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_arrayLikeToArray(arr, len) {\n  if (len == null || len > arr.length) len = arr.length;\n\n  for (var i = 0, arr2 = new Array(len); i < len; i++) {\n    arr2[i] = arr[i];\n  }\n\n  return arr2;\n}\n\nmodule.exports = _arrayLikeToArray;","function _arrayWithHoles(arr) {\n  if (Array.isArray(arr)) return arr;\n}\n\nmodule.exports = _arrayWithHoles;","var arrayLikeToArray = require(\"./arrayLikeToArray\");\n\nfunction _arrayWithoutHoles(arr) {\n  if (Array.isArray(arr)) return arrayLikeToArray(arr);\n}\n\nmodule.exports = _arrayWithoutHoles;","function _assertThisInitialized(self) {\n  if (self === void 0) {\n    throw new ReferenceError(\"this hasn't been initialised - super() hasn't been called\");\n  }\n\n  return self;\n}\n\nmodule.exports = _assertThisInitialized;","function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) {\n  try {\n    var info = gen[key](arg);\n    var value = info.value;\n  } catch (error) {\n    reject(error);\n    return;\n  }\n\n  if (info.done) {\n    resolve(value);\n  } else {\n    Promise.resolve(value).then(_next, _throw);\n  }\n}\n\nfunction _asyncToGenerator(fn) {\n  return function () {\n    var self = this,\n        args = arguments;\n    return new Promise(function (resolve, reject) {\n      var gen = fn.apply(self, args);\n\n      function _next(value) {\n        asyncGeneratorStep(gen, resolve, reject, _next, _throw, \"next\", value);\n      }\n\n      function _throw(err) {\n        asyncGeneratorStep(gen, resolve, reject, _next, _throw, \"throw\", err);\n      }\n\n      _next(undefined);\n    });\n  };\n}\n\nmodule.exports = _asyncToGenerator;","function _classCallCheck(instance, Constructor) {\n  if (!(instance instanceof Constructor)) {\n    throw new TypeError(\"Cannot call a class as a function\");\n  }\n}\n\nmodule.exports = _classCallCheck;","var setPrototypeOf = require(\"./setPrototypeOf\");\n\nvar isNativeReflectConstruct = require(\"./isNativeReflectConstruct\");\n\nfunction _construct(Parent, args, Class) {\n  if (isNativeReflectConstruct()) {\n    module.exports = _construct = Reflect.construct;\n  } else {\n    module.exports = _construct = function _construct(Parent, args, Class) {\n      var a = [null];\n      a.push.apply(a, args);\n      var Constructor = Function.bind.apply(Parent, a);\n      var instance = new Constructor();\n      if (Class) setPrototypeOf(instance, Class.prototype);\n      return instance;\n    };\n  }\n\n  return _construct.apply(null, arguments);\n}\n\nmodule.exports = _construct;","function _defineProperties(target, props) {\n  for (var i = 0; i < props.length; i++) {\n    var descriptor = props[i];\n    descriptor.enumerable = descriptor.enumerable || false;\n    descriptor.configurable = true;\n    if (\"value\" in descriptor) descriptor.writable = true;\n    Object.defineProperty(target, descriptor.key, descriptor);\n  }\n}\n\nfunction _createClass(Constructor, protoProps, staticProps) {\n  if (protoProps) _defineProperties(Constructor.prototype, protoProps);\n  if (staticProps) _defineProperties(Constructor, staticProps);\n  return Constructor;\n}\n\nmodule.exports = _createClass;","function _getPrototypeOf(o) {\n  module.exports = _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) {\n    return o.__proto__ || Object.getPrototypeOf(o);\n  };\n  return _getPrototypeOf(o);\n}\n\nmodule.exports = _getPrototypeOf;","var setPrototypeOf = require(\"./setPrototypeOf\");\n\nfunction _inherits(subClass, superClass) {\n  if (typeof superClass !== \"function\" && superClass !== null) {\n    throw new TypeError(\"Super expression must either be null or a function\");\n  }\n\n  subClass.prototype = Object.create(superClass && superClass.prototype, {\n    constructor: {\n      value: subClass,\n      writable: true,\n      configurable: true\n    }\n  });\n  if (superClass) setPrototypeOf(subClass, superClass);\n}\n\nmodule.exports = _inherits;","function _isNativeFunction(fn) {\n  return Function.toString.call(fn).indexOf(\"[native code]\") !== -1;\n}\n\nmodule.exports = _isNativeFunction;","function _isNativeReflectConstruct() {\n  if (typeof Reflect === \"undefined\" || !Reflect.construct) return false;\n  if (Reflect.construct.sham) return false;\n  if (typeof Proxy === \"function\") return true;\n\n  try {\n    Date.prototype.toString.call(Reflect.construct(Date, [], function () {}));\n    return true;\n  } catch (e) {\n    return false;\n  }\n}\n\nmodule.exports = _isNativeReflectConstruct;","function _iterableToArray(iter) {\n  if (typeof Symbol !== \"undefined\" && Symbol.iterator in Object(iter)) return Array.from(iter);\n}\n\nmodule.exports = _iterableToArray;","function _iterableToArrayLimit(arr, i) {\n  if (typeof Symbol === \"undefined\" || !(Symbol.iterator in Object(arr))) return;\n  var _arr = [];\n  var _n = true;\n  var _d = false;\n  var _e = undefined;\n\n  try {\n    for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {\n      _arr.push(_s.value);\n\n      if (i && _arr.length === i) break;\n    }\n  } catch (err) {\n    _d = true;\n    _e = err;\n  } finally {\n    try {\n      if (!_n && _i[\"return\"] != null) _i[\"return\"]();\n    } finally {\n      if (_d) throw _e;\n    }\n  }\n\n  return _arr;\n}\n\nmodule.exports = _iterableToArrayLimit;","function _nonIterableRest() {\n  throw new TypeError(\"Invalid attempt to destructure non-iterable instance.\\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.\");\n}\n\nmodule.exports = _nonIterableRest;","function _nonIterableSpread() {\n  throw new TypeError(\"Invalid attempt to spread non-iterable instance.\\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.\");\n}\n\nmodule.exports = _nonIterableSpread;","var _typeof = require(\"../helpers/typeof\");\n\nvar assertThisInitialized = require(\"./assertThisInitialized\");\n\nfunction _possibleConstructorReturn(self, call) {\n  if (call && (_typeof(call) === \"object\" || typeof call === \"function\")) {\n    return call;\n  }\n\n  return assertThisInitialized(self);\n}\n\nmodule.exports = _possibleConstructorReturn;","function _setPrototypeOf(o, p) {\n  module.exports = _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) {\n    o.__proto__ = p;\n    return o;\n  };\n\n  return _setPrototypeOf(o, p);\n}\n\nmodule.exports = _setPrototypeOf;","var arrayWithHoles = require(\"./arrayWithHoles\");\n\nvar iterableToArrayLimit = require(\"./iterableToArrayLimit\");\n\nvar unsupportedIterableToArray = require(\"./unsupportedIterableToArray\");\n\nvar nonIterableRest = require(\"./nonIterableRest\");\n\nfunction _slicedToArray(arr, i) {\n  return arrayWithHoles(arr) || iterableToArrayLimit(arr, i) || unsupportedIterableToArray(arr, i) || nonIterableRest();\n}\n\nmodule.exports = _slicedToArray;","var arrayWithoutHoles = require(\"./arrayWithoutHoles\");\n\nvar iterableToArray = require(\"./iterableToArray\");\n\nvar unsupportedIterableToArray = require(\"./unsupportedIterableToArray\");\n\nvar nonIterableSpread = require(\"./nonIterableSpread\");\n\nfunction _toConsumableArray(arr) {\n  return arrayWithoutHoles(arr) || iterableToArray(arr) || unsupportedIterableToArray(arr) || nonIterableSpread();\n}\n\nmodule.exports = _toConsumableArray;","function _typeof(obj) {\n  \"@babel/helpers - typeof\";\n\n  if (typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\") {\n    module.exports = _typeof = function _typeof(obj) {\n      return typeof obj;\n    };\n  } else {\n    module.exports = _typeof = function _typeof(obj) {\n      return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj;\n    };\n  }\n\n  return _typeof(obj);\n}\n\nmodule.exports = _typeof;","var arrayLikeToArray = require(\"./arrayLikeToArray\");\n\nfunction _unsupportedIterableToArray(o, minLen) {\n  if (!o) return;\n  if (typeof o === \"string\") return arrayLikeToArray(o, minLen);\n  var n = Object.prototype.toString.call(o).slice(8, -1);\n  if (n === \"Object\" && o.constructor) n = o.constructor.name;\n  if (n === \"Map\" || n === \"Set\") return Array.from(o);\n  if (n === \"Arguments\" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return arrayLikeToArray(o, minLen);\n}\n\nmodule.exports = _unsupportedIterableToArray;","var getPrototypeOf = require(\"./getPrototypeOf\");\n\nvar setPrototypeOf = require(\"./setPrototypeOf\");\n\nvar isNativeFunction = require(\"./isNativeFunction\");\n\nvar construct = require(\"./construct\");\n\nfunction _wrapNativeSuper(Class) {\n  var _cache = typeof Map === \"function\" ? new Map() : undefined;\n\n  module.exports = _wrapNativeSuper = function _wrapNativeSuper(Class) {\n    if (Class === null || !isNativeFunction(Class)) return Class;\n\n    if (typeof Class !== \"function\") {\n      throw new TypeError(\"Super expression must either be null or a function\");\n    }\n\n    if (typeof _cache !== \"undefined\") {\n      if (_cache.has(Class)) return _cache.get(Class);\n\n      _cache.set(Class, Wrapper);\n    }\n\n    function Wrapper() {\n      return construct(Class, arguments, getPrototypeOf(this).constructor);\n    }\n\n    Wrapper.prototype = Object.create(Class.prototype, {\n      constructor: {\n        value: Wrapper,\n        enumerable: false,\n        writable: true,\n        configurable: true\n      }\n    });\n    return setPrototypeOf(Wrapper, Class);\n  };\n\n  return _wrapNativeSuper(Class);\n}\n\nmodule.exports = _wrapNativeSuper;","module.exports = require(\"regenerator-runtime\");\n","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n\n// This implementation of {@link TokenStream} loads tokens from a\n// {@link TokenSource} on-demand, and places the tokens in a buffer to provide\n// access to any previous token by index.\n//\n// <p>\n// This token stream ignores the value of {@link Token//getChannel}. If your\n// parser requires the token stream filter tokens to only those on a particular\n// channel, such as {@link Token//DEFAULT_CHANNEL} or\n// {@link Token//HIDDEN_CHANNEL}, use a filtering token stream such a\n// {@link CommonTokenStream}.</p>\n\nvar Token = require('./Token').Token;\nvar Lexer = require('./Lexer').Lexer;\nvar Interval = require('./IntervalSet').Interval;\n\n// this is just to keep meaningful parameter types to Parser\nfunction TokenStream() {\n\treturn this;\n}\n\nfunction BufferedTokenStream(tokenSource) {\n\n\tTokenStream.call(this);\n\t// The {@link TokenSource} from which tokens for this stream are fetched.\n\tthis.tokenSource = tokenSource;\n\n\t// A collection of all tokens fetched from the token source. The list is\n\t// considered a complete view of the input once {@link //fetchedEOF} is set\n\t// to {@code true}.\n\tthis.tokens = [];\n\n\t// The index into {@link //tokens} of the current token (next token to\n\t// {@link //consume}). {@link //tokens}{@code [}{@link //p}{@code ]} should\n\t// be\n\t// {@link //LT LT(1)}.\n\t//\n\t// <p>This field is set to -1 when the stream is first constructed or when\n\t// {@link //setTokenSource} is called, indicating that the first token has\n\t// not yet been fetched from the token source. For additional information,\n\t// see the documentation of {@link IntStream} for a description of\n\t// Initializing Methods.</p>\n\tthis.index = -1;\n\n\t// Indicates whether the {@link Token//EOF} token has been fetched from\n\t// {@link //tokenSource} and added to {@link //tokens}. This field improves\n\t// performance for the following cases:\n\t//\n\t// <ul>\n\t// <li>{@link //consume}: The lookahead check in {@link //consume} to\n\t// prevent\n\t// consuming the EOF symbol is optimized by checking the values of\n\t// {@link //fetchedEOF} and {@link //p} instead of calling {@link\n\t// //LA}.</li>\n\t// <li>{@link //fetch}: The check to prevent adding multiple EOF symbols\n\t// into\n\t// {@link //tokens} is trivial with this field.</li>\n\t// <ul>\n\tthis.fetchedEOF = false;\n\treturn this;\n}\n\nBufferedTokenStream.prototype = Object.create(TokenStream.prototype);\nBufferedTokenStream.prototype.constructor = BufferedTokenStream;\n\nBufferedTokenStream.prototype.mark = function() {\n\treturn 0;\n};\n\nBufferedTokenStream.prototype.release = function(marker) {\n\t// no resources to release\n};\n\nBufferedTokenStream.prototype.reset = function() {\n\tthis.seek(0);\n};\n\nBufferedTokenStream.prototype.seek = function(index) {\n\tthis.lazyInit();\n\tthis.index = this.adjustSeekIndex(index);\n};\n\nBufferedTokenStream.prototype.get = function(index) {\n\tthis.lazyInit();\n\treturn this.tokens[index];\n};\n\nBufferedTokenStream.prototype.consume = function() {\n\tvar skipEofCheck = false;\n\tif (this.index >= 0) {\n\t\tif (this.fetchedEOF) {\n\t\t\t// the last token in tokens is EOF. skip check if p indexes any\n\t\t\t// fetched token except the last.\n\t\t\tskipEofCheck = this.index < this.tokens.length - 1;\n\t\t} else {\n\t\t\t// no EOF token in tokens. skip check if p indexes a fetched token.\n\t\t\tskipEofCheck = this.index < this.tokens.length;\n\t\t}\n\t} else {\n\t\t// not yet initialized\n\t\tskipEofCheck = false;\n\t}\n\tif (!skipEofCheck && this.LA(1) === Token.EOF) {\n\t\tthrow \"cannot consume EOF\";\n\t}\n\tif (this.sync(this.index + 1)) {\n\t\tthis.index = this.adjustSeekIndex(this.index + 1);\n\t}\n};\n\n// Make sure index {@code i} in tokens has a token.\n//\n// @return {@code true} if a token is located at index {@code i}, otherwise\n// {@code false}.\n// @see //get(int i)\n// /\nBufferedTokenStream.prototype.sync = function(i) {\n\tvar n = i - this.tokens.length + 1; // how many more elements we need?\n\tif (n > 0) {\n\t\tvar fetched = this.fetch(n);\n\t\treturn fetched >= n;\n\t}\n\treturn true;\n};\n\n// Add {@code n} elements to buffer.\n//\n// @return The actual number of elements added to the buffer.\n// /\nBufferedTokenStream.prototype.fetch = function(n) {\n\tif (this.fetchedEOF) {\n\t\treturn 0;\n\t}\n\tfor (var i = 0; i < n; i++) {\n\t\tvar t = this.tokenSource.nextToken();\n\t\tt.tokenIndex = this.tokens.length;\n\t\tthis.tokens.push(t);\n\t\tif (t.type === Token.EOF) {\n\t\t\tthis.fetchedEOF = true;\n\t\t\treturn i + 1;\n\t\t}\n\t}\n\treturn n;\n};\n\n// Get all tokens from start..stop inclusively///\nBufferedTokenStream.prototype.getTokens = function(start, stop, types) {\n\tif (types === undefined) {\n\t\ttypes = null;\n\t}\n\tif (start < 0 || stop < 0) {\n\t\treturn null;\n\t}\n\tthis.lazyInit();\n\tvar subset = [];\n\tif (stop >= this.tokens.length) {\n\t\tstop = this.tokens.length - 1;\n\t}\n\tfor (var i = start; i < stop; i++) {\n\t\tvar t = this.tokens[i];\n\t\tif (t.type === Token.EOF) {\n\t\t\tbreak;\n\t\t}\n\t\tif (types === null || types.contains(t.type)) {\n\t\t\tsubset.push(t);\n\t\t}\n\t}\n\treturn subset;\n};\n\nBufferedTokenStream.prototype.LA = function(i) {\n\treturn this.LT(i).type;\n};\n\nBufferedTokenStream.prototype.LB = function(k) {\n\tif (this.index - k < 0) {\n\t\treturn null;\n\t}\n\treturn this.tokens[this.index - k];\n};\n\nBufferedTokenStream.prototype.LT = function(k) {\n\tthis.lazyInit();\n\tif (k === 0) {\n\t\treturn null;\n\t}\n\tif (k < 0) {\n\t\treturn this.LB(-k);\n\t}\n\tvar i = this.index + k - 1;\n\tthis.sync(i);\n\tif (i >= this.tokens.length) { // return EOF token\n\t\t// EOF must be last token\n\t\treturn this.tokens[this.tokens.length - 1];\n\t}\n\treturn this.tokens[i];\n};\n\n// Allowed derived classes to modify the behavior of operations which change\n// the current stream position by adjusting the target token index of a seek\n// operation. The default implementation simply returns {@code i}. If an\n// exception is thrown in this method, the current stream index should not be\n// changed.\n//\n// <p>For example, {@link CommonTokenStream} overrides this method to ensure\n// that\n// the seek target is always an on-channel token.</p>\n//\n// @param i The target token index.\n// @return The adjusted target token index.\n\nBufferedTokenStream.prototype.adjustSeekIndex = function(i) {\n\treturn i;\n};\n\nBufferedTokenStream.prototype.lazyInit = function() {\n\tif (this.index === -1) {\n\t\tthis.setup();\n\t}\n};\n\nBufferedTokenStream.prototype.setup = function() {\n\tthis.sync(0);\n\tthis.index = this.adjustSeekIndex(0);\n};\n\n// Reset this token stream by setting its token source.///\nBufferedTokenStream.prototype.setTokenSource = function(tokenSource) {\n\tthis.tokenSource = tokenSource;\n\tthis.tokens = [];\n\tthis.index = -1;\n\tthis.fetchedEOF = false;\n};\n\n\n// Given a starting index, return the index of the next token on channel.\n// Return i if tokens[i] is on channel. Return -1 if there are no tokens\n// on channel between i and EOF.\n// /\nBufferedTokenStream.prototype.nextTokenOnChannel = function(i, channel) {\n\tthis.sync(i);\n\tif (i >= this.tokens.length) {\n\t\treturn -1;\n\t}\n\tvar token = this.tokens[i];\n\twhile (token.channel !== this.channel) {\n\t\tif (token.type === Token.EOF) {\n\t\t\treturn -1;\n\t\t}\n\t\ti += 1;\n\t\tthis.sync(i);\n\t\ttoken = this.tokens[i];\n\t}\n\treturn i;\n};\n\n// Given a starting index, return the index of the previous token on channel.\n// Return i if tokens[i] is on channel. Return -1 if there are no tokens\n// on channel between i and 0.\nBufferedTokenStream.prototype.previousTokenOnChannel = function(i, channel) {\n\twhile (i >= 0 && this.tokens[i].channel !== channel) {\n\t\ti -= 1;\n\t}\n\treturn i;\n};\n\n// Collect all tokens on specified channel to the right of\n// the current token up until we see a token on DEFAULT_TOKEN_CHANNEL or\n// EOF. If channel is -1, find any non default channel token.\nBufferedTokenStream.prototype.getHiddenTokensToRight = function(tokenIndex,\n\t\tchannel) {\n\tif (channel === undefined) {\n\t\tchannel = -1;\n\t}\n\tthis.lazyInit();\n\tif (tokenIndex < 0 || tokenIndex >= this.tokens.length) {\n\t\tthrow \"\" + tokenIndex + \" not in 0..\" + this.tokens.length - 1;\n\t}\n\tvar nextOnChannel = this.nextTokenOnChannel(tokenIndex + 1, Lexer.DEFAULT_TOKEN_CHANNEL);\n\tvar from_ = tokenIndex + 1;\n\t// if none onchannel to right, nextOnChannel=-1 so set to = last token\n\tvar to = nextOnChannel === -1 ? this.tokens.length - 1 : nextOnChannel;\n\treturn this.filterForChannel(from_, to, channel);\n};\n\n// Collect all tokens on specified channel to the left of\n// the current token up until we see a token on DEFAULT_TOKEN_CHANNEL.\n// If channel is -1, find any non default channel token.\nBufferedTokenStream.prototype.getHiddenTokensToLeft = function(tokenIndex,\n\t\tchannel) {\n\tif (channel === undefined) {\n\t\tchannel = -1;\n\t}\n\tthis.lazyInit();\n\tif (tokenIndex < 0 || tokenIndex >= this.tokens.length) {\n\t\tthrow \"\" + tokenIndex + \" not in 0..\" + this.tokens.length - 1;\n\t}\n\tvar prevOnChannel = this.previousTokenOnChannel(tokenIndex - 1, Lexer.DEFAULT_TOKEN_CHANNEL);\n\tif (prevOnChannel === tokenIndex - 1) {\n\t\treturn null;\n\t}\n\t// if none on channel to left, prevOnChannel=-1 then from=0\n\tvar from_ = prevOnChannel + 1;\n\tvar to = tokenIndex - 1;\n\treturn this.filterForChannel(from_, to, channel);\n};\n\nBufferedTokenStream.prototype.filterForChannel = function(left, right, channel) {\n\tvar hidden = [];\n\tfor (var i = left; i < right + 1; i++) {\n\t\tvar t = this.tokens[i];\n\t\tif (channel === -1) {\n\t\t\tif (t.channel !== Lexer.DEFAULT_TOKEN_CHANNEL) {\n\t\t\t\thidden.push(t);\n\t\t\t}\n\t\t} else if (t.channel === channel) {\n\t\t\thidden.push(t);\n\t\t}\n\t}\n\tif (hidden.length === 0) {\n\t\treturn null;\n\t}\n\treturn hidden;\n};\n\nBufferedTokenStream.prototype.getSourceName = function() {\n\treturn this.tokenSource.getSourceName();\n};\n\n// Get the text of all tokens in this buffer.///\nBufferedTokenStream.prototype.getText = function(interval) {\n\tthis.lazyInit();\n\tthis.fill();\n\tif (interval === undefined || interval === null) {\n\t\tinterval = new Interval(0, this.tokens.length - 1);\n\t}\n\tvar start = interval.start;\n\tif (start instanceof Token) {\n\t\tstart = start.tokenIndex;\n\t}\n\tvar stop = interval.stop;\n\tif (stop instanceof Token) {\n\t\tstop = stop.tokenIndex;\n\t}\n\tif (start === null || stop === null || start < 0 || stop < 0) {\n\t\treturn \"\";\n\t}\n\tif (stop >= this.tokens.length) {\n\t\tstop = this.tokens.length - 1;\n\t}\n\tvar s = \"\";\n\tfor (var i = start; i < stop + 1; i++) {\n\t\tvar t = this.tokens[i];\n\t\tif (t.type === Token.EOF) {\n\t\t\tbreak;\n\t\t}\n\t\ts = s + t.text;\n\t}\n\treturn s;\n};\n\n// Get all tokens from lexer until EOF///\nBufferedTokenStream.prototype.fill = function() {\n\tthis.lazyInit();\n\twhile (this.fetch(1000) === 1000) {\n\t\tcontinue;\n\t}\n};\n\nexports.BufferedTokenStream = BufferedTokenStream;\n","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n//\n\nvar InputStream = require('./InputStream').InputStream;\n\nvar isNodeJs = typeof window === 'undefined' && typeof importScripts === 'undefined';\nvar fs = isNodeJs ? require(\"fs\") : null;\n\n// Utility functions to create InputStreams from various sources.\n//\n// All returned InputStreams support the full range of Unicode\n// up to U+10FFFF (the default behavior of InputStream only supports\n// code points up to U+FFFF).\nvar CharStreams = {\n  // Creates an InputStream from a string.\n  fromString: function(str) {\n    return new InputStream(str, true);\n  },\n\n  // Asynchronously creates an InputStream from a blob given the\n  // encoding of the bytes in that blob (defaults to 'utf8' if\n  // encoding is null).\n  //\n  // Invokes onLoad(result) on success, onError(error) on\n  // failure.\n  fromBlob: function(blob, encoding, onLoad, onError) {\n    var reader = FileReader();\n    reader.onload = function(e) {\n      var is = new InputStream(e.target.result, true);\n      onLoad(is);\n    };\n    reader.onerror = onError;\n    reader.readAsText(blob, encoding);\n  },\n\n  // Creates an InputStream from a Buffer given the\n  // encoding of the bytes in that buffer (defaults to 'utf8' if\n  // encoding is null).\n  fromBuffer: function(buffer, encoding) {\n    return new InputStream(buffer.toString(encoding), true);\n  },\n\n  // Asynchronously creates an InputStream from a file on disk given\n  // the encoding of the bytes in that file (defaults to 'utf8' if\n  // encoding is null).\n  //\n  // Invokes callback(error, result) on completion.\n  fromPath: function(path, encoding, callback) {\n    fs.readFile(path, encoding, function(err, data) {\n      var is = null;\n      if (data !== null) {\n        is = new InputStream(data, true);\n      }\n      callback(err, is);\n    });\n  },\n\n  // Synchronously creates an InputStream given a path to a file\n  // on disk and the encoding of the bytes in that file (defaults to\n  // 'utf8' if encoding is null).\n  fromPathSync: function(path, encoding) {\n    var data = fs.readFileSync(path, encoding);\n    return new InputStream(data, true);\n  }\n};\n\nexports.CharStreams = CharStreams;\n","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n//\n\n//\n// This default implementation of {@link TokenFactory} creates\n// {@link CommonToken} objects.\n//\n\nvar CommonToken = require('./Token').CommonToken;\n\nfunction TokenFactory() {\n\treturn this;\n}\n\nfunction CommonTokenFactory(copyText) {\n\tTokenFactory.call(this);\n    // Indicates whether {@link CommonToken//setText} should be called after\n    // constructing tokens to explicitly set the text. This is useful for cases\n    // where the input stream might not be able to provide arbitrary substrings\n    // of text from the input after the lexer creates a token (e.g. the\n    // implementation of {@link CharStream//getText} in\n    // {@link UnbufferedCharStream} throws an\n    // {@link UnsupportedOperationException}). Explicitly setting the token text\n    // allows {@link Token//getText} to be called at any time regardless of the\n    // input stream implementation.\n    //\n    // <p>\n    // The default value is {@code false} to avoid the performance and memory\n    // overhead of copying text for every token unless explicitly requested.</p>\n    //\n    this.copyText = copyText===undefined ? false : copyText;\n\treturn this;\n}\n\nCommonTokenFactory.prototype = Object.create(TokenFactory.prototype);\nCommonTokenFactory.prototype.constructor = CommonTokenFactory;\n\n//\n// The default {@link CommonTokenFactory} instance.\n//\n// <p>\n// This token factory does not explicitly copy token text when constructing\n// tokens.</p>\n//\nCommonTokenFactory.DEFAULT = new CommonTokenFactory();\n\nCommonTokenFactory.prototype.create = function(source, type, text, channel, start, stop, line, column) {\n    var t = new CommonToken(source, type, channel, start, stop);\n    t.line = line;\n    t.column = column;\n    if (text !==null) {\n        t.text = text;\n    } else if (this.copyText && source[1] !==null) {\n        t.text = source[1].getText(start,stop);\n    }\n    return t;\n};\n\nCommonTokenFactory.prototype.createThin = function(type, text) {\n    var t = new CommonToken(null, type);\n    t.text = text;\n    return t;\n};\n\nexports.CommonTokenFactory = CommonTokenFactory;\n","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n///\n\n//\n// This class extends {@link BufferedTokenStream} with functionality to filter\n// token streams to tokens on a particular channel (tokens where\n// {@link Token//getChannel} returns a particular value).\n//\n// <p>\n// This token stream provides access to all tokens by index or when calling\n// methods like {@link //getText}. The channel filtering is only used for code\n// accessing tokens via the lookahead methods {@link //LA}, {@link //LT}, and\n// {@link //LB}.</p>\n//\n// <p>\n// By default, tokens are placed on the default channel\n// ({@link Token//DEFAULT_CHANNEL}), but may be reassigned by using the\n// {@code ->channel(HIDDEN)} lexer command, or by using an embedded action to\n// call {@link Lexer//setChannel}.\n// </p>\n//\n// <p>\n// Note: lexer rules which use the {@code ->skip} lexer command or call\n// {@link Lexer//skip} do not produce tokens at all, so input text matched by\n// such a rule will not be available as part of the token stream, regardless of\n// channel.</p>\n///\n\nvar Token = require('./Token').Token;\nvar BufferedTokenStream = require('./BufferedTokenStream').BufferedTokenStream;\n\nfunction CommonTokenStream(lexer, channel) {\n\tBufferedTokenStream.call(this, lexer);\n    this.channel = channel===undefined ? Token.DEFAULT_CHANNEL : channel;\n    return this;\n}\n\nCommonTokenStream.prototype = Object.create(BufferedTokenStream.prototype);\nCommonTokenStream.prototype.constructor = CommonTokenStream;\n\nCommonTokenStream.prototype.adjustSeekIndex = function(i) {\n    return this.nextTokenOnChannel(i, this.channel);\n};\n\nCommonTokenStream.prototype.LB = function(k) {\n    if (k===0 || this.index-k<0) {\n        return null;\n    }\n    var i = this.index;\n    var n = 1;\n    // find k good tokens looking backwards\n    while (n <= k) {\n        // skip off-channel tokens\n        i = this.previousTokenOnChannel(i - 1, this.channel);\n        n += 1;\n    }\n    if (i < 0) {\n        return null;\n    }\n    return this.tokens[i];\n};\n\nCommonTokenStream.prototype.LT = function(k) {\n    this.lazyInit();\n    if (k === 0) {\n        return null;\n    }\n    if (k < 0) {\n        return this.LB(-k);\n    }\n    var i = this.index;\n    var n = 1; // we know tokens[pos] is a good one\n    // find k good tokens\n    while (n < k) {\n        // skip off-channel tokens, but make sure to not look past EOF\n        if (this.sync(i + 1)) {\n            i = this.nextTokenOnChannel(i + 1, this.channel);\n        }\n        n += 1;\n    }\n    return this.tokens[i];\n};\n\n// Count EOF just once.///\nCommonTokenStream.prototype.getNumberOfOnChannelTokens = function() {\n    var n = 0;\n    this.fill();\n    for (var i =0; i< this.tokens.length;i++) {\n        var t = this.tokens[i];\n        if( t.channel===this.channel) {\n            n += 1;\n        }\n        if( t.type===Token.EOF) {\n            break;\n        }\n    }\n    return n;\n};\n\nexports.CommonTokenStream = CommonTokenStream;","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n//\n\n//\n//  This is an InputStream that is loaded from a file all at once\n//  when you construct the object.\n//\nvar InputStream = require('./InputStream').InputStream;\nvar isNodeJs = typeof window === 'undefined' && typeof importScripts === 'undefined';\nvar fs = isNodeJs ? require(\"fs\") : null;\n\nfunction FileStream(fileName, decodeToUnicodeCodePoints) {\n\tvar data = fs.readFileSync(fileName, \"utf8\");\n\tInputStream.call(this, data, decodeToUnicodeCodePoints);\n\tthis.fileName = fileName;\n\treturn this;\n}\n\nFileStream.prototype = Object.create(InputStream.prototype);\nFileStream.prototype.constructor = FileStream;\n\nexports.FileStream = FileStream;\n","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n//\n\nvar Token = require('./Token').Token;\nrequire('./polyfills/codepointat');\nrequire('./polyfills/fromcodepoint');\n\n// Vacuum all input from a string and then treat it like a buffer.\n\nfunction _loadString(stream) {\n\tstream._index = 0;\n\tstream.data = [];\n\tif (stream.decodeToUnicodeCodePoints) {\n\t\tfor (var i = 0; i < stream.strdata.length; ) {\n\t\t\tvar codePoint = stream.strdata.codePointAt(i);\n\t\t\tstream.data.push(codePoint);\n\t\t\ti += codePoint <= 0xFFFF ? 1 : 2;\n\t\t}\n\t} else {\n\t\tfor (var i = 0; i < stream.strdata.length; i++) {\n\t\t\tvar codeUnit = stream.strdata.charCodeAt(i);\n\t\t\tstream.data.push(codeUnit);\n\t\t}\n\t}\n\tstream._size = stream.data.length;\n}\n\n// If decodeToUnicodeCodePoints is true, the input is treated\n// as a series of Unicode code points.\n//\n// Otherwise, the input is treated as a series of 16-bit UTF-16 code\n// units.\nfunction InputStream(data, decodeToUnicodeCodePoints) {\n\tthis.name = \"<empty>\";\n\tthis.strdata = data;\n\tthis.decodeToUnicodeCodePoints = decodeToUnicodeCodePoints || false;\n\t_loadString(this);\n\treturn this;\n}\n\nObject.defineProperty(InputStream.prototype, \"index\", {\n\tget : function() {\n\t\treturn this._index;\n\t}\n});\n\nObject.defineProperty(InputStream.prototype, \"size\", {\n\tget : function() {\n\t\treturn this._size;\n\t}\n});\n\n// Reset the stream so that it's in the same state it was\n// when the object was created *except* the data array is not\n// touched.\n//\nInputStream.prototype.reset = function() {\n\tthis._index = 0;\n};\n\nInputStream.prototype.consume = function() {\n\tif (this._index >= this._size) {\n\t\t// assert this.LA(1) == Token.EOF\n\t\tthrow (\"cannot consume EOF\");\n\t}\n\tthis._index += 1;\n};\n\nInputStream.prototype.LA = function(offset) {\n\tif (offset === 0) {\n\t\treturn 0; // undefined\n\t}\n\tif (offset < 0) {\n\t\toffset += 1; // e.g., translate LA(-1) to use offset=0\n\t}\n\tvar pos = this._index + offset - 1;\n\tif (pos < 0 || pos >= this._size) { // invalid\n\t\treturn Token.EOF;\n\t}\n\treturn this.data[pos];\n};\n\nInputStream.prototype.LT = function(offset) {\n\treturn this.LA(offset);\n};\n\n// mark/release do nothing; we have entire buffer\nInputStream.prototype.mark = function() {\n\treturn -1;\n};\n\nInputStream.prototype.release = function(marker) {\n};\n\n// consume() ahead until p==_index; can't just set p=_index as we must\n// update line and column. If we seek backwards, just set p\n//\nInputStream.prototype.seek = function(_index) {\n\tif (_index <= this._index) {\n\t\tthis._index = _index; // just jump; don't update stream state (line,\n\t\t\t\t\t\t\t\t// ...)\n\t\treturn;\n\t}\n\t// seek forward\n\tthis._index = Math.min(_index, this._size);\n};\n\nInputStream.prototype.getText = function(start, stop) {\n\tif (stop >= this._size) {\n\t\tstop = this._size - 1;\n\t}\n\tif (start >= this._size) {\n\t\treturn \"\";\n\t} else {\n\t\tif (this.decodeToUnicodeCodePoints) {\n\t\t\tvar result = \"\";\n\t\t\tfor (var i = start; i <= stop; i++) {\n\t\t\t\tresult += String.fromCodePoint(this.data[i]);\n\t\t\t}\n\t\t\treturn result;\n\t\t} else {\n\t\t\treturn this.strdata.slice(start, stop + 1);\n\t\t}\n\t}\n};\n\nInputStream.prototype.toString = function() {\n\treturn this.strdata;\n};\n\nexports.InputStream = InputStream;\n","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n\n/*jslint smarttabs:true */\n\nvar Token = require('./Token').Token;\n\n/* stop is not included! */\nfunction Interval(start, stop) {\n\tthis.start = start;\n\tthis.stop = stop;\n\treturn this;\n}\n\nInterval.prototype.contains = function(item) {\n\treturn item >= this.start && item < this.stop;\n};\n\nInterval.prototype.toString = function() {\n\tif(this.start===this.stop-1) {\n\t\treturn this.start.toString();\n\t} else {\n\t\treturn this.start.toString() + \"..\" + (this.stop-1).toString();\n\t}\n};\n\n\nObject.defineProperty(Interval.prototype, \"length\", {\n\tget : function() {\n\t\treturn this.stop - this.start;\n\t}\n});\n\nfunction IntervalSet() {\n\tthis.intervals = null;\n\tthis.readOnly = false;\n}\n\nIntervalSet.prototype.first = function(v) {\n\tif (this.intervals === null || this.intervals.length===0) {\n\t\treturn Token.INVALID_TYPE;\n\t} else {\n\t\treturn this.intervals[0].start;\n\t}\n};\n\nIntervalSet.prototype.addOne = function(v) {\n\tthis.addInterval(new Interval(v, v + 1));\n};\n\nIntervalSet.prototype.addRange = function(l, h) {\n\tthis.addInterval(new Interval(l, h + 1));\n};\n\nIntervalSet.prototype.addInterval = function(v) {\n\tif (this.intervals === null) {\n\t\tthis.intervals = [];\n\t\tthis.intervals.push(v);\n\t} else {\n\t\t// find insert pos\n\t\tfor (var k = 0; k < this.intervals.length; k++) {\n\t\t\tvar i = this.intervals[k];\n\t\t\t// distinct range -> insert\n\t\t\tif (v.stop < i.start) {\n\t\t\t\tthis.intervals.splice(k, 0, v);\n\t\t\t\treturn;\n\t\t\t}\n\t\t\t// contiguous range -> adjust\n\t\t\telse if (v.stop === i.start) {\n\t\t\t\tthis.intervals[k].start = v.start;\n\t\t\t\treturn;\n\t\t\t}\n\t\t\t// overlapping range -> adjust and reduce\n\t\t\telse if (v.start <= i.stop) {\n\t\t\t\tthis.intervals[k] = new Interval(Math.min(i.start, v.start), Math.max(i.stop, v.stop));\n\t\t\t\tthis.reduce(k);\n\t\t\t\treturn;\n\t\t\t}\n\t\t}\n\t\t// greater than any existing\n\t\tthis.intervals.push(v);\n\t}\n};\n\nIntervalSet.prototype.addSet = function(other) {\n\tif (other.intervals !== null) {\n\t\tfor (var k = 0; k < other.intervals.length; k++) {\n\t\t\tvar i = other.intervals[k];\n\t\t\tthis.addInterval(new Interval(i.start, i.stop));\n\t\t}\n\t}\n\treturn this;\n};\n\nIntervalSet.prototype.reduce = function(k) {\n\t// only need to reduce if k is not the last\n\tif (k < this.intervalslength - 1) {\n\t\tvar l = this.intervals[k];\n\t\tvar r = this.intervals[k + 1];\n\t\t// if r contained in l\n\t\tif (l.stop >= r.stop) {\n\t\t\tthis.intervals.pop(k + 1);\n\t\t\tthis.reduce(k);\n\t\t} else if (l.stop >= r.start) {\n\t\t\tthis.intervals[k] = new Interval(l.start, r.stop);\n\t\t\tthis.intervals.pop(k + 1);\n\t\t}\n\t}\n};\n\nIntervalSet.prototype.complement = function(start, stop) {\n    var result = new IntervalSet();\n    result.addInterval(new Interval(start,stop+1));\n    for(var i=0; i<this.intervals.length; i++) {\n        result.removeRange(this.intervals[i]);\n    }\n    return result;\n};\n\nIntervalSet.prototype.contains = function(item) {\n\tif (this.intervals === null) {\n\t\treturn false;\n\t} else {\n\t\tfor (var k = 0; k < this.intervals.length; k++) {\n\t\t\tif(this.intervals[k].contains(item)) {\n\t\t\t\treturn true;\n\t\t\t}\n\t\t}\n\t\treturn false;\n\t}\n};\n\nObject.defineProperty(IntervalSet.prototype, \"length\", {\n\tget : function() {\n\t\tvar len = 0;\n\t\tthis.intervals.map(function(i) {len += i.length;});\n\t\treturn len;\n\t}\n});\n\nIntervalSet.prototype.removeRange = function(v) {\n    if(v.start===v.stop-1) {\n        this.removeOne(v.start);\n    } else if (this.intervals!==null) {\n        var k = 0;\n        for(var n=0; n<this.intervals.length; n++) {\n            var i = this.intervals[k];\n            // intervals are ordered\n            if (v.stop<=i.start) {\n                return;\n            }\n            // check for including range, split it\n            else if(v.start>i.start && v.stop<i.stop) {\n                this.intervals[k] = new Interval(i.start, v.start);\n                var x = new Interval(v.stop, i.stop);\n                this.intervals.splice(k, 0, x);\n                return;\n            }\n            // check for included range, remove it\n            else if(v.start<=i.start && v.stop>=i.stop) {\n                this.intervals.splice(k, 1);\n                k = k - 1; // need another pass\n            }\n            // check for lower boundary\n            else if(v.start<i.stop) {\n                this.intervals[k] = new Interval(i.start, v.start);\n            }\n            // check for upper boundary\n            else if(v.stop<i.stop) {\n                this.intervals[k] = new Interval(v.stop, i.stop);\n            }\n            k += 1;\n        }\n    }\n};\n\nIntervalSet.prototype.removeOne = function(v) {\n\tif (this.intervals !== null) {\n\t\tfor (var k = 0; k < this.intervals.length; k++) {\n\t\t\tvar i = this.intervals[k];\n\t\t\t// intervals is ordered\n\t\t\tif (v < i.start) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t\t// check for single value range\n\t\t\telse if (v === i.start && v === i.stop - 1) {\n\t\t\t\tthis.intervals.splice(k, 1);\n\t\t\t\treturn;\n\t\t\t}\n\t\t\t// check for lower boundary\n\t\t\telse if (v === i.start) {\n\t\t\t\tthis.intervals[k] = new Interval(i.start + 1, i.stop);\n\t\t\t\treturn;\n\t\t\t}\n\t\t\t// check for upper boundary\n\t\t\telse if (v === i.stop - 1) {\n\t\t\t\tthis.intervals[k] = new Interval(i.start, i.stop - 1);\n\t\t\t\treturn;\n\t\t\t}\n\t\t\t// split existing range\n\t\t\telse if (v < i.stop - 1) {\n\t\t\t\tvar x = new Interval(i.start, v);\n\t\t\t\ti.start = v + 1;\n\t\t\t\tthis.intervals.splice(k, 0, x);\n\t\t\t\treturn;\n\t\t\t}\n\t\t}\n\t}\n};\n\nIntervalSet.prototype.toString = function(literalNames, symbolicNames, elemsAreChar) {\n\tliteralNames = literalNames || null;\n\tsymbolicNames = symbolicNames || null;\n\telemsAreChar = elemsAreChar || false;\n\tif (this.intervals === null) {\n\t\treturn \"{}\";\n\t} else if(literalNames!==null || symbolicNames!==null) {\n\t\treturn this.toTokenString(literalNames, symbolicNames);\n\t} else if(elemsAreChar) {\n\t\treturn this.toCharString();\n\t} else {\n\t\treturn this.toIndexString();\n\t}\n};\n\nIntervalSet.prototype.toCharString = function() {\n\tvar names = [];\n\tfor (var i = 0; i < this.intervals.length; i++) {\n\t\tvar v = this.intervals[i];\n\t\tif(v.stop===v.start+1) {\n\t\t\tif ( v.start===Token.EOF ) {\n\t\t\t\tnames.push(\"<EOF>\");\n\t\t\t} else {\n\t\t\t\tnames.push(\"'\" + String.fromCharCode(v.start) + \"'\");\n\t\t\t}\n\t\t} else {\n\t\t\tnames.push(\"'\" + String.fromCharCode(v.start) + \"'..'\" + String.fromCharCode(v.stop-1) + \"'\");\n\t\t}\n\t}\n\tif (names.length > 1) {\n\t\treturn \"{\" + names.join(\", \") + \"}\";\n\t} else {\n\t\treturn names[0];\n\t}\n};\n\n\nIntervalSet.prototype.toIndexString = function() {\n\tvar names = [];\n\tfor (var i = 0; i < this.intervals.length; i++) {\n\t\tvar v = this.intervals[i];\n\t\tif(v.stop===v.start+1) {\n\t\t\tif ( v.start===Token.EOF ) {\n\t\t\t\tnames.push(\"<EOF>\");\n\t\t\t} else {\n\t\t\t\tnames.push(v.start.toString());\n\t\t\t}\n\t\t} else {\n\t\t\tnames.push(v.start.toString() + \"..\" + (v.stop-1).toString());\n\t\t}\n\t}\n\tif (names.length > 1) {\n\t\treturn \"{\" + names.join(\", \") + \"}\";\n\t} else {\n\t\treturn names[0];\n\t}\n};\n\n\nIntervalSet.prototype.toTokenString = function(literalNames, symbolicNames) {\n\tvar names = [];\n\tfor (var i = 0; i < this.intervals.length; i++) {\n\t\tvar v = this.intervals[i];\n\t\tfor (var j = v.start; j < v.stop; j++) {\n\t\t\tnames.push(this.elementName(literalNames, symbolicNames, j));\n\t\t}\n\t}\n\tif (names.length > 1) {\n\t\treturn \"{\" + names.join(\", \") + \"}\";\n\t} else {\n\t\treturn names[0];\n\t}\n};\n\nIntervalSet.prototype.elementName = function(literalNames, symbolicNames, a) {\n\tif (a === Token.EOF) {\n\t\treturn \"<EOF>\";\n\t} else if (a === Token.EPSILON) {\n\t\treturn \"<EPSILON>\";\n\t} else {\n\t\treturn literalNames[a] || symbolicNames[a];\n\t}\n};\n\nexports.Interval = Interval;\nexports.IntervalSet = IntervalSet;\n","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n///\n\nvar Set = require('./Utils').Set;\nvar BitSet = require('./Utils').BitSet;\nvar Token = require('./Token').Token;\nvar ATNConfig = require('./atn/ATNConfig').ATNConfig;\nvar Interval = require('./IntervalSet').Interval;\nvar IntervalSet = require('./IntervalSet').IntervalSet;\nvar RuleStopState = require('./atn/ATNState').RuleStopState;\nvar RuleTransition = require('./atn/Transition').RuleTransition;\nvar NotSetTransition = require('./atn/Transition').NotSetTransition;\nvar WildcardTransition = require('./atn/Transition').WildcardTransition;\nvar AbstractPredicateTransition = require('./atn/Transition').AbstractPredicateTransition;\n\nvar pc = require('./PredictionContext');\nvar predictionContextFromRuleContext = pc.predictionContextFromRuleContext;\nvar PredictionContext = pc.PredictionContext;\nvar SingletonPredictionContext = pc.SingletonPredictionContext;\n\nfunction LL1Analyzer (atn) {\n    this.atn = atn;\n}\n\n//* Special value added to the lookahead sets to indicate that we hit\n//  a predicate during analysis if {@code seeThruPreds==false}.\n///\nLL1Analyzer.HIT_PRED = Token.INVALID_TYPE;\n\n\n//*\n// Calculates the SLL(1) expected lookahead set for each outgoing transition\n// of an {@link ATNState}. The returned array has one element for each\n// outgoing transition in {@code s}. If the closure from transition\n// <em>i</em> leads to a semantic predicate before matching a symbol, the\n// element at index <em>i</em> of the result will be {@code null}.\n//\n// @param s the ATN state\n// @return the expected symbols for each outgoing transition of {@code s}.\n///\nLL1Analyzer.prototype.getDecisionLookahead = function(s) {\n    if (s === null) {\n        return null;\n    }\n    var count = s.transitions.length;\n    var look = [];\n    for(var alt=0; alt< count; alt++) {\n        look[alt] = new IntervalSet();\n        var lookBusy = new Set();\n        var seeThruPreds = false; // fail to get lookahead upon pred\n        this._LOOK(s.transition(alt).target, null, PredictionContext.EMPTY,\n              look[alt], lookBusy, new BitSet(), seeThruPreds, false);\n        // Wipe out lookahead for this alternative if we found nothing\n        // or we had a predicate when we !seeThruPreds\n        if (look[alt].length===0 || look[alt].contains(LL1Analyzer.HIT_PRED)) {\n            look[alt] = null;\n        }\n    }\n    return look;\n};\n\n//*\n// Compute set of tokens that can follow {@code s} in the ATN in the\n// specified {@code ctx}.\n//\n// <p>If {@code ctx} is {@code null} and the end of the rule containing\n// {@code s} is reached, {@link Token//EPSILON} is added to the result set.\n// If {@code ctx} is not {@code null} and the end of the outermost rule is\n// reached, {@link Token//EOF} is added to the result set.</p>\n//\n// @param s the ATN state\n// @param stopState the ATN state to stop at. This can be a\n// {@link BlockEndState} to detect epsilon paths through a closure.\n// @param ctx the complete parser context, or {@code null} if the context\n// should be ignored\n//\n// @return The set of tokens that can follow {@code s} in the ATN in the\n// specified {@code ctx}.\n///\nLL1Analyzer.prototype.LOOK = function(s, stopState, ctx) {\n    var r = new IntervalSet();\n    var seeThruPreds = true; // ignore preds; get all lookahead\n\tctx = ctx || null;\n    var lookContext = ctx!==null ? predictionContextFromRuleContext(s.atn, ctx) : null;\n    this._LOOK(s, stopState, lookContext, r, new Set(), new BitSet(), seeThruPreds, true);\n    return r;\n};\n\n//*\n// Compute set of tokens that can follow {@code s} in the ATN in the\n// specified {@code ctx}.\n//\n// <p>If {@code ctx} is {@code null} and {@code stopState} or the end of the\n// rule containing {@code s} is reached, {@link Token//EPSILON} is added to\n// the result set. If {@code ctx} is not {@code null} and {@code addEOF} is\n// {@code true} and {@code stopState} or the end of the outermost rule is\n// reached, {@link Token//EOF} is added to the result set.</p>\n//\n// @param s the ATN state.\n// @param stopState the ATN state to stop at. This can be a\n// {@link BlockEndState} to detect epsilon paths through a closure.\n// @param ctx The outer context, or {@code null} if the outer context should\n// not be used.\n// @param look The result lookahead set.\n// @param lookBusy A set used for preventing epsilon closures in the ATN\n// from causing a stack overflow. Outside code should pass\n// {@code new Set<ATNConfig>} for this argument.\n// @param calledRuleStack A set used for preventing left recursion in the\n// ATN from causing a stack overflow. Outside code should pass\n// {@code new BitSet()} for this argument.\n// @param seeThruPreds {@code true} to true semantic predicates as\n// implicitly {@code true} and \"see through them\", otherwise {@code false}\n// to treat semantic predicates as opaque and add {@link //HIT_PRED} to the\n// result if one is encountered.\n// @param addEOF Add {@link Token//EOF} to the result if the end of the\n// outermost context is reached. This parameter has no effect if {@code ctx}\n// is {@code null}.\n///\nLL1Analyzer.prototype._LOOK = function(s, stopState , ctx, look, lookBusy, calledRuleStack, seeThruPreds, addEOF) {\n    var c = new ATNConfig({state:s, alt:0, context: ctx}, null);\n    if (lookBusy.contains(c)) {\n        return;\n    }\n    lookBusy.add(c);\n    if (s === stopState) {\n        if (ctx ===null) {\n            look.addOne(Token.EPSILON);\n            return;\n        } else if (ctx.isEmpty() && addEOF) {\n            look.addOne(Token.EOF);\n            return;\n        }\n    }\n    if (s instanceof RuleStopState ) {\n        if (ctx ===null) {\n            look.addOne(Token.EPSILON);\n            return;\n        } else if (ctx.isEmpty() && addEOF) {\n            look.addOne(Token.EOF);\n            return;\n        }\n        if (ctx !== PredictionContext.EMPTY) {\n            // run thru all possible stack tops in ctx\n            for(var i=0; i<ctx.length; i++) {\n                var returnState = this.atn.states[ctx.getReturnState(i)];\n                var removed = calledRuleStack.contains(returnState.ruleIndex);\n                try {\n                    calledRuleStack.remove(returnState.ruleIndex);\n                    this._LOOK(returnState, stopState, ctx.getParent(i), look, lookBusy, calledRuleStack, seeThruPreds, addEOF);\n                } finally {\n                    if (removed) {\n                        calledRuleStack.add(returnState.ruleIndex);\n                    }\n                }\n            }\n            return;\n        }\n    }\n    for(var j=0; j<s.transitions.length; j++) {\n        var t = s.transitions[j];\n        if (t.constructor === RuleTransition) {\n            if (calledRuleStack.contains(t.target.ruleIndex)) {\n                continue;\n            }\n            var newContext = SingletonPredictionContext.create(ctx, t.followState.stateNumber);\n            try {\n                calledRuleStack.add(t.target.ruleIndex);\n                this._LOOK(t.target, stopState, newContext, look, lookBusy, calledRuleStack, seeThruPreds, addEOF);\n            } finally {\n                calledRuleStack.remove(t.target.ruleIndex);\n            }\n        } else if (t instanceof AbstractPredicateTransition ) {\n            if (seeThruPreds) {\n                this._LOOK(t.target, stopState, ctx, look, lookBusy, calledRuleStack, seeThruPreds, addEOF);\n            } else {\n                look.addOne(LL1Analyzer.HIT_PRED);\n            }\n        } else if( t.isEpsilon) {\n            this._LOOK(t.target, stopState, ctx, look, lookBusy, calledRuleStack, seeThruPreds, addEOF);\n        } else if (t.constructor === WildcardTransition) {\n            look.addRange( Token.MIN_USER_TOKEN_TYPE, this.atn.maxTokenType );\n        } else {\n            var set = t.label;\n            if (set !== null) {\n                if (t instanceof NotSetTransition) {\n                    set = set.complement(Token.MIN_USER_TOKEN_TYPE, this.atn.maxTokenType);\n                }\n                look.addSet(set);\n            }\n        }\n    }\n};\n\nexports.LL1Analyzer = LL1Analyzer;\n\n","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n///\n\n// A lexer is recognizer that draws input symbols from a character stream.\n//  lexer grammars result in a subclass of this object. A Lexer object\n//  uses simplified match() and error recovery mechanisms in the interest of speed.\n\nvar Token = require('./Token').Token;\nvar Recognizer = require('./Recognizer').Recognizer;\nvar CommonTokenFactory = require('./CommonTokenFactory').CommonTokenFactory;\nvar RecognitionException  = require('./error/Errors').RecognitionException;\nvar LexerNoViableAltException = require('./error/Errors').LexerNoViableAltException;\n\nfunction TokenSource() {\n\treturn this;\n}\n\nfunction Lexer(input) {\n\tRecognizer.call(this);\n\tthis._input = input;\n\tthis._factory = CommonTokenFactory.DEFAULT;\n\tthis._tokenFactorySourcePair = [ this, input ];\n\n\tthis._interp = null; // child classes must populate this\n\n\t// The goal of all lexer rules/methods is to create a token object.\n\t// this is an instance variable as multiple rules may collaborate to\n\t// create a single token. nextToken will return this object after\n\t// matching lexer rule(s). If you subclass to allow multiple token\n\t// emissions, then set this to the last token to be matched or\n\t// something nonnull so that the auto token emit mechanism will not\n\t// emit another token.\n\tthis._token = null;\n\n\t// What character index in the stream did the current token start at?\n\t// Needed, for example, to get the text for current token. Set at\n\t// the start of nextToken.\n\tthis._tokenStartCharIndex = -1;\n\n\t// The line on which the first character of the token resides///\n\tthis._tokenStartLine = -1;\n\n\t// The character position of first character within the line///\n\tthis._tokenStartColumn = -1;\n\n\t// Once we see EOF on char stream, next token will be EOF.\n\t// If you have DONE : EOF ; then you see DONE EOF.\n\tthis._hitEOF = false;\n\n\t// The channel number for the current token///\n\tthis._channel = Token.DEFAULT_CHANNEL;\n\n\t// The token type for the current token///\n\tthis._type = Token.INVALID_TYPE;\n\n\tthis._modeStack = [];\n\tthis._mode = Lexer.DEFAULT_MODE;\n\n\t// You can set the text for the current token to override what is in\n\t// the input char buffer. Use setText() or can set this instance var.\n\t// /\n\tthis._text = null;\n\n\treturn this;\n}\n\nLexer.prototype = Object.create(Recognizer.prototype);\nLexer.prototype.constructor = Lexer;\n\nLexer.DEFAULT_MODE = 0;\nLexer.MORE = -2;\nLexer.SKIP = -3;\n\nLexer.DEFAULT_TOKEN_CHANNEL = Token.DEFAULT_CHANNEL;\nLexer.HIDDEN = Token.HIDDEN_CHANNEL;\nLexer.MIN_CHAR_VALUE = 0x0000;\nLexer.MAX_CHAR_VALUE = 0x10FFFF;\n\nLexer.prototype.reset = function() {\n\t// wack Lexer state variables\n\tif (this._input !== null) {\n\t\tthis._input.seek(0); // rewind the input\n\t}\n\tthis._token = null;\n\tthis._type = Token.INVALID_TYPE;\n\tthis._channel = Token.DEFAULT_CHANNEL;\n\tthis._tokenStartCharIndex = -1;\n\tthis._tokenStartColumn = -1;\n\tthis._tokenStartLine = -1;\n\tthis._text = null;\n\n\tthis._hitEOF = false;\n\tthis._mode = Lexer.DEFAULT_MODE;\n\tthis._modeStack = [];\n\n\tthis._interp.reset();\n};\n\n// Return a token from this source; i.e., match a token on the char stream.\nLexer.prototype.nextToken = function() {\n\tif (this._input === null) {\n\t\tthrow \"nextToken requires a non-null input stream.\";\n\t}\n\n\t// Mark start location in char stream so unbuffered streams are\n\t// guaranteed at least have text of current token\n\tvar tokenStartMarker = this._input.mark();\n\ttry {\n\t\twhile (true) {\n\t\t\tif (this._hitEOF) {\n\t\t\t\tthis.emitEOF();\n\t\t\t\treturn this._token;\n\t\t\t}\n\t\t\tthis._token = null;\n\t\t\tthis._channel = Token.DEFAULT_CHANNEL;\n\t\t\tthis._tokenStartCharIndex = this._input.index;\n\t\t\tthis._tokenStartColumn = this._interp.column;\n\t\t\tthis._tokenStartLine = this._interp.line;\n\t\t\tthis._text = null;\n\t\t\tvar continueOuter = false;\n\t\t\twhile (true) {\n\t\t\t\tthis._type = Token.INVALID_TYPE;\n\t\t\t\tvar ttype = Lexer.SKIP;\n\t\t\t\ttry {\n\t\t\t\t\tttype = this._interp.match(this._input, this._mode);\n\t\t\t\t} catch (e) {\n\t\t\t\t    if(e instanceof RecognitionException) {\n                        this.notifyListeners(e); // report error\n                        this.recover(e);\n                    } else {\n                        console.log(e.stack);\n                        throw e;\n                    }\n\t\t\t\t}\n\t\t\t\tif (this._input.LA(1) === Token.EOF) {\n\t\t\t\t\tthis._hitEOF = true;\n\t\t\t\t}\n\t\t\t\tif (this._type === Token.INVALID_TYPE) {\n\t\t\t\t\tthis._type = ttype;\n\t\t\t\t}\n\t\t\t\tif (this._type === Lexer.SKIP) {\n\t\t\t\t\tcontinueOuter = true;\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t\tif (this._type !== Lexer.MORE) {\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t\tif (continueOuter) {\n\t\t\t\tcontinue;\n\t\t\t}\n\t\t\tif (this._token === null) {\n\t\t\t\tthis.emit();\n\t\t\t}\n\t\t\treturn this._token;\n\t\t}\n\t} finally {\n\t\t// make sure we release marker after match or\n\t\t// unbuffered char stream will keep buffering\n\t\tthis._input.release(tokenStartMarker);\n\t}\n};\n\n// Instruct the lexer to skip creating a token for current lexer rule\n// and look for another token. nextToken() knows to keep looking when\n// a lexer rule finishes with token set to SKIP_TOKEN. Recall that\n// if token==null at end of any token rule, it creates one for you\n// and emits it.\n// /\nLexer.prototype.skip = function() {\n\tthis._type = Lexer.SKIP;\n};\n\nLexer.prototype.more = function() {\n\tthis._type = Lexer.MORE;\n};\n\nLexer.prototype.mode = function(m) {\n\tthis._mode = m;\n};\n\nLexer.prototype.pushMode = function(m) {\n\tif (this._interp.debug) {\n\t\tconsole.log(\"pushMode \" + m);\n\t}\n\tthis._modeStack.push(this._mode);\n\tthis.mode(m);\n};\n\nLexer.prototype.popMode = function() {\n\tif (this._modeStack.length === 0) {\n\t\tthrow \"Empty Stack\";\n\t}\n\tif (this._interp.debug) {\n\t\tconsole.log(\"popMode back to \" + this._modeStack.slice(0, -1));\n\t}\n\tthis.mode(this._modeStack.pop());\n\treturn this._mode;\n};\n\n// Set the char stream and reset the lexer\nObject.defineProperty(Lexer.prototype, \"inputStream\", {\n\tget : function() {\n\t\treturn this._input;\n\t},\n\tset : function(input) {\n\t\tthis._input = null;\n\t\tthis._tokenFactorySourcePair = [ this, this._input ];\n\t\tthis.reset();\n\t\tthis._input = input;\n\t\tthis._tokenFactorySourcePair = [ this, this._input ];\n\t}\n});\n\nObject.defineProperty(Lexer.prototype, \"sourceName\", {\n\tget : function sourceName() {\n\t\treturn this._input.sourceName;\n\t}\n});\n\n// By default does not support multiple emits per nextToken invocation\n// for efficiency reasons. Subclass and override this method, nextToken,\n// and getToken (to push tokens into a list and pull from that list\n// rather than a single variable as this implementation does).\n// /\nLexer.prototype.emitToken = function(token) {\n\tthis._token = token;\n};\n\n// The standard method called to automatically emit a token at the\n// outermost lexical rule. The token object should point into the\n// char buffer start..stop. If there is a text override in 'text',\n// use that to set the token's text. Override this method to emit\n// custom Token objects or provide a new factory.\n// /\nLexer.prototype.emit = function() {\n\tvar t = this._factory.create(this._tokenFactorySourcePair, this._type,\n\t\t\tthis._text, this._channel, this._tokenStartCharIndex, this\n\t\t\t\t\t.getCharIndex() - 1, this._tokenStartLine,\n\t\t\tthis._tokenStartColumn);\n\tthis.emitToken(t);\n\treturn t;\n};\n\nLexer.prototype.emitEOF = function() {\n\tvar cpos = this.column;\n\tvar lpos = this.line;\n\tvar eof = this._factory.create(this._tokenFactorySourcePair, Token.EOF,\n\t\t\tnull, Token.DEFAULT_CHANNEL, this._input.index,\n\t\t\tthis._input.index - 1, lpos, cpos);\n\tthis.emitToken(eof);\n\treturn eof;\n};\n\nObject.defineProperty(Lexer.prototype, \"type\", {\n\tget : function() {\n\t\treturn this.type;\n\t},\n\tset : function(type) {\n\t\tthis._type = type;\n\t}\n});\n\nObject.defineProperty(Lexer.prototype, \"line\", {\n\tget : function() {\n\t\treturn this._interp.line;\n\t},\n\tset : function(line) {\n\t\tthis._interp.line = line;\n\t}\n});\n\nObject.defineProperty(Lexer.prototype, \"column\", {\n\tget : function() {\n\t\treturn this._interp.column;\n\t},\n\tset : function(column) {\n\t\tthis._interp.column = column;\n\t}\n});\n\n\n// What is the index of the current character of lookahead?///\nLexer.prototype.getCharIndex = function() {\n\treturn this._input.index;\n};\n\n// Return the text matched so far for the current token or any text override.\n//Set the complete text of this token; it wipes any previous changes to the text.\nObject.defineProperty(Lexer.prototype, \"text\", {\n\tget : function() {\n\t\tif (this._text !== null) {\n\t\t\treturn this._text;\n\t\t} else {\n\t\t\treturn this._interp.getText(this._input);\n\t\t}\n\t},\n\tset : function(text) {\n\t\tthis._text = text;\n\t}\n});\n// Return a list of all Token objects in input char stream.\n// Forces load of all tokens. Does not include EOF token.\n// /\nLexer.prototype.getAllTokens = function() {\n\tvar tokens = [];\n\tvar t = this.nextToken();\n\twhile (t.type !== Token.EOF) {\n\t\ttokens.push(t);\n\t\tt = this.nextToken();\n\t}\n\treturn tokens;\n};\n\nLexer.prototype.notifyListeners = function(e) {\n\tvar start = this._tokenStartCharIndex;\n\tvar stop = this._input.index;\n\tvar text = this._input.getText(start, stop);\n\tvar msg = \"token recognition error at: '\" + this.getErrorDisplay(text) + \"'\";\n\tvar listener = this.getErrorListenerDispatch();\n\tlistener.syntaxError(this, null, this._tokenStartLine,\n\t\t\tthis._tokenStartColumn, msg, e);\n};\n\nLexer.prototype.getErrorDisplay = function(s) {\n\tvar d = [];\n\tfor (var i = 0; i < s.length; i++) {\n\t\td.push(s[i]);\n\t}\n\treturn d.join('');\n};\n\nLexer.prototype.getErrorDisplayForChar = function(c) {\n\tif (c.charCodeAt(0) === Token.EOF) {\n\t\treturn \"<EOF>\";\n\t} else if (c === '\\n') {\n\t\treturn \"\\\\n\";\n\t} else if (c === '\\t') {\n\t\treturn \"\\\\t\";\n\t} else if (c === '\\r') {\n\t\treturn \"\\\\r\";\n\t} else {\n\t\treturn c;\n\t}\n};\n\nLexer.prototype.getCharErrorDisplay = function(c) {\n\treturn \"'\" + this.getErrorDisplayForChar(c) + \"'\";\n};\n\n// Lexers can normally match any char in it's vocabulary after matching\n// a token, so do the easy thing and just kill a character and hope\n// it all works out. You can instead use the rule invocation stack\n// to do sophisticated error recovery if you are in a fragment rule.\n// /\nLexer.prototype.recover = function(re) {\n\tif (this._input.LA(1) !== Token.EOF) {\n\t\tif (re instanceof LexerNoViableAltException) {\n\t\t\t// skip a char and try again\n\t\t\tthis._interp.consume(this._input);\n\t\t} else {\n\t\t\t// TODO: Do we lose character or line position information?\n\t\t\tthis._input.consume();\n\t\t}\n\t}\n};\n\nexports.Lexer = Lexer;\n","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n\nvar Token = require('./Token').Token;\nvar ParseTreeListener = require('./tree/Tree').ParseTreeListener;\nvar Recognizer = require('./Recognizer').Recognizer;\nvar DefaultErrorStrategy = require('./error/ErrorStrategy').DefaultErrorStrategy;\nvar ATNDeserializer = require('./atn/ATNDeserializer').ATNDeserializer;\nvar ATNDeserializationOptions = require('./atn/ATNDeserializationOptions').ATNDeserializationOptions;\nvar TerminalNode = require('./tree/Tree').TerminalNode;\nvar ErrorNode = require('./tree/Tree').ErrorNode;\n\nfunction TraceListener(parser) {\n\tParseTreeListener.call(this);\n    this.parser = parser;\n\treturn this;\n}\n\nTraceListener.prototype = Object.create(ParseTreeListener.prototype);\nTraceListener.prototype.constructor = TraceListener;\n\nTraceListener.prototype.enterEveryRule = function(ctx) {\n\tconsole.log(\"enter   \" + this.parser.ruleNames[ctx.ruleIndex] + \", LT(1)=\" + this.parser._input.LT(1).text);\n};\n\nTraceListener.prototype.visitTerminal = function( node) {\n\tconsole.log(\"consume \" + node.symbol + \" rule \" + this.parser.ruleNames[this.parser._ctx.ruleIndex]);\n};\n\nTraceListener.prototype.exitEveryRule = function(ctx) {\n\tconsole.log(\"exit    \" + this.parser.ruleNames[ctx.ruleIndex] + \", LT(1)=\" + this.parser._input.LT(1).text);\n};\n\n// this is all the parsing support code essentially; most of it is error\n// recovery stuff.//\nfunction Parser(input) {\n\tRecognizer.call(this);\n\t// The input stream.\n\tthis._input = null;\n\t// The error handling strategy for the parser. The default value is a new\n\t// instance of {@link DefaultErrorStrategy}.\n\tthis._errHandler = new DefaultErrorStrategy();\n\tthis._precedenceStack = [];\n\tthis._precedenceStack.push(0);\n\t// The {@link ParserRuleContext} object for the currently executing rule.\n\t// this is always non-null during the parsing process.\n\tthis._ctx = null;\n\t// Specifies whether or not the parser should construct a parse tree during\n\t// the parsing process. The default value is {@code true}.\n\tthis.buildParseTrees = true;\n\t// When {@link //setTrace}{@code (true)} is called, a reference to the\n\t// {@link TraceListener} is stored here so it can be easily removed in a\n\t// later call to {@link //setTrace}{@code (false)}. The listener itself is\n\t// implemented as a parser listener so this field is not directly used by\n\t// other parser methods.\n\tthis._tracer = null;\n\t// The list of {@link ParseTreeListener} listeners registered to receive\n\t// events during the parse.\n\tthis._parseListeners = null;\n\t// The number of syntax errors reported during parsing. this value is\n\t// incremented each time {@link //notifyErrorListeners} is called.\n\tthis._syntaxErrors = 0;\n\tthis.setInputStream(input);\n\treturn this;\n}\n\nParser.prototype = Object.create(Recognizer.prototype);\nParser.prototype.contructor = Parser;\n\n// this field maps from the serialized ATN string to the deserialized {@link\n// ATN} with\n// bypass alternatives.\n//\n// @see ATNDeserializationOptions//isGenerateRuleBypassTransitions()\n//\nParser.bypassAltsAtnCache = {};\n\n// reset the parser's state//\nParser.prototype.reset = function() {\n\tif (this._input !== null) {\n\t\tthis._input.seek(0);\n\t}\n\tthis._errHandler.reset(this);\n\tthis._ctx = null;\n\tthis._syntaxErrors = 0;\n\tthis.setTrace(false);\n\tthis._precedenceStack = [];\n\tthis._precedenceStack.push(0);\n\tif (this._interp !== null) {\n\t\tthis._interp.reset();\n\t}\n};\n\n// Match current input symbol against {@code ttype}. If the symbol type\n// matches, {@link ANTLRErrorStrategy//reportMatch} and {@link //consume} are\n// called to complete the match process.\n//\n// <p>If the symbol type does not match,\n// {@link ANTLRErrorStrategy//recoverInline} is called on the current error\n// strategy to attempt recovery. If {@link //getBuildParseTree} is\n// {@code true} and the token index of the symbol returned by\n// {@link ANTLRErrorStrategy//recoverInline} is -1, the symbol is added to\n// the parse tree by calling {@link ParserRuleContext//addErrorNode}.</p>\n//\n// @param ttype the token type to match\n// @return the matched symbol\n// @throws RecognitionException if the current input symbol did not match\n// {@code ttype} and the error strategy could not recover from the\n// mismatched symbol\n\nParser.prototype.match = function(ttype) {\n\tvar t = this.getCurrentToken();\n\tif (t.type === ttype) {\n\t\tthis._errHandler.reportMatch(this);\n\t\tthis.consume();\n\t} else {\n\t\tt = this._errHandler.recoverInline(this);\n\t\tif (this.buildParseTrees && t.tokenIndex === -1) {\n\t\t\t// we must have conjured up a new token during single token\n\t\t\t// insertion\n\t\t\t// if it's not the current symbol\n\t\t\tthis._ctx.addErrorNode(t);\n\t\t}\n\t}\n\treturn t;\n};\n// Match current input symbol as a wildcard. If the symbol type matches\n// (i.e. has a value greater than 0), {@link ANTLRErrorStrategy//reportMatch}\n// and {@link //consume} are called to complete the match process.\n//\n// <p>If the symbol type does not match,\n// {@link ANTLRErrorStrategy//recoverInline} is called on the current error\n// strategy to attempt recovery. If {@link //getBuildParseTree} is\n// {@code true} and the token index of the symbol returned by\n// {@link ANTLRErrorStrategy//recoverInline} is -1, the symbol is added to\n// the parse tree by calling {@link ParserRuleContext//addErrorNode}.</p>\n//\n// @return the matched symbol\n// @throws RecognitionException if the current input symbol did not match\n// a wildcard and the error strategy could not recover from the mismatched\n// symbol\n\nParser.prototype.matchWildcard = function() {\n\tvar t = this.getCurrentToken();\n\tif (t.type > 0) {\n\t\tthis._errHandler.reportMatch(this);\n\t\tthis.consume();\n\t} else {\n\t\tt = this._errHandler.recoverInline(this);\n\t\tif (this._buildParseTrees && t.tokenIndex === -1) {\n\t\t\t// we must have conjured up a new token during single token\n\t\t\t// insertion\n\t\t\t// if it's not the current symbol\n\t\t\tthis._ctx.addErrorNode(t);\n\t\t}\n\t}\n\treturn t;\n};\n\nParser.prototype.getParseListeners = function() {\n\treturn this._parseListeners || [];\n};\n\n// Registers {@code listener} to receive events during the parsing process.\n//\n// <p>To support output-preserving grammar transformations (including but not\n// limited to left-recursion removal, automated left-factoring, and\n// optimized code generation), calls to listener methods during the parse\n// may differ substantially from calls made by\n// {@link ParseTreeWalker//DEFAULT} used after the parse is complete. In\n// particular, rule entry and exit events may occur in a different order\n// during the parse than after the parser. In addition, calls to certain\n// rule entry methods may be omitted.</p>\n//\n// <p>With the following specific exceptions, calls to listener events are\n// <em>deterministic</em>, i.e. for identical input the calls to listener\n// methods will be the same.</p>\n//\n// <ul>\n// <li>Alterations to the grammar used to generate code may change the\n// behavior of the listener calls.</li>\n// <li>Alterations to the command line options passed to ANTLR 4 when\n// generating the parser may change the behavior of the listener calls.</li>\n// <li>Changing the version of the ANTLR Tool used to generate the parser\n// may change the behavior of the listener calls.</li>\n// </ul>\n//\n// @param listener the listener to add\n//\n// @throws NullPointerException if {@code} listener is {@code null}\n//\nParser.prototype.addParseListener = function(listener) {\n\tif (listener === null) {\n\t\tthrow \"listener\";\n\t}\n\tif (this._parseListeners === null) {\n\t\tthis._parseListeners = [];\n\t}\n\tthis._parseListeners.push(listener);\n};\n\n//\n// Remove {@code listener} from the list of parse listeners.\n//\n// <p>If {@code listener} is {@code null} or has not been added as a parse\n// listener, this method does nothing.</p>\n// @param listener the listener to remove\n//\nParser.prototype.removeParseListener = function(listener) {\n\tif (this._parseListeners !== null) {\n\t\tvar idx = this._parseListeners.indexOf(listener);\n\t\tif (idx >= 0) {\n\t\t\tthis._parseListeners.splice(idx, 1);\n\t\t}\n\t\tif (this._parseListeners.length === 0) {\n\t\t\tthis._parseListeners = null;\n\t\t}\n\t}\n};\n\n// Remove all parse listeners.\nParser.prototype.removeParseListeners = function() {\n\tthis._parseListeners = null;\n};\n\n// Notify any parse listeners of an enter rule event.\nParser.prototype.triggerEnterRuleEvent = function() {\n\tif (this._parseListeners !== null) {\n        var ctx = this._ctx;\n\t\tthis._parseListeners.map(function(listener) {\n\t\t\tlistener.enterEveryRule(ctx);\n\t\t\tctx.enterRule(listener);\n\t\t});\n\t}\n};\n\n//\n// Notify any parse listeners of an exit rule event.\n//\n// @see //addParseListener\n//\nParser.prototype.triggerExitRuleEvent = function() {\n\tif (this._parseListeners !== null) {\n\t\t// reverse order walk of listeners\n        var ctx = this._ctx;\n\t\tthis._parseListeners.slice(0).reverse().map(function(listener) {\n\t\t\tctx.exitRule(listener);\n\t\t\tlistener.exitEveryRule(ctx);\n\t\t});\n\t}\n};\n\nParser.prototype.getTokenFactory = function() {\n\treturn this._input.tokenSource._factory;\n};\n\n// Tell our token source and error strategy about a new way to create tokens.//\nParser.prototype.setTokenFactory = function(factory) {\n\tthis._input.tokenSource._factory = factory;\n};\n\n// The ATN with bypass alternatives is expensive to create so we create it\n// lazily.\n//\n// @throws UnsupportedOperationException if the current parser does not\n// implement the {@link //getSerializedATN()} method.\n//\nParser.prototype.getATNWithBypassAlts = function() {\n\tvar serializedAtn = this.getSerializedATN();\n\tif (serializedAtn === null) {\n\t\tthrow \"The current parser does not support an ATN with bypass alternatives.\";\n\t}\n\tvar result = this.bypassAltsAtnCache[serializedAtn];\n\tif (result === null) {\n\t\tvar deserializationOptions = new ATNDeserializationOptions();\n\t\tdeserializationOptions.generateRuleBypassTransitions = true;\n\t\tresult = new ATNDeserializer(deserializationOptions)\n\t\t\t\t.deserialize(serializedAtn);\n\t\tthis.bypassAltsAtnCache[serializedAtn] = result;\n\t}\n\treturn result;\n};\n\n// The preferred method of getting a tree pattern. For example, here's a\n// sample use:\n//\n// <pre>\n// ParseTree t = parser.expr();\n// ParseTreePattern p = parser.compileParseTreePattern(\"&lt;ID&gt;+0\",\n// MyParser.RULE_expr);\n// ParseTreeMatch m = p.match(t);\n// String id = m.get(\"ID\");\n// </pre>\n\nvar Lexer = require('./Lexer').Lexer;\n\nParser.prototype.compileParseTreePattern = function(pattern, patternRuleIndex, lexer) {\n\tlexer = lexer || null;\n\tif (lexer === null) {\n\t\tif (this.getTokenStream() !== null) {\n\t\t\tvar tokenSource = this.getTokenStream().tokenSource;\n\t\t\tif (tokenSource instanceof Lexer) {\n\t\t\t\tlexer = tokenSource;\n\t\t\t}\n\t\t}\n\t}\n\tif (lexer === null) {\n\t\tthrow \"Parser can't discover a lexer to use\";\n\t}\n\tvar m = new ParseTreePatternMatcher(lexer, this);\n\treturn m.compile(pattern, patternRuleIndex);\n};\n\nParser.prototype.getInputStream = function() {\n\treturn this.getTokenStream();\n};\n\nParser.prototype.setInputStream = function(input) {\n\tthis.setTokenStream(input);\n};\n\nParser.prototype.getTokenStream = function() {\n\treturn this._input;\n};\n\n// Set the token stream and reset the parser.//\nParser.prototype.setTokenStream = function(input) {\n\tthis._input = null;\n\tthis.reset();\n\tthis._input = input;\n};\n\n// Match needs to return the current input symbol, which gets put\n// into the label for the associated token ref; e.g., x=ID.\n//\nParser.prototype.getCurrentToken = function() {\n\treturn this._input.LT(1);\n};\n\nParser.prototype.notifyErrorListeners = function(msg, offendingToken, err) {\n\toffendingToken = offendingToken || null;\n\terr = err || null;\n\tif (offendingToken === null) {\n\t\toffendingToken = this.getCurrentToken();\n\t}\n\tthis._syntaxErrors += 1;\n\tvar line = offendingToken.line;\n\tvar column = offendingToken.column;\n\tvar listener = this.getErrorListenerDispatch();\n\tlistener.syntaxError(this, offendingToken, line, column, msg, err);\n};\n\n//\n// Consume and return the {@linkplain //getCurrentToken current symbol}.\n//\n// <p>E.g., given the following input with {@code A} being the current\n// lookahead symbol, this function moves the cursor to {@code B} and returns\n// {@code A}.</p>\n//\n// <pre>\n// A B\n// ^\n// </pre>\n//\n// If the parser is not in error recovery mode, the consumed symbol is added\n// to the parse tree using {@link ParserRuleContext//addChild(Token)}, and\n// {@link ParseTreeListener//visitTerminal} is called on any parse listeners.\n// If the parser <em>is</em> in error recovery mode, the consumed symbol is\n// added to the parse tree using\n// {@link ParserRuleContext//addErrorNode(Token)}, and\n// {@link ParseTreeListener//visitErrorNode} is called on any parse\n// listeners.\n//\nParser.prototype.consume = function() {\n\tvar o = this.getCurrentToken();\n\tif (o.type !== Token.EOF) {\n\t\tthis.getInputStream().consume();\n\t}\n\tvar hasListener = this._parseListeners !== null && this._parseListeners.length > 0;\n\tif (this.buildParseTrees || hasListener) {\n\t\tvar node;\n\t\tif (this._errHandler.inErrorRecoveryMode(this)) {\n\t\t\tnode = this._ctx.addErrorNode(o);\n\t\t} else {\n\t\t\tnode = this._ctx.addTokenNode(o);\n\t\t}\n        node.invokingState = this.state;\n\t\tif (hasListener) {\n\t\t\tthis._parseListeners.map(function(listener) {\n\t\t\t\tif (node instanceof ErrorNode || (node.isErrorNode !== undefined && node.isErrorNode())) {\n\t\t\t\t\tlistener.visitErrorNode(node);\n\t\t\t\t} else if (node instanceof TerminalNode) {\n\t\t\t\t\tlistener.visitTerminal(node);\n\t\t\t\t}\n\t\t\t});\n\t\t}\n\t}\n\treturn o;\n};\n\nParser.prototype.addContextToParseTree = function() {\n\t// add current context to parent if we have a parent\n\tif (this._ctx.parentCtx !== null) {\n\t\tthis._ctx.parentCtx.addChild(this._ctx);\n\t}\n};\n\n// Always called by generated parsers upon entry to a rule. Access field\n// {@link //_ctx} get the current context.\n\nParser.prototype.enterRule = function(localctx, state, ruleIndex) {\n\tthis.state = state;\n\tthis._ctx = localctx;\n\tthis._ctx.start = this._input.LT(1);\n\tif (this.buildParseTrees) {\n\t\tthis.addContextToParseTree();\n\t}\n\tif (this._parseListeners !== null) {\n\t\tthis.triggerEnterRuleEvent();\n\t}\n};\n\nParser.prototype.exitRule = function() {\n\tthis._ctx.stop = this._input.LT(-1);\n\t// trigger event on _ctx, before it reverts to parent\n\tif (this._parseListeners !== null) {\n\t\tthis.triggerExitRuleEvent();\n\t}\n\tthis.state = this._ctx.invokingState;\n\tthis._ctx = this._ctx.parentCtx;\n};\n\nParser.prototype.enterOuterAlt = function(localctx, altNum) {\n   \tlocalctx.setAltNumber(altNum);\n\t// if we have new localctx, make sure we replace existing ctx\n\t// that is previous child of parse tree\n\tif (this.buildParseTrees && this._ctx !== localctx) {\n\t\tif (this._ctx.parentCtx !== null) {\n\t\t\tthis._ctx.parentCtx.removeLastChild();\n\t\t\tthis._ctx.parentCtx.addChild(localctx);\n\t\t}\n\t}\n\tthis._ctx = localctx;\n};\n\n// Get the precedence level for the top-most precedence rule.\n//\n// @return The precedence level for the top-most precedence rule, or -1 if\n// the parser context is not nested within a precedence rule.\n\nParser.prototype.getPrecedence = function() {\n\tif (this._precedenceStack.length === 0) {\n\t\treturn -1;\n\t} else {\n\t\treturn this._precedenceStack[this._precedenceStack.length-1];\n\t}\n};\n\nParser.prototype.enterRecursionRule = function(localctx, state, ruleIndex,\n\t\tprecedence) {\n\tthis.state = state;\n\tthis._precedenceStack.push(precedence);\n\tthis._ctx = localctx;\n\tthis._ctx.start = this._input.LT(1);\n\tif (this._parseListeners !== null) {\n\t\tthis.triggerEnterRuleEvent(); // simulates rule entry for\n\t\t\t\t\t\t\t\t\t\t// left-recursive rules\n\t}\n};\n\n//\n// Like {@link //enterRule} but for recursive rules.\n\nParser.prototype.pushNewRecursionContext = function(localctx, state, ruleIndex) {\n\tvar previous = this._ctx;\n\tprevious.parentCtx = localctx;\n\tprevious.invokingState = state;\n\tprevious.stop = this._input.LT(-1);\n\n\tthis._ctx = localctx;\n\tthis._ctx.start = previous.start;\n\tif (this.buildParseTrees) {\n\t\tthis._ctx.addChild(previous);\n\t}\n\tif (this._parseListeners !== null) {\n\t\tthis.triggerEnterRuleEvent(); // simulates rule entry for\n\t\t\t\t\t\t\t\t\t\t// left-recursive rules\n\t}\n};\n\nParser.prototype.unrollRecursionContexts = function(parentCtx) {\n\tthis._precedenceStack.pop();\n\tthis._ctx.stop = this._input.LT(-1);\n\tvar retCtx = this._ctx; // save current ctx (return value)\n\t// unroll so _ctx is as it was before call to recursive method\n\tif (this._parseListeners !== null) {\n\t\twhile (this._ctx !== parentCtx) {\n\t\t\tthis.triggerExitRuleEvent();\n\t\t\tthis._ctx = this._ctx.parentCtx;\n\t\t}\n\t} else {\n\t\tthis._ctx = parentCtx;\n\t}\n\t// hook into tree\n\tretCtx.parentCtx = parentCtx;\n\tif (this.buildParseTrees && parentCtx !== null) {\n\t\t// add return ctx into invoking rule's tree\n\t\tparentCtx.addChild(retCtx);\n\t}\n};\n\nParser.prototype.getInvokingContext = function(ruleIndex) {\n\tvar ctx = this._ctx;\n\twhile (ctx !== null) {\n\t\tif (ctx.ruleIndex === ruleIndex) {\n\t\t\treturn ctx;\n\t\t}\n\t\tctx = ctx.parentCtx;\n\t}\n\treturn null;\n};\n\nParser.prototype.precpred = function(localctx, precedence) {\n\treturn precedence >= this._precedenceStack[this._precedenceStack.length-1];\n};\n\nParser.prototype.inContext = function(context) {\n\t// TODO: useful in parser?\n\treturn false;\n};\n\n//\n// Checks whether or not {@code symbol} can follow the current state in the\n// ATN. The behavior of this method is equivalent to the following, but is\n// implemented such that the complete context-sensitive follow set does not\n// need to be explicitly constructed.\n//\n// <pre>\n// return getExpectedTokens().contains(symbol);\n// </pre>\n//\n// @param symbol the symbol type to check\n// @return {@code true} if {@code symbol} can follow the current state in\n// the ATN, otherwise {@code false}.\n\nParser.prototype.isExpectedToken = function(symbol) {\n\tvar atn = this._interp.atn;\n\tvar ctx = this._ctx;\n\tvar s = atn.states[this.state];\n\tvar following = atn.nextTokens(s);\n\tif (following.contains(symbol)) {\n\t\treturn true;\n\t}\n\tif (!following.contains(Token.EPSILON)) {\n\t\treturn false;\n\t}\n\twhile (ctx !== null && ctx.invokingState >= 0 && following.contains(Token.EPSILON)) {\n\t\tvar invokingState = atn.states[ctx.invokingState];\n\t\tvar rt = invokingState.transitions[0];\n\t\tfollowing = atn.nextTokens(rt.followState);\n\t\tif (following.contains(symbol)) {\n\t\t\treturn true;\n\t\t}\n\t\tctx = ctx.parentCtx;\n\t}\n\tif (following.contains(Token.EPSILON) && symbol === Token.EOF) {\n\t\treturn true;\n\t} else {\n\t\treturn false;\n\t}\n};\n\n// Computes the set of input symbols which could follow the current parser\n// state and context, as given by {@link //getState} and {@link //getContext},\n// respectively.\n//\n// @see ATN//getExpectedTokens(int, RuleContext)\n//\nParser.prototype.getExpectedTokens = function() {\n\treturn this._interp.atn.getExpectedTokens(this.state, this._ctx);\n};\n\nParser.prototype.getExpectedTokensWithinCurrentRule = function() {\n\tvar atn = this._interp.atn;\n\tvar s = atn.states[this.state];\n\treturn atn.nextTokens(s);\n};\n\n// Get a rule's index (i.e., {@code RULE_ruleName} field) or -1 if not found.//\nParser.prototype.getRuleIndex = function(ruleName) {\n\tvar ruleIndex = this.getRuleIndexMap()[ruleName];\n\tif (ruleIndex !== null) {\n\t\treturn ruleIndex;\n\t} else {\n\t\treturn -1;\n\t}\n};\n\n// Return List&lt;String&gt; of the rule names in your parser instance\n// leading up to a call to the current rule. You could override if\n// you want more details such as the file/line info of where\n// in the ATN a rule is invoked.\n//\n// this is very useful for error messages.\n//\nParser.prototype.getRuleInvocationStack = function(p) {\n\tp = p || null;\n\tif (p === null) {\n\t\tp = this._ctx;\n\t}\n\tvar stack = [];\n\twhile (p !== null) {\n\t\t// compute what follows who invoked us\n\t\tvar ruleIndex = p.ruleIndex;\n\t\tif (ruleIndex < 0) {\n\t\t\tstack.push(\"n/a\");\n\t\t} else {\n\t\t\tstack.push(this.ruleNames[ruleIndex]);\n\t\t}\n\t\tp = p.parentCtx;\n\t}\n\treturn stack;\n};\n\n// For debugging and other purposes.//\nParser.prototype.getDFAStrings = function() {\n\treturn this._interp.decisionToDFA.toString();\n};\n// For debugging and other purposes.//\nParser.prototype.dumpDFA = function() {\n\tvar seenOne = false;\n\tfor (var i = 0; i < this._interp.decisionToDFA.length; i++) {\n\t\tvar dfa = this._interp.decisionToDFA[i];\n\t\tif (dfa.states.length > 0) {\n\t\t\tif (seenOne) {\n\t\t\t\tconsole.log();\n\t\t\t}\n\t\t\tthis.printer.println(\"Decision \" + dfa.decision + \":\");\n\t\t\tthis.printer.print(dfa.toString(this.literalNames, this.symbolicNames));\n\t\t\tseenOne = true;\n\t\t}\n\t}\n};\n\n/*\n\"\t\t\tprinter = function() {\\r\\n\" +\n\"\t\t\t\tthis.println = function(s) { document.getElementById('output') += s + '\\\\n'; }\\r\\n\" +\n\"\t\t\t\tthis.print = function(s) { document.getElementById('output') += s; }\\r\\n\" +\n\"\t\t\t};\\r\\n\" +\n*/\n\nParser.prototype.getSourceName = function() {\n\treturn this._input.sourceName;\n};\n\n// During a parse is sometimes useful to listen in on the rule entry and exit\n// events as well as token matches. this is for quick and dirty debugging.\n//\nParser.prototype.setTrace = function(trace) {\n\tif (!trace) {\n\t\tthis.removeParseListener(this._tracer);\n\t\tthis._tracer = null;\n\t} else {\n\t\tif (this._tracer !== null) {\n\t\t\tthis.removeParseListener(this._tracer);\n\t\t}\n\t\tthis._tracer = new TraceListener(this);\n\t\tthis.addParseListener(this._tracer);\n\t}\n};\n\nexports.Parser = Parser;","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n\n//* A rule invocation record for parsing.\n//\n//  Contains all of the information about the current rule not stored in the\n//  RuleContext. It handles parse tree children list, Any ATN state\n//  tracing, and the default values available for rule indications:\n//  start, stop, rule index, current alt number, current\n//  ATN state.\n//\n//  Subclasses made for each rule and grammar track the parameters,\n//  return values, locals, and labels specific to that rule. These\n//  are the objects that are returned from rules.\n//\n//  Note text is not an actual field of a rule return value; it is computed\n//  from start and stop using the input stream's toString() method.  I\n//  could add a ctor to this so that we can pass in and store the input\n//  stream, but I'm not sure we want to do that.  It would seem to be undefined\n//  to get the .text property anyway if the rule matches tokens from multiple\n//  input streams.\n//\n//  I do not use getters for fields of objects that are used simply to\n//  group values such as this aggregate.  The getters/setters are there to\n//  satisfy the superclass interface.\n\nvar RuleContext = require('./RuleContext').RuleContext;\nvar Tree = require('./tree/Tree');\nvar INVALID_INTERVAL = Tree.INVALID_INTERVAL;\nvar TerminalNode = Tree.TerminalNode;\nvar TerminalNodeImpl = Tree.TerminalNodeImpl;\nvar ErrorNodeImpl = Tree.ErrorNodeImpl;\nvar Interval = require(\"./IntervalSet\").Interval;\n\nfunction ParserRuleContext(parent, invokingStateNumber) {\n\tparent = parent || null;\n\tinvokingStateNumber = invokingStateNumber || null;\n\tRuleContext.call(this, parent, invokingStateNumber);\n\tthis.ruleIndex = -1;\n    // * If we are debugging or building a parse tree for a visitor,\n    // we need to track all of the tokens and rule invocations associated\n    // with this rule's context. This is empty for parsing w/o tree constr.\n    // operation because we don't the need to track the details about\n    // how we parse this rule.\n    // /\n    this.children = null;\n    this.start = null;\n    this.stop = null;\n    // The exception that forced this rule to return. If the rule successfully\n    // completed, this is {@code null}.\n    this.exception = null;\n}\n\nParserRuleContext.prototype = Object.create(RuleContext.prototype);\nParserRuleContext.prototype.constructor = ParserRuleContext;\n\n// * COPY a ctx (I'm deliberately not using copy constructor)///\nParserRuleContext.prototype.copyFrom = function(ctx) {\n    // from RuleContext\n    this.parentCtx = ctx.parentCtx;\n    this.invokingState = ctx.invokingState;\n    this.children = null;\n    this.start = ctx.start;\n    this.stop = ctx.stop;\n    // copy any error nodes to alt label node\n    if(ctx.children) {\n        this.children = [];\n        // reset parent pointer for any error nodes\n    \tctx.children.map(function(child) {\n    \t\tif (child instanceof ErrorNodeImpl) {\n                this.children.push(child);\n                child.parentCtx = this;\n            }\n\t\t}, this);\n\t}\n};\n\n// Double dispatch methods for listeners\nParserRuleContext.prototype.enterRule = function(listener) {\n};\n\nParserRuleContext.prototype.exitRule = function(listener) {\n};\n\n// * Does not set parent link; other add methods do that///\nParserRuleContext.prototype.addChild = function(child) {\n    if (this.children === null) {\n        this.children = [];\n    }\n    this.children.push(child);\n    return child;\n};\n\n// * Used by enterOuterAlt to toss out a RuleContext previously added as\n// we entered a rule. If we have // label, we will need to remove\n// generic ruleContext object.\n// /\nParserRuleContext.prototype.removeLastChild = function() {\n    if (this.children !== null) {\n        this.children.pop();\n    }\n};\n\nParserRuleContext.prototype.addTokenNode = function(token) {\n    var node = new TerminalNodeImpl(token);\n    this.addChild(node);\n    node.parentCtx = this;\n    return node;\n};\n\nParserRuleContext.prototype.addErrorNode = function(badToken) {\n    var node = new ErrorNodeImpl(badToken);\n    this.addChild(node);\n    node.parentCtx = this;\n    return node;\n};\n\nParserRuleContext.prototype.getChild = function(i, type) {\n\ttype = type || null;\n\tif (this.children === null || i < 0 || i >= this.children.length) {\n\t\treturn null;\n\t}\n\tif (type === null) {\n\t\treturn this.children[i];\n\t} else {\n\t\tfor(var j=0; j<this.children.length; j++) {\n\t\t\tvar child = this.children[j];\n\t\t\tif(child instanceof type) {\n\t\t\t\tif(i===0) {\n\t\t\t\t\treturn child;\n\t\t\t\t} else {\n\t\t\t\t\ti -= 1;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn null;\n    }\n};\n\n\nParserRuleContext.prototype.getToken = function(ttype, i) {\n\tif (this.children === null || i < 0 || i >= this.children.length) {\n\t\treturn null;\n\t}\n\tfor(var j=0; j<this.children.length; j++) {\n\t\tvar child = this.children[j];\n\t\tif (child instanceof TerminalNode) {\n\t\t\tif (child.symbol.type === ttype) {\n\t\t\t\tif(i===0) {\n\t\t\t\t\treturn child;\n\t\t\t\t} else {\n\t\t\t\t\ti -= 1;\n\t\t\t\t}\n\t\t\t}\n        }\n\t}\n    return null;\n};\n\nParserRuleContext.prototype.getTokens = function(ttype ) {\n    if (this.children=== null) {\n        return [];\n    } else {\n\t\tvar tokens = [];\n\t\tfor(var j=0; j<this.children.length; j++) {\n\t\t\tvar child = this.children[j];\n\t\t\tif (child instanceof TerminalNode) {\n\t\t\t\tif (child.symbol.type === ttype) {\n\t\t\t\t\ttokens.push(child);\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn tokens;\n    }\n};\n\nParserRuleContext.prototype.getTypedRuleContext = function(ctxType, i) {\n    return this.getChild(i, ctxType);\n};\n\nParserRuleContext.prototype.getTypedRuleContexts = function(ctxType) {\n    if (this.children=== null) {\n        return [];\n    } else {\n\t\tvar contexts = [];\n\t\tfor(var j=0; j<this.children.length; j++) {\n\t\t\tvar child = this.children[j];\n\t\t\tif (child instanceof ctxType) {\n\t\t\t\tcontexts.push(child);\n\t\t\t}\n\t\t}\n\t\treturn contexts;\n\t}\n};\n\nParserRuleContext.prototype.getChildCount = function() {\n\tif (this.children=== null) {\n\t\treturn 0;\n\t} else {\n\t\treturn this.children.length;\n\t}\n};\n\nParserRuleContext.prototype.getSourceInterval = function() {\n    if( this.start === null || this.stop === null) {\n        return INVALID_INTERVAL;\n    } else {\n        return new Interval(this.start.tokenIndex, this.stop.tokenIndex);\n    }\n};\n\nRuleContext.EMPTY = new ParserRuleContext();\n\nfunction InterpreterRuleContext(parent, invokingStateNumber, ruleIndex) {\n\tParserRuleContext.call(parent, invokingStateNumber);\n    this.ruleIndex = ruleIndex;\n    return this;\n}\n\nInterpreterRuleContext.prototype = Object.create(ParserRuleContext.prototype);\nInterpreterRuleContext.prototype.constructor = InterpreterRuleContext;\n\nexports.ParserRuleContext = ParserRuleContext;","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n///\n\nvar RuleContext = require('./RuleContext').RuleContext;\nvar Hash = require('./Utils').Hash;\nvar Map = require('./Utils').Map;\n\nfunction PredictionContext(cachedHashCode) {\n\tthis.cachedHashCode = cachedHashCode;\n}\n\n// Represents {@code $} in local context prediction, which means wildcard.\n// {@code//+x =//}.\n// /\nPredictionContext.EMPTY = null;\n\n// Represents {@code $} in an array in full context mode, when {@code $}\n// doesn't mean wildcard: {@code $ + x = [$,x]}. Here,\n// {@code $} = {@link //EMPTY_RETURN_STATE}.\n// /\nPredictionContext.EMPTY_RETURN_STATE = 0x7FFFFFFF;\n\nPredictionContext.globalNodeCount = 1;\nPredictionContext.id = PredictionContext.globalNodeCount;\n\n// Stores the computed hash code of this {@link PredictionContext}. The hash\n// code is computed in parts to match the following reference algorithm.\n//\n// <pre>\n// private int referenceHashCode() {\n// int hash = {@link MurmurHash//initialize MurmurHash.initialize}({@link\n// //INITIAL_HASH});\n//\n// for (int i = 0; i &lt; {@link //size()}; i++) {\n// hash = {@link MurmurHash//update MurmurHash.update}(hash, {@link //getParent\n// getParent}(i));\n// }\n//\n// for (int i = 0; i &lt; {@link //size()}; i++) {\n// hash = {@link MurmurHash//update MurmurHash.update}(hash, {@link\n// //getReturnState getReturnState}(i));\n// }\n//\n// hash = {@link MurmurHash//finish MurmurHash.finish}(hash, 2// {@link\n// //size()});\n// return hash;\n// }\n// </pre>\n// /\n\n// This means only the {@link //EMPTY} context is in set.\nPredictionContext.prototype.isEmpty = function() {\n\treturn this === PredictionContext.EMPTY;\n};\n\nPredictionContext.prototype.hasEmptyPath = function() {\n\treturn this.getReturnState(this.length - 1) === PredictionContext.EMPTY_RETURN_STATE;\n};\n\nPredictionContext.prototype.hashCode = function() {\n\treturn this.cachedHashCode;\n};\n\n\nPredictionContext.prototype.updateHashCode = function(hash) {\n    hash.update(this.cachedHashCode);\n};\n/*\nfunction calculateHashString(parent, returnState) {\n\treturn \"\" + parent + returnState;\n}\n*/\n\n// Used to cache {@link PredictionContext} objects. Its used for the shared\n// context cash associated with contexts in DFA states. This cache\n// can be used for both lexers and parsers.\n\nfunction PredictionContextCache() {\n\tthis.cache = new Map();\n\treturn this;\n}\n\n// Add a context to the cache and return it. If the context already exists,\n// return that one instead and do not add a new context to the cache.\n// Protect shared cache from unsafe thread access.\n//\nPredictionContextCache.prototype.add = function(ctx) {\n\tif (ctx === PredictionContext.EMPTY) {\n\t\treturn PredictionContext.EMPTY;\n\t}\n\tvar existing = this.cache.get(ctx) || null;\n\tif (existing !== null) {\n\t\treturn existing;\n\t}\n\tthis.cache.put(ctx, ctx);\n\treturn ctx;\n};\n\nPredictionContextCache.prototype.get = function(ctx) {\n\treturn this.cache.get(ctx) || null;\n};\n\nObject.defineProperty(PredictionContextCache.prototype, \"length\", {\n\tget : function() {\n\t\treturn this.cache.length;\n\t}\n});\n\nfunction SingletonPredictionContext(parent, returnState) {\n\tvar hashCode = 0;\n\tvar hash = new Hash();\n\tif(parent !== null) {\n\t\thash.update(parent, returnState);\n\t} else {\n\t\thash.update(1);\n\t}\n\thashCode = hash.finish();\n\tPredictionContext.call(this, hashCode);\n\tthis.parentCtx = parent;\n\tthis.returnState = returnState;\n}\n\nSingletonPredictionContext.prototype = Object.create(PredictionContext.prototype);\nSingletonPredictionContext.prototype.contructor = SingletonPredictionContext;\n\nSingletonPredictionContext.create = function(parent, returnState) {\n\tif (returnState === PredictionContext.EMPTY_RETURN_STATE && parent === null) {\n\t\t// someone can pass in the bits of an array ctx that mean $\n\t\treturn PredictionContext.EMPTY;\n\t} else {\n\t\treturn new SingletonPredictionContext(parent, returnState);\n\t}\n};\n\nObject.defineProperty(SingletonPredictionContext.prototype, \"length\", {\n\tget : function() {\n\t\treturn 1;\n\t}\n});\n\nSingletonPredictionContext.prototype.getParent = function(index) {\n\treturn this.parentCtx;\n};\n\nSingletonPredictionContext.prototype.getReturnState = function(index) {\n\treturn this.returnState;\n};\n\nSingletonPredictionContext.prototype.equals = function(other) {\n\tif (this === other) {\n\t\treturn true;\n\t} else if (!(other instanceof SingletonPredictionContext)) {\n\t\treturn false;\n\t} else if (this.hashCode() !== other.hashCode()) {\n\t\treturn false; // can't be same if hash is different\n\t} else {\n\t\tif(this.returnState !== other.returnState)\n            return false;\n        else if(this.parentCtx==null)\n            return other.parentCtx==null\n\t\telse\n            return this.parentCtx.equals(other.parentCtx);\n\t}\n};\n\nSingletonPredictionContext.prototype.toString = function() {\n\tvar up = this.parentCtx === null ? \"\" : this.parentCtx.toString();\n\tif (up.length === 0) {\n\t\tif (this.returnState === PredictionContext.EMPTY_RETURN_STATE) {\n\t\t\treturn \"$\";\n\t\t} else {\n\t\t\treturn \"\" + this.returnState;\n\t\t}\n\t} else {\n\t\treturn \"\" + this.returnState + \" \" + up;\n\t}\n};\n\nfunction EmptyPredictionContext() {\n\tSingletonPredictionContext.call(this, null, PredictionContext.EMPTY_RETURN_STATE);\n\treturn this;\n}\n\nEmptyPredictionContext.prototype = Object.create(SingletonPredictionContext.prototype);\nEmptyPredictionContext.prototype.constructor = EmptyPredictionContext;\n\nEmptyPredictionContext.prototype.isEmpty = function() {\n\treturn true;\n};\n\nEmptyPredictionContext.prototype.getParent = function(index) {\n\treturn null;\n};\n\nEmptyPredictionContext.prototype.getReturnState = function(index) {\n\treturn this.returnState;\n};\n\nEmptyPredictionContext.prototype.equals = function(other) {\n\treturn this === other;\n};\n\nEmptyPredictionContext.prototype.toString = function() {\n\treturn \"$\";\n};\n\nPredictionContext.EMPTY = new EmptyPredictionContext();\n\nfunction ArrayPredictionContext(parents, returnStates) {\n\t// Parent can be null only if full ctx mode and we make an array\n\t// from {@link //EMPTY} and non-empty. We merge {@link //EMPTY} by using\n\t// null parent and\n\t// returnState == {@link //EMPTY_RETURN_STATE}.\n\tvar h = new Hash();\n\th.update(parents, returnStates);\n\tvar hashCode = h.finish();\n\tPredictionContext.call(this, hashCode);\n\tthis.parents = parents;\n\tthis.returnStates = returnStates;\n\treturn this;\n}\n\nArrayPredictionContext.prototype = Object.create(PredictionContext.prototype);\nArrayPredictionContext.prototype.constructor = ArrayPredictionContext;\n\nArrayPredictionContext.prototype.isEmpty = function() {\n\t// since EMPTY_RETURN_STATE can only appear in the last position, we\n\t// don't need to verify that size==1\n\treturn this.returnStates[0] === PredictionContext.EMPTY_RETURN_STATE;\n};\n\nObject.defineProperty(ArrayPredictionContext.prototype, \"length\", {\n\tget : function() {\n\t\treturn this.returnStates.length;\n\t}\n});\n\nArrayPredictionContext.prototype.getParent = function(index) {\n\treturn this.parents[index];\n};\n\nArrayPredictionContext.prototype.getReturnState = function(index) {\n\treturn this.returnStates[index];\n};\n\nArrayPredictionContext.prototype.equals = function(other) {\n\tif (this === other) {\n\t\treturn true;\n\t} else if (!(other instanceof ArrayPredictionContext)) {\n\t\treturn false;\n\t} else if (this.hashCode() !== other.hashCode()) {\n\t\treturn false; // can't be same if hash is different\n\t} else {\n\t\treturn this.returnStates === other.returnStates &&\n\t\t\t\tthis.parents === other.parents;\n\t}\n};\n\nArrayPredictionContext.prototype.toString = function() {\n\tif (this.isEmpty()) {\n\t\treturn \"[]\";\n\t} else {\n\t\tvar s = \"[\";\n\t\tfor (var i = 0; i < this.returnStates.length; i++) {\n\t\t\tif (i > 0) {\n\t\t\t\ts = s + \", \";\n\t\t\t}\n\t\t\tif (this.returnStates[i] === PredictionContext.EMPTY_RETURN_STATE) {\n\t\t\t\ts = s + \"$\";\n\t\t\t\tcontinue;\n\t\t\t}\n\t\t\ts = s + this.returnStates[i];\n\t\t\tif (this.parents[i] !== null) {\n\t\t\t\ts = s + \" \" + this.parents[i];\n\t\t\t} else {\n\t\t\t\ts = s + \"null\";\n\t\t\t}\n\t\t}\n\t\treturn s + \"]\";\n\t}\n};\n\n// Convert a {@link RuleContext} tree to a {@link PredictionContext} graph.\n// Return {@link //EMPTY} if {@code outerContext} is empty or null.\n// /\nfunction predictionContextFromRuleContext(atn, outerContext) {\n\tif (outerContext === undefined || outerContext === null) {\n\t\touterContext = RuleContext.EMPTY;\n\t}\n\t// if we are in RuleContext of start rule, s, then PredictionContext\n\t// is EMPTY. Nobody called us. (if we are empty, return empty)\n\tif (outerContext.parentCtx === null || outerContext === RuleContext.EMPTY) {\n\t\treturn PredictionContext.EMPTY;\n\t}\n\t// If we have a parent, convert it to a PredictionContext graph\n\tvar parent = predictionContextFromRuleContext(atn, outerContext.parentCtx);\n\tvar state = atn.states[outerContext.invokingState];\n\tvar transition = state.transitions[0];\n\treturn SingletonPredictionContext.create(parent, transition.followState.stateNumber);\n}\n/*\nfunction calculateListsHashString(parents, returnStates) {\n\tvar s = \"\";\n\tparents.map(function(p) {\n\t\ts = s + p;\n\t});\n\treturnStates.map(function(r) {\n\t\ts = s + r;\n\t});\n\treturn s;\n}\n*/\nfunction merge(a, b, rootIsWildcard, mergeCache) {\n\t// share same graph if both same\n\tif (a === b) {\n\t\treturn a;\n\t}\n\tif (a instanceof SingletonPredictionContext && b instanceof SingletonPredictionContext) {\n\t\treturn mergeSingletons(a, b, rootIsWildcard, mergeCache);\n\t}\n\t// At least one of a or b is array\n\t// If one is $ and rootIsWildcard, return $ as// wildcard\n\tif (rootIsWildcard) {\n\t\tif (a instanceof EmptyPredictionContext) {\n\t\t\treturn a;\n\t\t}\n\t\tif (b instanceof EmptyPredictionContext) {\n\t\t\treturn b;\n\t\t}\n\t}\n\t// convert singleton so both are arrays to normalize\n\tif (a instanceof SingletonPredictionContext) {\n\t\ta = new ArrayPredictionContext([a.getParent()], [a.returnState]);\n\t}\n\tif (b instanceof SingletonPredictionContext) {\n\t\tb = new ArrayPredictionContext([b.getParent()], [b.returnState]);\n\t}\n\treturn mergeArrays(a, b, rootIsWildcard, mergeCache);\n}\n\n//\n// Merge two {@link SingletonPredictionContext} instances.\n//\n// <p>Stack tops equal, parents merge is same; return left graph.<br>\n// <embed src=\"images/SingletonMerge_SameRootSamePar.svg\"\n// type=\"image/svg+xml\"/></p>\n//\n// <p>Same stack top, parents differ; merge parents giving array node, then\n// remainders of those graphs. A new root node is created to point to the\n// merged parents.<br>\n// <embed src=\"images/SingletonMerge_SameRootDiffPar.svg\"\n// type=\"image/svg+xml\"/></p>\n//\n// <p>Different stack tops pointing to same parent. Make array node for the\n// root where both element in the root point to the same (original)\n// parent.<br>\n// <embed src=\"images/SingletonMerge_DiffRootSamePar.svg\"\n// type=\"image/svg+xml\"/></p>\n//\n// <p>Different stack tops pointing to different parents. Make array node for\n// the root where each element points to the corresponding original\n// parent.<br>\n// <embed src=\"images/SingletonMerge_DiffRootDiffPar.svg\"\n// type=\"image/svg+xml\"/></p>\n//\n// @param a the first {@link SingletonPredictionContext}\n// @param b the second {@link SingletonPredictionContext}\n// @param rootIsWildcard {@code true} if this is a local-context merge,\n// otherwise false to indicate a full-context merge\n// @param mergeCache\n// /\nfunction mergeSingletons(a, b, rootIsWildcard, mergeCache) {\n\tif (mergeCache !== null) {\n\t\tvar previous = mergeCache.get(a, b);\n\t\tif (previous !== null) {\n\t\t\treturn previous;\n\t\t}\n\t\tprevious = mergeCache.get(b, a);\n\t\tif (previous !== null) {\n\t\t\treturn previous;\n\t\t}\n\t}\n\n\tvar rootMerge = mergeRoot(a, b, rootIsWildcard);\n\tif (rootMerge !== null) {\n\t\tif (mergeCache !== null) {\n\t\t\tmergeCache.set(a, b, rootMerge);\n\t\t}\n\t\treturn rootMerge;\n\t}\n\tif (a.returnState === b.returnState) {\n\t\tvar parent = merge(a.parentCtx, b.parentCtx, rootIsWildcard, mergeCache);\n\t\t// if parent is same as existing a or b parent or reduced to a parent,\n\t\t// return it\n\t\tif (parent === a.parentCtx) {\n\t\t\treturn a; // ax + bx = ax, if a=b\n\t\t}\n\t\tif (parent === b.parentCtx) {\n\t\t\treturn b; // ax + bx = bx, if a=b\n\t\t}\n\t\t// else: ax + ay = a'[x,y]\n\t\t// merge parents x and y, giving array node with x,y then remainders\n\t\t// of those graphs. dup a, a' points at merged array\n\t\t// new joined parent so create new singleton pointing to it, a'\n\t\tvar spc = SingletonPredictionContext.create(parent, a.returnState);\n\t\tif (mergeCache !== null) {\n\t\t\tmergeCache.set(a, b, spc);\n\t\t}\n\t\treturn spc;\n\t} else { // a != b payloads differ\n\t\t// see if we can collapse parents due to $+x parents if local ctx\n\t\tvar singleParent = null;\n\t\tif (a === b || (a.parentCtx !== null && a.parentCtx === b.parentCtx)) { // ax +\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t// bx =\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t// [a,b]x\n\t\t\tsingleParent = a.parentCtx;\n\t\t}\n\t\tif (singleParent !== null) { // parents are same\n\t\t\t// sort payloads and use same parent\n\t\t\tvar payloads = [ a.returnState, b.returnState ];\n\t\t\tif (a.returnState > b.returnState) {\n\t\t\t\tpayloads[0] = b.returnState;\n\t\t\t\tpayloads[1] = a.returnState;\n\t\t\t}\n\t\t\tvar parents = [ singleParent, singleParent ];\n\t\t\tvar apc = new ArrayPredictionContext(parents, payloads);\n\t\t\tif (mergeCache !== null) {\n\t\t\t\tmergeCache.set(a, b, apc);\n\t\t\t}\n\t\t\treturn apc;\n\t\t}\n\t\t// parents differ and can't merge them. Just pack together\n\t\t// into array; can't merge.\n\t\t// ax + by = [ax,by]\n\t\tvar payloads = [ a.returnState, b.returnState ];\n\t\tvar parents = [ a.parentCtx, b.parentCtx ];\n\t\tif (a.returnState > b.returnState) { // sort by payload\n\t\t\tpayloads[0] = b.returnState;\n\t\t\tpayloads[1] = a.returnState;\n\t\t\tparents = [ b.parentCtx, a.parentCtx ];\n\t\t}\n\t\tvar a_ = new ArrayPredictionContext(parents, payloads);\n\t\tif (mergeCache !== null) {\n\t\t\tmergeCache.set(a, b, a_);\n\t\t}\n\t\treturn a_;\n\t}\n}\n\n//\n// Handle case where at least one of {@code a} or {@code b} is\n// {@link //EMPTY}. In the following diagrams, the symbol {@code $} is used\n// to represent {@link //EMPTY}.\n//\n// <h2>Local-Context Merges</h2>\n//\n// <p>These local-context merge operations are used when {@code rootIsWildcard}\n// is true.</p>\n//\n// <p>{@link //EMPTY} is superset of any graph; return {@link //EMPTY}.<br>\n// <embed src=\"images/LocalMerge_EmptyRoot.svg\" type=\"image/svg+xml\"/></p>\n//\n// <p>{@link //EMPTY} and anything is {@code //EMPTY}, so merged parent is\n// {@code //EMPTY}; return left graph.<br>\n// <embed src=\"images/LocalMerge_EmptyParent.svg\" type=\"image/svg+xml\"/></p>\n//\n// <p>Special case of last merge if local context.<br>\n// <embed src=\"images/LocalMerge_DiffRoots.svg\" type=\"image/svg+xml\"/></p>\n//\n// <h2>Full-Context Merges</h2>\n//\n// <p>These full-context merge operations are used when {@code rootIsWildcard}\n// is false.</p>\n//\n// <p><embed src=\"images/FullMerge_EmptyRoots.svg\" type=\"image/svg+xml\"/></p>\n//\n// <p>Must keep all contexts; {@link //EMPTY} in array is a special value (and\n// null parent).<br>\n// <embed src=\"images/FullMerge_EmptyRoot.svg\" type=\"image/svg+xml\"/></p>\n//\n// <p><embed src=\"images/FullMerge_SameRoot.svg\" type=\"image/svg+xml\"/></p>\n//\n// @param a the first {@link SingletonPredictionContext}\n// @param b the second {@link SingletonPredictionContext}\n// @param rootIsWildcard {@code true} if this is a local-context merge,\n// otherwise false to indicate a full-context merge\n// /\nfunction mergeRoot(a, b, rootIsWildcard) {\n\tif (rootIsWildcard) {\n\t\tif (a === PredictionContext.EMPTY) {\n\t\t\treturn PredictionContext.EMPTY; // // + b =//\n\t\t}\n\t\tif (b === PredictionContext.EMPTY) {\n\t\t\treturn PredictionContext.EMPTY; // a +// =//\n\t\t}\n\t} else {\n\t\tif (a === PredictionContext.EMPTY && b === PredictionContext.EMPTY) {\n\t\t\treturn PredictionContext.EMPTY; // $ + $ = $\n\t\t} else if (a === PredictionContext.EMPTY) { // $ + x = [$,x]\n\t\t\tvar payloads = [ b.returnState,\n\t\t\t\t\tPredictionContext.EMPTY_RETURN_STATE ];\n\t\t\tvar parents = [ b.parentCtx, null ];\n\t\t\treturn new ArrayPredictionContext(parents, payloads);\n\t\t} else if (b === PredictionContext.EMPTY) { // x + $ = [$,x] ($ is always first if present)\n\t\t\tvar payloads = [ a.returnState, PredictionContext.EMPTY_RETURN_STATE ];\n\t\t\tvar parents = [ a.parentCtx, null ];\n\t\t\treturn new ArrayPredictionContext(parents, payloads);\n\t\t}\n\t}\n\treturn null;\n}\n\n//\n// Merge two {@link ArrayPredictionContext} instances.\n//\n// <p>Different tops, different parents.<br>\n// <embed src=\"images/ArrayMerge_DiffTopDiffPar.svg\" type=\"image/svg+xml\"/></p>\n//\n// <p>Shared top, same parents.<br>\n// <embed src=\"images/ArrayMerge_ShareTopSamePar.svg\" type=\"image/svg+xml\"/></p>\n//\n// <p>Shared top, different parents.<br>\n// <embed src=\"images/ArrayMerge_ShareTopDiffPar.svg\" type=\"image/svg+xml\"/></p>\n//\n// <p>Shared top, all shared parents.<br>\n// <embed src=\"images/ArrayMerge_ShareTopSharePar.svg\"\n// type=\"image/svg+xml\"/></p>\n//\n// <p>Equal tops, merge parents and reduce top to\n// {@link SingletonPredictionContext}.<br>\n// <embed src=\"images/ArrayMerge_EqualTop.svg\" type=\"image/svg+xml\"/></p>\n// /\nfunction mergeArrays(a, b, rootIsWildcard, mergeCache) {\n\tif (mergeCache !== null) {\n\t\tvar previous = mergeCache.get(a, b);\n\t\tif (previous !== null) {\n\t\t\treturn previous;\n\t\t}\n\t\tprevious = mergeCache.get(b, a);\n\t\tif (previous !== null) {\n\t\t\treturn previous;\n\t\t}\n\t}\n\t// merge sorted payloads a + b => M\n\tvar i = 0; // walks a\n\tvar j = 0; // walks b\n\tvar k = 0; // walks target M array\n\n\tvar mergedReturnStates = [];\n\tvar mergedParents = [];\n\t// walk and merge to yield mergedParents, mergedReturnStates\n\twhile (i < a.returnStates.length && j < b.returnStates.length) {\n\t\tvar a_parent = a.parents[i];\n\t\tvar b_parent = b.parents[j];\n\t\tif (a.returnStates[i] === b.returnStates[j]) {\n\t\t\t// same payload (stack tops are equal), must yield merged singleton\n\t\t\tvar payload = a.returnStates[i];\n\t\t\t// $+$ = $\n\t\t\tvar bothDollars = payload === PredictionContext.EMPTY_RETURN_STATE &&\n\t\t\t\t\ta_parent === null && b_parent === null;\n\t\t\tvar ax_ax = (a_parent !== null && b_parent !== null && a_parent === b_parent); // ax+ax\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t// ->\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t// ax\n\t\t\tif (bothDollars || ax_ax) {\n\t\t\t\tmergedParents[k] = a_parent; // choose left\n\t\t\t\tmergedReturnStates[k] = payload;\n\t\t\t} else { // ax+ay -> a'[x,y]\n\t\t\t\tvar mergedParent = merge(a_parent, b_parent, rootIsWildcard, mergeCache);\n\t\t\t\tmergedParents[k] = mergedParent;\n\t\t\t\tmergedReturnStates[k] = payload;\n\t\t\t}\n\t\t\ti += 1; // hop over left one as usual\n\t\t\tj += 1; // but also skip one in right side since we merge\n\t\t} else if (a.returnStates[i] < b.returnStates[j]) { // copy a[i] to M\n\t\t\tmergedParents[k] = a_parent;\n\t\t\tmergedReturnStates[k] = a.returnStates[i];\n\t\t\ti += 1;\n\t\t} else { // b > a, copy b[j] to M\n\t\t\tmergedParents[k] = b_parent;\n\t\t\tmergedReturnStates[k] = b.returnStates[j];\n\t\t\tj += 1;\n\t\t}\n\t\tk += 1;\n\t}\n\t// copy over any payloads remaining in either array\n\tif (i < a.returnStates.length) {\n\t\tfor (var p = i; p < a.returnStates.length; p++) {\n\t\t\tmergedParents[k] = a.parents[p];\n\t\t\tmergedReturnStates[k] = a.returnStates[p];\n\t\t\tk += 1;\n\t\t}\n\t} else {\n\t\tfor (var p = j; p < b.returnStates.length; p++) {\n\t\t\tmergedParents[k] = b.parents[p];\n\t\t\tmergedReturnStates[k] = b.returnStates[p];\n\t\t\tk += 1;\n\t\t}\n\t}\n\t// trim merged if we combined a few that had same stack tops\n\tif (k < mergedParents.length) { // write index < last position; trim\n\t\tif (k === 1) { // for just one merged element, return singleton top\n\t\t\tvar a_ = SingletonPredictionContext.create(mergedParents[0],\n\t\t\t\t\tmergedReturnStates[0]);\n\t\t\tif (mergeCache !== null) {\n\t\t\t\tmergeCache.set(a, b, a_);\n\t\t\t}\n\t\t\treturn a_;\n\t\t}\n\t\tmergedParents = mergedParents.slice(0, k);\n\t\tmergedReturnStates = mergedReturnStates.slice(0, k);\n\t}\n\n\tvar M = new ArrayPredictionContext(mergedParents, mergedReturnStates);\n\n\t// if we created same array as a or b, return that instead\n\t// TODO: track whether this is possible above during merge sort for speed\n\tif (M === a) {\n\t\tif (mergeCache !== null) {\n\t\t\tmergeCache.set(a, b, a);\n\t\t}\n\t\treturn a;\n\t}\n\tif (M === b) {\n\t\tif (mergeCache !== null) {\n\t\t\tmergeCache.set(a, b, b);\n\t\t}\n\t\treturn b;\n\t}\n\tcombineCommonParents(mergedParents);\n\n\tif (mergeCache !== null) {\n\t\tmergeCache.set(a, b, M);\n\t}\n\treturn M;\n}\n\n//\n// Make pass over all <em>M</em> {@code parents}; merge any {@code equals()}\n// ones.\n// /\nfunction combineCommonParents(parents) {\n\tvar uniqueParents = new Map();\n\n\tfor (var p = 0; p < parents.length; p++) {\n\t\tvar parent = parents[p];\n\t\tif (!(uniqueParents.containsKey(parent))) {\n\t\t\tuniqueParents.put(parent, parent);\n\t\t}\n\t}\n\tfor (var q = 0; q < parents.length; q++) {\n\t\tparents[q] = uniqueParents.get(parents[q]);\n\t}\n}\n\nfunction getCachedPredictionContext(context, contextCache, visited) {\n\tif (context.isEmpty()) {\n\t\treturn context;\n\t}\n\tvar existing = visited.get(context) || null;\n\tif (existing !== null) {\n\t\treturn existing;\n\t}\n\texisting = contextCache.get(context);\n\tif (existing !== null) {\n\t\tvisited.put(context, existing);\n\t\treturn existing;\n\t}\n\tvar changed = false;\n\tvar parents = [];\n\tfor (var i = 0; i < parents.length; i++) {\n\t\tvar parent = getCachedPredictionContext(context.getParent(i), contextCache, visited);\n\t\tif (changed || parent !== context.getParent(i)) {\n\t\t\tif (!changed) {\n\t\t\t\tparents = [];\n\t\t\t\tfor (var j = 0; j < context.length; j++) {\n\t\t\t\t\tparents[j] = context.getParent(j);\n\t\t\t\t}\n\t\t\t\tchanged = true;\n\t\t\t}\n\t\t\tparents[i] = parent;\n\t\t}\n\t}\n\tif (!changed) {\n\t\tcontextCache.add(context);\n\t\tvisited.put(context, context);\n\t\treturn context;\n\t}\n\tvar updated = null;\n\tif (parents.length === 0) {\n\t\tupdated = PredictionContext.EMPTY;\n\t} else if (parents.length === 1) {\n\t\tupdated = SingletonPredictionContext.create(parents[0], context\n\t\t\t\t.getReturnState(0));\n\t} else {\n\t\tupdated = new ArrayPredictionContext(parents, context.returnStates);\n\t}\n\tcontextCache.add(updated);\n\tvisited.put(updated, updated);\n\tvisited.put(context, updated);\n\n\treturn updated;\n}\n\n// ter's recursive version of Sam's getAllNodes()\nfunction getAllContextNodes(context, nodes, visited) {\n\tif (nodes === null) {\n\t\tnodes = [];\n\t\treturn getAllContextNodes(context, nodes, visited);\n\t} else if (visited === null) {\n\t\tvisited = new Map();\n\t\treturn getAllContextNodes(context, nodes, visited);\n\t} else {\n\t\tif (context === null || visited.containsKey(context)) {\n\t\t\treturn nodes;\n\t\t}\n\t\tvisited.put(context, context);\n\t\tnodes.push(context);\n\t\tfor (var i = 0; i < context.length; i++) {\n\t\t\tgetAllContextNodes(context.getParent(i), nodes, visited);\n\t\t}\n\t\treturn nodes;\n\t}\n}\n\nexports.merge = merge;\nexports.PredictionContext = PredictionContext;\nexports.PredictionContextCache = PredictionContextCache;\nexports.SingletonPredictionContext = SingletonPredictionContext;\nexports.predictionContextFromRuleContext = predictionContextFromRuleContext;\nexports.getCachedPredictionContext = getCachedPredictionContext;\n","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n//\n\nvar Token = require('./Token').Token;\nvar ConsoleErrorListener = require('./error/ErrorListener').ConsoleErrorListener;\nvar ProxyErrorListener = require('./error/ErrorListener').ProxyErrorListener;\n\nfunction Recognizer() {\n    this._listeners = [ ConsoleErrorListener.INSTANCE ];\n    this._interp = null;\n    this._stateNumber = -1;\n    return this;\n}\n\nRecognizer.tokenTypeMapCache = {};\nRecognizer.ruleIndexMapCache = {};\n\n\nRecognizer.prototype.checkVersion = function(toolVersion) {\n    var runtimeVersion = \"4.8\";\n    if (runtimeVersion!==toolVersion) {\n        console.log(\"ANTLR runtime and generated code versions disagree: \"+runtimeVersion+\"!=\"+toolVersion);\n    }\n};\n\nRecognizer.prototype.addErrorListener = function(listener) {\n    this._listeners.push(listener);\n};\n\nRecognizer.prototype.removeErrorListeners = function() {\n    this._listeners = [];\n};\n\nRecognizer.prototype.getTokenTypeMap = function() {\n    var tokenNames = this.getTokenNames();\n    if (tokenNames===null) {\n        throw(\"The current recognizer does not provide a list of token names.\");\n    }\n    var result = this.tokenTypeMapCache[tokenNames];\n    if(result===undefined) {\n        result = tokenNames.reduce(function(o, k, i) { o[k] = i; });\n        result.EOF = Token.EOF;\n        this.tokenTypeMapCache[tokenNames] = result;\n    }\n    return result;\n};\n\n// Get a map from rule names to rule indexes.\n//\n// <p>Used for XPath and tree pattern compilation.</p>\n//\nRecognizer.prototype.getRuleIndexMap = function() {\n    var ruleNames = this.ruleNames;\n    if (ruleNames===null) {\n        throw(\"The current recognizer does not provide a list of rule names.\");\n    }\n    var result = this.ruleIndexMapCache[ruleNames];\n    if(result===undefined) {\n        result = ruleNames.reduce(function(o, k, i) { o[k] = i; });\n        this.ruleIndexMapCache[ruleNames] = result;\n    }\n    return result;\n};\n\nRecognizer.prototype.getTokenType = function(tokenName) {\n    var ttype = this.getTokenTypeMap()[tokenName];\n    if (ttype !==undefined) {\n        return ttype;\n    } else {\n        return Token.INVALID_TYPE;\n    }\n};\n\n\n// What is the error header, normally line/character position information?//\nRecognizer.prototype.getErrorHeader = function(e) {\n    var line = e.getOffendingToken().line;\n    var column = e.getOffendingToken().column;\n    return \"line \" + line + \":\" + column;\n};\n\n\n// How should a token be displayed in an error message? The default\n//  is to display just the text, but during development you might\n//  want to have a lot of information spit out.  Override in that case\n//  to use t.toString() (which, for CommonToken, dumps everything about\n//  the token). This is better than forcing you to override a method in\n//  your token objects because you don't have to go modify your lexer\n//  so that it creates a new Java type.\n//\n// @deprecated This method is not called by the ANTLR 4 Runtime. Specific\n// implementations of {@link ANTLRErrorStrategy} may provide a similar\n// feature when necessary. For example, see\n// {@link DefaultErrorStrategy//getTokenErrorDisplay}.\n//\nRecognizer.prototype.getTokenErrorDisplay = function(t) {\n    if (t===null) {\n        return \"<no token>\";\n    }\n    var s = t.text;\n    if (s===null) {\n        if (t.type===Token.EOF) {\n            s = \"<EOF>\";\n        } else {\n            s = \"<\" + t.type + \">\";\n        }\n    }\n    s = s.replace(\"\\n\",\"\\\\n\").replace(\"\\r\",\"\\\\r\").replace(\"\\t\",\"\\\\t\");\n    return \"'\" + s + \"'\";\n};\n\nRecognizer.prototype.getErrorListenerDispatch = function() {\n    return new ProxyErrorListener(this._listeners);\n};\n\n// subclass needs to override these if there are sempreds or actions\n// that the ATN interp needs to execute\nRecognizer.prototype.sempred = function(localctx, ruleIndex, actionIndex) {\n    return true;\n};\n\nRecognizer.prototype.precpred = function(localctx , precedence) {\n    return true;\n};\n\n//Indicate that the recognizer has changed internal state that is\n//consistent with the ATN state passed in.  This way we always know\n//where we are in the ATN as the parser goes along. The rule\n//context objects form a stack that lets us see the stack of\n//invoking rules. Combine this and we have complete ATN\n//configuration information.\n\nObject.defineProperty(Recognizer.prototype, \"state\", {\n\tget : function() {\n\t\treturn this._stateNumber;\n\t},\n\tset : function(state) {\n\t\tthis._stateNumber = state;\n\t}\n});\n\n\nexports.Recognizer = Recognizer;\n","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n///\n\n//  A rule context is a record of a single rule invocation. It knows\n//  which context invoked it, if any. If there is no parent context, then\n//  naturally the invoking state is not valid.  The parent link\n//  provides a chain upwards from the current rule invocation to the root\n//  of the invocation tree, forming a stack. We actually carry no\n//  information about the rule associated with this context (except\n//  when parsing). We keep only the state number of the invoking state from\n//  the ATN submachine that invoked this. Contrast this with the s\n//  pointer inside ParserRuleContext that tracks the current state\n//  being \"executed\" for the current rule.\n//\n//  The parent contexts are useful for computing lookahead sets and\n//  getting error information.\n//\n//  These objects are used during parsing and prediction.\n//  For the special case of parsers, we use the subclass\n//  ParserRuleContext.\n//\n//  @see ParserRuleContext\n///\n\nvar RuleNode = require('./tree/Tree').RuleNode;\nvar INVALID_INTERVAL = require('./tree/Tree').INVALID_INTERVAL;\nvar INVALID_ALT_NUMBER = require('./atn/ATN').INVALID_ALT_NUMBER;\n\nfunction RuleContext(parent, invokingState) {\n\tRuleNode.call(this);\n\t// What context invoked this rule?\n\tthis.parentCtx = parent || null;\n\t// What state invoked the rule associated with this context?\n\t// The \"return address\" is the followState of invokingState\n\t// If parent is null, this should be -1.\n\tthis.invokingState = invokingState || -1;\n\treturn this;\n}\n\nRuleContext.prototype = Object.create(RuleNode.prototype);\nRuleContext.prototype.constructor = RuleContext;\n\nRuleContext.prototype.depth = function() {\n\tvar n = 0;\n\tvar p = this;\n\twhile (p !== null) {\n\t\tp = p.parentCtx;\n\t\tn += 1;\n\t}\n\treturn n;\n};\n\n// A context is empty if there is no invoking state; meaning nobody call\n// current context.\nRuleContext.prototype.isEmpty = function() {\n\treturn this.invokingState === -1;\n};\n\n// satisfy the ParseTree / SyntaxTree interface\n\nRuleContext.prototype.getSourceInterval = function() {\n\treturn INVALID_INTERVAL;\n};\n\nRuleContext.prototype.getRuleContext = function() {\n\treturn this;\n};\n\nRuleContext.prototype.getPayload = function() {\n\treturn this;\n};\n\n// Return the combined text of all child nodes. This method only considers\n// tokens which have been added to the parse tree.\n// <p>\n// Since tokens on hidden channels (e.g. whitespace or comments) are not\n// added to the parse trees, they will not appear in the output of this\n// method.\n// /\nRuleContext.prototype.getText = function() {\n\tif (this.getChildCount() === 0) {\n\t\treturn \"\";\n\t} else {\n\t\treturn this.children.map(function(child) {\n\t\t\treturn child.getText();\n\t\t}).join(\"\");\n\t}\n};\n\n// For rule associated with this parse tree internal node, return\n// the outer alternative number used to match the input. Default\n// implementation does not compute nor store this alt num. Create\n// a subclass of ParserRuleContext with backing field and set\n// option contextSuperClass.\n// to set it.\nRuleContext.prototype.getAltNumber = function() { return INVALID_ALT_NUMBER; }\n\n// Set the outer alternative number for this context node. Default\n// implementation does nothing to avoid backing field overhead for\n// trees that don't need it.  Create\n// a subclass of ParserRuleContext with backing field and set\n// option contextSuperClass.\nRuleContext.prototype.setAltNumber = function(altNumber) { }\n\nRuleContext.prototype.getChild = function(i) {\n\treturn null;\n};\n\nRuleContext.prototype.getChildCount = function() {\n\treturn 0;\n};\n\nRuleContext.prototype.accept = function(visitor) {\n\treturn visitor.visitChildren(this);\n};\n\n//need to manage circular dependencies, so export now\nexports.RuleContext = RuleContext;\nvar Trees = require('./tree/Trees').Trees;\n\n\n// Print out a whole tree, not just a node, in LISP format\n// (root child1 .. childN). Print just a node if this is a leaf.\n//\n\nRuleContext.prototype.toStringTree = function(ruleNames, recog) {\n\treturn Trees.toStringTree(this, ruleNames, recog);\n};\n\nRuleContext.prototype.toString = function(ruleNames, stop) {\n\truleNames = ruleNames || null;\n\tstop = stop || null;\n\tvar p = this;\n\tvar s = \"[\";\n\twhile (p !== null && p !== stop) {\n\t\tif (ruleNames === null) {\n\t\t\tif (!p.isEmpty()) {\n\t\t\t\ts += p.invokingState;\n\t\t\t}\n\t\t} else {\n\t\t\tvar ri = p.ruleIndex;\n\t\t\tvar ruleName = (ri >= 0 && ri < ruleNames.length) ? ruleNames[ri]\n\t\t\t\t\t: \"\" + ri;\n\t\t\ts += ruleName;\n\t\t}\n\t\tif (p.parentCtx !== null && (ruleNames !== null || !p.parentCtx.isEmpty())) {\n\t\t\ts += \" \";\n\t\t}\n\t\tp = p.parentCtx;\n\t}\n\ts += \"]\";\n\treturn s;\n};\n\n","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n//\n\n// A token has properties: text, type, line, character position in the line\n// (so we can ignore tabs), token channel, index, and source from which\n// we obtained this token.\n\nfunction Token() {\n\tthis.source = null;\n\tthis.type = null; // token type of the token\n\tthis.channel = null; // The parser ignores everything not on DEFAULT_CHANNEL\n\tthis.start = null; // optional; return -1 if not implemented.\n\tthis.stop = null; // optional; return -1 if not implemented.\n\tthis.tokenIndex = null; // from 0..n-1 of the token object in the input stream\n\tthis.line = null; // line=1..n of the 1st character\n\tthis.column = null; // beginning of the line at which it occurs, 0..n-1\n\tthis._text = null; // text of the token.\n\treturn this;\n}\n\nToken.INVALID_TYPE = 0;\n\n// During lookahead operations, this \"token\" signifies we hit rule end ATN state\n// and did not follow it despite needing to.\nToken.EPSILON = -2;\n\nToken.MIN_USER_TOKEN_TYPE = 1;\n\nToken.EOF = -1;\n\n// All tokens go to the parser (unless skip() is called in that rule)\n// on a particular \"channel\". The parser tunes to a particular channel\n// so that whitespace etc... can go to the parser on a \"hidden\" channel.\n\nToken.DEFAULT_CHANNEL = 0;\n\n// Anything on different channel than DEFAULT_CHANNEL is not parsed\n// by parser.\n\nToken.HIDDEN_CHANNEL = 1;\n\n// Explicitly set the text for this token. If {code text} is not\n// {@code null}, then {@link //getText} will return this value rather than\n// extracting the text from the input.\n//\n// @param text The explicit text of the token, or {@code null} if the text\n// should be obtained from the input along with the start and stop indexes\n// of the token.\n\nObject.defineProperty(Token.prototype, \"text\", {\n\tget : function() {\n\t\treturn this._text;\n\t},\n\tset : function(text) {\n\t\tthis._text = text;\n\t}\n});\n\nToken.prototype.getTokenSource = function() {\n\treturn this.source[0];\n};\n\nToken.prototype.getInputStream = function() {\n\treturn this.source[1];\n};\n\nfunction CommonToken(source, type, channel, start, stop) {\n\tToken.call(this);\n\tthis.source = source !== undefined ? source : CommonToken.EMPTY_SOURCE;\n\tthis.type = type !== undefined ? type : null;\n\tthis.channel = channel !== undefined ? channel : Token.DEFAULT_CHANNEL;\n\tthis.start = start !== undefined ? start : -1;\n\tthis.stop = stop !== undefined ? stop : -1;\n\tthis.tokenIndex = -1;\n\tif (this.source[0] !== null) {\n\t\tthis.line = source[0].line;\n\t\tthis.column = source[0].column;\n\t} else {\n\t\tthis.column = -1;\n\t}\n\treturn this;\n}\n\nCommonToken.prototype = Object.create(Token.prototype);\nCommonToken.prototype.constructor = CommonToken;\n\n// An empty {@link Pair} which is used as the default value of\n// {@link //source} for tokens that do not have a source.\nCommonToken.EMPTY_SOURCE = [ null, null ];\n\n// Constructs a new {@link CommonToken} as a copy of another {@link Token}.\n//\n// <p>\n// If {@code oldToken} is also a {@link CommonToken} instance, the newly\n// constructed token will share a reference to the {@link //text} field and\n// the {@link Pair} stored in {@link //source}. Otherwise, {@link //text} will\n// be assigned the result of calling {@link //getText}, and {@link //source}\n// will be constructed from the result of {@link Token//getTokenSource} and\n// {@link Token//getInputStream}.</p>\n//\n// @param oldToken The token to copy.\n//\nCommonToken.prototype.clone = function() {\n\tvar t = new CommonToken(this.source, this.type, this.channel, this.start,\n\t\t\tthis.stop);\n\tt.tokenIndex = this.tokenIndex;\n\tt.line = this.line;\n\tt.column = this.column;\n\tt.text = this.text;\n\treturn t;\n};\n\nObject.defineProperty(CommonToken.prototype, \"text\", {\n\tget : function() {\n\t\tif (this._text !== null) {\n\t\t\treturn this._text;\n\t\t}\n\t\tvar input = this.getInputStream();\n\t\tif (input === null) {\n\t\t\treturn null;\n\t\t}\n\t\tvar n = input.size;\n\t\tif (this.start < n && this.stop < n) {\n\t\t\treturn input.getText(this.start, this.stop);\n\t\t} else {\n\t\t\treturn \"<EOF>\";\n\t\t}\n\t},\n\tset : function(text) {\n\t\tthis._text = text;\n\t}\n});\n\nCommonToken.prototype.toString = function() {\n\tvar txt = this.text;\n\tif (txt !== null) {\n\t\ttxt = txt.replace(/\\n/g, \"\\\\n\").replace(/\\r/g, \"\\\\r\").replace(/\\t/g, \"\\\\t\");\n\t} else {\n\t\ttxt = \"<no text>\";\n\t}\n\treturn \"[@\" + this.tokenIndex + \",\" + this.start + \":\" + this.stop + \"='\" +\n\t\t\ttxt + \"',<\" + this.type + \">\" +\n\t\t\t(this.channel > 0 ? \",channel=\" + this.channel : \"\") + \",\" +\n\t\t\tthis.line + \":\" + this.column + \"]\";\n};\n\nexports.Token = Token;\nexports.CommonToken = CommonToken;\n","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n\nfunction arrayToString(a) {\n    return \"[\" + a.join(\", \") + \"]\";\n}\n\nString.prototype.seed = String.prototype.seed || Math.round(Math.random() * Math.pow(2, 32));\n\nString.prototype.hashCode = function () {\n    var remainder, bytes, h1, h1b, c1, c1b, c2, c2b, k1, i,\n        key = this.toString();\n\n    remainder = key.length & 3; // key.length % 4\n    bytes = key.length - remainder;\n    h1 = String.prototype.seed;\n    c1 = 0xcc9e2d51;\n    c2 = 0x1b873593;\n    i = 0;\n\n    while (i < bytes) {\n        k1 =\n            ((key.charCodeAt(i) & 0xff)) |\n            ((key.charCodeAt(++i) & 0xff) << 8) |\n            ((key.charCodeAt(++i) & 0xff) << 16) |\n            ((key.charCodeAt(++i) & 0xff) << 24);\n        ++i;\n\n        k1 = ((((k1 & 0xffff) * c1) + ((((k1 >>> 16) * c1) & 0xffff) << 16))) & 0xffffffff;\n        k1 = (k1 << 15) | (k1 >>> 17);\n        k1 = ((((k1 & 0xffff) * c2) + ((((k1 >>> 16) * c2) & 0xffff) << 16))) & 0xffffffff;\n\n        h1 ^= k1;\n        h1 = (h1 << 13) | (h1 >>> 19);\n        h1b = ((((h1 & 0xffff) * 5) + ((((h1 >>> 16) * 5) & 0xffff) << 16))) & 0xffffffff;\n        h1 = (((h1b & 0xffff) + 0x6b64) + ((((h1b >>> 16) + 0xe654) & 0xffff) << 16));\n    }\n\n    k1 = 0;\n\n    switch (remainder) {\n        case 3:\n            k1 ^= (key.charCodeAt(i + 2) & 0xff) << 16;\n        case 2:\n            k1 ^= (key.charCodeAt(i + 1) & 0xff) << 8;\n        case 1:\n            k1 ^= (key.charCodeAt(i) & 0xff);\n\n            k1 = (((k1 & 0xffff) * c1) + ((((k1 >>> 16) * c1) & 0xffff) << 16)) & 0xffffffff;\n            k1 = (k1 << 15) | (k1 >>> 17);\n            k1 = (((k1 & 0xffff) * c2) + ((((k1 >>> 16) * c2) & 0xffff) << 16)) & 0xffffffff;\n            h1 ^= k1;\n    }\n\n    h1 ^= key.length;\n\n    h1 ^= h1 >>> 16;\n    h1 = (((h1 & 0xffff) * 0x85ebca6b) + ((((h1 >>> 16) * 0x85ebca6b) & 0xffff) << 16)) & 0xffffffff;\n    h1 ^= h1 >>> 13;\n    h1 = ((((h1 & 0xffff) * 0xc2b2ae35) + ((((h1 >>> 16) * 0xc2b2ae35) & 0xffff) << 16))) & 0xffffffff;\n    h1 ^= h1 >>> 16;\n\n    return h1 >>> 0;\n};\n\nfunction standardEqualsFunction(a, b) {\n    return a.equals(b);\n}\n\nfunction standardHashCodeFunction(a) {\n    return a.hashCode();\n}\n\nfunction Set(hashFunction, equalsFunction) {\n    this.data = {};\n    this.hashFunction = hashFunction || standardHashCodeFunction;\n    this.equalsFunction = equalsFunction || standardEqualsFunction;\n    return this;\n}\n\nObject.defineProperty(Set.prototype, \"length\", {\n    get: function () {\n        var l = 0;\n        for (var key in this.data) {\n            if (key.indexOf(\"hash_\") === 0) {\n                l = l + this.data[key].length;\n            }\n        }\n        return l;\n    }\n});\n\nSet.prototype.add = function (value) {\n    var hash = this.hashFunction(value);\n    var key = \"hash_\" + hash;\n    if (key in this.data) {\n        var values = this.data[key];\n        for (var i = 0; i < values.length; i++) {\n            if (this.equalsFunction(value, values[i])) {\n                return values[i];\n            }\n        }\n        values.push(value);\n        return value;\n    } else {\n        this.data[key] = [value];\n        return value;\n    }\n};\n\nSet.prototype.contains = function (value) {\n    return this.get(value) != null;\n};\n\nSet.prototype.get = function (value) {\n    var hash = this.hashFunction(value);\n    var key = \"hash_\" + hash;\n    if (key in this.data) {\n        var values = this.data[key];\n        for (var i = 0; i < values.length; i++) {\n            if (this.equalsFunction(value, values[i])) {\n                return values[i];\n            }\n        }\n    }\n    return null;\n};\n\nSet.prototype.values = function () {\n    var l = [];\n    for (var key in this.data) {\n        if (key.indexOf(\"hash_\") === 0) {\n            l = l.concat(this.data[key]);\n        }\n    }\n    return l;\n};\n\nSet.prototype.toString = function () {\n    return arrayToString(this.values());\n};\n\nfunction BitSet() {\n    this.data = [];\n    return this;\n}\n\nBitSet.prototype.add = function (value) {\n    this.data[value] = true;\n};\n\nBitSet.prototype.or = function (set) {\n    var bits = this;\n    Object.keys(set.data).map(function (alt) {\n        bits.add(alt);\n    });\n};\n\nBitSet.prototype.remove = function (value) {\n    delete this.data[value];\n};\n\nBitSet.prototype.contains = function (value) {\n    return this.data[value] === true;\n};\n\nBitSet.prototype.values = function () {\n    return Object.keys(this.data);\n};\n\nBitSet.prototype.minValue = function () {\n    return Math.min.apply(null, this.values());\n};\n\nBitSet.prototype.hashCode = function () {\n    var hash = new Hash();\n    hash.update(this.values());\n    return hash.finish();\n};\n\nBitSet.prototype.equals = function (other) {\n    if (!(other instanceof BitSet)) {\n        return false;\n    }\n    return this.hashCode() === other.hashCode();\n};\n\nObject.defineProperty(BitSet.prototype, \"length\", {\n    get: function () {\n        return this.values().length;\n    }\n});\n\nBitSet.prototype.toString = function () {\n    return \"{\" + this.values().join(\", \") + \"}\";\n};\n\nfunction Map(hashFunction, equalsFunction) {\n    this.data = {};\n    this.hashFunction = hashFunction || standardHashCodeFunction;\n    this.equalsFunction = equalsFunction || standardEqualsFunction;\n    return this;\n}\n\nObject.defineProperty(Map.prototype, \"length\", {\n    get: function () {\n        var l = 0;\n        for (var hashKey in this.data) {\n            if (hashKey.indexOf(\"hash_\") === 0) {\n                l = l + this.data[hashKey].length;\n            }\n        }\n        return l;\n    }\n});\n\nMap.prototype.put = function (key, value) {\n    var hashKey = \"hash_\" + this.hashFunction(key);\n    if (hashKey in this.data) {\n        var entries = this.data[hashKey];\n        for (var i = 0; i < entries.length; i++) {\n            var entry = entries[i];\n            if (this.equalsFunction(key, entry.key)) {\n                var oldValue = entry.value;\n                entry.value = value;\n                return oldValue;\n            }\n        }\n        entries.push({key:key, value:value});\n        return value;\n    } else {\n        this.data[hashKey] = [{key:key, value:value}];\n        return value;\n    }\n};\n\nMap.prototype.containsKey = function (key) {\n    var hashKey = \"hash_\" + this.hashFunction(key);\n    if(hashKey in this.data) {\n        var entries = this.data[hashKey];\n        for (var i = 0; i < entries.length; i++) {\n            var entry = entries[i];\n            if (this.equalsFunction(key, entry.key))\n                return true;\n        }\n    }\n    return false;\n};\n\nMap.prototype.get = function (key) {\n    var hashKey = \"hash_\" + this.hashFunction(key);\n    if(hashKey in this.data) {\n        var entries = this.data[hashKey];\n        for (var i = 0; i < entries.length; i++) {\n            var entry = entries[i];\n            if (this.equalsFunction(key, entry.key))\n                return entry.value;\n        }\n    }\n    return null;\n};\n\nMap.prototype.entries = function () {\n    var l = [];\n    for (var key in this.data) {\n        if (key.indexOf(\"hash_\") === 0) {\n            l = l.concat(this.data[key]);\n        }\n    }\n    return l;\n};\n\n\nMap.prototype.getKeys = function () {\n    return this.entries().map(function(e) {\n        return e.key;\n    });\n};\n\n\nMap.prototype.getValues = function () {\n    return this.entries().map(function(e) {\n            return e.value;\n    });\n};\n\n\nMap.prototype.toString = function () {\n    var ss = this.entries().map(function(entry) {\n        return '{' + entry.key + ':' + entry.value + '}';\n    });\n    return '[' + ss.join(\", \") + ']';\n};\n\n\nfunction AltDict() {\n    this.data = {};\n    return this;\n}\n\n\nAltDict.prototype.get = function (key) {\n    key = \"k-\" + key;\n    if (key in this.data) {\n        return this.data[key];\n    } else {\n        return null;\n    }\n};\n\nAltDict.prototype.put = function (key, value) {\n    key = \"k-\" + key;\n    this.data[key] = value;\n};\n\nAltDict.prototype.values = function () {\n    var data = this.data;\n    var keys = Object.keys(this.data);\n    return keys.map(function (key) {\n        return data[key];\n    });\n};\n\nfunction DoubleDict(defaultMapCtor) {\n    this.defaultMapCtor = defaultMapCtor || Map;\n    this.cacheMap = new this.defaultMapCtor();\n    return this;\n}\n\nfunction Hash() {\n    this.count = 0;\n    this.hash = 0;\n    return this;\n}\n\nHash.prototype.update = function () {\n    for(var i=0;i<arguments.length;i++) {\n        var value = arguments[i];\n        if (value == null)\n            continue;\n        if(Array.isArray(value))\n            this.update.apply(this, value);\n        else {\n            var k = 0;\n            switch (typeof(value)) {\n                case 'undefined':\n                case 'function':\n                    continue;\n                case 'number':\n                case 'boolean':\n                    k = value;\n                    break;\n                case 'string':\n                    k = value.hashCode();\n                    break;\n                default:\n                    if(value.updateHashCode)\n                        value.updateHashCode(this);\n                    else\n                        console.log(\"No updateHashCode for \" + value.toString())\n                    continue;\n            }\n            k = k * 0xCC9E2D51;\n            k = (k << 15) | (k >>> (32 - 15));\n            k = k * 0x1B873593;\n            this.count = this.count + 1;\n            var hash = this.hash ^ k;\n            hash = (hash << 13) | (hash >>> (32 - 13));\n            hash = hash * 5 + 0xE6546B64;\n            this.hash = hash;\n        }\n    }\n};\n\nHash.prototype.finish = function () {\n    var hash = this.hash ^ (this.count * 4);\n    hash = hash ^ (hash >>> 16);\n    hash = hash * 0x85EBCA6B;\n    hash = hash ^ (hash >>> 13);\n    hash = hash * 0xC2B2AE35;\n    hash = hash ^ (hash >>> 16);\n    return hash;\n};\n\nfunction hashStuff() {\n    var hash = new Hash();\n    hash.update.apply(hash, arguments);\n    return hash.finish();\n}\n\nDoubleDict.prototype.get = function (a, b) {\n    var d = this.cacheMap.get(a) || null;\n    return d === null ? null : (d.get(b) || null);\n};\n\nDoubleDict.prototype.set = function (a, b, o) {\n    var d = this.cacheMap.get(a) || null;\n    if (d === null) {\n        d = new this.defaultMapCtor();\n        this.cacheMap.put(a, d);\n    }\n    d.put(b, o);\n};\n\n\nfunction escapeWhitespace(s, escapeSpaces) {\n    s = s.replace(/\\t/g, \"\\\\t\")\n         .replace(/\\n/g, \"\\\\n\")\n         .replace(/\\r/g, \"\\\\r\");\n    if (escapeSpaces) {\n        s = s.replace(/ /g, \"\\u00B7\");\n    }\n    return s;\n}\n\nfunction titleCase(str) {\n    return str.replace(/\\w\\S*/g, function (txt) {\n        return txt.charAt(0).toUpperCase() + txt.substr(1);\n    });\n};\n\nfunction equalArrays(a, b)\n{\n    if (!Array.isArray(a) || !Array.isArray(b))\n        return false;\n    if (a == b)\n        return true;\n    if (a.length != b.length)\n        return false;\n    for (var i = 0; i < a.length; i++) {\n        if (a[i] == b[i])\n            continue;\n        if (!a[i].equals(b[i]))\n            return false;\n    }\n    return true;\n};\n\nexports.Hash = Hash;\nexports.Set = Set;\nexports.Map = Map;\nexports.BitSet = BitSet;\nexports.AltDict = AltDict;\nexports.DoubleDict = DoubleDict;\nexports.hashStuff = hashStuff;\nexports.escapeWhitespace = escapeWhitespace;\nexports.arrayToString = arrayToString;\nexports.titleCase = titleCase;\nexports.equalArrays = equalArrays;\n","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n\nvar LL1Analyzer = require('./../LL1Analyzer').LL1Analyzer;\nvar IntervalSet = require('./../IntervalSet').IntervalSet;\n\nfunction ATN(grammarType , maxTokenType) {\n\n    // Used for runtime deserialization of ATNs from strings///\n    // The type of the ATN.\n    this.grammarType = grammarType;\n    // The maximum value for any symbol recognized by a transition in the ATN.\n    this.maxTokenType = maxTokenType;\n    this.states = [];\n    // Each subrule/rule is a decision point and we must track them so we\n    //  can go back later and build DFA predictors for them.  This includes\n    //  all the rules, subrules, optional blocks, ()+, ()* etc...\n    this.decisionToState = [];\n    // Maps from rule index to starting state number.\n    this.ruleToStartState = [];\n    // Maps from rule index to stop state number.\n    this.ruleToStopState = null;\n    this.modeNameToStartState = {};\n    // For lexer ATNs, this maps the rule index to the resulting token type.\n    // For parser ATNs, this maps the rule index to the generated bypass token\n    // type if the\n    // {@link ATNDeserializationOptions//isGenerateRuleBypassTransitions}\n    // deserialization option was specified; otherwise, this is {@code null}.\n    this.ruleToTokenType = null;\n    // For lexer ATNs, this is an array of {@link LexerAction} objects which may\n    // be referenced by action transitions in the ATN.\n    this.lexerActions = null;\n    this.modeToStartState = [];\n\n    return this;\n}\n\n// Compute the set of valid tokens that can occur starting in state {@code s}.\n//  If {@code ctx} is null, the set of tokens will not include what can follow\n//  the rule surrounding {@code s}. In other words, the set will be\n//  restricted to tokens reachable staying within {@code s}'s rule.\nATN.prototype.nextTokensInContext = function(s, ctx) {\n    var anal = new LL1Analyzer(this);\n    return anal.LOOK(s, null, ctx);\n};\n\n// Compute the set of valid tokens that can occur starting in {@code s} and\n// staying in same rule. {@link Token//EPSILON} is in set if we reach end of\n// rule.\nATN.prototype.nextTokensNoContext = function(s) {\n    if (s.nextTokenWithinRule !== null ) {\n        return s.nextTokenWithinRule;\n    }\n    s.nextTokenWithinRule = this.nextTokensInContext(s, null);\n    s.nextTokenWithinRule.readOnly = true;\n    return s.nextTokenWithinRule;\n};\n\nATN.prototype.nextTokens = function(s, ctx) {\n    if ( ctx===undefined ) {\n        return this.nextTokensNoContext(s);\n    } else {\n        return this.nextTokensInContext(s, ctx);\n    }\n};\n\nATN.prototype.addState = function( state) {\n    if ( state !== null ) {\n        state.atn = this;\n        state.stateNumber = this.states.length;\n    }\n    this.states.push(state);\n};\n\nATN.prototype.removeState = function( state) {\n    this.states[state.stateNumber] = null; // just free mem, don't shift states in list\n};\n\nATN.prototype.defineDecisionState = function( s) {\n    this.decisionToState.push(s);\n    s.decision = this.decisionToState.length-1;\n    return s.decision;\n};\n\nATN.prototype.getDecisionState = function( decision) {\n    if (this.decisionToState.length===0) {\n        return null;\n    } else {\n        return this.decisionToState[decision];\n    }\n};\n\n// Computes the set of input symbols which could follow ATN state number\n// {@code stateNumber} in the specified full {@code context}. This method\n// considers the complete parser context, but does not evaluate semantic\n// predicates (i.e. all predicates encountered during the calculation are\n// assumed true). If a path in the ATN exists from the starting state to the\n// {@link RuleStopState} of the outermost context without matching any\n// symbols, {@link Token//EOF} is added to the returned set.\n//\n// <p>If {@code context} is {@code null}, it is treated as\n// {@link ParserRuleContext//EMPTY}.</p>\n//\n// @param stateNumber the ATN state number\n// @param context the full parse context\n// @return The set of potentially valid input symbols which could follow the\n// specified state in the specified context.\n// @throws IllegalArgumentException if the ATN does not contain a state with\n// number {@code stateNumber}\nvar Token = require('./../Token').Token;\n\nATN.prototype.getExpectedTokens = function( stateNumber, ctx ) {\n    if ( stateNumber < 0 || stateNumber >= this.states.length ) {\n        throw(\"Invalid state number.\");\n    }\n    var s = this.states[stateNumber];\n    var following = this.nextTokens(s);\n    if (!following.contains(Token.EPSILON)) {\n        return following;\n    }\n    var expected = new IntervalSet();\n    expected.addSet(following);\n    expected.removeOne(Token.EPSILON);\n    while (ctx !== null && ctx.invokingState >= 0 && following.contains(Token.EPSILON)) {\n        var invokingState = this.states[ctx.invokingState];\n        var rt = invokingState.transitions[0];\n        following = this.nextTokens(rt.followState);\n        expected.addSet(following);\n        expected.removeOne(Token.EPSILON);\n        ctx = ctx.parentCtx;\n    }\n    if (following.contains(Token.EPSILON)) {\n        expected.addOne(Token.EOF);\n    }\n    return expected;\n};\n\nATN.INVALID_ALT_NUMBER = 0;\n\nexports.ATN = ATN;","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n///\n\n// A tuple: (ATN state, predicted alt, syntactic, semantic context).\n//  The syntactic context is a graph-structured stack node whose\n//  path(s) to the root is the rule invocation(s)\n//  chain used to arrive at the state.  The semantic context is\n//  the tree of semantic predicates encountered before reaching\n//  an ATN state.\n///\n\nvar DecisionState = require('./ATNState').DecisionState;\nvar SemanticContext = require('./SemanticContext').SemanticContext;\nvar Hash = require(\"../Utils\").Hash;\n\n\nfunction checkParams(params, isCfg) {\n\tif(params===null) {\n\t\tvar result = { state:null, alt:null, context:null, semanticContext:null };\n\t\tif(isCfg) {\n\t\t\tresult.reachesIntoOuterContext = 0;\n\t\t}\n\t\treturn result;\n\t} else {\n\t\tvar props = {};\n\t\tprops.state = params.state || null;\n\t\tprops.alt = (params.alt === undefined) ? null : params.alt;\n\t\tprops.context = params.context || null;\n\t\tprops.semanticContext = params.semanticContext || null;\n\t\tif(isCfg) {\n\t\t\tprops.reachesIntoOuterContext = params.reachesIntoOuterContext || 0;\n\t\t\tprops.precedenceFilterSuppressed = params.precedenceFilterSuppressed || false;\n\t\t}\n\t\treturn props;\n\t}\n}\n\nfunction ATNConfig(params, config) {\n\tthis.checkContext(params, config);\n\tparams = checkParams(params);\n\tconfig = checkParams(config, true);\n    // The ATN state associated with this configuration///\n    this.state = params.state!==null ? params.state : config.state;\n    // What alt (or lexer rule) is predicted by this configuration///\n    this.alt = params.alt!==null ? params.alt : config.alt;\n    // The stack of invoking states leading to the rule/states associated\n    //  with this config.  We track only those contexts pushed during\n    //  execution of the ATN simulator.\n    this.context = params.context!==null ? params.context : config.context;\n    this.semanticContext = params.semanticContext!==null ? params.semanticContext :\n        (config.semanticContext!==null ? config.semanticContext : SemanticContext.NONE);\n    // We cannot execute predicates dependent upon local context unless\n    // we know for sure we are in the correct context. Because there is\n    // no way to do this efficiently, we simply cannot evaluate\n    // dependent predicates unless we are in the rule that initially\n    // invokes the ATN simulator.\n    //\n    // closure() tracks the depth of how far we dip into the\n    // outer context: depth &gt; 0.  Note that it may not be totally\n    // accurate depth since I don't ever decrement. TODO: make it a boolean then\n    this.reachesIntoOuterContext = config.reachesIntoOuterContext;\n    this.precedenceFilterSuppressed = config.precedenceFilterSuppressed;\n    return this;\n}\n\nATNConfig.prototype.checkContext = function(params, config) {\n\tif((params.context===null || params.context===undefined) &&\n\t\t\t(config===null || config.context===null || config.context===undefined)) {\n\t\tthis.context = null;\n\t}\n};\n\n\nATNConfig.prototype.hashCode = function() {\n    var hash = new Hash();\n    this.updateHashCode(hash);\n    return hash.finish();\n};\n\n\nATNConfig.prototype.updateHashCode = function(hash) {\n    hash.update(this.state.stateNumber, this.alt, this.context, this.semanticContext);\n};\n\n// An ATN configuration is equal to another if both have\n//  the same state, they predict the same alternative, and\n//  syntactic/semantic contexts are the same.\n\nATNConfig.prototype.equals = function(other) {\n    if (this === other) {\n        return true;\n    } else if (! (other instanceof ATNConfig)) {\n        return false;\n    } else {\n        return this.state.stateNumber===other.state.stateNumber &&\n            this.alt===other.alt &&\n            (this.context===null ? other.context===null : this.context.equals(other.context)) &&\n            this.semanticContext.equals(other.semanticContext) &&\n            this.precedenceFilterSuppressed===other.precedenceFilterSuppressed;\n    }\n};\n\n\nATNConfig.prototype.hashCodeForConfigSet = function() {\n    var hash = new Hash();\n    hash.update(this.state.stateNumber, this.alt, this.semanticContext);\n    return hash.finish();\n};\n\n\nATNConfig.prototype.equalsForConfigSet = function(other) {\n    if (this === other) {\n        return true;\n    } else if (! (other instanceof ATNConfig)) {\n        return false;\n    } else {\n        return this.state.stateNumber===other.state.stateNumber &&\n            this.alt===other.alt &&\n            this.semanticContext.equals(other.semanticContext);\n    }\n};\n\n\nATNConfig.prototype.toString = function() {\n    return \"(\" + this.state + \",\" + this.alt +\n        (this.context!==null ? \",[\" + this.context.toString() + \"]\" : \"\") +\n        (this.semanticContext !== SemanticContext.NONE ?\n                (\",\" + this.semanticContext.toString())\n                : \"\") +\n        (this.reachesIntoOuterContext>0 ?\n                (\",up=\" + this.reachesIntoOuterContext)\n                : \"\") + \")\";\n};\n\n\nfunction LexerATNConfig(params, config) {\n\tATNConfig.call(this, params, config);\n\n    // This is the backing field for {@link //getLexerActionExecutor}.\n\tvar lexerActionExecutor = params.lexerActionExecutor || null;\n    this.lexerActionExecutor = lexerActionExecutor || (config!==null ? config.lexerActionExecutor : null);\n    this.passedThroughNonGreedyDecision = config!==null ? this.checkNonGreedyDecision(config, this.state) : false;\n    return this;\n}\n\nLexerATNConfig.prototype = Object.create(ATNConfig.prototype);\nLexerATNConfig.prototype.constructor = LexerATNConfig;\n\nLexerATNConfig.prototype.updateHashCode = function(hash) {\n    hash.update(this.state.stateNumber, this.alt, this.context, this.semanticContext, this.passedThroughNonGreedyDecision, this.lexerActionExecutor);\n};\n\nLexerATNConfig.prototype.equals = function(other) {\n    return this === other ||\n            (other instanceof LexerATNConfig &&\n            this.passedThroughNonGreedyDecision == other.passedThroughNonGreedyDecision &&\n            (this.lexerActionExecutor ? this.lexerActionExecutor.equals(other.lexerActionExecutor) : !other.lexerActionExecutor) &&\n            ATNConfig.prototype.equals.call(this, other));\n};\n\nLexerATNConfig.prototype.hashCodeForConfigSet = LexerATNConfig.prototype.hashCode;\n\nLexerATNConfig.prototype.equalsForConfigSet = LexerATNConfig.prototype.equals;\n\n\nLexerATNConfig.prototype.checkNonGreedyDecision = function(source, target) {\n    return source.passedThroughNonGreedyDecision ||\n        (target instanceof DecisionState) && target.nonGreedy;\n};\n\nexports.ATNConfig = ATNConfig;\nexports.LexerATNConfig = LexerATNConfig;","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n\n//\n// Specialized {@link Set}{@code <}{@link ATNConfig}{@code >} that can track\n// info about the set, with support for combining similar configurations using a\n// graph-structured stack.\n///\n\nvar ATN = require('./ATN').ATN;\nvar Utils = require('./../Utils');\nvar Hash = Utils.Hash;\nvar Set = Utils.Set;\nvar SemanticContext = require('./SemanticContext').SemanticContext;\nvar merge = require('./../PredictionContext').merge;\n\nfunction hashATNConfig(c) {\n\treturn c.hashCodeForConfigSet();\n}\n\nfunction equalATNConfigs(a, b) {\n\tif ( a===b ) {\n\t\treturn true;\n\t} else if ( a===null || b===null ) {\n\t\treturn false;\n\t} else\n       return a.equalsForConfigSet(b);\n }\n\n\nfunction ATNConfigSet(fullCtx) {\n\t//\n\t// The reason that we need this is because we don't want the hash map to use\n\t// the standard hash code and equals. We need all configurations with the\n\t// same\n\t// {@code (s,i,_,semctx)} to be equal. Unfortunately, this key effectively\n\t// doubles\n\t// the number of objects associated with ATNConfigs. The other solution is\n\t// to\n\t// use a hash table that lets us specify the equals/hashcode operation.\n\t// All configs but hashed by (s, i, _, pi) not including context. Wiped out\n\t// when we go readonly as this set becomes a DFA state.\n\tthis.configLookup = new Set(hashATNConfig, equalATNConfigs);\n\t// Indicates that this configuration set is part of a full context\n\t// LL prediction. It will be used to determine how to merge $. With SLL\n\t// it's a wildcard whereas it is not for LL context merge.\n\tthis.fullCtx = fullCtx === undefined ? true : fullCtx;\n\t// Indicates that the set of configurations is read-only. Do not\n\t// allow any code to manipulate the set; DFA states will point at\n\t// the sets and they must not change. This does not protect the other\n\t// fields; in particular, conflictingAlts is set after\n\t// we've made this readonly.\n\tthis.readOnly = false;\n\t// Track the elements as they are added to the set; supports get(i)///\n\tthis.configs = [];\n\n\t// TODO: these fields make me pretty uncomfortable but nice to pack up info\n\t// together, saves recomputation\n\t// TODO: can we track conflicts as they are added to save scanning configs\n\t// later?\n\tthis.uniqueAlt = 0;\n\tthis.conflictingAlts = null;\n\n\t// Used in parser and lexer. In lexer, it indicates we hit a pred\n\t// while computing a closure operation. Don't make a DFA state from this.\n\tthis.hasSemanticContext = false;\n\tthis.dipsIntoOuterContext = false;\n\n\tthis.cachedHashCode = -1;\n\n\treturn this;\n}\n\n// Adding a new config means merging contexts with existing configs for\n// {@code (s, i, pi, _)}, where {@code s} is the\n// {@link ATNConfig//state}, {@code i} is the {@link ATNConfig//alt}, and\n// {@code pi} is the {@link ATNConfig//semanticContext}. We use\n// {@code (s,i,pi)} as key.\n//\n// <p>This method updates {@link //dipsIntoOuterContext} and\n// {@link //hasSemanticContext} when necessary.</p>\n// /\nATNConfigSet.prototype.add = function(config, mergeCache) {\n\tif (mergeCache === undefined) {\n\t\tmergeCache = null;\n\t}\n\tif (this.readOnly) {\n\t\tthrow \"This set is readonly\";\n\t}\n\tif (config.semanticContext !== SemanticContext.NONE) {\n\t\tthis.hasSemanticContext = true;\n\t}\n\tif (config.reachesIntoOuterContext > 0) {\n\t\tthis.dipsIntoOuterContext = true;\n\t}\n\tvar existing = this.configLookup.add(config);\n\tif (existing === config) {\n\t\tthis.cachedHashCode = -1;\n\t\tthis.configs.push(config); // track order here\n\t\treturn true;\n\t}\n\t// a previous (s,i,pi,_), merge with it and save result\n\tvar rootIsWildcard = !this.fullCtx;\n\tvar merged = merge(existing.context, config.context, rootIsWildcard, mergeCache);\n\t// no need to check for existing.context, config.context in cache\n\t// since only way to create new graphs is \"call rule\" and here. We\n\t// cache at both places.\n\texisting.reachesIntoOuterContext = Math.max( existing.reachesIntoOuterContext, config.reachesIntoOuterContext);\n\t// make sure to preserve the precedence filter suppression during the merge\n\tif (config.precedenceFilterSuppressed) {\n\t\texisting.precedenceFilterSuppressed = true;\n\t}\n\texisting.context = merged; // replace context; no need to alt mapping\n\treturn true;\n};\n\nATNConfigSet.prototype.getStates = function() {\n\tvar states = new Set();\n\tfor (var i = 0; i < this.configs.length; i++) {\n\t\tstates.add(this.configs[i].state);\n\t}\n\treturn states;\n};\n\nATNConfigSet.prototype.getPredicates = function() {\n\tvar preds = [];\n\tfor (var i = 0; i < this.configs.length; i++) {\n\t\tvar c = this.configs[i].semanticContext;\n\t\tif (c !== SemanticContext.NONE) {\n\t\t\tpreds.push(c.semanticContext);\n\t\t}\n\t}\n\treturn preds;\n};\n\nObject.defineProperty(ATNConfigSet.prototype, \"items\", {\n\tget : function() {\n\t\treturn this.configs;\n\t}\n});\n\nATNConfigSet.prototype.optimizeConfigs = function(interpreter) {\n\tif (this.readOnly) {\n\t\tthrow \"This set is readonly\";\n\t}\n\tif (this.configLookup.length === 0) {\n\t\treturn;\n\t}\n\tfor (var i = 0; i < this.configs.length; i++) {\n\t\tvar config = this.configs[i];\n\t\tconfig.context = interpreter.getCachedContext(config.context);\n\t}\n};\n\nATNConfigSet.prototype.addAll = function(coll) {\n\tfor (var i = 0; i < coll.length; i++) {\n\t\tthis.add(coll[i]);\n\t}\n\treturn false;\n};\n\nATNConfigSet.prototype.equals = function(other) {\n\treturn this === other ||\n\t\t(other instanceof ATNConfigSet &&\n\t\tUtils.equalArrays(this.configs, other.configs) &&\n\t\tthis.fullCtx === other.fullCtx &&\n\t\tthis.uniqueAlt === other.uniqueAlt &&\n\t\tthis.conflictingAlts === other.conflictingAlts &&\n\t\tthis.hasSemanticContext === other.hasSemanticContext &&\n\t\tthis.dipsIntoOuterContext === other.dipsIntoOuterContext);\n};\n\nATNConfigSet.prototype.hashCode = function() {\n    var hash = new Hash();\n\thash.update(this.configs);\n    return hash.finish();\n};\n\n\nATNConfigSet.prototype.updateHashCode = function(hash) {\n\tif (this.readOnly) {\n\t\tif (this.cachedHashCode === -1) {\n            this.cachedHashCode = this.hashCode();\n\t\t}\n        hash.update(this.cachedHashCode);\n\t} else {\n        hash.update(this.hashCode());\n\t}\n};\n\n\nObject.defineProperty(ATNConfigSet.prototype, \"length\", {\n\tget : function() {\n\t\treturn this.configs.length;\n\t}\n});\n\nATNConfigSet.prototype.isEmpty = function() {\n\treturn this.configs.length === 0;\n};\n\nATNConfigSet.prototype.contains = function(item) {\n\tif (this.configLookup === null) {\n\t\tthrow \"This method is not implemented for readonly sets.\";\n\t}\n\treturn this.configLookup.contains(item);\n};\n\nATNConfigSet.prototype.containsFast = function(item) {\n\tif (this.configLookup === null) {\n\t\tthrow \"This method is not implemented for readonly sets.\";\n\t}\n\treturn this.configLookup.containsFast(item);\n};\n\nATNConfigSet.prototype.clear = function() {\n\tif (this.readOnly) {\n\t\tthrow \"This set is readonly\";\n\t}\n\tthis.configs = [];\n\tthis.cachedHashCode = -1;\n\tthis.configLookup = new Set();\n};\n\nATNConfigSet.prototype.setReadonly = function(readOnly) {\n\tthis.readOnly = readOnly;\n\tif (readOnly) {\n\t\tthis.configLookup = null; // can't mod, no need for lookup cache\n\t}\n};\n\nATNConfigSet.prototype.toString = function() {\n\treturn Utils.arrayToString(this.configs) +\n\t\t(this.hasSemanticContext ? \",hasSemanticContext=\" + this.hasSemanticContext : \"\") +\n\t\t(this.uniqueAlt !== ATN.INVALID_ALT_NUMBER ? \",uniqueAlt=\" + this.uniqueAlt : \"\") +\n\t\t(this.conflictingAlts !== null ? \",conflictingAlts=\" + this.conflictingAlts : \"\") +\n\t\t(this.dipsIntoOuterContext ? \",dipsIntoOuterContext\" : \"\");\n};\n\nfunction OrderedATNConfigSet() {\n\tATNConfigSet.call(this);\n\tthis.configLookup = new Set();\n\treturn this;\n}\n\nOrderedATNConfigSet.prototype = Object.create(ATNConfigSet.prototype);\nOrderedATNConfigSet.prototype.constructor = OrderedATNConfigSet;\n\nexports.ATNConfigSet = ATNConfigSet;\nexports.OrderedATNConfigSet = OrderedATNConfigSet;\n","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n\nfunction ATNDeserializationOptions(copyFrom) {\n\tif(copyFrom===undefined) {\n\t\tcopyFrom = null;\n\t}\n\tthis.readOnly = false;\n    this.verifyATN = copyFrom===null ? true : copyFrom.verifyATN;\n    this.generateRuleBypassTransitions = copyFrom===null ? false : copyFrom.generateRuleBypassTransitions;\n\n    return this;\n}\n\nATNDeserializationOptions.defaultOptions = new ATNDeserializationOptions();\nATNDeserializationOptions.defaultOptions.readOnly = true;\n\n//    def __setattr__(self, key, value):\n//        if key!=\"readOnly\" and self.readOnly:\n//            raise Exception(\"The object is read only.\")\n//        super(type(self), self).__setattr__(key,value)\n\nexports.ATNDeserializationOptions = ATNDeserializationOptions;\n","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n\nvar Token = require('./../Token').Token;\nvar ATN = require('./ATN').ATN;\nvar ATNType = require('./ATNType').ATNType;\nvar ATNStates = require('./ATNState');\nvar ATNState = ATNStates.ATNState;\nvar BasicState = ATNStates.BasicState;\nvar DecisionState = ATNStates.DecisionState;\nvar BlockStartState = ATNStates.BlockStartState;\nvar BlockEndState = ATNStates.BlockEndState;\nvar LoopEndState = ATNStates.LoopEndState;\nvar RuleStartState = ATNStates.RuleStartState;\nvar RuleStopState = ATNStates.RuleStopState;\nvar TokensStartState = ATNStates.TokensStartState;\nvar PlusLoopbackState = ATNStates.PlusLoopbackState;\nvar StarLoopbackState = ATNStates.StarLoopbackState;\nvar StarLoopEntryState = ATNStates.StarLoopEntryState;\nvar PlusBlockStartState = ATNStates.PlusBlockStartState;\nvar StarBlockStartState = ATNStates.StarBlockStartState;\nvar BasicBlockStartState = ATNStates.BasicBlockStartState;\nvar Transitions = require('./Transition');\nvar Transition = Transitions.Transition;\nvar AtomTransition = Transitions.AtomTransition;\nvar SetTransition = Transitions.SetTransition;\nvar NotSetTransition = Transitions.NotSetTransition;\nvar RuleTransition = Transitions.RuleTransition;\nvar RangeTransition = Transitions.RangeTransition;\nvar ActionTransition = Transitions.ActionTransition;\nvar EpsilonTransition = Transitions.EpsilonTransition;\nvar WildcardTransition = Transitions.WildcardTransition;\nvar PredicateTransition = Transitions.PredicateTransition;\nvar PrecedencePredicateTransition = Transitions.PrecedencePredicateTransition;\nvar IntervalSet = require('./../IntervalSet').IntervalSet;\nvar Interval = require('./../IntervalSet').Interval;\nvar ATNDeserializationOptions = require('./ATNDeserializationOptions').ATNDeserializationOptions;\nvar LexerActions = require('./LexerAction');\nvar LexerActionType = LexerActions.LexerActionType;\nvar LexerSkipAction = LexerActions.LexerSkipAction;\nvar LexerChannelAction = LexerActions.LexerChannelAction;\nvar LexerCustomAction = LexerActions.LexerCustomAction;\nvar LexerMoreAction = LexerActions.LexerMoreAction;\nvar LexerTypeAction = LexerActions.LexerTypeAction;\nvar LexerPushModeAction = LexerActions.LexerPushModeAction;\nvar LexerPopModeAction = LexerActions.LexerPopModeAction;\nvar LexerModeAction = LexerActions.LexerModeAction;\n// This is the earliest supported serialized UUID.\n// stick to serialized version for now, we don't need a UUID instance\nvar BASE_SERIALIZED_UUID = \"AADB8D7E-AEEF-4415-AD2B-8204D6CF042E\";\n\n//\n// This UUID indicates the serialized ATN contains two sets of\n// IntervalSets, where the second set's values are encoded as\n// 32-bit integers to support the full Unicode SMP range up to U+10FFFF.\n//\nvar ADDED_UNICODE_SMP = \"59627784-3BE5-417A-B9EB-8131A7286089\";\n\n// This list contains all of the currently supported UUIDs, ordered by when\n// the feature first appeared in this branch.\nvar SUPPORTED_UUIDS = [ BASE_SERIALIZED_UUID, ADDED_UNICODE_SMP ];\n\nvar SERIALIZED_VERSION = 3;\n\n// This is the current serialized UUID.\nvar SERIALIZED_UUID = ADDED_UNICODE_SMP;\n\nfunction initArray( length, value) {\n\tvar tmp = [];\n\ttmp[length-1] = value;\n\treturn tmp.map(function(i) {return value;});\n}\n\nfunction ATNDeserializer (options) {\n\n    if ( options=== undefined || options === null ) {\n        options = ATNDeserializationOptions.defaultOptions;\n    }\n    this.deserializationOptions = options;\n    this.stateFactories = null;\n    this.actionFactories = null;\n\n    return this;\n}\n\n// Determines if a particular serialized representation of an ATN supports\n// a particular feature, identified by the {@link UUID} used for serializing\n// the ATN at the time the feature was first introduced.\n//\n// @param feature The {@link UUID} marking the first time the feature was\n// supported in the serialized ATN.\n// @param actualUuid The {@link UUID} of the actual serialized ATN which is\n// currently being deserialized.\n// @return {@code true} if the {@code actualUuid} value represents a\n// serialized ATN at or after the feature identified by {@code feature} was\n// introduced; otherwise, {@code false}.\n\nATNDeserializer.prototype.isFeatureSupported = function(feature, actualUuid) {\n    var idx1 = SUPPORTED_UUIDS.indexOf(feature);\n    if (idx1<0) {\n        return false;\n    }\n    var idx2 = SUPPORTED_UUIDS.indexOf(actualUuid);\n    return idx2 >= idx1;\n};\n\nATNDeserializer.prototype.deserialize = function(data) {\n    this.reset(data);\n    this.checkVersion();\n    this.checkUUID();\n    var atn = this.readATN();\n    this.readStates(atn);\n    this.readRules(atn);\n    this.readModes(atn);\n    var sets = [];\n    // First, deserialize sets with 16-bit arguments <= U+FFFF.\n    this.readSets(atn, sets, this.readInt.bind(this));\n    // Next, if the ATN was serialized with the Unicode SMP feature,\n    // deserialize sets with 32-bit arguments <= U+10FFFF.\n    if (this.isFeatureSupported(ADDED_UNICODE_SMP, this.uuid)) {\n        this.readSets(atn, sets, this.readInt32.bind(this));\n    }\n    this.readEdges(atn, sets);\n    this.readDecisions(atn);\n    this.readLexerActions(atn);\n    this.markPrecedenceDecisions(atn);\n    this.verifyATN(atn);\n    if (this.deserializationOptions.generateRuleBypassTransitions && atn.grammarType === ATNType.PARSER ) {\n        this.generateRuleBypassTransitions(atn);\n        // re-verify after modification\n        this.verifyATN(atn);\n    }\n    return atn;\n};\n\nATNDeserializer.prototype.reset = function(data) {\n\tvar adjust = function(c) {\n        var v = c.charCodeAt(0);\n        return v>1  ? v-2 : v + 65534;\n\t};\n    var temp = data.split(\"\").map(adjust);\n    // don't adjust the first value since that's the version number\n    temp[0] = data.charCodeAt(0);\n    this.data = temp;\n    this.pos = 0;\n};\n\nATNDeserializer.prototype.checkVersion = function() {\n    var version = this.readInt();\n    if ( version !== SERIALIZED_VERSION ) {\n        throw (\"Could not deserialize ATN with version \" + version + \" (expected \" + SERIALIZED_VERSION + \").\");\n    }\n};\n\nATNDeserializer.prototype.checkUUID = function() {\n    var uuid = this.readUUID();\n    if (SUPPORTED_UUIDS.indexOf(uuid)<0) {\n        throw (\"Could not deserialize ATN with UUID: \" + uuid +\n                        \" (expected \" + SERIALIZED_UUID + \" or a legacy UUID).\", uuid, SERIALIZED_UUID);\n    }\n    this.uuid = uuid;\n};\n\nATNDeserializer.prototype.readATN = function() {\n    var grammarType = this.readInt();\n    var maxTokenType = this.readInt();\n    return new ATN(grammarType, maxTokenType);\n};\n\nATNDeserializer.prototype.readStates = function(atn) {\n\tvar j, pair, stateNumber;\n    var loopBackStateNumbers = [];\n    var endStateNumbers = [];\n    var nstates = this.readInt();\n    for(var i=0; i<nstates; i++) {\n        var stype = this.readInt();\n        // ignore bad type of states\n        if (stype===ATNState.INVALID_TYPE) {\n            atn.addState(null);\n            continue;\n        }\n        var ruleIndex = this.readInt();\n        if (ruleIndex === 0xFFFF) {\n            ruleIndex = -1;\n        }\n        var s = this.stateFactory(stype, ruleIndex);\n        if (stype === ATNState.LOOP_END) { // special case\n            var loopBackStateNumber = this.readInt();\n            loopBackStateNumbers.push([s, loopBackStateNumber]);\n        } else if(s instanceof BlockStartState) {\n            var endStateNumber = this.readInt();\n            endStateNumbers.push([s, endStateNumber]);\n        }\n        atn.addState(s);\n    }\n    // delay the assignment of loop back and end states until we know all the\n\t// state instances have been initialized\n    for (j=0; j<loopBackStateNumbers.length; j++) {\n        pair = loopBackStateNumbers[j];\n        pair[0].loopBackState = atn.states[pair[1]];\n    }\n\n    for (j=0; j<endStateNumbers.length; j++) {\n        pair = endStateNumbers[j];\n        pair[0].endState = atn.states[pair[1]];\n    }\n\n    var numNonGreedyStates = this.readInt();\n    for (j=0; j<numNonGreedyStates; j++) {\n        stateNumber = this.readInt();\n        atn.states[stateNumber].nonGreedy = true;\n    }\n\n    var numPrecedenceStates = this.readInt();\n    for (j=0; j<numPrecedenceStates; j++) {\n        stateNumber = this.readInt();\n        atn.states[stateNumber].isPrecedenceRule = true;\n    }\n};\n\nATNDeserializer.prototype.readRules = function(atn) {\n    var i;\n    var nrules = this.readInt();\n    if (atn.grammarType === ATNType.LEXER ) {\n        atn.ruleToTokenType = initArray(nrules, 0);\n    }\n    atn.ruleToStartState = initArray(nrules, 0);\n    for (i=0; i<nrules; i++) {\n        var s = this.readInt();\n        var startState = atn.states[s];\n        atn.ruleToStartState[i] = startState;\n        if ( atn.grammarType === ATNType.LEXER ) {\n            var tokenType = this.readInt();\n            if (tokenType === 0xFFFF) {\n                tokenType = Token.EOF;\n            }\n            atn.ruleToTokenType[i] = tokenType;\n        }\n    }\n    atn.ruleToStopState = initArray(nrules, 0);\n    for (i=0; i<atn.states.length; i++) {\n        var state = atn.states[i];\n        if (!(state instanceof RuleStopState)) {\n            continue;\n        }\n        atn.ruleToStopState[state.ruleIndex] = state;\n        atn.ruleToStartState[state.ruleIndex].stopState = state;\n    }\n};\n\nATNDeserializer.prototype.readModes = function(atn) {\n    var nmodes = this.readInt();\n    for (var i=0; i<nmodes; i++) {\n        var s = this.readInt();\n        atn.modeToStartState.push(atn.states[s]);\n    }\n};\n\nATNDeserializer.prototype.readSets = function(atn, sets, readUnicode) {\n    var m = this.readInt();\n    for (var i=0; i<m; i++) {\n        var iset = new IntervalSet();\n        sets.push(iset);\n        var n = this.readInt();\n        var containsEof = this.readInt();\n        if (containsEof!==0) {\n            iset.addOne(-1);\n        }\n        for (var j=0; j<n; j++) {\n            var i1 = readUnicode();\n            var i2 = readUnicode();\n            iset.addRange(i1, i2);\n        }\n    }\n};\n\nATNDeserializer.prototype.readEdges = function(atn, sets) {\n\tvar i, j, state, trans, target;\n    var nedges = this.readInt();\n    for (i=0; i<nedges; i++) {\n        var src = this.readInt();\n        var trg = this.readInt();\n        var ttype = this.readInt();\n        var arg1 = this.readInt();\n        var arg2 = this.readInt();\n        var arg3 = this.readInt();\n        trans = this.edgeFactory(atn, ttype, src, trg, arg1, arg2, arg3, sets);\n        var srcState = atn.states[src];\n        srcState.addTransition(trans);\n    }\n    // edges for rule stop states can be derived, so they aren't serialized\n    for (i=0; i<atn.states.length; i++) {\n        state = atn.states[i];\n        for (j=0; j<state.transitions.length; j++) {\n            var t = state.transitions[j];\n            if (!(t instanceof RuleTransition)) {\n                continue;\n            }\n\t\t\tvar outermostPrecedenceReturn = -1;\n\t\t\tif (atn.ruleToStartState[t.target.ruleIndex].isPrecedenceRule) {\n\t\t\t\tif (t.precedence === 0) {\n\t\t\t\t\toutermostPrecedenceReturn = t.target.ruleIndex;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\ttrans = new EpsilonTransition(t.followState, outermostPrecedenceReturn);\n            atn.ruleToStopState[t.target.ruleIndex].addTransition(trans);\n        }\n    }\n\n    for (i=0; i<atn.states.length; i++) {\n        state = atn.states[i];\n        if (state instanceof BlockStartState) {\n            // we need to know the end state to set its start state\n            if (state.endState === null) {\n                throw (\"IllegalState\");\n            }\n            // block end states can only be associated to a single block start\n\t\t\t// state\n            if ( state.endState.startState !== null) {\n                throw (\"IllegalState\");\n            }\n            state.endState.startState = state;\n        }\n        if (state instanceof PlusLoopbackState) {\n            for (j=0; j<state.transitions.length; j++) {\n                target = state.transitions[j].target;\n                if (target instanceof PlusBlockStartState) {\n                    target.loopBackState = state;\n                }\n            }\n        } else if (state instanceof StarLoopbackState) {\n            for (j=0; j<state.transitions.length; j++) {\n                target = state.transitions[j].target;\n                if (target instanceof StarLoopEntryState) {\n                    target.loopBackState = state;\n                }\n            }\n        }\n    }\n};\n\nATNDeserializer.prototype.readDecisions = function(atn) {\n    var ndecisions = this.readInt();\n    for (var i=0; i<ndecisions; i++) {\n        var s = this.readInt();\n        var decState = atn.states[s];\n        atn.decisionToState.push(decState);\n        decState.decision = i;\n    }\n};\n\nATNDeserializer.prototype.readLexerActions = function(atn) {\n    if (atn.grammarType === ATNType.LEXER) {\n        var count = this.readInt();\n        atn.lexerActions = initArray(count, null);\n        for (var i=0; i<count; i++) {\n            var actionType = this.readInt();\n            var data1 = this.readInt();\n            if (data1 === 0xFFFF) {\n                data1 = -1;\n            }\n            var data2 = this.readInt();\n            if (data2 === 0xFFFF) {\n                data2 = -1;\n            }\n            var lexerAction = this.lexerActionFactory(actionType, data1, data2);\n            atn.lexerActions[i] = lexerAction;\n        }\n    }\n};\n\nATNDeserializer.prototype.generateRuleBypassTransitions = function(atn) {\n\tvar i;\n    var count = atn.ruleToStartState.length;\n    for(i=0; i<count; i++) {\n        atn.ruleToTokenType[i] = atn.maxTokenType + i + 1;\n    }\n    for(i=0; i<count; i++) {\n        this.generateRuleBypassTransition(atn, i);\n    }\n};\n\nATNDeserializer.prototype.generateRuleBypassTransition = function(atn, idx) {\n\tvar i, state;\n    var bypassStart = new BasicBlockStartState();\n    bypassStart.ruleIndex = idx;\n    atn.addState(bypassStart);\n\n    var bypassStop = new BlockEndState();\n    bypassStop.ruleIndex = idx;\n    atn.addState(bypassStop);\n\n    bypassStart.endState = bypassStop;\n    atn.defineDecisionState(bypassStart);\n\n    bypassStop.startState = bypassStart;\n\n    var excludeTransition = null;\n    var endState = null;\n\n    if (atn.ruleToStartState[idx].isPrecedenceRule) {\n        // wrap from the beginning of the rule to the StarLoopEntryState\n        endState = null;\n        for(i=0; i<atn.states.length; i++) {\n            state = atn.states[i];\n            if (this.stateIsEndStateFor(state, idx)) {\n                endState = state;\n                excludeTransition = state.loopBackState.transitions[0];\n                break;\n            }\n        }\n        if (excludeTransition === null) {\n            throw (\"Couldn't identify final state of the precedence rule prefix section.\");\n        }\n    } else {\n        endState = atn.ruleToStopState[idx];\n    }\n\n    // all non-excluded transitions that currently target end state need to\n\t// target blockEnd instead\n    for(i=0; i<atn.states.length; i++) {\n        state = atn.states[i];\n        for(var j=0; j<state.transitions.length; j++) {\n            var transition = state.transitions[j];\n            if (transition === excludeTransition) {\n                continue;\n            }\n            if (transition.target === endState) {\n                transition.target = bypassStop;\n            }\n        }\n    }\n\n    // all transitions leaving the rule start state need to leave blockStart\n\t// instead\n    var ruleToStartState = atn.ruleToStartState[idx];\n    var count = ruleToStartState.transitions.length;\n    while ( count > 0) {\n        bypassStart.addTransition(ruleToStartState.transitions[count-1]);\n        ruleToStartState.transitions = ruleToStartState.transitions.slice(-1);\n    }\n    // link the new states\n    atn.ruleToStartState[idx].addTransition(new EpsilonTransition(bypassStart));\n    bypassStop.addTransition(new EpsilonTransition(endState));\n\n    var matchState = new BasicState();\n    atn.addState(matchState);\n    matchState.addTransition(new AtomTransition(bypassStop, atn.ruleToTokenType[idx]));\n    bypassStart.addTransition(new EpsilonTransition(matchState));\n};\n\nATNDeserializer.prototype.stateIsEndStateFor = function(state, idx) {\n    if ( state.ruleIndex !== idx) {\n        return null;\n    }\n    if (!( state instanceof StarLoopEntryState)) {\n        return null;\n    }\n    var maybeLoopEndState = state.transitions[state.transitions.length - 1].target;\n    if (!( maybeLoopEndState instanceof LoopEndState)) {\n        return null;\n    }\n    if (maybeLoopEndState.epsilonOnlyTransitions &&\n        (maybeLoopEndState.transitions[0].target instanceof RuleStopState)) {\n        return state;\n    } else {\n        return null;\n    }\n};\n\n//\n// Analyze the {@link StarLoopEntryState} states in the specified ATN to set\n// the {@link StarLoopEntryState//isPrecedenceDecision} field to the\n// correct value.\n//\n// @param atn The ATN.\n//\nATNDeserializer.prototype.markPrecedenceDecisions = function(atn) {\n\tfor(var i=0; i<atn.states.length; i++) {\n\t\tvar state = atn.states[i];\n\t\tif (!( state instanceof StarLoopEntryState)) {\n            continue;\n        }\n        // We analyze the ATN to determine if this ATN decision state is the\n        // decision for the closure block that determines whether a\n        // precedence rule should continue or complete.\n        //\n        if ( atn.ruleToStartState[state.ruleIndex].isPrecedenceRule) {\n            var maybeLoopEndState = state.transitions[state.transitions.length - 1].target;\n            if (maybeLoopEndState instanceof LoopEndState) {\n                if ( maybeLoopEndState.epsilonOnlyTransitions &&\n                        (maybeLoopEndState.transitions[0].target instanceof RuleStopState)) {\n                    state.isPrecedenceDecision = true;\n                }\n            }\n        }\n\t}\n};\n\nATNDeserializer.prototype.verifyATN = function(atn) {\n    if (!this.deserializationOptions.verifyATN) {\n        return;\n    }\n    // verify assumptions\n\tfor(var i=0; i<atn.states.length; i++) {\n        var state = atn.states[i];\n        if (state === null) {\n            continue;\n        }\n        this.checkCondition(state.epsilonOnlyTransitions || state.transitions.length <= 1);\n        if (state instanceof PlusBlockStartState) {\n            this.checkCondition(state.loopBackState !== null);\n        } else  if (state instanceof StarLoopEntryState) {\n            this.checkCondition(state.loopBackState !== null);\n            this.checkCondition(state.transitions.length === 2);\n            if (state.transitions[0].target instanceof StarBlockStartState) {\n                this.checkCondition(state.transitions[1].target instanceof LoopEndState);\n                this.checkCondition(!state.nonGreedy);\n            } else if (state.transitions[0].target instanceof LoopEndState) {\n                this.checkCondition(state.transitions[1].target instanceof StarBlockStartState);\n                this.checkCondition(state.nonGreedy);\n            } else {\n                throw(\"IllegalState\");\n            }\n        } else if (state instanceof StarLoopbackState) {\n            this.checkCondition(state.transitions.length === 1);\n            this.checkCondition(state.transitions[0].target instanceof StarLoopEntryState);\n        } else if (state instanceof LoopEndState) {\n            this.checkCondition(state.loopBackState !== null);\n        } else if (state instanceof RuleStartState) {\n            this.checkCondition(state.stopState !== null);\n        } else if (state instanceof BlockStartState) {\n            this.checkCondition(state.endState !== null);\n        } else if (state instanceof BlockEndState) {\n            this.checkCondition(state.startState !== null);\n        } else if (state instanceof DecisionState) {\n            this.checkCondition(state.transitions.length <= 1 || state.decision >= 0);\n        } else {\n            this.checkCondition(state.transitions.length <= 1 || (state instanceof RuleStopState));\n        }\n\t}\n};\n\nATNDeserializer.prototype.checkCondition = function(condition, message) {\n    if (!condition) {\n        if (message === undefined || message===null) {\n            message = \"IllegalState\";\n        }\n        throw (message);\n    }\n};\n\nATNDeserializer.prototype.readInt = function() {\n    return this.data[this.pos++];\n};\n\nATNDeserializer.prototype.readInt32 = function() {\n    var low = this.readInt();\n    var high = this.readInt();\n    return low | (high << 16);\n};\n\nATNDeserializer.prototype.readLong = function() {\n    var low = this.readInt32();\n    var high = this.readInt32();\n    return (low & 0x00000000FFFFFFFF) | (high << 32);\n};\n\nfunction createByteToHex() {\n\tvar bth = [];\n\tfor (var i = 0; i < 256; i++) {\n\t\tbth[i] = (i + 0x100).toString(16).substr(1).toUpperCase();\n\t}\n\treturn bth;\n}\n\nvar byteToHex = createByteToHex();\n\nATNDeserializer.prototype.readUUID = function() {\n\tvar bb = [];\n\tfor(var i=7;i>=0;i--) {\n\t\tvar int = this.readInt();\n\t\t/* jshint bitwise: false */\n\t\tbb[(2*i)+1] = int & 0xFF;\n\t\tbb[2*i] = (int >> 8) & 0xFF;\n\t}\n    return byteToHex[bb[0]] + byteToHex[bb[1]] +\n    byteToHex[bb[2]] + byteToHex[bb[3]] + '-' +\n    byteToHex[bb[4]] + byteToHex[bb[5]] + '-' +\n    byteToHex[bb[6]] + byteToHex[bb[7]] + '-' +\n    byteToHex[bb[8]] + byteToHex[bb[9]] + '-' +\n    byteToHex[bb[10]] + byteToHex[bb[11]] +\n    byteToHex[bb[12]] + byteToHex[bb[13]] +\n    byteToHex[bb[14]] + byteToHex[bb[15]];\n};\n\nATNDeserializer.prototype.edgeFactory = function(atn, type, src, trg, arg1, arg2, arg3, sets) {\n    var target = atn.states[trg];\n    switch(type) {\n    case Transition.EPSILON:\n        return new EpsilonTransition(target);\n    case Transition.RANGE:\n        return arg3 !== 0 ? new RangeTransition(target, Token.EOF, arg2) : new RangeTransition(target, arg1, arg2);\n    case Transition.RULE:\n        return new RuleTransition(atn.states[arg1], arg2, arg3, target);\n    case Transition.PREDICATE:\n        return new PredicateTransition(target, arg1, arg2, arg3 !== 0);\n    case Transition.PRECEDENCE:\n        return new PrecedencePredicateTransition(target, arg1);\n    case Transition.ATOM:\n        return arg3 !== 0 ? new AtomTransition(target, Token.EOF) : new AtomTransition(target, arg1);\n    case Transition.ACTION:\n        return new ActionTransition(target, arg1, arg2, arg3 !== 0);\n    case Transition.SET:\n        return new SetTransition(target, sets[arg1]);\n    case Transition.NOT_SET:\n        return new NotSetTransition(target, sets[arg1]);\n    case Transition.WILDCARD:\n        return new WildcardTransition(target);\n    default:\n        throw \"The specified transition type: \" + type + \" is not valid.\";\n    }\n};\n\nATNDeserializer.prototype.stateFactory = function(type, ruleIndex) {\n    if (this.stateFactories === null) {\n        var sf = [];\n        sf[ATNState.INVALID_TYPE] = null;\n        sf[ATNState.BASIC] = function() { return new BasicState(); };\n        sf[ATNState.RULE_START] = function() { return new RuleStartState(); };\n        sf[ATNState.BLOCK_START] = function() { return new BasicBlockStartState(); };\n        sf[ATNState.PLUS_BLOCK_START] = function() { return new PlusBlockStartState(); };\n        sf[ATNState.STAR_BLOCK_START] = function() { return new StarBlockStartState(); };\n        sf[ATNState.TOKEN_START] = function() { return new TokensStartState(); };\n        sf[ATNState.RULE_STOP] = function() { return new RuleStopState(); };\n        sf[ATNState.BLOCK_END] = function() { return new BlockEndState(); };\n        sf[ATNState.STAR_LOOP_BACK] = function() { return new StarLoopbackState(); };\n        sf[ATNState.STAR_LOOP_ENTRY] = function() { return new StarLoopEntryState(); };\n        sf[ATNState.PLUS_LOOP_BACK] = function() { return new PlusLoopbackState(); };\n        sf[ATNState.LOOP_END] = function() { return new LoopEndState(); };\n        this.stateFactories = sf;\n    }\n    if (type>this.stateFactories.length || this.stateFactories[type] === null) {\n        throw(\"The specified state type \" + type + \" is not valid.\");\n    } else {\n        var s = this.stateFactories[type]();\n        if (s!==null) {\n            s.ruleIndex = ruleIndex;\n            return s;\n        }\n    }\n};\n\nATNDeserializer.prototype.lexerActionFactory = function(type, data1, data2) {\n    if (this.actionFactories === null) {\n        var af = [];\n        af[LexerActionType.CHANNEL] = function(data1, data2) { return new LexerChannelAction(data1); };\n        af[LexerActionType.CUSTOM] = function(data1, data2) { return new LexerCustomAction(data1, data2); };\n        af[LexerActionType.MODE] = function(data1, data2) { return new LexerModeAction(data1); };\n        af[LexerActionType.MORE] = function(data1, data2) { return LexerMoreAction.INSTANCE; };\n        af[LexerActionType.POP_MODE] = function(data1, data2) { return LexerPopModeAction.INSTANCE; };\n        af[LexerActionType.PUSH_MODE] = function(data1, data2) { return new LexerPushModeAction(data1); };\n        af[LexerActionType.SKIP] = function(data1, data2) { return LexerSkipAction.INSTANCE; };\n        af[LexerActionType.TYPE] = function(data1, data2) { return new LexerTypeAction(data1); };\n        this.actionFactories = af;\n    }\n    if (type>this.actionFactories.length || this.actionFactories[type] === null) {\n        throw(\"The specified lexer action type \" + type + \" is not valid.\");\n    } else {\n        return this.actionFactories[type](data1, data2);\n    }\n};\n\n\nexports.ATNDeserializer = ATNDeserializer;","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n///\n\nvar DFAState = require('./../dfa/DFAState').DFAState;\nvar ATNConfigSet = require('./ATNConfigSet').ATNConfigSet;\nvar getCachedPredictionContext = require('./../PredictionContext').getCachedPredictionContext;\nvar Map = require('./../Utils').Map;\n\nfunction ATNSimulator(atn, sharedContextCache) {\n\n    // The context cache maps all PredictionContext objects that are ==\n    //  to a single cached copy. This cache is shared across all contexts\n    //  in all ATNConfigs in all DFA states.  We rebuild each ATNConfigSet\n    //  to use only cached nodes/graphs in addDFAState(). We don't want to\n    //  fill this during closure() since there are lots of contexts that\n    //  pop up but are not used ever again. It also greatly slows down closure().\n    //\n    //  <p>This cache makes a huge difference in memory and a little bit in speed.\n    //  For the Java grammar on java.*, it dropped the memory requirements\n    //  at the end from 25M to 16M. We don't store any of the full context\n    //  graphs in the DFA because they are limited to local context only,\n    //  but apparently there's a lot of repetition there as well. We optimize\n    //  the config contexts before storing the config set in the DFA states\n    //  by literally rebuilding them with cached subgraphs only.</p>\n    //\n    //  <p>I tried a cache for use during closure operations, that was\n    //  whacked after each adaptivePredict(). It cost a little bit\n    //  more time I think and doesn't save on the overall footprint\n    //  so it's not worth the complexity.</p>\n    ///\n    this.atn = atn;\n    this.sharedContextCache = sharedContextCache;\n    return this;\n}\n\n// Must distinguish between missing edge and edge we know leads nowhere///\nATNSimulator.ERROR = new DFAState(0x7FFFFFFF, new ATNConfigSet());\n\n\nATNSimulator.prototype.getCachedContext = function(context) {\n    if (this.sharedContextCache ===null) {\n        return context;\n    }\n    var visited = new Map();\n    return getCachedPredictionContext(context, this.sharedContextCache, visited);\n};\n\nexports.ATNSimulator = ATNSimulator;\n","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n//\n\n// The following images show the relation of states and\n// {@link ATNState//transitions} for various grammar constructs.\n//\n// <ul>\n//\n// <li>Solid edges marked with an &//0949; indicate a required\n// {@link EpsilonTransition}.</li>\n//\n// <li>Dashed edges indicate locations where any transition derived from\n// {@link Transition} might appear.</li>\n//\n// <li>Dashed nodes are place holders for either a sequence of linked\n// {@link BasicState} states or the inclusion of a block representing a nested\n// construct in one of the forms below.</li>\n//\n// <li>Nodes showing multiple outgoing alternatives with a {@code ...} support\n// any number of alternatives (one or more). Nodes without the {@code ...} only\n// support the exact number of alternatives shown in the diagram.</li>\n//\n// </ul>\n//\n// <h2>Basic Blocks</h2>\n//\n// <h3>Rule</h3>\n//\n// <embed src=\"images/Rule.svg\" type=\"image/svg+xml\"/>\n//\n// <h3>Block of 1 or more alternatives</h3>\n//\n// <embed src=\"images/Block.svg\" type=\"image/svg+xml\"/>\n//\n// <h2>Greedy Loops</h2>\n//\n// <h3>Greedy Closure: {@code (...)*}</h3>\n//\n// <embed src=\"images/ClosureGreedy.svg\" type=\"image/svg+xml\"/>\n//\n// <h3>Greedy Positive Closure: {@code (...)+}</h3>\n//\n// <embed src=\"images/PositiveClosureGreedy.svg\" type=\"image/svg+xml\"/>\n//\n// <h3>Greedy Optional: {@code (...)?}</h3>\n//\n// <embed src=\"images/OptionalGreedy.svg\" type=\"image/svg+xml\"/>\n//\n// <h2>Non-Greedy Loops</h2>\n//\n// <h3>Non-Greedy Closure: {@code (...)*?}</h3>\n//\n// <embed src=\"images/ClosureNonGreedy.svg\" type=\"image/svg+xml\"/>\n//\n// <h3>Non-Greedy Positive Closure: {@code (...)+?}</h3>\n//\n// <embed src=\"images/PositiveClosureNonGreedy.svg\" type=\"image/svg+xml\"/>\n//\n// <h3>Non-Greedy Optional: {@code (...)??}</h3>\n//\n// <embed src=\"images/OptionalNonGreedy.svg\" type=\"image/svg+xml\"/>\n//\n\nvar INITIAL_NUM_TRANSITIONS = 4;\n\nfunction ATNState() {\n    // Which ATN are we in?\n    this.atn = null;\n    this.stateNumber = ATNState.INVALID_STATE_NUMBER;\n    this.stateType = null;\n    this.ruleIndex = 0; // at runtime, we don't have Rule objects\n    this.epsilonOnlyTransitions = false;\n    // Track the transitions emanating from this ATN state.\n    this.transitions = [];\n    // Used to cache lookahead during parsing, not used during construction\n    this.nextTokenWithinRule = null;\n    return this;\n}\n\n// constants for serialization\nATNState.INVALID_TYPE = 0;\nATNState.BASIC = 1;\nATNState.RULE_START = 2;\nATNState.BLOCK_START = 3;\nATNState.PLUS_BLOCK_START = 4;\nATNState.STAR_BLOCK_START = 5;\nATNState.TOKEN_START = 6;\nATNState.RULE_STOP = 7;\nATNState.BLOCK_END = 8;\nATNState.STAR_LOOP_BACK = 9;\nATNState.STAR_LOOP_ENTRY = 10;\nATNState.PLUS_LOOP_BACK = 11;\nATNState.LOOP_END = 12;\n\nATNState.serializationNames = [\n            \"INVALID\",\n            \"BASIC\",\n            \"RULE_START\",\n            \"BLOCK_START\",\n            \"PLUS_BLOCK_START\",\n            \"STAR_BLOCK_START\",\n            \"TOKEN_START\",\n            \"RULE_STOP\",\n            \"BLOCK_END\",\n            \"STAR_LOOP_BACK\",\n            \"STAR_LOOP_ENTRY\",\n            \"PLUS_LOOP_BACK\",\n            \"LOOP_END\" ];\n\nATNState.INVALID_STATE_NUMBER = -1;\n\nATNState.prototype.toString = function() {\n\treturn this.stateNumber;\n};\n\nATNState.prototype.equals = function(other) {\n    if (other instanceof ATNState) {\n        return this.stateNumber===other.stateNumber;\n    } else {\n        return false;\n    }\n};\n\nATNState.prototype.isNonGreedyExitState = function() {\n    return false;\n};\n\n\nATNState.prototype.addTransition = function(trans, index) {\n\tif(index===undefined) {\n\t\tindex = -1;\n\t}\n    if (this.transitions.length===0) {\n        this.epsilonOnlyTransitions = trans.isEpsilon;\n    } else if(this.epsilonOnlyTransitions !== trans.isEpsilon) {\n        this.epsilonOnlyTransitions = false;\n    }\n    if (index===-1) {\n        this.transitions.push(trans);\n    } else {\n        this.transitions.splice(index, 1, trans);\n    }\n};\n\nfunction BasicState() {\n\tATNState.call(this);\n    this.stateType = ATNState.BASIC;\n    return this;\n}\n\nBasicState.prototype = Object.create(ATNState.prototype);\nBasicState.prototype.constructor = BasicState;\n\n\nfunction DecisionState() {\n\tATNState.call(this);\n    this.decision = -1;\n    this.nonGreedy = false;\n    return this;\n}\n\nDecisionState.prototype = Object.create(ATNState.prototype);\nDecisionState.prototype.constructor = DecisionState;\n\n\n//  The start of a regular {@code (...)} block.\nfunction BlockStartState() {\n\tDecisionState.call(this);\n\tthis.endState = null;\n\treturn this;\n}\n\nBlockStartState.prototype = Object.create(DecisionState.prototype);\nBlockStartState.prototype.constructor = BlockStartState;\n\n\nfunction BasicBlockStartState() {\n\tBlockStartState.call(this);\n\tthis.stateType = ATNState.BLOCK_START;\n\treturn this;\n}\n\nBasicBlockStartState.prototype = Object.create(BlockStartState.prototype);\nBasicBlockStartState.prototype.constructor = BasicBlockStartState;\n\n\n// Terminal node of a simple {@code (a|b|c)} block.\nfunction BlockEndState() {\n\tATNState.call(this);\n\tthis.stateType = ATNState.BLOCK_END;\n    this.startState = null;\n    return this;\n}\n\nBlockEndState.prototype = Object.create(ATNState.prototype);\nBlockEndState.prototype.constructor = BlockEndState;\n\n\n// The last node in the ATN for a rule, unless that rule is the start symbol.\n//  In that case, there is one transition to EOF. Later, we might encode\n//  references to all calls to this rule to compute FOLLOW sets for\n//  error handling.\n//\nfunction RuleStopState() {\n\tATNState.call(this);\n    this.stateType = ATNState.RULE_STOP;\n    return this;\n}\n\nRuleStopState.prototype = Object.create(ATNState.prototype);\nRuleStopState.prototype.constructor = RuleStopState;\n\nfunction RuleStartState() {\n\tATNState.call(this);\n\tthis.stateType = ATNState.RULE_START;\n\tthis.stopState = null;\n\tthis.isPrecedenceRule = false;\n\treturn this;\n}\n\nRuleStartState.prototype = Object.create(ATNState.prototype);\nRuleStartState.prototype.constructor = RuleStartState;\n\n// Decision state for {@code A+} and {@code (A|B)+}.  It has two transitions:\n//  one to the loop back to start of the block and one to exit.\n//\nfunction PlusLoopbackState() {\n\tDecisionState.call(this);\n\tthis.stateType = ATNState.PLUS_LOOP_BACK;\n\treturn this;\n}\n\nPlusLoopbackState.prototype = Object.create(DecisionState.prototype);\nPlusLoopbackState.prototype.constructor = PlusLoopbackState;\n\n\n// Start of {@code (A|B|...)+} loop. Technically a decision state, but\n//  we don't use for code generation; somebody might need it, so I'm defining\n//  it for completeness. In reality, the {@link PlusLoopbackState} node is the\n//  real decision-making note for {@code A+}.\n//\nfunction PlusBlockStartState() {\n\tBlockStartState.call(this);\n\tthis.stateType = ATNState.PLUS_BLOCK_START;\n    this.loopBackState = null;\n    return this;\n}\n\nPlusBlockStartState.prototype = Object.create(BlockStartState.prototype);\nPlusBlockStartState.prototype.constructor = PlusBlockStartState;\n\n// The block that begins a closure loop.\nfunction StarBlockStartState() {\n\tBlockStartState.call(this);\n\tthis.stateType = ATNState.STAR_BLOCK_START;\n\treturn this;\n}\n\nStarBlockStartState.prototype = Object.create(BlockStartState.prototype);\nStarBlockStartState.prototype.constructor = StarBlockStartState;\n\n\nfunction StarLoopbackState() {\n\tATNState.call(this);\n\tthis.stateType = ATNState.STAR_LOOP_BACK;\n\treturn this;\n}\n\nStarLoopbackState.prototype = Object.create(ATNState.prototype);\nStarLoopbackState.prototype.constructor = StarLoopbackState;\n\n\nfunction StarLoopEntryState() {\n\tDecisionState.call(this);\n\tthis.stateType = ATNState.STAR_LOOP_ENTRY;\n    this.loopBackState = null;\n    // Indicates whether this state can benefit from a precedence DFA during SLL decision making.\n    this.isPrecedenceDecision = null;\n    return this;\n}\n\nStarLoopEntryState.prototype = Object.create(DecisionState.prototype);\nStarLoopEntryState.prototype.constructor = StarLoopEntryState;\n\n\n// Mark the end of a * or + loop.\nfunction LoopEndState() {\n\tATNState.call(this);\n\tthis.stateType = ATNState.LOOP_END;\n\tthis.loopBackState = null;\n\treturn this;\n}\n\nLoopEndState.prototype = Object.create(ATNState.prototype);\nLoopEndState.prototype.constructor = LoopEndState;\n\n\n// The Tokens rule start state linking to each lexer rule start state */\nfunction TokensStartState() {\n\tDecisionState.call(this);\n\tthis.stateType = ATNState.TOKEN_START;\n\treturn this;\n}\n\nTokensStartState.prototype = Object.create(DecisionState.prototype);\nTokensStartState.prototype.constructor = TokensStartState;\n\nexports.ATNState = ATNState;\nexports.BasicState = BasicState;\nexports.DecisionState = DecisionState;\nexports.BlockStartState = BlockStartState;\nexports.BlockEndState = BlockEndState;\nexports.LoopEndState = LoopEndState;\nexports.RuleStartState = RuleStartState;\nexports.RuleStopState = RuleStopState;\nexports.TokensStartState = TokensStartState;\nexports.PlusLoopbackState = PlusLoopbackState;\nexports.StarLoopbackState = StarLoopbackState;\nexports.StarLoopEntryState = StarLoopEntryState;\nexports.PlusBlockStartState = PlusBlockStartState;\nexports.StarBlockStartState = StarBlockStartState;\nexports.BasicBlockStartState = BasicBlockStartState;\n","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n///\n\n// Represents the type of recognizer an ATN applies to.\n\nfunction ATNType() {\n\n}\n\nATNType.LEXER = 0;\nATNType.PARSER = 1;\n\nexports.ATNType = ATNType;\n\n","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n///\n\n// When we hit an accept state in either the DFA or the ATN, we\n//  have to notify the character stream to start buffering characters\n//  via {@link IntStream//mark} and record the current state. The current sim state\n//  includes the current index into the input, the current line,\n//  and current character position in that line. Note that the Lexer is\n//  tracking the starting line and characterization of the token. These\n//  variables track the \"state\" of the simulator when it hits an accept state.\n//\n//  <p>We track these variables separately for the DFA and ATN simulation\n//  because the DFA simulation often has to fail over to the ATN\n//  simulation. If the ATN simulation fails, we need the DFA to fall\n//  back to its previously accepted state, if any. If the ATN succeeds,\n//  then the ATN does the accept and the DFA simulator that invoked it\n//  can simply return the predicted token type.</p>\n///\n\nvar Token = require('./../Token').Token;\nvar Lexer = require('./../Lexer').Lexer;\nvar ATN = require('./ATN').ATN;\nvar ATNSimulator = require('./ATNSimulator').ATNSimulator;\nvar DFAState = require('./../dfa/DFAState').DFAState;\nvar ATNConfigSet = require('./ATNConfigSet').ATNConfigSet;\nvar OrderedATNConfigSet = require('./ATNConfigSet').OrderedATNConfigSet;\nvar PredictionContext = require('./../PredictionContext').PredictionContext;\nvar SingletonPredictionContext = require('./../PredictionContext').SingletonPredictionContext;\nvar RuleStopState = require('./ATNState').RuleStopState;\nvar LexerATNConfig = require('./ATNConfig').LexerATNConfig;\nvar Transition = require('./Transition').Transition;\nvar LexerActionExecutor = require('./LexerActionExecutor').LexerActionExecutor;\nvar LexerNoViableAltException = require('./../error/Errors').LexerNoViableAltException;\n\nfunction resetSimState(sim) {\n\tsim.index = -1;\n\tsim.line = 0;\n\tsim.column = -1;\n\tsim.dfaState = null;\n}\n\nfunction SimState() {\n\tresetSimState(this);\n\treturn this;\n}\n\nSimState.prototype.reset = function() {\n\tresetSimState(this);\n};\n\nfunction LexerATNSimulator(recog, atn, decisionToDFA, sharedContextCache) {\n\tATNSimulator.call(this, atn, sharedContextCache);\n\tthis.decisionToDFA = decisionToDFA;\n\tthis.recog = recog;\n\t// The current token's starting index into the character stream.\n\t// Shared across DFA to ATN simulation in case the ATN fails and the\n\t// DFA did not have a previous accept state. In this case, we use the\n\t// ATN-generated exception object.\n\tthis.startIndex = -1;\n\t// line number 1..n within the input///\n\tthis.line = 1;\n\t// The index of the character relative to the beginning of the line\n\t// 0..n-1///\n\tthis.column = 0;\n\tthis.mode = Lexer.DEFAULT_MODE;\n\t// Used during DFA/ATN exec to record the most recent accept configuration\n\t// info\n\tthis.prevAccept = new SimState();\n\t// done\n\treturn this;\n}\n\nLexerATNSimulator.prototype = Object.create(ATNSimulator.prototype);\nLexerATNSimulator.prototype.constructor = LexerATNSimulator;\n\nLexerATNSimulator.debug = false;\nLexerATNSimulator.dfa_debug = false;\n\nLexerATNSimulator.MIN_DFA_EDGE = 0;\nLexerATNSimulator.MAX_DFA_EDGE = 127; // forces unicode to stay in ATN\n\nLexerATNSimulator.match_calls = 0;\n\nLexerATNSimulator.prototype.copyState = function(simulator) {\n\tthis.column = simulator.column;\n\tthis.line = simulator.line;\n\tthis.mode = simulator.mode;\n\tthis.startIndex = simulator.startIndex;\n};\n\nLexerATNSimulator.prototype.match = function(input, mode) {\n\tthis.match_calls += 1;\n\tthis.mode = mode;\n\tvar mark = input.mark();\n\ttry {\n\t\tthis.startIndex = input.index;\n\t\tthis.prevAccept.reset();\n\t\tvar dfa = this.decisionToDFA[mode];\n\t\tif (dfa.s0 === null) {\n\t\t\treturn this.matchATN(input);\n\t\t} else {\n\t\t\treturn this.execATN(input, dfa.s0);\n\t\t}\n\t} finally {\n\t\tinput.release(mark);\n\t}\n};\n\nLexerATNSimulator.prototype.reset = function() {\n\tthis.prevAccept.reset();\n\tthis.startIndex = -1;\n\tthis.line = 1;\n\tthis.column = 0;\n\tthis.mode = Lexer.DEFAULT_MODE;\n};\n\nLexerATNSimulator.prototype.matchATN = function(input) {\n\tvar startState = this.atn.modeToStartState[this.mode];\n\n\tif (LexerATNSimulator.debug) {\n\t\tconsole.log(\"matchATN mode \" + this.mode + \" start: \" + startState);\n\t}\n\tvar old_mode = this.mode;\n\tvar s0_closure = this.computeStartState(input, startState);\n\tvar suppressEdge = s0_closure.hasSemanticContext;\n\ts0_closure.hasSemanticContext = false;\n\n\tvar next = this.addDFAState(s0_closure);\n\tif (!suppressEdge) {\n\t\tthis.decisionToDFA[this.mode].s0 = next;\n\t}\n\n\tvar predict = this.execATN(input, next);\n\n\tif (LexerATNSimulator.debug) {\n\t\tconsole.log(\"DFA after matchATN: \" + this.decisionToDFA[old_mode].toLexerString());\n\t}\n\treturn predict;\n};\n\nLexerATNSimulator.prototype.execATN = function(input, ds0) {\n\tif (LexerATNSimulator.debug) {\n\t\tconsole.log(\"start state closure=\" + ds0.configs);\n\t}\n\tif (ds0.isAcceptState) {\n\t\t// allow zero-length tokens\n\t\tthis.captureSimState(this.prevAccept, input, ds0);\n\t}\n\tvar t = input.LA(1);\n\tvar s = ds0; // s is current/from DFA state\n\n\twhile (true) { // while more work\n\t\tif (LexerATNSimulator.debug) {\n\t\t\tconsole.log(\"execATN loop starting closure: \" + s.configs);\n\t\t}\n\n\t\t// As we move src->trg, src->trg, we keep track of the previous trg to\n\t\t// avoid looking up the DFA state again, which is expensive.\n\t\t// If the previous target was already part of the DFA, we might\n\t\t// be able to avoid doing a reach operation upon t. If s!=null,\n\t\t// it means that semantic predicates didn't prevent us from\n\t\t// creating a DFA state. Once we know s!=null, we check to see if\n\t\t// the DFA state has an edge already for t. If so, we can just reuse\n\t\t// it's configuration set; there's no point in re-computing it.\n\t\t// This is kind of like doing DFA simulation within the ATN\n\t\t// simulation because DFA simulation is really just a way to avoid\n\t\t// computing reach/closure sets. Technically, once we know that\n\t\t// we have a previously added DFA state, we could jump over to\n\t\t// the DFA simulator. But, that would mean popping back and forth\n\t\t// a lot and making things more complicated algorithmically.\n\t\t// This optimization makes a lot of sense for loops within DFA.\n\t\t// A character will take us back to an existing DFA state\n\t\t// that already has lots of edges out of it. e.g., .* in comments.\n\t\t// print(\"Target for:\" + str(s) + \" and:\" + str(t))\n\t\tvar target = this.getExistingTargetState(s, t);\n\t\t// print(\"Existing:\" + str(target))\n\t\tif (target === null) {\n\t\t\ttarget = this.computeTargetState(input, s, t);\n\t\t\t// print(\"Computed:\" + str(target))\n\t\t}\n\t\tif (target === ATNSimulator.ERROR) {\n\t\t\tbreak;\n\t\t}\n\t\t// If this is a consumable input element, make sure to consume before\n\t\t// capturing the accept state so the input index, line, and char\n\t\t// position accurately reflect the state of the interpreter at the\n\t\t// end of the token.\n\t\tif (t !== Token.EOF) {\n\t\t\tthis.consume(input);\n\t\t}\n\t\tif (target.isAcceptState) {\n\t\t\tthis.captureSimState(this.prevAccept, input, target);\n\t\t\tif (t === Token.EOF) {\n\t\t\t\tbreak;\n\t\t\t}\n\t\t}\n\t\tt = input.LA(1);\n\t\ts = target; // flip; current DFA target becomes new src/from state\n\t}\n\treturn this.failOrAccept(this.prevAccept, input, s.configs, t);\n};\n\n// Get an existing target state for an edge in the DFA. If the target state\n// for the edge has not yet been computed or is otherwise not available,\n// this method returns {@code null}.\n//\n// @param s The current DFA state\n// @param t The next input symbol\n// @return The existing target DFA state for the given input symbol\n// {@code t}, or {@code null} if the target state for this edge is not\n// already cached\nLexerATNSimulator.prototype.getExistingTargetState = function(s, t) {\n\tif (s.edges === null || t < LexerATNSimulator.MIN_DFA_EDGE || t > LexerATNSimulator.MAX_DFA_EDGE) {\n\t\treturn null;\n\t}\n\n\tvar target = s.edges[t - LexerATNSimulator.MIN_DFA_EDGE];\n\tif(target===undefined) {\n\t\ttarget = null;\n\t}\n\tif (LexerATNSimulator.debug && target !== null) {\n\t\tconsole.log(\"reuse state \" + s.stateNumber + \" edge to \" + target.stateNumber);\n\t}\n\treturn target;\n};\n\n// Compute a target state for an edge in the DFA, and attempt to add the\n// computed state and corresponding edge to the DFA.\n//\n// @param input The input stream\n// @param s The current DFA state\n// @param t The next input symbol\n//\n// @return The computed target DFA state for the given input symbol\n// {@code t}. If {@code t} does not lead to a valid DFA state, this method\n// returns {@link //ERROR}.\nLexerATNSimulator.prototype.computeTargetState = function(input, s, t) {\n\tvar reach = new OrderedATNConfigSet();\n\t// if we don't find an existing DFA state\n\t// Fill reach starting from closure, following t transitions\n\tthis.getReachableConfigSet(input, s.configs, reach, t);\n\n\tif (reach.items.length === 0) { // we got nowhere on t from s\n\t\tif (!reach.hasSemanticContext) {\n\t\t\t// we got nowhere on t, don't throw out this knowledge; it'd\n\t\t\t// cause a failover from DFA later.\n\t\t\tthis.addDFAEdge(s, t, ATNSimulator.ERROR);\n\t\t}\n\t\t// stop when we can't match any more char\n\t\treturn ATNSimulator.ERROR;\n\t}\n\t// Add an edge from s to target DFA found/created for reach\n\treturn this.addDFAEdge(s, t, null, reach);\n};\n\nLexerATNSimulator.prototype.failOrAccept = function(prevAccept, input, reach, t) {\n\tif (this.prevAccept.dfaState !== null) {\n\t\tvar lexerActionExecutor = prevAccept.dfaState.lexerActionExecutor;\n\t\tthis.accept(input, lexerActionExecutor, this.startIndex,\n\t\t\t\tprevAccept.index, prevAccept.line, prevAccept.column);\n\t\treturn prevAccept.dfaState.prediction;\n\t} else {\n\t\t// if no accept and EOF is first char, return EOF\n\t\tif (t === Token.EOF && input.index === this.startIndex) {\n\t\t\treturn Token.EOF;\n\t\t}\n\t\tthrow new LexerNoViableAltException(this.recog, input, this.startIndex, reach);\n\t}\n};\n\n// Given a starting configuration set, figure out all ATN configurations\n// we can reach upon input {@code t}. Parameter {@code reach} is a return\n// parameter.\nLexerATNSimulator.prototype.getReachableConfigSet = function(input, closure,\n\t\treach, t) {\n\t// this is used to skip processing for configs which have a lower priority\n\t// than a config that already reached an accept state for the same rule\n\tvar skipAlt = ATN.INVALID_ALT_NUMBER;\n\tfor (var i = 0; i < closure.items.length; i++) {\n\t\tvar cfg = closure.items[i];\n\t\tvar currentAltReachedAcceptState = (cfg.alt === skipAlt);\n\t\tif (currentAltReachedAcceptState && cfg.passedThroughNonGreedyDecision) {\n\t\t\tcontinue;\n\t\t}\n\t\tif (LexerATNSimulator.debug) {\n\t\t\tconsole.log(\"testing %s at %s\\n\", this.getTokenName(t), cfg\n\t\t\t\t\t.toString(this.recog, true));\n\t\t}\n\t\tfor (var j = 0; j < cfg.state.transitions.length; j++) {\n\t\t\tvar trans = cfg.state.transitions[j]; // for each transition\n\t\t\tvar target = this.getReachableTarget(trans, t);\n\t\t\tif (target !== null) {\n\t\t\t\tvar lexerActionExecutor = cfg.lexerActionExecutor;\n\t\t\t\tif (lexerActionExecutor !== null) {\n\t\t\t\t\tlexerActionExecutor = lexerActionExecutor.fixOffsetBeforeMatch(input.index - this.startIndex);\n\t\t\t\t}\n\t\t\t\tvar treatEofAsEpsilon = (t === Token.EOF);\n\t\t\t\tvar config = new LexerATNConfig({state:target, lexerActionExecutor:lexerActionExecutor}, cfg);\n\t\t\t\tif (this.closure(input, config, reach,\n\t\t\t\t\t\tcurrentAltReachedAcceptState, true, treatEofAsEpsilon)) {\n\t\t\t\t\t// any remaining configs for this alt have a lower priority\n\t\t\t\t\t// than the one that just reached an accept state.\n\t\t\t\t\tskipAlt = cfg.alt;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n};\n\nLexerATNSimulator.prototype.accept = function(input, lexerActionExecutor,\n\t\tstartIndex, index, line, charPos) {\n\tif (LexerATNSimulator.debug) {\n\t\tconsole.log(\"ACTION %s\\n\", lexerActionExecutor);\n\t}\n\t// seek to after last char in token\n\tinput.seek(index);\n\tthis.line = line;\n\tthis.column = charPos;\n\tif (lexerActionExecutor !== null && this.recog !== null) {\n\t\tlexerActionExecutor.execute(this.recog, input, startIndex);\n\t}\n};\n\nLexerATNSimulator.prototype.getReachableTarget = function(trans, t) {\n\tif (trans.matches(t, 0, Lexer.MAX_CHAR_VALUE)) {\n\t\treturn trans.target;\n\t} else {\n\t\treturn null;\n\t}\n};\n\nLexerATNSimulator.prototype.computeStartState = function(input, p) {\n\tvar initialContext = PredictionContext.EMPTY;\n\tvar configs = new OrderedATNConfigSet();\n\tfor (var i = 0; i < p.transitions.length; i++) {\n\t\tvar target = p.transitions[i].target;\n        var cfg = new LexerATNConfig({state:target, alt:i+1, context:initialContext}, null);\n\t\tthis.closure(input, cfg, configs, false, false, false);\n\t}\n\treturn configs;\n};\n\n// Since the alternatives within any lexer decision are ordered by\n// preference, this method stops pursuing the closure as soon as an accept\n// state is reached. After the first accept state is reached by depth-first\n// search from {@code config}, all other (potentially reachable) states for\n// this rule would have a lower priority.\n//\n// @return {@code true} if an accept state is reached, otherwise\n// {@code false}.\nLexerATNSimulator.prototype.closure = function(input, config, configs,\n\t\tcurrentAltReachedAcceptState, speculative, treatEofAsEpsilon) {\n\tvar cfg = null;\n\tif (LexerATNSimulator.debug) {\n\t\tconsole.log(\"closure(\" + config.toString(this.recog, true) + \")\");\n\t}\n\tif (config.state instanceof RuleStopState) {\n\t\tif (LexerATNSimulator.debug) {\n\t\t\tif (this.recog !== null) {\n\t\t\t\tconsole.log(\"closure at %s rule stop %s\\n\", this.recog.ruleNames[config.state.ruleIndex], config);\n\t\t\t} else {\n\t\t\t\tconsole.log(\"closure at rule stop %s\\n\", config);\n\t\t\t}\n\t\t}\n\t\tif (config.context === null || config.context.hasEmptyPath()) {\n\t\t\tif (config.context === null || config.context.isEmpty()) {\n\t\t\t\tconfigs.add(config);\n\t\t\t\treturn true;\n\t\t\t} else {\n\t\t\t\tconfigs.add(new LexerATNConfig({ state:config.state, context:PredictionContext.EMPTY}, config));\n\t\t\t\tcurrentAltReachedAcceptState = true;\n\t\t\t}\n\t\t}\n\t\tif (config.context !== null && !config.context.isEmpty()) {\n\t\t\tfor (var i = 0; i < config.context.length; i++) {\n\t\t\t\tif (config.context.getReturnState(i) !== PredictionContext.EMPTY_RETURN_STATE) {\n\t\t\t\t\tvar newContext = config.context.getParent(i); // \"pop\" return state\n\t\t\t\t\tvar returnState = this.atn.states[config.context.getReturnState(i)];\n\t\t\t\t\tcfg = new LexerATNConfig({ state:returnState, context:newContext }, config);\n\t\t\t\t\tcurrentAltReachedAcceptState = this.closure(input, cfg,\n\t\t\t\t\t\t\tconfigs, currentAltReachedAcceptState, speculative,\n\t\t\t\t\t\t\ttreatEofAsEpsilon);\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn currentAltReachedAcceptState;\n\t}\n\t// optimization\n\tif (!config.state.epsilonOnlyTransitions) {\n\t\tif (!currentAltReachedAcceptState || !config.passedThroughNonGreedyDecision) {\n\t\t\tconfigs.add(config);\n\t\t}\n\t}\n\tfor (var j = 0; j < config.state.transitions.length; j++) {\n\t\tvar trans = config.state.transitions[j];\n\t\tcfg = this.getEpsilonTarget(input, config, trans, configs, speculative, treatEofAsEpsilon);\n\t\tif (cfg !== null) {\n\t\t\tcurrentAltReachedAcceptState = this.closure(input, cfg, configs,\n\t\t\t\t\tcurrentAltReachedAcceptState, speculative, treatEofAsEpsilon);\n\t\t}\n\t}\n\treturn currentAltReachedAcceptState;\n};\n\n// side-effect: can alter configs.hasSemanticContext\nLexerATNSimulator.prototype.getEpsilonTarget = function(input, config, trans,\n\t\tconfigs, speculative, treatEofAsEpsilon) {\n\tvar cfg = null;\n\tif (trans.serializationType === Transition.RULE) {\n\t\tvar newContext = SingletonPredictionContext.create(config.context, trans.followState.stateNumber);\n\t\tcfg = new LexerATNConfig( { state:trans.target, context:newContext}, config);\n\t} else if (trans.serializationType === Transition.PRECEDENCE) {\n\t\tthrow \"Precedence predicates are not supported in lexers.\";\n\t} else if (trans.serializationType === Transition.PREDICATE) {\n\t\t// Track traversing semantic predicates. If we traverse,\n\t\t// we cannot add a DFA state for this \"reach\" computation\n\t\t// because the DFA would not test the predicate again in the\n\t\t// future. Rather than creating collections of semantic predicates\n\t\t// like v3 and testing them on prediction, v4 will test them on the\n\t\t// fly all the time using the ATN not the DFA. This is slower but\n\t\t// semantically it's not used that often. One of the key elements to\n\t\t// this predicate mechanism is not adding DFA states that see\n\t\t// predicates immediately afterwards in the ATN. For example,\n\n\t\t// a : ID {p1}? | ID {p2}? ;\n\n\t\t// should create the start state for rule 'a' (to save start state\n\t\t// competition), but should not create target of ID state. The\n\t\t// collection of ATN states the following ID references includes\n\t\t// states reached by traversing predicates. Since this is when we\n\t\t// test them, we cannot cash the DFA state target of ID.\n\n\t\tif (LexerATNSimulator.debug) {\n\t\t\tconsole.log(\"EVAL rule \" + trans.ruleIndex + \":\" + trans.predIndex);\n\t\t}\n\t\tconfigs.hasSemanticContext = true;\n\t\tif (this.evaluatePredicate(input, trans.ruleIndex, trans.predIndex, speculative)) {\n\t\t\tcfg = new LexerATNConfig({ state:trans.target}, config);\n\t\t}\n\t} else if (trans.serializationType === Transition.ACTION) {\n\t\tif (config.context === null || config.context.hasEmptyPath()) {\n\t\t\t// execute actions anywhere in the start rule for a token.\n\t\t\t//\n\t\t\t// TODO: if the entry rule is invoked recursively, some\n\t\t\t// actions may be executed during the recursive call. The\n\t\t\t// problem can appear when hasEmptyPath() is true but\n\t\t\t// isEmpty() is false. In this case, the config needs to be\n\t\t\t// split into two contexts - one with just the empty path\n\t\t\t// and another with everything but the empty path.\n\t\t\t// Unfortunately, the current algorithm does not allow\n\t\t\t// getEpsilonTarget to return two configurations, so\n\t\t\t// additional modifications are needed before we can support\n\t\t\t// the split operation.\n\t\t\tvar lexerActionExecutor = LexerActionExecutor.append(config.lexerActionExecutor,\n\t\t\t\t\tthis.atn.lexerActions[trans.actionIndex]);\n\t\t\tcfg = new LexerATNConfig({ state:trans.target, lexerActionExecutor:lexerActionExecutor }, config);\n\t\t} else {\n\t\t\t// ignore actions in referenced rules\n\t\t\tcfg = new LexerATNConfig( { state:trans.target}, config);\n\t\t}\n\t} else if (trans.serializationType === Transition.EPSILON) {\n\t\tcfg = new LexerATNConfig({ state:trans.target}, config);\n\t} else if (trans.serializationType === Transition.ATOM ||\n\t\t\t\ttrans.serializationType === Transition.RANGE ||\n\t\t\t\ttrans.serializationType === Transition.SET) {\n\t\tif (treatEofAsEpsilon) {\n\t\t\tif (trans.matches(Token.EOF, 0, Lexer.MAX_CHAR_VALUE)) {\n\t\t\t\tcfg = new LexerATNConfig( { state:trans.target }, config);\n\t\t\t}\n\t\t}\n\t}\n\treturn cfg;\n};\n\n// Evaluate a predicate specified in the lexer.\n//\n// <p>If {@code speculative} is {@code true}, this method was called before\n// {@link //consume} for the matched character. This method should call\n// {@link //consume} before evaluating the predicate to ensure position\n// sensitive values, including {@link Lexer//getText}, {@link Lexer//getLine},\n// and {@link Lexer//getcolumn}, properly reflect the current\n// lexer state. This method should restore {@code input} and the simulator\n// to the original state before returning (i.e. undo the actions made by the\n// call to {@link //consume}.</p>\n//\n// @param input The input stream.\n// @param ruleIndex The rule containing the predicate.\n// @param predIndex The index of the predicate within the rule.\n// @param speculative {@code true} if the current index in {@code input} is\n// one character before the predicate's location.\n//\n// @return {@code true} if the specified predicate evaluates to\n// {@code true}.\n// /\nLexerATNSimulator.prototype.evaluatePredicate = function(input, ruleIndex,\n\t\tpredIndex, speculative) {\n\t// assume true if no recognizer was provided\n\tif (this.recog === null) {\n\t\treturn true;\n\t}\n\tif (!speculative) {\n\t\treturn this.recog.sempred(null, ruleIndex, predIndex);\n\t}\n\tvar savedcolumn = this.column;\n\tvar savedLine = this.line;\n\tvar index = input.index;\n\tvar marker = input.mark();\n\ttry {\n\t\tthis.consume(input);\n\t\treturn this.recog.sempred(null, ruleIndex, predIndex);\n\t} finally {\n\t\tthis.column = savedcolumn;\n\t\tthis.line = savedLine;\n\t\tinput.seek(index);\n\t\tinput.release(marker);\n\t}\n};\n\nLexerATNSimulator.prototype.captureSimState = function(settings, input, dfaState) {\n\tsettings.index = input.index;\n\tsettings.line = this.line;\n\tsettings.column = this.column;\n\tsettings.dfaState = dfaState;\n};\n\nLexerATNSimulator.prototype.addDFAEdge = function(from_, tk, to, cfgs) {\n\tif (to === undefined) {\n\t\tto = null;\n\t}\n\tif (cfgs === undefined) {\n\t\tcfgs = null;\n\t}\n\tif (to === null && cfgs !== null) {\n\t\t// leading to this call, ATNConfigSet.hasSemanticContext is used as a\n\t\t// marker indicating dynamic predicate evaluation makes this edge\n\t\t// dependent on the specific input sequence, so the static edge in the\n\t\t// DFA should be omitted. The target DFAState is still created since\n\t\t// execATN has the ability to resynchronize with the DFA state cache\n\t\t// following the predicate evaluation step.\n\t\t//\n\t\t// TJP notes: next time through the DFA, we see a pred again and eval.\n\t\t// If that gets us to a previously created (but dangling) DFA\n\t\t// state, we can continue in pure DFA mode from there.\n\t\t// /\n\t\tvar suppressEdge = cfgs.hasSemanticContext;\n\t\tcfgs.hasSemanticContext = false;\n\n\t\tto = this.addDFAState(cfgs);\n\n\t\tif (suppressEdge) {\n\t\t\treturn to;\n\t\t}\n\t}\n\t// add the edge\n\tif (tk < LexerATNSimulator.MIN_DFA_EDGE || tk > LexerATNSimulator.MAX_DFA_EDGE) {\n\t\t// Only track edges within the DFA bounds\n\t\treturn to;\n\t}\n\tif (LexerATNSimulator.debug) {\n\t\tconsole.log(\"EDGE \" + from_ + \" -> \" + to + \" upon \" + tk);\n\t}\n\tif (from_.edges === null) {\n\t\t// make room for tokens 1..n and -1 masquerading as index 0\n\t\tfrom_.edges = [];\n\t}\n\tfrom_.edges[tk - LexerATNSimulator.MIN_DFA_EDGE] = to; // connect\n\n\treturn to;\n};\n\n// Add a new DFA state if there isn't one with this set of\n// configurations already. This method also detects the first\n// configuration containing an ATN rule stop state. Later, when\n// traversing the DFA, we will know which rule to accept.\nLexerATNSimulator.prototype.addDFAState = function(configs) {\n\tvar proposed = new DFAState(null, configs);\n\tvar firstConfigWithRuleStopState = null;\n\tfor (var i = 0; i < configs.items.length; i++) {\n\t\tvar cfg = configs.items[i];\n\t\tif (cfg.state instanceof RuleStopState) {\n\t\t\tfirstConfigWithRuleStopState = cfg;\n\t\t\tbreak;\n\t\t}\n\t}\n\tif (firstConfigWithRuleStopState !== null) {\n\t\tproposed.isAcceptState = true;\n\t\tproposed.lexerActionExecutor = firstConfigWithRuleStopState.lexerActionExecutor;\n\t\tproposed.prediction = this.atn.ruleToTokenType[firstConfigWithRuleStopState.state.ruleIndex];\n\t}\n\tvar dfa = this.decisionToDFA[this.mode];\n\tvar existing = dfa.states.get(proposed);\n\tif (existing!==null) {\n\t\treturn existing;\n\t}\n\tvar newState = proposed;\n\tnewState.stateNumber = dfa.states.length;\n\tconfigs.setReadonly(true);\n\tnewState.configs = configs;\n\tdfa.states.add(newState);\n\treturn newState;\n};\n\nLexerATNSimulator.prototype.getDFA = function(mode) {\n\treturn this.decisionToDFA[mode];\n};\n\n// Get the text matched so far for the current token.\nLexerATNSimulator.prototype.getText = function(input) {\n\t// index is first lookahead char, don't include.\n\treturn input.getText(this.startIndex, input.index - 1);\n};\n\nLexerATNSimulator.prototype.consume = function(input) {\n\tvar curChar = input.LA(1);\n\tif (curChar === \"\\n\".charCodeAt(0)) {\n\t\tthis.line += 1;\n\t\tthis.column = 0;\n\t} else {\n\t\tthis.column += 1;\n\t}\n\tinput.consume();\n};\n\nLexerATNSimulator.prototype.getTokenName = function(tt) {\n\tif (tt === -1) {\n\t\treturn \"EOF\";\n\t} else {\n\t\treturn \"'\" + String.fromCharCode(tt) + \"'\";\n\t}\n};\n\nexports.LexerATNSimulator = LexerATNSimulator;\n","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n //\n\nfunction LexerActionType() {\n}\n\nLexerActionType.CHANNEL = 0;     //The type of a {@link LexerChannelAction} action.\nLexerActionType.CUSTOM = 1;      //The type of a {@link LexerCustomAction} action.\nLexerActionType.MODE = 2;        //The type of a {@link LexerModeAction} action.\nLexerActionType.MORE = 3;        //The type of a {@link LexerMoreAction} action.\nLexerActionType.POP_MODE = 4;    //The type of a {@link LexerPopModeAction} action.\nLexerActionType.PUSH_MODE = 5;   //The type of a {@link LexerPushModeAction} action.\nLexerActionType.SKIP = 6;        //The type of a {@link LexerSkipAction} action.\nLexerActionType.TYPE = 7;        //The type of a {@link LexerTypeAction} action.\n\nfunction LexerAction(action) {\n    this.actionType = action;\n    this.isPositionDependent = false;\n    return this;\n}\n\nLexerAction.prototype.hashCode = function() {\n    var hash = new Hash();\n    this.updateHashCode(hash);\n    return hash.finish()\n};\n\nLexerAction.prototype.updateHashCode = function(hash) {\n    hash.update(this.actionType);\n};\n\nLexerAction.prototype.equals = function(other) {\n    return this === other;\n};\n\n\n\n//\n// Implements the {@code skip} lexer action by calling {@link Lexer//skip}.\n//\n// <p>The {@code skip} command does not have any parameters, so this action is\n// implemented as a singleton instance exposed by {@link //INSTANCE}.</p>\nfunction LexerSkipAction() {\n\tLexerAction.call(this, LexerActionType.SKIP);\n\treturn this;\n}\n\nLexerSkipAction.prototype = Object.create(LexerAction.prototype);\nLexerSkipAction.prototype.constructor = LexerSkipAction;\n\n// Provides a singleton instance of this parameterless lexer action.\nLexerSkipAction.INSTANCE = new LexerSkipAction();\n\nLexerSkipAction.prototype.execute = function(lexer) {\n    lexer.skip();\n};\n\nLexerSkipAction.prototype.toString = function() {\n\treturn \"skip\";\n};\n\n//  Implements the {@code type} lexer action by calling {@link Lexer//setType}\n// with the assigned type.\nfunction LexerTypeAction(type) {\n\tLexerAction.call(this, LexerActionType.TYPE);\n\tthis.type = type;\n\treturn this;\n}\n\nLexerTypeAction.prototype = Object.create(LexerAction.prototype);\nLexerTypeAction.prototype.constructor = LexerTypeAction;\n\nLexerTypeAction.prototype.execute = function(lexer) {\n    lexer.type = this.type;\n};\n\nLexerTypeAction.prototype.updateHashCode = function(hash) {\n    hash.update(this.actionType, this.type);\n};\n\n\nLexerTypeAction.prototype.equals = function(other) {\n    if(this === other) {\n        return true;\n    } else if (! (other instanceof LexerTypeAction)) {\n        return false;\n    } else {\n        return this.type === other.type;\n    }\n};\n\nLexerTypeAction.prototype.toString = function() {\n    return \"type(\" + this.type + \")\";\n};\n\n// Implements the {@code pushMode} lexer action by calling\n// {@link Lexer//pushMode} with the assigned mode.\nfunction LexerPushModeAction(mode) {\n\tLexerAction.call(this, LexerActionType.PUSH_MODE);\n    this.mode = mode;\n    return this;\n}\n\nLexerPushModeAction.prototype = Object.create(LexerAction.prototype);\nLexerPushModeAction.prototype.constructor = LexerPushModeAction;\n\n// <p>This action is implemented by calling {@link Lexer//pushMode} with the\n// value provided by {@link //getMode}.</p>\nLexerPushModeAction.prototype.execute = function(lexer) {\n    lexer.pushMode(this.mode);\n};\n\nLexerPushModeAction.prototype.updateHashCode = function(hash) {\n    hash.update(this.actionType, this.mode);\n};\n\nLexerPushModeAction.prototype.equals = function(other) {\n    if (this === other) {\n        return true;\n    } else if (! (other instanceof LexerPushModeAction)) {\n        return false;\n    } else {\n        return this.mode === other.mode;\n    }\n};\n\nLexerPushModeAction.prototype.toString = function() {\n\treturn \"pushMode(\" + this.mode + \")\";\n};\n\n\n// Implements the {@code popMode} lexer action by calling {@link Lexer//popMode}.\n//\n// <p>The {@code popMode} command does not have any parameters, so this action is\n// implemented as a singleton instance exposed by {@link //INSTANCE}.</p>\nfunction LexerPopModeAction() {\n\tLexerAction.call(this,LexerActionType.POP_MODE);\n\treturn this;\n}\n\nLexerPopModeAction.prototype = Object.create(LexerAction.prototype);\nLexerPopModeAction.prototype.constructor = LexerPopModeAction;\n\nLexerPopModeAction.INSTANCE = new LexerPopModeAction();\n\n// <p>This action is implemented by calling {@link Lexer//popMode}.</p>\nLexerPopModeAction.prototype.execute = function(lexer) {\n    lexer.popMode();\n};\n\nLexerPopModeAction.prototype.toString = function() {\n\treturn \"popMode\";\n};\n\n// Implements the {@code more} lexer action by calling {@link Lexer//more}.\n//\n// <p>The {@code more} command does not have any parameters, so this action is\n// implemented as a singleton instance exposed by {@link //INSTANCE}.</p>\nfunction LexerMoreAction() {\n\tLexerAction.call(this, LexerActionType.MORE);\n\treturn this;\n}\n\nLexerMoreAction.prototype = Object.create(LexerAction.prototype);\nLexerMoreAction.prototype.constructor = LexerMoreAction;\n\nLexerMoreAction.INSTANCE = new LexerMoreAction();\n\n// <p>This action is implemented by calling {@link Lexer//popMode}.</p>\nLexerMoreAction.prototype.execute = function(lexer) {\n    lexer.more();\n};\n\nLexerMoreAction.prototype.toString = function() {\n    return \"more\";\n};\n\n\n// Implements the {@code mode} lexer action by calling {@link Lexer//mode} with\n// the assigned mode.\nfunction LexerModeAction(mode) {\n\tLexerAction.call(this, LexerActionType.MODE);\n    this.mode = mode;\n    return this;\n}\n\nLexerModeAction.prototype = Object.create(LexerAction.prototype);\nLexerModeAction.prototype.constructor = LexerModeAction;\n\n// <p>This action is implemented by calling {@link Lexer//mode} with the\n// value provided by {@link //getMode}.</p>\nLexerModeAction.prototype.execute = function(lexer) {\n    lexer.mode(this.mode);\n};\n\nLexerModeAction.prototype.updateHashCode = function(hash) {\n    hash.update(this.actionType, this.mode);\n};\n\nLexerModeAction.prototype.equals = function(other) {\n    if (this === other) {\n        return true;\n    } else if (! (other instanceof LexerModeAction)) {\n        return false;\n    } else {\n        return this.mode === other.mode;\n    }\n};\n\nLexerModeAction.prototype.toString = function() {\n    return \"mode(\" + this.mode + \")\";\n};\n\n// Executes a custom lexer action by calling {@link Recognizer//action} with the\n// rule and action indexes assigned to the custom action. The implementation of\n// a custom action is added to the generated code for the lexer in an override\n// of {@link Recognizer//action} when the grammar is compiled.\n//\n// <p>This class may represent embedded actions created with the <code>{...}</code>\n// syntax in ANTLR 4, as well as actions created for lexer commands where the\n// command argument could not be evaluated when the grammar was compiled.</p>\n\n\n    // Constructs a custom lexer action with the specified rule and action\n    // indexes.\n    //\n    // @param ruleIndex The rule index to use for calls to\n    // {@link Recognizer//action}.\n    // @param actionIndex The action index to use for calls to\n    // {@link Recognizer//action}.\n\nfunction LexerCustomAction(ruleIndex, actionIndex) {\n\tLexerAction.call(this, LexerActionType.CUSTOM);\n    this.ruleIndex = ruleIndex;\n    this.actionIndex = actionIndex;\n    this.isPositionDependent = true;\n    return this;\n}\n\nLexerCustomAction.prototype = Object.create(LexerAction.prototype);\nLexerCustomAction.prototype.constructor = LexerCustomAction;\n\n// <p>Custom actions are implemented by calling {@link Lexer//action} with the\n// appropriate rule and action indexes.</p>\nLexerCustomAction.prototype.execute = function(lexer) {\n    lexer.action(null, this.ruleIndex, this.actionIndex);\n};\n\nLexerCustomAction.prototype.updateHashCode = function(hash) {\n    hash.update(this.actionType, this.ruleIndex, this.actionIndex);\n};\n\nLexerCustomAction.prototype.equals = function(other) {\n    if (this === other) {\n        return true;\n    } else if (! (other instanceof LexerCustomAction)) {\n        return false;\n    } else {\n        return this.ruleIndex === other.ruleIndex && this.actionIndex === other.actionIndex;\n    }\n};\n\n// Implements the {@code channel} lexer action by calling\n// {@link Lexer//setChannel} with the assigned channel.\n// Constructs a new {@code channel} action with the specified channel value.\n// @param channel The channel value to pass to {@link Lexer//setChannel}.\nfunction LexerChannelAction(channel) {\n\tLexerAction.call(this, LexerActionType.CHANNEL);\n    this.channel = channel;\n    return this;\n}\n\nLexerChannelAction.prototype = Object.create(LexerAction.prototype);\nLexerChannelAction.prototype.constructor = LexerChannelAction;\n\n// <p>This action is implemented by calling {@link Lexer//setChannel} with the\n// value provided by {@link //getChannel}.</p>\nLexerChannelAction.prototype.execute = function(lexer) {\n    lexer._channel = this.channel;\n};\n\nLexerChannelAction.prototype.updateHashCode = function(hash) {\n    hash.update(this.actionType, this.channel);\n};\n\nLexerChannelAction.prototype.equals = function(other) {\n    if (this === other) {\n        return true;\n    } else if (! (other instanceof LexerChannelAction)) {\n        return false;\n    } else {\n        return this.channel === other.channel;\n    }\n};\n\nLexerChannelAction.prototype.toString = function() {\n    return \"channel(\" + this.channel + \")\";\n};\n\n// This implementation of {@link LexerAction} is used for tracking input offsets\n// for position-dependent actions within a {@link LexerActionExecutor}.\n//\n// <p>This action is not serialized as part of the ATN, and is only required for\n// position-dependent lexer actions which appear at a location other than the\n// end of a rule. For more information about DFA optimizations employed for\n// lexer actions, see {@link LexerActionExecutor//append} and\n// {@link LexerActionExecutor//fixOffsetBeforeMatch}.</p>\n\n// Constructs a new indexed custom action by associating a character offset\n// with a {@link LexerAction}.\n//\n// <p>Note: This class is only required for lexer actions for which\n// {@link LexerAction//isPositionDependent} returns {@code true}.</p>\n//\n// @param offset The offset into the input {@link CharStream}, relative to\n// the token start index, at which the specified lexer action should be\n// executed.\n// @param action The lexer action to execute at a particular offset in the\n// input {@link CharStream}.\nfunction LexerIndexedCustomAction(offset, action) {\n\tLexerAction.call(this, action.actionType);\n    this.offset = offset;\n    this.action = action;\n    this.isPositionDependent = true;\n    return this;\n}\n\nLexerIndexedCustomAction.prototype = Object.create(LexerAction.prototype);\nLexerIndexedCustomAction.prototype.constructor = LexerIndexedCustomAction;\n\n// <p>This method calls {@link //execute} on the result of {@link //getAction}\n// using the provided {@code lexer}.</p>\nLexerIndexedCustomAction.prototype.execute = function(lexer) {\n    // assume the input stream position was properly set by the calling code\n    this.action.execute(lexer);\n};\n\nLexerIndexedCustomAction.prototype.updateHashCode = function(hash) {\n    hash.update(this.actionType, this.offset, this.action);\n};\n\nLexerIndexedCustomAction.prototype.equals = function(other) {\n    if (this === other) {\n        return true;\n    } else if (! (other instanceof LexerIndexedCustomAction)) {\n        return false;\n    } else {\n        return this.offset === other.offset && this.action === other.action;\n    }\n};\n\n\nexports.LexerActionType = LexerActionType;\nexports.LexerSkipAction = LexerSkipAction;\nexports.LexerChannelAction = LexerChannelAction;\nexports.LexerCustomAction = LexerCustomAction;\nexports.LexerIndexedCustomAction = LexerIndexedCustomAction;\nexports.LexerMoreAction = LexerMoreAction;\nexports.LexerTypeAction = LexerTypeAction;\nexports.LexerPushModeAction = LexerPushModeAction;\nexports.LexerPopModeAction = LexerPopModeAction;\nexports.LexerModeAction = LexerModeAction;","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n///\n\n// Represents an executor for a sequence of lexer actions which traversed during\n// the matching operation of a lexer rule (token).\n//\n// <p>The executor tracks position information for position-dependent lexer actions\n// efficiently, ensuring that actions appearing only at the end of the rule do\n// not cause bloating of the {@link DFA} created for the lexer.</p>\n\nvar hashStuff = require(\"../Utils\").hashStuff;\nvar LexerIndexedCustomAction = require('./LexerAction').LexerIndexedCustomAction;\n\nfunction LexerActionExecutor(lexerActions) {\n\tthis.lexerActions = lexerActions === null ? [] : lexerActions;\n\t// Caches the result of {@link //hashCode} since the hash code is an element\n\t// of the performance-critical {@link LexerATNConfig//hashCode} operation.\n\tthis.cachedHashCode = hashStuff(lexerActions); // \"\".join([str(la) for la in\n\t// lexerActions]))\n\treturn this;\n}\n\n// Creates a {@link LexerActionExecutor} which executes the actions for\n// the input {@code lexerActionExecutor} followed by a specified\n// {@code lexerAction}.\n//\n// @param lexerActionExecutor The executor for actions already traversed by\n// the lexer while matching a token within a particular\n// {@link LexerATNConfig}. If this is {@code null}, the method behaves as\n// though it were an empty executor.\n// @param lexerAction The lexer action to execute after the actions\n// specified in {@code lexerActionExecutor}.\n//\n// @return A {@link LexerActionExecutor} for executing the combine actions\n// of {@code lexerActionExecutor} and {@code lexerAction}.\nLexerActionExecutor.append = function(lexerActionExecutor, lexerAction) {\n\tif (lexerActionExecutor === null) {\n\t\treturn new LexerActionExecutor([ lexerAction ]);\n\t}\n\tvar lexerActions = lexerActionExecutor.lexerActions.concat([ lexerAction ]);\n\treturn new LexerActionExecutor(lexerActions);\n};\n\n// Creates a {@link LexerActionExecutor} which encodes the current offset\n// for position-dependent lexer actions.\n//\n// <p>Normally, when the executor encounters lexer actions where\n// {@link LexerAction//isPositionDependent} returns {@code true}, it calls\n// {@link IntStream//seek} on the input {@link CharStream} to set the input\n// position to the <em>end</em> of the current token. This behavior provides\n// for efficient DFA representation of lexer actions which appear at the end\n// of a lexer rule, even when the lexer rule matches a variable number of\n// characters.</p>\n//\n// <p>Prior to traversing a match transition in the ATN, the current offset\n// from the token start index is assigned to all position-dependent lexer\n// actions which have not already been assigned a fixed offset. By storing\n// the offsets relative to the token start index, the DFA representation of\n// lexer actions which appear in the middle of tokens remains efficient due\n// to sharing among tokens of the same length, regardless of their absolute\n// position in the input stream.</p>\n//\n// <p>If the current executor already has offsets assigned to all\n// position-dependent lexer actions, the method returns {@code this}.</p>\n//\n// @param offset The current offset to assign to all position-dependent\n// lexer actions which do not already have offsets assigned.\n//\n// @return A {@link LexerActionExecutor} which stores input stream offsets\n// for all position-dependent lexer actions.\n// /\nLexerActionExecutor.prototype.fixOffsetBeforeMatch = function(offset) {\n\tvar updatedLexerActions = null;\n\tfor (var i = 0; i < this.lexerActions.length; i++) {\n\t\tif (this.lexerActions[i].isPositionDependent &&\n\t\t\t\t!(this.lexerActions[i] instanceof LexerIndexedCustomAction)) {\n\t\t\tif (updatedLexerActions === null) {\n\t\t\t\tupdatedLexerActions = this.lexerActions.concat([]);\n\t\t\t}\n\t\t\tupdatedLexerActions[i] = new LexerIndexedCustomAction(offset,\n\t\t\t\t\tthis.lexerActions[i]);\n\t\t}\n\t}\n\tif (updatedLexerActions === null) {\n\t\treturn this;\n\t} else {\n\t\treturn new LexerActionExecutor(updatedLexerActions);\n\t}\n};\n\n// Execute the actions encapsulated by this executor within the context of a\n// particular {@link Lexer}.\n//\n// <p>This method calls {@link IntStream//seek} to set the position of the\n// {@code input} {@link CharStream} prior to calling\n// {@link LexerAction//execute} on a position-dependent action. Before the\n// method returns, the input position will be restored to the same position\n// it was in when the method was invoked.</p>\n//\n// @param lexer The lexer instance.\n// @param input The input stream which is the source for the current token.\n// When this method is called, the current {@link IntStream//index} for\n// {@code input} should be the start of the following token, i.e. 1\n// character past the end of the current token.\n// @param startIndex The token start index. This value may be passed to\n// {@link IntStream//seek} to set the {@code input} position to the beginning\n// of the token.\n// /\nLexerActionExecutor.prototype.execute = function(lexer, input, startIndex) {\n\tvar requiresSeek = false;\n\tvar stopIndex = input.index;\n\ttry {\n\t\tfor (var i = 0; i < this.lexerActions.length; i++) {\n\t\t\tvar lexerAction = this.lexerActions[i];\n\t\t\tif (lexerAction instanceof LexerIndexedCustomAction) {\n\t\t\t\tvar offset = lexerAction.offset;\n\t\t\t\tinput.seek(startIndex + offset);\n\t\t\t\tlexerAction = lexerAction.action;\n\t\t\t\trequiresSeek = (startIndex + offset) !== stopIndex;\n\t\t\t} else if (lexerAction.isPositionDependent) {\n\t\t\t\tinput.seek(stopIndex);\n\t\t\t\trequiresSeek = false;\n\t\t\t}\n\t\t\tlexerAction.execute(lexer);\n\t\t}\n\t} finally {\n\t\tif (requiresSeek) {\n\t\t\tinput.seek(stopIndex);\n\t\t}\n\t}\n};\n\nLexerActionExecutor.prototype.hashCode = function() {\n\treturn this.cachedHashCode;\n};\n\nLexerActionExecutor.prototype.updateHashCode = function(hash) {\n    hash.update(this.cachedHashCode);\n};\n\n\nLexerActionExecutor.prototype.equals = function(other) {\n\tif (this === other) {\n\t\treturn true;\n\t} else if (!(other instanceof LexerActionExecutor)) {\n\t\treturn false;\n\t} else if (this.cachedHashCode != other.cachedHashCode) {\n\t\treturn false;\n\t} else if (this.lexerActions.length != other.lexerActions.length) {\n\t\treturn false;\n\t} else {\n\t\tvar numActions = this.lexerActions.length\n\t\tfor (var idx = 0; idx < numActions; ++idx) {\n\t\t\tif (!this.lexerActions[idx].equals(other.lexerActions[idx])) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\t\treturn true;\n\t}\n};\n\nexports.LexerActionExecutor = LexerActionExecutor;\n","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n//\n\n//\n// The embodiment of the adaptive LL(*), ALL(*), parsing strategy.\n//\n// <p>\n// The basic complexity of the adaptive strategy makes it harder to understand.\n// We begin with ATN simulation to build paths in a DFA. Subsequent prediction\n// requests go through the DFA first. If they reach a state without an edge for\n// the current symbol, the algorithm fails over to the ATN simulation to\n// complete the DFA path for the current input (until it finds a conflict state\n// or uniquely predicting state).</p>\n//\n// <p>\n// All of that is done without using the outer context because we want to create\n// a DFA that is not dependent upon the rule invocation stack when we do a\n// prediction. One DFA works in all contexts. We avoid using context not\n// necessarily because it's slower, although it can be, but because of the DFA\n// caching problem. The closure routine only considers the rule invocation stack\n// created during prediction beginning in the decision rule. For example, if\n// prediction occurs without invoking another rule's ATN, there are no context\n// stacks in the configurations. When lack of context leads to a conflict, we\n// don't know if it's an ambiguity or a weakness in the strong LL(*) parsing\n// strategy (versus full LL(*)).</p>\n//\n// <p>\n// When SLL yields a configuration set with conflict, we rewind the input and\n// retry the ATN simulation, this time using full outer context without adding\n// to the DFA. Configuration context stacks will be the full invocation stacks\n// from the start rule. If we get a conflict using full context, then we can\n// definitively say we have a true ambiguity for that input sequence. If we\n// don't get a conflict, it implies that the decision is sensitive to the outer\n// context. (It is not context-sensitive in the sense of context-sensitive\n// grammars.)</p>\n//\n// <p>\n// The next time we reach this DFA state with an SLL conflict, through DFA\n// simulation, we will again retry the ATN simulation using full context mode.\n// This is slow because we can't save the results and have to \"interpret\" the\n// ATN each time we get that input.</p>\n//\n// <p>\n// <strong>CACHING FULL CONTEXT PREDICTIONS</strong></p>\n//\n// <p>\n// We could cache results from full context to predicted alternative easily and\n// that saves a lot of time but doesn't work in presence of predicates. The set\n// of visible predicates from the ATN start state changes depending on the\n// context, because closure can fall off the end of a rule. I tried to cache\n// tuples (stack context, semantic context, predicted alt) but it was slower\n// than interpreting and much more complicated. Also required a huge amount of\n// memory. The goal is not to create the world's fastest parser anyway. I'd like\n// to keep this algorithm simple. By launching multiple threads, we can improve\n// the speed of parsing across a large number of files.</p>\n//\n// <p>\n// There is no strict ordering between the amount of input used by SLL vs LL,\n// which makes it really hard to build a cache for full context. Let's say that\n// we have input A B C that leads to an SLL conflict with full context X. That\n// implies that using X we might only use A B but we could also use A B C D to\n// resolve conflict. Input A B C D could predict alternative 1 in one position\n// in the input and A B C E could predict alternative 2 in another position in\n// input. The conflicting SLL configurations could still be non-unique in the\n// full context prediction, which would lead us to requiring more input than the\n// original A B C.\tTo make a\tprediction cache work, we have to track\tthe exact\n// input\tused during the previous prediction. That amounts to a cache that maps\n// X to a specific DFA for that context.</p>\n//\n// <p>\n// Something should be done for left-recursive expression predictions. They are\n// likely LL(1) + pred eval. Easier to do the whole SLL unless error and retry\n// with full LL thing Sam does.</p>\n//\n// <p>\n// <strong>AVOIDING FULL CONTEXT PREDICTION</strong></p>\n//\n// <p>\n// We avoid doing full context retry when the outer context is empty, we did not\n// dip into the outer context by falling off the end of the decision state rule,\n// or when we force SLL mode.</p>\n//\n// <p>\n// As an example of the not dip into outer context case, consider as super\n// constructor calls versus function calls. One grammar might look like\n// this:</p>\n//\n// <pre>\n// ctorBody\n//   : '{' superCall? stat* '}'\n//   ;\n// </pre>\n//\n// <p>\n// Or, you might see something like</p>\n//\n// <pre>\n// stat\n//   : superCall ';'\n//   | expression ';'\n//   | ...\n//   ;\n// </pre>\n//\n// <p>\n// In both cases I believe that no closure operations will dip into the outer\n// context. In the first case ctorBody in the worst case will stop at the '}'.\n// In the 2nd case it should stop at the ';'. Both cases should stay within the\n// entry rule and not dip into the outer context.</p>\n//\n// <p>\n// <strong>PREDICATES</strong></p>\n//\n// <p>\n// Predicates are always evaluated if present in either SLL or LL both. SLL and\n// LL simulation deals with predicates differently. SLL collects predicates as\n// it performs closure operations like ANTLR v3 did. It delays predicate\n// evaluation until it reaches and accept state. This allows us to cache the SLL\n// ATN simulation whereas, if we had evaluated predicates on-the-fly during\n// closure, the DFA state configuration sets would be different and we couldn't\n// build up a suitable DFA.</p>\n//\n// <p>\n// When building a DFA accept state during ATN simulation, we evaluate any\n// predicates and return the sole semantically valid alternative. If there is\n// more than 1 alternative, we report an ambiguity. If there are 0 alternatives,\n// we throw an exception. Alternatives without predicates act like they have\n// true predicates. The simple way to think about it is to strip away all\n// alternatives with false predicates and choose the minimum alternative that\n// remains.</p>\n//\n// <p>\n// When we start in the DFA and reach an accept state that's predicated, we test\n// those and return the minimum semantically viable alternative. If no\n// alternatives are viable, we throw an exception.</p>\n//\n// <p>\n// During full LL ATN simulation, closure always evaluates predicates and\n// on-the-fly. This is crucial to reducing the configuration set size during\n// closure. It hits a landmine when parsing with the Java grammar, for example,\n// without this on-the-fly evaluation.</p>\n//\n// <p>\n// <strong>SHARING DFA</strong></p>\n//\n// <p>\n// All instances of the same parser share the same decision DFAs through a\n// static field. Each instance gets its own ATN simulator but they share the\n// same {@link //decisionToDFA} field. They also share a\n// {@link PredictionContextCache} object that makes sure that all\n// {@link PredictionContext} objects are shared among the DFA states. This makes\n// a big size difference.</p>\n//\n// <p>\n// <strong>THREAD SAFETY</strong></p>\n//\n// <p>\n// The {@link ParserATNSimulator} locks on the {@link //decisionToDFA} field when\n// it adds a new DFA object to that array. {@link //addDFAEdge}\n// locks on the DFA for the current decision when setting the\n// {@link DFAState//edges} field. {@link //addDFAState} locks on\n// the DFA for the current decision when looking up a DFA state to see if it\n// already exists. We must make sure that all requests to add DFA states that\n// are equivalent result in the same shared DFA object. This is because lots of\n// threads will be trying to update the DFA at once. The\n// {@link //addDFAState} method also locks inside the DFA lock\n// but this time on the shared context cache when it rebuilds the\n// configurations' {@link PredictionContext} objects using cached\n// subgraphs/nodes. No other locking occurs, even during DFA simulation. This is\n// safe as long as we can guarantee that all threads referencing\n// {@code s.edge[t]} get the same physical target {@link DFAState}, or\n// {@code null}. Once into the DFA, the DFA simulation does not reference the\n// {@link DFA//states} map. It follows the {@link DFAState//edges} field to new\n// targets. The DFA simulator will either find {@link DFAState//edges} to be\n// {@code null}, to be non-{@code null} and {@code dfa.edges[t]} null, or\n// {@code dfa.edges[t]} to be non-null. The\n// {@link //addDFAEdge} method could be racing to set the field\n// but in either case the DFA simulator works; if {@code null}, and requests ATN\n// simulation. It could also race trying to get {@code dfa.edges[t]}, but either\n// way it will work because it's not doing a test and set operation.</p>\n//\n// <p>\n// <strong>Starting with SLL then failing to combined SLL/LL (Two-Stage\n// Parsing)</strong></p>\n//\n// <p>\n// Sam pointed out that if SLL does not give a syntax error, then there is no\n// point in doing full LL, which is slower. We only have to try LL if we get a\n// syntax error. For maximum speed, Sam starts the parser set to pure SLL\n// mode with the {@link BailErrorStrategy}:</p>\n//\n// <pre>\n// parser.{@link Parser//getInterpreter() getInterpreter()}.{@link //setPredictionMode setPredictionMode}{@code (}{@link PredictionMode//SLL}{@code )};\n// parser.{@link Parser//setErrorHandler setErrorHandler}(new {@link BailErrorStrategy}());\n// </pre>\n//\n// <p>\n// If it does not get a syntax error, then we're done. If it does get a syntax\n// error, we need to retry with the combined SLL/LL strategy.</p>\n//\n// <p>\n// The reason this works is as follows. If there are no SLL conflicts, then the\n// grammar is SLL (at least for that input set). If there is an SLL conflict,\n// the full LL analysis must yield a set of viable alternatives which is a\n// subset of the alternatives reported by SLL. If the LL set is a singleton,\n// then the grammar is LL but not SLL. If the LL set is the same size as the SLL\n// set, the decision is SLL. If the LL set has size &gt; 1, then that decision\n// is truly ambiguous on the current input. If the LL set is smaller, then the\n// SLL conflict resolution might choose an alternative that the full LL would\n// rule out as a possibility based upon better context information. If that's\n// the case, then the SLL parse will definitely get an error because the full LL\n// analysis says it's not viable. If SLL conflict resolution chooses an\n// alternative within the LL set, them both SLL and LL would choose the same\n// alternative because they both choose the minimum of multiple conflicting\n// alternatives.</p>\n//\n// <p>\n// Let's say we have a set of SLL conflicting alternatives {@code {1, 2, 3}} and\n// a smaller LL set called <em>s</em>. If <em>s</em> is {@code {2, 3}}, then SLL\n// parsing will get an error because SLL will pursue alternative 1. If\n// <em>s</em> is {@code {1, 2}} or {@code {1, 3}} then both SLL and LL will\n// choose the same alternative because alternative one is the minimum of either\n// set. If <em>s</em> is {@code {2}} or {@code {3}} then SLL will get a syntax\n// error. If <em>s</em> is {@code {1}} then SLL will succeed.</p>\n//\n// <p>\n// Of course, if the input is invalid, then we will get an error for sure in\n// both SLL and LL parsing. Erroneous input will therefore require 2 passes over\n// the input.</p>\n//\n\nvar Utils = require('./../Utils');\nvar Set = Utils.Set;\nvar BitSet = Utils.BitSet;\nvar DoubleDict = Utils.DoubleDict;\nvar ATN = require('./ATN').ATN;\nvar ATNState = require('./ATNState').ATNState;\nvar ATNConfig = require('./ATNConfig').ATNConfig;\nvar ATNConfigSet = require('./ATNConfigSet').ATNConfigSet;\nvar Token = require('./../Token').Token;\nvar DFAState = require('./../dfa/DFAState').DFAState;\nvar PredPrediction = require('./../dfa/DFAState').PredPrediction;\nvar ATNSimulator = require('./ATNSimulator').ATNSimulator;\nvar PredictionMode = require('./PredictionMode').PredictionMode;\nvar RuleContext = require('./../RuleContext').RuleContext;\nvar ParserRuleContext = require('./../ParserRuleContext').ParserRuleContext;\nvar SemanticContext = require('./SemanticContext').SemanticContext;\nvar StarLoopEntryState = require('./ATNState').StarLoopEntryState;\nvar RuleStopState = require('./ATNState').RuleStopState;\nvar PredictionContext = require('./../PredictionContext').PredictionContext;\nvar Interval = require('./../IntervalSet').Interval;\nvar Transitions = require('./Transition');\nvar Transition = Transitions.Transition;\nvar SetTransition = Transitions.SetTransition;\nvar NotSetTransition = Transitions.NotSetTransition;\nvar RuleTransition = Transitions.RuleTransition;\nvar ActionTransition = Transitions.ActionTransition;\nvar NoViableAltException = require('./../error/Errors').NoViableAltException;\n\nvar SingletonPredictionContext = require('./../PredictionContext').SingletonPredictionContext;\nvar predictionContextFromRuleContext = require('./../PredictionContext').predictionContextFromRuleContext;\n\nfunction ParserATNSimulator(parser, atn, decisionToDFA, sharedContextCache) {\n\tATNSimulator.call(this, atn, sharedContextCache);\n    this.parser = parser;\n    this.decisionToDFA = decisionToDFA;\n    // SLL, LL, or LL + exact ambig detection?//\n    this.predictionMode = PredictionMode.LL;\n    // LAME globals to avoid parameters!!!!! I need these down deep in predTransition\n    this._input = null;\n    this._startIndex = 0;\n    this._outerContext = null;\n    this._dfa = null;\n    // Each prediction operation uses a cache for merge of prediction contexts.\n    //  Don't keep around as it wastes huge amounts of memory. DoubleKeyMap\n    //  isn't synchronized but we're ok since two threads shouldn't reuse same\n    //  parser/atnsim object because it can only handle one input at a time.\n    //  This maps graphs a and b to merged result c. (a,b)&rarr;c. We can avoid\n    //  the merge if we ever see a and b again.  Note that (b,a)&rarr;c should\n    //  also be examined during cache lookup.\n    //\n    this.mergeCache = null;\n    return this;\n}\n\nParserATNSimulator.prototype = Object.create(ATNSimulator.prototype);\nParserATNSimulator.prototype.constructor = ParserATNSimulator;\n\nParserATNSimulator.prototype.debug = false;\nParserATNSimulator.prototype.debug_closure = false;\nParserATNSimulator.prototype.debug_add = false;\nParserATNSimulator.prototype.debug_list_atn_decisions = false;\nParserATNSimulator.prototype.dfa_debug = false;\nParserATNSimulator.prototype.retry_debug = false;\n\n\nParserATNSimulator.prototype.reset = function() {\n};\n\nParserATNSimulator.prototype.adaptivePredict = function(input, decision, outerContext) {\n    if (this.debug || this.debug_list_atn_decisions) {\n        console.log(\"adaptivePredict decision \" + decision +\n                               \" exec LA(1)==\" + this.getLookaheadName(input) +\n                               \" line \" + input.LT(1).line + \":\" +\n                               input.LT(1).column);\n    }\n    this._input = input;\n    this._startIndex = input.index;\n    this._outerContext = outerContext;\n\n    var dfa = this.decisionToDFA[decision];\n    this._dfa = dfa;\n    var m = input.mark();\n    var index = input.index;\n\n    // Now we are certain to have a specific decision's DFA\n    // But, do we still need an initial state?\n    try {\n        var s0;\n        if (dfa.precedenceDfa) {\n            // the start state for a precedence DFA depends on the current\n            // parser precedence, and is provided by a DFA method.\n            s0 = dfa.getPrecedenceStartState(this.parser.getPrecedence());\n        } else {\n            // the start state for a \"regular\" DFA is just s0\n            s0 = dfa.s0;\n        }\n        if (s0===null) {\n            if (outerContext===null) {\n                outerContext = RuleContext.EMPTY;\n            }\n            if (this.debug || this.debug_list_atn_decisions) {\n                console.log(\"predictATN decision \" + dfa.decision +\n                                   \" exec LA(1)==\" + this.getLookaheadName(input) +\n                                   \", outerContext=\" + outerContext.toString(this.parser.ruleNames));\n            }\n\n            var fullCtx = false;\n            var s0_closure = this.computeStartState(dfa.atnStartState, RuleContext.EMPTY, fullCtx);\n\n            if( dfa.precedenceDfa) {\n                // If this is a precedence DFA, we use applyPrecedenceFilter\n                // to convert the computed start state to a precedence start\n                // state. We then use DFA.setPrecedenceStartState to set the\n                // appropriate start state for the precedence level rather\n                // than simply setting DFA.s0.\n                //\n                dfa.s0.configs = s0_closure; // not used for prediction but useful to know start configs anyway\n                s0_closure = this.applyPrecedenceFilter(s0_closure);\n                s0 = this.addDFAState(dfa, new DFAState(null, s0_closure));\n                dfa.setPrecedenceStartState(this.parser.getPrecedence(), s0);\n            } else {\n                s0 = this.addDFAState(dfa, new DFAState(null, s0_closure));\n                dfa.s0 = s0;\n            }\n        }\n        var alt = this.execATN(dfa, s0, input, index, outerContext);\n        if (this.debug) {\n            console.log(\"DFA after predictATN: \" + dfa.toString(this.parser.literalNames));\n        }\n        return alt;\n    } finally {\n        this._dfa = null;\n        this.mergeCache = null; // wack cache after each prediction\n        input.seek(index);\n        input.release(m);\n    }\n};\n// Performs ATN simulation to compute a predicted alternative based\n//  upon the remaining input, but also updates the DFA cache to avoid\n//  having to traverse the ATN again for the same input sequence.\n\n// There are some key conditions we're looking for after computing a new\n// set of ATN configs (proposed DFA state):\n      // if the set is empty, there is no viable alternative for current symbol\n      // does the state uniquely predict an alternative?\n      // does the state have a conflict that would prevent us from\n      //   putting it on the work list?\n\n// We also have some key operations to do:\n      // add an edge from previous DFA state to potentially new DFA state, D,\n      //   upon current symbol but only if adding to work list, which means in all\n      //   cases except no viable alternative (and possibly non-greedy decisions?)\n      // collecting predicates and adding semantic context to DFA accept states\n      // adding rule context to context-sensitive DFA accept states\n      // consuming an input symbol\n      // reporting a conflict\n      // reporting an ambiguity\n      // reporting a context sensitivity\n      // reporting insufficient predicates\n\n// cover these cases:\n//    dead end\n//    single alt\n//    single alt + preds\n//    conflict\n//    conflict + preds\n//\nParserATNSimulator.prototype.execATN = function(dfa, s0, input, startIndex, outerContext ) {\n    if (this.debug || this.debug_list_atn_decisions) {\n        console.log(\"execATN decision \" + dfa.decision +\n                \" exec LA(1)==\" + this.getLookaheadName(input) +\n                \" line \" + input.LT(1).line + \":\" + input.LT(1).column);\n    }\n    var alt;\n    var previousD = s0;\n\n    if (this.debug) {\n        console.log(\"s0 = \" + s0);\n    }\n    var t = input.LA(1);\n    while(true) { // while more work\n        var D = this.getExistingTargetState(previousD, t);\n        if(D===null) {\n            D = this.computeTargetState(dfa, previousD, t);\n        }\n        if(D===ATNSimulator.ERROR) {\n            // if any configs in previous dipped into outer context, that\n            // means that input up to t actually finished entry rule\n            // at least for SLL decision. Full LL doesn't dip into outer\n            // so don't need special case.\n            // We will get an error no matter what so delay until after\n            // decision; better error message. Also, no reachable target\n            // ATN states in SLL implies LL will also get nowhere.\n            // If conflict in states that dip out, choose min since we\n            // will get error no matter what.\n            var e = this.noViableAlt(input, outerContext, previousD.configs, startIndex);\n            input.seek(startIndex);\n            alt = this.getSynValidOrSemInvalidAltThatFinishedDecisionEntryRule(previousD.configs, outerContext);\n            if(alt!==ATN.INVALID_ALT_NUMBER) {\n                return alt;\n            } else {\n                throw e;\n            }\n        }\n        if(D.requiresFullContext && this.predictionMode !== PredictionMode.SLL) {\n            // IF PREDS, MIGHT RESOLVE TO SINGLE ALT => SLL (or syntax error)\n            var conflictingAlts = null;\n            if (D.predicates!==null) {\n                if (this.debug) {\n                    console.log(\"DFA state has preds in DFA sim LL failover\");\n                }\n                var conflictIndex = input.index;\n                if(conflictIndex !== startIndex) {\n                    input.seek(startIndex);\n                }\n                conflictingAlts = this.evalSemanticContext(D.predicates, outerContext, true);\n                if (conflictingAlts.length===1) {\n                    if(this.debug) {\n                        console.log(\"Full LL avoided\");\n                    }\n                    return conflictingAlts.minValue();\n                }\n                if (conflictIndex !== startIndex) {\n                    // restore the index so reporting the fallback to full\n                    // context occurs with the index at the correct spot\n                    input.seek(conflictIndex);\n                }\n            }\n            if (this.dfa_debug) {\n                console.log(\"ctx sensitive state \" + outerContext +\" in \" + D);\n            }\n            var fullCtx = true;\n            var s0_closure = this.computeStartState(dfa.atnStartState, outerContext, fullCtx);\n            this.reportAttemptingFullContext(dfa, conflictingAlts, D.configs, startIndex, input.index);\n            alt = this.execATNWithFullContext(dfa, D, s0_closure, input, startIndex, outerContext);\n            return alt;\n        }\n        if (D.isAcceptState) {\n            if (D.predicates===null) {\n                return D.prediction;\n            }\n            var stopIndex = input.index;\n            input.seek(startIndex);\n            var alts = this.evalSemanticContext(D.predicates, outerContext, true);\n            if (alts.length===0) {\n                throw this.noViableAlt(input, outerContext, D.configs, startIndex);\n            } else if (alts.length===1) {\n                return alts.minValue();\n            } else {\n                // report ambiguity after predicate evaluation to make sure the correct set of ambig alts is reported.\n                this.reportAmbiguity(dfa, D, startIndex, stopIndex, false, alts, D.configs);\n                return alts.minValue();\n            }\n        }\n        previousD = D;\n\n        if (t !== Token.EOF) {\n            input.consume();\n            t = input.LA(1);\n        }\n    }\n};\n//\n// Get an existing target state for an edge in the DFA. If the target state\n// for the edge has not yet been computed or is otherwise not available,\n// this method returns {@code null}.\n//\n// @param previousD The current DFA state\n// @param t The next input symbol\n// @return The existing target DFA state for the given input symbol\n// {@code t}, or {@code null} if the target state for this edge is not\n// already cached\n//\nParserATNSimulator.prototype.getExistingTargetState = function(previousD, t) {\n    var edges = previousD.edges;\n    if (edges===null) {\n        return null;\n    } else {\n        return edges[t + 1] || null;\n    }\n};\n//\n// Compute a target state for an edge in the DFA, and attempt to add the\n// computed state and corresponding edge to the DFA.\n//\n// @param dfa The DFA\n// @param previousD The current DFA state\n// @param t The next input symbol\n//\n// @return The computed target DFA state for the given input symbol\n// {@code t}. If {@code t} does not lead to a valid DFA state, this method\n// returns {@link //ERROR}.\n//\nParserATNSimulator.prototype.computeTargetState = function(dfa, previousD, t) {\n   var reach = this.computeReachSet(previousD.configs, t, false);\n    if(reach===null) {\n        this.addDFAEdge(dfa, previousD, t, ATNSimulator.ERROR);\n        return ATNSimulator.ERROR;\n    }\n    // create new target state; we'll add to DFA after it's complete\n    var D = new DFAState(null, reach);\n\n    var predictedAlt = this.getUniqueAlt(reach);\n\n    if (this.debug) {\n        var altSubSets = PredictionMode.getConflictingAltSubsets(reach);\n        console.log(\"SLL altSubSets=\" + Utils.arrayToString(altSubSets) +\n                    \", previous=\" + previousD.configs +\n                    \", configs=\" + reach +\n                    \", predict=\" + predictedAlt +\n                    \", allSubsetsConflict=\" +\n                    PredictionMode.allSubsetsConflict(altSubSets) + \", conflictingAlts=\" +\n                    this.getConflictingAlts(reach));\n    }\n    if (predictedAlt!==ATN.INVALID_ALT_NUMBER) {\n        // NO CONFLICT, UNIQUELY PREDICTED ALT\n        D.isAcceptState = true;\n        D.configs.uniqueAlt = predictedAlt;\n        D.prediction = predictedAlt;\n    } else if (PredictionMode.hasSLLConflictTerminatingPrediction(this.predictionMode, reach)) {\n        // MORE THAN ONE VIABLE ALTERNATIVE\n        D.configs.conflictingAlts = this.getConflictingAlts(reach);\n        D.requiresFullContext = true;\n        // in SLL-only mode, we will stop at this state and return the minimum alt\n        D.isAcceptState = true;\n        D.prediction = D.configs.conflictingAlts.minValue();\n    }\n    if (D.isAcceptState && D.configs.hasSemanticContext) {\n        this.predicateDFAState(D, this.atn.getDecisionState(dfa.decision));\n        if( D.predicates!==null) {\n            D.prediction = ATN.INVALID_ALT_NUMBER;\n        }\n    }\n    // all adds to dfa are done after we've created full D state\n    D = this.addDFAEdge(dfa, previousD, t, D);\n    return D;\n};\n\nParserATNSimulator.prototype.predicateDFAState = function(dfaState, decisionState) {\n    // We need to test all predicates, even in DFA states that\n    // uniquely predict alternative.\n    var nalts = decisionState.transitions.length;\n    // Update DFA so reach becomes accept state with (predicate,alt)\n    // pairs if preds found for conflicting alts\n    var altsToCollectPredsFrom = this.getConflictingAltsOrUniqueAlt(dfaState.configs);\n    var altToPred = this.getPredsForAmbigAlts(altsToCollectPredsFrom, dfaState.configs, nalts);\n    if (altToPred!==null) {\n        dfaState.predicates = this.getPredicatePredictions(altsToCollectPredsFrom, altToPred);\n        dfaState.prediction = ATN.INVALID_ALT_NUMBER; // make sure we use preds\n    } else {\n        // There are preds in configs but they might go away\n        // when OR'd together like {p}? || NONE == NONE. If neither\n        // alt has preds, resolve to min alt\n        dfaState.prediction = altsToCollectPredsFrom.minValue();\n    }\n};\n\n// comes back with reach.uniqueAlt set to a valid alt\nParserATNSimulator.prototype.execATNWithFullContext = function(dfa, D, // how far we got before failing over\n                                     s0,\n                                     input,\n                                     startIndex,\n                                     outerContext) {\n    if (this.debug || this.debug_list_atn_decisions) {\n        console.log(\"execATNWithFullContext \"+s0);\n    }\n    var fullCtx = true;\n    var foundExactAmbig = false;\n    var reach = null;\n    var previous = s0;\n    input.seek(startIndex);\n    var t = input.LA(1);\n    var predictedAlt = -1;\n    while (true) { // while more work\n        reach = this.computeReachSet(previous, t, fullCtx);\n        if (reach===null) {\n            // if any configs in previous dipped into outer context, that\n            // means that input up to t actually finished entry rule\n            // at least for LL decision. Full LL doesn't dip into outer\n            // so don't need special case.\n            // We will get an error no matter what so delay until after\n            // decision; better error message. Also, no reachable target\n            // ATN states in SLL implies LL will also get nowhere.\n            // If conflict in states that dip out, choose min since we\n            // will get error no matter what.\n            var e = this.noViableAlt(input, outerContext, previous, startIndex);\n            input.seek(startIndex);\n            var alt = this.getSynValidOrSemInvalidAltThatFinishedDecisionEntryRule(previous, outerContext);\n            if(alt!==ATN.INVALID_ALT_NUMBER) {\n                return alt;\n            } else {\n                throw e;\n            }\n        }\n        var altSubSets = PredictionMode.getConflictingAltSubsets(reach);\n        if(this.debug) {\n            console.log(\"LL altSubSets=\" + altSubSets + \", predict=\" +\n                  PredictionMode.getUniqueAlt(altSubSets) + \", resolvesToJustOneViableAlt=\" +\n                  PredictionMode.resolvesToJustOneViableAlt(altSubSets));\n        }\n        reach.uniqueAlt = this.getUniqueAlt(reach);\n        // unique prediction?\n        if(reach.uniqueAlt!==ATN.INVALID_ALT_NUMBER) {\n            predictedAlt = reach.uniqueAlt;\n            break;\n        } else if (this.predictionMode !== PredictionMode.LL_EXACT_AMBIG_DETECTION) {\n            predictedAlt = PredictionMode.resolvesToJustOneViableAlt(altSubSets);\n            if(predictedAlt !== ATN.INVALID_ALT_NUMBER) {\n                break;\n            }\n        } else {\n            // In exact ambiguity mode, we never try to terminate early.\n            // Just keeps scarfing until we know what the conflict is\n            if (PredictionMode.allSubsetsConflict(altSubSets) && PredictionMode.allSubsetsEqual(altSubSets)) {\n                foundExactAmbig = true;\n                predictedAlt = PredictionMode.getSingleViableAlt(altSubSets);\n                break;\n            }\n            // else there are multiple non-conflicting subsets or\n            // we're not sure what the ambiguity is yet.\n            // So, keep going.\n        }\n        previous = reach;\n        if( t !== Token.EOF) {\n            input.consume();\n            t = input.LA(1);\n        }\n    }\n    // If the configuration set uniquely predicts an alternative,\n    // without conflict, then we know that it's a full LL decision\n    // not SLL.\n    if (reach.uniqueAlt !== ATN.INVALID_ALT_NUMBER ) {\n        this.reportContextSensitivity(dfa, predictedAlt, reach, startIndex, input.index);\n        return predictedAlt;\n    }\n    // We do not check predicates here because we have checked them\n    // on-the-fly when doing full context prediction.\n\n    //\n    // In non-exact ambiguity detection mode, we might\tactually be able to\n    // detect an exact ambiguity, but I'm not going to spend the cycles\n    // needed to check. We only emit ambiguity warnings in exact ambiguity\n    // mode.\n    //\n    // For example, we might know that we have conflicting configurations.\n    // But, that does not mean that there is no way forward without a\n    // conflict. It's possible to have nonconflicting alt subsets as in:\n\n    // altSubSets=[{1, 2}, {1, 2}, {1}, {1, 2}]\n\n    // from\n    //\n    //    [(17,1,[5 $]), (13,1,[5 10 $]), (21,1,[5 10 $]), (11,1,[$]),\n    //     (13,2,[5 10 $]), (21,2,[5 10 $]), (11,2,[$])]\n    //\n    // In this case, (17,1,[5 $]) indicates there is some next sequence that\n    // would resolve this without conflict to alternative 1. Any other viable\n    // next sequence, however, is associated with a conflict.  We stop\n    // looking for input because no amount of further lookahead will alter\n    // the fact that we should predict alternative 1.  We just can't say for\n    // sure that there is an ambiguity without looking further.\n\n    this.reportAmbiguity(dfa, D, startIndex, input.index, foundExactAmbig, null, reach);\n\n    return predictedAlt;\n};\n\nParserATNSimulator.prototype.computeReachSet = function(closure, t, fullCtx) {\n    if (this.debug) {\n        console.log(\"in computeReachSet, starting closure: \" + closure);\n    }\n    if( this.mergeCache===null) {\n        this.mergeCache = new DoubleDict();\n    }\n    var intermediate = new ATNConfigSet(fullCtx);\n\n    // Configurations already in a rule stop state indicate reaching the end\n    // of the decision rule (local context) or end of the start rule (full\n    // context). Once reached, these configurations are never updated by a\n    // closure operation, so they are handled separately for the performance\n    // advantage of having a smaller intermediate set when calling closure.\n    //\n    // For full-context reach operations, separate handling is required to\n    // ensure that the alternative matching the longest overall sequence is\n    // chosen when multiple such configurations can match the input.\n\n    var skippedStopStates = null;\n\n    // First figure out where we can reach on input t\n    for (var i=0; i<closure.items.length;i++) {\n        var c = closure.items[i];\n        if(this.debug_add) {\n            console.log(\"testing \" + this.getTokenName(t) + \" at \" + c);\n        }\n        if (c.state instanceof RuleStopState) {\n            if (fullCtx || t === Token.EOF) {\n                if (skippedStopStates===null) {\n                    skippedStopStates = [];\n                }\n                skippedStopStates.push(c);\n                if(this.debug_add) {\n                    console.log(\"added \" + c + \" to skippedStopStates\");\n                }\n            }\n            continue;\n        }\n        for(var j=0;j<c.state.transitions.length;j++) {\n            var trans = c.state.transitions[j];\n            var target = this.getReachableTarget(trans, t);\n            if (target!==null) {\n                var cfg = new ATNConfig({state:target}, c);\n                intermediate.add(cfg, this.mergeCache);\n                if(this.debug_add) {\n                    console.log(\"added \" + cfg + \" to intermediate\");\n                }\n            }\n        }\n    }\n    // Now figure out where the reach operation can take us...\n    var reach = null;\n\n    // This block optimizes the reach operation for intermediate sets which\n    // trivially indicate a termination state for the overall\n    // adaptivePredict operation.\n    //\n    // The conditions assume that intermediate\n    // contains all configurations relevant to the reach set, but this\n    // condition is not true when one or more configurations have been\n    // withheld in skippedStopStates, or when the current symbol is EOF.\n    //\n    if (skippedStopStates===null && t!==Token.EOF) {\n        if (intermediate.items.length===1) {\n            // Don't pursue the closure if there is just one state.\n            // It can only have one alternative; just add to result\n            // Also don't pursue the closure if there is unique alternative\n            // among the configurations.\n            reach = intermediate;\n        } else if (this.getUniqueAlt(intermediate)!==ATN.INVALID_ALT_NUMBER) {\n            // Also don't pursue the closure if there is unique alternative\n            // among the configurations.\n            reach = intermediate;\n        }\n    }\n    // If the reach set could not be trivially determined, perform a closure\n    // operation on the intermediate set to compute its initial value.\n    //\n    if (reach===null) {\n        reach = new ATNConfigSet(fullCtx);\n        var closureBusy = new Set();\n        var treatEofAsEpsilon = t === Token.EOF;\n        for (var k=0; k<intermediate.items.length;k++) {\n            this.closure(intermediate.items[k], reach, closureBusy, false, fullCtx, treatEofAsEpsilon);\n        }\n    }\n    if (t === Token.EOF) {\n        // After consuming EOF no additional input is possible, so we are\n        // only interested in configurations which reached the end of the\n        // decision rule (local context) or end of the start rule (full\n        // context). Update reach to contain only these configurations. This\n        // handles both explicit EOF transitions in the grammar and implicit\n        // EOF transitions following the end of the decision or start rule.\n        //\n        // When reach==intermediate, no closure operation was performed. In\n        // this case, removeAllConfigsNotInRuleStopState needs to check for\n        // reachable rule stop states as well as configurations already in\n        // a rule stop state.\n        //\n        // This is handled before the configurations in skippedStopStates,\n        // because any configurations potentially added from that list are\n        // already guaranteed to meet this condition whether or not it's\n        // required.\n        //\n        reach = this.removeAllConfigsNotInRuleStopState(reach, reach === intermediate);\n    }\n    // If skippedStopStates!==null, then it contains at least one\n    // configuration. For full-context reach operations, these\n    // configurations reached the end of the start rule, in which case we\n    // only add them back to reach if no configuration during the current\n    // closure operation reached such a state. This ensures adaptivePredict\n    // chooses an alternative matching the longest overall sequence when\n    // multiple alternatives are viable.\n    //\n    if (skippedStopStates!==null && ( (! fullCtx) || (! PredictionMode.hasConfigInRuleStopState(reach)))) {\n        for (var l=0; l<skippedStopStates.length;l++) {\n            reach.add(skippedStopStates[l], this.mergeCache);\n        }\n    }\n    if (reach.items.length===0) {\n        return null;\n    } else {\n        return reach;\n    }\n};\n//\n// Return a configuration set containing only the configurations from\n// {@code configs} which are in a {@link RuleStopState}. If all\n// configurations in {@code configs} are already in a rule stop state, this\n// method simply returns {@code configs}.\n//\n// <p>When {@code lookToEndOfRule} is true, this method uses\n// {@link ATN//nextTokens} for each configuration in {@code configs} which is\n// not already in a rule stop state to see if a rule stop state is reachable\n// from the configuration via epsilon-only transitions.</p>\n//\n// @param configs the configuration set to update\n// @param lookToEndOfRule when true, this method checks for rule stop states\n// reachable by epsilon-only transitions from each configuration in\n// {@code configs}.\n//\n// @return {@code configs} if all configurations in {@code configs} are in a\n// rule stop state, otherwise return a new configuration set containing only\n// the configurations from {@code configs} which are in a rule stop state\n//\nParserATNSimulator.prototype.removeAllConfigsNotInRuleStopState = function(configs, lookToEndOfRule) {\n    if (PredictionMode.allConfigsInRuleStopStates(configs)) {\n        return configs;\n    }\n    var result = new ATNConfigSet(configs.fullCtx);\n    for(var i=0; i<configs.items.length;i++) {\n        var config = configs.items[i];\n        if (config.state instanceof RuleStopState) {\n            result.add(config, this.mergeCache);\n            continue;\n        }\n        if (lookToEndOfRule && config.state.epsilonOnlyTransitions) {\n            var nextTokens = this.atn.nextTokens(config.state);\n            if (nextTokens.contains(Token.EPSILON)) {\n                var endOfRuleState = this.atn.ruleToStopState[config.state.ruleIndex];\n                result.add(new ATNConfig({state:endOfRuleState}, config), this.mergeCache);\n            }\n        }\n    }\n    return result;\n};\n\nParserATNSimulator.prototype.computeStartState = function(p, ctx, fullCtx) {\n    // always at least the implicit call to start rule\n    var initialContext = predictionContextFromRuleContext(this.atn, ctx);\n    var configs = new ATNConfigSet(fullCtx);\n    for(var i=0;i<p.transitions.length;i++) {\n        var target = p.transitions[i].target;\n        var c = new ATNConfig({ state:target, alt:i+1, context:initialContext }, null);\n        var closureBusy = new Set();\n        this.closure(c, configs, closureBusy, true, fullCtx, false);\n    }\n    return configs;\n};\n\n//\n// This method transforms the start state computed by\n// {@link //computeStartState} to the special start state used by a\n// precedence DFA for a particular precedence value. The transformation\n// process applies the following changes to the start state's configuration\n// set.\n//\n// <ol>\n// <li>Evaluate the precedence predicates for each configuration using\n// {@link SemanticContext//evalPrecedence}.</li>\n// <li>Remove all configurations which predict an alternative greater than\n// 1, for which another configuration that predicts alternative 1 is in the\n// same ATN state with the same prediction context. This transformation is\n// valid for the following reasons:\n// <ul>\n// <li>The closure block cannot contain any epsilon transitions which bypass\n// the body of the closure, so all states reachable via alternative 1 are\n// part of the precedence alternatives of the transformed left-recursive\n// rule.</li>\n// <li>The \"primary\" portion of a left recursive rule cannot contain an\n// epsilon transition, so the only way an alternative other than 1 can exist\n// in a state that is also reachable via alternative 1 is by nesting calls\n// to the left-recursive rule, with the outer calls not being at the\n// preferred precedence level.</li>\n// </ul>\n// </li>\n// </ol>\n//\n// <p>\n// The prediction context must be considered by this filter to address\n// situations like the following.\n// </p>\n// <code>\n// <pre>\n// grammar TA;\n// prog: statement* EOF;\n// statement: letterA | statement letterA 'b' ;\n// letterA: 'a';\n// </pre>\n// </code>\n// <p>\n// If the above grammar, the ATN state immediately before the token\n// reference {@code 'a'} in {@code letterA} is reachable from the left edge\n// of both the primary and closure blocks of the left-recursive rule\n// {@code statement}. The prediction context associated with each of these\n// configurations distinguishes between them, and prevents the alternative\n// which stepped out to {@code prog} (and then back in to {@code statement}\n// from being eliminated by the filter.\n// </p>\n//\n// @param configs The configuration set computed by\n// {@link //computeStartState} as the start state for the DFA.\n// @return The transformed configuration set representing the start state\n// for a precedence DFA at a particular precedence level (determined by\n// calling {@link Parser//getPrecedence}).\n//\nParserATNSimulator.prototype.applyPrecedenceFilter = function(configs) {\n\tvar config;\n\tvar statesFromAlt1 = [];\n    var configSet = new ATNConfigSet(configs.fullCtx);\n    for(var i=0; i<configs.items.length; i++) {\n        config = configs.items[i];\n        // handle alt 1 first\n        if (config.alt !== 1) {\n            continue;\n        }\n        var updatedContext = config.semanticContext.evalPrecedence(this.parser, this._outerContext);\n        if (updatedContext===null) {\n            // the configuration was eliminated\n            continue;\n        }\n        statesFromAlt1[config.state.stateNumber] = config.context;\n        if (updatedContext !== config.semanticContext) {\n            configSet.add(new ATNConfig({semanticContext:updatedContext}, config), this.mergeCache);\n        } else {\n            configSet.add(config, this.mergeCache);\n        }\n    }\n    for(i=0; i<configs.items.length; i++) {\n        config = configs.items[i];\n        if (config.alt === 1) {\n            // already handled\n            continue;\n        }\n        // In the future, this elimination step could be updated to also\n        // filter the prediction context for alternatives predicting alt>1\n        // (basically a graph subtraction algorithm).\n\t\tif (!config.precedenceFilterSuppressed) {\n            var context = statesFromAlt1[config.state.stateNumber] || null;\n            if (context!==null && context.equals(config.context)) {\n                // eliminated\n                continue;\n            }\n\t\t}\n        configSet.add(config, this.mergeCache);\n    }\n    return configSet;\n};\n\nParserATNSimulator.prototype.getReachableTarget = function(trans, ttype) {\n    if (trans.matches(ttype, 0, this.atn.maxTokenType)) {\n        return trans.target;\n    } else {\n        return null;\n    }\n};\n\nParserATNSimulator.prototype.getPredsForAmbigAlts = function(ambigAlts, configs, nalts) {\n    // REACH=[1|1|[]|0:0, 1|2|[]|0:1]\n    // altToPred starts as an array of all null contexts. The entry at index i\n    // corresponds to alternative i. altToPred[i] may have one of three values:\n    //   1. null: no ATNConfig c is found such that c.alt==i\n    //   2. SemanticContext.NONE: At least one ATNConfig c exists such that\n    //      c.alt==i and c.semanticContext==SemanticContext.NONE. In other words,\n    //      alt i has at least one unpredicated config.\n    //   3. Non-NONE Semantic Context: There exists at least one, and for all\n    //      ATNConfig c such that c.alt==i, c.semanticContext!=SemanticContext.NONE.\n    //\n    // From this, it is clear that NONE||anything==NONE.\n    //\n    var altToPred = [];\n    for(var i=0;i<configs.items.length;i++) {\n        var c = configs.items[i];\n        if(ambigAlts.contains( c.alt )) {\n            altToPred[c.alt] = SemanticContext.orContext(altToPred[c.alt] || null, c.semanticContext);\n        }\n    }\n    var nPredAlts = 0;\n    for (i =1;i< nalts+1;i++) {\n        var pred = altToPred[i] || null;\n        if (pred===null) {\n            altToPred[i] = SemanticContext.NONE;\n        } else if (pred !== SemanticContext.NONE) {\n            nPredAlts += 1;\n        }\n    }\n    // nonambig alts are null in altToPred\n    if (nPredAlts===0) {\n        altToPred = null;\n    }\n    if (this.debug) {\n        console.log(\"getPredsForAmbigAlts result \" + Utils.arrayToString(altToPred));\n    }\n    return altToPred;\n};\n\nParserATNSimulator.prototype.getPredicatePredictions = function(ambigAlts, altToPred) {\n    var pairs = [];\n    var containsPredicate = false;\n    for (var i=1; i<altToPred.length;i++) {\n        var pred = altToPred[i];\n        // unpredicated is indicated by SemanticContext.NONE\n        if( ambigAlts!==null && ambigAlts.contains( i )) {\n            pairs.push(new PredPrediction(pred, i));\n        }\n        if (pred !== SemanticContext.NONE) {\n            containsPredicate = true;\n        }\n    }\n    if (! containsPredicate) {\n        return null;\n    }\n    return pairs;\n};\n\n//\n// This method is used to improve the localization of error messages by\n// choosing an alternative rather than throwing a\n// {@link NoViableAltException} in particular prediction scenarios where the\n// {@link //ERROR} state was reached during ATN simulation.\n//\n// <p>\n// The default implementation of this method uses the following\n// algorithm to identify an ATN configuration which successfully parsed the\n// decision entry rule. Choosing such an alternative ensures that the\n// {@link ParserRuleContext} returned by the calling rule will be complete\n// and valid, and the syntax error will be reported later at a more\n// localized location.</p>\n//\n// <ul>\n// <li>If a syntactically valid path or paths reach the end of the decision rule and\n// they are semantically valid if predicated, return the min associated alt.</li>\n// <li>Else, if a semantically invalid but syntactically valid path exist\n// or paths exist, return the minimum associated alt.\n// </li>\n// <li>Otherwise, return {@link ATN//INVALID_ALT_NUMBER}.</li>\n// </ul>\n//\n// <p>\n// In some scenarios, the algorithm described above could predict an\n// alternative which will result in a {@link FailedPredicateException} in\n// the parser. Specifically, this could occur if the <em>only</em> configuration\n// capable of successfully parsing to the end of the decision rule is\n// blocked by a semantic predicate. By choosing this alternative within\n// {@link //adaptivePredict} instead of throwing a\n// {@link NoViableAltException}, the resulting\n// {@link FailedPredicateException} in the parser will identify the specific\n// predicate which is preventing the parser from successfully parsing the\n// decision rule, which helps developers identify and correct logic errors\n// in semantic predicates.\n// </p>\n//\n// @param configs The ATN configurations which were valid immediately before\n// the {@link //ERROR} state was reached\n// @param outerContext The is the \\gamma_0 initial parser context from the paper\n// or the parser stack at the instant before prediction commences.\n//\n// @return The value to return from {@link //adaptivePredict}, or\n// {@link ATN//INVALID_ALT_NUMBER} if a suitable alternative was not\n// identified and {@link //adaptivePredict} should report an error instead.\n//\nParserATNSimulator.prototype.getSynValidOrSemInvalidAltThatFinishedDecisionEntryRule = function(configs, outerContext) {\n    var cfgs = this.splitAccordingToSemanticValidity(configs, outerContext);\n    var semValidConfigs = cfgs[0];\n    var semInvalidConfigs = cfgs[1];\n    var alt = this.getAltThatFinishedDecisionEntryRule(semValidConfigs);\n    if (alt!==ATN.INVALID_ALT_NUMBER) { // semantically/syntactically viable path exists\n        return alt;\n    }\n    // Is there a syntactically valid path with a failed pred?\n    if (semInvalidConfigs.items.length>0) {\n        alt = this.getAltThatFinishedDecisionEntryRule(semInvalidConfigs);\n        if (alt!==ATN.INVALID_ALT_NUMBER) { // syntactically viable path exists\n            return alt;\n        }\n    }\n    return ATN.INVALID_ALT_NUMBER;\n};\n\nParserATNSimulator.prototype.getAltThatFinishedDecisionEntryRule = function(configs) {\n    var alts = [];\n    for(var i=0;i<configs.items.length; i++) {\n        var c = configs.items[i];\n        if (c.reachesIntoOuterContext>0 || ((c.state instanceof RuleStopState) && c.context.hasEmptyPath())) {\n            if(alts.indexOf(c.alt)<0) {\n                alts.push(c.alt);\n            }\n        }\n    }\n    if (alts.length===0) {\n        return ATN.INVALID_ALT_NUMBER;\n    } else {\n        return Math.min.apply(null, alts);\n    }\n};\n// Walk the list of configurations and split them according to\n//  those that have preds evaluating to true/false.  If no pred, assume\n//  true pred and include in succeeded set.  Returns Pair of sets.\n//\n//  Create a new set so as not to alter the incoming parameter.\n//\n//  Assumption: the input stream has been restored to the starting point\n//  prediction, which is where predicates need to evaluate.\n//\nParserATNSimulator.prototype.splitAccordingToSemanticValidity = function( configs, outerContext) {\n    var succeeded = new ATNConfigSet(configs.fullCtx);\n    var failed = new ATNConfigSet(configs.fullCtx);\n    for(var i=0;i<configs.items.length; i++) {\n        var c = configs.items[i];\n        if (c.semanticContext !== SemanticContext.NONE) {\n            var predicateEvaluationResult = c.semanticContext.evaluate(this.parser, outerContext);\n            if (predicateEvaluationResult) {\n                succeeded.add(c);\n            } else {\n                failed.add(c);\n            }\n        } else {\n            succeeded.add(c);\n        }\n    }\n    return [succeeded, failed];\n};\n\n// Look through a list of predicate/alt pairs, returning alts for the\n//  pairs that win. A {@code NONE} predicate indicates an alt containing an\n//  unpredicated config which behaves as \"always true.\" If !complete\n//  then we stop at the first predicate that evaluates to true. This\n//  includes pairs with null predicates.\n//\nParserATNSimulator.prototype.evalSemanticContext = function(predPredictions, outerContext, complete) {\n    var predictions = new BitSet();\n    for(var i=0;i<predPredictions.length;i++) {\n    \tvar pair = predPredictions[i];\n        if (pair.pred === SemanticContext.NONE) {\n            predictions.add(pair.alt);\n            if (! complete) {\n                break;\n            }\n            continue;\n        }\n        var predicateEvaluationResult = pair.pred.evaluate(this.parser, outerContext);\n        if (this.debug || this.dfa_debug) {\n            console.log(\"eval pred \" + pair + \"=\" + predicateEvaluationResult);\n        }\n        if (predicateEvaluationResult) {\n            if (this.debug || this.dfa_debug) {\n                console.log(\"PREDICT \" + pair.alt);\n            }\n            predictions.add(pair.alt);\n            if (! complete) {\n                break;\n            }\n        }\n    }\n    return predictions;\n};\n\n// TODO: If we are doing predicates, there is no point in pursuing\n//     closure operations if we reach a DFA state that uniquely predicts\n//     alternative. We will not be caching that DFA state and it is a\n//     waste to pursue the closure. Might have to advance when we do\n//     ambig detection thought :(\n//\n\nParserATNSimulator.prototype.closure = function(config, configs, closureBusy, collectPredicates, fullCtx, treatEofAsEpsilon) {\n    var initialDepth = 0;\n    this.closureCheckingStopState(config, configs, closureBusy, collectPredicates,\n                             fullCtx, initialDepth, treatEofAsEpsilon);\n};\n\n\nParserATNSimulator.prototype.closureCheckingStopState = function(config, configs, closureBusy, collectPredicates, fullCtx, depth, treatEofAsEpsilon) {\n    if (this.debug || this.debug_closure) {\n        console.log(\"closure(\" + config.toString(this.parser,true) + \")\");\n        // console.log(\"configs(\" + configs.toString() + \")\");\n        if(config.reachesIntoOuterContext>50) {\n            throw \"problem\";\n        }\n    }\n    if (config.state instanceof RuleStopState) {\n        // We hit rule end. If we have context info, use it\n        // run thru all possible stack tops in ctx\n        if (! config.context.isEmpty()) {\n            for ( var i =0; i<config.context.length; i++) {\n                if (config.context.getReturnState(i) === PredictionContext.EMPTY_RETURN_STATE) {\n                    if (fullCtx) {\n                        configs.add(new ATNConfig({state:config.state, context:PredictionContext.EMPTY}, config), this.mergeCache);\n                        continue;\n                    } else {\n                        // we have no context info, just chase follow links (if greedy)\n                        if (this.debug) {\n                            console.log(\"FALLING off rule \" + this.getRuleName(config.state.ruleIndex));\n                        }\n                        this.closure_(config, configs, closureBusy, collectPredicates,\n                                 fullCtx, depth, treatEofAsEpsilon);\n                    }\n                    continue;\n                }\n                var returnState = this.atn.states[config.context.getReturnState(i)];\n                var newContext = config.context.getParent(i); // \"pop\" return state\n                var parms = {state:returnState, alt:config.alt, context:newContext, semanticContext:config.semanticContext};\n                var c = new ATNConfig(parms, null);\n                // While we have context to pop back from, we may have\n                // gotten that context AFTER having falling off a rule.\n                // Make sure we track that we are now out of context.\n                c.reachesIntoOuterContext = config.reachesIntoOuterContext;\n                this.closureCheckingStopState(c, configs, closureBusy, collectPredicates, fullCtx, depth - 1, treatEofAsEpsilon);\n            }\n            return;\n        } else if( fullCtx) {\n            // reached end of start rule\n            configs.add(config, this.mergeCache);\n            return;\n        } else {\n            // else if we have no context info, just chase follow links (if greedy)\n            if (this.debug) {\n                console.log(\"FALLING off rule \" + this.getRuleName(config.state.ruleIndex));\n            }\n        }\n    }\n    this.closure_(config, configs, closureBusy, collectPredicates, fullCtx, depth, treatEofAsEpsilon);\n};\n\n\n// Do the actual work of walking epsilon edges//\nParserATNSimulator.prototype.closure_ = function(config, configs, closureBusy, collectPredicates, fullCtx, depth, treatEofAsEpsilon) {\n    var p = config.state;\n    // optimization\n    if (! p.epsilonOnlyTransitions) {\n        configs.add(config, this.mergeCache);\n        // make sure to not return here, because EOF transitions can act as\n        // both epsilon transitions and non-epsilon transitions.\n    }\n    for(var i = 0;i<p.transitions.length; i++) {\n        if(i==0 && this.canDropLoopEntryEdgeInLeftRecursiveRule(config))\n            continue;\n\n        var t = p.transitions[i];\n        var continueCollecting = collectPredicates && !(t instanceof ActionTransition);\n        var c = this.getEpsilonTarget(config, t, continueCollecting, depth === 0, fullCtx, treatEofAsEpsilon);\n        if (c!==null) {\n            var newDepth = depth;\n            if ( config.state instanceof RuleStopState) {\n                // target fell off end of rule; mark resulting c as having dipped into outer context\n                // We can't get here if incoming config was rule stop and we had context\n                // track how far we dip into outer context.  Might\n                // come in handy and we avoid evaluating context dependent\n                // preds if this is > 0.\n\t\t\t\tif (this._dfa !== null && this._dfa.precedenceDfa) {\n\t\t\t\t\tif (t.outermostPrecedenceReturn === this._dfa.atnStartState.ruleIndex) {\n\t\t\t\t\t\tc.precedenceFilterSuppressed = true;\n\t\t\t\t\t}\n\t\t\t\t}\n\n                c.reachesIntoOuterContext += 1;\n                if (closureBusy.add(c)!==c) {\n                    // avoid infinite recursion for right-recursive rules\n                    continue;\n                }\n                configs.dipsIntoOuterContext = true; // TODO: can remove? only care when we add to set per middle of this method\n                newDepth -= 1;\n                if (this.debug) {\n                    console.log(\"dips into outer ctx: \" + c);\n                }\n            } else {\n                if (!t.isEpsilon && closureBusy.add(c)!==c){\n                    // avoid infinite recursion for EOF* and EOF+\n                    continue;\n                }\n                if (t instanceof RuleTransition) {\n                    // latch when newDepth goes negative - once we step out of the entry context we can't return\n                    if (newDepth >= 0) {\n                        newDepth += 1;\n                    }\n                }\n            }\n            this.closureCheckingStopState(c, configs, closureBusy, continueCollecting, fullCtx, newDepth, treatEofAsEpsilon);\n        }\n    }\n};\n\n\nParserATNSimulator.prototype.canDropLoopEntryEdgeInLeftRecursiveRule = function(config) {\n    // return False\n    var p = config.state;\n    // First check to see if we are in StarLoopEntryState generated during\n    // left-recursion elimination. For efficiency, also check if\n    // the context has an empty stack case. If so, it would mean\n    // global FOLLOW so we can't perform optimization\n    // Are we the special loop entry/exit state? or SLL wildcard\n    if(p.stateType != ATNState.STAR_LOOP_ENTRY)\n        return false;\n    if(p.stateType != ATNState.STAR_LOOP_ENTRY || !p.isPrecedenceDecision ||\n           config.context.isEmpty() || config.context.hasEmptyPath())\n        return false;\n\n    // Require all return states to return back to the same rule that p is in.\n    var numCtxs = config.context.length;\n    for(var i=0; i<numCtxs; i++) { // for each stack context\n        var returnState = this.atn.states[config.context.getReturnState(i)];\n        if (returnState.ruleIndex != p.ruleIndex)\n            return false;\n    }\n\n    var decisionStartState = p.transitions[0].target;\n    var blockEndStateNum = decisionStartState.endState.stateNumber;\n    var blockEndState = this.atn.states[blockEndStateNum];\n\n    // Verify that the top of each stack context leads to loop entry/exit\n    // state through epsilon edges and w/o leaving rule.\n    for(var i=0; i<numCtxs; i++) { // for each stack context\n        var returnStateNumber = config.context.getReturnState(i);\n        var returnState = this.atn.states[returnStateNumber];\n        // all states must have single outgoing epsilon edge\n        if (returnState.transitions.length != 1 || !returnState.transitions[0].isEpsilon)\n            return false;\n\n        // Look for prefix op case like 'not expr', (' type ')' expr\n        var returnStateTarget = returnState.transitions[0].target;\n        if ( returnState.stateType == ATNState.BLOCK_END && returnStateTarget == p )\n            continue;\n\n        // Look for 'expr op expr' or case where expr's return state is block end\n        // of (...)* internal block; the block end points to loop back\n        // which points to p but we don't need to check that\n        if ( returnState == blockEndState )\n            continue;\n\n        // Look for ternary expr ? expr : expr. The return state points at block end,\n        // which points at loop entry state\n        if ( returnStateTarget == blockEndState )\n            continue;\n\n        // Look for complex prefix 'between expr and expr' case where 2nd expr's\n        // return state points at block end state of (...)* internal block\n        if (returnStateTarget.stateType == ATNState.BLOCK_END && returnStateTarget.transitions.length == 1\n                && returnStateTarget.transitions[0].isEpsilon && returnStateTarget.transitions[0].target == p)\n            continue;\n\n        // anything else ain't conforming\n        return false;\n    }\n    return true;\n};\n\n\nParserATNSimulator.prototype.getRuleName = function( index) {\n    if (this.parser!==null && index>=0) {\n        return this.parser.ruleNames[index];\n    } else {\n        return \"<rule \" + index + \">\";\n    }\n};\n\nParserATNSimulator.prototype.getEpsilonTarget = function(config, t, collectPredicates, inContext, fullCtx, treatEofAsEpsilon) {\n    switch(t.serializationType) {\n    case Transition.RULE:\n        return this.ruleTransition(config, t);\n    case Transition.PRECEDENCE:\n        return this.precedenceTransition(config, t, collectPredicates, inContext, fullCtx);\n    case Transition.PREDICATE:\n        return this.predTransition(config, t, collectPredicates, inContext, fullCtx);\n    case Transition.ACTION:\n        return this.actionTransition(config, t);\n    case Transition.EPSILON:\n        return new ATNConfig({state:t.target}, config);\n    case Transition.ATOM:\n    case Transition.RANGE:\n    case Transition.SET:\n        // EOF transitions act like epsilon transitions after the first EOF\n        // transition is traversed\n        if (treatEofAsEpsilon) {\n            if (t.matches(Token.EOF, 0, 1)) {\n                return new ATNConfig({state: t.target}, config);\n            }\n        }\n        return null;\n    default:\n    \treturn null;\n    }\n};\n\nParserATNSimulator.prototype.actionTransition = function(config, t) {\n    if (this.debug) {\n        var index = t.actionIndex==-1 ? 65535 : t.actionIndex;\n        console.log(\"ACTION edge \" + t.ruleIndex + \":\" + index);\n    }\n    return new ATNConfig({state:t.target}, config);\n};\n\nParserATNSimulator.prototype.precedenceTransition = function(config, pt,  collectPredicates, inContext, fullCtx) {\n    if (this.debug) {\n        console.log(\"PRED (collectPredicates=\" + collectPredicates + \") \" +\n                pt.precedence + \">=_p, ctx dependent=true\");\n        if (this.parser!==null) {\n        \tconsole.log(\"context surrounding pred is \" + Utils.arrayToString(this.parser.getRuleInvocationStack()));\n        }\n    }\n    var c = null;\n    if (collectPredicates && inContext) {\n        if (fullCtx) {\n            // In full context mode, we can evaluate predicates on-the-fly\n            // during closure, which dramatically reduces the size of\n            // the config sets. It also obviates the need to test predicates\n            // later during conflict resolution.\n            var currentPosition = this._input.index;\n            this._input.seek(this._startIndex);\n            var predSucceeds = pt.getPredicate().evaluate(this.parser, this._outerContext);\n            this._input.seek(currentPosition);\n            if (predSucceeds) {\n                c = new ATNConfig({state:pt.target}, config); // no pred context\n            }\n        } else {\n            var newSemCtx = SemanticContext.andContext(config.semanticContext, pt.getPredicate());\n            c = new ATNConfig({state:pt.target, semanticContext:newSemCtx}, config);\n        }\n    } else {\n        c = new ATNConfig({state:pt.target}, config);\n    }\n    if (this.debug) {\n        console.log(\"config from pred transition=\" + c);\n    }\n    return c;\n};\n\nParserATNSimulator.prototype.predTransition = function(config, pt, collectPredicates, inContext, fullCtx) {\n    if (this.debug) {\n        console.log(\"PRED (collectPredicates=\" + collectPredicates + \") \" + pt.ruleIndex +\n                \":\" + pt.predIndex + \", ctx dependent=\" + pt.isCtxDependent);\n        if (this.parser!==null) {\n            console.log(\"context surrounding pred is \" + Utils.arrayToString(this.parser.getRuleInvocationStack()));\n        }\n    }\n    var c = null;\n    if (collectPredicates && ((pt.isCtxDependent && inContext) || ! pt.isCtxDependent)) {\n        if (fullCtx) {\n            // In full context mode, we can evaluate predicates on-the-fly\n            // during closure, which dramatically reduces the size of\n            // the config sets. It also obviates the need to test predicates\n            // later during conflict resolution.\n            var currentPosition = this._input.index;\n            this._input.seek(this._startIndex);\n            var predSucceeds = pt.getPredicate().evaluate(this.parser, this._outerContext);\n            this._input.seek(currentPosition);\n            if (predSucceeds) {\n                c = new ATNConfig({state:pt.target}, config); // no pred context\n            }\n        } else {\n            var newSemCtx = SemanticContext.andContext(config.semanticContext, pt.getPredicate());\n            c = new ATNConfig({state:pt.target, semanticContext:newSemCtx}, config);\n        }\n    } else {\n        c = new ATNConfig({state:pt.target}, config);\n    }\n    if (this.debug) {\n        console.log(\"config from pred transition=\" + c);\n    }\n    return c;\n};\n\nParserATNSimulator.prototype.ruleTransition = function(config, t) {\n    if (this.debug) {\n        console.log(\"CALL rule \" + this.getRuleName(t.target.ruleIndex) + \", ctx=\" + config.context);\n    }\n    var returnState = t.followState;\n    var newContext = SingletonPredictionContext.create(config.context, returnState.stateNumber);\n    return new ATNConfig({state:t.target, context:newContext}, config );\n};\n\nParserATNSimulator.prototype.getConflictingAlts = function(configs) {\n    var altsets = PredictionMode.getConflictingAltSubsets(configs);\n    return PredictionMode.getAlts(altsets);\n};\n\n // Sam pointed out a problem with the previous definition, v3, of\n // ambiguous states. If we have another state associated with conflicting\n // alternatives, we should keep going. For example, the following grammar\n //\n // s : (ID | ID ID?) ';' ;\n //\n // When the ATN simulation reaches the state before ';', it has a DFA\n // state that looks like: [12|1|[], 6|2|[], 12|2|[]]. Naturally\n // 12|1|[] and 12|2|[] conflict, but we cannot stop processing this node\n // because alternative to has another way to continue, via [6|2|[]].\n // The key is that we have a single state that has config's only associated\n // with a single alternative, 2, and crucially the state transitions\n // among the configurations are all non-epsilon transitions. That means\n // we don't consider any conflicts that include alternative 2. So, we\n // ignore the conflict between alts 1 and 2. We ignore a set of\n // conflicting alts when there is an intersection with an alternative\n // associated with a single alt state in the state&rarr;config-list map.\n //\n // It's also the case that we might have two conflicting configurations but\n // also a 3rd nonconflicting configuration for a different alternative:\n // [1|1|[], 1|2|[], 8|3|[]]. This can come about from grammar:\n //\n // a : A | A | A B ;\n //\n // After matching input A, we reach the stop state for rule A, state 1.\n // State 8 is the state right before B. Clearly alternatives 1 and 2\n // conflict and no amount of further lookahead will separate the two.\n // However, alternative 3 will be able to continue and so we do not\n // stop working on this state. In the previous example, we're concerned\n // with states associated with the conflicting alternatives. Here alt\n // 3 is not associated with the conflicting configs, but since we can continue\n // looking for input reasonably, I don't declare the state done. We\n // ignore a set of conflicting alts when we have an alternative\n // that we still need to pursue.\n//\n\nParserATNSimulator.prototype.getConflictingAltsOrUniqueAlt = function(configs) {\n    var conflictingAlts = null;\n    if (configs.uniqueAlt!== ATN.INVALID_ALT_NUMBER) {\n        conflictingAlts = new BitSet();\n        conflictingAlts.add(configs.uniqueAlt);\n    } else {\n        conflictingAlts = configs.conflictingAlts;\n    }\n    return conflictingAlts;\n};\n\nParserATNSimulator.prototype.getTokenName = function( t) {\n    if (t===Token.EOF) {\n        return \"EOF\";\n    }\n    if( this.parser!==null && this.parser.literalNames!==null) {\n        if (t >= this.parser.literalNames.length && t >= this.parser.symbolicNames.length) {\n            console.log(\"\" + t + \" ttype out of range: \" + this.parser.literalNames);\n            console.log(\"\" + this.parser.getInputStream().getTokens());\n        } else {\n            var name = this.parser.literalNames[t] || this.parser.symbolicNames[t];\n            return name + \"<\" + t + \">\";\n        }\n    }\n    return \"\" + t;\n};\n\nParserATNSimulator.prototype.getLookaheadName = function(input) {\n    return this.getTokenName(input.LA(1));\n};\n\n// Used for debugging in adaptivePredict around execATN but I cut\n//  it out for clarity now that alg. works well. We can leave this\n//  \"dead\" code for a bit.\n//\nParserATNSimulator.prototype.dumpDeadEndConfigs = function(nvae) {\n    console.log(\"dead end configs: \");\n    var decs = nvae.getDeadEndConfigs();\n    for(var i=0; i<decs.length; i++) {\n    \tvar c = decs[i];\n        var trans = \"no edges\";\n        if (c.state.transitions.length>0) {\n            var t = c.state.transitions[0];\n            if (t instanceof AtomTransition) {\n                trans = \"Atom \"+ this.getTokenName(t.label);\n            } else if (t instanceof SetTransition) {\n                var neg = (t instanceof NotSetTransition);\n                trans = (neg ? \"~\" : \"\") + \"Set \" + t.set;\n            }\n        }\n        console.error(c.toString(this.parser, true) + \":\" + trans);\n    }\n};\n\nParserATNSimulator.prototype.noViableAlt = function(input, outerContext, configs, startIndex) {\n    return new NoViableAltException(this.parser, input, input.get(startIndex), input.LT(1), configs, outerContext);\n};\n\nParserATNSimulator.prototype.getUniqueAlt = function(configs) {\n    var alt = ATN.INVALID_ALT_NUMBER;\n    for(var i=0;i<configs.items.length;i++) {\n    \tvar c = configs.items[i];\n        if (alt === ATN.INVALID_ALT_NUMBER) {\n            alt = c.alt // found first alt\n        } else if( c.alt!==alt) {\n            return ATN.INVALID_ALT_NUMBER;\n        }\n    }\n    return alt;\n};\n\n//\n// Add an edge to the DFA, if possible. This method calls\n// {@link //addDFAState} to ensure the {@code to} state is present in the\n// DFA. If {@code from} is {@code null}, or if {@code t} is outside the\n// range of edges that can be represented in the DFA tables, this method\n// returns without adding the edge to the DFA.\n//\n// <p>If {@code to} is {@code null}, this method returns {@code null}.\n// Otherwise, this method returns the {@link DFAState} returned by calling\n// {@link //addDFAState} for the {@code to} state.</p>\n//\n// @param dfa The DFA\n// @param from The source state for the edge\n// @param t The input symbol\n// @param to The target state for the edge\n//\n// @return If {@code to} is {@code null}, this method returns {@code null};\n// otherwise this method returns the result of calling {@link //addDFAState}\n// on {@code to}\n//\nParserATNSimulator.prototype.addDFAEdge = function(dfa, from_, t, to) {\n    if( this.debug) {\n        console.log(\"EDGE \" + from_ + \" -> \" + to + \" upon \" + this.getTokenName(t));\n    }\n    if (to===null) {\n        return null;\n    }\n    to = this.addDFAState(dfa, to); // used existing if possible not incoming\n    if (from_===null || t < -1 || t > this.atn.maxTokenType) {\n        return to;\n    }\n    if (from_.edges===null) {\n        from_.edges = [];\n    }\n    from_.edges[t+1] = to; // connect\n\n    if (this.debug) {\n        var literalNames = this.parser===null ? null : this.parser.literalNames;\n        var symbolicNames = this.parser===null ? null : this.parser.symbolicNames;\n        console.log(\"DFA=\\n\" + dfa.toString(literalNames, symbolicNames));\n    }\n    return to;\n};\n//\n// Add state {@code D} to the DFA if it is not already present, and return\n// the actual instance stored in the DFA. If a state equivalent to {@code D}\n// is already in the DFA, the existing state is returned. Otherwise this\n// method returns {@code D} after adding it to the DFA.\n//\n// <p>If {@code D} is {@link //ERROR}, this method returns {@link //ERROR} and\n// does not change the DFA.</p>\n//\n// @param dfa The dfa\n// @param D The DFA state to add\n// @return The state stored in the DFA. This will be either the existing\n// state if {@code D} is already in the DFA, or {@code D} itself if the\n// state was not already present.\n//\nParserATNSimulator.prototype.addDFAState = function(dfa, D) {\n    if (D == ATNSimulator.ERROR) {\n        return D;\n    }\n    var existing = dfa.states.get(D);\n    if(existing!==null) {\n        return existing;\n    }\n    D.stateNumber = dfa.states.length;\n    if (! D.configs.readOnly) {\n        D.configs.optimizeConfigs(this);\n        D.configs.setReadonly(true);\n    }\n    dfa.states.add(D);\n    if (this.debug) {\n        console.log(\"adding new DFA state: \" + D);\n    }\n    return D;\n};\n\nParserATNSimulator.prototype.reportAttemptingFullContext = function(dfa, conflictingAlts, configs, startIndex, stopIndex) {\n    if (this.debug || this.retry_debug) {\n        var interval = new Interval(startIndex, stopIndex + 1);\n        console.log(\"reportAttemptingFullContext decision=\" + dfa.decision + \":\" + configs +\n                           \", input=\" + this.parser.getTokenStream().getText(interval));\n    }\n    if (this.parser!==null) {\n        this.parser.getErrorListenerDispatch().reportAttemptingFullContext(this.parser, dfa, startIndex, stopIndex, conflictingAlts, configs);\n    }\n};\n\nParserATNSimulator.prototype.reportContextSensitivity = function(dfa, prediction, configs, startIndex, stopIndex) {\n    if (this.debug || this.retry_debug) {\n        var interval = new Interval(startIndex, stopIndex + 1);\n        console.log(\"reportContextSensitivity decision=\" + dfa.decision + \":\" + configs +\n                           \", input=\" + this.parser.getTokenStream().getText(interval));\n    }\n    if (this.parser!==null) {\n        this.parser.getErrorListenerDispatch().reportContextSensitivity(this.parser, dfa, startIndex, stopIndex, prediction, configs);\n    }\n};\n\n// If context sensitive parsing, we know it's ambiguity not conflict//\nParserATNSimulator.prototype.reportAmbiguity = function(dfa, D, startIndex, stopIndex,\n                               exact, ambigAlts, configs ) {\n    if (this.debug || this.retry_debug) {\n        var interval = new Interval(startIndex, stopIndex + 1);\n        console.log(\"reportAmbiguity \" + ambigAlts + \":\" + configs +\n                           \", input=\" + this.parser.getTokenStream().getText(interval));\n    }\n    if (this.parser!==null) {\n        this.parser.getErrorListenerDispatch().reportAmbiguity(this.parser, dfa, startIndex, stopIndex, exact, ambigAlts, configs);\n    }\n};\n\nexports.ParserATNSimulator = ParserATNSimulator;","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n//\n//\n// This enumeration defines the prediction modes available in ANTLR 4 along with\n// utility methods for analyzing configuration sets for conflicts and/or\n// ambiguities.\n\nvar Set = require('./../Utils').Set;\nvar Map = require('./../Utils').Map;\nvar BitSet = require('./../Utils').BitSet;\nvar AltDict = require('./../Utils').AltDict;\nvar ATN = require('./ATN').ATN;\nvar RuleStopState = require('./ATNState').RuleStopState;\nvar ATNConfigSet = require('./ATNConfigSet').ATNConfigSet;\nvar ATNConfig = require('./ATNConfig').ATNConfig;\nvar SemanticContext = require('./SemanticContext').SemanticContext;\nvar Hash = require(\"../Utils\").Hash;\nvar hashStuff = require('./../Utils').hashStuff;\nvar equalArrays = require('./../Utils').equalArrays;\n\nfunction PredictionMode() {\n\treturn this;\n}\n\n//\n// The SLL(*) prediction mode. This prediction mode ignores the current\n// parser context when making predictions. This is the fastest prediction\n// mode, and provides correct results for many grammars. This prediction\n// mode is more powerful than the prediction mode provided by ANTLR 3, but\n// may result in syntax errors for grammar and input combinations which are\n// not SLL.\n//\n// <p>\n// When using this prediction mode, the parser will either return a correct\n// parse tree (i.e. the same parse tree that would be returned with the\n// {@link //LL} prediction mode), or it will report a syntax error. If a\n// syntax error is encountered when using the {@link //SLL} prediction mode,\n// it may be due to either an actual syntax error in the input or indicate\n// that the particular combination of grammar and input requires the more\n// powerful {@link //LL} prediction abilities to complete successfully.</p>\n//\n// <p>\n// This prediction mode does not provide any guarantees for prediction\n// behavior for syntactically-incorrect inputs.</p>\n//\nPredictionMode.SLL = 0;\n//\n// The LL(*) prediction mode. This prediction mode allows the current parser\n// context to be used for resolving SLL conflicts that occur during\n// prediction. This is the fastest prediction mode that guarantees correct\n// parse results for all combinations of grammars with syntactically correct\n// inputs.\n//\n// <p>\n// When using this prediction mode, the parser will make correct decisions\n// for all syntactically-correct grammar and input combinations. However, in\n// cases where the grammar is truly ambiguous this prediction mode might not\n// report a precise answer for <em>exactly which</em> alternatives are\n// ambiguous.</p>\n//\n// <p>\n// This prediction mode does not provide any guarantees for prediction\n// behavior for syntactically-incorrect inputs.</p>\n//\nPredictionMode.LL = 1;\n//\n// The LL(*) prediction mode with exact ambiguity detection. In addition to\n// the correctness guarantees provided by the {@link //LL} prediction mode,\n// this prediction mode instructs the prediction algorithm to determine the\n// complete and exact set of ambiguous alternatives for every ambiguous\n// decision encountered while parsing.\n//\n// <p>\n// This prediction mode may be used for diagnosing ambiguities during\n// grammar development. Due to the performance overhead of calculating sets\n// of ambiguous alternatives, this prediction mode should be avoided when\n// the exact results are not necessary.</p>\n//\n// <p>\n// This prediction mode does not provide any guarantees for prediction\n// behavior for syntactically-incorrect inputs.</p>\n//\nPredictionMode.LL_EXACT_AMBIG_DETECTION = 2;\n\n\n//\n// Computes the SLL prediction termination condition.\n//\n// <p>\n// This method computes the SLL prediction termination condition for both of\n// the following cases.</p>\n//\n// <ul>\n// <li>The usual SLL+LL fallback upon SLL conflict</li>\n// <li>Pure SLL without LL fallback</li>\n// </ul>\n//\n// <p><strong>COMBINED SLL+LL PARSING</strong></p>\n//\n// <p>When LL-fallback is enabled upon SLL conflict, correct predictions are\n// ensured regardless of how the termination condition is computed by this\n// method. Due to the substantially higher cost of LL prediction, the\n// prediction should only fall back to LL when the additional lookahead\n// cannot lead to a unique SLL prediction.</p>\n//\n// <p>Assuming combined SLL+LL parsing, an SLL configuration set with only\n// conflicting subsets should fall back to full LL, even if the\n// configuration sets don't resolve to the same alternative (e.g.\n// {@code {1,2}} and {@code {3,4}}. If there is at least one non-conflicting\n// configuration, SLL could continue with the hopes that more lookahead will\n// resolve via one of those non-conflicting configurations.</p>\n//\n// <p>Here's the prediction termination rule them: SLL (for SLL+LL parsing)\n// stops when it sees only conflicting configuration subsets. In contrast,\n// full LL keeps going when there is uncertainty.</p>\n//\n// <p><strong>HEURISTIC</strong></p>\n//\n// <p>As a heuristic, we stop prediction when we see any conflicting subset\n// unless we see a state that only has one alternative associated with it.\n// The single-alt-state thing lets prediction continue upon rules like\n// (otherwise, it would admit defeat too soon):</p>\n//\n// <p>{@code [12|1|[], 6|2|[], 12|2|[]]. s : (ID | ID ID?) ';' ;}</p>\n//\n// <p>When the ATN simulation reaches the state before {@code ';'}, it has a\n// DFA state that looks like: {@code [12|1|[], 6|2|[], 12|2|[]]}. Naturally\n// {@code 12|1|[]} and {@code 12|2|[]} conflict, but we cannot stop\n// processing this node because alternative to has another way to continue,\n// via {@code [6|2|[]]}.</p>\n//\n// <p>It also let's us continue for this rule:</p>\n//\n// <p>{@code [1|1|[], 1|2|[], 8|3|[]] a : A | A | A B ;}</p>\n//\n// <p>After matching input A, we reach the stop state for rule A, state 1.\n// State 8 is the state right before B. Clearly alternatives 1 and 2\n// conflict and no amount of further lookahead will separate the two.\n// However, alternative 3 will be able to continue and so we do not stop\n// working on this state. In the previous example, we're concerned with\n// states associated with the conflicting alternatives. Here alt 3 is not\n// associated with the conflicting configs, but since we can continue\n// looking for input reasonably, don't declare the state done.</p>\n//\n// <p><strong>PURE SLL PARSING</strong></p>\n//\n// <p>To handle pure SLL parsing, all we have to do is make sure that we\n// combine stack contexts for configurations that differ only by semantic\n// predicate. From there, we can do the usual SLL termination heuristic.</p>\n//\n// <p><strong>PREDICATES IN SLL+LL PARSING</strong></p>\n//\n// <p>SLL decisions don't evaluate predicates until after they reach DFA stop\n// states because they need to create the DFA cache that works in all\n// semantic situations. In contrast, full LL evaluates predicates collected\n// during start state computation so it can ignore predicates thereafter.\n// This means that SLL termination detection can totally ignore semantic\n// predicates.</p>\n//\n// <p>Implementation-wise, {@link ATNConfigSet} combines stack contexts but not\n// semantic predicate contexts so we might see two configurations like the\n// following.</p>\n//\n// <p>{@code (s, 1, x, {}), (s, 1, x', {p})}</p>\n//\n// <p>Before testing these configurations against others, we have to merge\n// {@code x} and {@code x'} (without modifying the existing configurations).\n// For example, we test {@code (x+x')==x''} when looking for conflicts in\n// the following configurations.</p>\n//\n// <p>{@code (s, 1, x, {}), (s, 1, x', {p}), (s, 2, x'', {})}</p>\n//\n// <p>If the configuration set has predicates (as indicated by\n// {@link ATNConfigSet//hasSemanticContext}), this algorithm makes a copy of\n// the configurations to strip out all of the predicates so that a standard\n// {@link ATNConfigSet} will merge everything ignoring predicates.</p>\n//\nPredictionMode.hasSLLConflictTerminatingPrediction = function( mode, configs) {\n    // Configs in rule stop states indicate reaching the end of the decision\n    // rule (local context) or end of start rule (full context). If all\n    // configs meet this condition, then none of the configurations is able\n    // to match additional input so we terminate prediction.\n    //\n    if (PredictionMode.allConfigsInRuleStopStates(configs)) {\n        return true;\n    }\n    // pure SLL mode parsing\n    if (mode === PredictionMode.SLL) {\n        // Don't bother with combining configs from different semantic\n        // contexts if we can fail over to full LL; costs more time\n        // since we'll often fail over anyway.\n        if (configs.hasSemanticContext) {\n            // dup configs, tossing out semantic predicates\n            var dup = new ATNConfigSet();\n            for(var i=0;i<configs.items.length;i++) {\n            \tvar c = configs.items[i];\n                c = new ATNConfig({semanticContext:SemanticContext.NONE}, c);\n                dup.add(c);\n            }\n            configs = dup;\n        }\n        // now we have combined contexts for configs with dissimilar preds\n    }\n    // pure SLL or combined SLL+LL mode parsing\n    var altsets = PredictionMode.getConflictingAltSubsets(configs);\n    return PredictionMode.hasConflictingAltSet(altsets) && !PredictionMode.hasStateAssociatedWithOneAlt(configs);\n};\n\n// Checks if any configuration in {@code configs} is in a\n// {@link RuleStopState}. Configurations meeting this condition have reached\n// the end of the decision rule (local context) or end of start rule (full\n// context).\n//\n// @param configs the configuration set to test\n// @return {@code true} if any configuration in {@code configs} is in a\n// {@link RuleStopState}, otherwise {@code false}\nPredictionMode.hasConfigInRuleStopState = function(configs) {\n\tfor(var i=0;i<configs.items.length;i++) {\n\t\tvar c = configs.items[i];\n        if (c.state instanceof RuleStopState) {\n            return true;\n        }\n\t}\n    return false;\n};\n\n// Checks if all configurations in {@code configs} are in a\n// {@link RuleStopState}. Configurations meeting this condition have reached\n// the end of the decision rule (local context) or end of start rule (full\n// context).\n//\n// @param configs the configuration set to test\n// @return {@code true} if all configurations in {@code configs} are in a\n// {@link RuleStopState}, otherwise {@code false}\nPredictionMode.allConfigsInRuleStopStates = function(configs) {\n\tfor(var i=0;i<configs.items.length;i++) {\n\t\tvar c = configs.items[i];\n        if (!(c.state instanceof RuleStopState)) {\n            return false;\n        }\n\t}\n    return true;\n};\n\n//\n// Full LL prediction termination.\n//\n// <p>Can we stop looking ahead during ATN simulation or is there some\n// uncertainty as to which alternative we will ultimately pick, after\n// consuming more input? Even if there are partial conflicts, we might know\n// that everything is going to resolve to the same minimum alternative. That\n// means we can stop since no more lookahead will change that fact. On the\n// other hand, there might be multiple conflicts that resolve to different\n// minimums. That means we need more look ahead to decide which of those\n// alternatives we should predict.</p>\n//\n// <p>The basic idea is to split the set of configurations {@code C}, into\n// conflicting subsets {@code (s, _, ctx, _)} and singleton subsets with\n// non-conflicting configurations. Two configurations conflict if they have\n// identical {@link ATNConfig//state} and {@link ATNConfig//context} values\n// but different {@link ATNConfig//alt} value, e.g. {@code (s, i, ctx, _)}\n// and {@code (s, j, ctx, _)} for {@code i!=j}.</p>\n//\n// <p>Reduce these configuration subsets to the set of possible alternatives.\n// You can compute the alternative subsets in one pass as follows:</p>\n//\n// <p>{@code A_s,ctx = {i | (s, i, ctx, _)}} for each configuration in\n// {@code C} holding {@code s} and {@code ctx} fixed.</p>\n//\n// <p>Or in pseudo-code, for each configuration {@code c} in {@code C}:</p>\n//\n// <pre>\n// map[c] U= c.{@link ATNConfig//alt alt} // map hash/equals uses s and x, not\n// alt and not pred\n// </pre>\n//\n// <p>The values in {@code map} are the set of {@code A_s,ctx} sets.</p>\n//\n// <p>If {@code |A_s,ctx|=1} then there is no conflict associated with\n// {@code s} and {@code ctx}.</p>\n//\n// <p>Reduce the subsets to singletons by choosing a minimum of each subset. If\n// the union of these alternative subsets is a singleton, then no amount of\n// more lookahead will help us. We will always pick that alternative. If,\n// however, there is more than one alternative, then we are uncertain which\n// alternative to predict and must continue looking for resolution. We may\n// or may not discover an ambiguity in the future, even if there are no\n// conflicting subsets this round.</p>\n//\n// <p>The biggest sin is to terminate early because it means we've made a\n// decision but were uncertain as to the eventual outcome. We haven't used\n// enough lookahead. On the other hand, announcing a conflict too late is no\n// big deal; you will still have the conflict. It's just inefficient. It\n// might even look until the end of file.</p>\n//\n// <p>No special consideration for semantic predicates is required because\n// predicates are evaluated on-the-fly for full LL prediction, ensuring that\n// no configuration contains a semantic context during the termination\n// check.</p>\n//\n// <p><strong>CONFLICTING CONFIGS</strong></p>\n//\n// <p>Two configurations {@code (s, i, x)} and {@code (s, j, x')}, conflict\n// when {@code i!=j} but {@code x=x'}. Because we merge all\n// {@code (s, i, _)} configurations together, that means that there are at\n// most {@code n} configurations associated with state {@code s} for\n// {@code n} possible alternatives in the decision. The merged stacks\n// complicate the comparison of configuration contexts {@code x} and\n// {@code x'}. Sam checks to see if one is a subset of the other by calling\n// merge and checking to see if the merged result is either {@code x} or\n// {@code x'}. If the {@code x} associated with lowest alternative {@code i}\n// is the superset, then {@code i} is the only possible prediction since the\n// others resolve to {@code min(i)} as well. However, if {@code x} is\n// associated with {@code j>i} then at least one stack configuration for\n// {@code j} is not in conflict with alternative {@code i}. The algorithm\n// should keep going, looking for more lookahead due to the uncertainty.</p>\n//\n// <p>For simplicity, I'm doing a equality check between {@code x} and\n// {@code x'} that lets the algorithm continue to consume lookahead longer\n// than necessary. The reason I like the equality is of course the\n// simplicity but also because that is the test you need to detect the\n// alternatives that are actually in conflict.</p>\n//\n// <p><strong>CONTINUE/STOP RULE</strong></p>\n//\n// <p>Continue if union of resolved alternative sets from non-conflicting and\n// conflicting alternative subsets has more than one alternative. We are\n// uncertain about which alternative to predict.</p>\n//\n// <p>The complete set of alternatives, {@code [i for (_,i,_)]}, tells us which\n// alternatives are still in the running for the amount of input we've\n// consumed at this point. The conflicting sets let us to strip away\n// configurations that won't lead to more states because we resolve\n// conflicts to the configuration with a minimum alternate for the\n// conflicting set.</p>\n//\n// <p><strong>CASES</strong></p>\n//\n// <ul>\n//\n// <li>no conflicts and more than 1 alternative in set =&gt; continue</li>\n//\n// <li> {@code (s, 1, x)}, {@code (s, 2, x)}, {@code (s, 3, z)},\n// {@code (s', 1, y)}, {@code (s', 2, y)} yields non-conflicting set\n// {@code {3}} U conflicting sets {@code min({1,2})} U {@code min({1,2})} =\n// {@code {1,3}} =&gt; continue\n// </li>\n//\n// <li>{@code (s, 1, x)}, {@code (s, 2, x)}, {@code (s', 1, y)},\n// {@code (s', 2, y)}, {@code (s'', 1, z)} yields non-conflicting set\n// {@code {1}} U conflicting sets {@code min({1,2})} U {@code min({1,2})} =\n// {@code {1}} =&gt; stop and predict 1</li>\n//\n// <li>{@code (s, 1, x)}, {@code (s, 2, x)}, {@code (s', 1, y)},\n// {@code (s', 2, y)} yields conflicting, reduced sets {@code {1}} U\n// {@code {1}} = {@code {1}} =&gt; stop and predict 1, can announce\n// ambiguity {@code {1,2}}</li>\n//\n// <li>{@code (s, 1, x)}, {@code (s, 2, x)}, {@code (s', 2, y)},\n// {@code (s', 3, y)} yields conflicting, reduced sets {@code {1}} U\n// {@code {2}} = {@code {1,2}} =&gt; continue</li>\n//\n// <li>{@code (s, 1, x)}, {@code (s, 2, x)}, {@code (s', 3, y)},\n// {@code (s', 4, y)} yields conflicting, reduced sets {@code {1}} U\n// {@code {3}} = {@code {1,3}} =&gt; continue</li>\n//\n// </ul>\n//\n// <p><strong>EXACT AMBIGUITY DETECTION</strong></p>\n//\n// <p>If all states report the same conflicting set of alternatives, then we\n// know we have the exact ambiguity set.</p>\n//\n// <p><code>|A_<em>i</em>|&gt;1</code> and\n// <code>A_<em>i</em> = A_<em>j</em></code> for all <em>i</em>, <em>j</em>.</p>\n//\n// <p>In other words, we continue examining lookahead until all {@code A_i}\n// have more than one alternative and all {@code A_i} are the same. If\n// {@code A={{1,2}, {1,3}}}, then regular LL prediction would terminate\n// because the resolved set is {@code {1}}. To determine what the real\n// ambiguity is, we have to know whether the ambiguity is between one and\n// two or one and three so we keep going. We can only stop prediction when\n// we need exact ambiguity detection when the sets look like\n// {@code A={{1,2}}} or {@code {{1,2},{1,2}}}, etc...</p>\n//\nPredictionMode.resolvesToJustOneViableAlt = function(altsets) {\n    return PredictionMode.getSingleViableAlt(altsets);\n};\n\n//\n// Determines if every alternative subset in {@code altsets} contains more\n// than one alternative.\n//\n// @param altsets a collection of alternative subsets\n// @return {@code true} if every {@link BitSet} in {@code altsets} has\n// {@link BitSet//cardinality cardinality} &gt; 1, otherwise {@code false}\n//\nPredictionMode.allSubsetsConflict = function(altsets) {\n    return ! PredictionMode.hasNonConflictingAltSet(altsets);\n};\n//\n// Determines if any single alternative subset in {@code altsets} contains\n// exactly one alternative.\n//\n// @param altsets a collection of alternative subsets\n// @return {@code true} if {@code altsets} contains a {@link BitSet} with\n// {@link BitSet//cardinality cardinality} 1, otherwise {@code false}\n//\nPredictionMode.hasNonConflictingAltSet = function(altsets) {\n\tfor(var i=0;i<altsets.length;i++) {\n\t\tvar alts = altsets[i];\n        if (alts.length===1) {\n            return true;\n        }\n\t}\n    return false;\n};\n\n//\n// Determines if any single alternative subset in {@code altsets} contains\n// more than one alternative.\n//\n// @param altsets a collection of alternative subsets\n// @return {@code true} if {@code altsets} contains a {@link BitSet} with\n// {@link BitSet//cardinality cardinality} &gt; 1, otherwise {@code false}\n//\nPredictionMode.hasConflictingAltSet = function(altsets) {\n\tfor(var i=0;i<altsets.length;i++) {\n\t\tvar alts = altsets[i];\n        if (alts.length>1) {\n            return true;\n        }\n\t}\n    return false;\n};\n\n//\n// Determines if every alternative subset in {@code altsets} is equivalent.\n//\n// @param altsets a collection of alternative subsets\n// @return {@code true} if every member of {@code altsets} is equal to the\n// others, otherwise {@code false}\n//\nPredictionMode.allSubsetsEqual = function(altsets) {\n    var first = null;\n\tfor(var i=0;i<altsets.length;i++) {\n\t\tvar alts = altsets[i];\n        if (first === null) {\n            first = alts;\n        } else if (alts!==first) {\n            return false;\n        }\n\t}\n    return true;\n};\n\n//\n// Returns the unique alternative predicted by all alternative subsets in\n// {@code altsets}. If no such alternative exists, this method returns\n// {@link ATN//INVALID_ALT_NUMBER}.\n//\n// @param altsets a collection of alternative subsets\n//\nPredictionMode.getUniqueAlt = function(altsets) {\n    var all = PredictionMode.getAlts(altsets);\n    if (all.length===1) {\n        return all.minValue();\n    } else {\n        return ATN.INVALID_ALT_NUMBER;\n    }\n};\n\n// Gets the complete set of represented alternatives for a collection of\n// alternative subsets. This method returns the union of each {@link BitSet}\n// in {@code altsets}.\n//\n// @param altsets a collection of alternative subsets\n// @return the set of represented alternatives in {@code altsets}\n//\nPredictionMode.getAlts = function(altsets) {\n    var all = new BitSet();\n    altsets.map( function(alts) { all.or(alts); });\n    return all;\n};\n\n//\n// This function gets the conflicting alt subsets from a configuration set.\n// For each configuration {@code c} in {@code configs}:\n//\n// <pre>\n// map[c] U= c.{@link ATNConfig//alt alt} // map hash/equals uses s and x, not\n// alt and not pred\n// </pre>\n\nPredictionMode.getConflictingAltSubsets = function(configs) {\n    var configToAlts = new Map();\n    configToAlts.hashFunction = function(cfg) { hashStuff(cfg.state.stateNumber, cfg.context); };\n    configToAlts.equalsFunction = function(c1, c2) { return c1.state.stateNumber==c2.state.stateNumber && c1.context.equals(c2.context);}\n    configs.items.map(function(cfg) {\n        var alts = configToAlts.get(cfg);\n        if (alts === null) {\n            alts = new BitSet();\n            configToAlts.put(cfg, alts);\n        }\n        alts.add(cfg.alt);\n\t});\n    return configToAlts.getValues();\n};\n\n//\n// Get a map from state to alt subset from a configuration set. For each\n// configuration {@code c} in {@code configs}:\n//\n// <pre>\n// map[c.{@link ATNConfig//state state}] U= c.{@link ATNConfig//alt alt}\n// </pre>\n//\nPredictionMode.getStateToAltMap = function(configs) {\n    var m = new AltDict();\n    configs.items.map(function(c) {\n        var alts = m.get(c.state);\n        if (alts === null) {\n            alts = new BitSet();\n            m.put(c.state, alts);\n        }\n        alts.add(c.alt);\n    });\n    return m;\n};\n\nPredictionMode.hasStateAssociatedWithOneAlt = function(configs) {\n    var values = PredictionMode.getStateToAltMap(configs).values();\n    for(var i=0;i<values.length;i++) {\n        if (values[i].length===1) {\n            return true;\n        }\n    }\n    return false;\n};\n\nPredictionMode.getSingleViableAlt = function(altsets) {\n    var result = null;\n\tfor(var i=0;i<altsets.length;i++) {\n\t\tvar alts = altsets[i];\n        var minAlt = alts.minValue();\n        if(result===null) {\n            result = minAlt;\n        } else if(result!==minAlt) { // more than 1 viable alt\n            return ATN.INVALID_ALT_NUMBER;\n        }\n\t}\n    return result;\n};\n\nexports.PredictionMode = PredictionMode;\n","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n//\n\n// A tree structure used to record the semantic context in which\n//  an ATN configuration is valid.  It's either a single predicate,\n//  a conjunction {@code p1&&p2}, or a sum of products {@code p1||p2}.\n//\n//  <p>I have scoped the {@link AND}, {@link OR}, and {@link Predicate} subclasses of\n//  {@link SemanticContext} within the scope of this outer class.</p>\n//\n\nvar Set = require('./../Utils').Set;\nvar Hash = require('./../Utils').Hash;\n\nfunction SemanticContext() {\n\treturn this;\n}\n\nSemanticContext.prototype.hashCode = function() {\n    var hash = new Hash();\n    this.updateHashCode(hash);\n    return hash.finish();\n};\n\n// For context independent predicates, we evaluate them without a local\n// context (i.e., null context). That way, we can evaluate them without\n// having to create proper rule-specific context during prediction (as\n// opposed to the parser, which creates them naturally). In a practical\n// sense, this avoids a cast exception from RuleContext to myruleContext.\n//\n// <p>For context dependent predicates, we must pass in a local context so that\n// references such as $arg evaluate properly as _localctx.arg. We only\n// capture context dependent predicates in the context in which we begin\n// prediction, so we passed in the outer context here in case of context\n// dependent predicate evaluation.</p>\n//\nSemanticContext.prototype.evaluate = function(parser, outerContext) {\n};\n\n//\n// Evaluate the precedence predicates for the context and reduce the result.\n//\n// @param parser The parser instance.\n// @param outerContext The current parser context object.\n// @return The simplified semantic context after precedence predicates are\n// evaluated, which will be one of the following values.\n// <ul>\n// <li>{@link //NONE}: if the predicate simplifies to {@code true} after\n// precedence predicates are evaluated.</li>\n// <li>{@code null}: if the predicate simplifies to {@code false} after\n// precedence predicates are evaluated.</li>\n// <li>{@code this}: if the semantic context is not changed as a result of\n// precedence predicate evaluation.</li>\n// <li>A non-{@code null} {@link SemanticContext}: the new simplified\n// semantic context after precedence predicates are evaluated.</li>\n// </ul>\n//\nSemanticContext.prototype.evalPrecedence = function(parser, outerContext) {\n\treturn this;\n};\n\nSemanticContext.andContext = function(a, b) {\n\tif (a === null || a === SemanticContext.NONE) {\n\t\treturn b;\n\t}\n\tif (b === null || b === SemanticContext.NONE) {\n\t\treturn a;\n\t}\n\tvar result = new AND(a, b);\n\tif (result.opnds.length === 1) {\n\t\treturn result.opnds[0];\n\t} else {\n\t\treturn result;\n\t}\n};\n\nSemanticContext.orContext = function(a, b) {\n\tif (a === null) {\n\t\treturn b;\n\t}\n\tif (b === null) {\n\t\treturn a;\n\t}\n\tif (a === SemanticContext.NONE || b === SemanticContext.NONE) {\n\t\treturn SemanticContext.NONE;\n\t}\n\tvar result = new OR(a, b);\n\tif (result.opnds.length === 1) {\n\t\treturn result.opnds[0];\n\t} else {\n\t\treturn result;\n\t}\n};\n\nfunction Predicate(ruleIndex, predIndex, isCtxDependent) {\n\tSemanticContext.call(this);\n\tthis.ruleIndex = ruleIndex === undefined ? -1 : ruleIndex;\n\tthis.predIndex = predIndex === undefined ? -1 : predIndex;\n\tthis.isCtxDependent = isCtxDependent === undefined ? false : isCtxDependent; // e.g., $i ref in pred\n\treturn this;\n}\n\nPredicate.prototype = Object.create(SemanticContext.prototype);\nPredicate.prototype.constructor = Predicate;\n\n//The default {@link SemanticContext}, which is semantically equivalent to\n//a predicate of the form {@code {true}?}.\n//\nSemanticContext.NONE = new Predicate();\n\n\nPredicate.prototype.evaluate = function(parser, outerContext) {\n\tvar localctx = this.isCtxDependent ? outerContext : null;\n\treturn parser.sempred(localctx, this.ruleIndex, this.predIndex);\n};\n\nPredicate.prototype.updateHashCode = function(hash) {\n\thash.update(this.ruleIndex, this.predIndex, this.isCtxDependent);\n};\n\nPredicate.prototype.equals = function(other) {\n\tif (this === other) {\n\t\treturn true;\n\t} else if (!(other instanceof Predicate)) {\n\t\treturn false;\n\t} else {\n\t\treturn this.ruleIndex === other.ruleIndex &&\n\t\t\t\tthis.predIndex === other.predIndex &&\n\t\t\t\tthis.isCtxDependent === other.isCtxDependent;\n\t}\n};\n\nPredicate.prototype.toString = function() {\n\treturn \"{\" + this.ruleIndex + \":\" + this.predIndex + \"}?\";\n};\n\nfunction PrecedencePredicate(precedence) {\n\tSemanticContext.call(this);\n\tthis.precedence = precedence === undefined ? 0 : precedence;\n}\n\nPrecedencePredicate.prototype = Object.create(SemanticContext.prototype);\nPrecedencePredicate.prototype.constructor = PrecedencePredicate;\n\nPrecedencePredicate.prototype.evaluate = function(parser, outerContext) {\n\treturn parser.precpred(outerContext, this.precedence);\n};\n\nPrecedencePredicate.prototype.evalPrecedence = function(parser, outerContext) {\n\tif (parser.precpred(outerContext, this.precedence)) {\n\t\treturn SemanticContext.NONE;\n\t} else {\n\t\treturn null;\n\t}\n};\n\nPrecedencePredicate.prototype.compareTo = function(other) {\n\treturn this.precedence - other.precedence;\n};\n\nPrecedencePredicate.prototype.updateHashCode = function(hash) {\n    hash.update(31);\n};\n\nPrecedencePredicate.prototype.equals = function(other) {\n\tif (this === other) {\n\t\treturn true;\n\t} else if (!(other instanceof PrecedencePredicate)) {\n\t\treturn false;\n\t} else {\n\t\treturn this.precedence === other.precedence;\n\t}\n};\n\nPrecedencePredicate.prototype.toString = function() {\n\treturn \"{\"+this.precedence+\">=prec}?\";\n};\n\n\n\nPrecedencePredicate.filterPrecedencePredicates = function(set) {\n\tvar result = [];\n\tset.values().map( function(context) {\n\t\tif (context instanceof PrecedencePredicate) {\n\t\t\tresult.push(context);\n\t\t}\n\t});\n\treturn result;\n};\n\n\n// A semantic context which is true whenever none of the contained contexts\n// is false.\n//\nfunction AND(a, b) {\n\tSemanticContext.call(this);\n\tvar operands = new Set();\n\tif (a instanceof AND) {\n\t\ta.opnds.map(function(o) {\n\t\t\toperands.add(o);\n\t\t});\n\t} else {\n\t\toperands.add(a);\n\t}\n\tif (b instanceof AND) {\n\t\tb.opnds.map(function(o) {\n\t\t\toperands.add(o);\n\t\t});\n\t} else {\n\t\toperands.add(b);\n\t}\n\tvar precedencePredicates = PrecedencePredicate.filterPrecedencePredicates(operands);\n\tif (precedencePredicates.length > 0) {\n\t\t// interested in the transition with the lowest precedence\n\t\tvar reduced = null;\n\t\tprecedencePredicates.map( function(p) {\n\t\t\tif(reduced===null || p.precedence<reduced.precedence) {\n\t\t\t\treduced = p;\n\t\t\t}\n\t\t});\n\t\toperands.add(reduced);\n\t}\n\tthis.opnds = operands.values();\n\treturn this;\n}\n\nAND.prototype = Object.create(SemanticContext.prototype);\nAND.prototype.constructor = AND;\n\nAND.prototype.equals = function(other) {\n\tif (this === other) {\n\t\treturn true;\n\t} else if (!(other instanceof AND)) {\n\t\treturn false;\n\t} else {\n\t\treturn this.opnds === other.opnds;\n\t}\n};\n\nAND.prototype.updateHashCode = function(hash) {\n    hash.update(this.opnds, \"AND\");\n};\n//\n// {@inheritDoc}\n//\n// <p>\n// The evaluation of predicates by this context is short-circuiting, but\n// unordered.</p>\n//\nAND.prototype.evaluate = function(parser, outerContext) {\n\tfor (var i = 0; i < this.opnds.length; i++) {\n\t\tif (!this.opnds[i].evaluate(parser, outerContext)) {\n\t\t\treturn false;\n\t\t}\n\t}\n\treturn true;\n};\n\nAND.prototype.evalPrecedence = function(parser, outerContext) {\n\tvar differs = false;\n\tvar operands = [];\n\tfor (var i = 0; i < this.opnds.length; i++) {\n\t\tvar context = this.opnds[i];\n\t\tvar evaluated = context.evalPrecedence(parser, outerContext);\n\t\tdiffers |= (evaluated !== context);\n\t\tif (evaluated === null) {\n\t\t\t// The AND context is false if any element is false\n\t\t\treturn null;\n\t\t} else if (evaluated !== SemanticContext.NONE) {\n\t\t\t// Reduce the result by skipping true elements\n\t\t\toperands.push(evaluated);\n\t\t}\n\t}\n\tif (!differs) {\n\t\treturn this;\n\t}\n\tif (operands.length === 0) {\n\t\t// all elements were true, so the AND context is true\n\t\treturn SemanticContext.NONE;\n\t}\n\tvar result = null;\n\toperands.map(function(o) {\n\t\tresult = result === null ? o : SemanticContext.andContext(result, o);\n\t});\n\treturn result;\n};\n\nAND.prototype.toString = function() {\n\tvar s = \"\";\n\tthis.opnds.map(function(o) {\n\t\ts += \"&& \" + o.toString();\n\t});\n\treturn s.length > 3 ? s.slice(3) : s;\n};\n\n//\n// A semantic context which is true whenever at least one of the contained\n// contexts is true.\n//\nfunction OR(a, b) {\n\tSemanticContext.call(this);\n\tvar operands = new Set();\n\tif (a instanceof OR) {\n\t\ta.opnds.map(function(o) {\n\t\t\toperands.add(o);\n\t\t});\n\t} else {\n\t\toperands.add(a);\n\t}\n\tif (b instanceof OR) {\n\t\tb.opnds.map(function(o) {\n\t\t\toperands.add(o);\n\t\t});\n\t} else {\n\t\toperands.add(b);\n\t}\n\n\tvar precedencePredicates = PrecedencePredicate.filterPrecedencePredicates(operands);\n\tif (precedencePredicates.length > 0) {\n\t\t// interested in the transition with the highest precedence\n\t\tvar s = precedencePredicates.sort(function(a, b) {\n\t\t\treturn a.compareTo(b);\n\t\t});\n\t\tvar reduced = s[s.length-1];\n\t\toperands.add(reduced);\n\t}\n\tthis.opnds = operands.values();\n\treturn this;\n}\n\nOR.prototype = Object.create(SemanticContext.prototype);\nOR.prototype.constructor = OR;\n\nOR.prototype.constructor = function(other) {\n\tif (this === other) {\n\t\treturn true;\n\t} else if (!(other instanceof OR)) {\n\t\treturn false;\n\t} else {\n\t\treturn this.opnds === other.opnds;\n\t}\n};\n\nOR.prototype.updateHashCode = function(hash) {\n    hash.update(this.opnds, \"OR\");\n};\n\n// <p>\n// The evaluation of predicates by this context is short-circuiting, but\n// unordered.</p>\n//\nOR.prototype.evaluate = function(parser, outerContext) {\n\tfor (var i = 0; i < this.opnds.length; i++) {\n\t\tif (this.opnds[i].evaluate(parser, outerContext)) {\n\t\t\treturn true;\n\t\t}\n\t}\n\treturn false;\n};\n\nOR.prototype.evalPrecedence = function(parser, outerContext) {\n\tvar differs = false;\n\tvar operands = [];\n\tfor (var i = 0; i < this.opnds.length; i++) {\n\t\tvar context = this.opnds[i];\n\t\tvar evaluated = context.evalPrecedence(parser, outerContext);\n\t\tdiffers |= (evaluated !== context);\n\t\tif (evaluated === SemanticContext.NONE) {\n\t\t\t// The OR context is true if any element is true\n\t\t\treturn SemanticContext.NONE;\n\t\t} else if (evaluated !== null) {\n\t\t\t// Reduce the result by skipping false elements\n\t\t\toperands.push(evaluated);\n\t\t}\n\t}\n\tif (!differs) {\n\t\treturn this;\n\t}\n\tif (operands.length === 0) {\n\t\t// all elements were false, so the OR context is false\n\t\treturn null;\n\t}\n\tvar result = null;\n\toperands.map(function(o) {\n\t\treturn result === null ? o : SemanticContext.orContext(result, o);\n\t});\n\treturn result;\n};\n\nOR.prototype.toString = function() {\n\tvar s = \"\";\n\tthis.opnds.map(function(o) {\n\t\ts += \"|| \" + o.toString();\n\t});\n\treturn s.length > 3 ? s.slice(3) : s;\n};\n\nexports.SemanticContext = SemanticContext;\nexports.PrecedencePredicate = PrecedencePredicate;\nexports.Predicate = Predicate;\n","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n//\n\n//  An ATN transition between any two ATN states.  Subclasses define\n//  atom, set, epsilon, action, predicate, rule transitions.\n//\n//  <p>This is a one way link.  It emanates from a state (usually via a list of\n//  transitions) and has a target state.</p>\n//\n//  <p>Since we never have to change the ATN transitions once we construct it,\n//  we can fix these transitions as specific classes. The DFA transitions\n//  on the other hand need to update the labels as it adds transitions to\n//  the states. We'll use the term Edge for the DFA to distinguish them from\n//  ATN transitions.</p>\n\nvar Token = require('./../Token').Token;\nvar Interval = require('./../IntervalSet').Interval;\nvar IntervalSet = require('./../IntervalSet').IntervalSet;\nvar Predicate = require('./SemanticContext').Predicate;\nvar PrecedencePredicate = require('./SemanticContext').PrecedencePredicate;\n\nfunction Transition (target) {\n    // The target of this transition.\n    if (target===undefined || target===null) {\n        throw \"target cannot be null.\";\n    }\n    this.target = target;\n    // Are we epsilon, action, sempred?\n    this.isEpsilon = false;\n    this.label = null;\n    return this;\n}\n    // constants for serialization\nTransition.EPSILON = 1;\nTransition.RANGE = 2;\nTransition.RULE = 3;\nTransition.PREDICATE = 4; // e.g., {isType(input.LT(1))}?\nTransition.ATOM = 5;\nTransition.ACTION = 6;\nTransition.SET = 7; // ~(A|B) or ~atom, wildcard, which convert to next 2\nTransition.NOT_SET = 8;\nTransition.WILDCARD = 9;\nTransition.PRECEDENCE = 10;\n\nTransition.serializationNames = [\n            \"INVALID\",\n            \"EPSILON\",\n            \"RANGE\",\n            \"RULE\",\n            \"PREDICATE\",\n            \"ATOM\",\n            \"ACTION\",\n            \"SET\",\n            \"NOT_SET\",\n            \"WILDCARD\",\n            \"PRECEDENCE\"\n        ];\n\nTransition.serializationTypes = {\n        EpsilonTransition: Transition.EPSILON,\n        RangeTransition: Transition.RANGE,\n        RuleTransition: Transition.RULE,\n        PredicateTransition: Transition.PREDICATE,\n        AtomTransition: Transition.ATOM,\n        ActionTransition: Transition.ACTION,\n        SetTransition: Transition.SET,\n        NotSetTransition: Transition.NOT_SET,\n        WildcardTransition: Transition.WILDCARD,\n        PrecedencePredicateTransition: Transition.PRECEDENCE\n    };\n\n\n// TODO: make all transitions sets? no, should remove set edges\nfunction AtomTransition(target, label) {\n\tTransition.call(this, target);\n\tthis.label_ = label; // The token type or character value; or, signifies special label.\n    this.label = this.makeLabel();\n    this.serializationType = Transition.ATOM;\n    return this;\n}\n\nAtomTransition.prototype = Object.create(Transition.prototype);\nAtomTransition.prototype.constructor = AtomTransition;\n\nAtomTransition.prototype.makeLabel = function() {\n\tvar s = new IntervalSet();\n    s.addOne(this.label_);\n    return s;\n};\n\nAtomTransition.prototype.matches = function( symbol, minVocabSymbol,  maxVocabSymbol) {\n    return this.label_ === symbol;\n};\n\nAtomTransition.prototype.toString = function() {\n\treturn this.label_;\n};\n\nfunction RuleTransition(ruleStart, ruleIndex, precedence, followState) {\n\tTransition.call(this, ruleStart);\n    this.ruleIndex = ruleIndex; // ptr to the rule definition object for this rule ref\n    this.precedence = precedence;\n    this.followState = followState; // what node to begin computations following ref to rule\n    this.serializationType = Transition.RULE;\n    this.isEpsilon = true;\n    return this;\n}\n\nRuleTransition.prototype = Object.create(Transition.prototype);\nRuleTransition.prototype.constructor = RuleTransition;\n\nRuleTransition.prototype.matches = function(symbol, minVocabSymbol,  maxVocabSymbol) {\n\treturn false;\n};\n\n\nfunction EpsilonTransition(target, outermostPrecedenceReturn) {\n\tTransition.call(this, target);\n    this.serializationType = Transition.EPSILON;\n    this.isEpsilon = true;\n    this.outermostPrecedenceReturn = outermostPrecedenceReturn;\n    return this;\n}\n\nEpsilonTransition.prototype = Object.create(Transition.prototype);\nEpsilonTransition.prototype.constructor = EpsilonTransition;\n\nEpsilonTransition.prototype.matches = function( symbol, minVocabSymbol,  maxVocabSymbol) {\n\treturn false;\n};\n\nEpsilonTransition.prototype.toString = function() {\n\treturn \"epsilon\";\n};\n\nfunction RangeTransition(target, start, stop) {\n\tTransition.call(this, target);\n\tthis.serializationType = Transition.RANGE;\n    this.start = start;\n    this.stop = stop;\n    this.label = this.makeLabel();\n    return this;\n}\n\nRangeTransition.prototype = Object.create(Transition.prototype);\nRangeTransition.prototype.constructor = RangeTransition;\n\nRangeTransition.prototype.makeLabel = function() {\n    var s = new IntervalSet();\n    s.addRange(this.start, this.stop);\n    return s;\n};\n\nRangeTransition.prototype.matches = function(symbol, minVocabSymbol,  maxVocabSymbol) {\n\treturn symbol >= this.start && symbol <= this.stop;\n};\n\nRangeTransition.prototype.toString = function() {\n\treturn \"'\" + String.fromCharCode(this.start) + \"'..'\" + String.fromCharCode(this.stop) + \"'\";\n};\n\nfunction AbstractPredicateTransition(target) {\n\tTransition.call(this, target);\n\treturn this;\n}\n\nAbstractPredicateTransition.prototype = Object.create(Transition.prototype);\nAbstractPredicateTransition.prototype.constructor = AbstractPredicateTransition;\n\nfunction PredicateTransition(target, ruleIndex, predIndex, isCtxDependent) {\n\tAbstractPredicateTransition.call(this, target);\n    this.serializationType = Transition.PREDICATE;\n    this.ruleIndex = ruleIndex;\n    this.predIndex = predIndex;\n    this.isCtxDependent = isCtxDependent; // e.g., $i ref in pred\n    this.isEpsilon = true;\n    return this;\n}\n\nPredicateTransition.prototype = Object.create(AbstractPredicateTransition.prototype);\nPredicateTransition.prototype.constructor = PredicateTransition;\n\nPredicateTransition.prototype.matches = function(symbol, minVocabSymbol,  maxVocabSymbol) {\n\treturn false;\n};\n\nPredicateTransition.prototype.getPredicate = function() {\n\treturn new Predicate(this.ruleIndex, this.predIndex, this.isCtxDependent);\n};\n\nPredicateTransition.prototype.toString = function() {\n\treturn \"pred_\" + this.ruleIndex + \":\" + this.predIndex;\n};\n\nfunction ActionTransition(target, ruleIndex, actionIndex, isCtxDependent) {\n\tTransition.call(this, target);\n    this.serializationType = Transition.ACTION;\n    this.ruleIndex = ruleIndex;\n    this.actionIndex = actionIndex===undefined ? -1 : actionIndex;\n    this.isCtxDependent = isCtxDependent===undefined ? false : isCtxDependent; // e.g., $i ref in pred\n    this.isEpsilon = true;\n    return this;\n}\n\nActionTransition.prototype = Object.create(Transition.prototype);\nActionTransition.prototype.constructor = ActionTransition;\n\n\nActionTransition.prototype.matches = function(symbol, minVocabSymbol,  maxVocabSymbol) {\n\treturn false;\n};\n\nActionTransition.prototype.toString = function() {\n\treturn \"action_\" + this.ruleIndex + \":\" + this.actionIndex;\n};\n\n\n// A transition containing a set of values.\nfunction SetTransition(target, set) {\n\tTransition.call(this, target);\n\tthis.serializationType = Transition.SET;\n    if (set !==undefined && set !==null) {\n        this.label = set;\n    } else {\n        this.label = new IntervalSet();\n        this.label.addOne(Token.INVALID_TYPE);\n    }\n    return this;\n}\n\nSetTransition.prototype = Object.create(Transition.prototype);\nSetTransition.prototype.constructor = SetTransition;\n\nSetTransition.prototype.matches = function(symbol, minVocabSymbol,  maxVocabSymbol) {\n\treturn this.label.contains(symbol);\n};\n\n\nSetTransition.prototype.toString = function() {\n\treturn this.label.toString();\n};\n\nfunction NotSetTransition(target, set) {\n\tSetTransition.call(this, target, set);\n\tthis.serializationType = Transition.NOT_SET;\n\treturn this;\n}\n\nNotSetTransition.prototype = Object.create(SetTransition.prototype);\nNotSetTransition.prototype.constructor = NotSetTransition;\n\nNotSetTransition.prototype.matches = function(symbol, minVocabSymbol,  maxVocabSymbol) {\n\treturn symbol >= minVocabSymbol && symbol <= maxVocabSymbol &&\n\t\t\t!SetTransition.prototype.matches.call(this, symbol, minVocabSymbol, maxVocabSymbol);\n};\n\nNotSetTransition.prototype.toString = function() {\n\treturn '~' + SetTransition.prototype.toString.call(this);\n};\n\nfunction WildcardTransition(target) {\n\tTransition.call(this, target);\n\tthis.serializationType = Transition.WILDCARD;\n\treturn this;\n}\n\nWildcardTransition.prototype = Object.create(Transition.prototype);\nWildcardTransition.prototype.constructor = WildcardTransition;\n\n\nWildcardTransition.prototype.matches = function(symbol, minVocabSymbol,  maxVocabSymbol) {\n\treturn symbol >= minVocabSymbol && symbol <= maxVocabSymbol;\n};\n\nWildcardTransition.prototype.toString = function() {\n\treturn \".\";\n};\n\nfunction PrecedencePredicateTransition(target, precedence) {\n\tAbstractPredicateTransition.call(this, target);\n    this.serializationType = Transition.PRECEDENCE;\n    this.precedence = precedence;\n    this.isEpsilon = true;\n    return this;\n}\n\nPrecedencePredicateTransition.prototype = Object.create(AbstractPredicateTransition.prototype);\nPrecedencePredicateTransition.prototype.constructor = PrecedencePredicateTransition;\n\nPrecedencePredicateTransition.prototype.matches = function(symbol, minVocabSymbol,  maxVocabSymbol) {\n\treturn false;\n};\n\nPrecedencePredicateTransition.prototype.getPredicate = function() {\n\treturn new PrecedencePredicate(this.precedence);\n};\n\nPrecedencePredicateTransition.prototype.toString = function() {\n\treturn this.precedence + \" >= _p\";\n};\n\nexports.Transition = Transition;\nexports.AtomTransition = AtomTransition;\nexports.SetTransition = SetTransition;\nexports.NotSetTransition = NotSetTransition;\nexports.RuleTransition = RuleTransition;\nexports.ActionTransition = ActionTransition;\nexports.EpsilonTransition = EpsilonTransition;\nexports.RangeTransition = RangeTransition;\nexports.WildcardTransition = WildcardTransition;\nexports.PredicateTransition = PredicateTransition;\nexports.PrecedencePredicateTransition = PrecedencePredicateTransition;\nexports.AbstractPredicateTransition = AbstractPredicateTransition;","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n\nexports.ATN = require('./ATN').ATN;\nexports.ATNDeserializer = require('./ATNDeserializer').ATNDeserializer;\nexports.LexerATNSimulator = require('./LexerATNSimulator').LexerATNSimulator;\nexports.ParserATNSimulator = require('./ParserATNSimulator').ParserATNSimulator;\nexports.PredictionMode = require('./PredictionMode').PredictionMode;\n","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n\nvar Set = require(\"../Utils\").Set;\nvar DFAState = require('./DFAState').DFAState;\nvar StarLoopEntryState = require('../atn/ATNState').StarLoopEntryState;\nvar ATNConfigSet = require('./../atn/ATNConfigSet').ATNConfigSet;\nvar DFASerializer = require('./DFASerializer').DFASerializer;\nvar LexerDFASerializer = require('./DFASerializer').LexerDFASerializer;\n\n\n\nfunction DFA(atnStartState, decision) {\n\tif (decision === undefined) {\n\t\tdecision = 0;\n\t}\n\t// From which ATN state did we create this DFA?\n\tthis.atnStartState = atnStartState;\n\tthis.decision = decision;\n\t// A set of all DFA states. Use {@link Map} so we can get old state back\n\t// ({@link Set} only allows you to see if it's there).\n\tthis._states = new Set();\n\tthis.s0 = null;\n\t// {@code true} if this DFA is for a precedence decision; otherwise,\n\t// {@code false}. This is the backing field for {@link //isPrecedenceDfa},\n\t// {@link //setPrecedenceDfa}.\n\tthis.precedenceDfa = false;\n    if (atnStartState instanceof StarLoopEntryState)\n    {\n        if (atnStartState.isPrecedenceDecision) {\n            this.precedenceDfa = true;\n            var precedenceState = new DFAState(null, new ATNConfigSet());\n            precedenceState.edges = [];\n            precedenceState.isAcceptState = false;\n            precedenceState.requiresFullContext = false;\n            this.s0 = precedenceState;\n        }\n    }\n\treturn this;\n}\n\n// Get the start state for a specific precedence value.\n//\n// @param precedence The current precedence.\n// @return The start state corresponding to the specified precedence, or\n// {@code null} if no start state exists for the specified precedence.\n//\n// @throws IllegalStateException if this is not a precedence DFA.\n// @see //isPrecedenceDfa()\n\nDFA.prototype.getPrecedenceStartState = function(precedence) {\n\tif (!(this.precedenceDfa)) {\n\t\tthrow (\"Only precedence DFAs may contain a precedence start state.\");\n\t}\n\t// s0.edges is never null for a precedence DFA\n\tif (precedence < 0 || precedence >= this.s0.edges.length) {\n\t\treturn null;\n\t}\n\treturn this.s0.edges[precedence] || null;\n};\n\n// Set the start state for a specific precedence value.\n//\n// @param precedence The current precedence.\n// @param startState The start state corresponding to the specified\n// precedence.\n//\n// @throws IllegalStateException if this is not a precedence DFA.\n// @see //isPrecedenceDfa()\n//\nDFA.prototype.setPrecedenceStartState = function(precedence, startState) {\n\tif (!(this.precedenceDfa)) {\n\t\tthrow (\"Only precedence DFAs may contain a precedence start state.\");\n\t}\n\tif (precedence < 0) {\n\t\treturn;\n\t}\n\n\t// synchronization on s0 here is ok. when the DFA is turned into a\n\t// precedence DFA, s0 will be initialized once and not updated again\n\t// s0.edges is never null for a precedence DFA\n\tthis.s0.edges[precedence] = startState;\n};\n\n//\n// Sets whether this is a precedence DFA. If the specified value differs\n// from the current DFA configuration, the following actions are taken;\n// otherwise no changes are made to the current DFA.\n//\n// <ul>\n// <li>The {@link //states} map is cleared</li>\n// <li>If {@code precedenceDfa} is {@code false}, the initial state\n// {@link //s0} is set to {@code null}; otherwise, it is initialized to a new\n// {@link DFAState} with an empty outgoing {@link DFAState//edges} array to\n// store the start states for individual precedence values.</li>\n// <li>The {@link //precedenceDfa} field is updated</li>\n// </ul>\n//\n// @param precedenceDfa {@code true} if this is a precedence DFA; otherwise,\n// {@code false}\n\nDFA.prototype.setPrecedenceDfa = function(precedenceDfa) {\n\tif (this.precedenceDfa!==precedenceDfa) {\n\t\tthis._states = new DFAStatesSet();\n\t\tif (precedenceDfa) {\n\t\t\tvar precedenceState = new DFAState(null, new ATNConfigSet());\n\t\t\tprecedenceState.edges = [];\n\t\t\tprecedenceState.isAcceptState = false;\n\t\t\tprecedenceState.requiresFullContext = false;\n\t\t\tthis.s0 = precedenceState;\n\t\t} else {\n\t\t\tthis.s0 = null;\n\t\t}\n\t\tthis.precedenceDfa = precedenceDfa;\n\t}\n};\n\nObject.defineProperty(DFA.prototype, \"states\", {\n\tget : function() {\n\t\treturn this._states;\n\t}\n});\n\n// Return a list of all states in this DFA, ordered by state number.\nDFA.prototype.sortedStates = function() {\n\tvar list = this._states.values();\n\treturn list.sort(function(a, b) {\n\t\treturn a.stateNumber - b.stateNumber;\n\t});\n};\n\nDFA.prototype.toString = function(literalNames, symbolicNames) {\n\tliteralNames = literalNames || null;\n\tsymbolicNames = symbolicNames || null;\n\tif (this.s0 === null) {\n\t\treturn \"\";\n\t}\n\tvar serializer = new DFASerializer(this, literalNames, symbolicNames);\n\treturn serializer.toString();\n};\n\nDFA.prototype.toLexerString = function() {\n\tif (this.s0 === null) {\n\t\treturn \"\";\n\t}\n\tvar serializer = new LexerDFASerializer(this);\n\treturn serializer.toString();\n};\n\nexports.DFA = DFA;\n","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n\n// A DFA walker that knows how to dump them to serialized strings.#/\n\n\nfunction DFASerializer(dfa, literalNames, symbolicNames) {\n\tthis.dfa = dfa;\n\tthis.literalNames = literalNames || [];\n\tthis.symbolicNames = symbolicNames || [];\n\treturn this;\n}\n\nDFASerializer.prototype.toString = function() {\n   if(this.dfa.s0 === null) {\n       return null;\n   }\n   var buf = \"\";\n   var states = this.dfa.sortedStates();\n   for(var i=0;i<states.length;i++) {\n       var s = states[i];\n       if(s.edges!==null) {\n            var n = s.edges.length;\n            for(var j=0;j<n;j++) {\n                var t = s.edges[j] || null;\n                if(t!==null && t.stateNumber !== 0x7FFFFFFF) {\n                    buf = buf.concat(this.getStateString(s));\n                    buf = buf.concat(\"-\");\n                    buf = buf.concat(this.getEdgeLabel(j));\n                    buf = buf.concat(\"->\");\n                    buf = buf.concat(this.getStateString(t));\n                    buf = buf.concat('\\n');\n                }\n            }\n       }\n   }\n   return buf.length===0 ? null : buf;\n};\n\nDFASerializer.prototype.getEdgeLabel = function(i) {\n    if (i===0) {\n        return \"EOF\";\n    } else if(this.literalNames !==null || this.symbolicNames!==null) {\n        return this.literalNames[i-1] || this.symbolicNames[i-1];\n    } else {\n        return String.fromCharCode(i-1);\n    }\n};\n\nDFASerializer.prototype.getStateString = function(s) {\n    var baseStateStr = ( s.isAcceptState ? \":\" : \"\") + \"s\" + s.stateNumber + ( s.requiresFullContext ? \"^\" : \"\");\n    if(s.isAcceptState) {\n        if (s.predicates !== null) {\n            return baseStateStr + \"=>\" + s.predicates.toString();\n        } else {\n            return baseStateStr + \"=>\" + s.prediction.toString();\n        }\n    } else {\n        return baseStateStr;\n    }\n};\n\nfunction LexerDFASerializer(dfa) {\n\tDFASerializer.call(this, dfa, null);\n\treturn this;\n}\n\nLexerDFASerializer.prototype = Object.create(DFASerializer.prototype);\nLexerDFASerializer.prototype.constructor = LexerDFASerializer;\n\nLexerDFASerializer.prototype.getEdgeLabel = function(i) {\n\treturn \"'\" + String.fromCharCode(i) + \"'\";\n};\n\nexports.DFASerializer = DFASerializer;\nexports.LexerDFASerializer = LexerDFASerializer;\n\n","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n///\n\nvar ATNConfigSet = require('./../atn/ATNConfigSet').ATNConfigSet;\nvar Utils = require('./../Utils');\nvar Hash = Utils.Hash;\nvar Set = Utils.Set;\n\n// Map a predicate to a predicted alternative.///\n\nfunction PredPrediction(pred, alt) {\n\tthis.alt = alt;\n\tthis.pred = pred;\n\treturn this;\n}\n\nPredPrediction.prototype.toString = function() {\n\treturn \"(\" + this.pred + \", \" + this.alt + \")\";\n};\n\n// A DFA state represents a set of possible ATN configurations.\n// As Aho, Sethi, Ullman p. 117 says \"The DFA uses its state\n// to keep track of all possible states the ATN can be in after\n// reading each input symbol. That is to say, after reading\n// input a1a2..an, the DFA is in a state that represents the\n// subset T of the states of the ATN that are reachable from the\n// ATN's start state along some path labeled a1a2..an.\"\n// In conventional NFA&rarr;DFA conversion, therefore, the subset T\n// would be a bitset representing the set of states the\n// ATN could be in. We need to track the alt predicted by each\n// state as well, however. More importantly, we need to maintain\n// a stack of states, tracking the closure operations as they\n// jump from rule to rule, emulating rule invocations (method calls).\n// I have to add a stack to simulate the proper lookahead sequences for\n// the underlying LL grammar from which the ATN was derived.\n//\n// <p>I use a set of ATNConfig objects not simple states. An ATNConfig\n// is both a state (ala normal conversion) and a RuleContext describing\n// the chain of rules (if any) followed to arrive at that state.</p>\n//\n// <p>A DFA state may have multiple references to a particular state,\n// but with different ATN contexts (with same or different alts)\n// meaning that state was reached via a different set of rule invocations.</p>\n// /\n\nfunction DFAState(stateNumber, configs) {\n\tif (stateNumber === null) {\n\t\tstateNumber = -1;\n\t}\n\tif (configs === null) {\n\t\tconfigs = new ATNConfigSet();\n\t}\n\tthis.stateNumber = stateNumber;\n\tthis.configs = configs;\n\t// {@code edges[symbol]} points to target of symbol. Shift up by 1 so (-1)\n\t// {@link Token//EOF} maps to {@code edges[0]}.\n\tthis.edges = null;\n\tthis.isAcceptState = false;\n\t// if accept state, what ttype do we match or alt do we predict?\n\t// This is set to {@link ATN//INVALID_ALT_NUMBER} when {@link\n\t// //predicates}{@code !=null} or\n\t// {@link //requiresFullContext}.\n\tthis.prediction = 0;\n\tthis.lexerActionExecutor = null;\n\t// Indicates that this state was created during SLL prediction that\n\t// discovered a conflict between the configurations in the state. Future\n\t// {@link ParserATNSimulator//execATN} invocations immediately jumped doing\n\t// full context prediction if this field is true.\n\tthis.requiresFullContext = false;\n\t// During SLL parsing, this is a list of predicates associated with the\n\t// ATN configurations of the DFA state. When we have predicates,\n\t// {@link //requiresFullContext} is {@code false} since full context\n\t// prediction evaluates predicates\n\t// on-the-fly. If this is not null, then {@link //prediction} is\n\t// {@link ATN//INVALID_ALT_NUMBER}.\n\t//\n\t// <p>We only use these for non-{@link //requiresFullContext} but\n\t// conflicting states. That\n\t// means we know from the context (it's $ or we don't dip into outer\n\t// context) that it's an ambiguity not a conflict.</p>\n\t//\n\t// <p>This list is computed by {@link\n\t// ParserATNSimulator//predicateDFAState}.</p>\n\tthis.predicates = null;\n\treturn this;\n}\n\n// Get the set of all alts mentioned by all ATN configurations in this\n// DFA state.\nDFAState.prototype.getAltSet = function() {\n\tvar alts = new Set();\n\tif (this.configs !== null) {\n\t\tfor (var i = 0; i < this.configs.length; i++) {\n\t\t\tvar c = this.configs[i];\n\t\t\talts.add(c.alt);\n\t\t}\n\t}\n\tif (alts.length === 0) {\n\t\treturn null;\n\t} else {\n\t\treturn alts;\n\t}\n};\n\n// Two {@link DFAState} instances are equal if their ATN configuration sets\n// are the same. This method is used to see if a state already exists.\n//\n// <p>Because the number of alternatives and number of ATN configurations are\n// finite, there is a finite number of DFA states that can be processed.\n// This is necessary to show that the algorithm terminates.</p>\n//\n// <p>Cannot test the DFA state numbers here because in\n// {@link ParserATNSimulator//addDFAState} we need to know if any other state\n// exists that has this exact set of ATN configurations. The\n// {@link //stateNumber} is irrelevant.</p>\nDFAState.prototype.equals = function(other) {\n\t// compare set of ATN configurations in this set with other\n\treturn this === other ||\n\t\t\t(other instanceof DFAState &&\n\t\t\t\tthis.configs.equals(other.configs));\n};\n\nDFAState.prototype.toString = function() {\n\tvar s = \"\" + this.stateNumber + \":\" + this.configs;\n\tif(this.isAcceptState) {\n        s = s + \"=>\";\n        if (this.predicates !== null)\n            s = s + this.predicates;\n        else\n            s = s + this.prediction;\n    }\n\treturn s;\n};\n\nDFAState.prototype.hashCode = function() {\n\tvar hash = new Hash();\n\thash.update(this.configs);\n    return hash.finish();\n};\n\nexports.DFAState = DFAState;\nexports.PredPrediction = PredPrediction;\n","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n\nexports.DFA = require('./DFA').DFA;\nexports.DFASerializer = require('./DFASerializer').DFASerializer;\nexports.LexerDFASerializer = require('./DFASerializer').LexerDFASerializer;\nexports.PredPrediction = require('./DFAState').PredPrediction;\n","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n//\n\n//\n// This implementation of {@link ANTLRErrorListener} can be used to identify\n// certain potential correctness and performance problems in grammars. \"Reports\"\n// are made by calling {@link Parser//notifyErrorListeners} with the appropriate\n// message.\n//\n// <ul>\n// <li><b>Ambiguities</b>: These are cases where more than one path through the\n// grammar can match the input.</li>\n// <li><b>Weak context sensitivity</b>: These are cases where full-context\n// prediction resolved an SLL conflict to a unique alternative which equaled the\n// minimum alternative of the SLL conflict.</li>\n// <li><b>Strong (forced) context sensitivity</b>: These are cases where the\n// full-context prediction resolved an SLL conflict to a unique alternative,\n// <em>and</em> the minimum alternative of the SLL conflict was found to not be\n// a truly viable alternative. Two-stage parsing cannot be used for inputs where\n// this situation occurs.</li>\n// </ul>\n\nvar BitSet = require('./../Utils').BitSet;\nvar ErrorListener = require('./ErrorListener').ErrorListener;\nvar Interval = require('./../IntervalSet').Interval;\n\nfunction DiagnosticErrorListener(exactOnly) {\n\tErrorListener.call(this);\n\texactOnly = exactOnly || true;\n\t// whether all ambiguities or only exact ambiguities are reported.\n\tthis.exactOnly = exactOnly;\n\treturn this;\n}\n\nDiagnosticErrorListener.prototype = Object.create(ErrorListener.prototype);\nDiagnosticErrorListener.prototype.constructor = DiagnosticErrorListener;\n\nDiagnosticErrorListener.prototype.reportAmbiguity = function(recognizer, dfa,\n\t\tstartIndex, stopIndex, exact, ambigAlts, configs) {\n\tif (this.exactOnly && !exact) {\n\t\treturn;\n\t}\n\tvar msg = \"reportAmbiguity d=\" +\n\t\t\tthis.getDecisionDescription(recognizer, dfa) +\n\t\t\t\": ambigAlts=\" +\n\t\t\tthis.getConflictingAlts(ambigAlts, configs) +\n\t\t\t\", input='\" +\n\t\t\trecognizer.getTokenStream().getText(new Interval(startIndex, stopIndex)) + \"'\";\n\trecognizer.notifyErrorListeners(msg);\n};\n\nDiagnosticErrorListener.prototype.reportAttemptingFullContext = function(\n\t\trecognizer, dfa, startIndex, stopIndex, conflictingAlts, configs) {\n\tvar msg = \"reportAttemptingFullContext d=\" +\n\t\t\tthis.getDecisionDescription(recognizer, dfa) +\n\t\t\t\", input='\" +\n\t\t\trecognizer.getTokenStream().getText(new Interval(startIndex, stopIndex)) + \"'\";\n\trecognizer.notifyErrorListeners(msg);\n};\n\nDiagnosticErrorListener.prototype.reportContextSensitivity = function(\n\t\trecognizer, dfa, startIndex, stopIndex, prediction, configs) {\n\tvar msg = \"reportContextSensitivity d=\" +\n\t\t\tthis.getDecisionDescription(recognizer, dfa) +\n\t\t\t\", input='\" +\n\t\t\trecognizer.getTokenStream().getText(new Interval(startIndex, stopIndex)) + \"'\";\n\trecognizer.notifyErrorListeners(msg);\n};\n\nDiagnosticErrorListener.prototype.getDecisionDescription = function(recognizer, dfa) {\n\tvar decision = dfa.decision;\n\tvar ruleIndex = dfa.atnStartState.ruleIndex;\n\n\tvar ruleNames = recognizer.ruleNames;\n\tif (ruleIndex < 0 || ruleIndex >= ruleNames.length) {\n\t\treturn \"\" + decision;\n\t}\n\tvar ruleName = ruleNames[ruleIndex] || null;\n\tif (ruleName === null || ruleName.length === 0) {\n\t\treturn \"\" + decision;\n\t}\n\treturn \"\" + decision + \" (\" + ruleName + \")\";\n};\n\n//\n// Computes the set of conflicting or ambiguous alternatives from a\n// configuration set, if that information was not already provided by the\n// parser.\n//\n// @param reportedAlts The set of conflicting or ambiguous alternatives, as\n// reported by the parser.\n// @param configs The conflicting or ambiguous configuration set.\n// @return Returns {@code reportedAlts} if it is not {@code null}, otherwise\n// returns the set of alternatives represented in {@code configs}.\n//\nDiagnosticErrorListener.prototype.getConflictingAlts = function(reportedAlts, configs) {\n\tif (reportedAlts !== null) {\n\t\treturn reportedAlts;\n\t}\n\tvar result = new BitSet();\n\tfor (var i = 0; i < configs.items.length; i++) {\n\t\tresult.add(configs.items[i].alt);\n\t}\n\treturn \"{\" + result.values().join(\", \") + \"}\";\n};\n\nexports.DiagnosticErrorListener = DiagnosticErrorListener;","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n\n// Provides an empty default implementation of {@link ANTLRErrorListener}. The\n// default implementation of each method does nothing, but can be overridden as\n// necessary.\n\nfunction ErrorListener() {\n\treturn this;\n}\n\nErrorListener.prototype.syntaxError = function(recognizer, offendingSymbol, line, column, msg, e) {\n};\n\nErrorListener.prototype.reportAmbiguity = function(recognizer, dfa, startIndex, stopIndex, exact, ambigAlts, configs) {\n};\n\nErrorListener.prototype.reportAttemptingFullContext = function(recognizer, dfa, startIndex, stopIndex, conflictingAlts, configs) {\n};\n\nErrorListener.prototype.reportContextSensitivity = function(recognizer, dfa, startIndex, stopIndex, prediction, configs) {\n};\n\nfunction ConsoleErrorListener() {\n\tErrorListener.call(this);\n\treturn this;\n}\n\nConsoleErrorListener.prototype = Object.create(ErrorListener.prototype);\nConsoleErrorListener.prototype.constructor = ConsoleErrorListener;\n\n//\n// Provides a default instance of {@link ConsoleErrorListener}.\n//\nConsoleErrorListener.INSTANCE = new ConsoleErrorListener();\n\n//\n// {@inheritDoc}\n//\n// <p>\n// This implementation prints messages to {@link System//err} containing the\n// values of {@code line}, {@code charPositionInLine}, and {@code msg} using\n// the following format.</p>\n//\n// <pre>\n// line <em>line</em>:<em>charPositionInLine</em> <em>msg</em>\n// </pre>\n//\nConsoleErrorListener.prototype.syntaxError = function(recognizer, offendingSymbol, line, column, msg, e) {\n    console.error(\"line \" + line + \":\" + column + \" \" + msg);\n};\n\nfunction ProxyErrorListener(delegates) {\n\tErrorListener.call(this);\n    if (delegates===null) {\n        throw \"delegates\";\n    }\n    this.delegates = delegates;\n\treturn this;\n}\n\nProxyErrorListener.prototype = Object.create(ErrorListener.prototype);\nProxyErrorListener.prototype.constructor = ProxyErrorListener;\n\nProxyErrorListener.prototype.syntaxError = function(recognizer, offendingSymbol, line, column, msg, e) {\n    this.delegates.map(function(d) { d.syntaxError(recognizer, offendingSymbol, line, column, msg, e); });\n};\n\nProxyErrorListener.prototype.reportAmbiguity = function(recognizer, dfa, startIndex, stopIndex, exact, ambigAlts, configs) {\n    this.delegates.map(function(d) { d.reportAmbiguity(recognizer, dfa, startIndex, stopIndex, exact, ambigAlts, configs); });\n};\n\nProxyErrorListener.prototype.reportAttemptingFullContext = function(recognizer, dfa, startIndex, stopIndex, conflictingAlts, configs) {\n\tthis.delegates.map(function(d) { d.reportAttemptingFullContext(recognizer, dfa, startIndex, stopIndex, conflictingAlts, configs); });\n};\n\nProxyErrorListener.prototype.reportContextSensitivity = function(recognizer, dfa, startIndex, stopIndex, prediction, configs) {\n\tthis.delegates.map(function(d) { d.reportContextSensitivity(recognizer, dfa, startIndex, stopIndex, prediction, configs); });\n};\n\nexports.ErrorListener = ErrorListener;\nexports.ConsoleErrorListener = ConsoleErrorListener;\nexports.ProxyErrorListener = ProxyErrorListener;\n\n","//\n/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n//\n\nvar Token = require('./../Token').Token;\nvar Errors = require('./Errors');\nvar NoViableAltException = Errors.NoViableAltException;\nvar InputMismatchException = Errors.InputMismatchException;\nvar FailedPredicateException = Errors.FailedPredicateException;\nvar ParseCancellationException = Errors.ParseCancellationException;\nvar ATNState = require('./../atn/ATNState').ATNState;\nvar Interval = require('./../IntervalSet').Interval;\nvar IntervalSet = require('./../IntervalSet').IntervalSet;\n\nfunction ErrorStrategy() {\n\n}\n\nErrorStrategy.prototype.reset = function(recognizer){\n};\n\nErrorStrategy.prototype.recoverInline = function(recognizer){\n};\n\nErrorStrategy.prototype.recover = function(recognizer, e){\n};\n\nErrorStrategy.prototype.sync = function(recognizer){\n};\n\nErrorStrategy.prototype.inErrorRecoveryMode = function(recognizer){\n};\n\nErrorStrategy.prototype.reportError = function(recognizer){\n};\n\n\n\n// This is the default implementation of {@link ANTLRErrorStrategy} used for\n// error reporting and recovery in ANTLR parsers.\n//\nfunction DefaultErrorStrategy() {\n\tErrorStrategy.call(this);\n    // Indicates whether the error strategy is currently \"recovering from an\n    // error\". This is used to suppress reporting multiple error messages while\n    // attempting to recover from a detected syntax error.\n    //\n    // @see //inErrorRecoveryMode\n    //\n    this.errorRecoveryMode = false;\n\n    // The index into the input stream where the last error occurred.\n    // This is used to prevent infinite loops where an error is found\n    // but no token is consumed during recovery...another error is found,\n    // ad nauseum. This is a failsafe mechanism to guarantee that at least\n    // one token/tree node is consumed for two errors.\n    //\n    this.lastErrorIndex = -1;\n    this.lastErrorStates = null;\n    return this;\n}\n\nDefaultErrorStrategy.prototype = Object.create(ErrorStrategy.prototype);\nDefaultErrorStrategy.prototype.constructor = DefaultErrorStrategy;\n\n// <p>The default implementation simply calls {@link //endErrorCondition} to\n// ensure that the handler is not in error recovery mode.</p>\nDefaultErrorStrategy.prototype.reset = function(recognizer) {\n    this.endErrorCondition(recognizer);\n};\n\n//\n// This method is called to enter error recovery mode when a recognition\n// exception is reported.\n//\n// @param recognizer the parser instance\n//\nDefaultErrorStrategy.prototype.beginErrorCondition = function(recognizer) {\n    this.errorRecoveryMode = true;\n};\n\nDefaultErrorStrategy.prototype.inErrorRecoveryMode = function(recognizer) {\n    return this.errorRecoveryMode;\n};\n\n//\n// This method is called to leave error recovery mode after recovering from\n// a recognition exception.\n//\n// @param recognizer\n//\nDefaultErrorStrategy.prototype.endErrorCondition = function(recognizer) {\n    this.errorRecoveryMode = false;\n    this.lastErrorStates = null;\n    this.lastErrorIndex = -1;\n};\n\n//\n// {@inheritDoc}\n//\n// <p>The default implementation simply calls {@link //endErrorCondition}.</p>\n//\nDefaultErrorStrategy.prototype.reportMatch = function(recognizer) {\n    this.endErrorCondition(recognizer);\n};\n\n//\n// {@inheritDoc}\n//\n// <p>The default implementation returns immediately if the handler is already\n// in error recovery mode. Otherwise, it calls {@link //beginErrorCondition}\n// and dispatches the reporting task based on the runtime type of {@code e}\n// according to the following table.</p>\n//\n// <ul>\n// <li>{@link NoViableAltException}: Dispatches the call to\n// {@link //reportNoViableAlternative}</li>\n// <li>{@link InputMismatchException}: Dispatches the call to\n// {@link //reportInputMismatch}</li>\n// <li>{@link FailedPredicateException}: Dispatches the call to\n// {@link //reportFailedPredicate}</li>\n// <li>All other types: calls {@link Parser//notifyErrorListeners} to report\n// the exception</li>\n// </ul>\n//\nDefaultErrorStrategy.prototype.reportError = function(recognizer, e) {\n   // if we've already reported an error and have not matched a token\n   // yet successfully, don't report any errors.\n    if(this.inErrorRecoveryMode(recognizer)) {\n        return; // don't report spurious errors\n    }\n    this.beginErrorCondition(recognizer);\n    if ( e instanceof NoViableAltException ) {\n        this.reportNoViableAlternative(recognizer, e);\n    } else if ( e instanceof InputMismatchException ) {\n        this.reportInputMismatch(recognizer, e);\n    } else if ( e instanceof FailedPredicateException ) {\n        this.reportFailedPredicate(recognizer, e);\n    } else {\n        console.log(\"unknown recognition error type: \" + e.constructor.name);\n        console.log(e.stack);\n        recognizer.notifyErrorListeners(e.getOffendingToken(), e.getMessage(), e);\n    }\n};\n//\n// {@inheritDoc}\n//\n// <p>The default implementation resynchronizes the parser by consuming tokens\n// until we find one in the resynchronization set--loosely the set of tokens\n// that can follow the current rule.</p>\n//\nDefaultErrorStrategy.prototype.recover = function(recognizer, e) {\n    if (this.lastErrorIndex===recognizer.getInputStream().index &&\n        this.lastErrorStates !== null && this.lastErrorStates.indexOf(recognizer.state)>=0) {\n\t\t// uh oh, another error at same token index and previously-visited\n\t\t// state in ATN; must be a case where LT(1) is in the recovery\n\t\t// token set so nothing got consumed. Consume a single token\n\t\t// at least to prevent an infinite loop; this is a failsafe.\n\t\trecognizer.consume();\n    }\n    this.lastErrorIndex = recognizer._input.index;\n    if (this.lastErrorStates === null) {\n        this.lastErrorStates = [];\n    }\n    this.lastErrorStates.push(recognizer.state);\n    var followSet = this.getErrorRecoverySet(recognizer);\n    this.consumeUntil(recognizer, followSet);\n};\n\n// The default implementation of {@link ANTLRErrorStrategy//sync} makes sure\n// that the current lookahead symbol is consistent with what were expecting\n// at this point in the ATN. You can call this anytime but ANTLR only\n// generates code to check before subrules/loops and each iteration.\n//\n// <p>Implements Jim Idle's magic sync mechanism in closures and optional\n// subrules. E.g.,</p>\n//\n// <pre>\n// a : sync ( stuff sync )* ;\n// sync : {consume to what can follow sync} ;\n// </pre>\n//\n// At the start of a sub rule upon error, {@link //sync} performs single\n// token deletion, if possible. If it can't do that, it bails on the current\n// rule and uses the default error recovery, which consumes until the\n// resynchronization set of the current rule.\n//\n// <p>If the sub rule is optional ({@code (...)?}, {@code (...)*}, or block\n// with an empty alternative), then the expected set includes what follows\n// the subrule.</p>\n//\n// <p>During loop iteration, it consumes until it sees a token that can start a\n// sub rule or what follows loop. Yes, that is pretty aggressive. We opt to\n// stay in the loop as long as possible.</p>\n//\n// <p><strong>ORIGINS</strong></p>\n//\n// <p>Previous versions of ANTLR did a poor job of their recovery within loops.\n// A single mismatch token or missing token would force the parser to bail\n// out of the entire rules surrounding the loop. So, for rule</p>\n//\n// <pre>\n// classDef : 'class' ID '{' member* '}'\n// </pre>\n//\n// input with an extra token between members would force the parser to\n// consume until it found the next class definition rather than the next\n// member definition of the current class.\n//\n// <p>This functionality cost a little bit of effort because the parser has to\n// compare token set at the start of the loop and at each iteration. If for\n// some reason speed is suffering for you, you can turn off this\n// functionality by simply overriding this method as a blank { }.</p>\n//\nDefaultErrorStrategy.prototype.sync = function(recognizer) {\n    // If already recovering, don't try to sync\n    if (this.inErrorRecoveryMode(recognizer)) {\n        return;\n    }\n    var s = recognizer._interp.atn.states[recognizer.state];\n    var la = recognizer.getTokenStream().LA(1);\n    // try cheaper subset first; might get lucky. seems to shave a wee bit off\n    var nextTokens = recognizer.atn.nextTokens(s);\n    if (nextTokens.contains(Token.EPSILON) || nextTokens.contains(la)) {\n        return;\n    }\n    switch (s.stateType) {\n    case ATNState.BLOCK_START:\n    case ATNState.STAR_BLOCK_START:\n    case ATNState.PLUS_BLOCK_START:\n    case ATNState.STAR_LOOP_ENTRY:\n       // report error and recover if possible\n        if( this.singleTokenDeletion(recognizer) !== null) {\n            return;\n        } else {\n            throw new InputMismatchException(recognizer);\n        }\n        break;\n    case ATNState.PLUS_LOOP_BACK:\n    case ATNState.STAR_LOOP_BACK:\n        this.reportUnwantedToken(recognizer);\n        var expecting = new IntervalSet();\n        expecting.addSet(recognizer.getExpectedTokens());\n        var whatFollowsLoopIterationOrRule = expecting.addSet(this.getErrorRecoverySet(recognizer));\n        this.consumeUntil(recognizer, whatFollowsLoopIterationOrRule);\n        break;\n    default:\n        // do nothing if we can't identify the exact kind of ATN state\n    }\n};\n\n// This is called by {@link //reportError} when the exception is a\n// {@link NoViableAltException}.\n//\n// @see //reportError\n//\n// @param recognizer the parser instance\n// @param e the recognition exception\n//\nDefaultErrorStrategy.prototype.reportNoViableAlternative = function(recognizer, e) {\n    var tokens = recognizer.getTokenStream();\n    var input;\n    if(tokens !== null) {\n        if (e.startToken.type===Token.EOF) {\n            input = \"<EOF>\";\n        } else {\n            input = tokens.getText(new Interval(e.startToken.tokenIndex, e.offendingToken.tokenIndex));\n        }\n    } else {\n        input = \"<unknown input>\";\n    }\n    var msg = \"no viable alternative at input \" + this.escapeWSAndQuote(input);\n    recognizer.notifyErrorListeners(msg, e.offendingToken, e);\n};\n\n//\n// This is called by {@link //reportError} when the exception is an\n// {@link InputMismatchException}.\n//\n// @see //reportError\n//\n// @param recognizer the parser instance\n// @param e the recognition exception\n//\nDefaultErrorStrategy.prototype.reportInputMismatch = function(recognizer, e) {\n    var msg = \"mismatched input \" + this.getTokenErrorDisplay(e.offendingToken) +\n          \" expecting \" + e.getExpectedTokens().toString(recognizer.literalNames, recognizer.symbolicNames);\n    recognizer.notifyErrorListeners(msg, e.offendingToken, e);\n};\n\n//\n// This is called by {@link //reportError} when the exception is a\n// {@link FailedPredicateException}.\n//\n// @see //reportError\n//\n// @param recognizer the parser instance\n// @param e the recognition exception\n//\nDefaultErrorStrategy.prototype.reportFailedPredicate = function(recognizer, e) {\n    var ruleName = recognizer.ruleNames[recognizer._ctx.ruleIndex];\n    var msg = \"rule \" + ruleName + \" \" + e.message;\n    recognizer.notifyErrorListeners(msg, e.offendingToken, e);\n};\n\n// This method is called to report a syntax error which requires the removal\n// of a token from the input stream. At the time this method is called, the\n// erroneous symbol is current {@code LT(1)} symbol and has not yet been\n// removed from the input stream. When this method returns,\n// {@code recognizer} is in error recovery mode.\n//\n// <p>This method is called when {@link //singleTokenDeletion} identifies\n// single-token deletion as a viable recovery strategy for a mismatched\n// input error.</p>\n//\n// <p>The default implementation simply returns if the handler is already in\n// error recovery mode. Otherwise, it calls {@link //beginErrorCondition} to\n// enter error recovery mode, followed by calling\n// {@link Parser//notifyErrorListeners}.</p>\n//\n// @param recognizer the parser instance\n//\nDefaultErrorStrategy.prototype.reportUnwantedToken = function(recognizer) {\n    if (this.inErrorRecoveryMode(recognizer)) {\n        return;\n    }\n    this.beginErrorCondition(recognizer);\n    var t = recognizer.getCurrentToken();\n    var tokenName = this.getTokenErrorDisplay(t);\n    var expecting = this.getExpectedTokens(recognizer);\n    var msg = \"extraneous input \" + tokenName + \" expecting \" +\n        expecting.toString(recognizer.literalNames, recognizer.symbolicNames);\n    recognizer.notifyErrorListeners(msg, t, null);\n};\n// This method is called to report a syntax error which requires the\n// insertion of a missing token into the input stream. At the time this\n// method is called, the missing token has not yet been inserted. When this\n// method returns, {@code recognizer} is in error recovery mode.\n//\n// <p>This method is called when {@link //singleTokenInsertion} identifies\n// single-token insertion as a viable recovery strategy for a mismatched\n// input error.</p>\n//\n// <p>The default implementation simply returns if the handler is already in\n// error recovery mode. Otherwise, it calls {@link //beginErrorCondition} to\n// enter error recovery mode, followed by calling\n// {@link Parser//notifyErrorListeners}.</p>\n//\n// @param recognizer the parser instance\n//\nDefaultErrorStrategy.prototype.reportMissingToken = function(recognizer) {\n    if ( this.inErrorRecoveryMode(recognizer)) {\n        return;\n    }\n    this.beginErrorCondition(recognizer);\n    var t = recognizer.getCurrentToken();\n    var expecting = this.getExpectedTokens(recognizer);\n    var msg = \"missing \" + expecting.toString(recognizer.literalNames, recognizer.symbolicNames) +\n          \" at \" + this.getTokenErrorDisplay(t);\n    recognizer.notifyErrorListeners(msg, t, null);\n};\n\n// <p>The default implementation attempts to recover from the mismatched input\n// by using single token insertion and deletion as described below. If the\n// recovery attempt fails, this method throws an\n// {@link InputMismatchException}.</p>\n//\n// <p><strong>EXTRA TOKEN</strong> (single token deletion)</p>\n//\n// <p>{@code LA(1)} is not what we are looking for. If {@code LA(2)} has the\n// right token, however, then assume {@code LA(1)} is some extra spurious\n// token and delete it. Then consume and return the next token (which was\n// the {@code LA(2)} token) as the successful result of the match operation.</p>\n//\n// <p>This recovery strategy is implemented by {@link\n// //singleTokenDeletion}.</p>\n//\n// <p><strong>MISSING TOKEN</strong> (single token insertion)</p>\n//\n// <p>If current token (at {@code LA(1)}) is consistent with what could come\n// after the expected {@code LA(1)} token, then assume the token is missing\n// and use the parser's {@link TokenFactory} to create it on the fly. The\n// \"insertion\" is performed by returning the created token as the successful\n// result of the match operation.</p>\n//\n// <p>This recovery strategy is implemented by {@link\n// //singleTokenInsertion}.</p>\n//\n// <p><strong>EXAMPLE</strong></p>\n//\n// <p>For example, Input {@code i=(3;} is clearly missing the {@code ')'}. When\n// the parser returns from the nested call to {@code expr}, it will have\n// call chain:</p>\n//\n// <pre>\n// stat &rarr; expr &rarr; atom\n// </pre>\n//\n// and it will be trying to match the {@code ')'} at this point in the\n// derivation:\n//\n// <pre>\n// =&gt; ID '=' '(' INT ')' ('+' atom)* ';'\n// ^\n// </pre>\n//\n// The attempt to match {@code ')'} will fail when it sees {@code ';'} and\n// call {@link //recoverInline}. To recover, it sees that {@code LA(1)==';'}\n// is in the set of tokens that can follow the {@code ')'} token reference\n// in rule {@code atom}. It can assume that you forgot the {@code ')'}.\n//\nDefaultErrorStrategy.prototype.recoverInline = function(recognizer) {\n    // SINGLE TOKEN DELETION\n    var matchedSymbol = this.singleTokenDeletion(recognizer);\n    if (matchedSymbol !== null) {\n        // we have deleted the extra token.\n        // now, move past ttype token as if all were ok\n        recognizer.consume();\n        return matchedSymbol;\n    }\n    // SINGLE TOKEN INSERTION\n    if (this.singleTokenInsertion(recognizer)) {\n        return this.getMissingSymbol(recognizer);\n    }\n    // even that didn't work; must throw the exception\n    throw new InputMismatchException(recognizer);\n};\n\n//\n// This method implements the single-token insertion inline error recovery\n// strategy. It is called by {@link //recoverInline} if the single-token\n// deletion strategy fails to recover from the mismatched input. If this\n// method returns {@code true}, {@code recognizer} will be in error recovery\n// mode.\n//\n// <p>This method determines whether or not single-token insertion is viable by\n// checking if the {@code LA(1)} input symbol could be successfully matched\n// if it were instead the {@code LA(2)} symbol. If this method returns\n// {@code true}, the caller is responsible for creating and inserting a\n// token with the correct type to produce this behavior.</p>\n//\n// @param recognizer the parser instance\n// @return {@code true} if single-token insertion is a viable recovery\n// strategy for the current mismatched input, otherwise {@code false}\n//\nDefaultErrorStrategy.prototype.singleTokenInsertion = function(recognizer) {\n    var currentSymbolType = recognizer.getTokenStream().LA(1);\n    // if current token is consistent with what could come after current\n    // ATN state, then we know we're missing a token; error recovery\n    // is free to conjure up and insert the missing token\n    var atn = recognizer._interp.atn;\n    var currentState = atn.states[recognizer.state];\n    var next = currentState.transitions[0].target;\n    var expectingAtLL2 = atn.nextTokens(next, recognizer._ctx);\n    if (expectingAtLL2.contains(currentSymbolType) ){\n        this.reportMissingToken(recognizer);\n        return true;\n    } else {\n        return false;\n    }\n};\n\n// This method implements the single-token deletion inline error recovery\n// strategy. It is called by {@link //recoverInline} to attempt to recover\n// from mismatched input. If this method returns null, the parser and error\n// handler state will not have changed. If this method returns non-null,\n// {@code recognizer} will <em>not</em> be in error recovery mode since the\n// returned token was a successful match.\n//\n// <p>If the single-token deletion is successful, this method calls\n// {@link //reportUnwantedToken} to report the error, followed by\n// {@link Parser//consume} to actually \"delete\" the extraneous token. Then,\n// before returning {@link //reportMatch} is called to signal a successful\n// match.</p>\n//\n// @param recognizer the parser instance\n// @return the successfully matched {@link Token} instance if single-token\n// deletion successfully recovers from the mismatched input, otherwise\n// {@code null}\n//\nDefaultErrorStrategy.prototype.singleTokenDeletion = function(recognizer) {\n    var nextTokenType = recognizer.getTokenStream().LA(2);\n    var expecting = this.getExpectedTokens(recognizer);\n    if (expecting.contains(nextTokenType)) {\n        this.reportUnwantedToken(recognizer);\n        // print(\"recoverFromMismatchedToken deleting \" \\\n        // + str(recognizer.getTokenStream().LT(1)) \\\n        // + \" since \" + str(recognizer.getTokenStream().LT(2)) \\\n        // + \" is what we want\", file=sys.stderr)\n        recognizer.consume(); // simply delete extra token\n        // we want to return the token we're actually matching\n        var matchedSymbol = recognizer.getCurrentToken();\n        this.reportMatch(recognizer); // we know current token is correct\n        return matchedSymbol;\n    } else {\n        return null;\n    }\n};\n\n// Conjure up a missing token during error recovery.\n//\n// The recognizer attempts to recover from single missing\n// symbols. But, actions might refer to that missing symbol.\n// For example, x=ID {f($x);}. The action clearly assumes\n// that there has been an identifier matched previously and that\n// $x points at that token. If that token is missing, but\n// the next token in the stream is what we want we assume that\n// this token is missing and we keep going. Because we\n// have to return some token to replace the missing token,\n// we have to conjure one up. This method gives the user control\n// over the tokens returned for missing tokens. Mostly,\n// you will want to create something special for identifier\n// tokens. For literals such as '{' and ',', the default\n// action in the parser or tree parser works. It simply creates\n// a CommonToken of the appropriate type. The text will be the token.\n// If you change what tokens must be created by the lexer,\n// override this method to create the appropriate tokens.\n//\nDefaultErrorStrategy.prototype.getMissingSymbol = function(recognizer) {\n    var currentSymbol = recognizer.getCurrentToken();\n    var expecting = this.getExpectedTokens(recognizer);\n    var expectedTokenType = expecting.first(); // get any element\n    var tokenText;\n    if (expectedTokenType===Token.EOF) {\n        tokenText = \"<missing EOF>\";\n    } else {\n        tokenText = \"<missing \" + recognizer.literalNames[expectedTokenType] + \">\";\n    }\n    var current = currentSymbol;\n    var lookback = recognizer.getTokenStream().LT(-1);\n    if (current.type===Token.EOF && lookback !== null) {\n        current = lookback;\n    }\n    return recognizer.getTokenFactory().create(current.source,\n        expectedTokenType, tokenText, Token.DEFAULT_CHANNEL,\n        -1, -1, current.line, current.column);\n};\n\nDefaultErrorStrategy.prototype.getExpectedTokens = function(recognizer) {\n    return recognizer.getExpectedTokens();\n};\n\n// How should a token be displayed in an error message? The default\n// is to display just the text, but during development you might\n// want to have a lot of information spit out. Override in that case\n// to use t.toString() (which, for CommonToken, dumps everything about\n// the token). This is better than forcing you to override a method in\n// your token objects because you don't have to go modify your lexer\n// so that it creates a new Java type.\n//\nDefaultErrorStrategy.prototype.getTokenErrorDisplay = function(t) {\n    if (t === null) {\n        return \"<no token>\";\n    }\n    var s = t.text;\n    if (s === null) {\n        if (t.type===Token.EOF) {\n            s = \"<EOF>\";\n        } else {\n            s = \"<\" + t.type + \">\";\n        }\n    }\n    return this.escapeWSAndQuote(s);\n};\n\nDefaultErrorStrategy.prototype.escapeWSAndQuote = function(s) {\n    s = s.replace(/\\n/g,\"\\\\n\");\n    s = s.replace(/\\r/g,\"\\\\r\");\n    s = s.replace(/\\t/g,\"\\\\t\");\n    return \"'\" + s + \"'\";\n};\n\n// Compute the error recovery set for the current rule. During\n// rule invocation, the parser pushes the set of tokens that can\n// follow that rule reference on the stack; this amounts to\n// computing FIRST of what follows the rule reference in the\n// enclosing rule. See LinearApproximator.FIRST().\n// This local follow set only includes tokens\n// from within the rule; i.e., the FIRST computation done by\n// ANTLR stops at the end of a rule.\n//\n// EXAMPLE\n//\n// When you find a \"no viable alt exception\", the input is not\n// consistent with any of the alternatives for rule r. The best\n// thing to do is to consume tokens until you see something that\n// can legally follow a call to r//or* any rule that called r.\n// You don't want the exact set of viable next tokens because the\n// input might just be missing a token--you might consume the\n// rest of the input looking for one of the missing tokens.\n//\n// Consider grammar:\n//\n// a : '[' b ']'\n// | '(' b ')'\n// ;\n// b : c '^' INT ;\n// c : ID\n// | INT\n// ;\n//\n// At each rule invocation, the set of tokens that could follow\n// that rule is pushed on a stack. Here are the various\n// context-sensitive follow sets:\n//\n// FOLLOW(b1_in_a) = FIRST(']') = ']'\n// FOLLOW(b2_in_a) = FIRST(')') = ')'\n// FOLLOW(c_in_b) = FIRST('^') = '^'\n//\n// Upon erroneous input \"[]\", the call chain is\n//\n// a -> b -> c\n//\n// and, hence, the follow context stack is:\n//\n// depth follow set start of rule execution\n// 0 <EOF> a (from main())\n// 1 ']' b\n// 2 '^' c\n//\n// Notice that ')' is not included, because b would have to have\n// been called from a different context in rule a for ')' to be\n// included.\n//\n// For error recovery, we cannot consider FOLLOW(c)\n// (context-sensitive or otherwise). We need the combined set of\n// all context-sensitive FOLLOW sets--the set of all tokens that\n// could follow any reference in the call chain. We need to\n// resync to one of those tokens. Note that FOLLOW(c)='^' and if\n// we resync'd to that token, we'd consume until EOF. We need to\n// sync to context-sensitive FOLLOWs for a, b, and c: {']','^'}.\n// In this case, for input \"[]\", LA(1) is ']' and in the set, so we would\n// not consume anything. After printing an error, rule c would\n// return normally. Rule b would not find the required '^' though.\n// At this point, it gets a mismatched token error and throws an\n// exception (since LA(1) is not in the viable following token\n// set). The rule exception handler tries to recover, but finds\n// the same recovery set and doesn't consume anything. Rule b\n// exits normally returning to rule a. Now it finds the ']' (and\n// with the successful match exits errorRecovery mode).\n//\n// So, you can see that the parser walks up the call chain looking\n// for the token that was a member of the recovery set.\n//\n// Errors are not generated in errorRecovery mode.\n//\n// ANTLR's error recovery mechanism is based upon original ideas:\n//\n// \"Algorithms + Data Structures = Programs\" by Niklaus Wirth\n//\n// and\n//\n// \"A note on error recovery in recursive descent parsers\":\n// http://portal.acm.org/citation.cfm?id=947902.947905\n//\n// Later, Josef Grosch had some good ideas:\n//\n// \"Efficient and Comfortable Error Recovery in Recursive Descent\n// Parsers\":\n// ftp://www.cocolab.com/products/cocktail/doca4.ps/ell.ps.zip\n//\n// Like Grosch I implement context-sensitive FOLLOW sets that are combined\n// at run-time upon error to avoid overhead during parsing.\n//\nDefaultErrorStrategy.prototype.getErrorRecoverySet = function(recognizer) {\n    var atn = recognizer._interp.atn;\n    var ctx = recognizer._ctx;\n    var recoverSet = new IntervalSet();\n    while (ctx !== null && ctx.invokingState>=0) {\n        // compute what follows who invoked us\n        var invokingState = atn.states[ctx.invokingState];\n        var rt = invokingState.transitions[0];\n        var follow = atn.nextTokens(rt.followState);\n        recoverSet.addSet(follow);\n        ctx = ctx.parentCtx;\n    }\n    recoverSet.removeOne(Token.EPSILON);\n    return recoverSet;\n};\n\n// Consume tokens until one matches the given token set.//\nDefaultErrorStrategy.prototype.consumeUntil = function(recognizer, set) {\n    var ttype = recognizer.getTokenStream().LA(1);\n    while( ttype !== Token.EOF && !set.contains(ttype)) {\n        recognizer.consume();\n        ttype = recognizer.getTokenStream().LA(1);\n    }\n};\n\n//\n// This implementation of {@link ANTLRErrorStrategy} responds to syntax errors\n// by immediately canceling the parse operation with a\n// {@link ParseCancellationException}. The implementation ensures that the\n// {@link ParserRuleContext//exception} field is set for all parse tree nodes\n// that were not completed prior to encountering the error.\n//\n// <p>\n// This error strategy is useful in the following scenarios.</p>\n//\n// <ul>\n// <li><strong>Two-stage parsing:</strong> This error strategy allows the first\n// stage of two-stage parsing to immediately terminate if an error is\n// encountered, and immediately fall back to the second stage. In addition to\n// avoiding wasted work by attempting to recover from errors here, the empty\n// implementation of {@link BailErrorStrategy//sync} improves the performance of\n// the first stage.</li>\n// <li><strong>Silent validation:</strong> When syntax errors are not being\n// reported or logged, and the parse result is simply ignored if errors occur,\n// the {@link BailErrorStrategy} avoids wasting work on recovering from errors\n// when the result will be ignored either way.</li>\n// </ul>\n//\n// <p>\n// {@code myparser.setErrorHandler(new BailErrorStrategy());}</p>\n//\n// @see Parser//setErrorHandler(ANTLRErrorStrategy)\n//\nfunction BailErrorStrategy() {\n\tDefaultErrorStrategy.call(this);\n\treturn this;\n}\n\nBailErrorStrategy.prototype = Object.create(DefaultErrorStrategy.prototype);\nBailErrorStrategy.prototype.constructor = BailErrorStrategy;\n\n// Instead of recovering from exception {@code e}, re-throw it wrapped\n// in a {@link ParseCancellationException} so it is not caught by the\n// rule function catches. Use {@link Exception//getCause()} to get the\n// original {@link RecognitionException}.\n//\nBailErrorStrategy.prototype.recover = function(recognizer, e) {\n    var context = recognizer._ctx;\n    while (context !== null) {\n        context.exception = e;\n        context = context.parentCtx;\n    }\n    throw new ParseCancellationException(e);\n};\n\n// Make sure we don't attempt to recover inline; if the parser\n// successfully recovers, it won't throw an exception.\n//\nBailErrorStrategy.prototype.recoverInline = function(recognizer) {\n    this.recover(recognizer, new InputMismatchException(recognizer));\n};\n\n// Make sure we don't attempt to recover from problems in subrules.//\nBailErrorStrategy.prototype.sync = function(recognizer) {\n    // pass\n};\n\nexports.BailErrorStrategy = BailErrorStrategy;\nexports.DefaultErrorStrategy = DefaultErrorStrategy;\n","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n\n// The root of the ANTLR exception hierarchy. In general, ANTLR tracks just\n//  3 kinds of errors: prediction errors, failed predicate errors, and\n//  mismatched input errors. In each case, the parser knows where it is\n//  in the input, where it is in the ATN, the rule invocation stack,\n//  and what kind of problem occurred.\n\nvar PredicateTransition = require('./../atn/Transition').PredicateTransition;\n\nfunction RecognitionException(params) {\n\tError.call(this);\n\tif (!!Error.captureStackTrace) {\n        Error.captureStackTrace(this, RecognitionException);\n\t} else {\n\t\tvar stack = new Error().stack;\n\t}\n\tthis.message = params.message;\n    this.recognizer = params.recognizer;\n    this.input = params.input;\n    this.ctx = params.ctx;\n    // The current {@link Token} when an error occurred. Since not all streams\n    // support accessing symbols by index, we have to track the {@link Token}\n    // instance itself.\n    this.offendingToken = null;\n    // Get the ATN state number the parser was in at the time the error\n    // occurred. For {@link NoViableAltException} and\n    // {@link LexerNoViableAltException} exceptions, this is the\n    // {@link DecisionState} number. For others, it is the state whose outgoing\n    // edge we couldn't match.\n    this.offendingState = -1;\n    if (this.recognizer!==null) {\n        this.offendingState = this.recognizer.state;\n    }\n    return this;\n}\n\nRecognitionException.prototype = Object.create(Error.prototype);\nRecognitionException.prototype.constructor = RecognitionException;\n\n// <p>If the state number is not known, this method returns -1.</p>\n\n//\n// Gets the set of input symbols which could potentially follow the\n// previously matched symbol at the time this exception was thrown.\n//\n// <p>If the set of expected tokens is not known and could not be computed,\n// this method returns {@code null}.</p>\n//\n// @return The set of token types that could potentially follow the current\n// state in the ATN, or {@code null} if the information is not available.\n// /\nRecognitionException.prototype.getExpectedTokens = function() {\n    if (this.recognizer!==null) {\n        return this.recognizer.atn.getExpectedTokens(this.offendingState, this.ctx);\n    } else {\n        return null;\n    }\n};\n\nRecognitionException.prototype.toString = function() {\n    return this.message;\n};\n\nfunction LexerNoViableAltException(lexer, input, startIndex, deadEndConfigs) {\n\tRecognitionException.call(this, {message:\"\", recognizer:lexer, input:input, ctx:null});\n    this.startIndex = startIndex;\n    this.deadEndConfigs = deadEndConfigs;\n    return this;\n}\n\nLexerNoViableAltException.prototype = Object.create(RecognitionException.prototype);\nLexerNoViableAltException.prototype.constructor = LexerNoViableAltException;\n\nLexerNoViableAltException.prototype.toString = function() {\n    var symbol = \"\";\n    if (this.startIndex >= 0 && this.startIndex < this.input.size) {\n        symbol = this.input.getText((this.startIndex,this.startIndex));\n    }\n    return \"LexerNoViableAltException\" + symbol;\n};\n\n// Indicates that the parser could not decide which of two or more paths\n// to take based upon the remaining input. It tracks the starting token\n// of the offending input and also knows where the parser was\n// in the various paths when the error. Reported by reportNoViableAlternative()\n//\nfunction NoViableAltException(recognizer, input, startToken, offendingToken, deadEndConfigs, ctx) {\n\tctx = ctx || recognizer._ctx;\n\toffendingToken = offendingToken || recognizer.getCurrentToken();\n\tstartToken = startToken || recognizer.getCurrentToken();\n\tinput = input || recognizer.getInputStream();\n\tRecognitionException.call(this, {message:\"\", recognizer:recognizer, input:input, ctx:ctx});\n    // Which configurations did we try at input.index() that couldn't match\n\t// input.LT(1)?//\n    this.deadEndConfigs = deadEndConfigs;\n    // The token object at the start index; the input stream might\n    // not be buffering tokens so get a reference to it. (At the\n    // time the error occurred, of course the stream needs to keep a\n    // buffer all of the tokens but later we might not have access to those.)\n    this.startToken = startToken;\n    this.offendingToken = offendingToken;\n}\n\nNoViableAltException.prototype = Object.create(RecognitionException.prototype);\nNoViableAltException.prototype.constructor = NoViableAltException;\n\n// This signifies any kind of mismatched input exceptions such as\n// when the current input does not match the expected token.\n//\nfunction InputMismatchException(recognizer) {\n\tRecognitionException.call(this, {message:\"\", recognizer:recognizer, input:recognizer.getInputStream(), ctx:recognizer._ctx});\n    this.offendingToken = recognizer.getCurrentToken();\n}\n\nInputMismatchException.prototype = Object.create(RecognitionException.prototype);\nInputMismatchException.prototype.constructor = InputMismatchException;\n\n// A semantic predicate failed during validation. Validation of predicates\n// occurs when normally parsing the alternative just like matching a token.\n// Disambiguating predicate evaluation occurs when we test a predicate during\n// prediction.\n\nfunction FailedPredicateException(recognizer, predicate, message) {\n\tRecognitionException.call(this, {message:this.formatMessage(predicate,message || null), recognizer:recognizer,\n                         input:recognizer.getInputStream(), ctx:recognizer._ctx});\n    var s = recognizer._interp.atn.states[recognizer.state];\n    var trans = s.transitions[0];\n    if (trans instanceof PredicateTransition) {\n        this.ruleIndex = trans.ruleIndex;\n        this.predicateIndex = trans.predIndex;\n    } else {\n        this.ruleIndex = 0;\n        this.predicateIndex = 0;\n    }\n    this.predicate = predicate;\n    this.offendingToken = recognizer.getCurrentToken();\n    return this;\n}\n\nFailedPredicateException.prototype = Object.create(RecognitionException.prototype);\nFailedPredicateException.prototype.constructor = FailedPredicateException;\n\nFailedPredicateException.prototype.formatMessage = function(predicate, message) {\n    if (message !==null) {\n        return message;\n    } else {\n        return \"failed predicate: {\" + predicate + \"}?\";\n    }\n};\n\nfunction ParseCancellationException() {\n\tError.call(this);\n\tError.captureStackTrace(this, ParseCancellationException);\n\treturn this;\n}\n\nParseCancellationException.prototype = Object.create(Error.prototype);\nParseCancellationException.prototype.constructor = ParseCancellationException;\n\nexports.RecognitionException = RecognitionException;\nexports.NoViableAltException = NoViableAltException;\nexports.LexerNoViableAltException = LexerNoViableAltException;\nexports.InputMismatchException = InputMismatchException;\nexports.FailedPredicateException = FailedPredicateException;\nexports.ParseCancellationException = ParseCancellationException;\n","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n\nexports.RecognitionException = require('./Errors').RecognitionException;\nexports.NoViableAltException = require('./Errors').NoViableAltException;\nexports.LexerNoViableAltException = require('./Errors').LexerNoViableAltException;\nexports.InputMismatchException = require('./Errors').InputMismatchException;\nexports.FailedPredicateException = require('./Errors').FailedPredicateException;\nexports.DiagnosticErrorListener = require('./DiagnosticErrorListener').DiagnosticErrorListener;\nexports.BailErrorStrategy = require('./ErrorStrategy').BailErrorStrategy;\nexports.ErrorListener = require('./ErrorListener').ErrorListener;\n","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\nexports.atn = require('./atn/index');\nexports.codepointat = require('./polyfills/codepointat');\nexports.dfa = require('./dfa/index');\nexports.fromcodepoint = require('./polyfills/fromcodepoint');\nexports.tree = require('./tree/index');\nexports.error = require('./error/index');\nexports.Token = require('./Token').Token;\nexports.CharStreams = require('./CharStreams').CharStreams;\nexports.CommonToken = require('./Token').CommonToken;\nexports.InputStream = require('./InputStream').InputStream;\nexports.FileStream = require('./FileStream').FileStream;\nexports.CommonTokenStream = require('./CommonTokenStream').CommonTokenStream;\nexports.Lexer = require('./Lexer').Lexer;\nexports.Parser = require('./Parser').Parser;\nvar pc = require('./PredictionContext');\nexports.PredictionContextCache = pc.PredictionContextCache;\nexports.ParserRuleContext = require('./ParserRuleContext').ParserRuleContext;\nexports.Interval = require('./IntervalSet').Interval;\nexports.Utils = require('./Utils');\n","/*! https://mths.be/codepointat v0.2.0 by @mathias */\nif (!String.prototype.codePointAt) {\n\t(function() {\n\t\t'use strict'; // needed to support `apply`/`call` with `undefined`/`null`\n\t\tvar defineProperty = (function() {\n\t\t\t// IE 8 only supports `Object.defineProperty` on DOM elements\n\t\t\ttry {\n\t\t\t\tvar object = {};\n\t\t\t\tvar $defineProperty = Object.defineProperty;\n\t\t\t\tvar result = $defineProperty(object, object, object) && $defineProperty;\n\t\t\t} catch(error) {}\n\t\t\treturn result;\n\t\t}());\n\t\tvar codePointAt = function(position) {\n\t\t\tif (this == null) {\n\t\t\t\tthrow TypeError();\n\t\t\t}\n\t\t\tvar string = String(this);\n\t\t\tvar size = string.length;\n\t\t\t// `ToInteger`\n\t\t\tvar index = position ? Number(position) : 0;\n\t\t\tif (index != index) { // better `isNaN`\n\t\t\t\tindex = 0;\n\t\t\t}\n\t\t\t// Account for out-of-bounds indices:\n\t\t\tif (index < 0 || index >= size) {\n\t\t\t\treturn undefined;\n\t\t\t}\n\t\t\t// Get the first code unit\n\t\t\tvar first = string.charCodeAt(index);\n\t\t\tvar second;\n\t\t\tif ( // check if it’s the start of a surrogate pair\n\t\t\t\tfirst >= 0xD800 && first <= 0xDBFF && // high surrogate\n\t\t\t\tsize > index + 1 // there is a next code unit\n\t\t\t) {\n\t\t\t\tsecond = string.charCodeAt(index + 1);\n\t\t\t\tif (second >= 0xDC00 && second <= 0xDFFF) { // low surrogate\n\t\t\t\t\t// https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae\n\t\t\t\t\treturn (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;\n\t\t\t\t}\n\t\t\t}\n\t\t\treturn first;\n\t\t};\n\t\tif (defineProperty) {\n\t\t\tdefineProperty(String.prototype, 'codePointAt', {\n\t\t\t\t'value': codePointAt,\n\t\t\t\t'configurable': true,\n\t\t\t\t'writable': true\n\t\t\t});\n\t\t} else {\n\t\t\tString.prototype.codePointAt = codePointAt;\n\t\t}\n\t}());\n}\n","/*! https://mths.be/fromcodepoint v0.2.1 by @mathias */\nif (!String.fromCodePoint) {\n\t(function() {\n\t\tvar defineProperty = (function() {\n\t\t\t// IE 8 only supports `Object.defineProperty` on DOM elements\n\t\t\ttry {\n\t\t\t\tvar object = {};\n\t\t\t\tvar $defineProperty = Object.defineProperty;\n\t\t\t\tvar result = $defineProperty(object, object, object) && $defineProperty;\n\t\t\t} catch(error) {}\n\t\t\treturn result;\n\t\t}());\n\t\tvar stringFromCharCode = String.fromCharCode;\n\t\tvar floor = Math.floor;\n\t\tvar fromCodePoint = function(_) {\n\t\t\tvar MAX_SIZE = 0x4000;\n\t\t\tvar codeUnits = [];\n\t\t\tvar highSurrogate;\n\t\t\tvar lowSurrogate;\n\t\t\tvar index = -1;\n\t\t\tvar length = arguments.length;\n\t\t\tif (!length) {\n\t\t\t\treturn '';\n\t\t\t}\n\t\t\tvar result = '';\n\t\t\twhile (++index < length) {\n\t\t\t\tvar codePoint = Number(arguments[index]);\n\t\t\t\tif (\n\t\t\t\t\t!isFinite(codePoint) || // `NaN`, `+Infinity`, or `-Infinity`\n\t\t\t\t\tcodePoint < 0 || // not a valid Unicode code point\n\t\t\t\t\tcodePoint > 0x10FFFF || // not a valid Unicode code point\n\t\t\t\t\tfloor(codePoint) != codePoint // not an integer\n\t\t\t\t) {\n\t\t\t\t\tthrow RangeError('Invalid code point: ' + codePoint);\n\t\t\t\t}\n\t\t\t\tif (codePoint <= 0xFFFF) { // BMP code point\n\t\t\t\t\tcodeUnits.push(codePoint);\n\t\t\t\t} else { // Astral code point; split in surrogate halves\n\t\t\t\t\t// https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae\n\t\t\t\t\tcodePoint -= 0x10000;\n\t\t\t\t\thighSurrogate = (codePoint >> 10) + 0xD800;\n\t\t\t\t\tlowSurrogate = (codePoint % 0x400) + 0xDC00;\n\t\t\t\t\tcodeUnits.push(highSurrogate, lowSurrogate);\n\t\t\t\t}\n\t\t\t\tif (index + 1 == length || codeUnits.length > MAX_SIZE) {\n\t\t\t\t\tresult += stringFromCharCode.apply(null, codeUnits);\n\t\t\t\t\tcodeUnits.length = 0;\n\t\t\t\t}\n\t\t\t}\n\t\t\treturn result;\n\t\t};\n\t\tif (defineProperty) {\n\t\t\tdefineProperty(String, 'fromCodePoint', {\n\t\t\t\t'value': fromCodePoint,\n\t\t\t\t'configurable': true,\n\t\t\t\t'writable': true\n\t\t\t});\n\t\t} else {\n\t\t\tString.fromCodePoint = fromCodePoint;\n\t\t}\n\t}());\n}\n","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n///\n\n// The basic notion of a tree has a parent, a payload, and a list of children.\n//  It is the most abstract interface for all the trees used by ANTLR.\n///\n\nvar Token = require('./../Token').Token;\nvar Interval = require('./../IntervalSet').Interval;\nvar INVALID_INTERVAL = new Interval(-1, -2);\nvar Utils = require('../Utils.js');\n\n\nfunction Tree() {\n\treturn this;\n}\n\nfunction SyntaxTree() {\n\tTree.call(this);\n\treturn this;\n}\n\nSyntaxTree.prototype = Object.create(Tree.prototype);\nSyntaxTree.prototype.constructor = SyntaxTree;\n\nfunction ParseTree() {\n\tSyntaxTree.call(this);\n\treturn this;\n}\n\nParseTree.prototype = Object.create(SyntaxTree.prototype);\nParseTree.prototype.constructor = ParseTree;\n\nfunction RuleNode() {\n\tParseTree.call(this);\n\treturn this;\n}\n\nRuleNode.prototype = Object.create(ParseTree.prototype);\nRuleNode.prototype.constructor = RuleNode;\n\nfunction TerminalNode() {\n\tParseTree.call(this);\n\treturn this;\n}\n\nTerminalNode.prototype = Object.create(ParseTree.prototype);\nTerminalNode.prototype.constructor = TerminalNode;\n\nfunction ErrorNode() {\n\tTerminalNode.call(this);\n\treturn this;\n}\n\nErrorNode.prototype = Object.create(TerminalNode.prototype);\nErrorNode.prototype.constructor = ErrorNode;\n\nfunction ParseTreeVisitor() {\n\treturn this;\n}\n\nParseTreeVisitor.prototype.visit = function(ctx) {\n \tif (Array.isArray(ctx)) {\n\t\treturn ctx.map(function(child) {\n            return child.accept(this);\n        }, this);\n\t} else {\n\t\treturn ctx.accept(this);\n\t}\n};\n\nParseTreeVisitor.prototype.visitChildren = function(ctx) {\n\tif (ctx.children) {\n\t\treturn this.visit(ctx.children);\n\t} else {\n\t\treturn null;\n\t}\n}\n\nParseTreeVisitor.prototype.visitTerminal = function(node) {\n};\n\nParseTreeVisitor.prototype.visitErrorNode = function(node) {\n};\n\n\nfunction ParseTreeListener() {\n\treturn this;\n}\n\nParseTreeListener.prototype.visitTerminal = function(node) {\n};\n\nParseTreeListener.prototype.visitErrorNode = function(node) {\n};\n\nParseTreeListener.prototype.enterEveryRule = function(node) {\n};\n\nParseTreeListener.prototype.exitEveryRule = function(node) {\n};\n\nfunction TerminalNodeImpl(symbol) {\n\tTerminalNode.call(this);\n\tthis.parentCtx = null;\n\tthis.symbol = symbol;\n\treturn this;\n}\n\nTerminalNodeImpl.prototype = Object.create(TerminalNode.prototype);\nTerminalNodeImpl.prototype.constructor = TerminalNodeImpl;\n\nTerminalNodeImpl.prototype.getChild = function(i) {\n\treturn null;\n};\n\nTerminalNodeImpl.prototype.getSymbol = function() {\n\treturn this.symbol;\n};\n\nTerminalNodeImpl.prototype.getParent = function() {\n\treturn this.parentCtx;\n};\n\nTerminalNodeImpl.prototype.getPayload = function() {\n\treturn this.symbol;\n};\n\nTerminalNodeImpl.prototype.getSourceInterval = function() {\n\tif (this.symbol === null) {\n\t\treturn INVALID_INTERVAL;\n\t}\n\tvar tokenIndex = this.symbol.tokenIndex;\n\treturn new Interval(tokenIndex, tokenIndex);\n};\n\nTerminalNodeImpl.prototype.getChildCount = function() {\n\treturn 0;\n};\n\nTerminalNodeImpl.prototype.accept = function(visitor) {\n\treturn visitor.visitTerminal(this);\n};\n\nTerminalNodeImpl.prototype.getText = function() {\n\treturn this.symbol.text;\n};\n\nTerminalNodeImpl.prototype.toString = function() {\n\tif (this.symbol.type === Token.EOF) {\n\t\treturn \"<EOF>\";\n\t} else {\n\t\treturn this.symbol.text;\n\t}\n};\n\n// Represents a token that was consumed during resynchronization\n// rather than during a valid match operation. For example,\n// we will create this kind of a node during single token insertion\n// and deletion as well as during \"consume until error recovery set\"\n// upon no viable alternative exceptions.\n\nfunction ErrorNodeImpl(token) {\n\tTerminalNodeImpl.call(this, token);\n\treturn this;\n}\n\nErrorNodeImpl.prototype = Object.create(TerminalNodeImpl.prototype);\nErrorNodeImpl.prototype.constructor = ErrorNodeImpl;\n\nErrorNodeImpl.prototype.isErrorNode = function() {\n\treturn true;\n};\n\nErrorNodeImpl.prototype.accept = function(visitor) {\n\treturn visitor.visitErrorNode(this);\n};\n\nfunction ParseTreeWalker() {\n\treturn this;\n}\n\nParseTreeWalker.prototype.walk = function(listener, t) {\n\tvar errorNode = t instanceof ErrorNode ||\n\t\t\t(t.isErrorNode !== undefined && t.isErrorNode());\n\tif (errorNode) {\n\t\tlistener.visitErrorNode(t);\n\t} else if (t instanceof TerminalNode) {\n\t\tlistener.visitTerminal(t);\n\t} else {\n\t\tthis.enterRule(listener, t);\n\t\tfor (var i = 0; i < t.getChildCount(); i++) {\n\t\t\tvar child = t.getChild(i);\n\t\t\tthis.walk(listener, child);\n\t\t}\n\t\tthis.exitRule(listener, t);\n\t}\n};\n//\n// The discovery of a rule node, involves sending two events: the generic\n// {@link ParseTreeListener//enterEveryRule} and a\n// {@link RuleContext}-specific event. First we trigger the generic and then\n// the rule specific. We to them in reverse order upon finishing the node.\n//\nParseTreeWalker.prototype.enterRule = function(listener, r) {\n\tvar ctx = r.getRuleContext();\n\tlistener.enterEveryRule(ctx);\n\tctx.enterRule(listener);\n};\n\nParseTreeWalker.prototype.exitRule = function(listener, r) {\n\tvar ctx = r.getRuleContext();\n\tctx.exitRule(listener);\n\tlistener.exitEveryRule(ctx);\n};\n\nParseTreeWalker.DEFAULT = new ParseTreeWalker();\n\nexports.RuleNode = RuleNode;\nexports.ErrorNode = ErrorNode;\nexports.TerminalNode = TerminalNode;\nexports.ErrorNodeImpl = ErrorNodeImpl;\nexports.TerminalNodeImpl = TerminalNodeImpl;\nexports.ParseTreeListener = ParseTreeListener;\nexports.ParseTreeVisitor = ParseTreeVisitor;\nexports.ParseTreeWalker = ParseTreeWalker;\nexports.INVALID_INTERVAL = INVALID_INTERVAL;\n","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n\nvar Utils = require('./../Utils');\nvar Token = require('./../Token').Token;\nvar RuleNode = require('./Tree').RuleNode;\nvar ErrorNode = require('./Tree').ErrorNode;\nvar TerminalNode = require('./Tree').TerminalNode;\nvar ParserRuleContext = require('./../ParserRuleContext').ParserRuleContext;\nvar RuleContext = require('./../RuleContext').RuleContext;\nvar INVALID_ALT_NUMBER = require('./../atn/ATN').INVALID_ALT_NUMBER;\n\n\n/** A set of utility routines useful for all kinds of ANTLR trees. */\nfunction Trees() {\n}\n\n// Print out a whole tree in LISP form. {@link //getNodeText} is used on the\n//  node payloads to get the text for the nodes.  Detect\n//  parse trees and extract data appropriately.\nTrees.toStringTree = function(tree, ruleNames, recog) {\n\truleNames = ruleNames || null;\n\trecog = recog || null;\n    if(recog!==null) {\n       ruleNames = recog.ruleNames;\n    }\n    var s = Trees.getNodeText(tree, ruleNames);\n    s = Utils.escapeWhitespace(s, false);\n    var c = tree.getChildCount();\n    if(c===0) {\n        return s;\n    }\n    var res = \"(\" + s + ' ';\n    if(c>0) {\n        s = Trees.toStringTree(tree.getChild(0), ruleNames);\n        res = res.concat(s);\n    }\n    for(var i=1;i<c;i++) {\n        s = Trees.toStringTree(tree.getChild(i), ruleNames);\n        res = res.concat(' ' + s);\n    }\n    res = res.concat(\")\");\n    return res;\n};\n\nTrees.getNodeText = function(t, ruleNames, recog) {\n\truleNames = ruleNames || null;\n\trecog = recog || null;\n    if(recog!==null) {\n        ruleNames = recog.ruleNames;\n    }\n    if(ruleNames!==null) {\n       if (t instanceof RuleContext) {\n           var altNumber = t.getAltNumber();\n           if ( altNumber!=INVALID_ALT_NUMBER ) {\n               return ruleNames[t.ruleIndex]+\":\"+altNumber;\n           }\n           return ruleNames[t.ruleIndex];\n       } else if ( t instanceof ErrorNode) {\n           return t.toString();\n       } else if(t instanceof TerminalNode) {\n           if(t.symbol!==null) {\n               return t.symbol.text;\n           }\n       }\n    }\n    // no recog for rule names\n    var payload = t.getPayload();\n    if (payload instanceof Token ) {\n       return payload.text;\n    }\n    return t.getPayload().toString();\n};\n\n\n// Return ordered list of all children of this node\nTrees.getChildren = function(t) {\n\tvar list = [];\n\tfor(var i=0;i<t.getChildCount();i++) {\n\t\tlist.push(t.getChild(i));\n\t}\n\treturn list;\n};\n\n// Return a list of all ancestors of this node.  The first node of\n//  list is the root and the last is the parent of this node.\n//\nTrees.getAncestors = function(t) {\n    var ancestors = [];\n    t = t.getParent();\n    while(t!==null) {\n        ancestors = [t].concat(ancestors);\n        t = t.getParent();\n    }\n    return ancestors;\n};\n\nTrees.findAllTokenNodes = function(t, ttype) {\n    return Trees.findAllNodes(t, ttype, true);\n};\n\nTrees.findAllRuleNodes = function(t, ruleIndex) {\n\treturn Trees.findAllNodes(t, ruleIndex, false);\n};\n\nTrees.findAllNodes = function(t, index, findTokens) {\n\tvar nodes = [];\n\tTrees._findAllNodes(t, index, findTokens, nodes);\n\treturn nodes;\n};\n\nTrees._findAllNodes = function(t, index, findTokens, nodes) {\n\t// check this node (the root) first\n\tif(findTokens && (t instanceof TerminalNode)) {\n\t\tif(t.symbol.type===index) {\n\t\t\tnodes.push(t);\n\t\t}\n\t} else if(!findTokens && (t instanceof ParserRuleContext)) {\n\t\tif(t.ruleIndex===index) {\n\t\t\tnodes.push(t);\n\t\t}\n\t}\n\t// check children\n\tfor(var i=0;i<t.getChildCount();i++) {\n\t\tTrees._findAllNodes(t.getChild(i), index, findTokens, nodes);\n\t}\n};\n\nTrees.descendants = function(t) {\n\tvar nodes = [t];\n    for(var i=0;i<t.getChildCount();i++) {\n        nodes = nodes.concat(Trees.descendants(t.getChild(i)));\n    }\n    return nodes;\n};\n\n\nexports.Trees = Trees;","/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.\n * Use of this file is governed by the BSD 3-clause license that\n * can be found in the LICENSE.txt file in the project root.\n */\n\nvar Tree = require('./Tree');\nexports.Trees = require('./Trees').Trees;\nexports.RuleNode = Tree.RuleNode;\nexports.ParseTreeListener = Tree.ParseTreeListener;\nexports.ParseTreeVisitor = Tree.ParseTreeVisitor;\nexports.ParseTreeWalker = Tree.ParseTreeWalker;\n","// CodeMirror, copyright (c) by Marijn Haverbeke and others\n// Distributed under an MIT license: https://codemirror.net/LICENSE\n\n(function(mod) {\n  if (typeof exports == \"object\" && typeof module == \"object\") // CommonJS\n    mod(require(\"../../lib/codemirror\"));\n  else if (typeof define == \"function\" && define.amd) // AMD\n    define([\"../../lib/codemirror\"], mod);\n  else // Plain browser env\n    mod(CodeMirror);\n})(function(CodeMirror) {\n  var defaults = {\n    pairs: \"()[]{}''\\\"\\\"\",\n    closeBefore: \")]}'\\\":;>\",\n    triples: \"\",\n    explode: \"[]{}\"\n  };\n\n  var Pos = CodeMirror.Pos;\n\n  CodeMirror.defineOption(\"autoCloseBrackets\", false, function(cm, val, old) {\n    if (old && old != CodeMirror.Init) {\n      cm.removeKeyMap(keyMap);\n      cm.state.closeBrackets = null;\n    }\n    if (val) {\n      ensureBound(getOption(val, \"pairs\"))\n      cm.state.closeBrackets = val;\n      cm.addKeyMap(keyMap);\n    }\n  });\n\n  function getOption(conf, name) {\n    if (name == \"pairs\" && typeof conf == \"string\") return conf;\n    if (typeof conf == \"object\" && conf[name] != null) return conf[name];\n    return defaults[name];\n  }\n\n  var keyMap = {Backspace: handleBackspace, Enter: handleEnter};\n  function ensureBound(chars) {\n    for (var i = 0; i < chars.length; i++) {\n      var ch = chars.charAt(i), key = \"'\" + ch + \"'\"\n      if (!keyMap[key]) keyMap[key] = handler(ch)\n    }\n  }\n  ensureBound(defaults.pairs + \"`\")\n\n  function handler(ch) {\n    return function(cm) { return handleChar(cm, ch); };\n  }\n\n  function getConfig(cm) {\n    var deflt = cm.state.closeBrackets;\n    if (!deflt || deflt.override) return deflt;\n    var mode = cm.getModeAt(cm.getCursor());\n    return mode.closeBrackets || deflt;\n  }\n\n  function handleBackspace(cm) {\n    var conf = getConfig(cm);\n    if (!conf || cm.getOption(\"disableInput\")) return CodeMirror.Pass;\n\n    var pairs = getOption(conf, \"pairs\");\n    var ranges = cm.listSelections();\n    for (var i = 0; i < ranges.length; i++) {\n      if (!ranges[i].empty()) return CodeMirror.Pass;\n      var around = charsAround(cm, ranges[i].head);\n      if (!around || pairs.indexOf(around) % 2 != 0) return CodeMirror.Pass;\n    }\n    for (var i = ranges.length - 1; i >= 0; i--) {\n      var cur = ranges[i].head;\n      cm.replaceRange(\"\", Pos(cur.line, cur.ch - 1), Pos(cur.line, cur.ch + 1), \"+delete\");\n    }\n  }\n\n  function handleEnter(cm) {\n    var conf = getConfig(cm);\n    var explode = conf && getOption(conf, \"explode\");\n    if (!explode || cm.getOption(\"disableInput\")) return CodeMirror.Pass;\n\n    var ranges = cm.listSelections();\n    for (var i = 0; i < ranges.length; i++) {\n      if (!ranges[i].empty()) return CodeMirror.Pass;\n      var around = charsAround(cm, ranges[i].head);\n      if (!around || explode.indexOf(around) % 2 != 0) return CodeMirror.Pass;\n    }\n    cm.operation(function() {\n      var linesep = cm.lineSeparator() || \"\\n\";\n      cm.replaceSelection(linesep + linesep, null);\n      cm.execCommand(\"goCharLeft\");\n      ranges = cm.listSelections();\n      for (var i = 0; i < ranges.length; i++) {\n        var line = ranges[i].head.line;\n        cm.indentLine(line, null, true);\n        cm.indentLine(line + 1, null, true);\n      }\n    });\n  }\n\n  function contractSelection(sel) {\n    var inverted = CodeMirror.cmpPos(sel.anchor, sel.head) > 0;\n    return {anchor: new Pos(sel.anchor.line, sel.anchor.ch + (inverted ? -1 : 1)),\n            head: new Pos(sel.head.line, sel.head.ch + (inverted ? 1 : -1))};\n  }\n\n  function handleChar(cm, ch) {\n    var conf = getConfig(cm);\n    if (!conf || cm.getOption(\"disableInput\")) return CodeMirror.Pass;\n\n    var pairs = getOption(conf, \"pairs\");\n    var pos = pairs.indexOf(ch);\n    if (pos == -1) return CodeMirror.Pass;\n\n    var closeBefore = getOption(conf,\"closeBefore\");\n\n    var triples = getOption(conf, \"triples\");\n\n    var identical = pairs.charAt(pos + 1) == ch;\n    var ranges = cm.listSelections();\n    var opening = pos % 2 == 0;\n\n    var type;\n    for (var i = 0; i < ranges.length; i++) {\n      var range = ranges[i], cur = range.head, curType;\n      var next = cm.getRange(cur, Pos(cur.line, cur.ch + 1));\n      if (opening && !range.empty()) {\n        curType = \"surround\";\n      } else if ((identical || !opening) && next == ch) {\n        if (identical && stringStartsAfter(cm, cur))\n          curType = \"both\";\n        else if (triples.indexOf(ch) >= 0 && cm.getRange(cur, Pos(cur.line, cur.ch + 3)) == ch + ch + ch)\n          curType = \"skipThree\";\n        else\n          curType = \"skip\";\n      } else if (identical && cur.ch > 1 && triples.indexOf(ch) >= 0 &&\n                 cm.getRange(Pos(cur.line, cur.ch - 2), cur) == ch + ch) {\n        if (cur.ch > 2 && /\\bstring/.test(cm.getTokenTypeAt(Pos(cur.line, cur.ch - 2)))) return CodeMirror.Pass;\n        curType = \"addFour\";\n      } else if (identical) {\n        var prev = cur.ch == 0 ? \" \" : cm.getRange(Pos(cur.line, cur.ch - 1), cur)\n        if (!CodeMirror.isWordChar(next) && prev != ch && !CodeMirror.isWordChar(prev)) curType = \"both\";\n        else return CodeMirror.Pass;\n      } else if (opening && (next.length === 0 || /\\s/.test(next) || closeBefore.indexOf(next) > -1)) {\n        curType = \"both\";\n      } else {\n        return CodeMirror.Pass;\n      }\n      if (!type) type = curType;\n      else if (type != curType) return CodeMirror.Pass;\n    }\n\n    var left = pos % 2 ? pairs.charAt(pos - 1) : ch;\n    var right = pos % 2 ? ch : pairs.charAt(pos + 1);\n    cm.operation(function() {\n      if (type == \"skip\") {\n        cm.execCommand(\"goCharRight\");\n      } else if (type == \"skipThree\") {\n        for (var i = 0; i < 3; i++)\n          cm.execCommand(\"goCharRight\");\n      } else if (type == \"surround\") {\n        var sels = cm.getSelections();\n        for (var i = 0; i < sels.length; i++)\n          sels[i] = left + sels[i] + right;\n        cm.replaceSelections(sels, \"around\");\n        sels = cm.listSelections().slice();\n        for (var i = 0; i < sels.length; i++)\n          sels[i] = contractSelection(sels[i]);\n        cm.setSelections(sels);\n      } else if (type == \"both\") {\n        cm.replaceSelection(left + right, null);\n        cm.triggerElectric(left + right);\n        cm.execCommand(\"goCharLeft\");\n      } else if (type == \"addFour\") {\n        cm.replaceSelection(left + left + left + left, \"before\");\n        cm.execCommand(\"goCharRight\");\n      }\n    });\n  }\n\n  function charsAround(cm, pos) {\n    var str = cm.getRange(Pos(pos.line, pos.ch - 1),\n                          Pos(pos.line, pos.ch + 1));\n    return str.length == 2 ? str : null;\n  }\n\n  function stringStartsAfter(cm, pos) {\n    var token = cm.getTokenAt(Pos(pos.line, pos.ch + 1))\n    return /\\bstring/.test(token.type) && token.start == pos.ch &&\n      (pos.ch == 0 || !/\\bstring/.test(cm.getTokenTypeAt(pos)))\n  }\n});\n","// CodeMirror, copyright (c) by Marijn Haverbeke and others\n// Distributed under an MIT license: https://codemirror.net/LICENSE\n\n(function(mod) {\n  if (typeof exports == \"object\" && typeof module == \"object\") // CommonJS\n    mod(require(\"../../lib/codemirror\"));\n  else if (typeof define == \"function\" && define.amd) // AMD\n    define([\"../../lib/codemirror\"], mod);\n  else // Plain browser env\n    mod(CodeMirror);\n})(function(CodeMirror) {\n  var ie_lt8 = /MSIE \\d/.test(navigator.userAgent) &&\n    (document.documentMode == null || document.documentMode < 8);\n\n  var Pos = CodeMirror.Pos;\n\n  var matching = {\"(\": \")>\", \")\": \"(<\", \"[\": \"]>\", \"]\": \"[<\", \"{\": \"}>\", \"}\": \"{<\", \"<\": \">>\", \">\": \"<<\"};\n\n  function bracketRegex(config) {\n    return config && config.bracketRegex || /[(){}[\\]]/\n  }\n\n  function findMatchingBracket(cm, where, config) {\n    var line = cm.getLineHandle(where.line), pos = where.ch - 1;\n    var afterCursor = config && config.afterCursor\n    if (afterCursor == null)\n      afterCursor = /(^| )cm-fat-cursor($| )/.test(cm.getWrapperElement().className)\n    var re = bracketRegex(config)\n\n    // A cursor is defined as between two characters, but in in vim command mode\n    // (i.e. not insert mode), the cursor is visually represented as a\n    // highlighted box on top of the 2nd character. Otherwise, we allow matches\n    // from before or after the cursor.\n    var match = (!afterCursor && pos >= 0 && re.test(line.text.charAt(pos)) && matching[line.text.charAt(pos)]) ||\n        re.test(line.text.charAt(pos + 1)) && matching[line.text.charAt(++pos)];\n    if (!match) return null;\n    var dir = match.charAt(1) == \">\" ? 1 : -1;\n    if (config && config.strict && (dir > 0) != (pos == where.ch)) return null;\n    var style = cm.getTokenTypeAt(Pos(where.line, pos + 1));\n\n    var found = scanForBracket(cm, Pos(where.line, pos + (dir > 0 ? 1 : 0)), dir, style || null, config);\n    if (found == null) return null;\n    return {from: Pos(where.line, pos), to: found && found.pos,\n            match: found && found.ch == match.charAt(0), forward: dir > 0};\n  }\n\n  // bracketRegex is used to specify which type of bracket to scan\n  // should be a regexp, e.g. /[[\\]]/\n  //\n  // Note: If \"where\" is on an open bracket, then this bracket is ignored.\n  //\n  // Returns false when no bracket was found, null when it reached\n  // maxScanLines and gave up\n  function scanForBracket(cm, where, dir, style, config) {\n    var maxScanLen = (config && config.maxScanLineLength) || 10000;\n    var maxScanLines = (config && config.maxScanLines) || 1000;\n\n    var stack = [];\n    var re = bracketRegex(config)\n    var lineEnd = dir > 0 ? Math.min(where.line + maxScanLines, cm.lastLine() + 1)\n                          : Math.max(cm.firstLine() - 1, where.line - maxScanLines);\n    for (var lineNo = where.line; lineNo != lineEnd; lineNo += dir) {\n      var line = cm.getLine(lineNo);\n      if (!line) continue;\n      var pos = dir > 0 ? 0 : line.length - 1, end = dir > 0 ? line.length : -1;\n      if (line.length > maxScanLen) continue;\n      if (lineNo == where.line) pos = where.ch - (dir < 0 ? 1 : 0);\n      for (; pos != end; pos += dir) {\n        var ch = line.charAt(pos);\n        if (re.test(ch) && (style === undefined || cm.getTokenTypeAt(Pos(lineNo, pos + 1)) == style)) {\n          var match = matching[ch];\n          if (match && (match.charAt(1) == \">\") == (dir > 0)) stack.push(ch);\n          else if (!stack.length) return {pos: Pos(lineNo, pos), ch: ch};\n          else stack.pop();\n        }\n      }\n    }\n    return lineNo - dir == (dir > 0 ? cm.lastLine() : cm.firstLine()) ? false : null;\n  }\n\n  function matchBrackets(cm, autoclear, config) {\n    // Disable brace matching in long lines, since it'll cause hugely slow updates\n    var maxHighlightLen = cm.state.matchBrackets.maxHighlightLineLength || 1000;\n    var marks = [], ranges = cm.listSelections();\n    for (var i = 0; i < ranges.length; i++) {\n      var match = ranges[i].empty() && findMatchingBracket(cm, ranges[i].head, config);\n      if (match && cm.getLine(match.from.line).length <= maxHighlightLen) {\n        var style = match.match ? \"CodeMirror-matchingbracket\" : \"CodeMirror-nonmatchingbracket\";\n        marks.push(cm.markText(match.from, Pos(match.from.line, match.from.ch + 1), {className: style}));\n        if (match.to && cm.getLine(match.to.line).length <= maxHighlightLen)\n          marks.push(cm.markText(match.to, Pos(match.to.line, match.to.ch + 1), {className: style}));\n      }\n    }\n\n    if (marks.length) {\n      // Kludge to work around the IE bug from issue #1193, where text\n      // input stops going to the textare whever this fires.\n      if (ie_lt8 && cm.state.focused) cm.focus();\n\n      var clear = function() {\n        cm.operation(function() {\n          for (var i = 0; i < marks.length; i++) marks[i].clear();\n        });\n      };\n      if (autoclear) setTimeout(clear, 800);\n      else return clear;\n    }\n  }\n\n  function doMatchBrackets(cm) {\n    cm.operation(function() {\n      if (cm.state.matchBrackets.currentlyHighlighted) {\n        cm.state.matchBrackets.currentlyHighlighted();\n        cm.state.matchBrackets.currentlyHighlighted = null;\n      }\n      cm.state.matchBrackets.currentlyHighlighted = matchBrackets(cm, false, cm.state.matchBrackets);\n    });\n  }\n\n  CodeMirror.defineOption(\"matchBrackets\", false, function(cm, val, old) {\n    function clear(cm) {\n      if (cm.state.matchBrackets && cm.state.matchBrackets.currentlyHighlighted) {\n        cm.state.matchBrackets.currentlyHighlighted();\n        cm.state.matchBrackets.currentlyHighlighted = null;\n      }\n    }\n\n    if (old && old != CodeMirror.Init) {\n      cm.off(\"cursorActivity\", doMatchBrackets);\n      cm.off(\"focus\", doMatchBrackets)\n      cm.off(\"blur\", clear)\n      clear(cm);\n    }\n    if (val) {\n      cm.state.matchBrackets = typeof val == \"object\" ? val : {};\n      cm.on(\"cursorActivity\", doMatchBrackets);\n      cm.on(\"focus\", doMatchBrackets)\n      cm.on(\"blur\", clear)\n    }\n  });\n\n  CodeMirror.defineExtension(\"matchBrackets\", function() {matchBrackets(this, true);});\n  CodeMirror.defineExtension(\"findMatchingBracket\", function(pos, config, oldConfig){\n    // Backwards-compatibility kludge\n    if (oldConfig || typeof config == \"boolean\") {\n      if (!oldConfig) {\n        config = config ? {strict: true} : null\n      } else {\n        oldConfig.strict = config\n        config = oldConfig\n      }\n    }\n    return findMatchingBracket(this, pos, config)\n  });\n  CodeMirror.defineExtension(\"scanForBracket\", function(pos, dir, style, config){\n    return scanForBracket(this, pos, dir, style, config);\n  });\n});\n","// CodeMirror, copyright (c) by Marijn Haverbeke and others\n// Distributed under an MIT license: https://codemirror.net/LICENSE\n\n(function(mod) {\n  if (typeof exports == \"object\" && typeof module == \"object\") // CommonJS\n    mod(require(\"../../lib/codemirror\"));\n  else if (typeof define == \"function\" && define.amd) // AMD\n    define([\"../../lib/codemirror\"], mod);\n  else // Plain browser env\n    mod(CodeMirror);\n})(function(CodeMirror) {\n  \"use strict\";\n  var WRAP_CLASS = \"CodeMirror-activeline\";\n  var BACK_CLASS = \"CodeMirror-activeline-background\";\n  var GUTT_CLASS = \"CodeMirror-activeline-gutter\";\n\n  CodeMirror.defineOption(\"styleActiveLine\", false, function(cm, val, old) {\n    var prev = old == CodeMirror.Init ? false : old;\n    if (val == prev) return\n    if (prev) {\n      cm.off(\"beforeSelectionChange\", selectionChange);\n      clearActiveLines(cm);\n      delete cm.state.activeLines;\n    }\n    if (val) {\n      cm.state.activeLines = [];\n      updateActiveLines(cm, cm.listSelections());\n      cm.on(\"beforeSelectionChange\", selectionChange);\n    }\n  });\n\n  function clearActiveLines(cm) {\n    for (var i = 0; i < cm.state.activeLines.length; i++) {\n      cm.removeLineClass(cm.state.activeLines[i], \"wrap\", WRAP_CLASS);\n      cm.removeLineClass(cm.state.activeLines[i], \"background\", BACK_CLASS);\n      cm.removeLineClass(cm.state.activeLines[i], \"gutter\", GUTT_CLASS);\n    }\n  }\n\n  function sameArray(a, b) {\n    if (a.length != b.length) return false;\n    for (var i = 0; i < a.length; i++)\n      if (a[i] != b[i]) return false;\n    return true;\n  }\n\n  function updateActiveLines(cm, ranges) {\n    var active = [];\n    for (var i = 0; i < ranges.length; i++) {\n      var range = ranges[i];\n      var option = cm.getOption(\"styleActiveLine\");\n      if (typeof option == \"object\" && option.nonEmpty ? range.anchor.line != range.head.line : !range.empty())\n        continue\n      var line = cm.getLineHandleVisualStart(range.head.line);\n      if (active[active.length - 1] != line) active.push(line);\n    }\n    if (sameArray(cm.state.activeLines, active)) return;\n    cm.operation(function() {\n      clearActiveLines(cm);\n      for (var i = 0; i < active.length; i++) {\n        cm.addLineClass(active[i], \"wrap\", WRAP_CLASS);\n        cm.addLineClass(active[i], \"background\", BACK_CLASS);\n        cm.addLineClass(active[i], \"gutter\", GUTT_CLASS);\n      }\n      cm.state.activeLines = active;\n    });\n  }\n\n  function selectionChange(cm, sel) {\n    updateActiveLines(cm, sel.ranges);\n  }\n});\n","// CodeMirror, copyright (c) by Marijn Haverbeke and others\n// Distributed under an MIT license: https://codemirror.net/LICENSE\n\n// This is CodeMirror (https://codemirror.net), a code editor\n// implemented in JavaScript on top of the browser's DOM.\n//\n// You can find some technical background for some of the code below\n// at http://marijnhaverbeke.nl/blog/#cm-internals .\n\n(function (global, factory) {\n  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :\n  typeof define === 'function' && define.amd ? define(factory) :\n  (global = global || self, global.CodeMirror = factory());\n}(this, (function () { 'use strict';\n\n  // Kludges for bugs and behavior differences that can't be feature\n  // detected are enabled based on userAgent etc sniffing.\n  var userAgent = navigator.userAgent;\n  var platform = navigator.platform;\n\n  var gecko = /gecko\\/\\d/i.test(userAgent);\n  var ie_upto10 = /MSIE \\d/.test(userAgent);\n  var ie_11up = /Trident\\/(?:[7-9]|\\d{2,})\\..*rv:(\\d+)/.exec(userAgent);\n  var edge = /Edge\\/(\\d+)/.exec(userAgent);\n  var ie = ie_upto10 || ie_11up || edge;\n  var ie_version = ie && (ie_upto10 ? document.documentMode || 6 : +(edge || ie_11up)[1]);\n  var webkit = !edge && /WebKit\\//.test(userAgent);\n  var qtwebkit = webkit && /Qt\\/\\d+\\.\\d+/.test(userAgent);\n  var chrome = !edge && /Chrome\\//.test(userAgent);\n  var presto = /Opera\\//.test(userAgent);\n  var safari = /Apple Computer/.test(navigator.vendor);\n  var mac_geMountainLion = /Mac OS X 1\\d\\D([8-9]|\\d\\d)\\D/.test(userAgent);\n  var phantom = /PhantomJS/.test(userAgent);\n\n  var ios = !edge && /AppleWebKit/.test(userAgent) && /Mobile\\/\\w+/.test(userAgent);\n  var android = /Android/.test(userAgent);\n  // This is woefully incomplete. Suggestions for alternative methods welcome.\n  var mobile = ios || android || /webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(userAgent);\n  var mac = ios || /Mac/.test(platform);\n  var chromeOS = /\\bCrOS\\b/.test(userAgent);\n  var windows = /win/i.test(platform);\n\n  var presto_version = presto && userAgent.match(/Version\\/(\\d*\\.\\d*)/);\n  if (presto_version) { presto_version = Number(presto_version[1]); }\n  if (presto_version && presto_version >= 15) { presto = false; webkit = true; }\n  // Some browsers use the wrong event properties to signal cmd/ctrl on OS X\n  var flipCtrlCmd = mac && (qtwebkit || presto && (presto_version == null || presto_version < 12.11));\n  var captureRightClick = gecko || (ie && ie_version >= 9);\n\n  function classTest(cls) { return new RegExp(\"(^|\\\\s)\" + cls + \"(?:$|\\\\s)\\\\s*\") }\n\n  var rmClass = function(node, cls) {\n    var current = node.className;\n    var match = classTest(cls).exec(current);\n    if (match) {\n      var after = current.slice(match.index + match[0].length);\n      node.className = current.slice(0, match.index) + (after ? match[1] + after : \"\");\n    }\n  };\n\n  function removeChildren(e) {\n    for (var count = e.childNodes.length; count > 0; --count)\n      { e.removeChild(e.firstChild); }\n    return e\n  }\n\n  function removeChildrenAndAdd(parent, e) {\n    return removeChildren(parent).appendChild(e)\n  }\n\n  function elt(tag, content, className, style) {\n    var e = document.createElement(tag);\n    if (className) { e.className = className; }\n    if (style) { e.style.cssText = style; }\n    if (typeof content == \"string\") { e.appendChild(document.createTextNode(content)); }\n    else if (content) { for (var i = 0; i < content.length; ++i) { e.appendChild(content[i]); } }\n    return e\n  }\n  // wrapper for elt, which removes the elt from the accessibility tree\n  function eltP(tag, content, className, style) {\n    var e = elt(tag, content, className, style);\n    e.setAttribute(\"role\", \"presentation\");\n    return e\n  }\n\n  var range;\n  if (document.createRange) { range = function(node, start, end, endNode) {\n    var r = document.createRange();\n    r.setEnd(endNode || node, end);\n    r.setStart(node, start);\n    return r\n  }; }\n  else { range = function(node, start, end) {\n    var r = document.body.createTextRange();\n    try { r.moveToElementText(node.parentNode); }\n    catch(e) { return r }\n    r.collapse(true);\n    r.moveEnd(\"character\", end);\n    r.moveStart(\"character\", start);\n    return r\n  }; }\n\n  function contains(parent, child) {\n    if (child.nodeType == 3) // Android browser always returns false when child is a textnode\n      { child = child.parentNode; }\n    if (parent.contains)\n      { return parent.contains(child) }\n    do {\n      if (child.nodeType == 11) { child = child.host; }\n      if (child == parent) { return true }\n    } while (child = child.parentNode)\n  }\n\n  function activeElt() {\n    // IE and Edge may throw an \"Unspecified Error\" when accessing document.activeElement.\n    // IE < 10 will throw when accessed while the page is loading or in an iframe.\n    // IE > 9 and Edge will throw when accessed in an iframe if document.body is unavailable.\n    var activeElement;\n    try {\n      activeElement = document.activeElement;\n    } catch(e) {\n      activeElement = document.body || null;\n    }\n    while (activeElement && activeElement.shadowRoot && activeElement.shadowRoot.activeElement)\n      { activeElement = activeElement.shadowRoot.activeElement; }\n    return activeElement\n  }\n\n  function addClass(node, cls) {\n    var current = node.className;\n    if (!classTest(cls).test(current)) { node.className += (current ? \" \" : \"\") + cls; }\n  }\n  function joinClasses(a, b) {\n    var as = a.split(\" \");\n    for (var i = 0; i < as.length; i++)\n      { if (as[i] && !classTest(as[i]).test(b)) { b += \" \" + as[i]; } }\n    return b\n  }\n\n  var selectInput = function(node) { node.select(); };\n  if (ios) // Mobile Safari apparently has a bug where select() is broken.\n    { selectInput = function(node) { node.selectionStart = 0; node.selectionEnd = node.value.length; }; }\n  else if (ie) // Suppress mysterious IE10 errors\n    { selectInput = function(node) { try { node.select(); } catch(_e) {} }; }\n\n  function bind(f) {\n    var args = Array.prototype.slice.call(arguments, 1);\n    return function(){return f.apply(null, args)}\n  }\n\n  function copyObj(obj, target, overwrite) {\n    if (!target) { target = {}; }\n    for (var prop in obj)\n      { if (obj.hasOwnProperty(prop) && (overwrite !== false || !target.hasOwnProperty(prop)))\n        { target[prop] = obj[prop]; } }\n    return target\n  }\n\n  // Counts the column offset in a string, taking tabs into account.\n  // Used mostly to find indentation.\n  function countColumn(string, end, tabSize, startIndex, startValue) {\n    if (end == null) {\n      end = string.search(/[^\\s\\u00a0]/);\n      if (end == -1) { end = string.length; }\n    }\n    for (var i = startIndex || 0, n = startValue || 0;;) {\n      var nextTab = string.indexOf(\"\\t\", i);\n      if (nextTab < 0 || nextTab >= end)\n        { return n + (end - i) }\n      n += nextTab - i;\n      n += tabSize - (n % tabSize);\n      i = nextTab + 1;\n    }\n  }\n\n  var Delayed = function() {\n    this.id = null;\n    this.f = null;\n    this.time = 0;\n    this.handler = bind(this.onTimeout, this);\n  };\n  Delayed.prototype.onTimeout = function (self) {\n    self.id = 0;\n    if (self.time <= +new Date) {\n      self.f();\n    } else {\n      setTimeout(self.handler, self.time - +new Date);\n    }\n  };\n  Delayed.prototype.set = function (ms, f) {\n    this.f = f;\n    var time = +new Date + ms;\n    if (!this.id || time < this.time) {\n      clearTimeout(this.id);\n      this.id = setTimeout(this.handler, ms);\n      this.time = time;\n    }\n  };\n\n  function indexOf(array, elt) {\n    for (var i = 0; i < array.length; ++i)\n      { if (array[i] == elt) { return i } }\n    return -1\n  }\n\n  // Number of pixels added to scroller and sizer to hide scrollbar\n  var scrollerGap = 50;\n\n  // Returned or thrown by various protocols to signal 'I'm not\n  // handling this'.\n  var Pass = {toString: function(){return \"CodeMirror.Pass\"}};\n\n  // Reused option objects for setSelection & friends\n  var sel_dontScroll = {scroll: false}, sel_mouse = {origin: \"*mouse\"}, sel_move = {origin: \"+move\"};\n\n  // The inverse of countColumn -- find the offset that corresponds to\n  // a particular column.\n  function findColumn(string, goal, tabSize) {\n    for (var pos = 0, col = 0;;) {\n      var nextTab = string.indexOf(\"\\t\", pos);\n      if (nextTab == -1) { nextTab = string.length; }\n      var skipped = nextTab - pos;\n      if (nextTab == string.length || col + skipped >= goal)\n        { return pos + Math.min(skipped, goal - col) }\n      col += nextTab - pos;\n      col += tabSize - (col % tabSize);\n      pos = nextTab + 1;\n      if (col >= goal) { return pos }\n    }\n  }\n\n  var spaceStrs = [\"\"];\n  function spaceStr(n) {\n    while (spaceStrs.length <= n)\n      { spaceStrs.push(lst(spaceStrs) + \" \"); }\n    return spaceStrs[n]\n  }\n\n  function lst(arr) { return arr[arr.length-1] }\n\n  function map(array, f) {\n    var out = [];\n    for (var i = 0; i < array.length; i++) { out[i] = f(array[i], i); }\n    return out\n  }\n\n  function insertSorted(array, value, score) {\n    var pos = 0, priority = score(value);\n    while (pos < array.length && score(array[pos]) <= priority) { pos++; }\n    array.splice(pos, 0, value);\n  }\n\n  function nothing() {}\n\n  function createObj(base, props) {\n    var inst;\n    if (Object.create) {\n      inst = Object.create(base);\n    } else {\n      nothing.prototype = base;\n      inst = new nothing();\n    }\n    if (props) { copyObj(props, inst); }\n    return inst\n  }\n\n  var nonASCIISingleCaseWordChar = /[\\u00df\\u0587\\u0590-\\u05f4\\u0600-\\u06ff\\u3040-\\u309f\\u30a0-\\u30ff\\u3400-\\u4db5\\u4e00-\\u9fcc\\uac00-\\ud7af]/;\n  function isWordCharBasic(ch) {\n    return /\\w/.test(ch) || ch > \"\\x80\" &&\n      (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch))\n  }\n  function isWordChar(ch, helper) {\n    if (!helper) { return isWordCharBasic(ch) }\n    if (helper.source.indexOf(\"\\\\w\") > -1 && isWordCharBasic(ch)) { return true }\n    return helper.test(ch)\n  }\n\n  function isEmpty(obj) {\n    for (var n in obj) { if (obj.hasOwnProperty(n) && obj[n]) { return false } }\n    return true\n  }\n\n  // Extending unicode characters. A series of a non-extending char +\n  // any number of extending chars is treated as a single unit as far\n  // as editing and measuring is concerned. This is not fully correct,\n  // since some scripts/fonts/browsers also treat other configurations\n  // of code points as a group.\n  var extendingChars = /[\\u0300-\\u036f\\u0483-\\u0489\\u0591-\\u05bd\\u05bf\\u05c1\\u05c2\\u05c4\\u05c5\\u05c7\\u0610-\\u061a\\u064b-\\u065e\\u0670\\u06d6-\\u06dc\\u06de-\\u06e4\\u06e7\\u06e8\\u06ea-\\u06ed\\u0711\\u0730-\\u074a\\u07a6-\\u07b0\\u07eb-\\u07f3\\u0816-\\u0819\\u081b-\\u0823\\u0825-\\u0827\\u0829-\\u082d\\u0900-\\u0902\\u093c\\u0941-\\u0948\\u094d\\u0951-\\u0955\\u0962\\u0963\\u0981\\u09bc\\u09be\\u09c1-\\u09c4\\u09cd\\u09d7\\u09e2\\u09e3\\u0a01\\u0a02\\u0a3c\\u0a41\\u0a42\\u0a47\\u0a48\\u0a4b-\\u0a4d\\u0a51\\u0a70\\u0a71\\u0a75\\u0a81\\u0a82\\u0abc\\u0ac1-\\u0ac5\\u0ac7\\u0ac8\\u0acd\\u0ae2\\u0ae3\\u0b01\\u0b3c\\u0b3e\\u0b3f\\u0b41-\\u0b44\\u0b4d\\u0b56\\u0b57\\u0b62\\u0b63\\u0b82\\u0bbe\\u0bc0\\u0bcd\\u0bd7\\u0c3e-\\u0c40\\u0c46-\\u0c48\\u0c4a-\\u0c4d\\u0c55\\u0c56\\u0c62\\u0c63\\u0cbc\\u0cbf\\u0cc2\\u0cc6\\u0ccc\\u0ccd\\u0cd5\\u0cd6\\u0ce2\\u0ce3\\u0d3e\\u0d41-\\u0d44\\u0d4d\\u0d57\\u0d62\\u0d63\\u0dca\\u0dcf\\u0dd2-\\u0dd4\\u0dd6\\u0ddf\\u0e31\\u0e34-\\u0e3a\\u0e47-\\u0e4e\\u0eb1\\u0eb4-\\u0eb9\\u0ebb\\u0ebc\\u0ec8-\\u0ecd\\u0f18\\u0f19\\u0f35\\u0f37\\u0f39\\u0f71-\\u0f7e\\u0f80-\\u0f84\\u0f86\\u0f87\\u0f90-\\u0f97\\u0f99-\\u0fbc\\u0fc6\\u102d-\\u1030\\u1032-\\u1037\\u1039\\u103a\\u103d\\u103e\\u1058\\u1059\\u105e-\\u1060\\u1071-\\u1074\\u1082\\u1085\\u1086\\u108d\\u109d\\u135f\\u1712-\\u1714\\u1732-\\u1734\\u1752\\u1753\\u1772\\u1773\\u17b7-\\u17bd\\u17c6\\u17c9-\\u17d3\\u17dd\\u180b-\\u180d\\u18a9\\u1920-\\u1922\\u1927\\u1928\\u1932\\u1939-\\u193b\\u1a17\\u1a18\\u1a56\\u1a58-\\u1a5e\\u1a60\\u1a62\\u1a65-\\u1a6c\\u1a73-\\u1a7c\\u1a7f\\u1b00-\\u1b03\\u1b34\\u1b36-\\u1b3a\\u1b3c\\u1b42\\u1b6b-\\u1b73\\u1b80\\u1b81\\u1ba2-\\u1ba5\\u1ba8\\u1ba9\\u1c2c-\\u1c33\\u1c36\\u1c37\\u1cd0-\\u1cd2\\u1cd4-\\u1ce0\\u1ce2-\\u1ce8\\u1ced\\u1dc0-\\u1de6\\u1dfd-\\u1dff\\u200c\\u200d\\u20d0-\\u20f0\\u2cef-\\u2cf1\\u2de0-\\u2dff\\u302a-\\u302f\\u3099\\u309a\\ua66f-\\ua672\\ua67c\\ua67d\\ua6f0\\ua6f1\\ua802\\ua806\\ua80b\\ua825\\ua826\\ua8c4\\ua8e0-\\ua8f1\\ua926-\\ua92d\\ua947-\\ua951\\ua980-\\ua982\\ua9b3\\ua9b6-\\ua9b9\\ua9bc\\uaa29-\\uaa2e\\uaa31\\uaa32\\uaa35\\uaa36\\uaa43\\uaa4c\\uaab0\\uaab2-\\uaab4\\uaab7\\uaab8\\uaabe\\uaabf\\uaac1\\uabe5\\uabe8\\uabed\\udc00-\\udfff\\ufb1e\\ufe00-\\ufe0f\\ufe20-\\ufe26\\uff9e\\uff9f]/;\n  function isExtendingChar(ch) { return ch.charCodeAt(0) >= 768 && extendingChars.test(ch) }\n\n  // Returns a number from the range [`0`; `str.length`] unless `pos` is outside that range.\n  function skipExtendingChars(str, pos, dir) {\n    while ((dir < 0 ? pos > 0 : pos < str.length) && isExtendingChar(str.charAt(pos))) { pos += dir; }\n    return pos\n  }\n\n  // Returns the value from the range [`from`; `to`] that satisfies\n  // `pred` and is closest to `from`. Assumes that at least `to`\n  // satisfies `pred`. Supports `from` being greater than `to`.\n  function findFirst(pred, from, to) {\n    // At any point we are certain `to` satisfies `pred`, don't know\n    // whether `from` does.\n    var dir = from > to ? -1 : 1;\n    for (;;) {\n      if (from == to) { return from }\n      var midF = (from + to) / 2, mid = dir < 0 ? Math.ceil(midF) : Math.floor(midF);\n      if (mid == from) { return pred(mid) ? from : to }\n      if (pred(mid)) { to = mid; }\n      else { from = mid + dir; }\n    }\n  }\n\n  // BIDI HELPERS\n\n  function iterateBidiSections(order, from, to, f) {\n    if (!order) { return f(from, to, \"ltr\", 0) }\n    var found = false;\n    for (var i = 0; i < order.length; ++i) {\n      var part = order[i];\n      if (part.from < to && part.to > from || from == to && part.to == from) {\n        f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? \"rtl\" : \"ltr\", i);\n        found = true;\n      }\n    }\n    if (!found) { f(from, to, \"ltr\"); }\n  }\n\n  var bidiOther = null;\n  function getBidiPartAt(order, ch, sticky) {\n    var found;\n    bidiOther = null;\n    for (var i = 0; i < order.length; ++i) {\n      var cur = order[i];\n      if (cur.from < ch && cur.to > ch) { return i }\n      if (cur.to == ch) {\n        if (cur.from != cur.to && sticky == \"before\") { found = i; }\n        else { bidiOther = i; }\n      }\n      if (cur.from == ch) {\n        if (cur.from != cur.to && sticky != \"before\") { found = i; }\n        else { bidiOther = i; }\n      }\n    }\n    return found != null ? found : bidiOther\n  }\n\n  // Bidirectional ordering algorithm\n  // See http://unicode.org/reports/tr9/tr9-13.html for the algorithm\n  // that this (partially) implements.\n\n  // One-char codes used for character types:\n  // L (L):   Left-to-Right\n  // R (R):   Right-to-Left\n  // r (AL):  Right-to-Left Arabic\n  // 1 (EN):  European Number\n  // + (ES):  European Number Separator\n  // % (ET):  European Number Terminator\n  // n (AN):  Arabic Number\n  // , (CS):  Common Number Separator\n  // m (NSM): Non-Spacing Mark\n  // b (BN):  Boundary Neutral\n  // s (B):   Paragraph Separator\n  // t (S):   Segment Separator\n  // w (WS):  Whitespace\n  // N (ON):  Other Neutrals\n\n  // Returns null if characters are ordered as they appear\n  // (left-to-right), or an array of sections ({from, to, level}\n  // objects) in the order in which they occur visually.\n  var bidiOrdering = (function() {\n    // Character types for codepoints 0 to 0xff\n    var lowTypes = \"bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLN\";\n    // Character types for codepoints 0x600 to 0x6f9\n    var arabicTypes = \"nnnnnnNNr%%r,rNNmmmmmmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmmmnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmnNmmmmmmrrmmNmmmmrr1111111111\";\n    function charType(code) {\n      if (code <= 0xf7) { return lowTypes.charAt(code) }\n      else if (0x590 <= code && code <= 0x5f4) { return \"R\" }\n      else if (0x600 <= code && code <= 0x6f9) { return arabicTypes.charAt(code - 0x600) }\n      else if (0x6ee <= code && code <= 0x8ac) { return \"r\" }\n      else if (0x2000 <= code && code <= 0x200b) { return \"w\" }\n      else if (code == 0x200c) { return \"b\" }\n      else { return \"L\" }\n    }\n\n    var bidiRE = /[\\u0590-\\u05f4\\u0600-\\u06ff\\u0700-\\u08ac]/;\n    var isNeutral = /[stwN]/, isStrong = /[LRr]/, countsAsLeft = /[Lb1n]/, countsAsNum = /[1n]/;\n\n    function BidiSpan(level, from, to) {\n      this.level = level;\n      this.from = from; this.to = to;\n    }\n\n    return function(str, direction) {\n      var outerType = direction == \"ltr\" ? \"L\" : \"R\";\n\n      if (str.length == 0 || direction == \"ltr\" && !bidiRE.test(str)) { return false }\n      var len = str.length, types = [];\n      for (var i = 0; i < len; ++i)\n        { types.push(charType(str.charCodeAt(i))); }\n\n      // W1. Examine each non-spacing mark (NSM) in the level run, and\n      // change the type of the NSM to the type of the previous\n      // character. If the NSM is at the start of the level run, it will\n      // get the type of sor.\n      for (var i$1 = 0, prev = outerType; i$1 < len; ++i$1) {\n        var type = types[i$1];\n        if (type == \"m\") { types[i$1] = prev; }\n        else { prev = type; }\n      }\n\n      // W2. Search backwards from each instance of a European number\n      // until the first strong type (R, L, AL, or sor) is found. If an\n      // AL is found, change the type of the European number to Arabic\n      // number.\n      // W3. Change all ALs to R.\n      for (var i$2 = 0, cur = outerType; i$2 < len; ++i$2) {\n        var type$1 = types[i$2];\n        if (type$1 == \"1\" && cur == \"r\") { types[i$2] = \"n\"; }\n        else if (isStrong.test(type$1)) { cur = type$1; if (type$1 == \"r\") { types[i$2] = \"R\"; } }\n      }\n\n      // W4. A single European separator between two European numbers\n      // changes to a European number. A single common separator between\n      // two numbers of the same type changes to that type.\n      for (var i$3 = 1, prev$1 = types[0]; i$3 < len - 1; ++i$3) {\n        var type$2 = types[i$3];\n        if (type$2 == \"+\" && prev$1 == \"1\" && types[i$3+1] == \"1\") { types[i$3] = \"1\"; }\n        else if (type$2 == \",\" && prev$1 == types[i$3+1] &&\n                 (prev$1 == \"1\" || prev$1 == \"n\")) { types[i$3] = prev$1; }\n        prev$1 = type$2;\n      }\n\n      // W5. A sequence of European terminators adjacent to European\n      // numbers changes to all European numbers.\n      // W6. Otherwise, separators and terminators change to Other\n      // Neutral.\n      for (var i$4 = 0; i$4 < len; ++i$4) {\n        var type$3 = types[i$4];\n        if (type$3 == \",\") { types[i$4] = \"N\"; }\n        else if (type$3 == \"%\") {\n          var end = (void 0);\n          for (end = i$4 + 1; end < len && types[end] == \"%\"; ++end) {}\n          var replace = (i$4 && types[i$4-1] == \"!\") || (end < len && types[end] == \"1\") ? \"1\" : \"N\";\n          for (var j = i$4; j < end; ++j) { types[j] = replace; }\n          i$4 = end - 1;\n        }\n      }\n\n      // W7. Search backwards from each instance of a European number\n      // until the first strong type (R, L, or sor) is found. If an L is\n      // found, then change the type of the European number to L.\n      for (var i$5 = 0, cur$1 = outerType; i$5 < len; ++i$5) {\n        var type$4 = types[i$5];\n        if (cur$1 == \"L\" && type$4 == \"1\") { types[i$5] = \"L\"; }\n        else if (isStrong.test(type$4)) { cur$1 = type$4; }\n      }\n\n      // N1. A sequence of neutrals takes the direction of the\n      // surrounding strong text if the text on both sides has the same\n      // direction. European and Arabic numbers act as if they were R in\n      // terms of their influence on neutrals. Start-of-level-run (sor)\n      // and end-of-level-run (eor) are used at level run boundaries.\n      // N2. Any remaining neutrals take the embedding direction.\n      for (var i$6 = 0; i$6 < len; ++i$6) {\n        if (isNeutral.test(types[i$6])) {\n          var end$1 = (void 0);\n          for (end$1 = i$6 + 1; end$1 < len && isNeutral.test(types[end$1]); ++end$1) {}\n          var before = (i$6 ? types[i$6-1] : outerType) == \"L\";\n          var after = (end$1 < len ? types[end$1] : outerType) == \"L\";\n          var replace$1 = before == after ? (before ? \"L\" : \"R\") : outerType;\n          for (var j$1 = i$6; j$1 < end$1; ++j$1) { types[j$1] = replace$1; }\n          i$6 = end$1 - 1;\n        }\n      }\n\n      // Here we depart from the documented algorithm, in order to avoid\n      // building up an actual levels array. Since there are only three\n      // levels (0, 1, 2) in an implementation that doesn't take\n      // explicit embedding into account, we can build up the order on\n      // the fly, without following the level-based algorithm.\n      var order = [], m;\n      for (var i$7 = 0; i$7 < len;) {\n        if (countsAsLeft.test(types[i$7])) {\n          var start = i$7;\n          for (++i$7; i$7 < len && countsAsLeft.test(types[i$7]); ++i$7) {}\n          order.push(new BidiSpan(0, start, i$7));\n        } else {\n          var pos = i$7, at = order.length, isRTL = direction == \"rtl\" ? 1 : 0;\n          for (++i$7; i$7 < len && types[i$7] != \"L\"; ++i$7) {}\n          for (var j$2 = pos; j$2 < i$7;) {\n            if (countsAsNum.test(types[j$2])) {\n              if (pos < j$2) { order.splice(at, 0, new BidiSpan(1, pos, j$2)); at += isRTL; }\n              var nstart = j$2;\n              for (++j$2; j$2 < i$7 && countsAsNum.test(types[j$2]); ++j$2) {}\n              order.splice(at, 0, new BidiSpan(2, nstart, j$2));\n              at += isRTL;\n              pos = j$2;\n            } else { ++j$2; }\n          }\n          if (pos < i$7) { order.splice(at, 0, new BidiSpan(1, pos, i$7)); }\n        }\n      }\n      if (direction == \"ltr\") {\n        if (order[0].level == 1 && (m = str.match(/^\\s+/))) {\n          order[0].from = m[0].length;\n          order.unshift(new BidiSpan(0, 0, m[0].length));\n        }\n        if (lst(order).level == 1 && (m = str.match(/\\s+$/))) {\n          lst(order).to -= m[0].length;\n          order.push(new BidiSpan(0, len - m[0].length, len));\n        }\n      }\n\n      return direction == \"rtl\" ? order.reverse() : order\n    }\n  })();\n\n  // Get the bidi ordering for the given line (and cache it). Returns\n  // false for lines that are fully left-to-right, and an array of\n  // BidiSpan objects otherwise.\n  function getOrder(line, direction) {\n    var order = line.order;\n    if (order == null) { order = line.order = bidiOrdering(line.text, direction); }\n    return order\n  }\n\n  // EVENT HANDLING\n\n  // Lightweight event framework. on/off also work on DOM nodes,\n  // registering native DOM handlers.\n\n  var noHandlers = [];\n\n  var on = function(emitter, type, f) {\n    if (emitter.addEventListener) {\n      emitter.addEventListener(type, f, false);\n    } else if (emitter.attachEvent) {\n      emitter.attachEvent(\"on\" + type, f);\n    } else {\n      var map = emitter._handlers || (emitter._handlers = {});\n      map[type] = (map[type] || noHandlers).concat(f);\n    }\n  };\n\n  function getHandlers(emitter, type) {\n    return emitter._handlers && emitter._handlers[type] || noHandlers\n  }\n\n  function off(emitter, type, f) {\n    if (emitter.removeEventListener) {\n      emitter.removeEventListener(type, f, false);\n    } else if (emitter.detachEvent) {\n      emitter.detachEvent(\"on\" + type, f);\n    } else {\n      var map = emitter._handlers, arr = map && map[type];\n      if (arr) {\n        var index = indexOf(arr, f);\n        if (index > -1)\n          { map[type] = arr.slice(0, index).concat(arr.slice(index + 1)); }\n      }\n    }\n  }\n\n  function signal(emitter, type /*, values...*/) {\n    var handlers = getHandlers(emitter, type);\n    if (!handlers.length) { return }\n    var args = Array.prototype.slice.call(arguments, 2);\n    for (var i = 0; i < handlers.length; ++i) { handlers[i].apply(null, args); }\n  }\n\n  // The DOM events that CodeMirror handles can be overridden by\n  // registering a (non-DOM) handler on the editor for the event name,\n  // and preventDefault-ing the event in that handler.\n  function signalDOMEvent(cm, e, override) {\n    if (typeof e == \"string\")\n      { e = {type: e, preventDefault: function() { this.defaultPrevented = true; }}; }\n    signal(cm, override || e.type, cm, e);\n    return e_defaultPrevented(e) || e.codemirrorIgnore\n  }\n\n  function signalCursorActivity(cm) {\n    var arr = cm._handlers && cm._handlers.cursorActivity;\n    if (!arr) { return }\n    var set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = []);\n    for (var i = 0; i < arr.length; ++i) { if (indexOf(set, arr[i]) == -1)\n      { set.push(arr[i]); } }\n  }\n\n  function hasHandler(emitter, type) {\n    return getHandlers(emitter, type).length > 0\n  }\n\n  // Add on and off methods to a constructor's prototype, to make\n  // registering events on such objects more convenient.\n  function eventMixin(ctor) {\n    ctor.prototype.on = function(type, f) {on(this, type, f);};\n    ctor.prototype.off = function(type, f) {off(this, type, f);};\n  }\n\n  // Due to the fact that we still support jurassic IE versions, some\n  // compatibility wrappers are needed.\n\n  function e_preventDefault(e) {\n    if (e.preventDefault) { e.preventDefault(); }\n    else { e.returnValue = false; }\n  }\n  function e_stopPropagation(e) {\n    if (e.stopPropagation) { e.stopPropagation(); }\n    else { e.cancelBubble = true; }\n  }\n  function e_defaultPrevented(e) {\n    return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false\n  }\n  function e_stop(e) {e_preventDefault(e); e_stopPropagation(e);}\n\n  function e_target(e) {return e.target || e.srcElement}\n  function e_button(e) {\n    var b = e.which;\n    if (b == null) {\n      if (e.button & 1) { b = 1; }\n      else if (e.button & 2) { b = 3; }\n      else if (e.button & 4) { b = 2; }\n    }\n    if (mac && e.ctrlKey && b == 1) { b = 3; }\n    return b\n  }\n\n  // Detect drag-and-drop\n  var dragAndDrop = function() {\n    // There is *some* kind of drag-and-drop support in IE6-8, but I\n    // couldn't get it to work yet.\n    if (ie && ie_version < 9) { return false }\n    var div = elt('div');\n    return \"draggable\" in div || \"dragDrop\" in div\n  }();\n\n  var zwspSupported;\n  function zeroWidthElement(measure) {\n    if (zwspSupported == null) {\n      var test = elt(\"span\", \"\\u200b\");\n      removeChildrenAndAdd(measure, elt(\"span\", [test, document.createTextNode(\"x\")]));\n      if (measure.firstChild.offsetHeight != 0)\n        { zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !(ie && ie_version < 8); }\n    }\n    var node = zwspSupported ? elt(\"span\", \"\\u200b\") :\n      elt(\"span\", \"\\u00a0\", null, \"display: inline-block; width: 1px; margin-right: -1px\");\n    node.setAttribute(\"cm-text\", \"\");\n    return node\n  }\n\n  // Feature-detect IE's crummy client rect reporting for bidi text\n  var badBidiRects;\n  function hasBadBidiRects(measure) {\n    if (badBidiRects != null) { return badBidiRects }\n    var txt = removeChildrenAndAdd(measure, document.createTextNode(\"A\\u062eA\"));\n    var r0 = range(txt, 0, 1).getBoundingClientRect();\n    var r1 = range(txt, 1, 2).getBoundingClientRect();\n    removeChildren(measure);\n    if (!r0 || r0.left == r0.right) { return false } // Safari returns null in some cases (#2780)\n    return badBidiRects = (r1.right - r0.right < 3)\n  }\n\n  // See if \"\".split is the broken IE version, if so, provide an\n  // alternative way to split lines.\n  var splitLinesAuto = \"\\n\\nb\".split(/\\n/).length != 3 ? function (string) {\n    var pos = 0, result = [], l = string.length;\n    while (pos <= l) {\n      var nl = string.indexOf(\"\\n\", pos);\n      if (nl == -1) { nl = string.length; }\n      var line = string.slice(pos, string.charAt(nl - 1) == \"\\r\" ? nl - 1 : nl);\n      var rt = line.indexOf(\"\\r\");\n      if (rt != -1) {\n        result.push(line.slice(0, rt));\n        pos += rt + 1;\n      } else {\n        result.push(line);\n        pos = nl + 1;\n      }\n    }\n    return result\n  } : function (string) { return string.split(/\\r\\n?|\\n/); };\n\n  var hasSelection = window.getSelection ? function (te) {\n    try { return te.selectionStart != te.selectionEnd }\n    catch(e) { return false }\n  } : function (te) {\n    var range;\n    try {range = te.ownerDocument.selection.createRange();}\n    catch(e) {}\n    if (!range || range.parentElement() != te) { return false }\n    return range.compareEndPoints(\"StartToEnd\", range) != 0\n  };\n\n  var hasCopyEvent = (function () {\n    var e = elt(\"div\");\n    if (\"oncopy\" in e) { return true }\n    e.setAttribute(\"oncopy\", \"return;\");\n    return typeof e.oncopy == \"function\"\n  })();\n\n  var badZoomedRects = null;\n  function hasBadZoomedRects(measure) {\n    if (badZoomedRects != null) { return badZoomedRects }\n    var node = removeChildrenAndAdd(measure, elt(\"span\", \"x\"));\n    var normal = node.getBoundingClientRect();\n    var fromRange = range(node, 0, 1).getBoundingClientRect();\n    return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1\n  }\n\n  // Known modes, by name and by MIME\n  var modes = {}, mimeModes = {};\n\n  // Extra arguments are stored as the mode's dependencies, which is\n  // used by (legacy) mechanisms like loadmode.js to automatically\n  // load a mode. (Preferred mechanism is the require/define calls.)\n  function defineMode(name, mode) {\n    if (arguments.length > 2)\n      { mode.dependencies = Array.prototype.slice.call(arguments, 2); }\n    modes[name] = mode;\n  }\n\n  function defineMIME(mime, spec) {\n    mimeModes[mime] = spec;\n  }\n\n  // Given a MIME type, a {name, ...options} config object, or a name\n  // string, return a mode config object.\n  function resolveMode(spec) {\n    if (typeof spec == \"string\" && mimeModes.hasOwnProperty(spec)) {\n      spec = mimeModes[spec];\n    } else if (spec && typeof spec.name == \"string\" && mimeModes.hasOwnProperty(spec.name)) {\n      var found = mimeModes[spec.name];\n      if (typeof found == \"string\") { found = {name: found}; }\n      spec = createObj(found, spec);\n      spec.name = found.name;\n    } else if (typeof spec == \"string\" && /^[\\w\\-]+\\/[\\w\\-]+\\+xml$/.test(spec)) {\n      return resolveMode(\"application/xml\")\n    } else if (typeof spec == \"string\" && /^[\\w\\-]+\\/[\\w\\-]+\\+json$/.test(spec)) {\n      return resolveMode(\"application/json\")\n    }\n    if (typeof spec == \"string\") { return {name: spec} }\n    else { return spec || {name: \"null\"} }\n  }\n\n  // Given a mode spec (anything that resolveMode accepts), find and\n  // initialize an actual mode object.\n  function getMode(options, spec) {\n    spec = resolveMode(spec);\n    var mfactory = modes[spec.name];\n    if (!mfactory) { return getMode(options, \"text/plain\") }\n    var modeObj = mfactory(options, spec);\n    if (modeExtensions.hasOwnProperty(spec.name)) {\n      var exts = modeExtensions[spec.name];\n      for (var prop in exts) {\n        if (!exts.hasOwnProperty(prop)) { continue }\n        if (modeObj.hasOwnProperty(prop)) { modeObj[\"_\" + prop] = modeObj[prop]; }\n        modeObj[prop] = exts[prop];\n      }\n    }\n    modeObj.name = spec.name;\n    if (spec.helperType) { modeObj.helperType = spec.helperType; }\n    if (spec.modeProps) { for (var prop$1 in spec.modeProps)\n      { modeObj[prop$1] = spec.modeProps[prop$1]; } }\n\n    return modeObj\n  }\n\n  // This can be used to attach properties to mode objects from\n  // outside the actual mode definition.\n  var modeExtensions = {};\n  function extendMode(mode, properties) {\n    var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {});\n    copyObj(properties, exts);\n  }\n\n  function copyState(mode, state) {\n    if (state === true) { return state }\n    if (mode.copyState) { return mode.copyState(state) }\n    var nstate = {};\n    for (var n in state) {\n      var val = state[n];\n      if (val instanceof Array) { val = val.concat([]); }\n      nstate[n] = val;\n    }\n    return nstate\n  }\n\n  // Given a mode and a state (for that mode), find the inner mode and\n  // state at the position that the state refers to.\n  function innerMode(mode, state) {\n    var info;\n    while (mode.innerMode) {\n      info = mode.innerMode(state);\n      if (!info || info.mode == mode) { break }\n      state = info.state;\n      mode = info.mode;\n    }\n    return info || {mode: mode, state: state}\n  }\n\n  function startState(mode, a1, a2) {\n    return mode.startState ? mode.startState(a1, a2) : true\n  }\n\n  // STRING STREAM\n\n  // Fed to the mode parsers, provides helper functions to make\n  // parsers more succinct.\n\n  var StringStream = function(string, tabSize, lineOracle) {\n    this.pos = this.start = 0;\n    this.string = string;\n    this.tabSize = tabSize || 8;\n    this.lastColumnPos = this.lastColumnValue = 0;\n    this.lineStart = 0;\n    this.lineOracle = lineOracle;\n  };\n\n  StringStream.prototype.eol = function () {return this.pos >= this.string.length};\n  StringStream.prototype.sol = function () {return this.pos == this.lineStart};\n  StringStream.prototype.peek = function () {return this.string.charAt(this.pos) || undefined};\n  StringStream.prototype.next = function () {\n    if (this.pos < this.string.length)\n      { return this.string.charAt(this.pos++) }\n  };\n  StringStream.prototype.eat = function (match) {\n    var ch = this.string.charAt(this.pos);\n    var ok;\n    if (typeof match == \"string\") { ok = ch == match; }\n    else { ok = ch && (match.test ? match.test(ch) : match(ch)); }\n    if (ok) {++this.pos; return ch}\n  };\n  StringStream.prototype.eatWhile = function (match) {\n    var start = this.pos;\n    while (this.eat(match)){}\n    return this.pos > start\n  };\n  StringStream.prototype.eatSpace = function () {\n    var start = this.pos;\n    while (/[\\s\\u00a0]/.test(this.string.charAt(this.pos))) { ++this.pos; }\n    return this.pos > start\n  };\n  StringStream.prototype.skipToEnd = function () {this.pos = this.string.length;};\n  StringStream.prototype.skipTo = function (ch) {\n    var found = this.string.indexOf(ch, this.pos);\n    if (found > -1) {this.pos = found; return true}\n  };\n  StringStream.prototype.backUp = function (n) {this.pos -= n;};\n  StringStream.prototype.column = function () {\n    if (this.lastColumnPos < this.start) {\n      this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue);\n      this.lastColumnPos = this.start;\n    }\n    return this.lastColumnValue - (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)\n  };\n  StringStream.prototype.indentation = function () {\n    return countColumn(this.string, null, this.tabSize) -\n      (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)\n  };\n  StringStream.prototype.match = function (pattern, consume, caseInsensitive) {\n    if (typeof pattern == \"string\") {\n      var cased = function (str) { return caseInsensitive ? str.toLowerCase() : str; };\n      var substr = this.string.substr(this.pos, pattern.length);\n      if (cased(substr) == cased(pattern)) {\n        if (consume !== false) { this.pos += pattern.length; }\n        return true\n      }\n    } else {\n      var match = this.string.slice(this.pos).match(pattern);\n      if (match && match.index > 0) { return null }\n      if (match && consume !== false) { this.pos += match[0].length; }\n      return match\n    }\n  };\n  StringStream.prototype.current = function (){return this.string.slice(this.start, this.pos)};\n  StringStream.prototype.hideFirstChars = function (n, inner) {\n    this.lineStart += n;\n    try { return inner() }\n    finally { this.lineStart -= n; }\n  };\n  StringStream.prototype.lookAhead = function (n) {\n    var oracle = this.lineOracle;\n    return oracle && oracle.lookAhead(n)\n  };\n  StringStream.prototype.baseToken = function () {\n    var oracle = this.lineOracle;\n    return oracle && oracle.baseToken(this.pos)\n  };\n\n  // Find the line object corresponding to the given line number.\n  function getLine(doc, n) {\n    n -= doc.first;\n    if (n < 0 || n >= doc.size) { throw new Error(\"There is no line \" + (n + doc.first) + \" in the document.\") }\n    var chunk = doc;\n    while (!chunk.lines) {\n      for (var i = 0;; ++i) {\n        var child = chunk.children[i], sz = child.chunkSize();\n        if (n < sz) { chunk = child; break }\n        n -= sz;\n      }\n    }\n    return chunk.lines[n]\n  }\n\n  // Get the part of a document between two positions, as an array of\n  // strings.\n  function getBetween(doc, start, end) {\n    var out = [], n = start.line;\n    doc.iter(start.line, end.line + 1, function (line) {\n      var text = line.text;\n      if (n == end.line) { text = text.slice(0, end.ch); }\n      if (n == start.line) { text = text.slice(start.ch); }\n      out.push(text);\n      ++n;\n    });\n    return out\n  }\n  // Get the lines between from and to, as array of strings.\n  function getLines(doc, from, to) {\n    var out = [];\n    doc.iter(from, to, function (line) { out.push(line.text); }); // iter aborts when callback returns truthy value\n    return out\n  }\n\n  // Update the height of a line, propagating the height change\n  // upwards to parent nodes.\n  function updateLineHeight(line, height) {\n    var diff = height - line.height;\n    if (diff) { for (var n = line; n; n = n.parent) { n.height += diff; } }\n  }\n\n  // Given a line object, find its line number by walking up through\n  // its parent links.\n  function lineNo(line) {\n    if (line.parent == null) { return null }\n    var cur = line.parent, no = indexOf(cur.lines, line);\n    for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {\n      for (var i = 0;; ++i) {\n        if (chunk.children[i] == cur) { break }\n        no += chunk.children[i].chunkSize();\n      }\n    }\n    return no + cur.first\n  }\n\n  // Find the line at the given vertical position, using the height\n  // information in the document tree.\n  function lineAtHeight(chunk, h) {\n    var n = chunk.first;\n    outer: do {\n      for (var i$1 = 0; i$1 < chunk.children.length; ++i$1) {\n        var child = chunk.children[i$1], ch = child.height;\n        if (h < ch) { chunk = child; continue outer }\n        h -= ch;\n        n += child.chunkSize();\n      }\n      return n\n    } while (!chunk.lines)\n    var i = 0;\n    for (; i < chunk.lines.length; ++i) {\n      var line = chunk.lines[i], lh = line.height;\n      if (h < lh) { break }\n      h -= lh;\n    }\n    return n + i\n  }\n\n  function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size}\n\n  function lineNumberFor(options, i) {\n    return String(options.lineNumberFormatter(i + options.firstLineNumber))\n  }\n\n  // A Pos instance represents a position within the text.\n  function Pos(line, ch, sticky) {\n    if ( sticky === void 0 ) sticky = null;\n\n    if (!(this instanceof Pos)) { return new Pos(line, ch, sticky) }\n    this.line = line;\n    this.ch = ch;\n    this.sticky = sticky;\n  }\n\n  // Compare two positions, return 0 if they are the same, a negative\n  // number when a is less, and a positive number otherwise.\n  function cmp(a, b) { return a.line - b.line || a.ch - b.ch }\n\n  function equalCursorPos(a, b) { return a.sticky == b.sticky && cmp(a, b) == 0 }\n\n  function copyPos(x) {return Pos(x.line, x.ch)}\n  function maxPos(a, b) { return cmp(a, b) < 0 ? b : a }\n  function minPos(a, b) { return cmp(a, b) < 0 ? a : b }\n\n  // Most of the external API clips given positions to make sure they\n  // actually exist within the document.\n  function clipLine(doc, n) {return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1))}\n  function clipPos(doc, pos) {\n    if (pos.line < doc.first) { return Pos(doc.first, 0) }\n    var last = doc.first + doc.size - 1;\n    if (pos.line > last) { return Pos(last, getLine(doc, last).text.length) }\n    return clipToLen(pos, getLine(doc, pos.line).text.length)\n  }\n  function clipToLen(pos, linelen) {\n    var ch = pos.ch;\n    if (ch == null || ch > linelen) { return Pos(pos.line, linelen) }\n    else if (ch < 0) { return Pos(pos.line, 0) }\n    else { return pos }\n  }\n  function clipPosArray(doc, array) {\n    var out = [];\n    for (var i = 0; i < array.length; i++) { out[i] = clipPos(doc, array[i]); }\n    return out\n  }\n\n  var SavedContext = function(state, lookAhead) {\n    this.state = state;\n    this.lookAhead = lookAhead;\n  };\n\n  var Context = function(doc, state, line, lookAhead) {\n    this.state = state;\n    this.doc = doc;\n    this.line = line;\n    this.maxLookAhead = lookAhead || 0;\n    this.baseTokens = null;\n    this.baseTokenPos = 1;\n  };\n\n  Context.prototype.lookAhead = function (n) {\n    var line = this.doc.getLine(this.line + n);\n    if (line != null && n > this.maxLookAhead) { this.maxLookAhead = n; }\n    return line\n  };\n\n  Context.prototype.baseToken = function (n) {\n    if (!this.baseTokens) { return null }\n    while (this.baseTokens[this.baseTokenPos] <= n)\n      { this.baseTokenPos += 2; }\n    var type = this.baseTokens[this.baseTokenPos + 1];\n    return {type: type && type.replace(/( |^)overlay .*/, \"\"),\n            size: this.baseTokens[this.baseTokenPos] - n}\n  };\n\n  Context.prototype.nextLine = function () {\n    this.line++;\n    if (this.maxLookAhead > 0) { this.maxLookAhead--; }\n  };\n\n  Context.fromSaved = function (doc, saved, line) {\n    if (saved instanceof SavedContext)\n      { return new Context(doc, copyState(doc.mode, saved.state), line, saved.lookAhead) }\n    else\n      { return new Context(doc, copyState(doc.mode, saved), line) }\n  };\n\n  Context.prototype.save = function (copy) {\n    var state = copy !== false ? copyState(this.doc.mode, this.state) : this.state;\n    return this.maxLookAhead > 0 ? new SavedContext(state, this.maxLookAhead) : state\n  };\n\n\n  // Compute a style array (an array starting with a mode generation\n  // -- for invalidation -- followed by pairs of end positions and\n  // style strings), which is used to highlight the tokens on the\n  // line.\n  function highlightLine(cm, line, context, forceToEnd) {\n    // A styles array always starts with a number identifying the\n    // mode/overlays that it is based on (for easy invalidation).\n    var st = [cm.state.modeGen], lineClasses = {};\n    // Compute the base array of styles\n    runMode(cm, line.text, cm.doc.mode, context, function (end, style) { return st.push(end, style); },\n            lineClasses, forceToEnd);\n    var state = context.state;\n\n    // Run overlays, adjust style array.\n    var loop = function ( o ) {\n      context.baseTokens = st;\n      var overlay = cm.state.overlays[o], i = 1, at = 0;\n      context.state = true;\n      runMode(cm, line.text, overlay.mode, context, function (end, style) {\n        var start = i;\n        // Ensure there's a token end at the current position, and that i points at it\n        while (at < end) {\n          var i_end = st[i];\n          if (i_end > end)\n            { st.splice(i, 1, end, st[i+1], i_end); }\n          i += 2;\n          at = Math.min(end, i_end);\n        }\n        if (!style) { return }\n        if (overlay.opaque) {\n          st.splice(start, i - start, end, \"overlay \" + style);\n          i = start + 2;\n        } else {\n          for (; start < i; start += 2) {\n            var cur = st[start+1];\n            st[start+1] = (cur ? cur + \" \" : \"\") + \"overlay \" + style;\n          }\n        }\n      }, lineClasses);\n      context.state = state;\n      context.baseTokens = null;\n      context.baseTokenPos = 1;\n    };\n\n    for (var o = 0; o < cm.state.overlays.length; ++o) loop( o );\n\n    return {styles: st, classes: lineClasses.bgClass || lineClasses.textClass ? lineClasses : null}\n  }\n\n  function getLineStyles(cm, line, updateFrontier) {\n    if (!line.styles || line.styles[0] != cm.state.modeGen) {\n      var context = getContextBefore(cm, lineNo(line));\n      var resetState = line.text.length > cm.options.maxHighlightLength && copyState(cm.doc.mode, context.state);\n      var result = highlightLine(cm, line, context);\n      if (resetState) { context.state = resetState; }\n      line.stateAfter = context.save(!resetState);\n      line.styles = result.styles;\n      if (result.classes) { line.styleClasses = result.classes; }\n      else if (line.styleClasses) { line.styleClasses = null; }\n      if (updateFrontier === cm.doc.highlightFrontier)\n        { cm.doc.modeFrontier = Math.max(cm.doc.modeFrontier, ++cm.doc.highlightFrontier); }\n    }\n    return line.styles\n  }\n\n  function getContextBefore(cm, n, precise) {\n    var doc = cm.doc, display = cm.display;\n    if (!doc.mode.startState) { return new Context(doc, true, n) }\n    var start = findStartLine(cm, n, precise);\n    var saved = start > doc.first && getLine(doc, start - 1).stateAfter;\n    var context = saved ? Context.fromSaved(doc, saved, start) : new Context(doc, startState(doc.mode), start);\n\n    doc.iter(start, n, function (line) {\n      processLine(cm, line.text, context);\n      var pos = context.line;\n      line.stateAfter = pos == n - 1 || pos % 5 == 0 || pos >= display.viewFrom && pos < display.viewTo ? context.save() : null;\n      context.nextLine();\n    });\n    if (precise) { doc.modeFrontier = context.line; }\n    return context\n  }\n\n  // Lightweight form of highlight -- proceed over this line and\n  // update state, but don't save a style array. Used for lines that\n  // aren't currently visible.\n  function processLine(cm, text, context, startAt) {\n    var mode = cm.doc.mode;\n    var stream = new StringStream(text, cm.options.tabSize, context);\n    stream.start = stream.pos = startAt || 0;\n    if (text == \"\") { callBlankLine(mode, context.state); }\n    while (!stream.eol()) {\n      readToken(mode, stream, context.state);\n      stream.start = stream.pos;\n    }\n  }\n\n  function callBlankLine(mode, state) {\n    if (mode.blankLine) { return mode.blankLine(state) }\n    if (!mode.innerMode) { return }\n    var inner = innerMode(mode, state);\n    if (inner.mode.blankLine) { return inner.mode.blankLine(inner.state) }\n  }\n\n  function readToken(mode, stream, state, inner) {\n    for (var i = 0; i < 10; i++) {\n      if (inner) { inner[0] = innerMode(mode, state).mode; }\n      var style = mode.token(stream, state);\n      if (stream.pos > stream.start) { return style }\n    }\n    throw new Error(\"Mode \" + mode.name + \" failed to advance stream.\")\n  }\n\n  var Token = function(stream, type, state) {\n    this.start = stream.start; this.end = stream.pos;\n    this.string = stream.current();\n    this.type = type || null;\n    this.state = state;\n  };\n\n  // Utility for getTokenAt and getLineTokens\n  function takeToken(cm, pos, precise, asArray) {\n    var doc = cm.doc, mode = doc.mode, style;\n    pos = clipPos(doc, pos);\n    var line = getLine(doc, pos.line), context = getContextBefore(cm, pos.line, precise);\n    var stream = new StringStream(line.text, cm.options.tabSize, context), tokens;\n    if (asArray) { tokens = []; }\n    while ((asArray || stream.pos < pos.ch) && !stream.eol()) {\n      stream.start = stream.pos;\n      style = readToken(mode, stream, context.state);\n      if (asArray) { tokens.push(new Token(stream, style, copyState(doc.mode, context.state))); }\n    }\n    return asArray ? tokens : new Token(stream, style, context.state)\n  }\n\n  function extractLineClasses(type, output) {\n    if (type) { for (;;) {\n      var lineClass = type.match(/(?:^|\\s+)line-(background-)?(\\S+)/);\n      if (!lineClass) { break }\n      type = type.slice(0, lineClass.index) + type.slice(lineClass.index + lineClass[0].length);\n      var prop = lineClass[1] ? \"bgClass\" : \"textClass\";\n      if (output[prop] == null)\n        { output[prop] = lineClass[2]; }\n      else if (!(new RegExp(\"(?:^|\\\\s)\" + lineClass[2] + \"(?:$|\\\\s)\")).test(output[prop]))\n        { output[prop] += \" \" + lineClass[2]; }\n    } }\n    return type\n  }\n\n  // Run the given mode's parser over a line, calling f for each token.\n  function runMode(cm, text, mode, context, f, lineClasses, forceToEnd) {\n    var flattenSpans = mode.flattenSpans;\n    if (flattenSpans == null) { flattenSpans = cm.options.flattenSpans; }\n    var curStart = 0, curStyle = null;\n    var stream = new StringStream(text, cm.options.tabSize, context), style;\n    var inner = cm.options.addModeClass && [null];\n    if (text == \"\") { extractLineClasses(callBlankLine(mode, context.state), lineClasses); }\n    while (!stream.eol()) {\n      if (stream.pos > cm.options.maxHighlightLength) {\n        flattenSpans = false;\n        if (forceToEnd) { processLine(cm, text, context, stream.pos); }\n        stream.pos = text.length;\n        style = null;\n      } else {\n        style = extractLineClasses(readToken(mode, stream, context.state, inner), lineClasses);\n      }\n      if (inner) {\n        var mName = inner[0].name;\n        if (mName) { style = \"m-\" + (style ? mName + \" \" + style : mName); }\n      }\n      if (!flattenSpans || curStyle != style) {\n        while (curStart < stream.start) {\n          curStart = Math.min(stream.start, curStart + 5000);\n          f(curStart, curStyle);\n        }\n        curStyle = style;\n      }\n      stream.start = stream.pos;\n    }\n    while (curStart < stream.pos) {\n      // Webkit seems to refuse to render text nodes longer than 57444\n      // characters, and returns inaccurate measurements in nodes\n      // starting around 5000 chars.\n      var pos = Math.min(stream.pos, curStart + 5000);\n      f(pos, curStyle);\n      curStart = pos;\n    }\n  }\n\n  // Finds the line to start with when starting a parse. Tries to\n  // find a line with a stateAfter, so that it can start with a\n  // valid state. If that fails, it returns the line with the\n  // smallest indentation, which tends to need the least context to\n  // parse correctly.\n  function findStartLine(cm, n, precise) {\n    var minindent, minline, doc = cm.doc;\n    var lim = precise ? -1 : n - (cm.doc.mode.innerMode ? 1000 : 100);\n    for (var search = n; search > lim; --search) {\n      if (search <= doc.first) { return doc.first }\n      var line = getLine(doc, search - 1), after = line.stateAfter;\n      if (after && (!precise || search + (after instanceof SavedContext ? after.lookAhead : 0) <= doc.modeFrontier))\n        { return search }\n      var indented = countColumn(line.text, null, cm.options.tabSize);\n      if (minline == null || minindent > indented) {\n        minline = search - 1;\n        minindent = indented;\n      }\n    }\n    return minline\n  }\n\n  function retreatFrontier(doc, n) {\n    doc.modeFrontier = Math.min(doc.modeFrontier, n);\n    if (doc.highlightFrontier < n - 10) { return }\n    var start = doc.first;\n    for (var line = n - 1; line > start; line--) {\n      var saved = getLine(doc, line).stateAfter;\n      // change is on 3\n      // state on line 1 looked ahead 2 -- so saw 3\n      // test 1 + 2 < 3 should cover this\n      if (saved && (!(saved instanceof SavedContext) || line + saved.lookAhead < n)) {\n        start = line + 1;\n        break\n      }\n    }\n    doc.highlightFrontier = Math.min(doc.highlightFrontier, start);\n  }\n\n  // Optimize some code when these features are not used.\n  var sawReadOnlySpans = false, sawCollapsedSpans = false;\n\n  function seeReadOnlySpans() {\n    sawReadOnlySpans = true;\n  }\n\n  function seeCollapsedSpans() {\n    sawCollapsedSpans = true;\n  }\n\n  // TEXTMARKER SPANS\n\n  function MarkedSpan(marker, from, to) {\n    this.marker = marker;\n    this.from = from; this.to = to;\n  }\n\n  // Search an array of spans for a span matching the given marker.\n  function getMarkedSpanFor(spans, marker) {\n    if (spans) { for (var i = 0; i < spans.length; ++i) {\n      var span = spans[i];\n      if (span.marker == marker) { return span }\n    } }\n  }\n  // Remove a span from an array, returning undefined if no spans are\n  // left (we don't store arrays for lines without spans).\n  function removeMarkedSpan(spans, span) {\n    var r;\n    for (var i = 0; i < spans.length; ++i)\n      { if (spans[i] != span) { (r || (r = [])).push(spans[i]); } }\n    return r\n  }\n  // Add a span to a line.\n  function addMarkedSpan(line, span) {\n    line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span];\n    span.marker.attachLine(line);\n  }\n\n  // Used for the algorithm that adjusts markers for a change in the\n  // document. These functions cut an array of spans at a given\n  // character position, returning an array of remaining chunks (or\n  // undefined if nothing remains).\n  function markedSpansBefore(old, startCh, isInsert) {\n    var nw;\n    if (old) { for (var i = 0; i < old.length; ++i) {\n      var span = old[i], marker = span.marker;\n      var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);\n      if (startsBefore || span.from == startCh && marker.type == \"bookmark\" && (!isInsert || !span.marker.insertLeft)) {\n        var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh)\n        ;(nw || (nw = [])).push(new MarkedSpan(marker, span.from, endsAfter ? null : span.to));\n      }\n    } }\n    return nw\n  }\n  function markedSpansAfter(old, endCh, isInsert) {\n    var nw;\n    if (old) { for (var i = 0; i < old.length; ++i) {\n      var span = old[i], marker = span.marker;\n      var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);\n      if (endsAfter || span.from == endCh && marker.type == \"bookmark\" && (!isInsert || span.marker.insertLeft)) {\n        var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh)\n        ;(nw || (nw = [])).push(new MarkedSpan(marker, startsBefore ? null : span.from - endCh,\n                                              span.to == null ? null : span.to - endCh));\n      }\n    } }\n    return nw\n  }\n\n  // Given a change object, compute the new set of marker spans that\n  // cover the line in which the change took place. Removes spans\n  // entirely within the change, reconnects spans belonging to the\n  // same marker that appear on both sides of the change, and cuts off\n  // spans partially within the change. Returns an array of span\n  // arrays with one element for each line in (after) the change.\n  function stretchSpansOverChange(doc, change) {\n    if (change.full) { return null }\n    var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans;\n    var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans;\n    if (!oldFirst && !oldLast) { return null }\n\n    var startCh = change.from.ch, endCh = change.to.ch, isInsert = cmp(change.from, change.to) == 0;\n    // Get the spans that 'stick out' on both sides\n    var first = markedSpansBefore(oldFirst, startCh, isInsert);\n    var last = markedSpansAfter(oldLast, endCh, isInsert);\n\n    // Next, merge those two ends\n    var sameLine = change.text.length == 1, offset = lst(change.text).length + (sameLine ? startCh : 0);\n    if (first) {\n      // Fix up .to properties of first\n      for (var i = 0; i < first.length; ++i) {\n        var span = first[i];\n        if (span.to == null) {\n          var found = getMarkedSpanFor(last, span.marker);\n          if (!found) { span.to = startCh; }\n          else if (sameLine) { span.to = found.to == null ? null : found.to + offset; }\n        }\n      }\n    }\n    if (last) {\n      // Fix up .from in last (or move them into first in case of sameLine)\n      for (var i$1 = 0; i$1 < last.length; ++i$1) {\n        var span$1 = last[i$1];\n        if (span$1.to != null) { span$1.to += offset; }\n        if (span$1.from == null) {\n          var found$1 = getMarkedSpanFor(first, span$1.marker);\n          if (!found$1) {\n            span$1.from = offset;\n            if (sameLine) { (first || (first = [])).push(span$1); }\n          }\n        } else {\n          span$1.from += offset;\n          if (sameLine) { (first || (first = [])).push(span$1); }\n        }\n      }\n    }\n    // Make sure we didn't create any zero-length spans\n    if (first) { first = clearEmptySpans(first); }\n    if (last && last != first) { last = clearEmptySpans(last); }\n\n    var newMarkers = [first];\n    if (!sameLine) {\n      // Fill gap with whole-line-spans\n      var gap = change.text.length - 2, gapMarkers;\n      if (gap > 0 && first)\n        { for (var i$2 = 0; i$2 < first.length; ++i$2)\n          { if (first[i$2].to == null)\n            { (gapMarkers || (gapMarkers = [])).push(new MarkedSpan(first[i$2].marker, null, null)); } } }\n      for (var i$3 = 0; i$3 < gap; ++i$3)\n        { newMarkers.push(gapMarkers); }\n      newMarkers.push(last);\n    }\n    return newMarkers\n  }\n\n  // Remove spans that are empty and don't have a clearWhenEmpty\n  // option of false.\n  function clearEmptySpans(spans) {\n    for (var i = 0; i < spans.length; ++i) {\n      var span = spans[i];\n      if (span.from != null && span.from == span.to && span.marker.clearWhenEmpty !== false)\n        { spans.splice(i--, 1); }\n    }\n    if (!spans.length) { return null }\n    return spans\n  }\n\n  // Used to 'clip' out readOnly ranges when making a change.\n  function removeReadOnlyRanges(doc, from, to) {\n    var markers = null;\n    doc.iter(from.line, to.line + 1, function (line) {\n      if (line.markedSpans) { for (var i = 0; i < line.markedSpans.length; ++i) {\n        var mark = line.markedSpans[i].marker;\n        if (mark.readOnly && (!markers || indexOf(markers, mark) == -1))\n          { (markers || (markers = [])).push(mark); }\n      } }\n    });\n    if (!markers) { return null }\n    var parts = [{from: from, to: to}];\n    for (var i = 0; i < markers.length; ++i) {\n      var mk = markers[i], m = mk.find(0);\n      for (var j = 0; j < parts.length; ++j) {\n        var p = parts[j];\n        if (cmp(p.to, m.from) < 0 || cmp(p.from, m.to) > 0) { continue }\n        var newParts = [j, 1], dfrom = cmp(p.from, m.from), dto = cmp(p.to, m.to);\n        if (dfrom < 0 || !mk.inclusiveLeft && !dfrom)\n          { newParts.push({from: p.from, to: m.from}); }\n        if (dto > 0 || !mk.inclusiveRight && !dto)\n          { newParts.push({from: m.to, to: p.to}); }\n        parts.splice.apply(parts, newParts);\n        j += newParts.length - 3;\n      }\n    }\n    return parts\n  }\n\n  // Connect or disconnect spans from a line.\n  function detachMarkedSpans(line) {\n    var spans = line.markedSpans;\n    if (!spans) { return }\n    for (var i = 0; i < spans.length; ++i)\n      { spans[i].marker.detachLine(line); }\n    line.markedSpans = null;\n  }\n  function attachMarkedSpans(line, spans) {\n    if (!spans) { return }\n    for (var i = 0; i < spans.length; ++i)\n      { spans[i].marker.attachLine(line); }\n    line.markedSpans = spans;\n  }\n\n  // Helpers used when computing which overlapping collapsed span\n  // counts as the larger one.\n  function extraLeft(marker) { return marker.inclusiveLeft ? -1 : 0 }\n  function extraRight(marker) { return marker.inclusiveRight ? 1 : 0 }\n\n  // Returns a number indicating which of two overlapping collapsed\n  // spans is larger (and thus includes the other). Falls back to\n  // comparing ids when the spans cover exactly the same range.\n  function compareCollapsedMarkers(a, b) {\n    var lenDiff = a.lines.length - b.lines.length;\n    if (lenDiff != 0) { return lenDiff }\n    var aPos = a.find(), bPos = b.find();\n    var fromCmp = cmp(aPos.from, bPos.from) || extraLeft(a) - extraLeft(b);\n    if (fromCmp) { return -fromCmp }\n    var toCmp = cmp(aPos.to, bPos.to) || extraRight(a) - extraRight(b);\n    if (toCmp) { return toCmp }\n    return b.id - a.id\n  }\n\n  // Find out whether a line ends or starts in a collapsed span. If\n  // so, return the marker for that span.\n  function collapsedSpanAtSide(line, start) {\n    var sps = sawCollapsedSpans && line.markedSpans, found;\n    if (sps) { for (var sp = (void 0), i = 0; i < sps.length; ++i) {\n      sp = sps[i];\n      if (sp.marker.collapsed && (start ? sp.from : sp.to) == null &&\n          (!found || compareCollapsedMarkers(found, sp.marker) < 0))\n        { found = sp.marker; }\n    } }\n    return found\n  }\n  function collapsedSpanAtStart(line) { return collapsedSpanAtSide(line, true) }\n  function collapsedSpanAtEnd(line) { return collapsedSpanAtSide(line, false) }\n\n  function collapsedSpanAround(line, ch) {\n    var sps = sawCollapsedSpans && line.markedSpans, found;\n    if (sps) { for (var i = 0; i < sps.length; ++i) {\n      var sp = sps[i];\n      if (sp.marker.collapsed && (sp.from == null || sp.from < ch) && (sp.to == null || sp.to > ch) &&\n          (!found || compareCollapsedMarkers(found, sp.marker) < 0)) { found = sp.marker; }\n    } }\n    return found\n  }\n\n  // Test whether there exists a collapsed span that partially\n  // overlaps (covers the start or end, but not both) of a new span.\n  // Such overlap is not allowed.\n  function conflictingCollapsedRange(doc, lineNo, from, to, marker) {\n    var line = getLine(doc, lineNo);\n    var sps = sawCollapsedSpans && line.markedSpans;\n    if (sps) { for (var i = 0; i < sps.length; ++i) {\n      var sp = sps[i];\n      if (!sp.marker.collapsed) { continue }\n      var found = sp.marker.find(0);\n      var fromCmp = cmp(found.from, from) || extraLeft(sp.marker) - extraLeft(marker);\n      var toCmp = cmp(found.to, to) || extraRight(sp.marker) - extraRight(marker);\n      if (fromCmp >= 0 && toCmp <= 0 || fromCmp <= 0 && toCmp >= 0) { continue }\n      if (fromCmp <= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.to, from) >= 0 : cmp(found.to, from) > 0) ||\n          fromCmp >= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.from, to) <= 0 : cmp(found.from, to) < 0))\n        { return true }\n    } }\n  }\n\n  // A visual line is a line as drawn on the screen. Folding, for\n  // example, can cause multiple logical lines to appear on the same\n  // visual line. This finds the start of the visual line that the\n  // given line is part of (usually that is the line itself).\n  function visualLine(line) {\n    var merged;\n    while (merged = collapsedSpanAtStart(line))\n      { line = merged.find(-1, true).line; }\n    return line\n  }\n\n  function visualLineEnd(line) {\n    var merged;\n    while (merged = collapsedSpanAtEnd(line))\n      { line = merged.find(1, true).line; }\n    return line\n  }\n\n  // Returns an array of logical lines that continue the visual line\n  // started by the argument, or undefined if there are no such lines.\n  function visualLineContinued(line) {\n    var merged, lines;\n    while (merged = collapsedSpanAtEnd(line)) {\n      line = merged.find(1, true).line\n      ;(lines || (lines = [])).push(line);\n    }\n    return lines\n  }\n\n  // Get the line number of the start of the visual line that the\n  // given line number is part of.\n  function visualLineNo(doc, lineN) {\n    var line = getLine(doc, lineN), vis = visualLine(line);\n    if (line == vis) { return lineN }\n    return lineNo(vis)\n  }\n\n  // Get the line number of the start of the next visual line after\n  // the given line.\n  function visualLineEndNo(doc, lineN) {\n    if (lineN > doc.lastLine()) { return lineN }\n    var line = getLine(doc, lineN), merged;\n    if (!lineIsHidden(doc, line)) { return lineN }\n    while (merged = collapsedSpanAtEnd(line))\n      { line = merged.find(1, true).line; }\n    return lineNo(line) + 1\n  }\n\n  // Compute whether a line is hidden. Lines count as hidden when they\n  // are part of a visual line that starts with another line, or when\n  // they are entirely covered by collapsed, non-widget span.\n  function lineIsHidden(doc, line) {\n    var sps = sawCollapsedSpans && line.markedSpans;\n    if (sps) { for (var sp = (void 0), i = 0; i < sps.length; ++i) {\n      sp = sps[i];\n      if (!sp.marker.collapsed) { continue }\n      if (sp.from == null) { return true }\n      if (sp.marker.widgetNode) { continue }\n      if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp))\n        { return true }\n    } }\n  }\n  function lineIsHiddenInner(doc, line, span) {\n    if (span.to == null) {\n      var end = span.marker.find(1, true);\n      return lineIsHiddenInner(doc, end.line, getMarkedSpanFor(end.line.markedSpans, span.marker))\n    }\n    if (span.marker.inclusiveRight && span.to == line.text.length)\n      { return true }\n    for (var sp = (void 0), i = 0; i < line.markedSpans.length; ++i) {\n      sp = line.markedSpans[i];\n      if (sp.marker.collapsed && !sp.marker.widgetNode && sp.from == span.to &&\n          (sp.to == null || sp.to != span.from) &&\n          (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&\n          lineIsHiddenInner(doc, line, sp)) { return true }\n    }\n  }\n\n  // Find the height above the given line.\n  function heightAtLine(lineObj) {\n    lineObj = visualLine(lineObj);\n\n    var h = 0, chunk = lineObj.parent;\n    for (var i = 0; i < chunk.lines.length; ++i) {\n      var line = chunk.lines[i];\n      if (line == lineObj) { break }\n      else { h += line.height; }\n    }\n    for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {\n      for (var i$1 = 0; i$1 < p.children.length; ++i$1) {\n        var cur = p.children[i$1];\n        if (cur == chunk) { break }\n        else { h += cur.height; }\n      }\n    }\n    return h\n  }\n\n  // Compute the character length of a line, taking into account\n  // collapsed ranges (see markText) that might hide parts, and join\n  // other lines onto it.\n  function lineLength(line) {\n    if (line.height == 0) { return 0 }\n    var len = line.text.length, merged, cur = line;\n    while (merged = collapsedSpanAtStart(cur)) {\n      var found = merged.find(0, true);\n      cur = found.from.line;\n      len += found.from.ch - found.to.ch;\n    }\n    cur = line;\n    while (merged = collapsedSpanAtEnd(cur)) {\n      var found$1 = merged.find(0, true);\n      len -= cur.text.length - found$1.from.ch;\n      cur = found$1.to.line;\n      len += cur.text.length - found$1.to.ch;\n    }\n    return len\n  }\n\n  // Find the longest line in the document.\n  function findMaxLine(cm) {\n    var d = cm.display, doc = cm.doc;\n    d.maxLine = getLine(doc, doc.first);\n    d.maxLineLength = lineLength(d.maxLine);\n    d.maxLineChanged = true;\n    doc.iter(function (line) {\n      var len = lineLength(line);\n      if (len > d.maxLineLength) {\n        d.maxLineLength = len;\n        d.maxLine = line;\n      }\n    });\n  }\n\n  // LINE DATA STRUCTURE\n\n  // Line objects. These hold state related to a line, including\n  // highlighting info (the styles array).\n  var Line = function(text, markedSpans, estimateHeight) {\n    this.text = text;\n    attachMarkedSpans(this, markedSpans);\n    this.height = estimateHeight ? estimateHeight(this) : 1;\n  };\n\n  Line.prototype.lineNo = function () { return lineNo(this) };\n  eventMixin(Line);\n\n  // Change the content (text, markers) of a line. Automatically\n  // invalidates cached information and tries to re-estimate the\n  // line's height.\n  function updateLine(line, text, markedSpans, estimateHeight) {\n    line.text = text;\n    if (line.stateAfter) { line.stateAfter = null; }\n    if (line.styles) { line.styles = null; }\n    if (line.order != null) { line.order = null; }\n    detachMarkedSpans(line);\n    attachMarkedSpans(line, markedSpans);\n    var estHeight = estimateHeight ? estimateHeight(line) : 1;\n    if (estHeight != line.height) { updateLineHeight(line, estHeight); }\n  }\n\n  // Detach a line from the document tree and its markers.\n  function cleanUpLine(line) {\n    line.parent = null;\n    detachMarkedSpans(line);\n  }\n\n  // Convert a style as returned by a mode (either null, or a string\n  // containing one or more styles) to a CSS style. This is cached,\n  // and also looks for line-wide styles.\n  var styleToClassCache = {}, styleToClassCacheWithMode = {};\n  function interpretTokenStyle(style, options) {\n    if (!style || /^\\s*$/.test(style)) { return null }\n    var cache = options.addModeClass ? styleToClassCacheWithMode : styleToClassCache;\n    return cache[style] ||\n      (cache[style] = style.replace(/\\S+/g, \"cm-$&\"))\n  }\n\n  // Render the DOM representation of the text of a line. Also builds\n  // up a 'line map', which points at the DOM nodes that represent\n  // specific stretches of text, and is used by the measuring code.\n  // The returned object contains the DOM node, this map, and\n  // information about line-wide styles that were set by the mode.\n  function buildLineContent(cm, lineView) {\n    // The padding-right forces the element to have a 'border', which\n    // is needed on Webkit to be able to get line-level bounding\n    // rectangles for it (in measureChar).\n    var content = eltP(\"span\", null, null, webkit ? \"padding-right: .1px\" : null);\n    var builder = {pre: eltP(\"pre\", [content], \"CodeMirror-line\"), content: content,\n                   col: 0, pos: 0, cm: cm,\n                   trailingSpace: false,\n                   splitSpaces: cm.getOption(\"lineWrapping\")};\n    lineView.measure = {};\n\n    // Iterate over the logical lines that make up this visual line.\n    for (var i = 0; i <= (lineView.rest ? lineView.rest.length : 0); i++) {\n      var line = i ? lineView.rest[i - 1] : lineView.line, order = (void 0);\n      builder.pos = 0;\n      builder.addToken = buildToken;\n      // Optionally wire in some hacks into the token-rendering\n      // algorithm, to deal with browser quirks.\n      if (hasBadBidiRects(cm.display.measure) && (order = getOrder(line, cm.doc.direction)))\n        { builder.addToken = buildTokenBadBidi(builder.addToken, order); }\n      builder.map = [];\n      var allowFrontierUpdate = lineView != cm.display.externalMeasured && lineNo(line);\n      insertLineContent(line, builder, getLineStyles(cm, line, allowFrontierUpdate));\n      if (line.styleClasses) {\n        if (line.styleClasses.bgClass)\n          { builder.bgClass = joinClasses(line.styleClasses.bgClass, builder.bgClass || \"\"); }\n        if (line.styleClasses.textClass)\n          { builder.textClass = joinClasses(line.styleClasses.textClass, builder.textClass || \"\"); }\n      }\n\n      // Ensure at least a single node is present, for measuring.\n      if (builder.map.length == 0)\n        { builder.map.push(0, 0, builder.content.appendChild(zeroWidthElement(cm.display.measure))); }\n\n      // Store the map and a cache object for the current logical line\n      if (i == 0) {\n        lineView.measure.map = builder.map;\n        lineView.measure.cache = {};\n      } else {\n  (lineView.measure.maps || (lineView.measure.maps = [])).push(builder.map)\n        ;(lineView.measure.caches || (lineView.measure.caches = [])).push({});\n      }\n    }\n\n    // See issue #2901\n    if (webkit) {\n      var last = builder.content.lastChild;\n      if (/\\bcm-tab\\b/.test(last.className) || (last.querySelector && last.querySelector(\".cm-tab\")))\n        { builder.content.className = \"cm-tab-wrap-hack\"; }\n    }\n\n    signal(cm, \"renderLine\", cm, lineView.line, builder.pre);\n    if (builder.pre.className)\n      { builder.textClass = joinClasses(builder.pre.className, builder.textClass || \"\"); }\n\n    return builder\n  }\n\n  function defaultSpecialCharPlaceholder(ch) {\n    var token = elt(\"span\", \"\\u2022\", \"cm-invalidchar\");\n    token.title = \"\\\\u\" + ch.charCodeAt(0).toString(16);\n    token.setAttribute(\"aria-label\", token.title);\n    return token\n  }\n\n  // Build up the DOM representation for a single token, and add it to\n  // the line map. Takes care to render special characters separately.\n  function buildToken(builder, text, style, startStyle, endStyle, css, attributes) {\n    if (!text) { return }\n    var displayText = builder.splitSpaces ? splitSpaces(text, builder.trailingSpace) : text;\n    var special = builder.cm.state.specialChars, mustWrap = false;\n    var content;\n    if (!special.test(text)) {\n      builder.col += text.length;\n      content = document.createTextNode(displayText);\n      builder.map.push(builder.pos, builder.pos + text.length, content);\n      if (ie && ie_version < 9) { mustWrap = true; }\n      builder.pos += text.length;\n    } else {\n      content = document.createDocumentFragment();\n      var pos = 0;\n      while (true) {\n        special.lastIndex = pos;\n        var m = special.exec(text);\n        var skipped = m ? m.index - pos : text.length - pos;\n        if (skipped) {\n          var txt = document.createTextNode(displayText.slice(pos, pos + skipped));\n          if (ie && ie_version < 9) { content.appendChild(elt(\"span\", [txt])); }\n          else { content.appendChild(txt); }\n          builder.map.push(builder.pos, builder.pos + skipped, txt);\n          builder.col += skipped;\n          builder.pos += skipped;\n        }\n        if (!m) { break }\n        pos += skipped + 1;\n        var txt$1 = (void 0);\n        if (m[0] == \"\\t\") {\n          var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize;\n          txt$1 = content.appendChild(elt(\"span\", spaceStr(tabWidth), \"cm-tab\"));\n          txt$1.setAttribute(\"role\", \"presentation\");\n          txt$1.setAttribute(\"cm-text\", \"\\t\");\n          builder.col += tabWidth;\n        } else if (m[0] == \"\\r\" || m[0] == \"\\n\") {\n          txt$1 = content.appendChild(elt(\"span\", m[0] == \"\\r\" ? \"\\u240d\" : \"\\u2424\", \"cm-invalidchar\"));\n          txt$1.setAttribute(\"cm-text\", m[0]);\n          builder.col += 1;\n        } else {\n          txt$1 = builder.cm.options.specialCharPlaceholder(m[0]);\n          txt$1.setAttribute(\"cm-text\", m[0]);\n          if (ie && ie_version < 9) { content.appendChild(elt(\"span\", [txt$1])); }\n          else { content.appendChild(txt$1); }\n          builder.col += 1;\n        }\n        builder.map.push(builder.pos, builder.pos + 1, txt$1);\n        builder.pos++;\n      }\n    }\n    builder.trailingSpace = displayText.charCodeAt(text.length - 1) == 32;\n    if (style || startStyle || endStyle || mustWrap || css) {\n      var fullStyle = style || \"\";\n      if (startStyle) { fullStyle += startStyle; }\n      if (endStyle) { fullStyle += endStyle; }\n      var token = elt(\"span\", [content], fullStyle, css);\n      if (attributes) {\n        for (var attr in attributes) { if (attributes.hasOwnProperty(attr) && attr != \"style\" && attr != \"class\")\n          { token.setAttribute(attr, attributes[attr]); } }\n      }\n      return builder.content.appendChild(token)\n    }\n    builder.content.appendChild(content);\n  }\n\n  // Change some spaces to NBSP to prevent the browser from collapsing\n  // trailing spaces at the end of a line when rendering text (issue #1362).\n  function splitSpaces(text, trailingBefore) {\n    if (text.length > 1 && !/  /.test(text)) { return text }\n    var spaceBefore = trailingBefore, result = \"\";\n    for (var i = 0; i < text.length; i++) {\n      var ch = text.charAt(i);\n      if (ch == \" \" && spaceBefore && (i == text.length - 1 || text.charCodeAt(i + 1) == 32))\n        { ch = \"\\u00a0\"; }\n      result += ch;\n      spaceBefore = ch == \" \";\n    }\n    return result\n  }\n\n  // Work around nonsense dimensions being reported for stretches of\n  // right-to-left text.\n  function buildTokenBadBidi(inner, order) {\n    return function (builder, text, style, startStyle, endStyle, css, attributes) {\n      style = style ? style + \" cm-force-border\" : \"cm-force-border\";\n      var start = builder.pos, end = start + text.length;\n      for (;;) {\n        // Find the part that overlaps with the start of this text\n        var part = (void 0);\n        for (var i = 0; i < order.length; i++) {\n          part = order[i];\n          if (part.to > start && part.from <= start) { break }\n        }\n        if (part.to >= end) { return inner(builder, text, style, startStyle, endStyle, css, attributes) }\n        inner(builder, text.slice(0, part.to - start), style, startStyle, null, css, attributes);\n        startStyle = null;\n        text = text.slice(part.to - start);\n        start = part.to;\n      }\n    }\n  }\n\n  function buildCollapsedSpan(builder, size, marker, ignoreWidget) {\n    var widget = !ignoreWidget && marker.widgetNode;\n    if (widget) { builder.map.push(builder.pos, builder.pos + size, widget); }\n    if (!ignoreWidget && builder.cm.display.input.needsContentAttribute) {\n      if (!widget)\n        { widget = builder.content.appendChild(document.createElement(\"span\")); }\n      widget.setAttribute(\"cm-marker\", marker.id);\n    }\n    if (widget) {\n      builder.cm.display.input.setUneditable(widget);\n      builder.content.appendChild(widget);\n    }\n    builder.pos += size;\n    builder.trailingSpace = false;\n  }\n\n  // Outputs a number of spans to make up a line, taking highlighting\n  // and marked text into account.\n  function insertLineContent(line, builder, styles) {\n    var spans = line.markedSpans, allText = line.text, at = 0;\n    if (!spans) {\n      for (var i$1 = 1; i$1 < styles.length; i$1+=2)\n        { builder.addToken(builder, allText.slice(at, at = styles[i$1]), interpretTokenStyle(styles[i$1+1], builder.cm.options)); }\n      return\n    }\n\n    var len = allText.length, pos = 0, i = 1, text = \"\", style, css;\n    var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, collapsed, attributes;\n    for (;;) {\n      if (nextChange == pos) { // Update current marker set\n        spanStyle = spanEndStyle = spanStartStyle = css = \"\";\n        attributes = null;\n        collapsed = null; nextChange = Infinity;\n        var foundBookmarks = [], endStyles = (void 0);\n        for (var j = 0; j < spans.length; ++j) {\n          var sp = spans[j], m = sp.marker;\n          if (m.type == \"bookmark\" && sp.from == pos && m.widgetNode) {\n            foundBookmarks.push(m);\n          } else if (sp.from <= pos && (sp.to == null || sp.to > pos || m.collapsed && sp.to == pos && sp.from == pos)) {\n            if (sp.to != null && sp.to != pos && nextChange > sp.to) {\n              nextChange = sp.to;\n              spanEndStyle = \"\";\n            }\n            if (m.className) { spanStyle += \" \" + m.className; }\n            if (m.css) { css = (css ? css + \";\" : \"\") + m.css; }\n            if (m.startStyle && sp.from == pos) { spanStartStyle += \" \" + m.startStyle; }\n            if (m.endStyle && sp.to == nextChange) { (endStyles || (endStyles = [])).push(m.endStyle, sp.to); }\n            // support for the old title property\n            // https://github.com/codemirror/CodeMirror/pull/5673\n            if (m.title) { (attributes || (attributes = {})).title = m.title; }\n            if (m.attributes) {\n              for (var attr in m.attributes)\n                { (attributes || (attributes = {}))[attr] = m.attributes[attr]; }\n            }\n            if (m.collapsed && (!collapsed || compareCollapsedMarkers(collapsed.marker, m) < 0))\n              { collapsed = sp; }\n          } else if (sp.from > pos && nextChange > sp.from) {\n            nextChange = sp.from;\n          }\n        }\n        if (endStyles) { for (var j$1 = 0; j$1 < endStyles.length; j$1 += 2)\n          { if (endStyles[j$1 + 1] == nextChange) { spanEndStyle += \" \" + endStyles[j$1]; } } }\n\n        if (!collapsed || collapsed.from == pos) { for (var j$2 = 0; j$2 < foundBookmarks.length; ++j$2)\n          { buildCollapsedSpan(builder, 0, foundBookmarks[j$2]); } }\n        if (collapsed && (collapsed.from || 0) == pos) {\n          buildCollapsedSpan(builder, (collapsed.to == null ? len + 1 : collapsed.to) - pos,\n                             collapsed.marker, collapsed.from == null);\n          if (collapsed.to == null) { return }\n          if (collapsed.to == pos) { collapsed = false; }\n        }\n      }\n      if (pos >= len) { break }\n\n      var upto = Math.min(len, nextChange);\n      while (true) {\n        if (text) {\n          var end = pos + text.length;\n          if (!collapsed) {\n            var tokenText = end > upto ? text.slice(0, upto - pos) : text;\n            builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,\n                             spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : \"\", css, attributes);\n          }\n          if (end >= upto) {text = text.slice(upto - pos); pos = upto; break}\n          pos = end;\n          spanStartStyle = \"\";\n        }\n        text = allText.slice(at, at = styles[i++]);\n        style = interpretTokenStyle(styles[i++], builder.cm.options);\n      }\n    }\n  }\n\n\n  // These objects are used to represent the visible (currently drawn)\n  // part of the document. A LineView may correspond to multiple\n  // logical lines, if those are connected by collapsed ranges.\n  function LineView(doc, line, lineN) {\n    // The starting line\n    this.line = line;\n    // Continuing lines, if any\n    this.rest = visualLineContinued(line);\n    // Number of logical lines in this visual line\n    this.size = this.rest ? lineNo(lst(this.rest)) - lineN + 1 : 1;\n    this.node = this.text = null;\n    this.hidden = lineIsHidden(doc, line);\n  }\n\n  // Create a range of LineView objects for the given lines.\n  function buildViewArray(cm, from, to) {\n    var array = [], nextPos;\n    for (var pos = from; pos < to; pos = nextPos) {\n      var view = new LineView(cm.doc, getLine(cm.doc, pos), pos);\n      nextPos = pos + view.size;\n      array.push(view);\n    }\n    return array\n  }\n\n  var operationGroup = null;\n\n  function pushOperation(op) {\n    if (operationGroup) {\n      operationGroup.ops.push(op);\n    } else {\n      op.ownsGroup = operationGroup = {\n        ops: [op],\n        delayedCallbacks: []\n      };\n    }\n  }\n\n  function fireCallbacksForOps(group) {\n    // Calls delayed callbacks and cursorActivity handlers until no\n    // new ones appear\n    var callbacks = group.delayedCallbacks, i = 0;\n    do {\n      for (; i < callbacks.length; i++)\n        { callbacks[i].call(null); }\n      for (var j = 0; j < group.ops.length; j++) {\n        var op = group.ops[j];\n        if (op.cursorActivityHandlers)\n          { while (op.cursorActivityCalled < op.cursorActivityHandlers.length)\n            { op.cursorActivityHandlers[op.cursorActivityCalled++].call(null, op.cm); } }\n      }\n    } while (i < callbacks.length)\n  }\n\n  function finishOperation(op, endCb) {\n    var group = op.ownsGroup;\n    if (!group) { return }\n\n    try { fireCallbacksForOps(group); }\n    finally {\n      operationGroup = null;\n      endCb(group);\n    }\n  }\n\n  var orphanDelayedCallbacks = null;\n\n  // Often, we want to signal events at a point where we are in the\n  // middle of some work, but don't want the handler to start calling\n  // other methods on the editor, which might be in an inconsistent\n  // state or simply not expect any other events to happen.\n  // signalLater looks whether there are any handlers, and schedules\n  // them to be executed when the last operation ends, or, if no\n  // operation is active, when a timeout fires.\n  function signalLater(emitter, type /*, values...*/) {\n    var arr = getHandlers(emitter, type);\n    if (!arr.length) { return }\n    var args = Array.prototype.slice.call(arguments, 2), list;\n    if (operationGroup) {\n      list = operationGroup.delayedCallbacks;\n    } else if (orphanDelayedCallbacks) {\n      list = orphanDelayedCallbacks;\n    } else {\n      list = orphanDelayedCallbacks = [];\n      setTimeout(fireOrphanDelayed, 0);\n    }\n    var loop = function ( i ) {\n      list.push(function () { return arr[i].apply(null, args); });\n    };\n\n    for (var i = 0; i < arr.length; ++i)\n      loop( i );\n  }\n\n  function fireOrphanDelayed() {\n    var delayed = orphanDelayedCallbacks;\n    orphanDelayedCallbacks = null;\n    for (var i = 0; i < delayed.length; ++i) { delayed[i](); }\n  }\n\n  // When an aspect of a line changes, a string is added to\n  // lineView.changes. This updates the relevant part of the line's\n  // DOM structure.\n  function updateLineForChanges(cm, lineView, lineN, dims) {\n    for (var j = 0; j < lineView.changes.length; j++) {\n      var type = lineView.changes[j];\n      if (type == \"text\") { updateLineText(cm, lineView); }\n      else if (type == \"gutter\") { updateLineGutter(cm, lineView, lineN, dims); }\n      else if (type == \"class\") { updateLineClasses(cm, lineView); }\n      else if (type == \"widget\") { updateLineWidgets(cm, lineView, dims); }\n    }\n    lineView.changes = null;\n  }\n\n  // Lines with gutter elements, widgets or a background class need to\n  // be wrapped, and have the extra elements added to the wrapper div\n  function ensureLineWrapped(lineView) {\n    if (lineView.node == lineView.text) {\n      lineView.node = elt(\"div\", null, null, \"position: relative\");\n      if (lineView.text.parentNode)\n        { lineView.text.parentNode.replaceChild(lineView.node, lineView.text); }\n      lineView.node.appendChild(lineView.text);\n      if (ie && ie_version < 8) { lineView.node.style.zIndex = 2; }\n    }\n    return lineView.node\n  }\n\n  function updateLineBackground(cm, lineView) {\n    var cls = lineView.bgClass ? lineView.bgClass + \" \" + (lineView.line.bgClass || \"\") : lineView.line.bgClass;\n    if (cls) { cls += \" CodeMirror-linebackground\"; }\n    if (lineView.background) {\n      if (cls) { lineView.background.className = cls; }\n      else { lineView.background.parentNode.removeChild(lineView.background); lineView.background = null; }\n    } else if (cls) {\n      var wrap = ensureLineWrapped(lineView);\n      lineView.background = wrap.insertBefore(elt(\"div\", null, cls), wrap.firstChild);\n      cm.display.input.setUneditable(lineView.background);\n    }\n  }\n\n  // Wrapper around buildLineContent which will reuse the structure\n  // in display.externalMeasured when possible.\n  function getLineContent(cm, lineView) {\n    var ext = cm.display.externalMeasured;\n    if (ext && ext.line == lineView.line) {\n      cm.display.externalMeasured = null;\n      lineView.measure = ext.measure;\n      return ext.built\n    }\n    return buildLineContent(cm, lineView)\n  }\n\n  // Redraw the line's text. Interacts with the background and text\n  // classes because the mode may output tokens that influence these\n  // classes.\n  function updateLineText(cm, lineView) {\n    var cls = lineView.text.className;\n    var built = getLineContent(cm, lineView);\n    if (lineView.text == lineView.node) { lineView.node = built.pre; }\n    lineView.text.parentNode.replaceChild(built.pre, lineView.text);\n    lineView.text = built.pre;\n    if (built.bgClass != lineView.bgClass || built.textClass != lineView.textClass) {\n      lineView.bgClass = built.bgClass;\n      lineView.textClass = built.textClass;\n      updateLineClasses(cm, lineView);\n    } else if (cls) {\n      lineView.text.className = cls;\n    }\n  }\n\n  function updateLineClasses(cm, lineView) {\n    updateLineBackground(cm, lineView);\n    if (lineView.line.wrapClass)\n      { ensureLineWrapped(lineView).className = lineView.line.wrapClass; }\n    else if (lineView.node != lineView.text)\n      { lineView.node.className = \"\"; }\n    var textClass = lineView.textClass ? lineView.textClass + \" \" + (lineView.line.textClass || \"\") : lineView.line.textClass;\n    lineView.text.className = textClass || \"\";\n  }\n\n  function updateLineGutter(cm, lineView, lineN, dims) {\n    if (lineView.gutter) {\n      lineView.node.removeChild(lineView.gutter);\n      lineView.gutter = null;\n    }\n    if (lineView.gutterBackground) {\n      lineView.node.removeChild(lineView.gutterBackground);\n      lineView.gutterBackground = null;\n    }\n    if (lineView.line.gutterClass) {\n      var wrap = ensureLineWrapped(lineView);\n      lineView.gutterBackground = elt(\"div\", null, \"CodeMirror-gutter-background \" + lineView.line.gutterClass,\n                                      (\"left: \" + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + \"px; width: \" + (dims.gutterTotalWidth) + \"px\"));\n      cm.display.input.setUneditable(lineView.gutterBackground);\n      wrap.insertBefore(lineView.gutterBackground, lineView.text);\n    }\n    var markers = lineView.line.gutterMarkers;\n    if (cm.options.lineNumbers || markers) {\n      var wrap$1 = ensureLineWrapped(lineView);\n      var gutterWrap = lineView.gutter = elt(\"div\", null, \"CodeMirror-gutter-wrapper\", (\"left: \" + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + \"px\"));\n      cm.display.input.setUneditable(gutterWrap);\n      wrap$1.insertBefore(gutterWrap, lineView.text);\n      if (lineView.line.gutterClass)\n        { gutterWrap.className += \" \" + lineView.line.gutterClass; }\n      if (cm.options.lineNumbers && (!markers || !markers[\"CodeMirror-linenumbers\"]))\n        { lineView.lineNumber = gutterWrap.appendChild(\n          elt(\"div\", lineNumberFor(cm.options, lineN),\n              \"CodeMirror-linenumber CodeMirror-gutter-elt\",\n              (\"left: \" + (dims.gutterLeft[\"CodeMirror-linenumbers\"]) + \"px; width: \" + (cm.display.lineNumInnerWidth) + \"px\"))); }\n      if (markers) { for (var k = 0; k < cm.display.gutterSpecs.length; ++k) {\n        var id = cm.display.gutterSpecs[k].className, found = markers.hasOwnProperty(id) && markers[id];\n        if (found)\n          { gutterWrap.appendChild(elt(\"div\", [found], \"CodeMirror-gutter-elt\",\n                                     (\"left: \" + (dims.gutterLeft[id]) + \"px; width: \" + (dims.gutterWidth[id]) + \"px\"))); }\n      } }\n    }\n  }\n\n  function updateLineWidgets(cm, lineView, dims) {\n    if (lineView.alignable) { lineView.alignable = null; }\n    var isWidget = classTest(\"CodeMirror-linewidget\");\n    for (var node = lineView.node.firstChild, next = (void 0); node; node = next) {\n      next = node.nextSibling;\n      if (isWidget.test(node.className)) { lineView.node.removeChild(node); }\n    }\n    insertLineWidgets(cm, lineView, dims);\n  }\n\n  // Build a line's DOM representation from scratch\n  function buildLineElement(cm, lineView, lineN, dims) {\n    var built = getLineContent(cm, lineView);\n    lineView.text = lineView.node = built.pre;\n    if (built.bgClass) { lineView.bgClass = built.bgClass; }\n    if (built.textClass) { lineView.textClass = built.textClass; }\n\n    updateLineClasses(cm, lineView);\n    updateLineGutter(cm, lineView, lineN, dims);\n    insertLineWidgets(cm, lineView, dims);\n    return lineView.node\n  }\n\n  // A lineView may contain multiple logical lines (when merged by\n  // collapsed spans). The widgets for all of them need to be drawn.\n  function insertLineWidgets(cm, lineView, dims) {\n    insertLineWidgetsFor(cm, lineView.line, lineView, dims, true);\n    if (lineView.rest) { for (var i = 0; i < lineView.rest.length; i++)\n      { insertLineWidgetsFor(cm, lineView.rest[i], lineView, dims, false); } }\n  }\n\n  function insertLineWidgetsFor(cm, line, lineView, dims, allowAbove) {\n    if (!line.widgets) { return }\n    var wrap = ensureLineWrapped(lineView);\n    for (var i = 0, ws = line.widgets; i < ws.length; ++i) {\n      var widget = ws[i], node = elt(\"div\", [widget.node], \"CodeMirror-linewidget\" + (widget.className ? \" \" + widget.className : \"\"));\n      if (!widget.handleMouseEvents) { node.setAttribute(\"cm-ignore-events\", \"true\"); }\n      positionLineWidget(widget, node, lineView, dims);\n      cm.display.input.setUneditable(node);\n      if (allowAbove && widget.above)\n        { wrap.insertBefore(node, lineView.gutter || lineView.text); }\n      else\n        { wrap.appendChild(node); }\n      signalLater(widget, \"redraw\");\n    }\n  }\n\n  function positionLineWidget(widget, node, lineView, dims) {\n    if (widget.noHScroll) {\n  (lineView.alignable || (lineView.alignable = [])).push(node);\n      var width = dims.wrapperWidth;\n      node.style.left = dims.fixedPos + \"px\";\n      if (!widget.coverGutter) {\n        width -= dims.gutterTotalWidth;\n        node.style.paddingLeft = dims.gutterTotalWidth + \"px\";\n      }\n      node.style.width = width + \"px\";\n    }\n    if (widget.coverGutter) {\n      node.style.zIndex = 5;\n      node.style.position = \"relative\";\n      if (!widget.noHScroll) { node.style.marginLeft = -dims.gutterTotalWidth + \"px\"; }\n    }\n  }\n\n  function widgetHeight(widget) {\n    if (widget.height != null) { return widget.height }\n    var cm = widget.doc.cm;\n    if (!cm) { return 0 }\n    if (!contains(document.body, widget.node)) {\n      var parentStyle = \"position: relative;\";\n      if (widget.coverGutter)\n        { parentStyle += \"margin-left: -\" + cm.display.gutters.offsetWidth + \"px;\"; }\n      if (widget.noHScroll)\n        { parentStyle += \"width: \" + cm.display.wrapper.clientWidth + \"px;\"; }\n      removeChildrenAndAdd(cm.display.measure, elt(\"div\", [widget.node], null, parentStyle));\n    }\n    return widget.height = widget.node.parentNode.offsetHeight\n  }\n\n  // Return true when the given mouse event happened in a widget\n  function eventInWidget(display, e) {\n    for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {\n      if (!n || (n.nodeType == 1 && n.getAttribute(\"cm-ignore-events\") == \"true\") ||\n          (n.parentNode == display.sizer && n != display.mover))\n        { return true }\n    }\n  }\n\n  // POSITION MEASUREMENT\n\n  function paddingTop(display) {return display.lineSpace.offsetTop}\n  function paddingVert(display) {return display.mover.offsetHeight - display.lineSpace.offsetHeight}\n  function paddingH(display) {\n    if (display.cachedPaddingH) { return display.cachedPaddingH }\n    var e = removeChildrenAndAdd(display.measure, elt(\"pre\", \"x\", \"CodeMirror-line-like\"));\n    var style = window.getComputedStyle ? window.getComputedStyle(e) : e.currentStyle;\n    var data = {left: parseInt(style.paddingLeft), right: parseInt(style.paddingRight)};\n    if (!isNaN(data.left) && !isNaN(data.right)) { display.cachedPaddingH = data; }\n    return data\n  }\n\n  function scrollGap(cm) { return scrollerGap - cm.display.nativeBarWidth }\n  function displayWidth(cm) {\n    return cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth\n  }\n  function displayHeight(cm) {\n    return cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight\n  }\n\n  // Ensure the lineView.wrapping.heights array is populated. This is\n  // an array of bottom offsets for the lines that make up a drawn\n  // line. When lineWrapping is on, there might be more than one\n  // height.\n  function ensureLineHeights(cm, lineView, rect) {\n    var wrapping = cm.options.lineWrapping;\n    var curWidth = wrapping && displayWidth(cm);\n    if (!lineView.measure.heights || wrapping && lineView.measure.width != curWidth) {\n      var heights = lineView.measure.heights = [];\n      if (wrapping) {\n        lineView.measure.width = curWidth;\n        var rects = lineView.text.firstChild.getClientRects();\n        for (var i = 0; i < rects.length - 1; i++) {\n          var cur = rects[i], next = rects[i + 1];\n          if (Math.abs(cur.bottom - next.bottom) > 2)\n            { heights.push((cur.bottom + next.top) / 2 - rect.top); }\n        }\n      }\n      heights.push(rect.bottom - rect.top);\n    }\n  }\n\n  // Find a line map (mapping character offsets to text nodes) and a\n  // measurement cache for the given line number. (A line view might\n  // contain multiple lines when collapsed ranges are present.)\n  function mapFromLineView(lineView, line, lineN) {\n    if (lineView.line == line)\n      { return {map: lineView.measure.map, cache: lineView.measure.cache} }\n    for (var i = 0; i < lineView.rest.length; i++)\n      { if (lineView.rest[i] == line)\n        { return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i]} } }\n    for (var i$1 = 0; i$1 < lineView.rest.length; i$1++)\n      { if (lineNo(lineView.rest[i$1]) > lineN)\n        { return {map: lineView.measure.maps[i$1], cache: lineView.measure.caches[i$1], before: true} } }\n  }\n\n  // Render a line into the hidden node display.externalMeasured. Used\n  // when measurement is needed for a line that's not in the viewport.\n  function updateExternalMeasurement(cm, line) {\n    line = visualLine(line);\n    var lineN = lineNo(line);\n    var view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN);\n    view.lineN = lineN;\n    var built = view.built = buildLineContent(cm, view);\n    view.text = built.pre;\n    removeChildrenAndAdd(cm.display.lineMeasure, built.pre);\n    return view\n  }\n\n  // Get a {top, bottom, left, right} box (in line-local coordinates)\n  // for a given character.\n  function measureChar(cm, line, ch, bias) {\n    return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias)\n  }\n\n  // Find a line view that corresponds to the given line number.\n  function findViewForLine(cm, lineN) {\n    if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo)\n      { return cm.display.view[findViewIndex(cm, lineN)] }\n    var ext = cm.display.externalMeasured;\n    if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size)\n      { return ext }\n  }\n\n  // Measurement can be split in two steps, the set-up work that\n  // applies to the whole line, and the measurement of the actual\n  // character. Functions like coordsChar, that need to do a lot of\n  // measurements in a row, can thus ensure that the set-up work is\n  // only done once.\n  function prepareMeasureForLine(cm, line) {\n    var lineN = lineNo(line);\n    var view = findViewForLine(cm, lineN);\n    if (view && !view.text) {\n      view = null;\n    } else if (view && view.changes) {\n      updateLineForChanges(cm, view, lineN, getDimensions(cm));\n      cm.curOp.forceUpdate = true;\n    }\n    if (!view)\n      { view = updateExternalMeasurement(cm, line); }\n\n    var info = mapFromLineView(view, line, lineN);\n    return {\n      line: line, view: view, rect: null,\n      map: info.map, cache: info.cache, before: info.before,\n      hasHeights: false\n    }\n  }\n\n  // Given a prepared measurement object, measures the position of an\n  // actual character (or fetches it from the cache).\n  function measureCharPrepared(cm, prepared, ch, bias, varHeight) {\n    if (prepared.before) { ch = -1; }\n    var key = ch + (bias || \"\"), found;\n    if (prepared.cache.hasOwnProperty(key)) {\n      found = prepared.cache[key];\n    } else {\n      if (!prepared.rect)\n        { prepared.rect = prepared.view.text.getBoundingClientRect(); }\n      if (!prepared.hasHeights) {\n        ensureLineHeights(cm, prepared.view, prepared.rect);\n        prepared.hasHeights = true;\n      }\n      found = measureCharInner(cm, prepared, ch, bias);\n      if (!found.bogus) { prepared.cache[key] = found; }\n    }\n    return {left: found.left, right: found.right,\n            top: varHeight ? found.rtop : found.top,\n            bottom: varHeight ? found.rbottom : found.bottom}\n  }\n\n  var nullRect = {left: 0, right: 0, top: 0, bottom: 0};\n\n  function nodeAndOffsetInLineMap(map, ch, bias) {\n    var node, start, end, collapse, mStart, mEnd;\n    // First, search the line map for the text node corresponding to,\n    // or closest to, the target character.\n    for (var i = 0; i < map.length; i += 3) {\n      mStart = map[i];\n      mEnd = map[i + 1];\n      if (ch < mStart) {\n        start = 0; end = 1;\n        collapse = \"left\";\n      } else if (ch < mEnd) {\n        start = ch - mStart;\n        end = start + 1;\n      } else if (i == map.length - 3 || ch == mEnd && map[i + 3] > ch) {\n        end = mEnd - mStart;\n        start = end - 1;\n        if (ch >= mEnd) { collapse = \"right\"; }\n      }\n      if (start != null) {\n        node = map[i + 2];\n        if (mStart == mEnd && bias == (node.insertLeft ? \"left\" : \"right\"))\n          { collapse = bias; }\n        if (bias == \"left\" && start == 0)\n          { while (i && map[i - 2] == map[i - 3] && map[i - 1].insertLeft) {\n            node = map[(i -= 3) + 2];\n            collapse = \"left\";\n          } }\n        if (bias == \"right\" && start == mEnd - mStart)\n          { while (i < map.length - 3 && map[i + 3] == map[i + 4] && !map[i + 5].insertLeft) {\n            node = map[(i += 3) + 2];\n            collapse = \"right\";\n          } }\n        break\n      }\n    }\n    return {node: node, start: start, end: end, collapse: collapse, coverStart: mStart, coverEnd: mEnd}\n  }\n\n  function getUsefulRect(rects, bias) {\n    var rect = nullRect;\n    if (bias == \"left\") { for (var i = 0; i < rects.length; i++) {\n      if ((rect = rects[i]).left != rect.right) { break }\n    } } else { for (var i$1 = rects.length - 1; i$1 >= 0; i$1--) {\n      if ((rect = rects[i$1]).left != rect.right) { break }\n    } }\n    return rect\n  }\n\n  function measureCharInner(cm, prepared, ch, bias) {\n    var place = nodeAndOffsetInLineMap(prepared.map, ch, bias);\n    var node = place.node, start = place.start, end = place.end, collapse = place.collapse;\n\n    var rect;\n    if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.\n      for (var i$1 = 0; i$1 < 4; i$1++) { // Retry a maximum of 4 times when nonsense rectangles are returned\n        while (start && isExtendingChar(prepared.line.text.charAt(place.coverStart + start))) { --start; }\n        while (place.coverStart + end < place.coverEnd && isExtendingChar(prepared.line.text.charAt(place.coverStart + end))) { ++end; }\n        if (ie && ie_version < 9 && start == 0 && end == place.coverEnd - place.coverStart)\n          { rect = node.parentNode.getBoundingClientRect(); }\n        else\n          { rect = getUsefulRect(range(node, start, end).getClientRects(), bias); }\n        if (rect.left || rect.right || start == 0) { break }\n        end = start;\n        start = start - 1;\n        collapse = \"right\";\n      }\n      if (ie && ie_version < 11) { rect = maybeUpdateRectForZooming(cm.display.measure, rect); }\n    } else { // If it is a widget, simply get the box for the whole widget.\n      if (start > 0) { collapse = bias = \"right\"; }\n      var rects;\n      if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1)\n        { rect = rects[bias == \"right\" ? rects.length - 1 : 0]; }\n      else\n        { rect = node.getBoundingClientRect(); }\n    }\n    if (ie && ie_version < 9 && !start && (!rect || !rect.left && !rect.right)) {\n      var rSpan = node.parentNode.getClientRects()[0];\n      if (rSpan)\n        { rect = {left: rSpan.left, right: rSpan.left + charWidth(cm.display), top: rSpan.top, bottom: rSpan.bottom}; }\n      else\n        { rect = nullRect; }\n    }\n\n    var rtop = rect.top - prepared.rect.top, rbot = rect.bottom - prepared.rect.top;\n    var mid = (rtop + rbot) / 2;\n    var heights = prepared.view.measure.heights;\n    var i = 0;\n    for (; i < heights.length - 1; i++)\n      { if (mid < heights[i]) { break } }\n    var top = i ? heights[i - 1] : 0, bot = heights[i];\n    var result = {left: (collapse == \"right\" ? rect.right : rect.left) - prepared.rect.left,\n                  right: (collapse == \"left\" ? rect.left : rect.right) - prepared.rect.left,\n                  top: top, bottom: bot};\n    if (!rect.left && !rect.right) { result.bogus = true; }\n    if (!cm.options.singleCursorHeightPerLine) { result.rtop = rtop; result.rbottom = rbot; }\n\n    return result\n  }\n\n  // Work around problem with bounding client rects on ranges being\n  // returned incorrectly when zoomed on IE10 and below.\n  function maybeUpdateRectForZooming(measure, rect) {\n    if (!window.screen || screen.logicalXDPI == null ||\n        screen.logicalXDPI == screen.deviceXDPI || !hasBadZoomedRects(measure))\n      { return rect }\n    var scaleX = screen.logicalXDPI / screen.deviceXDPI;\n    var scaleY = screen.logicalYDPI / screen.deviceYDPI;\n    return {left: rect.left * scaleX, right: rect.right * scaleX,\n            top: rect.top * scaleY, bottom: rect.bottom * scaleY}\n  }\n\n  function clearLineMeasurementCacheFor(lineView) {\n    if (lineView.measure) {\n      lineView.measure.cache = {};\n      lineView.measure.heights = null;\n      if (lineView.rest) { for (var i = 0; i < lineView.rest.length; i++)\n        { lineView.measure.caches[i] = {}; } }\n    }\n  }\n\n  function clearLineMeasurementCache(cm) {\n    cm.display.externalMeasure = null;\n    removeChildren(cm.display.lineMeasure);\n    for (var i = 0; i < cm.display.view.length; i++)\n      { clearLineMeasurementCacheFor(cm.display.view[i]); }\n  }\n\n  function clearCaches(cm) {\n    clearLineMeasurementCache(cm);\n    cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = null;\n    if (!cm.options.lineWrapping) { cm.display.maxLineChanged = true; }\n    cm.display.lineNumChars = null;\n  }\n\n  function pageScrollX() {\n    // Work around https://bugs.chromium.org/p/chromium/issues/detail?id=489206\n    // which causes page_Offset and bounding client rects to use\n    // different reference viewports and invalidate our calculations.\n    if (chrome && android) { return -(document.body.getBoundingClientRect().left - parseInt(getComputedStyle(document.body).marginLeft)) }\n    return window.pageXOffset || (document.documentElement || document.body).scrollLeft\n  }\n  function pageScrollY() {\n    if (chrome && android) { return -(document.body.getBoundingClientRect().top - parseInt(getComputedStyle(document.body).marginTop)) }\n    return window.pageYOffset || (document.documentElement || document.body).scrollTop\n  }\n\n  function widgetTopHeight(lineObj) {\n    var height = 0;\n    if (lineObj.widgets) { for (var i = 0; i < lineObj.widgets.length; ++i) { if (lineObj.widgets[i].above)\n      { height += widgetHeight(lineObj.widgets[i]); } } }\n    return height\n  }\n\n  // Converts a {top, bottom, left, right} box from line-local\n  // coordinates into another coordinate system. Context may be one of\n  // \"line\", \"div\" (display.lineDiv), \"local\"./null (editor), \"window\",\n  // or \"page\".\n  function intoCoordSystem(cm, lineObj, rect, context, includeWidgets) {\n    if (!includeWidgets) {\n      var height = widgetTopHeight(lineObj);\n      rect.top += height; rect.bottom += height;\n    }\n    if (context == \"line\") { return rect }\n    if (!context) { context = \"local\"; }\n    var yOff = heightAtLine(lineObj);\n    if (context == \"local\") { yOff += paddingTop(cm.display); }\n    else { yOff -= cm.display.viewOffset; }\n    if (context == \"page\" || context == \"window\") {\n      var lOff = cm.display.lineSpace.getBoundingClientRect();\n      yOff += lOff.top + (context == \"window\" ? 0 : pageScrollY());\n      var xOff = lOff.left + (context == \"window\" ? 0 : pageScrollX());\n      rect.left += xOff; rect.right += xOff;\n    }\n    rect.top += yOff; rect.bottom += yOff;\n    return rect\n  }\n\n  // Coverts a box from \"div\" coords to another coordinate system.\n  // Context may be \"window\", \"page\", \"div\", or \"local\"./null.\n  function fromCoordSystem(cm, coords, context) {\n    if (context == \"div\") { return coords }\n    var left = coords.left, top = coords.top;\n    // First move into \"page\" coordinate system\n    if (context == \"page\") {\n      left -= pageScrollX();\n      top -= pageScrollY();\n    } else if (context == \"local\" || !context) {\n      var localBox = cm.display.sizer.getBoundingClientRect();\n      left += localBox.left;\n      top += localBox.top;\n    }\n\n    var lineSpaceBox = cm.display.lineSpace.getBoundingClientRect();\n    return {left: left - lineSpaceBox.left, top: top - lineSpaceBox.top}\n  }\n\n  function charCoords(cm, pos, context, lineObj, bias) {\n    if (!lineObj) { lineObj = getLine(cm.doc, pos.line); }\n    return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, bias), context)\n  }\n\n  // Returns a box for a given cursor position, which may have an\n  // 'other' property containing the position of the secondary cursor\n  // on a bidi boundary.\n  // A cursor Pos(line, char, \"before\") is on the same visual line as `char - 1`\n  // and after `char - 1` in writing order of `char - 1`\n  // A cursor Pos(line, char, \"after\") is on the same visual line as `char`\n  // and before `char` in writing order of `char`\n  // Examples (upper-case letters are RTL, lower-case are LTR):\n  //     Pos(0, 1, ...)\n  //     before   after\n  // ab     a|b     a|b\n  // aB     a|B     aB|\n  // Ab     |Ab     A|b\n  // AB     B|A     B|A\n  // Every position after the last character on a line is considered to stick\n  // to the last character on the line.\n  function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {\n    lineObj = lineObj || getLine(cm.doc, pos.line);\n    if (!preparedMeasure) { preparedMeasure = prepareMeasureForLine(cm, lineObj); }\n    function get(ch, right) {\n      var m = measureCharPrepared(cm, preparedMeasure, ch, right ? \"right\" : \"left\", varHeight);\n      if (right) { m.left = m.right; } else { m.right = m.left; }\n      return intoCoordSystem(cm, lineObj, m, context)\n    }\n    var order = getOrder(lineObj, cm.doc.direction), ch = pos.ch, sticky = pos.sticky;\n    if (ch >= lineObj.text.length) {\n      ch = lineObj.text.length;\n      sticky = \"before\";\n    } else if (ch <= 0) {\n      ch = 0;\n      sticky = \"after\";\n    }\n    if (!order) { return get(sticky == \"before\" ? ch - 1 : ch, sticky == \"before\") }\n\n    function getBidi(ch, partPos, invert) {\n      var part = order[partPos], right = part.level == 1;\n      return get(invert ? ch - 1 : ch, right != invert)\n    }\n    var partPos = getBidiPartAt(order, ch, sticky);\n    var other = bidiOther;\n    var val = getBidi(ch, partPos, sticky == \"before\");\n    if (other != null) { val.other = getBidi(ch, other, sticky != \"before\"); }\n    return val\n  }\n\n  // Used to cheaply estimate the coordinates for a position. Used for\n  // intermediate scroll updates.\n  function estimateCoords(cm, pos) {\n    var left = 0;\n    pos = clipPos(cm.doc, pos);\n    if (!cm.options.lineWrapping) { left = charWidth(cm.display) * pos.ch; }\n    var lineObj = getLine(cm.doc, pos.line);\n    var top = heightAtLine(lineObj) + paddingTop(cm.display);\n    return {left: left, right: left, top: top, bottom: top + lineObj.height}\n  }\n\n  // Positions returned by coordsChar contain some extra information.\n  // xRel is the relative x position of the input coordinates compared\n  // to the found position (so xRel > 0 means the coordinates are to\n  // the right of the character position, for example). When outside\n  // is true, that means the coordinates lie outside the line's\n  // vertical range.\n  function PosWithInfo(line, ch, sticky, outside, xRel) {\n    var pos = Pos(line, ch, sticky);\n    pos.xRel = xRel;\n    if (outside) { pos.outside = outside; }\n    return pos\n  }\n\n  // Compute the character position closest to the given coordinates.\n  // Input must be lineSpace-local (\"div\" coordinate system).\n  function coordsChar(cm, x, y) {\n    var doc = cm.doc;\n    y += cm.display.viewOffset;\n    if (y < 0) { return PosWithInfo(doc.first, 0, null, -1, -1) }\n    var lineN = lineAtHeight(doc, y), last = doc.first + doc.size - 1;\n    if (lineN > last)\n      { return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, null, 1, 1) }\n    if (x < 0) { x = 0; }\n\n    var lineObj = getLine(doc, lineN);\n    for (;;) {\n      var found = coordsCharInner(cm, lineObj, lineN, x, y);\n      var collapsed = collapsedSpanAround(lineObj, found.ch + (found.xRel > 0 || found.outside > 0 ? 1 : 0));\n      if (!collapsed) { return found }\n      var rangeEnd = collapsed.find(1);\n      if (rangeEnd.line == lineN) { return rangeEnd }\n      lineObj = getLine(doc, lineN = rangeEnd.line);\n    }\n  }\n\n  function wrappedLineExtent(cm, lineObj, preparedMeasure, y) {\n    y -= widgetTopHeight(lineObj);\n    var end = lineObj.text.length;\n    var begin = findFirst(function (ch) { return measureCharPrepared(cm, preparedMeasure, ch - 1).bottom <= y; }, end, 0);\n    end = findFirst(function (ch) { return measureCharPrepared(cm, preparedMeasure, ch).top > y; }, begin, end);\n    return {begin: begin, end: end}\n  }\n\n  function wrappedLineExtentChar(cm, lineObj, preparedMeasure, target) {\n    if (!preparedMeasure) { preparedMeasure = prepareMeasureForLine(cm, lineObj); }\n    var targetTop = intoCoordSystem(cm, lineObj, measureCharPrepared(cm, preparedMeasure, target), \"line\").top;\n    return wrappedLineExtent(cm, lineObj, preparedMeasure, targetTop)\n  }\n\n  // Returns true if the given side of a box is after the given\n  // coordinates, in top-to-bottom, left-to-right order.\n  function boxIsAfter(box, x, y, left) {\n    return box.bottom <= y ? false : box.top > y ? true : (left ? box.left : box.right) > x\n  }\n\n  function coordsCharInner(cm, lineObj, lineNo, x, y) {\n    // Move y into line-local coordinate space\n    y -= heightAtLine(lineObj);\n    var preparedMeasure = prepareMeasureForLine(cm, lineObj);\n    // When directly calling `measureCharPrepared`, we have to adjust\n    // for the widgets at this line.\n    var widgetHeight = widgetTopHeight(lineObj);\n    var begin = 0, end = lineObj.text.length, ltr = true;\n\n    var order = getOrder(lineObj, cm.doc.direction);\n    // If the line isn't plain left-to-right text, first figure out\n    // which bidi section the coordinates fall into.\n    if (order) {\n      var part = (cm.options.lineWrapping ? coordsBidiPartWrapped : coordsBidiPart)\n                   (cm, lineObj, lineNo, preparedMeasure, order, x, y);\n      ltr = part.level != 1;\n      // The awkward -1 offsets are needed because findFirst (called\n      // on these below) will treat its first bound as inclusive,\n      // second as exclusive, but we want to actually address the\n      // characters in the part's range\n      begin = ltr ? part.from : part.to - 1;\n      end = ltr ? part.to : part.from - 1;\n    }\n\n    // A binary search to find the first character whose bounding box\n    // starts after the coordinates. If we run across any whose box wrap\n    // the coordinates, store that.\n    var chAround = null, boxAround = null;\n    var ch = findFirst(function (ch) {\n      var box = measureCharPrepared(cm, preparedMeasure, ch);\n      box.top += widgetHeight; box.bottom += widgetHeight;\n      if (!boxIsAfter(box, x, y, false)) { return false }\n      if (box.top <= y && box.left <= x) {\n        chAround = ch;\n        boxAround = box;\n      }\n      return true\n    }, begin, end);\n\n    var baseX, sticky, outside = false;\n    // If a box around the coordinates was found, use that\n    if (boxAround) {\n      // Distinguish coordinates nearer to the left or right side of the box\n      var atLeft = x - boxAround.left < boxAround.right - x, atStart = atLeft == ltr;\n      ch = chAround + (atStart ? 0 : 1);\n      sticky = atStart ? \"after\" : \"before\";\n      baseX = atLeft ? boxAround.left : boxAround.right;\n    } else {\n      // (Adjust for extended bound, if necessary.)\n      if (!ltr && (ch == end || ch == begin)) { ch++; }\n      // To determine which side to associate with, get the box to the\n      // left of the character and compare it's vertical position to the\n      // coordinates\n      sticky = ch == 0 ? \"after\" : ch == lineObj.text.length ? \"before\" :\n        (measureCharPrepared(cm, preparedMeasure, ch - (ltr ? 1 : 0)).bottom + widgetHeight <= y) == ltr ?\n        \"after\" : \"before\";\n      // Now get accurate coordinates for this place, in order to get a\n      // base X position\n      var coords = cursorCoords(cm, Pos(lineNo, ch, sticky), \"line\", lineObj, preparedMeasure);\n      baseX = coords.left;\n      outside = y < coords.top ? -1 : y >= coords.bottom ? 1 : 0;\n    }\n\n    ch = skipExtendingChars(lineObj.text, ch, 1);\n    return PosWithInfo(lineNo, ch, sticky, outside, x - baseX)\n  }\n\n  function coordsBidiPart(cm, lineObj, lineNo, preparedMeasure, order, x, y) {\n    // Bidi parts are sorted left-to-right, and in a non-line-wrapping\n    // situation, we can take this ordering to correspond to the visual\n    // ordering. This finds the first part whose end is after the given\n    // coordinates.\n    var index = findFirst(function (i) {\n      var part = order[i], ltr = part.level != 1;\n      return boxIsAfter(cursorCoords(cm, Pos(lineNo, ltr ? part.to : part.from, ltr ? \"before\" : \"after\"),\n                                     \"line\", lineObj, preparedMeasure), x, y, true)\n    }, 0, order.length - 1);\n    var part = order[index];\n    // If this isn't the first part, the part's start is also after\n    // the coordinates, and the coordinates aren't on the same line as\n    // that start, move one part back.\n    if (index > 0) {\n      var ltr = part.level != 1;\n      var start = cursorCoords(cm, Pos(lineNo, ltr ? part.from : part.to, ltr ? \"after\" : \"before\"),\n                               \"line\", lineObj, preparedMeasure);\n      if (boxIsAfter(start, x, y, true) && start.top > y)\n        { part = order[index - 1]; }\n    }\n    return part\n  }\n\n  function coordsBidiPartWrapped(cm, lineObj, _lineNo, preparedMeasure, order, x, y) {\n    // In a wrapped line, rtl text on wrapping boundaries can do things\n    // that don't correspond to the ordering in our `order` array at\n    // all, so a binary search doesn't work, and we want to return a\n    // part that only spans one line so that the binary search in\n    // coordsCharInner is safe. As such, we first find the extent of the\n    // wrapped line, and then do a flat search in which we discard any\n    // spans that aren't on the line.\n    var ref = wrappedLineExtent(cm, lineObj, preparedMeasure, y);\n    var begin = ref.begin;\n    var end = ref.end;\n    if (/\\s/.test(lineObj.text.charAt(end - 1))) { end--; }\n    var part = null, closestDist = null;\n    for (var i = 0; i < order.length; i++) {\n      var p = order[i];\n      if (p.from >= end || p.to <= begin) { continue }\n      var ltr = p.level != 1;\n      var endX = measureCharPrepared(cm, preparedMeasure, ltr ? Math.min(end, p.to) - 1 : Math.max(begin, p.from)).right;\n      // Weigh against spans ending before this, so that they are only\n      // picked if nothing ends after\n      var dist = endX < x ? x - endX + 1e9 : endX - x;\n      if (!part || closestDist > dist) {\n        part = p;\n        closestDist = dist;\n      }\n    }\n    if (!part) { part = order[order.length - 1]; }\n    // Clip the part to the wrapped line.\n    if (part.from < begin) { part = {from: begin, to: part.to, level: part.level}; }\n    if (part.to > end) { part = {from: part.from, to: end, level: part.level}; }\n    return part\n  }\n\n  var measureText;\n  // Compute the default text height.\n  function textHeight(display) {\n    if (display.cachedTextHeight != null) { return display.cachedTextHeight }\n    if (measureText == null) {\n      measureText = elt(\"pre\", null, \"CodeMirror-line-like\");\n      // Measure a bunch of lines, for browsers that compute\n      // fractional heights.\n      for (var i = 0; i < 49; ++i) {\n        measureText.appendChild(document.createTextNode(\"x\"));\n        measureText.appendChild(elt(\"br\"));\n      }\n      measureText.appendChild(document.createTextNode(\"x\"));\n    }\n    removeChildrenAndAdd(display.measure, measureText);\n    var height = measureText.offsetHeight / 50;\n    if (height > 3) { display.cachedTextHeight = height; }\n    removeChildren(display.measure);\n    return height || 1\n  }\n\n  // Compute the default character width.\n  function charWidth(display) {\n    if (display.cachedCharWidth != null) { return display.cachedCharWidth }\n    var anchor = elt(\"span\", \"xxxxxxxxxx\");\n    var pre = elt(\"pre\", [anchor], \"CodeMirror-line-like\");\n    removeChildrenAndAdd(display.measure, pre);\n    var rect = anchor.getBoundingClientRect(), width = (rect.right - rect.left) / 10;\n    if (width > 2) { display.cachedCharWidth = width; }\n    return width || 10\n  }\n\n  // Do a bulk-read of the DOM positions and sizes needed to draw the\n  // view, so that we don't interleave reading and writing to the DOM.\n  function getDimensions(cm) {\n    var d = cm.display, left = {}, width = {};\n    var gutterLeft = d.gutters.clientLeft;\n    for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {\n      var id = cm.display.gutterSpecs[i].className;\n      left[id] = n.offsetLeft + n.clientLeft + gutterLeft;\n      width[id] = n.clientWidth;\n    }\n    return {fixedPos: compensateForHScroll(d),\n            gutterTotalWidth: d.gutters.offsetWidth,\n            gutterLeft: left,\n            gutterWidth: width,\n            wrapperWidth: d.wrapper.clientWidth}\n  }\n\n  // Computes display.scroller.scrollLeft + display.gutters.offsetWidth,\n  // but using getBoundingClientRect to get a sub-pixel-accurate\n  // result.\n  function compensateForHScroll(display) {\n    return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left\n  }\n\n  // Returns a function that estimates the height of a line, to use as\n  // first approximation until the line becomes visible (and is thus\n  // properly measurable).\n  function estimateHeight(cm) {\n    var th = textHeight(cm.display), wrapping = cm.options.lineWrapping;\n    var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3);\n    return function (line) {\n      if (lineIsHidden(cm.doc, line)) { return 0 }\n\n      var widgetsHeight = 0;\n      if (line.widgets) { for (var i = 0; i < line.widgets.length; i++) {\n        if (line.widgets[i].height) { widgetsHeight += line.widgets[i].height; }\n      } }\n\n      if (wrapping)\n        { return widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th }\n      else\n        { return widgetsHeight + th }\n    }\n  }\n\n  function estimateLineHeights(cm) {\n    var doc = cm.doc, est = estimateHeight(cm);\n    doc.iter(function (line) {\n      var estHeight = est(line);\n      if (estHeight != line.height) { updateLineHeight(line, estHeight); }\n    });\n  }\n\n  // Given a mouse event, find the corresponding position. If liberal\n  // is false, it checks whether a gutter or scrollbar was clicked,\n  // and returns null if it was. forRect is used by rectangular\n  // selections, and tries to estimate a character position even for\n  // coordinates beyond the right of the text.\n  function posFromMouse(cm, e, liberal, forRect) {\n    var display = cm.display;\n    if (!liberal && e_target(e).getAttribute(\"cm-not-content\") == \"true\") { return null }\n\n    var x, y, space = display.lineSpace.getBoundingClientRect();\n    // Fails unpredictably on IE[67] when mouse is dragged around quickly.\n    try { x = e.clientX - space.left; y = e.clientY - space.top; }\n    catch (e) { return null }\n    var coords = coordsChar(cm, x, y), line;\n    if (forRect && coords.xRel > 0 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {\n      var colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length;\n      coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff));\n    }\n    return coords\n  }\n\n  // Find the view element corresponding to a given line. Return null\n  // when the line isn't visible.\n  function findViewIndex(cm, n) {\n    if (n >= cm.display.viewTo) { return null }\n    n -= cm.display.viewFrom;\n    if (n < 0) { return null }\n    var view = cm.display.view;\n    for (var i = 0; i < view.length; i++) {\n      n -= view[i].size;\n      if (n < 0) { return i }\n    }\n  }\n\n  // Updates the display.view data structure for a given change to the\n  // document. From and to are in pre-change coordinates. Lendiff is\n  // the amount of lines added or subtracted by the change. This is\n  // used for changes that span multiple lines, or change the way\n  // lines are divided into visual lines. regLineChange (below)\n  // registers single-line changes.\n  function regChange(cm, from, to, lendiff) {\n    if (from == null) { from = cm.doc.first; }\n    if (to == null) { to = cm.doc.first + cm.doc.size; }\n    if (!lendiff) { lendiff = 0; }\n\n    var display = cm.display;\n    if (lendiff && to < display.viewTo &&\n        (display.updateLineNumbers == null || display.updateLineNumbers > from))\n      { display.updateLineNumbers = from; }\n\n    cm.curOp.viewChanged = true;\n\n    if (from >= display.viewTo) { // Change after\n      if (sawCollapsedSpans && visualLineNo(cm.doc, from) < display.viewTo)\n        { resetView(cm); }\n    } else if (to <= display.viewFrom) { // Change before\n      if (sawCollapsedSpans && visualLineEndNo(cm.doc, to + lendiff) > display.viewFrom) {\n        resetView(cm);\n      } else {\n        display.viewFrom += lendiff;\n        display.viewTo += lendiff;\n      }\n    } else if (from <= display.viewFrom && to >= display.viewTo) { // Full overlap\n      resetView(cm);\n    } else if (from <= display.viewFrom) { // Top overlap\n      var cut = viewCuttingPoint(cm, to, to + lendiff, 1);\n      if (cut) {\n        display.view = display.view.slice(cut.index);\n        display.viewFrom = cut.lineN;\n        display.viewTo += lendiff;\n      } else {\n        resetView(cm);\n      }\n    } else if (to >= display.viewTo) { // Bottom overlap\n      var cut$1 = viewCuttingPoint(cm, from, from, -1);\n      if (cut$1) {\n        display.view = display.view.slice(0, cut$1.index);\n        display.viewTo = cut$1.lineN;\n      } else {\n        resetView(cm);\n      }\n    } else { // Gap in the middle\n      var cutTop = viewCuttingPoint(cm, from, from, -1);\n      var cutBot = viewCuttingPoint(cm, to, to + lendiff, 1);\n      if (cutTop && cutBot) {\n        display.view = display.view.slice(0, cutTop.index)\n          .concat(buildViewArray(cm, cutTop.lineN, cutBot.lineN))\n          .concat(display.view.slice(cutBot.index));\n        display.viewTo += lendiff;\n      } else {\n        resetView(cm);\n      }\n    }\n\n    var ext = display.externalMeasured;\n    if (ext) {\n      if (to < ext.lineN)\n        { ext.lineN += lendiff; }\n      else if (from < ext.lineN + ext.size)\n        { display.externalMeasured = null; }\n    }\n  }\n\n  // Register a change to a single line. Type must be one of \"text\",\n  // \"gutter\", \"class\", \"widget\"\n  function regLineChange(cm, line, type) {\n    cm.curOp.viewChanged = true;\n    var display = cm.display, ext = cm.display.externalMeasured;\n    if (ext && line >= ext.lineN && line < ext.lineN + ext.size)\n      { display.externalMeasured = null; }\n\n    if (line < display.viewFrom || line >= display.viewTo) { return }\n    var lineView = display.view[findViewIndex(cm, line)];\n    if (lineView.node == null) { return }\n    var arr = lineView.changes || (lineView.changes = []);\n    if (indexOf(arr, type) == -1) { arr.push(type); }\n  }\n\n  // Clear the view.\n  function resetView(cm) {\n    cm.display.viewFrom = cm.display.viewTo = cm.doc.first;\n    cm.display.view = [];\n    cm.display.viewOffset = 0;\n  }\n\n  function viewCuttingPoint(cm, oldN, newN, dir) {\n    var index = findViewIndex(cm, oldN), diff, view = cm.display.view;\n    if (!sawCollapsedSpans || newN == cm.doc.first + cm.doc.size)\n      { return {index: index, lineN: newN} }\n    var n = cm.display.viewFrom;\n    for (var i = 0; i < index; i++)\n      { n += view[i].size; }\n    if (n != oldN) {\n      if (dir > 0) {\n        if (index == view.length - 1) { return null }\n        diff = (n + view[index].size) - oldN;\n        index++;\n      } else {\n        diff = n - oldN;\n      }\n      oldN += diff; newN += diff;\n    }\n    while (visualLineNo(cm.doc, newN) != newN) {\n      if (index == (dir < 0 ? 0 : view.length - 1)) { return null }\n      newN += dir * view[index - (dir < 0 ? 1 : 0)].size;\n      index += dir;\n    }\n    return {index: index, lineN: newN}\n  }\n\n  // Force the view to cover a given range, adding empty view element\n  // or clipping off existing ones as needed.\n  function adjustView(cm, from, to) {\n    var display = cm.display, view = display.view;\n    if (view.length == 0 || from >= display.viewTo || to <= display.viewFrom) {\n      display.view = buildViewArray(cm, from, to);\n      display.viewFrom = from;\n    } else {\n      if (display.viewFrom > from)\n        { display.view = buildViewArray(cm, from, display.viewFrom).concat(display.view); }\n      else if (display.viewFrom < from)\n        { display.view = display.view.slice(findViewIndex(cm, from)); }\n      display.viewFrom = from;\n      if (display.viewTo < to)\n        { display.view = display.view.concat(buildViewArray(cm, display.viewTo, to)); }\n      else if (display.viewTo > to)\n        { display.view = display.view.slice(0, findViewIndex(cm, to)); }\n    }\n    display.viewTo = to;\n  }\n\n  // Count the number of lines in the view whose DOM representation is\n  // out of date (or nonexistent).\n  function countDirtyView(cm) {\n    var view = cm.display.view, dirty = 0;\n    for (var i = 0; i < view.length; i++) {\n      var lineView = view[i];\n      if (!lineView.hidden && (!lineView.node || lineView.changes)) { ++dirty; }\n    }\n    return dirty\n  }\n\n  function updateSelection(cm) {\n    cm.display.input.showSelection(cm.display.input.prepareSelection());\n  }\n\n  function prepareSelection(cm, primary) {\n    if ( primary === void 0 ) primary = true;\n\n    var doc = cm.doc, result = {};\n    var curFragment = result.cursors = document.createDocumentFragment();\n    var selFragment = result.selection = document.createDocumentFragment();\n\n    for (var i = 0; i < doc.sel.ranges.length; i++) {\n      if (!primary && i == doc.sel.primIndex) { continue }\n      var range = doc.sel.ranges[i];\n      if (range.from().line >= cm.display.viewTo || range.to().line < cm.display.viewFrom) { continue }\n      var collapsed = range.empty();\n      if (collapsed || cm.options.showCursorWhenSelecting)\n        { drawSelectionCursor(cm, range.head, curFragment); }\n      if (!collapsed)\n        { drawSelectionRange(cm, range, selFragment); }\n    }\n    return result\n  }\n\n  // Draws a cursor for the given range\n  function drawSelectionCursor(cm, head, output) {\n    var pos = cursorCoords(cm, head, \"div\", null, null, !cm.options.singleCursorHeightPerLine);\n\n    var cursor = output.appendChild(elt(\"div\", \"\\u00a0\", \"CodeMirror-cursor\"));\n    cursor.style.left = pos.left + \"px\";\n    cursor.style.top = pos.top + \"px\";\n    cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + \"px\";\n\n    if (pos.other) {\n      // Secondary cursor, shown when on a 'jump' in bi-directional text\n      var otherCursor = output.appendChild(elt(\"div\", \"\\u00a0\", \"CodeMirror-cursor CodeMirror-secondarycursor\"));\n      otherCursor.style.display = \"\";\n      otherCursor.style.left = pos.other.left + \"px\";\n      otherCursor.style.top = pos.other.top + \"px\";\n      otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + \"px\";\n    }\n  }\n\n  function cmpCoords(a, b) { return a.top - b.top || a.left - b.left }\n\n  // Draws the given range as a highlighted selection\n  function drawSelectionRange(cm, range, output) {\n    var display = cm.display, doc = cm.doc;\n    var fragment = document.createDocumentFragment();\n    var padding = paddingH(cm.display), leftSide = padding.left;\n    var rightSide = Math.max(display.sizerWidth, displayWidth(cm) - display.sizer.offsetLeft) - padding.right;\n    var docLTR = doc.direction == \"ltr\";\n\n    function add(left, top, width, bottom) {\n      if (top < 0) { top = 0; }\n      top = Math.round(top);\n      bottom = Math.round(bottom);\n      fragment.appendChild(elt(\"div\", null, \"CodeMirror-selected\", (\"position: absolute; left: \" + left + \"px;\\n                             top: \" + top + \"px; width: \" + (width == null ? rightSide - left : width) + \"px;\\n                             height: \" + (bottom - top) + \"px\")));\n    }\n\n    function drawForLine(line, fromArg, toArg) {\n      var lineObj = getLine(doc, line);\n      var lineLen = lineObj.text.length;\n      var start, end;\n      function coords(ch, bias) {\n        return charCoords(cm, Pos(line, ch), \"div\", lineObj, bias)\n      }\n\n      function wrapX(pos, dir, side) {\n        var extent = wrappedLineExtentChar(cm, lineObj, null, pos);\n        var prop = (dir == \"ltr\") == (side == \"after\") ? \"left\" : \"right\";\n        var ch = side == \"after\" ? extent.begin : extent.end - (/\\s/.test(lineObj.text.charAt(extent.end - 1)) ? 2 : 1);\n        return coords(ch, prop)[prop]\n      }\n\n      var order = getOrder(lineObj, doc.direction);\n      iterateBidiSections(order, fromArg || 0, toArg == null ? lineLen : toArg, function (from, to, dir, i) {\n        var ltr = dir == \"ltr\";\n        var fromPos = coords(from, ltr ? \"left\" : \"right\");\n        var toPos = coords(to - 1, ltr ? \"right\" : \"left\");\n\n        var openStart = fromArg == null && from == 0, openEnd = toArg == null && to == lineLen;\n        var first = i == 0, last = !order || i == order.length - 1;\n        if (toPos.top - fromPos.top <= 3) { // Single line\n          var openLeft = (docLTR ? openStart : openEnd) && first;\n          var openRight = (docLTR ? openEnd : openStart) && last;\n          var left = openLeft ? leftSide : (ltr ? fromPos : toPos).left;\n          var right = openRight ? rightSide : (ltr ? toPos : fromPos).right;\n          add(left, fromPos.top, right - left, fromPos.bottom);\n        } else { // Multiple lines\n          var topLeft, topRight, botLeft, botRight;\n          if (ltr) {\n            topLeft = docLTR && openStart && first ? leftSide : fromPos.left;\n            topRight = docLTR ? rightSide : wrapX(from, dir, \"before\");\n            botLeft = docLTR ? leftSide : wrapX(to, dir, \"after\");\n            botRight = docLTR && openEnd && last ? rightSide : toPos.right;\n          } else {\n            topLeft = !docLTR ? leftSide : wrapX(from, dir, \"before\");\n            topRight = !docLTR && openStart && first ? rightSide : fromPos.right;\n            botLeft = !docLTR && openEnd && last ? leftSide : toPos.left;\n            botRight = !docLTR ? rightSide : wrapX(to, dir, \"after\");\n          }\n          add(topLeft, fromPos.top, topRight - topLeft, fromPos.bottom);\n          if (fromPos.bottom < toPos.top) { add(leftSide, fromPos.bottom, null, toPos.top); }\n          add(botLeft, toPos.top, botRight - botLeft, toPos.bottom);\n        }\n\n        if (!start || cmpCoords(fromPos, start) < 0) { start = fromPos; }\n        if (cmpCoords(toPos, start) < 0) { start = toPos; }\n        if (!end || cmpCoords(fromPos, end) < 0) { end = fromPos; }\n        if (cmpCoords(toPos, end) < 0) { end = toPos; }\n      });\n      return {start: start, end: end}\n    }\n\n    var sFrom = range.from(), sTo = range.to();\n    if (sFrom.line == sTo.line) {\n      drawForLine(sFrom.line, sFrom.ch, sTo.ch);\n    } else {\n      var fromLine = getLine(doc, sFrom.line), toLine = getLine(doc, sTo.line);\n      var singleVLine = visualLine(fromLine) == visualLine(toLine);\n      var leftEnd = drawForLine(sFrom.line, sFrom.ch, singleVLine ? fromLine.text.length + 1 : null).end;\n      var rightStart = drawForLine(sTo.line, singleVLine ? 0 : null, sTo.ch).start;\n      if (singleVLine) {\n        if (leftEnd.top < rightStart.top - 2) {\n          add(leftEnd.right, leftEnd.top, null, leftEnd.bottom);\n          add(leftSide, rightStart.top, rightStart.left, rightStart.bottom);\n        } else {\n          add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom);\n        }\n      }\n      if (leftEnd.bottom < rightStart.top)\n        { add(leftSide, leftEnd.bottom, null, rightStart.top); }\n    }\n\n    output.appendChild(fragment);\n  }\n\n  // Cursor-blinking\n  function restartBlink(cm) {\n    if (!cm.state.focused) { return }\n    var display = cm.display;\n    clearInterval(display.blinker);\n    var on = true;\n    display.cursorDiv.style.visibility = \"\";\n    if (cm.options.cursorBlinkRate > 0)\n      { display.blinker = setInterval(function () { return display.cursorDiv.style.visibility = (on = !on) ? \"\" : \"hidden\"; },\n        cm.options.cursorBlinkRate); }\n    else if (cm.options.cursorBlinkRate < 0)\n      { display.cursorDiv.style.visibility = \"hidden\"; }\n  }\n\n  function ensureFocus(cm) {\n    if (!cm.state.focused) { cm.display.input.focus(); onFocus(cm); }\n  }\n\n  function delayBlurEvent(cm) {\n    cm.state.delayingBlurEvent = true;\n    setTimeout(function () { if (cm.state.delayingBlurEvent) {\n      cm.state.delayingBlurEvent = false;\n      onBlur(cm);\n    } }, 100);\n  }\n\n  function onFocus(cm, e) {\n    if (cm.state.delayingBlurEvent) { cm.state.delayingBlurEvent = false; }\n\n    if (cm.options.readOnly == \"nocursor\") { return }\n    if (!cm.state.focused) {\n      signal(cm, \"focus\", cm, e);\n      cm.state.focused = true;\n      addClass(cm.display.wrapper, \"CodeMirror-focused\");\n      // This test prevents this from firing when a context\n      // menu is closed (since the input reset would kill the\n      // select-all detection hack)\n      if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {\n        cm.display.input.reset();\n        if (webkit) { setTimeout(function () { return cm.display.input.reset(true); }, 20); } // Issue #1730\n      }\n      cm.display.input.receivedFocus();\n    }\n    restartBlink(cm);\n  }\n  function onBlur(cm, e) {\n    if (cm.state.delayingBlurEvent) { return }\n\n    if (cm.state.focused) {\n      signal(cm, \"blur\", cm, e);\n      cm.state.focused = false;\n      rmClass(cm.display.wrapper, \"CodeMirror-focused\");\n    }\n    clearInterval(cm.display.blinker);\n    setTimeout(function () { if (!cm.state.focused) { cm.display.shift = false; } }, 150);\n  }\n\n  // Read the actual heights of the rendered lines, and update their\n  // stored heights to match.\n  function updateHeightsInViewport(cm) {\n    var display = cm.display;\n    var prevBottom = display.lineDiv.offsetTop;\n    for (var i = 0; i < display.view.length; i++) {\n      var cur = display.view[i], wrapping = cm.options.lineWrapping;\n      var height = (void 0), width = 0;\n      if (cur.hidden) { continue }\n      if (ie && ie_version < 8) {\n        var bot = cur.node.offsetTop + cur.node.offsetHeight;\n        height = bot - prevBottom;\n        prevBottom = bot;\n      } else {\n        var box = cur.node.getBoundingClientRect();\n        height = box.bottom - box.top;\n        // Check that lines don't extend past the right of the current\n        // editor width\n        if (!wrapping && cur.text.firstChild)\n          { width = cur.text.firstChild.getBoundingClientRect().right - box.left - 1; }\n      }\n      var diff = cur.line.height - height;\n      if (diff > .005 || diff < -.005) {\n        updateLineHeight(cur.line, height);\n        updateWidgetHeight(cur.line);\n        if (cur.rest) { for (var j = 0; j < cur.rest.length; j++)\n          { updateWidgetHeight(cur.rest[j]); } }\n      }\n      if (width > cm.display.sizerWidth) {\n        var chWidth = Math.ceil(width / charWidth(cm.display));\n        if (chWidth > cm.display.maxLineLength) {\n          cm.display.maxLineLength = chWidth;\n          cm.display.maxLine = cur.line;\n          cm.display.maxLineChanged = true;\n        }\n      }\n    }\n  }\n\n  // Read and store the height of line widgets associated with the\n  // given line.\n  function updateWidgetHeight(line) {\n    if (line.widgets) { for (var i = 0; i < line.widgets.length; ++i) {\n      var w = line.widgets[i], parent = w.node.parentNode;\n      if (parent) { w.height = parent.offsetHeight; }\n    } }\n  }\n\n  // Compute the lines that are visible in a given viewport (defaults\n  // the the current scroll position). viewport may contain top,\n  // height, and ensure (see op.scrollToPos) properties.\n  function visibleLines(display, doc, viewport) {\n    var top = viewport && viewport.top != null ? Math.max(0, viewport.top) : display.scroller.scrollTop;\n    top = Math.floor(top - paddingTop(display));\n    var bottom = viewport && viewport.bottom != null ? viewport.bottom : top + display.wrapper.clientHeight;\n\n    var from = lineAtHeight(doc, top), to = lineAtHeight(doc, bottom);\n    // Ensure is a {from: {line, ch}, to: {line, ch}} object, and\n    // forces those lines into the viewport (if possible).\n    if (viewport && viewport.ensure) {\n      var ensureFrom = viewport.ensure.from.line, ensureTo = viewport.ensure.to.line;\n      if (ensureFrom < from) {\n        from = ensureFrom;\n        to = lineAtHeight(doc, heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight);\n      } else if (Math.min(ensureTo, doc.lastLine()) >= to) {\n        from = lineAtHeight(doc, heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight);\n        to = ensureTo;\n      }\n    }\n    return {from: from, to: Math.max(to, from + 1)}\n  }\n\n  // SCROLLING THINGS INTO VIEW\n\n  // If an editor sits on the top or bottom of the window, partially\n  // scrolled out of view, this ensures that the cursor is visible.\n  function maybeScrollWindow(cm, rect) {\n    if (signalDOMEvent(cm, \"scrollCursorIntoView\")) { return }\n\n    var display = cm.display, box = display.sizer.getBoundingClientRect(), doScroll = null;\n    if (rect.top + box.top < 0) { doScroll = true; }\n    else if (rect.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) { doScroll = false; }\n    if (doScroll != null && !phantom) {\n      var scrollNode = elt(\"div\", \"\\u200b\", null, (\"position: absolute;\\n                         top: \" + (rect.top - display.viewOffset - paddingTop(cm.display)) + \"px;\\n                         height: \" + (rect.bottom - rect.top + scrollGap(cm) + display.barHeight) + \"px;\\n                         left: \" + (rect.left) + \"px; width: \" + (Math.max(2, rect.right - rect.left)) + \"px;\"));\n      cm.display.lineSpace.appendChild(scrollNode);\n      scrollNode.scrollIntoView(doScroll);\n      cm.display.lineSpace.removeChild(scrollNode);\n    }\n  }\n\n  // Scroll a given position into view (immediately), verifying that\n  // it actually became visible (as line heights are accurately\n  // measured, the position of something may 'drift' during drawing).\n  function scrollPosIntoView(cm, pos, end, margin) {\n    if (margin == null) { margin = 0; }\n    var rect;\n    if (!cm.options.lineWrapping && pos == end) {\n      // Set pos and end to the cursor positions around the character pos sticks to\n      // If pos.sticky == \"before\", that is around pos.ch - 1, otherwise around pos.ch\n      // If pos == Pos(_, 0, \"before\"), pos and end are unchanged\n      pos = pos.ch ? Pos(pos.line, pos.sticky == \"before\" ? pos.ch - 1 : pos.ch, \"after\") : pos;\n      end = pos.sticky == \"before\" ? Pos(pos.line, pos.ch + 1, \"before\") : pos;\n    }\n    for (var limit = 0; limit < 5; limit++) {\n      var changed = false;\n      var coords = cursorCoords(cm, pos);\n      var endCoords = !end || end == pos ? coords : cursorCoords(cm, end);\n      rect = {left: Math.min(coords.left, endCoords.left),\n              top: Math.min(coords.top, endCoords.top) - margin,\n              right: Math.max(coords.left, endCoords.left),\n              bottom: Math.max(coords.bottom, endCoords.bottom) + margin};\n      var scrollPos = calculateScrollPos(cm, rect);\n      var startTop = cm.doc.scrollTop, startLeft = cm.doc.scrollLeft;\n      if (scrollPos.scrollTop != null) {\n        updateScrollTop(cm, scrollPos.scrollTop);\n        if (Math.abs(cm.doc.scrollTop - startTop) > 1) { changed = true; }\n      }\n      if (scrollPos.scrollLeft != null) {\n        setScrollLeft(cm, scrollPos.scrollLeft);\n        if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) { changed = true; }\n      }\n      if (!changed) { break }\n    }\n    return rect\n  }\n\n  // Scroll a given set of coordinates into view (immediately).\n  function scrollIntoView(cm, rect) {\n    var scrollPos = calculateScrollPos(cm, rect);\n    if (scrollPos.scrollTop != null) { updateScrollTop(cm, scrollPos.scrollTop); }\n    if (scrollPos.scrollLeft != null) { setScrollLeft(cm, scrollPos.scrollLeft); }\n  }\n\n  // Calculate a new scroll position needed to scroll the given\n  // rectangle into view. Returns an object with scrollTop and\n  // scrollLeft properties. When these are undefined, the\n  // vertical/horizontal position does not need to be adjusted.\n  function calculateScrollPos(cm, rect) {\n    var display = cm.display, snapMargin = textHeight(cm.display);\n    if (rect.top < 0) { rect.top = 0; }\n    var screentop = cm.curOp && cm.curOp.scrollTop != null ? cm.curOp.scrollTop : display.scroller.scrollTop;\n    var screen = displayHeight(cm), result = {};\n    if (rect.bottom - rect.top > screen) { rect.bottom = rect.top + screen; }\n    var docBottom = cm.doc.height + paddingVert(display);\n    var atTop = rect.top < snapMargin, atBottom = rect.bottom > docBottom - snapMargin;\n    if (rect.top < screentop) {\n      result.scrollTop = atTop ? 0 : rect.top;\n    } else if (rect.bottom > screentop + screen) {\n      var newTop = Math.min(rect.top, (atBottom ? docBottom : rect.bottom) - screen);\n      if (newTop != screentop) { result.scrollTop = newTop; }\n    }\n\n    var screenleft = cm.curOp && cm.curOp.scrollLeft != null ? cm.curOp.scrollLeft : display.scroller.scrollLeft;\n    var screenw = displayWidth(cm) - (cm.options.fixedGutter ? display.gutters.offsetWidth : 0);\n    var tooWide = rect.right - rect.left > screenw;\n    if (tooWide) { rect.right = rect.left + screenw; }\n    if (rect.left < 10)\n      { result.scrollLeft = 0; }\n    else if (rect.left < screenleft)\n      { result.scrollLeft = Math.max(0, rect.left - (tooWide ? 0 : 10)); }\n    else if (rect.right > screenw + screenleft - 3)\n      { result.scrollLeft = rect.right + (tooWide ? 0 : 10) - screenw; }\n    return result\n  }\n\n  // Store a relative adjustment to the scroll position in the current\n  // operation (to be applied when the operation finishes).\n  function addToScrollTop(cm, top) {\n    if (top == null) { return }\n    resolveScrollToPos(cm);\n    cm.curOp.scrollTop = (cm.curOp.scrollTop == null ? cm.doc.scrollTop : cm.curOp.scrollTop) + top;\n  }\n\n  // Make sure that at the end of the operation the current cursor is\n  // shown.\n  function ensureCursorVisible(cm) {\n    resolveScrollToPos(cm);\n    var cur = cm.getCursor();\n    cm.curOp.scrollToPos = {from: cur, to: cur, margin: cm.options.cursorScrollMargin};\n  }\n\n  function scrollToCoords(cm, x, y) {\n    if (x != null || y != null) { resolveScrollToPos(cm); }\n    if (x != null) { cm.curOp.scrollLeft = x; }\n    if (y != null) { cm.curOp.scrollTop = y; }\n  }\n\n  function scrollToRange(cm, range) {\n    resolveScrollToPos(cm);\n    cm.curOp.scrollToPos = range;\n  }\n\n  // When an operation has its scrollToPos property set, and another\n  // scroll action is applied before the end of the operation, this\n  // 'simulates' scrolling that position into view in a cheap way, so\n  // that the effect of intermediate scroll commands is not ignored.\n  function resolveScrollToPos(cm) {\n    var range = cm.curOp.scrollToPos;\n    if (range) {\n      cm.curOp.scrollToPos = null;\n      var from = estimateCoords(cm, range.from), to = estimateCoords(cm, range.to);\n      scrollToCoordsRange(cm, from, to, range.margin);\n    }\n  }\n\n  function scrollToCoordsRange(cm, from, to, margin) {\n    var sPos = calculateScrollPos(cm, {\n      left: Math.min(from.left, to.left),\n      top: Math.min(from.top, to.top) - margin,\n      right: Math.max(from.right, to.right),\n      bottom: Math.max(from.bottom, to.bottom) + margin\n    });\n    scrollToCoords(cm, sPos.scrollLeft, sPos.scrollTop);\n  }\n\n  // Sync the scrollable area and scrollbars, ensure the viewport\n  // covers the visible area.\n  function updateScrollTop(cm, val) {\n    if (Math.abs(cm.doc.scrollTop - val) < 2) { return }\n    if (!gecko) { updateDisplaySimple(cm, {top: val}); }\n    setScrollTop(cm, val, true);\n    if (gecko) { updateDisplaySimple(cm); }\n    startWorker(cm, 100);\n  }\n\n  function setScrollTop(cm, val, forceScroll) {\n    val = Math.max(0, Math.min(cm.display.scroller.scrollHeight - cm.display.scroller.clientHeight, val));\n    if (cm.display.scroller.scrollTop == val && !forceScroll) { return }\n    cm.doc.scrollTop = val;\n    cm.display.scrollbars.setScrollTop(val);\n    if (cm.display.scroller.scrollTop != val) { cm.display.scroller.scrollTop = val; }\n  }\n\n  // Sync scroller and scrollbar, ensure the gutter elements are\n  // aligned.\n  function setScrollLeft(cm, val, isScroller, forceScroll) {\n    val = Math.max(0, Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth));\n    if ((isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) && !forceScroll) { return }\n    cm.doc.scrollLeft = val;\n    alignHorizontally(cm);\n    if (cm.display.scroller.scrollLeft != val) { cm.display.scroller.scrollLeft = val; }\n    cm.display.scrollbars.setScrollLeft(val);\n  }\n\n  // SCROLLBARS\n\n  // Prepare DOM reads needed to update the scrollbars. Done in one\n  // shot to minimize update/measure roundtrips.\n  function measureForScrollbars(cm) {\n    var d = cm.display, gutterW = d.gutters.offsetWidth;\n    var docH = Math.round(cm.doc.height + paddingVert(cm.display));\n    return {\n      clientHeight: d.scroller.clientHeight,\n      viewHeight: d.wrapper.clientHeight,\n      scrollWidth: d.scroller.scrollWidth, clientWidth: d.scroller.clientWidth,\n      viewWidth: d.wrapper.clientWidth,\n      barLeft: cm.options.fixedGutter ? gutterW : 0,\n      docHeight: docH,\n      scrollHeight: docH + scrollGap(cm) + d.barHeight,\n      nativeBarWidth: d.nativeBarWidth,\n      gutterWidth: gutterW\n    }\n  }\n\n  var NativeScrollbars = function(place, scroll, cm) {\n    this.cm = cm;\n    var vert = this.vert = elt(\"div\", [elt(\"div\", null, null, \"min-width: 1px\")], \"CodeMirror-vscrollbar\");\n    var horiz = this.horiz = elt(\"div\", [elt(\"div\", null, null, \"height: 100%; min-height: 1px\")], \"CodeMirror-hscrollbar\");\n    vert.tabIndex = horiz.tabIndex = -1;\n    place(vert); place(horiz);\n\n    on(vert, \"scroll\", function () {\n      if (vert.clientHeight) { scroll(vert.scrollTop, \"vertical\"); }\n    });\n    on(horiz, \"scroll\", function () {\n      if (horiz.clientWidth) { scroll(horiz.scrollLeft, \"horizontal\"); }\n    });\n\n    this.checkedZeroWidth = false;\n    // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).\n    if (ie && ie_version < 8) { this.horiz.style.minHeight = this.vert.style.minWidth = \"18px\"; }\n  };\n\n  NativeScrollbars.prototype.update = function (measure) {\n    var needsH = measure.scrollWidth > measure.clientWidth + 1;\n    var needsV = measure.scrollHeight > measure.clientHeight + 1;\n    var sWidth = measure.nativeBarWidth;\n\n    if (needsV) {\n      this.vert.style.display = \"block\";\n      this.vert.style.bottom = needsH ? sWidth + \"px\" : \"0\";\n      var totalHeight = measure.viewHeight - (needsH ? sWidth : 0);\n      // A bug in IE8 can cause this value to be negative, so guard it.\n      this.vert.firstChild.style.height =\n        Math.max(0, measure.scrollHeight - measure.clientHeight + totalHeight) + \"px\";\n    } else {\n      this.vert.style.display = \"\";\n      this.vert.firstChild.style.height = \"0\";\n    }\n\n    if (needsH) {\n      this.horiz.style.display = \"block\";\n      this.horiz.style.right = needsV ? sWidth + \"px\" : \"0\";\n      this.horiz.style.left = measure.barLeft + \"px\";\n      var totalWidth = measure.viewWidth - measure.barLeft - (needsV ? sWidth : 0);\n      this.horiz.firstChild.style.width =\n        Math.max(0, measure.scrollWidth - measure.clientWidth + totalWidth) + \"px\";\n    } else {\n      this.horiz.style.display = \"\";\n      this.horiz.firstChild.style.width = \"0\";\n    }\n\n    if (!this.checkedZeroWidth && measure.clientHeight > 0) {\n      if (sWidth == 0) { this.zeroWidthHack(); }\n      this.checkedZeroWidth = true;\n    }\n\n    return {right: needsV ? sWidth : 0, bottom: needsH ? sWidth : 0}\n  };\n\n  NativeScrollbars.prototype.setScrollLeft = function (pos) {\n    if (this.horiz.scrollLeft != pos) { this.horiz.scrollLeft = pos; }\n    if (this.disableHoriz) { this.enableZeroWidthBar(this.horiz, this.disableHoriz, \"horiz\"); }\n  };\n\n  NativeScrollbars.prototype.setScrollTop = function (pos) {\n    if (this.vert.scrollTop != pos) { this.vert.scrollTop = pos; }\n    if (this.disableVert) { this.enableZeroWidthBar(this.vert, this.disableVert, \"vert\"); }\n  };\n\n  NativeScrollbars.prototype.zeroWidthHack = function () {\n    var w = mac && !mac_geMountainLion ? \"12px\" : \"18px\";\n    this.horiz.style.height = this.vert.style.width = w;\n    this.horiz.style.pointerEvents = this.vert.style.pointerEvents = \"none\";\n    this.disableHoriz = new Delayed;\n    this.disableVert = new Delayed;\n  };\n\n  NativeScrollbars.prototype.enableZeroWidthBar = function (bar, delay, type) {\n    bar.style.pointerEvents = \"auto\";\n    function maybeDisable() {\n      // To find out whether the scrollbar is still visible, we\n      // check whether the element under the pixel in the bottom\n      // right corner of the scrollbar box is the scrollbar box\n      // itself (when the bar is still visible) or its filler child\n      // (when the bar is hidden). If it is still visible, we keep\n      // it enabled, if it's hidden, we disable pointer events.\n      var box = bar.getBoundingClientRect();\n      var elt = type == \"vert\" ? document.elementFromPoint(box.right - 1, (box.top + box.bottom) / 2)\n          : document.elementFromPoint((box.right + box.left) / 2, box.bottom - 1);\n      if (elt != bar) { bar.style.pointerEvents = \"none\"; }\n      else { delay.set(1000, maybeDisable); }\n    }\n    delay.set(1000, maybeDisable);\n  };\n\n  NativeScrollbars.prototype.clear = function () {\n    var parent = this.horiz.parentNode;\n    parent.removeChild(this.horiz);\n    parent.removeChild(this.vert);\n  };\n\n  var NullScrollbars = function () {};\n\n  NullScrollbars.prototype.update = function () { return {bottom: 0, right: 0} };\n  NullScrollbars.prototype.setScrollLeft = function () {};\n  NullScrollbars.prototype.setScrollTop = function () {};\n  NullScrollbars.prototype.clear = function () {};\n\n  function updateScrollbars(cm, measure) {\n    if (!measure) { measure = measureForScrollbars(cm); }\n    var startWidth = cm.display.barWidth, startHeight = cm.display.barHeight;\n    updateScrollbarsInner(cm, measure);\n    for (var i = 0; i < 4 && startWidth != cm.display.barWidth || startHeight != cm.display.barHeight; i++) {\n      if (startWidth != cm.display.barWidth && cm.options.lineWrapping)\n        { updateHeightsInViewport(cm); }\n      updateScrollbarsInner(cm, measureForScrollbars(cm));\n      startWidth = cm.display.barWidth; startHeight = cm.display.barHeight;\n    }\n  }\n\n  // Re-synchronize the fake scrollbars with the actual size of the\n  // content.\n  function updateScrollbarsInner(cm, measure) {\n    var d = cm.display;\n    var sizes = d.scrollbars.update(measure);\n\n    d.sizer.style.paddingRight = (d.barWidth = sizes.right) + \"px\";\n    d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + \"px\";\n    d.heightForcer.style.borderBottom = sizes.bottom + \"px solid transparent\";\n\n    if (sizes.right && sizes.bottom) {\n      d.scrollbarFiller.style.display = \"block\";\n      d.scrollbarFiller.style.height = sizes.bottom + \"px\";\n      d.scrollbarFiller.style.width = sizes.right + \"px\";\n    } else { d.scrollbarFiller.style.display = \"\"; }\n    if (sizes.bottom && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {\n      d.gutterFiller.style.display = \"block\";\n      d.gutterFiller.style.height = sizes.bottom + \"px\";\n      d.gutterFiller.style.width = measure.gutterWidth + \"px\";\n    } else { d.gutterFiller.style.display = \"\"; }\n  }\n\n  var scrollbarModel = {\"native\": NativeScrollbars, \"null\": NullScrollbars};\n\n  function initScrollbars(cm) {\n    if (cm.display.scrollbars) {\n      cm.display.scrollbars.clear();\n      if (cm.display.scrollbars.addClass)\n        { rmClass(cm.display.wrapper, cm.display.scrollbars.addClass); }\n    }\n\n    cm.display.scrollbars = new scrollbarModel[cm.options.scrollbarStyle](function (node) {\n      cm.display.wrapper.insertBefore(node, cm.display.scrollbarFiller);\n      // Prevent clicks in the scrollbars from killing focus\n      on(node, \"mousedown\", function () {\n        if (cm.state.focused) { setTimeout(function () { return cm.display.input.focus(); }, 0); }\n      });\n      node.setAttribute(\"cm-not-content\", \"true\");\n    }, function (pos, axis) {\n      if (axis == \"horizontal\") { setScrollLeft(cm, pos); }\n      else { updateScrollTop(cm, pos); }\n    }, cm);\n    if (cm.display.scrollbars.addClass)\n      { addClass(cm.display.wrapper, cm.display.scrollbars.addClass); }\n  }\n\n  // Operations are used to wrap a series of changes to the editor\n  // state in such a way that each change won't have to update the\n  // cursor and display (which would be awkward, slow, and\n  // error-prone). Instead, display updates are batched and then all\n  // combined and executed at once.\n\n  var nextOpId = 0;\n  // Start a new operation.\n  function startOperation(cm) {\n    cm.curOp = {\n      cm: cm,\n      viewChanged: false,      // Flag that indicates that lines might need to be redrawn\n      startHeight: cm.doc.height, // Used to detect need to update scrollbar\n      forceUpdate: false,      // Used to force a redraw\n      updateInput: 0,       // Whether to reset the input textarea\n      typing: false,           // Whether this reset should be careful to leave existing text (for compositing)\n      changeObjs: null,        // Accumulated changes, for firing change events\n      cursorActivityHandlers: null, // Set of handlers to fire cursorActivity on\n      cursorActivityCalled: 0, // Tracks which cursorActivity handlers have been called already\n      selectionChanged: false, // Whether the selection needs to be redrawn\n      updateMaxLine: false,    // Set when the widest line needs to be determined anew\n      scrollLeft: null, scrollTop: null, // Intermediate scroll position, not pushed to DOM yet\n      scrollToPos: null,       // Used to scroll to a specific position\n      focus: false,\n      id: ++nextOpId           // Unique ID\n    };\n    pushOperation(cm.curOp);\n  }\n\n  // Finish an operation, updating the display and signalling delayed events\n  function endOperation(cm) {\n    var op = cm.curOp;\n    if (op) { finishOperation(op, function (group) {\n      for (var i = 0; i < group.ops.length; i++)\n        { group.ops[i].cm.curOp = null; }\n      endOperations(group);\n    }); }\n  }\n\n  // The DOM updates done when an operation finishes are batched so\n  // that the minimum number of relayouts are required.\n  function endOperations(group) {\n    var ops = group.ops;\n    for (var i = 0; i < ops.length; i++) // Read DOM\n      { endOperation_R1(ops[i]); }\n    for (var i$1 = 0; i$1 < ops.length; i$1++) // Write DOM (maybe)\n      { endOperation_W1(ops[i$1]); }\n    for (var i$2 = 0; i$2 < ops.length; i$2++) // Read DOM\n      { endOperation_R2(ops[i$2]); }\n    for (var i$3 = 0; i$3 < ops.length; i$3++) // Write DOM (maybe)\n      { endOperation_W2(ops[i$3]); }\n    for (var i$4 = 0; i$4 < ops.length; i$4++) // Read DOM\n      { endOperation_finish(ops[i$4]); }\n  }\n\n  function endOperation_R1(op) {\n    var cm = op.cm, display = cm.display;\n    maybeClipScrollbars(cm);\n    if (op.updateMaxLine) { findMaxLine(cm); }\n\n    op.mustUpdate = op.viewChanged || op.forceUpdate || op.scrollTop != null ||\n      op.scrollToPos && (op.scrollToPos.from.line < display.viewFrom ||\n                         op.scrollToPos.to.line >= display.viewTo) ||\n      display.maxLineChanged && cm.options.lineWrapping;\n    op.update = op.mustUpdate &&\n      new DisplayUpdate(cm, op.mustUpdate && {top: op.scrollTop, ensure: op.scrollToPos}, op.forceUpdate);\n  }\n\n  function endOperation_W1(op) {\n    op.updatedDisplay = op.mustUpdate && updateDisplayIfNeeded(op.cm, op.update);\n  }\n\n  function endOperation_R2(op) {\n    var cm = op.cm, display = cm.display;\n    if (op.updatedDisplay) { updateHeightsInViewport(cm); }\n\n    op.barMeasure = measureForScrollbars(cm);\n\n    // If the max line changed since it was last measured, measure it,\n    // and ensure the document's width matches it.\n    // updateDisplay_W2 will use these properties to do the actual resizing\n    if (display.maxLineChanged && !cm.options.lineWrapping) {\n      op.adjustWidthTo = measureChar(cm, display.maxLine, display.maxLine.text.length).left + 3;\n      cm.display.sizerWidth = op.adjustWidthTo;\n      op.barMeasure.scrollWidth =\n        Math.max(display.scroller.clientWidth, display.sizer.offsetLeft + op.adjustWidthTo + scrollGap(cm) + cm.display.barWidth);\n      op.maxScrollLeft = Math.max(0, display.sizer.offsetLeft + op.adjustWidthTo - displayWidth(cm));\n    }\n\n    if (op.updatedDisplay || op.selectionChanged)\n      { op.preparedSelection = display.input.prepareSelection(); }\n  }\n\n  function endOperation_W2(op) {\n    var cm = op.cm;\n\n    if (op.adjustWidthTo != null) {\n      cm.display.sizer.style.minWidth = op.adjustWidthTo + \"px\";\n      if (op.maxScrollLeft < cm.doc.scrollLeft)\n        { setScrollLeft(cm, Math.min(cm.display.scroller.scrollLeft, op.maxScrollLeft), true); }\n      cm.display.maxLineChanged = false;\n    }\n\n    var takeFocus = op.focus && op.focus == activeElt();\n    if (op.preparedSelection)\n      { cm.display.input.showSelection(op.preparedSelection, takeFocus); }\n    if (op.updatedDisplay || op.startHeight != cm.doc.height)\n      { updateScrollbars(cm, op.barMeasure); }\n    if (op.updatedDisplay)\n      { setDocumentHeight(cm, op.barMeasure); }\n\n    if (op.selectionChanged) { restartBlink(cm); }\n\n    if (cm.state.focused && op.updateInput)\n      { cm.display.input.reset(op.typing); }\n    if (takeFocus) { ensureFocus(op.cm); }\n  }\n\n  function endOperation_finish(op) {\n    var cm = op.cm, display = cm.display, doc = cm.doc;\n\n    if (op.updatedDisplay) { postUpdateDisplay(cm, op.update); }\n\n    // Abort mouse wheel delta measurement, when scrolling explicitly\n    if (display.wheelStartX != null && (op.scrollTop != null || op.scrollLeft != null || op.scrollToPos))\n      { display.wheelStartX = display.wheelStartY = null; }\n\n    // Propagate the scroll position to the actual DOM scroller\n    if (op.scrollTop != null) { setScrollTop(cm, op.scrollTop, op.forceScroll); }\n\n    if (op.scrollLeft != null) { setScrollLeft(cm, op.scrollLeft, true, true); }\n    // If we need to scroll a specific position into view, do so.\n    if (op.scrollToPos) {\n      var rect = scrollPosIntoView(cm, clipPos(doc, op.scrollToPos.from),\n                                   clipPos(doc, op.scrollToPos.to), op.scrollToPos.margin);\n      maybeScrollWindow(cm, rect);\n    }\n\n    // Fire events for markers that are hidden/unidden by editing or\n    // undoing\n    var hidden = op.maybeHiddenMarkers, unhidden = op.maybeUnhiddenMarkers;\n    if (hidden) { for (var i = 0; i < hidden.length; ++i)\n      { if (!hidden[i].lines.length) { signal(hidden[i], \"hide\"); } } }\n    if (unhidden) { for (var i$1 = 0; i$1 < unhidden.length; ++i$1)\n      { if (unhidden[i$1].lines.length) { signal(unhidden[i$1], \"unhide\"); } } }\n\n    if (display.wrapper.offsetHeight)\n      { doc.scrollTop = cm.display.scroller.scrollTop; }\n\n    // Fire change events, and delayed event handlers\n    if (op.changeObjs)\n      { signal(cm, \"changes\", cm, op.changeObjs); }\n    if (op.update)\n      { op.update.finish(); }\n  }\n\n  // Run the given function in an operation\n  function runInOp(cm, f) {\n    if (cm.curOp) { return f() }\n    startOperation(cm);\n    try { return f() }\n    finally { endOperation(cm); }\n  }\n  // Wraps a function in an operation. Returns the wrapped function.\n  function operation(cm, f) {\n    return function() {\n      if (cm.curOp) { return f.apply(cm, arguments) }\n      startOperation(cm);\n      try { return f.apply(cm, arguments) }\n      finally { endOperation(cm); }\n    }\n  }\n  // Used to add methods to editor and doc instances, wrapping them in\n  // operations.\n  function methodOp(f) {\n    return function() {\n      if (this.curOp) { return f.apply(this, arguments) }\n      startOperation(this);\n      try { return f.apply(this, arguments) }\n      finally { endOperation(this); }\n    }\n  }\n  function docMethodOp(f) {\n    return function() {\n      var cm = this.cm;\n      if (!cm || cm.curOp) { return f.apply(this, arguments) }\n      startOperation(cm);\n      try { return f.apply(this, arguments) }\n      finally { endOperation(cm); }\n    }\n  }\n\n  // HIGHLIGHT WORKER\n\n  function startWorker(cm, time) {\n    if (cm.doc.highlightFrontier < cm.display.viewTo)\n      { cm.state.highlight.set(time, bind(highlightWorker, cm)); }\n  }\n\n  function highlightWorker(cm) {\n    var doc = cm.doc;\n    if (doc.highlightFrontier >= cm.display.viewTo) { return }\n    var end = +new Date + cm.options.workTime;\n    var context = getContextBefore(cm, doc.highlightFrontier);\n    var changedLines = [];\n\n    doc.iter(context.line, Math.min(doc.first + doc.size, cm.display.viewTo + 500), function (line) {\n      if (context.line >= cm.display.viewFrom) { // Visible\n        var oldStyles = line.styles;\n        var resetState = line.text.length > cm.options.maxHighlightLength ? copyState(doc.mode, context.state) : null;\n        var highlighted = highlightLine(cm, line, context, true);\n        if (resetState) { context.state = resetState; }\n        line.styles = highlighted.styles;\n        var oldCls = line.styleClasses, newCls = highlighted.classes;\n        if (newCls) { line.styleClasses = newCls; }\n        else if (oldCls) { line.styleClasses = null; }\n        var ischange = !oldStyles || oldStyles.length != line.styles.length ||\n          oldCls != newCls && (!oldCls || !newCls || oldCls.bgClass != newCls.bgClass || oldCls.textClass != newCls.textClass);\n        for (var i = 0; !ischange && i < oldStyles.length; ++i) { ischange = oldStyles[i] != line.styles[i]; }\n        if (ischange) { changedLines.push(context.line); }\n        line.stateAfter = context.save();\n        context.nextLine();\n      } else {\n        if (line.text.length <= cm.options.maxHighlightLength)\n          { processLine(cm, line.text, context); }\n        line.stateAfter = context.line % 5 == 0 ? context.save() : null;\n        context.nextLine();\n      }\n      if (+new Date > end) {\n        startWorker(cm, cm.options.workDelay);\n        return true\n      }\n    });\n    doc.highlightFrontier = context.line;\n    doc.modeFrontier = Math.max(doc.modeFrontier, context.line);\n    if (changedLines.length) { runInOp(cm, function () {\n      for (var i = 0; i < changedLines.length; i++)\n        { regLineChange(cm, changedLines[i], \"text\"); }\n    }); }\n  }\n\n  // DISPLAY DRAWING\n\n  var DisplayUpdate = function(cm, viewport, force) {\n    var display = cm.display;\n\n    this.viewport = viewport;\n    // Store some values that we'll need later (but don't want to force a relayout for)\n    this.visible = visibleLines(display, cm.doc, viewport);\n    this.editorIsHidden = !display.wrapper.offsetWidth;\n    this.wrapperHeight = display.wrapper.clientHeight;\n    this.wrapperWidth = display.wrapper.clientWidth;\n    this.oldDisplayWidth = displayWidth(cm);\n    this.force = force;\n    this.dims = getDimensions(cm);\n    this.events = [];\n  };\n\n  DisplayUpdate.prototype.signal = function (emitter, type) {\n    if (hasHandler(emitter, type))\n      { this.events.push(arguments); }\n  };\n  DisplayUpdate.prototype.finish = function () {\n    for (var i = 0; i < this.events.length; i++)\n      { signal.apply(null, this.events[i]); }\n  };\n\n  function maybeClipScrollbars(cm) {\n    var display = cm.display;\n    if (!display.scrollbarsClipped && display.scroller.offsetWidth) {\n      display.nativeBarWidth = display.scroller.offsetWidth - display.scroller.clientWidth;\n      display.heightForcer.style.height = scrollGap(cm) + \"px\";\n      display.sizer.style.marginBottom = -display.nativeBarWidth + \"px\";\n      display.sizer.style.borderRightWidth = scrollGap(cm) + \"px\";\n      display.scrollbarsClipped = true;\n    }\n  }\n\n  function selectionSnapshot(cm) {\n    if (cm.hasFocus()) { return null }\n    var active = activeElt();\n    if (!active || !contains(cm.display.lineDiv, active)) { return null }\n    var result = {activeElt: active};\n    if (window.getSelection) {\n      var sel = window.getSelection();\n      if (sel.anchorNode && sel.extend && contains(cm.display.lineDiv, sel.anchorNode)) {\n        result.anchorNode = sel.anchorNode;\n        result.anchorOffset = sel.anchorOffset;\n        result.focusNode = sel.focusNode;\n        result.focusOffset = sel.focusOffset;\n      }\n    }\n    return result\n  }\n\n  function restoreSelection(snapshot) {\n    if (!snapshot || !snapshot.activeElt || snapshot.activeElt == activeElt()) { return }\n    snapshot.activeElt.focus();\n    if (!/^(INPUT|TEXTAREA)$/.test(snapshot.activeElt.nodeName) &&\n        snapshot.anchorNode && contains(document.body, snapshot.anchorNode) && contains(document.body, snapshot.focusNode)) {\n      var sel = window.getSelection(), range = document.createRange();\n      range.setEnd(snapshot.anchorNode, snapshot.anchorOffset);\n      range.collapse(false);\n      sel.removeAllRanges();\n      sel.addRange(range);\n      sel.extend(snapshot.focusNode, snapshot.focusOffset);\n    }\n  }\n\n  // Does the actual updating of the line display. Bails out\n  // (returning false) when there is nothing to be done and forced is\n  // false.\n  function updateDisplayIfNeeded(cm, update) {\n    var display = cm.display, doc = cm.doc;\n\n    if (update.editorIsHidden) {\n      resetView(cm);\n      return false\n    }\n\n    // Bail out if the visible area is already rendered and nothing changed.\n    if (!update.force &&\n        update.visible.from >= display.viewFrom && update.visible.to <= display.viewTo &&\n        (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo) &&\n        display.renderedView == display.view && countDirtyView(cm) == 0)\n      { return false }\n\n    if (maybeUpdateLineNumberWidth(cm)) {\n      resetView(cm);\n      update.dims = getDimensions(cm);\n    }\n\n    // Compute a suitable new viewport (from & to)\n    var end = doc.first + doc.size;\n    var from = Math.max(update.visible.from - cm.options.viewportMargin, doc.first);\n    var to = Math.min(end, update.visible.to + cm.options.viewportMargin);\n    if (display.viewFrom < from && from - display.viewFrom < 20) { from = Math.max(doc.first, display.viewFrom); }\n    if (display.viewTo > to && display.viewTo - to < 20) { to = Math.min(end, display.viewTo); }\n    if (sawCollapsedSpans) {\n      from = visualLineNo(cm.doc, from);\n      to = visualLineEndNo(cm.doc, to);\n    }\n\n    var different = from != display.viewFrom || to != display.viewTo ||\n      display.lastWrapHeight != update.wrapperHeight || display.lastWrapWidth != update.wrapperWidth;\n    adjustView(cm, from, to);\n\n    display.viewOffset = heightAtLine(getLine(cm.doc, display.viewFrom));\n    // Position the mover div to align with the current scroll position\n    cm.display.mover.style.top = display.viewOffset + \"px\";\n\n    var toUpdate = countDirtyView(cm);\n    if (!different && toUpdate == 0 && !update.force && display.renderedView == display.view &&\n        (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo))\n      { return false }\n\n    // For big changes, we hide the enclosing element during the\n    // update, since that speeds up the operations on most browsers.\n    var selSnapshot = selectionSnapshot(cm);\n    if (toUpdate > 4) { display.lineDiv.style.display = \"none\"; }\n    patchDisplay(cm, display.updateLineNumbers, update.dims);\n    if (toUpdate > 4) { display.lineDiv.style.display = \"\"; }\n    display.renderedView = display.view;\n    // There might have been a widget with a focused element that got\n    // hidden or updated, if so re-focus it.\n    restoreSelection(selSnapshot);\n\n    // Prevent selection and cursors from interfering with the scroll\n    // width and height.\n    removeChildren(display.cursorDiv);\n    removeChildren(display.selectionDiv);\n    display.gutters.style.height = display.sizer.style.minHeight = 0;\n\n    if (different) {\n      display.lastWrapHeight = update.wrapperHeight;\n      display.lastWrapWidth = update.wrapperWidth;\n      startWorker(cm, 400);\n    }\n\n    display.updateLineNumbers = null;\n\n    return true\n  }\n\n  function postUpdateDisplay(cm, update) {\n    var viewport = update.viewport;\n\n    for (var first = true;; first = false) {\n      if (!first || !cm.options.lineWrapping || update.oldDisplayWidth == displayWidth(cm)) {\n        // Clip forced viewport to actual scrollable area.\n        if (viewport && viewport.top != null)\n          { viewport = {top: Math.min(cm.doc.height + paddingVert(cm.display) - displayHeight(cm), viewport.top)}; }\n        // Updated line heights might result in the drawn area not\n        // actually covering the viewport. Keep looping until it does.\n        update.visible = visibleLines(cm.display, cm.doc, viewport);\n        if (update.visible.from >= cm.display.viewFrom && update.visible.to <= cm.display.viewTo)\n          { break }\n      } else if (first) {\n        update.visible = visibleLines(cm.display, cm.doc, viewport);\n      }\n      if (!updateDisplayIfNeeded(cm, update)) { break }\n      updateHeightsInViewport(cm);\n      var barMeasure = measureForScrollbars(cm);\n      updateSelection(cm);\n      updateScrollbars(cm, barMeasure);\n      setDocumentHeight(cm, barMeasure);\n      update.force = false;\n    }\n\n    update.signal(cm, \"update\", cm);\n    if (cm.display.viewFrom != cm.display.reportedViewFrom || cm.display.viewTo != cm.display.reportedViewTo) {\n      update.signal(cm, \"viewportChange\", cm, cm.display.viewFrom, cm.display.viewTo);\n      cm.display.reportedViewFrom = cm.display.viewFrom; cm.display.reportedViewTo = cm.display.viewTo;\n    }\n  }\n\n  function updateDisplaySimple(cm, viewport) {\n    var update = new DisplayUpdate(cm, viewport);\n    if (updateDisplayIfNeeded(cm, update)) {\n      updateHeightsInViewport(cm);\n      postUpdateDisplay(cm, update);\n      var barMeasure = measureForScrollbars(cm);\n      updateSelection(cm);\n      updateScrollbars(cm, barMeasure);\n      setDocumentHeight(cm, barMeasure);\n      update.finish();\n    }\n  }\n\n  // Sync the actual display DOM structure with display.view, removing\n  // nodes for lines that are no longer in view, and creating the ones\n  // that are not there yet, and updating the ones that are out of\n  // date.\n  function patchDisplay(cm, updateNumbersFrom, dims) {\n    var display = cm.display, lineNumbers = cm.options.lineNumbers;\n    var container = display.lineDiv, cur = container.firstChild;\n\n    function rm(node) {\n      var next = node.nextSibling;\n      // Works around a throw-scroll bug in OS X Webkit\n      if (webkit && mac && cm.display.currentWheelTarget == node)\n        { node.style.display = \"none\"; }\n      else\n        { node.parentNode.removeChild(node); }\n      return next\n    }\n\n    var view = display.view, lineN = display.viewFrom;\n    // Loop over the elements in the view, syncing cur (the DOM nodes\n    // in display.lineDiv) with the view as we go.\n    for (var i = 0; i < view.length; i++) {\n      var lineView = view[i];\n      if (lineView.hidden) ; else if (!lineView.node || lineView.node.parentNode != container) { // Not drawn yet\n        var node = buildLineElement(cm, lineView, lineN, dims);\n        container.insertBefore(node, cur);\n      } else { // Already drawn\n        while (cur != lineView.node) { cur = rm(cur); }\n        var updateNumber = lineNumbers && updateNumbersFrom != null &&\n          updateNumbersFrom <= lineN && lineView.lineNumber;\n        if (lineView.changes) {\n          if (indexOf(lineView.changes, \"gutter\") > -1) { updateNumber = false; }\n          updateLineForChanges(cm, lineView, lineN, dims);\n        }\n        if (updateNumber) {\n          removeChildren(lineView.lineNumber);\n          lineView.lineNumber.appendChild(document.createTextNode(lineNumberFor(cm.options, lineN)));\n        }\n        cur = lineView.node.nextSibling;\n      }\n      lineN += lineView.size;\n    }\n    while (cur) { cur = rm(cur); }\n  }\n\n  function updateGutterSpace(display) {\n    var width = display.gutters.offsetWidth;\n    display.sizer.style.marginLeft = width + \"px\";\n  }\n\n  function setDocumentHeight(cm, measure) {\n    cm.display.sizer.style.minHeight = measure.docHeight + \"px\";\n    cm.display.heightForcer.style.top = measure.docHeight + \"px\";\n    cm.display.gutters.style.height = (measure.docHeight + cm.display.barHeight + scrollGap(cm)) + \"px\";\n  }\n\n  // Re-align line numbers and gutter marks to compensate for\n  // horizontal scrolling.\n  function alignHorizontally(cm) {\n    var display = cm.display, view = display.view;\n    if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) { return }\n    var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft;\n    var gutterW = display.gutters.offsetWidth, left = comp + \"px\";\n    for (var i = 0; i < view.length; i++) { if (!view[i].hidden) {\n      if (cm.options.fixedGutter) {\n        if (view[i].gutter)\n          { view[i].gutter.style.left = left; }\n        if (view[i].gutterBackground)\n          { view[i].gutterBackground.style.left = left; }\n      }\n      var align = view[i].alignable;\n      if (align) { for (var j = 0; j < align.length; j++)\n        { align[j].style.left = left; } }\n    } }\n    if (cm.options.fixedGutter)\n      { display.gutters.style.left = (comp + gutterW) + \"px\"; }\n  }\n\n  // Used to ensure that the line number gutter is still the right\n  // size for the current document size. Returns true when an update\n  // is needed.\n  function maybeUpdateLineNumberWidth(cm) {\n    if (!cm.options.lineNumbers) { return false }\n    var doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display;\n    if (last.length != display.lineNumChars) {\n      var test = display.measure.appendChild(elt(\"div\", [elt(\"div\", last)],\n                                                 \"CodeMirror-linenumber CodeMirror-gutter-elt\"));\n      var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW;\n      display.lineGutter.style.width = \"\";\n      display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding) + 1;\n      display.lineNumWidth = display.lineNumInnerWidth + padding;\n      display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;\n      display.lineGutter.style.width = display.lineNumWidth + \"px\";\n      updateGutterSpace(cm.display);\n      return true\n    }\n    return false\n  }\n\n  function getGutters(gutters, lineNumbers) {\n    var result = [], sawLineNumbers = false;\n    for (var i = 0; i < gutters.length; i++) {\n      var name = gutters[i], style = null;\n      if (typeof name != \"string\") { style = name.style; name = name.className; }\n      if (name == \"CodeMirror-linenumbers\") {\n        if (!lineNumbers) { continue }\n        else { sawLineNumbers = true; }\n      }\n      result.push({className: name, style: style});\n    }\n    if (lineNumbers && !sawLineNumbers) { result.push({className: \"CodeMirror-linenumbers\", style: null}); }\n    return result\n  }\n\n  // Rebuild the gutter elements, ensure the margin to the left of the\n  // code matches their width.\n  function renderGutters(display) {\n    var gutters = display.gutters, specs = display.gutterSpecs;\n    removeChildren(gutters);\n    display.lineGutter = null;\n    for (var i = 0; i < specs.length; ++i) {\n      var ref = specs[i];\n      var className = ref.className;\n      var style = ref.style;\n      var gElt = gutters.appendChild(elt(\"div\", null, \"CodeMirror-gutter \" + className));\n      if (style) { gElt.style.cssText = style; }\n      if (className == \"CodeMirror-linenumbers\") {\n        display.lineGutter = gElt;\n        gElt.style.width = (display.lineNumWidth || 1) + \"px\";\n      }\n    }\n    gutters.style.display = specs.length ? \"\" : \"none\";\n    updateGutterSpace(display);\n  }\n\n  function updateGutters(cm) {\n    renderGutters(cm.display);\n    regChange(cm);\n    alignHorizontally(cm);\n  }\n\n  // The display handles the DOM integration, both for input reading\n  // and content drawing. It holds references to DOM nodes and\n  // display-related state.\n\n  function Display(place, doc, input, options) {\n    var d = this;\n    this.input = input;\n\n    // Covers bottom-right square when both scrollbars are present.\n    d.scrollbarFiller = elt(\"div\", null, \"CodeMirror-scrollbar-filler\");\n    d.scrollbarFiller.setAttribute(\"cm-not-content\", \"true\");\n    // Covers bottom of gutter when coverGutterNextToScrollbar is on\n    // and h scrollbar is present.\n    d.gutterFiller = elt(\"div\", null, \"CodeMirror-gutter-filler\");\n    d.gutterFiller.setAttribute(\"cm-not-content\", \"true\");\n    // Will contain the actual code, positioned to cover the viewport.\n    d.lineDiv = eltP(\"div\", null, \"CodeMirror-code\");\n    // Elements are added to these to represent selection and cursors.\n    d.selectionDiv = elt(\"div\", null, null, \"position: relative; z-index: 1\");\n    d.cursorDiv = elt(\"div\", null, \"CodeMirror-cursors\");\n    // A visibility: hidden element used to find the size of things.\n    d.measure = elt(\"div\", null, \"CodeMirror-measure\");\n    // When lines outside of the viewport are measured, they are drawn in this.\n    d.lineMeasure = elt(\"div\", null, \"CodeMirror-measure\");\n    // Wraps everything that needs to exist inside the vertically-padded coordinate system\n    d.lineSpace = eltP(\"div\", [d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv],\n                      null, \"position: relative; outline: none\");\n    var lines = eltP(\"div\", [d.lineSpace], \"CodeMirror-lines\");\n    // Moved around its parent to cover visible view.\n    d.mover = elt(\"div\", [lines], null, \"position: relative\");\n    // Set to the height of the document, allowing scrolling.\n    d.sizer = elt(\"div\", [d.mover], \"CodeMirror-sizer\");\n    d.sizerWidth = null;\n    // Behavior of elts with overflow: auto and padding is\n    // inconsistent across browsers. This is used to ensure the\n    // scrollable area is big enough.\n    d.heightForcer = elt(\"div\", null, null, \"position: absolute; height: \" + scrollerGap + \"px; width: 1px;\");\n    // Will contain the gutters, if any.\n    d.gutters = elt(\"div\", null, \"CodeMirror-gutters\");\n    d.lineGutter = null;\n    // Actual scrollable element.\n    d.scroller = elt(\"div\", [d.sizer, d.heightForcer, d.gutters], \"CodeMirror-scroll\");\n    d.scroller.setAttribute(\"tabIndex\", \"-1\");\n    // The element in which the editor lives.\n    d.wrapper = elt(\"div\", [d.scrollbarFiller, d.gutterFiller, d.scroller], \"CodeMirror\");\n\n    // Work around IE7 z-index bug (not perfect, hence IE7 not really being supported)\n    if (ie && ie_version < 8) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0; }\n    if (!webkit && !(gecko && mobile)) { d.scroller.draggable = true; }\n\n    if (place) {\n      if (place.appendChild) { place.appendChild(d.wrapper); }\n      else { place(d.wrapper); }\n    }\n\n    // Current rendered range (may be bigger than the view window).\n    d.viewFrom = d.viewTo = doc.first;\n    d.reportedViewFrom = d.reportedViewTo = doc.first;\n    // Information about the rendered lines.\n    d.view = [];\n    d.renderedView = null;\n    // Holds info about a single rendered line when it was rendered\n    // for measurement, while not in view.\n    d.externalMeasured = null;\n    // Empty space (in pixels) above the view\n    d.viewOffset = 0;\n    d.lastWrapHeight = d.lastWrapWidth = 0;\n    d.updateLineNumbers = null;\n\n    d.nativeBarWidth = d.barHeight = d.barWidth = 0;\n    d.scrollbarsClipped = false;\n\n    // Used to only resize the line number gutter when necessary (when\n    // the amount of lines crosses a boundary that makes its width change)\n    d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;\n    // Set to true when a non-horizontal-scrolling line widget is\n    // added. As an optimization, line widget aligning is skipped when\n    // this is false.\n    d.alignWidgets = false;\n\n    d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;\n\n    // Tracks the maximum line length so that the horizontal scrollbar\n    // can be kept static when scrolling.\n    d.maxLine = null;\n    d.maxLineLength = 0;\n    d.maxLineChanged = false;\n\n    // Used for measuring wheel scrolling granularity\n    d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null;\n\n    // True when shift is held down.\n    d.shift = false;\n\n    // Used to track whether anything happened since the context menu\n    // was opened.\n    d.selForContextMenu = null;\n\n    d.activeTouch = null;\n\n    d.gutterSpecs = getGutters(options.gutters, options.lineNumbers);\n    renderGutters(d);\n\n    input.init(d);\n  }\n\n  // Since the delta values reported on mouse wheel events are\n  // unstandardized between browsers and even browser versions, and\n  // generally horribly unpredictable, this code starts by measuring\n  // the scroll effect that the first few mouse wheel events have,\n  // and, from that, detects the way it can convert deltas to pixel\n  // offsets afterwards.\n  //\n  // The reason we want to know the amount a wheel event will scroll\n  // is that it gives us a chance to update the display before the\n  // actual scrolling happens, reducing flickering.\n\n  var wheelSamples = 0, wheelPixelsPerUnit = null;\n  // Fill in a browser-detected starting value on browsers where we\n  // know one. These don't have to be accurate -- the result of them\n  // being wrong would just be a slight flicker on the first wheel\n  // scroll (if it is large enough).\n  if (ie) { wheelPixelsPerUnit = -.53; }\n  else if (gecko) { wheelPixelsPerUnit = 15; }\n  else if (chrome) { wheelPixelsPerUnit = -.7; }\n  else if (safari) { wheelPixelsPerUnit = -1/3; }\n\n  function wheelEventDelta(e) {\n    var dx = e.wheelDeltaX, dy = e.wheelDeltaY;\n    if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) { dx = e.detail; }\n    if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) { dy = e.detail; }\n    else if (dy == null) { dy = e.wheelDelta; }\n    return {x: dx, y: dy}\n  }\n  function wheelEventPixels(e) {\n    var delta = wheelEventDelta(e);\n    delta.x *= wheelPixelsPerUnit;\n    delta.y *= wheelPixelsPerUnit;\n    return delta\n  }\n\n  function onScrollWheel(cm, e) {\n    var delta = wheelEventDelta(e), dx = delta.x, dy = delta.y;\n\n    var display = cm.display, scroll = display.scroller;\n    // Quit if there's nothing to scroll here\n    var canScrollX = scroll.scrollWidth > scroll.clientWidth;\n    var canScrollY = scroll.scrollHeight > scroll.clientHeight;\n    if (!(dx && canScrollX || dy && canScrollY)) { return }\n\n    // Webkit browsers on OS X abort momentum scrolls when the target\n    // of the scroll event is removed from the scrollable element.\n    // This hack (see related code in patchDisplay) makes sure the\n    // element is kept around.\n    if (dy && mac && webkit) {\n      outer: for (var cur = e.target, view = display.view; cur != scroll; cur = cur.parentNode) {\n        for (var i = 0; i < view.length; i++) {\n          if (view[i].node == cur) {\n            cm.display.currentWheelTarget = cur;\n            break outer\n          }\n        }\n      }\n    }\n\n    // On some browsers, horizontal scrolling will cause redraws to\n    // happen before the gutter has been realigned, causing it to\n    // wriggle around in a most unseemly way. When we have an\n    // estimated pixels/delta value, we just handle horizontal\n    // scrolling entirely here. It'll be slightly off from native, but\n    // better than glitching out.\n    if (dx && !gecko && !presto && wheelPixelsPerUnit != null) {\n      if (dy && canScrollY)\n        { updateScrollTop(cm, Math.max(0, scroll.scrollTop + dy * wheelPixelsPerUnit)); }\n      setScrollLeft(cm, Math.max(0, scroll.scrollLeft + dx * wheelPixelsPerUnit));\n      // Only prevent default scrolling if vertical scrolling is\n      // actually possible. Otherwise, it causes vertical scroll\n      // jitter on OSX trackpads when deltaX is small and deltaY\n      // is large (issue #3579)\n      if (!dy || (dy && canScrollY))\n        { e_preventDefault(e); }\n      display.wheelStartX = null; // Abort measurement, if in progress\n      return\n    }\n\n    // 'Project' the visible viewport to cover the area that is being\n    // scrolled into view (if we know enough to estimate it).\n    if (dy && wheelPixelsPerUnit != null) {\n      var pixels = dy * wheelPixelsPerUnit;\n      var top = cm.doc.scrollTop, bot = top + display.wrapper.clientHeight;\n      if (pixels < 0) { top = Math.max(0, top + pixels - 50); }\n      else { bot = Math.min(cm.doc.height, bot + pixels + 50); }\n      updateDisplaySimple(cm, {top: top, bottom: bot});\n    }\n\n    if (wheelSamples < 20) {\n      if (display.wheelStartX == null) {\n        display.wheelStartX = scroll.scrollLeft; display.wheelStartY = scroll.scrollTop;\n        display.wheelDX = dx; display.wheelDY = dy;\n        setTimeout(function () {\n          if (display.wheelStartX == null) { return }\n          var movedX = scroll.scrollLeft - display.wheelStartX;\n          var movedY = scroll.scrollTop - display.wheelStartY;\n          var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||\n            (movedX && display.wheelDX && movedX / display.wheelDX);\n          display.wheelStartX = display.wheelStartY = null;\n          if (!sample) { return }\n          wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1);\n          ++wheelSamples;\n        }, 200);\n      } else {\n        display.wheelDX += dx; display.wheelDY += dy;\n      }\n    }\n  }\n\n  // Selection objects are immutable. A new one is created every time\n  // the selection changes. A selection is one or more non-overlapping\n  // (and non-touching) ranges, sorted, and an integer that indicates\n  // which one is the primary selection (the one that's scrolled into\n  // view, that getCursor returns, etc).\n  var Selection = function(ranges, primIndex) {\n    this.ranges = ranges;\n    this.primIndex = primIndex;\n  };\n\n  Selection.prototype.primary = function () { return this.ranges[this.primIndex] };\n\n  Selection.prototype.equals = function (other) {\n    if (other == this) { return true }\n    if (other.primIndex != this.primIndex || other.ranges.length != this.ranges.length) { return false }\n    for (var i = 0; i < this.ranges.length; i++) {\n      var here = this.ranges[i], there = other.ranges[i];\n      if (!equalCursorPos(here.anchor, there.anchor) || !equalCursorPos(here.head, there.head)) { return false }\n    }\n    return true\n  };\n\n  Selection.prototype.deepCopy = function () {\n    var out = [];\n    for (var i = 0; i < this.ranges.length; i++)\n      { out[i] = new Range(copyPos(this.ranges[i].anchor), copyPos(this.ranges[i].head)); }\n    return new Selection(out, this.primIndex)\n  };\n\n  Selection.prototype.somethingSelected = function () {\n    for (var i = 0; i < this.ranges.length; i++)\n      { if (!this.ranges[i].empty()) { return true } }\n    return false\n  };\n\n  Selection.prototype.contains = function (pos, end) {\n    if (!end) { end = pos; }\n    for (var i = 0; i < this.ranges.length; i++) {\n      var range = this.ranges[i];\n      if (cmp(end, range.from()) >= 0 && cmp(pos, range.to()) <= 0)\n        { return i }\n    }\n    return -1\n  };\n\n  var Range = function(anchor, head) {\n    this.anchor = anchor; this.head = head;\n  };\n\n  Range.prototype.from = function () { return minPos(this.anchor, this.head) };\n  Range.prototype.to = function () { return maxPos(this.anchor, this.head) };\n  Range.prototype.empty = function () { return this.head.line == this.anchor.line && this.head.ch == this.anchor.ch };\n\n  // Take an unsorted, potentially overlapping set of ranges, and\n  // build a selection out of it. 'Consumes' ranges array (modifying\n  // it).\n  function normalizeSelection(cm, ranges, primIndex) {\n    var mayTouch = cm && cm.options.selectionsMayTouch;\n    var prim = ranges[primIndex];\n    ranges.sort(function (a, b) { return cmp(a.from(), b.from()); });\n    primIndex = indexOf(ranges, prim);\n    for (var i = 1; i < ranges.length; i++) {\n      var cur = ranges[i], prev = ranges[i - 1];\n      var diff = cmp(prev.to(), cur.from());\n      if (mayTouch && !cur.empty() ? diff > 0 : diff >= 0) {\n        var from = minPos(prev.from(), cur.from()), to = maxPos(prev.to(), cur.to());\n        var inv = prev.empty() ? cur.from() == cur.head : prev.from() == prev.head;\n        if (i <= primIndex) { --primIndex; }\n        ranges.splice(--i, 2, new Range(inv ? to : from, inv ? from : to));\n      }\n    }\n    return new Selection(ranges, primIndex)\n  }\n\n  function simpleSelection(anchor, head) {\n    return new Selection([new Range(anchor, head || anchor)], 0)\n  }\n\n  // Compute the position of the end of a change (its 'to' property\n  // refers to the pre-change end).\n  function changeEnd(change) {\n    if (!change.text) { return change.to }\n    return Pos(change.from.line + change.text.length - 1,\n               lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0))\n  }\n\n  // Adjust a position to refer to the post-change position of the\n  // same text, or the end of the change if the change covers it.\n  function adjustForChange(pos, change) {\n    if (cmp(pos, change.from) < 0) { return pos }\n    if (cmp(pos, change.to) <= 0) { return changeEnd(change) }\n\n    var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch;\n    if (pos.line == change.to.line) { ch += changeEnd(change).ch - change.to.ch; }\n    return Pos(line, ch)\n  }\n\n  function computeSelAfterChange(doc, change) {\n    var out = [];\n    for (var i = 0; i < doc.sel.ranges.length; i++) {\n      var range = doc.sel.ranges[i];\n      out.push(new Range(adjustForChange(range.anchor, change),\n                         adjustForChange(range.head, change)));\n    }\n    return normalizeSelection(doc.cm, out, doc.sel.primIndex)\n  }\n\n  function offsetPos(pos, old, nw) {\n    if (pos.line == old.line)\n      { return Pos(nw.line, pos.ch - old.ch + nw.ch) }\n    else\n      { return Pos(nw.line + (pos.line - old.line), pos.ch) }\n  }\n\n  // Used by replaceSelections to allow moving the selection to the\n  // start or around the replaced test. Hint may be \"start\" or \"around\".\n  function computeReplacedSel(doc, changes, hint) {\n    var out = [];\n    var oldPrev = Pos(doc.first, 0), newPrev = oldPrev;\n    for (var i = 0; i < changes.length; i++) {\n      var change = changes[i];\n      var from = offsetPos(change.from, oldPrev, newPrev);\n      var to = offsetPos(changeEnd(change), oldPrev, newPrev);\n      oldPrev = change.to;\n      newPrev = to;\n      if (hint == \"around\") {\n        var range = doc.sel.ranges[i], inv = cmp(range.head, range.anchor) < 0;\n        out[i] = new Range(inv ? to : from, inv ? from : to);\n      } else {\n        out[i] = new Range(from, from);\n      }\n    }\n    return new Selection(out, doc.sel.primIndex)\n  }\n\n  // Used to get the editor into a consistent state again when options change.\n\n  function loadMode(cm) {\n    cm.doc.mode = getMode(cm.options, cm.doc.modeOption);\n    resetModeState(cm);\n  }\n\n  function resetModeState(cm) {\n    cm.doc.iter(function (line) {\n      if (line.stateAfter) { line.stateAfter = null; }\n      if (line.styles) { line.styles = null; }\n    });\n    cm.doc.modeFrontier = cm.doc.highlightFrontier = cm.doc.first;\n    startWorker(cm, 100);\n    cm.state.modeGen++;\n    if (cm.curOp) { regChange(cm); }\n  }\n\n  // DOCUMENT DATA STRUCTURE\n\n  // By default, updates that start and end at the beginning of a line\n  // are treated specially, in order to make the association of line\n  // widgets and marker elements with the text behave more intuitive.\n  function isWholeLineUpdate(doc, change) {\n    return change.from.ch == 0 && change.to.ch == 0 && lst(change.text) == \"\" &&\n      (!doc.cm || doc.cm.options.wholeLineUpdateBefore)\n  }\n\n  // Perform a change on the document data structure.\n  function updateDoc(doc, change, markedSpans, estimateHeight) {\n    function spansFor(n) {return markedSpans ? markedSpans[n] : null}\n    function update(line, text, spans) {\n      updateLine(line, text, spans, estimateHeight);\n      signalLater(line, \"change\", line, change);\n    }\n    function linesFor(start, end) {\n      var result = [];\n      for (var i = start; i < end; ++i)\n        { result.push(new Line(text[i], spansFor(i), estimateHeight)); }\n      return result\n    }\n\n    var from = change.from, to = change.to, text = change.text;\n    var firstLine = getLine(doc, from.line), lastLine = getLine(doc, to.line);\n    var lastText = lst(text), lastSpans = spansFor(text.length - 1), nlines = to.line - from.line;\n\n    // Adjust the line structure\n    if (change.full) {\n      doc.insert(0, linesFor(0, text.length));\n      doc.remove(text.length, doc.size - text.length);\n    } else if (isWholeLineUpdate(doc, change)) {\n      // This is a whole-line replace. Treated specially to make\n      // sure line objects move the way they are supposed to.\n      var added = linesFor(0, text.length - 1);\n      update(lastLine, lastLine.text, lastSpans);\n      if (nlines) { doc.remove(from.line, nlines); }\n      if (added.length) { doc.insert(from.line, added); }\n    } else if (firstLine == lastLine) {\n      if (text.length == 1) {\n        update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans);\n      } else {\n        var added$1 = linesFor(1, text.length - 1);\n        added$1.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight));\n        update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));\n        doc.insert(from.line + 1, added$1);\n      }\n    } else if (text.length == 1) {\n      update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0));\n      doc.remove(from.line + 1, nlines);\n    } else {\n      update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));\n      update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans);\n      var added$2 = linesFor(1, text.length - 1);\n      if (nlines > 1) { doc.remove(from.line + 1, nlines - 1); }\n      doc.insert(from.line + 1, added$2);\n    }\n\n    signalLater(doc, \"change\", doc, change);\n  }\n\n  // Call f for all linked documents.\n  function linkedDocs(doc, f, sharedHistOnly) {\n    function propagate(doc, skip, sharedHist) {\n      if (doc.linked) { for (var i = 0; i < doc.linked.length; ++i) {\n        var rel = doc.linked[i];\n        if (rel.doc == skip) { continue }\n        var shared = sharedHist && rel.sharedHist;\n        if (sharedHistOnly && !shared) { continue }\n        f(rel.doc, shared);\n        propagate(rel.doc, doc, shared);\n      } }\n    }\n    propagate(doc, null, true);\n  }\n\n  // Attach a document to an editor.\n  function attachDoc(cm, doc) {\n    if (doc.cm) { throw new Error(\"This document is already in use.\") }\n    cm.doc = doc;\n    doc.cm = cm;\n    estimateLineHeights(cm);\n    loadMode(cm);\n    setDirectionClass(cm);\n    if (!cm.options.lineWrapping) { findMaxLine(cm); }\n    cm.options.mode = doc.modeOption;\n    regChange(cm);\n  }\n\n  function setDirectionClass(cm) {\n  (cm.doc.direction == \"rtl\" ? addClass : rmClass)(cm.display.lineDiv, \"CodeMirror-rtl\");\n  }\n\n  function directionChanged(cm) {\n    runInOp(cm, function () {\n      setDirectionClass(cm);\n      regChange(cm);\n    });\n  }\n\n  function History(startGen) {\n    // Arrays of change events and selections. Doing something adds an\n    // event to done and clears undo. Undoing moves events from done\n    // to undone, redoing moves them in the other direction.\n    this.done = []; this.undone = [];\n    this.undoDepth = Infinity;\n    // Used to track when changes can be merged into a single undo\n    // event\n    this.lastModTime = this.lastSelTime = 0;\n    this.lastOp = this.lastSelOp = null;\n    this.lastOrigin = this.lastSelOrigin = null;\n    // Used by the isClean() method\n    this.generation = this.maxGeneration = startGen || 1;\n  }\n\n  // Create a history change event from an updateDoc-style change\n  // object.\n  function historyChangeFromChange(doc, change) {\n    var histChange = {from: copyPos(change.from), to: changeEnd(change), text: getBetween(doc, change.from, change.to)};\n    attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);\n    linkedDocs(doc, function (doc) { return attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1); }, true);\n    return histChange\n  }\n\n  // Pop all selection events off the end of a history array. Stop at\n  // a change event.\n  function clearSelectionEvents(array) {\n    while (array.length) {\n      var last = lst(array);\n      if (last.ranges) { array.pop(); }\n      else { break }\n    }\n  }\n\n  // Find the top change event in the history. Pop off selection\n  // events that are in the way.\n  function lastChangeEvent(hist, force) {\n    if (force) {\n      clearSelectionEvents(hist.done);\n      return lst(hist.done)\n    } else if (hist.done.length && !lst(hist.done).ranges) {\n      return lst(hist.done)\n    } else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {\n      hist.done.pop();\n      return lst(hist.done)\n    }\n  }\n\n  // Register a change in the history. Merges changes that are within\n  // a single operation, or are close together with an origin that\n  // allows merging (starting with \"+\") into a single event.\n  function addChangeToHistory(doc, change, selAfter, opId) {\n    var hist = doc.history;\n    hist.undone.length = 0;\n    var time = +new Date, cur;\n    var last;\n\n    if ((hist.lastOp == opId ||\n         hist.lastOrigin == change.origin && change.origin &&\n         ((change.origin.charAt(0) == \"+\" && hist.lastModTime > time - (doc.cm ? doc.cm.options.historyEventDelay : 500)) ||\n          change.origin.charAt(0) == \"*\")) &&\n        (cur = lastChangeEvent(hist, hist.lastOp == opId))) {\n      // Merge this change into the last event\n      last = lst(cur.changes);\n      if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {\n        // Optimized case for simple insertion -- don't want to add\n        // new changesets for every character typed\n        last.to = changeEnd(change);\n      } else {\n        // Add new sub-event\n        cur.changes.push(historyChangeFromChange(doc, change));\n      }\n    } else {\n      // Can not be merged, start a new event.\n      var before = lst(hist.done);\n      if (!before || !before.ranges)\n        { pushSelectionToHistory(doc.sel, hist.done); }\n      cur = {changes: [historyChangeFromChange(doc, change)],\n             generation: hist.generation};\n      hist.done.push(cur);\n      while (hist.done.length > hist.undoDepth) {\n        hist.done.shift();\n        if (!hist.done[0].ranges) { hist.done.shift(); }\n      }\n    }\n    hist.done.push(selAfter);\n    hist.generation = ++hist.maxGeneration;\n    hist.lastModTime = hist.lastSelTime = time;\n    hist.lastOp = hist.lastSelOp = opId;\n    hist.lastOrigin = hist.lastSelOrigin = change.origin;\n\n    if (!last) { signal(doc, \"historyAdded\"); }\n  }\n\n  function selectionEventCanBeMerged(doc, origin, prev, sel) {\n    var ch = origin.charAt(0);\n    return ch == \"*\" ||\n      ch == \"+\" &&\n      prev.ranges.length == sel.ranges.length &&\n      prev.somethingSelected() == sel.somethingSelected() &&\n      new Date - doc.history.lastSelTime <= (doc.cm ? doc.cm.options.historyEventDelay : 500)\n  }\n\n  // Called whenever the selection changes, sets the new selection as\n  // the pending selection in the history, and pushes the old pending\n  // selection into the 'done' array when it was significantly\n  // different (in number of selected ranges, emptiness, or time).\n  function addSelectionToHistory(doc, sel, opId, options) {\n    var hist = doc.history, origin = options && options.origin;\n\n    // A new event is started when the previous origin does not match\n    // the current, or the origins don't allow matching. Origins\n    // starting with * are always merged, those starting with + are\n    // merged when similar and close together in time.\n    if (opId == hist.lastSelOp ||\n        (origin && hist.lastSelOrigin == origin &&\n         (hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin ||\n          selectionEventCanBeMerged(doc, origin, lst(hist.done), sel))))\n      { hist.done[hist.done.length - 1] = sel; }\n    else\n      { pushSelectionToHistory(sel, hist.done); }\n\n    hist.lastSelTime = +new Date;\n    hist.lastSelOrigin = origin;\n    hist.lastSelOp = opId;\n    if (options && options.clearRedo !== false)\n      { clearSelectionEvents(hist.undone); }\n  }\n\n  function pushSelectionToHistory(sel, dest) {\n    var top = lst(dest);\n    if (!(top && top.ranges && top.equals(sel)))\n      { dest.push(sel); }\n  }\n\n  // Used to store marked span information in the history.\n  function attachLocalSpans(doc, change, from, to) {\n    var existing = change[\"spans_\" + doc.id], n = 0;\n    doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function (line) {\n      if (line.markedSpans)\n        { (existing || (existing = change[\"spans_\" + doc.id] = {}))[n] = line.markedSpans; }\n      ++n;\n    });\n  }\n\n  // When un/re-doing restores text containing marked spans, those\n  // that have been explicitly cleared should not be restored.\n  function removeClearedSpans(spans) {\n    if (!spans) { return null }\n    var out;\n    for (var i = 0; i < spans.length; ++i) {\n      if (spans[i].marker.explicitlyCleared) { if (!out) { out = spans.slice(0, i); } }\n      else if (out) { out.push(spans[i]); }\n    }\n    return !out ? spans : out.length ? out : null\n  }\n\n  // Retrieve and filter the old marked spans stored in a change event.\n  function getOldSpans(doc, change) {\n    var found = change[\"spans_\" + doc.id];\n    if (!found) { return null }\n    var nw = [];\n    for (var i = 0; i < change.text.length; ++i)\n      { nw.push(removeClearedSpans(found[i])); }\n    return nw\n  }\n\n  // Used for un/re-doing changes from the history. Combines the\n  // result of computing the existing spans with the set of spans that\n  // existed in the history (so that deleting around a span and then\n  // undoing brings back the span).\n  function mergeOldSpans(doc, change) {\n    var old = getOldSpans(doc, change);\n    var stretched = stretchSpansOverChange(doc, change);\n    if (!old) { return stretched }\n    if (!stretched) { return old }\n\n    for (var i = 0; i < old.length; ++i) {\n      var oldCur = old[i], stretchCur = stretched[i];\n      if (oldCur && stretchCur) {\n        spans: for (var j = 0; j < stretchCur.length; ++j) {\n          var span = stretchCur[j];\n          for (var k = 0; k < oldCur.length; ++k)\n            { if (oldCur[k].marker == span.marker) { continue spans } }\n          oldCur.push(span);\n        }\n      } else if (stretchCur) {\n        old[i] = stretchCur;\n      }\n    }\n    return old\n  }\n\n  // Used both to provide a JSON-safe object in .getHistory, and, when\n  // detaching a document, to split the history in two\n  function copyHistoryArray(events, newGroup, instantiateSel) {\n    var copy = [];\n    for (var i = 0; i < events.length; ++i) {\n      var event = events[i];\n      if (event.ranges) {\n        copy.push(instantiateSel ? Selection.prototype.deepCopy.call(event) : event);\n        continue\n      }\n      var changes = event.changes, newChanges = [];\n      copy.push({changes: newChanges});\n      for (var j = 0; j < changes.length; ++j) {\n        var change = changes[j], m = (void 0);\n        newChanges.push({from: change.from, to: change.to, text: change.text});\n        if (newGroup) { for (var prop in change) { if (m = prop.match(/^spans_(\\d+)$/)) {\n          if (indexOf(newGroup, Number(m[1])) > -1) {\n            lst(newChanges)[prop] = change[prop];\n            delete change[prop];\n          }\n        } } }\n      }\n    }\n    return copy\n  }\n\n  // The 'scroll' parameter given to many of these indicated whether\n  // the new cursor position should be scrolled into view after\n  // modifying the selection.\n\n  // If shift is held or the extend flag is set, extends a range to\n  // include a given position (and optionally a second position).\n  // Otherwise, simply returns the range between the given positions.\n  // Used for cursor motion and such.\n  function extendRange(range, head, other, extend) {\n    if (extend) {\n      var anchor = range.anchor;\n      if (other) {\n        var posBefore = cmp(head, anchor) < 0;\n        if (posBefore != (cmp(other, anchor) < 0)) {\n          anchor = head;\n          head = other;\n        } else if (posBefore != (cmp(head, other) < 0)) {\n          head = other;\n        }\n      }\n      return new Range(anchor, head)\n    } else {\n      return new Range(other || head, head)\n    }\n  }\n\n  // Extend the primary selection range, discard the rest.\n  function extendSelection(doc, head, other, options, extend) {\n    if (extend == null) { extend = doc.cm && (doc.cm.display.shift || doc.extend); }\n    setSelection(doc, new Selection([extendRange(doc.sel.primary(), head, other, extend)], 0), options);\n  }\n\n  // Extend all selections (pos is an array of selections with length\n  // equal the number of selections)\n  function extendSelections(doc, heads, options) {\n    var out = [];\n    var extend = doc.cm && (doc.cm.display.shift || doc.extend);\n    for (var i = 0; i < doc.sel.ranges.length; i++)\n      { out[i] = extendRange(doc.sel.ranges[i], heads[i], null, extend); }\n    var newSel = normalizeSelection(doc.cm, out, doc.sel.primIndex);\n    setSelection(doc, newSel, options);\n  }\n\n  // Updates a single range in the selection.\n  function replaceOneSelection(doc, i, range, options) {\n    var ranges = doc.sel.ranges.slice(0);\n    ranges[i] = range;\n    setSelection(doc, normalizeSelection(doc.cm, ranges, doc.sel.primIndex), options);\n  }\n\n  // Reset the selection to a single range.\n  function setSimpleSelection(doc, anchor, head, options) {\n    setSelection(doc, simpleSelection(anchor, head), options);\n  }\n\n  // Give beforeSelectionChange handlers a change to influence a\n  // selection update.\n  function filterSelectionChange(doc, sel, options) {\n    var obj = {\n      ranges: sel.ranges,\n      update: function(ranges) {\n        this.ranges = [];\n        for (var i = 0; i < ranges.length; i++)\n          { this.ranges[i] = new Range(clipPos(doc, ranges[i].anchor),\n                                     clipPos(doc, ranges[i].head)); }\n      },\n      origin: options && options.origin\n    };\n    signal(doc, \"beforeSelectionChange\", doc, obj);\n    if (doc.cm) { signal(doc.cm, \"beforeSelectionChange\", doc.cm, obj); }\n    if (obj.ranges != sel.ranges) { return normalizeSelection(doc.cm, obj.ranges, obj.ranges.length - 1) }\n    else { return sel }\n  }\n\n  function setSelectionReplaceHistory(doc, sel, options) {\n    var done = doc.history.done, last = lst(done);\n    if (last && last.ranges) {\n      done[done.length - 1] = sel;\n      setSelectionNoUndo(doc, sel, options);\n    } else {\n      setSelection(doc, sel, options);\n    }\n  }\n\n  // Set a new selection.\n  function setSelection(doc, sel, options) {\n    setSelectionNoUndo(doc, sel, options);\n    addSelectionToHistory(doc, doc.sel, doc.cm ? doc.cm.curOp.id : NaN, options);\n  }\n\n  function setSelectionNoUndo(doc, sel, options) {\n    if (hasHandler(doc, \"beforeSelectionChange\") || doc.cm && hasHandler(doc.cm, \"beforeSelectionChange\"))\n      { sel = filterSelectionChange(doc, sel, options); }\n\n    var bias = options && options.bias ||\n      (cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1);\n    setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true));\n\n    if (!(options && options.scroll === false) && doc.cm)\n      { ensureCursorVisible(doc.cm); }\n  }\n\n  function setSelectionInner(doc, sel) {\n    if (sel.equals(doc.sel)) { return }\n\n    doc.sel = sel;\n\n    if (doc.cm) {\n      doc.cm.curOp.updateInput = 1;\n      doc.cm.curOp.selectionChanged = true;\n      signalCursorActivity(doc.cm);\n    }\n    signalLater(doc, \"cursorActivity\", doc);\n  }\n\n  // Verify that the selection does not partially select any atomic\n  // marked ranges.\n  function reCheckSelection(doc) {\n    setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false));\n  }\n\n  // Return a selection that does not partially select any atomic\n  // ranges.\n  function skipAtomicInSelection(doc, sel, bias, mayClear) {\n    var out;\n    for (var i = 0; i < sel.ranges.length; i++) {\n      var range = sel.ranges[i];\n      var old = sel.ranges.length == doc.sel.ranges.length && doc.sel.ranges[i];\n      var newAnchor = skipAtomic(doc, range.anchor, old && old.anchor, bias, mayClear);\n      var newHead = skipAtomic(doc, range.head, old && old.head, bias, mayClear);\n      if (out || newAnchor != range.anchor || newHead != range.head) {\n        if (!out) { out = sel.ranges.slice(0, i); }\n        out[i] = new Range(newAnchor, newHead);\n      }\n    }\n    return out ? normalizeSelection(doc.cm, out, sel.primIndex) : sel\n  }\n\n  function skipAtomicInner(doc, pos, oldPos, dir, mayClear) {\n    var line = getLine(doc, pos.line);\n    if (line.markedSpans) { for (var i = 0; i < line.markedSpans.length; ++i) {\n      var sp = line.markedSpans[i], m = sp.marker;\n\n      // Determine if we should prevent the cursor being placed to the left/right of an atomic marker\n      // Historically this was determined using the inclusiveLeft/Right option, but the new way to control it\n      // is with selectLeft/Right\n      var preventCursorLeft = (\"selectLeft\" in m) ? !m.selectLeft : m.inclusiveLeft;\n      var preventCursorRight = (\"selectRight\" in m) ? !m.selectRight : m.inclusiveRight;\n\n      if ((sp.from == null || (preventCursorLeft ? sp.from <= pos.ch : sp.from < pos.ch)) &&\n          (sp.to == null || (preventCursorRight ? sp.to >= pos.ch : sp.to > pos.ch))) {\n        if (mayClear) {\n          signal(m, \"beforeCursorEnter\");\n          if (m.explicitlyCleared) {\n            if (!line.markedSpans) { break }\n            else {--i; continue}\n          }\n        }\n        if (!m.atomic) { continue }\n\n        if (oldPos) {\n          var near = m.find(dir < 0 ? 1 : -1), diff = (void 0);\n          if (dir < 0 ? preventCursorRight : preventCursorLeft)\n            { near = movePos(doc, near, -dir, near && near.line == pos.line ? line : null); }\n          if (near && near.line == pos.line && (diff = cmp(near, oldPos)) && (dir < 0 ? diff < 0 : diff > 0))\n            { return skipAtomicInner(doc, near, pos, dir, mayClear) }\n        }\n\n        var far = m.find(dir < 0 ? -1 : 1);\n        if (dir < 0 ? preventCursorLeft : preventCursorRight)\n          { far = movePos(doc, far, dir, far.line == pos.line ? line : null); }\n        return far ? skipAtomicInner(doc, far, pos, dir, mayClear) : null\n      }\n    } }\n    return pos\n  }\n\n  // Ensure a given position is not inside an atomic range.\n  function skipAtomic(doc, pos, oldPos, bias, mayClear) {\n    var dir = bias || 1;\n    var found = skipAtomicInner(doc, pos, oldPos, dir, mayClear) ||\n        (!mayClear && skipAtomicInner(doc, pos, oldPos, dir, true)) ||\n        skipAtomicInner(doc, pos, oldPos, -dir, mayClear) ||\n        (!mayClear && skipAtomicInner(doc, pos, oldPos, -dir, true));\n    if (!found) {\n      doc.cantEdit = true;\n      return Pos(doc.first, 0)\n    }\n    return found\n  }\n\n  function movePos(doc, pos, dir, line) {\n    if (dir < 0 && pos.ch == 0) {\n      if (pos.line > doc.first) { return clipPos(doc, Pos(pos.line - 1)) }\n      else { return null }\n    } else if (dir > 0 && pos.ch == (line || getLine(doc, pos.line)).text.length) {\n      if (pos.line < doc.first + doc.size - 1) { return Pos(pos.line + 1, 0) }\n      else { return null }\n    } else {\n      return new Pos(pos.line, pos.ch + dir)\n    }\n  }\n\n  function selectAll(cm) {\n    cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll);\n  }\n\n  // UPDATING\n\n  // Allow \"beforeChange\" event handlers to influence a change\n  function filterChange(doc, change, update) {\n    var obj = {\n      canceled: false,\n      from: change.from,\n      to: change.to,\n      text: change.text,\n      origin: change.origin,\n      cancel: function () { return obj.canceled = true; }\n    };\n    if (update) { obj.update = function (from, to, text, origin) {\n      if (from) { obj.from = clipPos(doc, from); }\n      if (to) { obj.to = clipPos(doc, to); }\n      if (text) { obj.text = text; }\n      if (origin !== undefined) { obj.origin = origin; }\n    }; }\n    signal(doc, \"beforeChange\", doc, obj);\n    if (doc.cm) { signal(doc.cm, \"beforeChange\", doc.cm, obj); }\n\n    if (obj.canceled) {\n      if (doc.cm) { doc.cm.curOp.updateInput = 2; }\n      return null\n    }\n    return {from: obj.from, to: obj.to, text: obj.text, origin: obj.origin}\n  }\n\n  // Apply a change to a document, and add it to the document's\n  // history, and propagating it to all linked documents.\n  function makeChange(doc, change, ignoreReadOnly) {\n    if (doc.cm) {\n      if (!doc.cm.curOp) { return operation(doc.cm, makeChange)(doc, change, ignoreReadOnly) }\n      if (doc.cm.state.suppressEdits) { return }\n    }\n\n    if (hasHandler(doc, \"beforeChange\") || doc.cm && hasHandler(doc.cm, \"beforeChange\")) {\n      change = filterChange(doc, change, true);\n      if (!change) { return }\n    }\n\n    // Possibly split or suppress the update based on the presence\n    // of read-only spans in its range.\n    var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to);\n    if (split) {\n      for (var i = split.length - 1; i >= 0; --i)\n        { makeChangeInner(doc, {from: split[i].from, to: split[i].to, text: i ? [\"\"] : change.text, origin: change.origin}); }\n    } else {\n      makeChangeInner(doc, change);\n    }\n  }\n\n  function makeChangeInner(doc, change) {\n    if (change.text.length == 1 && change.text[0] == \"\" && cmp(change.from, change.to) == 0) { return }\n    var selAfter = computeSelAfterChange(doc, change);\n    addChangeToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN);\n\n    makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change));\n    var rebased = [];\n\n    linkedDocs(doc, function (doc, sharedHist) {\n      if (!sharedHist && indexOf(rebased, doc.history) == -1) {\n        rebaseHist(doc.history, change);\n        rebased.push(doc.history);\n      }\n      makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change));\n    });\n  }\n\n  // Revert a change stored in a document's history.\n  function makeChangeFromHistory(doc, type, allowSelectionOnly) {\n    var suppress = doc.cm && doc.cm.state.suppressEdits;\n    if (suppress && !allowSelectionOnly) { return }\n\n    var hist = doc.history, event, selAfter = doc.sel;\n    var source = type == \"undo\" ? hist.done : hist.undone, dest = type == \"undo\" ? hist.undone : hist.done;\n\n    // Verify that there is a useable event (so that ctrl-z won't\n    // needlessly clear selection events)\n    var i = 0;\n    for (; i < source.length; i++) {\n      event = source[i];\n      if (allowSelectionOnly ? event.ranges && !event.equals(doc.sel) : !event.ranges)\n        { break }\n    }\n    if (i == source.length) { return }\n    hist.lastOrigin = hist.lastSelOrigin = null;\n\n    for (;;) {\n      event = source.pop();\n      if (event.ranges) {\n        pushSelectionToHistory(event, dest);\n        if (allowSelectionOnly && !event.equals(doc.sel)) {\n          setSelection(doc, event, {clearRedo: false});\n          return\n        }\n        selAfter = event;\n      } else if (suppress) {\n        source.push(event);\n        return\n      } else { break }\n    }\n\n    // Build up a reverse change object to add to the opposite history\n    // stack (redo when undoing, and vice versa).\n    var antiChanges = [];\n    pushSelectionToHistory(selAfter, dest);\n    dest.push({changes: antiChanges, generation: hist.generation});\n    hist.generation = event.generation || ++hist.maxGeneration;\n\n    var filter = hasHandler(doc, \"beforeChange\") || doc.cm && hasHandler(doc.cm, \"beforeChange\");\n\n    var loop = function ( i ) {\n      var change = event.changes[i];\n      change.origin = type;\n      if (filter && !filterChange(doc, change, false)) {\n        source.length = 0;\n        return {}\n      }\n\n      antiChanges.push(historyChangeFromChange(doc, change));\n\n      var after = i ? computeSelAfterChange(doc, change) : lst(source);\n      makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));\n      if (!i && doc.cm) { doc.cm.scrollIntoView({from: change.from, to: changeEnd(change)}); }\n      var rebased = [];\n\n      // Propagate to the linked documents\n      linkedDocs(doc, function (doc, sharedHist) {\n        if (!sharedHist && indexOf(rebased, doc.history) == -1) {\n          rebaseHist(doc.history, change);\n          rebased.push(doc.history);\n        }\n        makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change));\n      });\n    };\n\n    for (var i$1 = event.changes.length - 1; i$1 >= 0; --i$1) {\n      var returned = loop( i$1 );\n\n      if ( returned ) return returned.v;\n    }\n  }\n\n  // Sub-views need their line numbers shifted when text is added\n  // above or below them in the parent document.\n  function shiftDoc(doc, distance) {\n    if (distance == 0) { return }\n    doc.first += distance;\n    doc.sel = new Selection(map(doc.sel.ranges, function (range) { return new Range(\n      Pos(range.anchor.line + distance, range.anchor.ch),\n      Pos(range.head.line + distance, range.head.ch)\n    ); }), doc.sel.primIndex);\n    if (doc.cm) {\n      regChange(doc.cm, doc.first, doc.first - distance, distance);\n      for (var d = doc.cm.display, l = d.viewFrom; l < d.viewTo; l++)\n        { regLineChange(doc.cm, l, \"gutter\"); }\n    }\n  }\n\n  // More lower-level change function, handling only a single document\n  // (not linked ones).\n  function makeChangeSingleDoc(doc, change, selAfter, spans) {\n    if (doc.cm && !doc.cm.curOp)\n      { return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans) }\n\n    if (change.to.line < doc.first) {\n      shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line));\n      return\n    }\n    if (change.from.line > doc.lastLine()) { return }\n\n    // Clip the change to the size of this doc\n    if (change.from.line < doc.first) {\n      var shift = change.text.length - 1 - (doc.first - change.from.line);\n      shiftDoc(doc, shift);\n      change = {from: Pos(doc.first, 0), to: Pos(change.to.line + shift, change.to.ch),\n                text: [lst(change.text)], origin: change.origin};\n    }\n    var last = doc.lastLine();\n    if (change.to.line > last) {\n      change = {from: change.from, to: Pos(last, getLine(doc, last).text.length),\n                text: [change.text[0]], origin: change.origin};\n    }\n\n    change.removed = getBetween(doc, change.from, change.to);\n\n    if (!selAfter) { selAfter = computeSelAfterChange(doc, change); }\n    if (doc.cm) { makeChangeSingleDocInEditor(doc.cm, change, spans); }\n    else { updateDoc(doc, change, spans); }\n    setSelectionNoUndo(doc, selAfter, sel_dontScroll);\n\n    if (doc.cantEdit && skipAtomic(doc, Pos(doc.firstLine(), 0)))\n      { doc.cantEdit = false; }\n  }\n\n  // Handle the interaction of a change to a document with the editor\n  // that this document is part of.\n  function makeChangeSingleDocInEditor(cm, change, spans) {\n    var doc = cm.doc, display = cm.display, from = change.from, to = change.to;\n\n    var recomputeMaxLength = false, checkWidthStart = from.line;\n    if (!cm.options.lineWrapping) {\n      checkWidthStart = lineNo(visualLine(getLine(doc, from.line)));\n      doc.iter(checkWidthStart, to.line + 1, function (line) {\n        if (line == display.maxLine) {\n          recomputeMaxLength = true;\n          return true\n        }\n      });\n    }\n\n    if (doc.sel.contains(change.from, change.to) > -1)\n      { signalCursorActivity(cm); }\n\n    updateDoc(doc, change, spans, estimateHeight(cm));\n\n    if (!cm.options.lineWrapping) {\n      doc.iter(checkWidthStart, from.line + change.text.length, function (line) {\n        var len = lineLength(line);\n        if (len > display.maxLineLength) {\n          display.maxLine = line;\n          display.maxLineLength = len;\n          display.maxLineChanged = true;\n          recomputeMaxLength = false;\n        }\n      });\n      if (recomputeMaxLength) { cm.curOp.updateMaxLine = true; }\n    }\n\n    retreatFrontier(doc, from.line);\n    startWorker(cm, 400);\n\n    var lendiff = change.text.length - (to.line - from.line) - 1;\n    // Remember that these lines changed, for updating the display\n    if (change.full)\n      { regChange(cm); }\n    else if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change))\n      { regLineChange(cm, from.line, \"text\"); }\n    else\n      { regChange(cm, from.line, to.line + 1, lendiff); }\n\n    var changesHandler = hasHandler(cm, \"changes\"), changeHandler = hasHandler(cm, \"change\");\n    if (changeHandler || changesHandler) {\n      var obj = {\n        from: from, to: to,\n        text: change.text,\n        removed: change.removed,\n        origin: change.origin\n      };\n      if (changeHandler) { signalLater(cm, \"change\", cm, obj); }\n      if (changesHandler) { (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push(obj); }\n    }\n    cm.display.selForContextMenu = null;\n  }\n\n  function replaceRange(doc, code, from, to, origin) {\n    var assign;\n\n    if (!to) { to = from; }\n    if (cmp(to, from) < 0) { (assign = [to, from], from = assign[0], to = assign[1]); }\n    if (typeof code == \"string\") { code = doc.splitLines(code); }\n    makeChange(doc, {from: from, to: to, text: code, origin: origin});\n  }\n\n  // Rebasing/resetting history to deal with externally-sourced changes\n\n  function rebaseHistSelSingle(pos, from, to, diff) {\n    if (to < pos.line) {\n      pos.line += diff;\n    } else if (from < pos.line) {\n      pos.line = from;\n      pos.ch = 0;\n    }\n  }\n\n  // Tries to rebase an array of history events given a change in the\n  // document. If the change touches the same lines as the event, the\n  // event, and everything 'behind' it, is discarded. If the change is\n  // before the event, the event's positions are updated. Uses a\n  // copy-on-write scheme for the positions, to avoid having to\n  // reallocate them all on every rebase, but also avoid problems with\n  // shared position objects being unsafely updated.\n  function rebaseHistArray(array, from, to, diff) {\n    for (var i = 0; i < array.length; ++i) {\n      var sub = array[i], ok = true;\n      if (sub.ranges) {\n        if (!sub.copied) { sub = array[i] = sub.deepCopy(); sub.copied = true; }\n        for (var j = 0; j < sub.ranges.length; j++) {\n          rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff);\n          rebaseHistSelSingle(sub.ranges[j].head, from, to, diff);\n        }\n        continue\n      }\n      for (var j$1 = 0; j$1 < sub.changes.length; ++j$1) {\n        var cur = sub.changes[j$1];\n        if (to < cur.from.line) {\n          cur.from = Pos(cur.from.line + diff, cur.from.ch);\n          cur.to = Pos(cur.to.line + diff, cur.to.ch);\n        } else if (from <= cur.to.line) {\n          ok = false;\n          break\n        }\n      }\n      if (!ok) {\n        array.splice(0, i + 1);\n        i = 0;\n      }\n    }\n  }\n\n  function rebaseHist(hist, change) {\n    var from = change.from.line, to = change.to.line, diff = change.text.length - (to - from) - 1;\n    rebaseHistArray(hist.done, from, to, diff);\n    rebaseHistArray(hist.undone, from, to, diff);\n  }\n\n  // Utility for applying a change to a line by handle or number,\n  // returning the number and optionally registering the line as\n  // changed.\n  function changeLine(doc, handle, changeType, op) {\n    var no = handle, line = handle;\n    if (typeof handle == \"number\") { line = getLine(doc, clipLine(doc, handle)); }\n    else { no = lineNo(handle); }\n    if (no == null) { return null }\n    if (op(line, no) && doc.cm) { regLineChange(doc.cm, no, changeType); }\n    return line\n  }\n\n  // The document is represented as a BTree consisting of leaves, with\n  // chunk of lines in them, and branches, with up to ten leaves or\n  // other branch nodes below them. The top node is always a branch\n  // node, and is the document object itself (meaning it has\n  // additional methods and properties).\n  //\n  // All nodes have parent links. The tree is used both to go from\n  // line numbers to line objects, and to go from objects to numbers.\n  // It also indexes by height, and is used to convert between height\n  // and line object, and to find the total height of the document.\n  //\n  // See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html\n\n  function LeafChunk(lines) {\n    this.lines = lines;\n    this.parent = null;\n    var height = 0;\n    for (var i = 0; i < lines.length; ++i) {\n      lines[i].parent = this;\n      height += lines[i].height;\n    }\n    this.height = height;\n  }\n\n  LeafChunk.prototype = {\n    chunkSize: function() { return this.lines.length },\n\n    // Remove the n lines at offset 'at'.\n    removeInner: function(at, n) {\n      for (var i = at, e = at + n; i < e; ++i) {\n        var line = this.lines[i];\n        this.height -= line.height;\n        cleanUpLine(line);\n        signalLater(line, \"delete\");\n      }\n      this.lines.splice(at, n);\n    },\n\n    // Helper used to collapse a small branch into a single leaf.\n    collapse: function(lines) {\n      lines.push.apply(lines, this.lines);\n    },\n\n    // Insert the given array of lines at offset 'at', count them as\n    // having the given height.\n    insertInner: function(at, lines, height) {\n      this.height += height;\n      this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));\n      for (var i = 0; i < lines.length; ++i) { lines[i].parent = this; }\n    },\n\n    // Used to iterate over a part of the tree.\n    iterN: function(at, n, op) {\n      for (var e = at + n; at < e; ++at)\n        { if (op(this.lines[at])) { return true } }\n    }\n  };\n\n  function BranchChunk(children) {\n    this.children = children;\n    var size = 0, height = 0;\n    for (var i = 0; i < children.length; ++i) {\n      var ch = children[i];\n      size += ch.chunkSize(); height += ch.height;\n      ch.parent = this;\n    }\n    this.size = size;\n    this.height = height;\n    this.parent = null;\n  }\n\n  BranchChunk.prototype = {\n    chunkSize: function() { return this.size },\n\n    removeInner: function(at, n) {\n      this.size -= n;\n      for (var i = 0; i < this.children.length; ++i) {\n        var child = this.children[i], sz = child.chunkSize();\n        if (at < sz) {\n          var rm = Math.min(n, sz - at), oldHeight = child.height;\n          child.removeInner(at, rm);\n          this.height -= oldHeight - child.height;\n          if (sz == rm) { this.children.splice(i--, 1); child.parent = null; }\n          if ((n -= rm) == 0) { break }\n          at = 0;\n        } else { at -= sz; }\n      }\n      // If the result is smaller than 25 lines, ensure that it is a\n      // single leaf node.\n      if (this.size - n < 25 &&\n          (this.children.length > 1 || !(this.children[0] instanceof LeafChunk))) {\n        var lines = [];\n        this.collapse(lines);\n        this.children = [new LeafChunk(lines)];\n        this.children[0].parent = this;\n      }\n    },\n\n    collapse: function(lines) {\n      for (var i = 0; i < this.children.length; ++i) { this.children[i].collapse(lines); }\n    },\n\n    insertInner: function(at, lines, height) {\n      this.size += lines.length;\n      this.height += height;\n      for (var i = 0; i < this.children.length; ++i) {\n        var child = this.children[i], sz = child.chunkSize();\n        if (at <= sz) {\n          child.insertInner(at, lines, height);\n          if (child.lines && child.lines.length > 50) {\n            // To avoid memory thrashing when child.lines is huge (e.g. first view of a large file), it's never spliced.\n            // Instead, small slices are taken. They're taken in order because sequential memory accesses are fastest.\n            var remaining = child.lines.length % 25 + 25;\n            for (var pos = remaining; pos < child.lines.length;) {\n              var leaf = new LeafChunk(child.lines.slice(pos, pos += 25));\n              child.height -= leaf.height;\n              this.children.splice(++i, 0, leaf);\n              leaf.parent = this;\n            }\n            child.lines = child.lines.slice(0, remaining);\n            this.maybeSpill();\n          }\n          break\n        }\n        at -= sz;\n      }\n    },\n\n    // When a node has grown, check whether it should be split.\n    maybeSpill: function() {\n      if (this.children.length <= 10) { return }\n      var me = this;\n      do {\n        var spilled = me.children.splice(me.children.length - 5, 5);\n        var sibling = new BranchChunk(spilled);\n        if (!me.parent) { // Become the parent node\n          var copy = new BranchChunk(me.children);\n          copy.parent = me;\n          me.children = [copy, sibling];\n          me = copy;\n       } else {\n          me.size -= sibling.size;\n          me.height -= sibling.height;\n          var myIndex = indexOf(me.parent.children, me);\n          me.parent.children.splice(myIndex + 1, 0, sibling);\n        }\n        sibling.parent = me.parent;\n      } while (me.children.length > 10)\n      me.parent.maybeSpill();\n    },\n\n    iterN: function(at, n, op) {\n      for (var i = 0; i < this.children.length; ++i) {\n        var child = this.children[i], sz = child.chunkSize();\n        if (at < sz) {\n          var used = Math.min(n, sz - at);\n          if (child.iterN(at, used, op)) { return true }\n          if ((n -= used) == 0) { break }\n          at = 0;\n        } else { at -= sz; }\n      }\n    }\n  };\n\n  // Line widgets are block elements displayed above or below a line.\n\n  var LineWidget = function(doc, node, options) {\n    if (options) { for (var opt in options) { if (options.hasOwnProperty(opt))\n      { this[opt] = options[opt]; } } }\n    this.doc = doc;\n    this.node = node;\n  };\n\n  LineWidget.prototype.clear = function () {\n    var cm = this.doc.cm, ws = this.line.widgets, line = this.line, no = lineNo(line);\n    if (no == null || !ws) { return }\n    for (var i = 0; i < ws.length; ++i) { if (ws[i] == this) { ws.splice(i--, 1); } }\n    if (!ws.length) { line.widgets = null; }\n    var height = widgetHeight(this);\n    updateLineHeight(line, Math.max(0, line.height - height));\n    if (cm) {\n      runInOp(cm, function () {\n        adjustScrollWhenAboveVisible(cm, line, -height);\n        regLineChange(cm, no, \"widget\");\n      });\n      signalLater(cm, \"lineWidgetCleared\", cm, this, no);\n    }\n  };\n\n  LineWidget.prototype.changed = function () {\n      var this$1 = this;\n\n    var oldH = this.height, cm = this.doc.cm, line = this.line;\n    this.height = null;\n    var diff = widgetHeight(this) - oldH;\n    if (!diff) { return }\n    if (!lineIsHidden(this.doc, line)) { updateLineHeight(line, line.height + diff); }\n    if (cm) {\n      runInOp(cm, function () {\n        cm.curOp.forceUpdate = true;\n        adjustScrollWhenAboveVisible(cm, line, diff);\n        signalLater(cm, \"lineWidgetChanged\", cm, this$1, lineNo(line));\n      });\n    }\n  };\n  eventMixin(LineWidget);\n\n  function adjustScrollWhenAboveVisible(cm, line, diff) {\n    if (heightAtLine(line) < ((cm.curOp && cm.curOp.scrollTop) || cm.doc.scrollTop))\n      { addToScrollTop(cm, diff); }\n  }\n\n  function addLineWidget(doc, handle, node, options) {\n    var widget = new LineWidget(doc, node, options);\n    var cm = doc.cm;\n    if (cm && widget.noHScroll) { cm.display.alignWidgets = true; }\n    changeLine(doc, handle, \"widget\", function (line) {\n      var widgets = line.widgets || (line.widgets = []);\n      if (widget.insertAt == null) { widgets.push(widget); }\n      else { widgets.splice(Math.min(widgets.length - 1, Math.max(0, widget.insertAt)), 0, widget); }\n      widget.line = line;\n      if (cm && !lineIsHidden(doc, line)) {\n        var aboveVisible = heightAtLine(line) < doc.scrollTop;\n        updateLineHeight(line, line.height + widgetHeight(widget));\n        if (aboveVisible) { addToScrollTop(cm, widget.height); }\n        cm.curOp.forceUpdate = true;\n      }\n      return true\n    });\n    if (cm) { signalLater(cm, \"lineWidgetAdded\", cm, widget, typeof handle == \"number\" ? handle : lineNo(handle)); }\n    return widget\n  }\n\n  // TEXTMARKERS\n\n  // Created with markText and setBookmark methods. A TextMarker is a\n  // handle that can be used to clear or find a marked position in the\n  // document. Line objects hold arrays (markedSpans) containing\n  // {from, to, marker} object pointing to such marker objects, and\n  // indicating that such a marker is present on that line. Multiple\n  // lines may point to the same marker when it spans across lines.\n  // The spans will have null for their from/to properties when the\n  // marker continues beyond the start/end of the line. Markers have\n  // links back to the lines they currently touch.\n\n  // Collapsed markers have unique ids, in order to be able to order\n  // them, which is needed for uniquely determining an outer marker\n  // when they overlap (they may nest, but not partially overlap).\n  var nextMarkerId = 0;\n\n  var TextMarker = function(doc, type) {\n    this.lines = [];\n    this.type = type;\n    this.doc = doc;\n    this.id = ++nextMarkerId;\n  };\n\n  // Clear the marker.\n  TextMarker.prototype.clear = function () {\n    if (this.explicitlyCleared) { return }\n    var cm = this.doc.cm, withOp = cm && !cm.curOp;\n    if (withOp) { startOperation(cm); }\n    if (hasHandler(this, \"clear\")) {\n      var found = this.find();\n      if (found) { signalLater(this, \"clear\", found.from, found.to); }\n    }\n    var min = null, max = null;\n    for (var i = 0; i < this.lines.length; ++i) {\n      var line = this.lines[i];\n      var span = getMarkedSpanFor(line.markedSpans, this);\n      if (cm && !this.collapsed) { regLineChange(cm, lineNo(line), \"text\"); }\n      else if (cm) {\n        if (span.to != null) { max = lineNo(line); }\n        if (span.from != null) { min = lineNo(line); }\n      }\n      line.markedSpans = removeMarkedSpan(line.markedSpans, span);\n      if (span.from == null && this.collapsed && !lineIsHidden(this.doc, line) && cm)\n        { updateLineHeight(line, textHeight(cm.display)); }\n    }\n    if (cm && this.collapsed && !cm.options.lineWrapping) { for (var i$1 = 0; i$1 < this.lines.length; ++i$1) {\n      var visual = visualLine(this.lines[i$1]), len = lineLength(visual);\n      if (len > cm.display.maxLineLength) {\n        cm.display.maxLine = visual;\n        cm.display.maxLineLength = len;\n        cm.display.maxLineChanged = true;\n      }\n    } }\n\n    if (min != null && cm && this.collapsed) { regChange(cm, min, max + 1); }\n    this.lines.length = 0;\n    this.explicitlyCleared = true;\n    if (this.atomic && this.doc.cantEdit) {\n      this.doc.cantEdit = false;\n      if (cm) { reCheckSelection(cm.doc); }\n    }\n    if (cm) { signalLater(cm, \"markerCleared\", cm, this, min, max); }\n    if (withOp) { endOperation(cm); }\n    if (this.parent) { this.parent.clear(); }\n  };\n\n  // Find the position of the marker in the document. Returns a {from,\n  // to} object by default. Side can be passed to get a specific side\n  // -- 0 (both), -1 (left), or 1 (right). When lineObj is true, the\n  // Pos objects returned contain a line object, rather than a line\n  // number (used to prevent looking up the same line twice).\n  TextMarker.prototype.find = function (side, lineObj) {\n    if (side == null && this.type == \"bookmark\") { side = 1; }\n    var from, to;\n    for (var i = 0; i < this.lines.length; ++i) {\n      var line = this.lines[i];\n      var span = getMarkedSpanFor(line.markedSpans, this);\n      if (span.from != null) {\n        from = Pos(lineObj ? line : lineNo(line), span.from);\n        if (side == -1) { return from }\n      }\n      if (span.to != null) {\n        to = Pos(lineObj ? line : lineNo(line), span.to);\n        if (side == 1) { return to }\n      }\n    }\n    return from && {from: from, to: to}\n  };\n\n  // Signals that the marker's widget changed, and surrounding layout\n  // should be recomputed.\n  TextMarker.prototype.changed = function () {\n      var this$1 = this;\n\n    var pos = this.find(-1, true), widget = this, cm = this.doc.cm;\n    if (!pos || !cm) { return }\n    runInOp(cm, function () {\n      var line = pos.line, lineN = lineNo(pos.line);\n      var view = findViewForLine(cm, lineN);\n      if (view) {\n        clearLineMeasurementCacheFor(view);\n        cm.curOp.selectionChanged = cm.curOp.forceUpdate = true;\n      }\n      cm.curOp.updateMaxLine = true;\n      if (!lineIsHidden(widget.doc, line) && widget.height != null) {\n        var oldHeight = widget.height;\n        widget.height = null;\n        var dHeight = widgetHeight(widget) - oldHeight;\n        if (dHeight)\n          { updateLineHeight(line, line.height + dHeight); }\n      }\n      signalLater(cm, \"markerChanged\", cm, this$1);\n    });\n  };\n\n  TextMarker.prototype.attachLine = function (line) {\n    if (!this.lines.length && this.doc.cm) {\n      var op = this.doc.cm.curOp;\n      if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1)\n        { (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this); }\n    }\n    this.lines.push(line);\n  };\n\n  TextMarker.prototype.detachLine = function (line) {\n    this.lines.splice(indexOf(this.lines, line), 1);\n    if (!this.lines.length && this.doc.cm) {\n      var op = this.doc.cm.curOp\n      ;(op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this);\n    }\n  };\n  eventMixin(TextMarker);\n\n  // Create a marker, wire it up to the right lines, and\n  function markText(doc, from, to, options, type) {\n    // Shared markers (across linked documents) are handled separately\n    // (markTextShared will call out to this again, once per\n    // document).\n    if (options && options.shared) { return markTextShared(doc, from, to, options, type) }\n    // Ensure we are in an operation.\n    if (doc.cm && !doc.cm.curOp) { return operation(doc.cm, markText)(doc, from, to, options, type) }\n\n    var marker = new TextMarker(doc, type), diff = cmp(from, to);\n    if (options) { copyObj(options, marker, false); }\n    // Don't connect empty markers unless clearWhenEmpty is false\n    if (diff > 0 || diff == 0 && marker.clearWhenEmpty !== false)\n      { return marker }\n    if (marker.replacedWith) {\n      // Showing up as a widget implies collapsed (widget replaces text)\n      marker.collapsed = true;\n      marker.widgetNode = eltP(\"span\", [marker.replacedWith], \"CodeMirror-widget\");\n      if (!options.handleMouseEvents) { marker.widgetNode.setAttribute(\"cm-ignore-events\", \"true\"); }\n      if (options.insertLeft) { marker.widgetNode.insertLeft = true; }\n    }\n    if (marker.collapsed) {\n      if (conflictingCollapsedRange(doc, from.line, from, to, marker) ||\n          from.line != to.line && conflictingCollapsedRange(doc, to.line, from, to, marker))\n        { throw new Error(\"Inserting collapsed marker partially overlapping an existing one\") }\n      seeCollapsedSpans();\n    }\n\n    if (marker.addToHistory)\n      { addChangeToHistory(doc, {from: from, to: to, origin: \"markText\"}, doc.sel, NaN); }\n\n    var curLine = from.line, cm = doc.cm, updateMaxLine;\n    doc.iter(curLine, to.line + 1, function (line) {\n      if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(line) == cm.display.maxLine)\n        { updateMaxLine = true; }\n      if (marker.collapsed && curLine != from.line) { updateLineHeight(line, 0); }\n      addMarkedSpan(line, new MarkedSpan(marker,\n                                         curLine == from.line ? from.ch : null,\n                                         curLine == to.line ? to.ch : null));\n      ++curLine;\n    });\n    // lineIsHidden depends on the presence of the spans, so needs a second pass\n    if (marker.collapsed) { doc.iter(from.line, to.line + 1, function (line) {\n      if (lineIsHidden(doc, line)) { updateLineHeight(line, 0); }\n    }); }\n\n    if (marker.clearOnEnter) { on(marker, \"beforeCursorEnter\", function () { return marker.clear(); }); }\n\n    if (marker.readOnly) {\n      seeReadOnlySpans();\n      if (doc.history.done.length || doc.history.undone.length)\n        { doc.clearHistory(); }\n    }\n    if (marker.collapsed) {\n      marker.id = ++nextMarkerId;\n      marker.atomic = true;\n    }\n    if (cm) {\n      // Sync editor state\n      if (updateMaxLine) { cm.curOp.updateMaxLine = true; }\n      if (marker.collapsed)\n        { regChange(cm, from.line, to.line + 1); }\n      else if (marker.className || marker.startStyle || marker.endStyle || marker.css ||\n               marker.attributes || marker.title)\n        { for (var i = from.line; i <= to.line; i++) { regLineChange(cm, i, \"text\"); } }\n      if (marker.atomic) { reCheckSelection(cm.doc); }\n      signalLater(cm, \"markerAdded\", cm, marker);\n    }\n    return marker\n  }\n\n  // SHARED TEXTMARKERS\n\n  // A shared marker spans multiple linked documents. It is\n  // implemented as a meta-marker-object controlling multiple normal\n  // markers.\n  var SharedTextMarker = function(markers, primary) {\n    this.markers = markers;\n    this.primary = primary;\n    for (var i = 0; i < markers.length; ++i)\n      { markers[i].parent = this; }\n  };\n\n  SharedTextMarker.prototype.clear = function () {\n    if (this.explicitlyCleared) { return }\n    this.explicitlyCleared = true;\n    for (var i = 0; i < this.markers.length; ++i)\n      { this.markers[i].clear(); }\n    signalLater(this, \"clear\");\n  };\n\n  SharedTextMarker.prototype.find = function (side, lineObj) {\n    return this.primary.find(side, lineObj)\n  };\n  eventMixin(SharedTextMarker);\n\n  function markTextShared(doc, from, to, options, type) {\n    options = copyObj(options);\n    options.shared = false;\n    var markers = [markText(doc, from, to, options, type)], primary = markers[0];\n    var widget = options.widgetNode;\n    linkedDocs(doc, function (doc) {\n      if (widget) { options.widgetNode = widget.cloneNode(true); }\n      markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type));\n      for (var i = 0; i < doc.linked.length; ++i)\n        { if (doc.linked[i].isParent) { return } }\n      primary = lst(markers);\n    });\n    return new SharedTextMarker(markers, primary)\n  }\n\n  function findSharedMarkers(doc) {\n    return doc.findMarks(Pos(doc.first, 0), doc.clipPos(Pos(doc.lastLine())), function (m) { return m.parent; })\n  }\n\n  function copySharedMarkers(doc, markers) {\n    for (var i = 0; i < markers.length; i++) {\n      var marker = markers[i], pos = marker.find();\n      var mFrom = doc.clipPos(pos.from), mTo = doc.clipPos(pos.to);\n      if (cmp(mFrom, mTo)) {\n        var subMark = markText(doc, mFrom, mTo, marker.primary, marker.primary.type);\n        marker.markers.push(subMark);\n        subMark.parent = marker;\n      }\n    }\n  }\n\n  function detachSharedMarkers(markers) {\n    var loop = function ( i ) {\n      var marker = markers[i], linked = [marker.primary.doc];\n      linkedDocs(marker.primary.doc, function (d) { return linked.push(d); });\n      for (var j = 0; j < marker.markers.length; j++) {\n        var subMarker = marker.markers[j];\n        if (indexOf(linked, subMarker.doc) == -1) {\n          subMarker.parent = null;\n          marker.markers.splice(j--, 1);\n        }\n      }\n    };\n\n    for (var i = 0; i < markers.length; i++) loop( i );\n  }\n\n  var nextDocId = 0;\n  var Doc = function(text, mode, firstLine, lineSep, direction) {\n    if (!(this instanceof Doc)) { return new Doc(text, mode, firstLine, lineSep, direction) }\n    if (firstLine == null) { firstLine = 0; }\n\n    BranchChunk.call(this, [new LeafChunk([new Line(\"\", null)])]);\n    this.first = firstLine;\n    this.scrollTop = this.scrollLeft = 0;\n    this.cantEdit = false;\n    this.cleanGeneration = 1;\n    this.modeFrontier = this.highlightFrontier = firstLine;\n    var start = Pos(firstLine, 0);\n    this.sel = simpleSelection(start);\n    this.history = new History(null);\n    this.id = ++nextDocId;\n    this.modeOption = mode;\n    this.lineSep = lineSep;\n    this.direction = (direction == \"rtl\") ? \"rtl\" : \"ltr\";\n    this.extend = false;\n\n    if (typeof text == \"string\") { text = this.splitLines(text); }\n    updateDoc(this, {from: start, to: start, text: text});\n    setSelection(this, simpleSelection(start), sel_dontScroll);\n  };\n\n  Doc.prototype = createObj(BranchChunk.prototype, {\n    constructor: Doc,\n    // Iterate over the document. Supports two forms -- with only one\n    // argument, it calls that for each line in the document. With\n    // three, it iterates over the range given by the first two (with\n    // the second being non-inclusive).\n    iter: function(from, to, op) {\n      if (op) { this.iterN(from - this.first, to - from, op); }\n      else { this.iterN(this.first, this.first + this.size, from); }\n    },\n\n    // Non-public interface for adding and removing lines.\n    insert: function(at, lines) {\n      var height = 0;\n      for (var i = 0; i < lines.length; ++i) { height += lines[i].height; }\n      this.insertInner(at - this.first, lines, height);\n    },\n    remove: function(at, n) { this.removeInner(at - this.first, n); },\n\n    // From here, the methods are part of the public interface. Most\n    // are also available from CodeMirror (editor) instances.\n\n    getValue: function(lineSep) {\n      var lines = getLines(this, this.first, this.first + this.size);\n      if (lineSep === false) { return lines }\n      return lines.join(lineSep || this.lineSeparator())\n    },\n    setValue: docMethodOp(function(code) {\n      var top = Pos(this.first, 0), last = this.first + this.size - 1;\n      makeChange(this, {from: top, to: Pos(last, getLine(this, last).text.length),\n                        text: this.splitLines(code), origin: \"setValue\", full: true}, true);\n      if (this.cm) { scrollToCoords(this.cm, 0, 0); }\n      setSelection(this, simpleSelection(top), sel_dontScroll);\n    }),\n    replaceRange: function(code, from, to, origin) {\n      from = clipPos(this, from);\n      to = to ? clipPos(this, to) : from;\n      replaceRange(this, code, from, to, origin);\n    },\n    getRange: function(from, to, lineSep) {\n      var lines = getBetween(this, clipPos(this, from), clipPos(this, to));\n      if (lineSep === false) { return lines }\n      return lines.join(lineSep || this.lineSeparator())\n    },\n\n    getLine: function(line) {var l = this.getLineHandle(line); return l && l.text},\n\n    getLineHandle: function(line) {if (isLine(this, line)) { return getLine(this, line) }},\n    getLineNumber: function(line) {return lineNo(line)},\n\n    getLineHandleVisualStart: function(line) {\n      if (typeof line == \"number\") { line = getLine(this, line); }\n      return visualLine(line)\n    },\n\n    lineCount: function() {return this.size},\n    firstLine: function() {return this.first},\n    lastLine: function() {return this.first + this.size - 1},\n\n    clipPos: function(pos) {return clipPos(this, pos)},\n\n    getCursor: function(start) {\n      var range = this.sel.primary(), pos;\n      if (start == null || start == \"head\") { pos = range.head; }\n      else if (start == \"anchor\") { pos = range.anchor; }\n      else if (start == \"end\" || start == \"to\" || start === false) { pos = range.to(); }\n      else { pos = range.from(); }\n      return pos\n    },\n    listSelections: function() { return this.sel.ranges },\n    somethingSelected: function() {return this.sel.somethingSelected()},\n\n    setCursor: docMethodOp(function(line, ch, options) {\n      setSimpleSelection(this, clipPos(this, typeof line == \"number\" ? Pos(line, ch || 0) : line), null, options);\n    }),\n    setSelection: docMethodOp(function(anchor, head, options) {\n      setSimpleSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), options);\n    }),\n    extendSelection: docMethodOp(function(head, other, options) {\n      extendSelection(this, clipPos(this, head), other && clipPos(this, other), options);\n    }),\n    extendSelections: docMethodOp(function(heads, options) {\n      extendSelections(this, clipPosArray(this, heads), options);\n    }),\n    extendSelectionsBy: docMethodOp(function(f, options) {\n      var heads = map(this.sel.ranges, f);\n      extendSelections(this, clipPosArray(this, heads), options);\n    }),\n    setSelections: docMethodOp(function(ranges, primary, options) {\n      if (!ranges.length) { return }\n      var out = [];\n      for (var i = 0; i < ranges.length; i++)\n        { out[i] = new Range(clipPos(this, ranges[i].anchor),\n                           clipPos(this, ranges[i].head)); }\n      if (primary == null) { primary = Math.min(ranges.length - 1, this.sel.primIndex); }\n      setSelection(this, normalizeSelection(this.cm, out, primary), options);\n    }),\n    addSelection: docMethodOp(function(anchor, head, options) {\n      var ranges = this.sel.ranges.slice(0);\n      ranges.push(new Range(clipPos(this, anchor), clipPos(this, head || anchor)));\n      setSelection(this, normalizeSelection(this.cm, ranges, ranges.length - 1), options);\n    }),\n\n    getSelection: function(lineSep) {\n      var ranges = this.sel.ranges, lines;\n      for (var i = 0; i < ranges.length; i++) {\n        var sel = getBetween(this, ranges[i].from(), ranges[i].to());\n        lines = lines ? lines.concat(sel) : sel;\n      }\n      if (lineSep === false) { return lines }\n      else { return lines.join(lineSep || this.lineSeparator()) }\n    },\n    getSelections: function(lineSep) {\n      var parts = [], ranges = this.sel.ranges;\n      for (var i = 0; i < ranges.length; i++) {\n        var sel = getBetween(this, ranges[i].from(), ranges[i].to());\n        if (lineSep !== false) { sel = sel.join(lineSep || this.lineSeparator()); }\n        parts[i] = sel;\n      }\n      return parts\n    },\n    replaceSelection: function(code, collapse, origin) {\n      var dup = [];\n      for (var i = 0; i < this.sel.ranges.length; i++)\n        { dup[i] = code; }\n      this.replaceSelections(dup, collapse, origin || \"+input\");\n    },\n    replaceSelections: docMethodOp(function(code, collapse, origin) {\n      var changes = [], sel = this.sel;\n      for (var i = 0; i < sel.ranges.length; i++) {\n        var range = sel.ranges[i];\n        changes[i] = {from: range.from(), to: range.to(), text: this.splitLines(code[i]), origin: origin};\n      }\n      var newSel = collapse && collapse != \"end\" && computeReplacedSel(this, changes, collapse);\n      for (var i$1 = changes.length - 1; i$1 >= 0; i$1--)\n        { makeChange(this, changes[i$1]); }\n      if (newSel) { setSelectionReplaceHistory(this, newSel); }\n      else if (this.cm) { ensureCursorVisible(this.cm); }\n    }),\n    undo: docMethodOp(function() {makeChangeFromHistory(this, \"undo\");}),\n    redo: docMethodOp(function() {makeChangeFromHistory(this, \"redo\");}),\n    undoSelection: docMethodOp(function() {makeChangeFromHistory(this, \"undo\", true);}),\n    redoSelection: docMethodOp(function() {makeChangeFromHistory(this, \"redo\", true);}),\n\n    setExtending: function(val) {this.extend = val;},\n    getExtending: function() {return this.extend},\n\n    historySize: function() {\n      var hist = this.history, done = 0, undone = 0;\n      for (var i = 0; i < hist.done.length; i++) { if (!hist.done[i].ranges) { ++done; } }\n      for (var i$1 = 0; i$1 < hist.undone.length; i$1++) { if (!hist.undone[i$1].ranges) { ++undone; } }\n      return {undo: done, redo: undone}\n    },\n    clearHistory: function() {\n      var this$1 = this;\n\n      this.history = new History(this.history.maxGeneration);\n      linkedDocs(this, function (doc) { return doc.history = this$1.history; }, true);\n    },\n\n    markClean: function() {\n      this.cleanGeneration = this.changeGeneration(true);\n    },\n    changeGeneration: function(forceSplit) {\n      if (forceSplit)\n        { this.history.lastOp = this.history.lastSelOp = this.history.lastOrigin = null; }\n      return this.history.generation\n    },\n    isClean: function (gen) {\n      return this.history.generation == (gen || this.cleanGeneration)\n    },\n\n    getHistory: function() {\n      return {done: copyHistoryArray(this.history.done),\n              undone: copyHistoryArray(this.history.undone)}\n    },\n    setHistory: function(histData) {\n      var hist = this.history = new History(this.history.maxGeneration);\n      hist.done = copyHistoryArray(histData.done.slice(0), null, true);\n      hist.undone = copyHistoryArray(histData.undone.slice(0), null, true);\n    },\n\n    setGutterMarker: docMethodOp(function(line, gutterID, value) {\n      return changeLine(this, line, \"gutter\", function (line) {\n        var markers = line.gutterMarkers || (line.gutterMarkers = {});\n        markers[gutterID] = value;\n        if (!value && isEmpty(markers)) { line.gutterMarkers = null; }\n        return true\n      })\n    }),\n\n    clearGutter: docMethodOp(function(gutterID) {\n      var this$1 = this;\n\n      this.iter(function (line) {\n        if (line.gutterMarkers && line.gutterMarkers[gutterID]) {\n          changeLine(this$1, line, \"gutter\", function () {\n            line.gutterMarkers[gutterID] = null;\n            if (isEmpty(line.gutterMarkers)) { line.gutterMarkers = null; }\n            return true\n          });\n        }\n      });\n    }),\n\n    lineInfo: function(line) {\n      var n;\n      if (typeof line == \"number\") {\n        if (!isLine(this, line)) { return null }\n        n = line;\n        line = getLine(this, line);\n        if (!line) { return null }\n      } else {\n        n = lineNo(line);\n        if (n == null) { return null }\n      }\n      return {line: n, handle: line, text: line.text, gutterMarkers: line.gutterMarkers,\n              textClass: line.textClass, bgClass: line.bgClass, wrapClass: line.wrapClass,\n              widgets: line.widgets}\n    },\n\n    addLineClass: docMethodOp(function(handle, where, cls) {\n      return changeLine(this, handle, where == \"gutter\" ? \"gutter\" : \"class\", function (line) {\n        var prop = where == \"text\" ? \"textClass\"\n                 : where == \"background\" ? \"bgClass\"\n                 : where == \"gutter\" ? \"gutterClass\" : \"wrapClass\";\n        if (!line[prop]) { line[prop] = cls; }\n        else if (classTest(cls).test(line[prop])) { return false }\n        else { line[prop] += \" \" + cls; }\n        return true\n      })\n    }),\n    removeLineClass: docMethodOp(function(handle, where, cls) {\n      return changeLine(this, handle, where == \"gutter\" ? \"gutter\" : \"class\", function (line) {\n        var prop = where == \"text\" ? \"textClass\"\n                 : where == \"background\" ? \"bgClass\"\n                 : where == \"gutter\" ? \"gutterClass\" : \"wrapClass\";\n        var cur = line[prop];\n        if (!cur) { return false }\n        else if (cls == null) { line[prop] = null; }\n        else {\n          var found = cur.match(classTest(cls));\n          if (!found) { return false }\n          var end = found.index + found[0].length;\n          line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? \"\" : \" \") + cur.slice(end) || null;\n        }\n        return true\n      })\n    }),\n\n    addLineWidget: docMethodOp(function(handle, node, options) {\n      return addLineWidget(this, handle, node, options)\n    }),\n    removeLineWidget: function(widget) { widget.clear(); },\n\n    markText: function(from, to, options) {\n      return markText(this, clipPos(this, from), clipPos(this, to), options, options && options.type || \"range\")\n    },\n    setBookmark: function(pos, options) {\n      var realOpts = {replacedWith: options && (options.nodeType == null ? options.widget : options),\n                      insertLeft: options && options.insertLeft,\n                      clearWhenEmpty: false, shared: options && options.shared,\n                      handleMouseEvents: options && options.handleMouseEvents};\n      pos = clipPos(this, pos);\n      return markText(this, pos, pos, realOpts, \"bookmark\")\n    },\n    findMarksAt: function(pos) {\n      pos = clipPos(this, pos);\n      var markers = [], spans = getLine(this, pos.line).markedSpans;\n      if (spans) { for (var i = 0; i < spans.length; ++i) {\n        var span = spans[i];\n        if ((span.from == null || span.from <= pos.ch) &&\n            (span.to == null || span.to >= pos.ch))\n          { markers.push(span.marker.parent || span.marker); }\n      } }\n      return markers\n    },\n    findMarks: function(from, to, filter) {\n      from = clipPos(this, from); to = clipPos(this, to);\n      var found = [], lineNo = from.line;\n      this.iter(from.line, to.line + 1, function (line) {\n        var spans = line.markedSpans;\n        if (spans) { for (var i = 0; i < spans.length; i++) {\n          var span = spans[i];\n          if (!(span.to != null && lineNo == from.line && from.ch >= span.to ||\n                span.from == null && lineNo != from.line ||\n                span.from != null && lineNo == to.line && span.from >= to.ch) &&\n              (!filter || filter(span.marker)))\n            { found.push(span.marker.parent || span.marker); }\n        } }\n        ++lineNo;\n      });\n      return found\n    },\n    getAllMarks: function() {\n      var markers = [];\n      this.iter(function (line) {\n        var sps = line.markedSpans;\n        if (sps) { for (var i = 0; i < sps.length; ++i)\n          { if (sps[i].from != null) { markers.push(sps[i].marker); } } }\n      });\n      return markers\n    },\n\n    posFromIndex: function(off) {\n      var ch, lineNo = this.first, sepSize = this.lineSeparator().length;\n      this.iter(function (line) {\n        var sz = line.text.length + sepSize;\n        if (sz > off) { ch = off; return true }\n        off -= sz;\n        ++lineNo;\n      });\n      return clipPos(this, Pos(lineNo, ch))\n    },\n    indexFromPos: function (coords) {\n      coords = clipPos(this, coords);\n      var index = coords.ch;\n      if (coords.line < this.first || coords.ch < 0) { return 0 }\n      var sepSize = this.lineSeparator().length;\n      this.iter(this.first, coords.line, function (line) { // iter aborts when callback returns a truthy value\n        index += line.text.length + sepSize;\n      });\n      return index\n    },\n\n    copy: function(copyHistory) {\n      var doc = new Doc(getLines(this, this.first, this.first + this.size),\n                        this.modeOption, this.first, this.lineSep, this.direction);\n      doc.scrollTop = this.scrollTop; doc.scrollLeft = this.scrollLeft;\n      doc.sel = this.sel;\n      doc.extend = false;\n      if (copyHistory) {\n        doc.history.undoDepth = this.history.undoDepth;\n        doc.setHistory(this.getHistory());\n      }\n      return doc\n    },\n\n    linkedDoc: function(options) {\n      if (!options) { options = {}; }\n      var from = this.first, to = this.first + this.size;\n      if (options.from != null && options.from > from) { from = options.from; }\n      if (options.to != null && options.to < to) { to = options.to; }\n      var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from, this.lineSep, this.direction);\n      if (options.sharedHist) { copy.history = this.history\n      ; }(this.linked || (this.linked = [])).push({doc: copy, sharedHist: options.sharedHist});\n      copy.linked = [{doc: this, isParent: true, sharedHist: options.sharedHist}];\n      copySharedMarkers(copy, findSharedMarkers(this));\n      return copy\n    },\n    unlinkDoc: function(other) {\n      if (other instanceof CodeMirror) { other = other.doc; }\n      if (this.linked) { for (var i = 0; i < this.linked.length; ++i) {\n        var link = this.linked[i];\n        if (link.doc != other) { continue }\n        this.linked.splice(i, 1);\n        other.unlinkDoc(this);\n        detachSharedMarkers(findSharedMarkers(this));\n        break\n      } }\n      // If the histories were shared, split them again\n      if (other.history == this.history) {\n        var splitIds = [other.id];\n        linkedDocs(other, function (doc) { return splitIds.push(doc.id); }, true);\n        other.history = new History(null);\n        other.history.done = copyHistoryArray(this.history.done, splitIds);\n        other.history.undone = copyHistoryArray(this.history.undone, splitIds);\n      }\n    },\n    iterLinkedDocs: function(f) {linkedDocs(this, f);},\n\n    getMode: function() {return this.mode},\n    getEditor: function() {return this.cm},\n\n    splitLines: function(str) {\n      if (this.lineSep) { return str.split(this.lineSep) }\n      return splitLinesAuto(str)\n    },\n    lineSeparator: function() { return this.lineSep || \"\\n\" },\n\n    setDirection: docMethodOp(function (dir) {\n      if (dir != \"rtl\") { dir = \"ltr\"; }\n      if (dir == this.direction) { return }\n      this.direction = dir;\n      this.iter(function (line) { return line.order = null; });\n      if (this.cm) { directionChanged(this.cm); }\n    })\n  });\n\n  // Public alias.\n  Doc.prototype.eachLine = Doc.prototype.iter;\n\n  // Kludge to work around strange IE behavior where it'll sometimes\n  // re-fire a series of drag-related events right after the drop (#1551)\n  var lastDrop = 0;\n\n  function onDrop(e) {\n    var cm = this;\n    clearDragCursor(cm);\n    if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e))\n      { return }\n    e_preventDefault(e);\n    if (ie) { lastDrop = +new Date; }\n    var pos = posFromMouse(cm, e, true), files = e.dataTransfer.files;\n    if (!pos || cm.isReadOnly()) { return }\n    // Might be a file drop, in which case we simply extract the text\n    // and insert it.\n    if (files && files.length && window.FileReader && window.File) {\n      var n = files.length, text = Array(n), read = 0;\n      var markAsReadAndPasteIfAllFilesAreRead = function () {\n        if (++read == n) {\n          operation(cm, function () {\n            pos = clipPos(cm.doc, pos);\n            var change = {from: pos, to: pos,\n                          text: cm.doc.splitLines(\n                              text.filter(function (t) { return t != null; }).join(cm.doc.lineSeparator())),\n                          origin: \"paste\"};\n            makeChange(cm.doc, change);\n            setSelectionReplaceHistory(cm.doc, simpleSelection(clipPos(cm.doc, pos), clipPos(cm.doc, changeEnd(change))));\n          })();\n        }\n      };\n      var readTextFromFile = function (file, i) {\n        if (cm.options.allowDropFileTypes &&\n            indexOf(cm.options.allowDropFileTypes, file.type) == -1) {\n          markAsReadAndPasteIfAllFilesAreRead();\n          return\n        }\n        var reader = new FileReader;\n        reader.onerror = function () { return markAsReadAndPasteIfAllFilesAreRead(); };\n        reader.onload = function () {\n          var content = reader.result;\n          if (/[\\x00-\\x08\\x0e-\\x1f]{2}/.test(content)) {\n            markAsReadAndPasteIfAllFilesAreRead();\n            return\n          }\n          text[i] = content;\n          markAsReadAndPasteIfAllFilesAreRead();\n        };\n        reader.readAsText(file);\n      };\n      for (var i = 0; i < files.length; i++) { readTextFromFile(files[i], i); }\n    } else { // Normal drop\n      // Don't do a replace if the drop happened inside of the selected text.\n      if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {\n        cm.state.draggingText(e);\n        // Ensure the editor is re-focused\n        setTimeout(function () { return cm.display.input.focus(); }, 20);\n        return\n      }\n      try {\n        var text$1 = e.dataTransfer.getData(\"Text\");\n        if (text$1) {\n          var selected;\n          if (cm.state.draggingText && !cm.state.draggingText.copy)\n            { selected = cm.listSelections(); }\n          setSelectionNoUndo(cm.doc, simpleSelection(pos, pos));\n          if (selected) { for (var i$1 = 0; i$1 < selected.length; ++i$1)\n            { replaceRange(cm.doc, \"\", selected[i$1].anchor, selected[i$1].head, \"drag\"); } }\n          cm.replaceSelection(text$1, \"around\", \"paste\");\n          cm.display.input.focus();\n        }\n      }\n      catch(e){}\n    }\n  }\n\n  function onDragStart(cm, e) {\n    if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) { e_stop(e); return }\n    if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) { return }\n\n    e.dataTransfer.setData(\"Text\", cm.getSelection());\n    e.dataTransfer.effectAllowed = \"copyMove\";\n\n    // Use dummy image instead of default browsers image.\n    // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.\n    if (e.dataTransfer.setDragImage && !safari) {\n      var img = elt(\"img\", null, null, \"position: fixed; left: 0; top: 0;\");\n      img.src = \"data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\";\n      if (presto) {\n        img.width = img.height = 1;\n        cm.display.wrapper.appendChild(img);\n        // Force a relayout, or Opera won't use our image for some obscure reason\n        img._top = img.offsetTop;\n      }\n      e.dataTransfer.setDragImage(img, 0, 0);\n      if (presto) { img.parentNode.removeChild(img); }\n    }\n  }\n\n  function onDragOver(cm, e) {\n    var pos = posFromMouse(cm, e);\n    if (!pos) { return }\n    var frag = document.createDocumentFragment();\n    drawSelectionCursor(cm, pos, frag);\n    if (!cm.display.dragCursor) {\n      cm.display.dragCursor = elt(\"div\", null, \"CodeMirror-cursors CodeMirror-dragcursors\");\n      cm.display.lineSpace.insertBefore(cm.display.dragCursor, cm.display.cursorDiv);\n    }\n    removeChildrenAndAdd(cm.display.dragCursor, frag);\n  }\n\n  function clearDragCursor(cm) {\n    if (cm.display.dragCursor) {\n      cm.display.lineSpace.removeChild(cm.display.dragCursor);\n      cm.display.dragCursor = null;\n    }\n  }\n\n  // These must be handled carefully, because naively registering a\n  // handler for each editor will cause the editors to never be\n  // garbage collected.\n\n  function forEachCodeMirror(f) {\n    if (!document.getElementsByClassName) { return }\n    var byClass = document.getElementsByClassName(\"CodeMirror\"), editors = [];\n    for (var i = 0; i < byClass.length; i++) {\n      var cm = byClass[i].CodeMirror;\n      if (cm) { editors.push(cm); }\n    }\n    if (editors.length) { editors[0].operation(function () {\n      for (var i = 0; i < editors.length; i++) { f(editors[i]); }\n    }); }\n  }\n\n  var globalsRegistered = false;\n  function ensureGlobalHandlers() {\n    if (globalsRegistered) { return }\n    registerGlobalHandlers();\n    globalsRegistered = true;\n  }\n  function registerGlobalHandlers() {\n    // When the window resizes, we need to refresh active editors.\n    var resizeTimer;\n    on(window, \"resize\", function () {\n      if (resizeTimer == null) { resizeTimer = setTimeout(function () {\n        resizeTimer = null;\n        forEachCodeMirror(onResize);\n      }, 100); }\n    });\n    // When the window loses focus, we want to show the editor as blurred\n    on(window, \"blur\", function () { return forEachCodeMirror(onBlur); });\n  }\n  // Called when the window resizes\n  function onResize(cm) {\n    var d = cm.display;\n    // Might be a text scaling operation, clear size caches.\n    d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;\n    d.scrollbarsClipped = false;\n    cm.setSize();\n  }\n\n  var keyNames = {\n    3: \"Pause\", 8: \"Backspace\", 9: \"Tab\", 13: \"Enter\", 16: \"Shift\", 17: \"Ctrl\", 18: \"Alt\",\n    19: \"Pause\", 20: \"CapsLock\", 27: \"Esc\", 32: \"Space\", 33: \"PageUp\", 34: \"PageDown\", 35: \"End\",\n    36: \"Home\", 37: \"Left\", 38: \"Up\", 39: \"Right\", 40: \"Down\", 44: \"PrintScrn\", 45: \"Insert\",\n    46: \"Delete\", 59: \";\", 61: \"=\", 91: \"Mod\", 92: \"Mod\", 93: \"Mod\",\n    106: \"*\", 107: \"=\", 109: \"-\", 110: \".\", 111: \"/\", 145: \"ScrollLock\",\n    173: \"-\", 186: \";\", 187: \"=\", 188: \",\", 189: \"-\", 190: \".\", 191: \"/\", 192: \"`\", 219: \"[\", 220: \"\\\\\",\n    221: \"]\", 222: \"'\", 63232: \"Up\", 63233: \"Down\", 63234: \"Left\", 63235: \"Right\", 63272: \"Delete\",\n    63273: \"Home\", 63275: \"End\", 63276: \"PageUp\", 63277: \"PageDown\", 63302: \"Insert\"\n  };\n\n  // Number keys\n  for (var i = 0; i < 10; i++) { keyNames[i + 48] = keyNames[i + 96] = String(i); }\n  // Alphabetic keys\n  for (var i$1 = 65; i$1 <= 90; i$1++) { keyNames[i$1] = String.fromCharCode(i$1); }\n  // Function keys\n  for (var i$2 = 1; i$2 <= 12; i$2++) { keyNames[i$2 + 111] = keyNames[i$2 + 63235] = \"F\" + i$2; }\n\n  var keyMap = {};\n\n  keyMap.basic = {\n    \"Left\": \"goCharLeft\", \"Right\": \"goCharRight\", \"Up\": \"goLineUp\", \"Down\": \"goLineDown\",\n    \"End\": \"goLineEnd\", \"Home\": \"goLineStartSmart\", \"PageUp\": \"goPageUp\", \"PageDown\": \"goPageDown\",\n    \"Delete\": \"delCharAfter\", \"Backspace\": \"delCharBefore\", \"Shift-Backspace\": \"delCharBefore\",\n    \"Tab\": \"defaultTab\", \"Shift-Tab\": \"indentAuto\",\n    \"Enter\": \"newlineAndIndent\", \"Insert\": \"toggleOverwrite\",\n    \"Esc\": \"singleSelection\"\n  };\n  // Note that the save and find-related commands aren't defined by\n  // default. User code or addons can define them. Unknown commands\n  // are simply ignored.\n  keyMap.pcDefault = {\n    \"Ctrl-A\": \"selectAll\", \"Ctrl-D\": \"deleteLine\", \"Ctrl-Z\": \"undo\", \"Shift-Ctrl-Z\": \"redo\", \"Ctrl-Y\": \"redo\",\n    \"Ctrl-Home\": \"goDocStart\", \"Ctrl-End\": \"goDocEnd\", \"Ctrl-Up\": \"goLineUp\", \"Ctrl-Down\": \"goLineDown\",\n    \"Ctrl-Left\": \"goGroupLeft\", \"Ctrl-Right\": \"goGroupRight\", \"Alt-Left\": \"goLineStart\", \"Alt-Right\": \"goLineEnd\",\n    \"Ctrl-Backspace\": \"delGroupBefore\", \"Ctrl-Delete\": \"delGroupAfter\", \"Ctrl-S\": \"save\", \"Ctrl-F\": \"find\",\n    \"Ctrl-G\": \"findNext\", \"Shift-Ctrl-G\": \"findPrev\", \"Shift-Ctrl-F\": \"replace\", \"Shift-Ctrl-R\": \"replaceAll\",\n    \"Ctrl-[\": \"indentLess\", \"Ctrl-]\": \"indentMore\",\n    \"Ctrl-U\": \"undoSelection\", \"Shift-Ctrl-U\": \"redoSelection\", \"Alt-U\": \"redoSelection\",\n    \"fallthrough\": \"basic\"\n  };\n  // Very basic readline/emacs-style bindings, which are standard on Mac.\n  keyMap.emacsy = {\n    \"Ctrl-F\": \"goCharRight\", \"Ctrl-B\": \"goCharLeft\", \"Ctrl-P\": \"goLineUp\", \"Ctrl-N\": \"goLineDown\",\n    \"Alt-F\": \"goWordRight\", \"Alt-B\": \"goWordLeft\", \"Ctrl-A\": \"goLineStart\", \"Ctrl-E\": \"goLineEnd\",\n    \"Ctrl-V\": \"goPageDown\", \"Shift-Ctrl-V\": \"goPageUp\", \"Ctrl-D\": \"delCharAfter\", \"Ctrl-H\": \"delCharBefore\",\n    \"Alt-D\": \"delWordAfter\", \"Alt-Backspace\": \"delWordBefore\", \"Ctrl-K\": \"killLine\", \"Ctrl-T\": \"transposeChars\",\n    \"Ctrl-O\": \"openLine\"\n  };\n  keyMap.macDefault = {\n    \"Cmd-A\": \"selectAll\", \"Cmd-D\": \"deleteLine\", \"Cmd-Z\": \"undo\", \"Shift-Cmd-Z\": \"redo\", \"Cmd-Y\": \"redo\",\n    \"Cmd-Home\": \"goDocStart\", \"Cmd-Up\": \"goDocStart\", \"Cmd-End\": \"goDocEnd\", \"Cmd-Down\": \"goDocEnd\", \"Alt-Left\": \"goGroupLeft\",\n    \"Alt-Right\": \"goGroupRight\", \"Cmd-Left\": \"goLineLeft\", \"Cmd-Right\": \"goLineRight\", \"Alt-Backspace\": \"delGroupBefore\",\n    \"Ctrl-Alt-Backspace\": \"delGroupAfter\", \"Alt-Delete\": \"delGroupAfter\", \"Cmd-S\": \"save\", \"Cmd-F\": \"find\",\n    \"Cmd-G\": \"findNext\", \"Shift-Cmd-G\": \"findPrev\", \"Cmd-Alt-F\": \"replace\", \"Shift-Cmd-Alt-F\": \"replaceAll\",\n    \"Cmd-[\": \"indentLess\", \"Cmd-]\": \"indentMore\", \"Cmd-Backspace\": \"delWrappedLineLeft\", \"Cmd-Delete\": \"delWrappedLineRight\",\n    \"Cmd-U\": \"undoSelection\", \"Shift-Cmd-U\": \"redoSelection\", \"Ctrl-Up\": \"goDocStart\", \"Ctrl-Down\": \"goDocEnd\",\n    \"fallthrough\": [\"basic\", \"emacsy\"]\n  };\n  keyMap[\"default\"] = mac ? keyMap.macDefault : keyMap.pcDefault;\n\n  // KEYMAP DISPATCH\n\n  function normalizeKeyName(name) {\n    var parts = name.split(/-(?!$)/);\n    name = parts[parts.length - 1];\n    var alt, ctrl, shift, cmd;\n    for (var i = 0; i < parts.length - 1; i++) {\n      var mod = parts[i];\n      if (/^(cmd|meta|m)$/i.test(mod)) { cmd = true; }\n      else if (/^a(lt)?$/i.test(mod)) { alt = true; }\n      else if (/^(c|ctrl|control)$/i.test(mod)) { ctrl = true; }\n      else if (/^s(hift)?$/i.test(mod)) { shift = true; }\n      else { throw new Error(\"Unrecognized modifier name: \" + mod) }\n    }\n    if (alt) { name = \"Alt-\" + name; }\n    if (ctrl) { name = \"Ctrl-\" + name; }\n    if (cmd) { name = \"Cmd-\" + name; }\n    if (shift) { name = \"Shift-\" + name; }\n    return name\n  }\n\n  // This is a kludge to keep keymaps mostly working as raw objects\n  // (backwards compatibility) while at the same time support features\n  // like normalization and multi-stroke key bindings. It compiles a\n  // new normalized keymap, and then updates the old object to reflect\n  // this.\n  function normalizeKeyMap(keymap) {\n    var copy = {};\n    for (var keyname in keymap) { if (keymap.hasOwnProperty(keyname)) {\n      var value = keymap[keyname];\n      if (/^(name|fallthrough|(de|at)tach)$/.test(keyname)) { continue }\n      if (value == \"...\") { delete keymap[keyname]; continue }\n\n      var keys = map(keyname.split(\" \"), normalizeKeyName);\n      for (var i = 0; i < keys.length; i++) {\n        var val = (void 0), name = (void 0);\n        if (i == keys.length - 1) {\n          name = keys.join(\" \");\n          val = value;\n        } else {\n          name = keys.slice(0, i + 1).join(\" \");\n          val = \"...\";\n        }\n        var prev = copy[name];\n        if (!prev) { copy[name] = val; }\n        else if (prev != val) { throw new Error(\"Inconsistent bindings for \" + name) }\n      }\n      delete keymap[keyname];\n    } }\n    for (var prop in copy) { keymap[prop] = copy[prop]; }\n    return keymap\n  }\n\n  function lookupKey(key, map, handle, context) {\n    map = getKeyMap(map);\n    var found = map.call ? map.call(key, context) : map[key];\n    if (found === false) { return \"nothing\" }\n    if (found === \"...\") { return \"multi\" }\n    if (found != null && handle(found)) { return \"handled\" }\n\n    if (map.fallthrough) {\n      if (Object.prototype.toString.call(map.fallthrough) != \"[object Array]\")\n        { return lookupKey(key, map.fallthrough, handle, context) }\n      for (var i = 0; i < map.fallthrough.length; i++) {\n        var result = lookupKey(key, map.fallthrough[i], handle, context);\n        if (result) { return result }\n      }\n    }\n  }\n\n  // Modifier key presses don't count as 'real' key presses for the\n  // purpose of keymap fallthrough.\n  function isModifierKey(value) {\n    var name = typeof value == \"string\" ? value : keyNames[value.keyCode];\n    return name == \"Ctrl\" || name == \"Alt\" || name == \"Shift\" || name == \"Mod\"\n  }\n\n  function addModifierNames(name, event, noShift) {\n    var base = name;\n    if (event.altKey && base != \"Alt\") { name = \"Alt-\" + name; }\n    if ((flipCtrlCmd ? event.metaKey : event.ctrlKey) && base != \"Ctrl\") { name = \"Ctrl-\" + name; }\n    if ((flipCtrlCmd ? event.ctrlKey : event.metaKey) && base != \"Cmd\") { name = \"Cmd-\" + name; }\n    if (!noShift && event.shiftKey && base != \"Shift\") { name = \"Shift-\" + name; }\n    return name\n  }\n\n  // Look up the name of a key as indicated by an event object.\n  function keyName(event, noShift) {\n    if (presto && event.keyCode == 34 && event[\"char\"]) { return false }\n    var name = keyNames[event.keyCode];\n    if (name == null || event.altGraphKey) { return false }\n    // Ctrl-ScrollLock has keyCode 3, same as Ctrl-Pause,\n    // so we'll use event.code when available (Chrome 48+, FF 38+, Safari 10.1+)\n    if (event.keyCode == 3 && event.code) { name = event.code; }\n    return addModifierNames(name, event, noShift)\n  }\n\n  function getKeyMap(val) {\n    return typeof val == \"string\" ? keyMap[val] : val\n  }\n\n  // Helper for deleting text near the selection(s), used to implement\n  // backspace, delete, and similar functionality.\n  function deleteNearSelection(cm, compute) {\n    var ranges = cm.doc.sel.ranges, kill = [];\n    // Build up a set of ranges to kill first, merging overlapping\n    // ranges.\n    for (var i = 0; i < ranges.length; i++) {\n      var toKill = compute(ranges[i]);\n      while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {\n        var replaced = kill.pop();\n        if (cmp(replaced.from, toKill.from) < 0) {\n          toKill.from = replaced.from;\n          break\n        }\n      }\n      kill.push(toKill);\n    }\n    // Next, remove those actual ranges.\n    runInOp(cm, function () {\n      for (var i = kill.length - 1; i >= 0; i--)\n        { replaceRange(cm.doc, \"\", kill[i].from, kill[i].to, \"+delete\"); }\n      ensureCursorVisible(cm);\n    });\n  }\n\n  function moveCharLogically(line, ch, dir) {\n    var target = skipExtendingChars(line.text, ch + dir, dir);\n    return target < 0 || target > line.text.length ? null : target\n  }\n\n  function moveLogically(line, start, dir) {\n    var ch = moveCharLogically(line, start.ch, dir);\n    return ch == null ? null : new Pos(start.line, ch, dir < 0 ? \"after\" : \"before\")\n  }\n\n  function endOfLine(visually, cm, lineObj, lineNo, dir) {\n    if (visually) {\n      if (cm.doc.direction == \"rtl\") { dir = -dir; }\n      var order = getOrder(lineObj, cm.doc.direction);\n      if (order) {\n        var part = dir < 0 ? lst(order) : order[0];\n        var moveInStorageOrder = (dir < 0) == (part.level == 1);\n        var sticky = moveInStorageOrder ? \"after\" : \"before\";\n        var ch;\n        // With a wrapped rtl chunk (possibly spanning multiple bidi parts),\n        // it could be that the last bidi part is not on the last visual line,\n        // since visual lines contain content order-consecutive chunks.\n        // Thus, in rtl, we are looking for the first (content-order) character\n        // in the rtl chunk that is on the last line (that is, the same line\n        // as the last (content-order) character).\n        if (part.level > 0 || cm.doc.direction == \"rtl\") {\n          var prep = prepareMeasureForLine(cm, lineObj);\n          ch = dir < 0 ? lineObj.text.length - 1 : 0;\n          var targetTop = measureCharPrepared(cm, prep, ch).top;\n          ch = findFirst(function (ch) { return measureCharPrepared(cm, prep, ch).top == targetTop; }, (dir < 0) == (part.level == 1) ? part.from : part.to - 1, ch);\n          if (sticky == \"before\") { ch = moveCharLogically(lineObj, ch, 1); }\n        } else { ch = dir < 0 ? part.to : part.from; }\n        return new Pos(lineNo, ch, sticky)\n      }\n    }\n    return new Pos(lineNo, dir < 0 ? lineObj.text.length : 0, dir < 0 ? \"before\" : \"after\")\n  }\n\n  function moveVisually(cm, line, start, dir) {\n    var bidi = getOrder(line, cm.doc.direction);\n    if (!bidi) { return moveLogically(line, start, dir) }\n    if (start.ch >= line.text.length) {\n      start.ch = line.text.length;\n      start.sticky = \"before\";\n    } else if (start.ch <= 0) {\n      start.ch = 0;\n      start.sticky = \"after\";\n    }\n    var partPos = getBidiPartAt(bidi, start.ch, start.sticky), part = bidi[partPos];\n    if (cm.doc.direction == \"ltr\" && part.level % 2 == 0 && (dir > 0 ? part.to > start.ch : part.from < start.ch)) {\n      // Case 1: We move within an ltr part in an ltr editor. Even with wrapped lines,\n      // nothing interesting happens.\n      return moveLogically(line, start, dir)\n    }\n\n    var mv = function (pos, dir) { return moveCharLogically(line, pos instanceof Pos ? pos.ch : pos, dir); };\n    var prep;\n    var getWrappedLineExtent = function (ch) {\n      if (!cm.options.lineWrapping) { return {begin: 0, end: line.text.length} }\n      prep = prep || prepareMeasureForLine(cm, line);\n      return wrappedLineExtentChar(cm, line, prep, ch)\n    };\n    var wrappedLineExtent = getWrappedLineExtent(start.sticky == \"before\" ? mv(start, -1) : start.ch);\n\n    if (cm.doc.direction == \"rtl\" || part.level == 1) {\n      var moveInStorageOrder = (part.level == 1) == (dir < 0);\n      var ch = mv(start, moveInStorageOrder ? 1 : -1);\n      if (ch != null && (!moveInStorageOrder ? ch >= part.from && ch >= wrappedLineExtent.begin : ch <= part.to && ch <= wrappedLineExtent.end)) {\n        // Case 2: We move within an rtl part or in an rtl editor on the same visual line\n        var sticky = moveInStorageOrder ? \"before\" : \"after\";\n        return new Pos(start.line, ch, sticky)\n      }\n    }\n\n    // Case 3: Could not move within this bidi part in this visual line, so leave\n    // the current bidi part\n\n    var searchInVisualLine = function (partPos, dir, wrappedLineExtent) {\n      var getRes = function (ch, moveInStorageOrder) { return moveInStorageOrder\n        ? new Pos(start.line, mv(ch, 1), \"before\")\n        : new Pos(start.line, ch, \"after\"); };\n\n      for (; partPos >= 0 && partPos < bidi.length; partPos += dir) {\n        var part = bidi[partPos];\n        var moveInStorageOrder = (dir > 0) == (part.level != 1);\n        var ch = moveInStorageOrder ? wrappedLineExtent.begin : mv(wrappedLineExtent.end, -1);\n        if (part.from <= ch && ch < part.to) { return getRes(ch, moveInStorageOrder) }\n        ch = moveInStorageOrder ? part.from : mv(part.to, -1);\n        if (wrappedLineExtent.begin <= ch && ch < wrappedLineExtent.end) { return getRes(ch, moveInStorageOrder) }\n      }\n    };\n\n    // Case 3a: Look for other bidi parts on the same visual line\n    var res = searchInVisualLine(partPos + dir, dir, wrappedLineExtent);\n    if (res) { return res }\n\n    // Case 3b: Look for other bidi parts on the next visual line\n    var nextCh = dir > 0 ? wrappedLineExtent.end : mv(wrappedLineExtent.begin, -1);\n    if (nextCh != null && !(dir > 0 && nextCh == line.text.length)) {\n      res = searchInVisualLine(dir > 0 ? 0 : bidi.length - 1, dir, getWrappedLineExtent(nextCh));\n      if (res) { return res }\n    }\n\n    // Case 4: Nowhere to move\n    return null\n  }\n\n  // Commands are parameter-less actions that can be performed on an\n  // editor, mostly used for keybindings.\n  var commands = {\n    selectAll: selectAll,\n    singleSelection: function (cm) { return cm.setSelection(cm.getCursor(\"anchor\"), cm.getCursor(\"head\"), sel_dontScroll); },\n    killLine: function (cm) { return deleteNearSelection(cm, function (range) {\n      if (range.empty()) {\n        var len = getLine(cm.doc, range.head.line).text.length;\n        if (range.head.ch == len && range.head.line < cm.lastLine())\n          { return {from: range.head, to: Pos(range.head.line + 1, 0)} }\n        else\n          { return {from: range.head, to: Pos(range.head.line, len)} }\n      } else {\n        return {from: range.from(), to: range.to()}\n      }\n    }); },\n    deleteLine: function (cm) { return deleteNearSelection(cm, function (range) { return ({\n      from: Pos(range.from().line, 0),\n      to: clipPos(cm.doc, Pos(range.to().line + 1, 0))\n    }); }); },\n    delLineLeft: function (cm) { return deleteNearSelection(cm, function (range) { return ({\n      from: Pos(range.from().line, 0), to: range.from()\n    }); }); },\n    delWrappedLineLeft: function (cm) { return deleteNearSelection(cm, function (range) {\n      var top = cm.charCoords(range.head, \"div\").top + 5;\n      var leftPos = cm.coordsChar({left: 0, top: top}, \"div\");\n      return {from: leftPos, to: range.from()}\n    }); },\n    delWrappedLineRight: function (cm) { return deleteNearSelection(cm, function (range) {\n      var top = cm.charCoords(range.head, \"div\").top + 5;\n      var rightPos = cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, \"div\");\n      return {from: range.from(), to: rightPos }\n    }); },\n    undo: function (cm) { return cm.undo(); },\n    redo: function (cm) { return cm.redo(); },\n    undoSelection: function (cm) { return cm.undoSelection(); },\n    redoSelection: function (cm) { return cm.redoSelection(); },\n    goDocStart: function (cm) { return cm.extendSelection(Pos(cm.firstLine(), 0)); },\n    goDocEnd: function (cm) { return cm.extendSelection(Pos(cm.lastLine())); },\n    goLineStart: function (cm) { return cm.extendSelectionsBy(function (range) { return lineStart(cm, range.head.line); },\n      {origin: \"+move\", bias: 1}\n    ); },\n    goLineStartSmart: function (cm) { return cm.extendSelectionsBy(function (range) { return lineStartSmart(cm, range.head); },\n      {origin: \"+move\", bias: 1}\n    ); },\n    goLineEnd: function (cm) { return cm.extendSelectionsBy(function (range) { return lineEnd(cm, range.head.line); },\n      {origin: \"+move\", bias: -1}\n    ); },\n    goLineRight: function (cm) { return cm.extendSelectionsBy(function (range) {\n      var top = cm.cursorCoords(range.head, \"div\").top + 5;\n      return cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, \"div\")\n    }, sel_move); },\n    goLineLeft: function (cm) { return cm.extendSelectionsBy(function (range) {\n      var top = cm.cursorCoords(range.head, \"div\").top + 5;\n      return cm.coordsChar({left: 0, top: top}, \"div\")\n    }, sel_move); },\n    goLineLeftSmart: function (cm) { return cm.extendSelectionsBy(function (range) {\n      var top = cm.cursorCoords(range.head, \"div\").top + 5;\n      var pos = cm.coordsChar({left: 0, top: top}, \"div\");\n      if (pos.ch < cm.getLine(pos.line).search(/\\S/)) { return lineStartSmart(cm, range.head) }\n      return pos\n    }, sel_move); },\n    goLineUp: function (cm) { return cm.moveV(-1, \"line\"); },\n    goLineDown: function (cm) { return cm.moveV(1, \"line\"); },\n    goPageUp: function (cm) { return cm.moveV(-1, \"page\"); },\n    goPageDown: function (cm) { return cm.moveV(1, \"page\"); },\n    goCharLeft: function (cm) { return cm.moveH(-1, \"char\"); },\n    goCharRight: function (cm) { return cm.moveH(1, \"char\"); },\n    goColumnLeft: function (cm) { return cm.moveH(-1, \"column\"); },\n    goColumnRight: function (cm) { return cm.moveH(1, \"column\"); },\n    goWordLeft: function (cm) { return cm.moveH(-1, \"word\"); },\n    goGroupRight: function (cm) { return cm.moveH(1, \"group\"); },\n    goGroupLeft: function (cm) { return cm.moveH(-1, \"group\"); },\n    goWordRight: function (cm) { return cm.moveH(1, \"word\"); },\n    delCharBefore: function (cm) { return cm.deleteH(-1, \"char\"); },\n    delCharAfter: function (cm) { return cm.deleteH(1, \"char\"); },\n    delWordBefore: function (cm) { return cm.deleteH(-1, \"word\"); },\n    delWordAfter: function (cm) { return cm.deleteH(1, \"word\"); },\n    delGroupBefore: function (cm) { return cm.deleteH(-1, \"group\"); },\n    delGroupAfter: function (cm) { return cm.deleteH(1, \"group\"); },\n    indentAuto: function (cm) { return cm.indentSelection(\"smart\"); },\n    indentMore: function (cm) { return cm.indentSelection(\"add\"); },\n    indentLess: function (cm) { return cm.indentSelection(\"subtract\"); },\n    insertTab: function (cm) { return cm.replaceSelection(\"\\t\"); },\n    insertSoftTab: function (cm) {\n      var spaces = [], ranges = cm.listSelections(), tabSize = cm.options.tabSize;\n      for (var i = 0; i < ranges.length; i++) {\n        var pos = ranges[i].from();\n        var col = countColumn(cm.getLine(pos.line), pos.ch, tabSize);\n        spaces.push(spaceStr(tabSize - col % tabSize));\n      }\n      cm.replaceSelections(spaces);\n    },\n    defaultTab: function (cm) {\n      if (cm.somethingSelected()) { cm.indentSelection(\"add\"); }\n      else { cm.execCommand(\"insertTab\"); }\n    },\n    // Swap the two chars left and right of each selection's head.\n    // Move cursor behind the two swapped characters afterwards.\n    //\n    // Doesn't consider line feeds a character.\n    // Doesn't scan more than one line above to find a character.\n    // Doesn't do anything on an empty line.\n    // Doesn't do anything with non-empty selections.\n    transposeChars: function (cm) { return runInOp(cm, function () {\n      var ranges = cm.listSelections(), newSel = [];\n      for (var i = 0; i < ranges.length; i++) {\n        if (!ranges[i].empty()) { continue }\n        var cur = ranges[i].head, line = getLine(cm.doc, cur.line).text;\n        if (line) {\n          if (cur.ch == line.length) { cur = new Pos(cur.line, cur.ch - 1); }\n          if (cur.ch > 0) {\n            cur = new Pos(cur.line, cur.ch + 1);\n            cm.replaceRange(line.charAt(cur.ch - 1) + line.charAt(cur.ch - 2),\n                            Pos(cur.line, cur.ch - 2), cur, \"+transpose\");\n          } else if (cur.line > cm.doc.first) {\n            var prev = getLine(cm.doc, cur.line - 1).text;\n            if (prev) {\n              cur = new Pos(cur.line, 1);\n              cm.replaceRange(line.charAt(0) + cm.doc.lineSeparator() +\n                              prev.charAt(prev.length - 1),\n                              Pos(cur.line - 1, prev.length - 1), cur, \"+transpose\");\n            }\n          }\n        }\n        newSel.push(new Range(cur, cur));\n      }\n      cm.setSelections(newSel);\n    }); },\n    newlineAndIndent: function (cm) { return runInOp(cm, function () {\n      var sels = cm.listSelections();\n      for (var i = sels.length - 1; i >= 0; i--)\n        { cm.replaceRange(cm.doc.lineSeparator(), sels[i].anchor, sels[i].head, \"+input\"); }\n      sels = cm.listSelections();\n      for (var i$1 = 0; i$1 < sels.length; i$1++)\n        { cm.indentLine(sels[i$1].from().line, null, true); }\n      ensureCursorVisible(cm);\n    }); },\n    openLine: function (cm) { return cm.replaceSelection(\"\\n\", \"start\"); },\n    toggleOverwrite: function (cm) { return cm.toggleOverwrite(); }\n  };\n\n\n  function lineStart(cm, lineN) {\n    var line = getLine(cm.doc, lineN);\n    var visual = visualLine(line);\n    if (visual != line) { lineN = lineNo(visual); }\n    return endOfLine(true, cm, visual, lineN, 1)\n  }\n  function lineEnd(cm, lineN) {\n    var line = getLine(cm.doc, lineN);\n    var visual = visualLineEnd(line);\n    if (visual != line) { lineN = lineNo(visual); }\n    return endOfLine(true, cm, line, lineN, -1)\n  }\n  function lineStartSmart(cm, pos) {\n    var start = lineStart(cm, pos.line);\n    var line = getLine(cm.doc, start.line);\n    var order = getOrder(line, cm.doc.direction);\n    if (!order || order[0].level == 0) {\n      var firstNonWS = Math.max(start.ch, line.text.search(/\\S/));\n      var inWS = pos.line == start.line && pos.ch <= firstNonWS && pos.ch;\n      return Pos(start.line, inWS ? 0 : firstNonWS, start.sticky)\n    }\n    return start\n  }\n\n  // Run a handler that was bound to a key.\n  function doHandleBinding(cm, bound, dropShift) {\n    if (typeof bound == \"string\") {\n      bound = commands[bound];\n      if (!bound) { return false }\n    }\n    // Ensure previous input has been read, so that the handler sees a\n    // consistent view of the document\n    cm.display.input.ensurePolled();\n    var prevShift = cm.display.shift, done = false;\n    try {\n      if (cm.isReadOnly()) { cm.state.suppressEdits = true; }\n      if (dropShift) { cm.display.shift = false; }\n      done = bound(cm) != Pass;\n    } finally {\n      cm.display.shift = prevShift;\n      cm.state.suppressEdits = false;\n    }\n    return done\n  }\n\n  function lookupKeyForEditor(cm, name, handle) {\n    for (var i = 0; i < cm.state.keyMaps.length; i++) {\n      var result = lookupKey(name, cm.state.keyMaps[i], handle, cm);\n      if (result) { return result }\n    }\n    return (cm.options.extraKeys && lookupKey(name, cm.options.extraKeys, handle, cm))\n      || lookupKey(name, cm.options.keyMap, handle, cm)\n  }\n\n  // Note that, despite the name, this function is also used to check\n  // for bound mouse clicks.\n\n  var stopSeq = new Delayed;\n\n  function dispatchKey(cm, name, e, handle) {\n    var seq = cm.state.keySeq;\n    if (seq) {\n      if (isModifierKey(name)) { return \"handled\" }\n      if (/\\'$/.test(name))\n        { cm.state.keySeq = null; }\n      else\n        { stopSeq.set(50, function () {\n          if (cm.state.keySeq == seq) {\n            cm.state.keySeq = null;\n            cm.display.input.reset();\n          }\n        }); }\n      if (dispatchKeyInner(cm, seq + \" \" + name, e, handle)) { return true }\n    }\n    return dispatchKeyInner(cm, name, e, handle)\n  }\n\n  function dispatchKeyInner(cm, name, e, handle) {\n    var result = lookupKeyForEditor(cm, name, handle);\n\n    if (result == \"multi\")\n      { cm.state.keySeq = name; }\n    if (result == \"handled\")\n      { signalLater(cm, \"keyHandled\", cm, name, e); }\n\n    if (result == \"handled\" || result == \"multi\") {\n      e_preventDefault(e);\n      restartBlink(cm);\n    }\n\n    return !!result\n  }\n\n  // Handle a key from the keydown event.\n  function handleKeyBinding(cm, e) {\n    var name = keyName(e, true);\n    if (!name) { return false }\n\n    if (e.shiftKey && !cm.state.keySeq) {\n      // First try to resolve full name (including 'Shift-'). Failing\n      // that, see if there is a cursor-motion command (starting with\n      // 'go') bound to the keyname without 'Shift-'.\n      return dispatchKey(cm, \"Shift-\" + name, e, function (b) { return doHandleBinding(cm, b, true); })\n          || dispatchKey(cm, name, e, function (b) {\n               if (typeof b == \"string\" ? /^go[A-Z]/.test(b) : b.motion)\n                 { return doHandleBinding(cm, b) }\n             })\n    } else {\n      return dispatchKey(cm, name, e, function (b) { return doHandleBinding(cm, b); })\n    }\n  }\n\n  // Handle a key from the keypress event\n  function handleCharBinding(cm, e, ch) {\n    return dispatchKey(cm, \"'\" + ch + \"'\", e, function (b) { return doHandleBinding(cm, b, true); })\n  }\n\n  var lastStoppedKey = null;\n  function onKeyDown(e) {\n    var cm = this;\n    if (e.target && e.target != cm.display.input.getField()) { return }\n    cm.curOp.focus = activeElt();\n    if (signalDOMEvent(cm, e)) { return }\n    // IE does strange things with escape.\n    if (ie && ie_version < 11 && e.keyCode == 27) { e.returnValue = false; }\n    var code = e.keyCode;\n    cm.display.shift = code == 16 || e.shiftKey;\n    var handled = handleKeyBinding(cm, e);\n    if (presto) {\n      lastStoppedKey = handled ? code : null;\n      // Opera has no cut event... we try to at least catch the key combo\n      if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey))\n        { cm.replaceSelection(\"\", null, \"cut\"); }\n    }\n    if (gecko && !mac && !handled && code == 46 && e.shiftKey && !e.ctrlKey && document.execCommand)\n      { document.execCommand(\"cut\"); }\n\n    // Turn mouse into crosshair when Alt is held on Mac.\n    if (code == 18 && !/\\bCodeMirror-crosshair\\b/.test(cm.display.lineDiv.className))\n      { showCrossHair(cm); }\n  }\n\n  function showCrossHair(cm) {\n    var lineDiv = cm.display.lineDiv;\n    addClass(lineDiv, \"CodeMirror-crosshair\");\n\n    function up(e) {\n      if (e.keyCode == 18 || !e.altKey) {\n        rmClass(lineDiv, \"CodeMirror-crosshair\");\n        off(document, \"keyup\", up);\n        off(document, \"mouseover\", up);\n      }\n    }\n    on(document, \"keyup\", up);\n    on(document, \"mouseover\", up);\n  }\n\n  function onKeyUp(e) {\n    if (e.keyCode == 16) { this.doc.sel.shift = false; }\n    signalDOMEvent(this, e);\n  }\n\n  function onKeyPress(e) {\n    var cm = this;\n    if (e.target && e.target != cm.display.input.getField()) { return }\n    if (eventInWidget(cm.display, e) || signalDOMEvent(cm, e) || e.ctrlKey && !e.altKey || mac && e.metaKey) { return }\n    var keyCode = e.keyCode, charCode = e.charCode;\n    if (presto && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return}\n    if ((presto && (!e.which || e.which < 10)) && handleKeyBinding(cm, e)) { return }\n    var ch = String.fromCharCode(charCode == null ? keyCode : charCode);\n    // Some browsers fire keypress events for backspace\n    if (ch == \"\\x08\") { return }\n    if (handleCharBinding(cm, e, ch)) { return }\n    cm.display.input.onKeyPress(e);\n  }\n\n  var DOUBLECLICK_DELAY = 400;\n\n  var PastClick = function(time, pos, button) {\n    this.time = time;\n    this.pos = pos;\n    this.button = button;\n  };\n\n  PastClick.prototype.compare = function (time, pos, button) {\n    return this.time + DOUBLECLICK_DELAY > time &&\n      cmp(pos, this.pos) == 0 && button == this.button\n  };\n\n  var lastClick, lastDoubleClick;\n  function clickRepeat(pos, button) {\n    var now = +new Date;\n    if (lastDoubleClick && lastDoubleClick.compare(now, pos, button)) {\n      lastClick = lastDoubleClick = null;\n      return \"triple\"\n    } else if (lastClick && lastClick.compare(now, pos, button)) {\n      lastDoubleClick = new PastClick(now, pos, button);\n      lastClick = null;\n      return \"double\"\n    } else {\n      lastClick = new PastClick(now, pos, button);\n      lastDoubleClick = null;\n      return \"single\"\n    }\n  }\n\n  // A mouse down can be a single click, double click, triple click,\n  // start of selection drag, start of text drag, new cursor\n  // (ctrl-click), rectangle drag (alt-drag), or xwin\n  // middle-click-paste. Or it might be a click on something we should\n  // not interfere with, such as a scrollbar or widget.\n  function onMouseDown(e) {\n    var cm = this, display = cm.display;\n    if (signalDOMEvent(cm, e) || display.activeTouch && display.input.supportsTouch()) { return }\n    display.input.ensurePolled();\n    display.shift = e.shiftKey;\n\n    if (eventInWidget(display, e)) {\n      if (!webkit) {\n        // Briefly turn off draggability, to allow widgets to do\n        // normal dragging things.\n        display.scroller.draggable = false;\n        setTimeout(function () { return display.scroller.draggable = true; }, 100);\n      }\n      return\n    }\n    if (clickInGutter(cm, e)) { return }\n    var pos = posFromMouse(cm, e), button = e_button(e), repeat = pos ? clickRepeat(pos, button) : \"single\";\n    window.focus();\n\n    // #3261: make sure, that we're not starting a second selection\n    if (button == 1 && cm.state.selectingText)\n      { cm.state.selectingText(e); }\n\n    if (pos && handleMappedButton(cm, button, pos, repeat, e)) { return }\n\n    if (button == 1) {\n      if (pos) { leftButtonDown(cm, pos, repeat, e); }\n      else if (e_target(e) == display.scroller) { e_preventDefault(e); }\n    } else if (button == 2) {\n      if (pos) { extendSelection(cm.doc, pos); }\n      setTimeout(function () { return display.input.focus(); }, 20);\n    } else if (button == 3) {\n      if (captureRightClick) { cm.display.input.onContextMenu(e); }\n      else { delayBlurEvent(cm); }\n    }\n  }\n\n  function handleMappedButton(cm, button, pos, repeat, event) {\n    var name = \"Click\";\n    if (repeat == \"double\") { name = \"Double\" + name; }\n    else if (repeat == \"triple\") { name = \"Triple\" + name; }\n    name = (button == 1 ? \"Left\" : button == 2 ? \"Middle\" : \"Right\") + name;\n\n    return dispatchKey(cm,  addModifierNames(name, event), event, function (bound) {\n      if (typeof bound == \"string\") { bound = commands[bound]; }\n      if (!bound) { return false }\n      var done = false;\n      try {\n        if (cm.isReadOnly()) { cm.state.suppressEdits = true; }\n        done = bound(cm, pos) != Pass;\n      } finally {\n        cm.state.suppressEdits = false;\n      }\n      return done\n    })\n  }\n\n  function configureMouse(cm, repeat, event) {\n    var option = cm.getOption(\"configureMouse\");\n    var value = option ? option(cm, repeat, event) : {};\n    if (value.unit == null) {\n      var rect = chromeOS ? event.shiftKey && event.metaKey : event.altKey;\n      value.unit = rect ? \"rectangle\" : repeat == \"single\" ? \"char\" : repeat == \"double\" ? \"word\" : \"line\";\n    }\n    if (value.extend == null || cm.doc.extend) { value.extend = cm.doc.extend || event.shiftKey; }\n    if (value.addNew == null) { value.addNew = mac ? event.metaKey : event.ctrlKey; }\n    if (value.moveOnDrag == null) { value.moveOnDrag = !(mac ? event.altKey : event.ctrlKey); }\n    return value\n  }\n\n  function leftButtonDown(cm, pos, repeat, event) {\n    if (ie) { setTimeout(bind(ensureFocus, cm), 0); }\n    else { cm.curOp.focus = activeElt(); }\n\n    var behavior = configureMouse(cm, repeat, event);\n\n    var sel = cm.doc.sel, contained;\n    if (cm.options.dragDrop && dragAndDrop && !cm.isReadOnly() &&\n        repeat == \"single\" && (contained = sel.contains(pos)) > -1 &&\n        (cmp((contained = sel.ranges[contained]).from(), pos) < 0 || pos.xRel > 0) &&\n        (cmp(contained.to(), pos) > 0 || pos.xRel < 0))\n      { leftButtonStartDrag(cm, event, pos, behavior); }\n    else\n      { leftButtonSelect(cm, event, pos, behavior); }\n  }\n\n  // Start a text drag. When it ends, see if any dragging actually\n  // happen, and treat as a click if it didn't.\n  function leftButtonStartDrag(cm, event, pos, behavior) {\n    var display = cm.display, moved = false;\n    var dragEnd = operation(cm, function (e) {\n      if (webkit) { display.scroller.draggable = false; }\n      cm.state.draggingText = false;\n      off(display.wrapper.ownerDocument, \"mouseup\", dragEnd);\n      off(display.wrapper.ownerDocument, \"mousemove\", mouseMove);\n      off(display.scroller, \"dragstart\", dragStart);\n      off(display.scroller, \"drop\", dragEnd);\n      if (!moved) {\n        e_preventDefault(e);\n        if (!behavior.addNew)\n          { extendSelection(cm.doc, pos, null, null, behavior.extend); }\n        // Work around unexplainable focus problem in IE9 (#2127) and Chrome (#3081)\n        if ((webkit && !safari) || ie && ie_version == 9)\n          { setTimeout(function () {display.wrapper.ownerDocument.body.focus({preventScroll: true}); display.input.focus();}, 20); }\n        else\n          { display.input.focus(); }\n      }\n    });\n    var mouseMove = function(e2) {\n      moved = moved || Math.abs(event.clientX - e2.clientX) + Math.abs(event.clientY - e2.clientY) >= 10;\n    };\n    var dragStart = function () { return moved = true; };\n    // Let the drag handler handle this.\n    if (webkit) { display.scroller.draggable = true; }\n    cm.state.draggingText = dragEnd;\n    dragEnd.copy = !behavior.moveOnDrag;\n    // IE's approach to draggable\n    if (display.scroller.dragDrop) { display.scroller.dragDrop(); }\n    on(display.wrapper.ownerDocument, \"mouseup\", dragEnd);\n    on(display.wrapper.ownerDocument, \"mousemove\", mouseMove);\n    on(display.scroller, \"dragstart\", dragStart);\n    on(display.scroller, \"drop\", dragEnd);\n\n    delayBlurEvent(cm);\n    setTimeout(function () { return display.input.focus(); }, 20);\n  }\n\n  function rangeForUnit(cm, pos, unit) {\n    if (unit == \"char\") { return new Range(pos, pos) }\n    if (unit == \"word\") { return cm.findWordAt(pos) }\n    if (unit == \"line\") { return new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0))) }\n    var result = unit(cm, pos);\n    return new Range(result.from, result.to)\n  }\n\n  // Normal selection, as opposed to text dragging.\n  function leftButtonSelect(cm, event, start, behavior) {\n    var display = cm.display, doc = cm.doc;\n    e_preventDefault(event);\n\n    var ourRange, ourIndex, startSel = doc.sel, ranges = startSel.ranges;\n    if (behavior.addNew && !behavior.extend) {\n      ourIndex = doc.sel.contains(start);\n      if (ourIndex > -1)\n        { ourRange = ranges[ourIndex]; }\n      else\n        { ourRange = new Range(start, start); }\n    } else {\n      ourRange = doc.sel.primary();\n      ourIndex = doc.sel.primIndex;\n    }\n\n    if (behavior.unit == \"rectangle\") {\n      if (!behavior.addNew) { ourRange = new Range(start, start); }\n      start = posFromMouse(cm, event, true, true);\n      ourIndex = -1;\n    } else {\n      var range = rangeForUnit(cm, start, behavior.unit);\n      if (behavior.extend)\n        { ourRange = extendRange(ourRange, range.anchor, range.head, behavior.extend); }\n      else\n        { ourRange = range; }\n    }\n\n    if (!behavior.addNew) {\n      ourIndex = 0;\n      setSelection(doc, new Selection([ourRange], 0), sel_mouse);\n      startSel = doc.sel;\n    } else if (ourIndex == -1) {\n      ourIndex = ranges.length;\n      setSelection(doc, normalizeSelection(cm, ranges.concat([ourRange]), ourIndex),\n                   {scroll: false, origin: \"*mouse\"});\n    } else if (ranges.length > 1 && ranges[ourIndex].empty() && behavior.unit == \"char\" && !behavior.extend) {\n      setSelection(doc, normalizeSelection(cm, ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex + 1)), 0),\n                   {scroll: false, origin: \"*mouse\"});\n      startSel = doc.sel;\n    } else {\n      replaceOneSelection(doc, ourIndex, ourRange, sel_mouse);\n    }\n\n    var lastPos = start;\n    function extendTo(pos) {\n      if (cmp(lastPos, pos) == 0) { return }\n      lastPos = pos;\n\n      if (behavior.unit == \"rectangle\") {\n        var ranges = [], tabSize = cm.options.tabSize;\n        var startCol = countColumn(getLine(doc, start.line).text, start.ch, tabSize);\n        var posCol = countColumn(getLine(doc, pos.line).text, pos.ch, tabSize);\n        var left = Math.min(startCol, posCol), right = Math.max(startCol, posCol);\n        for (var line = Math.min(start.line, pos.line), end = Math.min(cm.lastLine(), Math.max(start.line, pos.line));\n             line <= end; line++) {\n          var text = getLine(doc, line).text, leftPos = findColumn(text, left, tabSize);\n          if (left == right)\n            { ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos))); }\n          else if (text.length > leftPos)\n            { ranges.push(new Range(Pos(line, leftPos), Pos(line, findColumn(text, right, tabSize)))); }\n        }\n        if (!ranges.length) { ranges.push(new Range(start, start)); }\n        setSelection(doc, normalizeSelection(cm, startSel.ranges.slice(0, ourIndex).concat(ranges), ourIndex),\n                     {origin: \"*mouse\", scroll: false});\n        cm.scrollIntoView(pos);\n      } else {\n        var oldRange = ourRange;\n        var range = rangeForUnit(cm, pos, behavior.unit);\n        var anchor = oldRange.anchor, head;\n        if (cmp(range.anchor, anchor) > 0) {\n          head = range.head;\n          anchor = minPos(oldRange.from(), range.anchor);\n        } else {\n          head = range.anchor;\n          anchor = maxPos(oldRange.to(), range.head);\n        }\n        var ranges$1 = startSel.ranges.slice(0);\n        ranges$1[ourIndex] = bidiSimplify(cm, new Range(clipPos(doc, anchor), head));\n        setSelection(doc, normalizeSelection(cm, ranges$1, ourIndex), sel_mouse);\n      }\n    }\n\n    var editorSize = display.wrapper.getBoundingClientRect();\n    // Used to ensure timeout re-tries don't fire when another extend\n    // happened in the meantime (clearTimeout isn't reliable -- at\n    // least on Chrome, the timeouts still happen even when cleared,\n    // if the clear happens after their scheduled firing time).\n    var counter = 0;\n\n    function extend(e) {\n      var curCount = ++counter;\n      var cur = posFromMouse(cm, e, true, behavior.unit == \"rectangle\");\n      if (!cur) { return }\n      if (cmp(cur, lastPos) != 0) {\n        cm.curOp.focus = activeElt();\n        extendTo(cur);\n        var visible = visibleLines(display, doc);\n        if (cur.line >= visible.to || cur.line < visible.from)\n          { setTimeout(operation(cm, function () {if (counter == curCount) { extend(e); }}), 150); }\n      } else {\n        var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0;\n        if (outside) { setTimeout(operation(cm, function () {\n          if (counter != curCount) { return }\n          display.scroller.scrollTop += outside;\n          extend(e);\n        }), 50); }\n      }\n    }\n\n    function done(e) {\n      cm.state.selectingText = false;\n      counter = Infinity;\n      // If e is null or undefined we interpret this as someone trying\n      // to explicitly cancel the selection rather than the user\n      // letting go of the mouse button.\n      if (e) {\n        e_preventDefault(e);\n        display.input.focus();\n      }\n      off(display.wrapper.ownerDocument, \"mousemove\", move);\n      off(display.wrapper.ownerDocument, \"mouseup\", up);\n      doc.history.lastSelOrigin = null;\n    }\n\n    var move = operation(cm, function (e) {\n      if (e.buttons === 0 || !e_button(e)) { done(e); }\n      else { extend(e); }\n    });\n    var up = operation(cm, done);\n    cm.state.selectingText = up;\n    on(display.wrapper.ownerDocument, \"mousemove\", move);\n    on(display.wrapper.ownerDocument, \"mouseup\", up);\n  }\n\n  // Used when mouse-selecting to adjust the anchor to the proper side\n  // of a bidi jump depending on the visual position of the head.\n  function bidiSimplify(cm, range) {\n    var anchor = range.anchor;\n    var head = range.head;\n    var anchorLine = getLine(cm.doc, anchor.line);\n    if (cmp(anchor, head) == 0 && anchor.sticky == head.sticky) { return range }\n    var order = getOrder(anchorLine);\n    if (!order) { return range }\n    var index = getBidiPartAt(order, anchor.ch, anchor.sticky), part = order[index];\n    if (part.from != anchor.ch && part.to != anchor.ch) { return range }\n    var boundary = index + ((part.from == anchor.ch) == (part.level != 1) ? 0 : 1);\n    if (boundary == 0 || boundary == order.length) { return range }\n\n    // Compute the relative visual position of the head compared to the\n    // anchor (<0 is to the left, >0 to the right)\n    var leftSide;\n    if (head.line != anchor.line) {\n      leftSide = (head.line - anchor.line) * (cm.doc.direction == \"ltr\" ? 1 : -1) > 0;\n    } else {\n      var headIndex = getBidiPartAt(order, head.ch, head.sticky);\n      var dir = headIndex - index || (head.ch - anchor.ch) * (part.level == 1 ? -1 : 1);\n      if (headIndex == boundary - 1 || headIndex == boundary)\n        { leftSide = dir < 0; }\n      else\n        { leftSide = dir > 0; }\n    }\n\n    var usePart = order[boundary + (leftSide ? -1 : 0)];\n    var from = leftSide == (usePart.level == 1);\n    var ch = from ? usePart.from : usePart.to, sticky = from ? \"after\" : \"before\";\n    return anchor.ch == ch && anchor.sticky == sticky ? range : new Range(new Pos(anchor.line, ch, sticky), head)\n  }\n\n\n  // Determines whether an event happened in the gutter, and fires the\n  // handlers for the corresponding event.\n  function gutterEvent(cm, e, type, prevent) {\n    var mX, mY;\n    if (e.touches) {\n      mX = e.touches[0].clientX;\n      mY = e.touches[0].clientY;\n    } else {\n      try { mX = e.clientX; mY = e.clientY; }\n      catch(e) { return false }\n    }\n    if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) { return false }\n    if (prevent) { e_preventDefault(e); }\n\n    var display = cm.display;\n    var lineBox = display.lineDiv.getBoundingClientRect();\n\n    if (mY > lineBox.bottom || !hasHandler(cm, type)) { return e_defaultPrevented(e) }\n    mY -= lineBox.top - display.viewOffset;\n\n    for (var i = 0; i < cm.display.gutterSpecs.length; ++i) {\n      var g = display.gutters.childNodes[i];\n      if (g && g.getBoundingClientRect().right >= mX) {\n        var line = lineAtHeight(cm.doc, mY);\n        var gutter = cm.display.gutterSpecs[i];\n        signal(cm, type, cm, line, gutter.className, e);\n        return e_defaultPrevented(e)\n      }\n    }\n  }\n\n  function clickInGutter(cm, e) {\n    return gutterEvent(cm, e, \"gutterClick\", true)\n  }\n\n  // CONTEXT MENU HANDLING\n\n  // To make the context menu work, we need to briefly unhide the\n  // textarea (making it as unobtrusive as possible) to let the\n  // right-click take effect on it.\n  function onContextMenu(cm, e) {\n    if (eventInWidget(cm.display, e) || contextMenuInGutter(cm, e)) { return }\n    if (signalDOMEvent(cm, e, \"contextmenu\")) { return }\n    if (!captureRightClick) { cm.display.input.onContextMenu(e); }\n  }\n\n  function contextMenuInGutter(cm, e) {\n    if (!hasHandler(cm, \"gutterContextMenu\")) { return false }\n    return gutterEvent(cm, e, \"gutterContextMenu\", false)\n  }\n\n  function themeChanged(cm) {\n    cm.display.wrapper.className = cm.display.wrapper.className.replace(/\\s*cm-s-\\S+/g, \"\") +\n      cm.options.theme.replace(/(^|\\s)\\s*/g, \" cm-s-\");\n    clearCaches(cm);\n  }\n\n  var Init = {toString: function(){return \"CodeMirror.Init\"}};\n\n  var defaults = {};\n  var optionHandlers = {};\n\n  function defineOptions(CodeMirror) {\n    var optionHandlers = CodeMirror.optionHandlers;\n\n    function option(name, deflt, handle, notOnInit) {\n      CodeMirror.defaults[name] = deflt;\n      if (handle) { optionHandlers[name] =\n        notOnInit ? function (cm, val, old) {if (old != Init) { handle(cm, val, old); }} : handle; }\n    }\n\n    CodeMirror.defineOption = option;\n\n    // Passed to option handlers when there is no old value.\n    CodeMirror.Init = Init;\n\n    // These two are, on init, called from the constructor because they\n    // have to be initialized before the editor can start at all.\n    option(\"value\", \"\", function (cm, val) { return cm.setValue(val); }, true);\n    option(\"mode\", null, function (cm, val) {\n      cm.doc.modeOption = val;\n      loadMode(cm);\n    }, true);\n\n    option(\"indentUnit\", 2, loadMode, true);\n    option(\"indentWithTabs\", false);\n    option(\"smartIndent\", true);\n    option(\"tabSize\", 4, function (cm) {\n      resetModeState(cm);\n      clearCaches(cm);\n      regChange(cm);\n    }, true);\n\n    option(\"lineSeparator\", null, function (cm, val) {\n      cm.doc.lineSep = val;\n      if (!val) { return }\n      var newBreaks = [], lineNo = cm.doc.first;\n      cm.doc.iter(function (line) {\n        for (var pos = 0;;) {\n          var found = line.text.indexOf(val, pos);\n          if (found == -1) { break }\n          pos = found + val.length;\n          newBreaks.push(Pos(lineNo, found));\n        }\n        lineNo++;\n      });\n      for (var i = newBreaks.length - 1; i >= 0; i--)\n        { replaceRange(cm.doc, val, newBreaks[i], Pos(newBreaks[i].line, newBreaks[i].ch + val.length)); }\n    });\n    option(\"specialChars\", /[\\u0000-\\u001f\\u007f-\\u009f\\u00ad\\u061c\\u200b-\\u200f\\u2028\\u2029\\ufeff\\ufff9-\\ufffc]/g, function (cm, val, old) {\n      cm.state.specialChars = new RegExp(val.source + (val.test(\"\\t\") ? \"\" : \"|\\t\"), \"g\");\n      if (old != Init) { cm.refresh(); }\n    });\n    option(\"specialCharPlaceholder\", defaultSpecialCharPlaceholder, function (cm) { return cm.refresh(); }, true);\n    option(\"electricChars\", true);\n    option(\"inputStyle\", mobile ? \"contenteditable\" : \"textarea\", function () {\n      throw new Error(\"inputStyle can not (yet) be changed in a running editor\") // FIXME\n    }, true);\n    option(\"spellcheck\", false, function (cm, val) { return cm.getInputField().spellcheck = val; }, true);\n    option(\"autocorrect\", false, function (cm, val) { return cm.getInputField().autocorrect = val; }, true);\n    option(\"autocapitalize\", false, function (cm, val) { return cm.getInputField().autocapitalize = val; }, true);\n    option(\"rtlMoveVisually\", !windows);\n    option(\"wholeLineUpdateBefore\", true);\n\n    option(\"theme\", \"default\", function (cm) {\n      themeChanged(cm);\n      updateGutters(cm);\n    }, true);\n    option(\"keyMap\", \"default\", function (cm, val, old) {\n      var next = getKeyMap(val);\n      var prev = old != Init && getKeyMap(old);\n      if (prev && prev.detach) { prev.detach(cm, next); }\n      if (next.attach) { next.attach(cm, prev || null); }\n    });\n    option(\"extraKeys\", null);\n    option(\"configureMouse\", null);\n\n    option(\"lineWrapping\", false, wrappingChanged, true);\n    option(\"gutters\", [], function (cm, val) {\n      cm.display.gutterSpecs = getGutters(val, cm.options.lineNumbers);\n      updateGutters(cm);\n    }, true);\n    option(\"fixedGutter\", true, function (cm, val) {\n      cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + \"px\" : \"0\";\n      cm.refresh();\n    }, true);\n    option(\"coverGutterNextToScrollbar\", false, function (cm) { return updateScrollbars(cm); }, true);\n    option(\"scrollbarStyle\", \"native\", function (cm) {\n      initScrollbars(cm);\n      updateScrollbars(cm);\n      cm.display.scrollbars.setScrollTop(cm.doc.scrollTop);\n      cm.display.scrollbars.setScrollLeft(cm.doc.scrollLeft);\n    }, true);\n    option(\"lineNumbers\", false, function (cm, val) {\n      cm.display.gutterSpecs = getGutters(cm.options.gutters, val);\n      updateGutters(cm);\n    }, true);\n    option(\"firstLineNumber\", 1, updateGutters, true);\n    option(\"lineNumberFormatter\", function (integer) { return integer; }, updateGutters, true);\n    option(\"showCursorWhenSelecting\", false, updateSelection, true);\n\n    option(\"resetSelectionOnContextMenu\", true);\n    option(\"lineWiseCopyCut\", true);\n    option(\"pasteLinesPerSelection\", true);\n    option(\"selectionsMayTouch\", false);\n\n    option(\"readOnly\", false, function (cm, val) {\n      if (val == \"nocursor\") {\n        onBlur(cm);\n        cm.display.input.blur();\n      }\n      cm.display.input.readOnlyChanged(val);\n    });\n\n    option(\"screenReaderLabel\", null, function (cm, val) {\n      val = (val === '') ? null : val;\n      cm.display.input.screenReaderLabelChanged(val);\n    });\n\n    option(\"disableInput\", false, function (cm, val) {if (!val) { cm.display.input.reset(); }}, true);\n    option(\"dragDrop\", true, dragDropChanged);\n    option(\"allowDropFileTypes\", null);\n\n    option(\"cursorBlinkRate\", 530);\n    option(\"cursorScrollMargin\", 0);\n    option(\"cursorHeight\", 1, updateSelection, true);\n    option(\"singleCursorHeightPerLine\", true, updateSelection, true);\n    option(\"workTime\", 100);\n    option(\"workDelay\", 100);\n    option(\"flattenSpans\", true, resetModeState, true);\n    option(\"addModeClass\", false, resetModeState, true);\n    option(\"pollInterval\", 100);\n    option(\"undoDepth\", 200, function (cm, val) { return cm.doc.history.undoDepth = val; });\n    option(\"historyEventDelay\", 1250);\n    option(\"viewportMargin\", 10, function (cm) { return cm.refresh(); }, true);\n    option(\"maxHighlightLength\", 10000, resetModeState, true);\n    option(\"moveInputWithCursor\", true, function (cm, val) {\n      if (!val) { cm.display.input.resetPosition(); }\n    });\n\n    option(\"tabindex\", null, function (cm, val) { return cm.display.input.getField().tabIndex = val || \"\"; });\n    option(\"autofocus\", null);\n    option(\"direction\", \"ltr\", function (cm, val) { return cm.doc.setDirection(val); }, true);\n    option(\"phrases\", null);\n  }\n\n  function dragDropChanged(cm, value, old) {\n    var wasOn = old && old != Init;\n    if (!value != !wasOn) {\n      var funcs = cm.display.dragFunctions;\n      var toggle = value ? on : off;\n      toggle(cm.display.scroller, \"dragstart\", funcs.start);\n      toggle(cm.display.scroller, \"dragenter\", funcs.enter);\n      toggle(cm.display.scroller, \"dragover\", funcs.over);\n      toggle(cm.display.scroller, \"dragleave\", funcs.leave);\n      toggle(cm.display.scroller, \"drop\", funcs.drop);\n    }\n  }\n\n  function wrappingChanged(cm) {\n    if (cm.options.lineWrapping) {\n      addClass(cm.display.wrapper, \"CodeMirror-wrap\");\n      cm.display.sizer.style.minWidth = \"\";\n      cm.display.sizerWidth = null;\n    } else {\n      rmClass(cm.display.wrapper, \"CodeMirror-wrap\");\n      findMaxLine(cm);\n    }\n    estimateLineHeights(cm);\n    regChange(cm);\n    clearCaches(cm);\n    setTimeout(function () { return updateScrollbars(cm); }, 100);\n  }\n\n  // A CodeMirror instance represents an editor. This is the object\n  // that user code is usually dealing with.\n\n  function CodeMirror(place, options) {\n    var this$1 = this;\n\n    if (!(this instanceof CodeMirror)) { return new CodeMirror(place, options) }\n\n    this.options = options = options ? copyObj(options) : {};\n    // Determine effective options based on given values and defaults.\n    copyObj(defaults, options, false);\n\n    var doc = options.value;\n    if (typeof doc == \"string\") { doc = new Doc(doc, options.mode, null, options.lineSeparator, options.direction); }\n    else if (options.mode) { doc.modeOption = options.mode; }\n    this.doc = doc;\n\n    var input = new CodeMirror.inputStyles[options.inputStyle](this);\n    var display = this.display = new Display(place, doc, input, options);\n    display.wrapper.CodeMirror = this;\n    themeChanged(this);\n    if (options.lineWrapping)\n      { this.display.wrapper.className += \" CodeMirror-wrap\"; }\n    initScrollbars(this);\n\n    this.state = {\n      keyMaps: [],  // stores maps added by addKeyMap\n      overlays: [], // highlighting overlays, as added by addOverlay\n      modeGen: 0,   // bumped when mode/overlay changes, used to invalidate highlighting info\n      overwrite: false,\n      delayingBlurEvent: false,\n      focused: false,\n      suppressEdits: false, // used to disable editing during key handlers when in readOnly mode\n      pasteIncoming: -1, cutIncoming: -1, // help recognize paste/cut edits in input.poll\n      selectingText: false,\n      draggingText: false,\n      highlight: new Delayed(), // stores highlight worker timeout\n      keySeq: null,  // Unfinished key sequence\n      specialChars: null\n    };\n\n    if (options.autofocus && !mobile) { display.input.focus(); }\n\n    // Override magic textarea content restore that IE sometimes does\n    // on our hidden textarea on reload\n    if (ie && ie_version < 11) { setTimeout(function () { return this$1.display.input.reset(true); }, 20); }\n\n    registerEventHandlers(this);\n    ensureGlobalHandlers();\n\n    startOperation(this);\n    this.curOp.forceUpdate = true;\n    attachDoc(this, doc);\n\n    if ((options.autofocus && !mobile) || this.hasFocus())\n      { setTimeout(bind(onFocus, this), 20); }\n    else\n      { onBlur(this); }\n\n    for (var opt in optionHandlers) { if (optionHandlers.hasOwnProperty(opt))\n      { optionHandlers[opt](this, options[opt], Init); } }\n    maybeUpdateLineNumberWidth(this);\n    if (options.finishInit) { options.finishInit(this); }\n    for (var i = 0; i < initHooks.length; ++i) { initHooks[i](this); }\n    endOperation(this);\n    // Suppress optimizelegibility in Webkit, since it breaks text\n    // measuring on line wrapping boundaries.\n    if (webkit && options.lineWrapping &&\n        getComputedStyle(display.lineDiv).textRendering == \"optimizelegibility\")\n      { display.lineDiv.style.textRendering = \"auto\"; }\n  }\n\n  // The default configuration options.\n  CodeMirror.defaults = defaults;\n  // Functions to run when options are changed.\n  CodeMirror.optionHandlers = optionHandlers;\n\n  // Attach the necessary event handlers when initializing the editor\n  function registerEventHandlers(cm) {\n    var d = cm.display;\n    on(d.scroller, \"mousedown\", operation(cm, onMouseDown));\n    // Older IE's will not fire a second mousedown for a double click\n    if (ie && ie_version < 11)\n      { on(d.scroller, \"dblclick\", operation(cm, function (e) {\n        if (signalDOMEvent(cm, e)) { return }\n        var pos = posFromMouse(cm, e);\n        if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) { return }\n        e_preventDefault(e);\n        var word = cm.findWordAt(pos);\n        extendSelection(cm.doc, word.anchor, word.head);\n      })); }\n    else\n      { on(d.scroller, \"dblclick\", function (e) { return signalDOMEvent(cm, e) || e_preventDefault(e); }); }\n    // Some browsers fire contextmenu *after* opening the menu, at\n    // which point we can't mess with it anymore. Context menu is\n    // handled in onMouseDown for these browsers.\n    on(d.scroller, \"contextmenu\", function (e) { return onContextMenu(cm, e); });\n    on(d.input.getField(), \"contextmenu\", function (e) {\n      if (!d.scroller.contains(e.target)) { onContextMenu(cm, e); }\n    });\n\n    // Used to suppress mouse event handling when a touch happens\n    var touchFinished, prevTouch = {end: 0};\n    function finishTouch() {\n      if (d.activeTouch) {\n        touchFinished = setTimeout(function () { return d.activeTouch = null; }, 1000);\n        prevTouch = d.activeTouch;\n        prevTouch.end = +new Date;\n      }\n    }\n    function isMouseLikeTouchEvent(e) {\n      if (e.touches.length != 1) { return false }\n      var touch = e.touches[0];\n      return touch.radiusX <= 1 && touch.radiusY <= 1\n    }\n    function farAway(touch, other) {\n      if (other.left == null) { return true }\n      var dx = other.left - touch.left, dy = other.top - touch.top;\n      return dx * dx + dy * dy > 20 * 20\n    }\n    on(d.scroller, \"touchstart\", function (e) {\n      if (!signalDOMEvent(cm, e) && !isMouseLikeTouchEvent(e) && !clickInGutter(cm, e)) {\n        d.input.ensurePolled();\n        clearTimeout(touchFinished);\n        var now = +new Date;\n        d.activeTouch = {start: now, moved: false,\n                         prev: now - prevTouch.end <= 300 ? prevTouch : null};\n        if (e.touches.length == 1) {\n          d.activeTouch.left = e.touches[0].pageX;\n          d.activeTouch.top = e.touches[0].pageY;\n        }\n      }\n    });\n    on(d.scroller, \"touchmove\", function () {\n      if (d.activeTouch) { d.activeTouch.moved = true; }\n    });\n    on(d.scroller, \"touchend\", function (e) {\n      var touch = d.activeTouch;\n      if (touch && !eventInWidget(d, e) && touch.left != null &&\n          !touch.moved && new Date - touch.start < 300) {\n        var pos = cm.coordsChar(d.activeTouch, \"page\"), range;\n        if (!touch.prev || farAway(touch, touch.prev)) // Single tap\n          { range = new Range(pos, pos); }\n        else if (!touch.prev.prev || farAway(touch, touch.prev.prev)) // Double tap\n          { range = cm.findWordAt(pos); }\n        else // Triple tap\n          { range = new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0))); }\n        cm.setSelection(range.anchor, range.head);\n        cm.focus();\n        e_preventDefault(e);\n      }\n      finishTouch();\n    });\n    on(d.scroller, \"touchcancel\", finishTouch);\n\n    // Sync scrolling between fake scrollbars and real scrollable\n    // area, ensure viewport is updated when scrolling.\n    on(d.scroller, \"scroll\", function () {\n      if (d.scroller.clientHeight) {\n        updateScrollTop(cm, d.scroller.scrollTop);\n        setScrollLeft(cm, d.scroller.scrollLeft, true);\n        signal(cm, \"scroll\", cm);\n      }\n    });\n\n    // Listen to wheel events in order to try and update the viewport on time.\n    on(d.scroller, \"mousewheel\", function (e) { return onScrollWheel(cm, e); });\n    on(d.scroller, \"DOMMouseScroll\", function (e) { return onScrollWheel(cm, e); });\n\n    // Prevent wrapper from ever scrolling\n    on(d.wrapper, \"scroll\", function () { return d.wrapper.scrollTop = d.wrapper.scrollLeft = 0; });\n\n    d.dragFunctions = {\n      enter: function (e) {if (!signalDOMEvent(cm, e)) { e_stop(e); }},\n      over: function (e) {if (!signalDOMEvent(cm, e)) { onDragOver(cm, e); e_stop(e); }},\n      start: function (e) { return onDragStart(cm, e); },\n      drop: operation(cm, onDrop),\n      leave: function (e) {if (!signalDOMEvent(cm, e)) { clearDragCursor(cm); }}\n    };\n\n    var inp = d.input.getField();\n    on(inp, \"keyup\", function (e) { return onKeyUp.call(cm, e); });\n    on(inp, \"keydown\", operation(cm, onKeyDown));\n    on(inp, \"keypress\", operation(cm, onKeyPress));\n    on(inp, \"focus\", function (e) { return onFocus(cm, e); });\n    on(inp, \"blur\", function (e) { return onBlur(cm, e); });\n  }\n\n  var initHooks = [];\n  CodeMirror.defineInitHook = function (f) { return initHooks.push(f); };\n\n  // Indent the given line. The how parameter can be \"smart\",\n  // \"add\"/null, \"subtract\", or \"prev\". When aggressive is false\n  // (typically set to true for forced single-line indents), empty\n  // lines are not indented, and places where the mode returns Pass\n  // are left alone.\n  function indentLine(cm, n, how, aggressive) {\n    var doc = cm.doc, state;\n    if (how == null) { how = \"add\"; }\n    if (how == \"smart\") {\n      // Fall back to \"prev\" when the mode doesn't have an indentation\n      // method.\n      if (!doc.mode.indent) { how = \"prev\"; }\n      else { state = getContextBefore(cm, n).state; }\n    }\n\n    var tabSize = cm.options.tabSize;\n    var line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize);\n    if (line.stateAfter) { line.stateAfter = null; }\n    var curSpaceString = line.text.match(/^\\s*/)[0], indentation;\n    if (!aggressive && !/\\S/.test(line.text)) {\n      indentation = 0;\n      how = \"not\";\n    } else if (how == \"smart\") {\n      indentation = doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text);\n      if (indentation == Pass || indentation > 150) {\n        if (!aggressive) { return }\n        how = \"prev\";\n      }\n    }\n    if (how == \"prev\") {\n      if (n > doc.first) { indentation = countColumn(getLine(doc, n-1).text, null, tabSize); }\n      else { indentation = 0; }\n    } else if (how == \"add\") {\n      indentation = curSpace + cm.options.indentUnit;\n    } else if (how == \"subtract\") {\n      indentation = curSpace - cm.options.indentUnit;\n    } else if (typeof how == \"number\") {\n      indentation = curSpace + how;\n    }\n    indentation = Math.max(0, indentation);\n\n    var indentString = \"\", pos = 0;\n    if (cm.options.indentWithTabs)\n      { for (var i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += \"\\t\";} }\n    if (pos < indentation) { indentString += spaceStr(indentation - pos); }\n\n    if (indentString != curSpaceString) {\n      replaceRange(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), \"+input\");\n      line.stateAfter = null;\n      return true\n    } else {\n      // Ensure that, if the cursor was in the whitespace at the start\n      // of the line, it is moved to the end of that space.\n      for (var i$1 = 0; i$1 < doc.sel.ranges.length; i$1++) {\n        var range = doc.sel.ranges[i$1];\n        if (range.head.line == n && range.head.ch < curSpaceString.length) {\n          var pos$1 = Pos(n, curSpaceString.length);\n          replaceOneSelection(doc, i$1, new Range(pos$1, pos$1));\n          break\n        }\n      }\n    }\n  }\n\n  // This will be set to a {lineWise: bool, text: [string]} object, so\n  // that, when pasting, we know what kind of selections the copied\n  // text was made out of.\n  var lastCopied = null;\n\n  function setLastCopied(newLastCopied) {\n    lastCopied = newLastCopied;\n  }\n\n  function applyTextInput(cm, inserted, deleted, sel, origin) {\n    var doc = cm.doc;\n    cm.display.shift = false;\n    if (!sel) { sel = doc.sel; }\n\n    var recent = +new Date - 200;\n    var paste = origin == \"paste\" || cm.state.pasteIncoming > recent;\n    var textLines = splitLinesAuto(inserted), multiPaste = null;\n    // When pasting N lines into N selections, insert one line per selection\n    if (paste && sel.ranges.length > 1) {\n      if (lastCopied && lastCopied.text.join(\"\\n\") == inserted) {\n        if (sel.ranges.length % lastCopied.text.length == 0) {\n          multiPaste = [];\n          for (var i = 0; i < lastCopied.text.length; i++)\n            { multiPaste.push(doc.splitLines(lastCopied.text[i])); }\n        }\n      } else if (textLines.length == sel.ranges.length && cm.options.pasteLinesPerSelection) {\n        multiPaste = map(textLines, function (l) { return [l]; });\n      }\n    }\n\n    var updateInput = cm.curOp.updateInput;\n    // Normal behavior is to insert the new text into every selection\n    for (var i$1 = sel.ranges.length - 1; i$1 >= 0; i$1--) {\n      var range = sel.ranges[i$1];\n      var from = range.from(), to = range.to();\n      if (range.empty()) {\n        if (deleted && deleted > 0) // Handle deletion\n          { from = Pos(from.line, from.ch - deleted); }\n        else if (cm.state.overwrite && !paste) // Handle overwrite\n          { to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length)); }\n        else if (paste && lastCopied && lastCopied.lineWise && lastCopied.text.join(\"\\n\") == inserted)\n          { from = to = Pos(from.line, 0); }\n      }\n      var changeEvent = {from: from, to: to, text: multiPaste ? multiPaste[i$1 % multiPaste.length] : textLines,\n                         origin: origin || (paste ? \"paste\" : cm.state.cutIncoming > recent ? \"cut\" : \"+input\")};\n      makeChange(cm.doc, changeEvent);\n      signalLater(cm, \"inputRead\", cm, changeEvent);\n    }\n    if (inserted && !paste)\n      { triggerElectric(cm, inserted); }\n\n    ensureCursorVisible(cm);\n    if (cm.curOp.updateInput < 2) { cm.curOp.updateInput = updateInput; }\n    cm.curOp.typing = true;\n    cm.state.pasteIncoming = cm.state.cutIncoming = -1;\n  }\n\n  function handlePaste(e, cm) {\n    var pasted = e.clipboardData && e.clipboardData.getData(\"Text\");\n    if (pasted) {\n      e.preventDefault();\n      if (!cm.isReadOnly() && !cm.options.disableInput)\n        { runInOp(cm, function () { return applyTextInput(cm, pasted, 0, null, \"paste\"); }); }\n      return true\n    }\n  }\n\n  function triggerElectric(cm, inserted) {\n    // When an 'electric' character is inserted, immediately trigger a reindent\n    if (!cm.options.electricChars || !cm.options.smartIndent) { return }\n    var sel = cm.doc.sel;\n\n    for (var i = sel.ranges.length - 1; i >= 0; i--) {\n      var range = sel.ranges[i];\n      if (range.head.ch > 100 || (i && sel.ranges[i - 1].head.line == range.head.line)) { continue }\n      var mode = cm.getModeAt(range.head);\n      var indented = false;\n      if (mode.electricChars) {\n        for (var j = 0; j < mode.electricChars.length; j++)\n          { if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {\n            indented = indentLine(cm, range.head.line, \"smart\");\n            break\n          } }\n      } else if (mode.electricInput) {\n        if (mode.electricInput.test(getLine(cm.doc, range.head.line).text.slice(0, range.head.ch)))\n          { indented = indentLine(cm, range.head.line, \"smart\"); }\n      }\n      if (indented) { signalLater(cm, \"electricInput\", cm, range.head.line); }\n    }\n  }\n\n  function copyableRanges(cm) {\n    var text = [], ranges = [];\n    for (var i = 0; i < cm.doc.sel.ranges.length; i++) {\n      var line = cm.doc.sel.ranges[i].head.line;\n      var lineRange = {anchor: Pos(line, 0), head: Pos(line + 1, 0)};\n      ranges.push(lineRange);\n      text.push(cm.getRange(lineRange.anchor, lineRange.head));\n    }\n    return {text: text, ranges: ranges}\n  }\n\n  function disableBrowserMagic(field, spellcheck, autocorrect, autocapitalize) {\n    field.setAttribute(\"autocorrect\", autocorrect ? \"\" : \"off\");\n    field.setAttribute(\"autocapitalize\", autocapitalize ? \"\" : \"off\");\n    field.setAttribute(\"spellcheck\", !!spellcheck);\n  }\n\n  function hiddenTextarea() {\n    var te = elt(\"textarea\", null, null, \"position: absolute; bottom: -1em; padding: 0; width: 1px; height: 1em; outline: none\");\n    var div = elt(\"div\", [te], null, \"overflow: hidden; position: relative; width: 3px; height: 0px;\");\n    // The textarea is kept positioned near the cursor to prevent the\n    // fact that it'll be scrolled into view on input from scrolling\n    // our fake cursor out of view. On webkit, when wrap=off, paste is\n    // very slow. So make the area wide instead.\n    if (webkit) { te.style.width = \"1000px\"; }\n    else { te.setAttribute(\"wrap\", \"off\"); }\n    // If border: 0; -- iOS fails to open keyboard (issue #1287)\n    if (ios) { te.style.border = \"1px solid black\"; }\n    disableBrowserMagic(te);\n    return div\n  }\n\n  // The publicly visible API. Note that methodOp(f) means\n  // 'wrap f in an operation, performed on its `this` parameter'.\n\n  // This is not the complete set of editor methods. Most of the\n  // methods defined on the Doc type are also injected into\n  // CodeMirror.prototype, for backwards compatibility and\n  // convenience.\n\n  function addEditorMethods(CodeMirror) {\n    var optionHandlers = CodeMirror.optionHandlers;\n\n    var helpers = CodeMirror.helpers = {};\n\n    CodeMirror.prototype = {\n      constructor: CodeMirror,\n      focus: function(){window.focus(); this.display.input.focus();},\n\n      setOption: function(option, value) {\n        var options = this.options, old = options[option];\n        if (options[option] == value && option != \"mode\") { return }\n        options[option] = value;\n        if (optionHandlers.hasOwnProperty(option))\n          { operation(this, optionHandlers[option])(this, value, old); }\n        signal(this, \"optionChange\", this, option);\n      },\n\n      getOption: function(option) {return this.options[option]},\n      getDoc: function() {return this.doc},\n\n      addKeyMap: function(map, bottom) {\n        this.state.keyMaps[bottom ? \"push\" : \"unshift\"](getKeyMap(map));\n      },\n      removeKeyMap: function(map) {\n        var maps = this.state.keyMaps;\n        for (var i = 0; i < maps.length; ++i)\n          { if (maps[i] == map || maps[i].name == map) {\n            maps.splice(i, 1);\n            return true\n          } }\n      },\n\n      addOverlay: methodOp(function(spec, options) {\n        var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec);\n        if (mode.startState) { throw new Error(\"Overlays may not be stateful.\") }\n        insertSorted(this.state.overlays,\n                     {mode: mode, modeSpec: spec, opaque: options && options.opaque,\n                      priority: (options && options.priority) || 0},\n                     function (overlay) { return overlay.priority; });\n        this.state.modeGen++;\n        regChange(this);\n      }),\n      removeOverlay: methodOp(function(spec) {\n        var overlays = this.state.overlays;\n        for (var i = 0; i < overlays.length; ++i) {\n          var cur = overlays[i].modeSpec;\n          if (cur == spec || typeof spec == \"string\" && cur.name == spec) {\n            overlays.splice(i, 1);\n            this.state.modeGen++;\n            regChange(this);\n            return\n          }\n        }\n      }),\n\n      indentLine: methodOp(function(n, dir, aggressive) {\n        if (typeof dir != \"string\" && typeof dir != \"number\") {\n          if (dir == null) { dir = this.options.smartIndent ? \"smart\" : \"prev\"; }\n          else { dir = dir ? \"add\" : \"subtract\"; }\n        }\n        if (isLine(this.doc, n)) { indentLine(this, n, dir, aggressive); }\n      }),\n      indentSelection: methodOp(function(how) {\n        var ranges = this.doc.sel.ranges, end = -1;\n        for (var i = 0; i < ranges.length; i++) {\n          var range = ranges[i];\n          if (!range.empty()) {\n            var from = range.from(), to = range.to();\n            var start = Math.max(end, from.line);\n            end = Math.min(this.lastLine(), to.line - (to.ch ? 0 : 1)) + 1;\n            for (var j = start; j < end; ++j)\n              { indentLine(this, j, how); }\n            var newRanges = this.doc.sel.ranges;\n            if (from.ch == 0 && ranges.length == newRanges.length && newRanges[i].from().ch > 0)\n              { replaceOneSelection(this.doc, i, new Range(from, newRanges[i].to()), sel_dontScroll); }\n          } else if (range.head.line > end) {\n            indentLine(this, range.head.line, how, true);\n            end = range.head.line;\n            if (i == this.doc.sel.primIndex) { ensureCursorVisible(this); }\n          }\n        }\n      }),\n\n      // Fetch the parser token for a given character. Useful for hacks\n      // that want to inspect the mode state (say, for completion).\n      getTokenAt: function(pos, precise) {\n        return takeToken(this, pos, precise)\n      },\n\n      getLineTokens: function(line, precise) {\n        return takeToken(this, Pos(line), precise, true)\n      },\n\n      getTokenTypeAt: function(pos) {\n        pos = clipPos(this.doc, pos);\n        var styles = getLineStyles(this, getLine(this.doc, pos.line));\n        var before = 0, after = (styles.length - 1) / 2, ch = pos.ch;\n        var type;\n        if (ch == 0) { type = styles[2]; }\n        else { for (;;) {\n          var mid = (before + after) >> 1;\n          if ((mid ? styles[mid * 2 - 1] : 0) >= ch) { after = mid; }\n          else if (styles[mid * 2 + 1] < ch) { before = mid + 1; }\n          else { type = styles[mid * 2 + 2]; break }\n        } }\n        var cut = type ? type.indexOf(\"overlay \") : -1;\n        return cut < 0 ? type : cut == 0 ? null : type.slice(0, cut - 1)\n      },\n\n      getModeAt: function(pos) {\n        var mode = this.doc.mode;\n        if (!mode.innerMode) { return mode }\n        return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode\n      },\n\n      getHelper: function(pos, type) {\n        return this.getHelpers(pos, type)[0]\n      },\n\n      getHelpers: function(pos, type) {\n        var found = [];\n        if (!helpers.hasOwnProperty(type)) { return found }\n        var help = helpers[type], mode = this.getModeAt(pos);\n        if (typeof mode[type] == \"string\") {\n          if (help[mode[type]]) { found.push(help[mode[type]]); }\n        } else if (mode[type]) {\n          for (var i = 0; i < mode[type].length; i++) {\n            var val = help[mode[type][i]];\n            if (val) { found.push(val); }\n          }\n        } else if (mode.helperType && help[mode.helperType]) {\n          found.push(help[mode.helperType]);\n        } else if (help[mode.name]) {\n          found.push(help[mode.name]);\n        }\n        for (var i$1 = 0; i$1 < help._global.length; i$1++) {\n          var cur = help._global[i$1];\n          if (cur.pred(mode, this) && indexOf(found, cur.val) == -1)\n            { found.push(cur.val); }\n        }\n        return found\n      },\n\n      getStateAfter: function(line, precise) {\n        var doc = this.doc;\n        line = clipLine(doc, line == null ? doc.first + doc.size - 1: line);\n        return getContextBefore(this, line + 1, precise).state\n      },\n\n      cursorCoords: function(start, mode) {\n        var pos, range = this.doc.sel.primary();\n        if (start == null) { pos = range.head; }\n        else if (typeof start == \"object\") { pos = clipPos(this.doc, start); }\n        else { pos = start ? range.from() : range.to(); }\n        return cursorCoords(this, pos, mode || \"page\")\n      },\n\n      charCoords: function(pos, mode) {\n        return charCoords(this, clipPos(this.doc, pos), mode || \"page\")\n      },\n\n      coordsChar: function(coords, mode) {\n        coords = fromCoordSystem(this, coords, mode || \"page\");\n        return coordsChar(this, coords.left, coords.top)\n      },\n\n      lineAtHeight: function(height, mode) {\n        height = fromCoordSystem(this, {top: height, left: 0}, mode || \"page\").top;\n        return lineAtHeight(this.doc, height + this.display.viewOffset)\n      },\n      heightAtLine: function(line, mode, includeWidgets) {\n        var end = false, lineObj;\n        if (typeof line == \"number\") {\n          var last = this.doc.first + this.doc.size - 1;\n          if (line < this.doc.first) { line = this.doc.first; }\n          else if (line > last) { line = last; end = true; }\n          lineObj = getLine(this.doc, line);\n        } else {\n          lineObj = line;\n        }\n        return intoCoordSystem(this, lineObj, {top: 0, left: 0}, mode || \"page\", includeWidgets || end).top +\n          (end ? this.doc.height - heightAtLine(lineObj) : 0)\n      },\n\n      defaultTextHeight: function() { return textHeight(this.display) },\n      defaultCharWidth: function() { return charWidth(this.display) },\n\n      getViewport: function() { return {from: this.display.viewFrom, to: this.display.viewTo}},\n\n      addWidget: function(pos, node, scroll, vert, horiz) {\n        var display = this.display;\n        pos = cursorCoords(this, clipPos(this.doc, pos));\n        var top = pos.bottom, left = pos.left;\n        node.style.position = \"absolute\";\n        node.setAttribute(\"cm-ignore-events\", \"true\");\n        this.display.input.setUneditable(node);\n        display.sizer.appendChild(node);\n        if (vert == \"over\") {\n          top = pos.top;\n        } else if (vert == \"above\" || vert == \"near\") {\n          var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),\n          hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth);\n          // Default to positioning above (if specified and possible); otherwise default to positioning below\n          if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight)\n            { top = pos.top - node.offsetHeight; }\n          else if (pos.bottom + node.offsetHeight <= vspace)\n            { top = pos.bottom; }\n          if (left + node.offsetWidth > hspace)\n            { left = hspace - node.offsetWidth; }\n        }\n        node.style.top = top + \"px\";\n        node.style.left = node.style.right = \"\";\n        if (horiz == \"right\") {\n          left = display.sizer.clientWidth - node.offsetWidth;\n          node.style.right = \"0px\";\n        } else {\n          if (horiz == \"left\") { left = 0; }\n          else if (horiz == \"middle\") { left = (display.sizer.clientWidth - node.offsetWidth) / 2; }\n          node.style.left = left + \"px\";\n        }\n        if (scroll)\n          { scrollIntoView(this, {left: left, top: top, right: left + node.offsetWidth, bottom: top + node.offsetHeight}); }\n      },\n\n      triggerOnKeyDown: methodOp(onKeyDown),\n      triggerOnKeyPress: methodOp(onKeyPress),\n      triggerOnKeyUp: onKeyUp,\n      triggerOnMouseDown: methodOp(onMouseDown),\n\n      execCommand: function(cmd) {\n        if (commands.hasOwnProperty(cmd))\n          { return commands[cmd].call(null, this) }\n      },\n\n      triggerElectric: methodOp(function(text) { triggerElectric(this, text); }),\n\n      findPosH: function(from, amount, unit, visually) {\n        var dir = 1;\n        if (amount < 0) { dir = -1; amount = -amount; }\n        var cur = clipPos(this.doc, from);\n        for (var i = 0; i < amount; ++i) {\n          cur = findPosH(this.doc, cur, dir, unit, visually);\n          if (cur.hitSide) { break }\n        }\n        return cur\n      },\n\n      moveH: methodOp(function(dir, unit) {\n        var this$1 = this;\n\n        this.extendSelectionsBy(function (range) {\n          if (this$1.display.shift || this$1.doc.extend || range.empty())\n            { return findPosH(this$1.doc, range.head, dir, unit, this$1.options.rtlMoveVisually) }\n          else\n            { return dir < 0 ? range.from() : range.to() }\n        }, sel_move);\n      }),\n\n      deleteH: methodOp(function(dir, unit) {\n        var sel = this.doc.sel, doc = this.doc;\n        if (sel.somethingSelected())\n          { doc.replaceSelection(\"\", null, \"+delete\"); }\n        else\n          { deleteNearSelection(this, function (range) {\n            var other = findPosH(doc, range.head, dir, unit, false);\n            return dir < 0 ? {from: other, to: range.head} : {from: range.head, to: other}\n          }); }\n      }),\n\n      findPosV: function(from, amount, unit, goalColumn) {\n        var dir = 1, x = goalColumn;\n        if (amount < 0) { dir = -1; amount = -amount; }\n        var cur = clipPos(this.doc, from);\n        for (var i = 0; i < amount; ++i) {\n          var coords = cursorCoords(this, cur, \"div\");\n          if (x == null) { x = coords.left; }\n          else { coords.left = x; }\n          cur = findPosV(this, coords, dir, unit);\n          if (cur.hitSide) { break }\n        }\n        return cur\n      },\n\n      moveV: methodOp(function(dir, unit) {\n        var this$1 = this;\n\n        var doc = this.doc, goals = [];\n        var collapse = !this.display.shift && !doc.extend && doc.sel.somethingSelected();\n        doc.extendSelectionsBy(function (range) {\n          if (collapse)\n            { return dir < 0 ? range.from() : range.to() }\n          var headPos = cursorCoords(this$1, range.head, \"div\");\n          if (range.goalColumn != null) { headPos.left = range.goalColumn; }\n          goals.push(headPos.left);\n          var pos = findPosV(this$1, headPos, dir, unit);\n          if (unit == \"page\" && range == doc.sel.primary())\n            { addToScrollTop(this$1, charCoords(this$1, pos, \"div\").top - headPos.top); }\n          return pos\n        }, sel_move);\n        if (goals.length) { for (var i = 0; i < doc.sel.ranges.length; i++)\n          { doc.sel.ranges[i].goalColumn = goals[i]; } }\n      }),\n\n      // Find the word at the given position (as returned by coordsChar).\n      findWordAt: function(pos) {\n        var doc = this.doc, line = getLine(doc, pos.line).text;\n        var start = pos.ch, end = pos.ch;\n        if (line) {\n          var helper = this.getHelper(pos, \"wordChars\");\n          if ((pos.sticky == \"before\" || end == line.length) && start) { --start; } else { ++end; }\n          var startChar = line.charAt(start);\n          var check = isWordChar(startChar, helper)\n            ? function (ch) { return isWordChar(ch, helper); }\n            : /\\s/.test(startChar) ? function (ch) { return /\\s/.test(ch); }\n            : function (ch) { return (!/\\s/.test(ch) && !isWordChar(ch)); };\n          while (start > 0 && check(line.charAt(start - 1))) { --start; }\n          while (end < line.length && check(line.charAt(end))) { ++end; }\n        }\n        return new Range(Pos(pos.line, start), Pos(pos.line, end))\n      },\n\n      toggleOverwrite: function(value) {\n        if (value != null && value == this.state.overwrite) { return }\n        if (this.state.overwrite = !this.state.overwrite)\n          { addClass(this.display.cursorDiv, \"CodeMirror-overwrite\"); }\n        else\n          { rmClass(this.display.cursorDiv, \"CodeMirror-overwrite\"); }\n\n        signal(this, \"overwriteToggle\", this, this.state.overwrite);\n      },\n      hasFocus: function() { return this.display.input.getField() == activeElt() },\n      isReadOnly: function() { return !!(this.options.readOnly || this.doc.cantEdit) },\n\n      scrollTo: methodOp(function (x, y) { scrollToCoords(this, x, y); }),\n      getScrollInfo: function() {\n        var scroller = this.display.scroller;\n        return {left: scroller.scrollLeft, top: scroller.scrollTop,\n                height: scroller.scrollHeight - scrollGap(this) - this.display.barHeight,\n                width: scroller.scrollWidth - scrollGap(this) - this.display.barWidth,\n                clientHeight: displayHeight(this), clientWidth: displayWidth(this)}\n      },\n\n      scrollIntoView: methodOp(function(range, margin) {\n        if (range == null) {\n          range = {from: this.doc.sel.primary().head, to: null};\n          if (margin == null) { margin = this.options.cursorScrollMargin; }\n        } else if (typeof range == \"number\") {\n          range = {from: Pos(range, 0), to: null};\n        } else if (range.from == null) {\n          range = {from: range, to: null};\n        }\n        if (!range.to) { range.to = range.from; }\n        range.margin = margin || 0;\n\n        if (range.from.line != null) {\n          scrollToRange(this, range);\n        } else {\n          scrollToCoordsRange(this, range.from, range.to, range.margin);\n        }\n      }),\n\n      setSize: methodOp(function(width, height) {\n        var this$1 = this;\n\n        var interpret = function (val) { return typeof val == \"number\" || /^\\d+$/.test(String(val)) ? val + \"px\" : val; };\n        if (width != null) { this.display.wrapper.style.width = interpret(width); }\n        if (height != null) { this.display.wrapper.style.height = interpret(height); }\n        if (this.options.lineWrapping) { clearLineMeasurementCache(this); }\n        var lineNo = this.display.viewFrom;\n        this.doc.iter(lineNo, this.display.viewTo, function (line) {\n          if (line.widgets) { for (var i = 0; i < line.widgets.length; i++)\n            { if (line.widgets[i].noHScroll) { regLineChange(this$1, lineNo, \"widget\"); break } } }\n          ++lineNo;\n        });\n        this.curOp.forceUpdate = true;\n        signal(this, \"refresh\", this);\n      }),\n\n      operation: function(f){return runInOp(this, f)},\n      startOperation: function(){return startOperation(this)},\n      endOperation: function(){return endOperation(this)},\n\n      refresh: methodOp(function() {\n        var oldHeight = this.display.cachedTextHeight;\n        regChange(this);\n        this.curOp.forceUpdate = true;\n        clearCaches(this);\n        scrollToCoords(this, this.doc.scrollLeft, this.doc.scrollTop);\n        updateGutterSpace(this.display);\n        if (oldHeight == null || Math.abs(oldHeight - textHeight(this.display)) > .5 || this.options.lineWrapping)\n          { estimateLineHeights(this); }\n        signal(this, \"refresh\", this);\n      }),\n\n      swapDoc: methodOp(function(doc) {\n        var old = this.doc;\n        old.cm = null;\n        // Cancel the current text selection if any (#5821)\n        if (this.state.selectingText) { this.state.selectingText(); }\n        attachDoc(this, doc);\n        clearCaches(this);\n        this.display.input.reset();\n        scrollToCoords(this, doc.scrollLeft, doc.scrollTop);\n        this.curOp.forceScroll = true;\n        signalLater(this, \"swapDoc\", this, old);\n        return old\n      }),\n\n      phrase: function(phraseText) {\n        var phrases = this.options.phrases;\n        return phrases && Object.prototype.hasOwnProperty.call(phrases, phraseText) ? phrases[phraseText] : phraseText\n      },\n\n      getInputField: function(){return this.display.input.getField()},\n      getWrapperElement: function(){return this.display.wrapper},\n      getScrollerElement: function(){return this.display.scroller},\n      getGutterElement: function(){return this.display.gutters}\n    };\n    eventMixin(CodeMirror);\n\n    CodeMirror.registerHelper = function(type, name, value) {\n      if (!helpers.hasOwnProperty(type)) { helpers[type] = CodeMirror[type] = {_global: []}; }\n      helpers[type][name] = value;\n    };\n    CodeMirror.registerGlobalHelper = function(type, name, predicate, value) {\n      CodeMirror.registerHelper(type, name, value);\n      helpers[type]._global.push({pred: predicate, val: value});\n    };\n  }\n\n  // Used for horizontal relative motion. Dir is -1 or 1 (left or\n  // right), unit can be \"char\", \"column\" (like char, but doesn't\n  // cross line boundaries), \"word\" (across next word), or \"group\" (to\n  // the start of next group of word or non-word-non-whitespace\n  // chars). The visually param controls whether, in right-to-left\n  // text, direction 1 means to move towards the next index in the\n  // string, or towards the character to the right of the current\n  // position. The resulting position will have a hitSide=true\n  // property if it reached the end of the document.\n  function findPosH(doc, pos, dir, unit, visually) {\n    var oldPos = pos;\n    var origDir = dir;\n    var lineObj = getLine(doc, pos.line);\n    var lineDir = visually && doc.direction == \"rtl\" ? -dir : dir;\n    function findNextLine() {\n      var l = pos.line + lineDir;\n      if (l < doc.first || l >= doc.first + doc.size) { return false }\n      pos = new Pos(l, pos.ch, pos.sticky);\n      return lineObj = getLine(doc, l)\n    }\n    function moveOnce(boundToLine) {\n      var next;\n      if (visually) {\n        next = moveVisually(doc.cm, lineObj, pos, dir);\n      } else {\n        next = moveLogically(lineObj, pos, dir);\n      }\n      if (next == null) {\n        if (!boundToLine && findNextLine())\n          { pos = endOfLine(visually, doc.cm, lineObj, pos.line, lineDir); }\n        else\n          { return false }\n      } else {\n        pos = next;\n      }\n      return true\n    }\n\n    if (unit == \"char\") {\n      moveOnce();\n    } else if (unit == \"column\") {\n      moveOnce(true);\n    } else if (unit == \"word\" || unit == \"group\") {\n      var sawType = null, group = unit == \"group\";\n      var helper = doc.cm && doc.cm.getHelper(pos, \"wordChars\");\n      for (var first = true;; first = false) {\n        if (dir < 0 && !moveOnce(!first)) { break }\n        var cur = lineObj.text.charAt(pos.ch) || \"\\n\";\n        var type = isWordChar(cur, helper) ? \"w\"\n          : group && cur == \"\\n\" ? \"n\"\n          : !group || /\\s/.test(cur) ? null\n          : \"p\";\n        if (group && !first && !type) { type = \"s\"; }\n        if (sawType && sawType != type) {\n          if (dir < 0) {dir = 1; moveOnce(); pos.sticky = \"after\";}\n          break\n        }\n\n        if (type) { sawType = type; }\n        if (dir > 0 && !moveOnce(!first)) { break }\n      }\n    }\n    var result = skipAtomic(doc, pos, oldPos, origDir, true);\n    if (equalCursorPos(oldPos, result)) { result.hitSide = true; }\n    return result\n  }\n\n  // For relative vertical movement. Dir may be -1 or 1. Unit can be\n  // \"page\" or \"line\". The resulting position will have a hitSide=true\n  // property if it reached the end of the document.\n  function findPosV(cm, pos, dir, unit) {\n    var doc = cm.doc, x = pos.left, y;\n    if (unit == \"page\") {\n      var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight);\n      var moveAmount = Math.max(pageSize - .5 * textHeight(cm.display), 3);\n      y = (dir > 0 ? pos.bottom : pos.top) + dir * moveAmount;\n\n    } else if (unit == \"line\") {\n      y = dir > 0 ? pos.bottom + 3 : pos.top - 3;\n    }\n    var target;\n    for (;;) {\n      target = coordsChar(cm, x, y);\n      if (!target.outside) { break }\n      if (dir < 0 ? y <= 0 : y >= doc.height) { target.hitSide = true; break }\n      y += dir * 5;\n    }\n    return target\n  }\n\n  // CONTENTEDITABLE INPUT STYLE\n\n  var ContentEditableInput = function(cm) {\n    this.cm = cm;\n    this.lastAnchorNode = this.lastAnchorOffset = this.lastFocusNode = this.lastFocusOffset = null;\n    this.polling = new Delayed();\n    this.composing = null;\n    this.gracePeriod = false;\n    this.readDOMTimeout = null;\n  };\n\n  ContentEditableInput.prototype.init = function (display) {\n      var this$1 = this;\n\n    var input = this, cm = input.cm;\n    var div = input.div = display.lineDiv;\n    disableBrowserMagic(div, cm.options.spellcheck, cm.options.autocorrect, cm.options.autocapitalize);\n\n    function belongsToInput(e) {\n      for (var t = e.target; t; t = t.parentNode) {\n        if (t == div) { return true }\n        if (/\\bCodeMirror-(?:line)?widget\\b/.test(t.className)) { break }\n      }\n      return false\n    }\n\n    on(div, \"paste\", function (e) {\n      if (!belongsToInput(e) || signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }\n      // IE doesn't fire input events, so we schedule a read for the pasted content in this way\n      if (ie_version <= 11) { setTimeout(operation(cm, function () { return this$1.updateFromDOM(); }), 20); }\n    });\n\n    on(div, \"compositionstart\", function (e) {\n      this$1.composing = {data: e.data, done: false};\n    });\n    on(div, \"compositionupdate\", function (e) {\n      if (!this$1.composing) { this$1.composing = {data: e.data, done: false}; }\n    });\n    on(div, \"compositionend\", function (e) {\n      if (this$1.composing) {\n        if (e.data != this$1.composing.data) { this$1.readFromDOMSoon(); }\n        this$1.composing.done = true;\n      }\n    });\n\n    on(div, \"touchstart\", function () { return input.forceCompositionEnd(); });\n\n    on(div, \"input\", function () {\n      if (!this$1.composing) { this$1.readFromDOMSoon(); }\n    });\n\n    function onCopyCut(e) {\n      if (!belongsToInput(e) || signalDOMEvent(cm, e)) { return }\n      if (cm.somethingSelected()) {\n        setLastCopied({lineWise: false, text: cm.getSelections()});\n        if (e.type == \"cut\") { cm.replaceSelection(\"\", null, \"cut\"); }\n      } else if (!cm.options.lineWiseCopyCut) {\n        return\n      } else {\n        var ranges = copyableRanges(cm);\n        setLastCopied({lineWise: true, text: ranges.text});\n        if (e.type == \"cut\") {\n          cm.operation(function () {\n            cm.setSelections(ranges.ranges, 0, sel_dontScroll);\n            cm.replaceSelection(\"\", null, \"cut\");\n          });\n        }\n      }\n      if (e.clipboardData) {\n        e.clipboardData.clearData();\n        var content = lastCopied.text.join(\"\\n\");\n        // iOS exposes the clipboard API, but seems to discard content inserted into it\n        e.clipboardData.setData(\"Text\", content);\n        if (e.clipboardData.getData(\"Text\") == content) {\n          e.preventDefault();\n          return\n        }\n      }\n      // Old-fashioned briefly-focus-a-textarea hack\n      var kludge = hiddenTextarea(), te = kludge.firstChild;\n      cm.display.lineSpace.insertBefore(kludge, cm.display.lineSpace.firstChild);\n      te.value = lastCopied.text.join(\"\\n\");\n      var hadFocus = document.activeElement;\n      selectInput(te);\n      setTimeout(function () {\n        cm.display.lineSpace.removeChild(kludge);\n        hadFocus.focus();\n        if (hadFocus == div) { input.showPrimarySelection(); }\n      }, 50);\n    }\n    on(div, \"copy\", onCopyCut);\n    on(div, \"cut\", onCopyCut);\n  };\n\n  ContentEditableInput.prototype.screenReaderLabelChanged = function (label) {\n    // Label for screenreaders, accessibility\n    if(label) {\n      this.div.setAttribute('aria-label', label);\n    } else {\n      this.div.removeAttribute('aria-label');\n    }\n  };\n\n  ContentEditableInput.prototype.prepareSelection = function () {\n    var result = prepareSelection(this.cm, false);\n    result.focus = document.activeElement == this.div;\n    return result\n  };\n\n  ContentEditableInput.prototype.showSelection = function (info, takeFocus) {\n    if (!info || !this.cm.display.view.length) { return }\n    if (info.focus || takeFocus) { this.showPrimarySelection(); }\n    this.showMultipleSelections(info);\n  };\n\n  ContentEditableInput.prototype.getSelection = function () {\n    return this.cm.display.wrapper.ownerDocument.getSelection()\n  };\n\n  ContentEditableInput.prototype.showPrimarySelection = function () {\n    var sel = this.getSelection(), cm = this.cm, prim = cm.doc.sel.primary();\n    var from = prim.from(), to = prim.to();\n\n    if (cm.display.viewTo == cm.display.viewFrom || from.line >= cm.display.viewTo || to.line < cm.display.viewFrom) {\n      sel.removeAllRanges();\n      return\n    }\n\n    var curAnchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);\n    var curFocus = domToPos(cm, sel.focusNode, sel.focusOffset);\n    if (curAnchor && !curAnchor.bad && curFocus && !curFocus.bad &&\n        cmp(minPos(curAnchor, curFocus), from) == 0 &&\n        cmp(maxPos(curAnchor, curFocus), to) == 0)\n      { return }\n\n    var view = cm.display.view;\n    var start = (from.line >= cm.display.viewFrom && posToDOM(cm, from)) ||\n        {node: view[0].measure.map[2], offset: 0};\n    var end = to.line < cm.display.viewTo && posToDOM(cm, to);\n    if (!end) {\n      var measure = view[view.length - 1].measure;\n      var map = measure.maps ? measure.maps[measure.maps.length - 1] : measure.map;\n      end = {node: map[map.length - 1], offset: map[map.length - 2] - map[map.length - 3]};\n    }\n\n    if (!start || !end) {\n      sel.removeAllRanges();\n      return\n    }\n\n    var old = sel.rangeCount && sel.getRangeAt(0), rng;\n    try { rng = range(start.node, start.offset, end.offset, end.node); }\n    catch(e) {} // Our model of the DOM might be outdated, in which case the range we try to set can be impossible\n    if (rng) {\n      if (!gecko && cm.state.focused) {\n        sel.collapse(start.node, start.offset);\n        if (!rng.collapsed) {\n          sel.removeAllRanges();\n          sel.addRange(rng);\n        }\n      } else {\n        sel.removeAllRanges();\n        sel.addRange(rng);\n      }\n      if (old && sel.anchorNode == null) { sel.addRange(old); }\n      else if (gecko) { this.startGracePeriod(); }\n    }\n    this.rememberSelection();\n  };\n\n  ContentEditableInput.prototype.startGracePeriod = function () {\n      var this$1 = this;\n\n    clearTimeout(this.gracePeriod);\n    this.gracePeriod = setTimeout(function () {\n      this$1.gracePeriod = false;\n      if (this$1.selectionChanged())\n        { this$1.cm.operation(function () { return this$1.cm.curOp.selectionChanged = true; }); }\n    }, 20);\n  };\n\n  ContentEditableInput.prototype.showMultipleSelections = function (info) {\n    removeChildrenAndAdd(this.cm.display.cursorDiv, info.cursors);\n    removeChildrenAndAdd(this.cm.display.selectionDiv, info.selection);\n  };\n\n  ContentEditableInput.prototype.rememberSelection = function () {\n    var sel = this.getSelection();\n    this.lastAnchorNode = sel.anchorNode; this.lastAnchorOffset = sel.anchorOffset;\n    this.lastFocusNode = sel.focusNode; this.lastFocusOffset = sel.focusOffset;\n  };\n\n  ContentEditableInput.prototype.selectionInEditor = function () {\n    var sel = this.getSelection();\n    if (!sel.rangeCount) { return false }\n    var node = sel.getRangeAt(0).commonAncestorContainer;\n    return contains(this.div, node)\n  };\n\n  ContentEditableInput.prototype.focus = function () {\n    if (this.cm.options.readOnly != \"nocursor\") {\n      if (!this.selectionInEditor() || document.activeElement != this.div)\n        { this.showSelection(this.prepareSelection(), true); }\n      this.div.focus();\n    }\n  };\n  ContentEditableInput.prototype.blur = function () { this.div.blur(); };\n  ContentEditableInput.prototype.getField = function () { return this.div };\n\n  ContentEditableInput.prototype.supportsTouch = function () { return true };\n\n  ContentEditableInput.prototype.receivedFocus = function () {\n    var input = this;\n    if (this.selectionInEditor())\n      { this.pollSelection(); }\n    else\n      { runInOp(this.cm, function () { return input.cm.curOp.selectionChanged = true; }); }\n\n    function poll() {\n      if (input.cm.state.focused) {\n        input.pollSelection();\n        input.polling.set(input.cm.options.pollInterval, poll);\n      }\n    }\n    this.polling.set(this.cm.options.pollInterval, poll);\n  };\n\n  ContentEditableInput.prototype.selectionChanged = function () {\n    var sel = this.getSelection();\n    return sel.anchorNode != this.lastAnchorNode || sel.anchorOffset != this.lastAnchorOffset ||\n      sel.focusNode != this.lastFocusNode || sel.focusOffset != this.lastFocusOffset\n  };\n\n  ContentEditableInput.prototype.pollSelection = function () {\n    if (this.readDOMTimeout != null || this.gracePeriod || !this.selectionChanged()) { return }\n    var sel = this.getSelection(), cm = this.cm;\n    // On Android Chrome (version 56, at least), backspacing into an\n    // uneditable block element will put the cursor in that element,\n    // and then, because it's not editable, hide the virtual keyboard.\n    // Because Android doesn't allow us to actually detect backspace\n    // presses in a sane way, this code checks for when that happens\n    // and simulates a backspace press in this case.\n    if (android && chrome && this.cm.display.gutterSpecs.length && isInGutter(sel.anchorNode)) {\n      this.cm.triggerOnKeyDown({type: \"keydown\", keyCode: 8, preventDefault: Math.abs});\n      this.blur();\n      this.focus();\n      return\n    }\n    if (this.composing) { return }\n    this.rememberSelection();\n    var anchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);\n    var head = domToPos(cm, sel.focusNode, sel.focusOffset);\n    if (anchor && head) { runInOp(cm, function () {\n      setSelection(cm.doc, simpleSelection(anchor, head), sel_dontScroll);\n      if (anchor.bad || head.bad) { cm.curOp.selectionChanged = true; }\n    }); }\n  };\n\n  ContentEditableInput.prototype.pollContent = function () {\n    if (this.readDOMTimeout != null) {\n      clearTimeout(this.readDOMTimeout);\n      this.readDOMTimeout = null;\n    }\n\n    var cm = this.cm, display = cm.display, sel = cm.doc.sel.primary();\n    var from = sel.from(), to = sel.to();\n    if (from.ch == 0 && from.line > cm.firstLine())\n      { from = Pos(from.line - 1, getLine(cm.doc, from.line - 1).length); }\n    if (to.ch == getLine(cm.doc, to.line).text.length && to.line < cm.lastLine())\n      { to = Pos(to.line + 1, 0); }\n    if (from.line < display.viewFrom || to.line > display.viewTo - 1) { return false }\n\n    var fromIndex, fromLine, fromNode;\n    if (from.line == display.viewFrom || (fromIndex = findViewIndex(cm, from.line)) == 0) {\n      fromLine = lineNo(display.view[0].line);\n      fromNode = display.view[0].node;\n    } else {\n      fromLine = lineNo(display.view[fromIndex].line);\n      fromNode = display.view[fromIndex - 1].node.nextSibling;\n    }\n    var toIndex = findViewIndex(cm, to.line);\n    var toLine, toNode;\n    if (toIndex == display.view.length - 1) {\n      toLine = display.viewTo - 1;\n      toNode = display.lineDiv.lastChild;\n    } else {\n      toLine = lineNo(display.view[toIndex + 1].line) - 1;\n      toNode = display.view[toIndex + 1].node.previousSibling;\n    }\n\n    if (!fromNode) { return false }\n    var newText = cm.doc.splitLines(domTextBetween(cm, fromNode, toNode, fromLine, toLine));\n    var oldText = getBetween(cm.doc, Pos(fromLine, 0), Pos(toLine, getLine(cm.doc, toLine).text.length));\n    while (newText.length > 1 && oldText.length > 1) {\n      if (lst(newText) == lst(oldText)) { newText.pop(); oldText.pop(); toLine--; }\n      else if (newText[0] == oldText[0]) { newText.shift(); oldText.shift(); fromLine++; }\n      else { break }\n    }\n\n    var cutFront = 0, cutEnd = 0;\n    var newTop = newText[0], oldTop = oldText[0], maxCutFront = Math.min(newTop.length, oldTop.length);\n    while (cutFront < maxCutFront && newTop.charCodeAt(cutFront) == oldTop.charCodeAt(cutFront))\n      { ++cutFront; }\n    var newBot = lst(newText), oldBot = lst(oldText);\n    var maxCutEnd = Math.min(newBot.length - (newText.length == 1 ? cutFront : 0),\n                             oldBot.length - (oldText.length == 1 ? cutFront : 0));\n    while (cutEnd < maxCutEnd &&\n           newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1))\n      { ++cutEnd; }\n    // Try to move start of change to start of selection if ambiguous\n    if (newText.length == 1 && oldText.length == 1 && fromLine == from.line) {\n      while (cutFront && cutFront > from.ch &&\n             newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1)) {\n        cutFront--;\n        cutEnd++;\n      }\n    }\n\n    newText[newText.length - 1] = newBot.slice(0, newBot.length - cutEnd).replace(/^\\u200b+/, \"\");\n    newText[0] = newText[0].slice(cutFront).replace(/\\u200b+$/, \"\");\n\n    var chFrom = Pos(fromLine, cutFront);\n    var chTo = Pos(toLine, oldText.length ? lst(oldText).length - cutEnd : 0);\n    if (newText.length > 1 || newText[0] || cmp(chFrom, chTo)) {\n      replaceRange(cm.doc, newText, chFrom, chTo, \"+input\");\n      return true\n    }\n  };\n\n  ContentEditableInput.prototype.ensurePolled = function () {\n    this.forceCompositionEnd();\n  };\n  ContentEditableInput.prototype.reset = function () {\n    this.forceCompositionEnd();\n  };\n  ContentEditableInput.prototype.forceCompositionEnd = function () {\n    if (!this.composing) { return }\n    clearTimeout(this.readDOMTimeout);\n    this.composing = null;\n    this.updateFromDOM();\n    this.div.blur();\n    this.div.focus();\n  };\n  ContentEditableInput.prototype.readFromDOMSoon = function () {\n      var this$1 = this;\n\n    if (this.readDOMTimeout != null) { return }\n    this.readDOMTimeout = setTimeout(function () {\n      this$1.readDOMTimeout = null;\n      if (this$1.composing) {\n        if (this$1.composing.done) { this$1.composing = null; }\n        else { return }\n      }\n      this$1.updateFromDOM();\n    }, 80);\n  };\n\n  ContentEditableInput.prototype.updateFromDOM = function () {\n      var this$1 = this;\n\n    if (this.cm.isReadOnly() || !this.pollContent())\n      { runInOp(this.cm, function () { return regChange(this$1.cm); }); }\n  };\n\n  ContentEditableInput.prototype.setUneditable = function (node) {\n    node.contentEditable = \"false\";\n  };\n\n  ContentEditableInput.prototype.onKeyPress = function (e) {\n    if (e.charCode == 0 || this.composing) { return }\n    e.preventDefault();\n    if (!this.cm.isReadOnly())\n      { operation(this.cm, applyTextInput)(this.cm, String.fromCharCode(e.charCode == null ? e.keyCode : e.charCode), 0); }\n  };\n\n  ContentEditableInput.prototype.readOnlyChanged = function (val) {\n    this.div.contentEditable = String(val != \"nocursor\");\n  };\n\n  ContentEditableInput.prototype.onContextMenu = function () {};\n  ContentEditableInput.prototype.resetPosition = function () {};\n\n  ContentEditableInput.prototype.needsContentAttribute = true;\n\n  function posToDOM(cm, pos) {\n    var view = findViewForLine(cm, pos.line);\n    if (!view || view.hidden) { return null }\n    var line = getLine(cm.doc, pos.line);\n    var info = mapFromLineView(view, line, pos.line);\n\n    var order = getOrder(line, cm.doc.direction), side = \"left\";\n    if (order) {\n      var partPos = getBidiPartAt(order, pos.ch);\n      side = partPos % 2 ? \"right\" : \"left\";\n    }\n    var result = nodeAndOffsetInLineMap(info.map, pos.ch, side);\n    result.offset = result.collapse == \"right\" ? result.end : result.start;\n    return result\n  }\n\n  function isInGutter(node) {\n    for (var scan = node; scan; scan = scan.parentNode)\n      { if (/CodeMirror-gutter-wrapper/.test(scan.className)) { return true } }\n    return false\n  }\n\n  function badPos(pos, bad) { if (bad) { pos.bad = true; } return pos }\n\n  function domTextBetween(cm, from, to, fromLine, toLine) {\n    var text = \"\", closing = false, lineSep = cm.doc.lineSeparator(), extraLinebreak = false;\n    function recognizeMarker(id) { return function (marker) { return marker.id == id; } }\n    function close() {\n      if (closing) {\n        text += lineSep;\n        if (extraLinebreak) { text += lineSep; }\n        closing = extraLinebreak = false;\n      }\n    }\n    function addText(str) {\n      if (str) {\n        close();\n        text += str;\n      }\n    }\n    function walk(node) {\n      if (node.nodeType == 1) {\n        var cmText = node.getAttribute(\"cm-text\");\n        if (cmText) {\n          addText(cmText);\n          return\n        }\n        var markerID = node.getAttribute(\"cm-marker\"), range;\n        if (markerID) {\n          var found = cm.findMarks(Pos(fromLine, 0), Pos(toLine + 1, 0), recognizeMarker(+markerID));\n          if (found.length && (range = found[0].find(0)))\n            { addText(getBetween(cm.doc, range.from, range.to).join(lineSep)); }\n          return\n        }\n        if (node.getAttribute(\"contenteditable\") == \"false\") { return }\n        var isBlock = /^(pre|div|p|li|table|br)$/i.test(node.nodeName);\n        if (!/^br$/i.test(node.nodeName) && node.textContent.length == 0) { return }\n\n        if (isBlock) { close(); }\n        for (var i = 0; i < node.childNodes.length; i++)\n          { walk(node.childNodes[i]); }\n\n        if (/^(pre|p)$/i.test(node.nodeName)) { extraLinebreak = true; }\n        if (isBlock) { closing = true; }\n      } else if (node.nodeType == 3) {\n        addText(node.nodeValue.replace(/\\u200b/g, \"\").replace(/\\u00a0/g, \" \"));\n      }\n    }\n    for (;;) {\n      walk(from);\n      if (from == to) { break }\n      from = from.nextSibling;\n      extraLinebreak = false;\n    }\n    return text\n  }\n\n  function domToPos(cm, node, offset) {\n    var lineNode;\n    if (node == cm.display.lineDiv) {\n      lineNode = cm.display.lineDiv.childNodes[offset];\n      if (!lineNode) { return badPos(cm.clipPos(Pos(cm.display.viewTo - 1)), true) }\n      node = null; offset = 0;\n    } else {\n      for (lineNode = node;; lineNode = lineNode.parentNode) {\n        if (!lineNode || lineNode == cm.display.lineDiv) { return null }\n        if (lineNode.parentNode && lineNode.parentNode == cm.display.lineDiv) { break }\n      }\n    }\n    for (var i = 0; i < cm.display.view.length; i++) {\n      var lineView = cm.display.view[i];\n      if (lineView.node == lineNode)\n        { return locateNodeInLineView(lineView, node, offset) }\n    }\n  }\n\n  function locateNodeInLineView(lineView, node, offset) {\n    var wrapper = lineView.text.firstChild, bad = false;\n    if (!node || !contains(wrapper, node)) { return badPos(Pos(lineNo(lineView.line), 0), true) }\n    if (node == wrapper) {\n      bad = true;\n      node = wrapper.childNodes[offset];\n      offset = 0;\n      if (!node) {\n        var line = lineView.rest ? lst(lineView.rest) : lineView.line;\n        return badPos(Pos(lineNo(line), line.text.length), bad)\n      }\n    }\n\n    var textNode = node.nodeType == 3 ? node : null, topNode = node;\n    if (!textNode && node.childNodes.length == 1 && node.firstChild.nodeType == 3) {\n      textNode = node.firstChild;\n      if (offset) { offset = textNode.nodeValue.length; }\n    }\n    while (topNode.parentNode != wrapper) { topNode = topNode.parentNode; }\n    var measure = lineView.measure, maps = measure.maps;\n\n    function find(textNode, topNode, offset) {\n      for (var i = -1; i < (maps ? maps.length : 0); i++) {\n        var map = i < 0 ? measure.map : maps[i];\n        for (var j = 0; j < map.length; j += 3) {\n          var curNode = map[j + 2];\n          if (curNode == textNode || curNode == topNode) {\n            var line = lineNo(i < 0 ? lineView.line : lineView.rest[i]);\n            var ch = map[j] + offset;\n            if (offset < 0 || curNode != textNode) { ch = map[j + (offset ? 1 : 0)]; }\n            return Pos(line, ch)\n          }\n        }\n      }\n    }\n    var found = find(textNode, topNode, offset);\n    if (found) { return badPos(found, bad) }\n\n    // FIXME this is all really shaky. might handle the few cases it needs to handle, but likely to cause problems\n    for (var after = topNode.nextSibling, dist = textNode ? textNode.nodeValue.length - offset : 0; after; after = after.nextSibling) {\n      found = find(after, after.firstChild, 0);\n      if (found)\n        { return badPos(Pos(found.line, found.ch - dist), bad) }\n      else\n        { dist += after.textContent.length; }\n    }\n    for (var before = topNode.previousSibling, dist$1 = offset; before; before = before.previousSibling) {\n      found = find(before, before.firstChild, -1);\n      if (found)\n        { return badPos(Pos(found.line, found.ch + dist$1), bad) }\n      else\n        { dist$1 += before.textContent.length; }\n    }\n  }\n\n  // TEXTAREA INPUT STYLE\n\n  var TextareaInput = function(cm) {\n    this.cm = cm;\n    // See input.poll and input.reset\n    this.prevInput = \"\";\n\n    // Flag that indicates whether we expect input to appear real soon\n    // now (after some event like 'keypress' or 'input') and are\n    // polling intensively.\n    this.pollingFast = false;\n    // Self-resetting timeout for the poller\n    this.polling = new Delayed();\n    // Used to work around IE issue with selection being forgotten when focus moves away from textarea\n    this.hasSelection = false;\n    this.composing = null;\n  };\n\n  TextareaInput.prototype.init = function (display) {\n      var this$1 = this;\n\n    var input = this, cm = this.cm;\n    this.createField(display);\n    var te = this.textarea;\n\n    display.wrapper.insertBefore(this.wrapper, display.wrapper.firstChild);\n\n    // Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)\n    if (ios) { te.style.width = \"0px\"; }\n\n    on(te, \"input\", function () {\n      if (ie && ie_version >= 9 && this$1.hasSelection) { this$1.hasSelection = null; }\n      input.poll();\n    });\n\n    on(te, \"paste\", function (e) {\n      if (signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }\n\n      cm.state.pasteIncoming = +new Date;\n      input.fastPoll();\n    });\n\n    function prepareCopyCut(e) {\n      if (signalDOMEvent(cm, e)) { return }\n      if (cm.somethingSelected()) {\n        setLastCopied({lineWise: false, text: cm.getSelections()});\n      } else if (!cm.options.lineWiseCopyCut) {\n        return\n      } else {\n        var ranges = copyableRanges(cm);\n        setLastCopied({lineWise: true, text: ranges.text});\n        if (e.type == \"cut\") {\n          cm.setSelections(ranges.ranges, null, sel_dontScroll);\n        } else {\n          input.prevInput = \"\";\n          te.value = ranges.text.join(\"\\n\");\n          selectInput(te);\n        }\n      }\n      if (e.type == \"cut\") { cm.state.cutIncoming = +new Date; }\n    }\n    on(te, \"cut\", prepareCopyCut);\n    on(te, \"copy\", prepareCopyCut);\n\n    on(display.scroller, \"paste\", function (e) {\n      if (eventInWidget(display, e) || signalDOMEvent(cm, e)) { return }\n      if (!te.dispatchEvent) {\n        cm.state.pasteIncoming = +new Date;\n        input.focus();\n        return\n      }\n\n      // Pass the `paste` event to the textarea so it's handled by its event listener.\n      var event = new Event(\"paste\");\n      event.clipboardData = e.clipboardData;\n      te.dispatchEvent(event);\n    });\n\n    // Prevent normal selection in the editor (we handle our own)\n    on(display.lineSpace, \"selectstart\", function (e) {\n      if (!eventInWidget(display, e)) { e_preventDefault(e); }\n    });\n\n    on(te, \"compositionstart\", function () {\n      var start = cm.getCursor(\"from\");\n      if (input.composing) { input.composing.range.clear(); }\n      input.composing = {\n        start: start,\n        range: cm.markText(start, cm.getCursor(\"to\"), {className: \"CodeMirror-composing\"})\n      };\n    });\n    on(te, \"compositionend\", function () {\n      if (input.composing) {\n        input.poll();\n        input.composing.range.clear();\n        input.composing = null;\n      }\n    });\n  };\n\n  TextareaInput.prototype.createField = function (_display) {\n    // Wraps and hides input textarea\n    this.wrapper = hiddenTextarea();\n    // The semihidden textarea that is focused when the editor is\n    // focused, and receives input.\n    this.textarea = this.wrapper.firstChild;\n  };\n\n  TextareaInput.prototype.screenReaderLabelChanged = function (label) {\n    // Label for screenreaders, accessibility\n    if(label) {\n      this.textarea.setAttribute('aria-label', label);\n    } else {\n      this.textarea.removeAttribute('aria-label');\n    }\n  };\n\n  TextareaInput.prototype.prepareSelection = function () {\n    // Redraw the selection and/or cursor\n    var cm = this.cm, display = cm.display, doc = cm.doc;\n    var result = prepareSelection(cm);\n\n    // Move the hidden textarea near the cursor to prevent scrolling artifacts\n    if (cm.options.moveInputWithCursor) {\n      var headPos = cursorCoords(cm, doc.sel.primary().head, \"div\");\n      var wrapOff = display.wrapper.getBoundingClientRect(), lineOff = display.lineDiv.getBoundingClientRect();\n      result.teTop = Math.max(0, Math.min(display.wrapper.clientHeight - 10,\n                                          headPos.top + lineOff.top - wrapOff.top));\n      result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10,\n                                           headPos.left + lineOff.left - wrapOff.left));\n    }\n\n    return result\n  };\n\n  TextareaInput.prototype.showSelection = function (drawn) {\n    var cm = this.cm, display = cm.display;\n    removeChildrenAndAdd(display.cursorDiv, drawn.cursors);\n    removeChildrenAndAdd(display.selectionDiv, drawn.selection);\n    if (drawn.teTop != null) {\n      this.wrapper.style.top = drawn.teTop + \"px\";\n      this.wrapper.style.left = drawn.teLeft + \"px\";\n    }\n  };\n\n  // Reset the input to correspond to the selection (or to be empty,\n  // when not typing and nothing is selected)\n  TextareaInput.prototype.reset = function (typing) {\n    if (this.contextMenuPending || this.composing) { return }\n    var cm = this.cm;\n    if (cm.somethingSelected()) {\n      this.prevInput = \"\";\n      var content = cm.getSelection();\n      this.textarea.value = content;\n      if (cm.state.focused) { selectInput(this.textarea); }\n      if (ie && ie_version >= 9) { this.hasSelection = content; }\n    } else if (!typing) {\n      this.prevInput = this.textarea.value = \"\";\n      if (ie && ie_version >= 9) { this.hasSelection = null; }\n    }\n  };\n\n  TextareaInput.prototype.getField = function () { return this.textarea };\n\n  TextareaInput.prototype.supportsTouch = function () { return false };\n\n  TextareaInput.prototype.focus = function () {\n    if (this.cm.options.readOnly != \"nocursor\" && (!mobile || activeElt() != this.textarea)) {\n      try { this.textarea.focus(); }\n      catch (e) {} // IE8 will throw if the textarea is display: none or not in DOM\n    }\n  };\n\n  TextareaInput.prototype.blur = function () { this.textarea.blur(); };\n\n  TextareaInput.prototype.resetPosition = function () {\n    this.wrapper.style.top = this.wrapper.style.left = 0;\n  };\n\n  TextareaInput.prototype.receivedFocus = function () { this.slowPoll(); };\n\n  // Poll for input changes, using the normal rate of polling. This\n  // runs as long as the editor is focused.\n  TextareaInput.prototype.slowPoll = function () {\n      var this$1 = this;\n\n    if (this.pollingFast) { return }\n    this.polling.set(this.cm.options.pollInterval, function () {\n      this$1.poll();\n      if (this$1.cm.state.focused) { this$1.slowPoll(); }\n    });\n  };\n\n  // When an event has just come in that is likely to add or change\n  // something in the input textarea, we poll faster, to ensure that\n  // the change appears on the screen quickly.\n  TextareaInput.prototype.fastPoll = function () {\n    var missed = false, input = this;\n    input.pollingFast = true;\n    function p() {\n      var changed = input.poll();\n      if (!changed && !missed) {missed = true; input.polling.set(60, p);}\n      else {input.pollingFast = false; input.slowPoll();}\n    }\n    input.polling.set(20, p);\n  };\n\n  // Read input from the textarea, and update the document to match.\n  // When something is selected, it is present in the textarea, and\n  // selected (unless it is huge, in which case a placeholder is\n  // used). When nothing is selected, the cursor sits after previously\n  // seen text (can be empty), which is stored in prevInput (we must\n  // not reset the textarea when typing, because that breaks IME).\n  TextareaInput.prototype.poll = function () {\n      var this$1 = this;\n\n    var cm = this.cm, input = this.textarea, prevInput = this.prevInput;\n    // Since this is called a *lot*, try to bail out as cheaply as\n    // possible when it is clear that nothing happened. hasSelection\n    // will be the case when there is a lot of text in the textarea,\n    // in which case reading its value would be expensive.\n    if (this.contextMenuPending || !cm.state.focused ||\n        (hasSelection(input) && !prevInput && !this.composing) ||\n        cm.isReadOnly() || cm.options.disableInput || cm.state.keySeq)\n      { return false }\n\n    var text = input.value;\n    // If nothing changed, bail.\n    if (text == prevInput && !cm.somethingSelected()) { return false }\n    // Work around nonsensical selection resetting in IE9/10, and\n    // inexplicable appearance of private area unicode characters on\n    // some key combos in Mac (#2689).\n    if (ie && ie_version >= 9 && this.hasSelection === text ||\n        mac && /[\\uf700-\\uf7ff]/.test(text)) {\n      cm.display.input.reset();\n      return false\n    }\n\n    if (cm.doc.sel == cm.display.selForContextMenu) {\n      var first = text.charCodeAt(0);\n      if (first == 0x200b && !prevInput) { prevInput = \"\\u200b\"; }\n      if (first == 0x21da) { this.reset(); return this.cm.execCommand(\"undo\") }\n    }\n    // Find the part of the input that is actually new\n    var same = 0, l = Math.min(prevInput.length, text.length);\n    while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) { ++same; }\n\n    runInOp(cm, function () {\n      applyTextInput(cm, text.slice(same), prevInput.length - same,\n                     null, this$1.composing ? \"*compose\" : null);\n\n      // Don't leave long text in the textarea, since it makes further polling slow\n      if (text.length > 1000 || text.indexOf(\"\\n\") > -1) { input.value = this$1.prevInput = \"\"; }\n      else { this$1.prevInput = text; }\n\n      if (this$1.composing) {\n        this$1.composing.range.clear();\n        this$1.composing.range = cm.markText(this$1.composing.start, cm.getCursor(\"to\"),\n                                           {className: \"CodeMirror-composing\"});\n      }\n    });\n    return true\n  };\n\n  TextareaInput.prototype.ensurePolled = function () {\n    if (this.pollingFast && this.poll()) { this.pollingFast = false; }\n  };\n\n  TextareaInput.prototype.onKeyPress = function () {\n    if (ie && ie_version >= 9) { this.hasSelection = null; }\n    this.fastPoll();\n  };\n\n  TextareaInput.prototype.onContextMenu = function (e) {\n    var input = this, cm = input.cm, display = cm.display, te = input.textarea;\n    if (input.contextMenuPending) { input.contextMenuPending(); }\n    var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop;\n    if (!pos || presto) { return } // Opera is difficult.\n\n    // Reset the current text selection only if the click is done outside of the selection\n    // and 'resetSelectionOnContextMenu' option is true.\n    var reset = cm.options.resetSelectionOnContextMenu;\n    if (reset && cm.doc.sel.contains(pos) == -1)\n      { operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll); }\n\n    var oldCSS = te.style.cssText, oldWrapperCSS = input.wrapper.style.cssText;\n    var wrapperBox = input.wrapper.offsetParent.getBoundingClientRect();\n    input.wrapper.style.cssText = \"position: static\";\n    te.style.cssText = \"position: absolute; width: 30px; height: 30px;\\n      top: \" + (e.clientY - wrapperBox.top - 5) + \"px; left: \" + (e.clientX - wrapperBox.left - 5) + \"px;\\n      z-index: 1000; background: \" + (ie ? \"rgba(255, 255, 255, .05)\" : \"transparent\") + \";\\n      outline: none; border-width: 0; outline: none; overflow: hidden; opacity: .05; filter: alpha(opacity=5);\";\n    var oldScrollY;\n    if (webkit) { oldScrollY = window.scrollY; } // Work around Chrome issue (#2712)\n    display.input.focus();\n    if (webkit) { window.scrollTo(null, oldScrollY); }\n    display.input.reset();\n    // Adds \"Select all\" to context menu in FF\n    if (!cm.somethingSelected()) { te.value = input.prevInput = \" \"; }\n    input.contextMenuPending = rehide;\n    display.selForContextMenu = cm.doc.sel;\n    clearTimeout(display.detectingSelectAll);\n\n    // Select-all will be greyed out if there's nothing to select, so\n    // this adds a zero-width space so that we can later check whether\n    // it got selected.\n    function prepareSelectAllHack() {\n      if (te.selectionStart != null) {\n        var selected = cm.somethingSelected();\n        var extval = \"\\u200b\" + (selected ? te.value : \"\");\n        te.value = \"\\u21da\"; // Used to catch context-menu undo\n        te.value = extval;\n        input.prevInput = selected ? \"\" : \"\\u200b\";\n        te.selectionStart = 1; te.selectionEnd = extval.length;\n        // Re-set this, in case some other handler touched the\n        // selection in the meantime.\n        display.selForContextMenu = cm.doc.sel;\n      }\n    }\n    function rehide() {\n      if (input.contextMenuPending != rehide) { return }\n      input.contextMenuPending = false;\n      input.wrapper.style.cssText = oldWrapperCSS;\n      te.style.cssText = oldCSS;\n      if (ie && ie_version < 9) { display.scrollbars.setScrollTop(display.scroller.scrollTop = scrollPos); }\n\n      // Try to detect the user choosing select-all\n      if (te.selectionStart != null) {\n        if (!ie || (ie && ie_version < 9)) { prepareSelectAllHack(); }\n        var i = 0, poll = function () {\n          if (display.selForContextMenu == cm.doc.sel && te.selectionStart == 0 &&\n              te.selectionEnd > 0 && input.prevInput == \"\\u200b\") {\n            operation(cm, selectAll)(cm);\n          } else if (i++ < 10) {\n            display.detectingSelectAll = setTimeout(poll, 500);\n          } else {\n            display.selForContextMenu = null;\n            display.input.reset();\n          }\n        };\n        display.detectingSelectAll = setTimeout(poll, 200);\n      }\n    }\n\n    if (ie && ie_version >= 9) { prepareSelectAllHack(); }\n    if (captureRightClick) {\n      e_stop(e);\n      var mouseup = function () {\n        off(window, \"mouseup\", mouseup);\n        setTimeout(rehide, 20);\n      };\n      on(window, \"mouseup\", mouseup);\n    } else {\n      setTimeout(rehide, 50);\n    }\n  };\n\n  TextareaInput.prototype.readOnlyChanged = function (val) {\n    if (!val) { this.reset(); }\n    this.textarea.disabled = val == \"nocursor\";\n  };\n\n  TextareaInput.prototype.setUneditable = function () {};\n\n  TextareaInput.prototype.needsContentAttribute = false;\n\n  function fromTextArea(textarea, options) {\n    options = options ? copyObj(options) : {};\n    options.value = textarea.value;\n    if (!options.tabindex && textarea.tabIndex)\n      { options.tabindex = textarea.tabIndex; }\n    if (!options.placeholder && textarea.placeholder)\n      { options.placeholder = textarea.placeholder; }\n    // Set autofocus to true if this textarea is focused, or if it has\n    // autofocus and no other element is focused.\n    if (options.autofocus == null) {\n      var hasFocus = activeElt();\n      options.autofocus = hasFocus == textarea ||\n        textarea.getAttribute(\"autofocus\") != null && hasFocus == document.body;\n    }\n\n    function save() {textarea.value = cm.getValue();}\n\n    var realSubmit;\n    if (textarea.form) {\n      on(textarea.form, \"submit\", save);\n      // Deplorable hack to make the submit method do the right thing.\n      if (!options.leaveSubmitMethodAlone) {\n        var form = textarea.form;\n        realSubmit = form.submit;\n        try {\n          var wrappedSubmit = form.submit = function () {\n            save();\n            form.submit = realSubmit;\n            form.submit();\n            form.submit = wrappedSubmit;\n          };\n        } catch(e) {}\n      }\n    }\n\n    options.finishInit = function (cm) {\n      cm.save = save;\n      cm.getTextArea = function () { return textarea; };\n      cm.toTextArea = function () {\n        cm.toTextArea = isNaN; // Prevent this from being ran twice\n        save();\n        textarea.parentNode.removeChild(cm.getWrapperElement());\n        textarea.style.display = \"\";\n        if (textarea.form) {\n          off(textarea.form, \"submit\", save);\n          if (!options.leaveSubmitMethodAlone && typeof textarea.form.submit == \"function\")\n            { textarea.form.submit = realSubmit; }\n        }\n      };\n    };\n\n    textarea.style.display = \"none\";\n    var cm = CodeMirror(function (node) { return textarea.parentNode.insertBefore(node, textarea.nextSibling); },\n      options);\n    return cm\n  }\n\n  function addLegacyProps(CodeMirror) {\n    CodeMirror.off = off;\n    CodeMirror.on = on;\n    CodeMirror.wheelEventPixels = wheelEventPixels;\n    CodeMirror.Doc = Doc;\n    CodeMirror.splitLines = splitLinesAuto;\n    CodeMirror.countColumn = countColumn;\n    CodeMirror.findColumn = findColumn;\n    CodeMirror.isWordChar = isWordCharBasic;\n    CodeMirror.Pass = Pass;\n    CodeMirror.signal = signal;\n    CodeMirror.Line = Line;\n    CodeMirror.changeEnd = changeEnd;\n    CodeMirror.scrollbarModel = scrollbarModel;\n    CodeMirror.Pos = Pos;\n    CodeMirror.cmpPos = cmp;\n    CodeMirror.modes = modes;\n    CodeMirror.mimeModes = mimeModes;\n    CodeMirror.resolveMode = resolveMode;\n    CodeMirror.getMode = getMode;\n    CodeMirror.modeExtensions = modeExtensions;\n    CodeMirror.extendMode = extendMode;\n    CodeMirror.copyState = copyState;\n    CodeMirror.startState = startState;\n    CodeMirror.innerMode = innerMode;\n    CodeMirror.commands = commands;\n    CodeMirror.keyMap = keyMap;\n    CodeMirror.keyName = keyName;\n    CodeMirror.isModifierKey = isModifierKey;\n    CodeMirror.lookupKey = lookupKey;\n    CodeMirror.normalizeKeyMap = normalizeKeyMap;\n    CodeMirror.StringStream = StringStream;\n    CodeMirror.SharedTextMarker = SharedTextMarker;\n    CodeMirror.TextMarker = TextMarker;\n    CodeMirror.LineWidget = LineWidget;\n    CodeMirror.e_preventDefault = e_preventDefault;\n    CodeMirror.e_stopPropagation = e_stopPropagation;\n    CodeMirror.e_stop = e_stop;\n    CodeMirror.addClass = addClass;\n    CodeMirror.contains = contains;\n    CodeMirror.rmClass = rmClass;\n    CodeMirror.keyNames = keyNames;\n  }\n\n  // EDITOR CONSTRUCTOR\n\n  defineOptions(CodeMirror);\n\n  addEditorMethods(CodeMirror);\n\n  // Set up methods on CodeMirror's prototype to redirect to the editor's document.\n  var dontDelegate = \"iter insert remove copy getEditor constructor\".split(\" \");\n  for (var prop in Doc.prototype) { if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0)\n    { CodeMirror.prototype[prop] = (function(method) {\n      return function() {return method.apply(this.doc, arguments)}\n    })(Doc.prototype[prop]); } }\n\n  eventMixin(Doc);\n  CodeMirror.inputStyles = {\"textarea\": TextareaInput, \"contenteditable\": ContentEditableInput};\n\n  // Extra arguments are stored as the mode's dependencies, which is\n  // used by (legacy) mechanisms like loadmode.js to automatically\n  // load a mode. (Preferred mechanism is the require/define calls.)\n  CodeMirror.defineMode = function(name/*, mode, …*/) {\n    if (!CodeMirror.defaults.mode && name != \"null\") { CodeMirror.defaults.mode = name; }\n    defineMode.apply(this, arguments);\n  };\n\n  CodeMirror.defineMIME = defineMIME;\n\n  // Minimal default mode.\n  CodeMirror.defineMode(\"null\", function () { return ({token: function (stream) { return stream.skipToEnd(); }}); });\n  CodeMirror.defineMIME(\"text/plain\", \"null\");\n\n  // EXTENSIONS\n\n  CodeMirror.defineExtension = function (name, func) {\n    CodeMirror.prototype[name] = func;\n  };\n  CodeMirror.defineDocExtension = function (name, func) {\n    Doc.prototype[name] = func;\n  };\n\n  CodeMirror.fromTextArea = fromTextArea;\n\n  addLegacyProps(CodeMirror);\n\n  CodeMirror.version = \"5.54.0\";\n\n  return CodeMirror;\n\n})));\n",";(function (globalScope) {\r\n  'use strict';\r\n\r\n\r\n  /*\r\n   *  decimal.js v10.2.0\r\n   *  An arbitrary-precision Decimal type for JavaScript.\r\n   *  https://github.com/MikeMcl/decimal.js\r\n   *  Copyright (c) 2019 Michael Mclaughlin <M8ch88l@gmail.com>\r\n   *  MIT Licence\r\n   */\r\n\r\n\r\n  // -----------------------------------  EDITABLE DEFAULTS  ------------------------------------ //\r\n\r\n\r\n    // The maximum exponent magnitude.\r\n    // The limit on the value of `toExpNeg`, `toExpPos`, `minE` and `maxE`.\r\n  var EXP_LIMIT = 9e15,                      // 0 to 9e15\r\n\r\n    // The limit on the value of `precision`, and on the value of the first argument to\r\n    // `toDecimalPlaces`, `toExponential`, `toFixed`, `toPrecision` and `toSignificantDigits`.\r\n    MAX_DIGITS = 1e9,                        // 0 to 1e9\r\n\r\n    // Base conversion alphabet.\r\n    NUMERALS = '0123456789abcdef',\r\n\r\n    // The natural logarithm of 10 (1025 digits).\r\n    LN10 = '2.3025850929940456840179914546843642076011014886287729760333279009675726096773524802359972050895982983419677840422862486334095254650828067566662873690987816894829072083255546808437998948262331985283935053089653777326288461633662222876982198867465436674744042432743651550489343149393914796194044002221051017141748003688084012647080685567743216228355220114804663715659121373450747856947683463616792101806445070648000277502684916746550586856935673420670581136429224554405758925724208241314695689016758940256776311356919292033376587141660230105703089634572075440370847469940168269282808481184289314848524948644871927809676271275775397027668605952496716674183485704422507197965004714951050492214776567636938662976979522110718264549734772662425709429322582798502585509785265383207606726317164309505995087807523710333101197857547331541421808427543863591778117054309827482385045648019095610299291824318237525357709750539565187697510374970888692180205189339507238539205144634197265287286965110862571492198849978748873771345686209167058',\r\n\r\n    // Pi (1025 digits).\r\n    PI = '3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870066063155881748815209209628292540917153643678925903600113305305488204665213841469519415116094330572703657595919530921861173819326117931051185480744623799627495673518857527248912279381830119491298336733624406566430860213949463952247371907021798609437027705392171762931767523846748184676694051320005681271452635608277857713427577896091736371787214684409012249534301465495853710507922796892589235420199561121290219608640344181598136297747713099605187072113499999983729780499510597317328160963185950244594553469083026425223082533446850352619311881710100031378387528865875332083814206171776691473035982534904287554687311595628638823537875937519577818577805321712268066130019278766111959092164201989380952572010654858632789',\r\n\r\n\r\n    // The initial configuration properties of the Decimal constructor.\r\n    DEFAULTS = {\r\n\r\n      // These values must be integers within the stated ranges (inclusive).\r\n      // Most of these values can be changed at run-time using the `Decimal.config` method.\r\n\r\n      // The maximum number of significant digits of the result of a calculation or base conversion.\r\n      // E.g. `Decimal.config({ precision: 20 });`\r\n      precision: 20,                         // 1 to MAX_DIGITS\r\n\r\n      // The rounding mode used when rounding to `precision`.\r\n      //\r\n      // ROUND_UP         0 Away from zero.\r\n      // ROUND_DOWN       1 Towards zero.\r\n      // ROUND_CEIL       2 Towards +Infinity.\r\n      // ROUND_FLOOR      3 Towards -Infinity.\r\n      // ROUND_HALF_UP    4 Towards nearest neighbour. If equidistant, up.\r\n      // ROUND_HALF_DOWN  5 Towards nearest neighbour. If equidistant, down.\r\n      // ROUND_HALF_EVEN  6 Towards nearest neighbour. If equidistant, towards even neighbour.\r\n      // ROUND_HALF_CEIL  7 Towards nearest neighbour. If equidistant, towards +Infinity.\r\n      // ROUND_HALF_FLOOR 8 Towards nearest neighbour. If equidistant, towards -Infinity.\r\n      //\r\n      // E.g.\r\n      // `Decimal.rounding = 4;`\r\n      // `Decimal.rounding = Decimal.ROUND_HALF_UP;`\r\n      rounding: 4,                           // 0 to 8\r\n\r\n      // The modulo mode used when calculating the modulus: a mod n.\r\n      // The quotient (q = a / n) is calculated according to the corresponding rounding mode.\r\n      // The remainder (r) is calculated as: r = a - n * q.\r\n      //\r\n      // UP         0 The remainder is positive if the dividend is negative, else is negative.\r\n      // DOWN       1 The remainder has the same sign as the dividend (JavaScript %).\r\n      // FLOOR      3 The remainder has the same sign as the divisor (Python %).\r\n      // HALF_EVEN  6 The IEEE 754 remainder function.\r\n      // EUCLID     9 Euclidian division. q = sign(n) * floor(a / abs(n)). Always positive.\r\n      //\r\n      // Truncated division (1), floored division (3), the IEEE 754 remainder (6), and Euclidian\r\n      // division (9) are commonly used for the modulus operation. The other rounding modes can also\r\n      // be used, but they may not give useful results.\r\n      modulo: 1,                             // 0 to 9\r\n\r\n      // The exponent value at and beneath which `toString` returns exponential notation.\r\n      // JavaScript numbers: -7\r\n      toExpNeg: -7,                          // 0 to -EXP_LIMIT\r\n\r\n      // The exponent value at and above which `toString` returns exponential notation.\r\n      // JavaScript numbers: 21\r\n      toExpPos:  21,                         // 0 to EXP_LIMIT\r\n\r\n      // The minimum exponent value, beneath which underflow to zero occurs.\r\n      // JavaScript numbers: -324  (5e-324)\r\n      minE: -EXP_LIMIT,                      // -1 to -EXP_LIMIT\r\n\r\n      // The maximum exponent value, above which overflow to Infinity occurs.\r\n      // JavaScript numbers: 308  (1.7976931348623157e+308)\r\n      maxE: EXP_LIMIT,                       // 1 to EXP_LIMIT\r\n\r\n      // Whether to use cryptographically-secure random number generation, if available.\r\n      crypto: false                          // true/false\r\n    },\r\n\r\n\r\n  // ----------------------------------- END OF EDITABLE DEFAULTS ------------------------------- //\r\n\r\n\r\n    Decimal, inexact, noConflict, quadrant,\r\n    external = true,\r\n\r\n    decimalError = '[DecimalError] ',\r\n    invalidArgument = decimalError + 'Invalid argument: ',\r\n    precisionLimitExceeded = decimalError + 'Precision limit exceeded',\r\n    cryptoUnavailable = decimalError + 'crypto unavailable',\r\n\r\n    mathfloor = Math.floor,\r\n    mathpow = Math.pow,\r\n\r\n    isBinary = /^0b([01]+(\\.[01]*)?|\\.[01]+)(p[+-]?\\d+)?$/i,\r\n    isHex = /^0x([0-9a-f]+(\\.[0-9a-f]*)?|\\.[0-9a-f]+)(p[+-]?\\d+)?$/i,\r\n    isOctal = /^0o([0-7]+(\\.[0-7]*)?|\\.[0-7]+)(p[+-]?\\d+)?$/i,\r\n    isDecimal = /^(\\d+(\\.\\d*)?|\\.\\d+)(e[+-]?\\d+)?$/i,\r\n\r\n    BASE = 1e7,\r\n    LOG_BASE = 7,\r\n    MAX_SAFE_INTEGER = 9007199254740991,\r\n\r\n    LN10_PRECISION = LN10.length - 1,\r\n    PI_PRECISION = PI.length - 1,\r\n\r\n    // Decimal.prototype object\r\n    P = { name: '[object Decimal]' };\r\n\r\n\r\n  // Decimal prototype methods\r\n\r\n\r\n  /*\r\n   *  absoluteValue             abs\r\n   *  ceil\r\n   *  comparedTo                cmp\r\n   *  cosine                    cos\r\n   *  cubeRoot                  cbrt\r\n   *  decimalPlaces             dp\r\n   *  dividedBy                 div\r\n   *  dividedToIntegerBy        divToInt\r\n   *  equals                    eq\r\n   *  floor\r\n   *  greaterThan               gt\r\n   *  greaterThanOrEqualTo      gte\r\n   *  hyperbolicCosine          cosh\r\n   *  hyperbolicSine            sinh\r\n   *  hyperbolicTangent         tanh\r\n   *  inverseCosine             acos\r\n   *  inverseHyperbolicCosine   acosh\r\n   *  inverseHyperbolicSine     asinh\r\n   *  inverseHyperbolicTangent  atanh\r\n   *  inverseSine               asin\r\n   *  inverseTangent            atan\r\n   *  isFinite\r\n   *  isInteger                 isInt\r\n   *  isNaN\r\n   *  isNegative                isNeg\r\n   *  isPositive                isPos\r\n   *  isZero\r\n   *  lessThan                  lt\r\n   *  lessThanOrEqualTo         lte\r\n   *  logarithm                 log\r\n   *  [maximum]                 [max]\r\n   *  [minimum]                 [min]\r\n   *  minus                     sub\r\n   *  modulo                    mod\r\n   *  naturalExponential        exp\r\n   *  naturalLogarithm          ln\r\n   *  negated                   neg\r\n   *  plus                      add\r\n   *  precision                 sd\r\n   *  round\r\n   *  sine                      sin\r\n   *  squareRoot                sqrt\r\n   *  tangent                   tan\r\n   *  times                     mul\r\n   *  toBinary\r\n   *  toDecimalPlaces           toDP\r\n   *  toExponential\r\n   *  toFixed\r\n   *  toFraction\r\n   *  toHexadecimal             toHex\r\n   *  toNearest\r\n   *  toNumber\r\n   *  toOctal\r\n   *  toPower                   pow\r\n   *  toPrecision\r\n   *  toSignificantDigits       toSD\r\n   *  toString\r\n   *  truncated                 trunc\r\n   *  valueOf                   toJSON\r\n   */\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the absolute value of this Decimal.\r\n   *\r\n   */\r\n  P.absoluteValue = P.abs = function () {\r\n    var x = new this.constructor(this);\r\n    if (x.s < 0) x.s = 1;\r\n    return finalise(x);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the value of this Decimal rounded to a whole number in the\r\n   * direction of positive Infinity.\r\n   *\r\n   */\r\n  P.ceil = function () {\r\n    return finalise(new this.constructor(this), this.e + 1, 2);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return\r\n   *   1    if the value of this Decimal is greater than the value of `y`,\r\n   *  -1    if the value of this Decimal is less than the value of `y`,\r\n   *   0    if they have the same value,\r\n   *   NaN  if the value of either Decimal is NaN.\r\n   *\r\n   */\r\n  P.comparedTo = P.cmp = function (y) {\r\n    var i, j, xdL, ydL,\r\n      x = this,\r\n      xd = x.d,\r\n      yd = (y = new x.constructor(y)).d,\r\n      xs = x.s,\r\n      ys = y.s;\r\n\r\n    // Either NaN or ±Infinity?\r\n    if (!xd || !yd) {\r\n      return !xs || !ys ? NaN : xs !== ys ? xs : xd === yd ? 0 : !xd ^ xs < 0 ? 1 : -1;\r\n    }\r\n\r\n    // Either zero?\r\n    if (!xd[0] || !yd[0]) return xd[0] ? xs : yd[0] ? -ys : 0;\r\n\r\n    // Signs differ?\r\n    if (xs !== ys) return xs;\r\n\r\n    // Compare exponents.\r\n    if (x.e !== y.e) return x.e > y.e ^ xs < 0 ? 1 : -1;\r\n\r\n    xdL = xd.length;\r\n    ydL = yd.length;\r\n\r\n    // Compare digit by digit.\r\n    for (i = 0, j = xdL < ydL ? xdL : ydL; i < j; ++i) {\r\n      if (xd[i] !== yd[i]) return xd[i] > yd[i] ^ xs < 0 ? 1 : -1;\r\n    }\r\n\r\n    // Compare lengths.\r\n    return xdL === ydL ? 0 : xdL > ydL ^ xs < 0 ? 1 : -1;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the cosine of the value in radians of this Decimal.\r\n   *\r\n   * Domain: [-Infinity, Infinity]\r\n   * Range: [-1, 1]\r\n   *\r\n   * cos(0)         = 1\r\n   * cos(-0)        = 1\r\n   * cos(Infinity)  = NaN\r\n   * cos(-Infinity) = NaN\r\n   * cos(NaN)       = NaN\r\n   *\r\n   */\r\n  P.cosine = P.cos = function () {\r\n    var pr, rm,\r\n      x = this,\r\n      Ctor = x.constructor;\r\n\r\n    if (!x.d) return new Ctor(NaN);\r\n\r\n    // cos(0) = cos(-0) = 1\r\n    if (!x.d[0]) return new Ctor(1);\r\n\r\n    pr = Ctor.precision;\r\n    rm = Ctor.rounding;\r\n    Ctor.precision = pr + Math.max(x.e, x.sd()) + LOG_BASE;\r\n    Ctor.rounding = 1;\r\n\r\n    x = cosine(Ctor, toLessThanHalfPi(Ctor, x));\r\n\r\n    Ctor.precision = pr;\r\n    Ctor.rounding = rm;\r\n\r\n    return finalise(quadrant == 2 || quadrant == 3 ? x.neg() : x, pr, rm, true);\r\n  };\r\n\r\n\r\n  /*\r\n   *\r\n   * Return a new Decimal whose value is the cube root of the value of this Decimal, rounded to\r\n   * `precision` significant digits using rounding mode `rounding`.\r\n   *\r\n   *  cbrt(0)  =  0\r\n   *  cbrt(-0) = -0\r\n   *  cbrt(1)  =  1\r\n   *  cbrt(-1) = -1\r\n   *  cbrt(N)  =  N\r\n   *  cbrt(-I) = -I\r\n   *  cbrt(I)  =  I\r\n   *\r\n   * Math.cbrt(x) = (x < 0 ? -Math.pow(-x, 1/3) : Math.pow(x, 1/3))\r\n   *\r\n   */\r\n  P.cubeRoot = P.cbrt = function () {\r\n    var e, m, n, r, rep, s, sd, t, t3, t3plusx,\r\n      x = this,\r\n      Ctor = x.constructor;\r\n\r\n    if (!x.isFinite() || x.isZero()) return new Ctor(x);\r\n    external = false;\r\n\r\n    // Initial estimate.\r\n    s = x.s * mathpow(x.s * x, 1 / 3);\r\n\r\n     // Math.cbrt underflow/overflow?\r\n     // Pass x to Math.pow as integer, then adjust the exponent of the result.\r\n    if (!s || Math.abs(s) == 1 / 0) {\r\n      n = digitsToString(x.d);\r\n      e = x.e;\r\n\r\n      // Adjust n exponent so it is a multiple of 3 away from x exponent.\r\n      if (s = (e - n.length + 1) % 3) n += (s == 1 || s == -2 ? '0' : '00');\r\n      s = mathpow(n, 1 / 3);\r\n\r\n      // Rarely, e may be one less than the result exponent value.\r\n      e = mathfloor((e + 1) / 3) - (e % 3 == (e < 0 ? -1 : 2));\r\n\r\n      if (s == 1 / 0) {\r\n        n = '5e' + e;\r\n      } else {\r\n        n = s.toExponential();\r\n        n = n.slice(0, n.indexOf('e') + 1) + e;\r\n      }\r\n\r\n      r = new Ctor(n);\r\n      r.s = x.s;\r\n    } else {\r\n      r = new Ctor(s.toString());\r\n    }\r\n\r\n    sd = (e = Ctor.precision) + 3;\r\n\r\n    // Halley's method.\r\n    // TODO? Compare Newton's method.\r\n    for (;;) {\r\n      t = r;\r\n      t3 = t.times(t).times(t);\r\n      t3plusx = t3.plus(x);\r\n      r = divide(t3plusx.plus(x).times(t), t3plusx.plus(t3), sd + 2, 1);\r\n\r\n      // TODO? Replace with for-loop and checkRoundingDigits.\r\n      if (digitsToString(t.d).slice(0, sd) === (n = digitsToString(r.d)).slice(0, sd)) {\r\n        n = n.slice(sd - 3, sd + 1);\r\n\r\n        // The 4th rounding digit may be in error by -1 so if the 4 rounding digits are 9999 or 4999\r\n        // , i.e. approaching a rounding boundary, continue the iteration.\r\n        if (n == '9999' || !rep && n == '4999') {\r\n\r\n          // On the first iteration only, check to see if rounding up gives the exact result as the\r\n          // nines may infinitely repeat.\r\n          if (!rep) {\r\n            finalise(t, e + 1, 0);\r\n\r\n            if (t.times(t).times(t).eq(x)) {\r\n              r = t;\r\n              break;\r\n            }\r\n          }\r\n\r\n          sd += 4;\r\n          rep = 1;\r\n        } else {\r\n\r\n          // If the rounding digits are null, 0{0,4} or 50{0,3}, check for an exact result.\r\n          // If not, then there are further digits and m will be truthy.\r\n          if (!+n || !+n.slice(1) && n.charAt(0) == '5') {\r\n\r\n            // Truncate to the first rounding digit.\r\n            finalise(r, e + 1, 1);\r\n            m = !r.times(r).times(r).eq(x);\r\n          }\r\n\r\n          break;\r\n        }\r\n      }\r\n    }\r\n\r\n    external = true;\r\n\r\n    return finalise(r, e, Ctor.rounding, m);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return the number of decimal places of the value of this Decimal.\r\n   *\r\n   */\r\n  P.decimalPlaces = P.dp = function () {\r\n    var w,\r\n      d = this.d,\r\n      n = NaN;\r\n\r\n    if (d) {\r\n      w = d.length - 1;\r\n      n = (w - mathfloor(this.e / LOG_BASE)) * LOG_BASE;\r\n\r\n      // Subtract the number of trailing zeros of the last word.\r\n      w = d[w];\r\n      if (w) for (; w % 10 == 0; w /= 10) n--;\r\n      if (n < 0) n = 0;\r\n    }\r\n\r\n    return n;\r\n  };\r\n\r\n\r\n  /*\r\n   *  n / 0 = I\r\n   *  n / N = N\r\n   *  n / I = 0\r\n   *  0 / n = 0\r\n   *  0 / 0 = N\r\n   *  0 / N = N\r\n   *  0 / I = 0\r\n   *  N / n = N\r\n   *  N / 0 = N\r\n   *  N / N = N\r\n   *  N / I = N\r\n   *  I / n = I\r\n   *  I / 0 = I\r\n   *  I / N = N\r\n   *  I / I = N\r\n   *\r\n   * Return a new Decimal whose value is the value of this Decimal divided by `y`, rounded to\r\n   * `precision` significant digits using rounding mode `rounding`.\r\n   *\r\n   */\r\n  P.dividedBy = P.div = function (y) {\r\n    return divide(this, new this.constructor(y));\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the integer part of dividing the value of this Decimal\r\n   * by the value of `y`, rounded to `precision` significant digits using rounding mode `rounding`.\r\n   *\r\n   */\r\n  P.dividedToIntegerBy = P.divToInt = function (y) {\r\n    var x = this,\r\n      Ctor = x.constructor;\r\n    return finalise(divide(x, new Ctor(y), 0, 1, 1), Ctor.precision, Ctor.rounding);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return true if the value of this Decimal is equal to the value of `y`, otherwise return false.\r\n   *\r\n   */\r\n  P.equals = P.eq = function (y) {\r\n    return this.cmp(y) === 0;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the value of this Decimal rounded to a whole number in the\r\n   * direction of negative Infinity.\r\n   *\r\n   */\r\n  P.floor = function () {\r\n    return finalise(new this.constructor(this), this.e + 1, 3);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return true if the value of this Decimal is greater than the value of `y`, otherwise return\r\n   * false.\r\n   *\r\n   */\r\n  P.greaterThan = P.gt = function (y) {\r\n    return this.cmp(y) > 0;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return true if the value of this Decimal is greater than or equal to the value of `y`,\r\n   * otherwise return false.\r\n   *\r\n   */\r\n  P.greaterThanOrEqualTo = P.gte = function (y) {\r\n    var k = this.cmp(y);\r\n    return k == 1 || k === 0;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the hyperbolic cosine of the value in radians of this\r\n   * Decimal.\r\n   *\r\n   * Domain: [-Infinity, Infinity]\r\n   * Range: [1, Infinity]\r\n   *\r\n   * cosh(x) = 1 + x^2/2! + x^4/4! + x^6/6! + ...\r\n   *\r\n   * cosh(0)         = 1\r\n   * cosh(-0)        = 1\r\n   * cosh(Infinity)  = Infinity\r\n   * cosh(-Infinity) = Infinity\r\n   * cosh(NaN)       = NaN\r\n   *\r\n   *  x        time taken (ms)   result\r\n   * 1000      9                 9.8503555700852349694e+433\r\n   * 10000     25                4.4034091128314607936e+4342\r\n   * 100000    171               1.4033316802130615897e+43429\r\n   * 1000000   3817              1.5166076984010437725e+434294\r\n   * 10000000  abandoned after 2 minute wait\r\n   *\r\n   * TODO? Compare performance of cosh(x) = 0.5 * (exp(x) + exp(-x))\r\n   *\r\n   */\r\n  P.hyperbolicCosine = P.cosh = function () {\r\n    var k, n, pr, rm, len,\r\n      x = this,\r\n      Ctor = x.constructor,\r\n      one = new Ctor(1);\r\n\r\n    if (!x.isFinite()) return new Ctor(x.s ? 1 / 0 : NaN);\r\n    if (x.isZero()) return one;\r\n\r\n    pr = Ctor.precision;\r\n    rm = Ctor.rounding;\r\n    Ctor.precision = pr + Math.max(x.e, x.sd()) + 4;\r\n    Ctor.rounding = 1;\r\n    len = x.d.length;\r\n\r\n    // Argument reduction: cos(4x) = 1 - 8cos^2(x) + 8cos^4(x) + 1\r\n    // i.e. cos(x) = 1 - cos^2(x/4)(8 - 8cos^2(x/4))\r\n\r\n    // Estimate the optimum number of times to use the argument reduction.\r\n    // TODO? Estimation reused from cosine() and may not be optimal here.\r\n    if (len < 32) {\r\n      k = Math.ceil(len / 3);\r\n      n = (1 / tinyPow(4, k)).toString();\r\n    } else {\r\n      k = 16;\r\n      n = '2.3283064365386962890625e-10';\r\n    }\r\n\r\n    x = taylorSeries(Ctor, 1, x.times(n), new Ctor(1), true);\r\n\r\n    // Reverse argument reduction\r\n    var cosh2_x,\r\n      i = k,\r\n      d8 = new Ctor(8);\r\n    for (; i--;) {\r\n      cosh2_x = x.times(x);\r\n      x = one.minus(cosh2_x.times(d8.minus(cosh2_x.times(d8))));\r\n    }\r\n\r\n    return finalise(x, Ctor.precision = pr, Ctor.rounding = rm, true);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the hyperbolic sine of the value in radians of this\r\n   * Decimal.\r\n   *\r\n   * Domain: [-Infinity, Infinity]\r\n   * Range: [-Infinity, Infinity]\r\n   *\r\n   * sinh(x) = x + x^3/3! + x^5/5! + x^7/7! + ...\r\n   *\r\n   * sinh(0)         = 0\r\n   * sinh(-0)        = -0\r\n   * sinh(Infinity)  = Infinity\r\n   * sinh(-Infinity) = -Infinity\r\n   * sinh(NaN)       = NaN\r\n   *\r\n   * x        time taken (ms)\r\n   * 10       2 ms\r\n   * 100      5 ms\r\n   * 1000     14 ms\r\n   * 10000    82 ms\r\n   * 100000   886 ms            1.4033316802130615897e+43429\r\n   * 200000   2613 ms\r\n   * 300000   5407 ms\r\n   * 400000   8824 ms\r\n   * 500000   13026 ms          8.7080643612718084129e+217146\r\n   * 1000000  48543 ms\r\n   *\r\n   * TODO? Compare performance of sinh(x) = 0.5 * (exp(x) - exp(-x))\r\n   *\r\n   */\r\n  P.hyperbolicSine = P.sinh = function () {\r\n    var k, pr, rm, len,\r\n      x = this,\r\n      Ctor = x.constructor;\r\n\r\n    if (!x.isFinite() || x.isZero()) return new Ctor(x);\r\n\r\n    pr = Ctor.precision;\r\n    rm = Ctor.rounding;\r\n    Ctor.precision = pr + Math.max(x.e, x.sd()) + 4;\r\n    Ctor.rounding = 1;\r\n    len = x.d.length;\r\n\r\n    if (len < 3) {\r\n      x = taylorSeries(Ctor, 2, x, x, true);\r\n    } else {\r\n\r\n      // Alternative argument reduction: sinh(3x) = sinh(x)(3 + 4sinh^2(x))\r\n      // i.e. sinh(x) = sinh(x/3)(3 + 4sinh^2(x/3))\r\n      // 3 multiplications and 1 addition\r\n\r\n      // Argument reduction: sinh(5x) = sinh(x)(5 + sinh^2(x)(20 + 16sinh^2(x)))\r\n      // i.e. sinh(x) = sinh(x/5)(5 + sinh^2(x/5)(20 + 16sinh^2(x/5)))\r\n      // 4 multiplications and 2 additions\r\n\r\n      // Estimate the optimum number of times to use the argument reduction.\r\n      k = 1.4 * Math.sqrt(len);\r\n      k = k > 16 ? 16 : k | 0;\r\n\r\n      x = x.times(1 / tinyPow(5, k));\r\n      x = taylorSeries(Ctor, 2, x, x, true);\r\n\r\n      // Reverse argument reduction\r\n      var sinh2_x,\r\n        d5 = new Ctor(5),\r\n        d16 = new Ctor(16),\r\n        d20 = new Ctor(20);\r\n      for (; k--;) {\r\n        sinh2_x = x.times(x);\r\n        x = x.times(d5.plus(sinh2_x.times(d16.times(sinh2_x).plus(d20))));\r\n      }\r\n    }\r\n\r\n    Ctor.precision = pr;\r\n    Ctor.rounding = rm;\r\n\r\n    return finalise(x, pr, rm, true);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the hyperbolic tangent of the value in radians of this\r\n   * Decimal.\r\n   *\r\n   * Domain: [-Infinity, Infinity]\r\n   * Range: [-1, 1]\r\n   *\r\n   * tanh(x) = sinh(x) / cosh(x)\r\n   *\r\n   * tanh(0)         = 0\r\n   * tanh(-0)        = -0\r\n   * tanh(Infinity)  = 1\r\n   * tanh(-Infinity) = -1\r\n   * tanh(NaN)       = NaN\r\n   *\r\n   */\r\n  P.hyperbolicTangent = P.tanh = function () {\r\n    var pr, rm,\r\n      x = this,\r\n      Ctor = x.constructor;\r\n\r\n    if (!x.isFinite()) return new Ctor(x.s);\r\n    if (x.isZero()) return new Ctor(x);\r\n\r\n    pr = Ctor.precision;\r\n    rm = Ctor.rounding;\r\n    Ctor.precision = pr + 7;\r\n    Ctor.rounding = 1;\r\n\r\n    return divide(x.sinh(), x.cosh(), Ctor.precision = pr, Ctor.rounding = rm);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the arccosine (inverse cosine) in radians of the value of\r\n   * this Decimal.\r\n   *\r\n   * Domain: [-1, 1]\r\n   * Range: [0, pi]\r\n   *\r\n   * acos(x) = pi/2 - asin(x)\r\n   *\r\n   * acos(0)       = pi/2\r\n   * acos(-0)      = pi/2\r\n   * acos(1)       = 0\r\n   * acos(-1)      = pi\r\n   * acos(1/2)     = pi/3\r\n   * acos(-1/2)    = 2*pi/3\r\n   * acos(|x| > 1) = NaN\r\n   * acos(NaN)     = NaN\r\n   *\r\n   */\r\n  P.inverseCosine = P.acos = function () {\r\n    var halfPi,\r\n      x = this,\r\n      Ctor = x.constructor,\r\n      k = x.abs().cmp(1),\r\n      pr = Ctor.precision,\r\n      rm = Ctor.rounding;\r\n\r\n    if (k !== -1) {\r\n      return k === 0\r\n        // |x| is 1\r\n        ? x.isNeg() ? getPi(Ctor, pr, rm) : new Ctor(0)\r\n        // |x| > 1 or x is NaN\r\n        : new Ctor(NaN);\r\n    }\r\n\r\n    if (x.isZero()) return getPi(Ctor, pr + 4, rm).times(0.5);\r\n\r\n    // TODO? Special case acos(0.5) = pi/3 and acos(-0.5) = 2*pi/3\r\n\r\n    Ctor.precision = pr + 6;\r\n    Ctor.rounding = 1;\r\n\r\n    x = x.asin();\r\n    halfPi = getPi(Ctor, pr + 4, rm).times(0.5);\r\n\r\n    Ctor.precision = pr;\r\n    Ctor.rounding = rm;\r\n\r\n    return halfPi.minus(x);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the inverse of the hyperbolic cosine in radians of the\r\n   * value of this Decimal.\r\n   *\r\n   * Domain: [1, Infinity]\r\n   * Range: [0, Infinity]\r\n   *\r\n   * acosh(x) = ln(x + sqrt(x^2 - 1))\r\n   *\r\n   * acosh(x < 1)     = NaN\r\n   * acosh(NaN)       = NaN\r\n   * acosh(Infinity)  = Infinity\r\n   * acosh(-Infinity) = NaN\r\n   * acosh(0)         = NaN\r\n   * acosh(-0)        = NaN\r\n   * acosh(1)         = 0\r\n   * acosh(-1)        = NaN\r\n   *\r\n   */\r\n  P.inverseHyperbolicCosine = P.acosh = function () {\r\n    var pr, rm,\r\n      x = this,\r\n      Ctor = x.constructor;\r\n\r\n    if (x.lte(1)) return new Ctor(x.eq(1) ? 0 : NaN);\r\n    if (!x.isFinite()) return new Ctor(x);\r\n\r\n    pr = Ctor.precision;\r\n    rm = Ctor.rounding;\r\n    Ctor.precision = pr + Math.max(Math.abs(x.e), x.sd()) + 4;\r\n    Ctor.rounding = 1;\r\n    external = false;\r\n\r\n    x = x.times(x).minus(1).sqrt().plus(x);\r\n\r\n    external = true;\r\n    Ctor.precision = pr;\r\n    Ctor.rounding = rm;\r\n\r\n    return x.ln();\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the inverse of the hyperbolic sine in radians of the value\r\n   * of this Decimal.\r\n   *\r\n   * Domain: [-Infinity, Infinity]\r\n   * Range: [-Infinity, Infinity]\r\n   *\r\n   * asinh(x) = ln(x + sqrt(x^2 + 1))\r\n   *\r\n   * asinh(NaN)       = NaN\r\n   * asinh(Infinity)  = Infinity\r\n   * asinh(-Infinity) = -Infinity\r\n   * asinh(0)         = 0\r\n   * asinh(-0)        = -0\r\n   *\r\n   */\r\n  P.inverseHyperbolicSine = P.asinh = function () {\r\n    var pr, rm,\r\n      x = this,\r\n      Ctor = x.constructor;\r\n\r\n    if (!x.isFinite() || x.isZero()) return new Ctor(x);\r\n\r\n    pr = Ctor.precision;\r\n    rm = Ctor.rounding;\r\n    Ctor.precision = pr + 2 * Math.max(Math.abs(x.e), x.sd()) + 6;\r\n    Ctor.rounding = 1;\r\n    external = false;\r\n\r\n    x = x.times(x).plus(1).sqrt().plus(x);\r\n\r\n    external = true;\r\n    Ctor.precision = pr;\r\n    Ctor.rounding = rm;\r\n\r\n    return x.ln();\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the inverse of the hyperbolic tangent in radians of the\r\n   * value of this Decimal.\r\n   *\r\n   * Domain: [-1, 1]\r\n   * Range: [-Infinity, Infinity]\r\n   *\r\n   * atanh(x) = 0.5 * ln((1 + x) / (1 - x))\r\n   *\r\n   * atanh(|x| > 1)   = NaN\r\n   * atanh(NaN)       = NaN\r\n   * atanh(Infinity)  = NaN\r\n   * atanh(-Infinity) = NaN\r\n   * atanh(0)         = 0\r\n   * atanh(-0)        = -0\r\n   * atanh(1)         = Infinity\r\n   * atanh(-1)        = -Infinity\r\n   *\r\n   */\r\n  P.inverseHyperbolicTangent = P.atanh = function () {\r\n    var pr, rm, wpr, xsd,\r\n      x = this,\r\n      Ctor = x.constructor;\r\n\r\n    if (!x.isFinite()) return new Ctor(NaN);\r\n    if (x.e >= 0) return new Ctor(x.abs().eq(1) ? x.s / 0 : x.isZero() ? x : NaN);\r\n\r\n    pr = Ctor.precision;\r\n    rm = Ctor.rounding;\r\n    xsd = x.sd();\r\n\r\n    if (Math.max(xsd, pr) < 2 * -x.e - 1) return finalise(new Ctor(x), pr, rm, true);\r\n\r\n    Ctor.precision = wpr = xsd - x.e;\r\n\r\n    x = divide(x.plus(1), new Ctor(1).minus(x), wpr + pr, 1);\r\n\r\n    Ctor.precision = pr + 4;\r\n    Ctor.rounding = 1;\r\n\r\n    x = x.ln();\r\n\r\n    Ctor.precision = pr;\r\n    Ctor.rounding = rm;\r\n\r\n    return x.times(0.5);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the arcsine (inverse sine) in radians of the value of this\r\n   * Decimal.\r\n   *\r\n   * Domain: [-Infinity, Infinity]\r\n   * Range: [-pi/2, pi/2]\r\n   *\r\n   * asin(x) = 2*atan(x/(1 + sqrt(1 - x^2)))\r\n   *\r\n   * asin(0)       = 0\r\n   * asin(-0)      = -0\r\n   * asin(1/2)     = pi/6\r\n   * asin(-1/2)    = -pi/6\r\n   * asin(1)       = pi/2\r\n   * asin(-1)      = -pi/2\r\n   * asin(|x| > 1) = NaN\r\n   * asin(NaN)     = NaN\r\n   *\r\n   * TODO? Compare performance of Taylor series.\r\n   *\r\n   */\r\n  P.inverseSine = P.asin = function () {\r\n    var halfPi, k,\r\n      pr, rm,\r\n      x = this,\r\n      Ctor = x.constructor;\r\n\r\n    if (x.isZero()) return new Ctor(x);\r\n\r\n    k = x.abs().cmp(1);\r\n    pr = Ctor.precision;\r\n    rm = Ctor.rounding;\r\n\r\n    if (k !== -1) {\r\n\r\n      // |x| is 1\r\n      if (k === 0) {\r\n        halfPi = getPi(Ctor, pr + 4, rm).times(0.5);\r\n        halfPi.s = x.s;\r\n        return halfPi;\r\n      }\r\n\r\n      // |x| > 1 or x is NaN\r\n      return new Ctor(NaN);\r\n    }\r\n\r\n    // TODO? Special case asin(1/2) = pi/6 and asin(-1/2) = -pi/6\r\n\r\n    Ctor.precision = pr + 6;\r\n    Ctor.rounding = 1;\r\n\r\n    x = x.div(new Ctor(1).minus(x.times(x)).sqrt().plus(1)).atan();\r\n\r\n    Ctor.precision = pr;\r\n    Ctor.rounding = rm;\r\n\r\n    return x.times(2);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the arctangent (inverse tangent) in radians of the value\r\n   * of this Decimal.\r\n   *\r\n   * Domain: [-Infinity, Infinity]\r\n   * Range: [-pi/2, pi/2]\r\n   *\r\n   * atan(x) = x - x^3/3 + x^5/5 - x^7/7 + ...\r\n   *\r\n   * atan(0)         = 0\r\n   * atan(-0)        = -0\r\n   * atan(1)         = pi/4\r\n   * atan(-1)        = -pi/4\r\n   * atan(Infinity)  = pi/2\r\n   * atan(-Infinity) = -pi/2\r\n   * atan(NaN)       = NaN\r\n   *\r\n   */\r\n  P.inverseTangent = P.atan = function () {\r\n    var i, j, k, n, px, t, r, wpr, x2,\r\n      x = this,\r\n      Ctor = x.constructor,\r\n      pr = Ctor.precision,\r\n      rm = Ctor.rounding;\r\n\r\n    if (!x.isFinite()) {\r\n      if (!x.s) return new Ctor(NaN);\r\n      if (pr + 4 <= PI_PRECISION) {\r\n        r = getPi(Ctor, pr + 4, rm).times(0.5);\r\n        r.s = x.s;\r\n        return r;\r\n      }\r\n    } else if (x.isZero()) {\r\n      return new Ctor(x);\r\n    } else if (x.abs().eq(1) && pr + 4 <= PI_PRECISION) {\r\n      r = getPi(Ctor, pr + 4, rm).times(0.25);\r\n      r.s = x.s;\r\n      return r;\r\n    }\r\n\r\n    Ctor.precision = wpr = pr + 10;\r\n    Ctor.rounding = 1;\r\n\r\n    // TODO? if (x >= 1 && pr <= PI_PRECISION) atan(x) = halfPi * x.s - atan(1 / x);\r\n\r\n    // Argument reduction\r\n    // Ensure |x| < 0.42\r\n    // atan(x) = 2 * atan(x / (1 + sqrt(1 + x^2)))\r\n\r\n    k = Math.min(28, wpr / LOG_BASE + 2 | 0);\r\n\r\n    for (i = k; i; --i) x = x.div(x.times(x).plus(1).sqrt().plus(1));\r\n\r\n    external = false;\r\n\r\n    j = Math.ceil(wpr / LOG_BASE);\r\n    n = 1;\r\n    x2 = x.times(x);\r\n    r = new Ctor(x);\r\n    px = x;\r\n\r\n    // atan(x) = x - x^3/3 + x^5/5 - x^7/7 + ...\r\n    for (; i !== -1;) {\r\n      px = px.times(x2);\r\n      t = r.minus(px.div(n += 2));\r\n\r\n      px = px.times(x2);\r\n      r = t.plus(px.div(n += 2));\r\n\r\n      if (r.d[j] !== void 0) for (i = j; r.d[i] === t.d[i] && i--;);\r\n    }\r\n\r\n    if (k) r = r.times(2 << (k - 1));\r\n\r\n    external = true;\r\n\r\n    return finalise(r, Ctor.precision = pr, Ctor.rounding = rm, true);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return true if the value of this Decimal is a finite number, otherwise return false.\r\n   *\r\n   */\r\n  P.isFinite = function () {\r\n    return !!this.d;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return true if the value of this Decimal is an integer, otherwise return false.\r\n   *\r\n   */\r\n  P.isInteger = P.isInt = function () {\r\n    return !!this.d && mathfloor(this.e / LOG_BASE) > this.d.length - 2;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return true if the value of this Decimal is NaN, otherwise return false.\r\n   *\r\n   */\r\n  P.isNaN = function () {\r\n    return !this.s;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return true if the value of this Decimal is negative, otherwise return false.\r\n   *\r\n   */\r\n  P.isNegative = P.isNeg = function () {\r\n    return this.s < 0;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return true if the value of this Decimal is positive, otherwise return false.\r\n   *\r\n   */\r\n  P.isPositive = P.isPos = function () {\r\n    return this.s > 0;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return true if the value of this Decimal is 0 or -0, otherwise return false.\r\n   *\r\n   */\r\n  P.isZero = function () {\r\n    return !!this.d && this.d[0] === 0;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return true if the value of this Decimal is less than `y`, otherwise return false.\r\n   *\r\n   */\r\n  P.lessThan = P.lt = function (y) {\r\n    return this.cmp(y) < 0;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return true if the value of this Decimal is less than or equal to `y`, otherwise return false.\r\n   *\r\n   */\r\n  P.lessThanOrEqualTo = P.lte = function (y) {\r\n    return this.cmp(y) < 1;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return the logarithm of the value of this Decimal to the specified base, rounded to `precision`\r\n   * significant digits using rounding mode `rounding`.\r\n   *\r\n   * If no base is specified, return log[10](arg).\r\n   *\r\n   * log[base](arg) = ln(arg) / ln(base)\r\n   *\r\n   * The result will always be correctly rounded if the base of the log is 10, and 'almost always'\r\n   * otherwise:\r\n   *\r\n   * Depending on the rounding mode, the result may be incorrectly rounded if the first fifteen\r\n   * rounding digits are [49]99999999999999 or [50]00000000000000. In that case, the maximum error\r\n   * between the result and the correctly rounded result will be one ulp (unit in the last place).\r\n   *\r\n   * log[-b](a)       = NaN\r\n   * log[0](a)        = NaN\r\n   * log[1](a)        = NaN\r\n   * log[NaN](a)      = NaN\r\n   * log[Infinity](a) = NaN\r\n   * log[b](0)        = -Infinity\r\n   * log[b](-0)       = -Infinity\r\n   * log[b](-a)       = NaN\r\n   * log[b](1)        = 0\r\n   * log[b](Infinity) = Infinity\r\n   * log[b](NaN)      = NaN\r\n   *\r\n   * [base] {number|string|Decimal} The base of the logarithm.\r\n   *\r\n   */\r\n  P.logarithm = P.log = function (base) {\r\n    var isBase10, d, denominator, k, inf, num, sd, r,\r\n      arg = this,\r\n      Ctor = arg.constructor,\r\n      pr = Ctor.precision,\r\n      rm = Ctor.rounding,\r\n      guard = 5;\r\n\r\n    // Default base is 10.\r\n    if (base == null) {\r\n      base = new Ctor(10);\r\n      isBase10 = true;\r\n    } else {\r\n      base = new Ctor(base);\r\n      d = base.d;\r\n\r\n      // Return NaN if base is negative, or non-finite, or is 0 or 1.\r\n      if (base.s < 0 || !d || !d[0] || base.eq(1)) return new Ctor(NaN);\r\n\r\n      isBase10 = base.eq(10);\r\n    }\r\n\r\n    d = arg.d;\r\n\r\n    // Is arg negative, non-finite, 0 or 1?\r\n    if (arg.s < 0 || !d || !d[0] || arg.eq(1)) {\r\n      return new Ctor(d && !d[0] ? -1 / 0 : arg.s != 1 ? NaN : d ? 0 : 1 / 0);\r\n    }\r\n\r\n    // The result will have a non-terminating decimal expansion if base is 10 and arg is not an\r\n    // integer power of 10.\r\n    if (isBase10) {\r\n      if (d.length > 1) {\r\n        inf = true;\r\n      } else {\r\n        for (k = d[0]; k % 10 === 0;) k /= 10;\r\n        inf = k !== 1;\r\n      }\r\n    }\r\n\r\n    external = false;\r\n    sd = pr + guard;\r\n    num = naturalLogarithm(arg, sd);\r\n    denominator = isBase10 ? getLn10(Ctor, sd + 10) : naturalLogarithm(base, sd);\r\n\r\n    // The result will have 5 rounding digits.\r\n    r = divide(num, denominator, sd, 1);\r\n\r\n    // If at a rounding boundary, i.e. the result's rounding digits are [49]9999 or [50]0000,\r\n    // calculate 10 further digits.\r\n    //\r\n    // If the result is known to have an infinite decimal expansion, repeat this until it is clear\r\n    // that the result is above or below the boundary. Otherwise, if after calculating the 10\r\n    // further digits, the last 14 are nines, round up and assume the result is exact.\r\n    // Also assume the result is exact if the last 14 are zero.\r\n    //\r\n    // Example of a result that will be incorrectly rounded:\r\n    // log[1048576](4503599627370502) = 2.60000000000000009610279511444746...\r\n    // The above result correctly rounded using ROUND_CEIL to 1 decimal place should be 2.7, but it\r\n    // will be given as 2.6 as there are 15 zeros immediately after the requested decimal place, so\r\n    // the exact result would be assumed to be 2.6, which rounded using ROUND_CEIL to 1 decimal\r\n    // place is still 2.6.\r\n    if (checkRoundingDigits(r.d, k = pr, rm)) {\r\n\r\n      do {\r\n        sd += 10;\r\n        num = naturalLogarithm(arg, sd);\r\n        denominator = isBase10 ? getLn10(Ctor, sd + 10) : naturalLogarithm(base, sd);\r\n        r = divide(num, denominator, sd, 1);\r\n\r\n        if (!inf) {\r\n\r\n          // Check for 14 nines from the 2nd rounding digit, as the first may be 4.\r\n          if (+digitsToString(r.d).slice(k + 1, k + 15) + 1 == 1e14) {\r\n            r = finalise(r, pr + 1, 0);\r\n          }\r\n\r\n          break;\r\n        }\r\n      } while (checkRoundingDigits(r.d, k += 10, rm));\r\n    }\r\n\r\n    external = true;\r\n\r\n    return finalise(r, pr, rm);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the maximum of the arguments and the value of this Decimal.\r\n   *\r\n   * arguments {number|string|Decimal}\r\n   *\r\n  P.max = function () {\r\n    Array.prototype.push.call(arguments, this);\r\n    return maxOrMin(this.constructor, arguments, 'lt');\r\n  };\r\n   */\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the minimum of the arguments and the value of this Decimal.\r\n   *\r\n   * arguments {number|string|Decimal}\r\n   *\r\n  P.min = function () {\r\n    Array.prototype.push.call(arguments, this);\r\n    return maxOrMin(this.constructor, arguments, 'gt');\r\n  };\r\n   */\r\n\r\n\r\n  /*\r\n   *  n - 0 = n\r\n   *  n - N = N\r\n   *  n - I = -I\r\n   *  0 - n = -n\r\n   *  0 - 0 = 0\r\n   *  0 - N = N\r\n   *  0 - I = -I\r\n   *  N - n = N\r\n   *  N - 0 = N\r\n   *  N - N = N\r\n   *  N - I = N\r\n   *  I - n = I\r\n   *  I - 0 = I\r\n   *  I - N = N\r\n   *  I - I = N\r\n   *\r\n   * Return a new Decimal whose value is the value of this Decimal minus `y`, rounded to `precision`\r\n   * significant digits using rounding mode `rounding`.\r\n   *\r\n   */\r\n  P.minus = P.sub = function (y) {\r\n    var d, e, i, j, k, len, pr, rm, xd, xe, xLTy, yd,\r\n      x = this,\r\n      Ctor = x.constructor;\r\n\r\n    y = new Ctor(y);\r\n\r\n    // If either is not finite...\r\n    if (!x.d || !y.d) {\r\n\r\n      // Return NaN if either is NaN.\r\n      if (!x.s || !y.s) y = new Ctor(NaN);\r\n\r\n      // Return y negated if x is finite and y is ±Infinity.\r\n      else if (x.d) y.s = -y.s;\r\n\r\n      // Return x if y is finite and x is ±Infinity.\r\n      // Return x if both are ±Infinity with different signs.\r\n      // Return NaN if both are ±Infinity with the same sign.\r\n      else y = new Ctor(y.d || x.s !== y.s ? x : NaN);\r\n\r\n      return y;\r\n    }\r\n\r\n    // If signs differ...\r\n    if (x.s != y.s) {\r\n      y.s = -y.s;\r\n      return x.plus(y);\r\n    }\r\n\r\n    xd = x.d;\r\n    yd = y.d;\r\n    pr = Ctor.precision;\r\n    rm = Ctor.rounding;\r\n\r\n    // If either is zero...\r\n    if (!xd[0] || !yd[0]) {\r\n\r\n      // Return y negated if x is zero and y is non-zero.\r\n      if (yd[0]) y.s = -y.s;\r\n\r\n      // Return x if y is zero and x is non-zero.\r\n      else if (xd[0]) y = new Ctor(x);\r\n\r\n      // Return zero if both are zero.\r\n      // From IEEE 754 (2008) 6.3: 0 - 0 = -0 - -0 = -0 when rounding to -Infinity.\r\n      else return new Ctor(rm === 3 ? -0 : 0);\r\n\r\n      return external ? finalise(y, pr, rm) : y;\r\n    }\r\n\r\n    // x and y are finite, non-zero numbers with the same sign.\r\n\r\n    // Calculate base 1e7 exponents.\r\n    e = mathfloor(y.e / LOG_BASE);\r\n    xe = mathfloor(x.e / LOG_BASE);\r\n\r\n    xd = xd.slice();\r\n    k = xe - e;\r\n\r\n    // If base 1e7 exponents differ...\r\n    if (k) {\r\n      xLTy = k < 0;\r\n\r\n      if (xLTy) {\r\n        d = xd;\r\n        k = -k;\r\n        len = yd.length;\r\n      } else {\r\n        d = yd;\r\n        e = xe;\r\n        len = xd.length;\r\n      }\r\n\r\n      // Numbers with massively different exponents would result in a very high number of\r\n      // zeros needing to be prepended, but this can be avoided while still ensuring correct\r\n      // rounding by limiting the number of zeros to `Math.ceil(pr / LOG_BASE) + 2`.\r\n      i = Math.max(Math.ceil(pr / LOG_BASE), len) + 2;\r\n\r\n      if (k > i) {\r\n        k = i;\r\n        d.length = 1;\r\n      }\r\n\r\n      // Prepend zeros to equalise exponents.\r\n      d.reverse();\r\n      for (i = k; i--;) d.push(0);\r\n      d.reverse();\r\n\r\n    // Base 1e7 exponents equal.\r\n    } else {\r\n\r\n      // Check digits to determine which is the bigger number.\r\n\r\n      i = xd.length;\r\n      len = yd.length;\r\n      xLTy = i < len;\r\n      if (xLTy) len = i;\r\n\r\n      for (i = 0; i < len; i++) {\r\n        if (xd[i] != yd[i]) {\r\n          xLTy = xd[i] < yd[i];\r\n          break;\r\n        }\r\n      }\r\n\r\n      k = 0;\r\n    }\r\n\r\n    if (xLTy) {\r\n      d = xd;\r\n      xd = yd;\r\n      yd = d;\r\n      y.s = -y.s;\r\n    }\r\n\r\n    len = xd.length;\r\n\r\n    // Append zeros to `xd` if shorter.\r\n    // Don't add zeros to `yd` if shorter as subtraction only needs to start at `yd` length.\r\n    for (i = yd.length - len; i > 0; --i) xd[len++] = 0;\r\n\r\n    // Subtract yd from xd.\r\n    for (i = yd.length; i > k;) {\r\n\r\n      if (xd[--i] < yd[i]) {\r\n        for (j = i; j && xd[--j] === 0;) xd[j] = BASE - 1;\r\n        --xd[j];\r\n        xd[i] += BASE;\r\n      }\r\n\r\n      xd[i] -= yd[i];\r\n    }\r\n\r\n    // Remove trailing zeros.\r\n    for (; xd[--len] === 0;) xd.pop();\r\n\r\n    // Remove leading zeros and adjust exponent accordingly.\r\n    for (; xd[0] === 0; xd.shift()) --e;\r\n\r\n    // Zero?\r\n    if (!xd[0]) return new Ctor(rm === 3 ? -0 : 0);\r\n\r\n    y.d = xd;\r\n    y.e = getBase10Exponent(xd, e);\r\n\r\n    return external ? finalise(y, pr, rm) : y;\r\n  };\r\n\r\n\r\n  /*\r\n   *   n % 0 =  N\r\n   *   n % N =  N\r\n   *   n % I =  n\r\n   *   0 % n =  0\r\n   *  -0 % n = -0\r\n   *   0 % 0 =  N\r\n   *   0 % N =  N\r\n   *   0 % I =  0\r\n   *   N % n =  N\r\n   *   N % 0 =  N\r\n   *   N % N =  N\r\n   *   N % I =  N\r\n   *   I % n =  N\r\n   *   I % 0 =  N\r\n   *   I % N =  N\r\n   *   I % I =  N\r\n   *\r\n   * Return a new Decimal whose value is the value of this Decimal modulo `y`, rounded to\r\n   * `precision` significant digits using rounding mode `rounding`.\r\n   *\r\n   * The result depends on the modulo mode.\r\n   *\r\n   */\r\n  P.modulo = P.mod = function (y) {\r\n    var q,\r\n      x = this,\r\n      Ctor = x.constructor;\r\n\r\n    y = new Ctor(y);\r\n\r\n    // Return NaN if x is ±Infinity or NaN, or y is NaN or ±0.\r\n    if (!x.d || !y.s || y.d && !y.d[0]) return new Ctor(NaN);\r\n\r\n    // Return x if y is ±Infinity or x is ±0.\r\n    if (!y.d || x.d && !x.d[0]) {\r\n      return finalise(new Ctor(x), Ctor.precision, Ctor.rounding);\r\n    }\r\n\r\n    // Prevent rounding of intermediate calculations.\r\n    external = false;\r\n\r\n    if (Ctor.modulo == 9) {\r\n\r\n      // Euclidian division: q = sign(y) * floor(x / abs(y))\r\n      // result = x - q * y    where  0 <= result < abs(y)\r\n      q = divide(x, y.abs(), 0, 3, 1);\r\n      q.s *= y.s;\r\n    } else {\r\n      q = divide(x, y, 0, Ctor.modulo, 1);\r\n    }\r\n\r\n    q = q.times(y);\r\n\r\n    external = true;\r\n\r\n    return x.minus(q);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the natural exponential of the value of this Decimal,\r\n   * i.e. the base e raised to the power the value of this Decimal, rounded to `precision`\r\n   * significant digits using rounding mode `rounding`.\r\n   *\r\n   */\r\n  P.naturalExponential = P.exp = function () {\r\n    return naturalExponential(this);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the natural logarithm of the value of this Decimal,\r\n   * rounded to `precision` significant digits using rounding mode `rounding`.\r\n   *\r\n   */\r\n  P.naturalLogarithm = P.ln = function () {\r\n    return naturalLogarithm(this);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the value of this Decimal negated, i.e. as if multiplied by\r\n   * -1.\r\n   *\r\n   */\r\n  P.negated = P.neg = function () {\r\n    var x = new this.constructor(this);\r\n    x.s = -x.s;\r\n    return finalise(x);\r\n  };\r\n\r\n\r\n  /*\r\n   *  n + 0 = n\r\n   *  n + N = N\r\n   *  n + I = I\r\n   *  0 + n = n\r\n   *  0 + 0 = 0\r\n   *  0 + N = N\r\n   *  0 + I = I\r\n   *  N + n = N\r\n   *  N + 0 = N\r\n   *  N + N = N\r\n   *  N + I = N\r\n   *  I + n = I\r\n   *  I + 0 = I\r\n   *  I + N = N\r\n   *  I + I = I\r\n   *\r\n   * Return a new Decimal whose value is the value of this Decimal plus `y`, rounded to `precision`\r\n   * significant digits using rounding mode `rounding`.\r\n   *\r\n   */\r\n  P.plus = P.add = function (y) {\r\n    var carry, d, e, i, k, len, pr, rm, xd, yd,\r\n      x = this,\r\n      Ctor = x.constructor;\r\n\r\n    y = new Ctor(y);\r\n\r\n    // If either is not finite...\r\n    if (!x.d || !y.d) {\r\n\r\n      // Return NaN if either is NaN.\r\n      if (!x.s || !y.s) y = new Ctor(NaN);\r\n\r\n      // Return x if y is finite and x is ±Infinity.\r\n      // Return x if both are ±Infinity with the same sign.\r\n      // Return NaN if both are ±Infinity with different signs.\r\n      // Return y if x is finite and y is ±Infinity.\r\n      else if (!x.d) y = new Ctor(y.d || x.s === y.s ? x : NaN);\r\n\r\n      return y;\r\n    }\r\n\r\n     // If signs differ...\r\n    if (x.s != y.s) {\r\n      y.s = -y.s;\r\n      return x.minus(y);\r\n    }\r\n\r\n    xd = x.d;\r\n    yd = y.d;\r\n    pr = Ctor.precision;\r\n    rm = Ctor.rounding;\r\n\r\n    // If either is zero...\r\n    if (!xd[0] || !yd[0]) {\r\n\r\n      // Return x if y is zero.\r\n      // Return y if y is non-zero.\r\n      if (!yd[0]) y = new Ctor(x);\r\n\r\n      return external ? finalise(y, pr, rm) : y;\r\n    }\r\n\r\n    // x and y are finite, non-zero numbers with the same sign.\r\n\r\n    // Calculate base 1e7 exponents.\r\n    k = mathfloor(x.e / LOG_BASE);\r\n    e = mathfloor(y.e / LOG_BASE);\r\n\r\n    xd = xd.slice();\r\n    i = k - e;\r\n\r\n    // If base 1e7 exponents differ...\r\n    if (i) {\r\n\r\n      if (i < 0) {\r\n        d = xd;\r\n        i = -i;\r\n        len = yd.length;\r\n      } else {\r\n        d = yd;\r\n        e = k;\r\n        len = xd.length;\r\n      }\r\n\r\n      // Limit number of zeros prepended to max(ceil(pr / LOG_BASE), len) + 1.\r\n      k = Math.ceil(pr / LOG_BASE);\r\n      len = k > len ? k + 1 : len + 1;\r\n\r\n      if (i > len) {\r\n        i = len;\r\n        d.length = 1;\r\n      }\r\n\r\n      // Prepend zeros to equalise exponents. Note: Faster to use reverse then do unshifts.\r\n      d.reverse();\r\n      for (; i--;) d.push(0);\r\n      d.reverse();\r\n    }\r\n\r\n    len = xd.length;\r\n    i = yd.length;\r\n\r\n    // If yd is longer than xd, swap xd and yd so xd points to the longer array.\r\n    if (len - i < 0) {\r\n      i = len;\r\n      d = yd;\r\n      yd = xd;\r\n      xd = d;\r\n    }\r\n\r\n    // Only start adding at yd.length - 1 as the further digits of xd can be left as they are.\r\n    for (carry = 0; i;) {\r\n      carry = (xd[--i] = xd[i] + yd[i] + carry) / BASE | 0;\r\n      xd[i] %= BASE;\r\n    }\r\n\r\n    if (carry) {\r\n      xd.unshift(carry);\r\n      ++e;\r\n    }\r\n\r\n    // Remove trailing zeros.\r\n    // No need to check for zero, as +x + +y != 0 && -x + -y != 0\r\n    for (len = xd.length; xd[--len] == 0;) xd.pop();\r\n\r\n    y.d = xd;\r\n    y.e = getBase10Exponent(xd, e);\r\n\r\n    return external ? finalise(y, pr, rm) : y;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return the number of significant digits of the value of this Decimal.\r\n   *\r\n   * [z] {boolean|number} Whether to count integer-part trailing zeros: true, false, 1 or 0.\r\n   *\r\n   */\r\n  P.precision = P.sd = function (z) {\r\n    var k,\r\n      x = this;\r\n\r\n    if (z !== void 0 && z !== !!z && z !== 1 && z !== 0) throw Error(invalidArgument + z);\r\n\r\n    if (x.d) {\r\n      k = getPrecision(x.d);\r\n      if (z && x.e + 1 > k) k = x.e + 1;\r\n    } else {\r\n      k = NaN;\r\n    }\r\n\r\n    return k;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the value of this Decimal rounded to a whole number using\r\n   * rounding mode `rounding`.\r\n   *\r\n   */\r\n  P.round = function () {\r\n    var x = this,\r\n      Ctor = x.constructor;\r\n\r\n    return finalise(new Ctor(x), x.e + 1, Ctor.rounding);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the sine of the value in radians of this Decimal.\r\n   *\r\n   * Domain: [-Infinity, Infinity]\r\n   * Range: [-1, 1]\r\n   *\r\n   * sin(x) = x - x^3/3! + x^5/5! - ...\r\n   *\r\n   * sin(0)         = 0\r\n   * sin(-0)        = -0\r\n   * sin(Infinity)  = NaN\r\n   * sin(-Infinity) = NaN\r\n   * sin(NaN)       = NaN\r\n   *\r\n   */\r\n  P.sine = P.sin = function () {\r\n    var pr, rm,\r\n      x = this,\r\n      Ctor = x.constructor;\r\n\r\n    if (!x.isFinite()) return new Ctor(NaN);\r\n    if (x.isZero()) return new Ctor(x);\r\n\r\n    pr = Ctor.precision;\r\n    rm = Ctor.rounding;\r\n    Ctor.precision = pr + Math.max(x.e, x.sd()) + LOG_BASE;\r\n    Ctor.rounding = 1;\r\n\r\n    x = sine(Ctor, toLessThanHalfPi(Ctor, x));\r\n\r\n    Ctor.precision = pr;\r\n    Ctor.rounding = rm;\r\n\r\n    return finalise(quadrant > 2 ? x.neg() : x, pr, rm, true);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the square root of this Decimal, rounded to `precision`\r\n   * significant digits using rounding mode `rounding`.\r\n   *\r\n   *  sqrt(-n) =  N\r\n   *  sqrt(N)  =  N\r\n   *  sqrt(-I) =  N\r\n   *  sqrt(I)  =  I\r\n   *  sqrt(0)  =  0\r\n   *  sqrt(-0) = -0\r\n   *\r\n   */\r\n  P.squareRoot = P.sqrt = function () {\r\n    var m, n, sd, r, rep, t,\r\n      x = this,\r\n      d = x.d,\r\n      e = x.e,\r\n      s = x.s,\r\n      Ctor = x.constructor;\r\n\r\n    // Negative/NaN/Infinity/zero?\r\n    if (s !== 1 || !d || !d[0]) {\r\n      return new Ctor(!s || s < 0 && (!d || d[0]) ? NaN : d ? x : 1 / 0);\r\n    }\r\n\r\n    external = false;\r\n\r\n    // Initial estimate.\r\n    s = Math.sqrt(+x);\r\n\r\n    // Math.sqrt underflow/overflow?\r\n    // Pass x to Math.sqrt as integer, then adjust the exponent of the result.\r\n    if (s == 0 || s == 1 / 0) {\r\n      n = digitsToString(d);\r\n\r\n      if ((n.length + e) % 2 == 0) n += '0';\r\n      s = Math.sqrt(n);\r\n      e = mathfloor((e + 1) / 2) - (e < 0 || e % 2);\r\n\r\n      if (s == 1 / 0) {\r\n        n = '1e' + e;\r\n      } else {\r\n        n = s.toExponential();\r\n        n = n.slice(0, n.indexOf('e') + 1) + e;\r\n      }\r\n\r\n      r = new Ctor(n);\r\n    } else {\r\n      r = new Ctor(s.toString());\r\n    }\r\n\r\n    sd = (e = Ctor.precision) + 3;\r\n\r\n    // Newton-Raphson iteration.\r\n    for (;;) {\r\n      t = r;\r\n      r = t.plus(divide(x, t, sd + 2, 1)).times(0.5);\r\n\r\n      // TODO? Replace with for-loop and checkRoundingDigits.\r\n      if (digitsToString(t.d).slice(0, sd) === (n = digitsToString(r.d)).slice(0, sd)) {\r\n        n = n.slice(sd - 3, sd + 1);\r\n\r\n        // The 4th rounding digit may be in error by -1 so if the 4 rounding digits are 9999 or\r\n        // 4999, i.e. approaching a rounding boundary, continue the iteration.\r\n        if (n == '9999' || !rep && n == '4999') {\r\n\r\n          // On the first iteration only, check to see if rounding up gives the exact result as the\r\n          // nines may infinitely repeat.\r\n          if (!rep) {\r\n            finalise(t, e + 1, 0);\r\n\r\n            if (t.times(t).eq(x)) {\r\n              r = t;\r\n              break;\r\n            }\r\n          }\r\n\r\n          sd += 4;\r\n          rep = 1;\r\n        } else {\r\n\r\n          // If the rounding digits are null, 0{0,4} or 50{0,3}, check for an exact result.\r\n          // If not, then there are further digits and m will be truthy.\r\n          if (!+n || !+n.slice(1) && n.charAt(0) == '5') {\r\n\r\n            // Truncate to the first rounding digit.\r\n            finalise(r, e + 1, 1);\r\n            m = !r.times(r).eq(x);\r\n          }\r\n\r\n          break;\r\n        }\r\n      }\r\n    }\r\n\r\n    external = true;\r\n\r\n    return finalise(r, e, Ctor.rounding, m);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the tangent of the value in radians of this Decimal.\r\n   *\r\n   * Domain: [-Infinity, Infinity]\r\n   * Range: [-Infinity, Infinity]\r\n   *\r\n   * tan(0)         = 0\r\n   * tan(-0)        = -0\r\n   * tan(Infinity)  = NaN\r\n   * tan(-Infinity) = NaN\r\n   * tan(NaN)       = NaN\r\n   *\r\n   */\r\n  P.tangent = P.tan = function () {\r\n    var pr, rm,\r\n      x = this,\r\n      Ctor = x.constructor;\r\n\r\n    if (!x.isFinite()) return new Ctor(NaN);\r\n    if (x.isZero()) return new Ctor(x);\r\n\r\n    pr = Ctor.precision;\r\n    rm = Ctor.rounding;\r\n    Ctor.precision = pr + 10;\r\n    Ctor.rounding = 1;\r\n\r\n    x = x.sin();\r\n    x.s = 1;\r\n    x = divide(x, new Ctor(1).minus(x.times(x)).sqrt(), pr + 10, 0);\r\n\r\n    Ctor.precision = pr;\r\n    Ctor.rounding = rm;\r\n\r\n    return finalise(quadrant == 2 || quadrant == 4 ? x.neg() : x, pr, rm, true);\r\n  };\r\n\r\n\r\n  /*\r\n   *  n * 0 = 0\r\n   *  n * N = N\r\n   *  n * I = I\r\n   *  0 * n = 0\r\n   *  0 * 0 = 0\r\n   *  0 * N = N\r\n   *  0 * I = N\r\n   *  N * n = N\r\n   *  N * 0 = N\r\n   *  N * N = N\r\n   *  N * I = N\r\n   *  I * n = I\r\n   *  I * 0 = N\r\n   *  I * N = N\r\n   *  I * I = I\r\n   *\r\n   * Return a new Decimal whose value is this Decimal times `y`, rounded to `precision` significant\r\n   * digits using rounding mode `rounding`.\r\n   *\r\n   */\r\n  P.times = P.mul = function (y) {\r\n    var carry, e, i, k, r, rL, t, xdL, ydL,\r\n      x = this,\r\n      Ctor = x.constructor,\r\n      xd = x.d,\r\n      yd = (y = new Ctor(y)).d;\r\n\r\n    y.s *= x.s;\r\n\r\n     // If either is NaN, ±Infinity or ±0...\r\n    if (!xd || !xd[0] || !yd || !yd[0]) {\r\n\r\n      return new Ctor(!y.s || xd && !xd[0] && !yd || yd && !yd[0] && !xd\r\n\r\n        // Return NaN if either is NaN.\r\n        // Return NaN if x is ±0 and y is ±Infinity, or y is ±0 and x is ±Infinity.\r\n        ? NaN\r\n\r\n        // Return ±Infinity if either is ±Infinity.\r\n        // Return ±0 if either is ±0.\r\n        : !xd || !yd ? y.s / 0 : y.s * 0);\r\n    }\r\n\r\n    e = mathfloor(x.e / LOG_BASE) + mathfloor(y.e / LOG_BASE);\r\n    xdL = xd.length;\r\n    ydL = yd.length;\r\n\r\n    // Ensure xd points to the longer array.\r\n    if (xdL < ydL) {\r\n      r = xd;\r\n      xd = yd;\r\n      yd = r;\r\n      rL = xdL;\r\n      xdL = ydL;\r\n      ydL = rL;\r\n    }\r\n\r\n    // Initialise the result array with zeros.\r\n    r = [];\r\n    rL = xdL + ydL;\r\n    for (i = rL; i--;) r.push(0);\r\n\r\n    // Multiply!\r\n    for (i = ydL; --i >= 0;) {\r\n      carry = 0;\r\n      for (k = xdL + i; k > i;) {\r\n        t = r[k] + yd[i] * xd[k - i - 1] + carry;\r\n        r[k--] = t % BASE | 0;\r\n        carry = t / BASE | 0;\r\n      }\r\n\r\n      r[k] = (r[k] + carry) % BASE | 0;\r\n    }\r\n\r\n    // Remove trailing zeros.\r\n    for (; !r[--rL];) r.pop();\r\n\r\n    if (carry) ++e;\r\n    else r.shift();\r\n\r\n    y.d = r;\r\n    y.e = getBase10Exponent(r, e);\r\n\r\n    return external ? finalise(y, Ctor.precision, Ctor.rounding) : y;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a string representing the value of this Decimal in base 2, round to `sd` significant\r\n   * digits using rounding mode `rm`.\r\n   *\r\n   * If the optional `sd` argument is present then return binary exponential notation.\r\n   *\r\n   * [sd] {number} Significant digits. Integer, 1 to MAX_DIGITS inclusive.\r\n   * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.\r\n   *\r\n   */\r\n  P.toBinary = function (sd, rm) {\r\n    return toStringBinary(this, 2, sd, rm);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the value of this Decimal rounded to a maximum of `dp`\r\n   * decimal places using rounding mode `rm` or `rounding` if `rm` is omitted.\r\n   *\r\n   * If `dp` is omitted, return a new Decimal whose value is the value of this Decimal.\r\n   *\r\n   * [dp] {number} Decimal places. Integer, 0 to MAX_DIGITS inclusive.\r\n   * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.\r\n   *\r\n   */\r\n  P.toDecimalPlaces = P.toDP = function (dp, rm) {\r\n    var x = this,\r\n      Ctor = x.constructor;\r\n\r\n    x = new Ctor(x);\r\n    if (dp === void 0) return x;\r\n\r\n    checkInt32(dp, 0, MAX_DIGITS);\r\n\r\n    if (rm === void 0) rm = Ctor.rounding;\r\n    else checkInt32(rm, 0, 8);\r\n\r\n    return finalise(x, dp + x.e + 1, rm);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a string representing the value of this Decimal in exponential notation rounded to\r\n   * `dp` fixed decimal places using rounding mode `rounding`.\r\n   *\r\n   * [dp] {number} Decimal places. Integer, 0 to MAX_DIGITS inclusive.\r\n   * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.\r\n   *\r\n   */\r\n  P.toExponential = function (dp, rm) {\r\n    var str,\r\n      x = this,\r\n      Ctor = x.constructor;\r\n\r\n    if (dp === void 0) {\r\n      str = finiteToString(x, true);\r\n    } else {\r\n      checkInt32(dp, 0, MAX_DIGITS);\r\n\r\n      if (rm === void 0) rm = Ctor.rounding;\r\n      else checkInt32(rm, 0, 8);\r\n\r\n      x = finalise(new Ctor(x), dp + 1, rm);\r\n      str = finiteToString(x, true, dp + 1);\r\n    }\r\n\r\n    return x.isNeg() && !x.isZero() ? '-' + str : str;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a string representing the value of this Decimal in normal (fixed-point) notation to\r\n   * `dp` fixed decimal places and rounded using rounding mode `rm` or `rounding` if `rm` is\r\n   * omitted.\r\n   *\r\n   * As with JavaScript numbers, (-0).toFixed(0) is '0', but e.g. (-0.00001).toFixed(0) is '-0'.\r\n   *\r\n   * [dp] {number} Decimal places. Integer, 0 to MAX_DIGITS inclusive.\r\n   * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.\r\n   *\r\n   * (-0).toFixed(0) is '0', but (-0.1).toFixed(0) is '-0'.\r\n   * (-0).toFixed(1) is '0.0', but (-0.01).toFixed(1) is '-0.0'.\r\n   * (-0).toFixed(3) is '0.000'.\r\n   * (-0.5).toFixed(0) is '-0'.\r\n   *\r\n   */\r\n  P.toFixed = function (dp, rm) {\r\n    var str, y,\r\n      x = this,\r\n      Ctor = x.constructor;\r\n\r\n    if (dp === void 0) {\r\n      str = finiteToString(x);\r\n    } else {\r\n      checkInt32(dp, 0, MAX_DIGITS);\r\n\r\n      if (rm === void 0) rm = Ctor.rounding;\r\n      else checkInt32(rm, 0, 8);\r\n\r\n      y = finalise(new Ctor(x), dp + x.e + 1, rm);\r\n      str = finiteToString(y, false, dp + y.e + 1);\r\n    }\r\n\r\n    // To determine whether to add the minus sign look at the value before it was rounded,\r\n    // i.e. look at `x` rather than `y`.\r\n    return x.isNeg() && !x.isZero() ? '-' + str : str;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return an array representing the value of this Decimal as a simple fraction with an integer\r\n   * numerator and an integer denominator.\r\n   *\r\n   * The denominator will be a positive non-zero value less than or equal to the specified maximum\r\n   * denominator. If a maximum denominator is not specified, the denominator will be the lowest\r\n   * value necessary to represent the number exactly.\r\n   *\r\n   * [maxD] {number|string|Decimal} Maximum denominator. Integer >= 1 and < Infinity.\r\n   *\r\n   */\r\n  P.toFraction = function (maxD) {\r\n    var d, d0, d1, d2, e, k, n, n0, n1, pr, q, r,\r\n      x = this,\r\n      xd = x.d,\r\n      Ctor = x.constructor;\r\n\r\n    if (!xd) return new Ctor(x);\r\n\r\n    n1 = d0 = new Ctor(1);\r\n    d1 = n0 = new Ctor(0);\r\n\r\n    d = new Ctor(d1);\r\n    e = d.e = getPrecision(xd) - x.e - 1;\r\n    k = e % LOG_BASE;\r\n    d.d[0] = mathpow(10, k < 0 ? LOG_BASE + k : k);\r\n\r\n    if (maxD == null) {\r\n\r\n      // d is 10**e, the minimum max-denominator needed.\r\n      maxD = e > 0 ? d : n1;\r\n    } else {\r\n      n = new Ctor(maxD);\r\n      if (!n.isInt() || n.lt(n1)) throw Error(invalidArgument + n);\r\n      maxD = n.gt(d) ? (e > 0 ? d : n1) : n;\r\n    }\r\n\r\n    external = false;\r\n    n = new Ctor(digitsToString(xd));\r\n    pr = Ctor.precision;\r\n    Ctor.precision = e = xd.length * LOG_BASE * 2;\r\n\r\n    for (;;)  {\r\n      q = divide(n, d, 0, 1, 1);\r\n      d2 = d0.plus(q.times(d1));\r\n      if (d2.cmp(maxD) == 1) break;\r\n      d0 = d1;\r\n      d1 = d2;\r\n      d2 = n1;\r\n      n1 = n0.plus(q.times(d2));\r\n      n0 = d2;\r\n      d2 = d;\r\n      d = n.minus(q.times(d2));\r\n      n = d2;\r\n    }\r\n\r\n    d2 = divide(maxD.minus(d0), d1, 0, 1, 1);\r\n    n0 = n0.plus(d2.times(n1));\r\n    d0 = d0.plus(d2.times(d1));\r\n    n0.s = n1.s = x.s;\r\n\r\n    // Determine which fraction is closer to x, n0/d0 or n1/d1?\r\n    r = divide(n1, d1, e, 1).minus(x).abs().cmp(divide(n0, d0, e, 1).minus(x).abs()) < 1\r\n        ? [n1, d1] : [n0, d0];\r\n\r\n    Ctor.precision = pr;\r\n    external = true;\r\n\r\n    return r;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a string representing the value of this Decimal in base 16, round to `sd` significant\r\n   * digits using rounding mode `rm`.\r\n   *\r\n   * If the optional `sd` argument is present then return binary exponential notation.\r\n   *\r\n   * [sd] {number} Significant digits. Integer, 1 to MAX_DIGITS inclusive.\r\n   * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.\r\n   *\r\n   */\r\n  P.toHexadecimal = P.toHex = function (sd, rm) {\r\n    return toStringBinary(this, 16, sd, rm);\r\n  };\r\n\r\n\r\n  /*\r\n   * Returns a new Decimal whose value is the nearest multiple of `y` in the direction of rounding\r\n   * mode `rm`, or `Decimal.rounding` if `rm` is omitted, to the value of this Decimal.\r\n   *\r\n   * The return value will always have the same sign as this Decimal, unless either this Decimal\r\n   * or `y` is NaN, in which case the return value will be also be NaN.\r\n   *\r\n   * The return value is not affected by the value of `precision`.\r\n   *\r\n   * y {number|string|Decimal} The magnitude to round to a multiple of.\r\n   * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.\r\n   *\r\n   * 'toNearest() rounding mode not an integer: {rm}'\r\n   * 'toNearest() rounding mode out of range: {rm}'\r\n   *\r\n   */\r\n  P.toNearest = function (y, rm) {\r\n    var x = this,\r\n      Ctor = x.constructor;\r\n\r\n    x = new Ctor(x);\r\n\r\n    if (y == null) {\r\n\r\n      // If x is not finite, return x.\r\n      if (!x.d) return x;\r\n\r\n      y = new Ctor(1);\r\n      rm = Ctor.rounding;\r\n    } else {\r\n      y = new Ctor(y);\r\n      if (rm === void 0) {\r\n        rm = Ctor.rounding;\r\n      } else {\r\n        checkInt32(rm, 0, 8);\r\n      }\r\n\r\n      // If x is not finite, return x if y is not NaN, else NaN.\r\n      if (!x.d) return y.s ? x : y;\r\n\r\n      // If y is not finite, return Infinity with the sign of x if y is Infinity, else NaN.\r\n      if (!y.d) {\r\n        if (y.s) y.s = x.s;\r\n        return y;\r\n      }\r\n    }\r\n\r\n    // If y is not zero, calculate the nearest multiple of y to x.\r\n    if (y.d[0]) {\r\n      external = false;\r\n      x = divide(x, y, 0, rm, 1).times(y);\r\n      external = true;\r\n      finalise(x);\r\n\r\n    // If y is zero, return zero with the sign of x.\r\n    } else {\r\n      y.s = x.s;\r\n      x = y;\r\n    }\r\n\r\n    return x;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return the value of this Decimal converted to a number primitive.\r\n   * Zero keeps its sign.\r\n   *\r\n   */\r\n  P.toNumber = function () {\r\n    return +this;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a string representing the value of this Decimal in base 8, round to `sd` significant\r\n   * digits using rounding mode `rm`.\r\n   *\r\n   * If the optional `sd` argument is present then return binary exponential notation.\r\n   *\r\n   * [sd] {number} Significant digits. Integer, 1 to MAX_DIGITS inclusive.\r\n   * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.\r\n   *\r\n   */\r\n  P.toOctal = function (sd, rm) {\r\n    return toStringBinary(this, 8, sd, rm);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the value of this Decimal raised to the power `y`, rounded\r\n   * to `precision` significant digits using rounding mode `rounding`.\r\n   *\r\n   * ECMAScript compliant.\r\n   *\r\n   *   pow(x, NaN)                           = NaN\r\n   *   pow(x, ±0)                            = 1\r\n\r\n   *   pow(NaN, non-zero)                    = NaN\r\n   *   pow(abs(x) > 1, +Infinity)            = +Infinity\r\n   *   pow(abs(x) > 1, -Infinity)            = +0\r\n   *   pow(abs(x) == 1, ±Infinity)           = NaN\r\n   *   pow(abs(x) < 1, +Infinity)            = +0\r\n   *   pow(abs(x) < 1, -Infinity)            = +Infinity\r\n   *   pow(+Infinity, y > 0)                 = +Infinity\r\n   *   pow(+Infinity, y < 0)                 = +0\r\n   *   pow(-Infinity, odd integer > 0)       = -Infinity\r\n   *   pow(-Infinity, even integer > 0)      = +Infinity\r\n   *   pow(-Infinity, odd integer < 0)       = -0\r\n   *   pow(-Infinity, even integer < 0)      = +0\r\n   *   pow(+0, y > 0)                        = +0\r\n   *   pow(+0, y < 0)                        = +Infinity\r\n   *   pow(-0, odd integer > 0)              = -0\r\n   *   pow(-0, even integer > 0)             = +0\r\n   *   pow(-0, odd integer < 0)              = -Infinity\r\n   *   pow(-0, even integer < 0)             = +Infinity\r\n   *   pow(finite x < 0, finite non-integer) = NaN\r\n   *\r\n   * For non-integer or very large exponents pow(x, y) is calculated using\r\n   *\r\n   *   x^y = exp(y*ln(x))\r\n   *\r\n   * Assuming the first 15 rounding digits are each equally likely to be any digit 0-9, the\r\n   * probability of an incorrectly rounded result\r\n   * P([49]9{14} | [50]0{14}) = 2 * 0.2 * 10^-14 = 4e-15 = 1/2.5e+14\r\n   * i.e. 1 in 250,000,000,000,000\r\n   *\r\n   * If a result is incorrectly rounded the maximum error will be 1 ulp (unit in last place).\r\n   *\r\n   * y {number|string|Decimal} The power to which to raise this Decimal.\r\n   *\r\n   */\r\n  P.toPower = P.pow = function (y) {\r\n    var e, k, pr, r, rm, s,\r\n      x = this,\r\n      Ctor = x.constructor,\r\n      yn = +(y = new Ctor(y));\r\n\r\n    // Either ±Infinity, NaN or ±0?\r\n    if (!x.d || !y.d || !x.d[0] || !y.d[0]) return new Ctor(mathpow(+x, yn));\r\n\r\n    x = new Ctor(x);\r\n\r\n    if (x.eq(1)) return x;\r\n\r\n    pr = Ctor.precision;\r\n    rm = Ctor.rounding;\r\n\r\n    if (y.eq(1)) return finalise(x, pr, rm);\r\n\r\n    // y exponent\r\n    e = mathfloor(y.e / LOG_BASE);\r\n\r\n    // If y is a small integer use the 'exponentiation by squaring' algorithm.\r\n    if (e >= y.d.length - 1 && (k = yn < 0 ? -yn : yn) <= MAX_SAFE_INTEGER) {\r\n      r = intPow(Ctor, x, k, pr);\r\n      return y.s < 0 ? new Ctor(1).div(r) : finalise(r, pr, rm);\r\n    }\r\n\r\n    s = x.s;\r\n\r\n    // if x is negative\r\n    if (s < 0) {\r\n\r\n      // if y is not an integer\r\n      if (e < y.d.length - 1) return new Ctor(NaN);\r\n\r\n      // Result is positive if x is negative and the last digit of integer y is even.\r\n      if ((y.d[e] & 1) == 0) s = 1;\r\n\r\n      // if x.eq(-1)\r\n      if (x.e == 0 && x.d[0] == 1 && x.d.length == 1) {\r\n        x.s = s;\r\n        return x;\r\n      }\r\n    }\r\n\r\n    // Estimate result exponent.\r\n    // x^y = 10^e,  where e = y * log10(x)\r\n    // log10(x) = log10(x_significand) + x_exponent\r\n    // log10(x_significand) = ln(x_significand) / ln(10)\r\n    k = mathpow(+x, yn);\r\n    e = k == 0 || !isFinite(k)\r\n      ? mathfloor(yn * (Math.log('0.' + digitsToString(x.d)) / Math.LN10 + x.e + 1))\r\n      : new Ctor(k + '').e;\r\n\r\n    // Exponent estimate may be incorrect e.g. x: 0.999999999999999999, y: 2.29, e: 0, r.e: -1.\r\n\r\n    // Overflow/underflow?\r\n    if (e > Ctor.maxE + 1 || e < Ctor.minE - 1) return new Ctor(e > 0 ? s / 0 : 0);\r\n\r\n    external = false;\r\n    Ctor.rounding = x.s = 1;\r\n\r\n    // Estimate the extra guard digits needed to ensure five correct rounding digits from\r\n    // naturalLogarithm(x). Example of failure without these extra digits (precision: 10):\r\n    // new Decimal(2.32456).pow('2087987436534566.46411')\r\n    // should be 1.162377823e+764914905173815, but is 1.162355823e+764914905173815\r\n    k = Math.min(12, (e + '').length);\r\n\r\n    // r = x^y = exp(y*ln(x))\r\n    r = naturalExponential(y.times(naturalLogarithm(x, pr + k)), pr);\r\n\r\n    // r may be Infinity, e.g. (0.9999999999999999).pow(-1e+40)\r\n    if (r.d) {\r\n\r\n      // Truncate to the required precision plus five rounding digits.\r\n      r = finalise(r, pr + 5, 1);\r\n\r\n      // If the rounding digits are [49]9999 or [50]0000 increase the precision by 10 and recalculate\r\n      // the result.\r\n      if (checkRoundingDigits(r.d, pr, rm)) {\r\n        e = pr + 10;\r\n\r\n        // Truncate to the increased precision plus five rounding digits.\r\n        r = finalise(naturalExponential(y.times(naturalLogarithm(x, e + k)), e), e + 5, 1);\r\n\r\n        // Check for 14 nines from the 2nd rounding digit (the first rounding digit may be 4 or 9).\r\n        if (+digitsToString(r.d).slice(pr + 1, pr + 15) + 1 == 1e14) {\r\n          r = finalise(r, pr + 1, 0);\r\n        }\r\n      }\r\n    }\r\n\r\n    r.s = s;\r\n    external = true;\r\n    Ctor.rounding = rm;\r\n\r\n    return finalise(r, pr, rm);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a string representing the value of this Decimal rounded to `sd` significant digits\r\n   * using rounding mode `rounding`.\r\n   *\r\n   * Return exponential notation if `sd` is less than the number of digits necessary to represent\r\n   * the integer part of the value in normal notation.\r\n   *\r\n   * [sd] {number} Significant digits. Integer, 1 to MAX_DIGITS inclusive.\r\n   * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.\r\n   *\r\n   */\r\n  P.toPrecision = function (sd, rm) {\r\n    var str,\r\n      x = this,\r\n      Ctor = x.constructor;\r\n\r\n    if (sd === void 0) {\r\n      str = finiteToString(x, x.e <= Ctor.toExpNeg || x.e >= Ctor.toExpPos);\r\n    } else {\r\n      checkInt32(sd, 1, MAX_DIGITS);\r\n\r\n      if (rm === void 0) rm = Ctor.rounding;\r\n      else checkInt32(rm, 0, 8);\r\n\r\n      x = finalise(new Ctor(x), sd, rm);\r\n      str = finiteToString(x, sd <= x.e || x.e <= Ctor.toExpNeg, sd);\r\n    }\r\n\r\n    return x.isNeg() && !x.isZero() ? '-' + str : str;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the value of this Decimal rounded to a maximum of `sd`\r\n   * significant digits using rounding mode `rm`, or to `precision` and `rounding` respectively if\r\n   * omitted.\r\n   *\r\n   * [sd] {number} Significant digits. Integer, 1 to MAX_DIGITS inclusive.\r\n   * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.\r\n   *\r\n   * 'toSD() digits out of range: {sd}'\r\n   * 'toSD() digits not an integer: {sd}'\r\n   * 'toSD() rounding mode not an integer: {rm}'\r\n   * 'toSD() rounding mode out of range: {rm}'\r\n   *\r\n   */\r\n  P.toSignificantDigits = P.toSD = function (sd, rm) {\r\n    var x = this,\r\n      Ctor = x.constructor;\r\n\r\n    if (sd === void 0) {\r\n      sd = Ctor.precision;\r\n      rm = Ctor.rounding;\r\n    } else {\r\n      checkInt32(sd, 1, MAX_DIGITS);\r\n\r\n      if (rm === void 0) rm = Ctor.rounding;\r\n      else checkInt32(rm, 0, 8);\r\n    }\r\n\r\n    return finalise(new Ctor(x), sd, rm);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a string representing the value of this Decimal.\r\n   *\r\n   * Return exponential notation if this Decimal has a positive exponent equal to or greater than\r\n   * `toExpPos`, or a negative exponent equal to or less than `toExpNeg`.\r\n   *\r\n   */\r\n  P.toString = function () {\r\n    var x = this,\r\n      Ctor = x.constructor,\r\n      str = finiteToString(x, x.e <= Ctor.toExpNeg || x.e >= Ctor.toExpPos);\r\n\r\n    return x.isNeg() && !x.isZero() ? '-' + str : str;\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the value of this Decimal truncated to a whole number.\r\n   *\r\n   */\r\n  P.truncated = P.trunc = function () {\r\n    return finalise(new this.constructor(this), this.e + 1, 1);\r\n  };\r\n\r\n\r\n  /*\r\n   * Return a string representing the value of this Decimal.\r\n   * Unlike `toString`, negative zero will include the minus sign.\r\n   *\r\n   */\r\n  P.valueOf = P.toJSON = function () {\r\n    var x = this,\r\n      Ctor = x.constructor,\r\n      str = finiteToString(x, x.e <= Ctor.toExpNeg || x.e >= Ctor.toExpPos);\r\n\r\n    return x.isNeg() ? '-' + str : str;\r\n  };\r\n\r\n\r\n  /*\r\n  // Add aliases to match BigDecimal method names.\r\n  // P.add = P.plus;\r\n  P.subtract = P.minus;\r\n  P.multiply = P.times;\r\n  P.divide = P.div;\r\n  P.remainder = P.mod;\r\n  P.compareTo = P.cmp;\r\n  P.negate = P.neg;\r\n   */\r\n\r\n\r\n  // Helper functions for Decimal.prototype (P) and/or Decimal methods, and their callers.\r\n\r\n\r\n  /*\r\n   *  digitsToString           P.cubeRoot, P.logarithm, P.squareRoot, P.toFraction, P.toPower,\r\n   *                           finiteToString, naturalExponential, naturalLogarithm\r\n   *  checkInt32               P.toDecimalPlaces, P.toExponential, P.toFixed, P.toNearest,\r\n   *                           P.toPrecision, P.toSignificantDigits, toStringBinary, random\r\n   *  checkRoundingDigits      P.logarithm, P.toPower, naturalExponential, naturalLogarithm\r\n   *  convertBase              toStringBinary, parseOther\r\n   *  cos                      P.cos\r\n   *  divide                   P.atanh, P.cubeRoot, P.dividedBy, P.dividedToIntegerBy,\r\n   *                           P.logarithm, P.modulo, P.squareRoot, P.tan, P.tanh, P.toFraction,\r\n   *                           P.toNearest, toStringBinary, naturalExponential, naturalLogarithm,\r\n   *                           taylorSeries, atan2, parseOther\r\n   *  finalise                 P.absoluteValue, P.atan, P.atanh, P.ceil, P.cos, P.cosh,\r\n   *                           P.cubeRoot, P.dividedToIntegerBy, P.floor, P.logarithm, P.minus,\r\n   *                           P.modulo, P.negated, P.plus, P.round, P.sin, P.sinh, P.squareRoot,\r\n   *                           P.tan, P.times, P.toDecimalPlaces, P.toExponential, P.toFixed,\r\n   *                           P.toNearest, P.toPower, P.toPrecision, P.toSignificantDigits,\r\n   *                           P.truncated, divide, getLn10, getPi, naturalExponential,\r\n   *                           naturalLogarithm, ceil, floor, round, trunc\r\n   *  finiteToString           P.toExponential, P.toFixed, P.toPrecision, P.toString, P.valueOf,\r\n   *                           toStringBinary\r\n   *  getBase10Exponent        P.minus, P.plus, P.times, parseOther\r\n   *  getLn10                  P.logarithm, naturalLogarithm\r\n   *  getPi                    P.acos, P.asin, P.atan, toLessThanHalfPi, atan2\r\n   *  getPrecision             P.precision, P.toFraction\r\n   *  getZeroString            digitsToString, finiteToString\r\n   *  intPow                   P.toPower, parseOther\r\n   *  isOdd                    toLessThanHalfPi\r\n   *  maxOrMin                 max, min\r\n   *  naturalExponential       P.naturalExponential, P.toPower\r\n   *  naturalLogarithm         P.acosh, P.asinh, P.atanh, P.logarithm, P.naturalLogarithm,\r\n   *                           P.toPower, naturalExponential\r\n   *  nonFiniteToString        finiteToString, toStringBinary\r\n   *  parseDecimal             Decimal\r\n   *  parseOther               Decimal\r\n   *  sin                      P.sin\r\n   *  taylorSeries             P.cosh, P.sinh, cos, sin\r\n   *  toLessThanHalfPi         P.cos, P.sin\r\n   *  toStringBinary           P.toBinary, P.toHexadecimal, P.toOctal\r\n   *  truncate                 intPow\r\n   *\r\n   *  Throws:                  P.logarithm, P.precision, P.toFraction, checkInt32, getLn10, getPi,\r\n   *                           naturalLogarithm, config, parseOther, random, Decimal\r\n   */\r\n\r\n\r\n  function digitsToString(d) {\r\n    var i, k, ws,\r\n      indexOfLastWord = d.length - 1,\r\n      str = '',\r\n      w = d[0];\r\n\r\n    if (indexOfLastWord > 0) {\r\n      str += w;\r\n      for (i = 1; i < indexOfLastWord; i++) {\r\n        ws = d[i] + '';\r\n        k = LOG_BASE - ws.length;\r\n        if (k) str += getZeroString(k);\r\n        str += ws;\r\n      }\r\n\r\n      w = d[i];\r\n      ws = w + '';\r\n      k = LOG_BASE - ws.length;\r\n      if (k) str += getZeroString(k);\r\n    } else if (w === 0) {\r\n      return '0';\r\n    }\r\n\r\n    // Remove trailing zeros of last w.\r\n    for (; w % 10 === 0;) w /= 10;\r\n\r\n    return str + w;\r\n  }\r\n\r\n\r\n  function checkInt32(i, min, max) {\r\n    if (i !== ~~i || i < min || i > max) {\r\n      throw Error(invalidArgument + i);\r\n    }\r\n  }\r\n\r\n\r\n  /*\r\n   * Check 5 rounding digits if `repeating` is null, 4 otherwise.\r\n   * `repeating == null` if caller is `log` or `pow`,\r\n   * `repeating != null` if caller is `naturalLogarithm` or `naturalExponential`.\r\n   */\r\n  function checkRoundingDigits(d, i, rm, repeating) {\r\n    var di, k, r, rd;\r\n\r\n    // Get the length of the first word of the array d.\r\n    for (k = d[0]; k >= 10; k /= 10) --i;\r\n\r\n    // Is the rounding digit in the first word of d?\r\n    if (--i < 0) {\r\n      i += LOG_BASE;\r\n      di = 0;\r\n    } else {\r\n      di = Math.ceil((i + 1) / LOG_BASE);\r\n      i %= LOG_BASE;\r\n    }\r\n\r\n    // i is the index (0 - 6) of the rounding digit.\r\n    // E.g. if within the word 3487563 the first rounding digit is 5,\r\n    // then i = 4, k = 1000, rd = 3487563 % 1000 = 563\r\n    k = mathpow(10, LOG_BASE - i);\r\n    rd = d[di] % k | 0;\r\n\r\n    if (repeating == null) {\r\n      if (i < 3) {\r\n        if (i == 0) rd = rd / 100 | 0;\r\n        else if (i == 1) rd = rd / 10 | 0;\r\n        r = rm < 4 && rd == 99999 || rm > 3 && rd == 49999 || rd == 50000 || rd == 0;\r\n      } else {\r\n        r = (rm < 4 && rd + 1 == k || rm > 3 && rd + 1 == k / 2) &&\r\n          (d[di + 1] / k / 100 | 0) == mathpow(10, i - 2) - 1 ||\r\n            (rd == k / 2 || rd == 0) && (d[di + 1] / k / 100 | 0) == 0;\r\n      }\r\n    } else {\r\n      if (i < 4) {\r\n        if (i == 0) rd = rd / 1000 | 0;\r\n        else if (i == 1) rd = rd / 100 | 0;\r\n        else if (i == 2) rd = rd / 10 | 0;\r\n        r = (repeating || rm < 4) && rd == 9999 || !repeating && rm > 3 && rd == 4999;\r\n      } else {\r\n        r = ((repeating || rm < 4) && rd + 1 == k ||\r\n        (!repeating && rm > 3) && rd + 1 == k / 2) &&\r\n          (d[di + 1] / k / 1000 | 0) == mathpow(10, i - 3) - 1;\r\n      }\r\n    }\r\n\r\n    return r;\r\n  }\r\n\r\n\r\n  // Convert string of `baseIn` to an array of numbers of `baseOut`.\r\n  // Eg. convertBase('255', 10, 16) returns [15, 15].\r\n  // Eg. convertBase('ff', 16, 10) returns [2, 5, 5].\r\n  function convertBase(str, baseIn, baseOut) {\r\n    var j,\r\n      arr = [0],\r\n      arrL,\r\n      i = 0,\r\n      strL = str.length;\r\n\r\n    for (; i < strL;) {\r\n      for (arrL = arr.length; arrL--;) arr[arrL] *= baseIn;\r\n      arr[0] += NUMERALS.indexOf(str.charAt(i++));\r\n      for (j = 0; j < arr.length; j++) {\r\n        if (arr[j] > baseOut - 1) {\r\n          if (arr[j + 1] === void 0) arr[j + 1] = 0;\r\n          arr[j + 1] += arr[j] / baseOut | 0;\r\n          arr[j] %= baseOut;\r\n        }\r\n      }\r\n    }\r\n\r\n    return arr.reverse();\r\n  }\r\n\r\n\r\n  /*\r\n   * cos(x) = 1 - x^2/2! + x^4/4! - ...\r\n   * |x| < pi/2\r\n   *\r\n   */\r\n  function cosine(Ctor, x) {\r\n    var k, y,\r\n      len = x.d.length;\r\n\r\n    // Argument reduction: cos(4x) = 8*(cos^4(x) - cos^2(x)) + 1\r\n    // i.e. cos(x) = 8*(cos^4(x/4) - cos^2(x/4)) + 1\r\n\r\n    // Estimate the optimum number of times to use the argument reduction.\r\n    if (len < 32) {\r\n      k = Math.ceil(len / 3);\r\n      y = (1 / tinyPow(4, k)).toString();\r\n    } else {\r\n      k = 16;\r\n      y = '2.3283064365386962890625e-10';\r\n    }\r\n\r\n    Ctor.precision += k;\r\n\r\n    x = taylorSeries(Ctor, 1, x.times(y), new Ctor(1));\r\n\r\n    // Reverse argument reduction\r\n    for (var i = k; i--;) {\r\n      var cos2x = x.times(x);\r\n      x = cos2x.times(cos2x).minus(cos2x).times(8).plus(1);\r\n    }\r\n\r\n    Ctor.precision -= k;\r\n\r\n    return x;\r\n  }\r\n\r\n\r\n  /*\r\n   * Perform division in the specified base.\r\n   */\r\n  var divide = (function () {\r\n\r\n    // Assumes non-zero x and k, and hence non-zero result.\r\n    function multiplyInteger(x, k, base) {\r\n      var temp,\r\n        carry = 0,\r\n        i = x.length;\r\n\r\n      for (x = x.slice(); i--;) {\r\n        temp = x[i] * k + carry;\r\n        x[i] = temp % base | 0;\r\n        carry = temp / base | 0;\r\n      }\r\n\r\n      if (carry) x.unshift(carry);\r\n\r\n      return x;\r\n    }\r\n\r\n    function compare(a, b, aL, bL) {\r\n      var i, r;\r\n\r\n      if (aL != bL) {\r\n        r = aL > bL ? 1 : -1;\r\n      } else {\r\n        for (i = r = 0; i < aL; i++) {\r\n          if (a[i] != b[i]) {\r\n            r = a[i] > b[i] ? 1 : -1;\r\n            break;\r\n          }\r\n        }\r\n      }\r\n\r\n      return r;\r\n    }\r\n\r\n    function subtract(a, b, aL, base) {\r\n      var i = 0;\r\n\r\n      // Subtract b from a.\r\n      for (; aL--;) {\r\n        a[aL] -= i;\r\n        i = a[aL] < b[aL] ? 1 : 0;\r\n        a[aL] = i * base + a[aL] - b[aL];\r\n      }\r\n\r\n      // Remove leading zeros.\r\n      for (; !a[0] && a.length > 1;) a.shift();\r\n    }\r\n\r\n    return function (x, y, pr, rm, dp, base) {\r\n      var cmp, e, i, k, logBase, more, prod, prodL, q, qd, rem, remL, rem0, sd, t, xi, xL, yd0,\r\n        yL, yz,\r\n        Ctor = x.constructor,\r\n        sign = x.s == y.s ? 1 : -1,\r\n        xd = x.d,\r\n        yd = y.d;\r\n\r\n      // Either NaN, Infinity or 0?\r\n      if (!xd || !xd[0] || !yd || !yd[0]) {\r\n\r\n        return new Ctor(// Return NaN if either NaN, or both Infinity or 0.\r\n          !x.s || !y.s || (xd ? yd && xd[0] == yd[0] : !yd) ? NaN :\r\n\r\n          // Return ±0 if x is 0 or y is ±Infinity, or return ±Infinity as y is 0.\r\n          xd && xd[0] == 0 || !yd ? sign * 0 : sign / 0);\r\n      }\r\n\r\n      if (base) {\r\n        logBase = 1;\r\n        e = x.e - y.e;\r\n      } else {\r\n        base = BASE;\r\n        logBase = LOG_BASE;\r\n        e = mathfloor(x.e / logBase) - mathfloor(y.e / logBase);\r\n      }\r\n\r\n      yL = yd.length;\r\n      xL = xd.length;\r\n      q = new Ctor(sign);\r\n      qd = q.d = [];\r\n\r\n      // Result exponent may be one less than e.\r\n      // The digit array of a Decimal from toStringBinary may have trailing zeros.\r\n      for (i = 0; yd[i] == (xd[i] || 0); i++);\r\n\r\n      if (yd[i] > (xd[i] || 0)) e--;\r\n\r\n      if (pr == null) {\r\n        sd = pr = Ctor.precision;\r\n        rm = Ctor.rounding;\r\n      } else if (dp) {\r\n        sd = pr + (x.e - y.e) + 1;\r\n      } else {\r\n        sd = pr;\r\n      }\r\n\r\n      if (sd < 0) {\r\n        qd.push(1);\r\n        more = true;\r\n      } else {\r\n\r\n        // Convert precision in number of base 10 digits to base 1e7 digits.\r\n        sd = sd / logBase + 2 | 0;\r\n        i = 0;\r\n\r\n        // divisor < 1e7\r\n        if (yL == 1) {\r\n          k = 0;\r\n          yd = yd[0];\r\n          sd++;\r\n\r\n          // k is the carry.\r\n          for (; (i < xL || k) && sd--; i++) {\r\n            t = k * base + (xd[i] || 0);\r\n            qd[i] = t / yd | 0;\r\n            k = t % yd | 0;\r\n          }\r\n\r\n          more = k || i < xL;\r\n\r\n        // divisor >= 1e7\r\n        } else {\r\n\r\n          // Normalise xd and yd so highest order digit of yd is >= base/2\r\n          k = base / (yd[0] + 1) | 0;\r\n\r\n          if (k > 1) {\r\n            yd = multiplyInteger(yd, k, base);\r\n            xd = multiplyInteger(xd, k, base);\r\n            yL = yd.length;\r\n            xL = xd.length;\r\n          }\r\n\r\n          xi = yL;\r\n          rem = xd.slice(0, yL);\r\n          remL = rem.length;\r\n\r\n          // Add zeros to make remainder as long as divisor.\r\n          for (; remL < yL;) rem[remL++] = 0;\r\n\r\n          yz = yd.slice();\r\n          yz.unshift(0);\r\n          yd0 = yd[0];\r\n\r\n          if (yd[1] >= base / 2) ++yd0;\r\n\r\n          do {\r\n            k = 0;\r\n\r\n            // Compare divisor and remainder.\r\n            cmp = compare(yd, rem, yL, remL);\r\n\r\n            // If divisor < remainder.\r\n            if (cmp < 0) {\r\n\r\n              // Calculate trial digit, k.\r\n              rem0 = rem[0];\r\n              if (yL != remL) rem0 = rem0 * base + (rem[1] || 0);\r\n\r\n              // k will be how many times the divisor goes into the current remainder.\r\n              k = rem0 / yd0 | 0;\r\n\r\n              //  Algorithm:\r\n              //  1. product = divisor * trial digit (k)\r\n              //  2. if product > remainder: product -= divisor, k--\r\n              //  3. remainder -= product\r\n              //  4. if product was < remainder at 2:\r\n              //    5. compare new remainder and divisor\r\n              //    6. If remainder > divisor: remainder -= divisor, k++\r\n\r\n              if (k > 1) {\r\n                if (k >= base) k = base - 1;\r\n\r\n                // product = divisor * trial digit.\r\n                prod = multiplyInteger(yd, k, base);\r\n                prodL = prod.length;\r\n                remL = rem.length;\r\n\r\n                // Compare product and remainder.\r\n                cmp = compare(prod, rem, prodL, remL);\r\n\r\n                // product > remainder.\r\n                if (cmp == 1) {\r\n                  k--;\r\n\r\n                  // Subtract divisor from product.\r\n                  subtract(prod, yL < prodL ? yz : yd, prodL, base);\r\n                }\r\n              } else {\r\n\r\n                // cmp is -1.\r\n                // If k is 0, there is no need to compare yd and rem again below, so change cmp to 1\r\n                // to avoid it. If k is 1 there is a need to compare yd and rem again below.\r\n                if (k == 0) cmp = k = 1;\r\n                prod = yd.slice();\r\n              }\r\n\r\n              prodL = prod.length;\r\n              if (prodL < remL) prod.unshift(0);\r\n\r\n              // Subtract product from remainder.\r\n              subtract(rem, prod, remL, base);\r\n\r\n              // If product was < previous remainder.\r\n              if (cmp == -1) {\r\n                remL = rem.length;\r\n\r\n                // Compare divisor and new remainder.\r\n                cmp = compare(yd, rem, yL, remL);\r\n\r\n                // If divisor < new remainder, subtract divisor from remainder.\r\n                if (cmp < 1) {\r\n                  k++;\r\n\r\n                  // Subtract divisor from remainder.\r\n                  subtract(rem, yL < remL ? yz : yd, remL, base);\r\n                }\r\n              }\r\n\r\n              remL = rem.length;\r\n            } else if (cmp === 0) {\r\n              k++;\r\n              rem = [0];\r\n            }    // if cmp === 1, k will be 0\r\n\r\n            // Add the next digit, k, to the result array.\r\n            qd[i++] = k;\r\n\r\n            // Update the remainder.\r\n            if (cmp && rem[0]) {\r\n              rem[remL++] = xd[xi] || 0;\r\n            } else {\r\n              rem = [xd[xi]];\r\n              remL = 1;\r\n            }\r\n\r\n          } while ((xi++ < xL || rem[0] !== void 0) && sd--);\r\n\r\n          more = rem[0] !== void 0;\r\n        }\r\n\r\n        // Leading zero?\r\n        if (!qd[0]) qd.shift();\r\n      }\r\n\r\n      // logBase is 1 when divide is being used for base conversion.\r\n      if (logBase == 1) {\r\n        q.e = e;\r\n        inexact = more;\r\n      } else {\r\n\r\n        // To calculate q.e, first get the number of digits of qd[0].\r\n        for (i = 1, k = qd[0]; k >= 10; k /= 10) i++;\r\n        q.e = i + e * logBase - 1;\r\n\r\n        finalise(q, dp ? pr + q.e + 1 : pr, rm, more);\r\n      }\r\n\r\n      return q;\r\n    };\r\n  })();\r\n\r\n\r\n  /*\r\n   * Round `x` to `sd` significant digits using rounding mode `rm`.\r\n   * Check for over/under-flow.\r\n   */\r\n   function finalise(x, sd, rm, isTruncated) {\r\n    var digits, i, j, k, rd, roundUp, w, xd, xdi,\r\n      Ctor = x.constructor;\r\n\r\n    // Don't round if sd is null or undefined.\r\n    out: if (sd != null) {\r\n      xd = x.d;\r\n\r\n      // Infinity/NaN.\r\n      if (!xd) return x;\r\n\r\n      // rd: the rounding digit, i.e. the digit after the digit that may be rounded up.\r\n      // w: the word of xd containing rd, a base 1e7 number.\r\n      // xdi: the index of w within xd.\r\n      // digits: the number of digits of w.\r\n      // i: what would be the index of rd within w if all the numbers were 7 digits long (i.e. if\r\n      // they had leading zeros)\r\n      // j: if > 0, the actual index of rd within w (if < 0, rd is a leading zero).\r\n\r\n      // Get the length of the first word of the digits array xd.\r\n      for (digits = 1, k = xd[0]; k >= 10; k /= 10) digits++;\r\n      i = sd - digits;\r\n\r\n      // Is the rounding digit in the first word of xd?\r\n      if (i < 0) {\r\n        i += LOG_BASE;\r\n        j = sd;\r\n        w = xd[xdi = 0];\r\n\r\n        // Get the rounding digit at index j of w.\r\n        rd = w / mathpow(10, digits - j - 1) % 10 | 0;\r\n      } else {\r\n        xdi = Math.ceil((i + 1) / LOG_BASE);\r\n        k = xd.length;\r\n        if (xdi >= k) {\r\n          if (isTruncated) {\r\n\r\n            // Needed by `naturalExponential`, `naturalLogarithm` and `squareRoot`.\r\n            for (; k++ <= xdi;) xd.push(0);\r\n            w = rd = 0;\r\n            digits = 1;\r\n            i %= LOG_BASE;\r\n            j = i - LOG_BASE + 1;\r\n          } else {\r\n            break out;\r\n          }\r\n        } else {\r\n          w = k = xd[xdi];\r\n\r\n          // Get the number of digits of w.\r\n          for (digits = 1; k >= 10; k /= 10) digits++;\r\n\r\n          // Get the index of rd within w.\r\n          i %= LOG_BASE;\r\n\r\n          // Get the index of rd within w, adjusted for leading zeros.\r\n          // The number of leading zeros of w is given by LOG_BASE - digits.\r\n          j = i - LOG_BASE + digits;\r\n\r\n          // Get the rounding digit at index j of w.\r\n          rd = j < 0 ? 0 : w / mathpow(10, digits - j - 1) % 10 | 0;\r\n        }\r\n      }\r\n\r\n      // Are there any non-zero digits after the rounding digit?\r\n      isTruncated = isTruncated || sd < 0 ||\r\n        xd[xdi + 1] !== void 0 || (j < 0 ? w : w % mathpow(10, digits - j - 1));\r\n\r\n      // The expression `w % mathpow(10, digits - j - 1)` returns all the digits of w to the right\r\n      // of the digit at (left-to-right) index j, e.g. if w is 908714 and j is 2, the expression\r\n      // will give 714.\r\n\r\n      roundUp = rm < 4\r\n        ? (rd || isTruncated) && (rm == 0 || rm == (x.s < 0 ? 3 : 2))\r\n        : rd > 5 || rd == 5 && (rm == 4 || isTruncated || rm == 6 &&\r\n\r\n          // Check whether the digit to the left of the rounding digit is odd.\r\n          ((i > 0 ? j > 0 ? w / mathpow(10, digits - j) : 0 : xd[xdi - 1]) % 10) & 1 ||\r\n            rm == (x.s < 0 ? 8 : 7));\r\n\r\n      if (sd < 1 || !xd[0]) {\r\n        xd.length = 0;\r\n        if (roundUp) {\r\n\r\n          // Convert sd to decimal places.\r\n          sd -= x.e + 1;\r\n\r\n          // 1, 0.1, 0.01, 0.001, 0.0001 etc.\r\n          xd[0] = mathpow(10, (LOG_BASE - sd % LOG_BASE) % LOG_BASE);\r\n          x.e = -sd || 0;\r\n        } else {\r\n\r\n          // Zero.\r\n          xd[0] = x.e = 0;\r\n        }\r\n\r\n        return x;\r\n      }\r\n\r\n      // Remove excess digits.\r\n      if (i == 0) {\r\n        xd.length = xdi;\r\n        k = 1;\r\n        xdi--;\r\n      } else {\r\n        xd.length = xdi + 1;\r\n        k = mathpow(10, LOG_BASE - i);\r\n\r\n        // E.g. 56700 becomes 56000 if 7 is the rounding digit.\r\n        // j > 0 means i > number of leading zeros of w.\r\n        xd[xdi] = j > 0 ? (w / mathpow(10, digits - j) % mathpow(10, j) | 0) * k : 0;\r\n      }\r\n\r\n      if (roundUp) {\r\n        for (;;) {\r\n\r\n          // Is the digit to be rounded up in the first word of xd?\r\n          if (xdi == 0) {\r\n\r\n            // i will be the length of xd[0] before k is added.\r\n            for (i = 1, j = xd[0]; j >= 10; j /= 10) i++;\r\n            j = xd[0] += k;\r\n            for (k = 1; j >= 10; j /= 10) k++;\r\n\r\n            // if i != k the length has increased.\r\n            if (i != k) {\r\n              x.e++;\r\n              if (xd[0] == BASE) xd[0] = 1;\r\n            }\r\n\r\n            break;\r\n          } else {\r\n            xd[xdi] += k;\r\n            if (xd[xdi] != BASE) break;\r\n            xd[xdi--] = 0;\r\n            k = 1;\r\n          }\r\n        }\r\n      }\r\n\r\n      // Remove trailing zeros.\r\n      for (i = xd.length; xd[--i] === 0;) xd.pop();\r\n    }\r\n\r\n    if (external) {\r\n\r\n      // Overflow?\r\n      if (x.e > Ctor.maxE) {\r\n\r\n        // Infinity.\r\n        x.d = null;\r\n        x.e = NaN;\r\n\r\n      // Underflow?\r\n      } else if (x.e < Ctor.minE) {\r\n\r\n        // Zero.\r\n        x.e = 0;\r\n        x.d = [0];\r\n        // Ctor.underflow = true;\r\n      } // else Ctor.underflow = false;\r\n    }\r\n\r\n    return x;\r\n  }\r\n\r\n\r\n  function finiteToString(x, isExp, sd) {\r\n    if (!x.isFinite()) return nonFiniteToString(x);\r\n    var k,\r\n      e = x.e,\r\n      str = digitsToString(x.d),\r\n      len = str.length;\r\n\r\n    if (isExp) {\r\n      if (sd && (k = sd - len) > 0) {\r\n        str = str.charAt(0) + '.' + str.slice(1) + getZeroString(k);\r\n      } else if (len > 1) {\r\n        str = str.charAt(0) + '.' + str.slice(1);\r\n      }\r\n\r\n      str = str + (x.e < 0 ? 'e' : 'e+') + x.e;\r\n    } else if (e < 0) {\r\n      str = '0.' + getZeroString(-e - 1) + str;\r\n      if (sd && (k = sd - len) > 0) str += getZeroString(k);\r\n    } else if (e >= len) {\r\n      str += getZeroString(e + 1 - len);\r\n      if (sd && (k = sd - e - 1) > 0) str = str + '.' + getZeroString(k);\r\n    } else {\r\n      if ((k = e + 1) < len) str = str.slice(0, k) + '.' + str.slice(k);\r\n      if (sd && (k = sd - len) > 0) {\r\n        if (e + 1 === len) str += '.';\r\n        str += getZeroString(k);\r\n      }\r\n    }\r\n\r\n    return str;\r\n  }\r\n\r\n\r\n  // Calculate the base 10 exponent from the base 1e7 exponent.\r\n  function getBase10Exponent(digits, e) {\r\n    var w = digits[0];\r\n\r\n    // Add the number of digits of the first word of the digits array.\r\n    for ( e *= LOG_BASE; w >= 10; w /= 10) e++;\r\n    return e;\r\n  }\r\n\r\n\r\n  function getLn10(Ctor, sd, pr) {\r\n    if (sd > LN10_PRECISION) {\r\n\r\n      // Reset global state in case the exception is caught.\r\n      external = true;\r\n      if (pr) Ctor.precision = pr;\r\n      throw Error(precisionLimitExceeded);\r\n    }\r\n    return finalise(new Ctor(LN10), sd, 1, true);\r\n  }\r\n\r\n\r\n  function getPi(Ctor, sd, rm) {\r\n    if (sd > PI_PRECISION) throw Error(precisionLimitExceeded);\r\n    return finalise(new Ctor(PI), sd, rm, true);\r\n  }\r\n\r\n\r\n  function getPrecision(digits) {\r\n    var w = digits.length - 1,\r\n      len = w * LOG_BASE + 1;\r\n\r\n    w = digits[w];\r\n\r\n    // If non-zero...\r\n    if (w) {\r\n\r\n      // Subtract the number of trailing zeros of the last word.\r\n      for (; w % 10 == 0; w /= 10) len--;\r\n\r\n      // Add the number of digits of the first word.\r\n      for (w = digits[0]; w >= 10; w /= 10) len++;\r\n    }\r\n\r\n    return len;\r\n  }\r\n\r\n\r\n  function getZeroString(k) {\r\n    var zs = '';\r\n    for (; k--;) zs += '0';\r\n    return zs;\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the value of Decimal `x` to the power `n`, where `n` is an\r\n   * integer of type number.\r\n   *\r\n   * Implements 'exponentiation by squaring'. Called by `pow` and `parseOther`.\r\n   *\r\n   */\r\n  function intPow(Ctor, x, n, pr) {\r\n    var isTruncated,\r\n      r = new Ctor(1),\r\n\r\n      // Max n of 9007199254740991 takes 53 loop iterations.\r\n      // Maximum digits array length; leaves [28, 34] guard digits.\r\n      k = Math.ceil(pr / LOG_BASE + 4);\r\n\r\n    external = false;\r\n\r\n    for (;;) {\r\n      if (n % 2) {\r\n        r = r.times(x);\r\n        if (truncate(r.d, k)) isTruncated = true;\r\n      }\r\n\r\n      n = mathfloor(n / 2);\r\n      if (n === 0) {\r\n\r\n        // To ensure correct rounding when r.d is truncated, increment the last word if it is zero.\r\n        n = r.d.length - 1;\r\n        if (isTruncated && r.d[n] === 0) ++r.d[n];\r\n        break;\r\n      }\r\n\r\n      x = x.times(x);\r\n      truncate(x.d, k);\r\n    }\r\n\r\n    external = true;\r\n\r\n    return r;\r\n  }\r\n\r\n\r\n  function isOdd(n) {\r\n    return n.d[n.d.length - 1] & 1;\r\n  }\r\n\r\n\r\n  /*\r\n   * Handle `max` and `min`. `ltgt` is 'lt' or 'gt'.\r\n   */\r\n  function maxOrMin(Ctor, args, ltgt) {\r\n    var y,\r\n      x = new Ctor(args[0]),\r\n      i = 0;\r\n\r\n    for (; ++i < args.length;) {\r\n      y = new Ctor(args[i]);\r\n      if (!y.s) {\r\n        x = y;\r\n        break;\r\n      } else if (x[ltgt](y)) {\r\n        x = y;\r\n      }\r\n    }\r\n\r\n    return x;\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the natural exponential of `x` rounded to `sd` significant\r\n   * digits.\r\n   *\r\n   * Taylor/Maclaurin series.\r\n   *\r\n   * exp(x) = x^0/0! + x^1/1! + x^2/2! + x^3/3! + ...\r\n   *\r\n   * Argument reduction:\r\n   *   Repeat x = x / 32, k += 5, until |x| < 0.1\r\n   *   exp(x) = exp(x / 2^k)^(2^k)\r\n   *\r\n   * Previously, the argument was initially reduced by\r\n   * exp(x) = exp(r) * 10^k  where r = x - k * ln10, k = floor(x / ln10)\r\n   * to first put r in the range [0, ln10], before dividing by 32 until |x| < 0.1, but this was\r\n   * found to be slower than just dividing repeatedly by 32 as above.\r\n   *\r\n   * Max integer argument: exp('20723265836946413') = 6.3e+9000000000000000\r\n   * Min integer argument: exp('-20723265836946411') = 1.2e-9000000000000000\r\n   * (Math object integer min/max: Math.exp(709) = 8.2e+307, Math.exp(-745) = 5e-324)\r\n   *\r\n   *  exp(Infinity)  = Infinity\r\n   *  exp(-Infinity) = 0\r\n   *  exp(NaN)       = NaN\r\n   *  exp(±0)        = 1\r\n   *\r\n   *  exp(x) is non-terminating for any finite, non-zero x.\r\n   *\r\n   *  The result will always be correctly rounded.\r\n   *\r\n   */\r\n  function naturalExponential(x, sd) {\r\n    var denominator, guard, j, pow, sum, t, wpr,\r\n      rep = 0,\r\n      i = 0,\r\n      k = 0,\r\n      Ctor = x.constructor,\r\n      rm = Ctor.rounding,\r\n      pr = Ctor.precision;\r\n\r\n    // 0/NaN/Infinity?\r\n    if (!x.d || !x.d[0] || x.e > 17) {\r\n\r\n      return new Ctor(x.d\r\n        ? !x.d[0] ? 1 : x.s < 0 ? 0 : 1 / 0\r\n        : x.s ? x.s < 0 ? 0 : x : 0 / 0);\r\n    }\r\n\r\n    if (sd == null) {\r\n      external = false;\r\n      wpr = pr;\r\n    } else {\r\n      wpr = sd;\r\n    }\r\n\r\n    t = new Ctor(0.03125);\r\n\r\n    // while abs(x) >= 0.1\r\n    while (x.e > -2) {\r\n\r\n      // x = x / 2^5\r\n      x = x.times(t);\r\n      k += 5;\r\n    }\r\n\r\n    // Use 2 * log10(2^k) + 5 (empirically derived) to estimate the increase in precision\r\n    // necessary to ensure the first 4 rounding digits are correct.\r\n    guard = Math.log(mathpow(2, k)) / Math.LN10 * 2 + 5 | 0;\r\n    wpr += guard;\r\n    denominator = pow = sum = new Ctor(1);\r\n    Ctor.precision = wpr;\r\n\r\n    for (;;) {\r\n      pow = finalise(pow.times(x), wpr, 1);\r\n      denominator = denominator.times(++i);\r\n      t = sum.plus(divide(pow, denominator, wpr, 1));\r\n\r\n      if (digitsToString(t.d).slice(0, wpr) === digitsToString(sum.d).slice(0, wpr)) {\r\n        j = k;\r\n        while (j--) sum = finalise(sum.times(sum), wpr, 1);\r\n\r\n        // Check to see if the first 4 rounding digits are [49]999.\r\n        // If so, repeat the summation with a higher precision, otherwise\r\n        // e.g. with precision: 18, rounding: 1\r\n        // exp(18.404272462595034083567793919843761) = 98372560.1229999999 (should be 98372560.123)\r\n        // `wpr - guard` is the index of first rounding digit.\r\n        if (sd == null) {\r\n\r\n          if (rep < 3 && checkRoundingDigits(sum.d, wpr - guard, rm, rep)) {\r\n            Ctor.precision = wpr += 10;\r\n            denominator = pow = t = new Ctor(1);\r\n            i = 0;\r\n            rep++;\r\n          } else {\r\n            return finalise(sum, Ctor.precision = pr, rm, external = true);\r\n          }\r\n        } else {\r\n          Ctor.precision = pr;\r\n          return sum;\r\n        }\r\n      }\r\n\r\n      sum = t;\r\n    }\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the natural logarithm of `x` rounded to `sd` significant\r\n   * digits.\r\n   *\r\n   *  ln(-n)        = NaN\r\n   *  ln(0)         = -Infinity\r\n   *  ln(-0)        = -Infinity\r\n   *  ln(1)         = 0\r\n   *  ln(Infinity)  = Infinity\r\n   *  ln(-Infinity) = NaN\r\n   *  ln(NaN)       = NaN\r\n   *\r\n   *  ln(n) (n != 1) is non-terminating.\r\n   *\r\n   */\r\n  function naturalLogarithm(y, sd) {\r\n    var c, c0, denominator, e, numerator, rep, sum, t, wpr, x1, x2,\r\n      n = 1,\r\n      guard = 10,\r\n      x = y,\r\n      xd = x.d,\r\n      Ctor = x.constructor,\r\n      rm = Ctor.rounding,\r\n      pr = Ctor.precision;\r\n\r\n    // Is x negative or Infinity, NaN, 0 or 1?\r\n    if (x.s < 0 || !xd || !xd[0] || !x.e && xd[0] == 1 && xd.length == 1) {\r\n      return new Ctor(xd && !xd[0] ? -1 / 0 : x.s != 1 ? NaN : xd ? 0 : x);\r\n    }\r\n\r\n    if (sd == null) {\r\n      external = false;\r\n      wpr = pr;\r\n    } else {\r\n      wpr = sd;\r\n    }\r\n\r\n    Ctor.precision = wpr += guard;\r\n    c = digitsToString(xd);\r\n    c0 = c.charAt(0);\r\n\r\n    if (Math.abs(e = x.e) < 1.5e15) {\r\n\r\n      // Argument reduction.\r\n      // The series converges faster the closer the argument is to 1, so using\r\n      // ln(a^b) = b * ln(a),   ln(a) = ln(a^b) / b\r\n      // multiply the argument by itself until the leading digits of the significand are 7, 8, 9,\r\n      // 10, 11, 12 or 13, recording the number of multiplications so the sum of the series can\r\n      // later be divided by this number, then separate out the power of 10 using\r\n      // ln(a*10^b) = ln(a) + b*ln(10).\r\n\r\n      // max n is 21 (gives 0.9, 1.0 or 1.1) (9e15 / 21 = 4.2e14).\r\n      //while (c0 < 9 && c0 != 1 || c0 == 1 && c.charAt(1) > 1) {\r\n      // max n is 6 (gives 0.7 - 1.3)\r\n      while (c0 < 7 && c0 != 1 || c0 == 1 && c.charAt(1) > 3) {\r\n        x = x.times(y);\r\n        c = digitsToString(x.d);\r\n        c0 = c.charAt(0);\r\n        n++;\r\n      }\r\n\r\n      e = x.e;\r\n\r\n      if (c0 > 1) {\r\n        x = new Ctor('0.' + c);\r\n        e++;\r\n      } else {\r\n        x = new Ctor(c0 + '.' + c.slice(1));\r\n      }\r\n    } else {\r\n\r\n      // The argument reduction method above may result in overflow if the argument y is a massive\r\n      // number with exponent >= 1500000000000000 (9e15 / 6 = 1.5e15), so instead recall this\r\n      // function using ln(x*10^e) = ln(x) + e*ln(10).\r\n      t = getLn10(Ctor, wpr + 2, pr).times(e + '');\r\n      x = naturalLogarithm(new Ctor(c0 + '.' + c.slice(1)), wpr - guard).plus(t);\r\n      Ctor.precision = pr;\r\n\r\n      return sd == null ? finalise(x, pr, rm, external = true) : x;\r\n    }\r\n\r\n    // x1 is x reduced to a value near 1.\r\n    x1 = x;\r\n\r\n    // Taylor series.\r\n    // ln(y) = ln((1 + x)/(1 - x)) = 2(x + x^3/3 + x^5/5 + x^7/7 + ...)\r\n    // where x = (y - 1)/(y + 1)    (|x| < 1)\r\n    sum = numerator = x = divide(x.minus(1), x.plus(1), wpr, 1);\r\n    x2 = finalise(x.times(x), wpr, 1);\r\n    denominator = 3;\r\n\r\n    for (;;) {\r\n      numerator = finalise(numerator.times(x2), wpr, 1);\r\n      t = sum.plus(divide(numerator, new Ctor(denominator), wpr, 1));\r\n\r\n      if (digitsToString(t.d).slice(0, wpr) === digitsToString(sum.d).slice(0, wpr)) {\r\n        sum = sum.times(2);\r\n\r\n        // Reverse the argument reduction. Check that e is not 0 because, besides preventing an\r\n        // unnecessary calculation, -0 + 0 = +0 and to ensure correct rounding -0 needs to stay -0.\r\n        if (e !== 0) sum = sum.plus(getLn10(Ctor, wpr + 2, pr).times(e + ''));\r\n        sum = divide(sum, new Ctor(n), wpr, 1);\r\n\r\n        // Is rm > 3 and the first 4 rounding digits 4999, or rm < 4 (or the summation has\r\n        // been repeated previously) and the first 4 rounding digits 9999?\r\n        // If so, restart the summation with a higher precision, otherwise\r\n        // e.g. with precision: 12, rounding: 1\r\n        // ln(135520028.6126091714265381533) = 18.7246299999 when it should be 18.72463.\r\n        // `wpr - guard` is the index of first rounding digit.\r\n        if (sd == null) {\r\n          if (checkRoundingDigits(sum.d, wpr - guard, rm, rep)) {\r\n            Ctor.precision = wpr += guard;\r\n            t = numerator = x = divide(x1.minus(1), x1.plus(1), wpr, 1);\r\n            x2 = finalise(x.times(x), wpr, 1);\r\n            denominator = rep = 1;\r\n          } else {\r\n            return finalise(sum, Ctor.precision = pr, rm, external = true);\r\n          }\r\n        } else {\r\n          Ctor.precision = pr;\r\n          return sum;\r\n        }\r\n      }\r\n\r\n      sum = t;\r\n      denominator += 2;\r\n    }\r\n  }\r\n\r\n\r\n  // ±Infinity, NaN.\r\n  function nonFiniteToString(x) {\r\n    // Unsigned.\r\n    return String(x.s * x.s / 0);\r\n  }\r\n\r\n\r\n  /*\r\n   * Parse the value of a new Decimal `x` from string `str`.\r\n   */\r\n  function parseDecimal(x, str) {\r\n    var e, i, len;\r\n\r\n    // Decimal point?\r\n    if ((e = str.indexOf('.')) > -1) str = str.replace('.', '');\r\n\r\n    // Exponential form?\r\n    if ((i = str.search(/e/i)) > 0) {\r\n\r\n      // Determine exponent.\r\n      if (e < 0) e = i;\r\n      e += +str.slice(i + 1);\r\n      str = str.substring(0, i);\r\n    } else if (e < 0) {\r\n\r\n      // Integer.\r\n      e = str.length;\r\n    }\r\n\r\n    // Determine leading zeros.\r\n    for (i = 0; str.charCodeAt(i) === 48; i++);\r\n\r\n    // Determine trailing zeros.\r\n    for (len = str.length; str.charCodeAt(len - 1) === 48; --len);\r\n    str = str.slice(i, len);\r\n\r\n    if (str) {\r\n      len -= i;\r\n      x.e = e = e - i - 1;\r\n      x.d = [];\r\n\r\n      // Transform base\r\n\r\n      // e is the base 10 exponent.\r\n      // i is where to slice str to get the first word of the digits array.\r\n      i = (e + 1) % LOG_BASE;\r\n      if (e < 0) i += LOG_BASE;\r\n\r\n      if (i < len) {\r\n        if (i) x.d.push(+str.slice(0, i));\r\n        for (len -= LOG_BASE; i < len;) x.d.push(+str.slice(i, i += LOG_BASE));\r\n        str = str.slice(i);\r\n        i = LOG_BASE - str.length;\r\n      } else {\r\n        i -= len;\r\n      }\r\n\r\n      for (; i--;) str += '0';\r\n      x.d.push(+str);\r\n\r\n      if (external) {\r\n\r\n        // Overflow?\r\n        if (x.e > x.constructor.maxE) {\r\n\r\n          // Infinity.\r\n          x.d = null;\r\n          x.e = NaN;\r\n\r\n        // Underflow?\r\n        } else if (x.e < x.constructor.minE) {\r\n\r\n          // Zero.\r\n          x.e = 0;\r\n          x.d = [0];\r\n          // x.constructor.underflow = true;\r\n        } // else x.constructor.underflow = false;\r\n      }\r\n    } else {\r\n\r\n      // Zero.\r\n      x.e = 0;\r\n      x.d = [0];\r\n    }\r\n\r\n    return x;\r\n  }\r\n\r\n\r\n  /*\r\n   * Parse the value of a new Decimal `x` from a string `str`, which is not a decimal value.\r\n   */\r\n  function parseOther(x, str) {\r\n    var base, Ctor, divisor, i, isFloat, len, p, xd, xe;\r\n\r\n    if (str === 'Infinity' || str === 'NaN') {\r\n      if (!+str) x.s = NaN;\r\n      x.e = NaN;\r\n      x.d = null;\r\n      return x;\r\n    }\r\n\r\n    if (isHex.test(str))  {\r\n      base = 16;\r\n      str = str.toLowerCase();\r\n    } else if (isBinary.test(str))  {\r\n      base = 2;\r\n    } else if (isOctal.test(str))  {\r\n      base = 8;\r\n    } else {\r\n      throw Error(invalidArgument + str);\r\n    }\r\n\r\n    // Is there a binary exponent part?\r\n    i = str.search(/p/i);\r\n\r\n    if (i > 0) {\r\n      p = +str.slice(i + 1);\r\n      str = str.substring(2, i);\r\n    } else {\r\n      str = str.slice(2);\r\n    }\r\n\r\n    // Convert `str` as an integer then divide the result by `base` raised to a power such that the\r\n    // fraction part will be restored.\r\n    i = str.indexOf('.');\r\n    isFloat = i >= 0;\r\n    Ctor = x.constructor;\r\n\r\n    if (isFloat) {\r\n      str = str.replace('.', '');\r\n      len = str.length;\r\n      i = len - i;\r\n\r\n      // log[10](16) = 1.2041... , log[10](88) = 1.9444....\r\n      divisor = intPow(Ctor, new Ctor(base), i, i * 2);\r\n    }\r\n\r\n    xd = convertBase(str, base, BASE);\r\n    xe = xd.length - 1;\r\n\r\n    // Remove trailing zeros.\r\n    for (i = xe; xd[i] === 0; --i) xd.pop();\r\n    if (i < 0) return new Ctor(x.s * 0);\r\n    x.e = getBase10Exponent(xd, xe);\r\n    x.d = xd;\r\n    external = false;\r\n\r\n    // At what precision to perform the division to ensure exact conversion?\r\n    // maxDecimalIntegerPartDigitCount = ceil(log[10](b) * otherBaseIntegerPartDigitCount)\r\n    // log[10](2) = 0.30103, log[10](8) = 0.90309, log[10](16) = 1.20412\r\n    // E.g. ceil(1.2 * 3) = 4, so up to 4 decimal digits are needed to represent 3 hex int digits.\r\n    // maxDecimalFractionPartDigitCount = {Hex:4|Oct:3|Bin:1} * otherBaseFractionPartDigitCount\r\n    // Therefore using 4 * the number of digits of str will always be enough.\r\n    if (isFloat) x = divide(x, divisor, len * 4);\r\n\r\n    // Multiply by the binary exponent part if present.\r\n    if (p) x = x.times(Math.abs(p) < 54 ? mathpow(2, p) : Decimal.pow(2, p));\r\n    external = true;\r\n\r\n    return x;\r\n  }\r\n\r\n\r\n  /*\r\n   * sin(x) = x - x^3/3! + x^5/5! - ...\r\n   * |x| < pi/2\r\n   *\r\n   */\r\n  function sine(Ctor, x) {\r\n    var k,\r\n      len = x.d.length;\r\n\r\n    if (len < 3) return taylorSeries(Ctor, 2, x, x);\r\n\r\n    // Argument reduction: sin(5x) = 16*sin^5(x) - 20*sin^3(x) + 5*sin(x)\r\n    // i.e. sin(x) = 16*sin^5(x/5) - 20*sin^3(x/5) + 5*sin(x/5)\r\n    // and  sin(x) = sin(x/5)(5 + sin^2(x/5)(16sin^2(x/5) - 20))\r\n\r\n    // Estimate the optimum number of times to use the argument reduction.\r\n    k = 1.4 * Math.sqrt(len);\r\n    k = k > 16 ? 16 : k | 0;\r\n\r\n    x = x.times(1 / tinyPow(5, k));\r\n    x = taylorSeries(Ctor, 2, x, x);\r\n\r\n    // Reverse argument reduction\r\n    var sin2_x,\r\n      d5 = new Ctor(5),\r\n      d16 = new Ctor(16),\r\n      d20 = new Ctor(20);\r\n    for (; k--;) {\r\n      sin2_x = x.times(x);\r\n      x = x.times(d5.plus(sin2_x.times(d16.times(sin2_x).minus(d20))));\r\n    }\r\n\r\n    return x;\r\n  }\r\n\r\n\r\n  // Calculate Taylor series for `cos`, `cosh`, `sin` and `sinh`.\r\n  function taylorSeries(Ctor, n, x, y, isHyperbolic) {\r\n    var j, t, u, x2,\r\n      i = 1,\r\n      pr = Ctor.precision,\r\n      k = Math.ceil(pr / LOG_BASE);\r\n\r\n    external = false;\r\n    x2 = x.times(x);\r\n    u = new Ctor(y);\r\n\r\n    for (;;) {\r\n      t = divide(u.times(x2), new Ctor(n++ * n++), pr, 1);\r\n      u = isHyperbolic ? y.plus(t) : y.minus(t);\r\n      y = divide(t.times(x2), new Ctor(n++ * n++), pr, 1);\r\n      t = u.plus(y);\r\n\r\n      if (t.d[k] !== void 0) {\r\n        for (j = k; t.d[j] === u.d[j] && j--;);\r\n        if (j == -1) break;\r\n      }\r\n\r\n      j = u;\r\n      u = y;\r\n      y = t;\r\n      t = j;\r\n      i++;\r\n    }\r\n\r\n    external = true;\r\n    t.d.length = k + 1;\r\n\r\n    return t;\r\n  }\r\n\r\n\r\n  // Exponent e must be positive and non-zero.\r\n  function tinyPow(b, e) {\r\n    var n = b;\r\n    while (--e) n *= b;\r\n    return n;\r\n  }\r\n\r\n\r\n  // Return the absolute value of `x` reduced to less than or equal to half pi.\r\n  function toLessThanHalfPi(Ctor, x) {\r\n    var t,\r\n      isNeg = x.s < 0,\r\n      pi = getPi(Ctor, Ctor.precision, 1),\r\n      halfPi = pi.times(0.5);\r\n\r\n    x = x.abs();\r\n\r\n    if (x.lte(halfPi)) {\r\n      quadrant = isNeg ? 4 : 1;\r\n      return x;\r\n    }\r\n\r\n    t = x.divToInt(pi);\r\n\r\n    if (t.isZero()) {\r\n      quadrant = isNeg ? 3 : 2;\r\n    } else {\r\n      x = x.minus(t.times(pi));\r\n\r\n      // 0 <= x < pi\r\n      if (x.lte(halfPi)) {\r\n        quadrant = isOdd(t) ? (isNeg ? 2 : 3) : (isNeg ? 4 : 1);\r\n        return x;\r\n      }\r\n\r\n      quadrant = isOdd(t) ? (isNeg ? 1 : 4) : (isNeg ? 3 : 2);\r\n    }\r\n\r\n    return x.minus(pi).abs();\r\n  }\r\n\r\n\r\n  /*\r\n   * Return the value of Decimal `x` as a string in base `baseOut`.\r\n   *\r\n   * If the optional `sd` argument is present include a binary exponent suffix.\r\n   */\r\n  function toStringBinary(x, baseOut, sd, rm) {\r\n    var base, e, i, k, len, roundUp, str, xd, y,\r\n      Ctor = x.constructor,\r\n      isExp = sd !== void 0;\r\n\r\n    if (isExp) {\r\n      checkInt32(sd, 1, MAX_DIGITS);\r\n      if (rm === void 0) rm = Ctor.rounding;\r\n      else checkInt32(rm, 0, 8);\r\n    } else {\r\n      sd = Ctor.precision;\r\n      rm = Ctor.rounding;\r\n    }\r\n\r\n    if (!x.isFinite()) {\r\n      str = nonFiniteToString(x);\r\n    } else {\r\n      str = finiteToString(x);\r\n      i = str.indexOf('.');\r\n\r\n      // Use exponential notation according to `toExpPos` and `toExpNeg`? No, but if required:\r\n      // maxBinaryExponent = floor((decimalExponent + 1) * log[2](10))\r\n      // minBinaryExponent = floor(decimalExponent * log[2](10))\r\n      // log[2](10) = 3.321928094887362347870319429489390175864\r\n\r\n      if (isExp) {\r\n        base = 2;\r\n        if (baseOut == 16) {\r\n          sd = sd * 4 - 3;\r\n        } else if (baseOut == 8) {\r\n          sd = sd * 3 - 2;\r\n        }\r\n      } else {\r\n        base = baseOut;\r\n      }\r\n\r\n      // Convert the number as an integer then divide the result by its base raised to a power such\r\n      // that the fraction part will be restored.\r\n\r\n      // Non-integer.\r\n      if (i >= 0) {\r\n        str = str.replace('.', '');\r\n        y = new Ctor(1);\r\n        y.e = str.length - i;\r\n        y.d = convertBase(finiteToString(y), 10, base);\r\n        y.e = y.d.length;\r\n      }\r\n\r\n      xd = convertBase(str, 10, base);\r\n      e = len = xd.length;\r\n\r\n      // Remove trailing zeros.\r\n      for (; xd[--len] == 0;) xd.pop();\r\n\r\n      if (!xd[0]) {\r\n        str = isExp ? '0p+0' : '0';\r\n      } else {\r\n        if (i < 0) {\r\n          e--;\r\n        } else {\r\n          x = new Ctor(x);\r\n          x.d = xd;\r\n          x.e = e;\r\n          x = divide(x, y, sd, rm, 0, base);\r\n          xd = x.d;\r\n          e = x.e;\r\n          roundUp = inexact;\r\n        }\r\n\r\n        // The rounding digit, i.e. the digit after the digit that may be rounded up.\r\n        i = xd[sd];\r\n        k = base / 2;\r\n        roundUp = roundUp || xd[sd + 1] !== void 0;\r\n\r\n        roundUp = rm < 4\r\n          ? (i !== void 0 || roundUp) && (rm === 0 || rm === (x.s < 0 ? 3 : 2))\r\n          : i > k || i === k && (rm === 4 || roundUp || rm === 6 && xd[sd - 1] & 1 ||\r\n            rm === (x.s < 0 ? 8 : 7));\r\n\r\n        xd.length = sd;\r\n\r\n        if (roundUp) {\r\n\r\n          // Rounding up may mean the previous digit has to be rounded up and so on.\r\n          for (; ++xd[--sd] > base - 1;) {\r\n            xd[sd] = 0;\r\n            if (!sd) {\r\n              ++e;\r\n              xd.unshift(1);\r\n            }\r\n          }\r\n        }\r\n\r\n        // Determine trailing zeros.\r\n        for (len = xd.length; !xd[len - 1]; --len);\r\n\r\n        // E.g. [4, 11, 15] becomes 4bf.\r\n        for (i = 0, str = ''; i < len; i++) str += NUMERALS.charAt(xd[i]);\r\n\r\n        // Add binary exponent suffix?\r\n        if (isExp) {\r\n          if (len > 1) {\r\n            if (baseOut == 16 || baseOut == 8) {\r\n              i = baseOut == 16 ? 4 : 3;\r\n              for (--len; len % i; len++) str += '0';\r\n              xd = convertBase(str, base, baseOut);\r\n              for (len = xd.length; !xd[len - 1]; --len);\r\n\r\n              // xd[0] will always be be 1\r\n              for (i = 1, str = '1.'; i < len; i++) str += NUMERALS.charAt(xd[i]);\r\n            } else {\r\n              str = str.charAt(0) + '.' + str.slice(1);\r\n            }\r\n          }\r\n\r\n          str =  str + (e < 0 ? 'p' : 'p+') + e;\r\n        } else if (e < 0) {\r\n          for (; ++e;) str = '0' + str;\r\n          str = '0.' + str;\r\n        } else {\r\n          if (++e > len) for (e -= len; e-- ;) str += '0';\r\n          else if (e < len) str = str.slice(0, e) + '.' + str.slice(e);\r\n        }\r\n      }\r\n\r\n      str = (baseOut == 16 ? '0x' : baseOut == 2 ? '0b' : baseOut == 8 ? '0o' : '') + str;\r\n    }\r\n\r\n    return x.s < 0 ? '-' + str : str;\r\n  }\r\n\r\n\r\n  // Does not strip trailing zeros.\r\n  function truncate(arr, len) {\r\n    if (arr.length > len) {\r\n      arr.length = len;\r\n      return true;\r\n    }\r\n  }\r\n\r\n\r\n  // Decimal methods\r\n\r\n\r\n  /*\r\n   *  abs\r\n   *  acos\r\n   *  acosh\r\n   *  add\r\n   *  asin\r\n   *  asinh\r\n   *  atan\r\n   *  atanh\r\n   *  atan2\r\n   *  cbrt\r\n   *  ceil\r\n   *  clone\r\n   *  config\r\n   *  cos\r\n   *  cosh\r\n   *  div\r\n   *  exp\r\n   *  floor\r\n   *  hypot\r\n   *  ln\r\n   *  log\r\n   *  log2\r\n   *  log10\r\n   *  max\r\n   *  min\r\n   *  mod\r\n   *  mul\r\n   *  pow\r\n   *  random\r\n   *  round\r\n   *  set\r\n   *  sign\r\n   *  sin\r\n   *  sinh\r\n   *  sqrt\r\n   *  sub\r\n   *  tan\r\n   *  tanh\r\n   *  trunc\r\n   */\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the absolute value of `x`.\r\n   *\r\n   * x {number|string|Decimal}\r\n   *\r\n   */\r\n  function abs(x) {\r\n    return new this(x).abs();\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the arccosine in radians of `x`.\r\n   *\r\n   * x {number|string|Decimal}\r\n   *\r\n   */\r\n  function acos(x) {\r\n    return new this(x).acos();\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the inverse of the hyperbolic cosine of `x`, rounded to\r\n   * `precision` significant digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal} A value in radians.\r\n   *\r\n   */\r\n  function acosh(x) {\r\n    return new this(x).acosh();\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the sum of `x` and `y`, rounded to `precision` significant\r\n   * digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal}\r\n   * y {number|string|Decimal}\r\n   *\r\n   */\r\n  function add(x, y) {\r\n    return new this(x).plus(y);\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the arcsine in radians of `x`, rounded to `precision`\r\n   * significant digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal}\r\n   *\r\n   */\r\n  function asin(x) {\r\n    return new this(x).asin();\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the inverse of the hyperbolic sine of `x`, rounded to\r\n   * `precision` significant digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal} A value in radians.\r\n   *\r\n   */\r\n  function asinh(x) {\r\n    return new this(x).asinh();\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the arctangent in radians of `x`, rounded to `precision`\r\n   * significant digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal}\r\n   *\r\n   */\r\n  function atan(x) {\r\n    return new this(x).atan();\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the inverse of the hyperbolic tangent of `x`, rounded to\r\n   * `precision` significant digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal} A value in radians.\r\n   *\r\n   */\r\n  function atanh(x) {\r\n    return new this(x).atanh();\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the arctangent in radians of `y/x` in the range -pi to pi\r\n   * (inclusive), rounded to `precision` significant digits using rounding mode `rounding`.\r\n   *\r\n   * Domain: [-Infinity, Infinity]\r\n   * Range: [-pi, pi]\r\n   *\r\n   * y {number|string|Decimal} The y-coordinate.\r\n   * x {number|string|Decimal} The x-coordinate.\r\n   *\r\n   * atan2(±0, -0)               = ±pi\r\n   * atan2(±0, +0)               = ±0\r\n   * atan2(±0, -x)               = ±pi for x > 0\r\n   * atan2(±0, x)                = ±0 for x > 0\r\n   * atan2(-y, ±0)               = -pi/2 for y > 0\r\n   * atan2(y, ±0)                = pi/2 for y > 0\r\n   * atan2(±y, -Infinity)        = ±pi for finite y > 0\r\n   * atan2(±y, +Infinity)        = ±0 for finite y > 0\r\n   * atan2(±Infinity, x)         = ±pi/2 for finite x\r\n   * atan2(±Infinity, -Infinity) = ±3*pi/4\r\n   * atan2(±Infinity, +Infinity) = ±pi/4\r\n   * atan2(NaN, x) = NaN\r\n   * atan2(y, NaN) = NaN\r\n   *\r\n   */\r\n  function atan2(y, x) {\r\n    y = new this(y);\r\n    x = new this(x);\r\n    var r,\r\n      pr = this.precision,\r\n      rm = this.rounding,\r\n      wpr = pr + 4;\r\n\r\n    // Either NaN\r\n    if (!y.s || !x.s) {\r\n      r = new this(NaN);\r\n\r\n    // Both ±Infinity\r\n    } else if (!y.d && !x.d) {\r\n      r = getPi(this, wpr, 1).times(x.s > 0 ? 0.25 : 0.75);\r\n      r.s = y.s;\r\n\r\n    // x is ±Infinity or y is ±0\r\n    } else if (!x.d || y.isZero()) {\r\n      r = x.s < 0 ? getPi(this, pr, rm) : new this(0);\r\n      r.s = y.s;\r\n\r\n    // y is ±Infinity or x is ±0\r\n    } else if (!y.d || x.isZero()) {\r\n      r = getPi(this, wpr, 1).times(0.5);\r\n      r.s = y.s;\r\n\r\n    // Both non-zero and finite\r\n    } else if (x.s < 0) {\r\n      this.precision = wpr;\r\n      this.rounding = 1;\r\n      r = this.atan(divide(y, x, wpr, 1));\r\n      x = getPi(this, wpr, 1);\r\n      this.precision = pr;\r\n      this.rounding = rm;\r\n      r = y.s < 0 ? r.minus(x) : r.plus(x);\r\n    } else {\r\n      r = this.atan(divide(y, x, wpr, 1));\r\n    }\r\n\r\n    return r;\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the cube root of `x`, rounded to `precision` significant\r\n   * digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal}\r\n   *\r\n   */\r\n  function cbrt(x) {\r\n    return new this(x).cbrt();\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is `x` rounded to an integer using `ROUND_CEIL`.\r\n   *\r\n   * x {number|string|Decimal}\r\n   *\r\n   */\r\n  function ceil(x) {\r\n    return finalise(x = new this(x), x.e + 1, 2);\r\n  }\r\n\r\n\r\n  /*\r\n   * Configure global settings for a Decimal constructor.\r\n   *\r\n   * `obj` is an object with one or more of the following properties,\r\n   *\r\n   *   precision  {number}\r\n   *   rounding   {number}\r\n   *   toExpNeg   {number}\r\n   *   toExpPos   {number}\r\n   *   maxE       {number}\r\n   *   minE       {number}\r\n   *   modulo     {number}\r\n   *   crypto     {boolean|number}\r\n   *   defaults   {true}\r\n   *\r\n   * E.g. Decimal.config({ precision: 20, rounding: 4 })\r\n   *\r\n   */\r\n  function config(obj) {\r\n    if (!obj || typeof obj !== 'object') throw Error(decimalError + 'Object expected');\r\n    var i, p, v,\r\n      useDefaults = obj.defaults === true,\r\n      ps = [\r\n        'precision', 1, MAX_DIGITS,\r\n        'rounding', 0, 8,\r\n        'toExpNeg', -EXP_LIMIT, 0,\r\n        'toExpPos', 0, EXP_LIMIT,\r\n        'maxE', 0, EXP_LIMIT,\r\n        'minE', -EXP_LIMIT, 0,\r\n        'modulo', 0, 9\r\n      ];\r\n\r\n    for (i = 0; i < ps.length; i += 3) {\r\n      if (p = ps[i], useDefaults) this[p] = DEFAULTS[p];\r\n      if ((v = obj[p]) !== void 0) {\r\n        if (mathfloor(v) === v && v >= ps[i + 1] && v <= ps[i + 2]) this[p] = v;\r\n        else throw Error(invalidArgument + p + ': ' + v);\r\n      }\r\n    }\r\n\r\n    if (p = 'crypto', useDefaults) this[p] = DEFAULTS[p];\r\n    if ((v = obj[p]) !== void 0) {\r\n      if (v === true || v === false || v === 0 || v === 1) {\r\n        if (v) {\r\n          if (typeof crypto != 'undefined' && crypto &&\r\n            (crypto.getRandomValues || crypto.randomBytes)) {\r\n            this[p] = true;\r\n          } else {\r\n            throw Error(cryptoUnavailable);\r\n          }\r\n        } else {\r\n          this[p] = false;\r\n        }\r\n      } else {\r\n        throw Error(invalidArgument + p + ': ' + v);\r\n      }\r\n    }\r\n\r\n    return this;\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the cosine of `x`, rounded to `precision` significant\r\n   * digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal} A value in radians.\r\n   *\r\n   */\r\n  function cos(x) {\r\n    return new this(x).cos();\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the hyperbolic cosine of `x`, rounded to precision\r\n   * significant digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal} A value in radians.\r\n   *\r\n   */\r\n  function cosh(x) {\r\n    return new this(x).cosh();\r\n  }\r\n\r\n\r\n  /*\r\n   * Create and return a Decimal constructor with the same configuration properties as this Decimal\r\n   * constructor.\r\n   *\r\n   */\r\n  function clone(obj) {\r\n    var i, p, ps;\r\n\r\n    /*\r\n     * The Decimal constructor and exported function.\r\n     * Return a new Decimal instance.\r\n     *\r\n     * v {number|string|Decimal} A numeric value.\r\n     *\r\n     */\r\n    function Decimal(v) {\r\n      var e, i, t,\r\n        x = this;\r\n\r\n      // Decimal called without new.\r\n      if (!(x instanceof Decimal)) return new Decimal(v);\r\n\r\n      // Retain a reference to this Decimal constructor, and shadow Decimal.prototype.constructor\r\n      // which points to Object.\r\n      x.constructor = Decimal;\r\n\r\n      // Duplicate.\r\n      if (v instanceof Decimal) {\r\n        x.s = v.s;\r\n\r\n        if (external) {\r\n          if (!v.d || v.e > Decimal.maxE) {\r\n\r\n            // Infinity.\r\n            x.e = NaN;\r\n            x.d = null;\r\n          } else if (v.e < Decimal.minE) {\r\n\r\n            // Zero.\r\n            x.e = 0;\r\n            x.d = [0];\r\n          } else {\r\n            x.e = v.e;\r\n            x.d = v.d.slice();\r\n          }\r\n        } else {\r\n          x.e = v.e;\r\n          x.d = v.d ? v.d.slice() : v.d;\r\n        }\r\n\r\n        return;\r\n      }\r\n\r\n      t = typeof v;\r\n\r\n      if (t === 'number') {\r\n        if (v === 0) {\r\n          x.s = 1 / v < 0 ? -1 : 1;\r\n          x.e = 0;\r\n          x.d = [0];\r\n          return;\r\n        }\r\n\r\n        if (v < 0) {\r\n          v = -v;\r\n          x.s = -1;\r\n        } else {\r\n          x.s = 1;\r\n        }\r\n\r\n        // Fast path for small integers.\r\n        if (v === ~~v && v < 1e7) {\r\n          for (e = 0, i = v; i >= 10; i /= 10) e++;\r\n\r\n          if (external) {\r\n            if (e > Decimal.maxE) {\r\n              x.e = NaN;\r\n              x.d = null;\r\n            } else if (e < Decimal.minE) {\r\n              x.e = 0;\r\n              x.d = [0];\r\n            } else {\r\n              x.e = e;\r\n              x.d = [v];\r\n            }\r\n          } else {\r\n            x.e = e;\r\n            x.d = [v];\r\n          }\r\n\r\n          return;\r\n\r\n        // Infinity, NaN.\r\n        } else if (v * 0 !== 0) {\r\n          if (!v) x.s = NaN;\r\n          x.e = NaN;\r\n          x.d = null;\r\n          return;\r\n        }\r\n\r\n        return parseDecimal(x, v.toString());\r\n\r\n      } else if (t !== 'string') {\r\n        throw Error(invalidArgument + v);\r\n      }\r\n\r\n      // Minus sign?\r\n      if ((i = v.charCodeAt(0)) === 45) {\r\n        v = v.slice(1);\r\n        x.s = -1;\r\n      } else {\r\n        // Plus sign?\r\n        if (i === 43) v = v.slice(1);\r\n        x.s = 1;\r\n      }\r\n\r\n      return isDecimal.test(v) ? parseDecimal(x, v) : parseOther(x, v);\r\n    }\r\n\r\n    Decimal.prototype = P;\r\n\r\n    Decimal.ROUND_UP = 0;\r\n    Decimal.ROUND_DOWN = 1;\r\n    Decimal.ROUND_CEIL = 2;\r\n    Decimal.ROUND_FLOOR = 3;\r\n    Decimal.ROUND_HALF_UP = 4;\r\n    Decimal.ROUND_HALF_DOWN = 5;\r\n    Decimal.ROUND_HALF_EVEN = 6;\r\n    Decimal.ROUND_HALF_CEIL = 7;\r\n    Decimal.ROUND_HALF_FLOOR = 8;\r\n    Decimal.EUCLID = 9;\r\n\r\n    Decimal.config = Decimal.set = config;\r\n    Decimal.clone = clone;\r\n    Decimal.isDecimal = isDecimalInstance;\r\n\r\n    Decimal.abs = abs;\r\n    Decimal.acos = acos;\r\n    Decimal.acosh = acosh;        // ES6\r\n    Decimal.add = add;\r\n    Decimal.asin = asin;\r\n    Decimal.asinh = asinh;        // ES6\r\n    Decimal.atan = atan;\r\n    Decimal.atanh = atanh;        // ES6\r\n    Decimal.atan2 = atan2;\r\n    Decimal.cbrt = cbrt;          // ES6\r\n    Decimal.ceil = ceil;\r\n    Decimal.cos = cos;\r\n    Decimal.cosh = cosh;          // ES6\r\n    Decimal.div = div;\r\n    Decimal.exp = exp;\r\n    Decimal.floor = floor;\r\n    Decimal.hypot = hypot;        // ES6\r\n    Decimal.ln = ln;\r\n    Decimal.log = log;\r\n    Decimal.log10 = log10;        // ES6\r\n    Decimal.log2 = log2;          // ES6\r\n    Decimal.max = max;\r\n    Decimal.min = min;\r\n    Decimal.mod = mod;\r\n    Decimal.mul = mul;\r\n    Decimal.pow = pow;\r\n    Decimal.random = random;\r\n    Decimal.round = round;\r\n    Decimal.sign = sign;          // ES6\r\n    Decimal.sin = sin;\r\n    Decimal.sinh = sinh;          // ES6\r\n    Decimal.sqrt = sqrt;\r\n    Decimal.sub = sub;\r\n    Decimal.tan = tan;\r\n    Decimal.tanh = tanh;          // ES6\r\n    Decimal.trunc = trunc;        // ES6\r\n\r\n    if (obj === void 0) obj = {};\r\n    if (obj) {\r\n      if (obj.defaults !== true) {\r\n        ps = ['precision', 'rounding', 'toExpNeg', 'toExpPos', 'maxE', 'minE', 'modulo', 'crypto'];\r\n        for (i = 0; i < ps.length;) if (!obj.hasOwnProperty(p = ps[i++])) obj[p] = this[p];\r\n      }\r\n    }\r\n\r\n    Decimal.config(obj);\r\n\r\n    return Decimal;\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is `x` divided by `y`, rounded to `precision` significant\r\n   * digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal}\r\n   * y {number|string|Decimal}\r\n   *\r\n   */\r\n  function div(x, y) {\r\n    return new this(x).div(y);\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the natural exponential of `x`, rounded to `precision`\r\n   * significant digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal} The power to which to raise the base of the natural log.\r\n   *\r\n   */\r\n  function exp(x) {\r\n    return new this(x).exp();\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is `x` round to an integer using `ROUND_FLOOR`.\r\n   *\r\n   * x {number|string|Decimal}\r\n   *\r\n   */\r\n  function floor(x) {\r\n    return finalise(x = new this(x), x.e + 1, 3);\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the square root of the sum of the squares of the arguments,\r\n   * rounded to `precision` significant digits using rounding mode `rounding`.\r\n   *\r\n   * hypot(a, b, ...) = sqrt(a^2 + b^2 + ...)\r\n   *\r\n   * arguments {number|string|Decimal}\r\n   *\r\n   */\r\n  function hypot() {\r\n    var i, n,\r\n      t = new this(0);\r\n\r\n    external = false;\r\n\r\n    for (i = 0; i < arguments.length;) {\r\n      n = new this(arguments[i++]);\r\n      if (!n.d) {\r\n        if (n.s) {\r\n          external = true;\r\n          return new this(1 / 0);\r\n        }\r\n        t = n;\r\n      } else if (t.d) {\r\n        t = t.plus(n.times(n));\r\n      }\r\n    }\r\n\r\n    external = true;\r\n\r\n    return t.sqrt();\r\n  }\r\n\r\n\r\n  /*\r\n   * Return true if object is a Decimal instance (where Decimal is any Decimal constructor),\r\n   * otherwise return false.\r\n   *\r\n   */\r\n  function isDecimalInstance(obj) {\r\n    return obj instanceof Decimal || obj && obj.name === '[object Decimal]' || false;\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the natural logarithm of `x`, rounded to `precision`\r\n   * significant digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal}\r\n   *\r\n   */\r\n  function ln(x) {\r\n    return new this(x).ln();\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the log of `x` to the base `y`, or to base 10 if no base\r\n   * is specified, rounded to `precision` significant digits using rounding mode `rounding`.\r\n   *\r\n   * log[y](x)\r\n   *\r\n   * x {number|string|Decimal} The argument of the logarithm.\r\n   * y {number|string|Decimal} The base of the logarithm.\r\n   *\r\n   */\r\n  function log(x, y) {\r\n    return new this(x).log(y);\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the base 2 logarithm of `x`, rounded to `precision`\r\n   * significant digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal}\r\n   *\r\n   */\r\n  function log2(x) {\r\n    return new this(x).log(2);\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the base 10 logarithm of `x`, rounded to `precision`\r\n   * significant digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal}\r\n   *\r\n   */\r\n  function log10(x) {\r\n    return new this(x).log(10);\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the maximum of the arguments.\r\n   *\r\n   * arguments {number|string|Decimal}\r\n   *\r\n   */\r\n  function max() {\r\n    return maxOrMin(this, arguments, 'lt');\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the minimum of the arguments.\r\n   *\r\n   * arguments {number|string|Decimal}\r\n   *\r\n   */\r\n  function min() {\r\n    return maxOrMin(this, arguments, 'gt');\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is `x` modulo `y`, rounded to `precision` significant digits\r\n   * using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal}\r\n   * y {number|string|Decimal}\r\n   *\r\n   */\r\n  function mod(x, y) {\r\n    return new this(x).mod(y);\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is `x` multiplied by `y`, rounded to `precision` significant\r\n   * digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal}\r\n   * y {number|string|Decimal}\r\n   *\r\n   */\r\n  function mul(x, y) {\r\n    return new this(x).mul(y);\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is `x` raised to the power `y`, rounded to precision\r\n   * significant digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal} The base.\r\n   * y {number|string|Decimal} The exponent.\r\n   *\r\n   */\r\n  function pow(x, y) {\r\n    return new this(x).pow(y);\r\n  }\r\n\r\n\r\n  /*\r\n   * Returns a new Decimal with a random value equal to or greater than 0 and less than 1, and with\r\n   * `sd`, or `Decimal.precision` if `sd` is omitted, significant digits (or less if trailing zeros\r\n   * are produced).\r\n   *\r\n   * [sd] {number} Significant digits. Integer, 0 to MAX_DIGITS inclusive.\r\n   *\r\n   */\r\n  function random(sd) {\r\n    var d, e, k, n,\r\n      i = 0,\r\n      r = new this(1),\r\n      rd = [];\r\n\r\n    if (sd === void 0) sd = this.precision;\r\n    else checkInt32(sd, 1, MAX_DIGITS);\r\n\r\n    k = Math.ceil(sd / LOG_BASE);\r\n\r\n    if (!this.crypto) {\r\n      for (; i < k;) rd[i++] = Math.random() * 1e7 | 0;\r\n\r\n    // Browsers supporting crypto.getRandomValues.\r\n    } else if (crypto.getRandomValues) {\r\n      d = crypto.getRandomValues(new Uint32Array(k));\r\n\r\n      for (; i < k;) {\r\n        n = d[i];\r\n\r\n        // 0 <= n < 4294967296\r\n        // Probability n >= 4.29e9, is 4967296 / 4294967296 = 0.00116 (1 in 865).\r\n        if (n >= 4.29e9) {\r\n          d[i] = crypto.getRandomValues(new Uint32Array(1))[0];\r\n        } else {\r\n\r\n          // 0 <= n <= 4289999999\r\n          // 0 <= (n % 1e7) <= 9999999\r\n          rd[i++] = n % 1e7;\r\n        }\r\n      }\r\n\r\n    // Node.js supporting crypto.randomBytes.\r\n    } else if (crypto.randomBytes) {\r\n\r\n      // buffer\r\n      d = crypto.randomBytes(k *= 4);\r\n\r\n      for (; i < k;) {\r\n\r\n        // 0 <= n < 2147483648\r\n        n = d[i] + (d[i + 1] << 8) + (d[i + 2] << 16) + ((d[i + 3] & 0x7f) << 24);\r\n\r\n        // Probability n >= 2.14e9, is 7483648 / 2147483648 = 0.0035 (1 in 286).\r\n        if (n >= 2.14e9) {\r\n          crypto.randomBytes(4).copy(d, i);\r\n        } else {\r\n\r\n          // 0 <= n <= 2139999999\r\n          // 0 <= (n % 1e7) <= 9999999\r\n          rd.push(n % 1e7);\r\n          i += 4;\r\n        }\r\n      }\r\n\r\n      i = k / 4;\r\n    } else {\r\n      throw Error(cryptoUnavailable);\r\n    }\r\n\r\n    k = rd[--i];\r\n    sd %= LOG_BASE;\r\n\r\n    // Convert trailing digits to zeros according to sd.\r\n    if (k && sd) {\r\n      n = mathpow(10, LOG_BASE - sd);\r\n      rd[i] = (k / n | 0) * n;\r\n    }\r\n\r\n    // Remove trailing words which are zero.\r\n    for (; rd[i] === 0; i--) rd.pop();\r\n\r\n    // Zero?\r\n    if (i < 0) {\r\n      e = 0;\r\n      rd = [0];\r\n    } else {\r\n      e = -1;\r\n\r\n      // Remove leading words which are zero and adjust exponent accordingly.\r\n      for (; rd[0] === 0; e -= LOG_BASE) rd.shift();\r\n\r\n      // Count the digits of the first word of rd to determine leading zeros.\r\n      for (k = 1, n = rd[0]; n >= 10; n /= 10) k++;\r\n\r\n      // Adjust the exponent for leading zeros of the first word of rd.\r\n      if (k < LOG_BASE) e -= LOG_BASE - k;\r\n    }\r\n\r\n    r.e = e;\r\n    r.d = rd;\r\n\r\n    return r;\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is `x` rounded to an integer using rounding mode `rounding`.\r\n   *\r\n   * To emulate `Math.round`, set rounding to 7 (ROUND_HALF_CEIL).\r\n   *\r\n   * x {number|string|Decimal}\r\n   *\r\n   */\r\n  function round(x) {\r\n    return finalise(x = new this(x), x.e + 1, this.rounding);\r\n  }\r\n\r\n\r\n  /*\r\n   * Return\r\n   *   1    if x > 0,\r\n   *  -1    if x < 0,\r\n   *   0    if x is 0,\r\n   *  -0    if x is -0,\r\n   *   NaN  otherwise\r\n   *\r\n   * x {number|string|Decimal}\r\n   *\r\n   */\r\n  function sign(x) {\r\n    x = new this(x);\r\n    return x.d ? (x.d[0] ? x.s : 0 * x.s) : x.s || NaN;\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the sine of `x`, rounded to `precision` significant digits\r\n   * using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal} A value in radians.\r\n   *\r\n   */\r\n  function sin(x) {\r\n    return new this(x).sin();\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the hyperbolic sine of `x`, rounded to `precision`\r\n   * significant digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal} A value in radians.\r\n   *\r\n   */\r\n  function sinh(x) {\r\n    return new this(x).sinh();\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the square root of `x`, rounded to `precision` significant\r\n   * digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal}\r\n   *\r\n   */\r\n  function sqrt(x) {\r\n    return new this(x).sqrt();\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is `x` minus `y`, rounded to `precision` significant digits\r\n   * using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal}\r\n   * y {number|string|Decimal}\r\n   *\r\n   */\r\n  function sub(x, y) {\r\n    return new this(x).sub(y);\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the tangent of `x`, rounded to `precision` significant\r\n   * digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal} A value in radians.\r\n   *\r\n   */\r\n  function tan(x) {\r\n    return new this(x).tan();\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is the hyperbolic tangent of `x`, rounded to `precision`\r\n   * significant digits using rounding mode `rounding`.\r\n   *\r\n   * x {number|string|Decimal} A value in radians.\r\n   *\r\n   */\r\n  function tanh(x) {\r\n    return new this(x).tanh();\r\n  }\r\n\r\n\r\n  /*\r\n   * Return a new Decimal whose value is `x` truncated to an integer.\r\n   *\r\n   * x {number|string|Decimal}\r\n   *\r\n   */\r\n  function trunc(x) {\r\n    return finalise(x = new this(x), x.e + 1, 1);\r\n  }\r\n\r\n\r\n  // Create and configure initial Decimal constructor.\r\n  Decimal = clone(DEFAULTS);\r\n\r\n  Decimal['default'] = Decimal.Decimal = Decimal;\r\n\r\n  // Create the internal constants from their string values.\r\n  LN10 = new Decimal(LN10);\r\n  PI = new Decimal(PI);\r\n\r\n\r\n  // Export.\r\n\r\n\r\n  // AMD.\r\n  if (typeof define == 'function' && define.amd) {\r\n    define(function () {\r\n      return Decimal;\r\n    });\r\n\r\n  // Node and other environments that support module.exports.\r\n  } else if (typeof module != 'undefined' && module.exports) {\r\n    if (typeof Symbol == 'function' && typeof Symbol.iterator == 'symbol') {\r\n      P[Symbol.for('nodejs.util.inspect.custom')] = P.toString;\r\n      P[Symbol.toStringTag] = 'Decimal';\r\n    }\r\n\r\n    module.exports = Decimal;\r\n\r\n  // Browser.\r\n  } else {\r\n    if (!globalScope) {\r\n      globalScope = typeof self != 'undefined' && self && self.self == self ? self : window;\r\n    }\r\n\r\n    noConflict = globalScope.Decimal;\r\n    Decimal.noConflict = function () {\r\n      globalScope.Decimal = noConflict;\r\n      return Decimal;\r\n    };\r\n\r\n    globalScope.Decimal = Decimal;\r\n  }\r\n})(this);\r\n","var LanguageService = /** @class */ (function () {\n    function LanguageService(lsKey, defaultLang) {\n        if (defaultLang === void 0) { defaultLang = 'pt'; }\n        this.lsKey = lsKey;\n        this.defaultLang = defaultLang;\n        this.listeners = [];\n        this.document = document;\n        this.setupListener();\n    }\n    LanguageService.prototype.setupListener = function () {\n        var _this = this;\n        if (this.document !== null) {\n            this.document.addEventListener(\"storage\", (function (event) {\n                var e = event;\n                if (e.key === _this.lsKey) {\n                    _this.listeners.forEach(function (l) { return l(); });\n                }\n            }));\n        }\n    };\n    LanguageService.prototype.getLang = function () {\n        var lang = localStorage.getItem(this.lsKey);\n        if (lang === null || lang === undefined) {\n            console.warn(\"Internal Error: User language information has not been set. Returning default...\");\n            return this.getDefaultLang();\n        }\n        return lang;\n    };\n    LanguageService.prototype.getDefaultLang = function () {\n        return this.defaultLang;\n    };\n    LanguageService.prototype.registerLanguageChangeListener = function (listener) {\n        this.listeners.push(listener);\n    };\n    return LanguageService;\n}());\nexport { LanguageService };\n","var LanguageServiceNoLS = /** @class */ (function () {\n    function LanguageServiceNoLS(lang) {\n        this.lang = lang;\n        this.listeners = [];\n    }\n    LanguageServiceNoLS.prototype.setupListener = function () { };\n    LanguageServiceNoLS.prototype.notifyChange = function () {\n        this.listeners.forEach(function (l) { return l(); });\n    };\n    LanguageServiceNoLS.prototype.setLang = function (lang) {\n        this.lang = lang;\n        this.notifyChange();\n    };\n    LanguageServiceNoLS.prototype.getLang = function () {\n        return this.lang;\n    };\n    LanguageServiceNoLS.prototype.getDefaultLang = function () {\n        return this.lang;\n    };\n    LanguageServiceNoLS.prototype.registerLanguageChangeListener = function (listener) {\n        this.listeners.push(listener);\n    };\n    return LanguageServiceNoLS;\n}());\nexport { LanguageServiceNoLS };\n","import { StringTypes } from \"./StringTypes\";\nvar LocalizedStrings = /** @class */ (function () {\n    function LocalizedStrings(service, i18nData, listenToChange) {\n        var _this = this;\n        if (listenToChange === void 0) { listenToChange = false; }\n        this.service = service;\n        this.i18nData = i18nData;\n        this.listenToChange = listenToChange;\n        this.document = document;\n        if (this.listenToChange) {\n            service.registerLanguageChangeListener(function () {\n                _this.updateTagText();\n            });\n        }\n    }\n    LocalizedStrings.prototype.getString = function (id, type) {\n        var i18nObj = this.i18nData[this.service.getLang()];\n        if (!i18nObj) {\n            console.warn(\"Internal Error. The language set at ivprog.lang is not valid: \" + this.service.getLang());\n            return this.getDefaultString(id, type);\n        }\n        if (!i18nObj[type]) {\n            return this.getDefaultString(id, type);\n        }\n        else if (!i18nObj[type][id]) {\n            return this.getDefaultString(id, type);\n        }\n        else {\n            return i18nObj[type][id];\n        }\n    };\n    LocalizedStrings.prototype.getDefaultString = function (id, type) {\n        var i18nObj = this.i18nData[this.service.getDefaultLang()];\n        if (!i18nObj[type]) {\n            return \"{MISSING_I18N_TYPE_IDENTIFIER: \" + type + \"}\";\n        }\n        else if (!i18nObj[type][id]) {\n            return \"{MISSING_I18N_IDENTIFIER: \" + id + \"}\";\n        }\n        else {\n            return i18nObj[type][id];\n        }\n    };\n    LocalizedStrings.prototype.getOR = function () {\n        return this.getUI(\"string_join_or\");\n    };\n    LocalizedStrings.prototype.getError = function (id, context) {\n        if (context === void 0) { context = []; }\n        var text = this.getString(id, StringTypes.ERROR);\n        return this.processString(text, context);\n    };\n    LocalizedStrings.prototype.getMessage = function (id, context) {\n        if (context === void 0) { context = []; }\n        var text = this.getString(id, StringTypes.MESSAGE);\n        return this.processString(text, context);\n    };\n    LocalizedStrings.prototype.getUI = function (id, context) {\n        if (context === void 0) { context = []; }\n        var text = this.getString(id, StringTypes.UI);\n        return this.processString(text, context);\n    };\n    LocalizedStrings.prototype.processString = function (text, context) {\n        for (var i = 0; i < context.length; i++) {\n            var v = context[i];\n            text = text.replace(\"$\" + i, v);\n        }\n        return text;\n    };\n    LocalizedStrings.prototype.updateTagText = function (func) {\n        var _this = this;\n        if (func === void 0) { func = null; }\n        if (this.document !== null) {\n            var list = this.document.querySelectorAll(\"data.i18n\");\n            list.forEach(function (node) {\n                if (func === null) {\n                    node.innerHTML = _this.processTagTex(node.getAttribute(\"value\"));\n                }\n                else {\n                    node.innerHTML = func(node.getAttribute(\"value\"));\n                }\n            });\n        }\n    };\n    LocalizedStrings.prototype.processTagTex = function (text) {\n        if (text === null) {\n            return \"<Invalid i18n identifier>\";\n        }\n        var opts = text.split(\":\");\n        var type = opts[0].toLowerCase();\n        var id = opts[1];\n        if (StringTypes.ERROR === type) {\n            return this.getError(id);\n        }\n        else if (StringTypes.MESSAGE === type) {\n            return this.getMessage(id);\n        }\n        else if (StringTypes.UI === type) {\n            return this.getUI(id);\n        }\n        else {\n            console.warn(\" A string has been passed to the i18n helper function that was not in the form type:id -> \" +\n                text);\n            return this.getString(id, type);\n        }\n    };\n    return LocalizedStrings;\n}());\nexport { LocalizedStrings };\n","export var StringTypes;\n(function (StringTypes) {\n    StringTypes[\"ERROR\"] = \"error\";\n    StringTypes[\"MESSAGE\"] = \"message\";\n    StringTypes[\"UI\"] = \"ui\";\n})(StringTypes || (StringTypes = {}));\n","import { LanguageService } from \"./LanguageService\";\nimport { LocalizedStrings } from \"./LocalizedStrings\";\nimport { StringTypes } from \"./StringTypes\";\nimport { LanguageServiceNoLS } from \"./LanguageServiceNoLS\";\nexport default {\n    LanguageService: LanguageService,\n    LanguageServiceNoLS: LanguageServiceNoLS,\n    LocalizedStrings: LocalizedStrings,\n    StringTypes: StringTypes\n};\n","/**\r\n * DEVELOPED BY\r\n * GIL LOPES BUENO\r\n * gilbueno.mail@gmail.com\r\n *\r\n * WORKS WITH:\r\n * IE8*, IE 9+, FF 4+, SF 5+, WebKit, CH 7+, OP 12+, BESEN, Rhino 1.7+\r\n * For IE8 (and other legacy browsers) WatchJS will use dirty checking  \r\n *\r\n * FORK:\r\n * https://github.com/melanke/Watch.JS\r\n *\r\n * LICENSE: MIT\r\n */\r\n\r\n\"use strict\";\r\n(function (factory) {\r\n    if (typeof exports === 'object') {\r\n        // Node. Does not work with strict CommonJS, but\r\n        // only CommonJS-like enviroments that support module.exports,\r\n        // like Node.\r\n        module.exports = factory();\r\n    } else if (typeof define === 'function' && define.amd) {\r\n        // AMD. Register as an anonymous module.\r\n        define(factory);\r\n    } else {\r\n        // Browser globals\r\n        window.WatchJS = factory();\r\n        window.watch = window.WatchJS.watch;\r\n        window.unwatch = window.WatchJS.unwatch;\r\n        window.callWatchers = window.WatchJS.callWatchers;\r\n    }\r\n}(function () {\r\n\r\n    var WatchJS = {\r\n        noMore: false,        // use WatchJS.suspend(obj) instead\r\n        useDirtyCheck: false, // use only dirty checking to track changes.\r\n        preserveExistingSetters: false\r\n    },\r\n    lengthsubjects = [];\r\n    \r\n    var dirtyChecklist = [];\r\n    var pendingChanges = []; // used coalesce changes from defineProperty and __defineSetter__\r\n    \r\n    var supportDefineProperty = false;\r\n    try {\r\n        supportDefineProperty = Object.defineProperty && Object.defineProperty({},'x', {});\r\n    } catch(ex) {  /* not supported */  }\r\n\r\n    var isFunction = function (functionToCheck) {\r\n        var getType = {};\r\n        return functionToCheck && getType.toString.call(functionToCheck) == '[object Function]';\r\n    };\r\n\r\n    var isInt = function (x) {\r\n        return x % 1 === 0;\r\n    };\r\n\r\n    var isArray = function(obj) {\r\n        return Object.prototype.toString.call(obj) === '[object Array]';\r\n    };\r\n\r\n    var isObject = function(obj) {\r\n        return {}.toString.apply(obj) === '[object Object]';\r\n    };\r\n    \r\n    var getObjDiff = function(a, b){\r\n        var aplus = [],\r\n        bplus = [];\r\n\r\n        if(!(typeof a == \"string\") && !(typeof b == \"string\")){\r\n\r\n            if (isArray(a) && b) {\r\n                for (var i=0; i<a.length; i++) {\r\n                    if (b[i] === undefined) aplus.push(i);\r\n                }\r\n            } else {\r\n                for(var i in a){\r\n                    if (a.hasOwnProperty(i)) {\r\n                        if(b && !b.hasOwnProperty(i)) {\r\n                            aplus.push(i);\r\n                        }\r\n                    }\r\n                }\r\n            }\r\n\r\n            if (isArray(b) && a) {\r\n                for (var j=0; j<b.length; j++) {\r\n                    if (a[j] === undefined) bplus.push(j);\r\n                }\r\n            } else {\r\n                for(var j in b){\r\n                    if (b.hasOwnProperty(j)) {\r\n                        if(a && !a.hasOwnProperty(j)) {\r\n                            bplus.push(j);\r\n                        }\r\n                    }\r\n                }\r\n            }\r\n        }\r\n\r\n        return {\r\n            added: aplus,\r\n            removed: bplus\r\n        }\r\n    };\r\n\r\n    var clone = function(obj){\r\n\r\n        if (null == obj || \"object\" != typeof obj) {\r\n            return obj;\r\n        }\r\n\r\n        var copy = obj.constructor();\r\n\r\n        for (var attr in obj) {\r\n            copy[attr] = obj[attr];\r\n        }\r\n\r\n        return copy;        \r\n\r\n    }\r\n\r\n    var getExistingSetter = function (obj, propName) {\r\n        if (WatchJS.preserveExistingSetters) {\r\n            var existing = Object.getOwnPropertyDescriptor(obj, propName);\r\n            return existing.set;\r\n        }\r\n\r\n        return undefined;\r\n    }\r\n\r\n    var defineGetAndSet = function (obj, propName, getter, setter) {\r\n        try {\r\n            var existingSetter = getExistingSetter(obj, propName);\r\n            Object.defineProperty(obj, propName, {\r\n                get: getter,\r\n                set: function(value) {\r\n                    setter.call(this, value, true); // coalesce changes\r\n                    if (existingSetter) {\r\n                        existingSetter(value);\r\n                    }\r\n                },\r\n                enumerable: true,\r\n                configurable: true\r\n            });\r\n        }\r\n        catch(e1) {\r\n            try{\r\n                Object.prototype.__defineGetter__.call(obj, propName, getter);\r\n                Object.prototype.__defineSetter__.call(obj, propName, function(value) {\r\n                    setter.call(this,value,true); // coalesce changes\r\n                });\r\n            }\r\n            catch(e2) {\r\n                observeDirtyChanges(obj,propName,setter);\r\n                //throw new Error(\"watchJS error: browser not supported :/\")\r\n            }\r\n        }\r\n\r\n    };\r\n\r\n    var defineProp = function (obj, propName, value) {\r\n        try {\r\n            Object.defineProperty(obj, propName, {\r\n                enumerable: false,\r\n                configurable: true,\r\n                writable: false,\r\n                value: value\r\n            });\r\n        } catch(error) {\r\n            obj[propName] = value;\r\n        }\r\n    };\r\n\r\n    var observeDirtyChanges = function(obj,propName,setter) {\r\n        dirtyChecklist[dirtyChecklist.length] = {\r\n            prop:       propName,\r\n            object:     obj,\r\n            orig:       clone(obj[propName]),\r\n            callback:   setter\r\n        }        \r\n    }\r\n    \r\n    var watch = function () {\r\n\r\n        if (isFunction(arguments[1])) {\r\n            watchAll.apply(this, arguments);\r\n        } else if (isArray(arguments[1])) {\r\n            watchMany.apply(this, arguments);\r\n        } else {\r\n            watchOne.apply(this, arguments);\r\n        }\r\n\r\n    };\r\n\r\n\r\n    var watchAll = function (obj, watcher, level, addNRemove) {\r\n\r\n        if ((typeof obj == \"string\") || (!(obj instanceof Object) && !isArray(obj))) { //accepts only objects and array (not string)\r\n            return;\r\n        }\r\n\r\n        if(isArray(obj)) {\r\n            defineWatcher(obj, \"__watchall__\", watcher, level); // watch all changes on the array\r\n            if (level===undefined||level > 0) {\r\n                for (var prop = 0; prop < obj.length; prop++) { // watch objects in array\r\n                   watchAll(obj[prop],watcher,level, addNRemove);\r\n                }\r\n            }\r\n        } \r\n        else {\r\n            var prop,props = [];\r\n            for (prop in obj) { //for each attribute if obj is an object\r\n                if (prop == \"$val\" || (!supportDefineProperty && prop === 'watchers')) {\r\n                    continue;\r\n                }\r\n\r\n                if (Object.prototype.hasOwnProperty.call(obj, prop)) {\r\n                    props.push(prop); //put in the props\r\n                }\r\n            }\r\n            watchMany(obj, props, watcher, level, addNRemove); //watch all items of the props\r\n        }\r\n\r\n\r\n        if (addNRemove) {\r\n            pushToLengthSubjects(obj, \"$$watchlengthsubjectroot\", watcher, level);\r\n        }\r\n    };\r\n\r\n\r\n    var watchMany = function (obj, props, watcher, level, addNRemove) {\r\n\r\n        if ((typeof obj == \"string\") || (!(obj instanceof Object) && !isArray(obj))) { //accepts only objects and array (not string)\r\n            return;\r\n        }\r\n\r\n        for (var i=0; i<props.length; i++) { //watch each property\r\n            var prop = props[i];\r\n            watchOne(obj, prop, watcher, level, addNRemove);\r\n        }\r\n\r\n    };\r\n\r\n    var watchOne = function (obj, prop, watcher, level, addNRemove) {\r\n        if ((typeof obj == \"string\") || (!(obj instanceof Object) && !isArray(obj))) { //accepts only objects and array (not string)\r\n            return;\r\n        }\r\n\r\n        if(isFunction(obj[prop])) { //dont watch if it is a function\r\n            return;\r\n        }\r\n        if(obj[prop] != null && (level === undefined || level > 0)){\r\n            watchAll(obj[prop], watcher, level!==undefined? level-1 : level); //recursively watch all attributes of this\r\n        }\r\n\r\n        defineWatcher(obj, prop, watcher, level);\r\n\r\n        if(addNRemove && (level === undefined || level > 0)){\r\n            pushToLengthSubjects(obj, prop, watcher, level);\r\n        }\r\n\r\n    };\r\n\r\n    var unwatch = function () {\r\n\r\n        if (isFunction(arguments[1])) {\r\n            unwatchAll.apply(this, arguments);\r\n        } else if (isArray(arguments[1])) {\r\n            unwatchMany.apply(this, arguments);\r\n        } else {\r\n            unwatchOne.apply(this, arguments);\r\n        }\r\n\r\n    };\r\n\r\n    var unwatchAll = function (obj, watcher) {\r\n\r\n        if (obj instanceof String || (!(obj instanceof Object) && !isArray(obj))) { //accepts only objects and array (not string)\r\n            return;\r\n        }\r\n\r\n        if (isArray(obj)) {\r\n            var props = ['__watchall__'];\r\n            for (var prop = 0; prop < obj.length; prop++) { //for each item if obj is an array\r\n                props.push(prop); //put in the props\r\n            }\r\n            unwatchMany(obj, props, watcher); //watch all itens of the props\r\n        } else {\r\n            var unwatchPropsInObject = function (obj2) {\r\n                var props = [];\r\n                for (var prop2 in obj2) { //for each attribute if obj is an object\r\n                    if (obj2.hasOwnProperty(prop2)) {\r\n                        if (obj2[prop2] instanceof Object) {\r\n                            unwatchPropsInObject(obj2[prop2]); //recurs into object props\r\n                        } else {\r\n                            props.push(prop2); //put in the props\r\n                        }\r\n                    }\r\n                }\r\n                unwatchMany(obj2, props, watcher); //unwatch all of the props\r\n            };\r\n            unwatchPropsInObject(obj);\r\n        }\r\n    };\r\n\r\n\r\n    var unwatchMany = function (obj, props, watcher) {\r\n\r\n        for (var prop2 in props) { //watch each attribute of \"props\" if is an object\r\n            if (props.hasOwnProperty(prop2)) {\r\n                unwatchOne(obj, props[prop2], watcher);\r\n            }\r\n        }\r\n    };\r\n\r\n    var timeouts = [],\r\n        timerID = null;\r\n    function clearTimerID() {\r\n        timerID = null;\r\n        for(var i=0; i< timeouts.length; i++) {\r\n            timeouts[i]();\r\n        }\r\n        timeouts.length = 0;\r\n    }\r\n    var getTimerID= function () {\r\n        if (!timerID)  {\r\n            timerID = setTimeout(clearTimerID);\r\n        }\r\n        return timerID;\r\n    }\r\n    var registerTimeout = function(fn) { // register function to be called on timeout\r\n        if (timerID==null) getTimerID();\r\n        timeouts[timeouts.length] = fn;\r\n    }\r\n    \r\n    // Track changes made to an array, object or an object's property \r\n    // and invoke callback with a single change object containing type, value, oldvalue and array splices\r\n    // Syntax: \r\n    //      trackChange(obj, callback, recursive, addNRemove)\r\n    //      trackChange(obj, prop, callback, recursive, addNRemove)\r\n    var trackChange = function() {\r\n        var fn = (isFunction(arguments[2])) ? trackProperty : trackObject ;\r\n        fn.apply(this,arguments);\r\n    }\r\n\r\n    // track changes made to an object and invoke callback with a single change object containing type, value and array splices\r\n    var trackObject= function(obj, callback, recursive, addNRemove) {\r\n        var change = null,lastTimerID = -1;\r\n        var isArr = isArray(obj);\r\n        var level,fn = function(prop, action, newValue, oldValue) {\r\n            var timerID = getTimerID();\r\n            if (lastTimerID!==timerID) { // check if timer has changed since last update\r\n                lastTimerID = timerID;\r\n                change = {\r\n                    type: 'update'\r\n                }\r\n                change['value'] = obj;\r\n                change['splices'] = null;\r\n                registerTimeout(function() {\r\n                    callback.call(this,change);\r\n                    change = null;\r\n                });\r\n            }\r\n            // create splices for array changes\r\n            if (isArr && obj === this && change !== null)  {                \r\n                if (action==='pop'||action==='shift') {\r\n                    newValue = [];\r\n                    oldValue = [oldValue];\r\n                }\r\n                else if (action==='push'||action==='unshift') {\r\n                    newValue = [newValue];\r\n                    oldValue = [];\r\n                }\r\n                else if (action!=='splice') { \r\n                    return; // return here - for reverse and sort operations we don't need to return splices. a simple update will do\r\n                }\r\n                if (!change.splices) change.splices = [];\r\n                change.splices[change.splices.length] = {\r\n                    index: prop,\r\n                    deleteCount: oldValue ? oldValue.length : 0,\r\n                    addedCount: newValue ? newValue.length : 0,\r\n                    added: newValue,\r\n                    deleted: oldValue\r\n                };\r\n            }\r\n\r\n        }  \r\n        level = (recursive==true) ? undefined : 0;        \r\n        watchAll(obj,fn, level, addNRemove);\r\n    }\r\n    \r\n    // track changes made to the property of an object and invoke callback with a single change object containing type, value, oldvalue and splices\r\n    var trackProperty = function(obj,prop,callback,recursive, addNRemove) { \r\n        if (obj && prop) {\r\n            watchOne(obj,prop,function(prop, action, newvalue, oldvalue) {\r\n                var change = {\r\n                    type: 'update'\r\n                }\r\n                change['value'] = newvalue;\r\n                change['oldvalue'] = oldvalue;\r\n                if (recursive && isObject(newvalue)||isArray(newvalue)) {\r\n                    trackObject(newvalue,callback,recursive, addNRemove);\r\n                }               \r\n                callback.call(this,change);\r\n            },0)\r\n            \r\n            if (recursive && isObject(obj[prop])||isArray(obj[prop])) {\r\n                trackObject(obj[prop],callback,recursive, addNRemove);\r\n            }                           \r\n        }\r\n    }\r\n    \r\n    \r\n    var defineWatcher = function (obj, prop, watcher, level) {\r\n        var newWatcher = false;\r\n        var isArr = isArray(obj);\r\n        \r\n        if (!obj.watchers) {\r\n            defineProp(obj, \"watchers\", {});\r\n            if (isArr) {\r\n                // watch array functions\r\n                watchFunctions(obj, function(index,action,newValue, oldValue) {\r\n                    addPendingChange(obj, index, action,newValue, oldValue);\r\n                    if (level !== 0 && newValue && (isObject(newValue) || isArray(newValue))) {\r\n                        var i,n, ln, wAll, watchList = obj.watchers[prop];\r\n                        if ((wAll = obj.watchers['__watchall__'])) {\r\n                            watchList = watchList ? watchList.concat(wAll) : wAll;\r\n                        }\r\n                        ln = watchList ?  watchList.length : 0;\r\n                        for (i = 0; i<ln; i++) {\r\n                            if (action!=='splice') {\r\n                                watchAll(newValue, watchList[i], (level===undefined)?level:level-1);\r\n                            }\r\n                            else {\r\n                                // watch spliced values\r\n                                for(n=0; n < newValue.length; n++) {\r\n                                    watchAll(newValue[n], watchList[i], (level===undefined)?level:level-1);\r\n                                }\r\n                            }\r\n                        }\r\n                    }\r\n                });\r\n            }\r\n        }\r\n\r\n        if (!obj.watchers[prop]) {\r\n            obj.watchers[prop] = [];\r\n            if (!isArr) newWatcher = true;\r\n        }\r\n\r\n        for (var i=0; i<obj.watchers[prop].length; i++) {\r\n            if(obj.watchers[prop][i] === watcher){\r\n                return;\r\n            }\r\n        }\r\n\r\n        obj.watchers[prop].push(watcher); //add the new watcher to the watchers array\r\n\r\n        if (newWatcher) {\r\n            var val = obj[prop];            \r\n            var getter = function () {\r\n                return val;                        \r\n            };\r\n\r\n            var setter = function (newval, delayWatcher) {\r\n                var oldval = val;\r\n                val = newval;                \r\n                if (level !== 0 \r\n                    && obj[prop] && (isObject(obj[prop]) || isArray(obj[prop]))\r\n                    && !obj[prop].watchers) {\r\n                    // watch sub properties\r\n                    var i,ln = obj.watchers[prop].length; \r\n                    for(i=0; i<ln; i++) {\r\n                        watchAll(obj[prop], obj.watchers[prop][i], (level===undefined)?level:level-1);\r\n                    }\r\n                }\r\n\r\n                //watchFunctions(obj, prop);\r\n                \r\n                if (isSuspended(obj, prop)) {\r\n                    resume(obj, prop);\r\n                    return;\r\n                }\r\n\r\n                if (!WatchJS.noMore){ // this does not work with Object.observe\r\n                    //if (JSON.stringify(oldval) !== JSON.stringify(newval)) {\r\n                    if (obj[prop] instanceof Date && oldval && newval) {\r\n                        oldval = oldval.valueOf();\r\n                        newval = newval.valueOf();\r\n                    }\t\r\n                    if (oldval !== newval) {\r\n                        if (!delayWatcher) {\r\n                            callWatchers(obj, prop, \"set\", newval, oldval);\r\n                        }\r\n                        else {\r\n                            addPendingChange(obj, prop, \"set\", newval, oldval);\r\n                        }\r\n                        WatchJS.noMore = false;\r\n                    }\r\n                }\r\n            };\r\n\r\n            if (WatchJS.useDirtyCheck) {\r\n                observeDirtyChanges(obj,prop,setter);\r\n            }\r\n            else {\r\n                defineGetAndSet(obj, prop, getter, setter);\r\n            }\r\n        }\r\n\r\n    };\r\n\r\n    var callWatchers = function (obj, prop, action, newval, oldval) {\r\n        if (prop !== undefined) {\r\n            var ln, wl, watchList = obj.watchers[prop];\r\n            if ((wl = obj.watchers['__watchall__'])) {\r\n                watchList = watchList ? watchList.concat(wl) : wl;\r\n            }\r\n            ln = watchList ? watchList.length : 0;\r\n            for (var wr=0; wr< ln; wr++) {\r\n                watchList[wr].call(obj, prop, action, newval, oldval);\r\n            }\r\n        } else {\r\n            for (var prop in obj) {//call all\r\n                if (obj.hasOwnProperty(prop)) {\r\n                    callWatchers(obj, prop, action, newval, oldval);\r\n                }\r\n            }\r\n        }\r\n    };\r\n\r\n    var methodNames = ['pop', 'push', 'reverse', 'shift', 'sort', 'slice', 'unshift', 'splice'];\r\n    var defineArrayMethodWatcher = function (obj, original, methodName, callback) {\r\n        defineProp(obj, methodName, function () {\r\n            var index = 0;\r\n            var i,newValue, oldValue, response;                        \r\n            // get values before splicing array \r\n            if (methodName === 'splice') {\r\n               var start = arguments[0];\r\n               var end = start + arguments[1];\r\n               oldValue = obj.slice(start,end);\r\n               newValue = [];\r\n               for(i=2;i<arguments.length;i++) {\r\n                   newValue[i-2] = arguments[i];\r\n               }\r\n               index = start;\r\n            } \r\n            else {\r\n                newValue = arguments.length > 0 ? arguments[0] : undefined;\r\n            } \r\n\r\n            response = original.apply(obj, arguments);\r\n            if (methodName !== 'slice') {\r\n                if (methodName === 'pop') {\r\n                    oldValue = response;\r\n                    index = obj.length;\r\n                }\r\n                else if (methodName === 'push') {\r\n                    index = obj.length-1;\r\n                }\r\n                else if (methodName === 'shift') {\r\n                    oldValue = response;\r\n                }\r\n                else if (methodName !== 'unshift' && newValue===undefined) {\r\n                    newValue = response;\r\n                }\r\n                callback.call(obj, index, methodName,newValue, oldValue)\r\n            }\r\n            return response;\r\n        });\r\n    };\r\n\r\n    var watchFunctions = function(obj, callback) {\r\n\r\n        if (!isFunction(callback) || !obj || (obj instanceof String) || (!isArray(obj))) {\r\n            return;\r\n        }\r\n\r\n        for (var i = methodNames.length, methodName; i--;) {\r\n            methodName = methodNames[i];\r\n            defineArrayMethodWatcher(obj, obj[methodName], methodName, callback);\r\n        }\r\n\r\n    };\r\n\r\n    var unwatchOne = function (obj, prop, watcher) {\r\n        if (prop) {\r\n            if (obj.watchers && obj.watchers[prop]) {\r\n                if (watcher === undefined) {\r\n                    delete obj.watchers[prop]; // remove all property watchers\r\n                }\r\n                else {\r\n                    for (var i = 0; i < obj.watchers[prop].length; i++) {\r\n                        var w = obj.watchers[prop][i];\r\n                        if (w == watcher) {\r\n                            obj.watchers[prop].splice(i, 1);\r\n                        }\r\n                    }\r\n                }\r\n            }\r\n        } else {\r\n            delete obj.watchers;\r\n        }\r\n\r\n        removeFromLengthSubjects(obj, prop, watcher);\r\n        removeFromDirtyChecklist(obj, prop);\r\n    };\r\n    \r\n    // suspend watchers until next update cycle\r\n    var suspend = function(obj, prop) {\r\n        if (obj.watchers) {\r\n            var name = '__wjs_suspend__'+(prop!==undefined ? prop : '');\r\n            obj.watchers[name] = true;\r\n        }\r\n    }\r\n    \r\n    var isSuspended = function(obj, prop) {\r\n        return obj.watchers \r\n               && (obj.watchers['__wjs_suspend__'] || \r\n                   obj.watchers['__wjs_suspend__'+prop]);\r\n    }\r\n    \r\n    // resumes preivously suspended watchers\r\n    var resume = function(obj, prop) {\r\n        registerTimeout(function() {\r\n            delete obj.watchers['__wjs_suspend__'];\r\n            delete obj.watchers['__wjs_suspend__'+prop];\r\n        })\r\n    }\r\n\r\n    var pendingTimerID = null;\r\n    var addPendingChange = function(obj,prop, mode, newval, oldval) {\r\n        pendingChanges[pendingChanges.length] = {\r\n            obj:obj,\r\n            prop: prop,\r\n            mode: mode,\r\n            newval: newval,\r\n            oldval: oldval\r\n        };\r\n        if (pendingTimerID===null) {\r\n            pendingTimerID = setTimeout(applyPendingChanges);\r\n        }\r\n    };\r\n    \r\n    \r\n    var applyPendingChanges = function()  {\r\n        // apply pending changes\r\n        var change = null;\r\n        pendingTimerID = null;\r\n        for(var i=0;i < pendingChanges.length;i++) {\r\n            change = pendingChanges[i];\r\n            callWatchers(change.obj, change.prop, change.mode, change.newval, change.oldval);\r\n        }\r\n        if (change) {\r\n            pendingChanges = [];\r\n            change = null;\r\n        }        \r\n    }\r\n\r\n    var loop = function(){\r\n\r\n        // check for new or deleted props\r\n        for(var i=0; i<lengthsubjects.length; i++) {\r\n\r\n            var subj = lengthsubjects[i];\r\n\r\n            if (subj.prop === \"$$watchlengthsubjectroot\") {\r\n\r\n                var difference = getObjDiff(subj.obj, subj.actual);\r\n\r\n                if(difference.added.length || difference.removed.length){\r\n                    if(difference.added.length){\r\n                        watchMany(subj.obj, difference.added, subj.watcher, subj.level - 1, true);\r\n                    }\r\n\r\n                    subj.watcher.call(subj.obj, \"root\", \"differentattr\", difference, subj.actual);\r\n                }\r\n                subj.actual = clone(subj.obj);\r\n\r\n\r\n            } else {\r\n\r\n                var difference = getObjDiff(subj.obj[subj.prop], subj.actual);\r\n\r\n                if(difference.added.length || difference.removed.length){\r\n                    if(difference.added.length){\r\n                        for (var j=0; j<subj.obj.watchers[subj.prop].length; j++) {\r\n                            watchMany(subj.obj[subj.prop], difference.added, subj.obj.watchers[subj.prop][j], subj.level - 1, true);\r\n                        }\r\n                    }\r\n\r\n                    callWatchers(subj.obj, subj.prop, \"differentattr\", difference, subj.actual);\r\n                }\r\n\r\n                subj.actual = clone(subj.obj[subj.prop]);\r\n\r\n            }\r\n\r\n        }\r\n        \r\n        // start dirty check\r\n        var n, value;\r\n        if (dirtyChecklist.length > 0) {\r\n            for (var i = 0; i < dirtyChecklist.length; i++) {\r\n                n = dirtyChecklist[i];\r\n                value = n.object[n.prop];\r\n                if (!compareValues(n.orig, value)) {\r\n                    n.orig = clone(value);\r\n                    n.callback(value);\r\n                }\r\n            }\r\n        }\r\n\r\n    };\r\n\r\n    var compareValues =  function(a,b) {\r\n        var i, state = true;\r\n        if (a!==b)  {\r\n            if (isObject(a)) {\r\n                for(i in a) {\r\n                    if (!supportDefineProperty && i==='watchers') continue;\r\n                    if (a[i]!==b[i]) {\r\n                        state = false;\r\n                        break;\r\n                    };\r\n                }\r\n            }\r\n            else {\r\n                state = false;\r\n            }\r\n        }\r\n        return state;\r\n    }\r\n    \r\n    var pushToLengthSubjects = function(obj, prop, watcher, level){\r\n\r\n        var actual;\r\n\r\n        if (prop === \"$$watchlengthsubjectroot\") {\r\n            actual =  clone(obj);\r\n        } else {\r\n            actual = clone(obj[prop]);\r\n        }\r\n\r\n        lengthsubjects.push({\r\n            obj: obj,\r\n            prop: prop,\r\n            actual: actual,\r\n            watcher: watcher,\r\n            level: level\r\n        });\r\n    };\r\n\r\n    var removeFromLengthSubjects = function(obj, prop, watcher){\r\n        for (var i=0; i<lengthsubjects.length; i++) {\r\n            var subj = lengthsubjects[i];\r\n\r\n            if (subj.obj == obj) {\r\n                if (!prop || subj.prop == prop) {\r\n                    if (!watcher || subj.watcher == watcher) {\r\n                        // if we splice off one item at position i\r\n                        // we need to decrement i as the array is one item shorter\r\n                        // so when we increment i in the loop statement we\r\n                        // will land at the correct index.\r\n                        // if it's not decremented, you won't delete all length subjects\r\n                        lengthsubjects.splice(i--, 1);\r\n                    }\r\n                }\r\n            }\r\n        }\r\n\r\n    };\r\n    \r\n    var removeFromDirtyChecklist = function(obj, prop){\r\n        var notInUse;\r\n        for (var i=0; i<dirtyChecklist.length; i++) {\r\n            var n = dirtyChecklist[i];\r\n            var watchers = n.object.watchers;\r\n            notInUse = (\r\n                n.object == obj \r\n                && (!prop || n.prop == prop)\r\n                && watchers\r\n                && (!prop || !watchers[prop] || watchers[prop].length == 0 )\r\n            );\r\n            if (notInUse)  {\r\n                // we use the same syntax as in removeFromLengthSubjects\r\n                dirtyChecklist.splice(i--, 1);\r\n            }\r\n        }\r\n\r\n    };    \r\n\r\n    setInterval(loop, 50);\r\n\r\n    WatchJS.watch = watch;\r\n    WatchJS.unwatch = unwatch;\r\n    WatchJS.callWatchers = callWatchers;\r\n    WatchJS.suspend = suspend; // suspend watchers    \r\n    WatchJS.onChange = trackChange;  // track changes made to object or  it's property and return a single change object\r\n\r\n    return WatchJS;\r\n\r\n}));\r\n","/**\n * Copyright (c) 2014-present, Facebook, Inc.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n */\n\nvar runtime = (function (exports) {\n  \"use strict\";\n\n  var Op = Object.prototype;\n  var hasOwn = Op.hasOwnProperty;\n  var undefined; // More compressible than void 0.\n  var $Symbol = typeof Symbol === \"function\" ? Symbol : {};\n  var iteratorSymbol = $Symbol.iterator || \"@@iterator\";\n  var asyncIteratorSymbol = $Symbol.asyncIterator || \"@@asyncIterator\";\n  var toStringTagSymbol = $Symbol.toStringTag || \"@@toStringTag\";\n\n  function wrap(innerFn, outerFn, self, tryLocsList) {\n    // If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator.\n    var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator;\n    var generator = Object.create(protoGenerator.prototype);\n    var context = new Context(tryLocsList || []);\n\n    // The ._invoke method unifies the implementations of the .next,\n    // .throw, and .return methods.\n    generator._invoke = makeInvokeMethod(innerFn, self, context);\n\n    return generator;\n  }\n  exports.wrap = wrap;\n\n  // Try/catch helper to minimize deoptimizations. Returns a completion\n  // record like context.tryEntries[i].completion. This interface could\n  // have been (and was previously) designed to take a closure to be\n  // invoked without arguments, but in all the cases we care about we\n  // already have an existing method we want to call, so there's no need\n  // to create a new function object. We can even get away with assuming\n  // the method takes exactly one argument, since that happens to be true\n  // in every case, so we don't have to touch the arguments object. The\n  // only additional allocation required is the completion record, which\n  // has a stable shape and so hopefully should be cheap to allocate.\n  function tryCatch(fn, obj, arg) {\n    try {\n      return { type: \"normal\", arg: fn.call(obj, arg) };\n    } catch (err) {\n      return { type: \"throw\", arg: err };\n    }\n  }\n\n  var GenStateSuspendedStart = \"suspendedStart\";\n  var GenStateSuspendedYield = \"suspendedYield\";\n  var GenStateExecuting = \"executing\";\n  var GenStateCompleted = \"completed\";\n\n  // Returning this object from the innerFn has the same effect as\n  // breaking out of the dispatch switch statement.\n  var ContinueSentinel = {};\n\n  // Dummy constructor functions that we use as the .constructor and\n  // .constructor.prototype properties for functions that return Generator\n  // objects. For full spec compliance, you may wish to configure your\n  // minifier not to mangle the names of these two functions.\n  function Generator() {}\n  function GeneratorFunction() {}\n  function GeneratorFunctionPrototype() {}\n\n  // This is a polyfill for %IteratorPrototype% for environments that\n  // don't natively support it.\n  var IteratorPrototype = {};\n  IteratorPrototype[iteratorSymbol] = function () {\n    return this;\n  };\n\n  var getProto = Object.getPrototypeOf;\n  var NativeIteratorPrototype = getProto && getProto(getProto(values([])));\n  if (NativeIteratorPrototype &&\n      NativeIteratorPrototype !== Op &&\n      hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) {\n    // This environment has a native %IteratorPrototype%; use it instead\n    // of the polyfill.\n    IteratorPrototype = NativeIteratorPrototype;\n  }\n\n  var Gp = GeneratorFunctionPrototype.prototype =\n    Generator.prototype = Object.create(IteratorPrototype);\n  GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype;\n  GeneratorFunctionPrototype.constructor = GeneratorFunction;\n  GeneratorFunctionPrototype[toStringTagSymbol] =\n    GeneratorFunction.displayName = \"GeneratorFunction\";\n\n  // Helper for defining the .next, .throw, and .return methods of the\n  // Iterator interface in terms of a single ._invoke method.\n  function defineIteratorMethods(prototype) {\n    [\"next\", \"throw\", \"return\"].forEach(function(method) {\n      prototype[method] = function(arg) {\n        return this._invoke(method, arg);\n      };\n    });\n  }\n\n  exports.isGeneratorFunction = function(genFun) {\n    var ctor = typeof genFun === \"function\" && genFun.constructor;\n    return ctor\n      ? ctor === GeneratorFunction ||\n        // For the native GeneratorFunction constructor, the best we can\n        // do is to check its .name property.\n        (ctor.displayName || ctor.name) === \"GeneratorFunction\"\n      : false;\n  };\n\n  exports.mark = function(genFun) {\n    if (Object.setPrototypeOf) {\n      Object.setPrototypeOf(genFun, GeneratorFunctionPrototype);\n    } else {\n      genFun.__proto__ = GeneratorFunctionPrototype;\n      if (!(toStringTagSymbol in genFun)) {\n        genFun[toStringTagSymbol] = \"GeneratorFunction\";\n      }\n    }\n    genFun.prototype = Object.create(Gp);\n    return genFun;\n  };\n\n  // Within the body of any async function, `await x` is transformed to\n  // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test\n  // `hasOwn.call(value, \"__await\")` to determine if the yielded value is\n  // meant to be awaited.\n  exports.awrap = function(arg) {\n    return { __await: arg };\n  };\n\n  function AsyncIterator(generator, PromiseImpl) {\n    function invoke(method, arg, resolve, reject) {\n      var record = tryCatch(generator[method], generator, arg);\n      if (record.type === \"throw\") {\n        reject(record.arg);\n      } else {\n        var result = record.arg;\n        var value = result.value;\n        if (value &&\n            typeof value === \"object\" &&\n            hasOwn.call(value, \"__await\")) {\n          return PromiseImpl.resolve(value.__await).then(function(value) {\n            invoke(\"next\", value, resolve, reject);\n          }, function(err) {\n            invoke(\"throw\", err, resolve, reject);\n          });\n        }\n\n        return PromiseImpl.resolve(value).then(function(unwrapped) {\n          // When a yielded Promise is resolved, its final value becomes\n          // the .value of the Promise<{value,done}> result for the\n          // current iteration.\n          result.value = unwrapped;\n          resolve(result);\n        }, function(error) {\n          // If a rejected Promise was yielded, throw the rejection back\n          // into the async generator function so it can be handled there.\n          return invoke(\"throw\", error, resolve, reject);\n        });\n      }\n    }\n\n    var previousPromise;\n\n    function enqueue(method, arg) {\n      function callInvokeWithMethodAndArg() {\n        return new PromiseImpl(function(resolve, reject) {\n          invoke(method, arg, resolve, reject);\n        });\n      }\n\n      return previousPromise =\n        // If enqueue has been called before, then we want to wait until\n        // all previous Promises have been resolved before calling invoke,\n        // so that results are always delivered in the correct order. If\n        // enqueue has not been called before, then it is important to\n        // call invoke immediately, without waiting on a callback to fire,\n        // so that the async generator function has the opportunity to do\n        // any necessary setup in a predictable way. This predictability\n        // is why the Promise constructor synchronously invokes its\n        // executor callback, and why async functions synchronously\n        // execute code before the first await. Since we implement simple\n        // async functions in terms of async generators, it is especially\n        // important to get this right, even though it requires care.\n        previousPromise ? previousPromise.then(\n          callInvokeWithMethodAndArg,\n          // Avoid propagating failures to Promises returned by later\n          // invocations of the iterator.\n          callInvokeWithMethodAndArg\n        ) : callInvokeWithMethodAndArg();\n    }\n\n    // Define the unified helper method that is used to implement .next,\n    // .throw, and .return (see defineIteratorMethods).\n    this._invoke = enqueue;\n  }\n\n  defineIteratorMethods(AsyncIterator.prototype);\n  AsyncIterator.prototype[asyncIteratorSymbol] = function () {\n    return this;\n  };\n  exports.AsyncIterator = AsyncIterator;\n\n  // Note that simple async functions are implemented on top of\n  // AsyncIterator objects; they just return a Promise for the value of\n  // the final result produced by the iterator.\n  exports.async = function(innerFn, outerFn, self, tryLocsList, PromiseImpl) {\n    if (PromiseImpl === void 0) PromiseImpl = Promise;\n\n    var iter = new AsyncIterator(\n      wrap(innerFn, outerFn, self, tryLocsList),\n      PromiseImpl\n    );\n\n    return exports.isGeneratorFunction(outerFn)\n      ? iter // If outerFn is a generator, return the full iterator.\n      : iter.next().then(function(result) {\n          return result.done ? result.value : iter.next();\n        });\n  };\n\n  function makeInvokeMethod(innerFn, self, context) {\n    var state = GenStateSuspendedStart;\n\n    return function invoke(method, arg) {\n      if (state === GenStateExecuting) {\n        throw new Error(\"Generator is already running\");\n      }\n\n      if (state === GenStateCompleted) {\n        if (method === \"throw\") {\n          throw arg;\n        }\n\n        // Be forgiving, per 25.3.3.3.3 of the spec:\n        // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume\n        return doneResult();\n      }\n\n      context.method = method;\n      context.arg = arg;\n\n      while (true) {\n        var delegate = context.delegate;\n        if (delegate) {\n          var delegateResult = maybeInvokeDelegate(delegate, context);\n          if (delegateResult) {\n            if (delegateResult === ContinueSentinel) continue;\n            return delegateResult;\n          }\n        }\n\n        if (context.method === \"next\") {\n          // Setting context._sent for legacy support of Babel's\n          // function.sent implementation.\n          context.sent = context._sent = context.arg;\n\n        } else if (context.method === \"throw\") {\n          if (state === GenStateSuspendedStart) {\n            state = GenStateCompleted;\n            throw context.arg;\n          }\n\n          context.dispatchException(context.arg);\n\n        } else if (context.method === \"return\") {\n          context.abrupt(\"return\", context.arg);\n        }\n\n        state = GenStateExecuting;\n\n        var record = tryCatch(innerFn, self, context);\n        if (record.type === \"normal\") {\n          // If an exception is thrown from innerFn, we leave state ===\n          // GenStateExecuting and loop back for another invocation.\n          state = context.done\n            ? GenStateCompleted\n            : GenStateSuspendedYield;\n\n          if (record.arg === ContinueSentinel) {\n            continue;\n          }\n\n          return {\n            value: record.arg,\n            done: context.done\n          };\n\n        } else if (record.type === \"throw\") {\n          state = GenStateCompleted;\n          // Dispatch the exception by looping back around to the\n          // context.dispatchException(context.arg) call above.\n          context.method = \"throw\";\n          context.arg = record.arg;\n        }\n      }\n    };\n  }\n\n  // Call delegate.iterator[context.method](context.arg) and handle the\n  // result, either by returning a { value, done } result from the\n  // delegate iterator, or by modifying context.method and context.arg,\n  // setting context.delegate to null, and returning the ContinueSentinel.\n  function maybeInvokeDelegate(delegate, context) {\n    var method = delegate.iterator[context.method];\n    if (method === undefined) {\n      // A .throw or .return when the delegate iterator has no .throw\n      // method always terminates the yield* loop.\n      context.delegate = null;\n\n      if (context.method === \"throw\") {\n        // Note: [\"return\"] must be used for ES3 parsing compatibility.\n        if (delegate.iterator[\"return\"]) {\n          // If the delegate iterator has a return method, give it a\n          // chance to clean up.\n          context.method = \"return\";\n          context.arg = undefined;\n          maybeInvokeDelegate(delegate, context);\n\n          if (context.method === \"throw\") {\n            // If maybeInvokeDelegate(context) changed context.method from\n            // \"return\" to \"throw\", let that override the TypeError below.\n            return ContinueSentinel;\n          }\n        }\n\n        context.method = \"throw\";\n        context.arg = new TypeError(\n          \"The iterator does not provide a 'throw' method\");\n      }\n\n      return ContinueSentinel;\n    }\n\n    var record = tryCatch(method, delegate.iterator, context.arg);\n\n    if (record.type === \"throw\") {\n      context.method = \"throw\";\n      context.arg = record.arg;\n      context.delegate = null;\n      return ContinueSentinel;\n    }\n\n    var info = record.arg;\n\n    if (! info) {\n      context.method = \"throw\";\n      context.arg = new TypeError(\"iterator result is not an object\");\n      context.delegate = null;\n      return ContinueSentinel;\n    }\n\n    if (info.done) {\n      // Assign the result of the finished delegate to the temporary\n      // variable specified by delegate.resultName (see delegateYield).\n      context[delegate.resultName] = info.value;\n\n      // Resume execution at the desired location (see delegateYield).\n      context.next = delegate.nextLoc;\n\n      // If context.method was \"throw\" but the delegate handled the\n      // exception, let the outer generator proceed normally. If\n      // context.method was \"next\", forget context.arg since it has been\n      // \"consumed\" by the delegate iterator. If context.method was\n      // \"return\", allow the original .return call to continue in the\n      // outer generator.\n      if (context.method !== \"return\") {\n        context.method = \"next\";\n        context.arg = undefined;\n      }\n\n    } else {\n      // Re-yield the result returned by the delegate method.\n      return info;\n    }\n\n    // The delegate iterator is finished, so forget it and continue with\n    // the outer generator.\n    context.delegate = null;\n    return ContinueSentinel;\n  }\n\n  // Define Generator.prototype.{next,throw,return} in terms of the\n  // unified ._invoke helper method.\n  defineIteratorMethods(Gp);\n\n  Gp[toStringTagSymbol] = \"Generator\";\n\n  // A Generator should always return itself as the iterator object when the\n  // @@iterator function is called on it. Some browsers' implementations of the\n  // iterator prototype chain incorrectly implement this, causing the Generator\n  // object to not be returned from this call. This ensures that doesn't happen.\n  // See https://github.com/facebook/regenerator/issues/274 for more details.\n  Gp[iteratorSymbol] = function() {\n    return this;\n  };\n\n  Gp.toString = function() {\n    return \"[object Generator]\";\n  };\n\n  function pushTryEntry(locs) {\n    var entry = { tryLoc: locs[0] };\n\n    if (1 in locs) {\n      entry.catchLoc = locs[1];\n    }\n\n    if (2 in locs) {\n      entry.finallyLoc = locs[2];\n      entry.afterLoc = locs[3];\n    }\n\n    this.tryEntries.push(entry);\n  }\n\n  function resetTryEntry(entry) {\n    var record = entry.completion || {};\n    record.type = \"normal\";\n    delete record.arg;\n    entry.completion = record;\n  }\n\n  function Context(tryLocsList) {\n    // The root entry object (effectively a try statement without a catch\n    // or a finally block) gives us a place to store values thrown from\n    // locations where there is no enclosing try statement.\n    this.tryEntries = [{ tryLoc: \"root\" }];\n    tryLocsList.forEach(pushTryEntry, this);\n    this.reset(true);\n  }\n\n  exports.keys = function(object) {\n    var keys = [];\n    for (var key in object) {\n      keys.push(key);\n    }\n    keys.reverse();\n\n    // Rather than returning an object with a next method, we keep\n    // things simple and return the next function itself.\n    return function next() {\n      while (keys.length) {\n        var key = keys.pop();\n        if (key in object) {\n          next.value = key;\n          next.done = false;\n          return next;\n        }\n      }\n\n      // To avoid creating an additional object, we just hang the .value\n      // and .done properties off the next function object itself. This\n      // also ensures that the minifier will not anonymize the function.\n      next.done = true;\n      return next;\n    };\n  };\n\n  function values(iterable) {\n    if (iterable) {\n      var iteratorMethod = iterable[iteratorSymbol];\n      if (iteratorMethod) {\n        return iteratorMethod.call(iterable);\n      }\n\n      if (typeof iterable.next === \"function\") {\n        return iterable;\n      }\n\n      if (!isNaN(iterable.length)) {\n        var i = -1, next = function next() {\n          while (++i < iterable.length) {\n            if (hasOwn.call(iterable, i)) {\n              next.value = iterable[i];\n              next.done = false;\n              return next;\n            }\n          }\n\n          next.value = undefined;\n          next.done = true;\n\n          return next;\n        };\n\n        return next.next = next;\n      }\n    }\n\n    // Return an iterator with no values.\n    return { next: doneResult };\n  }\n  exports.values = values;\n\n  function doneResult() {\n    return { value: undefined, done: true };\n  }\n\n  Context.prototype = {\n    constructor: Context,\n\n    reset: function(skipTempReset) {\n      this.prev = 0;\n      this.next = 0;\n      // Resetting context._sent for legacy support of Babel's\n      // function.sent implementation.\n      this.sent = this._sent = undefined;\n      this.done = false;\n      this.delegate = null;\n\n      this.method = \"next\";\n      this.arg = undefined;\n\n      this.tryEntries.forEach(resetTryEntry);\n\n      if (!skipTempReset) {\n        for (var name in this) {\n          // Not sure about the optimal order of these conditions:\n          if (name.charAt(0) === \"t\" &&\n              hasOwn.call(this, name) &&\n              !isNaN(+name.slice(1))) {\n            this[name] = undefined;\n          }\n        }\n      }\n    },\n\n    stop: function() {\n      this.done = true;\n\n      var rootEntry = this.tryEntries[0];\n      var rootRecord = rootEntry.completion;\n      if (rootRecord.type === \"throw\") {\n        throw rootRecord.arg;\n      }\n\n      return this.rval;\n    },\n\n    dispatchException: function(exception) {\n      if (this.done) {\n        throw exception;\n      }\n\n      var context = this;\n      function handle(loc, caught) {\n        record.type = \"throw\";\n        record.arg = exception;\n        context.next = loc;\n\n        if (caught) {\n          // If the dispatched exception was caught by a catch block,\n          // then let that catch block handle the exception normally.\n          context.method = \"next\";\n          context.arg = undefined;\n        }\n\n        return !! caught;\n      }\n\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        var record = entry.completion;\n\n        if (entry.tryLoc === \"root\") {\n          // Exception thrown outside of any try block that could handle\n          // it, so set the completion value of the entire function to\n          // throw the exception.\n          return handle(\"end\");\n        }\n\n        if (entry.tryLoc <= this.prev) {\n          var hasCatch = hasOwn.call(entry, \"catchLoc\");\n          var hasFinally = hasOwn.call(entry, \"finallyLoc\");\n\n          if (hasCatch && hasFinally) {\n            if (this.prev < entry.catchLoc) {\n              return handle(entry.catchLoc, true);\n            } else if (this.prev < entry.finallyLoc) {\n              return handle(entry.finallyLoc);\n            }\n\n          } else if (hasCatch) {\n            if (this.prev < entry.catchLoc) {\n              return handle(entry.catchLoc, true);\n            }\n\n          } else if (hasFinally) {\n            if (this.prev < entry.finallyLoc) {\n              return handle(entry.finallyLoc);\n            }\n\n          } else {\n            throw new Error(\"try statement without catch or finally\");\n          }\n        }\n      }\n    },\n\n    abrupt: function(type, arg) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.tryLoc <= this.prev &&\n            hasOwn.call(entry, \"finallyLoc\") &&\n            this.prev < entry.finallyLoc) {\n          var finallyEntry = entry;\n          break;\n        }\n      }\n\n      if (finallyEntry &&\n          (type === \"break\" ||\n           type === \"continue\") &&\n          finallyEntry.tryLoc <= arg &&\n          arg <= finallyEntry.finallyLoc) {\n        // Ignore the finally entry if control is not jumping to a\n        // location outside the try/catch block.\n        finallyEntry = null;\n      }\n\n      var record = finallyEntry ? finallyEntry.completion : {};\n      record.type = type;\n      record.arg = arg;\n\n      if (finallyEntry) {\n        this.method = \"next\";\n        this.next = finallyEntry.finallyLoc;\n        return ContinueSentinel;\n      }\n\n      return this.complete(record);\n    },\n\n    complete: function(record, afterLoc) {\n      if (record.type === \"throw\") {\n        throw record.arg;\n      }\n\n      if (record.type === \"break\" ||\n          record.type === \"continue\") {\n        this.next = record.arg;\n      } else if (record.type === \"return\") {\n        this.rval = this.arg = record.arg;\n        this.method = \"return\";\n        this.next = \"end\";\n      } else if (record.type === \"normal\" && afterLoc) {\n        this.next = afterLoc;\n      }\n\n      return ContinueSentinel;\n    },\n\n    finish: function(finallyLoc) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.finallyLoc === finallyLoc) {\n          this.complete(entry.completion, entry.afterLoc);\n          resetTryEntry(entry);\n          return ContinueSentinel;\n        }\n      }\n    },\n\n    \"catch\": function(tryLoc) {\n      for (var i = this.tryEntries.length - 1; i >= 0; --i) {\n        var entry = this.tryEntries[i];\n        if (entry.tryLoc === tryLoc) {\n          var record = entry.completion;\n          if (record.type === \"throw\") {\n            var thrown = record.arg;\n            resetTryEntry(entry);\n          }\n          return thrown;\n        }\n      }\n\n      // The context.catch method must only be called with a location\n      // argument that corresponds to a known catch block.\n      throw new Error(\"illegal catch attempt\");\n    },\n\n    delegateYield: function(iterable, resultName, nextLoc) {\n      this.delegate = {\n        iterator: values(iterable),\n        resultName: resultName,\n        nextLoc: nextLoc\n      };\n\n      if (this.method === \"next\") {\n        // Deliberately forget the last sent value so that we don't\n        // accidentally pass it on to the delegate.\n        this.arg = undefined;\n      }\n\n      return ContinueSentinel;\n    }\n  };\n\n  // Regardless of whether this script is executing as a CommonJS module\n  // or not, return the runtime object so that we can declare the variable\n  // regeneratorRuntime in the outer scope, which allows this module to be\n  // injected easily by `bin/regenerator --include-runtime script.js`.\n  return exports;\n\n}(\n  // If this script is executing as a CommonJS module, use module.exports\n  // as the regeneratorRuntime namespace. Otherwise create a new empty\n  // object. Either way, the resulting object will be used to initialize\n  // the regeneratorRuntime variable at the top of this file.\n  typeof module === \"object\" ? module.exports : {}\n));\n\ntry {\n  regeneratorRuntime = runtime;\n} catch (accidentalStrictMode) {\n  // This module should not be running in strict mode, so the above\n  // assignment should always work unless something is misconfigured. Just\n  // in case runtime.js accidentally runs in strict mode, we can escape\n  // strict mode using a global Function call. This could conceivably fail\n  // if a Content Security Policy forbids using Function, but in that case\n  // the proper solution is to fix the accidental strict mode problem. If\n  // you've misconfigured your bundler to force strict mode and applied a\n  // CSP to forbid Function, and you're not willing to fix either of those\n  // problems, please detail your unique predicament in a GitHub issue.\n  Function(\"r\", \"regeneratorRuntime = r\")(runtime);\n}\n"],"sourceRoot":""}