iassign/ilm/iVProg/1.0.20200221/ivprog/js/vendors~main.685d1cf2ece1ed4ebb99.js

(window["webpackJsonpivprogCore"] = window["webpackJsonpivprogCore"] || []).push([["vendors~main"],{

/***/ "./node_modules/@babel/runtime/helpers/arrayLikeToArray.js":
/*!*****************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/arrayLikeToArray.js ***!
  \*****************************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

function _arrayLikeToArray(arr, len) {
  if (len == null || len > arr.length) len = arr.length;

  for (var i = 0, arr2 = new Array(len); i < len; i++) {
    arr2[i] = arr[i];
  }

  return arr2;
}

module.exports = _arrayLikeToArray;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/arrayWithHoles.js":
/*!***************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/arrayWithHoles.js ***!
  \***************************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

function _arrayWithHoles(arr) {
  if (Array.isArray(arr)) return arr;
}

module.exports = _arrayWithHoles;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/arrayWithoutHoles.js":
/*!******************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/arrayWithoutHoles.js ***!
  \******************************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

var arrayLikeToArray = __webpack_require__(/*! ./arrayLikeToArray */ "./node_modules/@babel/runtime/helpers/arrayLikeToArray.js");

function _arrayWithoutHoles(arr) {
  if (Array.isArray(arr)) return arrayLikeToArray(arr);
}

module.exports = _arrayWithoutHoles;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/assertThisInitialized.js":
/*!**********************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/assertThisInitialized.js ***!
  \**********************************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

function _assertThisInitialized(self) {
  if (self === void 0) {
    throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
  }

  return self;
}

module.exports = _assertThisInitialized;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/asyncToGenerator.js":
/*!*****************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/asyncToGenerator.js ***!
  \*****************************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

function asyncGeneratorStep(gen, resolve, reject, _next, _throw, key, arg) {
  try {
    var info = gen[key](arg);
    var value = info.value;
  } catch (error) {
    reject(error);
    return;
  }

  if (info.done) {
    resolve(value);
  } else {
    Promise.resolve(value).then(_next, _throw);
  }
}

function _asyncToGenerator(fn) {
  return function () {
    var self = this,
        args = arguments;
    return new Promise(function (resolve, reject) {
      var gen = fn.apply(self, args);

      function _next(value) {
        asyncGeneratorStep(gen, resolve, reject, _next, _throw, "next", value);
      }

      function _throw(err) {
        asyncGeneratorStep(gen, resolve, reject, _next, _throw, "throw", err);
      }

      _next(undefined);
    });
  };
}

module.exports = _asyncToGenerator;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/classCallCheck.js":
/*!***************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/classCallCheck.js ***!
  \***************************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

function _classCallCheck(instance, Constructor) {
  if (!(instance instanceof Constructor)) {
    throw new TypeError("Cannot call a class as a function");
  }
}

module.exports = _classCallCheck;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/construct.js":
/*!**********************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/construct.js ***!
  \**********************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

var setPrototypeOf = __webpack_require__(/*! ./setPrototypeOf */ "./node_modules/@babel/runtime/helpers/setPrototypeOf.js");

var isNativeReflectConstruct = __webpack_require__(/*! ./isNativeReflectConstruct */ "./node_modules/@babel/runtime/helpers/isNativeReflectConstruct.js");

function _construct(Parent, args, Class) {
  if (isNativeReflectConstruct()) {
    module.exports = _construct = Reflect.construct;
  } else {
    module.exports = _construct = function _construct(Parent, args, Class) {
      var a = [null];
      a.push.apply(a, args);
      var Constructor = Function.bind.apply(Parent, a);
      var instance = new Constructor();
      if (Class) setPrototypeOf(instance, Class.prototype);
      return instance;
    };
  }

  return _construct.apply(null, arguments);
}

module.exports = _construct;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/createClass.js":
/*!************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/createClass.js ***!
  \************************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

function _defineProperties(target, props) {
  for (var i = 0; i < props.length; i++) {
    var descriptor = props[i];
    descriptor.enumerable = descriptor.enumerable || false;
    descriptor.configurable = true;
    if ("value" in descriptor) descriptor.writable = true;
    Object.defineProperty(target, descriptor.key, descriptor);
  }
}

function _createClass(Constructor, protoProps, staticProps) {
  if (protoProps) _defineProperties(Constructor.prototype, protoProps);
  if (staticProps) _defineProperties(Constructor, staticProps);
  return Constructor;
}

module.exports = _createClass;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/getPrototypeOf.js":
/*!***************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/getPrototypeOf.js ***!
  \***************************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

function _getPrototypeOf(o) {
  module.exports = _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) {
    return o.__proto__ || Object.getPrototypeOf(o);
  };
  return _getPrototypeOf(o);
}

module.exports = _getPrototypeOf;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/inherits.js":
/*!*********************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/inherits.js ***!
  \*********************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

var setPrototypeOf = __webpack_require__(/*! ./setPrototypeOf */ "./node_modules/@babel/runtime/helpers/setPrototypeOf.js");

function _inherits(subClass, superClass) {
  if (typeof superClass !== "function" && superClass !== null) {
    throw new TypeError("Super expression must either be null or a function");
  }

  subClass.prototype = Object.create(superClass && superClass.prototype, {
    constructor: {
      value: subClass,
      writable: true,
      configurable: true
    }
  });
  if (superClass) setPrototypeOf(subClass, superClass);
}

module.exports = _inherits;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/isNativeFunction.js":
/*!*****************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/isNativeFunction.js ***!
  \*****************************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

function _isNativeFunction(fn) {
  return Function.toString.call(fn).indexOf("[native code]") !== -1;
}

module.exports = _isNativeFunction;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/isNativeReflectConstruct.js":
/*!*************************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/isNativeReflectConstruct.js ***!
  \*************************************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

function _isNativeReflectConstruct() {
  if (typeof Reflect === "undefined" || !Reflect.construct) return false;
  if (Reflect.construct.sham) return false;
  if (typeof Proxy === "function") return true;

  try {
    Date.prototype.toString.call(Reflect.construct(Date, [], function () {}));
    return true;
  } catch (e) {
    return false;
  }
}

module.exports = _isNativeReflectConstruct;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/iterableToArray.js":
/*!****************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/iterableToArray.js ***!
  \****************************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

function _iterableToArray(iter) {
  if (typeof Symbol !== "undefined" && Symbol.iterator in Object(iter)) return Array.from(iter);
}

module.exports = _iterableToArray;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/iterableToArrayLimit.js":
/*!*********************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/iterableToArrayLimit.js ***!
  \*********************************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

function _iterableToArrayLimit(arr, i) {
  if (typeof Symbol === "undefined" || !(Symbol.iterator in Object(arr))) return;
  var _arr = [];
  var _n = true;
  var _d = false;
  var _e = undefined;

  try {
    for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {
      _arr.push(_s.value);

      if (i && _arr.length === i) break;
    }
  } catch (err) {
    _d = true;
    _e = err;
  } finally {
    try {
      if (!_n && _i["return"] != null) _i["return"]();
    } finally {
      if (_d) throw _e;
    }
  }

  return _arr;
}

module.exports = _iterableToArrayLimit;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/nonIterableRest.js":
/*!****************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/nonIterableRest.js ***!
  \****************************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

function _nonIterableRest() {
  throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
}

module.exports = _nonIterableRest;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/nonIterableSpread.js":
/*!******************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/nonIterableSpread.js ***!
  \******************************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

function _nonIterableSpread() {
  throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
}

module.exports = _nonIterableSpread;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/possibleConstructorReturn.js":
/*!**************************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/possibleConstructorReturn.js ***!
  \**************************************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

var _typeof = __webpack_require__(/*! ../helpers/typeof */ "./node_modules/@babel/runtime/helpers/typeof.js");

var assertThisInitialized = __webpack_require__(/*! ./assertThisInitialized */ "./node_modules/@babel/runtime/helpers/assertThisInitialized.js");

function _possibleConstructorReturn(self, call) {
  if (call && (_typeof(call) === "object" || typeof call === "function")) {
    return call;
  }

  return assertThisInitialized(self);
}

module.exports = _possibleConstructorReturn;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/setPrototypeOf.js":
/*!***************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/setPrototypeOf.js ***!
  \***************************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

function _setPrototypeOf(o, p) {
  module.exports = _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) {
    o.__proto__ = p;
    return o;
  };

  return _setPrototypeOf(o, p);
}

module.exports = _setPrototypeOf;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/slicedToArray.js":
/*!**************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/slicedToArray.js ***!
  \**************************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

var arrayWithHoles = __webpack_require__(/*! ./arrayWithHoles */ "./node_modules/@babel/runtime/helpers/arrayWithHoles.js");

var iterableToArrayLimit = __webpack_require__(/*! ./iterableToArrayLimit */ "./node_modules/@babel/runtime/helpers/iterableToArrayLimit.js");

var unsupportedIterableToArray = __webpack_require__(/*! ./unsupportedIterableToArray */ "./node_modules/@babel/runtime/helpers/unsupportedIterableToArray.js");

var nonIterableRest = __webpack_require__(/*! ./nonIterableRest */ "./node_modules/@babel/runtime/helpers/nonIterableRest.js");

function _slicedToArray(arr, i) {
  return arrayWithHoles(arr) || iterableToArrayLimit(arr, i) || unsupportedIterableToArray(arr, i) || nonIterableRest();
}

module.exports = _slicedToArray;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/toConsumableArray.js":
/*!******************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/toConsumableArray.js ***!
  \******************************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

var arrayWithoutHoles = __webpack_require__(/*! ./arrayWithoutHoles */ "./node_modules/@babel/runtime/helpers/arrayWithoutHoles.js");

var iterableToArray = __webpack_require__(/*! ./iterableToArray */ "./node_modules/@babel/runtime/helpers/iterableToArray.js");

var unsupportedIterableToArray = __webpack_require__(/*! ./unsupportedIterableToArray */ "./node_modules/@babel/runtime/helpers/unsupportedIterableToArray.js");

var nonIterableSpread = __webpack_require__(/*! ./nonIterableSpread */ "./node_modules/@babel/runtime/helpers/nonIterableSpread.js");

function _toConsumableArray(arr) {
  return arrayWithoutHoles(arr) || iterableToArray(arr) || unsupportedIterableToArray(arr) || nonIterableSpread();
}

module.exports = _toConsumableArray;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/typeof.js":
/*!*******************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/typeof.js ***!
  \*******************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

function _typeof(obj) {
  "@babel/helpers - typeof";

  if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
    module.exports = _typeof = function _typeof(obj) {
      return typeof obj;
    };
  } else {
    module.exports = _typeof = function _typeof(obj) {
      return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
    };
  }

  return _typeof(obj);
}

module.exports = _typeof;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/unsupportedIterableToArray.js":
/*!***************************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/unsupportedIterableToArray.js ***!
  \***************************************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

var arrayLikeToArray = __webpack_require__(/*! ./arrayLikeToArray */ "./node_modules/@babel/runtime/helpers/arrayLikeToArray.js");

function _unsupportedIterableToArray(o, minLen) {
  if (!o) return;
  if (typeof o === "string") return arrayLikeToArray(o, minLen);
  var n = Object.prototype.toString.call(o).slice(8, -1);
  if (n === "Object" && o.constructor) n = o.constructor.name;
  if (n === "Map" || n === "Set") return Array.from(o);
  if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return arrayLikeToArray(o, minLen);
}

module.exports = _unsupportedIterableToArray;

/***/ }),

/***/ "./node_modules/@babel/runtime/helpers/wrapNativeSuper.js":
/*!****************************************************************!*\
  !*** ./node_modules/@babel/runtime/helpers/wrapNativeSuper.js ***!
  \****************************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

var getPrototypeOf = __webpack_require__(/*! ./getPrototypeOf */ "./node_modules/@babel/runtime/helpers/getPrototypeOf.js");

var setPrototypeOf = __webpack_require__(/*! ./setPrototypeOf */ "./node_modules/@babel/runtime/helpers/setPrototypeOf.js");

var isNativeFunction = __webpack_require__(/*! ./isNativeFunction */ "./node_modules/@babel/runtime/helpers/isNativeFunction.js");

var construct = __webpack_require__(/*! ./construct */ "./node_modules/@babel/runtime/helpers/construct.js");

function _wrapNativeSuper(Class) {
  var _cache = typeof Map === "function" ? new Map() : undefined;

  module.exports = _wrapNativeSuper = function _wrapNativeSuper(Class) {
    if (Class === null || !isNativeFunction(Class)) return Class;

    if (typeof Class !== "function") {
      throw new TypeError("Super expression must either be null or a function");
    }

    if (typeof _cache !== "undefined") {
      if (_cache.has(Class)) return _cache.get(Class);

      _cache.set(Class, Wrapper);
    }

    function Wrapper() {
      return construct(Class, arguments, getPrototypeOf(this).constructor);
    }

    Wrapper.prototype = Object.create(Class.prototype, {
      constructor: {
        value: Wrapper,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
    return setPrototypeOf(Wrapper, Class);
  };

  return _wrapNativeSuper(Class);
}

module.exports = _wrapNativeSuper;

/***/ }),

/***/ "./node_modules/@babel/runtime/regenerator/index.js":
/*!**********************************************************!*\
  !*** ./node_modules/@babel/runtime/regenerator/index.js ***!
  \**********************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

module.exports = __webpack_require__(/*! regenerator-runtime */ "./node_modules/regenerator-runtime/runtime.js");


/***/ }),

/***/ "./node_modules/antlr4/BufferedTokenStream.js":
/*!****************************************************!*\
  !*** ./node_modules/antlr4/BufferedTokenStream.js ***!
  \****************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

// This implementation of {@link TokenStream} loads tokens from a
// {@link TokenSource} on-demand, and places the tokens in a buffer to provide
// access to any previous token by index.
//
// <p>
// This token stream ignores the value of {@link Token//getChannel}. If your
// parser requires the token stream filter tokens to only those on a particular
// channel, such as {@link Token//DEFAULT_CHANNEL} or
// {@link Token//HIDDEN_CHANNEL}, use a filtering token stream such a
// {@link CommonTokenStream}.</p>

var Token = __webpack_require__(/*! ./Token */ "./node_modules/antlr4/Token.js").Token;
var Lexer = __webpack_require__(/*! ./Lexer */ "./node_modules/antlr4/Lexer.js").Lexer;
var Interval = __webpack_require__(/*! ./IntervalSet */ "./node_modules/antlr4/IntervalSet.js").Interval;

// this is just to keep meaningful parameter types to Parser
function TokenStream() {
	return this;
}

function BufferedTokenStream(tokenSource) {

	TokenStream.call(this);
	// The {@link TokenSource} from which tokens for this stream are fetched.
	this.tokenSource = tokenSource;

	// A collection of all tokens fetched from the token source. The list is
	// considered a complete view of the input once {@link //fetchedEOF} is set
	// to {@code true}.
	this.tokens = [];

	// The index into {@link //tokens} of the current token (next token to
	// {@link //consume}). {@link //tokens}{@code [}{@link //p}{@code ]} should
	// be
	// {@link //LT LT(1)}.
	//
	// <p>This field is set to -1 when the stream is first constructed or when
	// {@link //setTokenSource} is called, indicating that the first token has
	// not yet been fetched from the token source. For additional information,
	// see the documentation of {@link IntStream} for a description of
	// Initializing Methods.</p>
	this.index = -1;

	// Indicates whether the {@link Token//EOF} token has been fetched from
	// {@link //tokenSource} and added to {@link //tokens}. This field improves
	// performance for the following cases:
	//
	// <ul>
	// <li>{@link //consume}: The lookahead check in {@link //consume} to
	// prevent
	// consuming the EOF symbol is optimized by checking the values of
	// {@link //fetchedEOF} and {@link //p} instead of calling {@link
	// //LA}.</li>
	// <li>{@link //fetch}: The check to prevent adding multiple EOF symbols
	// into
	// {@link //tokens} is trivial with this field.</li>
	// <ul>
	this.fetchedEOF = false;
	return this;
}

BufferedTokenStream.prototype = Object.create(TokenStream.prototype);
BufferedTokenStream.prototype.constructor = BufferedTokenStream;

BufferedTokenStream.prototype.mark = function() {
	return 0;
};

BufferedTokenStream.prototype.release = function(marker) {
	// no resources to release
};

BufferedTokenStream.prototype.reset = function() {
	this.seek(0);
};

BufferedTokenStream.prototype.seek = function(index) {
	this.lazyInit();
	this.index = this.adjustSeekIndex(index);
};

BufferedTokenStream.prototype.get = function(index) {
	this.lazyInit();
	return this.tokens[index];
};

BufferedTokenStream.prototype.consume = function() {
	var skipEofCheck = false;
	if (this.index >= 0) {
		if (this.fetchedEOF) {
			// the last token in tokens is EOF. skip check if p indexes any
			// fetched token except the last.
			skipEofCheck = this.index < this.tokens.length - 1;
		} else {
			// no EOF token in tokens. skip check if p indexes a fetched token.
			skipEofCheck = this.index < this.tokens.length;
		}
	} else {
		// not yet initialized
		skipEofCheck = false;
	}
	if (!skipEofCheck && this.LA(1) === Token.EOF) {
		throw "cannot consume EOF";
	}
	if (this.sync(this.index + 1)) {
		this.index = this.adjustSeekIndex(this.index + 1);
	}
};

// Make sure index {@code i} in tokens has a token.
//
// @return {@code true} if a token is located at index {@code i}, otherwise
// {@code false}.
// @see //get(int i)
// /
BufferedTokenStream.prototype.sync = function(i) {
	var n = i - this.tokens.length + 1; // how many more elements we need?
	if (n > 0) {
		var fetched = this.fetch(n);
		return fetched >= n;
	}
	return true;
};

// Add {@code n} elements to buffer.
//
// @return The actual number of elements added to the buffer.
// /
BufferedTokenStream.prototype.fetch = function(n) {
	if (this.fetchedEOF) {
		return 0;
	}
	for (var i = 0; i < n; i++) {
		var t = this.tokenSource.nextToken();
		t.tokenIndex = this.tokens.length;
		this.tokens.push(t);
		if (t.type === Token.EOF) {
			this.fetchedEOF = true;
			return i + 1;
		}
	}
	return n;
};

// Get all tokens from start..stop inclusively///
BufferedTokenStream.prototype.getTokens = function(start, stop, types) {
	if (types === undefined) {
		types = null;
	}
	if (start < 0 || stop < 0) {
		return null;
	}
	this.lazyInit();
	var subset = [];
	if (stop >= this.tokens.length) {
		stop = this.tokens.length - 1;
	}
	for (var i = start; i < stop; i++) {
		var t = this.tokens[i];
		if (t.type === Token.EOF) {
			break;
		}
		if (types === null || types.contains(t.type)) {
			subset.push(t);
		}
	}
	return subset;
};

BufferedTokenStream.prototype.LA = function(i) {
	return this.LT(i).type;
};

BufferedTokenStream.prototype.LB = function(k) {
	if (this.index - k < 0) {
		return null;
	}
	return this.tokens[this.index - k];
};

BufferedTokenStream.prototype.LT = function(k) {
	this.lazyInit();
	if (k === 0) {
		return null;
	}
	if (k < 0) {
		return this.LB(-k);
	}
	var i = this.index + k - 1;
	this.sync(i);
	if (i >= this.tokens.length) { // return EOF token
		// EOF must be last token
		return this.tokens[this.tokens.length - 1];
	}
	return this.tokens[i];
};

// Allowed derived classes to modify the behavior of operations which change
// the current stream position by adjusting the target token index of a seek
// operation. The default implementation simply returns {@code i}. If an
// exception is thrown in this method, the current stream index should not be
// changed.
//
// <p>For example, {@link CommonTokenStream} overrides this method to ensure
// that
// the seek target is always an on-channel token.</p>
//
// @param i The target token index.
// @return The adjusted target token index.

BufferedTokenStream.prototype.adjustSeekIndex = function(i) {
	return i;
};

BufferedTokenStream.prototype.lazyInit = function() {
	if (this.index === -1) {
		this.setup();
	}
};

BufferedTokenStream.prototype.setup = function() {
	this.sync(0);
	this.index = this.adjustSeekIndex(0);
};

// Reset this token stream by setting its token source.///
BufferedTokenStream.prototype.setTokenSource = function(tokenSource) {
	this.tokenSource = tokenSource;
	this.tokens = [];
	this.index = -1;
	this.fetchedEOF = false;
};


// Given a starting index, return the index of the next token on channel.
// Return i if tokens[i] is on channel. Return -1 if there are no tokens
// on channel between i and EOF.
// /
BufferedTokenStream.prototype.nextTokenOnChannel = function(i, channel) {
	this.sync(i);
	if (i >= this.tokens.length) {
		return -1;
	}
	var token = this.tokens[i];
	while (token.channel !== this.channel) {
		if (token.type === Token.EOF) {
			return -1;
		}
		i += 1;
		this.sync(i);
		token = this.tokens[i];
	}
	return i;
};

// Given a starting index, return the index of the previous token on channel.
// Return i if tokens[i] is on channel. Return -1 if there are no tokens
// on channel between i and 0.
BufferedTokenStream.prototype.previousTokenOnChannel = function(i, channel) {
	while (i >= 0 && this.tokens[i].channel !== channel) {
		i -= 1;
	}
	return i;
};

// Collect all tokens on specified channel to the right of
// the current token up until we see a token on DEFAULT_TOKEN_CHANNEL or
// EOF. If channel is -1, find any non default channel token.
BufferedTokenStream.prototype.getHiddenTokensToRight = function(tokenIndex,
		channel) {
	if (channel === undefined) {
		channel = -1;
	}
	this.lazyInit();
	if (tokenIndex < 0 || tokenIndex >= this.tokens.length) {
		throw "" + tokenIndex + " not in 0.." + this.tokens.length - 1;
	}
	var nextOnChannel = this.nextTokenOnChannel(tokenIndex + 1, Lexer.DEFAULT_TOKEN_CHANNEL);
	var from_ = tokenIndex + 1;
	// if none onchannel to right, nextOnChannel=-1 so set to = last token
	var to = nextOnChannel === -1 ? this.tokens.length - 1 : nextOnChannel;
	return this.filterForChannel(from_, to, channel);
};

// Collect all tokens on specified channel to the left of
// the current token up until we see a token on DEFAULT_TOKEN_CHANNEL.
// If channel is -1, find any non default channel token.
BufferedTokenStream.prototype.getHiddenTokensToLeft = function(tokenIndex,
		channel) {
	if (channel === undefined) {
		channel = -1;
	}
	this.lazyInit();
	if (tokenIndex < 0 || tokenIndex >= this.tokens.length) {
		throw "" + tokenIndex + " not in 0.." + this.tokens.length - 1;
	}
	var prevOnChannel = this.previousTokenOnChannel(tokenIndex - 1, Lexer.DEFAULT_TOKEN_CHANNEL);
	if (prevOnChannel === tokenIndex - 1) {
		return null;
	}
	// if none on channel to left, prevOnChannel=-1 then from=0
	var from_ = prevOnChannel + 1;
	var to = tokenIndex - 1;
	return this.filterForChannel(from_, to, channel);
};

BufferedTokenStream.prototype.filterForChannel = function(left, right, channel) {
	var hidden = [];
	for (var i = left; i < right + 1; i++) {
		var t = this.tokens[i];
		if (channel === -1) {
			if (t.channel !== Lexer.DEFAULT_TOKEN_CHANNEL) {
				hidden.push(t);
			}
		} else if (t.channel === channel) {
			hidden.push(t);
		}
	}
	if (hidden.length === 0) {
		return null;
	}
	return hidden;
};

BufferedTokenStream.prototype.getSourceName = function() {
	return this.tokenSource.getSourceName();
};

// Get the text of all tokens in this buffer.///
BufferedTokenStream.prototype.getText = function(interval) {
	this.lazyInit();
	this.fill();
	if (interval === undefined || interval === null) {
		interval = new Interval(0, this.tokens.length - 1);
	}
	var start = interval.start;
	if (start instanceof Token) {
		start = start.tokenIndex;
	}
	var stop = interval.stop;
	if (stop instanceof Token) {
		stop = stop.tokenIndex;
	}
	if (start === null || stop === null || start < 0 || stop < 0) {
		return "";
	}
	if (stop >= this.tokens.length) {
		stop = this.tokens.length - 1;
	}
	var s = "";
	for (var i = start; i < stop + 1; i++) {
		var t = this.tokens[i];
		if (t.type === Token.EOF) {
			break;
		}
		s = s + t.text;
	}
	return s;
};

// Get all tokens from lexer until EOF///
BufferedTokenStream.prototype.fill = function() {
	this.lazyInit();
	while (this.fetch(1000) === 1000) {
		continue;
	}
};

exports.BufferedTokenStream = BufferedTokenStream;


/***/ }),

/***/ "./node_modules/antlr4/CharStreams.js":
/*!********************************************!*\
  !*** ./node_modules/antlr4/CharStreams.js ***!
  \********************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
//

var InputStream = __webpack_require__(/*! ./InputStream */ "./node_modules/antlr4/InputStream.js").InputStream;

var isNodeJs = typeof window === 'undefined' && typeof importScripts === 'undefined';
var fs = isNodeJs ? __webpack_require__(/*! fs */ "./node_modules/node-libs-browser/mock/empty.js") : null;

// Utility functions to create InputStreams from various sources.
//
// All returned InputStreams support the full range of Unicode
// up to U+10FFFF (the default behavior of InputStream only supports
// code points up to U+FFFF).
var CharStreams = {
  // Creates an InputStream from a string.
  fromString: function(str) {
    return new InputStream(str, true);
  },

  // Asynchronously creates an InputStream from a blob given the
  // encoding of the bytes in that blob (defaults to 'utf8' if
  // encoding is null).
  //
  // Invokes onLoad(result) on success, onError(error) on
  // failure.
  fromBlob: function(blob, encoding, onLoad, onError) {
    var reader = FileReader();
    reader.onload = function(e) {
      var is = new InputStream(e.target.result, true);
      onLoad(is);
    };
    reader.onerror = onError;
    reader.readAsText(blob, encoding);
  },

  // Creates an InputStream from a Buffer given the
  // encoding of the bytes in that buffer (defaults to 'utf8' if
  // encoding is null).
  fromBuffer: function(buffer, encoding) {
    return new InputStream(buffer.toString(encoding), true);
  },

  // Asynchronously creates an InputStream from a file on disk given
  // the encoding of the bytes in that file (defaults to 'utf8' if
  // encoding is null).
  //
  // Invokes callback(error, result) on completion.
  fromPath: function(path, encoding, callback) {
    fs.readFile(path, encoding, function(err, data) {
      var is = null;
      if (data !== null) {
        is = new InputStream(data, true);
      }
      callback(err, is);
    });
  },

  // Synchronously creates an InputStream given a path to a file
  // on disk and the encoding of the bytes in that file (defaults to
  // 'utf8' if encoding is null).
  fromPathSync: function(path, encoding) {
    var data = fs.readFileSync(path, encoding);
    return new InputStream(data, true);
  }
};

exports.CharStreams = CharStreams;


/***/ }),

/***/ "./node_modules/antlr4/CommonTokenFactory.js":
/*!***************************************************!*\
  !*** ./node_modules/antlr4/CommonTokenFactory.js ***!
  \***************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
//

//
// This default implementation of {@link TokenFactory} creates
// {@link CommonToken} objects.
//

var CommonToken = __webpack_require__(/*! ./Token */ "./node_modules/antlr4/Token.js").CommonToken;

function TokenFactory() {
	return this;
}

function CommonTokenFactory(copyText) {
	TokenFactory.call(this);
    // Indicates whether {@link CommonToken//setText} should be called after
    // constructing tokens to explicitly set the text. This is useful for cases
    // where the input stream might not be able to provide arbitrary substrings
    // of text from the input after the lexer creates a token (e.g. the
    // implementation of {@link CharStream//getText} in
    // {@link UnbufferedCharStream} throws an
    // {@link UnsupportedOperationException}). Explicitly setting the token text
    // allows {@link Token//getText} to be called at any time regardless of the
    // input stream implementation.
    //
    // <p>
    // The default value is {@code false} to avoid the performance and memory
    // overhead of copying text for every token unless explicitly requested.</p>
    //
    this.copyText = copyText===undefined ? false : copyText;
	return this;
}

CommonTokenFactory.prototype = Object.create(TokenFactory.prototype);
CommonTokenFactory.prototype.constructor = CommonTokenFactory;

//
// The default {@link CommonTokenFactory} instance.
//
// <p>
// This token factory does not explicitly copy token text when constructing
// tokens.</p>
//
CommonTokenFactory.DEFAULT = new CommonTokenFactory();

CommonTokenFactory.prototype.create = function(source, type, text, channel, start, stop, line, column) {
    var t = new CommonToken(source, type, channel, start, stop);
    t.line = line;
    t.column = column;
    if (text !==null) {
        t.text = text;
    } else if (this.copyText && source[1] !==null) {
        t.text = source[1].getText(start,stop);
    }
    return t;
};

CommonTokenFactory.prototype.createThin = function(type, text) {
    var t = new CommonToken(null, type);
    t.text = text;
    return t;
};

exports.CommonTokenFactory = CommonTokenFactory;


/***/ }),

/***/ "./node_modules/antlr4/CommonTokenStream.js":
/*!**************************************************!*\
  !*** ./node_modules/antlr4/CommonTokenStream.js ***!
  \**************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
///

//
// This class extends {@link BufferedTokenStream} with functionality to filter
// token streams to tokens on a particular channel (tokens where
// {@link Token//getChannel} returns a particular value).
//
// <p>
// This token stream provides access to all tokens by index or when calling
// methods like {@link //getText}. The channel filtering is only used for code
// accessing tokens via the lookahead methods {@link //LA}, {@link //LT}, and
// {@link //LB}.</p>
//
// <p>
// By default, tokens are placed on the default channel
// ({@link Token//DEFAULT_CHANNEL}), but may be reassigned by using the
// {@code ->channel(HIDDEN)} lexer command, or by using an embedded action to
// call {@link Lexer//setChannel}.
// </p>
//
// <p>
// Note: lexer rules which use the {@code ->skip} lexer command or call
// {@link Lexer//skip} do not produce tokens at all, so input text matched by
// such a rule will not be available as part of the token stream, regardless of
// channel.</p>
///

var Token = __webpack_require__(/*! ./Token */ "./node_modules/antlr4/Token.js").Token;
var BufferedTokenStream = __webpack_require__(/*! ./BufferedTokenStream */ "./node_modules/antlr4/BufferedTokenStream.js").BufferedTokenStream;

function CommonTokenStream(lexer, channel) {
	BufferedTokenStream.call(this, lexer);
    this.channel = channel===undefined ? Token.DEFAULT_CHANNEL : channel;
    return this;
}

CommonTokenStream.prototype = Object.create(BufferedTokenStream.prototype);
CommonTokenStream.prototype.constructor = CommonTokenStream;

CommonTokenStream.prototype.adjustSeekIndex = function(i) {
    return this.nextTokenOnChannel(i, this.channel);
};

CommonTokenStream.prototype.LB = function(k) {
    if (k===0 || this.index-k<0) {
        return null;
    }
    var i = this.index;
    var n = 1;
    // find k good tokens looking backwards
    while (n <= k) {
        // skip off-channel tokens
        i = this.previousTokenOnChannel(i - 1, this.channel);
        n += 1;
    }
    if (i < 0) {
        return null;
    }
    return this.tokens[i];
};

CommonTokenStream.prototype.LT = function(k) {
    this.lazyInit();
    if (k === 0) {
        return null;
    }
    if (k < 0) {
        return this.LB(-k);
    }
    var i = this.index;
    var n = 1; // we know tokens[pos] is a good one
    // find k good tokens
    while (n < k) {
        // skip off-channel tokens, but make sure to not look past EOF
        if (this.sync(i + 1)) {
            i = this.nextTokenOnChannel(i + 1, this.channel);
        }
        n += 1;
    }
    return this.tokens[i];
};

// Count EOF just once.///
CommonTokenStream.prototype.getNumberOfOnChannelTokens = function() {
    var n = 0;
    this.fill();
    for (var i =0; i< this.tokens.length;i++) {
        var t = this.tokens[i];
        if( t.channel===this.channel) {
            n += 1;
        }
        if( t.type===Token.EOF) {
            break;
        }
    }
    return n;
};

exports.CommonTokenStream = CommonTokenStream;

/***/ }),

/***/ "./node_modules/antlr4/FileStream.js":
/*!*******************************************!*\
  !*** ./node_modules/antlr4/FileStream.js ***!
  \*******************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
//

//
//  This is an InputStream that is loaded from a file all at once
//  when you construct the object.
//
var InputStream = __webpack_require__(/*! ./InputStream */ "./node_modules/antlr4/InputStream.js").InputStream;
var isNodeJs = typeof window === 'undefined' && typeof importScripts === 'undefined';
var fs = isNodeJs ? __webpack_require__(/*! fs */ "./node_modules/node-libs-browser/mock/empty.js") : null;

function FileStream(fileName, decodeToUnicodeCodePoints) {
	var data = fs.readFileSync(fileName, "utf8");
	InputStream.call(this, data, decodeToUnicodeCodePoints);
	this.fileName = fileName;
	return this;
}

FileStream.prototype = Object.create(InputStream.prototype);
FileStream.prototype.constructor = FileStream;

exports.FileStream = FileStream;


/***/ }),

/***/ "./node_modules/antlr4/InputStream.js":
/*!********************************************!*\
  !*** ./node_modules/antlr4/InputStream.js ***!
  \********************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
//

var Token = __webpack_require__(/*! ./Token */ "./node_modules/antlr4/Token.js").Token;
__webpack_require__(/*! ./polyfills/codepointat */ "./node_modules/antlr4/polyfills/codepointat.js");
__webpack_require__(/*! ./polyfills/fromcodepoint */ "./node_modules/antlr4/polyfills/fromcodepoint.js");

// Vacuum all input from a string and then treat it like a buffer.

function _loadString(stream) {
	stream._index = 0;
	stream.data = [];
	if (stream.decodeToUnicodeCodePoints) {
		for (var i = 0; i < stream.strdata.length; ) {
			var codePoint = stream.strdata.codePointAt(i);
			stream.data.push(codePoint);
			i += codePoint <= 0xFFFF ? 1 : 2;
		}
	} else {
		for (var i = 0; i < stream.strdata.length; i++) {
			var codeUnit = stream.strdata.charCodeAt(i);
			stream.data.push(codeUnit);
		}
	}
	stream._size = stream.data.length;
}

// If decodeToUnicodeCodePoints is true, the input is treated
// as a series of Unicode code points.
//
// Otherwise, the input is treated as a series of 16-bit UTF-16 code
// units.
function InputStream(data, decodeToUnicodeCodePoints) {
	this.name = "<empty>";
	this.strdata = data;
	this.decodeToUnicodeCodePoints = decodeToUnicodeCodePoints || false;
	_loadString(this);
	return this;
}

Object.defineProperty(InputStream.prototype, "index", {
	get : function() {
		return this._index;
	}
});

Object.defineProperty(InputStream.prototype, "size", {
	get : function() {
		return this._size;
	}
});

// Reset the stream so that it's in the same state it was
// when the object was created *except* the data array is not
// touched.
//
InputStream.prototype.reset = function() {
	this._index = 0;
};

InputStream.prototype.consume = function() {
	if (this._index >= this._size) {
		// assert this.LA(1) == Token.EOF
		throw ("cannot consume EOF");
	}
	this._index += 1;
};

InputStream.prototype.LA = function(offset) {
	if (offset === 0) {
		return 0; // undefined
	}
	if (offset < 0) {
		offset += 1; // e.g., translate LA(-1) to use offset=0
	}
	var pos = this._index + offset - 1;
	if (pos < 0 || pos >= this._size) { // invalid
		return Token.EOF;
	}
	return this.data[pos];
};

InputStream.prototype.LT = function(offset) {
	return this.LA(offset);
};

// mark/release do nothing; we have entire buffer
InputStream.prototype.mark = function() {
	return -1;
};

InputStream.prototype.release = function(marker) {
};

// consume() ahead until p==_index; can't just set p=_index as we must
// update line and column. If we seek backwards, just set p
//
InputStream.prototype.seek = function(_index) {
	if (_index <= this._index) {
		this._index = _index; // just jump; don't update stream state (line,
								// ...)
		return;
	}
	// seek forward
	this._index = Math.min(_index, this._size);
};

InputStream.prototype.getText = function(start, stop) {
	if (stop >= this._size) {
		stop = this._size - 1;
	}
	if (start >= this._size) {
		return "";
	} else {
		if (this.decodeToUnicodeCodePoints) {
			var result = "";
			for (var i = start; i <= stop; i++) {
				result += String.fromCodePoint(this.data[i]);
			}
			return result;
		} else {
			return this.strdata.slice(start, stop + 1);
		}
	}
};

InputStream.prototype.toString = function() {
	return this.strdata;
};

exports.InputStream = InputStream;


/***/ }),

/***/ "./node_modules/antlr4/IntervalSet.js":
/*!********************************************!*\
  !*** ./node_modules/antlr4/IntervalSet.js ***!
  \********************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

/*jslint smarttabs:true */

var Token = __webpack_require__(/*! ./Token */ "./node_modules/antlr4/Token.js").Token;

/* stop is not included! */
function Interval(start, stop) {
	this.start = start;
	this.stop = stop;
	return this;
}

Interval.prototype.contains = function(item) {
	return item >= this.start && item < this.stop;
};

Interval.prototype.toString = function() {
	if(this.start===this.stop-1) {
		return this.start.toString();
	} else {
		return this.start.toString() + ".." + (this.stop-1).toString();
	}
};


Object.defineProperty(Interval.prototype, "length", {
	get : function() {
		return this.stop - this.start;
	}
});

function IntervalSet() {
	this.intervals = null;
	this.readOnly = false;
}

IntervalSet.prototype.first = function(v) {
	if (this.intervals === null || this.intervals.length===0) {
		return Token.INVALID_TYPE;
	} else {
		return this.intervals[0].start;
	}
};

IntervalSet.prototype.addOne = function(v) {
	this.addInterval(new Interval(v, v + 1));
};

IntervalSet.prototype.addRange = function(l, h) {
	this.addInterval(new Interval(l, h + 1));
};

IntervalSet.prototype.addInterval = function(v) {
	if (this.intervals === null) {
		this.intervals = [];
		this.intervals.push(v);
	} else {
		// find insert pos
		for (var k = 0; k < this.intervals.length; k++) {
			var i = this.intervals[k];
			// distinct range -> insert
			if (v.stop < i.start) {
				this.intervals.splice(k, 0, v);
				return;
			}
			// contiguous range -> adjust
			else if (v.stop === i.start) {
				this.intervals[k].start = v.start;
				return;
			}
			// overlapping range -> adjust and reduce
			else if (v.start <= i.stop) {
				this.intervals[k] = new Interval(Math.min(i.start, v.start), Math.max(i.stop, v.stop));
				this.reduce(k);
				return;
			}
		}
		// greater than any existing
		this.intervals.push(v);
	}
};

IntervalSet.prototype.addSet = function(other) {
	if (other.intervals !== null) {
		for (var k = 0; k < other.intervals.length; k++) {
			var i = other.intervals[k];
			this.addInterval(new Interval(i.start, i.stop));
		}
	}
	return this;
};

IntervalSet.prototype.reduce = function(k) {
	// only need to reduce if k is not the last
	if (k < this.intervalslength - 1) {
		var l = this.intervals[k];
		var r = this.intervals[k + 1];
		// if r contained in l
		if (l.stop >= r.stop) {
			this.intervals.pop(k + 1);
			this.reduce(k);
		} else if (l.stop >= r.start) {
			this.intervals[k] = new Interval(l.start, r.stop);
			this.intervals.pop(k + 1);
		}
	}
};

IntervalSet.prototype.complement = function(start, stop) {
    var result = new IntervalSet();
    result.addInterval(new Interval(start,stop+1));
    for(var i=0; i<this.intervals.length; i++) {
        result.removeRange(this.intervals[i]);
    }
    return result;
};

IntervalSet.prototype.contains = function(item) {
	if (this.intervals === null) {
		return false;
	} else {
		for (var k = 0; k < this.intervals.length; k++) {
			if(this.intervals[k].contains(item)) {
				return true;
			}
		}
		return false;
	}
};

Object.defineProperty(IntervalSet.prototype, "length", {
	get : function() {
		var len = 0;
		this.intervals.map(function(i) {len += i.length;});
		return len;
	}
});

IntervalSet.prototype.removeRange = function(v) {
    if(v.start===v.stop-1) {
        this.removeOne(v.start);
    } else if (this.intervals!==null) {
        var k = 0;
        for(var n=0; n<this.intervals.length; n++) {
            var i = this.intervals[k];
            // intervals are ordered
            if (v.stop<=i.start) {
                return;
            }
            // check for including range, split it
            else if(v.start>i.start && v.stop<i.stop) {
                this.intervals[k] = new Interval(i.start, v.start);
                var x = new Interval(v.stop, i.stop);
                this.intervals.splice(k, 0, x);
                return;
            }
            // check for included range, remove it
            else if(v.start<=i.start && v.stop>=i.stop) {
                this.intervals.splice(k, 1);
                k = k - 1; // need another pass
            }
            // check for lower boundary
            else if(v.start<i.stop) {
                this.intervals[k] = new Interval(i.start, v.start);
            }
            // check for upper boundary
            else if(v.stop<i.stop) {
                this.intervals[k] = new Interval(v.stop, i.stop);
            }
            k += 1;
        }
    }
};

IntervalSet.prototype.removeOne = function(v) {
	if (this.intervals !== null) {
		for (var k = 0; k < this.intervals.length; k++) {
			var i = this.intervals[k];
			// intervals is ordered
			if (v < i.start) {
				return;
			}
			// check for single value range
			else if (v === i.start && v === i.stop - 1) {
				this.intervals.splice(k, 1);
				return;
			}
			// check for lower boundary
			else if (v === i.start) {
				this.intervals[k] = new Interval(i.start + 1, i.stop);
				return;
			}
			// check for upper boundary
			else if (v === i.stop - 1) {
				this.intervals[k] = new Interval(i.start, i.stop - 1);
				return;
			}
			// split existing range
			else if (v < i.stop - 1) {
				var x = new Interval(i.start, v);
				i.start = v + 1;
				this.intervals.splice(k, 0, x);
				return;
			}
		}
	}
};

IntervalSet.prototype.toString = function(literalNames, symbolicNames, elemsAreChar) {
	literalNames = literalNames || null;
	symbolicNames = symbolicNames || null;
	elemsAreChar = elemsAreChar || false;
	if (this.intervals === null) {
		return "{}";
	} else if(literalNames!==null || symbolicNames!==null) {
		return this.toTokenString(literalNames, symbolicNames);
	} else if(elemsAreChar) {
		return this.toCharString();
	} else {
		return this.toIndexString();
	}
};

IntervalSet.prototype.toCharString = function() {
	var names = [];
	for (var i = 0; i < this.intervals.length; i++) {
		var v = this.intervals[i];
		if(v.stop===v.start+1) {
			if ( v.start===Token.EOF ) {
				names.push("<EOF>");
			} else {
				names.push("'" + String.fromCharCode(v.start) + "'");
			}
		} else {
			names.push("'" + String.fromCharCode(v.start) + "'..'" + String.fromCharCode(v.stop-1) + "'");
		}
	}
	if (names.length > 1) {
		return "{" + names.join(", ") + "}";
	} else {
		return names[0];
	}
};


IntervalSet.prototype.toIndexString = function() {
	var names = [];
	for (var i = 0; i < this.intervals.length; i++) {
		var v = this.intervals[i];
		if(v.stop===v.start+1) {
			if ( v.start===Token.EOF ) {
				names.push("<EOF>");
			} else {
				names.push(v.start.toString());
			}
		} else {
			names.push(v.start.toString() + ".." + (v.stop-1).toString());
		}
	}
	if (names.length > 1) {
		return "{" + names.join(", ") + "}";
	} else {
		return names[0];
	}
};


IntervalSet.prototype.toTokenString = function(literalNames, symbolicNames) {
	var names = [];
	for (var i = 0; i < this.intervals.length; i++) {
		var v = this.intervals[i];
		for (var j = v.start; j < v.stop; j++) {
			names.push(this.elementName(literalNames, symbolicNames, j));
		}
	}
	if (names.length > 1) {
		return "{" + names.join(", ") + "}";
	} else {
		return names[0];
	}
};

IntervalSet.prototype.elementName = function(literalNames, symbolicNames, a) {
	if (a === Token.EOF) {
		return "<EOF>";
	} else if (a === Token.EPSILON) {
		return "<EPSILON>";
	} else {
		return literalNames[a] || symbolicNames[a];
	}
};

exports.Interval = Interval;
exports.IntervalSet = IntervalSet;


/***/ }),

/***/ "./node_modules/antlr4/LL1Analyzer.js":
/*!********************************************!*\
  !*** ./node_modules/antlr4/LL1Analyzer.js ***!
  \********************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
///

var Set = __webpack_require__(/*! ./Utils */ "./node_modules/antlr4/Utils.js").Set;
var BitSet = __webpack_require__(/*! ./Utils */ "./node_modules/antlr4/Utils.js").BitSet;
var Token = __webpack_require__(/*! ./Token */ "./node_modules/antlr4/Token.js").Token;
var ATNConfig = __webpack_require__(/*! ./atn/ATNConfig */ "./node_modules/antlr4/atn/ATNConfig.js").ATNConfig;
var Interval = __webpack_require__(/*! ./IntervalSet */ "./node_modules/antlr4/IntervalSet.js").Interval;
var IntervalSet = __webpack_require__(/*! ./IntervalSet */ "./node_modules/antlr4/IntervalSet.js").IntervalSet;
var RuleStopState = __webpack_require__(/*! ./atn/ATNState */ "./node_modules/antlr4/atn/ATNState.js").RuleStopState;
var RuleTransition = __webpack_require__(/*! ./atn/Transition */ "./node_modules/antlr4/atn/Transition.js").RuleTransition;
var NotSetTransition = __webpack_require__(/*! ./atn/Transition */ "./node_modules/antlr4/atn/Transition.js").NotSetTransition;
var WildcardTransition = __webpack_require__(/*! ./atn/Transition */ "./node_modules/antlr4/atn/Transition.js").WildcardTransition;
var AbstractPredicateTransition = __webpack_require__(/*! ./atn/Transition */ "./node_modules/antlr4/atn/Transition.js").AbstractPredicateTransition;

var pc = __webpack_require__(/*! ./PredictionContext */ "./node_modules/antlr4/PredictionContext.js");
var predictionContextFromRuleContext = pc.predictionContextFromRuleContext;
var PredictionContext = pc.PredictionContext;
var SingletonPredictionContext = pc.SingletonPredictionContext;

function LL1Analyzer (atn) {
    this.atn = atn;
}

//* Special value added to the lookahead sets to indicate that we hit
//  a predicate during analysis if {@code seeThruPreds==false}.
///
LL1Analyzer.HIT_PRED = Token.INVALID_TYPE;


//*
// Calculates the SLL(1) expected lookahead set for each outgoing transition
// of an {@link ATNState}. The returned array has one element for each
// outgoing transition in {@code s}. If the closure from transition
// <em>i</em> leads to a semantic predicate before matching a symbol, the
// element at index <em>i</em> of the result will be {@code null}.
//
// @param s the ATN state
// @return the expected symbols for each outgoing transition of {@code s}.
///
LL1Analyzer.prototype.getDecisionLookahead = function(s) {
    if (s === null) {
        return null;
    }
    var count = s.transitions.length;
    var look = [];
    for(var alt=0; alt< count; alt++) {
        look[alt] = new IntervalSet();
        var lookBusy = new Set();
        var seeThruPreds = false; // fail to get lookahead upon pred
        this._LOOK(s.transition(alt).target, null, PredictionContext.EMPTY,
              look[alt], lookBusy, new BitSet(), seeThruPreds, false);
        // Wipe out lookahead for this alternative if we found nothing
        // or we had a predicate when we !seeThruPreds
        if (look[alt].length===0 || look[alt].contains(LL1Analyzer.HIT_PRED)) {
            look[alt] = null;
        }
    }
    return look;
};

//*
// Compute set of tokens that can follow {@code s} in the ATN in the
// specified {@code ctx}.
//
// <p>If {@code ctx} is {@code null} and the end of the rule containing
// {@code s} is reached, {@link Token//EPSILON} is added to the result set.
// If {@code ctx} is not {@code null} and the end of the outermost rule is
// reached, {@link Token//EOF} is added to the result set.</p>
//
// @param s the ATN state
// @param stopState the ATN state to stop at. This can be a
// {@link BlockEndState} to detect epsilon paths through a closure.
// @param ctx the complete parser context, or {@code null} if the context
// should be ignored
//
// @return The set of tokens that can follow {@code s} in the ATN in the
// specified {@code ctx}.
///
LL1Analyzer.prototype.LOOK = function(s, stopState, ctx) {
    var r = new IntervalSet();
    var seeThruPreds = true; // ignore preds; get all lookahead
	ctx = ctx || null;
    var lookContext = ctx!==null ? predictionContextFromRuleContext(s.atn, ctx) : null;
    this._LOOK(s, stopState, lookContext, r, new Set(), new BitSet(), seeThruPreds, true);
    return r;
};

//*
// Compute set of tokens that can follow {@code s} in the ATN in the
// specified {@code ctx}.
//
// <p>If {@code ctx} is {@code null} and {@code stopState} or the end of the
// rule containing {@code s} is reached, {@link Token//EPSILON} is added to
// the result set. If {@code ctx} is not {@code null} and {@code addEOF} is
// {@code true} and {@code stopState} or the end of the outermost rule is
// reached, {@link Token//EOF} is added to the result set.</p>
//
// @param s the ATN state.
// @param stopState the ATN state to stop at. This can be a
// {@link BlockEndState} to detect epsilon paths through a closure.
// @param ctx The outer context, or {@code null} if the outer context should
// not be used.
// @param look The result lookahead set.
// @param lookBusy A set used for preventing epsilon closures in the ATN
// from causing a stack overflow. Outside code should pass
// {@code new Set<ATNConfig>} for this argument.
// @param calledRuleStack A set used for preventing left recursion in the
// ATN from causing a stack overflow. Outside code should pass
// {@code new BitSet()} for this argument.
// @param seeThruPreds {@code true} to true semantic predicates as
// implicitly {@code true} and "see through them", otherwise {@code false}
// to treat semantic predicates as opaque and add {@link //HIT_PRED} to the
// result if one is encountered.
// @param addEOF Add {@link Token//EOF} to the result if the end of the
// outermost context is reached. This parameter has no effect if {@code ctx}
// is {@code null}.
///
LL1Analyzer.prototype._LOOK = function(s, stopState , ctx, look, lookBusy, calledRuleStack, seeThruPreds, addEOF) {
    var c = new ATNConfig({state:s, alt:0, context: ctx}, null);
    if (lookBusy.contains(c)) {
        return;
    }
    lookBusy.add(c);
    if (s === stopState) {
        if (ctx ===null) {
            look.addOne(Token.EPSILON);
            return;
        } else if (ctx.isEmpty() && addEOF) {
            look.addOne(Token.EOF);
            return;
        }
    }
    if (s instanceof RuleStopState ) {
        if (ctx ===null) {
            look.addOne(Token.EPSILON);
            return;
        } else if (ctx.isEmpty() && addEOF) {
            look.addOne(Token.EOF);
            return;
        }
        if (ctx !== PredictionContext.EMPTY) {
            // run thru all possible stack tops in ctx
            for(var i=0; i<ctx.length; i++) {
                var returnState = this.atn.states[ctx.getReturnState(i)];
                var removed = calledRuleStack.contains(returnState.ruleIndex);
                try {
                    calledRuleStack.remove(returnState.ruleIndex);
                    this._LOOK(returnState, stopState, ctx.getParent(i), look, lookBusy, calledRuleStack, seeThruPreds, addEOF);
                } finally {
                    if (removed) {
                        calledRuleStack.add(returnState.ruleIndex);
                    }
                }
            }
            return;
        }
    }
    for(var j=0; j<s.transitions.length; j++) {
        var t = s.transitions[j];
        if (t.constructor === RuleTransition) {
            if (calledRuleStack.contains(t.target.ruleIndex)) {
                continue;
            }
            var newContext = SingletonPredictionContext.create(ctx, t.followState.stateNumber);
            try {
                calledRuleStack.add(t.target.ruleIndex);
                this._LOOK(t.target, stopState, newContext, look, lookBusy, calledRuleStack, seeThruPreds, addEOF);
            } finally {
                calledRuleStack.remove(t.target.ruleIndex);
            }
        } else if (t instanceof AbstractPredicateTransition ) {
            if (seeThruPreds) {
                this._LOOK(t.target, stopState, ctx, look, lookBusy, calledRuleStack, seeThruPreds, addEOF);
            } else {
                look.addOne(LL1Analyzer.HIT_PRED);
            }
        } else if( t.isEpsilon) {
            this._LOOK(t.target, stopState, ctx, look, lookBusy, calledRuleStack, seeThruPreds, addEOF);
        } else if (t.constructor === WildcardTransition) {
            look.addRange( Token.MIN_USER_TOKEN_TYPE, this.atn.maxTokenType );
        } else {
            var set = t.label;
            if (set !== null) {
                if (t instanceof NotSetTransition) {
                    set = set.complement(Token.MIN_USER_TOKEN_TYPE, this.atn.maxTokenType);
                }
                look.addSet(set);
            }
        }
    }
};

exports.LL1Analyzer = LL1Analyzer;



/***/ }),

/***/ "./node_modules/antlr4/Lexer.js":
/*!**************************************!*\
  !*** ./node_modules/antlr4/Lexer.js ***!
  \**************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
///

// A lexer is recognizer that draws input symbols from a character stream.
//  lexer grammars result in a subclass of this object. A Lexer object
//  uses simplified match() and error recovery mechanisms in the interest of speed.

var Token = __webpack_require__(/*! ./Token */ "./node_modules/antlr4/Token.js").Token;
var Recognizer = __webpack_require__(/*! ./Recognizer */ "./node_modules/antlr4/Recognizer.js").Recognizer;
var CommonTokenFactory = __webpack_require__(/*! ./CommonTokenFactory */ "./node_modules/antlr4/CommonTokenFactory.js").CommonTokenFactory;
var RecognitionException  = __webpack_require__(/*! ./error/Errors */ "./node_modules/antlr4/error/Errors.js").RecognitionException;
var LexerNoViableAltException = __webpack_require__(/*! ./error/Errors */ "./node_modules/antlr4/error/Errors.js").LexerNoViableAltException;

function TokenSource() {
	return this;
}

function Lexer(input) {
	Recognizer.call(this);
	this._input = input;
	this._factory = CommonTokenFactory.DEFAULT;
	this._tokenFactorySourcePair = [ this, input ];

	this._interp = null; // child classes must populate this

	// The goal of all lexer rules/methods is to create a token object.
	// this is an instance variable as multiple rules may collaborate to
	// create a single token. nextToken will return this object after
	// matching lexer rule(s). If you subclass to allow multiple token
	// emissions, then set this to the last token to be matched or
	// something nonnull so that the auto token emit mechanism will not
	// emit another token.
	this._token = null;

	// What character index in the stream did the current token start at?
	// Needed, for example, to get the text for current token. Set at
	// the start of nextToken.
	this._tokenStartCharIndex = -1;

	// The line on which the first character of the token resides///
	this._tokenStartLine = -1;

	// The character position of first character within the line///
	this._tokenStartColumn = -1;

	// Once we see EOF on char stream, next token will be EOF.
	// If you have DONE : EOF ; then you see DONE EOF.
	this._hitEOF = false;

	// The channel number for the current token///
	this._channel = Token.DEFAULT_CHANNEL;

	// The token type for the current token///
	this._type = Token.INVALID_TYPE;

	this._modeStack = [];
	this._mode = Lexer.DEFAULT_MODE;

	// You can set the text for the current token to override what is in
	// the input char buffer. Use setText() or can set this instance var.
	// /
	this._text = null;

	return this;
}

Lexer.prototype = Object.create(Recognizer.prototype);
Lexer.prototype.constructor = Lexer;

Lexer.DEFAULT_MODE = 0;
Lexer.MORE = -2;
Lexer.SKIP = -3;

Lexer.DEFAULT_TOKEN_CHANNEL = Token.DEFAULT_CHANNEL;
Lexer.HIDDEN = Token.HIDDEN_CHANNEL;
Lexer.MIN_CHAR_VALUE = 0x0000;
Lexer.MAX_CHAR_VALUE = 0x10FFFF;

Lexer.prototype.reset = function() {
	// wack Lexer state variables
	if (this._input !== null) {
		this._input.seek(0); // rewind the input
	}
	this._token = null;
	this._type = Token.INVALID_TYPE;
	this._channel = Token.DEFAULT_CHANNEL;
	this._tokenStartCharIndex = -1;
	this._tokenStartColumn = -1;
	this._tokenStartLine = -1;
	this._text = null;

	this._hitEOF = false;
	this._mode = Lexer.DEFAULT_MODE;
	this._modeStack = [];

	this._interp.reset();
};

// Return a token from this source; i.e., match a token on the char stream.
Lexer.prototype.nextToken = function() {
	if (this._input === null) {
		throw "nextToken requires a non-null input stream.";
	}

	// Mark start location in char stream so unbuffered streams are
	// guaranteed at least have text of current token
	var tokenStartMarker = this._input.mark();
	try {
		while (true) {
			if (this._hitEOF) {
				this.emitEOF();
				return this._token;
			}
			this._token = null;
			this._channel = Token.DEFAULT_CHANNEL;
			this._tokenStartCharIndex = this._input.index;
			this._tokenStartColumn = this._interp.column;
			this._tokenStartLine = this._interp.line;
			this._text = null;
			var continueOuter = false;
			while (true) {
				this._type = Token.INVALID_TYPE;
				var ttype = Lexer.SKIP;
				try {
					ttype = this._interp.match(this._input, this._mode);
				} catch (e) {
				    if(e instanceof RecognitionException) {
                        this.notifyListeners(e); // report error
                        this.recover(e);
                    } else {
                        console.log(e.stack);
                        throw e;
                    }
				}
				if (this._input.LA(1) === Token.EOF) {
					this._hitEOF = true;
				}
				if (this._type === Token.INVALID_TYPE) {
					this._type = ttype;
				}
				if (this._type === Lexer.SKIP) {
					continueOuter = true;
					break;
				}
				if (this._type !== Lexer.MORE) {
					break;
				}
			}
			if (continueOuter) {
				continue;
			}
			if (this._token === null) {
				this.emit();
			}
			return this._token;
		}
	} finally {
		// make sure we release marker after match or
		// unbuffered char stream will keep buffering
		this._input.release(tokenStartMarker);
	}
};

// Instruct the lexer to skip creating a token for current lexer rule
// and look for another token. nextToken() knows to keep looking when
// a lexer rule finishes with token set to SKIP_TOKEN. Recall that
// if token==null at end of any token rule, it creates one for you
// and emits it.
// /
Lexer.prototype.skip = function() {
	this._type = Lexer.SKIP;
};

Lexer.prototype.more = function() {
	this._type = Lexer.MORE;
};

Lexer.prototype.mode = function(m) {
	this._mode = m;
};

Lexer.prototype.pushMode = function(m) {
	if (this._interp.debug) {
		console.log("pushMode " + m);
	}
	this._modeStack.push(this._mode);
	this.mode(m);
};

Lexer.prototype.popMode = function() {
	if (this._modeStack.length === 0) {
		throw "Empty Stack";
	}
	if (this._interp.debug) {
		console.log("popMode back to " + this._modeStack.slice(0, -1));
	}
	this.mode(this._modeStack.pop());
	return this._mode;
};

// Set the char stream and reset the lexer
Object.defineProperty(Lexer.prototype, "inputStream", {
	get : function() {
		return this._input;
	},
	set : function(input) {
		this._input = null;
		this._tokenFactorySourcePair = [ this, this._input ];
		this.reset();
		this._input = input;
		this._tokenFactorySourcePair = [ this, this._input ];
	}
});

Object.defineProperty(Lexer.prototype, "sourceName", {
	get : function sourceName() {
		return this._input.sourceName;
	}
});

// By default does not support multiple emits per nextToken invocation
// for efficiency reasons. Subclass and override this method, nextToken,
// and getToken (to push tokens into a list and pull from that list
// rather than a single variable as this implementation does).
// /
Lexer.prototype.emitToken = function(token) {
	this._token = token;
};

// The standard method called to automatically emit a token at the
// outermost lexical rule. The token object should point into the
// char buffer start..stop. If there is a text override in 'text',
// use that to set the token's text. Override this method to emit
// custom Token objects or provide a new factory.
// /
Lexer.prototype.emit = function() {
	var t = this._factory.create(this._tokenFactorySourcePair, this._type,
			this._text, this._channel, this._tokenStartCharIndex, this
					.getCharIndex() - 1, this._tokenStartLine,
			this._tokenStartColumn);
	this.emitToken(t);
	return t;
};

Lexer.prototype.emitEOF = function() {
	var cpos = this.column;
	var lpos = this.line;
	var eof = this._factory.create(this._tokenFactorySourcePair, Token.EOF,
			null, Token.DEFAULT_CHANNEL, this._input.index,
			this._input.index - 1, lpos, cpos);
	this.emitToken(eof);
	return eof;
};

Object.defineProperty(Lexer.prototype, "type", {
	get : function() {
		return this.type;
	},
	set : function(type) {
		this._type = type;
	}
});

Object.defineProperty(Lexer.prototype, "line", {
	get : function() {
		return this._interp.line;
	},
	set : function(line) {
		this._interp.line = line;
	}
});

Object.defineProperty(Lexer.prototype, "column", {
	get : function() {
		return this._interp.column;
	},
	set : function(column) {
		this._interp.column = column;
	}
});


// What is the index of the current character of lookahead?///
Lexer.prototype.getCharIndex = function() {
	return this._input.index;
};

// Return the text matched so far for the current token or any text override.
//Set the complete text of this token; it wipes any previous changes to the text.
Object.defineProperty(Lexer.prototype, "text", {
	get : function() {
		if (this._text !== null) {
			return this._text;
		} else {
			return this._interp.getText(this._input);
		}
	},
	set : function(text) {
		this._text = text;
	}
});
// Return a list of all Token objects in input char stream.
// Forces load of all tokens. Does not include EOF token.
// /
Lexer.prototype.getAllTokens = function() {
	var tokens = [];
	var t = this.nextToken();
	while (t.type !== Token.EOF) {
		tokens.push(t);
		t = this.nextToken();
	}
	return tokens;
};

Lexer.prototype.notifyListeners = function(e) {
	var start = this._tokenStartCharIndex;
	var stop = this._input.index;
	var text = this._input.getText(start, stop);
	var msg = "token recognition error at: '" + this.getErrorDisplay(text) + "'";
	var listener = this.getErrorListenerDispatch();
	listener.syntaxError(this, null, this._tokenStartLine,
			this._tokenStartColumn, msg, e);
};

Lexer.prototype.getErrorDisplay = function(s) {
	var d = [];
	for (var i = 0; i < s.length; i++) {
		d.push(s[i]);
	}
	return d.join('');
};

Lexer.prototype.getErrorDisplayForChar = function(c) {
	if (c.charCodeAt(0) === Token.EOF) {
		return "<EOF>";
	} else if (c === '\n') {
		return "\\n";
	} else if (c === '\t') {
		return "\\t";
	} else if (c === '\r') {
		return "\\r";
	} else {
		return c;
	}
};

Lexer.prototype.getCharErrorDisplay = function(c) {
	return "'" + this.getErrorDisplayForChar(c) + "'";
};

// Lexers can normally match any char in it's vocabulary after matching
// a token, so do the easy thing and just kill a character and hope
// it all works out. You can instead use the rule invocation stack
// to do sophisticated error recovery if you are in a fragment rule.
// /
Lexer.prototype.recover = function(re) {
	if (this._input.LA(1) !== Token.EOF) {
		if (re instanceof LexerNoViableAltException) {
			// skip a char and try again
			this._interp.consume(this._input);
		} else {
			// TODO: Do we lose character or line position information?
			this._input.consume();
		}
	}
};

exports.Lexer = Lexer;


/***/ }),

/***/ "./node_modules/antlr4/Parser.js":
/*!***************************************!*\
  !*** ./node_modules/antlr4/Parser.js ***!
  \***************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

var Token = __webpack_require__(/*! ./Token */ "./node_modules/antlr4/Token.js").Token;
var ParseTreeListener = __webpack_require__(/*! ./tree/Tree */ "./node_modules/antlr4/tree/Tree.js").ParseTreeListener;
var Recognizer = __webpack_require__(/*! ./Recognizer */ "./node_modules/antlr4/Recognizer.js").Recognizer;
var DefaultErrorStrategy = __webpack_require__(/*! ./error/ErrorStrategy */ "./node_modules/antlr4/error/ErrorStrategy.js").DefaultErrorStrategy;
var ATNDeserializer = __webpack_require__(/*! ./atn/ATNDeserializer */ "./node_modules/antlr4/atn/ATNDeserializer.js").ATNDeserializer;
var ATNDeserializationOptions = __webpack_require__(/*! ./atn/ATNDeserializationOptions */ "./node_modules/antlr4/atn/ATNDeserializationOptions.js").ATNDeserializationOptions;
var TerminalNode = __webpack_require__(/*! ./tree/Tree */ "./node_modules/antlr4/tree/Tree.js").TerminalNode;
var ErrorNode = __webpack_require__(/*! ./tree/Tree */ "./node_modules/antlr4/tree/Tree.js").ErrorNode;

function TraceListener(parser) {
	ParseTreeListener.call(this);
    this.parser = parser;
	return this;
}

TraceListener.prototype = Object.create(ParseTreeListener.prototype);
TraceListener.prototype.constructor = TraceListener;

TraceListener.prototype.enterEveryRule = function(ctx) {
	console.log("enter   " + this.parser.ruleNames[ctx.ruleIndex] + ", LT(1)=" + this.parser._input.LT(1).text);
};

TraceListener.prototype.visitTerminal = function( node) {
	console.log("consume " + node.symbol + " rule " + this.parser.ruleNames[this.parser._ctx.ruleIndex]);
};

TraceListener.prototype.exitEveryRule = function(ctx) {
	console.log("exit    " + this.parser.ruleNames[ctx.ruleIndex] + ", LT(1)=" + this.parser._input.LT(1).text);
};

// this is all the parsing support code essentially; most of it is error
// recovery stuff.//
function Parser(input) {
	Recognizer.call(this);
	// The input stream.
	this._input = null;
	// The error handling strategy for the parser. The default value is a new
	// instance of {@link DefaultErrorStrategy}.
	this._errHandler = new DefaultErrorStrategy();
	this._precedenceStack = [];
	this._precedenceStack.push(0);
	// The {@link ParserRuleContext} object for the currently executing rule.
	// this is always non-null during the parsing process.
	this._ctx = null;
	// Specifies whether or not the parser should construct a parse tree during
	// the parsing process. The default value is {@code true}.
	this.buildParseTrees = true;
	// When {@link //setTrace}{@code (true)} is called, a reference to the
	// {@link TraceListener} is stored here so it can be easily removed in a
	// later call to {@link //setTrace}{@code (false)}. The listener itself is
	// implemented as a parser listener so this field is not directly used by
	// other parser methods.
	this._tracer = null;
	// The list of {@link ParseTreeListener} listeners registered to receive
	// events during the parse.
	this._parseListeners = null;
	// The number of syntax errors reported during parsing. this value is
	// incremented each time {@link //notifyErrorListeners} is called.
	this._syntaxErrors = 0;
	this.setInputStream(input);
	return this;
}

Parser.prototype = Object.create(Recognizer.prototype);
Parser.prototype.contructor = Parser;

// this field maps from the serialized ATN string to the deserialized {@link
// ATN} with
// bypass alternatives.
//
// @see ATNDeserializationOptions//isGenerateRuleBypassTransitions()
//
Parser.bypassAltsAtnCache = {};

// reset the parser's state//
Parser.prototype.reset = function() {
	if (this._input !== null) {
		this._input.seek(0);
	}
	this._errHandler.reset(this);
	this._ctx = null;
	this._syntaxErrors = 0;
	this.setTrace(false);
	this._precedenceStack = [];
	this._precedenceStack.push(0);
	if (this._interp !== null) {
		this._interp.reset();
	}
};

// Match current input symbol against {@code ttype}. If the symbol type
// matches, {@link ANTLRErrorStrategy//reportMatch} and {@link //consume} are
// called to complete the match process.
//
// <p>If the symbol type does not match,
// {@link ANTLRErrorStrategy//recoverInline} is called on the current error
// strategy to attempt recovery. If {@link //getBuildParseTree} is
// {@code true} and the token index of the symbol returned by
// {@link ANTLRErrorStrategy//recoverInline} is -1, the symbol is added to
// the parse tree by calling {@link ParserRuleContext//addErrorNode}.</p>
//
// @param ttype the token type to match
// @return the matched symbol
// @throws RecognitionException if the current input symbol did not match
// {@code ttype} and the error strategy could not recover from the
// mismatched symbol

Parser.prototype.match = function(ttype) {
	var t = this.getCurrentToken();
	if (t.type === ttype) {
		this._errHandler.reportMatch(this);
		this.consume();
	} else {
		t = this._errHandler.recoverInline(this);
		if (this.buildParseTrees && t.tokenIndex === -1) {
			// we must have conjured up a new token during single token
			// insertion
			// if it's not the current symbol
			this._ctx.addErrorNode(t);
		}
	}
	return t;
};
// Match current input symbol as a wildcard. If the symbol type matches
// (i.e. has a value greater than 0), {@link ANTLRErrorStrategy//reportMatch}
// and {@link //consume} are called to complete the match process.
//
// <p>If the symbol type does not match,
// {@link ANTLRErrorStrategy//recoverInline} is called on the current error
// strategy to attempt recovery. If {@link //getBuildParseTree} is
// {@code true} and the token index of the symbol returned by
// {@link ANTLRErrorStrategy//recoverInline} is -1, the symbol is added to
// the parse tree by calling {@link ParserRuleContext//addErrorNode}.</p>
//
// @return the matched symbol
// @throws RecognitionException if the current input symbol did not match
// a wildcard and the error strategy could not recover from the mismatched
// symbol

Parser.prototype.matchWildcard = function() {
	var t = this.getCurrentToken();
	if (t.type > 0) {
		this._errHandler.reportMatch(this);
		this.consume();
	} else {
		t = this._errHandler.recoverInline(this);
		if (this._buildParseTrees && t.tokenIndex === -1) {
			// we must have conjured up a new token during single token
			// insertion
			// if it's not the current symbol
			this._ctx.addErrorNode(t);
		}
	}
	return t;
};

Parser.prototype.getParseListeners = function() {
	return this._parseListeners || [];
};

// Registers {@code listener} to receive events during the parsing process.
//
// <p>To support output-preserving grammar transformations (including but not
// limited to left-recursion removal, automated left-factoring, and
// optimized code generation), calls to listener methods during the parse
// may differ substantially from calls made by
// {@link ParseTreeWalker//DEFAULT} used after the parse is complete. In
// particular, rule entry and exit events may occur in a different order
// during the parse than after the parser. In addition, calls to certain
// rule entry methods may be omitted.</p>
//
// <p>With the following specific exceptions, calls to listener events are
// <em>deterministic</em>, i.e. for identical input the calls to listener
// methods will be the same.</p>
//
// <ul>
// <li>Alterations to the grammar used to generate code may change the
// behavior of the listener calls.</li>
// <li>Alterations to the command line options passed to ANTLR 4 when
// generating the parser may change the behavior of the listener calls.</li>
// <li>Changing the version of the ANTLR Tool used to generate the parser
// may change the behavior of the listener calls.</li>
// </ul>
//
// @param listener the listener to add
//
// @throws NullPointerException if {@code} listener is {@code null}
//
Parser.prototype.addParseListener = function(listener) {
	if (listener === null) {
		throw "listener";
	}
	if (this._parseListeners === null) {
		this._parseListeners = [];
	}
	this._parseListeners.push(listener);
};

//
// Remove {@code listener} from the list of parse listeners.
//
// <p>If {@code listener} is {@code null} or has not been added as a parse
// listener, this method does nothing.</p>
// @param listener the listener to remove
//
Parser.prototype.removeParseListener = function(listener) {
	if (this._parseListeners !== null) {
		var idx = this._parseListeners.indexOf(listener);
		if (idx >= 0) {
			this._parseListeners.splice(idx, 1);
		}
		if (this._parseListeners.length === 0) {
			this._parseListeners = null;
		}
	}
};

// Remove all parse listeners.
Parser.prototype.removeParseListeners = function() {
	this._parseListeners = null;
};

// Notify any parse listeners of an enter rule event.
Parser.prototype.triggerEnterRuleEvent = function() {
	if (this._parseListeners !== null) {
        var ctx = this._ctx;
		this._parseListeners.map(function(listener) {
			listener.enterEveryRule(ctx);
			ctx.enterRule(listener);
		});
	}
};

//
// Notify any parse listeners of an exit rule event.
//
// @see //addParseListener
//
Parser.prototype.triggerExitRuleEvent = function() {
	if (this._parseListeners !== null) {
		// reverse order walk of listeners
        var ctx = this._ctx;
		this._parseListeners.slice(0).reverse().map(function(listener) {
			ctx.exitRule(listener);
			listener.exitEveryRule(ctx);
		});
	}
};

Parser.prototype.getTokenFactory = function() {
	return this._input.tokenSource._factory;
};

// Tell our token source and error strategy about a new way to create tokens.//
Parser.prototype.setTokenFactory = function(factory) {
	this._input.tokenSource._factory = factory;
};

// The ATN with bypass alternatives is expensive to create so we create it
// lazily.
//
// @throws UnsupportedOperationException if the current parser does not
// implement the {@link //getSerializedATN()} method.
//
Parser.prototype.getATNWithBypassAlts = function() {
	var serializedAtn = this.getSerializedATN();
	if (serializedAtn === null) {
		throw "The current parser does not support an ATN with bypass alternatives.";
	}
	var result = this.bypassAltsAtnCache[serializedAtn];
	if (result === null) {
		var deserializationOptions = new ATNDeserializationOptions();
		deserializationOptions.generateRuleBypassTransitions = true;
		result = new ATNDeserializer(deserializationOptions)
				.deserialize(serializedAtn);
		this.bypassAltsAtnCache[serializedAtn] = result;
	}
	return result;
};

// The preferred method of getting a tree pattern. For example, here's a
// sample use:
//
// <pre>
// ParseTree t = parser.expr();
// ParseTreePattern p = parser.compileParseTreePattern("&lt;ID&gt;+0",
// MyParser.RULE_expr);
// ParseTreeMatch m = p.match(t);
// String id = m.get("ID");
// </pre>

var Lexer = __webpack_require__(/*! ./Lexer */ "./node_modules/antlr4/Lexer.js").Lexer;

Parser.prototype.compileParseTreePattern = function(pattern, patternRuleIndex, lexer) {
	lexer = lexer || null;
	if (lexer === null) {
		if (this.getTokenStream() !== null) {
			var tokenSource = this.getTokenStream().tokenSource;
			if (tokenSource instanceof Lexer) {
				lexer = tokenSource;
			}
		}
	}
	if (lexer === null) {
		throw "Parser can't discover a lexer to use";
	}
	var m = new ParseTreePatternMatcher(lexer, this);
	return m.compile(pattern, patternRuleIndex);
};

Parser.prototype.getInputStream = function() {
	return this.getTokenStream();
};

Parser.prototype.setInputStream = function(input) {
	this.setTokenStream(input);
};

Parser.prototype.getTokenStream = function() {
	return this._input;
};

// Set the token stream and reset the parser.//
Parser.prototype.setTokenStream = function(input) {
	this._input = null;
	this.reset();
	this._input = input;
};

// Match needs to return the current input symbol, which gets put
// into the label for the associated token ref; e.g., x=ID.
//
Parser.prototype.getCurrentToken = function() {
	return this._input.LT(1);
};

Parser.prototype.notifyErrorListeners = function(msg, offendingToken, err) {
	offendingToken = offendingToken || null;
	err = err || null;
	if (offendingToken === null) {
		offendingToken = this.getCurrentToken();
	}
	this._syntaxErrors += 1;
	var line = offendingToken.line;
	var column = offendingToken.column;
	var listener = this.getErrorListenerDispatch();
	listener.syntaxError(this, offendingToken, line, column, msg, err);
};

//
// Consume and return the {@linkplain //getCurrentToken current symbol}.
//
// <p>E.g., given the following input with {@code A} being the current
// lookahead symbol, this function moves the cursor to {@code B} and returns
// {@code A}.</p>
//
// <pre>
// A B
// ^
// </pre>
//
// If the parser is not in error recovery mode, the consumed symbol is added
// to the parse tree using {@link ParserRuleContext//addChild(Token)}, and
// {@link ParseTreeListener//visitTerminal} is called on any parse listeners.
// If the parser <em>is</em> in error recovery mode, the consumed symbol is
// added to the parse tree using
// {@link ParserRuleContext//addErrorNode(Token)}, and
// {@link ParseTreeListener//visitErrorNode} is called on any parse
// listeners.
//
Parser.prototype.consume = function() {
	var o = this.getCurrentToken();
	if (o.type !== Token.EOF) {
		this.getInputStream().consume();
	}
	var hasListener = this._parseListeners !== null && this._parseListeners.length > 0;
	if (this.buildParseTrees || hasListener) {
		var node;
		if (this._errHandler.inErrorRecoveryMode(this)) {
			node = this._ctx.addErrorNode(o);
		} else {
			node = this._ctx.addTokenNode(o);
		}
        node.invokingState = this.state;
		if (hasListener) {
			this._parseListeners.map(function(listener) {
				if (node instanceof ErrorNode || (node.isErrorNode !== undefined && node.isErrorNode())) {
					listener.visitErrorNode(node);
				} else if (node instanceof TerminalNode) {
					listener.visitTerminal(node);
				}
			});
		}
	}
	return o;
};

Parser.prototype.addContextToParseTree = function() {
	// add current context to parent if we have a parent
	if (this._ctx.parentCtx !== null) {
		this._ctx.parentCtx.addChild(this._ctx);
	}
};

// Always called by generated parsers upon entry to a rule. Access field
// {@link //_ctx} get the current context.

Parser.prototype.enterRule = function(localctx, state, ruleIndex) {
	this.state = state;
	this._ctx = localctx;
	this._ctx.start = this._input.LT(1);
	if (this.buildParseTrees) {
		this.addContextToParseTree();
	}
	if (this._parseListeners !== null) {
		this.triggerEnterRuleEvent();
	}
};

Parser.prototype.exitRule = function() {
	this._ctx.stop = this._input.LT(-1);
	// trigger event on _ctx, before it reverts to parent
	if (this._parseListeners !== null) {
		this.triggerExitRuleEvent();
	}
	this.state = this._ctx.invokingState;
	this._ctx = this._ctx.parentCtx;
};

Parser.prototype.enterOuterAlt = function(localctx, altNum) {
   	localctx.setAltNumber(altNum);
	// if we have new localctx, make sure we replace existing ctx
	// that is previous child of parse tree
	if (this.buildParseTrees && this._ctx !== localctx) {
		if (this._ctx.parentCtx !== null) {
			this._ctx.parentCtx.removeLastChild();
			this._ctx.parentCtx.addChild(localctx);
		}
	}
	this._ctx = localctx;
};

// Get the precedence level for the top-most precedence rule.
//
// @return The precedence level for the top-most precedence rule, or -1 if
// the parser context is not nested within a precedence rule.

Parser.prototype.getPrecedence = function() {
	if (this._precedenceStack.length === 0) {
		return -1;
	} else {
		return this._precedenceStack[this._precedenceStack.length-1];
	}
};

Parser.prototype.enterRecursionRule = function(localctx, state, ruleIndex,
		precedence) {
	this.state = state;
	this._precedenceStack.push(precedence);
	this._ctx = localctx;
	this._ctx.start = this._input.LT(1);
	if (this._parseListeners !== null) {
		this.triggerEnterRuleEvent(); // simulates rule entry for
										// left-recursive rules
	}
};

//
// Like {@link //enterRule} but for recursive rules.

Parser.prototype.pushNewRecursionContext = function(localctx, state, ruleIndex) {
	var previous = this._ctx;
	previous.parentCtx = localctx;
	previous.invokingState = state;
	previous.stop = this._input.LT(-1);

	this._ctx = localctx;
	this._ctx.start = previous.start;
	if (this.buildParseTrees) {
		this._ctx.addChild(previous);
	}
	if (this._parseListeners !== null) {
		this.triggerEnterRuleEvent(); // simulates rule entry for
										// left-recursive rules
	}
};

Parser.prototype.unrollRecursionContexts = function(parentCtx) {
	this._precedenceStack.pop();
	this._ctx.stop = this._input.LT(-1);
	var retCtx = this._ctx; // save current ctx (return value)
	// unroll so _ctx is as it was before call to recursive method
	if (this._parseListeners !== null) {
		while (this._ctx !== parentCtx) {
			this.triggerExitRuleEvent();
			this._ctx = this._ctx.parentCtx;
		}
	} else {
		this._ctx = parentCtx;
	}
	// hook into tree
	retCtx.parentCtx = parentCtx;
	if (this.buildParseTrees && parentCtx !== null) {
		// add return ctx into invoking rule's tree
		parentCtx.addChild(retCtx);
	}
};

Parser.prototype.getInvokingContext = function(ruleIndex) {
	var ctx = this._ctx;
	while (ctx !== null) {
		if (ctx.ruleIndex === ruleIndex) {
			return ctx;
		}
		ctx = ctx.parentCtx;
	}
	return null;
};

Parser.prototype.precpred = function(localctx, precedence) {
	return precedence >= this._precedenceStack[this._precedenceStack.length-1];
};

Parser.prototype.inContext = function(context) {
	// TODO: useful in parser?
	return false;
};

//
// Checks whether or not {@code symbol} can follow the current state in the
// ATN. The behavior of this method is equivalent to the following, but is
// implemented such that the complete context-sensitive follow set does not
// need to be explicitly constructed.
//
// <pre>
// return getExpectedTokens().contains(symbol);
// </pre>
//
// @param symbol the symbol type to check
// @return {@code true} if {@code symbol} can follow the current state in
// the ATN, otherwise {@code false}.

Parser.prototype.isExpectedToken = function(symbol) {
	var atn = this._interp.atn;
	var ctx = this._ctx;
	var s = atn.states[this.state];
	var following = atn.nextTokens(s);
	if (following.contains(symbol)) {
		return true;
	}
	if (!following.contains(Token.EPSILON)) {
		return false;
	}
	while (ctx !== null && ctx.invokingState >= 0 && following.contains(Token.EPSILON)) {
		var invokingState = atn.states[ctx.invokingState];
		var rt = invokingState.transitions[0];
		following = atn.nextTokens(rt.followState);
		if (following.contains(symbol)) {
			return true;
		}
		ctx = ctx.parentCtx;
	}
	if (following.contains(Token.EPSILON) && symbol === Token.EOF) {
		return true;
	} else {
		return false;
	}
};

// Computes the set of input symbols which could follow the current parser
// state and context, as given by {@link //getState} and {@link //getContext},
// respectively.
//
// @see ATN//getExpectedTokens(int, RuleContext)
//
Parser.prototype.getExpectedTokens = function() {
	return this._interp.atn.getExpectedTokens(this.state, this._ctx);
};

Parser.prototype.getExpectedTokensWithinCurrentRule = function() {
	var atn = this._interp.atn;
	var s = atn.states[this.state];
	return atn.nextTokens(s);
};

// Get a rule's index (i.e., {@code RULE_ruleName} field) or -1 if not found.//
Parser.prototype.getRuleIndex = function(ruleName) {
	var ruleIndex = this.getRuleIndexMap()[ruleName];
	if (ruleIndex !== null) {
		return ruleIndex;
	} else {
		return -1;
	}
};

// Return List&lt;String&gt; of the rule names in your parser instance
// leading up to a call to the current rule. You could override if
// you want more details such as the file/line info of where
// in the ATN a rule is invoked.
//
// this is very useful for error messages.
//
Parser.prototype.getRuleInvocationStack = function(p) {
	p = p || null;
	if (p === null) {
		p = this._ctx;
	}
	var stack = [];
	while (p !== null) {
		// compute what follows who invoked us
		var ruleIndex = p.ruleIndex;
		if (ruleIndex < 0) {
			stack.push("n/a");
		} else {
			stack.push(this.ruleNames[ruleIndex]);
		}
		p = p.parentCtx;
	}
	return stack;
};

// For debugging and other purposes.//
Parser.prototype.getDFAStrings = function() {
	return this._interp.decisionToDFA.toString();
};
// For debugging and other purposes.//
Parser.prototype.dumpDFA = function() {
	var seenOne = false;
	for (var i = 0; i < this._interp.decisionToDFA.length; i++) {
		var dfa = this._interp.decisionToDFA[i];
		if (dfa.states.length > 0) {
			if (seenOne) {
				console.log();
			}
			this.printer.println("Decision " + dfa.decision + ":");
			this.printer.print(dfa.toString(this.literalNames, this.symbolicNames));
			seenOne = true;
		}
	}
};

/*
"			printer = function() {\r\n" +
"				this.println = function(s) { document.getElementById('output') += s + '\\n'; }\r\n" +
"				this.print = function(s) { document.getElementById('output') += s; }\r\n" +
"			};\r\n" +
*/

Parser.prototype.getSourceName = function() {
	return this._input.sourceName;
};

// During a parse is sometimes useful to listen in on the rule entry and exit
// events as well as token matches. this is for quick and dirty debugging.
//
Parser.prototype.setTrace = function(trace) {
	if (!trace) {
		this.removeParseListener(this._tracer);
		this._tracer = null;
	} else {
		if (this._tracer !== null) {
			this.removeParseListener(this._tracer);
		}
		this._tracer = new TraceListener(this);
		this.addParseListener(this._tracer);
	}
};

exports.Parser = Parser;

/***/ }),

/***/ "./node_modules/antlr4/ParserRuleContext.js":
/*!**************************************************!*\
  !*** ./node_modules/antlr4/ParserRuleContext.js ***!
  \**************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

//* A rule invocation record for parsing.
//
//  Contains all of the information about the current rule not stored in the
//  RuleContext. It handles parse tree children list, Any ATN state
//  tracing, and the default values available for rule indications:
//  start, stop, rule index, current alt number, current
//  ATN state.
//
//  Subclasses made for each rule and grammar track the parameters,
//  return values, locals, and labels specific to that rule. These
//  are the objects that are returned from rules.
//
//  Note text is not an actual field of a rule return value; it is computed
//  from start and stop using the input stream's toString() method.  I
//  could add a ctor to this so that we can pass in and store the input
//  stream, but I'm not sure we want to do that.  It would seem to be undefined
//  to get the .text property anyway if the rule matches tokens from multiple
//  input streams.
//
//  I do not use getters for fields of objects that are used simply to
//  group values such as this aggregate.  The getters/setters are there to
//  satisfy the superclass interface.

var RuleContext = __webpack_require__(/*! ./RuleContext */ "./node_modules/antlr4/RuleContext.js").RuleContext;
var Tree = __webpack_require__(/*! ./tree/Tree */ "./node_modules/antlr4/tree/Tree.js");
var INVALID_INTERVAL = Tree.INVALID_INTERVAL;
var TerminalNode = Tree.TerminalNode;
var TerminalNodeImpl = Tree.TerminalNodeImpl;
var ErrorNodeImpl = Tree.ErrorNodeImpl;
var Interval = __webpack_require__(/*! ./IntervalSet */ "./node_modules/antlr4/IntervalSet.js").Interval;

function ParserRuleContext(parent, invokingStateNumber) {
	parent = parent || null;
	invokingStateNumber = invokingStateNumber || null;
	RuleContext.call(this, parent, invokingStateNumber);
	this.ruleIndex = -1;
    // * If we are debugging or building a parse tree for a visitor,
    // we need to track all of the tokens and rule invocations associated
    // with this rule's context. This is empty for parsing w/o tree constr.
    // operation because we don't the need to track the details about
    // how we parse this rule.
    // /
    this.children = null;
    this.start = null;
    this.stop = null;
    // The exception that forced this rule to return. If the rule successfully
    // completed, this is {@code null}.
    this.exception = null;
}

ParserRuleContext.prototype = Object.create(RuleContext.prototype);
ParserRuleContext.prototype.constructor = ParserRuleContext;

// * COPY a ctx (I'm deliberately not using copy constructor)///
ParserRuleContext.prototype.copyFrom = function(ctx) {
    // from RuleContext
    this.parentCtx = ctx.parentCtx;
    this.invokingState = ctx.invokingState;
    this.children = null;
    this.start = ctx.start;
    this.stop = ctx.stop;
    // copy any error nodes to alt label node
    if(ctx.children) {
        this.children = [];
        // reset parent pointer for any error nodes
    	ctx.children.map(function(child) {
    		if (child instanceof ErrorNodeImpl) {
                this.children.push(child);
                child.parentCtx = this;
            }
		}, this);
	}
};

// Double dispatch methods for listeners
ParserRuleContext.prototype.enterRule = function(listener) {
};

ParserRuleContext.prototype.exitRule = function(listener) {
};

// * Does not set parent link; other add methods do that///
ParserRuleContext.prototype.addChild = function(child) {
    if (this.children === null) {
        this.children = [];
    }
    this.children.push(child);
    return child;
};

// * Used by enterOuterAlt to toss out a RuleContext previously added as
// we entered a rule. If we have // label, we will need to remove
// generic ruleContext object.
// /
ParserRuleContext.prototype.removeLastChild = function() {
    if (this.children !== null) {
        this.children.pop();
    }
};

ParserRuleContext.prototype.addTokenNode = function(token) {
    var node = new TerminalNodeImpl(token);
    this.addChild(node);
    node.parentCtx = this;
    return node;
};

ParserRuleContext.prototype.addErrorNode = function(badToken) {
    var node = new ErrorNodeImpl(badToken);
    this.addChild(node);
    node.parentCtx = this;
    return node;
};

ParserRuleContext.prototype.getChild = function(i, type) {
	type = type || null;
	if (this.children === null || i < 0 || i >= this.children.length) {
		return null;
	}
	if (type === null) {
		return this.children[i];
	} else {
		for(var j=0; j<this.children.length; j++) {
			var child = this.children[j];
			if(child instanceof type) {
				if(i===0) {
					return child;
				} else {
					i -= 1;
				}
			}
		}
		return null;
    }
};


ParserRuleContext.prototype.getToken = function(ttype, i) {
	if (this.children === null || i < 0 || i >= this.children.length) {
		return null;
	}
	for(var j=0; j<this.children.length; j++) {
		var child = this.children[j];
		if (child instanceof TerminalNode) {
			if (child.symbol.type === ttype) {
				if(i===0) {
					return child;
				} else {
					i -= 1;
				}
			}
        }
	}
    return null;
};

ParserRuleContext.prototype.getTokens = function(ttype ) {
    if (this.children=== null) {
        return [];
    } else {
		var tokens = [];
		for(var j=0; j<this.children.length; j++) {
			var child = this.children[j];
			if (child instanceof TerminalNode) {
				if (child.symbol.type === ttype) {
					tokens.push(child);
				}
			}
		}
		return tokens;
    }
};

ParserRuleContext.prototype.getTypedRuleContext = function(ctxType, i) {
    return this.getChild(i, ctxType);
};

ParserRuleContext.prototype.getTypedRuleContexts = function(ctxType) {
    if (this.children=== null) {
        return [];
    } else {
		var contexts = [];
		for(var j=0; j<this.children.length; j++) {
			var child = this.children[j];
			if (child instanceof ctxType) {
				contexts.push(child);
			}
		}
		return contexts;
	}
};

ParserRuleContext.prototype.getChildCount = function() {
	if (this.children=== null) {
		return 0;
	} else {
		return this.children.length;
	}
};

ParserRuleContext.prototype.getSourceInterval = function() {
    if( this.start === null || this.stop === null) {
        return INVALID_INTERVAL;
    } else {
        return new Interval(this.start.tokenIndex, this.stop.tokenIndex);
    }
};

RuleContext.EMPTY = new ParserRuleContext();

function InterpreterRuleContext(parent, invokingStateNumber, ruleIndex) {
	ParserRuleContext.call(parent, invokingStateNumber);
    this.ruleIndex = ruleIndex;
    return this;
}

InterpreterRuleContext.prototype = Object.create(ParserRuleContext.prototype);
InterpreterRuleContext.prototype.constructor = InterpreterRuleContext;

exports.ParserRuleContext = ParserRuleContext;

/***/ }),

/***/ "./node_modules/antlr4/PredictionContext.js":
/*!**************************************************!*\
  !*** ./node_modules/antlr4/PredictionContext.js ***!
  \**************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
///

var RuleContext = __webpack_require__(/*! ./RuleContext */ "./node_modules/antlr4/RuleContext.js").RuleContext;
var Hash = __webpack_require__(/*! ./Utils */ "./node_modules/antlr4/Utils.js").Hash;
var Map = __webpack_require__(/*! ./Utils */ "./node_modules/antlr4/Utils.js").Map;

function PredictionContext(cachedHashCode) {
	this.cachedHashCode = cachedHashCode;
}

// Represents {@code $} in local context prediction, which means wildcard.
// {@code//+x =//}.
// /
PredictionContext.EMPTY = null;

// Represents {@code $} in an array in full context mode, when {@code $}
// doesn't mean wildcard: {@code $ + x = [$,x]}. Here,
// {@code $} = {@link //EMPTY_RETURN_STATE}.
// /
PredictionContext.EMPTY_RETURN_STATE = 0x7FFFFFFF;

PredictionContext.globalNodeCount = 1;
PredictionContext.id = PredictionContext.globalNodeCount;

// Stores the computed hash code of this {@link PredictionContext}. The hash
// code is computed in parts to match the following reference algorithm.
//
// <pre>
// private int referenceHashCode() {
// int hash = {@link MurmurHash//initialize MurmurHash.initialize}({@link
// //INITIAL_HASH});
//
// for (int i = 0; i &lt; {@link //size()}; i++) {
// hash = {@link MurmurHash//update MurmurHash.update}(hash, {@link //getParent
// getParent}(i));
// }
//
// for (int i = 0; i &lt; {@link //size()}; i++) {
// hash = {@link MurmurHash//update MurmurHash.update}(hash, {@link
// //getReturnState getReturnState}(i));
// }
//
// hash = {@link MurmurHash//finish MurmurHash.finish}(hash, 2// {@link
// //size()});
// return hash;
// }
// </pre>
// /

// This means only the {@link //EMPTY} context is in set.
PredictionContext.prototype.isEmpty = function() {
	return this === PredictionContext.EMPTY;
};

PredictionContext.prototype.hasEmptyPath = function() {
	return this.getReturnState(this.length - 1) === PredictionContext.EMPTY_RETURN_STATE;
};

PredictionContext.prototype.hashCode = function() {
	return this.cachedHashCode;
};


PredictionContext.prototype.updateHashCode = function(hash) {
    hash.update(this.cachedHashCode);
};
/*
function calculateHashString(parent, returnState) {
	return "" + parent + returnState;
}
*/

// Used to cache {@link PredictionContext} objects. Its used for the shared
// context cash associated with contexts in DFA states. This cache
// can be used for both lexers and parsers.

function PredictionContextCache() {
	this.cache = new Map();
	return this;
}

// Add a context to the cache and return it. If the context already exists,
// return that one instead and do not add a new context to the cache.
// Protect shared cache from unsafe thread access.
//
PredictionContextCache.prototype.add = function(ctx) {
	if (ctx === PredictionContext.EMPTY) {
		return PredictionContext.EMPTY;
	}
	var existing = this.cache.get(ctx) || null;
	if (existing !== null) {
		return existing;
	}
	this.cache.put(ctx, ctx);
	return ctx;
};

PredictionContextCache.prototype.get = function(ctx) {
	return this.cache.get(ctx) || null;
};

Object.defineProperty(PredictionContextCache.prototype, "length", {
	get : function() {
		return this.cache.length;
	}
});

function SingletonPredictionContext(parent, returnState) {
	var hashCode = 0;
	var hash = new Hash();
	if(parent !== null) {
		hash.update(parent, returnState);
	} else {
		hash.update(1);
	}
	hashCode = hash.finish();
	PredictionContext.call(this, hashCode);
	this.parentCtx = parent;
	this.returnState = returnState;
}

SingletonPredictionContext.prototype = Object.create(PredictionContext.prototype);
SingletonPredictionContext.prototype.contructor = SingletonPredictionContext;

SingletonPredictionContext.create = function(parent, returnState) {
	if (returnState === PredictionContext.EMPTY_RETURN_STATE && parent === null) {
		// someone can pass in the bits of an array ctx that mean $
		return PredictionContext.EMPTY;
	} else {
		return new SingletonPredictionContext(parent, returnState);
	}
};

Object.defineProperty(SingletonPredictionContext.prototype, "length", {
	get : function() {
		return 1;
	}
});

SingletonPredictionContext.prototype.getParent = function(index) {
	return this.parentCtx;
};

SingletonPredictionContext.prototype.getReturnState = function(index) {
	return this.returnState;
};

SingletonPredictionContext.prototype.equals = function(other) {
	if (this === other) {
		return true;
	} else if (!(other instanceof SingletonPredictionContext)) {
		return false;
	} else if (this.hashCode() !== other.hashCode()) {
		return false; // can't be same if hash is different
	} else {
		if(this.returnState !== other.returnState)
            return false;
        else if(this.parentCtx==null)
            return other.parentCtx==null
		else
            return this.parentCtx.equals(other.parentCtx);
	}
};

SingletonPredictionContext.prototype.toString = function() {
	var up = this.parentCtx === null ? "" : this.parentCtx.toString();
	if (up.length === 0) {
		if (this.returnState === PredictionContext.EMPTY_RETURN_STATE) {
			return "$";
		} else {
			return "" + this.returnState;
		}
	} else {
		return "" + this.returnState + " " + up;
	}
};

function EmptyPredictionContext() {
	SingletonPredictionContext.call(this, null, PredictionContext.EMPTY_RETURN_STATE);
	return this;
}

EmptyPredictionContext.prototype = Object.create(SingletonPredictionContext.prototype);
EmptyPredictionContext.prototype.constructor = EmptyPredictionContext;

EmptyPredictionContext.prototype.isEmpty = function() {
	return true;
};

EmptyPredictionContext.prototype.getParent = function(index) {
	return null;
};

EmptyPredictionContext.prototype.getReturnState = function(index) {
	return this.returnState;
};

EmptyPredictionContext.prototype.equals = function(other) {
	return this === other;
};

EmptyPredictionContext.prototype.toString = function() {
	return "$";
};

PredictionContext.EMPTY = new EmptyPredictionContext();

function ArrayPredictionContext(parents, returnStates) {
	// Parent can be null only if full ctx mode and we make an array
	// from {@link //EMPTY} and non-empty. We merge {@link //EMPTY} by using
	// null parent and
	// returnState == {@link //EMPTY_RETURN_STATE}.
	var h = new Hash();
	h.update(parents, returnStates);
	var hashCode = h.finish();
	PredictionContext.call(this, hashCode);
	this.parents = parents;
	this.returnStates = returnStates;
	return this;
}

ArrayPredictionContext.prototype = Object.create(PredictionContext.prototype);
ArrayPredictionContext.prototype.constructor = ArrayPredictionContext;

ArrayPredictionContext.prototype.isEmpty = function() {
	// since EMPTY_RETURN_STATE can only appear in the last position, we
	// don't need to verify that size==1
	return this.returnStates[0] === PredictionContext.EMPTY_RETURN_STATE;
};

Object.defineProperty(ArrayPredictionContext.prototype, "length", {
	get : function() {
		return this.returnStates.length;
	}
});

ArrayPredictionContext.prototype.getParent = function(index) {
	return this.parents[index];
};

ArrayPredictionContext.prototype.getReturnState = function(index) {
	return this.returnStates[index];
};

ArrayPredictionContext.prototype.equals = function(other) {
	if (this === other) {
		return true;
	} else if (!(other instanceof ArrayPredictionContext)) {
		return false;
	} else if (this.hashCode() !== other.hashCode()) {
		return false; // can't be same if hash is different
	} else {
		return this.returnStates === other.returnStates &&
				this.parents === other.parents;
	}
};

ArrayPredictionContext.prototype.toString = function() {
	if (this.isEmpty()) {
		return "[]";
	} else {
		var s = "[";
		for (var i = 0; i < this.returnStates.length; i++) {
			if (i > 0) {
				s = s + ", ";
			}
			if (this.returnStates[i] === PredictionContext.EMPTY_RETURN_STATE) {
				s = s + "$";
				continue;
			}
			s = s + this.returnStates[i];
			if (this.parents[i] !== null) {
				s = s + " " + this.parents[i];
			} else {
				s = s + "null";
			}
		}
		return s + "]";
	}
};

// Convert a {@link RuleContext} tree to a {@link PredictionContext} graph.
// Return {@link //EMPTY} if {@code outerContext} is empty or null.
// /
function predictionContextFromRuleContext(atn, outerContext) {
	if (outerContext === undefined || outerContext === null) {
		outerContext = RuleContext.EMPTY;
	}
	// if we are in RuleContext of start rule, s, then PredictionContext
	// is EMPTY. Nobody called us. (if we are empty, return empty)
	if (outerContext.parentCtx === null || outerContext === RuleContext.EMPTY) {
		return PredictionContext.EMPTY;
	}
	// If we have a parent, convert it to a PredictionContext graph
	var parent = predictionContextFromRuleContext(atn, outerContext.parentCtx);
	var state = atn.states[outerContext.invokingState];
	var transition = state.transitions[0];
	return SingletonPredictionContext.create(parent, transition.followState.stateNumber);
}
/*
function calculateListsHashString(parents, returnStates) {
	var s = "";
	parents.map(function(p) {
		s = s + p;
	});
	returnStates.map(function(r) {
		s = s + r;
	});
	return s;
}
*/
function merge(a, b, rootIsWildcard, mergeCache) {
	// share same graph if both same
	if (a === b) {
		return a;
	}
	if (a instanceof SingletonPredictionContext && b instanceof SingletonPredictionContext) {
		return mergeSingletons(a, b, rootIsWildcard, mergeCache);
	}
	// At least one of a or b is array
	// If one is $ and rootIsWildcard, return $ as// wildcard
	if (rootIsWildcard) {
		if (a instanceof EmptyPredictionContext) {
			return a;
		}
		if (b instanceof EmptyPredictionContext) {
			return b;
		}
	}
	// convert singleton so both are arrays to normalize
	if (a instanceof SingletonPredictionContext) {
		a = new ArrayPredictionContext([a.getParent()], [a.returnState]);
	}
	if (b instanceof SingletonPredictionContext) {
		b = new ArrayPredictionContext([b.getParent()], [b.returnState]);
	}
	return mergeArrays(a, b, rootIsWildcard, mergeCache);
}

//
// Merge two {@link SingletonPredictionContext} instances.
//
// <p>Stack tops equal, parents merge is same; return left graph.<br>
// <embed src="images/SingletonMerge_SameRootSamePar.svg"
// type="image/svg+xml"/></p>
//
// <p>Same stack top, parents differ; merge parents giving array node, then
// remainders of those graphs. A new root node is created to point to the
// merged parents.<br>
// <embed src="images/SingletonMerge_SameRootDiffPar.svg"
// type="image/svg+xml"/></p>
//
// <p>Different stack tops pointing to same parent. Make array node for the
// root where both element in the root point to the same (original)
// parent.<br>
// <embed src="images/SingletonMerge_DiffRootSamePar.svg"
// type="image/svg+xml"/></p>
//
// <p>Different stack tops pointing to different parents. Make array node for
// the root where each element points to the corresponding original
// parent.<br>
// <embed src="images/SingletonMerge_DiffRootDiffPar.svg"
// type="image/svg+xml"/></p>
//
// @param a the first {@link SingletonPredictionContext}
// @param b the second {@link SingletonPredictionContext}
// @param rootIsWildcard {@code true} if this is a local-context merge,
// otherwise false to indicate a full-context merge
// @param mergeCache
// /
function mergeSingletons(a, b, rootIsWildcard, mergeCache) {
	if (mergeCache !== null) {
		var previous = mergeCache.get(a, b);
		if (previous !== null) {
			return previous;
		}
		previous = mergeCache.get(b, a);
		if (previous !== null) {
			return previous;
		}
	}

	var rootMerge = mergeRoot(a, b, rootIsWildcard);
	if (rootMerge !== null) {
		if (mergeCache !== null) {
			mergeCache.set(a, b, rootMerge);
		}
		return rootMerge;
	}
	if (a.returnState === b.returnState) {
		var parent = merge(a.parentCtx, b.parentCtx, rootIsWildcard, mergeCache);
		// if parent is same as existing a or b parent or reduced to a parent,
		// return it
		if (parent === a.parentCtx) {
			return a; // ax + bx = ax, if a=b
		}
		if (parent === b.parentCtx) {
			return b; // ax + bx = bx, if a=b
		}
		// else: ax + ay = a'[x,y]
		// merge parents x and y, giving array node with x,y then remainders
		// of those graphs. dup a, a' points at merged array
		// new joined parent so create new singleton pointing to it, a'
		var spc = SingletonPredictionContext.create(parent, a.returnState);
		if (mergeCache !== null) {
			mergeCache.set(a, b, spc);
		}
		return spc;
	} else { // a != b payloads differ
		// see if we can collapse parents due to $+x parents if local ctx
		var singleParent = null;
		if (a === b || (a.parentCtx !== null && a.parentCtx === b.parentCtx)) { // ax +
																				// bx =
																				// [a,b]x
			singleParent = a.parentCtx;
		}
		if (singleParent !== null) { // parents are same
			// sort payloads and use same parent
			var payloads = [ a.returnState, b.returnState ];
			if (a.returnState > b.returnState) {
				payloads[0] = b.returnState;
				payloads[1] = a.returnState;
			}
			var parents = [ singleParent, singleParent ];
			var apc = new ArrayPredictionContext(parents, payloads);
			if (mergeCache !== null) {
				mergeCache.set(a, b, apc);
			}
			return apc;
		}
		// parents differ and can't merge them. Just pack together
		// into array; can't merge.
		// ax + by = [ax,by]
		var payloads = [ a.returnState, b.returnState ];
		var parents = [ a.parentCtx, b.parentCtx ];
		if (a.returnState > b.returnState) { // sort by payload
			payloads[0] = b.returnState;
			payloads[1] = a.returnState;
			parents = [ b.parentCtx, a.parentCtx ];
		}
		var a_ = new ArrayPredictionContext(parents, payloads);
		if (mergeCache !== null) {
			mergeCache.set(a, b, a_);
		}
		return a_;
	}
}

//
// Handle case where at least one of {@code a} or {@code b} is
// {@link //EMPTY}. In the following diagrams, the symbol {@code $} is used
// to represent {@link //EMPTY}.
//
// <h2>Local-Context Merges</h2>
//
// <p>These local-context merge operations are used when {@code rootIsWildcard}
// is true.</p>
//
// <p>{@link //EMPTY} is superset of any graph; return {@link //EMPTY}.<br>
// <embed src="images/LocalMerge_EmptyRoot.svg" type="image/svg+xml"/></p>
//
// <p>{@link //EMPTY} and anything is {@code //EMPTY}, so merged parent is
// {@code //EMPTY}; return left graph.<br>
// <embed src="images/LocalMerge_EmptyParent.svg" type="image/svg+xml"/></p>
//
// <p>Special case of last merge if local context.<br>
// <embed src="images/LocalMerge_DiffRoots.svg" type="image/svg+xml"/></p>
//
// <h2>Full-Context Merges</h2>
//
// <p>These full-context merge operations are used when {@code rootIsWildcard}
// is false.</p>
//
// <p><embed src="images/FullMerge_EmptyRoots.svg" type="image/svg+xml"/></p>
//
// <p>Must keep all contexts; {@link //EMPTY} in array is a special value (and
// null parent).<br>
// <embed src="images/FullMerge_EmptyRoot.svg" type="image/svg+xml"/></p>
//
// <p><embed src="images/FullMerge_SameRoot.svg" type="image/svg+xml"/></p>
//
// @param a the first {@link SingletonPredictionContext}
// @param b the second {@link SingletonPredictionContext}
// @param rootIsWildcard {@code true} if this is a local-context merge,
// otherwise false to indicate a full-context merge
// /
function mergeRoot(a, b, rootIsWildcard) {
	if (rootIsWildcard) {
		if (a === PredictionContext.EMPTY) {
			return PredictionContext.EMPTY; // // + b =//
		}
		if (b === PredictionContext.EMPTY) {
			return PredictionContext.EMPTY; // a +// =//
		}
	} else {
		if (a === PredictionContext.EMPTY && b === PredictionContext.EMPTY) {
			return PredictionContext.EMPTY; // $ + $ = $
		} else if (a === PredictionContext.EMPTY) { // $ + x = [$,x]
			var payloads = [ b.returnState,
					PredictionContext.EMPTY_RETURN_STATE ];
			var parents = [ b.parentCtx, null ];
			return new ArrayPredictionContext(parents, payloads);
		} else if (b === PredictionContext.EMPTY) { // x + $ = [$,x] ($ is always first if present)
			var payloads = [ a.returnState, PredictionContext.EMPTY_RETURN_STATE ];
			var parents = [ a.parentCtx, null ];
			return new ArrayPredictionContext(parents, payloads);
		}
	}
	return null;
}

//
// Merge two {@link ArrayPredictionContext} instances.
//
// <p>Different tops, different parents.<br>
// <embed src="images/ArrayMerge_DiffTopDiffPar.svg" type="image/svg+xml"/></p>
//
// <p>Shared top, same parents.<br>
// <embed src="images/ArrayMerge_ShareTopSamePar.svg" type="image/svg+xml"/></p>
//
// <p>Shared top, different parents.<br>
// <embed src="images/ArrayMerge_ShareTopDiffPar.svg" type="image/svg+xml"/></p>
//
// <p>Shared top, all shared parents.<br>
// <embed src="images/ArrayMerge_ShareTopSharePar.svg"
// type="image/svg+xml"/></p>
//
// <p>Equal tops, merge parents and reduce top to
// {@link SingletonPredictionContext}.<br>
// <embed src="images/ArrayMerge_EqualTop.svg" type="image/svg+xml"/></p>
// /
function mergeArrays(a, b, rootIsWildcard, mergeCache) {
	if (mergeCache !== null) {
		var previous = mergeCache.get(a, b);
		if (previous !== null) {
			return previous;
		}
		previous = mergeCache.get(b, a);
		if (previous !== null) {
			return previous;
		}
	}
	// merge sorted payloads a + b => M
	var i = 0; // walks a
	var j = 0; // walks b
	var k = 0; // walks target M array

	var mergedReturnStates = [];
	var mergedParents = [];
	// walk and merge to yield mergedParents, mergedReturnStates
	while (i < a.returnStates.length && j < b.returnStates.length) {
		var a_parent = a.parents[i];
		var b_parent = b.parents[j];
		if (a.returnStates[i] === b.returnStates[j]) {
			// same payload (stack tops are equal), must yield merged singleton
			var payload = a.returnStates[i];
			// $+$ = $
			var bothDollars = payload === PredictionContext.EMPTY_RETURN_STATE &&
					a_parent === null && b_parent === null;
			var ax_ax = (a_parent !== null && b_parent !== null && a_parent === b_parent); // ax+ax
																							// ->
																							// ax
			if (bothDollars || ax_ax) {
				mergedParents[k] = a_parent; // choose left
				mergedReturnStates[k] = payload;
			} else { // ax+ay -> a'[x,y]
				var mergedParent = merge(a_parent, b_parent, rootIsWildcard, mergeCache);
				mergedParents[k] = mergedParent;
				mergedReturnStates[k] = payload;
			}
			i += 1; // hop over left one as usual
			j += 1; // but also skip one in right side since we merge
		} else if (a.returnStates[i] < b.returnStates[j]) { // copy a[i] to M
			mergedParents[k] = a_parent;
			mergedReturnStates[k] = a.returnStates[i];
			i += 1;
		} else { // b > a, copy b[j] to M
			mergedParents[k] = b_parent;
			mergedReturnStates[k] = b.returnStates[j];
			j += 1;
		}
		k += 1;
	}
	// copy over any payloads remaining in either array
	if (i < a.returnStates.length) {
		for (var p = i; p < a.returnStates.length; p++) {
			mergedParents[k] = a.parents[p];
			mergedReturnStates[k] = a.returnStates[p];
			k += 1;
		}
	} else {
		for (var p = j; p < b.returnStates.length; p++) {
			mergedParents[k] = b.parents[p];
			mergedReturnStates[k] = b.returnStates[p];
			k += 1;
		}
	}
	// trim merged if we combined a few that had same stack tops
	if (k < mergedParents.length) { // write index < last position; trim
		if (k === 1) { // for just one merged element, return singleton top
			var a_ = SingletonPredictionContext.create(mergedParents[0],
					mergedReturnStates[0]);
			if (mergeCache !== null) {
				mergeCache.set(a, b, a_);
			}
			return a_;
		}
		mergedParents = mergedParents.slice(0, k);
		mergedReturnStates = mergedReturnStates.slice(0, k);
	}

	var M = new ArrayPredictionContext(mergedParents, mergedReturnStates);

	// if we created same array as a or b, return that instead
	// TODO: track whether this is possible above during merge sort for speed
	if (M === a) {
		if (mergeCache !== null) {
			mergeCache.set(a, b, a);
		}
		return a;
	}
	if (M === b) {
		if (mergeCache !== null) {
			mergeCache.set(a, b, b);
		}
		return b;
	}
	combineCommonParents(mergedParents);

	if (mergeCache !== null) {
		mergeCache.set(a, b, M);
	}
	return M;
}

//
// Make pass over all <em>M</em> {@code parents}; merge any {@code equals()}
// ones.
// /
function combineCommonParents(parents) {
	var uniqueParents = new Map();

	for (var p = 0; p < parents.length; p++) {
		var parent = parents[p];
		if (!(uniqueParents.containsKey(parent))) {
			uniqueParents.put(parent, parent);
		}
	}
	for (var q = 0; q < parents.length; q++) {
		parents[q] = uniqueParents.get(parents[q]);
	}
}

function getCachedPredictionContext(context, contextCache, visited) {
	if (context.isEmpty()) {
		return context;
	}
	var existing = visited.get(context) || null;
	if (existing !== null) {
		return existing;
	}
	existing = contextCache.get(context);
	if (existing !== null) {
		visited.put(context, existing);
		return existing;
	}
	var changed = false;
	var parents = [];
	for (var i = 0; i < parents.length; i++) {
		var parent = getCachedPredictionContext(context.getParent(i), contextCache, visited);
		if (changed || parent !== context.getParent(i)) {
			if (!changed) {
				parents = [];
				for (var j = 0; j < context.length; j++) {
					parents[j] = context.getParent(j);
				}
				changed = true;
			}
			parents[i] = parent;
		}
	}
	if (!changed) {
		contextCache.add(context);
		visited.put(context, context);
		return context;
	}
	var updated = null;
	if (parents.length === 0) {
		updated = PredictionContext.EMPTY;
	} else if (parents.length === 1) {
		updated = SingletonPredictionContext.create(parents[0], context
				.getReturnState(0));
	} else {
		updated = new ArrayPredictionContext(parents, context.returnStates);
	}
	contextCache.add(updated);
	visited.put(updated, updated);
	visited.put(context, updated);

	return updated;
}

// ter's recursive version of Sam's getAllNodes()
function getAllContextNodes(context, nodes, visited) {
	if (nodes === null) {
		nodes = [];
		return getAllContextNodes(context, nodes, visited);
	} else if (visited === null) {
		visited = new Map();
		return getAllContextNodes(context, nodes, visited);
	} else {
		if (context === null || visited.containsKey(context)) {
			return nodes;
		}
		visited.put(context, context);
		nodes.push(context);
		for (var i = 0; i < context.length; i++) {
			getAllContextNodes(context.getParent(i), nodes, visited);
		}
		return nodes;
	}
}

exports.merge = merge;
exports.PredictionContext = PredictionContext;
exports.PredictionContextCache = PredictionContextCache;
exports.SingletonPredictionContext = SingletonPredictionContext;
exports.predictionContextFromRuleContext = predictionContextFromRuleContext;
exports.getCachedPredictionContext = getCachedPredictionContext;


/***/ }),

/***/ "./node_modules/antlr4/Recognizer.js":
/*!*******************************************!*\
  !*** ./node_modules/antlr4/Recognizer.js ***!
  \*******************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
//

var Token = __webpack_require__(/*! ./Token */ "./node_modules/antlr4/Token.js").Token;
var ConsoleErrorListener = __webpack_require__(/*! ./error/ErrorListener */ "./node_modules/antlr4/error/ErrorListener.js").ConsoleErrorListener;
var ProxyErrorListener = __webpack_require__(/*! ./error/ErrorListener */ "./node_modules/antlr4/error/ErrorListener.js").ProxyErrorListener;

function Recognizer() {
    this._listeners = [ ConsoleErrorListener.INSTANCE ];
    this._interp = null;
    this._stateNumber = -1;
    return this;
}

Recognizer.tokenTypeMapCache = {};
Recognizer.ruleIndexMapCache = {};


Recognizer.prototype.checkVersion = function(toolVersion) {
    var runtimeVersion = "4.8";
    if (runtimeVersion!==toolVersion) {
        console.log("ANTLR runtime and generated code versions disagree: "+runtimeVersion+"!="+toolVersion);
    }
};

Recognizer.prototype.addErrorListener = function(listener) {
    this._listeners.push(listener);
};

Recognizer.prototype.removeErrorListeners = function() {
    this._listeners = [];
};

Recognizer.prototype.getTokenTypeMap = function() {
    var tokenNames = this.getTokenNames();
    if (tokenNames===null) {
        throw("The current recognizer does not provide a list of token names.");
    }
    var result = this.tokenTypeMapCache[tokenNames];
    if(result===undefined) {
        result = tokenNames.reduce(function(o, k, i) { o[k] = i; });
        result.EOF = Token.EOF;
        this.tokenTypeMapCache[tokenNames] = result;
    }
    return result;
};

// Get a map from rule names to rule indexes.
//
// <p>Used for XPath and tree pattern compilation.</p>
//
Recognizer.prototype.getRuleIndexMap = function() {
    var ruleNames = this.ruleNames;
    if (ruleNames===null) {
        throw("The current recognizer does not provide a list of rule names.");
    }
    var result = this.ruleIndexMapCache[ruleNames];
    if(result===undefined) {
        result = ruleNames.reduce(function(o, k, i) { o[k] = i; });
        this.ruleIndexMapCache[ruleNames] = result;
    }
    return result;
};

Recognizer.prototype.getTokenType = function(tokenName) {
    var ttype = this.getTokenTypeMap()[tokenName];
    if (ttype !==undefined) {
        return ttype;
    } else {
        return Token.INVALID_TYPE;
    }
};


// What is the error header, normally line/character position information?//
Recognizer.prototype.getErrorHeader = function(e) {
    var line = e.getOffendingToken().line;
    var column = e.getOffendingToken().column;
    return "line " + line + ":" + column;
};


// How should a token be displayed in an error message? The default
//  is to display just the text, but during development you might
//  want to have a lot of information spit out.  Override in that case
//  to use t.toString() (which, for CommonToken, dumps everything about
//  the token). This is better than forcing you to override a method in
//  your token objects because you don't have to go modify your lexer
//  so that it creates a new Java type.
//
// @deprecated This method is not called by the ANTLR 4 Runtime. Specific
// implementations of {@link ANTLRErrorStrategy} may provide a similar
// feature when necessary. For example, see
// {@link DefaultErrorStrategy//getTokenErrorDisplay}.
//
Recognizer.prototype.getTokenErrorDisplay = function(t) {
    if (t===null) {
        return "<no token>";
    }
    var s = t.text;
    if (s===null) {
        if (t.type===Token.EOF) {
            s = "<EOF>";
        } else {
            s = "<" + t.type + ">";
        }
    }
    s = s.replace("\n","\\n").replace("\r","\\r").replace("\t","\\t");
    return "'" + s + "'";
};

Recognizer.prototype.getErrorListenerDispatch = function() {
    return new ProxyErrorListener(this._listeners);
};

// subclass needs to override these if there are sempreds or actions
// that the ATN interp needs to execute
Recognizer.prototype.sempred = function(localctx, ruleIndex, actionIndex) {
    return true;
};

Recognizer.prototype.precpred = function(localctx , precedence) {
    return true;
};

//Indicate that the recognizer has changed internal state that is
//consistent with the ATN state passed in.  This way we always know
//where we are in the ATN as the parser goes along. The rule
//context objects form a stack that lets us see the stack of
//invoking rules. Combine this and we have complete ATN
//configuration information.

Object.defineProperty(Recognizer.prototype, "state", {
	get : function() {
		return this._stateNumber;
	},
	set : function(state) {
		this._stateNumber = state;
	}
});


exports.Recognizer = Recognizer;


/***/ }),

/***/ "./node_modules/antlr4/RuleContext.js":
/*!********************************************!*\
  !*** ./node_modules/antlr4/RuleContext.js ***!
  \********************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
///

//  A rule context is a record of a single rule invocation. It knows
//  which context invoked it, if any. If there is no parent context, then
//  naturally the invoking state is not valid.  The parent link
//  provides a chain upwards from the current rule invocation to the root
//  of the invocation tree, forming a stack. We actually carry no
//  information about the rule associated with this context (except
//  when parsing). We keep only the state number of the invoking state from
//  the ATN submachine that invoked this. Contrast this with the s
//  pointer inside ParserRuleContext that tracks the current state
//  being "executed" for the current rule.
//
//  The parent contexts are useful for computing lookahead sets and
//  getting error information.
//
//  These objects are used during parsing and prediction.
//  For the special case of parsers, we use the subclass
//  ParserRuleContext.
//
//  @see ParserRuleContext
///

var RuleNode = __webpack_require__(/*! ./tree/Tree */ "./node_modules/antlr4/tree/Tree.js").RuleNode;
var INVALID_INTERVAL = __webpack_require__(/*! ./tree/Tree */ "./node_modules/antlr4/tree/Tree.js").INVALID_INTERVAL;
var INVALID_ALT_NUMBER = __webpack_require__(/*! ./atn/ATN */ "./node_modules/antlr4/atn/ATN.js").INVALID_ALT_NUMBER;

function RuleContext(parent, invokingState) {
	RuleNode.call(this);
	// What context invoked this rule?
	this.parentCtx = parent || null;
	// What state invoked the rule associated with this context?
	// The "return address" is the followState of invokingState
	// If parent is null, this should be -1.
	this.invokingState = invokingState || -1;
	return this;
}

RuleContext.prototype = Object.create(RuleNode.prototype);
RuleContext.prototype.constructor = RuleContext;

RuleContext.prototype.depth = function() {
	var n = 0;
	var p = this;
	while (p !== null) {
		p = p.parentCtx;
		n += 1;
	}
	return n;
};

// A context is empty if there is no invoking state; meaning nobody call
// current context.
RuleContext.prototype.isEmpty = function() {
	return this.invokingState === -1;
};

// satisfy the ParseTree / SyntaxTree interface

RuleContext.prototype.getSourceInterval = function() {
	return INVALID_INTERVAL;
};

RuleContext.prototype.getRuleContext = function() {
	return this;
};

RuleContext.prototype.getPayload = function() {
	return this;
};

// Return the combined text of all child nodes. This method only considers
// tokens which have been added to the parse tree.
// <p>
// Since tokens on hidden channels (e.g. whitespace or comments) are not
// added to the parse trees, they will not appear in the output of this
// method.
// /
RuleContext.prototype.getText = function() {
	if (this.getChildCount() === 0) {
		return "";
	} else {
		return this.children.map(function(child) {
			return child.getText();
		}).join("");
	}
};

// For rule associated with this parse tree internal node, return
// the outer alternative number used to match the input. Default
// implementation does not compute nor store this alt num. Create
// a subclass of ParserRuleContext with backing field and set
// option contextSuperClass.
// to set it.
RuleContext.prototype.getAltNumber = function() { return INVALID_ALT_NUMBER; }

// Set the outer alternative number for this context node. Default
// implementation does nothing to avoid backing field overhead for
// trees that don't need it.  Create
// a subclass of ParserRuleContext with backing field and set
// option contextSuperClass.
RuleContext.prototype.setAltNumber = function(altNumber) { }

RuleContext.prototype.getChild = function(i) {
	return null;
};

RuleContext.prototype.getChildCount = function() {
	return 0;
};

RuleContext.prototype.accept = function(visitor) {
	return visitor.visitChildren(this);
};

//need to manage circular dependencies, so export now
exports.RuleContext = RuleContext;
var Trees = __webpack_require__(/*! ./tree/Trees */ "./node_modules/antlr4/tree/Trees.js").Trees;


// Print out a whole tree, not just a node, in LISP format
// (root child1 .. childN). Print just a node if this is a leaf.
//

RuleContext.prototype.toStringTree = function(ruleNames, recog) {
	return Trees.toStringTree(this, ruleNames, recog);
};

RuleContext.prototype.toString = function(ruleNames, stop) {
	ruleNames = ruleNames || null;
	stop = stop || null;
	var p = this;
	var s = "[";
	while (p !== null && p !== stop) {
		if (ruleNames === null) {
			if (!p.isEmpty()) {
				s += p.invokingState;
			}
		} else {
			var ri = p.ruleIndex;
			var ruleName = (ri >= 0 && ri < ruleNames.length) ? ruleNames[ri]
					: "" + ri;
			s += ruleName;
		}
		if (p.parentCtx !== null && (ruleNames !== null || !p.parentCtx.isEmpty())) {
			s += " ";
		}
		p = p.parentCtx;
	}
	s += "]";
	return s;
};



/***/ }),

/***/ "./node_modules/antlr4/Token.js":
/*!**************************************!*\
  !*** ./node_modules/antlr4/Token.js ***!
  \**************************************/
/*! no static exports found */
/***/ (function(module, exports) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
//

// A token has properties: text, type, line, character position in the line
// (so we can ignore tabs), token channel, index, and source from which
// we obtained this token.

function Token() {
	this.source = null;
	this.type = null; // token type of the token
	this.channel = null; // The parser ignores everything not on DEFAULT_CHANNEL
	this.start = null; // optional; return -1 if not implemented.
	this.stop = null; // optional; return -1 if not implemented.
	this.tokenIndex = null; // from 0..n-1 of the token object in the input stream
	this.line = null; // line=1..n of the 1st character
	this.column = null; // beginning of the line at which it occurs, 0..n-1
	this._text = null; // text of the token.
	return this;
}

Token.INVALID_TYPE = 0;

// During lookahead operations, this "token" signifies we hit rule end ATN state
// and did not follow it despite needing to.
Token.EPSILON = -2;

Token.MIN_USER_TOKEN_TYPE = 1;

Token.EOF = -1;

// All tokens go to the parser (unless skip() is called in that rule)
// on a particular "channel". The parser tunes to a particular channel
// so that whitespace etc... can go to the parser on a "hidden" channel.

Token.DEFAULT_CHANNEL = 0;

// Anything on different channel than DEFAULT_CHANNEL is not parsed
// by parser.

Token.HIDDEN_CHANNEL = 1;

// Explicitly set the text for this token. If {code text} is not
// {@code null}, then {@link //getText} will return this value rather than
// extracting the text from the input.
//
// @param text The explicit text of the token, or {@code null} if the text
// should be obtained from the input along with the start and stop indexes
// of the token.

Object.defineProperty(Token.prototype, "text", {
	get : function() {
		return this._text;
	},
	set : function(text) {
		this._text = text;
	}
});

Token.prototype.getTokenSource = function() {
	return this.source[0];
};

Token.prototype.getInputStream = function() {
	return this.source[1];
};

function CommonToken(source, type, channel, start, stop) {
	Token.call(this);
	this.source = source !== undefined ? source : CommonToken.EMPTY_SOURCE;
	this.type = type !== undefined ? type : null;
	this.channel = channel !== undefined ? channel : Token.DEFAULT_CHANNEL;
	this.start = start !== undefined ? start : -1;
	this.stop = stop !== undefined ? stop : -1;
	this.tokenIndex = -1;
	if (this.source[0] !== null) {
		this.line = source[0].line;
		this.column = source[0].column;
	} else {
		this.column = -1;
	}
	return this;
}

CommonToken.prototype = Object.create(Token.prototype);
CommonToken.prototype.constructor = CommonToken;

// An empty {@link Pair} which is used as the default value of
// {@link //source} for tokens that do not have a source.
CommonToken.EMPTY_SOURCE = [ null, null ];

// Constructs a new {@link CommonToken} as a copy of another {@link Token}.
//
// <p>
// If {@code oldToken} is also a {@link CommonToken} instance, the newly
// constructed token will share a reference to the {@link //text} field and
// the {@link Pair} stored in {@link //source}. Otherwise, {@link //text} will
// be assigned the result of calling {@link //getText}, and {@link //source}
// will be constructed from the result of {@link Token//getTokenSource} and
// {@link Token//getInputStream}.</p>
//
// @param oldToken The token to copy.
//
CommonToken.prototype.clone = function() {
	var t = new CommonToken(this.source, this.type, this.channel, this.start,
			this.stop);
	t.tokenIndex = this.tokenIndex;
	t.line = this.line;
	t.column = this.column;
	t.text = this.text;
	return t;
};

Object.defineProperty(CommonToken.prototype, "text", {
	get : function() {
		if (this._text !== null) {
			return this._text;
		}
		var input = this.getInputStream();
		if (input === null) {
			return null;
		}
		var n = input.size;
		if (this.start < n && this.stop < n) {
			return input.getText(this.start, this.stop);
		} else {
			return "<EOF>";
		}
	},
	set : function(text) {
		this._text = text;
	}
});

CommonToken.prototype.toString = function() {
	var txt = this.text;
	if (txt !== null) {
		txt = txt.replace(/\n/g, "\\n").replace(/\r/g, "\\r").replace(/\t/g, "\\t");
	} else {
		txt = "<no text>";
	}
	return "[@" + this.tokenIndex + "," + this.start + ":" + this.stop + "='" +
			txt + "',<" + this.type + ">" +
			(this.channel > 0 ? ",channel=" + this.channel : "") + "," +
			this.line + ":" + this.column + "]";
};

exports.Token = Token;
exports.CommonToken = CommonToken;


/***/ }),

/***/ "./node_modules/antlr4/Utils.js":
/*!**************************************!*\
  !*** ./node_modules/antlr4/Utils.js ***!
  \**************************************/
/*! no static exports found */
/***/ (function(module, exports) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

function arrayToString(a) {
    return "[" + a.join(", ") + "]";
}

String.prototype.seed = String.prototype.seed || Math.round(Math.random() * Math.pow(2, 32));

String.prototype.hashCode = function () {
    var remainder, bytes, h1, h1b, c1, c1b, c2, c2b, k1, i,
        key = this.toString();

    remainder = key.length & 3; // key.length % 4
    bytes = key.length - remainder;
    h1 = String.prototype.seed;
    c1 = 0xcc9e2d51;
    c2 = 0x1b873593;
    i = 0;

    while (i < bytes) {
        k1 =
            ((key.charCodeAt(i) & 0xff)) |
            ((key.charCodeAt(++i) & 0xff) << 8) |
            ((key.charCodeAt(++i) & 0xff) << 16) |
            ((key.charCodeAt(++i) & 0xff) << 24);
        ++i;

        k1 = ((((k1 & 0xffff) * c1) + ((((k1 >>> 16) * c1) & 0xffff) << 16))) & 0xffffffff;
        k1 = (k1 << 15) | (k1 >>> 17);
        k1 = ((((k1 & 0xffff) * c2) + ((((k1 >>> 16) * c2) & 0xffff) << 16))) & 0xffffffff;

        h1 ^= k1;
        h1 = (h1 << 13) | (h1 >>> 19);
        h1b = ((((h1 & 0xffff) * 5) + ((((h1 >>> 16) * 5) & 0xffff) << 16))) & 0xffffffff;
        h1 = (((h1b & 0xffff) + 0x6b64) + ((((h1b >>> 16) + 0xe654) & 0xffff) << 16));
    }

    k1 = 0;

    switch (remainder) {
        case 3:
            k1 ^= (key.charCodeAt(i + 2) & 0xff) << 16;
        case 2:
            k1 ^= (key.charCodeAt(i + 1) & 0xff) << 8;
        case 1:
            k1 ^= (key.charCodeAt(i) & 0xff);

            k1 = (((k1 & 0xffff) * c1) + ((((k1 >>> 16) * c1) & 0xffff) << 16)) & 0xffffffff;
            k1 = (k1 << 15) | (k1 >>> 17);
            k1 = (((k1 & 0xffff) * c2) + ((((k1 >>> 16) * c2) & 0xffff) << 16)) & 0xffffffff;
            h1 ^= k1;
    }

    h1 ^= key.length;

    h1 ^= h1 >>> 16;
    h1 = (((h1 & 0xffff) * 0x85ebca6b) + ((((h1 >>> 16) * 0x85ebca6b) & 0xffff) << 16)) & 0xffffffff;
    h1 ^= h1 >>> 13;
    h1 = ((((h1 & 0xffff) * 0xc2b2ae35) + ((((h1 >>> 16) * 0xc2b2ae35) & 0xffff) << 16))) & 0xffffffff;
    h1 ^= h1 >>> 16;

    return h1 >>> 0;
};

function standardEqualsFunction(a, b) {
    return a.equals(b);
}

function standardHashCodeFunction(a) {
    return a.hashCode();
}

function Set(hashFunction, equalsFunction) {
    this.data = {};
    this.hashFunction = hashFunction || standardHashCodeFunction;
    this.equalsFunction = equalsFunction || standardEqualsFunction;
    return this;
}

Object.defineProperty(Set.prototype, "length", {
    get: function () {
        var l = 0;
        for (var key in this.data) {
            if (key.indexOf("hash_") === 0) {
                l = l + this.data[key].length;
            }
        }
        return l;
    }
});

Set.prototype.add = function (value) {
    var hash = this.hashFunction(value);
    var key = "hash_" + hash;
    if (key in this.data) {
        var values = this.data[key];
        for (var i = 0; i < values.length; i++) {
            if (this.equalsFunction(value, values[i])) {
                return values[i];
            }
        }
        values.push(value);
        return value;
    } else {
        this.data[key] = [value];
        return value;
    }
};

Set.prototype.contains = function (value) {
    return this.get(value) != null;
};

Set.prototype.get = function (value) {
    var hash = this.hashFunction(value);
    var key = "hash_" + hash;
    if (key in this.data) {
        var values = this.data[key];
        for (var i = 0; i < values.length; i++) {
            if (this.equalsFunction(value, values[i])) {
                return values[i];
            }
        }
    }
    return null;
};

Set.prototype.values = function () {
    var l = [];
    for (var key in this.data) {
        if (key.indexOf("hash_") === 0) {
            l = l.concat(this.data[key]);
        }
    }
    return l;
};

Set.prototype.toString = function () {
    return arrayToString(this.values());
};

function BitSet() {
    this.data = [];
    return this;
}

BitSet.prototype.add = function (value) {
    this.data[value] = true;
};

BitSet.prototype.or = function (set) {
    var bits = this;
    Object.keys(set.data).map(function (alt) {
        bits.add(alt);
    });
};

BitSet.prototype.remove = function (value) {
    delete this.data[value];
};

BitSet.prototype.contains = function (value) {
    return this.data[value] === true;
};

BitSet.prototype.values = function () {
    return Object.keys(this.data);
};

BitSet.prototype.minValue = function () {
    return Math.min.apply(null, this.values());
};

BitSet.prototype.hashCode = function () {
    var hash = new Hash();
    hash.update(this.values());
    return hash.finish();
};

BitSet.prototype.equals = function (other) {
    if (!(other instanceof BitSet)) {
        return false;
    }
    return this.hashCode() === other.hashCode();
};

Object.defineProperty(BitSet.prototype, "length", {
    get: function () {
        return this.values().length;
    }
});

BitSet.prototype.toString = function () {
    return "{" + this.values().join(", ") + "}";
};

function Map(hashFunction, equalsFunction) {
    this.data = {};
    this.hashFunction = hashFunction || standardHashCodeFunction;
    this.equalsFunction = equalsFunction || standardEqualsFunction;
    return this;
}

Object.defineProperty(Map.prototype, "length", {
    get: function () {
        var l = 0;
        for (var hashKey in this.data) {
            if (hashKey.indexOf("hash_") === 0) {
                l = l + this.data[hashKey].length;
            }
        }
        return l;
    }
});

Map.prototype.put = function (key, value) {
    var hashKey = "hash_" + this.hashFunction(key);
    if (hashKey in this.data) {
        var entries = this.data[hashKey];
        for (var i = 0; i < entries.length; i++) {
            var entry = entries[i];
            if (this.equalsFunction(key, entry.key)) {
                var oldValue = entry.value;
                entry.value = value;
                return oldValue;
            }
        }
        entries.push({key:key, value:value});
        return value;
    } else {
        this.data[hashKey] = [{key:key, value:value}];
        return value;
    }
};

Map.prototype.containsKey = function (key) {
    var hashKey = "hash_" + this.hashFunction(key);
    if(hashKey in this.data) {
        var entries = this.data[hashKey];
        for (var i = 0; i < entries.length; i++) {
            var entry = entries[i];
            if (this.equalsFunction(key, entry.key))
                return true;
        }
    }
    return false;
};

Map.prototype.get = function (key) {
    var hashKey = "hash_" + this.hashFunction(key);
    if(hashKey in this.data) {
        var entries = this.data[hashKey];
        for (var i = 0; i < entries.length; i++) {
            var entry = entries[i];
            if (this.equalsFunction(key, entry.key))
                return entry.value;
        }
    }
    return null;
};

Map.prototype.entries = function () {
    var l = [];
    for (var key in this.data) {
        if (key.indexOf("hash_") === 0) {
            l = l.concat(this.data[key]);
        }
    }
    return l;
};


Map.prototype.getKeys = function () {
    return this.entries().map(function(e) {
        return e.key;
    });
};


Map.prototype.getValues = function () {
    return this.entries().map(function(e) {
            return e.value;
    });
};


Map.prototype.toString = function () {
    var ss = this.entries().map(function(entry) {
        return '{' + entry.key + ':' + entry.value + '}';
    });
    return '[' + ss.join(", ") + ']';
};


function AltDict() {
    this.data = {};
    return this;
}


AltDict.prototype.get = function (key) {
    key = "k-" + key;
    if (key in this.data) {
        return this.data[key];
    } else {
        return null;
    }
};

AltDict.prototype.put = function (key, value) {
    key = "k-" + key;
    this.data[key] = value;
};

AltDict.prototype.values = function () {
    var data = this.data;
    var keys = Object.keys(this.data);
    return keys.map(function (key) {
        return data[key];
    });
};

function DoubleDict(defaultMapCtor) {
    this.defaultMapCtor = defaultMapCtor || Map;
    this.cacheMap = new this.defaultMapCtor();
    return this;
}

function Hash() {
    this.count = 0;
    this.hash = 0;
    return this;
}

Hash.prototype.update = function () {
    for(var i=0;i<arguments.length;i++) {
        var value = arguments[i];
        if (value == null)
            continue;
        if(Array.isArray(value))
            this.update.apply(this, value);
        else {
            var k = 0;
            switch (typeof(value)) {
                case 'undefined':
                case 'function':
                    continue;
                case 'number':
                case 'boolean':
                    k = value;
                    break;
                case 'string':
                    k = value.hashCode();
                    break;
                default:
                    if(value.updateHashCode)
                        value.updateHashCode(this);
                    else
                        console.log("No updateHashCode for " + value.toString())
                    continue;
            }
            k = k * 0xCC9E2D51;
            k = (k << 15) | (k >>> (32 - 15));
            k = k * 0x1B873593;
            this.count = this.count + 1;
            var hash = this.hash ^ k;
            hash = (hash << 13) | (hash >>> (32 - 13));
            hash = hash * 5 + 0xE6546B64;
            this.hash = hash;
        }
    }
};

Hash.prototype.finish = function () {
    var hash = this.hash ^ (this.count * 4);
    hash = hash ^ (hash >>> 16);
    hash = hash * 0x85EBCA6B;
    hash = hash ^ (hash >>> 13);
    hash = hash * 0xC2B2AE35;
    hash = hash ^ (hash >>> 16);
    return hash;
};

function hashStuff() {
    var hash = new Hash();
    hash.update.apply(hash, arguments);
    return hash.finish();
}

DoubleDict.prototype.get = function (a, b) {
    var d = this.cacheMap.get(a) || null;
    return d === null ? null : (d.get(b) || null);
};

DoubleDict.prototype.set = function (a, b, o) {
    var d = this.cacheMap.get(a) || null;
    if (d === null) {
        d = new this.defaultMapCtor();
        this.cacheMap.put(a, d);
    }
    d.put(b, o);
};


function escapeWhitespace(s, escapeSpaces) {
    s = s.replace(/\t/g, "\\t")
         .replace(/\n/g, "\\n")
         .replace(/\r/g, "\\r");
    if (escapeSpaces) {
        s = s.replace(/ /g, "\u00B7");
    }
    return s;
}

function titleCase(str) {
    return str.replace(/\w\S*/g, function (txt) {
        return txt.charAt(0).toUpperCase() + txt.substr(1);
    });
};

function equalArrays(a, b)
{
    if (!Array.isArray(a) || !Array.isArray(b))
        return false;
    if (a == b)
        return true;
    if (a.length != b.length)
        return false;
    for (var i = 0; i < a.length; i++) {
        if (a[i] == b[i])
            continue;
        if (!a[i].equals(b[i]))
            return false;
    }
    return true;
};

exports.Hash = Hash;
exports.Set = Set;
exports.Map = Map;
exports.BitSet = BitSet;
exports.AltDict = AltDict;
exports.DoubleDict = DoubleDict;
exports.hashStuff = hashStuff;
exports.escapeWhitespace = escapeWhitespace;
exports.arrayToString = arrayToString;
exports.titleCase = titleCase;
exports.equalArrays = equalArrays;


/***/ }),

/***/ "./node_modules/antlr4/atn/ATN.js":
/*!****************************************!*\
  !*** ./node_modules/antlr4/atn/ATN.js ***!
  \****************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

var LL1Analyzer = __webpack_require__(/*! ./../LL1Analyzer */ "./node_modules/antlr4/LL1Analyzer.js").LL1Analyzer;
var IntervalSet = __webpack_require__(/*! ./../IntervalSet */ "./node_modules/antlr4/IntervalSet.js").IntervalSet;

function ATN(grammarType , maxTokenType) {

    // Used for runtime deserialization of ATNs from strings///
    // The type of the ATN.
    this.grammarType = grammarType;
    // The maximum value for any symbol recognized by a transition in the ATN.
    this.maxTokenType = maxTokenType;
    this.states = [];
    // Each subrule/rule is a decision point and we must track them so we
    //  can go back later and build DFA predictors for them.  This includes
    //  all the rules, subrules, optional blocks, ()+, ()* etc...
    this.decisionToState = [];
    // Maps from rule index to starting state number.
    this.ruleToStartState = [];
    // Maps from rule index to stop state number.
    this.ruleToStopState = null;
    this.modeNameToStartState = {};
    // For lexer ATNs, this maps the rule index to the resulting token type.
    // For parser ATNs, this maps the rule index to the generated bypass token
    // type if the
    // {@link ATNDeserializationOptions//isGenerateRuleBypassTransitions}
    // deserialization option was specified; otherwise, this is {@code null}.
    this.ruleToTokenType = null;
    // For lexer ATNs, this is an array of {@link LexerAction} objects which may
    // be referenced by action transitions in the ATN.
    this.lexerActions = null;
    this.modeToStartState = [];

    return this;
}

// Compute the set of valid tokens that can occur starting in state {@code s}.
//  If {@code ctx} is null, the set of tokens will not include what can follow
//  the rule surrounding {@code s}. In other words, the set will be
//  restricted to tokens reachable staying within {@code s}'s rule.
ATN.prototype.nextTokensInContext = function(s, ctx) {
    var anal = new LL1Analyzer(this);
    return anal.LOOK(s, null, ctx);
};

// Compute the set of valid tokens that can occur starting in {@code s} and
// staying in same rule. {@link Token//EPSILON} is in set if we reach end of
// rule.
ATN.prototype.nextTokensNoContext = function(s) {
    if (s.nextTokenWithinRule !== null ) {
        return s.nextTokenWithinRule;
    }
    s.nextTokenWithinRule = this.nextTokensInContext(s, null);
    s.nextTokenWithinRule.readOnly = true;
    return s.nextTokenWithinRule;
};

ATN.prototype.nextTokens = function(s, ctx) {
    if ( ctx===undefined ) {
        return this.nextTokensNoContext(s);
    } else {
        return this.nextTokensInContext(s, ctx);
    }
};

ATN.prototype.addState = function( state) {
    if ( state !== null ) {
        state.atn = this;
        state.stateNumber = this.states.length;
    }
    this.states.push(state);
};

ATN.prototype.removeState = function( state) {
    this.states[state.stateNumber] = null; // just free mem, don't shift states in list
};

ATN.prototype.defineDecisionState = function( s) {
    this.decisionToState.push(s);
    s.decision = this.decisionToState.length-1;
    return s.decision;
};

ATN.prototype.getDecisionState = function( decision) {
    if (this.decisionToState.length===0) {
        return null;
    } else {
        return this.decisionToState[decision];
    }
};

// Computes the set of input symbols which could follow ATN state number
// {@code stateNumber} in the specified full {@code context}. This method
// considers the complete parser context, but does not evaluate semantic
// predicates (i.e. all predicates encountered during the calculation are
// assumed true). If a path in the ATN exists from the starting state to the
// {@link RuleStopState} of the outermost context without matching any
// symbols, {@link Token//EOF} is added to the returned set.
//
// <p>If {@code context} is {@code null}, it is treated as
// {@link ParserRuleContext//EMPTY}.</p>
//
// @param stateNumber the ATN state number
// @param context the full parse context
// @return The set of potentially valid input symbols which could follow the
// specified state in the specified context.
// @throws IllegalArgumentException if the ATN does not contain a state with
// number {@code stateNumber}
var Token = __webpack_require__(/*! ./../Token */ "./node_modules/antlr4/Token.js").Token;

ATN.prototype.getExpectedTokens = function( stateNumber, ctx ) {
    if ( stateNumber < 0 || stateNumber >= this.states.length ) {
        throw("Invalid state number.");
    }
    var s = this.states[stateNumber];
    var following = this.nextTokens(s);
    if (!following.contains(Token.EPSILON)) {
        return following;
    }
    var expected = new IntervalSet();
    expected.addSet(following);
    expected.removeOne(Token.EPSILON);
    while (ctx !== null && ctx.invokingState >= 0 && following.contains(Token.EPSILON)) {
        var invokingState = this.states[ctx.invokingState];
        var rt = invokingState.transitions[0];
        following = this.nextTokens(rt.followState);
        expected.addSet(following);
        expected.removeOne(Token.EPSILON);
        ctx = ctx.parentCtx;
    }
    if (following.contains(Token.EPSILON)) {
        expected.addOne(Token.EOF);
    }
    return expected;
};

ATN.INVALID_ALT_NUMBER = 0;

exports.ATN = ATN;

/***/ }),

/***/ "./node_modules/antlr4/atn/ATNConfig.js":
/*!**********************************************!*\
  !*** ./node_modules/antlr4/atn/ATNConfig.js ***!
  \**********************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
///

// A tuple: (ATN state, predicted alt, syntactic, semantic context).
//  The syntactic context is a graph-structured stack node whose
//  path(s) to the root is the rule invocation(s)
//  chain used to arrive at the state.  The semantic context is
//  the tree of semantic predicates encountered before reaching
//  an ATN state.
///

var DecisionState = __webpack_require__(/*! ./ATNState */ "./node_modules/antlr4/atn/ATNState.js").DecisionState;
var SemanticContext = __webpack_require__(/*! ./SemanticContext */ "./node_modules/antlr4/atn/SemanticContext.js").SemanticContext;
var Hash = __webpack_require__(/*! ../Utils */ "./node_modules/antlr4/Utils.js").Hash;


function checkParams(params, isCfg) {
	if(params===null) {
		var result = { state:null, alt:null, context:null, semanticContext:null };
		if(isCfg) {
			result.reachesIntoOuterContext = 0;
		}
		return result;
	} else {
		var props = {};
		props.state = params.state || null;
		props.alt = (params.alt === undefined) ? null : params.alt;
		props.context = params.context || null;
		props.semanticContext = params.semanticContext || null;
		if(isCfg) {
			props.reachesIntoOuterContext = params.reachesIntoOuterContext || 0;
			props.precedenceFilterSuppressed = params.precedenceFilterSuppressed || false;
		}
		return props;
	}
}

function ATNConfig(params, config) {
	this.checkContext(params, config);
	params = checkParams(params);
	config = checkParams(config, true);
    // The ATN state associated with this configuration///
    this.state = params.state!==null ? params.state : config.state;
    // What alt (or lexer rule) is predicted by this configuration///
    this.alt = params.alt!==null ? params.alt : config.alt;
    // The stack of invoking states leading to the rule/states associated
    //  with this config.  We track only those contexts pushed during
    //  execution of the ATN simulator.
    this.context = params.context!==null ? params.context : config.context;
    this.semanticContext = params.semanticContext!==null ? params.semanticContext :
        (config.semanticContext!==null ? config.semanticContext : SemanticContext.NONE);
    // We cannot execute predicates dependent upon local context unless
    // we know for sure we are in the correct context. Because there is
    // no way to do this efficiently, we simply cannot evaluate
    // dependent predicates unless we are in the rule that initially
    // invokes the ATN simulator.
    //
    // closure() tracks the depth of how far we dip into the
    // outer context: depth &gt; 0.  Note that it may not be totally
    // accurate depth since I don't ever decrement. TODO: make it a boolean then
    this.reachesIntoOuterContext = config.reachesIntoOuterContext;
    this.precedenceFilterSuppressed = config.precedenceFilterSuppressed;
    return this;
}

ATNConfig.prototype.checkContext = function(params, config) {
	if((params.context===null || params.context===undefined) &&
			(config===null || config.context===null || config.context===undefined)) {
		this.context = null;
	}
};


ATNConfig.prototype.hashCode = function() {
    var hash = new Hash();
    this.updateHashCode(hash);
    return hash.finish();
};


ATNConfig.prototype.updateHashCode = function(hash) {
    hash.update(this.state.stateNumber, this.alt, this.context, this.semanticContext);
};

// An ATN configuration is equal to another if both have
//  the same state, they predict the same alternative, and
//  syntactic/semantic contexts are the same.

ATNConfig.prototype.equals = function(other) {
    if (this === other) {
        return true;
    } else if (! (other instanceof ATNConfig)) {
        return false;
    } else {
        return this.state.stateNumber===other.state.stateNumber &&
            this.alt===other.alt &&
            (this.context===null ? other.context===null : this.context.equals(other.context)) &&
            this.semanticContext.equals(other.semanticContext) &&
            this.precedenceFilterSuppressed===other.precedenceFilterSuppressed;
    }
};


ATNConfig.prototype.hashCodeForConfigSet = function() {
    var hash = new Hash();
    hash.update(this.state.stateNumber, this.alt, this.semanticContext);
    return hash.finish();
};


ATNConfig.prototype.equalsForConfigSet = function(other) {
    if (this === other) {
        return true;
    } else if (! (other instanceof ATNConfig)) {
        return false;
    } else {
        return this.state.stateNumber===other.state.stateNumber &&
            this.alt===other.alt &&
            this.semanticContext.equals(other.semanticContext);
    }
};


ATNConfig.prototype.toString = function() {
    return "(" + this.state + "," + this.alt +
        (this.context!==null ? ",[" + this.context.toString() + "]" : "") +
        (this.semanticContext !== SemanticContext.NONE ?
                ("," + this.semanticContext.toString())
                : "") +
        (this.reachesIntoOuterContext>0 ?
                (",up=" + this.reachesIntoOuterContext)
                : "") + ")";
};


function LexerATNConfig(params, config) {
	ATNConfig.call(this, params, config);

    // This is the backing field for {@link //getLexerActionExecutor}.
	var lexerActionExecutor = params.lexerActionExecutor || null;
    this.lexerActionExecutor = lexerActionExecutor || (config!==null ? config.lexerActionExecutor : null);
    this.passedThroughNonGreedyDecision = config!==null ? this.checkNonGreedyDecision(config, this.state) : false;
    return this;
}

LexerATNConfig.prototype = Object.create(ATNConfig.prototype);
LexerATNConfig.prototype.constructor = LexerATNConfig;

LexerATNConfig.prototype.updateHashCode = function(hash) {
    hash.update(this.state.stateNumber, this.alt, this.context, this.semanticContext, this.passedThroughNonGreedyDecision, this.lexerActionExecutor);
};

LexerATNConfig.prototype.equals = function(other) {
    return this === other ||
            (other instanceof LexerATNConfig &&
            this.passedThroughNonGreedyDecision == other.passedThroughNonGreedyDecision &&
            (this.lexerActionExecutor ? this.lexerActionExecutor.equals(other.lexerActionExecutor) : !other.lexerActionExecutor) &&
            ATNConfig.prototype.equals.call(this, other));
};

LexerATNConfig.prototype.hashCodeForConfigSet = LexerATNConfig.prototype.hashCode;

LexerATNConfig.prototype.equalsForConfigSet = LexerATNConfig.prototype.equals;


LexerATNConfig.prototype.checkNonGreedyDecision = function(source, target) {
    return source.passedThroughNonGreedyDecision ||
        (target instanceof DecisionState) && target.nonGreedy;
};

exports.ATNConfig = ATNConfig;
exports.LexerATNConfig = LexerATNConfig;

/***/ }),

/***/ "./node_modules/antlr4/atn/ATNConfigSet.js":
/*!*************************************************!*\
  !*** ./node_modules/antlr4/atn/ATNConfigSet.js ***!
  \*************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

//
// Specialized {@link Set}{@code <}{@link ATNConfig}{@code >} that can track
// info about the set, with support for combining similar configurations using a
// graph-structured stack.
///

var ATN = __webpack_require__(/*! ./ATN */ "./node_modules/antlr4/atn/ATN.js").ATN;
var Utils = __webpack_require__(/*! ./../Utils */ "./node_modules/antlr4/Utils.js");
var Hash = Utils.Hash;
var Set = Utils.Set;
var SemanticContext = __webpack_require__(/*! ./SemanticContext */ "./node_modules/antlr4/atn/SemanticContext.js").SemanticContext;
var merge = __webpack_require__(/*! ./../PredictionContext */ "./node_modules/antlr4/PredictionContext.js").merge;

function hashATNConfig(c) {
	return c.hashCodeForConfigSet();
}

function equalATNConfigs(a, b) {
	if ( a===b ) {
		return true;
	} else if ( a===null || b===null ) {
		return false;
	} else
       return a.equalsForConfigSet(b);
 }


function ATNConfigSet(fullCtx) {
	//
	// The reason that we need this is because we don't want the hash map to use
	// the standard hash code and equals. We need all configurations with the
	// same
	// {@code (s,i,_,semctx)} to be equal. Unfortunately, this key effectively
	// doubles
	// the number of objects associated with ATNConfigs. The other solution is
	// to
	// use a hash table that lets us specify the equals/hashcode operation.
	// All configs but hashed by (s, i, _, pi) not including context. Wiped out
	// when we go readonly as this set becomes a DFA state.
	this.configLookup = new Set(hashATNConfig, equalATNConfigs);
	// Indicates that this configuration set is part of a full context
	// LL prediction. It will be used to determine how to merge $. With SLL
	// it's a wildcard whereas it is not for LL context merge.
	this.fullCtx = fullCtx === undefined ? true : fullCtx;
	// Indicates that the set of configurations is read-only. Do not
	// allow any code to manipulate the set; DFA states will point at
	// the sets and they must not change. This does not protect the other
	// fields; in particular, conflictingAlts is set after
	// we've made this readonly.
	this.readOnly = false;
	// Track the elements as they are added to the set; supports get(i)///
	this.configs = [];

	// TODO: these fields make me pretty uncomfortable but nice to pack up info
	// together, saves recomputation
	// TODO: can we track conflicts as they are added to save scanning configs
	// later?
	this.uniqueAlt = 0;
	this.conflictingAlts = null;

	// Used in parser and lexer. In lexer, it indicates we hit a pred
	// while computing a closure operation. Don't make a DFA state from this.
	this.hasSemanticContext = false;
	this.dipsIntoOuterContext = false;

	this.cachedHashCode = -1;

	return this;
}

// Adding a new config means merging contexts with existing configs for
// {@code (s, i, pi, _)}, where {@code s} is the
// {@link ATNConfig//state}, {@code i} is the {@link ATNConfig//alt}, and
// {@code pi} is the {@link ATNConfig//semanticContext}. We use
// {@code (s,i,pi)} as key.
//
// <p>This method updates {@link //dipsIntoOuterContext} and
// {@link //hasSemanticContext} when necessary.</p>
// /
ATNConfigSet.prototype.add = function(config, mergeCache) {
	if (mergeCache === undefined) {
		mergeCache = null;
	}
	if (this.readOnly) {
		throw "This set is readonly";
	}
	if (config.semanticContext !== SemanticContext.NONE) {
		this.hasSemanticContext = true;
	}
	if (config.reachesIntoOuterContext > 0) {
		this.dipsIntoOuterContext = true;
	}
	var existing = this.configLookup.add(config);
	if (existing === config) {
		this.cachedHashCode = -1;
		this.configs.push(config); // track order here
		return true;
	}
	// a previous (s,i,pi,_), merge with it and save result
	var rootIsWildcard = !this.fullCtx;
	var merged = merge(existing.context, config.context, rootIsWildcard, mergeCache);
	// no need to check for existing.context, config.context in cache
	// since only way to create new graphs is "call rule" and here. We
	// cache at both places.
	existing.reachesIntoOuterContext = Math.max( existing.reachesIntoOuterContext, config.reachesIntoOuterContext);
	// make sure to preserve the precedence filter suppression during the merge
	if (config.precedenceFilterSuppressed) {
		existing.precedenceFilterSuppressed = true;
	}
	existing.context = merged; // replace context; no need to alt mapping
	return true;
};

ATNConfigSet.prototype.getStates = function() {
	var states = new Set();
	for (var i = 0; i < this.configs.length; i++) {
		states.add(this.configs[i].state);
	}
	return states;
};

ATNConfigSet.prototype.getPredicates = function() {
	var preds = [];
	for (var i = 0; i < this.configs.length; i++) {
		var c = this.configs[i].semanticContext;
		if (c !== SemanticContext.NONE) {
			preds.push(c.semanticContext);
		}
	}
	return preds;
};

Object.defineProperty(ATNConfigSet.prototype, "items", {
	get : function() {
		return this.configs;
	}
});

ATNConfigSet.prototype.optimizeConfigs = function(interpreter) {
	if (this.readOnly) {
		throw "This set is readonly";
	}
	if (this.configLookup.length === 0) {
		return;
	}
	for (var i = 0; i < this.configs.length; i++) {
		var config = this.configs[i];
		config.context = interpreter.getCachedContext(config.context);
	}
};

ATNConfigSet.prototype.addAll = function(coll) {
	for (var i = 0; i < coll.length; i++) {
		this.add(coll[i]);
	}
	return false;
};

ATNConfigSet.prototype.equals = function(other) {
	return this === other ||
		(other instanceof ATNConfigSet &&
		Utils.equalArrays(this.configs, other.configs) &&
		this.fullCtx === other.fullCtx &&
		this.uniqueAlt === other.uniqueAlt &&
		this.conflictingAlts === other.conflictingAlts &&
		this.hasSemanticContext === other.hasSemanticContext &&
		this.dipsIntoOuterContext === other.dipsIntoOuterContext);
};

ATNConfigSet.prototype.hashCode = function() {
    var hash = new Hash();
	hash.update(this.configs);
    return hash.finish();
};


ATNConfigSet.prototype.updateHashCode = function(hash) {
	if (this.readOnly) {
		if (this.cachedHashCode === -1) {
            this.cachedHashCode = this.hashCode();
		}
        hash.update(this.cachedHashCode);
	} else {
        hash.update(this.hashCode());
	}
};


Object.defineProperty(ATNConfigSet.prototype, "length", {
	get : function() {
		return this.configs.length;
	}
});

ATNConfigSet.prototype.isEmpty = function() {
	return this.configs.length === 0;
};

ATNConfigSet.prototype.contains = function(item) {
	if (this.configLookup === null) {
		throw "This method is not implemented for readonly sets.";
	}
	return this.configLookup.contains(item);
};

ATNConfigSet.prototype.containsFast = function(item) {
	if (this.configLookup === null) {
		throw "This method is not implemented for readonly sets.";
	}
	return this.configLookup.containsFast(item);
};

ATNConfigSet.prototype.clear = function() {
	if (this.readOnly) {
		throw "This set is readonly";
	}
	this.configs = [];
	this.cachedHashCode = -1;
	this.configLookup = new Set();
};

ATNConfigSet.prototype.setReadonly = function(readOnly) {
	this.readOnly = readOnly;
	if (readOnly) {
		this.configLookup = null; // can't mod, no need for lookup cache
	}
};

ATNConfigSet.prototype.toString = function() {
	return Utils.arrayToString(this.configs) +
		(this.hasSemanticContext ? ",hasSemanticContext=" + this.hasSemanticContext : "") +
		(this.uniqueAlt !== ATN.INVALID_ALT_NUMBER ? ",uniqueAlt=" + this.uniqueAlt : "") +
		(this.conflictingAlts !== null ? ",conflictingAlts=" + this.conflictingAlts : "") +
		(this.dipsIntoOuterContext ? ",dipsIntoOuterContext" : "");
};

function OrderedATNConfigSet() {
	ATNConfigSet.call(this);
	this.configLookup = new Set();
	return this;
}

OrderedATNConfigSet.prototype = Object.create(ATNConfigSet.prototype);
OrderedATNConfigSet.prototype.constructor = OrderedATNConfigSet;

exports.ATNConfigSet = ATNConfigSet;
exports.OrderedATNConfigSet = OrderedATNConfigSet;


/***/ }),

/***/ "./node_modules/antlr4/atn/ATNDeserializationOptions.js":
/*!**************************************************************!*\
  !*** ./node_modules/antlr4/atn/ATNDeserializationOptions.js ***!
  \**************************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

function ATNDeserializationOptions(copyFrom) {
	if(copyFrom===undefined) {
		copyFrom = null;
	}
	this.readOnly = false;
    this.verifyATN = copyFrom===null ? true : copyFrom.verifyATN;
    this.generateRuleBypassTransitions = copyFrom===null ? false : copyFrom.generateRuleBypassTransitions;

    return this;
}

ATNDeserializationOptions.defaultOptions = new ATNDeserializationOptions();
ATNDeserializationOptions.defaultOptions.readOnly = true;

//    def __setattr__(self, key, value):
//        if key!="readOnly" and self.readOnly:
//            raise Exception("The object is read only.")
//        super(type(self), self).__setattr__(key,value)

exports.ATNDeserializationOptions = ATNDeserializationOptions;


/***/ }),

/***/ "./node_modules/antlr4/atn/ATNDeserializer.js":
/*!****************************************************!*\
  !*** ./node_modules/antlr4/atn/ATNDeserializer.js ***!
  \****************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

var Token = __webpack_require__(/*! ./../Token */ "./node_modules/antlr4/Token.js").Token;
var ATN = __webpack_require__(/*! ./ATN */ "./node_modules/antlr4/atn/ATN.js").ATN;
var ATNType = __webpack_require__(/*! ./ATNType */ "./node_modules/antlr4/atn/ATNType.js").ATNType;
var ATNStates = __webpack_require__(/*! ./ATNState */ "./node_modules/antlr4/atn/ATNState.js");
var ATNState = ATNStates.ATNState;
var BasicState = ATNStates.BasicState;
var DecisionState = ATNStates.DecisionState;
var BlockStartState = ATNStates.BlockStartState;
var BlockEndState = ATNStates.BlockEndState;
var LoopEndState = ATNStates.LoopEndState;
var RuleStartState = ATNStates.RuleStartState;
var RuleStopState = ATNStates.RuleStopState;
var TokensStartState = ATNStates.TokensStartState;
var PlusLoopbackState = ATNStates.PlusLoopbackState;
var StarLoopbackState = ATNStates.StarLoopbackState;
var StarLoopEntryState = ATNStates.StarLoopEntryState;
var PlusBlockStartState = ATNStates.PlusBlockStartState;
var StarBlockStartState = ATNStates.StarBlockStartState;
var BasicBlockStartState = ATNStates.BasicBlockStartState;
var Transitions = __webpack_require__(/*! ./Transition */ "./node_modules/antlr4/atn/Transition.js");
var Transition = Transitions.Transition;
var AtomTransition = Transitions.AtomTransition;
var SetTransition = Transitions.SetTransition;
var NotSetTransition = Transitions.NotSetTransition;
var RuleTransition = Transitions.RuleTransition;
var RangeTransition = Transitions.RangeTransition;
var ActionTransition = Transitions.ActionTransition;
var EpsilonTransition = Transitions.EpsilonTransition;
var WildcardTransition = Transitions.WildcardTransition;
var PredicateTransition = Transitions.PredicateTransition;
var PrecedencePredicateTransition = Transitions.PrecedencePredicateTransition;
var IntervalSet = __webpack_require__(/*! ./../IntervalSet */ "./node_modules/antlr4/IntervalSet.js").IntervalSet;
var Interval = __webpack_require__(/*! ./../IntervalSet */ "./node_modules/antlr4/IntervalSet.js").Interval;
var ATNDeserializationOptions = __webpack_require__(/*! ./ATNDeserializationOptions */ "./node_modules/antlr4/atn/ATNDeserializationOptions.js").ATNDeserializationOptions;
var LexerActions = __webpack_require__(/*! ./LexerAction */ "./node_modules/antlr4/atn/LexerAction.js");
var LexerActionType = LexerActions.LexerActionType;
var LexerSkipAction = LexerActions.LexerSkipAction;
var LexerChannelAction = LexerActions.LexerChannelAction;
var LexerCustomAction = LexerActions.LexerCustomAction;
var LexerMoreAction = LexerActions.LexerMoreAction;
var LexerTypeAction = LexerActions.LexerTypeAction;
var LexerPushModeAction = LexerActions.LexerPushModeAction;
var LexerPopModeAction = LexerActions.LexerPopModeAction;
var LexerModeAction = LexerActions.LexerModeAction;
// This is the earliest supported serialized UUID.
// stick to serialized version for now, we don't need a UUID instance
var BASE_SERIALIZED_UUID = "AADB8D7E-AEEF-4415-AD2B-8204D6CF042E";

//
// This UUID indicates the serialized ATN contains two sets of
// IntervalSets, where the second set's values are encoded as
// 32-bit integers to support the full Unicode SMP range up to U+10FFFF.
//
var ADDED_UNICODE_SMP = "59627784-3BE5-417A-B9EB-8131A7286089";

// This list contains all of the currently supported UUIDs, ordered by when
// the feature first appeared in this branch.
var SUPPORTED_UUIDS = [ BASE_SERIALIZED_UUID, ADDED_UNICODE_SMP ];

var SERIALIZED_VERSION = 3;

// This is the current serialized UUID.
var SERIALIZED_UUID = ADDED_UNICODE_SMP;

function initArray( length, value) {
	var tmp = [];
	tmp[length-1] = value;
	return tmp.map(function(i) {return value;});
}

function ATNDeserializer (options) {

    if ( options=== undefined || options === null ) {
        options = ATNDeserializationOptions.defaultOptions;
    }
    this.deserializationOptions = options;
    this.stateFactories = null;
    this.actionFactories = null;

    return this;
}

// Determines if a particular serialized representation of an ATN supports
// a particular feature, identified by the {@link UUID} used for serializing
// the ATN at the time the feature was first introduced.
//
// @param feature The {@link UUID} marking the first time the feature was
// supported in the serialized ATN.
// @param actualUuid The {@link UUID} of the actual serialized ATN which is
// currently being deserialized.
// @return {@code true} if the {@code actualUuid} value represents a
// serialized ATN at or after the feature identified by {@code feature} was
// introduced; otherwise, {@code false}.

ATNDeserializer.prototype.isFeatureSupported = function(feature, actualUuid) {
    var idx1 = SUPPORTED_UUIDS.indexOf(feature);
    if (idx1<0) {
        return false;
    }
    var idx2 = SUPPORTED_UUIDS.indexOf(actualUuid);
    return idx2 >= idx1;
};

ATNDeserializer.prototype.deserialize = function(data) {
    this.reset(data);
    this.checkVersion();
    this.checkUUID();
    var atn = this.readATN();
    this.readStates(atn);
    this.readRules(atn);
    this.readModes(atn);
    var sets = [];
    // First, deserialize sets with 16-bit arguments <= U+FFFF.
    this.readSets(atn, sets, this.readInt.bind(this));
    // Next, if the ATN was serialized with the Unicode SMP feature,
    // deserialize sets with 32-bit arguments <= U+10FFFF.
    if (this.isFeatureSupported(ADDED_UNICODE_SMP, this.uuid)) {
        this.readSets(atn, sets, this.readInt32.bind(this));
    }
    this.readEdges(atn, sets);
    this.readDecisions(atn);
    this.readLexerActions(atn);
    this.markPrecedenceDecisions(atn);
    this.verifyATN(atn);
    if (this.deserializationOptions.generateRuleBypassTransitions && atn.grammarType === ATNType.PARSER ) {
        this.generateRuleBypassTransitions(atn);
        // re-verify after modification
        this.verifyATN(atn);
    }
    return atn;
};

ATNDeserializer.prototype.reset = function(data) {
	var adjust = function(c) {
        var v = c.charCodeAt(0);
        return v>1  ? v-2 : v + 65534;
	};
    var temp = data.split("").map(adjust);
    // don't adjust the first value since that's the version number
    temp[0] = data.charCodeAt(0);
    this.data = temp;
    this.pos = 0;
};

ATNDeserializer.prototype.checkVersion = function() {
    var version = this.readInt();
    if ( version !== SERIALIZED_VERSION ) {
        throw ("Could not deserialize ATN with version " + version + " (expected " + SERIALIZED_VERSION + ").");
    }
};

ATNDeserializer.prototype.checkUUID = function() {
    var uuid = this.readUUID();
    if (SUPPORTED_UUIDS.indexOf(uuid)<0) {
        throw ("Could not deserialize ATN with UUID: " + uuid +
                        " (expected " + SERIALIZED_UUID + " or a legacy UUID).", uuid, SERIALIZED_UUID);
    }
    this.uuid = uuid;
};

ATNDeserializer.prototype.readATN = function() {
    var grammarType = this.readInt();
    var maxTokenType = this.readInt();
    return new ATN(grammarType, maxTokenType);
};

ATNDeserializer.prototype.readStates = function(atn) {
	var j, pair, stateNumber;
    var loopBackStateNumbers = [];
    var endStateNumbers = [];
    var nstates = this.readInt();
    for(var i=0; i<nstates; i++) {
        var stype = this.readInt();
        // ignore bad type of states
        if (stype===ATNState.INVALID_TYPE) {
            atn.addState(null);
            continue;
        }
        var ruleIndex = this.readInt();
        if (ruleIndex === 0xFFFF) {
            ruleIndex = -1;
        }
        var s = this.stateFactory(stype, ruleIndex);
        if (stype === ATNState.LOOP_END) { // special case
            var loopBackStateNumber = this.readInt();
            loopBackStateNumbers.push([s, loopBackStateNumber]);
        } else if(s instanceof BlockStartState) {
            var endStateNumber = this.readInt();
            endStateNumbers.push([s, endStateNumber]);
        }
        atn.addState(s);
    }
    // delay the assignment of loop back and end states until we know all the
	// state instances have been initialized
    for (j=0; j<loopBackStateNumbers.length; j++) {
        pair = loopBackStateNumbers[j];
        pair[0].loopBackState = atn.states[pair[1]];
    }

    for (j=0; j<endStateNumbers.length; j++) {
        pair = endStateNumbers[j];
        pair[0].endState = atn.states[pair[1]];
    }

    var numNonGreedyStates = this.readInt();
    for (j=0; j<numNonGreedyStates; j++) {
        stateNumber = this.readInt();
        atn.states[stateNumber].nonGreedy = true;
    }

    var numPrecedenceStates = this.readInt();
    for (j=0; j<numPrecedenceStates; j++) {
        stateNumber = this.readInt();
        atn.states[stateNumber].isPrecedenceRule = true;
    }
};

ATNDeserializer.prototype.readRules = function(atn) {
    var i;
    var nrules = this.readInt();
    if (atn.grammarType === ATNType.LEXER ) {
        atn.ruleToTokenType = initArray(nrules, 0);
    }
    atn.ruleToStartState = initArray(nrules, 0);
    for (i=0; i<nrules; i++) {
        var s = this.readInt();
        var startState = atn.states[s];
        atn.ruleToStartState[i] = startState;
        if ( atn.grammarType === ATNType.LEXER ) {
            var tokenType = this.readInt();
            if (tokenType === 0xFFFF) {
                tokenType = Token.EOF;
            }
            atn.ruleToTokenType[i] = tokenType;
        }
    }
    atn.ruleToStopState = initArray(nrules, 0);
    for (i=0; i<atn.states.length; i++) {
        var state = atn.states[i];
        if (!(state instanceof RuleStopState)) {
            continue;
        }
        atn.ruleToStopState[state.ruleIndex] = state;
        atn.ruleToStartState[state.ruleIndex].stopState = state;
    }
};

ATNDeserializer.prototype.readModes = function(atn) {
    var nmodes = this.readInt();
    for (var i=0; i<nmodes; i++) {
        var s = this.readInt();
        atn.modeToStartState.push(atn.states[s]);
    }
};

ATNDeserializer.prototype.readSets = function(atn, sets, readUnicode) {
    var m = this.readInt();
    for (var i=0; i<m; i++) {
        var iset = new IntervalSet();
        sets.push(iset);
        var n = this.readInt();
        var containsEof = this.readInt();
        if (containsEof!==0) {
            iset.addOne(-1);
        }
        for (var j=0; j<n; j++) {
            var i1 = readUnicode();
            var i2 = readUnicode();
            iset.addRange(i1, i2);
        }
    }
};

ATNDeserializer.prototype.readEdges = function(atn, sets) {
	var i, j, state, trans, target;
    var nedges = this.readInt();
    for (i=0; i<nedges; i++) {
        var src = this.readInt();
        var trg = this.readInt();
        var ttype = this.readInt();
        var arg1 = this.readInt();
        var arg2 = this.readInt();
        var arg3 = this.readInt();
        trans = this.edgeFactory(atn, ttype, src, trg, arg1, arg2, arg3, sets);
        var srcState = atn.states[src];
        srcState.addTransition(trans);
    }
    // edges for rule stop states can be derived, so they aren't serialized
    for (i=0; i<atn.states.length; i++) {
        state = atn.states[i];
        for (j=0; j<state.transitions.length; j++) {
            var t = state.transitions[j];
            if (!(t instanceof RuleTransition)) {
                continue;
            }
			var outermostPrecedenceReturn = -1;
			if (atn.ruleToStartState[t.target.ruleIndex].isPrecedenceRule) {
				if (t.precedence === 0) {
					outermostPrecedenceReturn = t.target.ruleIndex;
				}
			}

			trans = new EpsilonTransition(t.followState, outermostPrecedenceReturn);
            atn.ruleToStopState[t.target.ruleIndex].addTransition(trans);
        }
    }

    for (i=0; i<atn.states.length; i++) {
        state = atn.states[i];
        if (state instanceof BlockStartState) {
            // we need to know the end state to set its start state
            if (state.endState === null) {
                throw ("IllegalState");
            }
            // block end states can only be associated to a single block start
			// state
            if ( state.endState.startState !== null) {
                throw ("IllegalState");
            }
            state.endState.startState = state;
        }
        if (state instanceof PlusLoopbackState) {
            for (j=0; j<state.transitions.length; j++) {
                target = state.transitions[j].target;
                if (target instanceof PlusBlockStartState) {
                    target.loopBackState = state;
                }
            }
        } else if (state instanceof StarLoopbackState) {
            for (j=0; j<state.transitions.length; j++) {
                target = state.transitions[j].target;
                if (target instanceof StarLoopEntryState) {
                    target.loopBackState = state;
                }
            }
        }
    }
};

ATNDeserializer.prototype.readDecisions = function(atn) {
    var ndecisions = this.readInt();
    for (var i=0; i<ndecisions; i++) {
        var s = this.readInt();
        var decState = atn.states[s];
        atn.decisionToState.push(decState);
        decState.decision = i;
    }
};

ATNDeserializer.prototype.readLexerActions = function(atn) {
    if (atn.grammarType === ATNType.LEXER) {
        var count = this.readInt();
        atn.lexerActions = initArray(count, null);
        for (var i=0; i<count; i++) {
            var actionType = this.readInt();
            var data1 = this.readInt();
            if (data1 === 0xFFFF) {
                data1 = -1;
            }
            var data2 = this.readInt();
            if (data2 === 0xFFFF) {
                data2 = -1;
            }
            var lexerAction = this.lexerActionFactory(actionType, data1, data2);
            atn.lexerActions[i] = lexerAction;
        }
    }
};

ATNDeserializer.prototype.generateRuleBypassTransitions = function(atn) {
	var i;
    var count = atn.ruleToStartState.length;
    for(i=0; i<count; i++) {
        atn.ruleToTokenType[i] = atn.maxTokenType + i + 1;
    }
    for(i=0; i<count; i++) {
        this.generateRuleBypassTransition(atn, i);
    }
};

ATNDeserializer.prototype.generateRuleBypassTransition = function(atn, idx) {
	var i, state;
    var bypassStart = new BasicBlockStartState();
    bypassStart.ruleIndex = idx;
    atn.addState(bypassStart);

    var bypassStop = new BlockEndState();
    bypassStop.ruleIndex = idx;
    atn.addState(bypassStop);

    bypassStart.endState = bypassStop;
    atn.defineDecisionState(bypassStart);

    bypassStop.startState = bypassStart;

    var excludeTransition = null;
    var endState = null;

    if (atn.ruleToStartState[idx].isPrecedenceRule) {
        // wrap from the beginning of the rule to the StarLoopEntryState
        endState = null;
        for(i=0; i<atn.states.length; i++) {
            state = atn.states[i];
            if (this.stateIsEndStateFor(state, idx)) {
                endState = state;
                excludeTransition = state.loopBackState.transitions[0];
                break;
            }
        }
        if (excludeTransition === null) {
            throw ("Couldn't identify final state of the precedence rule prefix section.");
        }
    } else {
        endState = atn.ruleToStopState[idx];
    }

    // all non-excluded transitions that currently target end state need to
	// target blockEnd instead
    for(i=0; i<atn.states.length; i++) {
        state = atn.states[i];
        for(var j=0; j<state.transitions.length; j++) {
            var transition = state.transitions[j];
            if (transition === excludeTransition) {
                continue;
            }
            if (transition.target === endState) {
                transition.target = bypassStop;
            }
        }
    }

    // all transitions leaving the rule start state need to leave blockStart
	// instead
    var ruleToStartState = atn.ruleToStartState[idx];
    var count = ruleToStartState.transitions.length;
    while ( count > 0) {
        bypassStart.addTransition(ruleToStartState.transitions[count-1]);
        ruleToStartState.transitions = ruleToStartState.transitions.slice(-1);
    }
    // link the new states
    atn.ruleToStartState[idx].addTransition(new EpsilonTransition(bypassStart));
    bypassStop.addTransition(new EpsilonTransition(endState));

    var matchState = new BasicState();
    atn.addState(matchState);
    matchState.addTransition(new AtomTransition(bypassStop, atn.ruleToTokenType[idx]));
    bypassStart.addTransition(new EpsilonTransition(matchState));
};

ATNDeserializer.prototype.stateIsEndStateFor = function(state, idx) {
    if ( state.ruleIndex !== idx) {
        return null;
    }
    if (!( state instanceof StarLoopEntryState)) {
        return null;
    }
    var maybeLoopEndState = state.transitions[state.transitions.length - 1].target;
    if (!( maybeLoopEndState instanceof LoopEndState)) {
        return null;
    }
    if (maybeLoopEndState.epsilonOnlyTransitions &&
        (maybeLoopEndState.transitions[0].target instanceof RuleStopState)) {
        return state;
    } else {
        return null;
    }
};

//
// Analyze the {@link StarLoopEntryState} states in the specified ATN to set
// the {@link StarLoopEntryState//isPrecedenceDecision} field to the
// correct value.
//
// @param atn The ATN.
//
ATNDeserializer.prototype.markPrecedenceDecisions = function(atn) {
	for(var i=0; i<atn.states.length; i++) {
		var state = atn.states[i];
		if (!( state instanceof StarLoopEntryState)) {
            continue;
        }
        // We analyze the ATN to determine if this ATN decision state is the
        // decision for the closure block that determines whether a
        // precedence rule should continue or complete.
        //
        if ( atn.ruleToStartState[state.ruleIndex].isPrecedenceRule) {
            var maybeLoopEndState = state.transitions[state.transitions.length - 1].target;
            if (maybeLoopEndState instanceof LoopEndState) {
                if ( maybeLoopEndState.epsilonOnlyTransitions &&
                        (maybeLoopEndState.transitions[0].target instanceof RuleStopState)) {
                    state.isPrecedenceDecision = true;
                }
            }
        }
	}
};

ATNDeserializer.prototype.verifyATN = function(atn) {
    if (!this.deserializationOptions.verifyATN) {
        return;
    }
    // verify assumptions
	for(var i=0; i<atn.states.length; i++) {
        var state = atn.states[i];
        if (state === null) {
            continue;
        }
        this.checkCondition(state.epsilonOnlyTransitions || state.transitions.length <= 1);
        if (state instanceof PlusBlockStartState) {
            this.checkCondition(state.loopBackState !== null);
        } else  if (state instanceof StarLoopEntryState) {
            this.checkCondition(state.loopBackState !== null);
            this.checkCondition(state.transitions.length === 2);
            if (state.transitions[0].target instanceof StarBlockStartState) {
                this.checkCondition(state.transitions[1].target instanceof LoopEndState);
                this.checkCondition(!state.nonGreedy);
            } else if (state.transitions[0].target instanceof LoopEndState) {
                this.checkCondition(state.transitions[1].target instanceof StarBlockStartState);
                this.checkCondition(state.nonGreedy);
            } else {
                throw("IllegalState");
            }
        } else if (state instanceof StarLoopbackState) {
            this.checkCondition(state.transitions.length === 1);
            this.checkCondition(state.transitions[0].target instanceof StarLoopEntryState);
        } else if (state instanceof LoopEndState) {
            this.checkCondition(state.loopBackState !== null);
        } else if (state instanceof RuleStartState) {
            this.checkCondition(state.stopState !== null);
        } else if (state instanceof BlockStartState) {
            this.checkCondition(state.endState !== null);
        } else if (state instanceof BlockEndState) {
            this.checkCondition(state.startState !== null);
        } else if (state instanceof DecisionState) {
            this.checkCondition(state.transitions.length <= 1 || state.decision >= 0);
        } else {
            this.checkCondition(state.transitions.length <= 1 || (state instanceof RuleStopState));
        }
	}
};

ATNDeserializer.prototype.checkCondition = function(condition, message) {
    if (!condition) {
        if (message === undefined || message===null) {
            message = "IllegalState";
        }
        throw (message);
    }
};

ATNDeserializer.prototype.readInt = function() {
    return this.data[this.pos++];
};

ATNDeserializer.prototype.readInt32 = function() {
    var low = this.readInt();
    var high = this.readInt();
    return low | (high << 16);
};

ATNDeserializer.prototype.readLong = function() {
    var low = this.readInt32();
    var high = this.readInt32();
    return (low & 0x00000000FFFFFFFF) | (high << 32);
};

function createByteToHex() {
	var bth = [];
	for (var i = 0; i < 256; i++) {
		bth[i] = (i + 0x100).toString(16).substr(1).toUpperCase();
	}
	return bth;
}

var byteToHex = createByteToHex();

ATNDeserializer.prototype.readUUID = function() {
	var bb = [];
	for(var i=7;i>=0;i--) {
		var int = this.readInt();
		/* jshint bitwise: false */
		bb[(2*i)+1] = int & 0xFF;
		bb[2*i] = (int >> 8) & 0xFF;
	}
    return byteToHex[bb[0]] + byteToHex[bb[1]] +
    byteToHex[bb[2]] + byteToHex[bb[3]] + '-' +
    byteToHex[bb[4]] + byteToHex[bb[5]] + '-' +
    byteToHex[bb[6]] + byteToHex[bb[7]] + '-' +
    byteToHex[bb[8]] + byteToHex[bb[9]] + '-' +
    byteToHex[bb[10]] + byteToHex[bb[11]] +
    byteToHex[bb[12]] + byteToHex[bb[13]] +
    byteToHex[bb[14]] + byteToHex[bb[15]];
};

ATNDeserializer.prototype.edgeFactory = function(atn, type, src, trg, arg1, arg2, arg3, sets) {
    var target = atn.states[trg];
    switch(type) {
    case Transition.EPSILON:
        return new EpsilonTransition(target);
    case Transition.RANGE:
        return arg3 !== 0 ? new RangeTransition(target, Token.EOF, arg2) : new RangeTransition(target, arg1, arg2);
    case Transition.RULE:
        return new RuleTransition(atn.states[arg1], arg2, arg3, target);
    case Transition.PREDICATE:
        return new PredicateTransition(target, arg1, arg2, arg3 !== 0);
    case Transition.PRECEDENCE:
        return new PrecedencePredicateTransition(target, arg1);
    case Transition.ATOM:
        return arg3 !== 0 ? new AtomTransition(target, Token.EOF) : new AtomTransition(target, arg1);
    case Transition.ACTION:
        return new ActionTransition(target, arg1, arg2, arg3 !== 0);
    case Transition.SET:
        return new SetTransition(target, sets[arg1]);
    case Transition.NOT_SET:
        return new NotSetTransition(target, sets[arg1]);
    case Transition.WILDCARD:
        return new WildcardTransition(target);
    default:
        throw "The specified transition type: " + type + " is not valid.";
    }
};

ATNDeserializer.prototype.stateFactory = function(type, ruleIndex) {
    if (this.stateFactories === null) {
        var sf = [];
        sf[ATNState.INVALID_TYPE] = null;
        sf[ATNState.BASIC] = function() { return new BasicState(); };
        sf[ATNState.RULE_START] = function() { return new RuleStartState(); };
        sf[ATNState.BLOCK_START] = function() { return new BasicBlockStartState(); };
        sf[ATNState.PLUS_BLOCK_START] = function() { return new PlusBlockStartState(); };
        sf[ATNState.STAR_BLOCK_START] = function() { return new StarBlockStartState(); };
        sf[ATNState.TOKEN_START] = function() { return new TokensStartState(); };
        sf[ATNState.RULE_STOP] = function() { return new RuleStopState(); };
        sf[ATNState.BLOCK_END] = function() { return new BlockEndState(); };
        sf[ATNState.STAR_LOOP_BACK] = function() { return new StarLoopbackState(); };
        sf[ATNState.STAR_LOOP_ENTRY] = function() { return new StarLoopEntryState(); };
        sf[ATNState.PLUS_LOOP_BACK] = function() { return new PlusLoopbackState(); };
        sf[ATNState.LOOP_END] = function() { return new LoopEndState(); };
        this.stateFactories = sf;
    }
    if (type>this.stateFactories.length || this.stateFactories[type] === null) {
        throw("The specified state type " + type + " is not valid.");
    } else {
        var s = this.stateFactories[type]();
        if (s!==null) {
            s.ruleIndex = ruleIndex;
            return s;
        }
    }
};

ATNDeserializer.prototype.lexerActionFactory = function(type, data1, data2) {
    if (this.actionFactories === null) {
        var af = [];
        af[LexerActionType.CHANNEL] = function(data1, data2) { return new LexerChannelAction(data1); };
        af[LexerActionType.CUSTOM] = function(data1, data2) { return new LexerCustomAction(data1, data2); };
        af[LexerActionType.MODE] = function(data1, data2) { return new LexerModeAction(data1); };
        af[LexerActionType.MORE] = function(data1, data2) { return LexerMoreAction.INSTANCE; };
        af[LexerActionType.POP_MODE] = function(data1, data2) { return LexerPopModeAction.INSTANCE; };
        af[LexerActionType.PUSH_MODE] = function(data1, data2) { return new LexerPushModeAction(data1); };
        af[LexerActionType.SKIP] = function(data1, data2) { return LexerSkipAction.INSTANCE; };
        af[LexerActionType.TYPE] = function(data1, data2) { return new LexerTypeAction(data1); };
        this.actionFactories = af;
    }
    if (type>this.actionFactories.length || this.actionFactories[type] === null) {
        throw("The specified lexer action type " + type + " is not valid.");
    } else {
        return this.actionFactories[type](data1, data2);
    }
};


exports.ATNDeserializer = ATNDeserializer;

/***/ }),

/***/ "./node_modules/antlr4/atn/ATNSimulator.js":
/*!*************************************************!*\
  !*** ./node_modules/antlr4/atn/ATNSimulator.js ***!
  \*************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
///

var DFAState = __webpack_require__(/*! ./../dfa/DFAState */ "./node_modules/antlr4/dfa/DFAState.js").DFAState;
var ATNConfigSet = __webpack_require__(/*! ./ATNConfigSet */ "./node_modules/antlr4/atn/ATNConfigSet.js").ATNConfigSet;
var getCachedPredictionContext = __webpack_require__(/*! ./../PredictionContext */ "./node_modules/antlr4/PredictionContext.js").getCachedPredictionContext;
var Map = __webpack_require__(/*! ./../Utils */ "./node_modules/antlr4/Utils.js").Map;

function ATNSimulator(atn, sharedContextCache) {

    // The context cache maps all PredictionContext objects that are ==
    //  to a single cached copy. This cache is shared across all contexts
    //  in all ATNConfigs in all DFA states.  We rebuild each ATNConfigSet
    //  to use only cached nodes/graphs in addDFAState(). We don't want to
    //  fill this during closure() since there are lots of contexts that
    //  pop up but are not used ever again. It also greatly slows down closure().
    //
    //  <p>This cache makes a huge difference in memory and a little bit in speed.
    //  For the Java grammar on java.*, it dropped the memory requirements
    //  at the end from 25M to 16M. We don't store any of the full context
    //  graphs in the DFA because they are limited to local context only,
    //  but apparently there's a lot of repetition there as well. We optimize
    //  the config contexts before storing the config set in the DFA states
    //  by literally rebuilding them with cached subgraphs only.</p>
    //
    //  <p>I tried a cache for use during closure operations, that was
    //  whacked after each adaptivePredict(). It cost a little bit
    //  more time I think and doesn't save on the overall footprint
    //  so it's not worth the complexity.</p>
    ///
    this.atn = atn;
    this.sharedContextCache = sharedContextCache;
    return this;
}

// Must distinguish between missing edge and edge we know leads nowhere///
ATNSimulator.ERROR = new DFAState(0x7FFFFFFF, new ATNConfigSet());


ATNSimulator.prototype.getCachedContext = function(context) {
    if (this.sharedContextCache ===null) {
        return context;
    }
    var visited = new Map();
    return getCachedPredictionContext(context, this.sharedContextCache, visited);
};

exports.ATNSimulator = ATNSimulator;


/***/ }),

/***/ "./node_modules/antlr4/atn/ATNState.js":
/*!*********************************************!*\
  !*** ./node_modules/antlr4/atn/ATNState.js ***!
  \*********************************************/
/*! no static exports found */
/***/ (function(module, exports) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
//

// The following images show the relation of states and
// {@link ATNState//transitions} for various grammar constructs.
//
// <ul>
//
// <li>Solid edges marked with an &//0949; indicate a required
// {@link EpsilonTransition}.</li>
//
// <li>Dashed edges indicate locations where any transition derived from
// {@link Transition} might appear.</li>
//
// <li>Dashed nodes are place holders for either a sequence of linked
// {@link BasicState} states or the inclusion of a block representing a nested
// construct in one of the forms below.</li>
//
// <li>Nodes showing multiple outgoing alternatives with a {@code ...} support
// any number of alternatives (one or more). Nodes without the {@code ...} only
// support the exact number of alternatives shown in the diagram.</li>
//
// </ul>
//
// <h2>Basic Blocks</h2>
//
// <h3>Rule</h3>
//
// <embed src="images/Rule.svg" type="image/svg+xml"/>
//
// <h3>Block of 1 or more alternatives</h3>
//
// <embed src="images/Block.svg" type="image/svg+xml"/>
//
// <h2>Greedy Loops</h2>
//
// <h3>Greedy Closure: {@code (...)*}</h3>
//
// <embed src="images/ClosureGreedy.svg" type="image/svg+xml"/>
//
// <h3>Greedy Positive Closure: {@code (...)+}</h3>
//
// <embed src="images/PositiveClosureGreedy.svg" type="image/svg+xml"/>
//
// <h3>Greedy Optional: {@code (...)?}</h3>
//
// <embed src="images/OptionalGreedy.svg" type="image/svg+xml"/>
//
// <h2>Non-Greedy Loops</h2>
//
// <h3>Non-Greedy Closure: {@code (...)*?}</h3>
//
// <embed src="images/ClosureNonGreedy.svg" type="image/svg+xml"/>
//
// <h3>Non-Greedy Positive Closure: {@code (...)+?}</h3>
//
// <embed src="images/PositiveClosureNonGreedy.svg" type="image/svg+xml"/>
//
// <h3>Non-Greedy Optional: {@code (...)??}</h3>
//
// <embed src="images/OptionalNonGreedy.svg" type="image/svg+xml"/>
//

var INITIAL_NUM_TRANSITIONS = 4;

function ATNState() {
    // Which ATN are we in?
    this.atn = null;
    this.stateNumber = ATNState.INVALID_STATE_NUMBER;
    this.stateType = null;
    this.ruleIndex = 0; // at runtime, we don't have Rule objects
    this.epsilonOnlyTransitions = false;
    // Track the transitions emanating from this ATN state.
    this.transitions = [];
    // Used to cache lookahead during parsing, not used during construction
    this.nextTokenWithinRule = null;
    return this;
}

// constants for serialization
ATNState.INVALID_TYPE = 0;
ATNState.BASIC = 1;
ATNState.RULE_START = 2;
ATNState.BLOCK_START = 3;
ATNState.PLUS_BLOCK_START = 4;
ATNState.STAR_BLOCK_START = 5;
ATNState.TOKEN_START = 6;
ATNState.RULE_STOP = 7;
ATNState.BLOCK_END = 8;
ATNState.STAR_LOOP_BACK = 9;
ATNState.STAR_LOOP_ENTRY = 10;
ATNState.PLUS_LOOP_BACK = 11;
ATNState.LOOP_END = 12;

ATNState.serializationNames = [
            "INVALID",
            "BASIC",
            "RULE_START",
            "BLOCK_START",
            "PLUS_BLOCK_START",
            "STAR_BLOCK_START",
            "TOKEN_START",
            "RULE_STOP",
            "BLOCK_END",
            "STAR_LOOP_BACK",
            "STAR_LOOP_ENTRY",
            "PLUS_LOOP_BACK",
            "LOOP_END" ];

ATNState.INVALID_STATE_NUMBER = -1;

ATNState.prototype.toString = function() {
	return this.stateNumber;
};

ATNState.prototype.equals = function(other) {
    if (other instanceof ATNState) {
        return this.stateNumber===other.stateNumber;
    } else {
        return false;
    }
};

ATNState.prototype.isNonGreedyExitState = function() {
    return false;
};


ATNState.prototype.addTransition = function(trans, index) {
	if(index===undefined) {
		index = -1;
	}
    if (this.transitions.length===0) {
        this.epsilonOnlyTransitions = trans.isEpsilon;
    } else if(this.epsilonOnlyTransitions !== trans.isEpsilon) {
        this.epsilonOnlyTransitions = false;
    }
    if (index===-1) {
        this.transitions.push(trans);
    } else {
        this.transitions.splice(index, 1, trans);
    }
};

function BasicState() {
	ATNState.call(this);
    this.stateType = ATNState.BASIC;
    return this;
}

BasicState.prototype = Object.create(ATNState.prototype);
BasicState.prototype.constructor = BasicState;


function DecisionState() {
	ATNState.call(this);
    this.decision = -1;
    this.nonGreedy = false;
    return this;
}

DecisionState.prototype = Object.create(ATNState.prototype);
DecisionState.prototype.constructor = DecisionState;


//  The start of a regular {@code (...)} block.
function BlockStartState() {
	DecisionState.call(this);
	this.endState = null;
	return this;
}

BlockStartState.prototype = Object.create(DecisionState.prototype);
BlockStartState.prototype.constructor = BlockStartState;


function BasicBlockStartState() {
	BlockStartState.call(this);
	this.stateType = ATNState.BLOCK_START;
	return this;
}

BasicBlockStartState.prototype = Object.create(BlockStartState.prototype);
BasicBlockStartState.prototype.constructor = BasicBlockStartState;


// Terminal node of a simple {@code (a|b|c)} block.
function BlockEndState() {
	ATNState.call(this);
	this.stateType = ATNState.BLOCK_END;
    this.startState = null;
    return this;
}

BlockEndState.prototype = Object.create(ATNState.prototype);
BlockEndState.prototype.constructor = BlockEndState;


// The last node in the ATN for a rule, unless that rule is the start symbol.
//  In that case, there is one transition to EOF. Later, we might encode
//  references to all calls to this rule to compute FOLLOW sets for
//  error handling.
//
function RuleStopState() {
	ATNState.call(this);
    this.stateType = ATNState.RULE_STOP;
    return this;
}

RuleStopState.prototype = Object.create(ATNState.prototype);
RuleStopState.prototype.constructor = RuleStopState;

function RuleStartState() {
	ATNState.call(this);
	this.stateType = ATNState.RULE_START;
	this.stopState = null;
	this.isPrecedenceRule = false;
	return this;
}

RuleStartState.prototype = Object.create(ATNState.prototype);
RuleStartState.prototype.constructor = RuleStartState;

// Decision state for {@code A+} and {@code (A|B)+}.  It has two transitions:
//  one to the loop back to start of the block and one to exit.
//
function PlusLoopbackState() {
	DecisionState.call(this);
	this.stateType = ATNState.PLUS_LOOP_BACK;
	return this;
}

PlusLoopbackState.prototype = Object.create(DecisionState.prototype);
PlusLoopbackState.prototype.constructor = PlusLoopbackState;


// Start of {@code (A|B|...)+} loop. Technically a decision state, but
//  we don't use for code generation; somebody might need it, so I'm defining
//  it for completeness. In reality, the {@link PlusLoopbackState} node is the
//  real decision-making note for {@code A+}.
//
function PlusBlockStartState() {
	BlockStartState.call(this);
	this.stateType = ATNState.PLUS_BLOCK_START;
    this.loopBackState = null;
    return this;
}

PlusBlockStartState.prototype = Object.create(BlockStartState.prototype);
PlusBlockStartState.prototype.constructor = PlusBlockStartState;

// The block that begins a closure loop.
function StarBlockStartState() {
	BlockStartState.call(this);
	this.stateType = ATNState.STAR_BLOCK_START;
	return this;
}

StarBlockStartState.prototype = Object.create(BlockStartState.prototype);
StarBlockStartState.prototype.constructor = StarBlockStartState;


function StarLoopbackState() {
	ATNState.call(this);
	this.stateType = ATNState.STAR_LOOP_BACK;
	return this;
}

StarLoopbackState.prototype = Object.create(ATNState.prototype);
StarLoopbackState.prototype.constructor = StarLoopbackState;


function StarLoopEntryState() {
	DecisionState.call(this);
	this.stateType = ATNState.STAR_LOOP_ENTRY;
    this.loopBackState = null;
    // Indicates whether this state can benefit from a precedence DFA during SLL decision making.
    this.isPrecedenceDecision = null;
    return this;
}

StarLoopEntryState.prototype = Object.create(DecisionState.prototype);
StarLoopEntryState.prototype.constructor = StarLoopEntryState;


// Mark the end of a * or + loop.
function LoopEndState() {
	ATNState.call(this);
	this.stateType = ATNState.LOOP_END;
	this.loopBackState = null;
	return this;
}

LoopEndState.prototype = Object.create(ATNState.prototype);
LoopEndState.prototype.constructor = LoopEndState;


// The Tokens rule start state linking to each lexer rule start state */
function TokensStartState() {
	DecisionState.call(this);
	this.stateType = ATNState.TOKEN_START;
	return this;
}

TokensStartState.prototype = Object.create(DecisionState.prototype);
TokensStartState.prototype.constructor = TokensStartState;

exports.ATNState = ATNState;
exports.BasicState = BasicState;
exports.DecisionState = DecisionState;
exports.BlockStartState = BlockStartState;
exports.BlockEndState = BlockEndState;
exports.LoopEndState = LoopEndState;
exports.RuleStartState = RuleStartState;
exports.RuleStopState = RuleStopState;
exports.TokensStartState = TokensStartState;
exports.PlusLoopbackState = PlusLoopbackState;
exports.StarLoopbackState = StarLoopbackState;
exports.StarLoopEntryState = StarLoopEntryState;
exports.PlusBlockStartState = PlusBlockStartState;
exports.StarBlockStartState = StarBlockStartState;
exports.BasicBlockStartState = BasicBlockStartState;


/***/ }),

/***/ "./node_modules/antlr4/atn/ATNType.js":
/*!********************************************!*\
  !*** ./node_modules/antlr4/atn/ATNType.js ***!
  \********************************************/
/*! no static exports found */
/***/ (function(module, exports) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
///

// Represents the type of recognizer an ATN applies to.

function ATNType() {

}

ATNType.LEXER = 0;
ATNType.PARSER = 1;

exports.ATNType = ATNType;



/***/ }),

/***/ "./node_modules/antlr4/atn/LexerATNSimulator.js":
/*!******************************************************!*\
  !*** ./node_modules/antlr4/atn/LexerATNSimulator.js ***!
  \******************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
///

// When we hit an accept state in either the DFA or the ATN, we
//  have to notify the character stream to start buffering characters
//  via {@link IntStream//mark} and record the current state. The current sim state
//  includes the current index into the input, the current line,
//  and current character position in that line. Note that the Lexer is
//  tracking the starting line and characterization of the token. These
//  variables track the "state" of the simulator when it hits an accept state.
//
//  <p>We track these variables separately for the DFA and ATN simulation
//  because the DFA simulation often has to fail over to the ATN
//  simulation. If the ATN simulation fails, we need the DFA to fall
//  back to its previously accepted state, if any. If the ATN succeeds,
//  then the ATN does the accept and the DFA simulator that invoked it
//  can simply return the predicted token type.</p>
///

var Token = __webpack_require__(/*! ./../Token */ "./node_modules/antlr4/Token.js").Token;
var Lexer = __webpack_require__(/*! ./../Lexer */ "./node_modules/antlr4/Lexer.js").Lexer;
var ATN = __webpack_require__(/*! ./ATN */ "./node_modules/antlr4/atn/ATN.js").ATN;
var ATNSimulator = __webpack_require__(/*! ./ATNSimulator */ "./node_modules/antlr4/atn/ATNSimulator.js").ATNSimulator;
var DFAState = __webpack_require__(/*! ./../dfa/DFAState */ "./node_modules/antlr4/dfa/DFAState.js").DFAState;
var ATNConfigSet = __webpack_require__(/*! ./ATNConfigSet */ "./node_modules/antlr4/atn/ATNConfigSet.js").ATNConfigSet;
var OrderedATNConfigSet = __webpack_require__(/*! ./ATNConfigSet */ "./node_modules/antlr4/atn/ATNConfigSet.js").OrderedATNConfigSet;
var PredictionContext = __webpack_require__(/*! ./../PredictionContext */ "./node_modules/antlr4/PredictionContext.js").PredictionContext;
var SingletonPredictionContext = __webpack_require__(/*! ./../PredictionContext */ "./node_modules/antlr4/PredictionContext.js").SingletonPredictionContext;
var RuleStopState = __webpack_require__(/*! ./ATNState */ "./node_modules/antlr4/atn/ATNState.js").RuleStopState;
var LexerATNConfig = __webpack_require__(/*! ./ATNConfig */ "./node_modules/antlr4/atn/ATNConfig.js").LexerATNConfig;
var Transition = __webpack_require__(/*! ./Transition */ "./node_modules/antlr4/atn/Transition.js").Transition;
var LexerActionExecutor = __webpack_require__(/*! ./LexerActionExecutor */ "./node_modules/antlr4/atn/LexerActionExecutor.js").LexerActionExecutor;
var LexerNoViableAltException = __webpack_require__(/*! ./../error/Errors */ "./node_modules/antlr4/error/Errors.js").LexerNoViableAltException;

function resetSimState(sim) {
	sim.index = -1;
	sim.line = 0;
	sim.column = -1;
	sim.dfaState = null;
}

function SimState() {
	resetSimState(this);
	return this;
}

SimState.prototype.reset = function() {
	resetSimState(this);
};

function LexerATNSimulator(recog, atn, decisionToDFA, sharedContextCache) {
	ATNSimulator.call(this, atn, sharedContextCache);
	this.decisionToDFA = decisionToDFA;
	this.recog = recog;
	// The current token's starting index into the character stream.
	// Shared across DFA to ATN simulation in case the ATN fails and the
	// DFA did not have a previous accept state. In this case, we use the
	// ATN-generated exception object.
	this.startIndex = -1;
	// line number 1..n within the input///
	this.line = 1;
	// The index of the character relative to the beginning of the line
	// 0..n-1///
	this.column = 0;
	this.mode = Lexer.DEFAULT_MODE;
	// Used during DFA/ATN exec to record the most recent accept configuration
	// info
	this.prevAccept = new SimState();
	// done
	return this;
}

LexerATNSimulator.prototype = Object.create(ATNSimulator.prototype);
LexerATNSimulator.prototype.constructor = LexerATNSimulator;

LexerATNSimulator.debug = false;
LexerATNSimulator.dfa_debug = false;

LexerATNSimulator.MIN_DFA_EDGE = 0;
LexerATNSimulator.MAX_DFA_EDGE = 127; // forces unicode to stay in ATN

LexerATNSimulator.match_calls = 0;

LexerATNSimulator.prototype.copyState = function(simulator) {
	this.column = simulator.column;
	this.line = simulator.line;
	this.mode = simulator.mode;
	this.startIndex = simulator.startIndex;
};

LexerATNSimulator.prototype.match = function(input, mode) {
	this.match_calls += 1;
	this.mode = mode;
	var mark = input.mark();
	try {
		this.startIndex = input.index;
		this.prevAccept.reset();
		var dfa = this.decisionToDFA[mode];
		if (dfa.s0 === null) {
			return this.matchATN(input);
		} else {
			return this.execATN(input, dfa.s0);
		}
	} finally {
		input.release(mark);
	}
};

LexerATNSimulator.prototype.reset = function() {
	this.prevAccept.reset();
	this.startIndex = -1;
	this.line = 1;
	this.column = 0;
	this.mode = Lexer.DEFAULT_MODE;
};

LexerATNSimulator.prototype.matchATN = function(input) {
	var startState = this.atn.modeToStartState[this.mode];

	if (LexerATNSimulator.debug) {
		console.log("matchATN mode " + this.mode + " start: " + startState);
	}
	var old_mode = this.mode;
	var s0_closure = this.computeStartState(input, startState);
	var suppressEdge = s0_closure.hasSemanticContext;
	s0_closure.hasSemanticContext = false;

	var next = this.addDFAState(s0_closure);
	if (!suppressEdge) {
		this.decisionToDFA[this.mode].s0 = next;
	}

	var predict = this.execATN(input, next);

	if (LexerATNSimulator.debug) {
		console.log("DFA after matchATN: " + this.decisionToDFA[old_mode].toLexerString());
	}
	return predict;
};

LexerATNSimulator.prototype.execATN = function(input, ds0) {
	if (LexerATNSimulator.debug) {
		console.log("start state closure=" + ds0.configs);
	}
	if (ds0.isAcceptState) {
		// allow zero-length tokens
		this.captureSimState(this.prevAccept, input, ds0);
	}
	var t = input.LA(1);
	var s = ds0; // s is current/from DFA state

	while (true) { // while more work
		if (LexerATNSimulator.debug) {
			console.log("execATN loop starting closure: " + s.configs);
		}

		// As we move src->trg, src->trg, we keep track of the previous trg to
		// avoid looking up the DFA state again, which is expensive.
		// If the previous target was already part of the DFA, we might
		// be able to avoid doing a reach operation upon t. If s!=null,
		// it means that semantic predicates didn't prevent us from
		// creating a DFA state. Once we know s!=null, we check to see if
		// the DFA state has an edge already for t. If so, we can just reuse
		// it's configuration set; there's no point in re-computing it.
		// This is kind of like doing DFA simulation within the ATN
		// simulation because DFA simulation is really just a way to avoid
		// computing reach/closure sets. Technically, once we know that
		// we have a previously added DFA state, we could jump over to
		// the DFA simulator. But, that would mean popping back and forth
		// a lot and making things more complicated algorithmically.
		// This optimization makes a lot of sense for loops within DFA.
		// A character will take us back to an existing DFA state
		// that already has lots of edges out of it. e.g., .* in comments.
		// print("Target for:" + str(s) + " and:" + str(t))
		var target = this.getExistingTargetState(s, t);
		// print("Existing:" + str(target))
		if (target === null) {
			target = this.computeTargetState(input, s, t);
			// print("Computed:" + str(target))
		}
		if (target === ATNSimulator.ERROR) {
			break;
		}
		// If this is a consumable input element, make sure to consume before
		// capturing the accept state so the input index, line, and char
		// position accurately reflect the state of the interpreter at the
		// end of the token.
		if (t !== Token.EOF) {
			this.consume(input);
		}
		if (target.isAcceptState) {
			this.captureSimState(this.prevAccept, input, target);
			if (t === Token.EOF) {
				break;
			}
		}
		t = input.LA(1);
		s = target; // flip; current DFA target becomes new src/from state
	}
	return this.failOrAccept(this.prevAccept, input, s.configs, t);
};

// Get an existing target state for an edge in the DFA. If the target state
// for the edge has not yet been computed or is otherwise not available,
// this method returns {@code null}.
//
// @param s The current DFA state
// @param t The next input symbol
// @return The existing target DFA state for the given input symbol
// {@code t}, or {@code null} if the target state for this edge is not
// already cached
LexerATNSimulator.prototype.getExistingTargetState = function(s, t) {
	if (s.edges === null || t < LexerATNSimulator.MIN_DFA_EDGE || t > LexerATNSimulator.MAX_DFA_EDGE) {
		return null;
	}

	var target = s.edges[t - LexerATNSimulator.MIN_DFA_EDGE];
	if(target===undefined) {
		target = null;
	}
	if (LexerATNSimulator.debug && target !== null) {
		console.log("reuse state " + s.stateNumber + " edge to " + target.stateNumber);
	}
	return target;
};

// Compute a target state for an edge in the DFA, and attempt to add the
// computed state and corresponding edge to the DFA.
//
// @param input The input stream
// @param s The current DFA state
// @param t The next input symbol
//
// @return The computed target DFA state for the given input symbol
// {@code t}. If {@code t} does not lead to a valid DFA state, this method
// returns {@link //ERROR}.
LexerATNSimulator.prototype.computeTargetState = function(input, s, t) {
	var reach = new OrderedATNConfigSet();
	// if we don't find an existing DFA state
	// Fill reach starting from closure, following t transitions
	this.getReachableConfigSet(input, s.configs, reach, t);

	if (reach.items.length === 0) { // we got nowhere on t from s
		if (!reach.hasSemanticContext) {
			// we got nowhere on t, don't throw out this knowledge; it'd
			// cause a failover from DFA later.
			this.addDFAEdge(s, t, ATNSimulator.ERROR);
		}
		// stop when we can't match any more char
		return ATNSimulator.ERROR;
	}
	// Add an edge from s to target DFA found/created for reach
	return this.addDFAEdge(s, t, null, reach);
};

LexerATNSimulator.prototype.failOrAccept = function(prevAccept, input, reach, t) {
	if (this.prevAccept.dfaState !== null) {
		var lexerActionExecutor = prevAccept.dfaState.lexerActionExecutor;
		this.accept(input, lexerActionExecutor, this.startIndex,
				prevAccept.index, prevAccept.line, prevAccept.column);
		return prevAccept.dfaState.prediction;
	} else {
		// if no accept and EOF is first char, return EOF
		if (t === Token.EOF && input.index === this.startIndex) {
			return Token.EOF;
		}
		throw new LexerNoViableAltException(this.recog, input, this.startIndex, reach);
	}
};

// Given a starting configuration set, figure out all ATN configurations
// we can reach upon input {@code t}. Parameter {@code reach} is a return
// parameter.
LexerATNSimulator.prototype.getReachableConfigSet = function(input, closure,
		reach, t) {
	// this is used to skip processing for configs which have a lower priority
	// than a config that already reached an accept state for the same rule
	var skipAlt = ATN.INVALID_ALT_NUMBER;
	for (var i = 0; i < closure.items.length; i++) {
		var cfg = closure.items[i];
		var currentAltReachedAcceptState = (cfg.alt === skipAlt);
		if (currentAltReachedAcceptState && cfg.passedThroughNonGreedyDecision) {
			continue;
		}
		if (LexerATNSimulator.debug) {
			console.log("testing %s at %s\n", this.getTokenName(t), cfg
					.toString(this.recog, true));
		}
		for (var j = 0; j < cfg.state.transitions.length; j++) {
			var trans = cfg.state.transitions[j]; // for each transition
			var target = this.getReachableTarget(trans, t);
			if (target !== null) {
				var lexerActionExecutor = cfg.lexerActionExecutor;
				if (lexerActionExecutor !== null) {
					lexerActionExecutor = lexerActionExecutor.fixOffsetBeforeMatch(input.index - this.startIndex);
				}
				var treatEofAsEpsilon = (t === Token.EOF);
				var config = new LexerATNConfig({state:target, lexerActionExecutor:lexerActionExecutor}, cfg);
				if (this.closure(input, config, reach,
						currentAltReachedAcceptState, true, treatEofAsEpsilon)) {
					// any remaining configs for this alt have a lower priority
					// than the one that just reached an accept state.
					skipAlt = cfg.alt;
				}
			}
		}
	}
};

LexerATNSimulator.prototype.accept = function(input, lexerActionExecutor,
		startIndex, index, line, charPos) {
	if (LexerATNSimulator.debug) {
		console.log("ACTION %s\n", lexerActionExecutor);
	}
	// seek to after last char in token
	input.seek(index);
	this.line = line;
	this.column = charPos;
	if (lexerActionExecutor !== null && this.recog !== null) {
		lexerActionExecutor.execute(this.recog, input, startIndex);
	}
};

LexerATNSimulator.prototype.getReachableTarget = function(trans, t) {
	if (trans.matches(t, 0, Lexer.MAX_CHAR_VALUE)) {
		return trans.target;
	} else {
		return null;
	}
};

LexerATNSimulator.prototype.computeStartState = function(input, p) {
	var initialContext = PredictionContext.EMPTY;
	var configs = new OrderedATNConfigSet();
	for (var i = 0; i < p.transitions.length; i++) {
		var target = p.transitions[i].target;
        var cfg = new LexerATNConfig({state:target, alt:i+1, context:initialContext}, null);
		this.closure(input, cfg, configs, false, false, false);
	}
	return configs;
};

// Since the alternatives within any lexer decision are ordered by
// preference, this method stops pursuing the closure as soon as an accept
// state is reached. After the first accept state is reached by depth-first
// search from {@code config}, all other (potentially reachable) states for
// this rule would have a lower priority.
//
// @return {@code true} if an accept state is reached, otherwise
// {@code false}.
LexerATNSimulator.prototype.closure = function(input, config, configs,
		currentAltReachedAcceptState, speculative, treatEofAsEpsilon) {
	var cfg = null;
	if (LexerATNSimulator.debug) {
		console.log("closure(" + config.toString(this.recog, true) + ")");
	}
	if (config.state instanceof RuleStopState) {
		if (LexerATNSimulator.debug) {
			if (this.recog !== null) {
				console.log("closure at %s rule stop %s\n", this.recog.ruleNames[config.state.ruleIndex], config);
			} else {
				console.log("closure at rule stop %s\n", config);
			}
		}
		if (config.context === null || config.context.hasEmptyPath()) {
			if (config.context === null || config.context.isEmpty()) {
				configs.add(config);
				return true;
			} else {
				configs.add(new LexerATNConfig({ state:config.state, context:PredictionContext.EMPTY}, config));
				currentAltReachedAcceptState = true;
			}
		}
		if (config.context !== null && !config.context.isEmpty()) {
			for (var i = 0; i < config.context.length; i++) {
				if (config.context.getReturnState(i) !== PredictionContext.EMPTY_RETURN_STATE) {
					var newContext = config.context.getParent(i); // "pop" return state
					var returnState = this.atn.states[config.context.getReturnState(i)];
					cfg = new LexerATNConfig({ state:returnState, context:newContext }, config);
					currentAltReachedAcceptState = this.closure(input, cfg,
							configs, currentAltReachedAcceptState, speculative,
							treatEofAsEpsilon);
				}
			}
		}
		return currentAltReachedAcceptState;
	}
	// optimization
	if (!config.state.epsilonOnlyTransitions) {
		if (!currentAltReachedAcceptState || !config.passedThroughNonGreedyDecision) {
			configs.add(config);
		}
	}
	for (var j = 0; j < config.state.transitions.length; j++) {
		var trans = config.state.transitions[j];
		cfg = this.getEpsilonTarget(input, config, trans, configs, speculative, treatEofAsEpsilon);
		if (cfg !== null) {
			currentAltReachedAcceptState = this.closure(input, cfg, configs,
					currentAltReachedAcceptState, speculative, treatEofAsEpsilon);
		}
	}
	return currentAltReachedAcceptState;
};

// side-effect: can alter configs.hasSemanticContext
LexerATNSimulator.prototype.getEpsilonTarget = function(input, config, trans,
		configs, speculative, treatEofAsEpsilon) {
	var cfg = null;
	if (trans.serializationType === Transition.RULE) {
		var newContext = SingletonPredictionContext.create(config.context, trans.followState.stateNumber);
		cfg = new LexerATNConfig( { state:trans.target, context:newContext}, config);
	} else if (trans.serializationType === Transition.PRECEDENCE) {
		throw "Precedence predicates are not supported in lexers.";
	} else if (trans.serializationType === Transition.PREDICATE) {
		// Track traversing semantic predicates. If we traverse,
		// we cannot add a DFA state for this "reach" computation
		// because the DFA would not test the predicate again in the
		// future. Rather than creating collections of semantic predicates
		// like v3 and testing them on prediction, v4 will test them on the
		// fly all the time using the ATN not the DFA. This is slower but
		// semantically it's not used that often. One of the key elements to
		// this predicate mechanism is not adding DFA states that see
		// predicates immediately afterwards in the ATN. For example,

		// a : ID {p1}? | ID {p2}? ;

		// should create the start state for rule 'a' (to save start state
		// competition), but should not create target of ID state. The
		// collection of ATN states the following ID references includes
		// states reached by traversing predicates. Since this is when we
		// test them, we cannot cash the DFA state target of ID.

		if (LexerATNSimulator.debug) {
			console.log("EVAL rule " + trans.ruleIndex + ":" + trans.predIndex);
		}
		configs.hasSemanticContext = true;
		if (this.evaluatePredicate(input, trans.ruleIndex, trans.predIndex, speculative)) {
			cfg = new LexerATNConfig({ state:trans.target}, config);
		}
	} else if (trans.serializationType === Transition.ACTION) {
		if (config.context === null || config.context.hasEmptyPath()) {
			// execute actions anywhere in the start rule for a token.
			//
			// TODO: if the entry rule is invoked recursively, some
			// actions may be executed during the recursive call. The
			// problem can appear when hasEmptyPath() is true but
			// isEmpty() is false. In this case, the config needs to be
			// split into two contexts - one with just the empty path
			// and another with everything but the empty path.
			// Unfortunately, the current algorithm does not allow
			// getEpsilonTarget to return two configurations, so
			// additional modifications are needed before we can support
			// the split operation.
			var lexerActionExecutor = LexerActionExecutor.append(config.lexerActionExecutor,
					this.atn.lexerActions[trans.actionIndex]);
			cfg = new LexerATNConfig({ state:trans.target, lexerActionExecutor:lexerActionExecutor }, config);
		} else {
			// ignore actions in referenced rules
			cfg = new LexerATNConfig( { state:trans.target}, config);
		}
	} else if (trans.serializationType === Transition.EPSILON) {
		cfg = new LexerATNConfig({ state:trans.target}, config);
	} else if (trans.serializationType === Transition.ATOM ||
				trans.serializationType === Transition.RANGE ||
				trans.serializationType === Transition.SET) {
		if (treatEofAsEpsilon) {
			if (trans.matches(Token.EOF, 0, Lexer.MAX_CHAR_VALUE)) {
				cfg = new LexerATNConfig( { state:trans.target }, config);
			}
		}
	}
	return cfg;
};

// Evaluate a predicate specified in the lexer.
//
// <p>If {@code speculative} is {@code true}, this method was called before
// {@link //consume} for the matched character. This method should call
// {@link //consume} before evaluating the predicate to ensure position
// sensitive values, including {@link Lexer//getText}, {@link Lexer//getLine},
// and {@link Lexer//getcolumn}, properly reflect the current
// lexer state. This method should restore {@code input} and the simulator
// to the original state before returning (i.e. undo the actions made by the
// call to {@link //consume}.</p>
//
// @param input The input stream.
// @param ruleIndex The rule containing the predicate.
// @param predIndex The index of the predicate within the rule.
// @param speculative {@code true} if the current index in {@code input} is
// one character before the predicate's location.
//
// @return {@code true} if the specified predicate evaluates to
// {@code true}.
// /
LexerATNSimulator.prototype.evaluatePredicate = function(input, ruleIndex,
		predIndex, speculative) {
	// assume true if no recognizer was provided
	if (this.recog === null) {
		return true;
	}
	if (!speculative) {
		return this.recog.sempred(null, ruleIndex, predIndex);
	}
	var savedcolumn = this.column;
	var savedLine = this.line;
	var index = input.index;
	var marker = input.mark();
	try {
		this.consume(input);
		return this.recog.sempred(null, ruleIndex, predIndex);
	} finally {
		this.column = savedcolumn;
		this.line = savedLine;
		input.seek(index);
		input.release(marker);
	}
};

LexerATNSimulator.prototype.captureSimState = function(settings, input, dfaState) {
	settings.index = input.index;
	settings.line = this.line;
	settings.column = this.column;
	settings.dfaState = dfaState;
};

LexerATNSimulator.prototype.addDFAEdge = function(from_, tk, to, cfgs) {
	if (to === undefined) {
		to = null;
	}
	if (cfgs === undefined) {
		cfgs = null;
	}
	if (to === null && cfgs !== null) {
		// leading to this call, ATNConfigSet.hasSemanticContext is used as a
		// marker indicating dynamic predicate evaluation makes this edge
		// dependent on the specific input sequence, so the static edge in the
		// DFA should be omitted. The target DFAState is still created since
		// execATN has the ability to resynchronize with the DFA state cache
		// following the predicate evaluation step.
		//
		// TJP notes: next time through the DFA, we see a pred again and eval.
		// If that gets us to a previously created (but dangling) DFA
		// state, we can continue in pure DFA mode from there.
		// /
		var suppressEdge = cfgs.hasSemanticContext;
		cfgs.hasSemanticContext = false;

		to = this.addDFAState(cfgs);

		if (suppressEdge) {
			return to;
		}
	}
	// add the edge
	if (tk < LexerATNSimulator.MIN_DFA_EDGE || tk > LexerATNSimulator.MAX_DFA_EDGE) {
		// Only track edges within the DFA bounds
		return to;
	}
	if (LexerATNSimulator.debug) {
		console.log("EDGE " + from_ + " -> " + to + " upon " + tk);
	}
	if (from_.edges === null) {
		// make room for tokens 1..n and -1 masquerading as index 0
		from_.edges = [];
	}
	from_.edges[tk - LexerATNSimulator.MIN_DFA_EDGE] = to; // connect

	return to;
};

// Add a new DFA state if there isn't one with this set of
// configurations already. This method also detects the first
// configuration containing an ATN rule stop state. Later, when
// traversing the DFA, we will know which rule to accept.
LexerATNSimulator.prototype.addDFAState = function(configs) {
	var proposed = new DFAState(null, configs);
	var firstConfigWithRuleStopState = null;
	for (var i = 0; i < configs.items.length; i++) {
		var cfg = configs.items[i];
		if (cfg.state instanceof RuleStopState) {
			firstConfigWithRuleStopState = cfg;
			break;
		}
	}
	if (firstConfigWithRuleStopState !== null) {
		proposed.isAcceptState = true;
		proposed.lexerActionExecutor = firstConfigWithRuleStopState.lexerActionExecutor;
		proposed.prediction = this.atn.ruleToTokenType[firstConfigWithRuleStopState.state.ruleIndex];
	}
	var dfa = this.decisionToDFA[this.mode];
	var existing = dfa.states.get(proposed);
	if (existing!==null) {
		return existing;
	}
	var newState = proposed;
	newState.stateNumber = dfa.states.length;
	configs.setReadonly(true);
	newState.configs = configs;
	dfa.states.add(newState);
	return newState;
};

LexerATNSimulator.prototype.getDFA = function(mode) {
	return this.decisionToDFA[mode];
};

// Get the text matched so far for the current token.
LexerATNSimulator.prototype.getText = function(input) {
	// index is first lookahead char, don't include.
	return input.getText(this.startIndex, input.index - 1);
};

LexerATNSimulator.prototype.consume = function(input) {
	var curChar = input.LA(1);
	if (curChar === "\n".charCodeAt(0)) {
		this.line += 1;
		this.column = 0;
	} else {
		this.column += 1;
	}
	input.consume();
};

LexerATNSimulator.prototype.getTokenName = function(tt) {
	if (tt === -1) {
		return "EOF";
	} else {
		return "'" + String.fromCharCode(tt) + "'";
	}
};

exports.LexerATNSimulator = LexerATNSimulator;


/***/ }),

/***/ "./node_modules/antlr4/atn/LexerAction.js":
/*!************************************************!*\
  !*** ./node_modules/antlr4/atn/LexerAction.js ***!
  \************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
 //

function LexerActionType() {
}

LexerActionType.CHANNEL = 0;     //The type of a {@link LexerChannelAction} action.
LexerActionType.CUSTOM = 1;      //The type of a {@link LexerCustomAction} action.
LexerActionType.MODE = 2;        //The type of a {@link LexerModeAction} action.
LexerActionType.MORE = 3;        //The type of a {@link LexerMoreAction} action.
LexerActionType.POP_MODE = 4;    //The type of a {@link LexerPopModeAction} action.
LexerActionType.PUSH_MODE = 5;   //The type of a {@link LexerPushModeAction} action.
LexerActionType.SKIP = 6;        //The type of a {@link LexerSkipAction} action.
LexerActionType.TYPE = 7;        //The type of a {@link LexerTypeAction} action.

function LexerAction(action) {
    this.actionType = action;
    this.isPositionDependent = false;
    return this;
}

LexerAction.prototype.hashCode = function() {
    var hash = new Hash();
    this.updateHashCode(hash);
    return hash.finish()
};

LexerAction.prototype.updateHashCode = function(hash) {
    hash.update(this.actionType);
};

LexerAction.prototype.equals = function(other) {
    return this === other;
};



//
// Implements the {@code skip} lexer action by calling {@link Lexer//skip}.
//
// <p>The {@code skip} command does not have any parameters, so this action is
// implemented as a singleton instance exposed by {@link //INSTANCE}.</p>
function LexerSkipAction() {
	LexerAction.call(this, LexerActionType.SKIP);
	return this;
}

LexerSkipAction.prototype = Object.create(LexerAction.prototype);
LexerSkipAction.prototype.constructor = LexerSkipAction;

// Provides a singleton instance of this parameterless lexer action.
LexerSkipAction.INSTANCE = new LexerSkipAction();

LexerSkipAction.prototype.execute = function(lexer) {
    lexer.skip();
};

LexerSkipAction.prototype.toString = function() {
	return "skip";
};

//  Implements the {@code type} lexer action by calling {@link Lexer//setType}
// with the assigned type.
function LexerTypeAction(type) {
	LexerAction.call(this, LexerActionType.TYPE);
	this.type = type;
	return this;
}

LexerTypeAction.prototype = Object.create(LexerAction.prototype);
LexerTypeAction.prototype.constructor = LexerTypeAction;

LexerTypeAction.prototype.execute = function(lexer) {
    lexer.type = this.type;
};

LexerTypeAction.prototype.updateHashCode = function(hash) {
    hash.update(this.actionType, this.type);
};


LexerTypeAction.prototype.equals = function(other) {
    if(this === other) {
        return true;
    } else if (! (other instanceof LexerTypeAction)) {
        return false;
    } else {
        return this.type === other.type;
    }
};

LexerTypeAction.prototype.toString = function() {
    return "type(" + this.type + ")";
};

// Implements the {@code pushMode} lexer action by calling
// {@link Lexer//pushMode} with the assigned mode.
function LexerPushModeAction(mode) {
	LexerAction.call(this, LexerActionType.PUSH_MODE);
    this.mode = mode;
    return this;
}

LexerPushModeAction.prototype = Object.create(LexerAction.prototype);
LexerPushModeAction.prototype.constructor = LexerPushModeAction;

// <p>This action is implemented by calling {@link Lexer//pushMode} with the
// value provided by {@link //getMode}.</p>
LexerPushModeAction.prototype.execute = function(lexer) {
    lexer.pushMode(this.mode);
};

LexerPushModeAction.prototype.updateHashCode = function(hash) {
    hash.update(this.actionType, this.mode);
};

LexerPushModeAction.prototype.equals = function(other) {
    if (this === other) {
        return true;
    } else if (! (other instanceof LexerPushModeAction)) {
        return false;
    } else {
        return this.mode === other.mode;
    }
};

LexerPushModeAction.prototype.toString = function() {
	return "pushMode(" + this.mode + ")";
};


// Implements the {@code popMode} lexer action by calling {@link Lexer//popMode}.
//
// <p>The {@code popMode} command does not have any parameters, so this action is
// implemented as a singleton instance exposed by {@link //INSTANCE}.</p>
function LexerPopModeAction() {
	LexerAction.call(this,LexerActionType.POP_MODE);
	return this;
}

LexerPopModeAction.prototype = Object.create(LexerAction.prototype);
LexerPopModeAction.prototype.constructor = LexerPopModeAction;

LexerPopModeAction.INSTANCE = new LexerPopModeAction();

// <p>This action is implemented by calling {@link Lexer//popMode}.</p>
LexerPopModeAction.prototype.execute = function(lexer) {
    lexer.popMode();
};

LexerPopModeAction.prototype.toString = function() {
	return "popMode";
};

// Implements the {@code more} lexer action by calling {@link Lexer//more}.
//
// <p>The {@code more} command does not have any parameters, so this action is
// implemented as a singleton instance exposed by {@link //INSTANCE}.</p>
function LexerMoreAction() {
	LexerAction.call(this, LexerActionType.MORE);
	return this;
}

LexerMoreAction.prototype = Object.create(LexerAction.prototype);
LexerMoreAction.prototype.constructor = LexerMoreAction;

LexerMoreAction.INSTANCE = new LexerMoreAction();

// <p>This action is implemented by calling {@link Lexer//popMode}.</p>
LexerMoreAction.prototype.execute = function(lexer) {
    lexer.more();
};

LexerMoreAction.prototype.toString = function() {
    return "more";
};


// Implements the {@code mode} lexer action by calling {@link Lexer//mode} with
// the assigned mode.
function LexerModeAction(mode) {
	LexerAction.call(this, LexerActionType.MODE);
    this.mode = mode;
    return this;
}

LexerModeAction.prototype = Object.create(LexerAction.prototype);
LexerModeAction.prototype.constructor = LexerModeAction;

// <p>This action is implemented by calling {@link Lexer//mode} with the
// value provided by {@link //getMode}.</p>
LexerModeAction.prototype.execute = function(lexer) {
    lexer.mode(this.mode);
};

LexerModeAction.prototype.updateHashCode = function(hash) {
    hash.update(this.actionType, this.mode);
};

LexerModeAction.prototype.equals = function(other) {
    if (this === other) {
        return true;
    } else if (! (other instanceof LexerModeAction)) {
        return false;
    } else {
        return this.mode === other.mode;
    }
};

LexerModeAction.prototype.toString = function() {
    return "mode(" + this.mode + ")";
};

// Executes a custom lexer action by calling {@link Recognizer//action} with the
// rule and action indexes assigned to the custom action. The implementation of
// a custom action is added to the generated code for the lexer in an override
// of {@link Recognizer//action} when the grammar is compiled.
//
// <p>This class may represent embedded actions created with the <code>{...}</code>
// syntax in ANTLR 4, as well as actions created for lexer commands where the
// command argument could not be evaluated when the grammar was compiled.</p>


    // Constructs a custom lexer action with the specified rule and action
    // indexes.
    //
    // @param ruleIndex The rule index to use for calls to
    // {@link Recognizer//action}.
    // @param actionIndex The action index to use for calls to
    // {@link Recognizer//action}.

function LexerCustomAction(ruleIndex, actionIndex) {
	LexerAction.call(this, LexerActionType.CUSTOM);
    this.ruleIndex = ruleIndex;
    this.actionIndex = actionIndex;
    this.isPositionDependent = true;
    return this;
}

LexerCustomAction.prototype = Object.create(LexerAction.prototype);
LexerCustomAction.prototype.constructor = LexerCustomAction;

// <p>Custom actions are implemented by calling {@link Lexer//action} with the
// appropriate rule and action indexes.</p>
LexerCustomAction.prototype.execute = function(lexer) {
    lexer.action(null, this.ruleIndex, this.actionIndex);
};

LexerCustomAction.prototype.updateHashCode = function(hash) {
    hash.update(this.actionType, this.ruleIndex, this.actionIndex);
};

LexerCustomAction.prototype.equals = function(other) {
    if (this === other) {
        return true;
    } else if (! (other instanceof LexerCustomAction)) {
        return false;
    } else {
        return this.ruleIndex === other.ruleIndex && this.actionIndex === other.actionIndex;
    }
};

// Implements the {@code channel} lexer action by calling
// {@link Lexer//setChannel} with the assigned channel.
// Constructs a new {@code channel} action with the specified channel value.
// @param channel The channel value to pass to {@link Lexer//setChannel}.
function LexerChannelAction(channel) {
	LexerAction.call(this, LexerActionType.CHANNEL);
    this.channel = channel;
    return this;
}

LexerChannelAction.prototype = Object.create(LexerAction.prototype);
LexerChannelAction.prototype.constructor = LexerChannelAction;

// <p>This action is implemented by calling {@link Lexer//setChannel} with the
// value provided by {@link //getChannel}.</p>
LexerChannelAction.prototype.execute = function(lexer) {
    lexer._channel = this.channel;
};

LexerChannelAction.prototype.updateHashCode = function(hash) {
    hash.update(this.actionType, this.channel);
};

LexerChannelAction.prototype.equals = function(other) {
    if (this === other) {
        return true;
    } else if (! (other instanceof LexerChannelAction)) {
        return false;
    } else {
        return this.channel === other.channel;
    }
};

LexerChannelAction.prototype.toString = function() {
    return "channel(" + this.channel + ")";
};

// This implementation of {@link LexerAction} is used for tracking input offsets
// for position-dependent actions within a {@link LexerActionExecutor}.
//
// <p>This action is not serialized as part of the ATN, and is only required for
// position-dependent lexer actions which appear at a location other than the
// end of a rule. For more information about DFA optimizations employed for
// lexer actions, see {@link LexerActionExecutor//append} and
// {@link LexerActionExecutor//fixOffsetBeforeMatch}.</p>

// Constructs a new indexed custom action by associating a character offset
// with a {@link LexerAction}.
//
// <p>Note: This class is only required for lexer actions for which
// {@link LexerAction//isPositionDependent} returns {@code true}.</p>
//
// @param offset The offset into the input {@link CharStream}, relative to
// the token start index, at which the specified lexer action should be
// executed.
// @param action The lexer action to execute at a particular offset in the
// input {@link CharStream}.
function LexerIndexedCustomAction(offset, action) {
	LexerAction.call(this, action.actionType);
    this.offset = offset;
    this.action = action;
    this.isPositionDependent = true;
    return this;
}

LexerIndexedCustomAction.prototype = Object.create(LexerAction.prototype);
LexerIndexedCustomAction.prototype.constructor = LexerIndexedCustomAction;

// <p>This method calls {@link //execute} on the result of {@link //getAction}
// using the provided {@code lexer}.</p>
LexerIndexedCustomAction.prototype.execute = function(lexer) {
    // assume the input stream position was properly set by the calling code
    this.action.execute(lexer);
};

LexerIndexedCustomAction.prototype.updateHashCode = function(hash) {
    hash.update(this.actionType, this.offset, this.action);
};

LexerIndexedCustomAction.prototype.equals = function(other) {
    if (this === other) {
        return true;
    } else if (! (other instanceof LexerIndexedCustomAction)) {
        return false;
    } else {
        return this.offset === other.offset && this.action === other.action;
    }
};


exports.LexerActionType = LexerActionType;
exports.LexerSkipAction = LexerSkipAction;
exports.LexerChannelAction = LexerChannelAction;
exports.LexerCustomAction = LexerCustomAction;
exports.LexerIndexedCustomAction = LexerIndexedCustomAction;
exports.LexerMoreAction = LexerMoreAction;
exports.LexerTypeAction = LexerTypeAction;
exports.LexerPushModeAction = LexerPushModeAction;
exports.LexerPopModeAction = LexerPopModeAction;
exports.LexerModeAction = LexerModeAction;

/***/ }),

/***/ "./node_modules/antlr4/atn/LexerActionExecutor.js":
/*!********************************************************!*\
  !*** ./node_modules/antlr4/atn/LexerActionExecutor.js ***!
  \********************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
///

// Represents an executor for a sequence of lexer actions which traversed during
// the matching operation of a lexer rule (token).
//
// <p>The executor tracks position information for position-dependent lexer actions
// efficiently, ensuring that actions appearing only at the end of the rule do
// not cause bloating of the {@link DFA} created for the lexer.</p>

var hashStuff = __webpack_require__(/*! ../Utils */ "./node_modules/antlr4/Utils.js").hashStuff;
var LexerIndexedCustomAction = __webpack_require__(/*! ./LexerAction */ "./node_modules/antlr4/atn/LexerAction.js").LexerIndexedCustomAction;

function LexerActionExecutor(lexerActions) {
	this.lexerActions = lexerActions === null ? [] : lexerActions;
	// Caches the result of {@link //hashCode} since the hash code is an element
	// of the performance-critical {@link LexerATNConfig//hashCode} operation.
	this.cachedHashCode = hashStuff(lexerActions); // "".join([str(la) for la in
	// lexerActions]))
	return this;
}

// Creates a {@link LexerActionExecutor} which executes the actions for
// the input {@code lexerActionExecutor} followed by a specified
// {@code lexerAction}.
//
// @param lexerActionExecutor The executor for actions already traversed by
// the lexer while matching a token within a particular
// {@link LexerATNConfig}. If this is {@code null}, the method behaves as
// though it were an empty executor.
// @param lexerAction The lexer action to execute after the actions
// specified in {@code lexerActionExecutor}.
//
// @return A {@link LexerActionExecutor} for executing the combine actions
// of {@code lexerActionExecutor} and {@code lexerAction}.
LexerActionExecutor.append = function(lexerActionExecutor, lexerAction) {
	if (lexerActionExecutor === null) {
		return new LexerActionExecutor([ lexerAction ]);
	}
	var lexerActions = lexerActionExecutor.lexerActions.concat([ lexerAction ]);
	return new LexerActionExecutor(lexerActions);
};

// Creates a {@link LexerActionExecutor} which encodes the current offset
// for position-dependent lexer actions.
//
// <p>Normally, when the executor encounters lexer actions where
// {@link LexerAction//isPositionDependent} returns {@code true}, it calls
// {@link IntStream//seek} on the input {@link CharStream} to set the input
// position to the <em>end</em> of the current token. This behavior provides
// for efficient DFA representation of lexer actions which appear at the end
// of a lexer rule, even when the lexer rule matches a variable number of
// characters.</p>
//
// <p>Prior to traversing a match transition in the ATN, the current offset
// from the token start index is assigned to all position-dependent lexer
// actions which have not already been assigned a fixed offset. By storing
// the offsets relative to the token start index, the DFA representation of
// lexer actions which appear in the middle of tokens remains efficient due
// to sharing among tokens of the same length, regardless of their absolute
// position in the input stream.</p>
//
// <p>If the current executor already has offsets assigned to all
// position-dependent lexer actions, the method returns {@code this}.</p>
//
// @param offset The current offset to assign to all position-dependent
// lexer actions which do not already have offsets assigned.
//
// @return A {@link LexerActionExecutor} which stores input stream offsets
// for all position-dependent lexer actions.
// /
LexerActionExecutor.prototype.fixOffsetBeforeMatch = function(offset) {
	var updatedLexerActions = null;
	for (var i = 0; i < this.lexerActions.length; i++) {
		if (this.lexerActions[i].isPositionDependent &&
				!(this.lexerActions[i] instanceof LexerIndexedCustomAction)) {
			if (updatedLexerActions === null) {
				updatedLexerActions = this.lexerActions.concat([]);
			}
			updatedLexerActions[i] = new LexerIndexedCustomAction(offset,
					this.lexerActions[i]);
		}
	}
	if (updatedLexerActions === null) {
		return this;
	} else {
		return new LexerActionExecutor(updatedLexerActions);
	}
};

// Execute the actions encapsulated by this executor within the context of a
// particular {@link Lexer}.
//
// <p>This method calls {@link IntStream//seek} to set the position of the
// {@code input} {@link CharStream} prior to calling
// {@link LexerAction//execute} on a position-dependent action. Before the
// method returns, the input position will be restored to the same position
// it was in when the method was invoked.</p>
//
// @param lexer The lexer instance.
// @param input The input stream which is the source for the current token.
// When this method is called, the current {@link IntStream//index} for
// {@code input} should be the start of the following token, i.e. 1
// character past the end of the current token.
// @param startIndex The token start index. This value may be passed to
// {@link IntStream//seek} to set the {@code input} position to the beginning
// of the token.
// /
LexerActionExecutor.prototype.execute = function(lexer, input, startIndex) {
	var requiresSeek = false;
	var stopIndex = input.index;
	try {
		for (var i = 0; i < this.lexerActions.length; i++) {
			var lexerAction = this.lexerActions[i];
			if (lexerAction instanceof LexerIndexedCustomAction) {
				var offset = lexerAction.offset;
				input.seek(startIndex + offset);
				lexerAction = lexerAction.action;
				requiresSeek = (startIndex + offset) !== stopIndex;
			} else if (lexerAction.isPositionDependent) {
				input.seek(stopIndex);
				requiresSeek = false;
			}
			lexerAction.execute(lexer);
		}
	} finally {
		if (requiresSeek) {
			input.seek(stopIndex);
		}
	}
};

LexerActionExecutor.prototype.hashCode = function() {
	return this.cachedHashCode;
};

LexerActionExecutor.prototype.updateHashCode = function(hash) {
    hash.update(this.cachedHashCode);
};


LexerActionExecutor.prototype.equals = function(other) {
	if (this === other) {
		return true;
	} else if (!(other instanceof LexerActionExecutor)) {
		return false;
	} else if (this.cachedHashCode != other.cachedHashCode) {
		return false;
	} else if (this.lexerActions.length != other.lexerActions.length) {
		return false;
	} else {
		var numActions = this.lexerActions.length
		for (var idx = 0; idx < numActions; ++idx) {
			if (!this.lexerActions[idx].equals(other.lexerActions[idx])) {
				return false;
			}
		}
		return true;
	}
};

exports.LexerActionExecutor = LexerActionExecutor;


/***/ }),

/***/ "./node_modules/antlr4/atn/ParserATNSimulator.js":
/*!*******************************************************!*\
  !*** ./node_modules/antlr4/atn/ParserATNSimulator.js ***!
  \*******************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
//

//
// The embodiment of the adaptive LL(*), ALL(*), parsing strategy.
//
// <p>
// The basic complexity of the adaptive strategy makes it harder to understand.
// We begin with ATN simulation to build paths in a DFA. Subsequent prediction
// requests go through the DFA first. If they reach a state without an edge for
// the current symbol, the algorithm fails over to the ATN simulation to
// complete the DFA path for the current input (until it finds a conflict state
// or uniquely predicting state).</p>
//
// <p>
// All of that is done without using the outer context because we want to create
// a DFA that is not dependent upon the rule invocation stack when we do a
// prediction. One DFA works in all contexts. We avoid using context not
// necessarily because it's slower, although it can be, but because of the DFA
// caching problem. The closure routine only considers the rule invocation stack
// created during prediction beginning in the decision rule. For example, if
// prediction occurs without invoking another rule's ATN, there are no context
// stacks in the configurations. When lack of context leads to a conflict, we
// don't know if it's an ambiguity or a weakness in the strong LL(*) parsing
// strategy (versus full LL(*)).</p>
//
// <p>
// When SLL yields a configuration set with conflict, we rewind the input and
// retry the ATN simulation, this time using full outer context without adding
// to the DFA. Configuration context stacks will be the full invocation stacks
// from the start rule. If we get a conflict using full context, then we can
// definitively say we have a true ambiguity for that input sequence. If we
// don't get a conflict, it implies that the decision is sensitive to the outer
// context. (It is not context-sensitive in the sense of context-sensitive
// grammars.)</p>
//
// <p>
// The next time we reach this DFA state with an SLL conflict, through DFA
// simulation, we will again retry the ATN simulation using full context mode.
// This is slow because we can't save the results and have to "interpret" the
// ATN each time we get that input.</p>
//
// <p>
// <strong>CACHING FULL CONTEXT PREDICTIONS</strong></p>
//
// <p>
// We could cache results from full context to predicted alternative easily and
// that saves a lot of time but doesn't work in presence of predicates. The set
// of visible predicates from the ATN start state changes depending on the
// context, because closure can fall off the end of a rule. I tried to cache
// tuples (stack context, semantic context, predicted alt) but it was slower
// than interpreting and much more complicated. Also required a huge amount of
// memory. The goal is not to create the world's fastest parser anyway. I'd like
// to keep this algorithm simple. By launching multiple threads, we can improve
// the speed of parsing across a large number of files.</p>
//
// <p>
// There is no strict ordering between the amount of input used by SLL vs LL,
// which makes it really hard to build a cache for full context. Let's say that
// we have input A B C that leads to an SLL conflict with full context X. That
// implies that using X we might only use A B but we could also use A B C D to
// resolve conflict. Input A B C D could predict alternative 1 in one position
// in the input and A B C E could predict alternative 2 in another position in
// input. The conflicting SLL configurations could still be non-unique in the
// full context prediction, which would lead us to requiring more input than the
// original A B C.	To make a	prediction cache work, we have to track	the exact
// input	used during the previous prediction. That amounts to a cache that maps
// X to a specific DFA for that context.</p>
//
// <p>
// Something should be done for left-recursive expression predictions. They are
// likely LL(1) + pred eval. Easier to do the whole SLL unless error and retry
// with full LL thing Sam does.</p>
//
// <p>
// <strong>AVOIDING FULL CONTEXT PREDICTION</strong></p>
//
// <p>
// We avoid doing full context retry when the outer context is empty, we did not
// dip into the outer context by falling off the end of the decision state rule,
// or when we force SLL mode.</p>
//
// <p>
// As an example of the not dip into outer context case, consider as super
// constructor calls versus function calls. One grammar might look like
// this:</p>
//
// <pre>
// ctorBody
//   : '{' superCall? stat* '}'
//   ;
// </pre>
//
// <p>
// Or, you might see something like</p>
//
// <pre>
// stat
//   : superCall ';'
//   | expression ';'
//   | ...
//   ;
// </pre>
//
// <p>
// In both cases I believe that no closure operations will dip into the outer
// context. In the first case ctorBody in the worst case will stop at the '}'.
// In the 2nd case it should stop at the ';'. Both cases should stay within the
// entry rule and not dip into the outer context.</p>
//
// <p>
// <strong>PREDICATES</strong></p>
//
// <p>
// Predicates are always evaluated if present in either SLL or LL both. SLL and
// LL simulation deals with predicates differently. SLL collects predicates as
// it performs closure operations like ANTLR v3 did. It delays predicate
// evaluation until it reaches and accept state. This allows us to cache the SLL
// ATN simulation whereas, if we had evaluated predicates on-the-fly during
// closure, the DFA state configuration sets would be different and we couldn't
// build up a suitable DFA.</p>
//
// <p>
// When building a DFA accept state during ATN simulation, we evaluate any
// predicates and return the sole semantically valid alternative. If there is
// more than 1 alternative, we report an ambiguity. If there are 0 alternatives,
// we throw an exception. Alternatives without predicates act like they have
// true predicates. The simple way to think about it is to strip away all
// alternatives with false predicates and choose the minimum alternative that
// remains.</p>
//
// <p>
// When we start in the DFA and reach an accept state that's predicated, we test
// those and return the minimum semantically viable alternative. If no
// alternatives are viable, we throw an exception.</p>
//
// <p>
// During full LL ATN simulation, closure always evaluates predicates and
// on-the-fly. This is crucial to reducing the configuration set size during
// closure. It hits a landmine when parsing with the Java grammar, for example,
// without this on-the-fly evaluation.</p>
//
// <p>
// <strong>SHARING DFA</strong></p>
//
// <p>
// All instances of the same parser share the same decision DFAs through a
// static field. Each instance gets its own ATN simulator but they share the
// same {@link //decisionToDFA} field. They also share a
// {@link PredictionContextCache} object that makes sure that all
// {@link PredictionContext} objects are shared among the DFA states. This makes
// a big size difference.</p>
//
// <p>
// <strong>THREAD SAFETY</strong></p>
//
// <p>
// The {@link ParserATNSimulator} locks on the {@link //decisionToDFA} field when
// it adds a new DFA object to that array. {@link //addDFAEdge}
// locks on the DFA for the current decision when setting the
// {@link DFAState//edges} field. {@link //addDFAState} locks on
// the DFA for the current decision when looking up a DFA state to see if it
// already exists. We must make sure that all requests to add DFA states that
// are equivalent result in the same shared DFA object. This is because lots of
// threads will be trying to update the DFA at once. The
// {@link //addDFAState} method also locks inside the DFA lock
// but this time on the shared context cache when it rebuilds the
// configurations' {@link PredictionContext} objects using cached
// subgraphs/nodes. No other locking occurs, even during DFA simulation. This is
// safe as long as we can guarantee that all threads referencing
// {@code s.edge[t]} get the same physical target {@link DFAState}, or
// {@code null}. Once into the DFA, the DFA simulation does not reference the
// {@link DFA//states} map. It follows the {@link DFAState//edges} field to new
// targets. The DFA simulator will either find {@link DFAState//edges} to be
// {@code null}, to be non-{@code null} and {@code dfa.edges[t]} null, or
// {@code dfa.edges[t]} to be non-null. The
// {@link //addDFAEdge} method could be racing to set the field
// but in either case the DFA simulator works; if {@code null}, and requests ATN
// simulation. It could also race trying to get {@code dfa.edges[t]}, but either
// way it will work because it's not doing a test and set operation.</p>
//
// <p>
// <strong>Starting with SLL then failing to combined SLL/LL (Two-Stage
// Parsing)</strong></p>
//
// <p>
// Sam pointed out that if SLL does not give a syntax error, then there is no
// point in doing full LL, which is slower. We only have to try LL if we get a
// syntax error. For maximum speed, Sam starts the parser set to pure SLL
// mode with the {@link BailErrorStrategy}:</p>
//
// <pre>
// parser.{@link Parser//getInterpreter() getInterpreter()}.{@link //setPredictionMode setPredictionMode}{@code (}{@link PredictionMode//SLL}{@code )};
// parser.{@link Parser//setErrorHandler setErrorHandler}(new {@link BailErrorStrategy}());
// </pre>
//
// <p>
// If it does not get a syntax error, then we're done. If it does get a syntax
// error, we need to retry with the combined SLL/LL strategy.</p>
//
// <p>
// The reason this works is as follows. If there are no SLL conflicts, then the
// grammar is SLL (at least for that input set). If there is an SLL conflict,
// the full LL analysis must yield a set of viable alternatives which is a
// subset of the alternatives reported by SLL. If the LL set is a singleton,
// then the grammar is LL but not SLL. If the LL set is the same size as the SLL
// set, the decision is SLL. If the LL set has size &gt; 1, then that decision
// is truly ambiguous on the current input. If the LL set is smaller, then the
// SLL conflict resolution might choose an alternative that the full LL would
// rule out as a possibility based upon better context information. If that's
// the case, then the SLL parse will definitely get an error because the full LL
// analysis says it's not viable. If SLL conflict resolution chooses an
// alternative within the LL set, them both SLL and LL would choose the same
// alternative because they both choose the minimum of multiple conflicting
// alternatives.</p>
//
// <p>
// Let's say we have a set of SLL conflicting alternatives {@code {1, 2, 3}} and
// a smaller LL set called <em>s</em>. If <em>s</em> is {@code {2, 3}}, then SLL
// parsing will get an error because SLL will pursue alternative 1. If
// <em>s</em> is {@code {1, 2}} or {@code {1, 3}} then both SLL and LL will
// choose the same alternative because alternative one is the minimum of either
// set. If <em>s</em> is {@code {2}} or {@code {3}} then SLL will get a syntax
// error. If <em>s</em> is {@code {1}} then SLL will succeed.</p>
//
// <p>
// Of course, if the input is invalid, then we will get an error for sure in
// both SLL and LL parsing. Erroneous input will therefore require 2 passes over
// the input.</p>
//

var Utils = __webpack_require__(/*! ./../Utils */ "./node_modules/antlr4/Utils.js");
var Set = Utils.Set;
var BitSet = Utils.BitSet;
var DoubleDict = Utils.DoubleDict;
var ATN = __webpack_require__(/*! ./ATN */ "./node_modules/antlr4/atn/ATN.js").ATN;
var ATNState = __webpack_require__(/*! ./ATNState */ "./node_modules/antlr4/atn/ATNState.js").ATNState;
var ATNConfig = __webpack_require__(/*! ./ATNConfig */ "./node_modules/antlr4/atn/ATNConfig.js").ATNConfig;
var ATNConfigSet = __webpack_require__(/*! ./ATNConfigSet */ "./node_modules/antlr4/atn/ATNConfigSet.js").ATNConfigSet;
var Token = __webpack_require__(/*! ./../Token */ "./node_modules/antlr4/Token.js").Token;
var DFAState = __webpack_require__(/*! ./../dfa/DFAState */ "./node_modules/antlr4/dfa/DFAState.js").DFAState;
var PredPrediction = __webpack_require__(/*! ./../dfa/DFAState */ "./node_modules/antlr4/dfa/DFAState.js").PredPrediction;
var ATNSimulator = __webpack_require__(/*! ./ATNSimulator */ "./node_modules/antlr4/atn/ATNSimulator.js").ATNSimulator;
var PredictionMode = __webpack_require__(/*! ./PredictionMode */ "./node_modules/antlr4/atn/PredictionMode.js").PredictionMode;
var RuleContext = __webpack_require__(/*! ./../RuleContext */ "./node_modules/antlr4/RuleContext.js").RuleContext;
var ParserRuleContext = __webpack_require__(/*! ./../ParserRuleContext */ "./node_modules/antlr4/ParserRuleContext.js").ParserRuleContext;
var SemanticContext = __webpack_require__(/*! ./SemanticContext */ "./node_modules/antlr4/atn/SemanticContext.js").SemanticContext;
var StarLoopEntryState = __webpack_require__(/*! ./ATNState */ "./node_modules/antlr4/atn/ATNState.js").StarLoopEntryState;
var RuleStopState = __webpack_require__(/*! ./ATNState */ "./node_modules/antlr4/atn/ATNState.js").RuleStopState;
var PredictionContext = __webpack_require__(/*! ./../PredictionContext */ "./node_modules/antlr4/PredictionContext.js").PredictionContext;
var Interval = __webpack_require__(/*! ./../IntervalSet */ "./node_modules/antlr4/IntervalSet.js").Interval;
var Transitions = __webpack_require__(/*! ./Transition */ "./node_modules/antlr4/atn/Transition.js");
var Transition = Transitions.Transition;
var SetTransition = Transitions.SetTransition;
var NotSetTransition = Transitions.NotSetTransition;
var RuleTransition = Transitions.RuleTransition;
var ActionTransition = Transitions.ActionTransition;
var NoViableAltException = __webpack_require__(/*! ./../error/Errors */ "./node_modules/antlr4/error/Errors.js").NoViableAltException;

var SingletonPredictionContext = __webpack_require__(/*! ./../PredictionContext */ "./node_modules/antlr4/PredictionContext.js").SingletonPredictionContext;
var predictionContextFromRuleContext = __webpack_require__(/*! ./../PredictionContext */ "./node_modules/antlr4/PredictionContext.js").predictionContextFromRuleContext;

function ParserATNSimulator(parser, atn, decisionToDFA, sharedContextCache) {
	ATNSimulator.call(this, atn, sharedContextCache);
    this.parser = parser;
    this.decisionToDFA = decisionToDFA;
    // SLL, LL, or LL + exact ambig detection?//
    this.predictionMode = PredictionMode.LL;
    // LAME globals to avoid parameters!!!!! I need these down deep in predTransition
    this._input = null;
    this._startIndex = 0;
    this._outerContext = null;
    this._dfa = null;
    // Each prediction operation uses a cache for merge of prediction contexts.
    //  Don't keep around as it wastes huge amounts of memory. DoubleKeyMap
    //  isn't synchronized but we're ok since two threads shouldn't reuse same
    //  parser/atnsim object because it can only handle one input at a time.
    //  This maps graphs a and b to merged result c. (a,b)&rarr;c. We can avoid
    //  the merge if we ever see a and b again.  Note that (b,a)&rarr;c should
    //  also be examined during cache lookup.
    //
    this.mergeCache = null;
    return this;
}

ParserATNSimulator.prototype = Object.create(ATNSimulator.prototype);
ParserATNSimulator.prototype.constructor = ParserATNSimulator;

ParserATNSimulator.prototype.debug = false;
ParserATNSimulator.prototype.debug_closure = false;
ParserATNSimulator.prototype.debug_add = false;
ParserATNSimulator.prototype.debug_list_atn_decisions = false;
ParserATNSimulator.prototype.dfa_debug = false;
ParserATNSimulator.prototype.retry_debug = false;


ParserATNSimulator.prototype.reset = function() {
};

ParserATNSimulator.prototype.adaptivePredict = function(input, decision, outerContext) {
    if (this.debug || this.debug_list_atn_decisions) {
        console.log("adaptivePredict decision " + decision +
                               " exec LA(1)==" + this.getLookaheadName(input) +
                               " line " + input.LT(1).line + ":" +
                               input.LT(1).column);
    }
    this._input = input;
    this._startIndex = input.index;
    this._outerContext = outerContext;

    var dfa = this.decisionToDFA[decision];
    this._dfa = dfa;
    var m = input.mark();
    var index = input.index;

    // Now we are certain to have a specific decision's DFA
    // But, do we still need an initial state?
    try {
        var s0;
        if (dfa.precedenceDfa) {
            // the start state for a precedence DFA depends on the current
            // parser precedence, and is provided by a DFA method.
            s0 = dfa.getPrecedenceStartState(this.parser.getPrecedence());
        } else {
            // the start state for a "regular" DFA is just s0
            s0 = dfa.s0;
        }
        if (s0===null) {
            if (outerContext===null) {
                outerContext = RuleContext.EMPTY;
            }
            if (this.debug || this.debug_list_atn_decisions) {
                console.log("predictATN decision " + dfa.decision +
                                   " exec LA(1)==" + this.getLookaheadName(input) +
                                   ", outerContext=" + outerContext.toString(this.parser.ruleNames));
            }

            var fullCtx = false;
            var s0_closure = this.computeStartState(dfa.atnStartState, RuleContext.EMPTY, fullCtx);

            if( dfa.precedenceDfa) {
                // If this is a precedence DFA, we use applyPrecedenceFilter
                // to convert the computed start state to a precedence start
                // state. We then use DFA.setPrecedenceStartState to set the
                // appropriate start state for the precedence level rather
                // than simply setting DFA.s0.
                //
                dfa.s0.configs = s0_closure; // not used for prediction but useful to know start configs anyway
                s0_closure = this.applyPrecedenceFilter(s0_closure);
                s0 = this.addDFAState(dfa, new DFAState(null, s0_closure));
                dfa.setPrecedenceStartState(this.parser.getPrecedence(), s0);
            } else {
                s0 = this.addDFAState(dfa, new DFAState(null, s0_closure));
                dfa.s0 = s0;
            }
        }
        var alt = this.execATN(dfa, s0, input, index, outerContext);
        if (this.debug) {
            console.log("DFA after predictATN: " + dfa.toString(this.parser.literalNames));
        }
        return alt;
    } finally {
        this._dfa = null;
        this.mergeCache = null; // wack cache after each prediction
        input.seek(index);
        input.release(m);
    }
};
// Performs ATN simulation to compute a predicted alternative based
//  upon the remaining input, but also updates the DFA cache to avoid
//  having to traverse the ATN again for the same input sequence.

// There are some key conditions we're looking for after computing a new
// set of ATN configs (proposed DFA state):
      // if the set is empty, there is no viable alternative for current symbol
      // does the state uniquely predict an alternative?
      // does the state have a conflict that would prevent us from
      //   putting it on the work list?

// We also have some key operations to do:
      // add an edge from previous DFA state to potentially new DFA state, D,
      //   upon current symbol but only if adding to work list, which means in all
      //   cases except no viable alternative (and possibly non-greedy decisions?)
      // collecting predicates and adding semantic context to DFA accept states
      // adding rule context to context-sensitive DFA accept states
      // consuming an input symbol
      // reporting a conflict
      // reporting an ambiguity
      // reporting a context sensitivity
      // reporting insufficient predicates

// cover these cases:
//    dead end
//    single alt
//    single alt + preds
//    conflict
//    conflict + preds
//
ParserATNSimulator.prototype.execATN = function(dfa, s0, input, startIndex, outerContext ) {
    if (this.debug || this.debug_list_atn_decisions) {
        console.log("execATN decision " + dfa.decision +
                " exec LA(1)==" + this.getLookaheadName(input) +
                " line " + input.LT(1).line + ":" + input.LT(1).column);
    }
    var alt;
    var previousD = s0;

    if (this.debug) {
        console.log("s0 = " + s0);
    }
    var t = input.LA(1);
    while(true) { // while more work
        var D = this.getExistingTargetState(previousD, t);
        if(D===null) {
            D = this.computeTargetState(dfa, previousD, t);
        }
        if(D===ATNSimulator.ERROR) {
            // if any configs in previous dipped into outer context, that
            // means that input up to t actually finished entry rule
            // at least for SLL decision. Full LL doesn't dip into outer
            // so don't need special case.
            // We will get an error no matter what so delay until after
            // decision; better error message. Also, no reachable target
            // ATN states in SLL implies LL will also get nowhere.
            // If conflict in states that dip out, choose min since we
            // will get error no matter what.
            var e = this.noViableAlt(input, outerContext, previousD.configs, startIndex);
            input.seek(startIndex);
            alt = this.getSynValidOrSemInvalidAltThatFinishedDecisionEntryRule(previousD.configs, outerContext);
            if(alt!==ATN.INVALID_ALT_NUMBER) {
                return alt;
            } else {
                throw e;
            }
        }
        if(D.requiresFullContext && this.predictionMode !== PredictionMode.SLL) {
            // IF PREDS, MIGHT RESOLVE TO SINGLE ALT => SLL (or syntax error)
            var conflictingAlts = null;
            if (D.predicates!==null) {
                if (this.debug) {
                    console.log("DFA state has preds in DFA sim LL failover");
                }
                var conflictIndex = input.index;
                if(conflictIndex !== startIndex) {
                    input.seek(startIndex);
                }
                conflictingAlts = this.evalSemanticContext(D.predicates, outerContext, true);
                if (conflictingAlts.length===1) {
                    if(this.debug) {
                        console.log("Full LL avoided");
                    }
                    return conflictingAlts.minValue();
                }
                if (conflictIndex !== startIndex) {
                    // restore the index so reporting the fallback to full
                    // context occurs with the index at the correct spot
                    input.seek(conflictIndex);
                }
            }
            if (this.dfa_debug) {
                console.log("ctx sensitive state " + outerContext +" in " + D);
            }
            var fullCtx = true;
            var s0_closure = this.computeStartState(dfa.atnStartState, outerContext, fullCtx);
            this.reportAttemptingFullContext(dfa, conflictingAlts, D.configs, startIndex, input.index);
            alt = this.execATNWithFullContext(dfa, D, s0_closure, input, startIndex, outerContext);
            return alt;
        }
        if (D.isAcceptState) {
            if (D.predicates===null) {
                return D.prediction;
            }
            var stopIndex = input.index;
            input.seek(startIndex);
            var alts = this.evalSemanticContext(D.predicates, outerContext, true);
            if (alts.length===0) {
                throw this.noViableAlt(input, outerContext, D.configs, startIndex);
            } else if (alts.length===1) {
                return alts.minValue();
            } else {
                // report ambiguity after predicate evaluation to make sure the correct set of ambig alts is reported.
                this.reportAmbiguity(dfa, D, startIndex, stopIndex, false, alts, D.configs);
                return alts.minValue();
            }
        }
        previousD = D;

        if (t !== Token.EOF) {
            input.consume();
            t = input.LA(1);
        }
    }
};
//
// Get an existing target state for an edge in the DFA. If the target state
// for the edge has not yet been computed or is otherwise not available,
// this method returns {@code null}.
//
// @param previousD The current DFA state
// @param t The next input symbol
// @return The existing target DFA state for the given input symbol
// {@code t}, or {@code null} if the target state for this edge is not
// already cached
//
ParserATNSimulator.prototype.getExistingTargetState = function(previousD, t) {
    var edges = previousD.edges;
    if (edges===null) {
        return null;
    } else {
        return edges[t + 1] || null;
    }
};
//
// Compute a target state for an edge in the DFA, and attempt to add the
// computed state and corresponding edge to the DFA.
//
// @param dfa The DFA
// @param previousD The current DFA state
// @param t The next input symbol
//
// @return The computed target DFA state for the given input symbol
// {@code t}. If {@code t} does not lead to a valid DFA state, this method
// returns {@link //ERROR}.
//
ParserATNSimulator.prototype.computeTargetState = function(dfa, previousD, t) {
   var reach = this.computeReachSet(previousD.configs, t, false);
    if(reach===null) {
        this.addDFAEdge(dfa, previousD, t, ATNSimulator.ERROR);
        return ATNSimulator.ERROR;
    }
    // create new target state; we'll add to DFA after it's complete
    var D = new DFAState(null, reach);

    var predictedAlt = this.getUniqueAlt(reach);

    if (this.debug) {
        var altSubSets = PredictionMode.getConflictingAltSubsets(reach);
        console.log("SLL altSubSets=" + Utils.arrayToString(altSubSets) +
                    ", previous=" + previousD.configs +
                    ", configs=" + reach +
                    ", predict=" + predictedAlt +
                    ", allSubsetsConflict=" +
                    PredictionMode.allSubsetsConflict(altSubSets) + ", conflictingAlts=" +
                    this.getConflictingAlts(reach));
    }
    if (predictedAlt!==ATN.INVALID_ALT_NUMBER) {
        // NO CONFLICT, UNIQUELY PREDICTED ALT
        D.isAcceptState = true;
        D.configs.uniqueAlt = predictedAlt;
        D.prediction = predictedAlt;
    } else if (PredictionMode.hasSLLConflictTerminatingPrediction(this.predictionMode, reach)) {
        // MORE THAN ONE VIABLE ALTERNATIVE
        D.configs.conflictingAlts = this.getConflictingAlts(reach);
        D.requiresFullContext = true;
        // in SLL-only mode, we will stop at this state and return the minimum alt
        D.isAcceptState = true;
        D.prediction = D.configs.conflictingAlts.minValue();
    }
    if (D.isAcceptState && D.configs.hasSemanticContext) {
        this.predicateDFAState(D, this.atn.getDecisionState(dfa.decision));
        if( D.predicates!==null) {
            D.prediction = ATN.INVALID_ALT_NUMBER;
        }
    }
    // all adds to dfa are done after we've created full D state
    D = this.addDFAEdge(dfa, previousD, t, D);
    return D;
};

ParserATNSimulator.prototype.predicateDFAState = function(dfaState, decisionState) {
    // We need to test all predicates, even in DFA states that
    // uniquely predict alternative.
    var nalts = decisionState.transitions.length;
    // Update DFA so reach becomes accept state with (predicate,alt)
    // pairs if preds found for conflicting alts
    var altsToCollectPredsFrom = this.getConflictingAltsOrUniqueAlt(dfaState.configs);
    var altToPred = this.getPredsForAmbigAlts(altsToCollectPredsFrom, dfaState.configs, nalts);
    if (altToPred!==null) {
        dfaState.predicates = this.getPredicatePredictions(altsToCollectPredsFrom, altToPred);
        dfaState.prediction = ATN.INVALID_ALT_NUMBER; // make sure we use preds
    } else {
        // There are preds in configs but they might go away
        // when OR'd together like {p}? || NONE == NONE. If neither
        // alt has preds, resolve to min alt
        dfaState.prediction = altsToCollectPredsFrom.minValue();
    }
};

// comes back with reach.uniqueAlt set to a valid alt
ParserATNSimulator.prototype.execATNWithFullContext = function(dfa, D, // how far we got before failing over
                                     s0,
                                     input,
                                     startIndex,
                                     outerContext) {
    if (this.debug || this.debug_list_atn_decisions) {
        console.log("execATNWithFullContext "+s0);
    }
    var fullCtx = true;
    var foundExactAmbig = false;
    var reach = null;
    var previous = s0;
    input.seek(startIndex);
    var t = input.LA(1);
    var predictedAlt = -1;
    while (true) { // while more work
        reach = this.computeReachSet(previous, t, fullCtx);
        if (reach===null) {
            // if any configs in previous dipped into outer context, that
            // means that input up to t actually finished entry rule
            // at least for LL decision. Full LL doesn't dip into outer
            // so don't need special case.
            // We will get an error no matter what so delay until after
            // decision; better error message. Also, no reachable target
            // ATN states in SLL implies LL will also get nowhere.
            // If conflict in states that dip out, choose min since we
            // will get error no matter what.
            var e = this.noViableAlt(input, outerContext, previous, startIndex);
            input.seek(startIndex);
            var alt = this.getSynValidOrSemInvalidAltThatFinishedDecisionEntryRule(previous, outerContext);
            if(alt!==ATN.INVALID_ALT_NUMBER) {
                return alt;
            } else {
                throw e;
            }
        }
        var altSubSets = PredictionMode.getConflictingAltSubsets(reach);
        if(this.debug) {
            console.log("LL altSubSets=" + altSubSets + ", predict=" +
                  PredictionMode.getUniqueAlt(altSubSets) + ", resolvesToJustOneViableAlt=" +
                  PredictionMode.resolvesToJustOneViableAlt(altSubSets));
        }
        reach.uniqueAlt = this.getUniqueAlt(reach);
        // unique prediction?
        if(reach.uniqueAlt!==ATN.INVALID_ALT_NUMBER) {
            predictedAlt = reach.uniqueAlt;
            break;
        } else if (this.predictionMode !== PredictionMode.LL_EXACT_AMBIG_DETECTION) {
            predictedAlt = PredictionMode.resolvesToJustOneViableAlt(altSubSets);
            if(predictedAlt !== ATN.INVALID_ALT_NUMBER) {
                break;
            }
        } else {
            // In exact ambiguity mode, we never try to terminate early.
            // Just keeps scarfing until we know what the conflict is
            if (PredictionMode.allSubsetsConflict(altSubSets) && PredictionMode.allSubsetsEqual(altSubSets)) {
                foundExactAmbig = true;
                predictedAlt = PredictionMode.getSingleViableAlt(altSubSets);
                break;
            }
            // else there are multiple non-conflicting subsets or
            // we're not sure what the ambiguity is yet.
            // So, keep going.
        }
        previous = reach;
        if( t !== Token.EOF) {
            input.consume();
            t = input.LA(1);
        }
    }
    // If the configuration set uniquely predicts an alternative,
    // without conflict, then we know that it's a full LL decision
    // not SLL.
    if (reach.uniqueAlt !== ATN.INVALID_ALT_NUMBER ) {
        this.reportContextSensitivity(dfa, predictedAlt, reach, startIndex, input.index);
        return predictedAlt;
    }
    // We do not check predicates here because we have checked them
    // on-the-fly when doing full context prediction.

    //
    // In non-exact ambiguity detection mode, we might	actually be able to
    // detect an exact ambiguity, but I'm not going to spend the cycles
    // needed to check. We only emit ambiguity warnings in exact ambiguity
    // mode.
    //
    // For example, we might know that we have conflicting configurations.
    // But, that does not mean that there is no way forward without a
    // conflict. It's possible to have nonconflicting alt subsets as in:

    // altSubSets=[{1, 2}, {1, 2}, {1}, {1, 2}]

    // from
    //
    //    [(17,1,[5 $]), (13,1,[5 10 $]), (21,1,[5 10 $]), (11,1,[$]),
    //     (13,2,[5 10 $]), (21,2,[5 10 $]), (11,2,[$])]
    //
    // In this case, (17,1,[5 $]) indicates there is some next sequence that
    // would resolve this without conflict to alternative 1. Any other viable
    // next sequence, however, is associated with a conflict.  We stop
    // looking for input because no amount of further lookahead will alter
    // the fact that we should predict alternative 1.  We just can't say for
    // sure that there is an ambiguity without looking further.

    this.reportAmbiguity(dfa, D, startIndex, input.index, foundExactAmbig, null, reach);

    return predictedAlt;
};

ParserATNSimulator.prototype.computeReachSet = function(closure, t, fullCtx) {
    if (this.debug) {
        console.log("in computeReachSet, starting closure: " + closure);
    }
    if( this.mergeCache===null) {
        this.mergeCache = new DoubleDict();
    }
    var intermediate = new ATNConfigSet(fullCtx);

    // Configurations already in a rule stop state indicate reaching the end
    // of the decision rule (local context) or end of the start rule (full
    // context). Once reached, these configurations are never updated by a
    // closure operation, so they are handled separately for the performance
    // advantage of having a smaller intermediate set when calling closure.
    //
    // For full-context reach operations, separate handling is required to
    // ensure that the alternative matching the longest overall sequence is
    // chosen when multiple such configurations can match the input.

    var skippedStopStates = null;

    // First figure out where we can reach on input t
    for (var i=0; i<closure.items.length;i++) {
        var c = closure.items[i];
        if(this.debug_add) {
            console.log("testing " + this.getTokenName(t) + " at " + c);
        }
        if (c.state instanceof RuleStopState) {
            if (fullCtx || t === Token.EOF) {
                if (skippedStopStates===null) {
                    skippedStopStates = [];
                }
                skippedStopStates.push(c);
                if(this.debug_add) {
                    console.log("added " + c + " to skippedStopStates");
                }
            }
            continue;
        }
        for(var j=0;j<c.state.transitions.length;j++) {
            var trans = c.state.transitions[j];
            var target = this.getReachableTarget(trans, t);
            if (target!==null) {
                var cfg = new ATNConfig({state:target}, c);
                intermediate.add(cfg, this.mergeCache);
                if(this.debug_add) {
                    console.log("added " + cfg + " to intermediate");
                }
            }
        }
    }
    // Now figure out where the reach operation can take us...
    var reach = null;

    // This block optimizes the reach operation for intermediate sets which
    // trivially indicate a termination state for the overall
    // adaptivePredict operation.
    //
    // The conditions assume that intermediate
    // contains all configurations relevant to the reach set, but this
    // condition is not true when one or more configurations have been
    // withheld in skippedStopStates, or when the current symbol is EOF.
    //
    if (skippedStopStates===null && t!==Token.EOF) {
        if (intermediate.items.length===1) {
            // Don't pursue the closure if there is just one state.
            // It can only have one alternative; just add to result
            // Also don't pursue the closure if there is unique alternative
            // among the configurations.
            reach = intermediate;
        } else if (this.getUniqueAlt(intermediate)!==ATN.INVALID_ALT_NUMBER) {
            // Also don't pursue the closure if there is unique alternative
            // among the configurations.
            reach = intermediate;
        }
    }
    // If the reach set could not be trivially determined, perform a closure
    // operation on the intermediate set to compute its initial value.
    //
    if (reach===null) {
        reach = new ATNConfigSet(fullCtx);
        var closureBusy = new Set();
        var treatEofAsEpsilon = t === Token.EOF;
        for (var k=0; k<intermediate.items.length;k++) {
            this.closure(intermediate.items[k], reach, closureBusy, false, fullCtx, treatEofAsEpsilon);
        }
    }
    if (t === Token.EOF) {
        // After consuming EOF no additional input is possible, so we are
        // only interested in configurations which reached the end of the
        // decision rule (local context) or end of the start rule (full
        // context). Update reach to contain only these configurations. This
        // handles both explicit EOF transitions in the grammar and implicit
        // EOF transitions following the end of the decision or start rule.
        //
        // When reach==intermediate, no closure operation was performed. In
        // this case, removeAllConfigsNotInRuleStopState needs to check for
        // reachable rule stop states as well as configurations already in
        // a rule stop state.
        //
        // This is handled before the configurations in skippedStopStates,
        // because any configurations potentially added from that list are
        // already guaranteed to meet this condition whether or not it's
        // required.
        //
        reach = this.removeAllConfigsNotInRuleStopState(reach, reach === intermediate);
    }
    // If skippedStopStates!==null, then it contains at least one
    // configuration. For full-context reach operations, these
    // configurations reached the end of the start rule, in which case we
    // only add them back to reach if no configuration during the current
    // closure operation reached such a state. This ensures adaptivePredict
    // chooses an alternative matching the longest overall sequence when
    // multiple alternatives are viable.
    //
    if (skippedStopStates!==null && ( (! fullCtx) || (! PredictionMode.hasConfigInRuleStopState(reach)))) {
        for (var l=0; l<skippedStopStates.length;l++) {
            reach.add(skippedStopStates[l], this.mergeCache);
        }
    }
    if (reach.items.length===0) {
        return null;
    } else {
        return reach;
    }
};
//
// Return a configuration set containing only the configurations from
// {@code configs} which are in a {@link RuleStopState}. If all
// configurations in {@code configs} are already in a rule stop state, this
// method simply returns {@code configs}.
//
// <p>When {@code lookToEndOfRule} is true, this method uses
// {@link ATN//nextTokens} for each configuration in {@code configs} which is
// not already in a rule stop state to see if a rule stop state is reachable
// from the configuration via epsilon-only transitions.</p>
//
// @param configs the configuration set to update
// @param lookToEndOfRule when true, this method checks for rule stop states
// reachable by epsilon-only transitions from each configuration in
// {@code configs}.
//
// @return {@code configs} if all configurations in {@code configs} are in a
// rule stop state, otherwise return a new configuration set containing only
// the configurations from {@code configs} which are in a rule stop state
//
ParserATNSimulator.prototype.removeAllConfigsNotInRuleStopState = function(configs, lookToEndOfRule) {
    if (PredictionMode.allConfigsInRuleStopStates(configs)) {
        return configs;
    }
    var result = new ATNConfigSet(configs.fullCtx);
    for(var i=0; i<configs.items.length;i++) {
        var config = configs.items[i];
        if (config.state instanceof RuleStopState) {
            result.add(config, this.mergeCache);
            continue;
        }
        if (lookToEndOfRule && config.state.epsilonOnlyTransitions) {
            var nextTokens = this.atn.nextTokens(config.state);
            if (nextTokens.contains(Token.EPSILON)) {
                var endOfRuleState = this.atn.ruleToStopState[config.state.ruleIndex];
                result.add(new ATNConfig({state:endOfRuleState}, config), this.mergeCache);
            }
        }
    }
    return result;
};

ParserATNSimulator.prototype.computeStartState = function(p, ctx, fullCtx) {
    // always at least the implicit call to start rule
    var initialContext = predictionContextFromRuleContext(this.atn, ctx);
    var configs = new ATNConfigSet(fullCtx);
    for(var i=0;i<p.transitions.length;i++) {
        var target = p.transitions[i].target;
        var c = new ATNConfig({ state:target, alt:i+1, context:initialContext }, null);
        var closureBusy = new Set();
        this.closure(c, configs, closureBusy, true, fullCtx, false);
    }
    return configs;
};

//
// This method transforms the start state computed by
// {@link //computeStartState} to the special start state used by a
// precedence DFA for a particular precedence value. The transformation
// process applies the following changes to the start state's configuration
// set.
//
// <ol>
// <li>Evaluate the precedence predicates for each configuration using
// {@link SemanticContext//evalPrecedence}.</li>
// <li>Remove all configurations which predict an alternative greater than
// 1, for which another configuration that predicts alternative 1 is in the
// same ATN state with the same prediction context. This transformation is
// valid for the following reasons:
// <ul>
// <li>The closure block cannot contain any epsilon transitions which bypass
// the body of the closure, so all states reachable via alternative 1 are
// part of the precedence alternatives of the transformed left-recursive
// rule.</li>
// <li>The "primary" portion of a left recursive rule cannot contain an
// epsilon transition, so the only way an alternative other than 1 can exist
// in a state that is also reachable via alternative 1 is by nesting calls
// to the left-recursive rule, with the outer calls not being at the
// preferred precedence level.</li>
// </ul>
// </li>
// </ol>
//
// <p>
// The prediction context must be considered by this filter to address
// situations like the following.
// </p>
// <code>
// <pre>
// grammar TA;
// prog: statement* EOF;
// statement: letterA | statement letterA 'b' ;
// letterA: 'a';
// </pre>
// </code>
// <p>
// If the above grammar, the ATN state immediately before the token
// reference {@code 'a'} in {@code letterA} is reachable from the left edge
// of both the primary and closure blocks of the left-recursive rule
// {@code statement}. The prediction context associated with each of these
// configurations distinguishes between them, and prevents the alternative
// which stepped out to {@code prog} (and then back in to {@code statement}
// from being eliminated by the filter.
// </p>
//
// @param configs The configuration set computed by
// {@link //computeStartState} as the start state for the DFA.
// @return The transformed configuration set representing the start state
// for a precedence DFA at a particular precedence level (determined by
// calling {@link Parser//getPrecedence}).
//
ParserATNSimulator.prototype.applyPrecedenceFilter = function(configs) {
	var config;
	var statesFromAlt1 = [];
    var configSet = new ATNConfigSet(configs.fullCtx);
    for(var i=0; i<configs.items.length; i++) {
        config = configs.items[i];
        // handle alt 1 first
        if (config.alt !== 1) {
            continue;
        }
        var updatedContext = config.semanticContext.evalPrecedence(this.parser, this._outerContext);
        if (updatedContext===null) {
            // the configuration was eliminated
            continue;
        }
        statesFromAlt1[config.state.stateNumber] = config.context;
        if (updatedContext !== config.semanticContext) {
            configSet.add(new ATNConfig({semanticContext:updatedContext}, config), this.mergeCache);
        } else {
            configSet.add(config, this.mergeCache);
        }
    }
    for(i=0; i<configs.items.length; i++) {
        config = configs.items[i];
        if (config.alt === 1) {
            // already handled
            continue;
        }
        // In the future, this elimination step could be updated to also
        // filter the prediction context for alternatives predicting alt>1
        // (basically a graph subtraction algorithm).
		if (!config.precedenceFilterSuppressed) {
            var context = statesFromAlt1[config.state.stateNumber] || null;
            if (context!==null && context.equals(config.context)) {
                // eliminated
                continue;
            }
		}
        configSet.add(config, this.mergeCache);
    }
    return configSet;
};

ParserATNSimulator.prototype.getReachableTarget = function(trans, ttype) {
    if (trans.matches(ttype, 0, this.atn.maxTokenType)) {
        return trans.target;
    } else {
        return null;
    }
};

ParserATNSimulator.prototype.getPredsForAmbigAlts = function(ambigAlts, configs, nalts) {
    // REACH=[1|1|[]|0:0, 1|2|[]|0:1]
    // altToPred starts as an array of all null contexts. The entry at index i
    // corresponds to alternative i. altToPred[i] may have one of three values:
    //   1. null: no ATNConfig c is found such that c.alt==i
    //   2. SemanticContext.NONE: At least one ATNConfig c exists such that
    //      c.alt==i and c.semanticContext==SemanticContext.NONE. In other words,
    //      alt i has at least one unpredicated config.
    //   3. Non-NONE Semantic Context: There exists at least one, and for all
    //      ATNConfig c such that c.alt==i, c.semanticContext!=SemanticContext.NONE.
    //
    // From this, it is clear that NONE||anything==NONE.
    //
    var altToPred = [];
    for(var i=0;i<configs.items.length;i++) {
        var c = configs.items[i];
        if(ambigAlts.contains( c.alt )) {
            altToPred[c.alt] = SemanticContext.orContext(altToPred[c.alt] || null, c.semanticContext);
        }
    }
    var nPredAlts = 0;
    for (i =1;i< nalts+1;i++) {
        var pred = altToPred[i] || null;
        if (pred===null) {
            altToPred[i] = SemanticContext.NONE;
        } else if (pred !== SemanticContext.NONE) {
            nPredAlts += 1;
        }
    }
    // nonambig alts are null in altToPred
    if (nPredAlts===0) {
        altToPred = null;
    }
    if (this.debug) {
        console.log("getPredsForAmbigAlts result " + Utils.arrayToString(altToPred));
    }
    return altToPred;
};

ParserATNSimulator.prototype.getPredicatePredictions = function(ambigAlts, altToPred) {
    var pairs = [];
    var containsPredicate = false;
    for (var i=1; i<altToPred.length;i++) {
        var pred = altToPred[i];
        // unpredicated is indicated by SemanticContext.NONE
        if( ambigAlts!==null && ambigAlts.contains( i )) {
            pairs.push(new PredPrediction(pred, i));
        }
        if (pred !== SemanticContext.NONE) {
            containsPredicate = true;
        }
    }
    if (! containsPredicate) {
        return null;
    }
    return pairs;
};

//
// This method is used to improve the localization of error messages by
// choosing an alternative rather than throwing a
// {@link NoViableAltException} in particular prediction scenarios where the
// {@link //ERROR} state was reached during ATN simulation.
//
// <p>
// The default implementation of this method uses the following
// algorithm to identify an ATN configuration which successfully parsed the
// decision entry rule. Choosing such an alternative ensures that the
// {@link ParserRuleContext} returned by the calling rule will be complete
// and valid, and the syntax error will be reported later at a more
// localized location.</p>
//
// <ul>
// <li>If a syntactically valid path or paths reach the end of the decision rule and
// they are semantically valid if predicated, return the min associated alt.</li>
// <li>Else, if a semantically invalid but syntactically valid path exist
// or paths exist, return the minimum associated alt.
// </li>
// <li>Otherwise, return {@link ATN//INVALID_ALT_NUMBER}.</li>
// </ul>
//
// <p>
// In some scenarios, the algorithm described above could predict an
// alternative which will result in a {@link FailedPredicateException} in
// the parser. Specifically, this could occur if the <em>only</em> configuration
// capable of successfully parsing to the end of the decision rule is
// blocked by a semantic predicate. By choosing this alternative within
// {@link //adaptivePredict} instead of throwing a
// {@link NoViableAltException}, the resulting
// {@link FailedPredicateException} in the parser will identify the specific
// predicate which is preventing the parser from successfully parsing the
// decision rule, which helps developers identify and correct logic errors
// in semantic predicates.
// </p>
//
// @param configs The ATN configurations which were valid immediately before
// the {@link //ERROR} state was reached
// @param outerContext The is the \gamma_0 initial parser context from the paper
// or the parser stack at the instant before prediction commences.
//
// @return The value to return from {@link //adaptivePredict}, or
// {@link ATN//INVALID_ALT_NUMBER} if a suitable alternative was not
// identified and {@link //adaptivePredict} should report an error instead.
//
ParserATNSimulator.prototype.getSynValidOrSemInvalidAltThatFinishedDecisionEntryRule = function(configs, outerContext) {
    var cfgs = this.splitAccordingToSemanticValidity(configs, outerContext);
    var semValidConfigs = cfgs[0];
    var semInvalidConfigs = cfgs[1];
    var alt = this.getAltThatFinishedDecisionEntryRule(semValidConfigs);
    if (alt!==ATN.INVALID_ALT_NUMBER) { // semantically/syntactically viable path exists
        return alt;
    }
    // Is there a syntactically valid path with a failed pred?
    if (semInvalidConfigs.items.length>0) {
        alt = this.getAltThatFinishedDecisionEntryRule(semInvalidConfigs);
        if (alt!==ATN.INVALID_ALT_NUMBER) { // syntactically viable path exists
            return alt;
        }
    }
    return ATN.INVALID_ALT_NUMBER;
};

ParserATNSimulator.prototype.getAltThatFinishedDecisionEntryRule = function(configs) {
    var alts = [];
    for(var i=0;i<configs.items.length; i++) {
        var c = configs.items[i];
        if (c.reachesIntoOuterContext>0 || ((c.state instanceof RuleStopState) && c.context.hasEmptyPath())) {
            if(alts.indexOf(c.alt)<0) {
                alts.push(c.alt);
            }
        }
    }
    if (alts.length===0) {
        return ATN.INVALID_ALT_NUMBER;
    } else {
        return Math.min.apply(null, alts);
    }
};
// Walk the list of configurations and split them according to
//  those that have preds evaluating to true/false.  If no pred, assume
//  true pred and include in succeeded set.  Returns Pair of sets.
//
//  Create a new set so as not to alter the incoming parameter.
//
//  Assumption: the input stream has been restored to the starting point
//  prediction, which is where predicates need to evaluate.
//
ParserATNSimulator.prototype.splitAccordingToSemanticValidity = function( configs, outerContext) {
    var succeeded = new ATNConfigSet(configs.fullCtx);
    var failed = new ATNConfigSet(configs.fullCtx);
    for(var i=0;i<configs.items.length; i++) {
        var c = configs.items[i];
        if (c.semanticContext !== SemanticContext.NONE) {
            var predicateEvaluationResult = c.semanticContext.evaluate(this.parser, outerContext);
            if (predicateEvaluationResult) {
                succeeded.add(c);
            } else {
                failed.add(c);
            }
        } else {
            succeeded.add(c);
        }
    }
    return [succeeded, failed];
};

// Look through a list of predicate/alt pairs, returning alts for the
//  pairs that win. A {@code NONE} predicate indicates an alt containing an
//  unpredicated config which behaves as "always true." If !complete
//  then we stop at the first predicate that evaluates to true. This
//  includes pairs with null predicates.
//
ParserATNSimulator.prototype.evalSemanticContext = function(predPredictions, outerContext, complete) {
    var predictions = new BitSet();
    for(var i=0;i<predPredictions.length;i++) {
    	var pair = predPredictions[i];
        if (pair.pred === SemanticContext.NONE) {
            predictions.add(pair.alt);
            if (! complete) {
                break;
            }
            continue;
        }
        var predicateEvaluationResult = pair.pred.evaluate(this.parser, outerContext);
        if (this.debug || this.dfa_debug) {
            console.log("eval pred " + pair + "=" + predicateEvaluationResult);
        }
        if (predicateEvaluationResult) {
            if (this.debug || this.dfa_debug) {
                console.log("PREDICT " + pair.alt);
            }
            predictions.add(pair.alt);
            if (! complete) {
                break;
            }
        }
    }
    return predictions;
};

// TODO: If we are doing predicates, there is no point in pursuing
//     closure operations if we reach a DFA state that uniquely predicts
//     alternative. We will not be caching that DFA state and it is a
//     waste to pursue the closure. Might have to advance when we do
//     ambig detection thought :(
//

ParserATNSimulator.prototype.closure = function(config, configs, closureBusy, collectPredicates, fullCtx, treatEofAsEpsilon) {
    var initialDepth = 0;
    this.closureCheckingStopState(config, configs, closureBusy, collectPredicates,
                             fullCtx, initialDepth, treatEofAsEpsilon);
};


ParserATNSimulator.prototype.closureCheckingStopState = function(config, configs, closureBusy, collectPredicates, fullCtx, depth, treatEofAsEpsilon) {
    if (this.debug || this.debug_closure) {
        console.log("closure(" + config.toString(this.parser,true) + ")");
        // console.log("configs(" + configs.toString() + ")");
        if(config.reachesIntoOuterContext>50) {
            throw "problem";
        }
    }
    if (config.state instanceof RuleStopState) {
        // We hit rule end. If we have context info, use it
        // run thru all possible stack tops in ctx
        if (! config.context.isEmpty()) {
            for ( var i =0; i<config.context.length; i++) {
                if (config.context.getReturnState(i) === PredictionContext.EMPTY_RETURN_STATE) {
                    if (fullCtx) {
                        configs.add(new ATNConfig({state:config.state, context:PredictionContext.EMPTY}, config), this.mergeCache);
                        continue;
                    } else {
                        // we have no context info, just chase follow links (if greedy)
                        if (this.debug) {
                            console.log("FALLING off rule " + this.getRuleName(config.state.ruleIndex));
                        }
                        this.closure_(config, configs, closureBusy, collectPredicates,
                                 fullCtx, depth, treatEofAsEpsilon);
                    }
                    continue;
                }
                var returnState = this.atn.states[config.context.getReturnState(i)];
                var newContext = config.context.getParent(i); // "pop" return state
                var parms = {state:returnState, alt:config.alt, context:newContext, semanticContext:config.semanticContext};
                var c = new ATNConfig(parms, null);
                // While we have context to pop back from, we may have
                // gotten that context AFTER having falling off a rule.
                // Make sure we track that we are now out of context.
                c.reachesIntoOuterContext = config.reachesIntoOuterContext;
                this.closureCheckingStopState(c, configs, closureBusy, collectPredicates, fullCtx, depth - 1, treatEofAsEpsilon);
            }
            return;
        } else if( fullCtx) {
            // reached end of start rule
            configs.add(config, this.mergeCache);
            return;
        } else {
            // else if we have no context info, just chase follow links (if greedy)
            if (this.debug) {
                console.log("FALLING off rule " + this.getRuleName(config.state.ruleIndex));
            }
        }
    }
    this.closure_(config, configs, closureBusy, collectPredicates, fullCtx, depth, treatEofAsEpsilon);
};


// Do the actual work of walking epsilon edges//
ParserATNSimulator.prototype.closure_ = function(config, configs, closureBusy, collectPredicates, fullCtx, depth, treatEofAsEpsilon) {
    var p = config.state;
    // optimization
    if (! p.epsilonOnlyTransitions) {
        configs.add(config, this.mergeCache);
        // make sure to not return here, because EOF transitions can act as
        // both epsilon transitions and non-epsilon transitions.
    }
    for(var i = 0;i<p.transitions.length; i++) {
        if(i==0 && this.canDropLoopEntryEdgeInLeftRecursiveRule(config))
            continue;

        var t = p.transitions[i];
        var continueCollecting = collectPredicates && !(t instanceof ActionTransition);
        var c = this.getEpsilonTarget(config, t, continueCollecting, depth === 0, fullCtx, treatEofAsEpsilon);
        if (c!==null) {
            var newDepth = depth;
            if ( config.state instanceof RuleStopState) {
                // target fell off end of rule; mark resulting c as having dipped into outer context
                // We can't get here if incoming config was rule stop and we had context
                // track how far we dip into outer context.  Might
                // come in handy and we avoid evaluating context dependent
                // preds if this is > 0.
				if (this._dfa !== null && this._dfa.precedenceDfa) {
					if (t.outermostPrecedenceReturn === this._dfa.atnStartState.ruleIndex) {
						c.precedenceFilterSuppressed = true;
					}
				}

                c.reachesIntoOuterContext += 1;
                if (closureBusy.add(c)!==c) {
                    // avoid infinite recursion for right-recursive rules
                    continue;
                }
                configs.dipsIntoOuterContext = true; // TODO: can remove? only care when we add to set per middle of this method
                newDepth -= 1;
                if (this.debug) {
                    console.log("dips into outer ctx: " + c);
                }
            } else {
                if (!t.isEpsilon && closureBusy.add(c)!==c){
                    // avoid infinite recursion for EOF* and EOF+
                    continue;
                }
                if (t instanceof RuleTransition) {
                    // latch when newDepth goes negative - once we step out of the entry context we can't return
                    if (newDepth >= 0) {
                        newDepth += 1;
                    }
                }
            }
            this.closureCheckingStopState(c, configs, closureBusy, continueCollecting, fullCtx, newDepth, treatEofAsEpsilon);
        }
    }
};


ParserATNSimulator.prototype.canDropLoopEntryEdgeInLeftRecursiveRule = function(config) {
    // return False
    var p = config.state;
    // First check to see if we are in StarLoopEntryState generated during
    // left-recursion elimination. For efficiency, also check if
    // the context has an empty stack case. If so, it would mean
    // global FOLLOW so we can't perform optimization
    // Are we the special loop entry/exit state? or SLL wildcard
    if(p.stateType != ATNState.STAR_LOOP_ENTRY)
        return false;
    if(p.stateType != ATNState.STAR_LOOP_ENTRY || !p.isPrecedenceDecision ||
           config.context.isEmpty() || config.context.hasEmptyPath())
        return false;

    // Require all return states to return back to the same rule that p is in.
    var numCtxs = config.context.length;
    for(var i=0; i<numCtxs; i++) { // for each stack context
        var returnState = this.atn.states[config.context.getReturnState(i)];
        if (returnState.ruleIndex != p.ruleIndex)
            return false;
    }

    var decisionStartState = p.transitions[0].target;
    var blockEndStateNum = decisionStartState.endState.stateNumber;
    var blockEndState = this.atn.states[blockEndStateNum];

    // Verify that the top of each stack context leads to loop entry/exit
    // state through epsilon edges and w/o leaving rule.
    for(var i=0; i<numCtxs; i++) { // for each stack context
        var returnStateNumber = config.context.getReturnState(i);
        var returnState = this.atn.states[returnStateNumber];
        // all states must have single outgoing epsilon edge
        if (returnState.transitions.length != 1 || !returnState.transitions[0].isEpsilon)
            return false;

        // Look for prefix op case like 'not expr', (' type ')' expr
        var returnStateTarget = returnState.transitions[0].target;
        if ( returnState.stateType == ATNState.BLOCK_END && returnStateTarget == p )
            continue;

        // Look for 'expr op expr' or case where expr's return state is block end
        // of (...)* internal block; the block end points to loop back
        // which points to p but we don't need to check that
        if ( returnState == blockEndState )
            continue;

        // Look for ternary expr ? expr : expr. The return state points at block end,
        // which points at loop entry state
        if ( returnStateTarget == blockEndState )
            continue;

        // Look for complex prefix 'between expr and expr' case where 2nd expr's
        // return state points at block end state of (...)* internal block
        if (returnStateTarget.stateType == ATNState.BLOCK_END && returnStateTarget.transitions.length == 1
                && returnStateTarget.transitions[0].isEpsilon && returnStateTarget.transitions[0].target == p)
            continue;

        // anything else ain't conforming
        return false;
    }
    return true;
};


ParserATNSimulator.prototype.getRuleName = function( index) {
    if (this.parser!==null && index>=0) {
        return this.parser.ruleNames[index];
    } else {
        return "<rule " + index + ">";
    }
};

ParserATNSimulator.prototype.getEpsilonTarget = function(config, t, collectPredicates, inContext, fullCtx, treatEofAsEpsilon) {
    switch(t.serializationType) {
    case Transition.RULE:
        return this.ruleTransition(config, t);
    case Transition.PRECEDENCE:
        return this.precedenceTransition(config, t, collectPredicates, inContext, fullCtx);
    case Transition.PREDICATE:
        return this.predTransition(config, t, collectPredicates, inContext, fullCtx);
    case Transition.ACTION:
        return this.actionTransition(config, t);
    case Transition.EPSILON:
        return new ATNConfig({state:t.target}, config);
    case Transition.ATOM:
    case Transition.RANGE:
    case Transition.SET:
        // EOF transitions act like epsilon transitions after the first EOF
        // transition is traversed
        if (treatEofAsEpsilon) {
            if (t.matches(Token.EOF, 0, 1)) {
                return new ATNConfig({state: t.target}, config);
            }
        }
        return null;
    default:
    	return null;
    }
};

ParserATNSimulator.prototype.actionTransition = function(config, t) {
    if (this.debug) {
        var index = t.actionIndex==-1 ? 65535 : t.actionIndex;
        console.log("ACTION edge " + t.ruleIndex + ":" + index);
    }
    return new ATNConfig({state:t.target}, config);
};

ParserATNSimulator.prototype.precedenceTransition = function(config, pt,  collectPredicates, inContext, fullCtx) {
    if (this.debug) {
        console.log("PRED (collectPredicates=" + collectPredicates + ") " +
                pt.precedence + ">=_p, ctx dependent=true");
        if (this.parser!==null) {
        	console.log("context surrounding pred is " + Utils.arrayToString(this.parser.getRuleInvocationStack()));
        }
    }
    var c = null;
    if (collectPredicates && inContext) {
        if (fullCtx) {
            // In full context mode, we can evaluate predicates on-the-fly
            // during closure, which dramatically reduces the size of
            // the config sets. It also obviates the need to test predicates
            // later during conflict resolution.
            var currentPosition = this._input.index;
            this._input.seek(this._startIndex);
            var predSucceeds = pt.getPredicate().evaluate(this.parser, this._outerContext);
            this._input.seek(currentPosition);
            if (predSucceeds) {
                c = new ATNConfig({state:pt.target}, config); // no pred context
            }
        } else {
            var newSemCtx = SemanticContext.andContext(config.semanticContext, pt.getPredicate());
            c = new ATNConfig({state:pt.target, semanticContext:newSemCtx}, config);
        }
    } else {
        c = new ATNConfig({state:pt.target}, config);
    }
    if (this.debug) {
        console.log("config from pred transition=" + c);
    }
    return c;
};

ParserATNSimulator.prototype.predTransition = function(config, pt, collectPredicates, inContext, fullCtx) {
    if (this.debug) {
        console.log("PRED (collectPredicates=" + collectPredicates + ") " + pt.ruleIndex +
                ":" + pt.predIndex + ", ctx dependent=" + pt.isCtxDependent);
        if (this.parser!==null) {
            console.log("context surrounding pred is " + Utils.arrayToString(this.parser.getRuleInvocationStack()));
        }
    }
    var c = null;
    if (collectPredicates && ((pt.isCtxDependent && inContext) || ! pt.isCtxDependent)) {
        if (fullCtx) {
            // In full context mode, we can evaluate predicates on-the-fly
            // during closure, which dramatically reduces the size of
            // the config sets. It also obviates the need to test predicates
            // later during conflict resolution.
            var currentPosition = this._input.index;
            this._input.seek(this._startIndex);
            var predSucceeds = pt.getPredicate().evaluate(this.parser, this._outerContext);
            this._input.seek(currentPosition);
            if (predSucceeds) {
                c = new ATNConfig({state:pt.target}, config); // no pred context
            }
        } else {
            var newSemCtx = SemanticContext.andContext(config.semanticContext, pt.getPredicate());
            c = new ATNConfig({state:pt.target, semanticContext:newSemCtx}, config);
        }
    } else {
        c = new ATNConfig({state:pt.target}, config);
    }
    if (this.debug) {
        console.log("config from pred transition=" + c);
    }
    return c;
};

ParserATNSimulator.prototype.ruleTransition = function(config, t) {
    if (this.debug) {
        console.log("CALL rule " + this.getRuleName(t.target.ruleIndex) + ", ctx=" + config.context);
    }
    var returnState = t.followState;
    var newContext = SingletonPredictionContext.create(config.context, returnState.stateNumber);
    return new ATNConfig({state:t.target, context:newContext}, config );
};

ParserATNSimulator.prototype.getConflictingAlts = function(configs) {
    var altsets = PredictionMode.getConflictingAltSubsets(configs);
    return PredictionMode.getAlts(altsets);
};

 // Sam pointed out a problem with the previous definition, v3, of
 // ambiguous states. If we have another state associated with conflicting
 // alternatives, we should keep going. For example, the following grammar
 //
 // s : (ID | ID ID?) ';' ;
 //
 // When the ATN simulation reaches the state before ';', it has a DFA
 // state that looks like: [12|1|[], 6|2|[], 12|2|[]]. Naturally
 // 12|1|[] and 12|2|[] conflict, but we cannot stop processing this node
 // because alternative to has another way to continue, via [6|2|[]].
 // The key is that we have a single state that has config's only associated
 // with a single alternative, 2, and crucially the state transitions
 // among the configurations are all non-epsilon transitions. That means
 // we don't consider any conflicts that include alternative 2. So, we
 // ignore the conflict between alts 1 and 2. We ignore a set of
 // conflicting alts when there is an intersection with an alternative
 // associated with a single alt state in the state&rarr;config-list map.
 //
 // It's also the case that we might have two conflicting configurations but
 // also a 3rd nonconflicting configuration for a different alternative:
 // [1|1|[], 1|2|[], 8|3|[]]. This can come about from grammar:
 //
 // a : A | A | A B ;
 //
 // After matching input A, we reach the stop state for rule A, state 1.
 // State 8 is the state right before B. Clearly alternatives 1 and 2
 // conflict and no amount of further lookahead will separate the two.
 // However, alternative 3 will be able to continue and so we do not
 // stop working on this state. In the previous example, we're concerned
 // with states associated with the conflicting alternatives. Here alt
 // 3 is not associated with the conflicting configs, but since we can continue
 // looking for input reasonably, I don't declare the state done. We
 // ignore a set of conflicting alts when we have an alternative
 // that we still need to pursue.
//

ParserATNSimulator.prototype.getConflictingAltsOrUniqueAlt = function(configs) {
    var conflictingAlts = null;
    if (configs.uniqueAlt!== ATN.INVALID_ALT_NUMBER) {
        conflictingAlts = new BitSet();
        conflictingAlts.add(configs.uniqueAlt);
    } else {
        conflictingAlts = configs.conflictingAlts;
    }
    return conflictingAlts;
};

ParserATNSimulator.prototype.getTokenName = function( t) {
    if (t===Token.EOF) {
        return "EOF";
    }
    if( this.parser!==null && this.parser.literalNames!==null) {
        if (t >= this.parser.literalNames.length && t >= this.parser.symbolicNames.length) {
            console.log("" + t + " ttype out of range: " + this.parser.literalNames);
            console.log("" + this.parser.getInputStream().getTokens());
        } else {
            var name = this.parser.literalNames[t] || this.parser.symbolicNames[t];
            return name + "<" + t + ">";
        }
    }
    return "" + t;
};

ParserATNSimulator.prototype.getLookaheadName = function(input) {
    return this.getTokenName(input.LA(1));
};

// Used for debugging in adaptivePredict around execATN but I cut
//  it out for clarity now that alg. works well. We can leave this
//  "dead" code for a bit.
//
ParserATNSimulator.prototype.dumpDeadEndConfigs = function(nvae) {
    console.log("dead end configs: ");
    var decs = nvae.getDeadEndConfigs();
    for(var i=0; i<decs.length; i++) {
    	var c = decs[i];
        var trans = "no edges";
        if (c.state.transitions.length>0) {
            var t = c.state.transitions[0];
            if (t instanceof AtomTransition) {
                trans = "Atom "+ this.getTokenName(t.label);
            } else if (t instanceof SetTransition) {
                var neg = (t instanceof NotSetTransition);
                trans = (neg ? "~" : "") + "Set " + t.set;
            }
        }
        console.error(c.toString(this.parser, true) + ":" + trans);
    }
};

ParserATNSimulator.prototype.noViableAlt = function(input, outerContext, configs, startIndex) {
    return new NoViableAltException(this.parser, input, input.get(startIndex), input.LT(1), configs, outerContext);
};

ParserATNSimulator.prototype.getUniqueAlt = function(configs) {
    var alt = ATN.INVALID_ALT_NUMBER;
    for(var i=0;i<configs.items.length;i++) {
    	var c = configs.items[i];
        if (alt === ATN.INVALID_ALT_NUMBER) {
            alt = c.alt // found first alt
        } else if( c.alt!==alt) {
            return ATN.INVALID_ALT_NUMBER;
        }
    }
    return alt;
};

//
// Add an edge to the DFA, if possible. This method calls
// {@link //addDFAState} to ensure the {@code to} state is present in the
// DFA. If {@code from} is {@code null}, or if {@code t} is outside the
// range of edges that can be represented in the DFA tables, this method
// returns without adding the edge to the DFA.
//
// <p>If {@code to} is {@code null}, this method returns {@code null}.
// Otherwise, this method returns the {@link DFAState} returned by calling
// {@link //addDFAState} for the {@code to} state.</p>
//
// @param dfa The DFA
// @param from The source state for the edge
// @param t The input symbol
// @param to The target state for the edge
//
// @return If {@code to} is {@code null}, this method returns {@code null};
// otherwise this method returns the result of calling {@link //addDFAState}
// on {@code to}
//
ParserATNSimulator.prototype.addDFAEdge = function(dfa, from_, t, to) {
    if( this.debug) {
        console.log("EDGE " + from_ + " -> " + to + " upon " + this.getTokenName(t));
    }
    if (to===null) {
        return null;
    }
    to = this.addDFAState(dfa, to); // used existing if possible not incoming
    if (from_===null || t < -1 || t > this.atn.maxTokenType) {
        return to;
    }
    if (from_.edges===null) {
        from_.edges = [];
    }
    from_.edges[t+1] = to; // connect

    if (this.debug) {
        var literalNames = this.parser===null ? null : this.parser.literalNames;
        var symbolicNames = this.parser===null ? null : this.parser.symbolicNames;
        console.log("DFA=\n" + dfa.toString(literalNames, symbolicNames));
    }
    return to;
};
//
// Add state {@code D} to the DFA if it is not already present, and return
// the actual instance stored in the DFA. If a state equivalent to {@code D}
// is already in the DFA, the existing state is returned. Otherwise this
// method returns {@code D} after adding it to the DFA.
//
// <p>If {@code D} is {@link //ERROR}, this method returns {@link //ERROR} and
// does not change the DFA.</p>
//
// @param dfa The dfa
// @param D The DFA state to add
// @return The state stored in the DFA. This will be either the existing
// state if {@code D} is already in the DFA, or {@code D} itself if the
// state was not already present.
//
ParserATNSimulator.prototype.addDFAState = function(dfa, D) {
    if (D == ATNSimulator.ERROR) {
        return D;
    }
    var existing = dfa.states.get(D);
    if(existing!==null) {
        return existing;
    }
    D.stateNumber = dfa.states.length;
    if (! D.configs.readOnly) {
        D.configs.optimizeConfigs(this);
        D.configs.setReadonly(true);
    }
    dfa.states.add(D);
    if (this.debug) {
        console.log("adding new DFA state: " + D);
    }
    return D;
};

ParserATNSimulator.prototype.reportAttemptingFullContext = function(dfa, conflictingAlts, configs, startIndex, stopIndex) {
    if (this.debug || this.retry_debug) {
        var interval = new Interval(startIndex, stopIndex + 1);
        console.log("reportAttemptingFullContext decision=" + dfa.decision + ":" + configs +
                           ", input=" + this.parser.getTokenStream().getText(interval));
    }
    if (this.parser!==null) {
        this.parser.getErrorListenerDispatch().reportAttemptingFullContext(this.parser, dfa, startIndex, stopIndex, conflictingAlts, configs);
    }
};

ParserATNSimulator.prototype.reportContextSensitivity = function(dfa, prediction, configs, startIndex, stopIndex) {
    if (this.debug || this.retry_debug) {
        var interval = new Interval(startIndex, stopIndex + 1);
        console.log("reportContextSensitivity decision=" + dfa.decision + ":" + configs +
                           ", input=" + this.parser.getTokenStream().getText(interval));
    }
    if (this.parser!==null) {
        this.parser.getErrorListenerDispatch().reportContextSensitivity(this.parser, dfa, startIndex, stopIndex, prediction, configs);
    }
};

// If context sensitive parsing, we know it's ambiguity not conflict//
ParserATNSimulator.prototype.reportAmbiguity = function(dfa, D, startIndex, stopIndex,
                               exact, ambigAlts, configs ) {
    if (this.debug || this.retry_debug) {
        var interval = new Interval(startIndex, stopIndex + 1);
        console.log("reportAmbiguity " + ambigAlts + ":" + configs +
                           ", input=" + this.parser.getTokenStream().getText(interval));
    }
    if (this.parser!==null) {
        this.parser.getErrorListenerDispatch().reportAmbiguity(this.parser, dfa, startIndex, stopIndex, exact, ambigAlts, configs);
    }
};

exports.ParserATNSimulator = ParserATNSimulator;

/***/ }),

/***/ "./node_modules/antlr4/atn/PredictionMode.js":
/*!***************************************************!*\
  !*** ./node_modules/antlr4/atn/PredictionMode.js ***!
  \***************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
//
//
// This enumeration defines the prediction modes available in ANTLR 4 along with
// utility methods for analyzing configuration sets for conflicts and/or
// ambiguities.

var Set = __webpack_require__(/*! ./../Utils */ "./node_modules/antlr4/Utils.js").Set;
var Map = __webpack_require__(/*! ./../Utils */ "./node_modules/antlr4/Utils.js").Map;
var BitSet = __webpack_require__(/*! ./../Utils */ "./node_modules/antlr4/Utils.js").BitSet;
var AltDict = __webpack_require__(/*! ./../Utils */ "./node_modules/antlr4/Utils.js").AltDict;
var ATN = __webpack_require__(/*! ./ATN */ "./node_modules/antlr4/atn/ATN.js").ATN;
var RuleStopState = __webpack_require__(/*! ./ATNState */ "./node_modules/antlr4/atn/ATNState.js").RuleStopState;
var ATNConfigSet = __webpack_require__(/*! ./ATNConfigSet */ "./node_modules/antlr4/atn/ATNConfigSet.js").ATNConfigSet;
var ATNConfig = __webpack_require__(/*! ./ATNConfig */ "./node_modules/antlr4/atn/ATNConfig.js").ATNConfig;
var SemanticContext = __webpack_require__(/*! ./SemanticContext */ "./node_modules/antlr4/atn/SemanticContext.js").SemanticContext;
var Hash = __webpack_require__(/*! ../Utils */ "./node_modules/antlr4/Utils.js").Hash;
var hashStuff = __webpack_require__(/*! ./../Utils */ "./node_modules/antlr4/Utils.js").hashStuff;
var equalArrays = __webpack_require__(/*! ./../Utils */ "./node_modules/antlr4/Utils.js").equalArrays;

function PredictionMode() {
	return this;
}

//
// The SLL(*) prediction mode. This prediction mode ignores the current
// parser context when making predictions. This is the fastest prediction
// mode, and provides correct results for many grammars. This prediction
// mode is more powerful than the prediction mode provided by ANTLR 3, but
// may result in syntax errors for grammar and input combinations which are
// not SLL.
//
// <p>
// When using this prediction mode, the parser will either return a correct
// parse tree (i.e. the same parse tree that would be returned with the
// {@link //LL} prediction mode), or it will report a syntax error. If a
// syntax error is encountered when using the {@link //SLL} prediction mode,
// it may be due to either an actual syntax error in the input or indicate
// that the particular combination of grammar and input requires the more
// powerful {@link //LL} prediction abilities to complete successfully.</p>
//
// <p>
// This prediction mode does not provide any guarantees for prediction
// behavior for syntactically-incorrect inputs.</p>
//
PredictionMode.SLL = 0;
//
// The LL(*) prediction mode. This prediction mode allows the current parser
// context to be used for resolving SLL conflicts that occur during
// prediction. This is the fastest prediction mode that guarantees correct
// parse results for all combinations of grammars with syntactically correct
// inputs.
//
// <p>
// When using this prediction mode, the parser will make correct decisions
// for all syntactically-correct grammar and input combinations. However, in
// cases where the grammar is truly ambiguous this prediction mode might not
// report a precise answer for <em>exactly which</em> alternatives are
// ambiguous.</p>
//
// <p>
// This prediction mode does not provide any guarantees for prediction
// behavior for syntactically-incorrect inputs.</p>
//
PredictionMode.LL = 1;
//
// The LL(*) prediction mode with exact ambiguity detection. In addition to
// the correctness guarantees provided by the {@link //LL} prediction mode,
// this prediction mode instructs the prediction algorithm to determine the
// complete and exact set of ambiguous alternatives for every ambiguous
// decision encountered while parsing.
//
// <p>
// This prediction mode may be used for diagnosing ambiguities during
// grammar development. Due to the performance overhead of calculating sets
// of ambiguous alternatives, this prediction mode should be avoided when
// the exact results are not necessary.</p>
//
// <p>
// This prediction mode does not provide any guarantees for prediction
// behavior for syntactically-incorrect inputs.</p>
//
PredictionMode.LL_EXACT_AMBIG_DETECTION = 2;


//
// Computes the SLL prediction termination condition.
//
// <p>
// This method computes the SLL prediction termination condition for both of
// the following cases.</p>
//
// <ul>
// <li>The usual SLL+LL fallback upon SLL conflict</li>
// <li>Pure SLL without LL fallback</li>
// </ul>
//
// <p><strong>COMBINED SLL+LL PARSING</strong></p>
//
// <p>When LL-fallback is enabled upon SLL conflict, correct predictions are
// ensured regardless of how the termination condition is computed by this
// method. Due to the substantially higher cost of LL prediction, the
// prediction should only fall back to LL when the additional lookahead
// cannot lead to a unique SLL prediction.</p>
//
// <p>Assuming combined SLL+LL parsing, an SLL configuration set with only
// conflicting subsets should fall back to full LL, even if the
// configuration sets don't resolve to the same alternative (e.g.
// {@code {1,2}} and {@code {3,4}}. If there is at least one non-conflicting
// configuration, SLL could continue with the hopes that more lookahead will
// resolve via one of those non-conflicting configurations.</p>
//
// <p>Here's the prediction termination rule them: SLL (for SLL+LL parsing)
// stops when it sees only conflicting configuration subsets. In contrast,
// full LL keeps going when there is uncertainty.</p>
//
// <p><strong>HEURISTIC</strong></p>
//
// <p>As a heuristic, we stop prediction when we see any conflicting subset
// unless we see a state that only has one alternative associated with it.
// The single-alt-state thing lets prediction continue upon rules like
// (otherwise, it would admit defeat too soon):</p>
//
// <p>{@code [12|1|[], 6|2|[], 12|2|[]]. s : (ID | ID ID?) ';' ;}</p>
//
// <p>When the ATN simulation reaches the state before {@code ';'}, it has a
// DFA state that looks like: {@code [12|1|[], 6|2|[], 12|2|[]]}. Naturally
// {@code 12|1|[]} and {@code 12|2|[]} conflict, but we cannot stop
// processing this node because alternative to has another way to continue,
// via {@code [6|2|[]]}.</p>
//
// <p>It also let's us continue for this rule:</p>
//
// <p>{@code [1|1|[], 1|2|[], 8|3|[]] a : A | A | A B ;}</p>
//
// <p>After matching input A, we reach the stop state for rule A, state 1.
// State 8 is the state right before B. Clearly alternatives 1 and 2
// conflict and no amount of further lookahead will separate the two.
// However, alternative 3 will be able to continue and so we do not stop
// working on this state. In the previous example, we're concerned with
// states associated with the conflicting alternatives. Here alt 3 is not
// associated with the conflicting configs, but since we can continue
// looking for input reasonably, don't declare the state done.</p>
//
// <p><strong>PURE SLL PARSING</strong></p>
//
// <p>To handle pure SLL parsing, all we have to do is make sure that we
// combine stack contexts for configurations that differ only by semantic
// predicate. From there, we can do the usual SLL termination heuristic.</p>
//
// <p><strong>PREDICATES IN SLL+LL PARSING</strong></p>
//
// <p>SLL decisions don't evaluate predicates until after they reach DFA stop
// states because they need to create the DFA cache that works in all
// semantic situations. In contrast, full LL evaluates predicates collected
// during start state computation so it can ignore predicates thereafter.
// This means that SLL termination detection can totally ignore semantic
// predicates.</p>
//
// <p>Implementation-wise, {@link ATNConfigSet} combines stack contexts but not
// semantic predicate contexts so we might see two configurations like the
// following.</p>
//
// <p>{@code (s, 1, x, {}), (s, 1, x', {p})}</p>
//
// <p>Before testing these configurations against others, we have to merge
// {@code x} and {@code x'} (without modifying the existing configurations).
// For example, we test {@code (x+x')==x''} when looking for conflicts in
// the following configurations.</p>
//
// <p>{@code (s, 1, x, {}), (s, 1, x', {p}), (s, 2, x'', {})}</p>
//
// <p>If the configuration set has predicates (as indicated by
// {@link ATNConfigSet//hasSemanticContext}), this algorithm makes a copy of
// the configurations to strip out all of the predicates so that a standard
// {@link ATNConfigSet} will merge everything ignoring predicates.</p>
//
PredictionMode.hasSLLConflictTerminatingPrediction = function( mode, configs) {
    // Configs in rule stop states indicate reaching the end of the decision
    // rule (local context) or end of start rule (full context). If all
    // configs meet this condition, then none of the configurations is able
    // to match additional input so we terminate prediction.
    //
    if (PredictionMode.allConfigsInRuleStopStates(configs)) {
        return true;
    }
    // pure SLL mode parsing
    if (mode === PredictionMode.SLL) {
        // Don't bother with combining configs from different semantic
        // contexts if we can fail over to full LL; costs more time
        // since we'll often fail over anyway.
        if (configs.hasSemanticContext) {
            // dup configs, tossing out semantic predicates
            var dup = new ATNConfigSet();
            for(var i=0;i<configs.items.length;i++) {
            	var c = configs.items[i];
                c = new ATNConfig({semanticContext:SemanticContext.NONE}, c);
                dup.add(c);
            }
            configs = dup;
        }
        // now we have combined contexts for configs with dissimilar preds
    }
    // pure SLL or combined SLL+LL mode parsing
    var altsets = PredictionMode.getConflictingAltSubsets(configs);
    return PredictionMode.hasConflictingAltSet(altsets) && !PredictionMode.hasStateAssociatedWithOneAlt(configs);
};

// Checks if any configuration in {@code configs} is in a
// {@link RuleStopState}. Configurations meeting this condition have reached
// the end of the decision rule (local context) or end of start rule (full
// context).
//
// @param configs the configuration set to test
// @return {@code true} if any configuration in {@code configs} is in a
// {@link RuleStopState}, otherwise {@code false}
PredictionMode.hasConfigInRuleStopState = function(configs) {
	for(var i=0;i<configs.items.length;i++) {
		var c = configs.items[i];
        if (c.state instanceof RuleStopState) {
            return true;
        }
	}
    return false;
};

// Checks if all configurations in {@code configs} are in a
// {@link RuleStopState}. Configurations meeting this condition have reached
// the end of the decision rule (local context) or end of start rule (full
// context).
//
// @param configs the configuration set to test
// @return {@code true} if all configurations in {@code configs} are in a
// {@link RuleStopState}, otherwise {@code false}
PredictionMode.allConfigsInRuleStopStates = function(configs) {
	for(var i=0;i<configs.items.length;i++) {
		var c = configs.items[i];
        if (!(c.state instanceof RuleStopState)) {
            return false;
        }
	}
    return true;
};

//
// Full LL prediction termination.
//
// <p>Can we stop looking ahead during ATN simulation or is there some
// uncertainty as to which alternative we will ultimately pick, after
// consuming more input? Even if there are partial conflicts, we might know
// that everything is going to resolve to the same minimum alternative. That
// means we can stop since no more lookahead will change that fact. On the
// other hand, there might be multiple conflicts that resolve to different
// minimums. That means we need more look ahead to decide which of those
// alternatives we should predict.</p>
//
// <p>The basic idea is to split the set of configurations {@code C}, into
// conflicting subsets {@code (s, _, ctx, _)} and singleton subsets with
// non-conflicting configurations. Two configurations conflict if they have
// identical {@link ATNConfig//state} and {@link ATNConfig//context} values
// but different {@link ATNConfig//alt} value, e.g. {@code (s, i, ctx, _)}
// and {@code (s, j, ctx, _)} for {@code i!=j}.</p>
//
// <p>Reduce these configuration subsets to the set of possible alternatives.
// You can compute the alternative subsets in one pass as follows:</p>
//
// <p>{@code A_s,ctx = {i | (s, i, ctx, _)}} for each configuration in
// {@code C} holding {@code s} and {@code ctx} fixed.</p>
//
// <p>Or in pseudo-code, for each configuration {@code c} in {@code C}:</p>
//
// <pre>
// map[c] U= c.{@link ATNConfig//alt alt} // map hash/equals uses s and x, not
// alt and not pred
// </pre>
//
// <p>The values in {@code map} are the set of {@code A_s,ctx} sets.</p>
//
// <p>If {@code |A_s,ctx|=1} then there is no conflict associated with
// {@code s} and {@code ctx}.</p>
//
// <p>Reduce the subsets to singletons by choosing a minimum of each subset. If
// the union of these alternative subsets is a singleton, then no amount of
// more lookahead will help us. We will always pick that alternative. If,
// however, there is more than one alternative, then we are uncertain which
// alternative to predict and must continue looking for resolution. We may
// or may not discover an ambiguity in the future, even if there are no
// conflicting subsets this round.</p>
//
// <p>The biggest sin is to terminate early because it means we've made a
// decision but were uncertain as to the eventual outcome. We haven't used
// enough lookahead. On the other hand, announcing a conflict too late is no
// big deal; you will still have the conflict. It's just inefficient. It
// might even look until the end of file.</p>
//
// <p>No special consideration for semantic predicates is required because
// predicates are evaluated on-the-fly for full LL prediction, ensuring that
// no configuration contains a semantic context during the termination
// check.</p>
//
// <p><strong>CONFLICTING CONFIGS</strong></p>
//
// <p>Two configurations {@code (s, i, x)} and {@code (s, j, x')}, conflict
// when {@code i!=j} but {@code x=x'}. Because we merge all
// {@code (s, i, _)} configurations together, that means that there are at
// most {@code n} configurations associated with state {@code s} for
// {@code n} possible alternatives in the decision. The merged stacks
// complicate the comparison of configuration contexts {@code x} and
// {@code x'}. Sam checks to see if one is a subset of the other by calling
// merge and checking to see if the merged result is either {@code x} or
// {@code x'}. If the {@code x} associated with lowest alternative {@code i}
// is the superset, then {@code i} is the only possible prediction since the
// others resolve to {@code min(i)} as well. However, if {@code x} is
// associated with {@code j>i} then at least one stack configuration for
// {@code j} is not in conflict with alternative {@code i}. The algorithm
// should keep going, looking for more lookahead due to the uncertainty.</p>
//
// <p>For simplicity, I'm doing a equality check between {@code x} and
// {@code x'} that lets the algorithm continue to consume lookahead longer
// than necessary. The reason I like the equality is of course the
// simplicity but also because that is the test you need to detect the
// alternatives that are actually in conflict.</p>
//
// <p><strong>CONTINUE/STOP RULE</strong></p>
//
// <p>Continue if union of resolved alternative sets from non-conflicting and
// conflicting alternative subsets has more than one alternative. We are
// uncertain about which alternative to predict.</p>
//
// <p>The complete set of alternatives, {@code [i for (_,i,_)]}, tells us which
// alternatives are still in the running for the amount of input we've
// consumed at this point. The conflicting sets let us to strip away
// configurations that won't lead to more states because we resolve
// conflicts to the configuration with a minimum alternate for the
// conflicting set.</p>
//
// <p><strong>CASES</strong></p>
//
// <ul>
//
// <li>no conflicts and more than 1 alternative in set =&gt; continue</li>
//
// <li> {@code (s, 1, x)}, {@code (s, 2, x)}, {@code (s, 3, z)},
// {@code (s', 1, y)}, {@code (s', 2, y)} yields non-conflicting set
// {@code {3}} U conflicting sets {@code min({1,2})} U {@code min({1,2})} =
// {@code {1,3}} =&gt; continue
// </li>
//
// <li>{@code (s, 1, x)}, {@code (s, 2, x)}, {@code (s', 1, y)},
// {@code (s', 2, y)}, {@code (s'', 1, z)} yields non-conflicting set
// {@code {1}} U conflicting sets {@code min({1,2})} U {@code min({1,2})} =
// {@code {1}} =&gt; stop and predict 1</li>
//
// <li>{@code (s, 1, x)}, {@code (s, 2, x)}, {@code (s', 1, y)},
// {@code (s', 2, y)} yields conflicting, reduced sets {@code {1}} U
// {@code {1}} = {@code {1}} =&gt; stop and predict 1, can announce
// ambiguity {@code {1,2}}</li>
//
// <li>{@code (s, 1, x)}, {@code (s, 2, x)}, {@code (s', 2, y)},
// {@code (s', 3, y)} yields conflicting, reduced sets {@code {1}} U
// {@code {2}} = {@code {1,2}} =&gt; continue</li>
//
// <li>{@code (s, 1, x)}, {@code (s, 2, x)}, {@code (s', 3, y)},
// {@code (s', 4, y)} yields conflicting, reduced sets {@code {1}} U
// {@code {3}} = {@code {1,3}} =&gt; continue</li>
//
// </ul>
//
// <p><strong>EXACT AMBIGUITY DETECTION</strong></p>
//
// <p>If all states report the same conflicting set of alternatives, then we
// know we have the exact ambiguity set.</p>
//
// <p><code>|A_<em>i</em>|&gt;1</code> and
// <code>A_<em>i</em> = A_<em>j</em></code> for all <em>i</em>, <em>j</em>.</p>
//
// <p>In other words, we continue examining lookahead until all {@code A_i}
// have more than one alternative and all {@code A_i} are the same. If
// {@code A={{1,2}, {1,3}}}, then regular LL prediction would terminate
// because the resolved set is {@code {1}}. To determine what the real
// ambiguity is, we have to know whether the ambiguity is between one and
// two or one and three so we keep going. We can only stop prediction when
// we need exact ambiguity detection when the sets look like
// {@code A={{1,2}}} or {@code {{1,2},{1,2}}}, etc...</p>
//
PredictionMode.resolvesToJustOneViableAlt = function(altsets) {
    return PredictionMode.getSingleViableAlt(altsets);
};

//
// Determines if every alternative subset in {@code altsets} contains more
// than one alternative.
//
// @param altsets a collection of alternative subsets
// @return {@code true} if every {@link BitSet} in {@code altsets} has
// {@link BitSet//cardinality cardinality} &gt; 1, otherwise {@code false}
//
PredictionMode.allSubsetsConflict = function(altsets) {
    return ! PredictionMode.hasNonConflictingAltSet(altsets);
};
//
// Determines if any single alternative subset in {@code altsets} contains
// exactly one alternative.
//
// @param altsets a collection of alternative subsets
// @return {@code true} if {@code altsets} contains a {@link BitSet} with
// {@link BitSet//cardinality cardinality} 1, otherwise {@code false}
//
PredictionMode.hasNonConflictingAltSet = function(altsets) {
	for(var i=0;i<altsets.length;i++) {
		var alts = altsets[i];
        if (alts.length===1) {
            return true;
        }
	}
    return false;
};

//
// Determines if any single alternative subset in {@code altsets} contains
// more than one alternative.
//
// @param altsets a collection of alternative subsets
// @return {@code true} if {@code altsets} contains a {@link BitSet} with
// {@link BitSet//cardinality cardinality} &gt; 1, otherwise {@code false}
//
PredictionMode.hasConflictingAltSet = function(altsets) {
	for(var i=0;i<altsets.length;i++) {
		var alts = altsets[i];
        if (alts.length>1) {
            return true;
        }
	}
    return false;
};

//
// Determines if every alternative subset in {@code altsets} is equivalent.
//
// @param altsets a collection of alternative subsets
// @return {@code true} if every member of {@code altsets} is equal to the
// others, otherwise {@code false}
//
PredictionMode.allSubsetsEqual = function(altsets) {
    var first = null;
	for(var i=0;i<altsets.length;i++) {
		var alts = altsets[i];
        if (first === null) {
            first = alts;
        } else if (alts!==first) {
            return false;
        }
	}
    return true;
};

//
// Returns the unique alternative predicted by all alternative subsets in
// {@code altsets}. If no such alternative exists, this method returns
// {@link ATN//INVALID_ALT_NUMBER}.
//
// @param altsets a collection of alternative subsets
//
PredictionMode.getUniqueAlt = function(altsets) {
    var all = PredictionMode.getAlts(altsets);
    if (all.length===1) {
        return all.minValue();
    } else {
        return ATN.INVALID_ALT_NUMBER;
    }
};

// Gets the complete set of represented alternatives for a collection of
// alternative subsets. This method returns the union of each {@link BitSet}
// in {@code altsets}.
//
// @param altsets a collection of alternative subsets
// @return the set of represented alternatives in {@code altsets}
//
PredictionMode.getAlts = function(altsets) {
    var all = new BitSet();
    altsets.map( function(alts) { all.or(alts); });
    return all;
};

//
// This function gets the conflicting alt subsets from a configuration set.
// For each configuration {@code c} in {@code configs}:
//
// <pre>
// map[c] U= c.{@link ATNConfig//alt alt} // map hash/equals uses s and x, not
// alt and not pred
// </pre>

PredictionMode.getConflictingAltSubsets = function(configs) {
    var configToAlts = new Map();
    configToAlts.hashFunction = function(cfg) { hashStuff(cfg.state.stateNumber, cfg.context); };
    configToAlts.equalsFunction = function(c1, c2) { return c1.state.stateNumber==c2.state.stateNumber && c1.context.equals(c2.context);}
    configs.items.map(function(cfg) {
        var alts = configToAlts.get(cfg);
        if (alts === null) {
            alts = new BitSet();
            configToAlts.put(cfg, alts);
        }
        alts.add(cfg.alt);
	});
    return configToAlts.getValues();
};

//
// Get a map from state to alt subset from a configuration set. For each
// configuration {@code c} in {@code configs}:
//
// <pre>
// map[c.{@link ATNConfig//state state}] U= c.{@link ATNConfig//alt alt}
// </pre>
//
PredictionMode.getStateToAltMap = function(configs) {
    var m = new AltDict();
    configs.items.map(function(c) {
        var alts = m.get(c.state);
        if (alts === null) {
            alts = new BitSet();
            m.put(c.state, alts);
        }
        alts.add(c.alt);
    });
    return m;
};

PredictionMode.hasStateAssociatedWithOneAlt = function(configs) {
    var values = PredictionMode.getStateToAltMap(configs).values();
    for(var i=0;i<values.length;i++) {
        if (values[i].length===1) {
            return true;
        }
    }
    return false;
};

PredictionMode.getSingleViableAlt = function(altsets) {
    var result = null;
	for(var i=0;i<altsets.length;i++) {
		var alts = altsets[i];
        var minAlt = alts.minValue();
        if(result===null) {
            result = minAlt;
        } else if(result!==minAlt) { // more than 1 viable alt
            return ATN.INVALID_ALT_NUMBER;
        }
	}
    return result;
};

exports.PredictionMode = PredictionMode;


/***/ }),

/***/ "./node_modules/antlr4/atn/SemanticContext.js":
/*!****************************************************!*\
  !*** ./node_modules/antlr4/atn/SemanticContext.js ***!
  \****************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
//

// A tree structure used to record the semantic context in which
//  an ATN configuration is valid.  It's either a single predicate,
//  a conjunction {@code p1&&p2}, or a sum of products {@code p1||p2}.
//
//  <p>I have scoped the {@link AND}, {@link OR}, and {@link Predicate} subclasses of
//  {@link SemanticContext} within the scope of this outer class.</p>
//

var Set = __webpack_require__(/*! ./../Utils */ "./node_modules/antlr4/Utils.js").Set;
var Hash = __webpack_require__(/*! ./../Utils */ "./node_modules/antlr4/Utils.js").Hash;

function SemanticContext() {
	return this;
}

SemanticContext.prototype.hashCode = function() {
    var hash = new Hash();
    this.updateHashCode(hash);
    return hash.finish();
};

// For context independent predicates, we evaluate them without a local
// context (i.e., null context). That way, we can evaluate them without
// having to create proper rule-specific context during prediction (as
// opposed to the parser, which creates them naturally). In a practical
// sense, this avoids a cast exception from RuleContext to myruleContext.
//
// <p>For context dependent predicates, we must pass in a local context so that
// references such as $arg evaluate properly as _localctx.arg. We only
// capture context dependent predicates in the context in which we begin
// prediction, so we passed in the outer context here in case of context
// dependent predicate evaluation.</p>
//
SemanticContext.prototype.evaluate = function(parser, outerContext) {
};

//
// Evaluate the precedence predicates for the context and reduce the result.
//
// @param parser The parser instance.
// @param outerContext The current parser context object.
// @return The simplified semantic context after precedence predicates are
// evaluated, which will be one of the following values.
// <ul>
// <li>{@link //NONE}: if the predicate simplifies to {@code true} after
// precedence predicates are evaluated.</li>
// <li>{@code null}: if the predicate simplifies to {@code false} after
// precedence predicates are evaluated.</li>
// <li>{@code this}: if the semantic context is not changed as a result of
// precedence predicate evaluation.</li>
// <li>A non-{@code null} {@link SemanticContext}: the new simplified
// semantic context after precedence predicates are evaluated.</li>
// </ul>
//
SemanticContext.prototype.evalPrecedence = function(parser, outerContext) {
	return this;
};

SemanticContext.andContext = function(a, b) {
	if (a === null || a === SemanticContext.NONE) {
		return b;
	}
	if (b === null || b === SemanticContext.NONE) {
		return a;
	}
	var result = new AND(a, b);
	if (result.opnds.length === 1) {
		return result.opnds[0];
	} else {
		return result;
	}
};

SemanticContext.orContext = function(a, b) {
	if (a === null) {
		return b;
	}
	if (b === null) {
		return a;
	}
	if (a === SemanticContext.NONE || b === SemanticContext.NONE) {
		return SemanticContext.NONE;
	}
	var result = new OR(a, b);
	if (result.opnds.length === 1) {
		return result.opnds[0];
	} else {
		return result;
	}
};

function Predicate(ruleIndex, predIndex, isCtxDependent) {
	SemanticContext.call(this);
	this.ruleIndex = ruleIndex === undefined ? -1 : ruleIndex;
	this.predIndex = predIndex === undefined ? -1 : predIndex;
	this.isCtxDependent = isCtxDependent === undefined ? false : isCtxDependent; // e.g., $i ref in pred
	return this;
}

Predicate.prototype = Object.create(SemanticContext.prototype);
Predicate.prototype.constructor = Predicate;

//The default {@link SemanticContext}, which is semantically equivalent to
//a predicate of the form {@code {true}?}.
//
SemanticContext.NONE = new Predicate();


Predicate.prototype.evaluate = function(parser, outerContext) {
	var localctx = this.isCtxDependent ? outerContext : null;
	return parser.sempred(localctx, this.ruleIndex, this.predIndex);
};

Predicate.prototype.updateHashCode = function(hash) {
	hash.update(this.ruleIndex, this.predIndex, this.isCtxDependent);
};

Predicate.prototype.equals = function(other) {
	if (this === other) {
		return true;
	} else if (!(other instanceof Predicate)) {
		return false;
	} else {
		return this.ruleIndex === other.ruleIndex &&
				this.predIndex === other.predIndex &&
				this.isCtxDependent === other.isCtxDependent;
	}
};

Predicate.prototype.toString = function() {
	return "{" + this.ruleIndex + ":" + this.predIndex + "}?";
};

function PrecedencePredicate(precedence) {
	SemanticContext.call(this);
	this.precedence = precedence === undefined ? 0 : precedence;
}

PrecedencePredicate.prototype = Object.create(SemanticContext.prototype);
PrecedencePredicate.prototype.constructor = PrecedencePredicate;

PrecedencePredicate.prototype.evaluate = function(parser, outerContext) {
	return parser.precpred(outerContext, this.precedence);
};

PrecedencePredicate.prototype.evalPrecedence = function(parser, outerContext) {
	if (parser.precpred(outerContext, this.precedence)) {
		return SemanticContext.NONE;
	} else {
		return null;
	}
};

PrecedencePredicate.prototype.compareTo = function(other) {
	return this.precedence - other.precedence;
};

PrecedencePredicate.prototype.updateHashCode = function(hash) {
    hash.update(31);
};

PrecedencePredicate.prototype.equals = function(other) {
	if (this === other) {
		return true;
	} else if (!(other instanceof PrecedencePredicate)) {
		return false;
	} else {
		return this.precedence === other.precedence;
	}
};

PrecedencePredicate.prototype.toString = function() {
	return "{"+this.precedence+">=prec}?";
};



PrecedencePredicate.filterPrecedencePredicates = function(set) {
	var result = [];
	set.values().map( function(context) {
		if (context instanceof PrecedencePredicate) {
			result.push(context);
		}
	});
	return result;
};


// A semantic context which is true whenever none of the contained contexts
// is false.
//
function AND(a, b) {
	SemanticContext.call(this);
	var operands = new Set();
	if (a instanceof AND) {
		a.opnds.map(function(o) {
			operands.add(o);
		});
	} else {
		operands.add(a);
	}
	if (b instanceof AND) {
		b.opnds.map(function(o) {
			operands.add(o);
		});
	} else {
		operands.add(b);
	}
	var precedencePredicates = PrecedencePredicate.filterPrecedencePredicates(operands);
	if (precedencePredicates.length > 0) {
		// interested in the transition with the lowest precedence
		var reduced = null;
		precedencePredicates.map( function(p) {
			if(reduced===null || p.precedence<reduced.precedence) {
				reduced = p;
			}
		});
		operands.add(reduced);
	}
	this.opnds = operands.values();
	return this;
}

AND.prototype = Object.create(SemanticContext.prototype);
AND.prototype.constructor = AND;

AND.prototype.equals = function(other) {
	if (this === other) {
		return true;
	} else if (!(other instanceof AND)) {
		return false;
	} else {
		return this.opnds === other.opnds;
	}
};

AND.prototype.updateHashCode = function(hash) {
    hash.update(this.opnds, "AND");
};
//
// {@inheritDoc}
//
// <p>
// The evaluation of predicates by this context is short-circuiting, but
// unordered.</p>
//
AND.prototype.evaluate = function(parser, outerContext) {
	for (var i = 0; i < this.opnds.length; i++) {
		if (!this.opnds[i].evaluate(parser, outerContext)) {
			return false;
		}
	}
	return true;
};

AND.prototype.evalPrecedence = function(parser, outerContext) {
	var differs = false;
	var operands = [];
	for (var i = 0; i < this.opnds.length; i++) {
		var context = this.opnds[i];
		var evaluated = context.evalPrecedence(parser, outerContext);
		differs |= (evaluated !== context);
		if (evaluated === null) {
			// The AND context is false if any element is false
			return null;
		} else if (evaluated !== SemanticContext.NONE) {
			// Reduce the result by skipping true elements
			operands.push(evaluated);
		}
	}
	if (!differs) {
		return this;
	}
	if (operands.length === 0) {
		// all elements were true, so the AND context is true
		return SemanticContext.NONE;
	}
	var result = null;
	operands.map(function(o) {
		result = result === null ? o : SemanticContext.andContext(result, o);
	});
	return result;
};

AND.prototype.toString = function() {
	var s = "";
	this.opnds.map(function(o) {
		s += "&& " + o.toString();
	});
	return s.length > 3 ? s.slice(3) : s;
};

//
// A semantic context which is true whenever at least one of the contained
// contexts is true.
//
function OR(a, b) {
	SemanticContext.call(this);
	var operands = new Set();
	if (a instanceof OR) {
		a.opnds.map(function(o) {
			operands.add(o);
		});
	} else {
		operands.add(a);
	}
	if (b instanceof OR) {
		b.opnds.map(function(o) {
			operands.add(o);
		});
	} else {
		operands.add(b);
	}

	var precedencePredicates = PrecedencePredicate.filterPrecedencePredicates(operands);
	if (precedencePredicates.length > 0) {
		// interested in the transition with the highest precedence
		var s = precedencePredicates.sort(function(a, b) {
			return a.compareTo(b);
		});
		var reduced = s[s.length-1];
		operands.add(reduced);
	}
	this.opnds = operands.values();
	return this;
}

OR.prototype = Object.create(SemanticContext.prototype);
OR.prototype.constructor = OR;

OR.prototype.constructor = function(other) {
	if (this === other) {
		return true;
	} else if (!(other instanceof OR)) {
		return false;
	} else {
		return this.opnds === other.opnds;
	}
};

OR.prototype.updateHashCode = function(hash) {
    hash.update(this.opnds, "OR");
};

// <p>
// The evaluation of predicates by this context is short-circuiting, but
// unordered.</p>
//
OR.prototype.evaluate = function(parser, outerContext) {
	for (var i = 0; i < this.opnds.length; i++) {
		if (this.opnds[i].evaluate(parser, outerContext)) {
			return true;
		}
	}
	return false;
};

OR.prototype.evalPrecedence = function(parser, outerContext) {
	var differs = false;
	var operands = [];
	for (var i = 0; i < this.opnds.length; i++) {
		var context = this.opnds[i];
		var evaluated = context.evalPrecedence(parser, outerContext);
		differs |= (evaluated !== context);
		if (evaluated === SemanticContext.NONE) {
			// The OR context is true if any element is true
			return SemanticContext.NONE;
		} else if (evaluated !== null) {
			// Reduce the result by skipping false elements
			operands.push(evaluated);
		}
	}
	if (!differs) {
		return this;
	}
	if (operands.length === 0) {
		// all elements were false, so the OR context is false
		return null;
	}
	var result = null;
	operands.map(function(o) {
		return result === null ? o : SemanticContext.orContext(result, o);
	});
	return result;
};

OR.prototype.toString = function() {
	var s = "";
	this.opnds.map(function(o) {
		s += "|| " + o.toString();
	});
	return s.length > 3 ? s.slice(3) : s;
};

exports.SemanticContext = SemanticContext;
exports.PrecedencePredicate = PrecedencePredicate;
exports.Predicate = Predicate;


/***/ }),

/***/ "./node_modules/antlr4/atn/Transition.js":
/*!***********************************************!*\
  !*** ./node_modules/antlr4/atn/Transition.js ***!
  \***********************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
//

//  An ATN transition between any two ATN states.  Subclasses define
//  atom, set, epsilon, action, predicate, rule transitions.
//
//  <p>This is a one way link.  It emanates from a state (usually via a list of
//  transitions) and has a target state.</p>
//
//  <p>Since we never have to change the ATN transitions once we construct it,
//  we can fix these transitions as specific classes. The DFA transitions
//  on the other hand need to update the labels as it adds transitions to
//  the states. We'll use the term Edge for the DFA to distinguish them from
//  ATN transitions.</p>

var Token = __webpack_require__(/*! ./../Token */ "./node_modules/antlr4/Token.js").Token;
var Interval = __webpack_require__(/*! ./../IntervalSet */ "./node_modules/antlr4/IntervalSet.js").Interval;
var IntervalSet = __webpack_require__(/*! ./../IntervalSet */ "./node_modules/antlr4/IntervalSet.js").IntervalSet;
var Predicate = __webpack_require__(/*! ./SemanticContext */ "./node_modules/antlr4/atn/SemanticContext.js").Predicate;
var PrecedencePredicate = __webpack_require__(/*! ./SemanticContext */ "./node_modules/antlr4/atn/SemanticContext.js").PrecedencePredicate;

function Transition (target) {
    // The target of this transition.
    if (target===undefined || target===null) {
        throw "target cannot be null.";
    }
    this.target = target;
    // Are we epsilon, action, sempred?
    this.isEpsilon = false;
    this.label = null;
    return this;
}
    // constants for serialization
Transition.EPSILON = 1;
Transition.RANGE = 2;
Transition.RULE = 3;
Transition.PREDICATE = 4; // e.g., {isType(input.LT(1))}?
Transition.ATOM = 5;
Transition.ACTION = 6;
Transition.SET = 7; // ~(A|B) or ~atom, wildcard, which convert to next 2
Transition.NOT_SET = 8;
Transition.WILDCARD = 9;
Transition.PRECEDENCE = 10;

Transition.serializationNames = [
            "INVALID",
            "EPSILON",
            "RANGE",
            "RULE",
            "PREDICATE",
            "ATOM",
            "ACTION",
            "SET",
            "NOT_SET",
            "WILDCARD",
            "PRECEDENCE"
        ];

Transition.serializationTypes = {
        EpsilonTransition: Transition.EPSILON,
        RangeTransition: Transition.RANGE,
        RuleTransition: Transition.RULE,
        PredicateTransition: Transition.PREDICATE,
        AtomTransition: Transition.ATOM,
        ActionTransition: Transition.ACTION,
        SetTransition: Transition.SET,
        NotSetTransition: Transition.NOT_SET,
        WildcardTransition: Transition.WILDCARD,
        PrecedencePredicateTransition: Transition.PRECEDENCE
    };


// TODO: make all transitions sets? no, should remove set edges
function AtomTransition(target, label) {
	Transition.call(this, target);
	this.label_ = label; // The token type or character value; or, signifies special label.
    this.label = this.makeLabel();
    this.serializationType = Transition.ATOM;
    return this;
}

AtomTransition.prototype = Object.create(Transition.prototype);
AtomTransition.prototype.constructor = AtomTransition;

AtomTransition.prototype.makeLabel = function() {
	var s = new IntervalSet();
    s.addOne(this.label_);
    return s;
};

AtomTransition.prototype.matches = function( symbol, minVocabSymbol,  maxVocabSymbol) {
    return this.label_ === symbol;
};

AtomTransition.prototype.toString = function() {
	return this.label_;
};

function RuleTransition(ruleStart, ruleIndex, precedence, followState) {
	Transition.call(this, ruleStart);
    this.ruleIndex = ruleIndex; // ptr to the rule definition object for this rule ref
    this.precedence = precedence;
    this.followState = followState; // what node to begin computations following ref to rule
    this.serializationType = Transition.RULE;
    this.isEpsilon = true;
    return this;
}

RuleTransition.prototype = Object.create(Transition.prototype);
RuleTransition.prototype.constructor = RuleTransition;

RuleTransition.prototype.matches = function(symbol, minVocabSymbol,  maxVocabSymbol) {
	return false;
};


function EpsilonTransition(target, outermostPrecedenceReturn) {
	Transition.call(this, target);
    this.serializationType = Transition.EPSILON;
    this.isEpsilon = true;
    this.outermostPrecedenceReturn = outermostPrecedenceReturn;
    return this;
}

EpsilonTransition.prototype = Object.create(Transition.prototype);
EpsilonTransition.prototype.constructor = EpsilonTransition;

EpsilonTransition.prototype.matches = function( symbol, minVocabSymbol,  maxVocabSymbol) {
	return false;
};

EpsilonTransition.prototype.toString = function() {
	return "epsilon";
};

function RangeTransition(target, start, stop) {
	Transition.call(this, target);
	this.serializationType = Transition.RANGE;
    this.start = start;
    this.stop = stop;
    this.label = this.makeLabel();
    return this;
}

RangeTransition.prototype = Object.create(Transition.prototype);
RangeTransition.prototype.constructor = RangeTransition;

RangeTransition.prototype.makeLabel = function() {
    var s = new IntervalSet();
    s.addRange(this.start, this.stop);
    return s;
};

RangeTransition.prototype.matches = function(symbol, minVocabSymbol,  maxVocabSymbol) {
	return symbol >= this.start && symbol <= this.stop;
};

RangeTransition.prototype.toString = function() {
	return "'" + String.fromCharCode(this.start) + "'..'" + String.fromCharCode(this.stop) + "'";
};

function AbstractPredicateTransition(target) {
	Transition.call(this, target);
	return this;
}

AbstractPredicateTransition.prototype = Object.create(Transition.prototype);
AbstractPredicateTransition.prototype.constructor = AbstractPredicateTransition;

function PredicateTransition(target, ruleIndex, predIndex, isCtxDependent) {
	AbstractPredicateTransition.call(this, target);
    this.serializationType = Transition.PREDICATE;
    this.ruleIndex = ruleIndex;
    this.predIndex = predIndex;
    this.isCtxDependent = isCtxDependent; // e.g., $i ref in pred
    this.isEpsilon = true;
    return this;
}

PredicateTransition.prototype = Object.create(AbstractPredicateTransition.prototype);
PredicateTransition.prototype.constructor = PredicateTransition;

PredicateTransition.prototype.matches = function(symbol, minVocabSymbol,  maxVocabSymbol) {
	return false;
};

PredicateTransition.prototype.getPredicate = function() {
	return new Predicate(this.ruleIndex, this.predIndex, this.isCtxDependent);
};

PredicateTransition.prototype.toString = function() {
	return "pred_" + this.ruleIndex + ":" + this.predIndex;
};

function ActionTransition(target, ruleIndex, actionIndex, isCtxDependent) {
	Transition.call(this, target);
    this.serializationType = Transition.ACTION;
    this.ruleIndex = ruleIndex;
    this.actionIndex = actionIndex===undefined ? -1 : actionIndex;
    this.isCtxDependent = isCtxDependent===undefined ? false : isCtxDependent; // e.g., $i ref in pred
    this.isEpsilon = true;
    return this;
}

ActionTransition.prototype = Object.create(Transition.prototype);
ActionTransition.prototype.constructor = ActionTransition;


ActionTransition.prototype.matches = function(symbol, minVocabSymbol,  maxVocabSymbol) {
	return false;
};

ActionTransition.prototype.toString = function() {
	return "action_" + this.ruleIndex + ":" + this.actionIndex;
};


// A transition containing a set of values.
function SetTransition(target, set) {
	Transition.call(this, target);
	this.serializationType = Transition.SET;
    if (set !==undefined && set !==null) {
        this.label = set;
    } else {
        this.label = new IntervalSet();
        this.label.addOne(Token.INVALID_TYPE);
    }
    return this;
}

SetTransition.prototype = Object.create(Transition.prototype);
SetTransition.prototype.constructor = SetTransition;

SetTransition.prototype.matches = function(symbol, minVocabSymbol,  maxVocabSymbol) {
	return this.label.contains(symbol);
};


SetTransition.prototype.toString = function() {
	return this.label.toString();
};

function NotSetTransition(target, set) {
	SetTransition.call(this, target, set);
	this.serializationType = Transition.NOT_SET;
	return this;
}

NotSetTransition.prototype = Object.create(SetTransition.prototype);
NotSetTransition.prototype.constructor = NotSetTransition;

NotSetTransition.prototype.matches = function(symbol, minVocabSymbol,  maxVocabSymbol) {
	return symbol >= minVocabSymbol && symbol <= maxVocabSymbol &&
			!SetTransition.prototype.matches.call(this, symbol, minVocabSymbol, maxVocabSymbol);
};

NotSetTransition.prototype.toString = function() {
	return '~' + SetTransition.prototype.toString.call(this);
};

function WildcardTransition(target) {
	Transition.call(this, target);
	this.serializationType = Transition.WILDCARD;
	return this;
}

WildcardTransition.prototype = Object.create(Transition.prototype);
WildcardTransition.prototype.constructor = WildcardTransition;


WildcardTransition.prototype.matches = function(symbol, minVocabSymbol,  maxVocabSymbol) {
	return symbol >= minVocabSymbol && symbol <= maxVocabSymbol;
};

WildcardTransition.prototype.toString = function() {
	return ".";
};

function PrecedencePredicateTransition(target, precedence) {
	AbstractPredicateTransition.call(this, target);
    this.serializationType = Transition.PRECEDENCE;
    this.precedence = precedence;
    this.isEpsilon = true;
    return this;
}

PrecedencePredicateTransition.prototype = Object.create(AbstractPredicateTransition.prototype);
PrecedencePredicateTransition.prototype.constructor = PrecedencePredicateTransition;

PrecedencePredicateTransition.prototype.matches = function(symbol, minVocabSymbol,  maxVocabSymbol) {
	return false;
};

PrecedencePredicateTransition.prototype.getPredicate = function() {
	return new PrecedencePredicate(this.precedence);
};

PrecedencePredicateTransition.prototype.toString = function() {
	return this.precedence + " >= _p";
};

exports.Transition = Transition;
exports.AtomTransition = AtomTransition;
exports.SetTransition = SetTransition;
exports.NotSetTransition = NotSetTransition;
exports.RuleTransition = RuleTransition;
exports.ActionTransition = ActionTransition;
exports.EpsilonTransition = EpsilonTransition;
exports.RangeTransition = RangeTransition;
exports.WildcardTransition = WildcardTransition;
exports.PredicateTransition = PredicateTransition;
exports.PrecedencePredicateTransition = PrecedencePredicateTransition;
exports.AbstractPredicateTransition = AbstractPredicateTransition;

/***/ }),

/***/ "./node_modules/antlr4/atn/index.js":
/*!******************************************!*\
  !*** ./node_modules/antlr4/atn/index.js ***!
  \******************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

exports.ATN = __webpack_require__(/*! ./ATN */ "./node_modules/antlr4/atn/ATN.js").ATN;
exports.ATNDeserializer = __webpack_require__(/*! ./ATNDeserializer */ "./node_modules/antlr4/atn/ATNDeserializer.js").ATNDeserializer;
exports.LexerATNSimulator = __webpack_require__(/*! ./LexerATNSimulator */ "./node_modules/antlr4/atn/LexerATNSimulator.js").LexerATNSimulator;
exports.ParserATNSimulator = __webpack_require__(/*! ./ParserATNSimulator */ "./node_modules/antlr4/atn/ParserATNSimulator.js").ParserATNSimulator;
exports.PredictionMode = __webpack_require__(/*! ./PredictionMode */ "./node_modules/antlr4/atn/PredictionMode.js").PredictionMode;


/***/ }),

/***/ "./node_modules/antlr4/dfa/DFA.js":
/*!****************************************!*\
  !*** ./node_modules/antlr4/dfa/DFA.js ***!
  \****************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

var Set = __webpack_require__(/*! ../Utils */ "./node_modules/antlr4/Utils.js").Set;
var DFAState = __webpack_require__(/*! ./DFAState */ "./node_modules/antlr4/dfa/DFAState.js").DFAState;
var StarLoopEntryState = __webpack_require__(/*! ../atn/ATNState */ "./node_modules/antlr4/atn/ATNState.js").StarLoopEntryState;
var ATNConfigSet = __webpack_require__(/*! ./../atn/ATNConfigSet */ "./node_modules/antlr4/atn/ATNConfigSet.js").ATNConfigSet;
var DFASerializer = __webpack_require__(/*! ./DFASerializer */ "./node_modules/antlr4/dfa/DFASerializer.js").DFASerializer;
var LexerDFASerializer = __webpack_require__(/*! ./DFASerializer */ "./node_modules/antlr4/dfa/DFASerializer.js").LexerDFASerializer;



function DFA(atnStartState, decision) {
	if (decision === undefined) {
		decision = 0;
	}
	// From which ATN state did we create this DFA?
	this.atnStartState = atnStartState;
	this.decision = decision;
	// A set of all DFA states. Use {@link Map} so we can get old state back
	// ({@link Set} only allows you to see if it's there).
	this._states = new Set();
	this.s0 = null;
	// {@code true} if this DFA is for a precedence decision; otherwise,
	// {@code false}. This is the backing field for {@link //isPrecedenceDfa},
	// {@link //setPrecedenceDfa}.
	this.precedenceDfa = false;
    if (atnStartState instanceof StarLoopEntryState)
    {
        if (atnStartState.isPrecedenceDecision) {
            this.precedenceDfa = true;
            var precedenceState = new DFAState(null, new ATNConfigSet());
            precedenceState.edges = [];
            precedenceState.isAcceptState = false;
            precedenceState.requiresFullContext = false;
            this.s0 = precedenceState;
        }
    }
	return this;
}

// Get the start state for a specific precedence value.
//
// @param precedence The current precedence.
// @return The start state corresponding to the specified precedence, or
// {@code null} if no start state exists for the specified precedence.
//
// @throws IllegalStateException if this is not a precedence DFA.
// @see //isPrecedenceDfa()

DFA.prototype.getPrecedenceStartState = function(precedence) {
	if (!(this.precedenceDfa)) {
		throw ("Only precedence DFAs may contain a precedence start state.");
	}
	// s0.edges is never null for a precedence DFA
	if (precedence < 0 || precedence >= this.s0.edges.length) {
		return null;
	}
	return this.s0.edges[precedence] || null;
};

// Set the start state for a specific precedence value.
//
// @param precedence The current precedence.
// @param startState The start state corresponding to the specified
// precedence.
//
// @throws IllegalStateException if this is not a precedence DFA.
// @see //isPrecedenceDfa()
//
DFA.prototype.setPrecedenceStartState = function(precedence, startState) {
	if (!(this.precedenceDfa)) {
		throw ("Only precedence DFAs may contain a precedence start state.");
	}
	if (precedence < 0) {
		return;
	}

	// synchronization on s0 here is ok. when the DFA is turned into a
	// precedence DFA, s0 will be initialized once and not updated again
	// s0.edges is never null for a precedence DFA
	this.s0.edges[precedence] = startState;
};

//
// Sets whether this is a precedence DFA. If the specified value differs
// from the current DFA configuration, the following actions are taken;
// otherwise no changes are made to the current DFA.
//
// <ul>
// <li>The {@link //states} map is cleared</li>
// <li>If {@code precedenceDfa} is {@code false}, the initial state
// {@link //s0} is set to {@code null}; otherwise, it is initialized to a new
// {@link DFAState} with an empty outgoing {@link DFAState//edges} array to
// store the start states for individual precedence values.</li>
// <li>The {@link //precedenceDfa} field is updated</li>
// </ul>
//
// @param precedenceDfa {@code true} if this is a precedence DFA; otherwise,
// {@code false}

DFA.prototype.setPrecedenceDfa = function(precedenceDfa) {
	if (this.precedenceDfa!==precedenceDfa) {
		this._states = new DFAStatesSet();
		if (precedenceDfa) {
			var precedenceState = new DFAState(null, new ATNConfigSet());
			precedenceState.edges = [];
			precedenceState.isAcceptState = false;
			precedenceState.requiresFullContext = false;
			this.s0 = precedenceState;
		} else {
			this.s0 = null;
		}
		this.precedenceDfa = precedenceDfa;
	}
};

Object.defineProperty(DFA.prototype, "states", {
	get : function() {
		return this._states;
	}
});

// Return a list of all states in this DFA, ordered by state number.
DFA.prototype.sortedStates = function() {
	var list = this._states.values();
	return list.sort(function(a, b) {
		return a.stateNumber - b.stateNumber;
	});
};

DFA.prototype.toString = function(literalNames, symbolicNames) {
	literalNames = literalNames || null;
	symbolicNames = symbolicNames || null;
	if (this.s0 === null) {
		return "";
	}
	var serializer = new DFASerializer(this, literalNames, symbolicNames);
	return serializer.toString();
};

DFA.prototype.toLexerString = function() {
	if (this.s0 === null) {
		return "";
	}
	var serializer = new LexerDFASerializer(this);
	return serializer.toString();
};

exports.DFA = DFA;


/***/ }),

/***/ "./node_modules/antlr4/dfa/DFASerializer.js":
/*!**************************************************!*\
  !*** ./node_modules/antlr4/dfa/DFASerializer.js ***!
  \**************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

// A DFA walker that knows how to dump them to serialized strings.#/


function DFASerializer(dfa, literalNames, symbolicNames) {
	this.dfa = dfa;
	this.literalNames = literalNames || [];
	this.symbolicNames = symbolicNames || [];
	return this;
}

DFASerializer.prototype.toString = function() {
   if(this.dfa.s0 === null) {
       return null;
   }
   var buf = "";
   var states = this.dfa.sortedStates();
   for(var i=0;i<states.length;i++) {
       var s = states[i];
       if(s.edges!==null) {
            var n = s.edges.length;
            for(var j=0;j<n;j++) {
                var t = s.edges[j] || null;
                if(t!==null && t.stateNumber !== 0x7FFFFFFF) {
                    buf = buf.concat(this.getStateString(s));
                    buf = buf.concat("-");
                    buf = buf.concat(this.getEdgeLabel(j));
                    buf = buf.concat("->");
                    buf = buf.concat(this.getStateString(t));
                    buf = buf.concat('\n');
                }
            }
       }
   }
   return buf.length===0 ? null : buf;
};

DFASerializer.prototype.getEdgeLabel = function(i) {
    if (i===0) {
        return "EOF";
    } else if(this.literalNames !==null || this.symbolicNames!==null) {
        return this.literalNames[i-1] || this.symbolicNames[i-1];
    } else {
        return String.fromCharCode(i-1);
    }
};

DFASerializer.prototype.getStateString = function(s) {
    var baseStateStr = ( s.isAcceptState ? ":" : "") + "s" + s.stateNumber + ( s.requiresFullContext ? "^" : "");
    if(s.isAcceptState) {
        if (s.predicates !== null) {
            return baseStateStr + "=>" + s.predicates.toString();
        } else {
            return baseStateStr + "=>" + s.prediction.toString();
        }
    } else {
        return baseStateStr;
    }
};

function LexerDFASerializer(dfa) {
	DFASerializer.call(this, dfa, null);
	return this;
}

LexerDFASerializer.prototype = Object.create(DFASerializer.prototype);
LexerDFASerializer.prototype.constructor = LexerDFASerializer;

LexerDFASerializer.prototype.getEdgeLabel = function(i) {
	return "'" + String.fromCharCode(i) + "'";
};

exports.DFASerializer = DFASerializer;
exports.LexerDFASerializer = LexerDFASerializer;



/***/ }),

/***/ "./node_modules/antlr4/dfa/DFAState.js":
/*!*********************************************!*\
  !*** ./node_modules/antlr4/dfa/DFAState.js ***!
  \*********************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
///

var ATNConfigSet = __webpack_require__(/*! ./../atn/ATNConfigSet */ "./node_modules/antlr4/atn/ATNConfigSet.js").ATNConfigSet;
var Utils = __webpack_require__(/*! ./../Utils */ "./node_modules/antlr4/Utils.js");
var Hash = Utils.Hash;
var Set = Utils.Set;

// Map a predicate to a predicted alternative.///

function PredPrediction(pred, alt) {
	this.alt = alt;
	this.pred = pred;
	return this;
}

PredPrediction.prototype.toString = function() {
	return "(" + this.pred + ", " + this.alt + ")";
};

// A DFA state represents a set of possible ATN configurations.
// As Aho, Sethi, Ullman p. 117 says "The DFA uses its state
// to keep track of all possible states the ATN can be in after
// reading each input symbol. That is to say, after reading
// input a1a2..an, the DFA is in a state that represents the
// subset T of the states of the ATN that are reachable from the
// ATN's start state along some path labeled a1a2..an."
// In conventional NFA&rarr;DFA conversion, therefore, the subset T
// would be a bitset representing the set of states the
// ATN could be in. We need to track the alt predicted by each
// state as well, however. More importantly, we need to maintain
// a stack of states, tracking the closure operations as they
// jump from rule to rule, emulating rule invocations (method calls).
// I have to add a stack to simulate the proper lookahead sequences for
// the underlying LL grammar from which the ATN was derived.
//
// <p>I use a set of ATNConfig objects not simple states. An ATNConfig
// is both a state (ala normal conversion) and a RuleContext describing
// the chain of rules (if any) followed to arrive at that state.</p>
//
// <p>A DFA state may have multiple references to a particular state,
// but with different ATN contexts (with same or different alts)
// meaning that state was reached via a different set of rule invocations.</p>
// /

function DFAState(stateNumber, configs) {
	if (stateNumber === null) {
		stateNumber = -1;
	}
	if (configs === null) {
		configs = new ATNConfigSet();
	}
	this.stateNumber = stateNumber;
	this.configs = configs;
	// {@code edges[symbol]} points to target of symbol. Shift up by 1 so (-1)
	// {@link Token//EOF} maps to {@code edges[0]}.
	this.edges = null;
	this.isAcceptState = false;
	// if accept state, what ttype do we match or alt do we predict?
	// This is set to {@link ATN//INVALID_ALT_NUMBER} when {@link
	// //predicates}{@code !=null} or
	// {@link //requiresFullContext}.
	this.prediction = 0;
	this.lexerActionExecutor = null;
	// Indicates that this state was created during SLL prediction that
	// discovered a conflict between the configurations in the state. Future
	// {@link ParserATNSimulator//execATN} invocations immediately jumped doing
	// full context prediction if this field is true.
	this.requiresFullContext = false;
	// During SLL parsing, this is a list of predicates associated with the
	// ATN configurations of the DFA state. When we have predicates,
	// {@link //requiresFullContext} is {@code false} since full context
	// prediction evaluates predicates
	// on-the-fly. If this is not null, then {@link //prediction} is
	// {@link ATN//INVALID_ALT_NUMBER}.
	//
	// <p>We only use these for non-{@link //requiresFullContext} but
	// conflicting states. That
	// means we know from the context (it's $ or we don't dip into outer
	// context) that it's an ambiguity not a conflict.</p>
	//
	// <p>This list is computed by {@link
	// ParserATNSimulator//predicateDFAState}.</p>
	this.predicates = null;
	return this;
}

// Get the set of all alts mentioned by all ATN configurations in this
// DFA state.
DFAState.prototype.getAltSet = function() {
	var alts = new Set();
	if (this.configs !== null) {
		for (var i = 0; i < this.configs.length; i++) {
			var c = this.configs[i];
			alts.add(c.alt);
		}
	}
	if (alts.length === 0) {
		return null;
	} else {
		return alts;
	}
};

// Two {@link DFAState} instances are equal if their ATN configuration sets
// are the same. This method is used to see if a state already exists.
//
// <p>Because the number of alternatives and number of ATN configurations are
// finite, there is a finite number of DFA states that can be processed.
// This is necessary to show that the algorithm terminates.</p>
//
// <p>Cannot test the DFA state numbers here because in
// {@link ParserATNSimulator//addDFAState} we need to know if any other state
// exists that has this exact set of ATN configurations. The
// {@link //stateNumber} is irrelevant.</p>
DFAState.prototype.equals = function(other) {
	// compare set of ATN configurations in this set with other
	return this === other ||
			(other instanceof DFAState &&
				this.configs.equals(other.configs));
};

DFAState.prototype.toString = function() {
	var s = "" + this.stateNumber + ":" + this.configs;
	if(this.isAcceptState) {
        s = s + "=>";
        if (this.predicates !== null)
            s = s + this.predicates;
        else
            s = s + this.prediction;
    }
	return s;
};

DFAState.prototype.hashCode = function() {
	var hash = new Hash();
	hash.update(this.configs);
    return hash.finish();
};

exports.DFAState = DFAState;
exports.PredPrediction = PredPrediction;


/***/ }),

/***/ "./node_modules/antlr4/dfa/index.js":
/*!******************************************!*\
  !*** ./node_modules/antlr4/dfa/index.js ***!
  \******************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

exports.DFA = __webpack_require__(/*! ./DFA */ "./node_modules/antlr4/dfa/DFA.js").DFA;
exports.DFASerializer = __webpack_require__(/*! ./DFASerializer */ "./node_modules/antlr4/dfa/DFASerializer.js").DFASerializer;
exports.LexerDFASerializer = __webpack_require__(/*! ./DFASerializer */ "./node_modules/antlr4/dfa/DFASerializer.js").LexerDFASerializer;
exports.PredPrediction = __webpack_require__(/*! ./DFAState */ "./node_modules/antlr4/dfa/DFAState.js").PredPrediction;


/***/ }),

/***/ "./node_modules/antlr4/error/DiagnosticErrorListener.js":
/*!**************************************************************!*\
  !*** ./node_modules/antlr4/error/DiagnosticErrorListener.js ***!
  \**************************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
//

//
// This implementation of {@link ANTLRErrorListener} can be used to identify
// certain potential correctness and performance problems in grammars. "Reports"
// are made by calling {@link Parser//notifyErrorListeners} with the appropriate
// message.
//
// <ul>
// <li><b>Ambiguities</b>: These are cases where more than one path through the
// grammar can match the input.</li>
// <li><b>Weak context sensitivity</b>: These are cases where full-context
// prediction resolved an SLL conflict to a unique alternative which equaled the
// minimum alternative of the SLL conflict.</li>
// <li><b>Strong (forced) context sensitivity</b>: These are cases where the
// full-context prediction resolved an SLL conflict to a unique alternative,
// <em>and</em> the minimum alternative of the SLL conflict was found to not be
// a truly viable alternative. Two-stage parsing cannot be used for inputs where
// this situation occurs.</li>
// </ul>

var BitSet = __webpack_require__(/*! ./../Utils */ "./node_modules/antlr4/Utils.js").BitSet;
var ErrorListener = __webpack_require__(/*! ./ErrorListener */ "./node_modules/antlr4/error/ErrorListener.js").ErrorListener;
var Interval = __webpack_require__(/*! ./../IntervalSet */ "./node_modules/antlr4/IntervalSet.js").Interval;

function DiagnosticErrorListener(exactOnly) {
	ErrorListener.call(this);
	exactOnly = exactOnly || true;
	// whether all ambiguities or only exact ambiguities are reported.
	this.exactOnly = exactOnly;
	return this;
}

DiagnosticErrorListener.prototype = Object.create(ErrorListener.prototype);
DiagnosticErrorListener.prototype.constructor = DiagnosticErrorListener;

DiagnosticErrorListener.prototype.reportAmbiguity = function(recognizer, dfa,
		startIndex, stopIndex, exact, ambigAlts, configs) {
	if (this.exactOnly && !exact) {
		return;
	}
	var msg = "reportAmbiguity d=" +
			this.getDecisionDescription(recognizer, dfa) +
			": ambigAlts=" +
			this.getConflictingAlts(ambigAlts, configs) +
			", input='" +
			recognizer.getTokenStream().getText(new Interval(startIndex, stopIndex)) + "'";
	recognizer.notifyErrorListeners(msg);
};

DiagnosticErrorListener.prototype.reportAttemptingFullContext = function(
		recognizer, dfa, startIndex, stopIndex, conflictingAlts, configs) {
	var msg = "reportAttemptingFullContext d=" +
			this.getDecisionDescription(recognizer, dfa) +
			", input='" +
			recognizer.getTokenStream().getText(new Interval(startIndex, stopIndex)) + "'";
	recognizer.notifyErrorListeners(msg);
};

DiagnosticErrorListener.prototype.reportContextSensitivity = function(
		recognizer, dfa, startIndex, stopIndex, prediction, configs) {
	var msg = "reportContextSensitivity d=" +
			this.getDecisionDescription(recognizer, dfa) +
			", input='" +
			recognizer.getTokenStream().getText(new Interval(startIndex, stopIndex)) + "'";
	recognizer.notifyErrorListeners(msg);
};

DiagnosticErrorListener.prototype.getDecisionDescription = function(recognizer, dfa) {
	var decision = dfa.decision;
	var ruleIndex = dfa.atnStartState.ruleIndex;

	var ruleNames = recognizer.ruleNames;
	if (ruleIndex < 0 || ruleIndex >= ruleNames.length) {
		return "" + decision;
	}
	var ruleName = ruleNames[ruleIndex] || null;
	if (ruleName === null || ruleName.length === 0) {
		return "" + decision;
	}
	return "" + decision + " (" + ruleName + ")";
};

//
// Computes the set of conflicting or ambiguous alternatives from a
// configuration set, if that information was not already provided by the
// parser.
//
// @param reportedAlts The set of conflicting or ambiguous alternatives, as
// reported by the parser.
// @param configs The conflicting or ambiguous configuration set.
// @return Returns {@code reportedAlts} if it is not {@code null}, otherwise
// returns the set of alternatives represented in {@code configs}.
//
DiagnosticErrorListener.prototype.getConflictingAlts = function(reportedAlts, configs) {
	if (reportedAlts !== null) {
		return reportedAlts;
	}
	var result = new BitSet();
	for (var i = 0; i < configs.items.length; i++) {
		result.add(configs.items[i].alt);
	}
	return "{" + result.values().join(", ") + "}";
};

exports.DiagnosticErrorListener = DiagnosticErrorListener;

/***/ }),

/***/ "./node_modules/antlr4/error/ErrorListener.js":
/*!****************************************************!*\
  !*** ./node_modules/antlr4/error/ErrorListener.js ***!
  \****************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

// Provides an empty default implementation of {@link ANTLRErrorListener}. The
// default implementation of each method does nothing, but can be overridden as
// necessary.

function ErrorListener() {
	return this;
}

ErrorListener.prototype.syntaxError = function(recognizer, offendingSymbol, line, column, msg, e) {
};

ErrorListener.prototype.reportAmbiguity = function(recognizer, dfa, startIndex, stopIndex, exact, ambigAlts, configs) {
};

ErrorListener.prototype.reportAttemptingFullContext = function(recognizer, dfa, startIndex, stopIndex, conflictingAlts, configs) {
};

ErrorListener.prototype.reportContextSensitivity = function(recognizer, dfa, startIndex, stopIndex, prediction, configs) {
};

function ConsoleErrorListener() {
	ErrorListener.call(this);
	return this;
}

ConsoleErrorListener.prototype = Object.create(ErrorListener.prototype);
ConsoleErrorListener.prototype.constructor = ConsoleErrorListener;

//
// Provides a default instance of {@link ConsoleErrorListener}.
//
ConsoleErrorListener.INSTANCE = new ConsoleErrorListener();

//
// {@inheritDoc}
//
// <p>
// This implementation prints messages to {@link System//err} containing the
// values of {@code line}, {@code charPositionInLine}, and {@code msg} using
// the following format.</p>
//
// <pre>
// line <em>line</em>:<em>charPositionInLine</em> <em>msg</em>
// </pre>
//
ConsoleErrorListener.prototype.syntaxError = function(recognizer, offendingSymbol, line, column, msg, e) {
    console.error("line " + line + ":" + column + " " + msg);
};

function ProxyErrorListener(delegates) {
	ErrorListener.call(this);
    if (delegates===null) {
        throw "delegates";
    }
    this.delegates = delegates;
	return this;
}

ProxyErrorListener.prototype = Object.create(ErrorListener.prototype);
ProxyErrorListener.prototype.constructor = ProxyErrorListener;

ProxyErrorListener.prototype.syntaxError = function(recognizer, offendingSymbol, line, column, msg, e) {
    this.delegates.map(function(d) { d.syntaxError(recognizer, offendingSymbol, line, column, msg, e); });
};

ProxyErrorListener.prototype.reportAmbiguity = function(recognizer, dfa, startIndex, stopIndex, exact, ambigAlts, configs) {
    this.delegates.map(function(d) { d.reportAmbiguity(recognizer, dfa, startIndex, stopIndex, exact, ambigAlts, configs); });
};

ProxyErrorListener.prototype.reportAttemptingFullContext = function(recognizer, dfa, startIndex, stopIndex, conflictingAlts, configs) {
	this.delegates.map(function(d) { d.reportAttemptingFullContext(recognizer, dfa, startIndex, stopIndex, conflictingAlts, configs); });
};

ProxyErrorListener.prototype.reportContextSensitivity = function(recognizer, dfa, startIndex, stopIndex, prediction, configs) {
	this.delegates.map(function(d) { d.reportContextSensitivity(recognizer, dfa, startIndex, stopIndex, prediction, configs); });
};

exports.ErrorListener = ErrorListener;
exports.ConsoleErrorListener = ConsoleErrorListener;
exports.ProxyErrorListener = ProxyErrorListener;



/***/ }),

/***/ "./node_modules/antlr4/error/ErrorStrategy.js":
/*!****************************************************!*\
  !*** ./node_modules/antlr4/error/ErrorStrategy.js ***!
  \****************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

//
/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
//

var Token = __webpack_require__(/*! ./../Token */ "./node_modules/antlr4/Token.js").Token;
var Errors = __webpack_require__(/*! ./Errors */ "./node_modules/antlr4/error/Errors.js");
var NoViableAltException = Errors.NoViableAltException;
var InputMismatchException = Errors.InputMismatchException;
var FailedPredicateException = Errors.FailedPredicateException;
var ParseCancellationException = Errors.ParseCancellationException;
var ATNState = __webpack_require__(/*! ./../atn/ATNState */ "./node_modules/antlr4/atn/ATNState.js").ATNState;
var Interval = __webpack_require__(/*! ./../IntervalSet */ "./node_modules/antlr4/IntervalSet.js").Interval;
var IntervalSet = __webpack_require__(/*! ./../IntervalSet */ "./node_modules/antlr4/IntervalSet.js").IntervalSet;

function ErrorStrategy() {

}

ErrorStrategy.prototype.reset = function(recognizer){
};

ErrorStrategy.prototype.recoverInline = function(recognizer){
};

ErrorStrategy.prototype.recover = function(recognizer, e){
};

ErrorStrategy.prototype.sync = function(recognizer){
};

ErrorStrategy.prototype.inErrorRecoveryMode = function(recognizer){
};

ErrorStrategy.prototype.reportError = function(recognizer){
};



// This is the default implementation of {@link ANTLRErrorStrategy} used for
// error reporting and recovery in ANTLR parsers.
//
function DefaultErrorStrategy() {
	ErrorStrategy.call(this);
    // Indicates whether the error strategy is currently "recovering from an
    // error". This is used to suppress reporting multiple error messages while
    // attempting to recover from a detected syntax error.
    //
    // @see //inErrorRecoveryMode
    //
    this.errorRecoveryMode = false;

    // The index into the input stream where the last error occurred.
    // This is used to prevent infinite loops where an error is found
    // but no token is consumed during recovery...another error is found,
    // ad nauseum. This is a failsafe mechanism to guarantee that at least
    // one token/tree node is consumed for two errors.
    //
    this.lastErrorIndex = -1;
    this.lastErrorStates = null;
    return this;
}

DefaultErrorStrategy.prototype = Object.create(ErrorStrategy.prototype);
DefaultErrorStrategy.prototype.constructor = DefaultErrorStrategy;

// <p>The default implementation simply calls {@link //endErrorCondition} to
// ensure that the handler is not in error recovery mode.</p>
DefaultErrorStrategy.prototype.reset = function(recognizer) {
    this.endErrorCondition(recognizer);
};

//
// This method is called to enter error recovery mode when a recognition
// exception is reported.
//
// @param recognizer the parser instance
//
DefaultErrorStrategy.prototype.beginErrorCondition = function(recognizer) {
    this.errorRecoveryMode = true;
};

DefaultErrorStrategy.prototype.inErrorRecoveryMode = function(recognizer) {
    return this.errorRecoveryMode;
};

//
// This method is called to leave error recovery mode after recovering from
// a recognition exception.
//
// @param recognizer
//
DefaultErrorStrategy.prototype.endErrorCondition = function(recognizer) {
    this.errorRecoveryMode = false;
    this.lastErrorStates = null;
    this.lastErrorIndex = -1;
};

//
// {@inheritDoc}
//
// <p>The default implementation simply calls {@link //endErrorCondition}.</p>
//
DefaultErrorStrategy.prototype.reportMatch = function(recognizer) {
    this.endErrorCondition(recognizer);
};

//
// {@inheritDoc}
//
// <p>The default implementation returns immediately if the handler is already
// in error recovery mode. Otherwise, it calls {@link //beginErrorCondition}
// and dispatches the reporting task based on the runtime type of {@code e}
// according to the following table.</p>
//
// <ul>
// <li>{@link NoViableAltException}: Dispatches the call to
// {@link //reportNoViableAlternative}</li>
// <li>{@link InputMismatchException}: Dispatches the call to
// {@link //reportInputMismatch}</li>
// <li>{@link FailedPredicateException}: Dispatches the call to
// {@link //reportFailedPredicate}</li>
// <li>All other types: calls {@link Parser//notifyErrorListeners} to report
// the exception</li>
// </ul>
//
DefaultErrorStrategy.prototype.reportError = function(recognizer, e) {
   // if we've already reported an error and have not matched a token
   // yet successfully, don't report any errors.
    if(this.inErrorRecoveryMode(recognizer)) {
        return; // don't report spurious errors
    }
    this.beginErrorCondition(recognizer);
    if ( e instanceof NoViableAltException ) {
        this.reportNoViableAlternative(recognizer, e);
    } else if ( e instanceof InputMismatchException ) {
        this.reportInputMismatch(recognizer, e);
    } else if ( e instanceof FailedPredicateException ) {
        this.reportFailedPredicate(recognizer, e);
    } else {
        console.log("unknown recognition error type: " + e.constructor.name);
        console.log(e.stack);
        recognizer.notifyErrorListeners(e.getOffendingToken(), e.getMessage(), e);
    }
};
//
// {@inheritDoc}
//
// <p>The default implementation resynchronizes the parser by consuming tokens
// until we find one in the resynchronization set--loosely the set of tokens
// that can follow the current rule.</p>
//
DefaultErrorStrategy.prototype.recover = function(recognizer, e) {
    if (this.lastErrorIndex===recognizer.getInputStream().index &&
        this.lastErrorStates !== null && this.lastErrorStates.indexOf(recognizer.state)>=0) {
		// uh oh, another error at same token index and previously-visited
		// state in ATN; must be a case where LT(1) is in the recovery
		// token set so nothing got consumed. Consume a single token
		// at least to prevent an infinite loop; this is a failsafe.
		recognizer.consume();
    }
    this.lastErrorIndex = recognizer._input.index;
    if (this.lastErrorStates === null) {
        this.lastErrorStates = [];
    }
    this.lastErrorStates.push(recognizer.state);
    var followSet = this.getErrorRecoverySet(recognizer);
    this.consumeUntil(recognizer, followSet);
};

// The default implementation of {@link ANTLRErrorStrategy//sync} makes sure
// that the current lookahead symbol is consistent with what were expecting
// at this point in the ATN. You can call this anytime but ANTLR only
// generates code to check before subrules/loops and each iteration.
//
// <p>Implements Jim Idle's magic sync mechanism in closures and optional
// subrules. E.g.,</p>
//
// <pre>
// a : sync ( stuff sync )* ;
// sync : {consume to what can follow sync} ;
// </pre>
//
// At the start of a sub rule upon error, {@link //sync} performs single
// token deletion, if possible. If it can't do that, it bails on the current
// rule and uses the default error recovery, which consumes until the
// resynchronization set of the current rule.
//
// <p>If the sub rule is optional ({@code (...)?}, {@code (...)*}, or block
// with an empty alternative), then the expected set includes what follows
// the subrule.</p>
//
// <p>During loop iteration, it consumes until it sees a token that can start a
// sub rule or what follows loop. Yes, that is pretty aggressive. We opt to
// stay in the loop as long as possible.</p>
//
// <p><strong>ORIGINS</strong></p>
//
// <p>Previous versions of ANTLR did a poor job of their recovery within loops.
// A single mismatch token or missing token would force the parser to bail
// out of the entire rules surrounding the loop. So, for rule</p>
//
// <pre>
// classDef : 'class' ID '{' member* '}'
// </pre>
//
// input with an extra token between members would force the parser to
// consume until it found the next class definition rather than the next
// member definition of the current class.
//
// <p>This functionality cost a little bit of effort because the parser has to
// compare token set at the start of the loop and at each iteration. If for
// some reason speed is suffering for you, you can turn off this
// functionality by simply overriding this method as a blank { }.</p>
//
DefaultErrorStrategy.prototype.sync = function(recognizer) {
    // If already recovering, don't try to sync
    if (this.inErrorRecoveryMode(recognizer)) {
        return;
    }
    var s = recognizer._interp.atn.states[recognizer.state];
    var la = recognizer.getTokenStream().LA(1);
    // try cheaper subset first; might get lucky. seems to shave a wee bit off
    var nextTokens = recognizer.atn.nextTokens(s);
    if (nextTokens.contains(Token.EPSILON) || nextTokens.contains(la)) {
        return;
    }
    switch (s.stateType) {
    case ATNState.BLOCK_START:
    case ATNState.STAR_BLOCK_START:
    case ATNState.PLUS_BLOCK_START:
    case ATNState.STAR_LOOP_ENTRY:
       // report error and recover if possible
        if( this.singleTokenDeletion(recognizer) !== null) {
            return;
        } else {
            throw new InputMismatchException(recognizer);
        }
        break;
    case ATNState.PLUS_LOOP_BACK:
    case ATNState.STAR_LOOP_BACK:
        this.reportUnwantedToken(recognizer);
        var expecting = new IntervalSet();
        expecting.addSet(recognizer.getExpectedTokens());
        var whatFollowsLoopIterationOrRule = expecting.addSet(this.getErrorRecoverySet(recognizer));
        this.consumeUntil(recognizer, whatFollowsLoopIterationOrRule);
        break;
    default:
        // do nothing if we can't identify the exact kind of ATN state
    }
};

// This is called by {@link //reportError} when the exception is a
// {@link NoViableAltException}.
//
// @see //reportError
//
// @param recognizer the parser instance
// @param e the recognition exception
//
DefaultErrorStrategy.prototype.reportNoViableAlternative = function(recognizer, e) {
    var tokens = recognizer.getTokenStream();
    var input;
    if(tokens !== null) {
        if (e.startToken.type===Token.EOF) {
            input = "<EOF>";
        } else {
            input = tokens.getText(new Interval(e.startToken.tokenIndex, e.offendingToken.tokenIndex));
        }
    } else {
        input = "<unknown input>";
    }
    var msg = "no viable alternative at input " + this.escapeWSAndQuote(input);
    recognizer.notifyErrorListeners(msg, e.offendingToken, e);
};

//
// This is called by {@link //reportError} when the exception is an
// {@link InputMismatchException}.
//
// @see //reportError
//
// @param recognizer the parser instance
// @param e the recognition exception
//
DefaultErrorStrategy.prototype.reportInputMismatch = function(recognizer, e) {
    var msg = "mismatched input " + this.getTokenErrorDisplay(e.offendingToken) +
          " expecting " + e.getExpectedTokens().toString(recognizer.literalNames, recognizer.symbolicNames);
    recognizer.notifyErrorListeners(msg, e.offendingToken, e);
};

//
// This is called by {@link //reportError} when the exception is a
// {@link FailedPredicateException}.
//
// @see //reportError
//
// @param recognizer the parser instance
// @param e the recognition exception
//
DefaultErrorStrategy.prototype.reportFailedPredicate = function(recognizer, e) {
    var ruleName = recognizer.ruleNames[recognizer._ctx.ruleIndex];
    var msg = "rule " + ruleName + " " + e.message;
    recognizer.notifyErrorListeners(msg, e.offendingToken, e);
};

// This method is called to report a syntax error which requires the removal
// of a token from the input stream. At the time this method is called, the
// erroneous symbol is current {@code LT(1)} symbol and has not yet been
// removed from the input stream. When this method returns,
// {@code recognizer} is in error recovery mode.
//
// <p>This method is called when {@link //singleTokenDeletion} identifies
// single-token deletion as a viable recovery strategy for a mismatched
// input error.</p>
//
// <p>The default implementation simply returns if the handler is already in
// error recovery mode. Otherwise, it calls {@link //beginErrorCondition} to
// enter error recovery mode, followed by calling
// {@link Parser//notifyErrorListeners}.</p>
//
// @param recognizer the parser instance
//
DefaultErrorStrategy.prototype.reportUnwantedToken = function(recognizer) {
    if (this.inErrorRecoveryMode(recognizer)) {
        return;
    }
    this.beginErrorCondition(recognizer);
    var t = recognizer.getCurrentToken();
    var tokenName = this.getTokenErrorDisplay(t);
    var expecting = this.getExpectedTokens(recognizer);
    var msg = "extraneous input " + tokenName + " expecting " +
        expecting.toString(recognizer.literalNames, recognizer.symbolicNames);
    recognizer.notifyErrorListeners(msg, t, null);
};
// This method is called to report a syntax error which requires the
// insertion of a missing token into the input stream. At the time this
// method is called, the missing token has not yet been inserted. When this
// method returns, {@code recognizer} is in error recovery mode.
//
// <p>This method is called when {@link //singleTokenInsertion} identifies
// single-token insertion as a viable recovery strategy for a mismatched
// input error.</p>
//
// <p>The default implementation simply returns if the handler is already in
// error recovery mode. Otherwise, it calls {@link //beginErrorCondition} to
// enter error recovery mode, followed by calling
// {@link Parser//notifyErrorListeners}.</p>
//
// @param recognizer the parser instance
//
DefaultErrorStrategy.prototype.reportMissingToken = function(recognizer) {
    if ( this.inErrorRecoveryMode(recognizer)) {
        return;
    }
    this.beginErrorCondition(recognizer);
    var t = recognizer.getCurrentToken();
    var expecting = this.getExpectedTokens(recognizer);
    var msg = "missing " + expecting.toString(recognizer.literalNames, recognizer.symbolicNames) +
          " at " + this.getTokenErrorDisplay(t);
    recognizer.notifyErrorListeners(msg, t, null);
};

// <p>The default implementation attempts to recover from the mismatched input
// by using single token insertion and deletion as described below. If the
// recovery attempt fails, this method throws an
// {@link InputMismatchException}.</p>
//
// <p><strong>EXTRA TOKEN</strong> (single token deletion)</p>
//
// <p>{@code LA(1)} is not what we are looking for. If {@code LA(2)} has the
// right token, however, then assume {@code LA(1)} is some extra spurious
// token and delete it. Then consume and return the next token (which was
// the {@code LA(2)} token) as the successful result of the match operation.</p>
//
// <p>This recovery strategy is implemented by {@link
// //singleTokenDeletion}.</p>
//
// <p><strong>MISSING TOKEN</strong> (single token insertion)</p>
//
// <p>If current token (at {@code LA(1)}) is consistent with what could come
// after the expected {@code LA(1)} token, then assume the token is missing
// and use the parser's {@link TokenFactory} to create it on the fly. The
// "insertion" is performed by returning the created token as the successful
// result of the match operation.</p>
//
// <p>This recovery strategy is implemented by {@link
// //singleTokenInsertion}.</p>
//
// <p><strong>EXAMPLE</strong></p>
//
// <p>For example, Input {@code i=(3;} is clearly missing the {@code ')'}. When
// the parser returns from the nested call to {@code expr}, it will have
// call chain:</p>
//
// <pre>
// stat &rarr; expr &rarr; atom
// </pre>
//
// and it will be trying to match the {@code ')'} at this point in the
// derivation:
//
// <pre>
// =&gt; ID '=' '(' INT ')' ('+' atom)* ';'
// ^
// </pre>
//
// The attempt to match {@code ')'} will fail when it sees {@code ';'} and
// call {@link //recoverInline}. To recover, it sees that {@code LA(1)==';'}
// is in the set of tokens that can follow the {@code ')'} token reference
// in rule {@code atom}. It can assume that you forgot the {@code ')'}.
//
DefaultErrorStrategy.prototype.recoverInline = function(recognizer) {
    // SINGLE TOKEN DELETION
    var matchedSymbol = this.singleTokenDeletion(recognizer);
    if (matchedSymbol !== null) {
        // we have deleted the extra token.
        // now, move past ttype token as if all were ok
        recognizer.consume();
        return matchedSymbol;
    }
    // SINGLE TOKEN INSERTION
    if (this.singleTokenInsertion(recognizer)) {
        return this.getMissingSymbol(recognizer);
    }
    // even that didn't work; must throw the exception
    throw new InputMismatchException(recognizer);
};

//
// This method implements the single-token insertion inline error recovery
// strategy. It is called by {@link //recoverInline} if the single-token
// deletion strategy fails to recover from the mismatched input. If this
// method returns {@code true}, {@code recognizer} will be in error recovery
// mode.
//
// <p>This method determines whether or not single-token insertion is viable by
// checking if the {@code LA(1)} input symbol could be successfully matched
// if it were instead the {@code LA(2)} symbol. If this method returns
// {@code true}, the caller is responsible for creating and inserting a
// token with the correct type to produce this behavior.</p>
//
// @param recognizer the parser instance
// @return {@code true} if single-token insertion is a viable recovery
// strategy for the current mismatched input, otherwise {@code false}
//
DefaultErrorStrategy.prototype.singleTokenInsertion = function(recognizer) {
    var currentSymbolType = recognizer.getTokenStream().LA(1);
    // if current token is consistent with what could come after current
    // ATN state, then we know we're missing a token; error recovery
    // is free to conjure up and insert the missing token
    var atn = recognizer._interp.atn;
    var currentState = atn.states[recognizer.state];
    var next = currentState.transitions[0].target;
    var expectingAtLL2 = atn.nextTokens(next, recognizer._ctx);
    if (expectingAtLL2.contains(currentSymbolType) ){
        this.reportMissingToken(recognizer);
        return true;
    } else {
        return false;
    }
};

// This method implements the single-token deletion inline error recovery
// strategy. It is called by {@link //recoverInline} to attempt to recover
// from mismatched input. If this method returns null, the parser and error
// handler state will not have changed. If this method returns non-null,
// {@code recognizer} will <em>not</em> be in error recovery mode since the
// returned token was a successful match.
//
// <p>If the single-token deletion is successful, this method calls
// {@link //reportUnwantedToken} to report the error, followed by
// {@link Parser//consume} to actually "delete" the extraneous token. Then,
// before returning {@link //reportMatch} is called to signal a successful
// match.</p>
//
// @param recognizer the parser instance
// @return the successfully matched {@link Token} instance if single-token
// deletion successfully recovers from the mismatched input, otherwise
// {@code null}
//
DefaultErrorStrategy.prototype.singleTokenDeletion = function(recognizer) {
    var nextTokenType = recognizer.getTokenStream().LA(2);
    var expecting = this.getExpectedTokens(recognizer);
    if (expecting.contains(nextTokenType)) {
        this.reportUnwantedToken(recognizer);
        // print("recoverFromMismatchedToken deleting " \
        // + str(recognizer.getTokenStream().LT(1)) \
        // + " since " + str(recognizer.getTokenStream().LT(2)) \
        // + " is what we want", file=sys.stderr)
        recognizer.consume(); // simply delete extra token
        // we want to return the token we're actually matching
        var matchedSymbol = recognizer.getCurrentToken();
        this.reportMatch(recognizer); // we know current token is correct
        return matchedSymbol;
    } else {
        return null;
    }
};

// Conjure up a missing token during error recovery.
//
// The recognizer attempts to recover from single missing
// symbols. But, actions might refer to that missing symbol.
// For example, x=ID {f($x);}. The action clearly assumes
// that there has been an identifier matched previously and that
// $x points at that token. If that token is missing, but
// the next token in the stream is what we want we assume that
// this token is missing and we keep going. Because we
// have to return some token to replace the missing token,
// we have to conjure one up. This method gives the user control
// over the tokens returned for missing tokens. Mostly,
// you will want to create something special for identifier
// tokens. For literals such as '{' and ',', the default
// action in the parser or tree parser works. It simply creates
// a CommonToken of the appropriate type. The text will be the token.
// If you change what tokens must be created by the lexer,
// override this method to create the appropriate tokens.
//
DefaultErrorStrategy.prototype.getMissingSymbol = function(recognizer) {
    var currentSymbol = recognizer.getCurrentToken();
    var expecting = this.getExpectedTokens(recognizer);
    var expectedTokenType = expecting.first(); // get any element
    var tokenText;
    if (expectedTokenType===Token.EOF) {
        tokenText = "<missing EOF>";
    } else {
        tokenText = "<missing " + recognizer.literalNames[expectedTokenType] + ">";
    }
    var current = currentSymbol;
    var lookback = recognizer.getTokenStream().LT(-1);
    if (current.type===Token.EOF && lookback !== null) {
        current = lookback;
    }
    return recognizer.getTokenFactory().create(current.source,
        expectedTokenType, tokenText, Token.DEFAULT_CHANNEL,
        -1, -1, current.line, current.column);
};

DefaultErrorStrategy.prototype.getExpectedTokens = function(recognizer) {
    return recognizer.getExpectedTokens();
};

// How should a token be displayed in an error message? The default
// is to display just the text, but during development you might
// want to have a lot of information spit out. Override in that case
// to use t.toString() (which, for CommonToken, dumps everything about
// the token). This is better than forcing you to override a method in
// your token objects because you don't have to go modify your lexer
// so that it creates a new Java type.
//
DefaultErrorStrategy.prototype.getTokenErrorDisplay = function(t) {
    if (t === null) {
        return "<no token>";
    }
    var s = t.text;
    if (s === null) {
        if (t.type===Token.EOF) {
            s = "<EOF>";
        } else {
            s = "<" + t.type + ">";
        }
    }
    return this.escapeWSAndQuote(s);
};

DefaultErrorStrategy.prototype.escapeWSAndQuote = function(s) {
    s = s.replace(/\n/g,"\\n");
    s = s.replace(/\r/g,"\\r");
    s = s.replace(/\t/g,"\\t");
    return "'" + s + "'";
};

// Compute the error recovery set for the current rule. During
// rule invocation, the parser pushes the set of tokens that can
// follow that rule reference on the stack; this amounts to
// computing FIRST of what follows the rule reference in the
// enclosing rule. See LinearApproximator.FIRST().
// This local follow set only includes tokens
// from within the rule; i.e., the FIRST computation done by
// ANTLR stops at the end of a rule.
//
// EXAMPLE
//
// When you find a "no viable alt exception", the input is not
// consistent with any of the alternatives for rule r. The best
// thing to do is to consume tokens until you see something that
// can legally follow a call to r//or* any rule that called r.
// You don't want the exact set of viable next tokens because the
// input might just be missing a token--you might consume the
// rest of the input looking for one of the missing tokens.
//
// Consider grammar:
//
// a : '[' b ']'
// | '(' b ')'
// ;
// b : c '^' INT ;
// c : ID
// | INT
// ;
//
// At each rule invocation, the set of tokens that could follow
// that rule is pushed on a stack. Here are the various
// context-sensitive follow sets:
//
// FOLLOW(b1_in_a) = FIRST(']') = ']'
// FOLLOW(b2_in_a) = FIRST(')') = ')'
// FOLLOW(c_in_b) = FIRST('^') = '^'
//
// Upon erroneous input "[]", the call chain is
//
// a -> b -> c
//
// and, hence, the follow context stack is:
//
// depth follow set start of rule execution
// 0 <EOF> a (from main())
// 1 ']' b
// 2 '^' c
//
// Notice that ')' is not included, because b would have to have
// been called from a different context in rule a for ')' to be
// included.
//
// For error recovery, we cannot consider FOLLOW(c)
// (context-sensitive or otherwise). We need the combined set of
// all context-sensitive FOLLOW sets--the set of all tokens that
// could follow any reference in the call chain. We need to
// resync to one of those tokens. Note that FOLLOW(c)='^' and if
// we resync'd to that token, we'd consume until EOF. We need to
// sync to context-sensitive FOLLOWs for a, b, and c: {']','^'}.
// In this case, for input "[]", LA(1) is ']' and in the set, so we would
// not consume anything. After printing an error, rule c would
// return normally. Rule b would not find the required '^' though.
// At this point, it gets a mismatched token error and throws an
// exception (since LA(1) is not in the viable following token
// set). The rule exception handler tries to recover, but finds
// the same recovery set and doesn't consume anything. Rule b
// exits normally returning to rule a. Now it finds the ']' (and
// with the successful match exits errorRecovery mode).
//
// So, you can see that the parser walks up the call chain looking
// for the token that was a member of the recovery set.
//
// Errors are not generated in errorRecovery mode.
//
// ANTLR's error recovery mechanism is based upon original ideas:
//
// "Algorithms + Data Structures = Programs" by Niklaus Wirth
//
// and
//
// "A note on error recovery in recursive descent parsers":
// http://portal.acm.org/citation.cfm?id=947902.947905
//
// Later, Josef Grosch had some good ideas:
//
// "Efficient and Comfortable Error Recovery in Recursive Descent
// Parsers":
// ftp://www.cocolab.com/products/cocktail/doca4.ps/ell.ps.zip
//
// Like Grosch I implement context-sensitive FOLLOW sets that are combined
// at run-time upon error to avoid overhead during parsing.
//
DefaultErrorStrategy.prototype.getErrorRecoverySet = function(recognizer) {
    var atn = recognizer._interp.atn;
    var ctx = recognizer._ctx;
    var recoverSet = new IntervalSet();
    while (ctx !== null && ctx.invokingState>=0) {
        // compute what follows who invoked us
        var invokingState = atn.states[ctx.invokingState];
        var rt = invokingState.transitions[0];
        var follow = atn.nextTokens(rt.followState);
        recoverSet.addSet(follow);
        ctx = ctx.parentCtx;
    }
    recoverSet.removeOne(Token.EPSILON);
    return recoverSet;
};

// Consume tokens until one matches the given token set.//
DefaultErrorStrategy.prototype.consumeUntil = function(recognizer, set) {
    var ttype = recognizer.getTokenStream().LA(1);
    while( ttype !== Token.EOF && !set.contains(ttype)) {
        recognizer.consume();
        ttype = recognizer.getTokenStream().LA(1);
    }
};

//
// This implementation of {@link ANTLRErrorStrategy} responds to syntax errors
// by immediately canceling the parse operation with a
// {@link ParseCancellationException}. The implementation ensures that the
// {@link ParserRuleContext//exception} field is set for all parse tree nodes
// that were not completed prior to encountering the error.
//
// <p>
// This error strategy is useful in the following scenarios.</p>
//
// <ul>
// <li><strong>Two-stage parsing:</strong> This error strategy allows the first
// stage of two-stage parsing to immediately terminate if an error is
// encountered, and immediately fall back to the second stage. In addition to
// avoiding wasted work by attempting to recover from errors here, the empty
// implementation of {@link BailErrorStrategy//sync} improves the performance of
// the first stage.</li>
// <li><strong>Silent validation:</strong> When syntax errors are not being
// reported or logged, and the parse result is simply ignored if errors occur,
// the {@link BailErrorStrategy} avoids wasting work on recovering from errors
// when the result will be ignored either way.</li>
// </ul>
//
// <p>
// {@code myparser.setErrorHandler(new BailErrorStrategy());}</p>
//
// @see Parser//setErrorHandler(ANTLRErrorStrategy)
//
function BailErrorStrategy() {
	DefaultErrorStrategy.call(this);
	return this;
}

BailErrorStrategy.prototype = Object.create(DefaultErrorStrategy.prototype);
BailErrorStrategy.prototype.constructor = BailErrorStrategy;

// Instead of recovering from exception {@code e}, re-throw it wrapped
// in a {@link ParseCancellationException} so it is not caught by the
// rule function catches. Use {@link Exception//getCause()} to get the
// original {@link RecognitionException}.
//
BailErrorStrategy.prototype.recover = function(recognizer, e) {
    var context = recognizer._ctx;
    while (context !== null) {
        context.exception = e;
        context = context.parentCtx;
    }
    throw new ParseCancellationException(e);
};

// Make sure we don't attempt to recover inline; if the parser
// successfully recovers, it won't throw an exception.
//
BailErrorStrategy.prototype.recoverInline = function(recognizer) {
    this.recover(recognizer, new InputMismatchException(recognizer));
};

// Make sure we don't attempt to recover from problems in subrules.//
BailErrorStrategy.prototype.sync = function(recognizer) {
    // pass
};

exports.BailErrorStrategy = BailErrorStrategy;
exports.DefaultErrorStrategy = DefaultErrorStrategy;


/***/ }),

/***/ "./node_modules/antlr4/error/Errors.js":
/*!*********************************************!*\
  !*** ./node_modules/antlr4/error/Errors.js ***!
  \*********************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

// The root of the ANTLR exception hierarchy. In general, ANTLR tracks just
//  3 kinds of errors: prediction errors, failed predicate errors, and
//  mismatched input errors. In each case, the parser knows where it is
//  in the input, where it is in the ATN, the rule invocation stack,
//  and what kind of problem occurred.

var PredicateTransition = __webpack_require__(/*! ./../atn/Transition */ "./node_modules/antlr4/atn/Transition.js").PredicateTransition;

function RecognitionException(params) {
	Error.call(this);
	if (!!Error.captureStackTrace) {
        Error.captureStackTrace(this, RecognitionException);
	} else {
		var stack = new Error().stack;
	}
	this.message = params.message;
    this.recognizer = params.recognizer;
    this.input = params.input;
    this.ctx = params.ctx;
    // The current {@link Token} when an error occurred. Since not all streams
    // support accessing symbols by index, we have to track the {@link Token}
    // instance itself.
    this.offendingToken = null;
    // Get the ATN state number the parser was in at the time the error
    // occurred. For {@link NoViableAltException} and
    // {@link LexerNoViableAltException} exceptions, this is the
    // {@link DecisionState} number. For others, it is the state whose outgoing
    // edge we couldn't match.
    this.offendingState = -1;
    if (this.recognizer!==null) {
        this.offendingState = this.recognizer.state;
    }
    return this;
}

RecognitionException.prototype = Object.create(Error.prototype);
RecognitionException.prototype.constructor = RecognitionException;

// <p>If the state number is not known, this method returns -1.</p>

//
// Gets the set of input symbols which could potentially follow the
// previously matched symbol at the time this exception was thrown.
//
// <p>If the set of expected tokens is not known and could not be computed,
// this method returns {@code null}.</p>
//
// @return The set of token types that could potentially follow the current
// state in the ATN, or {@code null} if the information is not available.
// /
RecognitionException.prototype.getExpectedTokens = function() {
    if (this.recognizer!==null) {
        return this.recognizer.atn.getExpectedTokens(this.offendingState, this.ctx);
    } else {
        return null;
    }
};

RecognitionException.prototype.toString = function() {
    return this.message;
};

function LexerNoViableAltException(lexer, input, startIndex, deadEndConfigs) {
	RecognitionException.call(this, {message:"", recognizer:lexer, input:input, ctx:null});
    this.startIndex = startIndex;
    this.deadEndConfigs = deadEndConfigs;
    return this;
}

LexerNoViableAltException.prototype = Object.create(RecognitionException.prototype);
LexerNoViableAltException.prototype.constructor = LexerNoViableAltException;

LexerNoViableAltException.prototype.toString = function() {
    var symbol = "";
    if (this.startIndex >= 0 && this.startIndex < this.input.size) {
        symbol = this.input.getText((this.startIndex,this.startIndex));
    }
    return "LexerNoViableAltException" + symbol;
};

// Indicates that the parser could not decide which of two or more paths
// to take based upon the remaining input. It tracks the starting token
// of the offending input and also knows where the parser was
// in the various paths when the error. Reported by reportNoViableAlternative()
//
function NoViableAltException(recognizer, input, startToken, offendingToken, deadEndConfigs, ctx) {
	ctx = ctx || recognizer._ctx;
	offendingToken = offendingToken || recognizer.getCurrentToken();
	startToken = startToken || recognizer.getCurrentToken();
	input = input || recognizer.getInputStream();
	RecognitionException.call(this, {message:"", recognizer:recognizer, input:input, ctx:ctx});
    // Which configurations did we try at input.index() that couldn't match
	// input.LT(1)?//
    this.deadEndConfigs = deadEndConfigs;
    // The token object at the start index; the input stream might
    // not be buffering tokens so get a reference to it. (At the
    // time the error occurred, of course the stream needs to keep a
    // buffer all of the tokens but later we might not have access to those.)
    this.startToken = startToken;
    this.offendingToken = offendingToken;
}

NoViableAltException.prototype = Object.create(RecognitionException.prototype);
NoViableAltException.prototype.constructor = NoViableAltException;

// This signifies any kind of mismatched input exceptions such as
// when the current input does not match the expected token.
//
function InputMismatchException(recognizer) {
	RecognitionException.call(this, {message:"", recognizer:recognizer, input:recognizer.getInputStream(), ctx:recognizer._ctx});
    this.offendingToken = recognizer.getCurrentToken();
}

InputMismatchException.prototype = Object.create(RecognitionException.prototype);
InputMismatchException.prototype.constructor = InputMismatchException;

// A semantic predicate failed during validation. Validation of predicates
// occurs when normally parsing the alternative just like matching a token.
// Disambiguating predicate evaluation occurs when we test a predicate during
// prediction.

function FailedPredicateException(recognizer, predicate, message) {
	RecognitionException.call(this, {message:this.formatMessage(predicate,message || null), recognizer:recognizer,
                         input:recognizer.getInputStream(), ctx:recognizer._ctx});
    var s = recognizer._interp.atn.states[recognizer.state];
    var trans = s.transitions[0];
    if (trans instanceof PredicateTransition) {
        this.ruleIndex = trans.ruleIndex;
        this.predicateIndex = trans.predIndex;
    } else {
        this.ruleIndex = 0;
        this.predicateIndex = 0;
    }
    this.predicate = predicate;
    this.offendingToken = recognizer.getCurrentToken();
    return this;
}

FailedPredicateException.prototype = Object.create(RecognitionException.prototype);
FailedPredicateException.prototype.constructor = FailedPredicateException;

FailedPredicateException.prototype.formatMessage = function(predicate, message) {
    if (message !==null) {
        return message;
    } else {
        return "failed predicate: {" + predicate + "}?";
    }
};

function ParseCancellationException() {
	Error.call(this);
	Error.captureStackTrace(this, ParseCancellationException);
	return this;
}

ParseCancellationException.prototype = Object.create(Error.prototype);
ParseCancellationException.prototype.constructor = ParseCancellationException;

exports.RecognitionException = RecognitionException;
exports.NoViableAltException = NoViableAltException;
exports.LexerNoViableAltException = LexerNoViableAltException;
exports.InputMismatchException = InputMismatchException;
exports.FailedPredicateException = FailedPredicateException;
exports.ParseCancellationException = ParseCancellationException;


/***/ }),

/***/ "./node_modules/antlr4/error/index.js":
/*!********************************************!*\
  !*** ./node_modules/antlr4/error/index.js ***!
  \********************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

exports.RecognitionException = __webpack_require__(/*! ./Errors */ "./node_modules/antlr4/error/Errors.js").RecognitionException;
exports.NoViableAltException = __webpack_require__(/*! ./Errors */ "./node_modules/antlr4/error/Errors.js").NoViableAltException;
exports.LexerNoViableAltException = __webpack_require__(/*! ./Errors */ "./node_modules/antlr4/error/Errors.js").LexerNoViableAltException;
exports.InputMismatchException = __webpack_require__(/*! ./Errors */ "./node_modules/antlr4/error/Errors.js").InputMismatchException;
exports.FailedPredicateException = __webpack_require__(/*! ./Errors */ "./node_modules/antlr4/error/Errors.js").FailedPredicateException;
exports.DiagnosticErrorListener = __webpack_require__(/*! ./DiagnosticErrorListener */ "./node_modules/antlr4/error/DiagnosticErrorListener.js").DiagnosticErrorListener;
exports.BailErrorStrategy = __webpack_require__(/*! ./ErrorStrategy */ "./node_modules/antlr4/error/ErrorStrategy.js").BailErrorStrategy;
exports.ErrorListener = __webpack_require__(/*! ./ErrorListener */ "./node_modules/antlr4/error/ErrorListener.js").ErrorListener;


/***/ }),

/***/ "./node_modules/antlr4/index.js":
/*!**************************************!*\
  !*** ./node_modules/antlr4/index.js ***!
  \**************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
exports.atn = __webpack_require__(/*! ./atn/index */ "./node_modules/antlr4/atn/index.js");
exports.codepointat = __webpack_require__(/*! ./polyfills/codepointat */ "./node_modules/antlr4/polyfills/codepointat.js");
exports.dfa = __webpack_require__(/*! ./dfa/index */ "./node_modules/antlr4/dfa/index.js");
exports.fromcodepoint = __webpack_require__(/*! ./polyfills/fromcodepoint */ "./node_modules/antlr4/polyfills/fromcodepoint.js");
exports.tree = __webpack_require__(/*! ./tree/index */ "./node_modules/antlr4/tree/index.js");
exports.error = __webpack_require__(/*! ./error/index */ "./node_modules/antlr4/error/index.js");
exports.Token = __webpack_require__(/*! ./Token */ "./node_modules/antlr4/Token.js").Token;
exports.CharStreams = __webpack_require__(/*! ./CharStreams */ "./node_modules/antlr4/CharStreams.js").CharStreams;
exports.CommonToken = __webpack_require__(/*! ./Token */ "./node_modules/antlr4/Token.js").CommonToken;
exports.InputStream = __webpack_require__(/*! ./InputStream */ "./node_modules/antlr4/InputStream.js").InputStream;
exports.FileStream = __webpack_require__(/*! ./FileStream */ "./node_modules/antlr4/FileStream.js").FileStream;
exports.CommonTokenStream = __webpack_require__(/*! ./CommonTokenStream */ "./node_modules/antlr4/CommonTokenStream.js").CommonTokenStream;
exports.Lexer = __webpack_require__(/*! ./Lexer */ "./node_modules/antlr4/Lexer.js").Lexer;
exports.Parser = __webpack_require__(/*! ./Parser */ "./node_modules/antlr4/Parser.js").Parser;
var pc = __webpack_require__(/*! ./PredictionContext */ "./node_modules/antlr4/PredictionContext.js");
exports.PredictionContextCache = pc.PredictionContextCache;
exports.ParserRuleContext = __webpack_require__(/*! ./ParserRuleContext */ "./node_modules/antlr4/ParserRuleContext.js").ParserRuleContext;
exports.Interval = __webpack_require__(/*! ./IntervalSet */ "./node_modules/antlr4/IntervalSet.js").Interval;
exports.Utils = __webpack_require__(/*! ./Utils */ "./node_modules/antlr4/Utils.js");


/***/ }),

/***/ "./node_modules/antlr4/polyfills/codepointat.js":
/*!******************************************************!*\
  !*** ./node_modules/antlr4/polyfills/codepointat.js ***!
  \******************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

/*! https://mths.be/codepointat v0.2.0 by @mathias */
if (!String.prototype.codePointAt) {
	(function() {
		'use strict'; // needed to support `apply`/`call` with `undefined`/`null`
		var defineProperty = (function() {
			// IE 8 only supports `Object.defineProperty` on DOM elements
			try {
				var object = {};
				var $defineProperty = Object.defineProperty;
				var result = $defineProperty(object, object, object) && $defineProperty;
			} catch(error) {}
			return result;
		}());
		var codePointAt = function(position) {
			if (this == null) {
				throw TypeError();
			}
			var string = String(this);
			var size = string.length;
			// `ToInteger`
			var index = position ? Number(position) : 0;
			if (index != index) { // better `isNaN`
				index = 0;
			}
			// Account for out-of-bounds indices:
			if (index < 0 || index >= size) {
				return undefined;
			}
			// Get the first code unit
			var first = string.charCodeAt(index);
			var second;
			if ( // check if it’s the start of a surrogate pair
				first >= 0xD800 && first <= 0xDBFF && // high surrogate
				size > index + 1 // there is a next code unit
			) {
				second = string.charCodeAt(index + 1);
				if (second >= 0xDC00 && second <= 0xDFFF) { // low surrogate
					// https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
					return (first - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
				}
			}
			return first;
		};
		if (defineProperty) {
			defineProperty(String.prototype, 'codePointAt', {
				'value': codePointAt,
				'configurable': true,
				'writable': true
			});
		} else {
			String.prototype.codePointAt = codePointAt;
		}
	}());
}


/***/ }),

/***/ "./node_modules/antlr4/polyfills/fromcodepoint.js":
/*!********************************************************!*\
  !*** ./node_modules/antlr4/polyfills/fromcodepoint.js ***!
  \********************************************************/
/*! no static exports found */
/***/ (function(module, exports) {

/*! https://mths.be/fromcodepoint v0.2.1 by @mathias */
if (!String.fromCodePoint) {
	(function() {
		var defineProperty = (function() {
			// IE 8 only supports `Object.defineProperty` on DOM elements
			try {
				var object = {};
				var $defineProperty = Object.defineProperty;
				var result = $defineProperty(object, object, object) && $defineProperty;
			} catch(error) {}
			return result;
		}());
		var stringFromCharCode = String.fromCharCode;
		var floor = Math.floor;
		var fromCodePoint = function(_) {
			var MAX_SIZE = 0x4000;
			var codeUnits = [];
			var highSurrogate;
			var lowSurrogate;
			var index = -1;
			var length = arguments.length;
			if (!length) {
				return '';
			}
			var result = '';
			while (++index < length) {
				var codePoint = Number(arguments[index]);
				if (
					!isFinite(codePoint) || // `NaN`, `+Infinity`, or `-Infinity`
					codePoint < 0 || // not a valid Unicode code point
					codePoint > 0x10FFFF || // not a valid Unicode code point
					floor(codePoint) != codePoint // not an integer
				) {
					throw RangeError('Invalid code point: ' + codePoint);
				}
				if (codePoint <= 0xFFFF) { // BMP code point
					codeUnits.push(codePoint);
				} else { // Astral code point; split in surrogate halves
					// https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
					codePoint -= 0x10000;
					highSurrogate = (codePoint >> 10) + 0xD800;
					lowSurrogate = (codePoint % 0x400) + 0xDC00;
					codeUnits.push(highSurrogate, lowSurrogate);
				}
				if (index + 1 == length || codeUnits.length > MAX_SIZE) {
					result += stringFromCharCode.apply(null, codeUnits);
					codeUnits.length = 0;
				}
			}
			return result;
		};
		if (defineProperty) {
			defineProperty(String, 'fromCodePoint', {
				'value': fromCodePoint,
				'configurable': true,
				'writable': true
			});
		} else {
			String.fromCodePoint = fromCodePoint;
		}
	}());
}


/***/ }),

/***/ "./node_modules/antlr4/tree/Tree.js":
/*!******************************************!*\
  !*** ./node_modules/antlr4/tree/Tree.js ***!
  \******************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */
///

// The basic notion of a tree has a parent, a payload, and a list of children.
//  It is the most abstract interface for all the trees used by ANTLR.
///

var Token = __webpack_require__(/*! ./../Token */ "./node_modules/antlr4/Token.js").Token;
var Interval = __webpack_require__(/*! ./../IntervalSet */ "./node_modules/antlr4/IntervalSet.js").Interval;
var INVALID_INTERVAL = new Interval(-1, -2);
var Utils = __webpack_require__(/*! ../Utils.js */ "./node_modules/antlr4/Utils.js");


function Tree() {
	return this;
}

function SyntaxTree() {
	Tree.call(this);
	return this;
}

SyntaxTree.prototype = Object.create(Tree.prototype);
SyntaxTree.prototype.constructor = SyntaxTree;

function ParseTree() {
	SyntaxTree.call(this);
	return this;
}

ParseTree.prototype = Object.create(SyntaxTree.prototype);
ParseTree.prototype.constructor = ParseTree;

function RuleNode() {
	ParseTree.call(this);
	return this;
}

RuleNode.prototype = Object.create(ParseTree.prototype);
RuleNode.prototype.constructor = RuleNode;

function TerminalNode() {
	ParseTree.call(this);
	return this;
}

TerminalNode.prototype = Object.create(ParseTree.prototype);
TerminalNode.prototype.constructor = TerminalNode;

function ErrorNode() {
	TerminalNode.call(this);
	return this;
}

ErrorNode.prototype = Object.create(TerminalNode.prototype);
ErrorNode.prototype.constructor = ErrorNode;

function ParseTreeVisitor() {
	return this;
}

ParseTreeVisitor.prototype.visit = function(ctx) {
 	if (Array.isArray(ctx)) {
		return ctx.map(function(child) {
            return child.accept(this);
        }, this);
	} else {
		return ctx.accept(this);
	}
};

ParseTreeVisitor.prototype.visitChildren = function(ctx) {
	if (ctx.children) {
		return this.visit(ctx.children);
	} else {
		return null;
	}
}

ParseTreeVisitor.prototype.visitTerminal = function(node) {
};

ParseTreeVisitor.prototype.visitErrorNode = function(node) {
};


function ParseTreeListener() {
	return this;
}

ParseTreeListener.prototype.visitTerminal = function(node) {
};

ParseTreeListener.prototype.visitErrorNode = function(node) {
};

ParseTreeListener.prototype.enterEveryRule = function(node) {
};

ParseTreeListener.prototype.exitEveryRule = function(node) {
};

function TerminalNodeImpl(symbol) {
	TerminalNode.call(this);
	this.parentCtx = null;
	this.symbol = symbol;
	return this;
}

TerminalNodeImpl.prototype = Object.create(TerminalNode.prototype);
TerminalNodeImpl.prototype.constructor = TerminalNodeImpl;

TerminalNodeImpl.prototype.getChild = function(i) {
	return null;
};

TerminalNodeImpl.prototype.getSymbol = function() {
	return this.symbol;
};

TerminalNodeImpl.prototype.getParent = function() {
	return this.parentCtx;
};

TerminalNodeImpl.prototype.getPayload = function() {
	return this.symbol;
};

TerminalNodeImpl.prototype.getSourceInterval = function() {
	if (this.symbol === null) {
		return INVALID_INTERVAL;
	}
	var tokenIndex = this.symbol.tokenIndex;
	return new Interval(tokenIndex, tokenIndex);
};

TerminalNodeImpl.prototype.getChildCount = function() {
	return 0;
};

TerminalNodeImpl.prototype.accept = function(visitor) {
	return visitor.visitTerminal(this);
};

TerminalNodeImpl.prototype.getText = function() {
	return this.symbol.text;
};

TerminalNodeImpl.prototype.toString = function() {
	if (this.symbol.type === Token.EOF) {
		return "<EOF>";
	} else {
		return this.symbol.text;
	}
};

// Represents a token that was consumed during resynchronization
// rather than during a valid match operation. For example,
// we will create this kind of a node during single token insertion
// and deletion as well as during "consume until error recovery set"
// upon no viable alternative exceptions.

function ErrorNodeImpl(token) {
	TerminalNodeImpl.call(this, token);
	return this;
}

ErrorNodeImpl.prototype = Object.create(TerminalNodeImpl.prototype);
ErrorNodeImpl.prototype.constructor = ErrorNodeImpl;

ErrorNodeImpl.prototype.isErrorNode = function() {
	return true;
};

ErrorNodeImpl.prototype.accept = function(visitor) {
	return visitor.visitErrorNode(this);
};

function ParseTreeWalker() {
	return this;
}

ParseTreeWalker.prototype.walk = function(listener, t) {
	var errorNode = t instanceof ErrorNode ||
			(t.isErrorNode !== undefined && t.isErrorNode());
	if (errorNode) {
		listener.visitErrorNode(t);
	} else if (t instanceof TerminalNode) {
		listener.visitTerminal(t);
	} else {
		this.enterRule(listener, t);
		for (var i = 0; i < t.getChildCount(); i++) {
			var child = t.getChild(i);
			this.walk(listener, child);
		}
		this.exitRule(listener, t);
	}
};
//
// The discovery of a rule node, involves sending two events: the generic
// {@link ParseTreeListener//enterEveryRule} and a
// {@link RuleContext}-specific event. First we trigger the generic and then
// the rule specific. We to them in reverse order upon finishing the node.
//
ParseTreeWalker.prototype.enterRule = function(listener, r) {
	var ctx = r.getRuleContext();
	listener.enterEveryRule(ctx);
	ctx.enterRule(listener);
};

ParseTreeWalker.prototype.exitRule = function(listener, r) {
	var ctx = r.getRuleContext();
	ctx.exitRule(listener);
	listener.exitEveryRule(ctx);
};

ParseTreeWalker.DEFAULT = new ParseTreeWalker();

exports.RuleNode = RuleNode;
exports.ErrorNode = ErrorNode;
exports.TerminalNode = TerminalNode;
exports.ErrorNodeImpl = ErrorNodeImpl;
exports.TerminalNodeImpl = TerminalNodeImpl;
exports.ParseTreeListener = ParseTreeListener;
exports.ParseTreeVisitor = ParseTreeVisitor;
exports.ParseTreeWalker = ParseTreeWalker;
exports.INVALID_INTERVAL = INVALID_INTERVAL;


/***/ }),

/***/ "./node_modules/antlr4/tree/Trees.js":
/*!*******************************************!*\
  !*** ./node_modules/antlr4/tree/Trees.js ***!
  \*******************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

var Utils = __webpack_require__(/*! ./../Utils */ "./node_modules/antlr4/Utils.js");
var Token = __webpack_require__(/*! ./../Token */ "./node_modules/antlr4/Token.js").Token;
var RuleNode = __webpack_require__(/*! ./Tree */ "./node_modules/antlr4/tree/Tree.js").RuleNode;
var ErrorNode = __webpack_require__(/*! ./Tree */ "./node_modules/antlr4/tree/Tree.js").ErrorNode;
var TerminalNode = __webpack_require__(/*! ./Tree */ "./node_modules/antlr4/tree/Tree.js").TerminalNode;
var ParserRuleContext = __webpack_require__(/*! ./../ParserRuleContext */ "./node_modules/antlr4/ParserRuleContext.js").ParserRuleContext;
var RuleContext = __webpack_require__(/*! ./../RuleContext */ "./node_modules/antlr4/RuleContext.js").RuleContext;
var INVALID_ALT_NUMBER = __webpack_require__(/*! ./../atn/ATN */ "./node_modules/antlr4/atn/ATN.js").INVALID_ALT_NUMBER;


/** A set of utility routines useful for all kinds of ANTLR trees. */
function Trees() {
}

// Print out a whole tree in LISP form. {@link //getNodeText} is used on the
//  node payloads to get the text for the nodes.  Detect
//  parse trees and extract data appropriately.
Trees.toStringTree = function(tree, ruleNames, recog) {
	ruleNames = ruleNames || null;
	recog = recog || null;
    if(recog!==null) {
       ruleNames = recog.ruleNames;
    }
    var s = Trees.getNodeText(tree, ruleNames);
    s = Utils.escapeWhitespace(s, false);
    var c = tree.getChildCount();
    if(c===0) {
        return s;
    }
    var res = "(" + s + ' ';
    if(c>0) {
        s = Trees.toStringTree(tree.getChild(0), ruleNames);
        res = res.concat(s);
    }
    for(var i=1;i<c;i++) {
        s = Trees.toStringTree(tree.getChild(i), ruleNames);
        res = res.concat(' ' + s);
    }
    res = res.concat(")");
    return res;
};

Trees.getNodeText = function(t, ruleNames, recog) {
	ruleNames = ruleNames || null;
	recog = recog || null;
    if(recog!==null) {
        ruleNames = recog.ruleNames;
    }
    if(ruleNames!==null) {
       if (t instanceof RuleContext) {
           var altNumber = t.getAltNumber();
           if ( altNumber!=INVALID_ALT_NUMBER ) {
               return ruleNames[t.ruleIndex]+":"+altNumber;
           }
           return ruleNames[t.ruleIndex];
       } else if ( t instanceof ErrorNode) {
           return t.toString();
       } else if(t instanceof TerminalNode) {
           if(t.symbol!==null) {
               return t.symbol.text;
           }
       }
    }
    // no recog for rule names
    var payload = t.getPayload();
    if (payload instanceof Token ) {
       return payload.text;
    }
    return t.getPayload().toString();
};


// Return ordered list of all children of this node
Trees.getChildren = function(t) {
	var list = [];
	for(var i=0;i<t.getChildCount();i++) {
		list.push(t.getChild(i));
	}
	return list;
};

// Return a list of all ancestors of this node.  The first node of
//  list is the root and the last is the parent of this node.
//
Trees.getAncestors = function(t) {
    var ancestors = [];
    t = t.getParent();
    while(t!==null) {
        ancestors = [t].concat(ancestors);
        t = t.getParent();
    }
    return ancestors;
};

Trees.findAllTokenNodes = function(t, ttype) {
    return Trees.findAllNodes(t, ttype, true);
};

Trees.findAllRuleNodes = function(t, ruleIndex) {
	return Trees.findAllNodes(t, ruleIndex, false);
};

Trees.findAllNodes = function(t, index, findTokens) {
	var nodes = [];
	Trees._findAllNodes(t, index, findTokens, nodes);
	return nodes;
};

Trees._findAllNodes = function(t, index, findTokens, nodes) {
	// check this node (the root) first
	if(findTokens && (t instanceof TerminalNode)) {
		if(t.symbol.type===index) {
			nodes.push(t);
		}
	} else if(!findTokens && (t instanceof ParserRuleContext)) {
		if(t.ruleIndex===index) {
			nodes.push(t);
		}
	}
	// check children
	for(var i=0;i<t.getChildCount();i++) {
		Trees._findAllNodes(t.getChild(i), index, findTokens, nodes);
	}
};

Trees.descendants = function(t) {
	var nodes = [t];
    for(var i=0;i<t.getChildCount();i++) {
        nodes = nodes.concat(Trees.descendants(t.getChild(i)));
    }
    return nodes;
};


exports.Trees = Trees;

/***/ }),

/***/ "./node_modules/antlr4/tree/index.js":
/*!*******************************************!*\
  !*** ./node_modules/antlr4/tree/index.js ***!
  \*******************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
 * Use of this file is governed by the BSD 3-clause license that
 * can be found in the LICENSE.txt file in the project root.
 */

var Tree = __webpack_require__(/*! ./Tree */ "./node_modules/antlr4/tree/Tree.js");
exports.Trees = __webpack_require__(/*! ./Trees */ "./node_modules/antlr4/tree/Trees.js").Trees;
exports.RuleNode = Tree.RuleNode;
exports.ParseTreeListener = Tree.ParseTreeListener;
exports.ParseTreeVisitor = Tree.ParseTreeVisitor;
exports.ParseTreeWalker = Tree.ParseTreeWalker;


/***/ }),

/***/ "./node_modules/codemirror/addon/edit/closebrackets.js":
/*!*************************************************************!*\
  !*** ./node_modules/codemirror/addon/edit/closebrackets.js ***!
  \*************************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

(function(mod) {
  if (true) // CommonJS
    mod(__webpack_require__(/*! ../../lib/codemirror */ "./node_modules/codemirror/lib/codemirror.js"));
  else {}
})(function(CodeMirror) {
  var defaults = {
    pairs: "()[]{}''\"\"",
    closeBefore: ")]}'\":;>",
    triples: "",
    explode: "[]{}"
  };

  var Pos = CodeMirror.Pos;

  CodeMirror.defineOption("autoCloseBrackets", false, function(cm, val, old) {
    if (old && old != CodeMirror.Init) {
      cm.removeKeyMap(keyMap);
      cm.state.closeBrackets = null;
    }
    if (val) {
      ensureBound(getOption(val, "pairs"))
      cm.state.closeBrackets = val;
      cm.addKeyMap(keyMap);
    }
  });

  function getOption(conf, name) {
    if (name == "pairs" && typeof conf == "string") return conf;
    if (typeof conf == "object" && conf[name] != null) return conf[name];
    return defaults[name];
  }

  var keyMap = {Backspace: handleBackspace, Enter: handleEnter};
  function ensureBound(chars) {
    for (var i = 0; i < chars.length; i++) {
      var ch = chars.charAt(i), key = "'" + ch + "'"
      if (!keyMap[key]) keyMap[key] = handler(ch)
    }
  }
  ensureBound(defaults.pairs + "`")

  function handler(ch) {
    return function(cm) { return handleChar(cm, ch); };
  }

  function getConfig(cm) {
    var deflt = cm.state.closeBrackets;
    if (!deflt || deflt.override) return deflt;
    var mode = cm.getModeAt(cm.getCursor());
    return mode.closeBrackets || deflt;
  }

  function handleBackspace(cm) {
    var conf = getConfig(cm);
    if (!conf || cm.getOption("disableInput")) return CodeMirror.Pass;

    var pairs = getOption(conf, "pairs");
    var ranges = cm.listSelections();
    for (var i = 0; i < ranges.length; i++) {
      if (!ranges[i].empty()) return CodeMirror.Pass;
      var around = charsAround(cm, ranges[i].head);
      if (!around || pairs.indexOf(around) % 2 != 0) return CodeMirror.Pass;
    }
    for (var i = ranges.length - 1; i >= 0; i--) {
      var cur = ranges[i].head;
      cm.replaceRange("", Pos(cur.line, cur.ch - 1), Pos(cur.line, cur.ch + 1), "+delete");
    }
  }

  function handleEnter(cm) {
    var conf = getConfig(cm);
    var explode = conf && getOption(conf, "explode");
    if (!explode || cm.getOption("disableInput")) return CodeMirror.Pass;

    var ranges = cm.listSelections();
    for (var i = 0; i < ranges.length; i++) {
      if (!ranges[i].empty()) return CodeMirror.Pass;
      var around = charsAround(cm, ranges[i].head);
      if (!around || explode.indexOf(around) % 2 != 0) return CodeMirror.Pass;
    }
    cm.operation(function() {
      var linesep = cm.lineSeparator() || "\n";
      cm.replaceSelection(linesep + linesep, null);
      cm.execCommand("goCharLeft");
      ranges = cm.listSelections();
      for (var i = 0; i < ranges.length; i++) {
        var line = ranges[i].head.line;
        cm.indentLine(line, null, true);
        cm.indentLine(line + 1, null, true);
      }
    });
  }

  function contractSelection(sel) {
    var inverted = CodeMirror.cmpPos(sel.anchor, sel.head) > 0;
    return {anchor: new Pos(sel.anchor.line, sel.anchor.ch + (inverted ? -1 : 1)),
            head: new Pos(sel.head.line, sel.head.ch + (inverted ? 1 : -1))};
  }

  function handleChar(cm, ch) {
    var conf = getConfig(cm);
    if (!conf || cm.getOption("disableInput")) return CodeMirror.Pass;

    var pairs = getOption(conf, "pairs");
    var pos = pairs.indexOf(ch);
    if (pos == -1) return CodeMirror.Pass;

    var closeBefore = getOption(conf,"closeBefore");

    var triples = getOption(conf, "triples");

    var identical = pairs.charAt(pos + 1) == ch;
    var ranges = cm.listSelections();
    var opening = pos % 2 == 0;

    var type;
    for (var i = 0; i < ranges.length; i++) {
      var range = ranges[i], cur = range.head, curType;
      var next = cm.getRange(cur, Pos(cur.line, cur.ch + 1));
      if (opening && !range.empty()) {
        curType = "surround";
      } else if ((identical || !opening) && next == ch) {
        if (identical && stringStartsAfter(cm, cur))
          curType = "both";
        else if (triples.indexOf(ch) >= 0 && cm.getRange(cur, Pos(cur.line, cur.ch + 3)) == ch + ch + ch)
          curType = "skipThree";
        else
          curType = "skip";
      } else if (identical && cur.ch > 1 && triples.indexOf(ch) >= 0 &&
                 cm.getRange(Pos(cur.line, cur.ch - 2), cur) == ch + ch) {
        if (cur.ch > 2 && /\bstring/.test(cm.getTokenTypeAt(Pos(cur.line, cur.ch - 2)))) return CodeMirror.Pass;
        curType = "addFour";
      } else if (identical) {
        var prev = cur.ch == 0 ? " " : cm.getRange(Pos(cur.line, cur.ch - 1), cur)
        if (!CodeMirror.isWordChar(next) && prev != ch && !CodeMirror.isWordChar(prev)) curType = "both";
        else return CodeMirror.Pass;
      } else if (opening && (next.length === 0 || /\s/.test(next) || closeBefore.indexOf(next) > -1)) {
        curType = "both";
      } else {
        return CodeMirror.Pass;
      }
      if (!type) type = curType;
      else if (type != curType) return CodeMirror.Pass;
    }

    var left = pos % 2 ? pairs.charAt(pos - 1) : ch;
    var right = pos % 2 ? ch : pairs.charAt(pos + 1);
    cm.operation(function() {
      if (type == "skip") {
        cm.execCommand("goCharRight");
      } else if (type == "skipThree") {
        for (var i = 0; i < 3; i++)
          cm.execCommand("goCharRight");
      } else if (type == "surround") {
        var sels = cm.getSelections();
        for (var i = 0; i < sels.length; i++)
          sels[i] = left + sels[i] + right;
        cm.replaceSelections(sels, "around");
        sels = cm.listSelections().slice();
        for (var i = 0; i < sels.length; i++)
          sels[i] = contractSelection(sels[i]);
        cm.setSelections(sels);
      } else if (type == "both") {
        cm.replaceSelection(left + right, null);
        cm.triggerElectric(left + right);
        cm.execCommand("goCharLeft");
      } else if (type == "addFour") {
        cm.replaceSelection(left + left + left + left, "before");
        cm.execCommand("goCharRight");
      }
    });
  }

  function charsAround(cm, pos) {
    var str = cm.getRange(Pos(pos.line, pos.ch - 1),
                          Pos(pos.line, pos.ch + 1));
    return str.length == 2 ? str : null;
  }

  function stringStartsAfter(cm, pos) {
    var token = cm.getTokenAt(Pos(pos.line, pos.ch + 1))
    return /\bstring/.test(token.type) && token.start == pos.ch &&
      (pos.ch == 0 || !/\bstring/.test(cm.getTokenTypeAt(pos)))
  }
});


/***/ }),

/***/ "./node_modules/codemirror/addon/edit/matchbrackets.js":
/*!*************************************************************!*\
  !*** ./node_modules/codemirror/addon/edit/matchbrackets.js ***!
  \*************************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

(function(mod) {
  if (true) // CommonJS
    mod(__webpack_require__(/*! ../../lib/codemirror */ "./node_modules/codemirror/lib/codemirror.js"));
  else {}
})(function(CodeMirror) {
  var ie_lt8 = /MSIE \d/.test(navigator.userAgent) &&
    (document.documentMode == null || document.documentMode < 8);

  var Pos = CodeMirror.Pos;

  var matching = {"(": ")>", ")": "(<", "[": "]>", "]": "[<", "{": "}>", "}": "{<", "<": ">>", ">": "<<"};

  function bracketRegex(config) {
    return config && config.bracketRegex || /[(){}[\]]/
  }

  function findMatchingBracket(cm, where, config) {
    var line = cm.getLineHandle(where.line), pos = where.ch - 1;
    var afterCursor = config && config.afterCursor
    if (afterCursor == null)
      afterCursor = /(^| )cm-fat-cursor($| )/.test(cm.getWrapperElement().className)
    var re = bracketRegex(config)

    // A cursor is defined as between two characters, but in in vim command mode
    // (i.e. not insert mode), the cursor is visually represented as a
    // highlighted box on top of the 2nd character. Otherwise, we allow matches
    // from before or after the cursor.
    var match = (!afterCursor && pos >= 0 && re.test(line.text.charAt(pos)) && matching[line.text.charAt(pos)]) ||
        re.test(line.text.charAt(pos + 1)) && matching[line.text.charAt(++pos)];
    if (!match) return null;
    var dir = match.charAt(1) == ">" ? 1 : -1;
    if (config && config.strict && (dir > 0) != (pos == where.ch)) return null;
    var style = cm.getTokenTypeAt(Pos(where.line, pos + 1));

    var found = scanForBracket(cm, Pos(where.line, pos + (dir > 0 ? 1 : 0)), dir, style || null, config);
    if (found == null) return null;
    return {from: Pos(where.line, pos), to: found && found.pos,
            match: found && found.ch == match.charAt(0), forward: dir > 0};
  }

  // bracketRegex is used to specify which type of bracket to scan
  // should be a regexp, e.g. /[[\]]/
  //
  // Note: If "where" is on an open bracket, then this bracket is ignored.
  //
  // Returns false when no bracket was found, null when it reached
  // maxScanLines and gave up
  function scanForBracket(cm, where, dir, style, config) {
    var maxScanLen = (config && config.maxScanLineLength) || 10000;
    var maxScanLines = (config && config.maxScanLines) || 1000;

    var stack = [];
    var re = bracketRegex(config)
    var lineEnd = dir > 0 ? Math.min(where.line + maxScanLines, cm.lastLine() + 1)
                          : Math.max(cm.firstLine() - 1, where.line - maxScanLines);
    for (var lineNo = where.line; lineNo != lineEnd; lineNo += dir) {
      var line = cm.getLine(lineNo);
      if (!line) continue;
      var pos = dir > 0 ? 0 : line.length - 1, end = dir > 0 ? line.length : -1;
      if (line.length > maxScanLen) continue;
      if (lineNo == where.line) pos = where.ch - (dir < 0 ? 1 : 0);
      for (; pos != end; pos += dir) {
        var ch = line.charAt(pos);
        if (re.test(ch) && (style === undefined || cm.getTokenTypeAt(Pos(lineNo, pos + 1)) == style)) {
          var match = matching[ch];
          if (match && (match.charAt(1) == ">") == (dir > 0)) stack.push(ch);
          else if (!stack.length) return {pos: Pos(lineNo, pos), ch: ch};
          else stack.pop();
        }
      }
    }
    return lineNo - dir == (dir > 0 ? cm.lastLine() : cm.firstLine()) ? false : null;
  }

  function matchBrackets(cm, autoclear, config) {
    // Disable brace matching in long lines, since it'll cause hugely slow updates
    var maxHighlightLen = cm.state.matchBrackets.maxHighlightLineLength || 1000;
    var marks = [], ranges = cm.listSelections();
    for (var i = 0; i < ranges.length; i++) {
      var match = ranges[i].empty() && findMatchingBracket(cm, ranges[i].head, config);
      if (match && cm.getLine(match.from.line).length <= maxHighlightLen) {
        var style = match.match ? "CodeMirror-matchingbracket" : "CodeMirror-nonmatchingbracket";
        marks.push(cm.markText(match.from, Pos(match.from.line, match.from.ch + 1), {className: style}));
        if (match.to && cm.getLine(match.to.line).length <= maxHighlightLen)
          marks.push(cm.markText(match.to, Pos(match.to.line, match.to.ch + 1), {className: style}));
      }
    }

    if (marks.length) {
      // Kludge to work around the IE bug from issue #1193, where text
      // input stops going to the textare whever this fires.
      if (ie_lt8 && cm.state.focused) cm.focus();

      var clear = function() {
        cm.operation(function() {
          for (var i = 0; i < marks.length; i++) marks[i].clear();
        });
      };
      if (autoclear) setTimeout(clear, 800);
      else return clear;
    }
  }

  function doMatchBrackets(cm) {
    cm.operation(function() {
      if (cm.state.matchBrackets.currentlyHighlighted) {
        cm.state.matchBrackets.currentlyHighlighted();
        cm.state.matchBrackets.currentlyHighlighted = null;
      }
      cm.state.matchBrackets.currentlyHighlighted = matchBrackets(cm, false, cm.state.matchBrackets);
    });
  }

  CodeMirror.defineOption("matchBrackets", false, function(cm, val, old) {
    function clear(cm) {
      if (cm.state.matchBrackets && cm.state.matchBrackets.currentlyHighlighted) {
        cm.state.matchBrackets.currentlyHighlighted();
        cm.state.matchBrackets.currentlyHighlighted = null;
      }
    }

    if (old && old != CodeMirror.Init) {
      cm.off("cursorActivity", doMatchBrackets);
      cm.off("focus", doMatchBrackets)
      cm.off("blur", clear)
      clear(cm);
    }
    if (val) {
      cm.state.matchBrackets = typeof val == "object" ? val : {};
      cm.on("cursorActivity", doMatchBrackets);
      cm.on("focus", doMatchBrackets)
      cm.on("blur", clear)
    }
  });

  CodeMirror.defineExtension("matchBrackets", function() {matchBrackets(this, true);});
  CodeMirror.defineExtension("findMatchingBracket", function(pos, config, oldConfig){
    // Backwards-compatibility kludge
    if (oldConfig || typeof config == "boolean") {
      if (!oldConfig) {
        config = config ? {strict: true} : null
      } else {
        oldConfig.strict = config
        config = oldConfig
      }
    }
    return findMatchingBracket(this, pos, config)
  });
  CodeMirror.defineExtension("scanForBracket", function(pos, dir, style, config){
    return scanForBracket(this, pos, dir, style, config);
  });
});


/***/ }),

/***/ "./node_modules/codemirror/addon/selection/active-line.js":
/*!****************************************************************!*\
  !*** ./node_modules/codemirror/addon/selection/active-line.js ***!
  \****************************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

(function(mod) {
  if (true) // CommonJS
    mod(__webpack_require__(/*! ../../lib/codemirror */ "./node_modules/codemirror/lib/codemirror.js"));
  else {}
})(function(CodeMirror) {
  "use strict";
  var WRAP_CLASS = "CodeMirror-activeline";
  var BACK_CLASS = "CodeMirror-activeline-background";
  var GUTT_CLASS = "CodeMirror-activeline-gutter";

  CodeMirror.defineOption("styleActiveLine", false, function(cm, val, old) {
    var prev = old == CodeMirror.Init ? false : old;
    if (val == prev) return
    if (prev) {
      cm.off("beforeSelectionChange", selectionChange);
      clearActiveLines(cm);
      delete cm.state.activeLines;
    }
    if (val) {
      cm.state.activeLines = [];
      updateActiveLines(cm, cm.listSelections());
      cm.on("beforeSelectionChange", selectionChange);
    }
  });

  function clearActiveLines(cm) {
    for (var i = 0; i < cm.state.activeLines.length; i++) {
      cm.removeLineClass(cm.state.activeLines[i], "wrap", WRAP_CLASS);
      cm.removeLineClass(cm.state.activeLines[i], "background", BACK_CLASS);
      cm.removeLineClass(cm.state.activeLines[i], "gutter", GUTT_CLASS);
    }
  }

  function sameArray(a, b) {
    if (a.length != b.length) return false;
    for (var i = 0; i < a.length; i++)
      if (a[i] != b[i]) return false;
    return true;
  }

  function updateActiveLines(cm, ranges) {
    var active = [];
    for (var i = 0; i < ranges.length; i++) {
      var range = ranges[i];
      var option = cm.getOption("styleActiveLine");
      if (typeof option == "object" && option.nonEmpty ? range.anchor.line != range.head.line : !range.empty())
        continue
      var line = cm.getLineHandleVisualStart(range.head.line);
      if (active[active.length - 1] != line) active.push(line);
    }
    if (sameArray(cm.state.activeLines, active)) return;
    cm.operation(function() {
      clearActiveLines(cm);
      for (var i = 0; i < active.length; i++) {
        cm.addLineClass(active[i], "wrap", WRAP_CLASS);
        cm.addLineClass(active[i], "background", BACK_CLASS);
        cm.addLineClass(active[i], "gutter", GUTT_CLASS);
      }
      cm.state.activeLines = active;
    });
  }

  function selectionChange(cm, sel) {
    updateActiveLines(cm, sel.ranges);
  }
});


/***/ }),

/***/ "./node_modules/codemirror/lib/codemirror.js":
/*!***************************************************!*\
  !*** ./node_modules/codemirror/lib/codemirror.js ***!
  \***************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

// This is CodeMirror (https://codemirror.net), a code editor
// implemented in JavaScript on top of the browser's DOM.
//
// You can find some technical background for some of the code below
// at http://marijnhaverbeke.nl/blog/#cm-internals .

(function (global, factory) {
   true ? module.exports = factory() :
  undefined;
}(this, (function () { 'use strict';

  // Kludges for bugs and behavior differences that can't be feature
  // detected are enabled based on userAgent etc sniffing.
  var userAgent = navigator.userAgent;
  var platform = navigator.platform;

  var gecko = /gecko\/\d/i.test(userAgent);
  var ie_upto10 = /MSIE \d/.test(userAgent);
  var ie_11up = /Trident\/(?:[7-9]|\d{2,})\..*rv:(\d+)/.exec(userAgent);
  var edge = /Edge\/(\d+)/.exec(userAgent);
  var ie = ie_upto10 || ie_11up || edge;
  var ie_version = ie && (ie_upto10 ? document.documentMode || 6 : +(edge || ie_11up)[1]);
  var webkit = !edge && /WebKit\//.test(userAgent);
  var qtwebkit = webkit && /Qt\/\d+\.\d+/.test(userAgent);
  var chrome = !edge && /Chrome\//.test(userAgent);
  var presto = /Opera\//.test(userAgent);
  var safari = /Apple Computer/.test(navigator.vendor);
  var mac_geMountainLion = /Mac OS X 1\d\D([8-9]|\d\d)\D/.test(userAgent);
  var phantom = /PhantomJS/.test(userAgent);

  var ios = !edge && /AppleWebKit/.test(userAgent) && /Mobile\/\w+/.test(userAgent);
  var android = /Android/.test(userAgent);
  // This is woefully incomplete. Suggestions for alternative methods welcome.
  var mobile = ios || android || /webOS|BlackBerry|Opera Mini|Opera Mobi|IEMobile/i.test(userAgent);
  var mac = ios || /Mac/.test(platform);
  var chromeOS = /\bCrOS\b/.test(userAgent);
  var windows = /win/i.test(platform);

  var presto_version = presto && userAgent.match(/Version\/(\d*\.\d*)/);
  if (presto_version) { presto_version = Number(presto_version[1]); }
  if (presto_version && presto_version >= 15) { presto = false; webkit = true; }
  // Some browsers use the wrong event properties to signal cmd/ctrl on OS X
  var flipCtrlCmd = mac && (qtwebkit || presto && (presto_version == null || presto_version < 12.11));
  var captureRightClick = gecko || (ie && ie_version >= 9);

  function classTest(cls) { return new RegExp("(^|\\s)" + cls + "(?:$|\\s)\\s*") }

  var rmClass = function(node, cls) {
    var current = node.className;
    var match = classTest(cls).exec(current);
    if (match) {
      var after = current.slice(match.index + match[0].length);
      node.className = current.slice(0, match.index) + (after ? match[1] + after : "");
    }
  };

  function removeChildren(e) {
    for (var count = e.childNodes.length; count > 0; --count)
      { e.removeChild(e.firstChild); }
    return e
  }

  function removeChildrenAndAdd(parent, e) {
    return removeChildren(parent).appendChild(e)
  }

  function elt(tag, content, className, style) {
    var e = document.createElement(tag);
    if (className) { e.className = className; }
    if (style) { e.style.cssText = style; }
    if (typeof content == "string") { e.appendChild(document.createTextNode(content)); }
    else if (content) { for (var i = 0; i < content.length; ++i) { e.appendChild(content[i]); } }
    return e
  }
  // wrapper for elt, which removes the elt from the accessibility tree
  function eltP(tag, content, className, style) {
    var e = elt(tag, content, className, style);
    e.setAttribute("role", "presentation");
    return e
  }

  var range;
  if (document.createRange) { range = function(node, start, end, endNode) {
    var r = document.createRange();
    r.setEnd(endNode || node, end);
    r.setStart(node, start);
    return r
  }; }
  else { range = function(node, start, end) {
    var r = document.body.createTextRange();
    try { r.moveToElementText(node.parentNode); }
    catch(e) { return r }
    r.collapse(true);
    r.moveEnd("character", end);
    r.moveStart("character", start);
    return r
  }; }

  function contains(parent, child) {
    if (child.nodeType == 3) // Android browser always returns false when child is a textnode
      { child = child.parentNode; }
    if (parent.contains)
      { return parent.contains(child) }
    do {
      if (child.nodeType == 11) { child = child.host; }
      if (child == parent) { return true }
    } while (child = child.parentNode)
  }

  function activeElt() {
    // IE and Edge may throw an "Unspecified Error" when accessing document.activeElement.
    // IE < 10 will throw when accessed while the page is loading or in an iframe.
    // IE > 9 and Edge will throw when accessed in an iframe if document.body is unavailable.
    var activeElement;
    try {
      activeElement = document.activeElement;
    } catch(e) {
      activeElement = document.body || null;
    }
    while (activeElement && activeElement.shadowRoot && activeElement.shadowRoot.activeElement)
      { activeElement = activeElement.shadowRoot.activeElement; }
    return activeElement
  }

  function addClass(node, cls) {
    var current = node.className;
    if (!classTest(cls).test(current)) { node.className += (current ? " " : "") + cls; }
  }
  function joinClasses(a, b) {
    var as = a.split(" ");
    for (var i = 0; i < as.length; i++)
      { if (as[i] && !classTest(as[i]).test(b)) { b += " " + as[i]; } }
    return b
  }

  var selectInput = function(node) { node.select(); };
  if (ios) // Mobile Safari apparently has a bug where select() is broken.
    { selectInput = function(node) { node.selectionStart = 0; node.selectionEnd = node.value.length; }; }
  else if (ie) // Suppress mysterious IE10 errors
    { selectInput = function(node) { try { node.select(); } catch(_e) {} }; }

  function bind(f) {
    var args = Array.prototype.slice.call(arguments, 1);
    return function(){return f.apply(null, args)}
  }

  function copyObj(obj, target, overwrite) {
    if (!target) { target = {}; }
    for (var prop in obj)
      { if (obj.hasOwnProperty(prop) && (overwrite !== false || !target.hasOwnProperty(prop)))
        { target[prop] = obj[prop]; } }
    return target
  }

  // Counts the column offset in a string, taking tabs into account.
  // Used mostly to find indentation.
  function countColumn(string, end, tabSize, startIndex, startValue) {
    if (end == null) {
      end = string.search(/[^\s\u00a0]/);
      if (end == -1) { end = string.length; }
    }
    for (var i = startIndex || 0, n = startValue || 0;;) {
      var nextTab = string.indexOf("\t", i);
      if (nextTab < 0 || nextTab >= end)
        { return n + (end - i) }
      n += nextTab - i;
      n += tabSize - (n % tabSize);
      i = nextTab + 1;
    }
  }

  var Delayed = function() {
    this.id = null;
    this.f = null;
    this.time = 0;
    this.handler = bind(this.onTimeout, this);
  };
  Delayed.prototype.onTimeout = function (self) {
    self.id = 0;
    if (self.time <= +new Date) {
      self.f();
    } else {
      setTimeout(self.handler, self.time - +new Date);
    }
  };
  Delayed.prototype.set = function (ms, f) {
    this.f = f;
    var time = +new Date + ms;
    if (!this.id || time < this.time) {
      clearTimeout(this.id);
      this.id = setTimeout(this.handler, ms);
      this.time = time;
    }
  };

  function indexOf(array, elt) {
    for (var i = 0; i < array.length; ++i)
      { if (array[i] == elt) { return i } }
    return -1
  }

  // Number of pixels added to scroller and sizer to hide scrollbar
  var scrollerGap = 50;

  // Returned or thrown by various protocols to signal 'I'm not
  // handling this'.
  var Pass = {toString: function(){return "CodeMirror.Pass"}};

  // Reused option objects for setSelection & friends
  var sel_dontScroll = {scroll: false}, sel_mouse = {origin: "*mouse"}, sel_move = {origin: "+move"};

  // The inverse of countColumn -- find the offset that corresponds to
  // a particular column.
  function findColumn(string, goal, tabSize) {
    for (var pos = 0, col = 0;;) {
      var nextTab = string.indexOf("\t", pos);
      if (nextTab == -1) { nextTab = string.length; }
      var skipped = nextTab - pos;
      if (nextTab == string.length || col + skipped >= goal)
        { return pos + Math.min(skipped, goal - col) }
      col += nextTab - pos;
      col += tabSize - (col % tabSize);
      pos = nextTab + 1;
      if (col >= goal) { return pos }
    }
  }

  var spaceStrs = [""];
  function spaceStr(n) {
    while (spaceStrs.length <= n)
      { spaceStrs.push(lst(spaceStrs) + " "); }
    return spaceStrs[n]
  }

  function lst(arr) { return arr[arr.length-1] }

  function map(array, f) {
    var out = [];
    for (var i = 0; i < array.length; i++) { out[i] = f(array[i], i); }
    return out
  }

  function insertSorted(array, value, score) {
    var pos = 0, priority = score(value);
    while (pos < array.length && score(array[pos]) <= priority) { pos++; }
    array.splice(pos, 0, value);
  }

  function nothing() {}

  function createObj(base, props) {
    var inst;
    if (Object.create) {
      inst = Object.create(base);
    } else {
      nothing.prototype = base;
      inst = new nothing();
    }
    if (props) { copyObj(props, inst); }
    return inst
  }

  var nonASCIISingleCaseWordChar = /[\u00df\u0587\u0590-\u05f4\u0600-\u06ff\u3040-\u309f\u30a0-\u30ff\u3400-\u4db5\u4e00-\u9fcc\uac00-\ud7af]/;
  function isWordCharBasic(ch) {
    return /\w/.test(ch) || ch > "\x80" &&
      (ch.toUpperCase() != ch.toLowerCase() || nonASCIISingleCaseWordChar.test(ch))
  }
  function isWordChar(ch, helper) {
    if (!helper) { return isWordCharBasic(ch) }
    if (helper.source.indexOf("\\w") > -1 && isWordCharBasic(ch)) { return true }
    return helper.test(ch)
  }

  function isEmpty(obj) {
    for (var n in obj) { if (obj.hasOwnProperty(n) && obj[n]) { return false } }
    return true
  }

  // Extending unicode characters. A series of a non-extending char +
  // any number of extending chars is treated as a single unit as far
  // as editing and measuring is concerned. This is not fully correct,
  // since some scripts/fonts/browsers also treat other configurations
  // of code points as a group.
  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]/;
  function isExtendingChar(ch) { return ch.charCodeAt(0) >= 768 && extendingChars.test(ch) }

  // Returns a number from the range [`0`; `str.length`] unless `pos` is outside that range.
  function skipExtendingChars(str, pos, dir) {
    while ((dir < 0 ? pos > 0 : pos < str.length) && isExtendingChar(str.charAt(pos))) { pos += dir; }
    return pos
  }

  // Returns the value from the range [`from`; `to`] that satisfies
  // `pred` and is closest to `from`. Assumes that at least `to`
  // satisfies `pred`. Supports `from` being greater than `to`.
  function findFirst(pred, from, to) {
    // At any point we are certain `to` satisfies `pred`, don't know
    // whether `from` does.
    var dir = from > to ? -1 : 1;
    for (;;) {
      if (from == to) { return from }
      var midF = (from + to) / 2, mid = dir < 0 ? Math.ceil(midF) : Math.floor(midF);
      if (mid == from) { return pred(mid) ? from : to }
      if (pred(mid)) { to = mid; }
      else { from = mid + dir; }
    }
  }

  // BIDI HELPERS

  function iterateBidiSections(order, from, to, f) {
    if (!order) { return f(from, to, "ltr", 0) }
    var found = false;
    for (var i = 0; i < order.length; ++i) {
      var part = order[i];
      if (part.from < to && part.to > from || from == to && part.to == from) {
        f(Math.max(part.from, from), Math.min(part.to, to), part.level == 1 ? "rtl" : "ltr", i);
        found = true;
      }
    }
    if (!found) { f(from, to, "ltr"); }
  }

  var bidiOther = null;
  function getBidiPartAt(order, ch, sticky) {
    var found;
    bidiOther = null;
    for (var i = 0; i < order.length; ++i) {
      var cur = order[i];
      if (cur.from < ch && cur.to > ch) { return i }
      if (cur.to == ch) {
        if (cur.from != cur.to && sticky == "before") { found = i; }
        else { bidiOther = i; }
      }
      if (cur.from == ch) {
        if (cur.from != cur.to && sticky != "before") { found = i; }
        else { bidiOther = i; }
      }
    }
    return found != null ? found : bidiOther
  }

  // Bidirectional ordering algorithm
  // See http://unicode.org/reports/tr9/tr9-13.html for the algorithm
  // that this (partially) implements.

  // One-char codes used for character types:
  // L (L):   Left-to-Right
  // R (R):   Right-to-Left
  // r (AL):  Right-to-Left Arabic
  // 1 (EN):  European Number
  // + (ES):  European Number Separator
  // % (ET):  European Number Terminator
  // n (AN):  Arabic Number
  // , (CS):  Common Number Separator
  // m (NSM): Non-Spacing Mark
  // b (BN):  Boundary Neutral
  // s (B):   Paragraph Separator
  // t (S):   Segment Separator
  // w (WS):  Whitespace
  // N (ON):  Other Neutrals

  // Returns null if characters are ordered as they appear
  // (left-to-right), or an array of sections ({from, to, level}
  // objects) in the order in which they occur visually.
  var bidiOrdering = (function() {
    // Character types for codepoints 0 to 0xff
    var lowTypes = "bbbbbbbbbtstwsbbbbbbbbbbbbbbssstwNN%%%NNNNNN,N,N1111111111NNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNNNLLLLLLLLLLLLLLLLLLLLLLLLLLNNNNbbbbbbsbbbbbbbbbbbbbbbbbbbbbbbbbb,N%%%%NNNNLNNNNN%%11NLNNN1LNNNNNLLLLLLLLLLLLLLLLLLLLLLLNLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLN";
    // Character types for codepoints 0x600 to 0x6f9
    var arabicTypes = "nnnnnnNNr%%r,rNNmmmmmmmmmmmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmmmmmmmmmmmmmmmnnnnnnnnnn%nnrrrmrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrmmmmmmmnNmmmmmmrrmmNmmmmrr1111111111";
    function charType(code) {
      if (code <= 0xf7) { return lowTypes.charAt(code) }
      else if (0x590 <= code && code <= 0x5f4) { return "R" }
      else if (0x600 <= code && code <= 0x6f9) { return arabicTypes.charAt(code - 0x600) }
      else if (0x6ee <= code && code <= 0x8ac) { return "r" }
      else if (0x2000 <= code && code <= 0x200b) { return "w" }
      else if (code == 0x200c) { return "b" }
      else { return "L" }
    }

    var bidiRE = /[\u0590-\u05f4\u0600-\u06ff\u0700-\u08ac]/;
    var isNeutral = /[stwN]/, isStrong = /[LRr]/, countsAsLeft = /[Lb1n]/, countsAsNum = /[1n]/;

    function BidiSpan(level, from, to) {
      this.level = level;
      this.from = from; this.to = to;
    }

    return function(str, direction) {
      var outerType = direction == "ltr" ? "L" : "R";

      if (str.length == 0 || direction == "ltr" && !bidiRE.test(str)) { return false }
      var len = str.length, types = [];
      for (var i = 0; i < len; ++i)
        { types.push(charType(str.charCodeAt(i))); }

      // W1. Examine each non-spacing mark (NSM) in the level run, and
      // change the type of the NSM to the type of the previous
      // character. If the NSM is at the start of the level run, it will
      // get the type of sor.
      for (var i$1 = 0, prev = outerType; i$1 < len; ++i$1) {
        var type = types[i$1];
        if (type == "m") { types[i$1] = prev; }
        else { prev = type; }
      }

      // W2. Search backwards from each instance of a European number
      // until the first strong type (R, L, AL, or sor) is found. If an
      // AL is found, change the type of the European number to Arabic
      // number.
      // W3. Change all ALs to R.
      for (var i$2 = 0, cur = outerType; i$2 < len; ++i$2) {
        var type$1 = types[i$2];
        if (type$1 == "1" && cur == "r") { types[i$2] = "n"; }
        else if (isStrong.test(type$1)) { cur = type$1; if (type$1 == "r") { types[i$2] = "R"; } }
      }

      // W4. A single European separator between two European numbers
      // changes to a European number. A single common separator between
      // two numbers of the same type changes to that type.
      for (var i$3 = 1, prev$1 = types[0]; i$3 < len - 1; ++i$3) {
        var type$2 = types[i$3];
        if (type$2 == "+" && prev$1 == "1" && types[i$3+1] == "1") { types[i$3] = "1"; }
        else if (type$2 == "," && prev$1 == types[i$3+1] &&
                 (prev$1 == "1" || prev$1 == "n")) { types[i$3] = prev$1; }
        prev$1 = type$2;
      }

      // W5. A sequence of European terminators adjacent to European
      // numbers changes to all European numbers.
      // W6. Otherwise, separators and terminators change to Other
      // Neutral.
      for (var i$4 = 0; i$4 < len; ++i$4) {
        var type$3 = types[i$4];
        if (type$3 == ",") { types[i$4] = "N"; }
        else if (type$3 == "%") {
          var end = (void 0);
          for (end = i$4 + 1; end < len && types[end] == "%"; ++end) {}
          var replace = (i$4 && types[i$4-1] == "!") || (end < len && types[end] == "1") ? "1" : "N";
          for (var j = i$4; j < end; ++j) { types[j] = replace; }
          i$4 = end - 1;
        }
      }

      // W7. Search backwards from each instance of a European number
      // until the first strong type (R, L, or sor) is found. If an L is
      // found, then change the type of the European number to L.
      for (var i$5 = 0, cur$1 = outerType; i$5 < len; ++i$5) {
        var type$4 = types[i$5];
        if (cur$1 == "L" && type$4 == "1") { types[i$5] = "L"; }
        else if (isStrong.test(type$4)) { cur$1 = type$4; }
      }

      // N1. A sequence of neutrals takes the direction of the
      // surrounding strong text if the text on both sides has the same
      // direction. European and Arabic numbers act as if they were R in
      // terms of their influence on neutrals. Start-of-level-run (sor)
      // and end-of-level-run (eor) are used at level run boundaries.
      // N2. Any remaining neutrals take the embedding direction.
      for (var i$6 = 0; i$6 < len; ++i$6) {
        if (isNeutral.test(types[i$6])) {
          var end$1 = (void 0);
          for (end$1 = i$6 + 1; end$1 < len && isNeutral.test(types[end$1]); ++end$1) {}
          var before = (i$6 ? types[i$6-1] : outerType) == "L";
          var after = (end$1 < len ? types[end$1] : outerType) == "L";
          var replace$1 = before == after ? (before ? "L" : "R") : outerType;
          for (var j$1 = i$6; j$1 < end$1; ++j$1) { types[j$1] = replace$1; }
          i$6 = end$1 - 1;
        }
      }

      // Here we depart from the documented algorithm, in order to avoid
      // building up an actual levels array. Since there are only three
      // levels (0, 1, 2) in an implementation that doesn't take
      // explicit embedding into account, we can build up the order on
      // the fly, without following the level-based algorithm.
      var order = [], m;
      for (var i$7 = 0; i$7 < len;) {
        if (countsAsLeft.test(types[i$7])) {
          var start = i$7;
          for (++i$7; i$7 < len && countsAsLeft.test(types[i$7]); ++i$7) {}
          order.push(new BidiSpan(0, start, i$7));
        } else {
          var pos = i$7, at = order.length, isRTL = direction == "rtl" ? 1 : 0;
          for (++i$7; i$7 < len && types[i$7] != "L"; ++i$7) {}
          for (var j$2 = pos; j$2 < i$7;) {
            if (countsAsNum.test(types[j$2])) {
              if (pos < j$2) { order.splice(at, 0, new BidiSpan(1, pos, j$2)); at += isRTL; }
              var nstart = j$2;
              for (++j$2; j$2 < i$7 && countsAsNum.test(types[j$2]); ++j$2) {}
              order.splice(at, 0, new BidiSpan(2, nstart, j$2));
              at += isRTL;
              pos = j$2;
            } else { ++j$2; }
          }
          if (pos < i$7) { order.splice(at, 0, new BidiSpan(1, pos, i$7)); }
        }
      }
      if (direction == "ltr") {
        if (order[0].level == 1 && (m = str.match(/^\s+/))) {
          order[0].from = m[0].length;
          order.unshift(new BidiSpan(0, 0, m[0].length));
        }
        if (lst(order).level == 1 && (m = str.match(/\s+$/))) {
          lst(order).to -= m[0].length;
          order.push(new BidiSpan(0, len - m[0].length, len));
        }
      }

      return direction == "rtl" ? order.reverse() : order
    }
  })();

  // Get the bidi ordering for the given line (and cache it). Returns
  // false for lines that are fully left-to-right, and an array of
  // BidiSpan objects otherwise.
  function getOrder(line, direction) {
    var order = line.order;
    if (order == null) { order = line.order = bidiOrdering(line.text, direction); }
    return order
  }

  // EVENT HANDLING

  // Lightweight event framework. on/off also work on DOM nodes,
  // registering native DOM handlers.

  var noHandlers = [];

  var on = function(emitter, type, f) {
    if (emitter.addEventListener) {
      emitter.addEventListener(type, f, false);
    } else if (emitter.attachEvent) {
      emitter.attachEvent("on" + type, f);
    } else {
      var map = emitter._handlers || (emitter._handlers = {});
      map[type] = (map[type] || noHandlers).concat(f);
    }
  };

  function getHandlers(emitter, type) {
    return emitter._handlers && emitter._handlers[type] || noHandlers
  }

  function off(emitter, type, f) {
    if (emitter.removeEventListener) {
      emitter.removeEventListener(type, f, false);
    } else if (emitter.detachEvent) {
      emitter.detachEvent("on" + type, f);
    } else {
      var map = emitter._handlers, arr = map && map[type];
      if (arr) {
        var index = indexOf(arr, f);
        if (index > -1)
          { map[type] = arr.slice(0, index).concat(arr.slice(index + 1)); }
      }
    }
  }

  function signal(emitter, type /*, values...*/) {
    var handlers = getHandlers(emitter, type);
    if (!handlers.length) { return }
    var args = Array.prototype.slice.call(arguments, 2);
    for (var i = 0; i < handlers.length; ++i) { handlers[i].apply(null, args); }
  }

  // The DOM events that CodeMirror handles can be overridden by
  // registering a (non-DOM) handler on the editor for the event name,
  // and preventDefault-ing the event in that handler.
  function signalDOMEvent(cm, e, override) {
    if (typeof e == "string")
      { e = {type: e, preventDefault: function() { this.defaultPrevented = true; }}; }
    signal(cm, override || e.type, cm, e);
    return e_defaultPrevented(e) || e.codemirrorIgnore
  }

  function signalCursorActivity(cm) {
    var arr = cm._handlers && cm._handlers.cursorActivity;
    if (!arr) { return }
    var set = cm.curOp.cursorActivityHandlers || (cm.curOp.cursorActivityHandlers = []);
    for (var i = 0; i < arr.length; ++i) { if (indexOf(set, arr[i]) == -1)
      { set.push(arr[i]); } }
  }

  function hasHandler(emitter, type) {
    return getHandlers(emitter, type).length > 0
  }

  // Add on and off methods to a constructor's prototype, to make
  // registering events on such objects more convenient.
  function eventMixin(ctor) {
    ctor.prototype.on = function(type, f) {on(this, type, f);};
    ctor.prototype.off = function(type, f) {off(this, type, f);};
  }

  // Due to the fact that we still support jurassic IE versions, some
  // compatibility wrappers are needed.

  function e_preventDefault(e) {
    if (e.preventDefault) { e.preventDefault(); }
    else { e.returnValue = false; }
  }
  function e_stopPropagation(e) {
    if (e.stopPropagation) { e.stopPropagation(); }
    else { e.cancelBubble = true; }
  }
  function e_defaultPrevented(e) {
    return e.defaultPrevented != null ? e.defaultPrevented : e.returnValue == false
  }
  function e_stop(e) {e_preventDefault(e); e_stopPropagation(e);}

  function e_target(e) {return e.target || e.srcElement}
  function e_button(e) {
    var b = e.which;
    if (b == null) {
      if (e.button & 1) { b = 1; }
      else if (e.button & 2) { b = 3; }
      else if (e.button & 4) { b = 2; }
    }
    if (mac && e.ctrlKey && b == 1) { b = 3; }
    return b
  }

  // Detect drag-and-drop
  var dragAndDrop = function() {
    // There is *some* kind of drag-and-drop support in IE6-8, but I
    // couldn't get it to work yet.
    if (ie && ie_version < 9) { return false }
    var div = elt('div');
    return "draggable" in div || "dragDrop" in div
  }();

  var zwspSupported;
  function zeroWidthElement(measure) {
    if (zwspSupported == null) {
      var test = elt("span", "\u200b");
      removeChildrenAndAdd(measure, elt("span", [test, document.createTextNode("x")]));
      if (measure.firstChild.offsetHeight != 0)
        { zwspSupported = test.offsetWidth <= 1 && test.offsetHeight > 2 && !(ie && ie_version < 8); }
    }
    var node = zwspSupported ? elt("span", "\u200b") :
      elt("span", "\u00a0", null, "display: inline-block; width: 1px; margin-right: -1px");
    node.setAttribute("cm-text", "");
    return node
  }

  // Feature-detect IE's crummy client rect reporting for bidi text
  var badBidiRects;
  function hasBadBidiRects(measure) {
    if (badBidiRects != null) { return badBidiRects }
    var txt = removeChildrenAndAdd(measure, document.createTextNode("A\u062eA"));
    var r0 = range(txt, 0, 1).getBoundingClientRect();
    var r1 = range(txt, 1, 2).getBoundingClientRect();
    removeChildren(measure);
    if (!r0 || r0.left == r0.right) { return false } // Safari returns null in some cases (#2780)
    return badBidiRects = (r1.right - r0.right < 3)
  }

  // See if "".split is the broken IE version, if so, provide an
  // alternative way to split lines.
  var splitLinesAuto = "\n\nb".split(/\n/).length != 3 ? function (string) {
    var pos = 0, result = [], l = string.length;
    while (pos <= l) {
      var nl = string.indexOf("\n", pos);
      if (nl == -1) { nl = string.length; }
      var line = string.slice(pos, string.charAt(nl - 1) == "\r" ? nl - 1 : nl);
      var rt = line.indexOf("\r");
      if (rt != -1) {
        result.push(line.slice(0, rt));
        pos += rt + 1;
      } else {
        result.push(line);
        pos = nl + 1;
      }
    }
    return result
  } : function (string) { return string.split(/\r\n?|\n/); };

  var hasSelection = window.getSelection ? function (te) {
    try { return te.selectionStart != te.selectionEnd }
    catch(e) { return false }
  } : function (te) {
    var range;
    try {range = te.ownerDocument.selection.createRange();}
    catch(e) {}
    if (!range || range.parentElement() != te) { return false }
    return range.compareEndPoints("StartToEnd", range) != 0
  };

  var hasCopyEvent = (function () {
    var e = elt("div");
    if ("oncopy" in e) { return true }
    e.setAttribute("oncopy", "return;");
    return typeof e.oncopy == "function"
  })();

  var badZoomedRects = null;
  function hasBadZoomedRects(measure) {
    if (badZoomedRects != null) { return badZoomedRects }
    var node = removeChildrenAndAdd(measure, elt("span", "x"));
    var normal = node.getBoundingClientRect();
    var fromRange = range(node, 0, 1).getBoundingClientRect();
    return badZoomedRects = Math.abs(normal.left - fromRange.left) > 1
  }

  // Known modes, by name and by MIME
  var modes = {}, mimeModes = {};

  // Extra arguments are stored as the mode's dependencies, which is
  // used by (legacy) mechanisms like loadmode.js to automatically
  // load a mode. (Preferred mechanism is the require/define calls.)
  function defineMode(name, mode) {
    if (arguments.length > 2)
      { mode.dependencies = Array.prototype.slice.call(arguments, 2); }
    modes[name] = mode;
  }

  function defineMIME(mime, spec) {
    mimeModes[mime] = spec;
  }

  // Given a MIME type, a {name, ...options} config object, or a name
  // string, return a mode config object.
  function resolveMode(spec) {
    if (typeof spec == "string" && mimeModes.hasOwnProperty(spec)) {
      spec = mimeModes[spec];
    } else if (spec && typeof spec.name == "string" && mimeModes.hasOwnProperty(spec.name)) {
      var found = mimeModes[spec.name];
      if (typeof found == "string") { found = {name: found}; }
      spec = createObj(found, spec);
      spec.name = found.name;
    } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+xml$/.test(spec)) {
      return resolveMode("application/xml")
    } else if (typeof spec == "string" && /^[\w\-]+\/[\w\-]+\+json$/.test(spec)) {
      return resolveMode("application/json")
    }
    if (typeof spec == "string") { return {name: spec} }
    else { return spec || {name: "null"} }
  }

  // Given a mode spec (anything that resolveMode accepts), find and
  // initialize an actual mode object.
  function getMode(options, spec) {
    spec = resolveMode(spec);
    var mfactory = modes[spec.name];
    if (!mfactory) { return getMode(options, "text/plain") }
    var modeObj = mfactory(options, spec);
    if (modeExtensions.hasOwnProperty(spec.name)) {
      var exts = modeExtensions[spec.name];
      for (var prop in exts) {
        if (!exts.hasOwnProperty(prop)) { continue }
        if (modeObj.hasOwnProperty(prop)) { modeObj["_" + prop] = modeObj[prop]; }
        modeObj[prop] = exts[prop];
      }
    }
    modeObj.name = spec.name;
    if (spec.helperType) { modeObj.helperType = spec.helperType; }
    if (spec.modeProps) { for (var prop$1 in spec.modeProps)
      { modeObj[prop$1] = spec.modeProps[prop$1]; } }

    return modeObj
  }

  // This can be used to attach properties to mode objects from
  // outside the actual mode definition.
  var modeExtensions = {};
  function extendMode(mode, properties) {
    var exts = modeExtensions.hasOwnProperty(mode) ? modeExtensions[mode] : (modeExtensions[mode] = {});
    copyObj(properties, exts);
  }

  function copyState(mode, state) {
    if (state === true) { return state }
    if (mode.copyState) { return mode.copyState(state) }
    var nstate = {};
    for (var n in state) {
      var val = state[n];
      if (val instanceof Array) { val = val.concat([]); }
      nstate[n] = val;
    }
    return nstate
  }

  // Given a mode and a state (for that mode), find the inner mode and
  // state at the position that the state refers to.
  function innerMode(mode, state) {
    var info;
    while (mode.innerMode) {
      info = mode.innerMode(state);
      if (!info || info.mode == mode) { break }
      state = info.state;
      mode = info.mode;
    }
    return info || {mode: mode, state: state}
  }

  function startState(mode, a1, a2) {
    return mode.startState ? mode.startState(a1, a2) : true
  }

  // STRING STREAM

  // Fed to the mode parsers, provides helper functions to make
  // parsers more succinct.

  var StringStream = function(string, tabSize, lineOracle) {
    this.pos = this.start = 0;
    this.string = string;
    this.tabSize = tabSize || 8;
    this.lastColumnPos = this.lastColumnValue = 0;
    this.lineStart = 0;
    this.lineOracle = lineOracle;
  };

  StringStream.prototype.eol = function () {return this.pos >= this.string.length};
  StringStream.prototype.sol = function () {return this.pos == this.lineStart};
  StringStream.prototype.peek = function () {return this.string.charAt(this.pos) || undefined};
  StringStream.prototype.next = function () {
    if (this.pos < this.string.length)
      { return this.string.charAt(this.pos++) }
  };
  StringStream.prototype.eat = function (match) {
    var ch = this.string.charAt(this.pos);
    var ok;
    if (typeof match == "string") { ok = ch == match; }
    else { ok = ch && (match.test ? match.test(ch) : match(ch)); }
    if (ok) {++this.pos; return ch}
  };
  StringStream.prototype.eatWhile = function (match) {
    var start = this.pos;
    while (this.eat(match)){}
    return this.pos > start
  };
  StringStream.prototype.eatSpace = function () {
    var start = this.pos;
    while (/[\s\u00a0]/.test(this.string.charAt(this.pos))) { ++this.pos; }
    return this.pos > start
  };
  StringStream.prototype.skipToEnd = function () {this.pos = this.string.length;};
  StringStream.prototype.skipTo = function (ch) {
    var found = this.string.indexOf(ch, this.pos);
    if (found > -1) {this.pos = found; return true}
  };
  StringStream.prototype.backUp = function (n) {this.pos -= n;};
  StringStream.prototype.column = function () {
    if (this.lastColumnPos < this.start) {
      this.lastColumnValue = countColumn(this.string, this.start, this.tabSize, this.lastColumnPos, this.lastColumnValue);
      this.lastColumnPos = this.start;
    }
    return this.lastColumnValue - (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
  };
  StringStream.prototype.indentation = function () {
    return countColumn(this.string, null, this.tabSize) -
      (this.lineStart ? countColumn(this.string, this.lineStart, this.tabSize) : 0)
  };
  StringStream.prototype.match = function (pattern, consume, caseInsensitive) {
    if (typeof pattern == "string") {
      var cased = function (str) { return caseInsensitive ? str.toLowerCase() : str; };
      var substr = this.string.substr(this.pos, pattern.length);
      if (cased(substr) == cased(pattern)) {
        if (consume !== false) { this.pos += pattern.length; }
        return true
      }
    } else {
      var match = this.string.slice(this.pos).match(pattern);
      if (match && match.index > 0) { return null }
      if (match && consume !== false) { this.pos += match[0].length; }
      return match
    }
  };
  StringStream.prototype.current = function (){return this.string.slice(this.start, this.pos)};
  StringStream.prototype.hideFirstChars = function (n, inner) {
    this.lineStart += n;
    try { return inner() }
    finally { this.lineStart -= n; }
  };
  StringStream.prototype.lookAhead = function (n) {
    var oracle = this.lineOracle;
    return oracle && oracle.lookAhead(n)
  };
  StringStream.prototype.baseToken = function () {
    var oracle = this.lineOracle;
    return oracle && oracle.baseToken(this.pos)
  };

  // Find the line object corresponding to the given line number.
  function getLine(doc, n) {
    n -= doc.first;
    if (n < 0 || n >= doc.size) { throw new Error("There is no line " + (n + doc.first) + " in the document.") }
    var chunk = doc;
    while (!chunk.lines) {
      for (var i = 0;; ++i) {
        var child = chunk.children[i], sz = child.chunkSize();
        if (n < sz) { chunk = child; break }
        n -= sz;
      }
    }
    return chunk.lines[n]
  }

  // Get the part of a document between two positions, as an array of
  // strings.
  function getBetween(doc, start, end) {
    var out = [], n = start.line;
    doc.iter(start.line, end.line + 1, function (line) {
      var text = line.text;
      if (n == end.line) { text = text.slice(0, end.ch); }
      if (n == start.line) { text = text.slice(start.ch); }
      out.push(text);
      ++n;
    });
    return out
  }
  // Get the lines between from and to, as array of strings.
  function getLines(doc, from, to) {
    var out = [];
    doc.iter(from, to, function (line) { out.push(line.text); }); // iter aborts when callback returns truthy value
    return out
  }

  // Update the height of a line, propagating the height change
  // upwards to parent nodes.
  function updateLineHeight(line, height) {
    var diff = height - line.height;
    if (diff) { for (var n = line; n; n = n.parent) { n.height += diff; } }
  }

  // Given a line object, find its line number by walking up through
  // its parent links.
  function lineNo(line) {
    if (line.parent == null) { return null }
    var cur = line.parent, no = indexOf(cur.lines, line);
    for (var chunk = cur.parent; chunk; cur = chunk, chunk = chunk.parent) {
      for (var i = 0;; ++i) {
        if (chunk.children[i] == cur) { break }
        no += chunk.children[i].chunkSize();
      }
    }
    return no + cur.first
  }

  // Find the line at the given vertical position, using the height
  // information in the document tree.
  function lineAtHeight(chunk, h) {
    var n = chunk.first;
    outer: do {
      for (var i$1 = 0; i$1 < chunk.children.length; ++i$1) {
        var child = chunk.children[i$1], ch = child.height;
        if (h < ch) { chunk = child; continue outer }
        h -= ch;
        n += child.chunkSize();
      }
      return n
    } while (!chunk.lines)
    var i = 0;
    for (; i < chunk.lines.length; ++i) {
      var line = chunk.lines[i], lh = line.height;
      if (h < lh) { break }
      h -= lh;
    }
    return n + i
  }

  function isLine(doc, l) {return l >= doc.first && l < doc.first + doc.size}

  function lineNumberFor(options, i) {
    return String(options.lineNumberFormatter(i + options.firstLineNumber))
  }

  // A Pos instance represents a position within the text.
  function Pos(line, ch, sticky) {
    if ( sticky === void 0 ) sticky = null;

    if (!(this instanceof Pos)) { return new Pos(line, ch, sticky) }
    this.line = line;
    this.ch = ch;
    this.sticky = sticky;
  }

  // Compare two positions, return 0 if they are the same, a negative
  // number when a is less, and a positive number otherwise.
  function cmp(a, b) { return a.line - b.line || a.ch - b.ch }

  function equalCursorPos(a, b) { return a.sticky == b.sticky && cmp(a, b) == 0 }

  function copyPos(x) {return Pos(x.line, x.ch)}
  function maxPos(a, b) { return cmp(a, b) < 0 ? b : a }
  function minPos(a, b) { return cmp(a, b) < 0 ? a : b }

  // Most of the external API clips given positions to make sure they
  // actually exist within the document.
  function clipLine(doc, n) {return Math.max(doc.first, Math.min(n, doc.first + doc.size - 1))}
  function clipPos(doc, pos) {
    if (pos.line < doc.first) { return Pos(doc.first, 0) }
    var last = doc.first + doc.size - 1;
    if (pos.line > last) { return Pos(last, getLine(doc, last).text.length) }
    return clipToLen(pos, getLine(doc, pos.line).text.length)
  }
  function clipToLen(pos, linelen) {
    var ch = pos.ch;
    if (ch == null || ch > linelen) { return Pos(pos.line, linelen) }
    else if (ch < 0) { return Pos(pos.line, 0) }
    else { return pos }
  }
  function clipPosArray(doc, array) {
    var out = [];
    for (var i = 0; i < array.length; i++) { out[i] = clipPos(doc, array[i]); }
    return out
  }

  var SavedContext = function(state, lookAhead) {
    this.state = state;
    this.lookAhead = lookAhead;
  };

  var Context = function(doc, state, line, lookAhead) {
    this.state = state;
    this.doc = doc;
    this.line = line;
    this.maxLookAhead = lookAhead || 0;
    this.baseTokens = null;
    this.baseTokenPos = 1;
  };

  Context.prototype.lookAhead = function (n) {
    var line = this.doc.getLine(this.line + n);
    if (line != null && n > this.maxLookAhead) { this.maxLookAhead = n; }
    return line
  };

  Context.prototype.baseToken = function (n) {
    if (!this.baseTokens) { return null }
    while (this.baseTokens[this.baseTokenPos] <= n)
      { this.baseTokenPos += 2; }
    var type = this.baseTokens[this.baseTokenPos + 1];
    return {type: type && type.replace(/( |^)overlay .*/, ""),
            size: this.baseTokens[this.baseTokenPos] - n}
  };

  Context.prototype.nextLine = function () {
    this.line++;
    if (this.maxLookAhead > 0) { this.maxLookAhead--; }
  };

  Context.fromSaved = function (doc, saved, line) {
    if (saved instanceof SavedContext)
      { return new Context(doc, copyState(doc.mode, saved.state), line, saved.lookAhead) }
    else
      { return new Context(doc, copyState(doc.mode, saved), line) }
  };

  Context.prototype.save = function (copy) {
    var state = copy !== false ? copyState(this.doc.mode, this.state) : this.state;
    return this.maxLookAhead > 0 ? new SavedContext(state, this.maxLookAhead) : state
  };


  // Compute a style array (an array starting with a mode generation
  // -- for invalidation -- followed by pairs of end positions and
  // style strings), which is used to highlight the tokens on the
  // line.
  function highlightLine(cm, line, context, forceToEnd) {
    // A styles array always starts with a number identifying the
    // mode/overlays that it is based on (for easy invalidation).
    var st = [cm.state.modeGen], lineClasses = {};
    // Compute the base array of styles
    runMode(cm, line.text, cm.doc.mode, context, function (end, style) { return st.push(end, style); },
            lineClasses, forceToEnd);
    var state = context.state;

    // Run overlays, adjust style array.
    var loop = function ( o ) {
      context.baseTokens = st;
      var overlay = cm.state.overlays[o], i = 1, at = 0;
      context.state = true;
      runMode(cm, line.text, overlay.mode, context, function (end, style) {
        var start = i;
        // Ensure there's a token end at the current position, and that i points at it
        while (at < end) {
          var i_end = st[i];
          if (i_end > end)
            { st.splice(i, 1, end, st[i+1], i_end); }
          i += 2;
          at = Math.min(end, i_end);
        }
        if (!style) { return }
        if (overlay.opaque) {
          st.splice(start, i - start, end, "overlay " + style);
          i = start + 2;
        } else {
          for (; start < i; start += 2) {
            var cur = st[start+1];
            st[start+1] = (cur ? cur + " " : "") + "overlay " + style;
          }
        }
      }, lineClasses);
      context.state = state;
      context.baseTokens = null;
      context.baseTokenPos = 1;
    };

    for (var o = 0; o < cm.state.overlays.length; ++o) loop( o );

    return {styles: st, classes: lineClasses.bgClass || lineClasses.textClass ? lineClasses : null}
  }

  function getLineStyles(cm, line, updateFrontier) {
    if (!line.styles || line.styles[0] != cm.state.modeGen) {
      var context = getContextBefore(cm, lineNo(line));
      var resetState = line.text.length > cm.options.maxHighlightLength && copyState(cm.doc.mode, context.state);
      var result = highlightLine(cm, line, context);
      if (resetState) { context.state = resetState; }
      line.stateAfter = context.save(!resetState);
      line.styles = result.styles;
      if (result.classes) { line.styleClasses = result.classes; }
      else if (line.styleClasses) { line.styleClasses = null; }
      if (updateFrontier === cm.doc.highlightFrontier)
        { cm.doc.modeFrontier = Math.max(cm.doc.modeFrontier, ++cm.doc.highlightFrontier); }
    }
    return line.styles
  }

  function getContextBefore(cm, n, precise) {
    var doc = cm.doc, display = cm.display;
    if (!doc.mode.startState) { return new Context(doc, true, n) }
    var start = findStartLine(cm, n, precise);
    var saved = start > doc.first && getLine(doc, start - 1).stateAfter;
    var context = saved ? Context.fromSaved(doc, saved, start) : new Context(doc, startState(doc.mode), start);

    doc.iter(start, n, function (line) {
      processLine(cm, line.text, context);
      var pos = context.line;
      line.stateAfter = pos == n - 1 || pos % 5 == 0 || pos >= display.viewFrom && pos < display.viewTo ? context.save() : null;
      context.nextLine();
    });
    if (precise) { doc.modeFrontier = context.line; }
    return context
  }

  // Lightweight form of highlight -- proceed over this line and
  // update state, but don't save a style array. Used for lines that
  // aren't currently visible.
  function processLine(cm, text, context, startAt) {
    var mode = cm.doc.mode;
    var stream = new StringStream(text, cm.options.tabSize, context);
    stream.start = stream.pos = startAt || 0;
    if (text == "") { callBlankLine(mode, context.state); }
    while (!stream.eol()) {
      readToken(mode, stream, context.state);
      stream.start = stream.pos;
    }
  }

  function callBlankLine(mode, state) {
    if (mode.blankLine) { return mode.blankLine(state) }
    if (!mode.innerMode) { return }
    var inner = innerMode(mode, state);
    if (inner.mode.blankLine) { return inner.mode.blankLine(inner.state) }
  }

  function readToken(mode, stream, state, inner) {
    for (var i = 0; i < 10; i++) {
      if (inner) { inner[0] = innerMode(mode, state).mode; }
      var style = mode.token(stream, state);
      if (stream.pos > stream.start) { return style }
    }
    throw new Error("Mode " + mode.name + " failed to advance stream.")
  }

  var Token = function(stream, type, state) {
    this.start = stream.start; this.end = stream.pos;
    this.string = stream.current();
    this.type = type || null;
    this.state = state;
  };

  // Utility for getTokenAt and getLineTokens
  function takeToken(cm, pos, precise, asArray) {
    var doc = cm.doc, mode = doc.mode, style;
    pos = clipPos(doc, pos);
    var line = getLine(doc, pos.line), context = getContextBefore(cm, pos.line, precise);
    var stream = new StringStream(line.text, cm.options.tabSize, context), tokens;
    if (asArray) { tokens = []; }
    while ((asArray || stream.pos < pos.ch) && !stream.eol()) {
      stream.start = stream.pos;
      style = readToken(mode, stream, context.state);
      if (asArray) { tokens.push(new Token(stream, style, copyState(doc.mode, context.state))); }
    }
    return asArray ? tokens : new Token(stream, style, context.state)
  }

  function extractLineClasses(type, output) {
    if (type) { for (;;) {
      var lineClass = type.match(/(?:^|\s+)line-(background-)?(\S+)/);
      if (!lineClass) { break }
      type = type.slice(0, lineClass.index) + type.slice(lineClass.index + lineClass[0].length);
      var prop = lineClass[1] ? "bgClass" : "textClass";
      if (output[prop] == null)
        { output[prop] = lineClass[2]; }
      else if (!(new RegExp("(?:^|\\s)" + lineClass[2] + "(?:$|\\s)")).test(output[prop]))
        { output[prop] += " " + lineClass[2]; }
    } }
    return type
  }

  // Run the given mode's parser over a line, calling f for each token.
  function runMode(cm, text, mode, context, f, lineClasses, forceToEnd) {
    var flattenSpans = mode.flattenSpans;
    if (flattenSpans == null) { flattenSpans = cm.options.flattenSpans; }
    var curStart = 0, curStyle = null;
    var stream = new StringStream(text, cm.options.tabSize, context), style;
    var inner = cm.options.addModeClass && [null];
    if (text == "") { extractLineClasses(callBlankLine(mode, context.state), lineClasses); }
    while (!stream.eol()) {
      if (stream.pos > cm.options.maxHighlightLength) {
        flattenSpans = false;
        if (forceToEnd) { processLine(cm, text, context, stream.pos); }
        stream.pos = text.length;
        style = null;
      } else {
        style = extractLineClasses(readToken(mode, stream, context.state, inner), lineClasses);
      }
      if (inner) {
        var mName = inner[0].name;
        if (mName) { style = "m-" + (style ? mName + " " + style : mName); }
      }
      if (!flattenSpans || curStyle != style) {
        while (curStart < stream.start) {
          curStart = Math.min(stream.start, curStart + 5000);
          f(curStart, curStyle);
        }
        curStyle = style;
      }
      stream.start = stream.pos;
    }
    while (curStart < stream.pos) {
      // Webkit seems to refuse to render text nodes longer than 57444
      // characters, and returns inaccurate measurements in nodes
      // starting around 5000 chars.
      var pos = Math.min(stream.pos, curStart + 5000);
      f(pos, curStyle);
      curStart = pos;
    }
  }

  // Finds the line to start with when starting a parse. Tries to
  // find a line with a stateAfter, so that it can start with a
  // valid state. If that fails, it returns the line with the
  // smallest indentation, which tends to need the least context to
  // parse correctly.
  function findStartLine(cm, n, precise) {
    var minindent, minline, doc = cm.doc;
    var lim = precise ? -1 : n - (cm.doc.mode.innerMode ? 1000 : 100);
    for (var search = n; search > lim; --search) {
      if (search <= doc.first) { return doc.first }
      var line = getLine(doc, search - 1), after = line.stateAfter;
      if (after && (!precise || search + (after instanceof SavedContext ? after.lookAhead : 0) <= doc.modeFrontier))
        { return search }
      var indented = countColumn(line.text, null, cm.options.tabSize);
      if (minline == null || minindent > indented) {
        minline = search - 1;
        minindent = indented;
      }
    }
    return minline
  }

  function retreatFrontier(doc, n) {
    doc.modeFrontier = Math.min(doc.modeFrontier, n);
    if (doc.highlightFrontier < n - 10) { return }
    var start = doc.first;
    for (var line = n - 1; line > start; line--) {
      var saved = getLine(doc, line).stateAfter;
      // change is on 3
      // state on line 1 looked ahead 2 -- so saw 3
      // test 1 + 2 < 3 should cover this
      if (saved && (!(saved instanceof SavedContext) || line + saved.lookAhead < n)) {
        start = line + 1;
        break
      }
    }
    doc.highlightFrontier = Math.min(doc.highlightFrontier, start);
  }

  // Optimize some code when these features are not used.
  var sawReadOnlySpans = false, sawCollapsedSpans = false;

  function seeReadOnlySpans() {
    sawReadOnlySpans = true;
  }

  function seeCollapsedSpans() {
    sawCollapsedSpans = true;
  }

  // TEXTMARKER SPANS

  function MarkedSpan(marker, from, to) {
    this.marker = marker;
    this.from = from; this.to = to;
  }

  // Search an array of spans for a span matching the given marker.
  function getMarkedSpanFor(spans, marker) {
    if (spans) { for (var i = 0; i < spans.length; ++i) {
      var span = spans[i];
      if (span.marker == marker) { return span }
    } }
  }
  // Remove a span from an array, returning undefined if no spans are
  // left (we don't store arrays for lines without spans).
  function removeMarkedSpan(spans, span) {
    var r;
    for (var i = 0; i < spans.length; ++i)
      { if (spans[i] != span) { (r || (r = [])).push(spans[i]); } }
    return r
  }
  // Add a span to a line.
  function addMarkedSpan(line, span) {
    line.markedSpans = line.markedSpans ? line.markedSpans.concat([span]) : [span];
    span.marker.attachLine(line);
  }

  // Used for the algorithm that adjusts markers for a change in the
  // document. These functions cut an array of spans at a given
  // character position, returning an array of remaining chunks (or
  // undefined if nothing remains).
  function markedSpansBefore(old, startCh, isInsert) {
    var nw;
    if (old) { for (var i = 0; i < old.length; ++i) {
      var span = old[i], marker = span.marker;
      var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= startCh : span.from < startCh);
      if (startsBefore || span.from == startCh && marker.type == "bookmark" && (!isInsert || !span.marker.insertLeft)) {
        var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= startCh : span.to > startCh)
        ;(nw || (nw = [])).push(new MarkedSpan(marker, span.from, endsAfter ? null : span.to));
      }
    } }
    return nw
  }
  function markedSpansAfter(old, endCh, isInsert) {
    var nw;
    if (old) { for (var i = 0; i < old.length; ++i) {
      var span = old[i], marker = span.marker;
      var endsAfter = span.to == null || (marker.inclusiveRight ? span.to >= endCh : span.to > endCh);
      if (endsAfter || span.from == endCh && marker.type == "bookmark" && (!isInsert || span.marker.insertLeft)) {
        var startsBefore = span.from == null || (marker.inclusiveLeft ? span.from <= endCh : span.from < endCh)
        ;(nw || (nw = [])).push(new MarkedSpan(marker, startsBefore ? null : span.from - endCh,
                                              span.to == null ? null : span.to - endCh));
      }
    } }
    return nw
  }

  // Given a change object, compute the new set of marker spans that
  // cover the line in which the change took place. Removes spans
  // entirely within the change, reconnects spans belonging to the
  // same marker that appear on both sides of the change, and cuts off
  // spans partially within the change. Returns an array of span
  // arrays with one element for each line in (after) the change.
  function stretchSpansOverChange(doc, change) {
    if (change.full) { return null }
    var oldFirst = isLine(doc, change.from.line) && getLine(doc, change.from.line).markedSpans;
    var oldLast = isLine(doc, change.to.line) && getLine(doc, change.to.line).markedSpans;
    if (!oldFirst && !oldLast) { return null }

    var startCh = change.from.ch, endCh = change.to.ch, isInsert = cmp(change.from, change.to) == 0;
    // Get the spans that 'stick out' on both sides
    var first = markedSpansBefore(oldFirst, startCh, isInsert);
    var last = markedSpansAfter(oldLast, endCh, isInsert);

    // Next, merge those two ends
    var sameLine = change.text.length == 1, offset = lst(change.text).length + (sameLine ? startCh : 0);
    if (first) {
      // Fix up .to properties of first
      for (var i = 0; i < first.length; ++i) {
        var span = first[i];
        if (span.to == null) {
          var found = getMarkedSpanFor(last, span.marker);
          if (!found) { span.to = startCh; }
          else if (sameLine) { span.to = found.to == null ? null : found.to + offset; }
        }
      }
    }
    if (last) {
      // Fix up .from in last (or move them into first in case of sameLine)
      for (var i$1 = 0; i$1 < last.length; ++i$1) {
        var span$1 = last[i$1];
        if (span$1.to != null) { span$1.to += offset; }
        if (span$1.from == null) {
          var found$1 = getMarkedSpanFor(first, span$1.marker);
          if (!found$1) {
            span$1.from = offset;
            if (sameLine) { (first || (first = [])).push(span$1); }
          }
        } else {
          span$1.from += offset;
          if (sameLine) { (first || (first = [])).push(span$1); }
        }
      }
    }
    // Make sure we didn't create any zero-length spans
    if (first) { first = clearEmptySpans(first); }
    if (last && last != first) { last = clearEmptySpans(last); }

    var newMarkers = [first];
    if (!sameLine) {
      // Fill gap with whole-line-spans
      var gap = change.text.length - 2, gapMarkers;
      if (gap > 0 && first)
        { for (var i$2 = 0; i$2 < first.length; ++i$2)
          { if (first[i$2].to == null)
            { (gapMarkers || (gapMarkers = [])).push(new MarkedSpan(first[i$2].marker, null, null)); } } }
      for (var i$3 = 0; i$3 < gap; ++i$3)
        { newMarkers.push(gapMarkers); }
      newMarkers.push(last);
    }
    return newMarkers
  }

  // Remove spans that are empty and don't have a clearWhenEmpty
  // option of false.
  function clearEmptySpans(spans) {
    for (var i = 0; i < spans.length; ++i) {
      var span = spans[i];
      if (span.from != null && span.from == span.to && span.marker.clearWhenEmpty !== false)
        { spans.splice(i--, 1); }
    }
    if (!spans.length) { return null }
    return spans
  }

  // Used to 'clip' out readOnly ranges when making a change.
  function removeReadOnlyRanges(doc, from, to) {
    var markers = null;
    doc.iter(from.line, to.line + 1, function (line) {
      if (line.markedSpans) { for (var i = 0; i < line.markedSpans.length; ++i) {
        var mark = line.markedSpans[i].marker;
        if (mark.readOnly && (!markers || indexOf(markers, mark) == -1))
          { (markers || (markers = [])).push(mark); }
      } }
    });
    if (!markers) { return null }
    var parts = [{from: from, to: to}];
    for (var i = 0; i < markers.length; ++i) {
      var mk = markers[i], m = mk.find(0);
      for (var j = 0; j < parts.length; ++j) {
        var p = parts[j];
        if (cmp(p.to, m.from) < 0 || cmp(p.from, m.to) > 0) { continue }
        var newParts = [j, 1], dfrom = cmp(p.from, m.from), dto = cmp(p.to, m.to);
        if (dfrom < 0 || !mk.inclusiveLeft && !dfrom)
          { newParts.push({from: p.from, to: m.from}); }
        if (dto > 0 || !mk.inclusiveRight && !dto)
          { newParts.push({from: m.to, to: p.to}); }
        parts.splice.apply(parts, newParts);
        j += newParts.length - 3;
      }
    }
    return parts
  }

  // Connect or disconnect spans from a line.
  function detachMarkedSpans(line) {
    var spans = line.markedSpans;
    if (!spans) { return }
    for (var i = 0; i < spans.length; ++i)
      { spans[i].marker.detachLine(line); }
    line.markedSpans = null;
  }
  function attachMarkedSpans(line, spans) {
    if (!spans) { return }
    for (var i = 0; i < spans.length; ++i)
      { spans[i].marker.attachLine(line); }
    line.markedSpans = spans;
  }

  // Helpers used when computing which overlapping collapsed span
  // counts as the larger one.
  function extraLeft(marker) { return marker.inclusiveLeft ? -1 : 0 }
  function extraRight(marker) { return marker.inclusiveRight ? 1 : 0 }

  // Returns a number indicating which of two overlapping collapsed
  // spans is larger (and thus includes the other). Falls back to
  // comparing ids when the spans cover exactly the same range.
  function compareCollapsedMarkers(a, b) {
    var lenDiff = a.lines.length - b.lines.length;
    if (lenDiff != 0) { return lenDiff }
    var aPos = a.find(), bPos = b.find();
    var fromCmp = cmp(aPos.from, bPos.from) || extraLeft(a) - extraLeft(b);
    if (fromCmp) { return -fromCmp }
    var toCmp = cmp(aPos.to, bPos.to) || extraRight(a) - extraRight(b);
    if (toCmp) { return toCmp }
    return b.id - a.id
  }

  // Find out whether a line ends or starts in a collapsed span. If
  // so, return the marker for that span.
  function collapsedSpanAtSide(line, start) {
    var sps = sawCollapsedSpans && line.markedSpans, found;
    if (sps) { for (var sp = (void 0), i = 0; i < sps.length; ++i) {
      sp = sps[i];
      if (sp.marker.collapsed && (start ? sp.from : sp.to) == null &&
          (!found || compareCollapsedMarkers(found, sp.marker) < 0))
        { found = sp.marker; }
    } }
    return found
  }
  function collapsedSpanAtStart(line) { return collapsedSpanAtSide(line, true) }
  function collapsedSpanAtEnd(line) { return collapsedSpanAtSide(line, false) }

  function collapsedSpanAround(line, ch) {
    var sps = sawCollapsedSpans && line.markedSpans, found;
    if (sps) { for (var i = 0; i < sps.length; ++i) {
      var sp = sps[i];
      if (sp.marker.collapsed && (sp.from == null || sp.from < ch) && (sp.to == null || sp.to > ch) &&
          (!found || compareCollapsedMarkers(found, sp.marker) < 0)) { found = sp.marker; }
    } }
    return found
  }

  // Test whether there exists a collapsed span that partially
  // overlaps (covers the start or end, but not both) of a new span.
  // Such overlap is not allowed.
  function conflictingCollapsedRange(doc, lineNo, from, to, marker) {
    var line = getLine(doc, lineNo);
    var sps = sawCollapsedSpans && line.markedSpans;
    if (sps) { for (var i = 0; i < sps.length; ++i) {
      var sp = sps[i];
      if (!sp.marker.collapsed) { continue }
      var found = sp.marker.find(0);
      var fromCmp = cmp(found.from, from) || extraLeft(sp.marker) - extraLeft(marker);
      var toCmp = cmp(found.to, to) || extraRight(sp.marker) - extraRight(marker);
      if (fromCmp >= 0 && toCmp <= 0 || fromCmp <= 0 && toCmp >= 0) { continue }
      if (fromCmp <= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.to, from) >= 0 : cmp(found.to, from) > 0) ||
          fromCmp >= 0 && (sp.marker.inclusiveRight && marker.inclusiveLeft ? cmp(found.from, to) <= 0 : cmp(found.from, to) < 0))
        { return true }
    } }
  }

  // A visual line is a line as drawn on the screen. Folding, for
  // example, can cause multiple logical lines to appear on the same
  // visual line. This finds the start of the visual line that the
  // given line is part of (usually that is the line itself).
  function visualLine(line) {
    var merged;
    while (merged = collapsedSpanAtStart(line))
      { line = merged.find(-1, true).line; }
    return line
  }

  function visualLineEnd(line) {
    var merged;
    while (merged = collapsedSpanAtEnd(line))
      { line = merged.find(1, true).line; }
    return line
  }

  // Returns an array of logical lines that continue the visual line
  // started by the argument, or undefined if there are no such lines.
  function visualLineContinued(line) {
    var merged, lines;
    while (merged = collapsedSpanAtEnd(line)) {
      line = merged.find(1, true).line
      ;(lines || (lines = [])).push(line);
    }
    return lines
  }

  // Get the line number of the start of the visual line that the
  // given line number is part of.
  function visualLineNo(doc, lineN) {
    var line = getLine(doc, lineN), vis = visualLine(line);
    if (line == vis) { return lineN }
    return lineNo(vis)
  }

  // Get the line number of the start of the next visual line after
  // the given line.
  function visualLineEndNo(doc, lineN) {
    if (lineN > doc.lastLine()) { return lineN }
    var line = getLine(doc, lineN), merged;
    if (!lineIsHidden(doc, line)) { return lineN }
    while (merged = collapsedSpanAtEnd(line))
      { line = merged.find(1, true).line; }
    return lineNo(line) + 1
  }

  // Compute whether a line is hidden. Lines count as hidden when they
  // are part of a visual line that starts with another line, or when
  // they are entirely covered by collapsed, non-widget span.
  function lineIsHidden(doc, line) {
    var sps = sawCollapsedSpans && line.markedSpans;
    if (sps) { for (var sp = (void 0), i = 0; i < sps.length; ++i) {
      sp = sps[i];
      if (!sp.marker.collapsed) { continue }
      if (sp.from == null) { return true }
      if (sp.marker.widgetNode) { continue }
      if (sp.from == 0 && sp.marker.inclusiveLeft && lineIsHiddenInner(doc, line, sp))
        { return true }
    } }
  }
  function lineIsHiddenInner(doc, line, span) {
    if (span.to == null) {
      var end = span.marker.find(1, true);
      return lineIsHiddenInner(doc, end.line, getMarkedSpanFor(end.line.markedSpans, span.marker))
    }
    if (span.marker.inclusiveRight && span.to == line.text.length)
      { return true }
    for (var sp = (void 0), i = 0; i < line.markedSpans.length; ++i) {
      sp = line.markedSpans[i];
      if (sp.marker.collapsed && !sp.marker.widgetNode && sp.from == span.to &&
          (sp.to == null || sp.to != span.from) &&
          (sp.marker.inclusiveLeft || span.marker.inclusiveRight) &&
          lineIsHiddenInner(doc, line, sp)) { return true }
    }
  }

  // Find the height above the given line.
  function heightAtLine(lineObj) {
    lineObj = visualLine(lineObj);

    var h = 0, chunk = lineObj.parent;
    for (var i = 0; i < chunk.lines.length; ++i) {
      var line = chunk.lines[i];
      if (line == lineObj) { break }
      else { h += line.height; }
    }
    for (var p = chunk.parent; p; chunk = p, p = chunk.parent) {
      for (var i$1 = 0; i$1 < p.children.length; ++i$1) {
        var cur = p.children[i$1];
        if (cur == chunk) { break }
        else { h += cur.height; }
      }
    }
    return h
  }

  // Compute the character length of a line, taking into account
  // collapsed ranges (see markText) that might hide parts, and join
  // other lines onto it.
  function lineLength(line) {
    if (line.height == 0) { return 0 }
    var len = line.text.length, merged, cur = line;
    while (merged = collapsedSpanAtStart(cur)) {
      var found = merged.find(0, true);
      cur = found.from.line;
      len += found.from.ch - found.to.ch;
    }
    cur = line;
    while (merged = collapsedSpanAtEnd(cur)) {
      var found$1 = merged.find(0, true);
      len -= cur.text.length - found$1.from.ch;
      cur = found$1.to.line;
      len += cur.text.length - found$1.to.ch;
    }
    return len
  }

  // Find the longest line in the document.
  function findMaxLine(cm) {
    var d = cm.display, doc = cm.doc;
    d.maxLine = getLine(doc, doc.first);
    d.maxLineLength = lineLength(d.maxLine);
    d.maxLineChanged = true;
    doc.iter(function (line) {
      var len = lineLength(line);
      if (len > d.maxLineLength) {
        d.maxLineLength = len;
        d.maxLine = line;
      }
    });
  }

  // LINE DATA STRUCTURE

  // Line objects. These hold state related to a line, including
  // highlighting info (the styles array).
  var Line = function(text, markedSpans, estimateHeight) {
    this.text = text;
    attachMarkedSpans(this, markedSpans);
    this.height = estimateHeight ? estimateHeight(this) : 1;
  };

  Line.prototype.lineNo = function () { return lineNo(this) };
  eventMixin(Line);

  // Change the content (text, markers) of a line. Automatically
  // invalidates cached information and tries to re-estimate the
  // line's height.
  function updateLine(line, text, markedSpans, estimateHeight) {
    line.text = text;
    if (line.stateAfter) { line.stateAfter = null; }
    if (line.styles) { line.styles = null; }
    if (line.order != null) { line.order = null; }
    detachMarkedSpans(line);
    attachMarkedSpans(line, markedSpans);
    var estHeight = estimateHeight ? estimateHeight(line) : 1;
    if (estHeight != line.height) { updateLineHeight(line, estHeight); }
  }

  // Detach a line from the document tree and its markers.
  function cleanUpLine(line) {
    line.parent = null;
    detachMarkedSpans(line);
  }

  // Convert a style as returned by a mode (either null, or a string
  // containing one or more styles) to a CSS style. This is cached,
  // and also looks for line-wide styles.
  var styleToClassCache = {}, styleToClassCacheWithMode = {};
  function interpretTokenStyle(style, options) {
    if (!style || /^\s*$/.test(style)) { return null }
    var cache = options.addModeClass ? styleToClassCacheWithMode : styleToClassCache;
    return cache[style] ||
      (cache[style] = style.replace(/\S+/g, "cm-$&"))
  }

  // Render the DOM representation of the text of a line. Also builds
  // up a 'line map', which points at the DOM nodes that represent
  // specific stretches of text, and is used by the measuring code.
  // The returned object contains the DOM node, this map, and
  // information about line-wide styles that were set by the mode.
  function buildLineContent(cm, lineView) {
    // The padding-right forces the element to have a 'border', which
    // is needed on Webkit to be able to get line-level bounding
    // rectangles for it (in measureChar).
    var content = eltP("span", null, null, webkit ? "padding-right: .1px" : null);
    var builder = {pre: eltP("pre", [content], "CodeMirror-line"), content: content,
                   col: 0, pos: 0, cm: cm,
                   trailingSpace: false,
                   splitSpaces: cm.getOption("lineWrapping")};
    lineView.measure = {};

    // Iterate over the logical lines that make up this visual line.
    for (var i = 0; i <= (lineView.rest ? lineView.rest.length : 0); i++) {
      var line = i ? lineView.rest[i - 1] : lineView.line, order = (void 0);
      builder.pos = 0;
      builder.addToken = buildToken;
      // Optionally wire in some hacks into the token-rendering
      // algorithm, to deal with browser quirks.
      if (hasBadBidiRects(cm.display.measure) && (order = getOrder(line, cm.doc.direction)))
        { builder.addToken = buildTokenBadBidi(builder.addToken, order); }
      builder.map = [];
      var allowFrontierUpdate = lineView != cm.display.externalMeasured && lineNo(line);
      insertLineContent(line, builder, getLineStyles(cm, line, allowFrontierUpdate));
      if (line.styleClasses) {
        if (line.styleClasses.bgClass)
          { builder.bgClass = joinClasses(line.styleClasses.bgClass, builder.bgClass || ""); }
        if (line.styleClasses.textClass)
          { builder.textClass = joinClasses(line.styleClasses.textClass, builder.textClass || ""); }
      }

      // Ensure at least a single node is present, for measuring.
      if (builder.map.length == 0)
        { builder.map.push(0, 0, builder.content.appendChild(zeroWidthElement(cm.display.measure))); }

      // Store the map and a cache object for the current logical line
      if (i == 0) {
        lineView.measure.map = builder.map;
        lineView.measure.cache = {};
      } else {
  (lineView.measure.maps || (lineView.measure.maps = [])).push(builder.map)
        ;(lineView.measure.caches || (lineView.measure.caches = [])).push({});
      }
    }

    // See issue #2901
    if (webkit) {
      var last = builder.content.lastChild;
      if (/\bcm-tab\b/.test(last.className) || (last.querySelector && last.querySelector(".cm-tab")))
        { builder.content.className = "cm-tab-wrap-hack"; }
    }

    signal(cm, "renderLine", cm, lineView.line, builder.pre);
    if (builder.pre.className)
      { builder.textClass = joinClasses(builder.pre.className, builder.textClass || ""); }

    return builder
  }

  function defaultSpecialCharPlaceholder(ch) {
    var token = elt("span", "\u2022", "cm-invalidchar");
    token.title = "\\u" + ch.charCodeAt(0).toString(16);
    token.setAttribute("aria-label", token.title);
    return token
  }

  // Build up the DOM representation for a single token, and add it to
  // the line map. Takes care to render special characters separately.
  function buildToken(builder, text, style, startStyle, endStyle, css, attributes) {
    if (!text) { return }
    var displayText = builder.splitSpaces ? splitSpaces(text, builder.trailingSpace) : text;
    var special = builder.cm.state.specialChars, mustWrap = false;
    var content;
    if (!special.test(text)) {
      builder.col += text.length;
      content = document.createTextNode(displayText);
      builder.map.push(builder.pos, builder.pos + text.length, content);
      if (ie && ie_version < 9) { mustWrap = true; }
      builder.pos += text.length;
    } else {
      content = document.createDocumentFragment();
      var pos = 0;
      while (true) {
        special.lastIndex = pos;
        var m = special.exec(text);
        var skipped = m ? m.index - pos : text.length - pos;
        if (skipped) {
          var txt = document.createTextNode(displayText.slice(pos, pos + skipped));
          if (ie && ie_version < 9) { content.appendChild(elt("span", [txt])); }
          else { content.appendChild(txt); }
          builder.map.push(builder.pos, builder.pos + skipped, txt);
          builder.col += skipped;
          builder.pos += skipped;
        }
        if (!m) { break }
        pos += skipped + 1;
        var txt$1 = (void 0);
        if (m[0] == "\t") {
          var tabSize = builder.cm.options.tabSize, tabWidth = tabSize - builder.col % tabSize;
          txt$1 = content.appendChild(elt("span", spaceStr(tabWidth), "cm-tab"));
          txt$1.setAttribute("role", "presentation");
          txt$1.setAttribute("cm-text", "\t");
          builder.col += tabWidth;
        } else if (m[0] == "\r" || m[0] == "\n") {
          txt$1 = content.appendChild(elt("span", m[0] == "\r" ? "\u240d" : "\u2424", "cm-invalidchar"));
          txt$1.setAttribute("cm-text", m[0]);
          builder.col += 1;
        } else {
          txt$1 = builder.cm.options.specialCharPlaceholder(m[0]);
          txt$1.setAttribute("cm-text", m[0]);
          if (ie && ie_version < 9) { content.appendChild(elt("span", [txt$1])); }
          else { content.appendChild(txt$1); }
          builder.col += 1;
        }
        builder.map.push(builder.pos, builder.pos + 1, txt$1);
        builder.pos++;
      }
    }
    builder.trailingSpace = displayText.charCodeAt(text.length - 1) == 32;
    if (style || startStyle || endStyle || mustWrap || css) {
      var fullStyle = style || "";
      if (startStyle) { fullStyle += startStyle; }
      if (endStyle) { fullStyle += endStyle; }
      var token = elt("span", [content], fullStyle, css);
      if (attributes) {
        for (var attr in attributes) { if (attributes.hasOwnProperty(attr) && attr != "style" && attr != "class")
          { token.setAttribute(attr, attributes[attr]); } }
      }
      return builder.content.appendChild(token)
    }
    builder.content.appendChild(content);
  }

  // Change some spaces to NBSP to prevent the browser from collapsing
  // trailing spaces at the end of a line when rendering text (issue #1362).
  function splitSpaces(text, trailingBefore) {
    if (text.length > 1 && !/  /.test(text)) { return text }
    var spaceBefore = trailingBefore, result = "";
    for (var i = 0; i < text.length; i++) {
      var ch = text.charAt(i);
      if (ch == " " && spaceBefore && (i == text.length - 1 || text.charCodeAt(i + 1) == 32))
        { ch = "\u00a0"; }
      result += ch;
      spaceBefore = ch == " ";
    }
    return result
  }

  // Work around nonsense dimensions being reported for stretches of
  // right-to-left text.
  function buildTokenBadBidi(inner, order) {
    return function (builder, text, style, startStyle, endStyle, css, attributes) {
      style = style ? style + " cm-force-border" : "cm-force-border";
      var start = builder.pos, end = start + text.length;
      for (;;) {
        // Find the part that overlaps with the start of this text
        var part = (void 0);
        for (var i = 0; i < order.length; i++) {
          part = order[i];
          if (part.to > start && part.from <= start) { break }
        }
        if (part.to >= end) { return inner(builder, text, style, startStyle, endStyle, css, attributes) }
        inner(builder, text.slice(0, part.to - start), style, startStyle, null, css, attributes);
        startStyle = null;
        text = text.slice(part.to - start);
        start = part.to;
      }
    }
  }

  function buildCollapsedSpan(builder, size, marker, ignoreWidget) {
    var widget = !ignoreWidget && marker.widgetNode;
    if (widget) { builder.map.push(builder.pos, builder.pos + size, widget); }
    if (!ignoreWidget && builder.cm.display.input.needsContentAttribute) {
      if (!widget)
        { widget = builder.content.appendChild(document.createElement("span")); }
      widget.setAttribute("cm-marker", marker.id);
    }
    if (widget) {
      builder.cm.display.input.setUneditable(widget);
      builder.content.appendChild(widget);
    }
    builder.pos += size;
    builder.trailingSpace = false;
  }

  // Outputs a number of spans to make up a line, taking highlighting
  // and marked text into account.
  function insertLineContent(line, builder, styles) {
    var spans = line.markedSpans, allText = line.text, at = 0;
    if (!spans) {
      for (var i$1 = 1; i$1 < styles.length; i$1+=2)
        { builder.addToken(builder, allText.slice(at, at = styles[i$1]), interpretTokenStyle(styles[i$1+1], builder.cm.options)); }
      return
    }

    var len = allText.length, pos = 0, i = 1, text = "", style, css;
    var nextChange = 0, spanStyle, spanEndStyle, spanStartStyle, collapsed, attributes;
    for (;;) {
      if (nextChange == pos) { // Update current marker set
        spanStyle = spanEndStyle = spanStartStyle = css = "";
        attributes = null;
        collapsed = null; nextChange = Infinity;
        var foundBookmarks = [], endStyles = (void 0);
        for (var j = 0; j < spans.length; ++j) {
          var sp = spans[j], m = sp.marker;
          if (m.type == "bookmark" && sp.from == pos && m.widgetNode) {
            foundBookmarks.push(m);
          } else if (sp.from <= pos && (sp.to == null || sp.to > pos || m.collapsed && sp.to == pos && sp.from == pos)) {
            if (sp.to != null && sp.to != pos && nextChange > sp.to) {
              nextChange = sp.to;
              spanEndStyle = "";
            }
            if (m.className) { spanStyle += " " + m.className; }
            if (m.css) { css = (css ? css + ";" : "") + m.css; }
            if (m.startStyle && sp.from == pos) { spanStartStyle += " " + m.startStyle; }
            if (m.endStyle && sp.to == nextChange) { (endStyles || (endStyles = [])).push(m.endStyle, sp.to); }
            // support for the old title property
            // https://github.com/codemirror/CodeMirror/pull/5673
            if (m.title) { (attributes || (attributes = {})).title = m.title; }
            if (m.attributes) {
              for (var attr in m.attributes)
                { (attributes || (attributes = {}))[attr] = m.attributes[attr]; }
            }
            if (m.collapsed && (!collapsed || compareCollapsedMarkers(collapsed.marker, m) < 0))
              { collapsed = sp; }
          } else if (sp.from > pos && nextChange > sp.from) {
            nextChange = sp.from;
          }
        }
        if (endStyles) { for (var j$1 = 0; j$1 < endStyles.length; j$1 += 2)
          { if (endStyles[j$1 + 1] == nextChange) { spanEndStyle += " " + endStyles[j$1]; } } }

        if (!collapsed || collapsed.from == pos) { for (var j$2 = 0; j$2 < foundBookmarks.length; ++j$2)
          { buildCollapsedSpan(builder, 0, foundBookmarks[j$2]); } }
        if (collapsed && (collapsed.from || 0) == pos) {
          buildCollapsedSpan(builder, (collapsed.to == null ? len + 1 : collapsed.to) - pos,
                             collapsed.marker, collapsed.from == null);
          if (collapsed.to == null) { return }
          if (collapsed.to == pos) { collapsed = false; }
        }
      }
      if (pos >= len) { break }

      var upto = Math.min(len, nextChange);
      while (true) {
        if (text) {
          var end = pos + text.length;
          if (!collapsed) {
            var tokenText = end > upto ? text.slice(0, upto - pos) : text;
            builder.addToken(builder, tokenText, style ? style + spanStyle : spanStyle,
                             spanStartStyle, pos + tokenText.length == nextChange ? spanEndStyle : "", css, attributes);
          }
          if (end >= upto) {text = text.slice(upto - pos); pos = upto; break}
          pos = end;
          spanStartStyle = "";
        }
        text = allText.slice(at, at = styles[i++]);
        style = interpretTokenStyle(styles[i++], builder.cm.options);
      }
    }
  }


  // These objects are used to represent the visible (currently drawn)
  // part of the document. A LineView may correspond to multiple
  // logical lines, if those are connected by collapsed ranges.
  function LineView(doc, line, lineN) {
    // The starting line
    this.line = line;
    // Continuing lines, if any
    this.rest = visualLineContinued(line);
    // Number of logical lines in this visual line
    this.size = this.rest ? lineNo(lst(this.rest)) - lineN + 1 : 1;
    this.node = this.text = null;
    this.hidden = lineIsHidden(doc, line);
  }

  // Create a range of LineView objects for the given lines.
  function buildViewArray(cm, from, to) {
    var array = [], nextPos;
    for (var pos = from; pos < to; pos = nextPos) {
      var view = new LineView(cm.doc, getLine(cm.doc, pos), pos);
      nextPos = pos + view.size;
      array.push(view);
    }
    return array
  }

  var operationGroup = null;

  function pushOperation(op) {
    if (operationGroup) {
      operationGroup.ops.push(op);
    } else {
      op.ownsGroup = operationGroup = {
        ops: [op],
        delayedCallbacks: []
      };
    }
  }

  function fireCallbacksForOps(group) {
    // Calls delayed callbacks and cursorActivity handlers until no
    // new ones appear
    var callbacks = group.delayedCallbacks, i = 0;
    do {
      for (; i < callbacks.length; i++)
        { callbacks[i].call(null); }
      for (var j = 0; j < group.ops.length; j++) {
        var op = group.ops[j];
        if (op.cursorActivityHandlers)
          { while (op.cursorActivityCalled < op.cursorActivityHandlers.length)
            { op.cursorActivityHandlers[op.cursorActivityCalled++].call(null, op.cm); } }
      }
    } while (i < callbacks.length)
  }

  function finishOperation(op, endCb) {
    var group = op.ownsGroup;
    if (!group) { return }

    try { fireCallbacksForOps(group); }
    finally {
      operationGroup = null;
      endCb(group);
    }
  }

  var orphanDelayedCallbacks = null;

  // Often, we want to signal events at a point where we are in the
  // middle of some work, but don't want the handler to start calling
  // other methods on the editor, which might be in an inconsistent
  // state or simply not expect any other events to happen.
  // signalLater looks whether there are any handlers, and schedules
  // them to be executed when the last operation ends, or, if no
  // operation is active, when a timeout fires.
  function signalLater(emitter, type /*, values...*/) {
    var arr = getHandlers(emitter, type);
    if (!arr.length) { return }
    var args = Array.prototype.slice.call(arguments, 2), list;
    if (operationGroup) {
      list = operationGroup.delayedCallbacks;
    } else if (orphanDelayedCallbacks) {
      list = orphanDelayedCallbacks;
    } else {
      list = orphanDelayedCallbacks = [];
      setTimeout(fireOrphanDelayed, 0);
    }
    var loop = function ( i ) {
      list.push(function () { return arr[i].apply(null, args); });
    };

    for (var i = 0; i < arr.length; ++i)
      loop( i );
  }

  function fireOrphanDelayed() {
    var delayed = orphanDelayedCallbacks;
    orphanDelayedCallbacks = null;
    for (var i = 0; i < delayed.length; ++i) { delayed[i](); }
  }

  // When an aspect of a line changes, a string is added to
  // lineView.changes. This updates the relevant part of the line's
  // DOM structure.
  function updateLineForChanges(cm, lineView, lineN, dims) {
    for (var j = 0; j < lineView.changes.length; j++) {
      var type = lineView.changes[j];
      if (type == "text") { updateLineText(cm, lineView); }
      else if (type == "gutter") { updateLineGutter(cm, lineView, lineN, dims); }
      else if (type == "class") { updateLineClasses(cm, lineView); }
      else if (type == "widget") { updateLineWidgets(cm, lineView, dims); }
    }
    lineView.changes = null;
  }

  // Lines with gutter elements, widgets or a background class need to
  // be wrapped, and have the extra elements added to the wrapper div
  function ensureLineWrapped(lineView) {
    if (lineView.node == lineView.text) {
      lineView.node = elt("div", null, null, "position: relative");
      if (lineView.text.parentNode)
        { lineView.text.parentNode.replaceChild(lineView.node, lineView.text); }
      lineView.node.appendChild(lineView.text);
      if (ie && ie_version < 8) { lineView.node.style.zIndex = 2; }
    }
    return lineView.node
  }

  function updateLineBackground(cm, lineView) {
    var cls = lineView.bgClass ? lineView.bgClass + " " + (lineView.line.bgClass || "") : lineView.line.bgClass;
    if (cls) { cls += " CodeMirror-linebackground"; }
    if (lineView.background) {
      if (cls) { lineView.background.className = cls; }
      else { lineView.background.parentNode.removeChild(lineView.background); lineView.background = null; }
    } else if (cls) {
      var wrap = ensureLineWrapped(lineView);
      lineView.background = wrap.insertBefore(elt("div", null, cls), wrap.firstChild);
      cm.display.input.setUneditable(lineView.background);
    }
  }

  // Wrapper around buildLineContent which will reuse the structure
  // in display.externalMeasured when possible.
  function getLineContent(cm, lineView) {
    var ext = cm.display.externalMeasured;
    if (ext && ext.line == lineView.line) {
      cm.display.externalMeasured = null;
      lineView.measure = ext.measure;
      return ext.built
    }
    return buildLineContent(cm, lineView)
  }

  // Redraw the line's text. Interacts with the background and text
  // classes because the mode may output tokens that influence these
  // classes.
  function updateLineText(cm, lineView) {
    var cls = lineView.text.className;
    var built = getLineContent(cm, lineView);
    if (lineView.text == lineView.node) { lineView.node = built.pre; }
    lineView.text.parentNode.replaceChild(built.pre, lineView.text);
    lineView.text = built.pre;
    if (built.bgClass != lineView.bgClass || built.textClass != lineView.textClass) {
      lineView.bgClass = built.bgClass;
      lineView.textClass = built.textClass;
      updateLineClasses(cm, lineView);
    } else if (cls) {
      lineView.text.className = cls;
    }
  }

  function updateLineClasses(cm, lineView) {
    updateLineBackground(cm, lineView);
    if (lineView.line.wrapClass)
      { ensureLineWrapped(lineView).className = lineView.line.wrapClass; }
    else if (lineView.node != lineView.text)
      { lineView.node.className = ""; }
    var textClass = lineView.textClass ? lineView.textClass + " " + (lineView.line.textClass || "") : lineView.line.textClass;
    lineView.text.className = textClass || "";
  }

  function updateLineGutter(cm, lineView, lineN, dims) {
    if (lineView.gutter) {
      lineView.node.removeChild(lineView.gutter);
      lineView.gutter = null;
    }
    if (lineView.gutterBackground) {
      lineView.node.removeChild(lineView.gutterBackground);
      lineView.gutterBackground = null;
    }
    if (lineView.line.gutterClass) {
      var wrap = ensureLineWrapped(lineView);
      lineView.gutterBackground = elt("div", null, "CodeMirror-gutter-background " + lineView.line.gutterClass,
                                      ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px; width: " + (dims.gutterTotalWidth) + "px"));
      cm.display.input.setUneditable(lineView.gutterBackground);
      wrap.insertBefore(lineView.gutterBackground, lineView.text);
    }
    var markers = lineView.line.gutterMarkers;
    if (cm.options.lineNumbers || markers) {
      var wrap$1 = ensureLineWrapped(lineView);
      var gutterWrap = lineView.gutter = elt("div", null, "CodeMirror-gutter-wrapper", ("left: " + (cm.options.fixedGutter ? dims.fixedPos : -dims.gutterTotalWidth) + "px"));
      cm.display.input.setUneditable(gutterWrap);
      wrap$1.insertBefore(gutterWrap, lineView.text);
      if (lineView.line.gutterClass)
        { gutterWrap.className += " " + lineView.line.gutterClass; }
      if (cm.options.lineNumbers && (!markers || !markers["CodeMirror-linenumbers"]))
        { lineView.lineNumber = gutterWrap.appendChild(
          elt("div", lineNumberFor(cm.options, lineN),
              "CodeMirror-linenumber CodeMirror-gutter-elt",
              ("left: " + (dims.gutterLeft["CodeMirror-linenumbers"]) + "px; width: " + (cm.display.lineNumInnerWidth) + "px"))); }
      if (markers) { for (var k = 0; k < cm.display.gutterSpecs.length; ++k) {
        var id = cm.display.gutterSpecs[k].className, found = markers.hasOwnProperty(id) && markers[id];
        if (found)
          { gutterWrap.appendChild(elt("div", [found], "CodeMirror-gutter-elt",
                                     ("left: " + (dims.gutterLeft[id]) + "px; width: " + (dims.gutterWidth[id]) + "px"))); }
      } }
    }
  }

  function updateLineWidgets(cm, lineView, dims) {
    if (lineView.alignable) { lineView.alignable = null; }
    var isWidget = classTest("CodeMirror-linewidget");
    for (var node = lineView.node.firstChild, next = (void 0); node; node = next) {
      next = node.nextSibling;
      if (isWidget.test(node.className)) { lineView.node.removeChild(node); }
    }
    insertLineWidgets(cm, lineView, dims);
  }

  // Build a line's DOM representation from scratch
  function buildLineElement(cm, lineView, lineN, dims) {
    var built = getLineContent(cm, lineView);
    lineView.text = lineView.node = built.pre;
    if (built.bgClass) { lineView.bgClass = built.bgClass; }
    if (built.textClass) { lineView.textClass = built.textClass; }

    updateLineClasses(cm, lineView);
    updateLineGutter(cm, lineView, lineN, dims);
    insertLineWidgets(cm, lineView, dims);
    return lineView.node
  }

  // A lineView may contain multiple logical lines (when merged by
  // collapsed spans). The widgets for all of them need to be drawn.
  function insertLineWidgets(cm, lineView, dims) {
    insertLineWidgetsFor(cm, lineView.line, lineView, dims, true);
    if (lineView.rest) { for (var i = 0; i < lineView.rest.length; i++)
      { insertLineWidgetsFor(cm, lineView.rest[i], lineView, dims, false); } }
  }

  function insertLineWidgetsFor(cm, line, lineView, dims, allowAbove) {
    if (!line.widgets) { return }
    var wrap = ensureLineWrapped(lineView);
    for (var i = 0, ws = line.widgets; i < ws.length; ++i) {
      var widget = ws[i], node = elt("div", [widget.node], "CodeMirror-linewidget" + (widget.className ? " " + widget.className : ""));
      if (!widget.handleMouseEvents) { node.setAttribute("cm-ignore-events", "true"); }
      positionLineWidget(widget, node, lineView, dims);
      cm.display.input.setUneditable(node);
      if (allowAbove && widget.above)
        { wrap.insertBefore(node, lineView.gutter || lineView.text); }
      else
        { wrap.appendChild(node); }
      signalLater(widget, "redraw");
    }
  }

  function positionLineWidget(widget, node, lineView, dims) {
    if (widget.noHScroll) {
  (lineView.alignable || (lineView.alignable = [])).push(node);
      var width = dims.wrapperWidth;
      node.style.left = dims.fixedPos + "px";
      if (!widget.coverGutter) {
        width -= dims.gutterTotalWidth;
        node.style.paddingLeft = dims.gutterTotalWidth + "px";
      }
      node.style.width = width + "px";
    }
    if (widget.coverGutter) {
      node.style.zIndex = 5;
      node.style.position = "relative";
      if (!widget.noHScroll) { node.style.marginLeft = -dims.gutterTotalWidth + "px"; }
    }
  }

  function widgetHeight(widget) {
    if (widget.height != null) { return widget.height }
    var cm = widget.doc.cm;
    if (!cm) { return 0 }
    if (!contains(document.body, widget.node)) {
      var parentStyle = "position: relative;";
      if (widget.coverGutter)
        { parentStyle += "margin-left: -" + cm.display.gutters.offsetWidth + "px;"; }
      if (widget.noHScroll)
        { parentStyle += "width: " + cm.display.wrapper.clientWidth + "px;"; }
      removeChildrenAndAdd(cm.display.measure, elt("div", [widget.node], null, parentStyle));
    }
    return widget.height = widget.node.parentNode.offsetHeight
  }

  // Return true when the given mouse event happened in a widget
  function eventInWidget(display, e) {
    for (var n = e_target(e); n != display.wrapper; n = n.parentNode) {
      if (!n || (n.nodeType == 1 && n.getAttribute("cm-ignore-events") == "true") ||
          (n.parentNode == display.sizer && n != display.mover))
        { return true }
    }
  }

  // POSITION MEASUREMENT

  function paddingTop(display) {return display.lineSpace.offsetTop}
  function paddingVert(display) {return display.mover.offsetHeight - display.lineSpace.offsetHeight}
  function paddingH(display) {
    if (display.cachedPaddingH) { return display.cachedPaddingH }
    var e = removeChildrenAndAdd(display.measure, elt("pre", "x", "CodeMirror-line-like"));
    var style = window.getComputedStyle ? window.getComputedStyle(e) : e.currentStyle;
    var data = {left: parseInt(style.paddingLeft), right: parseInt(style.paddingRight)};
    if (!isNaN(data.left) && !isNaN(data.right)) { display.cachedPaddingH = data; }
    return data
  }

  function scrollGap(cm) { return scrollerGap - cm.display.nativeBarWidth }
  function displayWidth(cm) {
    return cm.display.scroller.clientWidth - scrollGap(cm) - cm.display.barWidth
  }
  function displayHeight(cm) {
    return cm.display.scroller.clientHeight - scrollGap(cm) - cm.display.barHeight
  }

  // Ensure the lineView.wrapping.heights array is populated. This is
  // an array of bottom offsets for the lines that make up a drawn
  // line. When lineWrapping is on, there might be more than one
  // height.
  function ensureLineHeights(cm, lineView, rect) {
    var wrapping = cm.options.lineWrapping;
    var curWidth = wrapping && displayWidth(cm);
    if (!lineView.measure.heights || wrapping && lineView.measure.width != curWidth) {
      var heights = lineView.measure.heights = [];
      if (wrapping) {
        lineView.measure.width = curWidth;
        var rects = lineView.text.firstChild.getClientRects();
        for (var i = 0; i < rects.length - 1; i++) {
          var cur = rects[i], next = rects[i + 1];
          if (Math.abs(cur.bottom - next.bottom) > 2)
            { heights.push((cur.bottom + next.top) / 2 - rect.top); }
        }
      }
      heights.push(rect.bottom - rect.top);
    }
  }

  // Find a line map (mapping character offsets to text nodes) and a
  // measurement cache for the given line number. (A line view might
  // contain multiple lines when collapsed ranges are present.)
  function mapFromLineView(lineView, line, lineN) {
    if (lineView.line == line)
      { return {map: lineView.measure.map, cache: lineView.measure.cache} }
    for (var i = 0; i < lineView.rest.length; i++)
      { if (lineView.rest[i] == line)
        { return {map: lineView.measure.maps[i], cache: lineView.measure.caches[i]} } }
    for (var i$1 = 0; i$1 < lineView.rest.length; i$1++)
      { if (lineNo(lineView.rest[i$1]) > lineN)
        { return {map: lineView.measure.maps[i$1], cache: lineView.measure.caches[i$1], before: true} } }
  }

  // Render a line into the hidden node display.externalMeasured. Used
  // when measurement is needed for a line that's not in the viewport.
  function updateExternalMeasurement(cm, line) {
    line = visualLine(line);
    var lineN = lineNo(line);
    var view = cm.display.externalMeasured = new LineView(cm.doc, line, lineN);
    view.lineN = lineN;
    var built = view.built = buildLineContent(cm, view);
    view.text = built.pre;
    removeChildrenAndAdd(cm.display.lineMeasure, built.pre);
    return view
  }

  // Get a {top, bottom, left, right} box (in line-local coordinates)
  // for a given character.
  function measureChar(cm, line, ch, bias) {
    return measureCharPrepared(cm, prepareMeasureForLine(cm, line), ch, bias)
  }

  // Find a line view that corresponds to the given line number.
  function findViewForLine(cm, lineN) {
    if (lineN >= cm.display.viewFrom && lineN < cm.display.viewTo)
      { return cm.display.view[findViewIndex(cm, lineN)] }
    var ext = cm.display.externalMeasured;
    if (ext && lineN >= ext.lineN && lineN < ext.lineN + ext.size)
      { return ext }
  }

  // Measurement can be split in two steps, the set-up work that
  // applies to the whole line, and the measurement of the actual
  // character. Functions like coordsChar, that need to do a lot of
  // measurements in a row, can thus ensure that the set-up work is
  // only done once.
  function prepareMeasureForLine(cm, line) {
    var lineN = lineNo(line);
    var view = findViewForLine(cm, lineN);
    if (view && !view.text) {
      view = null;
    } else if (view && view.changes) {
      updateLineForChanges(cm, view, lineN, getDimensions(cm));
      cm.curOp.forceUpdate = true;
    }
    if (!view)
      { view = updateExternalMeasurement(cm, line); }

    var info = mapFromLineView(view, line, lineN);
    return {
      line: line, view: view, rect: null,
      map: info.map, cache: info.cache, before: info.before,
      hasHeights: false
    }
  }

  // Given a prepared measurement object, measures the position of an
  // actual character (or fetches it from the cache).
  function measureCharPrepared(cm, prepared, ch, bias, varHeight) {
    if (prepared.before) { ch = -1; }
    var key = ch + (bias || ""), found;
    if (prepared.cache.hasOwnProperty(key)) {
      found = prepared.cache[key];
    } else {
      if (!prepared.rect)
        { prepared.rect = prepared.view.text.getBoundingClientRect(); }
      if (!prepared.hasHeights) {
        ensureLineHeights(cm, prepared.view, prepared.rect);
        prepared.hasHeights = true;
      }
      found = measureCharInner(cm, prepared, ch, bias);
      if (!found.bogus) { prepared.cache[key] = found; }
    }
    return {left: found.left, right: found.right,
            top: varHeight ? found.rtop : found.top,
            bottom: varHeight ? found.rbottom : found.bottom}
  }

  var nullRect = {left: 0, right: 0, top: 0, bottom: 0};

  function nodeAndOffsetInLineMap(map, ch, bias) {
    var node, start, end, collapse, mStart, mEnd;
    // First, search the line map for the text node corresponding to,
    // or closest to, the target character.
    for (var i = 0; i < map.length; i += 3) {
      mStart = map[i];
      mEnd = map[i + 1];
      if (ch < mStart) {
        start = 0; end = 1;
        collapse = "left";
      } else if (ch < mEnd) {
        start = ch - mStart;
        end = start + 1;
      } else if (i == map.length - 3 || ch == mEnd && map[i + 3] > ch) {
        end = mEnd - mStart;
        start = end - 1;
        if (ch >= mEnd) { collapse = "right"; }
      }
      if (start != null) {
        node = map[i + 2];
        if (mStart == mEnd && bias == (node.insertLeft ? "left" : "right"))
          { collapse = bias; }
        if (bias == "left" && start == 0)
          { while (i && map[i - 2] == map[i - 3] && map[i - 1].insertLeft) {
            node = map[(i -= 3) + 2];
            collapse = "left";
          } }
        if (bias == "right" && start == mEnd - mStart)
          { while (i < map.length - 3 && map[i + 3] == map[i + 4] && !map[i + 5].insertLeft) {
            node = map[(i += 3) + 2];
            collapse = "right";
          } }
        break
      }
    }
    return {node: node, start: start, end: end, collapse: collapse, coverStart: mStart, coverEnd: mEnd}
  }

  function getUsefulRect(rects, bias) {
    var rect = nullRect;
    if (bias == "left") { for (var i = 0; i < rects.length; i++) {
      if ((rect = rects[i]).left != rect.right) { break }
    } } else { for (var i$1 = rects.length - 1; i$1 >= 0; i$1--) {
      if ((rect = rects[i$1]).left != rect.right) { break }
    } }
    return rect
  }

  function measureCharInner(cm, prepared, ch, bias) {
    var place = nodeAndOffsetInLineMap(prepared.map, ch, bias);
    var node = place.node, start = place.start, end = place.end, collapse = place.collapse;

    var rect;
    if (node.nodeType == 3) { // If it is a text node, use a range to retrieve the coordinates.
      for (var i$1 = 0; i$1 < 4; i$1++) { // Retry a maximum of 4 times when nonsense rectangles are returned
        while (start && isExtendingChar(prepared.line.text.charAt(place.coverStart + start))) { --start; }
        while (place.coverStart + end < place.coverEnd && isExtendingChar(prepared.line.text.charAt(place.coverStart + end))) { ++end; }
        if (ie && ie_version < 9 && start == 0 && end == place.coverEnd - place.coverStart)
          { rect = node.parentNode.getBoundingClientRect(); }
        else
          { rect = getUsefulRect(range(node, start, end).getClientRects(), bias); }
        if (rect.left || rect.right || start == 0) { break }
        end = start;
        start = start - 1;
        collapse = "right";
      }
      if (ie && ie_version < 11) { rect = maybeUpdateRectForZooming(cm.display.measure, rect); }
    } else { // If it is a widget, simply get the box for the whole widget.
      if (start > 0) { collapse = bias = "right"; }
      var rects;
      if (cm.options.lineWrapping && (rects = node.getClientRects()).length > 1)
        { rect = rects[bias == "right" ? rects.length - 1 : 0]; }
      else
        { rect = node.getBoundingClientRect(); }
    }
    if (ie && ie_version < 9 && !start && (!rect || !rect.left && !rect.right)) {
      var rSpan = node.parentNode.getClientRects()[0];
      if (rSpan)
        { rect = {left: rSpan.left, right: rSpan.left + charWidth(cm.display), top: rSpan.top, bottom: rSpan.bottom}; }
      else
        { rect = nullRect; }
    }

    var rtop = rect.top - prepared.rect.top, rbot = rect.bottom - prepared.rect.top;
    var mid = (rtop + rbot) / 2;
    var heights = prepared.view.measure.heights;
    var i = 0;
    for (; i < heights.length - 1; i++)
      { if (mid < heights[i]) { break } }
    var top = i ? heights[i - 1] : 0, bot = heights[i];
    var result = {left: (collapse == "right" ? rect.right : rect.left) - prepared.rect.left,
                  right: (collapse == "left" ? rect.left : rect.right) - prepared.rect.left,
                  top: top, bottom: bot};
    if (!rect.left && !rect.right) { result.bogus = true; }
    if (!cm.options.singleCursorHeightPerLine) { result.rtop = rtop; result.rbottom = rbot; }

    return result
  }

  // Work around problem with bounding client rects on ranges being
  // returned incorrectly when zoomed on IE10 and below.
  function maybeUpdateRectForZooming(measure, rect) {
    if (!window.screen || screen.logicalXDPI == null ||
        screen.logicalXDPI == screen.deviceXDPI || !hasBadZoomedRects(measure))
      { return rect }
    var scaleX = screen.logicalXDPI / screen.deviceXDPI;
    var scaleY = screen.logicalYDPI / screen.deviceYDPI;
    return {left: rect.left * scaleX, right: rect.right * scaleX,
            top: rect.top * scaleY, bottom: rect.bottom * scaleY}
  }

  function clearLineMeasurementCacheFor(lineView) {
    if (lineView.measure) {
      lineView.measure.cache = {};
      lineView.measure.heights = null;
      if (lineView.rest) { for (var i = 0; i < lineView.rest.length; i++)
        { lineView.measure.caches[i] = {}; } }
    }
  }

  function clearLineMeasurementCache(cm) {
    cm.display.externalMeasure = null;
    removeChildren(cm.display.lineMeasure);
    for (var i = 0; i < cm.display.view.length; i++)
      { clearLineMeasurementCacheFor(cm.display.view[i]); }
  }

  function clearCaches(cm) {
    clearLineMeasurementCache(cm);
    cm.display.cachedCharWidth = cm.display.cachedTextHeight = cm.display.cachedPaddingH = null;
    if (!cm.options.lineWrapping) { cm.display.maxLineChanged = true; }
    cm.display.lineNumChars = null;
  }

  function pageScrollX() {
    // Work around https://bugs.chromium.org/p/chromium/issues/detail?id=489206
    // which causes page_Offset and bounding client rects to use
    // different reference viewports and invalidate our calculations.
    if (chrome && android) { return -(document.body.getBoundingClientRect().left - parseInt(getComputedStyle(document.body).marginLeft)) }
    return window.pageXOffset || (document.documentElement || document.body).scrollLeft
  }
  function pageScrollY() {
    if (chrome && android) { return -(document.body.getBoundingClientRect().top - parseInt(getComputedStyle(document.body).marginTop)) }
    return window.pageYOffset || (document.documentElement || document.body).scrollTop
  }

  function widgetTopHeight(lineObj) {
    var height = 0;
    if (lineObj.widgets) { for (var i = 0; i < lineObj.widgets.length; ++i) { if (lineObj.widgets[i].above)
      { height += widgetHeight(lineObj.widgets[i]); } } }
    return height
  }

  // Converts a {top, bottom, left, right} box from line-local
  // coordinates into another coordinate system. Context may be one of
  // "line", "div" (display.lineDiv), "local"./null (editor), "window",
  // or "page".
  function intoCoordSystem(cm, lineObj, rect, context, includeWidgets) {
    if (!includeWidgets) {
      var height = widgetTopHeight(lineObj);
      rect.top += height; rect.bottom += height;
    }
    if (context == "line") { return rect }
    if (!context) { context = "local"; }
    var yOff = heightAtLine(lineObj);
    if (context == "local") { yOff += paddingTop(cm.display); }
    else { yOff -= cm.display.viewOffset; }
    if (context == "page" || context == "window") {
      var lOff = cm.display.lineSpace.getBoundingClientRect();
      yOff += lOff.top + (context == "window" ? 0 : pageScrollY());
      var xOff = lOff.left + (context == "window" ? 0 : pageScrollX());
      rect.left += xOff; rect.right += xOff;
    }
    rect.top += yOff; rect.bottom += yOff;
    return rect
  }

  // Coverts a box from "div" coords to another coordinate system.
  // Context may be "window", "page", "div", or "local"./null.
  function fromCoordSystem(cm, coords, context) {
    if (context == "div") { return coords }
    var left = coords.left, top = coords.top;
    // First move into "page" coordinate system
    if (context == "page") {
      left -= pageScrollX();
      top -= pageScrollY();
    } else if (context == "local" || !context) {
      var localBox = cm.display.sizer.getBoundingClientRect();
      left += localBox.left;
      top += localBox.top;
    }

    var lineSpaceBox = cm.display.lineSpace.getBoundingClientRect();
    return {left: left - lineSpaceBox.left, top: top - lineSpaceBox.top}
  }

  function charCoords(cm, pos, context, lineObj, bias) {
    if (!lineObj) { lineObj = getLine(cm.doc, pos.line); }
    return intoCoordSystem(cm, lineObj, measureChar(cm, lineObj, pos.ch, bias), context)
  }

  // Returns a box for a given cursor position, which may have an
  // 'other' property containing the position of the secondary cursor
  // on a bidi boundary.
  // A cursor Pos(line, char, "before") is on the same visual line as `char - 1`
  // and after `char - 1` in writing order of `char - 1`
  // A cursor Pos(line, char, "after") is on the same visual line as `char`
  // and before `char` in writing order of `char`
  // Examples (upper-case letters are RTL, lower-case are LTR):
  //     Pos(0, 1, ...)
  //     before   after
  // ab     a|b     a|b
  // aB     a|B     aB|
  // Ab     |Ab     A|b
  // AB     B|A     B|A
  // Every position after the last character on a line is considered to stick
  // to the last character on the line.
  function cursorCoords(cm, pos, context, lineObj, preparedMeasure, varHeight) {
    lineObj = lineObj || getLine(cm.doc, pos.line);
    if (!preparedMeasure) { preparedMeasure = prepareMeasureForLine(cm, lineObj); }
    function get(ch, right) {
      var m = measureCharPrepared(cm, preparedMeasure, ch, right ? "right" : "left", varHeight);
      if (right) { m.left = m.right; } else { m.right = m.left; }
      return intoCoordSystem(cm, lineObj, m, context)
    }
    var order = getOrder(lineObj, cm.doc.direction), ch = pos.ch, sticky = pos.sticky;
    if (ch >= lineObj.text.length) {
      ch = lineObj.text.length;
      sticky = "before";
    } else if (ch <= 0) {
      ch = 0;
      sticky = "after";
    }
    if (!order) { return get(sticky == "before" ? ch - 1 : ch, sticky == "before") }

    function getBidi(ch, partPos, invert) {
      var part = order[partPos], right = part.level == 1;
      return get(invert ? ch - 1 : ch, right != invert)
    }
    var partPos = getBidiPartAt(order, ch, sticky);
    var other = bidiOther;
    var val = getBidi(ch, partPos, sticky == "before");
    if (other != null) { val.other = getBidi(ch, other, sticky != "before"); }
    return val
  }

  // Used to cheaply estimate the coordinates for a position. Used for
  // intermediate scroll updates.
  function estimateCoords(cm, pos) {
    var left = 0;
    pos = clipPos(cm.doc, pos);
    if (!cm.options.lineWrapping) { left = charWidth(cm.display) * pos.ch; }
    var lineObj = getLine(cm.doc, pos.line);
    var top = heightAtLine(lineObj) + paddingTop(cm.display);
    return {left: left, right: left, top: top, bottom: top + lineObj.height}
  }

  // Positions returned by coordsChar contain some extra information.
  // xRel is the relative x position of the input coordinates compared
  // to the found position (so xRel > 0 means the coordinates are to
  // the right of the character position, for example). When outside
  // is true, that means the coordinates lie outside the line's
  // vertical range.
  function PosWithInfo(line, ch, sticky, outside, xRel) {
    var pos = Pos(line, ch, sticky);
    pos.xRel = xRel;
    if (outside) { pos.outside = outside; }
    return pos
  }

  // Compute the character position closest to the given coordinates.
  // Input must be lineSpace-local ("div" coordinate system).
  function coordsChar(cm, x, y) {
    var doc = cm.doc;
    y += cm.display.viewOffset;
    if (y < 0) { return PosWithInfo(doc.first, 0, null, -1, -1) }
    var lineN = lineAtHeight(doc, y), last = doc.first + doc.size - 1;
    if (lineN > last)
      { return PosWithInfo(doc.first + doc.size - 1, getLine(doc, last).text.length, null, 1, 1) }
    if (x < 0) { x = 0; }

    var lineObj = getLine(doc, lineN);
    for (;;) {
      var found = coordsCharInner(cm, lineObj, lineN, x, y);
      var collapsed = collapsedSpanAround(lineObj, found.ch + (found.xRel > 0 || found.outside > 0 ? 1 : 0));
      if (!collapsed) { return found }
      var rangeEnd = collapsed.find(1);
      if (rangeEnd.line == lineN) { return rangeEnd }
      lineObj = getLine(doc, lineN = rangeEnd.line);
    }
  }

  function wrappedLineExtent(cm, lineObj, preparedMeasure, y) {
    y -= widgetTopHeight(lineObj);
    var end = lineObj.text.length;
    var begin = findFirst(function (ch) { return measureCharPrepared(cm, preparedMeasure, ch - 1).bottom <= y; }, end, 0);
    end = findFirst(function (ch) { return measureCharPrepared(cm, preparedMeasure, ch).top > y; }, begin, end);
    return {begin: begin, end: end}
  }

  function wrappedLineExtentChar(cm, lineObj, preparedMeasure, target) {
    if (!preparedMeasure) { preparedMeasure = prepareMeasureForLine(cm, lineObj); }
    var targetTop = intoCoordSystem(cm, lineObj, measureCharPrepared(cm, preparedMeasure, target), "line").top;
    return wrappedLineExtent(cm, lineObj, preparedMeasure, targetTop)
  }

  // Returns true if the given side of a box is after the given
  // coordinates, in top-to-bottom, left-to-right order.
  function boxIsAfter(box, x, y, left) {
    return box.bottom <= y ? false : box.top > y ? true : (left ? box.left : box.right) > x
  }

  function coordsCharInner(cm, lineObj, lineNo, x, y) {
    // Move y into line-local coordinate space
    y -= heightAtLine(lineObj);
    var preparedMeasure = prepareMeasureForLine(cm, lineObj);
    // When directly calling `measureCharPrepared`, we have to adjust
    // for the widgets at this line.
    var widgetHeight = widgetTopHeight(lineObj);
    var begin = 0, end = lineObj.text.length, ltr = true;

    var order = getOrder(lineObj, cm.doc.direction);
    // If the line isn't plain left-to-right text, first figure out
    // which bidi section the coordinates fall into.
    if (order) {
      var part = (cm.options.lineWrapping ? coordsBidiPartWrapped : coordsBidiPart)
                   (cm, lineObj, lineNo, preparedMeasure, order, x, y);
      ltr = part.level != 1;
      // The awkward -1 offsets are needed because findFirst (called
      // on these below) will treat its first bound as inclusive,
      // second as exclusive, but we want to actually address the
      // characters in the part's range
      begin = ltr ? part.from : part.to - 1;
      end = ltr ? part.to : part.from - 1;
    }

    // A binary search to find the first character whose bounding box
    // starts after the coordinates. If we run across any whose box wrap
    // the coordinates, store that.
    var chAround = null, boxAround = null;
    var ch = findFirst(function (ch) {
      var box = measureCharPrepared(cm, preparedMeasure, ch);
      box.top += widgetHeight; box.bottom += widgetHeight;
      if (!boxIsAfter(box, x, y, false)) { return false }
      if (box.top <= y && box.left <= x) {
        chAround = ch;
        boxAround = box;
      }
      return true
    }, begin, end);

    var baseX, sticky, outside = false;
    // If a box around the coordinates was found, use that
    if (boxAround) {
      // Distinguish coordinates nearer to the left or right side of the box
      var atLeft = x - boxAround.left < boxAround.right - x, atStart = atLeft == ltr;
      ch = chAround + (atStart ? 0 : 1);
      sticky = atStart ? "after" : "before";
      baseX = atLeft ? boxAround.left : boxAround.right;
    } else {
      // (Adjust for extended bound, if necessary.)
      if (!ltr && (ch == end || ch == begin)) { ch++; }
      // To determine which side to associate with, get the box to the
      // left of the character and compare it's vertical position to the
      // coordinates
      sticky = ch == 0 ? "after" : ch == lineObj.text.length ? "before" :
        (measureCharPrepared(cm, preparedMeasure, ch - (ltr ? 1 : 0)).bottom + widgetHeight <= y) == ltr ?
        "after" : "before";
      // Now get accurate coordinates for this place, in order to get a
      // base X position
      var coords = cursorCoords(cm, Pos(lineNo, ch, sticky), "line", lineObj, preparedMeasure);
      baseX = coords.left;
      outside = y < coords.top ? -1 : y >= coords.bottom ? 1 : 0;
    }

    ch = skipExtendingChars(lineObj.text, ch, 1);
    return PosWithInfo(lineNo, ch, sticky, outside, x - baseX)
  }

  function coordsBidiPart(cm, lineObj, lineNo, preparedMeasure, order, x, y) {
    // Bidi parts are sorted left-to-right, and in a non-line-wrapping
    // situation, we can take this ordering to correspond to the visual
    // ordering. This finds the first part whose end is after the given
    // coordinates.
    var index = findFirst(function (i) {
      var part = order[i], ltr = part.level != 1;
      return boxIsAfter(cursorCoords(cm, Pos(lineNo, ltr ? part.to : part.from, ltr ? "before" : "after"),
                                     "line", lineObj, preparedMeasure), x, y, true)
    }, 0, order.length - 1);
    var part = order[index];
    // If this isn't the first part, the part's start is also after
    // the coordinates, and the coordinates aren't on the same line as
    // that start, move one part back.
    if (index > 0) {
      var ltr = part.level != 1;
      var start = cursorCoords(cm, Pos(lineNo, ltr ? part.from : part.to, ltr ? "after" : "before"),
                               "line", lineObj, preparedMeasure);
      if (boxIsAfter(start, x, y, true) && start.top > y)
        { part = order[index - 1]; }
    }
    return part
  }

  function coordsBidiPartWrapped(cm, lineObj, _lineNo, preparedMeasure, order, x, y) {
    // In a wrapped line, rtl text on wrapping boundaries can do things
    // that don't correspond to the ordering in our `order` array at
    // all, so a binary search doesn't work, and we want to return a
    // part that only spans one line so that the binary search in
    // coordsCharInner is safe. As such, we first find the extent of the
    // wrapped line, and then do a flat search in which we discard any
    // spans that aren't on the line.
    var ref = wrappedLineExtent(cm, lineObj, preparedMeasure, y);
    var begin = ref.begin;
    var end = ref.end;
    if (/\s/.test(lineObj.text.charAt(end - 1))) { end--; }
    var part = null, closestDist = null;
    for (var i = 0; i < order.length; i++) {
      var p = order[i];
      if (p.from >= end || p.to <= begin) { continue }
      var ltr = p.level != 1;
      var endX = measureCharPrepared(cm, preparedMeasure, ltr ? Math.min(end, p.to) - 1 : Math.max(begin, p.from)).right;
      // Weigh against spans ending before this, so that they are only
      // picked if nothing ends after
      var dist = endX < x ? x - endX + 1e9 : endX - x;
      if (!part || closestDist > dist) {
        part = p;
        closestDist = dist;
      }
    }
    if (!part) { part = order[order.length - 1]; }
    // Clip the part to the wrapped line.
    if (part.from < begin) { part = {from: begin, to: part.to, level: part.level}; }
    if (part.to > end) { part = {from: part.from, to: end, level: part.level}; }
    return part
  }

  var measureText;
  // Compute the default text height.
  function textHeight(display) {
    if (display.cachedTextHeight != null) { return display.cachedTextHeight }
    if (measureText == null) {
      measureText = elt("pre", null, "CodeMirror-line-like");
      // Measure a bunch of lines, for browsers that compute
      // fractional heights.
      for (var i = 0; i < 49; ++i) {
        measureText.appendChild(document.createTextNode("x"));
        measureText.appendChild(elt("br"));
      }
      measureText.appendChild(document.createTextNode("x"));
    }
    removeChildrenAndAdd(display.measure, measureText);
    var height = measureText.offsetHeight / 50;
    if (height > 3) { display.cachedTextHeight = height; }
    removeChildren(display.measure);
    return height || 1
  }

  // Compute the default character width.
  function charWidth(display) {
    if (display.cachedCharWidth != null) { return display.cachedCharWidth }
    var anchor = elt("span", "xxxxxxxxxx");
    var pre = elt("pre", [anchor], "CodeMirror-line-like");
    removeChildrenAndAdd(display.measure, pre);
    var rect = anchor.getBoundingClientRect(), width = (rect.right - rect.left) / 10;
    if (width > 2) { display.cachedCharWidth = width; }
    return width || 10
  }

  // Do a bulk-read of the DOM positions and sizes needed to draw the
  // view, so that we don't interleave reading and writing to the DOM.
  function getDimensions(cm) {
    var d = cm.display, left = {}, width = {};
    var gutterLeft = d.gutters.clientLeft;
    for (var n = d.gutters.firstChild, i = 0; n; n = n.nextSibling, ++i) {
      var id = cm.display.gutterSpecs[i].className;
      left[id] = n.offsetLeft + n.clientLeft + gutterLeft;
      width[id] = n.clientWidth;
    }
    return {fixedPos: compensateForHScroll(d),
            gutterTotalWidth: d.gutters.offsetWidth,
            gutterLeft: left,
            gutterWidth: width,
            wrapperWidth: d.wrapper.clientWidth}
  }

  // Computes display.scroller.scrollLeft + display.gutters.offsetWidth,
  // but using getBoundingClientRect to get a sub-pixel-accurate
  // result.
  function compensateForHScroll(display) {
    return display.scroller.getBoundingClientRect().left - display.sizer.getBoundingClientRect().left
  }

  // Returns a function that estimates the height of a line, to use as
  // first approximation until the line becomes visible (and is thus
  // properly measurable).
  function estimateHeight(cm) {
    var th = textHeight(cm.display), wrapping = cm.options.lineWrapping;
    var perLine = wrapping && Math.max(5, cm.display.scroller.clientWidth / charWidth(cm.display) - 3);
    return function (line) {
      if (lineIsHidden(cm.doc, line)) { return 0 }

      var widgetsHeight = 0;
      if (line.widgets) { for (var i = 0; i < line.widgets.length; i++) {
        if (line.widgets[i].height) { widgetsHeight += line.widgets[i].height; }
      } }

      if (wrapping)
        { return widgetsHeight + (Math.ceil(line.text.length / perLine) || 1) * th }
      else
        { return widgetsHeight + th }
    }
  }

  function estimateLineHeights(cm) {
    var doc = cm.doc, est = estimateHeight(cm);
    doc.iter(function (line) {
      var estHeight = est(line);
      if (estHeight != line.height) { updateLineHeight(line, estHeight); }
    });
  }

  // Given a mouse event, find the corresponding position. If liberal
  // is false, it checks whether a gutter or scrollbar was clicked,
  // and returns null if it was. forRect is used by rectangular
  // selections, and tries to estimate a character position even for
  // coordinates beyond the right of the text.
  function posFromMouse(cm, e, liberal, forRect) {
    var display = cm.display;
    if (!liberal && e_target(e).getAttribute("cm-not-content") == "true") { return null }

    var x, y, space = display.lineSpace.getBoundingClientRect();
    // Fails unpredictably on IE[67] when mouse is dragged around quickly.
    try { x = e.clientX - space.left; y = e.clientY - space.top; }
    catch (e) { return null }
    var coords = coordsChar(cm, x, y), line;
    if (forRect && coords.xRel > 0 && (line = getLine(cm.doc, coords.line).text).length == coords.ch) {
      var colDiff = countColumn(line, line.length, cm.options.tabSize) - line.length;
      coords = Pos(coords.line, Math.max(0, Math.round((x - paddingH(cm.display).left) / charWidth(cm.display)) - colDiff));
    }
    return coords
  }

  // Find the view element corresponding to a given line. Return null
  // when the line isn't visible.
  function findViewIndex(cm, n) {
    if (n >= cm.display.viewTo) { return null }
    n -= cm.display.viewFrom;
    if (n < 0) { return null }
    var view = cm.display.view;
    for (var i = 0; i < view.length; i++) {
      n -= view[i].size;
      if (n < 0) { return i }
    }
  }

  // Updates the display.view data structure for a given change to the
  // document. From and to are in pre-change coordinates. Lendiff is
  // the amount of lines added or subtracted by the change. This is
  // used for changes that span multiple lines, or change the way
  // lines are divided into visual lines. regLineChange (below)
  // registers single-line changes.
  function regChange(cm, from, to, lendiff) {
    if (from == null) { from = cm.doc.first; }
    if (to == null) { to = cm.doc.first + cm.doc.size; }
    if (!lendiff) { lendiff = 0; }

    var display = cm.display;
    if (lendiff && to < display.viewTo &&
        (display.updateLineNumbers == null || display.updateLineNumbers > from))
      { display.updateLineNumbers = from; }

    cm.curOp.viewChanged = true;

    if (from >= display.viewTo) { // Change after
      if (sawCollapsedSpans && visualLineNo(cm.doc, from) < display.viewTo)
        { resetView(cm); }
    } else if (to <= display.viewFrom) { // Change before
      if (sawCollapsedSpans && visualLineEndNo(cm.doc, to + lendiff) > display.viewFrom) {
        resetView(cm);
      } else {
        display.viewFrom += lendiff;
        display.viewTo += lendiff;
      }
    } else if (from <= display.viewFrom && to >= display.viewTo) { // Full overlap
      resetView(cm);
    } else if (from <= display.viewFrom) { // Top overlap
      var cut = viewCuttingPoint(cm, to, to + lendiff, 1);
      if (cut) {
        display.view = display.view.slice(cut.index);
        display.viewFrom = cut.lineN;
        display.viewTo += lendiff;
      } else {
        resetView(cm);
      }
    } else if (to >= display.viewTo) { // Bottom overlap
      var cut$1 = viewCuttingPoint(cm, from, from, -1);
      if (cut$1) {
        display.view = display.view.slice(0, cut$1.index);
        display.viewTo = cut$1.lineN;
      } else {
        resetView(cm);
      }
    } else { // Gap in the middle
      var cutTop = viewCuttingPoint(cm, from, from, -1);
      var cutBot = viewCuttingPoint(cm, to, to + lendiff, 1);
      if (cutTop && cutBot) {
        display.view = display.view.slice(0, cutTop.index)
          .concat(buildViewArray(cm, cutTop.lineN, cutBot.lineN))
          .concat(display.view.slice(cutBot.index));
        display.viewTo += lendiff;
      } else {
        resetView(cm);
      }
    }

    var ext = display.externalMeasured;
    if (ext) {
      if (to < ext.lineN)
        { ext.lineN += lendiff; }
      else if (from < ext.lineN + ext.size)
        { display.externalMeasured = null; }
    }
  }

  // Register a change to a single line. Type must be one of "text",
  // "gutter", "class", "widget"
  function regLineChange(cm, line, type) {
    cm.curOp.viewChanged = true;
    var display = cm.display, ext = cm.display.externalMeasured;
    if (ext && line >= ext.lineN && line < ext.lineN + ext.size)
      { display.externalMeasured = null; }

    if (line < display.viewFrom || line >= display.viewTo) { return }
    var lineView = display.view[findViewIndex(cm, line)];
    if (lineView.node == null) { return }
    var arr = lineView.changes || (lineView.changes = []);
    if (indexOf(arr, type) == -1) { arr.push(type); }
  }

  // Clear the view.
  function resetView(cm) {
    cm.display.viewFrom = cm.display.viewTo = cm.doc.first;
    cm.display.view = [];
    cm.display.viewOffset = 0;
  }

  function viewCuttingPoint(cm, oldN, newN, dir) {
    var index = findViewIndex(cm, oldN), diff, view = cm.display.view;
    if (!sawCollapsedSpans || newN == cm.doc.first + cm.doc.size)
      { return {index: index, lineN: newN} }
    var n = cm.display.viewFrom;
    for (var i = 0; i < index; i++)
      { n += view[i].size; }
    if (n != oldN) {
      if (dir > 0) {
        if (index == view.length - 1) { return null }
        diff = (n + view[index].size) - oldN;
        index++;
      } else {
        diff = n - oldN;
      }
      oldN += diff; newN += diff;
    }
    while (visualLineNo(cm.doc, newN) != newN) {
      if (index == (dir < 0 ? 0 : view.length - 1)) { return null }
      newN += dir * view[index - (dir < 0 ? 1 : 0)].size;
      index += dir;
    }
    return {index: index, lineN: newN}
  }

  // Force the view to cover a given range, adding empty view element
  // or clipping off existing ones as needed.
  function adjustView(cm, from, to) {
    var display = cm.display, view = display.view;
    if (view.length == 0 || from >= display.viewTo || to <= display.viewFrom) {
      display.view = buildViewArray(cm, from, to);
      display.viewFrom = from;
    } else {
      if (display.viewFrom > from)
        { display.view = buildViewArray(cm, from, display.viewFrom).concat(display.view); }
      else if (display.viewFrom < from)
        { display.view = display.view.slice(findViewIndex(cm, from)); }
      display.viewFrom = from;
      if (display.viewTo < to)
        { display.view = display.view.concat(buildViewArray(cm, display.viewTo, to)); }
      else if (display.viewTo > to)
        { display.view = display.view.slice(0, findViewIndex(cm, to)); }
    }
    display.viewTo = to;
  }

  // Count the number of lines in the view whose DOM representation is
  // out of date (or nonexistent).
  function countDirtyView(cm) {
    var view = cm.display.view, dirty = 0;
    for (var i = 0; i < view.length; i++) {
      var lineView = view[i];
      if (!lineView.hidden && (!lineView.node || lineView.changes)) { ++dirty; }
    }
    return dirty
  }

  function updateSelection(cm) {
    cm.display.input.showSelection(cm.display.input.prepareSelection());
  }

  function prepareSelection(cm, primary) {
    if ( primary === void 0 ) primary = true;

    var doc = cm.doc, result = {};
    var curFragment = result.cursors = document.createDocumentFragment();
    var selFragment = result.selection = document.createDocumentFragment();

    for (var i = 0; i < doc.sel.ranges.length; i++) {
      if (!primary && i == doc.sel.primIndex) { continue }
      var range = doc.sel.ranges[i];
      if (range.from().line >= cm.display.viewTo || range.to().line < cm.display.viewFrom) { continue }
      var collapsed = range.empty();
      if (collapsed || cm.options.showCursorWhenSelecting)
        { drawSelectionCursor(cm, range.head, curFragment); }
      if (!collapsed)
        { drawSelectionRange(cm, range, selFragment); }
    }
    return result
  }

  // Draws a cursor for the given range
  function drawSelectionCursor(cm, head, output) {
    var pos = cursorCoords(cm, head, "div", null, null, !cm.options.singleCursorHeightPerLine);

    var cursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor"));
    cursor.style.left = pos.left + "px";
    cursor.style.top = pos.top + "px";
    cursor.style.height = Math.max(0, pos.bottom - pos.top) * cm.options.cursorHeight + "px";

    if (pos.other) {
      // Secondary cursor, shown when on a 'jump' in bi-directional text
      var otherCursor = output.appendChild(elt("div", "\u00a0", "CodeMirror-cursor CodeMirror-secondarycursor"));
      otherCursor.style.display = "";
      otherCursor.style.left = pos.other.left + "px";
      otherCursor.style.top = pos.other.top + "px";
      otherCursor.style.height = (pos.other.bottom - pos.other.top) * .85 + "px";
    }
  }

  function cmpCoords(a, b) { return a.top - b.top || a.left - b.left }

  // Draws the given range as a highlighted selection
  function drawSelectionRange(cm, range, output) {
    var display = cm.display, doc = cm.doc;
    var fragment = document.createDocumentFragment();
    var padding = paddingH(cm.display), leftSide = padding.left;
    var rightSide = Math.max(display.sizerWidth, displayWidth(cm) - display.sizer.offsetLeft) - padding.right;
    var docLTR = doc.direction == "ltr";

    function add(left, top, width, bottom) {
      if (top < 0) { top = 0; }
      top = Math.round(top);
      bottom = Math.round(bottom);
      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")));
    }

    function drawForLine(line, fromArg, toArg) {
      var lineObj = getLine(doc, line);
      var lineLen = lineObj.text.length;
      var start, end;
      function coords(ch, bias) {
        return charCoords(cm, Pos(line, ch), "div", lineObj, bias)
      }

      function wrapX(pos, dir, side) {
        var extent = wrappedLineExtentChar(cm, lineObj, null, pos);
        var prop = (dir == "ltr") == (side == "after") ? "left" : "right";
        var ch = side == "after" ? extent.begin : extent.end - (/\s/.test(lineObj.text.charAt(extent.end - 1)) ? 2 : 1);
        return coords(ch, prop)[prop]
      }

      var order = getOrder(lineObj, doc.direction);
      iterateBidiSections(order, fromArg || 0, toArg == null ? lineLen : toArg, function (from, to, dir, i) {
        var ltr = dir == "ltr";
        var fromPos = coords(from, ltr ? "left" : "right");
        var toPos = coords(to - 1, ltr ? "right" : "left");

        var openStart = fromArg == null && from == 0, openEnd = toArg == null && to == lineLen;
        var first = i == 0, last = !order || i == order.length - 1;
        if (toPos.top - fromPos.top <= 3) { // Single line
          var openLeft = (docLTR ? openStart : openEnd) && first;
          var openRight = (docLTR ? openEnd : openStart) && last;
          var left = openLeft ? leftSide : (ltr ? fromPos : toPos).left;
          var right = openRight ? rightSide : (ltr ? toPos : fromPos).right;
          add(left, fromPos.top, right - left, fromPos.bottom);
        } else { // Multiple lines
          var topLeft, topRight, botLeft, botRight;
          if (ltr) {
            topLeft = docLTR && openStart && first ? leftSide : fromPos.left;
            topRight = docLTR ? rightSide : wrapX(from, dir, "before");
            botLeft = docLTR ? leftSide : wrapX(to, dir, "after");
            botRight = docLTR && openEnd && last ? rightSide : toPos.right;
          } else {
            topLeft = !docLTR ? leftSide : wrapX(from, dir, "before");
            topRight = !docLTR && openStart && first ? rightSide : fromPos.right;
            botLeft = !docLTR && openEnd && last ? leftSide : toPos.left;
            botRight = !docLTR ? rightSide : wrapX(to, dir, "after");
          }
          add(topLeft, fromPos.top, topRight - topLeft, fromPos.bottom);
          if (fromPos.bottom < toPos.top) { add(leftSide, fromPos.bottom, null, toPos.top); }
          add(botLeft, toPos.top, botRight - botLeft, toPos.bottom);
        }

        if (!start || cmpCoords(fromPos, start) < 0) { start = fromPos; }
        if (cmpCoords(toPos, start) < 0) { start = toPos; }
        if (!end || cmpCoords(fromPos, end) < 0) { end = fromPos; }
        if (cmpCoords(toPos, end) < 0) { end = toPos; }
      });
      return {start: start, end: end}
    }

    var sFrom = range.from(), sTo = range.to();
    if (sFrom.line == sTo.line) {
      drawForLine(sFrom.line, sFrom.ch, sTo.ch);
    } else {
      var fromLine = getLine(doc, sFrom.line), toLine = getLine(doc, sTo.line);
      var singleVLine = visualLine(fromLine) == visualLine(toLine);
      var leftEnd = drawForLine(sFrom.line, sFrom.ch, singleVLine ? fromLine.text.length + 1 : null).end;
      var rightStart = drawForLine(sTo.line, singleVLine ? 0 : null, sTo.ch).start;
      if (singleVLine) {
        if (leftEnd.top < rightStart.top - 2) {
          add(leftEnd.right, leftEnd.top, null, leftEnd.bottom);
          add(leftSide, rightStart.top, rightStart.left, rightStart.bottom);
        } else {
          add(leftEnd.right, leftEnd.top, rightStart.left - leftEnd.right, leftEnd.bottom);
        }
      }
      if (leftEnd.bottom < rightStart.top)
        { add(leftSide, leftEnd.bottom, null, rightStart.top); }
    }

    output.appendChild(fragment);
  }

  // Cursor-blinking
  function restartBlink(cm) {
    if (!cm.state.focused) { return }
    var display = cm.display;
    clearInterval(display.blinker);
    var on = true;
    display.cursorDiv.style.visibility = "";
    if (cm.options.cursorBlinkRate > 0)
      { display.blinker = setInterval(function () { return display.cursorDiv.style.visibility = (on = !on) ? "" : "hidden"; },
        cm.options.cursorBlinkRate); }
    else if (cm.options.cursorBlinkRate < 0)
      { display.cursorDiv.style.visibility = "hidden"; }
  }

  function ensureFocus(cm) {
    if (!cm.state.focused) { cm.display.input.focus(); onFocus(cm); }
  }

  function delayBlurEvent(cm) {
    cm.state.delayingBlurEvent = true;
    setTimeout(function () { if (cm.state.delayingBlurEvent) {
      cm.state.delayingBlurEvent = false;
      onBlur(cm);
    } }, 100);
  }

  function onFocus(cm, e) {
    if (cm.state.delayingBlurEvent) { cm.state.delayingBlurEvent = false; }

    if (cm.options.readOnly == "nocursor") { return }
    if (!cm.state.focused) {
      signal(cm, "focus", cm, e);
      cm.state.focused = true;
      addClass(cm.display.wrapper, "CodeMirror-focused");
      // This test prevents this from firing when a context
      // menu is closed (since the input reset would kill the
      // select-all detection hack)
      if (!cm.curOp && cm.display.selForContextMenu != cm.doc.sel) {
        cm.display.input.reset();
        if (webkit) { setTimeout(function () { return cm.display.input.reset(true); }, 20); } // Issue #1730
      }
      cm.display.input.receivedFocus();
    }
    restartBlink(cm);
  }
  function onBlur(cm, e) {
    if (cm.state.delayingBlurEvent) { return }

    if (cm.state.focused) {
      signal(cm, "blur", cm, e);
      cm.state.focused = false;
      rmClass(cm.display.wrapper, "CodeMirror-focused");
    }
    clearInterval(cm.display.blinker);
    setTimeout(function () { if (!cm.state.focused) { cm.display.shift = false; } }, 150);
  }

  // Read the actual heights of the rendered lines, and update their
  // stored heights to match.
  function updateHeightsInViewport(cm) {
    var display = cm.display;
    var prevBottom = display.lineDiv.offsetTop;
    for (var i = 0; i < display.view.length; i++) {
      var cur = display.view[i], wrapping = cm.options.lineWrapping;
      var height = (void 0), width = 0;
      if (cur.hidden) { continue }
      if (ie && ie_version < 8) {
        var bot = cur.node.offsetTop + cur.node.offsetHeight;
        height = bot - prevBottom;
        prevBottom = bot;
      } else {
        var box = cur.node.getBoundingClientRect();
        height = box.bottom - box.top;
        // Check that lines don't extend past the right of the current
        // editor width
        if (!wrapping && cur.text.firstChild)
          { width = cur.text.firstChild.getBoundingClientRect().right - box.left - 1; }
      }
      var diff = cur.line.height - height;
      if (diff > .005 || diff < -.005) {
        updateLineHeight(cur.line, height);
        updateWidgetHeight(cur.line);
        if (cur.rest) { for (var j = 0; j < cur.rest.length; j++)
          { updateWidgetHeight(cur.rest[j]); } }
      }
      if (width > cm.display.sizerWidth) {
        var chWidth = Math.ceil(width / charWidth(cm.display));
        if (chWidth > cm.display.maxLineLength) {
          cm.display.maxLineLength = chWidth;
          cm.display.maxLine = cur.line;
          cm.display.maxLineChanged = true;
        }
      }
    }
  }

  // Read and store the height of line widgets associated with the
  // given line.
  function updateWidgetHeight(line) {
    if (line.widgets) { for (var i = 0; i < line.widgets.length; ++i) {
      var w = line.widgets[i], parent = w.node.parentNode;
      if (parent) { w.height = parent.offsetHeight; }
    } }
  }

  // Compute the lines that are visible in a given viewport (defaults
  // the the current scroll position). viewport may contain top,
  // height, and ensure (see op.scrollToPos) properties.
  function visibleLines(display, doc, viewport) {
    var top = viewport && viewport.top != null ? Math.max(0, viewport.top) : display.scroller.scrollTop;
    top = Math.floor(top - paddingTop(display));
    var bottom = viewport && viewport.bottom != null ? viewport.bottom : top + display.wrapper.clientHeight;

    var from = lineAtHeight(doc, top), to = lineAtHeight(doc, bottom);
    // Ensure is a {from: {line, ch}, to: {line, ch}} object, and
    // forces those lines into the viewport (if possible).
    if (viewport && viewport.ensure) {
      var ensureFrom = viewport.ensure.from.line, ensureTo = viewport.ensure.to.line;
      if (ensureFrom < from) {
        from = ensureFrom;
        to = lineAtHeight(doc, heightAtLine(getLine(doc, ensureFrom)) + display.wrapper.clientHeight);
      } else if (Math.min(ensureTo, doc.lastLine()) >= to) {
        from = lineAtHeight(doc, heightAtLine(getLine(doc, ensureTo)) - display.wrapper.clientHeight);
        to = ensureTo;
      }
    }
    return {from: from, to: Math.max(to, from + 1)}
  }

  // SCROLLING THINGS INTO VIEW

  // If an editor sits on the top or bottom of the window, partially
  // scrolled out of view, this ensures that the cursor is visible.
  function maybeScrollWindow(cm, rect) {
    if (signalDOMEvent(cm, "scrollCursorIntoView")) { return }

    var display = cm.display, box = display.sizer.getBoundingClientRect(), doScroll = null;
    if (rect.top + box.top < 0) { doScroll = true; }
    else if (rect.bottom + box.top > (window.innerHeight || document.documentElement.clientHeight)) { doScroll = false; }
    if (doScroll != null && !phantom) {
      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;"));
      cm.display.lineSpace.appendChild(scrollNode);
      scrollNode.scrollIntoView(doScroll);
      cm.display.lineSpace.removeChild(scrollNode);
    }
  }

  // Scroll a given position into view (immediately), verifying that
  // it actually became visible (as line heights are accurately
  // measured, the position of something may 'drift' during drawing).
  function scrollPosIntoView(cm, pos, end, margin) {
    if (margin == null) { margin = 0; }
    var rect;
    if (!cm.options.lineWrapping && pos == end) {
      // Set pos and end to the cursor positions around the character pos sticks to
      // If pos.sticky == "before", that is around pos.ch - 1, otherwise around pos.ch
      // If pos == Pos(_, 0, "before"), pos and end are unchanged
      pos = pos.ch ? Pos(pos.line, pos.sticky == "before" ? pos.ch - 1 : pos.ch, "after") : pos;
      end = pos.sticky == "before" ? Pos(pos.line, pos.ch + 1, "before") : pos;
    }
    for (var limit = 0; limit < 5; limit++) {
      var changed = false;
      var coords = cursorCoords(cm, pos);
      var endCoords = !end || end == pos ? coords : cursorCoords(cm, end);
      rect = {left: Math.min(coords.left, endCoords.left),
              top: Math.min(coords.top, endCoords.top) - margin,
              right: Math.max(coords.left, endCoords.left),
              bottom: Math.max(coords.bottom, endCoords.bottom) + margin};
      var scrollPos = calculateScrollPos(cm, rect);
      var startTop = cm.doc.scrollTop, startLeft = cm.doc.scrollLeft;
      if (scrollPos.scrollTop != null) {
        updateScrollTop(cm, scrollPos.scrollTop);
        if (Math.abs(cm.doc.scrollTop - startTop) > 1) { changed = true; }
      }
      if (scrollPos.scrollLeft != null) {
        setScrollLeft(cm, scrollPos.scrollLeft);
        if (Math.abs(cm.doc.scrollLeft - startLeft) > 1) { changed = true; }
      }
      if (!changed) { break }
    }
    return rect
  }

  // Scroll a given set of coordinates into view (immediately).
  function scrollIntoView(cm, rect) {
    var scrollPos = calculateScrollPos(cm, rect);
    if (scrollPos.scrollTop != null) { updateScrollTop(cm, scrollPos.scrollTop); }
    if (scrollPos.scrollLeft != null) { setScrollLeft(cm, scrollPos.scrollLeft); }
  }

  // Calculate a new scroll position needed to scroll the given
  // rectangle into view. Returns an object with scrollTop and
  // scrollLeft properties. When these are undefined, the
  // vertical/horizontal position does not need to be adjusted.
  function calculateScrollPos(cm, rect) {
    var display = cm.display, snapMargin = textHeight(cm.display);
    if (rect.top < 0) { rect.top = 0; }
    var screentop = cm.curOp && cm.curOp.scrollTop != null ? cm.curOp.scrollTop : display.scroller.scrollTop;
    var screen = displayHeight(cm), result = {};
    if (rect.bottom - rect.top > screen) { rect.bottom = rect.top + screen; }
    var docBottom = cm.doc.height + paddingVert(display);
    var atTop = rect.top < snapMargin, atBottom = rect.bottom > docBottom - snapMargin;
    if (rect.top < screentop) {
      result.scrollTop = atTop ? 0 : rect.top;
    } else if (rect.bottom > screentop + screen) {
      var newTop = Math.min(rect.top, (atBottom ? docBottom : rect.bottom) - screen);
      if (newTop != screentop) { result.scrollTop = newTop; }
    }

    var screenleft = cm.curOp && cm.curOp.scrollLeft != null ? cm.curOp.scrollLeft : display.scroller.scrollLeft;
    var screenw = displayWidth(cm) - (cm.options.fixedGutter ? display.gutters.offsetWidth : 0);
    var tooWide = rect.right - rect.left > screenw;
    if (tooWide) { rect.right = rect.left + screenw; }
    if (rect.left < 10)
      { result.scrollLeft = 0; }
    else if (rect.left < screenleft)
      { result.scrollLeft = Math.max(0, rect.left - (tooWide ? 0 : 10)); }
    else if (rect.right > screenw + screenleft - 3)
      { result.scrollLeft = rect.right + (tooWide ? 0 : 10) - screenw; }
    return result
  }

  // Store a relative adjustment to the scroll position in the current
  // operation (to be applied when the operation finishes).
  function addToScrollTop(cm, top) {
    if (top == null) { return }
    resolveScrollToPos(cm);
    cm.curOp.scrollTop = (cm.curOp.scrollTop == null ? cm.doc.scrollTop : cm.curOp.scrollTop) + top;
  }

  // Make sure that at the end of the operation the current cursor is
  // shown.
  function ensureCursorVisible(cm) {
    resolveScrollToPos(cm);
    var cur = cm.getCursor();
    cm.curOp.scrollToPos = {from: cur, to: cur, margin: cm.options.cursorScrollMargin};
  }

  function scrollToCoords(cm, x, y) {
    if (x != null || y != null) { resolveScrollToPos(cm); }
    if (x != null) { cm.curOp.scrollLeft = x; }
    if (y != null) { cm.curOp.scrollTop = y; }
  }

  function scrollToRange(cm, range) {
    resolveScrollToPos(cm);
    cm.curOp.scrollToPos = range;
  }

  // When an operation has its scrollToPos property set, and another
  // scroll action is applied before the end of the operation, this
  // 'simulates' scrolling that position into view in a cheap way, so
  // that the effect of intermediate scroll commands is not ignored.
  function resolveScrollToPos(cm) {
    var range = cm.curOp.scrollToPos;
    if (range) {
      cm.curOp.scrollToPos = null;
      var from = estimateCoords(cm, range.from), to = estimateCoords(cm, range.to);
      scrollToCoordsRange(cm, from, to, range.margin);
    }
  }

  function scrollToCoordsRange(cm, from, to, margin) {
    var sPos = calculateScrollPos(cm, {
      left: Math.min(from.left, to.left),
      top: Math.min(from.top, to.top) - margin,
      right: Math.max(from.right, to.right),
      bottom: Math.max(from.bottom, to.bottom) + margin
    });
    scrollToCoords(cm, sPos.scrollLeft, sPos.scrollTop);
  }

  // Sync the scrollable area and scrollbars, ensure the viewport
  // covers the visible area.
  function updateScrollTop(cm, val) {
    if (Math.abs(cm.doc.scrollTop - val) < 2) { return }
    if (!gecko) { updateDisplaySimple(cm, {top: val}); }
    setScrollTop(cm, val, true);
    if (gecko) { updateDisplaySimple(cm); }
    startWorker(cm, 100);
  }

  function setScrollTop(cm, val, forceScroll) {
    val = Math.max(0, Math.min(cm.display.scroller.scrollHeight - cm.display.scroller.clientHeight, val));
    if (cm.display.scroller.scrollTop == val && !forceScroll) { return }
    cm.doc.scrollTop = val;
    cm.display.scrollbars.setScrollTop(val);
    if (cm.display.scroller.scrollTop != val) { cm.display.scroller.scrollTop = val; }
  }

  // Sync scroller and scrollbar, ensure the gutter elements are
  // aligned.
  function setScrollLeft(cm, val, isScroller, forceScroll) {
    val = Math.max(0, Math.min(val, cm.display.scroller.scrollWidth - cm.display.scroller.clientWidth));
    if ((isScroller ? val == cm.doc.scrollLeft : Math.abs(cm.doc.scrollLeft - val) < 2) && !forceScroll) { return }
    cm.doc.scrollLeft = val;
    alignHorizontally(cm);
    if (cm.display.scroller.scrollLeft != val) { cm.display.scroller.scrollLeft = val; }
    cm.display.scrollbars.setScrollLeft(val);
  }

  // SCROLLBARS

  // Prepare DOM reads needed to update the scrollbars. Done in one
  // shot to minimize update/measure roundtrips.
  function measureForScrollbars(cm) {
    var d = cm.display, gutterW = d.gutters.offsetWidth;
    var docH = Math.round(cm.doc.height + paddingVert(cm.display));
    return {
      clientHeight: d.scroller.clientHeight,
      viewHeight: d.wrapper.clientHeight,
      scrollWidth: d.scroller.scrollWidth, clientWidth: d.scroller.clientWidth,
      viewWidth: d.wrapper.clientWidth,
      barLeft: cm.options.fixedGutter ? gutterW : 0,
      docHeight: docH,
      scrollHeight: docH + scrollGap(cm) + d.barHeight,
      nativeBarWidth: d.nativeBarWidth,
      gutterWidth: gutterW
    }
  }

  var NativeScrollbars = function(place, scroll, cm) {
    this.cm = cm;
    var vert = this.vert = elt("div", [elt("div", null, null, "min-width: 1px")], "CodeMirror-vscrollbar");
    var horiz = this.horiz = elt("div", [elt("div", null, null, "height: 100%; min-height: 1px")], "CodeMirror-hscrollbar");
    vert.tabIndex = horiz.tabIndex = -1;
    place(vert); place(horiz);

    on(vert, "scroll", function () {
      if (vert.clientHeight) { scroll(vert.scrollTop, "vertical"); }
    });
    on(horiz, "scroll", function () {
      if (horiz.clientWidth) { scroll(horiz.scrollLeft, "horizontal"); }
    });

    this.checkedZeroWidth = false;
    // Need to set a minimum width to see the scrollbar on IE7 (but must not set it on IE8).
    if (ie && ie_version < 8) { this.horiz.style.minHeight = this.vert.style.minWidth = "18px"; }
  };

  NativeScrollbars.prototype.update = function (measure) {
    var needsH = measure.scrollWidth > measure.clientWidth + 1;
    var needsV = measure.scrollHeight > measure.clientHeight + 1;
    var sWidth = measure.nativeBarWidth;

    if (needsV) {
      this.vert.style.display = "block";
      this.vert.style.bottom = needsH ? sWidth + "px" : "0";
      var totalHeight = measure.viewHeight - (needsH ? sWidth : 0);
      // A bug in IE8 can cause this value to be negative, so guard it.
      this.vert.firstChild.style.height =
        Math.max(0, measure.scrollHeight - measure.clientHeight + totalHeight) + "px";
    } else {
      this.vert.style.display = "";
      this.vert.firstChild.style.height = "0";
    }

    if (needsH) {
      this.horiz.style.display = "block";
      this.horiz.style.right = needsV ? sWidth + "px" : "0";
      this.horiz.style.left = measure.barLeft + "px";
      var totalWidth = measure.viewWidth - measure.barLeft - (needsV ? sWidth : 0);
      this.horiz.firstChild.style.width =
        Math.max(0, measure.scrollWidth - measure.clientWidth + totalWidth) + "px";
    } else {
      this.horiz.style.display = "";
      this.horiz.firstChild.style.width = "0";
    }

    if (!this.checkedZeroWidth && measure.clientHeight > 0) {
      if (sWidth == 0) { this.zeroWidthHack(); }
      this.checkedZeroWidth = true;
    }

    return {right: needsV ? sWidth : 0, bottom: needsH ? sWidth : 0}
  };

  NativeScrollbars.prototype.setScrollLeft = function (pos) {
    if (this.horiz.scrollLeft != pos) { this.horiz.scrollLeft = pos; }
    if (this.disableHoriz) { this.enableZeroWidthBar(this.horiz, this.disableHoriz, "horiz"); }
  };

  NativeScrollbars.prototype.setScrollTop = function (pos) {
    if (this.vert.scrollTop != pos) { this.vert.scrollTop = pos; }
    if (this.disableVert) { this.enableZeroWidthBar(this.vert, this.disableVert, "vert"); }
  };

  NativeScrollbars.prototype.zeroWidthHack = function () {
    var w = mac && !mac_geMountainLion ? "12px" : "18px";
    this.horiz.style.height = this.vert.style.width = w;
    this.horiz.style.pointerEvents = this.vert.style.pointerEvents = "none";
    this.disableHoriz = new Delayed;
    this.disableVert = new Delayed;
  };

  NativeScrollbars.prototype.enableZeroWidthBar = function (bar, delay, type) {
    bar.style.pointerEvents = "auto";
    function maybeDisable() {
      // To find out whether the scrollbar is still visible, we
      // check whether the element under the pixel in the bottom
      // right corner of the scrollbar box is the scrollbar box
      // itself (when the bar is still visible) or its filler child
      // (when the bar is hidden). If it is still visible, we keep
      // it enabled, if it's hidden, we disable pointer events.
      var box = bar.getBoundingClientRect();
      var elt = type == "vert" ? document.elementFromPoint(box.right - 1, (box.top + box.bottom) / 2)
          : document.elementFromPoint((box.right + box.left) / 2, box.bottom - 1);
      if (elt != bar) { bar.style.pointerEvents = "none"; }
      else { delay.set(1000, maybeDisable); }
    }
    delay.set(1000, maybeDisable);
  };

  NativeScrollbars.prototype.clear = function () {
    var parent = this.horiz.parentNode;
    parent.removeChild(this.horiz);
    parent.removeChild(this.vert);
  };

  var NullScrollbars = function () {};

  NullScrollbars.prototype.update = function () { return {bottom: 0, right: 0} };
  NullScrollbars.prototype.setScrollLeft = function () {};
  NullScrollbars.prototype.setScrollTop = function () {};
  NullScrollbars.prototype.clear = function () {};

  function updateScrollbars(cm, measure) {
    if (!measure) { measure = measureForScrollbars(cm); }
    var startWidth = cm.display.barWidth, startHeight = cm.display.barHeight;
    updateScrollbarsInner(cm, measure);
    for (var i = 0; i < 4 && startWidth != cm.display.barWidth || startHeight != cm.display.barHeight; i++) {
      if (startWidth != cm.display.barWidth && cm.options.lineWrapping)
        { updateHeightsInViewport(cm); }
      updateScrollbarsInner(cm, measureForScrollbars(cm));
      startWidth = cm.display.barWidth; startHeight = cm.display.barHeight;
    }
  }

  // Re-synchronize the fake scrollbars with the actual size of the
  // content.
  function updateScrollbarsInner(cm, measure) {
    var d = cm.display;
    var sizes = d.scrollbars.update(measure);

    d.sizer.style.paddingRight = (d.barWidth = sizes.right) + "px";
    d.sizer.style.paddingBottom = (d.barHeight = sizes.bottom) + "px";
    d.heightForcer.style.borderBottom = sizes.bottom + "px solid transparent";

    if (sizes.right && sizes.bottom) {
      d.scrollbarFiller.style.display = "block";
      d.scrollbarFiller.style.height = sizes.bottom + "px";
      d.scrollbarFiller.style.width = sizes.right + "px";
    } else { d.scrollbarFiller.style.display = ""; }
    if (sizes.bottom && cm.options.coverGutterNextToScrollbar && cm.options.fixedGutter) {
      d.gutterFiller.style.display = "block";
      d.gutterFiller.style.height = sizes.bottom + "px";
      d.gutterFiller.style.width = measure.gutterWidth + "px";
    } else { d.gutterFiller.style.display = ""; }
  }

  var scrollbarModel = {"native": NativeScrollbars, "null": NullScrollbars};

  function initScrollbars(cm) {
    if (cm.display.scrollbars) {
      cm.display.scrollbars.clear();
      if (cm.display.scrollbars.addClass)
        { rmClass(cm.display.wrapper, cm.display.scrollbars.addClass); }
    }

    cm.display.scrollbars = new scrollbarModel[cm.options.scrollbarStyle](function (node) {
      cm.display.wrapper.insertBefore(node, cm.display.scrollbarFiller);
      // Prevent clicks in the scrollbars from killing focus
      on(node, "mousedown", function () {
        if (cm.state.focused) { setTimeout(function () { return cm.display.input.focus(); }, 0); }
      });
      node.setAttribute("cm-not-content", "true");
    }, function (pos, axis) {
      if (axis == "horizontal") { setScrollLeft(cm, pos); }
      else { updateScrollTop(cm, pos); }
    }, cm);
    if (cm.display.scrollbars.addClass)
      { addClass(cm.display.wrapper, cm.display.scrollbars.addClass); }
  }

  // Operations are used to wrap a series of changes to the editor
  // state in such a way that each change won't have to update the
  // cursor and display (which would be awkward, slow, and
  // error-prone). Instead, display updates are batched and then all
  // combined and executed at once.

  var nextOpId = 0;
  // Start a new operation.
  function startOperation(cm) {
    cm.curOp = {
      cm: cm,
      viewChanged: false,      // Flag that indicates that lines might need to be redrawn
      startHeight: cm.doc.height, // Used to detect need to update scrollbar
      forceUpdate: false,      // Used to force a redraw
      updateInput: 0,       // Whether to reset the input textarea
      typing: false,           // Whether this reset should be careful to leave existing text (for compositing)
      changeObjs: null,        // Accumulated changes, for firing change events
      cursorActivityHandlers: null, // Set of handlers to fire cursorActivity on
      cursorActivityCalled: 0, // Tracks which cursorActivity handlers have been called already
      selectionChanged: false, // Whether the selection needs to be redrawn
      updateMaxLine: false,    // Set when the widest line needs to be determined anew
      scrollLeft: null, scrollTop: null, // Intermediate scroll position, not pushed to DOM yet
      scrollToPos: null,       // Used to scroll to a specific position
      focus: false,
      id: ++nextOpId           // Unique ID
    };
    pushOperation(cm.curOp);
  }

  // Finish an operation, updating the display and signalling delayed events
  function endOperation(cm) {
    var op = cm.curOp;
    if (op) { finishOperation(op, function (group) {
      for (var i = 0; i < group.ops.length; i++)
        { group.ops[i].cm.curOp = null; }
      endOperations(group);
    }); }
  }

  // The DOM updates done when an operation finishes are batched so
  // that the minimum number of relayouts are required.
  function endOperations(group) {
    var ops = group.ops;
    for (var i = 0; i < ops.length; i++) // Read DOM
      { endOperation_R1(ops[i]); }
    for (var i$1 = 0; i$1 < ops.length; i$1++) // Write DOM (maybe)
      { endOperation_W1(ops[i$1]); }
    for (var i$2 = 0; i$2 < ops.length; i$2++) // Read DOM
      { endOperation_R2(ops[i$2]); }
    for (var i$3 = 0; i$3 < ops.length; i$3++) // Write DOM (maybe)
      { endOperation_W2(ops[i$3]); }
    for (var i$4 = 0; i$4 < ops.length; i$4++) // Read DOM
      { endOperation_finish(ops[i$4]); }
  }

  function endOperation_R1(op) {
    var cm = op.cm, display = cm.display;
    maybeClipScrollbars(cm);
    if (op.updateMaxLine) { findMaxLine(cm); }

    op.mustUpdate = op.viewChanged || op.forceUpdate || op.scrollTop != null ||
      op.scrollToPos && (op.scrollToPos.from.line < display.viewFrom ||
                         op.scrollToPos.to.line >= display.viewTo) ||
      display.maxLineChanged && cm.options.lineWrapping;
    op.update = op.mustUpdate &&
      new DisplayUpdate(cm, op.mustUpdate && {top: op.scrollTop, ensure: op.scrollToPos}, op.forceUpdate);
  }

  function endOperation_W1(op) {
    op.updatedDisplay = op.mustUpdate && updateDisplayIfNeeded(op.cm, op.update);
  }

  function endOperation_R2(op) {
    var cm = op.cm, display = cm.display;
    if (op.updatedDisplay) { updateHeightsInViewport(cm); }

    op.barMeasure = measureForScrollbars(cm);

    // If the max line changed since it was last measured, measure it,
    // and ensure the document's width matches it.
    // updateDisplay_W2 will use these properties to do the actual resizing
    if (display.maxLineChanged && !cm.options.lineWrapping) {
      op.adjustWidthTo = measureChar(cm, display.maxLine, display.maxLine.text.length).left + 3;
      cm.display.sizerWidth = op.adjustWidthTo;
      op.barMeasure.scrollWidth =
        Math.max(display.scroller.clientWidth, display.sizer.offsetLeft + op.adjustWidthTo + scrollGap(cm) + cm.display.barWidth);
      op.maxScrollLeft = Math.max(0, display.sizer.offsetLeft + op.adjustWidthTo - displayWidth(cm));
    }

    if (op.updatedDisplay || op.selectionChanged)
      { op.preparedSelection = display.input.prepareSelection(); }
  }

  function endOperation_W2(op) {
    var cm = op.cm;

    if (op.adjustWidthTo != null) {
      cm.display.sizer.style.minWidth = op.adjustWidthTo + "px";
      if (op.maxScrollLeft < cm.doc.scrollLeft)
        { setScrollLeft(cm, Math.min(cm.display.scroller.scrollLeft, op.maxScrollLeft), true); }
      cm.display.maxLineChanged = false;
    }

    var takeFocus = op.focus && op.focus == activeElt();
    if (op.preparedSelection)
      { cm.display.input.showSelection(op.preparedSelection, takeFocus); }
    if (op.updatedDisplay || op.startHeight != cm.doc.height)
      { updateScrollbars(cm, op.barMeasure); }
    if (op.updatedDisplay)
      { setDocumentHeight(cm, op.barMeasure); }

    if (op.selectionChanged) { restartBlink(cm); }

    if (cm.state.focused && op.updateInput)
      { cm.display.input.reset(op.typing); }
    if (takeFocus) { ensureFocus(op.cm); }
  }

  function endOperation_finish(op) {
    var cm = op.cm, display = cm.display, doc = cm.doc;

    if (op.updatedDisplay) { postUpdateDisplay(cm, op.update); }

    // Abort mouse wheel delta measurement, when scrolling explicitly
    if (display.wheelStartX != null && (op.scrollTop != null || op.scrollLeft != null || op.scrollToPos))
      { display.wheelStartX = display.wheelStartY = null; }

    // Propagate the scroll position to the actual DOM scroller
    if (op.scrollTop != null) { setScrollTop(cm, op.scrollTop, op.forceScroll); }

    if (op.scrollLeft != null) { setScrollLeft(cm, op.scrollLeft, true, true); }
    // If we need to scroll a specific position into view, do so.
    if (op.scrollToPos) {
      var rect = scrollPosIntoView(cm, clipPos(doc, op.scrollToPos.from),
                                   clipPos(doc, op.scrollToPos.to), op.scrollToPos.margin);
      maybeScrollWindow(cm, rect);
    }

    // Fire events for markers that are hidden/unidden by editing or
    // undoing
    var hidden = op.maybeHiddenMarkers, unhidden = op.maybeUnhiddenMarkers;
    if (hidden) { for (var i = 0; i < hidden.length; ++i)
      { if (!hidden[i].lines.length) { signal(hidden[i], "hide"); } } }
    if (unhidden) { for (var i$1 = 0; i$1 < unhidden.length; ++i$1)
      { if (unhidden[i$1].lines.length) { signal(unhidden[i$1], "unhide"); } } }

    if (display.wrapper.offsetHeight)
      { doc.scrollTop = cm.display.scroller.scrollTop; }

    // Fire change events, and delayed event handlers
    if (op.changeObjs)
      { signal(cm, "changes", cm, op.changeObjs); }
    if (op.update)
      { op.update.finish(); }
  }

  // Run the given function in an operation
  function runInOp(cm, f) {
    if (cm.curOp) { return f() }
    startOperation(cm);
    try { return f() }
    finally { endOperation(cm); }
  }
  // Wraps a function in an operation. Returns the wrapped function.
  function operation(cm, f) {
    return function() {
      if (cm.curOp) { return f.apply(cm, arguments) }
      startOperation(cm);
      try { return f.apply(cm, arguments) }
      finally { endOperation(cm); }
    }
  }
  // Used to add methods to editor and doc instances, wrapping them in
  // operations.
  function methodOp(f) {
    return function() {
      if (this.curOp) { return f.apply(this, arguments) }
      startOperation(this);
      try { return f.apply(this, arguments) }
      finally { endOperation(this); }
    }
  }
  function docMethodOp(f) {
    return function() {
      var cm = this.cm;
      if (!cm || cm.curOp) { return f.apply(this, arguments) }
      startOperation(cm);
      try { return f.apply(this, arguments) }
      finally { endOperation(cm); }
    }
  }

  // HIGHLIGHT WORKER

  function startWorker(cm, time) {
    if (cm.doc.highlightFrontier < cm.display.viewTo)
      { cm.state.highlight.set(time, bind(highlightWorker, cm)); }
  }

  function highlightWorker(cm) {
    var doc = cm.doc;
    if (doc.highlightFrontier >= cm.display.viewTo) { return }
    var end = +new Date + cm.options.workTime;
    var context = getContextBefore(cm, doc.highlightFrontier);
    var changedLines = [];

    doc.iter(context.line, Math.min(doc.first + doc.size, cm.display.viewTo + 500), function (line) {
      if (context.line >= cm.display.viewFrom) { // Visible
        var oldStyles = line.styles;
        var resetState = line.text.length > cm.options.maxHighlightLength ? copyState(doc.mode, context.state) : null;
        var highlighted = highlightLine(cm, line, context, true);
        if (resetState) { context.state = resetState; }
        line.styles = highlighted.styles;
        var oldCls = line.styleClasses, newCls = highlighted.classes;
        if (newCls) { line.styleClasses = newCls; }
        else if (oldCls) { line.styleClasses = null; }
        var ischange = !oldStyles || oldStyles.length != line.styles.length ||
          oldCls != newCls && (!oldCls || !newCls || oldCls.bgClass != newCls.bgClass || oldCls.textClass != newCls.textClass);
        for (var i = 0; !ischange && i < oldStyles.length; ++i) { ischange = oldStyles[i] != line.styles[i]; }
        if (ischange) { changedLines.push(context.line); }
        line.stateAfter = context.save();
        context.nextLine();
      } else {
        if (line.text.length <= cm.options.maxHighlightLength)
          { processLine(cm, line.text, context); }
        line.stateAfter = context.line % 5 == 0 ? context.save() : null;
        context.nextLine();
      }
      if (+new Date > end) {
        startWorker(cm, cm.options.workDelay);
        return true
      }
    });
    doc.highlightFrontier = context.line;
    doc.modeFrontier = Math.max(doc.modeFrontier, context.line);
    if (changedLines.length) { runInOp(cm, function () {
      for (var i = 0; i < changedLines.length; i++)
        { regLineChange(cm, changedLines[i], "text"); }
    }); }
  }

  // DISPLAY DRAWING

  var DisplayUpdate = function(cm, viewport, force) {
    var display = cm.display;

    this.viewport = viewport;
    // Store some values that we'll need later (but don't want to force a relayout for)
    this.visible = visibleLines(display, cm.doc, viewport);
    this.editorIsHidden = !display.wrapper.offsetWidth;
    this.wrapperHeight = display.wrapper.clientHeight;
    this.wrapperWidth = display.wrapper.clientWidth;
    this.oldDisplayWidth = displayWidth(cm);
    this.force = force;
    this.dims = getDimensions(cm);
    this.events = [];
  };

  DisplayUpdate.prototype.signal = function (emitter, type) {
    if (hasHandler(emitter, type))
      { this.events.push(arguments); }
  };
  DisplayUpdate.prototype.finish = function () {
    for (var i = 0; i < this.events.length; i++)
      { signal.apply(null, this.events[i]); }
  };

  function maybeClipScrollbars(cm) {
    var display = cm.display;
    if (!display.scrollbarsClipped && display.scroller.offsetWidth) {
      display.nativeBarWidth = display.scroller.offsetWidth - display.scroller.clientWidth;
      display.heightForcer.style.height = scrollGap(cm) + "px";
      display.sizer.style.marginBottom = -display.nativeBarWidth + "px";
      display.sizer.style.borderRightWidth = scrollGap(cm) + "px";
      display.scrollbarsClipped = true;
    }
  }

  function selectionSnapshot(cm) {
    if (cm.hasFocus()) { return null }
    var active = activeElt();
    if (!active || !contains(cm.display.lineDiv, active)) { return null }
    var result = {activeElt: active};
    if (window.getSelection) {
      var sel = window.getSelection();
      if (sel.anchorNode && sel.extend && contains(cm.display.lineDiv, sel.anchorNode)) {
        result.anchorNode = sel.anchorNode;
        result.anchorOffset = sel.anchorOffset;
        result.focusNode = sel.focusNode;
        result.focusOffset = sel.focusOffset;
      }
    }
    return result
  }

  function restoreSelection(snapshot) {
    if (!snapshot || !snapshot.activeElt || snapshot.activeElt == activeElt()) { return }
    snapshot.activeElt.focus();
    if (!/^(INPUT|TEXTAREA)$/.test(snapshot.activeElt.nodeName) &&
        snapshot.anchorNode && contains(document.body, snapshot.anchorNode) && contains(document.body, snapshot.focusNode)) {
      var sel = window.getSelection(), range = document.createRange();
      range.setEnd(snapshot.anchorNode, snapshot.anchorOffset);
      range.collapse(false);
      sel.removeAllRanges();
      sel.addRange(range);
      sel.extend(snapshot.focusNode, snapshot.focusOffset);
    }
  }

  // Does the actual updating of the line display. Bails out
  // (returning false) when there is nothing to be done and forced is
  // false.
  function updateDisplayIfNeeded(cm, update) {
    var display = cm.display, doc = cm.doc;

    if (update.editorIsHidden) {
      resetView(cm);
      return false
    }

    // Bail out if the visible area is already rendered and nothing changed.
    if (!update.force &&
        update.visible.from >= display.viewFrom && update.visible.to <= display.viewTo &&
        (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo) &&
        display.renderedView == display.view && countDirtyView(cm) == 0)
      { return false }

    if (maybeUpdateLineNumberWidth(cm)) {
      resetView(cm);
      update.dims = getDimensions(cm);
    }

    // Compute a suitable new viewport (from & to)
    var end = doc.first + doc.size;
    var from = Math.max(update.visible.from - cm.options.viewportMargin, doc.first);
    var to = Math.min(end, update.visible.to + cm.options.viewportMargin);
    if (display.viewFrom < from && from - display.viewFrom < 20) { from = Math.max(doc.first, display.viewFrom); }
    if (display.viewTo > to && display.viewTo - to < 20) { to = Math.min(end, display.viewTo); }
    if (sawCollapsedSpans) {
      from = visualLineNo(cm.doc, from);
      to = visualLineEndNo(cm.doc, to);
    }

    var different = from != display.viewFrom || to != display.viewTo ||
      display.lastWrapHeight != update.wrapperHeight || display.lastWrapWidth != update.wrapperWidth;
    adjustView(cm, from, to);

    display.viewOffset = heightAtLine(getLine(cm.doc, display.viewFrom));
    // Position the mover div to align with the current scroll position
    cm.display.mover.style.top = display.viewOffset + "px";

    var toUpdate = countDirtyView(cm);
    if (!different && toUpdate == 0 && !update.force && display.renderedView == display.view &&
        (display.updateLineNumbers == null || display.updateLineNumbers >= display.viewTo))
      { return false }

    // For big changes, we hide the enclosing element during the
    // update, since that speeds up the operations on most browsers.
    var selSnapshot = selectionSnapshot(cm);
    if (toUpdate > 4) { display.lineDiv.style.display = "none"; }
    patchDisplay(cm, display.updateLineNumbers, update.dims);
    if (toUpdate > 4) { display.lineDiv.style.display = ""; }
    display.renderedView = display.view;
    // There might have been a widget with a focused element that got
    // hidden or updated, if so re-focus it.
    restoreSelection(selSnapshot);

    // Prevent selection and cursors from interfering with the scroll
    // width and height.
    removeChildren(display.cursorDiv);
    removeChildren(display.selectionDiv);
    display.gutters.style.height = display.sizer.style.minHeight = 0;

    if (different) {
      display.lastWrapHeight = update.wrapperHeight;
      display.lastWrapWidth = update.wrapperWidth;
      startWorker(cm, 400);
    }

    display.updateLineNumbers = null;

    return true
  }

  function postUpdateDisplay(cm, update) {
    var viewport = update.viewport;

    for (var first = true;; first = false) {
      if (!first || !cm.options.lineWrapping || update.oldDisplayWidth == displayWidth(cm)) {
        // Clip forced viewport to actual scrollable area.
        if (viewport && viewport.top != null)
          { viewport = {top: Math.min(cm.doc.height + paddingVert(cm.display) - displayHeight(cm), viewport.top)}; }
        // Updated line heights might result in the drawn area not
        // actually covering the viewport. Keep looping until it does.
        update.visible = visibleLines(cm.display, cm.doc, viewport);
        if (update.visible.from >= cm.display.viewFrom && update.visible.to <= cm.display.viewTo)
          { break }
      } else if (first) {
        update.visible = visibleLines(cm.display, cm.doc, viewport);
      }
      if (!updateDisplayIfNeeded(cm, update)) { break }
      updateHeightsInViewport(cm);
      var barMeasure = measureForScrollbars(cm);
      updateSelection(cm);
      updateScrollbars(cm, barMeasure);
      setDocumentHeight(cm, barMeasure);
      update.force = false;
    }

    update.signal(cm, "update", cm);
    if (cm.display.viewFrom != cm.display.reportedViewFrom || cm.display.viewTo != cm.display.reportedViewTo) {
      update.signal(cm, "viewportChange", cm, cm.display.viewFrom, cm.display.viewTo);
      cm.display.reportedViewFrom = cm.display.viewFrom; cm.display.reportedViewTo = cm.display.viewTo;
    }
  }

  function updateDisplaySimple(cm, viewport) {
    var update = new DisplayUpdate(cm, viewport);
    if (updateDisplayIfNeeded(cm, update)) {
      updateHeightsInViewport(cm);
      postUpdateDisplay(cm, update);
      var barMeasure = measureForScrollbars(cm);
      updateSelection(cm);
      updateScrollbars(cm, barMeasure);
      setDocumentHeight(cm, barMeasure);
      update.finish();
    }
  }

  // Sync the actual display DOM structure with display.view, removing
  // nodes for lines that are no longer in view, and creating the ones
  // that are not there yet, and updating the ones that are out of
  // date.
  function patchDisplay(cm, updateNumbersFrom, dims) {
    var display = cm.display, lineNumbers = cm.options.lineNumbers;
    var container = display.lineDiv, cur = container.firstChild;

    function rm(node) {
      var next = node.nextSibling;
      // Works around a throw-scroll bug in OS X Webkit
      if (webkit && mac && cm.display.currentWheelTarget == node)
        { node.style.display = "none"; }
      else
        { node.parentNode.removeChild(node); }
      return next
    }

    var view = display.view, lineN = display.viewFrom;
    // Loop over the elements in the view, syncing cur (the DOM nodes
    // in display.lineDiv) with the view as we go.
    for (var i = 0; i < view.length; i++) {
      var lineView = view[i];
      if (lineView.hidden) ; else if (!lineView.node || lineView.node.parentNode != container) { // Not drawn yet
        var node = buildLineElement(cm, lineView, lineN, dims);
        container.insertBefore(node, cur);
      } else { // Already drawn
        while (cur != lineView.node) { cur = rm(cur); }
        var updateNumber = lineNumbers && updateNumbersFrom != null &&
          updateNumbersFrom <= lineN && lineView.lineNumber;
        if (lineView.changes) {
          if (indexOf(lineView.changes, "gutter") > -1) { updateNumber = false; }
          updateLineForChanges(cm, lineView, lineN, dims);
        }
        if (updateNumber) {
          removeChildren(lineView.lineNumber);
          lineView.lineNumber.appendChild(document.createTextNode(lineNumberFor(cm.options, lineN)));
        }
        cur = lineView.node.nextSibling;
      }
      lineN += lineView.size;
    }
    while (cur) { cur = rm(cur); }
  }

  function updateGutterSpace(display) {
    var width = display.gutters.offsetWidth;
    display.sizer.style.marginLeft = width + "px";
  }

  function setDocumentHeight(cm, measure) {
    cm.display.sizer.style.minHeight = measure.docHeight + "px";
    cm.display.heightForcer.style.top = measure.docHeight + "px";
    cm.display.gutters.style.height = (measure.docHeight + cm.display.barHeight + scrollGap(cm)) + "px";
  }

  // Re-align line numbers and gutter marks to compensate for
  // horizontal scrolling.
  function alignHorizontally(cm) {
    var display = cm.display, view = display.view;
    if (!display.alignWidgets && (!display.gutters.firstChild || !cm.options.fixedGutter)) { return }
    var comp = compensateForHScroll(display) - display.scroller.scrollLeft + cm.doc.scrollLeft;
    var gutterW = display.gutters.offsetWidth, left = comp + "px";
    for (var i = 0; i < view.length; i++) { if (!view[i].hidden) {
      if (cm.options.fixedGutter) {
        if (view[i].gutter)
          { view[i].gutter.style.left = left; }
        if (view[i].gutterBackground)
          { view[i].gutterBackground.style.left = left; }
      }
      var align = view[i].alignable;
      if (align) { for (var j = 0; j < align.length; j++)
        { align[j].style.left = left; } }
    } }
    if (cm.options.fixedGutter)
      { display.gutters.style.left = (comp + gutterW) + "px"; }
  }

  // Used to ensure that the line number gutter is still the right
  // size for the current document size. Returns true when an update
  // is needed.
  function maybeUpdateLineNumberWidth(cm) {
    if (!cm.options.lineNumbers) { return false }
    var doc = cm.doc, last = lineNumberFor(cm.options, doc.first + doc.size - 1), display = cm.display;
    if (last.length != display.lineNumChars) {
      var test = display.measure.appendChild(elt("div", [elt("div", last)],
                                                 "CodeMirror-linenumber CodeMirror-gutter-elt"));
      var innerW = test.firstChild.offsetWidth, padding = test.offsetWidth - innerW;
      display.lineGutter.style.width = "";
      display.lineNumInnerWidth = Math.max(innerW, display.lineGutter.offsetWidth - padding) + 1;
      display.lineNumWidth = display.lineNumInnerWidth + padding;
      display.lineNumChars = display.lineNumInnerWidth ? last.length : -1;
      display.lineGutter.style.width = display.lineNumWidth + "px";
      updateGutterSpace(cm.display);
      return true
    }
    return false
  }

  function getGutters(gutters, lineNumbers) {
    var result = [], sawLineNumbers = false;
    for (var i = 0; i < gutters.length; i++) {
      var name = gutters[i], style = null;
      if (typeof name != "string") { style = name.style; name = name.className; }
      if (name == "CodeMirror-linenumbers") {
        if (!lineNumbers) { continue }
        else { sawLineNumbers = true; }
      }
      result.push({className: name, style: style});
    }
    if (lineNumbers && !sawLineNumbers) { result.push({className: "CodeMirror-linenumbers", style: null}); }
    return result
  }

  // Rebuild the gutter elements, ensure the margin to the left of the
  // code matches their width.
  function renderGutters(display) {
    var gutters = display.gutters, specs = display.gutterSpecs;
    removeChildren(gutters);
    display.lineGutter = null;
    for (var i = 0; i < specs.length; ++i) {
      var ref = specs[i];
      var className = ref.className;
      var style = ref.style;
      var gElt = gutters.appendChild(elt("div", null, "CodeMirror-gutter " + className));
      if (style) { gElt.style.cssText = style; }
      if (className == "CodeMirror-linenumbers") {
        display.lineGutter = gElt;
        gElt.style.width = (display.lineNumWidth || 1) + "px";
      }
    }
    gutters.style.display = specs.length ? "" : "none";
    updateGutterSpace(display);
  }

  function updateGutters(cm) {
    renderGutters(cm.display);
    regChange(cm);
    alignHorizontally(cm);
  }

  // The display handles the DOM integration, both for input reading
  // and content drawing. It holds references to DOM nodes and
  // display-related state.

  function Display(place, doc, input, options) {
    var d = this;
    this.input = input;

    // Covers bottom-right square when both scrollbars are present.
    d.scrollbarFiller = elt("div", null, "CodeMirror-scrollbar-filler");
    d.scrollbarFiller.setAttribute("cm-not-content", "true");
    // Covers bottom of gutter when coverGutterNextToScrollbar is on
    // and h scrollbar is present.
    d.gutterFiller = elt("div", null, "CodeMirror-gutter-filler");
    d.gutterFiller.setAttribute("cm-not-content", "true");
    // Will contain the actual code, positioned to cover the viewport.
    d.lineDiv = eltP("div", null, "CodeMirror-code");
    // Elements are added to these to represent selection and cursors.
    d.selectionDiv = elt("div", null, null, "position: relative; z-index: 1");
    d.cursorDiv = elt("div", null, "CodeMirror-cursors");
    // A visibility: hidden element used to find the size of things.
    d.measure = elt("div", null, "CodeMirror-measure");
    // When lines outside of the viewport are measured, they are drawn in this.
    d.lineMeasure = elt("div", null, "CodeMirror-measure");
    // Wraps everything that needs to exist inside the vertically-padded coordinate system
    d.lineSpace = eltP("div", [d.measure, d.lineMeasure, d.selectionDiv, d.cursorDiv, d.lineDiv],
                      null, "position: relative; outline: none");
    var lines = eltP("div", [d.lineSpace], "CodeMirror-lines");
    // Moved around its parent to cover visible view.
    d.mover = elt("div", [lines], null, "position: relative");
    // Set to the height of the document, allowing scrolling.
    d.sizer = elt("div", [d.mover], "CodeMirror-sizer");
    d.sizerWidth = null;
    // Behavior of elts with overflow: auto and padding is
    // inconsistent across browsers. This is used to ensure the
    // scrollable area is big enough.
    d.heightForcer = elt("div", null, null, "position: absolute; height: " + scrollerGap + "px; width: 1px;");
    // Will contain the gutters, if any.
    d.gutters = elt("div", null, "CodeMirror-gutters");
    d.lineGutter = null;
    // Actual scrollable element.
    d.scroller = elt("div", [d.sizer, d.heightForcer, d.gutters], "CodeMirror-scroll");
    d.scroller.setAttribute("tabIndex", "-1");
    // The element in which the editor lives.
    d.wrapper = elt("div", [d.scrollbarFiller, d.gutterFiller, d.scroller], "CodeMirror");

    // Work around IE7 z-index bug (not perfect, hence IE7 not really being supported)
    if (ie && ie_version < 8) { d.gutters.style.zIndex = -1; d.scroller.style.paddingRight = 0; }
    if (!webkit && !(gecko && mobile)) { d.scroller.draggable = true; }

    if (place) {
      if (place.appendChild) { place.appendChild(d.wrapper); }
      else { place(d.wrapper); }
    }

    // Current rendered range (may be bigger than the view window).
    d.viewFrom = d.viewTo = doc.first;
    d.reportedViewFrom = d.reportedViewTo = doc.first;
    // Information about the rendered lines.
    d.view = [];
    d.renderedView = null;
    // Holds info about a single rendered line when it was rendered
    // for measurement, while not in view.
    d.externalMeasured = null;
    // Empty space (in pixels) above the view
    d.viewOffset = 0;
    d.lastWrapHeight = d.lastWrapWidth = 0;
    d.updateLineNumbers = null;

    d.nativeBarWidth = d.barHeight = d.barWidth = 0;
    d.scrollbarsClipped = false;

    // Used to only resize the line number gutter when necessary (when
    // the amount of lines crosses a boundary that makes its width change)
    d.lineNumWidth = d.lineNumInnerWidth = d.lineNumChars = null;
    // Set to true when a non-horizontal-scrolling line widget is
    // added. As an optimization, line widget aligning is skipped when
    // this is false.
    d.alignWidgets = false;

    d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;

    // Tracks the maximum line length so that the horizontal scrollbar
    // can be kept static when scrolling.
    d.maxLine = null;
    d.maxLineLength = 0;
    d.maxLineChanged = false;

    // Used for measuring wheel scrolling granularity
    d.wheelDX = d.wheelDY = d.wheelStartX = d.wheelStartY = null;

    // True when shift is held down.
    d.shift = false;

    // Used to track whether anything happened since the context menu
    // was opened.
    d.selForContextMenu = null;

    d.activeTouch = null;

    d.gutterSpecs = getGutters(options.gutters, options.lineNumbers);
    renderGutters(d);

    input.init(d);
  }

  // Since the delta values reported on mouse wheel events are
  // unstandardized between browsers and even browser versions, and
  // generally horribly unpredictable, this code starts by measuring
  // the scroll effect that the first few mouse wheel events have,
  // and, from that, detects the way it can convert deltas to pixel
  // offsets afterwards.
  //
  // The reason we want to know the amount a wheel event will scroll
  // is that it gives us a chance to update the display before the
  // actual scrolling happens, reducing flickering.

  var wheelSamples = 0, wheelPixelsPerUnit = null;
  // Fill in a browser-detected starting value on browsers where we
  // know one. These don't have to be accurate -- the result of them
  // being wrong would just be a slight flicker on the first wheel
  // scroll (if it is large enough).
  if (ie) { wheelPixelsPerUnit = -.53; }
  else if (gecko) { wheelPixelsPerUnit = 15; }
  else if (chrome) { wheelPixelsPerUnit = -.7; }
  else if (safari) { wheelPixelsPerUnit = -1/3; }

  function wheelEventDelta(e) {
    var dx = e.wheelDeltaX, dy = e.wheelDeltaY;
    if (dx == null && e.detail && e.axis == e.HORIZONTAL_AXIS) { dx = e.detail; }
    if (dy == null && e.detail && e.axis == e.VERTICAL_AXIS) { dy = e.detail; }
    else if (dy == null) { dy = e.wheelDelta; }
    return {x: dx, y: dy}
  }
  function wheelEventPixels(e) {
    var delta = wheelEventDelta(e);
    delta.x *= wheelPixelsPerUnit;
    delta.y *= wheelPixelsPerUnit;
    return delta
  }

  function onScrollWheel(cm, e) {
    var delta = wheelEventDelta(e), dx = delta.x, dy = delta.y;

    var display = cm.display, scroll = display.scroller;
    // Quit if there's nothing to scroll here
    var canScrollX = scroll.scrollWidth > scroll.clientWidth;
    var canScrollY = scroll.scrollHeight > scroll.clientHeight;
    if (!(dx && canScrollX || dy && canScrollY)) { return }

    // Webkit browsers on OS X abort momentum scrolls when the target
    // of the scroll event is removed from the scrollable element.
    // This hack (see related code in patchDisplay) makes sure the
    // element is kept around.
    if (dy && mac && webkit) {
      outer: for (var cur = e.target, view = display.view; cur != scroll; cur = cur.parentNode) {
        for (var i = 0; i < view.length; i++) {
          if (view[i].node == cur) {
            cm.display.currentWheelTarget = cur;
            break outer
          }
        }
      }
    }

    // On some browsers, horizontal scrolling will cause redraws to
    // happen before the gutter has been realigned, causing it to
    // wriggle around in a most unseemly way. When we have an
    // estimated pixels/delta value, we just handle horizontal
    // scrolling entirely here. It'll be slightly off from native, but
    // better than glitching out.
    if (dx && !gecko && !presto && wheelPixelsPerUnit != null) {
      if (dy && canScrollY)
        { updateScrollTop(cm, Math.max(0, scroll.scrollTop + dy * wheelPixelsPerUnit)); }
      setScrollLeft(cm, Math.max(0, scroll.scrollLeft + dx * wheelPixelsPerUnit));
      // Only prevent default scrolling if vertical scrolling is
      // actually possible. Otherwise, it causes vertical scroll
      // jitter on OSX trackpads when deltaX is small and deltaY
      // is large (issue #3579)
      if (!dy || (dy && canScrollY))
        { e_preventDefault(e); }
      display.wheelStartX = null; // Abort measurement, if in progress
      return
    }

    // 'Project' the visible viewport to cover the area that is being
    // scrolled into view (if we know enough to estimate it).
    if (dy && wheelPixelsPerUnit != null) {
      var pixels = dy * wheelPixelsPerUnit;
      var top = cm.doc.scrollTop, bot = top + display.wrapper.clientHeight;
      if (pixels < 0) { top = Math.max(0, top + pixels - 50); }
      else { bot = Math.min(cm.doc.height, bot + pixels + 50); }
      updateDisplaySimple(cm, {top: top, bottom: bot});
    }

    if (wheelSamples < 20) {
      if (display.wheelStartX == null) {
        display.wheelStartX = scroll.scrollLeft; display.wheelStartY = scroll.scrollTop;
        display.wheelDX = dx; display.wheelDY = dy;
        setTimeout(function () {
          if (display.wheelStartX == null) { return }
          var movedX = scroll.scrollLeft - display.wheelStartX;
          var movedY = scroll.scrollTop - display.wheelStartY;
          var sample = (movedY && display.wheelDY && movedY / display.wheelDY) ||
            (movedX && display.wheelDX && movedX / display.wheelDX);
          display.wheelStartX = display.wheelStartY = null;
          if (!sample) { return }
          wheelPixelsPerUnit = (wheelPixelsPerUnit * wheelSamples + sample) / (wheelSamples + 1);
          ++wheelSamples;
        }, 200);
      } else {
        display.wheelDX += dx; display.wheelDY += dy;
      }
    }
  }

  // Selection objects are immutable. A new one is created every time
  // the selection changes. A selection is one or more non-overlapping
  // (and non-touching) ranges, sorted, and an integer that indicates
  // which one is the primary selection (the one that's scrolled into
  // view, that getCursor returns, etc).
  var Selection = function(ranges, primIndex) {
    this.ranges = ranges;
    this.primIndex = primIndex;
  };

  Selection.prototype.primary = function () { return this.ranges[this.primIndex] };

  Selection.prototype.equals = function (other) {
    if (other == this) { return true }
    if (other.primIndex != this.primIndex || other.ranges.length != this.ranges.length) { return false }
    for (var i = 0; i < this.ranges.length; i++) {
      var here = this.ranges[i], there = other.ranges[i];
      if (!equalCursorPos(here.anchor, there.anchor) || !equalCursorPos(here.head, there.head)) { return false }
    }
    return true
  };

  Selection.prototype.deepCopy = function () {
    var out = [];
    for (var i = 0; i < this.ranges.length; i++)
      { out[i] = new Range(copyPos(this.ranges[i].anchor), copyPos(this.ranges[i].head)); }
    return new Selection(out, this.primIndex)
  };

  Selection.prototype.somethingSelected = function () {
    for (var i = 0; i < this.ranges.length; i++)
      { if (!this.ranges[i].empty()) { return true } }
    return false
  };

  Selection.prototype.contains = function (pos, end) {
    if (!end) { end = pos; }
    for (var i = 0; i < this.ranges.length; i++) {
      var range = this.ranges[i];
      if (cmp(end, range.from()) >= 0 && cmp(pos, range.to()) <= 0)
        { return i }
    }
    return -1
  };

  var Range = function(anchor, head) {
    this.anchor = anchor; this.head = head;
  };

  Range.prototype.from = function () { return minPos(this.anchor, this.head) };
  Range.prototype.to = function () { return maxPos(this.anchor, this.head) };
  Range.prototype.empty = function () { return this.head.line == this.anchor.line && this.head.ch == this.anchor.ch };

  // Take an unsorted, potentially overlapping set of ranges, and
  // build a selection out of it. 'Consumes' ranges array (modifying
  // it).
  function normalizeSelection(cm, ranges, primIndex) {
    var mayTouch = cm && cm.options.selectionsMayTouch;
    var prim = ranges[primIndex];
    ranges.sort(function (a, b) { return cmp(a.from(), b.from()); });
    primIndex = indexOf(ranges, prim);
    for (var i = 1; i < ranges.length; i++) {
      var cur = ranges[i], prev = ranges[i - 1];
      var diff = cmp(prev.to(), cur.from());
      if (mayTouch && !cur.empty() ? diff > 0 : diff >= 0) {
        var from = minPos(prev.from(), cur.from()), to = maxPos(prev.to(), cur.to());
        var inv = prev.empty() ? cur.from() == cur.head : prev.from() == prev.head;
        if (i <= primIndex) { --primIndex; }
        ranges.splice(--i, 2, new Range(inv ? to : from, inv ? from : to));
      }
    }
    return new Selection(ranges, primIndex)
  }

  function simpleSelection(anchor, head) {
    return new Selection([new Range(anchor, head || anchor)], 0)
  }

  // Compute the position of the end of a change (its 'to' property
  // refers to the pre-change end).
  function changeEnd(change) {
    if (!change.text) { return change.to }
    return Pos(change.from.line + change.text.length - 1,
               lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0))
  }

  // Adjust a position to refer to the post-change position of the
  // same text, or the end of the change if the change covers it.
  function adjustForChange(pos, change) {
    if (cmp(pos, change.from) < 0) { return pos }
    if (cmp(pos, change.to) <= 0) { return changeEnd(change) }

    var line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch;
    if (pos.line == change.to.line) { ch += changeEnd(change).ch - change.to.ch; }
    return Pos(line, ch)
  }

  function computeSelAfterChange(doc, change) {
    var out = [];
    for (var i = 0; i < doc.sel.ranges.length; i++) {
      var range = doc.sel.ranges[i];
      out.push(new Range(adjustForChange(range.anchor, change),
                         adjustForChange(range.head, change)));
    }
    return normalizeSelection(doc.cm, out, doc.sel.primIndex)
  }

  function offsetPos(pos, old, nw) {
    if (pos.line == old.line)
      { return Pos(nw.line, pos.ch - old.ch + nw.ch) }
    else
      { return Pos(nw.line + (pos.line - old.line), pos.ch) }
  }

  // Used by replaceSelections to allow moving the selection to the
  // start or around the replaced test. Hint may be "start" or "around".
  function computeReplacedSel(doc, changes, hint) {
    var out = [];
    var oldPrev = Pos(doc.first, 0), newPrev = oldPrev;
    for (var i = 0; i < changes.length; i++) {
      var change = changes[i];
      var from = offsetPos(change.from, oldPrev, newPrev);
      var to = offsetPos(changeEnd(change), oldPrev, newPrev);
      oldPrev = change.to;
      newPrev = to;
      if (hint == "around") {
        var range = doc.sel.ranges[i], inv = cmp(range.head, range.anchor) < 0;
        out[i] = new Range(inv ? to : from, inv ? from : to);
      } else {
        out[i] = new Range(from, from);
      }
    }
    return new Selection(out, doc.sel.primIndex)
  }

  // Used to get the editor into a consistent state again when options change.

  function loadMode(cm) {
    cm.doc.mode = getMode(cm.options, cm.doc.modeOption);
    resetModeState(cm);
  }

  function resetModeState(cm) {
    cm.doc.iter(function (line) {
      if (line.stateAfter) { line.stateAfter = null; }
      if (line.styles) { line.styles = null; }
    });
    cm.doc.modeFrontier = cm.doc.highlightFrontier = cm.doc.first;
    startWorker(cm, 100);
    cm.state.modeGen++;
    if (cm.curOp) { regChange(cm); }
  }

  // DOCUMENT DATA STRUCTURE

  // By default, updates that start and end at the beginning of a line
  // are treated specially, in order to make the association of line
  // widgets and marker elements with the text behave more intuitive.
  function isWholeLineUpdate(doc, change) {
    return change.from.ch == 0 && change.to.ch == 0 && lst(change.text) == "" &&
      (!doc.cm || doc.cm.options.wholeLineUpdateBefore)
  }

  // Perform a change on the document data structure.
  function updateDoc(doc, change, markedSpans, estimateHeight) {
    function spansFor(n) {return markedSpans ? markedSpans[n] : null}
    function update(line, text, spans) {
      updateLine(line, text, spans, estimateHeight);
      signalLater(line, "change", line, change);
    }
    function linesFor(start, end) {
      var result = [];
      for (var i = start; i < end; ++i)
        { result.push(new Line(text[i], spansFor(i), estimateHeight)); }
      return result
    }

    var from = change.from, to = change.to, text = change.text;
    var firstLine = getLine(doc, from.line), lastLine = getLine(doc, to.line);
    var lastText = lst(text), lastSpans = spansFor(text.length - 1), nlines = to.line - from.line;

    // Adjust the line structure
    if (change.full) {
      doc.insert(0, linesFor(0, text.length));
      doc.remove(text.length, doc.size - text.length);
    } else if (isWholeLineUpdate(doc, change)) {
      // This is a whole-line replace. Treated specially to make
      // sure line objects move the way they are supposed to.
      var added = linesFor(0, text.length - 1);
      update(lastLine, lastLine.text, lastSpans);
      if (nlines) { doc.remove(from.line, nlines); }
      if (added.length) { doc.insert(from.line, added); }
    } else if (firstLine == lastLine) {
      if (text.length == 1) {
        update(firstLine, firstLine.text.slice(0, from.ch) + lastText + firstLine.text.slice(to.ch), lastSpans);
      } else {
        var added$1 = linesFor(1, text.length - 1);
        added$1.push(new Line(lastText + firstLine.text.slice(to.ch), lastSpans, estimateHeight));
        update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
        doc.insert(from.line + 1, added$1);
      }
    } else if (text.length == 1) {
      update(firstLine, firstLine.text.slice(0, from.ch) + text[0] + lastLine.text.slice(to.ch), spansFor(0));
      doc.remove(from.line + 1, nlines);
    } else {
      update(firstLine, firstLine.text.slice(0, from.ch) + text[0], spansFor(0));
      update(lastLine, lastText + lastLine.text.slice(to.ch), lastSpans);
      var added$2 = linesFor(1, text.length - 1);
      if (nlines > 1) { doc.remove(from.line + 1, nlines - 1); }
      doc.insert(from.line + 1, added$2);
    }

    signalLater(doc, "change", doc, change);
  }

  // Call f for all linked documents.
  function linkedDocs(doc, f, sharedHistOnly) {
    function propagate(doc, skip, sharedHist) {
      if (doc.linked) { for (var i = 0; i < doc.linked.length; ++i) {
        var rel = doc.linked[i];
        if (rel.doc == skip) { continue }
        var shared = sharedHist && rel.sharedHist;
        if (sharedHistOnly && !shared) { continue }
        f(rel.doc, shared);
        propagate(rel.doc, doc, shared);
      } }
    }
    propagate(doc, null, true);
  }

  // Attach a document to an editor.
  function attachDoc(cm, doc) {
    if (doc.cm) { throw new Error("This document is already in use.") }
    cm.doc = doc;
    doc.cm = cm;
    estimateLineHeights(cm);
    loadMode(cm);
    setDirectionClass(cm);
    if (!cm.options.lineWrapping) { findMaxLine(cm); }
    cm.options.mode = doc.modeOption;
    regChange(cm);
  }

  function setDirectionClass(cm) {
  (cm.doc.direction == "rtl" ? addClass : rmClass)(cm.display.lineDiv, "CodeMirror-rtl");
  }

  function directionChanged(cm) {
    runInOp(cm, function () {
      setDirectionClass(cm);
      regChange(cm);
    });
  }

  function History(startGen) {
    // Arrays of change events and selections. Doing something adds an
    // event to done and clears undo. Undoing moves events from done
    // to undone, redoing moves them in the other direction.
    this.done = []; this.undone = [];
    this.undoDepth = Infinity;
    // Used to track when changes can be merged into a single undo
    // event
    this.lastModTime = this.lastSelTime = 0;
    this.lastOp = this.lastSelOp = null;
    this.lastOrigin = this.lastSelOrigin = null;
    // Used by the isClean() method
    this.generation = this.maxGeneration = startGen || 1;
  }

  // Create a history change event from an updateDoc-style change
  // object.
  function historyChangeFromChange(doc, change) {
    var histChange = {from: copyPos(change.from), to: changeEnd(change), text: getBetween(doc, change.from, change.to)};
    attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1);
    linkedDocs(doc, function (doc) { return attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1); }, true);
    return histChange
  }

  // Pop all selection events off the end of a history array. Stop at
  // a change event.
  function clearSelectionEvents(array) {
    while (array.length) {
      var last = lst(array);
      if (last.ranges) { array.pop(); }
      else { break }
    }
  }

  // Find the top change event in the history. Pop off selection
  // events that are in the way.
  function lastChangeEvent(hist, force) {
    if (force) {
      clearSelectionEvents(hist.done);
      return lst(hist.done)
    } else if (hist.done.length && !lst(hist.done).ranges) {
      return lst(hist.done)
    } else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {
      hist.done.pop();
      return lst(hist.done)
    }
  }

  // Register a change in the history. Merges changes that are within
  // a single operation, or are close together with an origin that
  // allows merging (starting with "+") into a single event.
  function addChangeToHistory(doc, change, selAfter, opId) {
    var hist = doc.history;
    hist.undone.length = 0;
    var time = +new Date, cur;
    var last;

    if ((hist.lastOp == opId ||
         hist.lastOrigin == change.origin && change.origin &&
         ((change.origin.charAt(0) == "+" && hist.lastModTime > time - (doc.cm ? doc.cm.options.historyEventDelay : 500)) ||
          change.origin.charAt(0) == "*")) &&
        (cur = lastChangeEvent(hist, hist.lastOp == opId))) {
      // Merge this change into the last event
      last = lst(cur.changes);
      if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {
        // Optimized case for simple insertion -- don't want to add
        // new changesets for every character typed
        last.to = changeEnd(change);
      } else {
        // Add new sub-event
        cur.changes.push(historyChangeFromChange(doc, change));
      }
    } else {
      // Can not be merged, start a new event.
      var before = lst(hist.done);
      if (!before || !before.ranges)
        { pushSelectionToHistory(doc.sel, hist.done); }
      cur = {changes: [historyChangeFromChange(doc, change)],
             generation: hist.generation};
      hist.done.push(cur);
      while (hist.done.length > hist.undoDepth) {
        hist.done.shift();
        if (!hist.done[0].ranges) { hist.done.shift(); }
      }
    }
    hist.done.push(selAfter);
    hist.generation = ++hist.maxGeneration;
    hist.lastModTime = hist.lastSelTime = time;
    hist.lastOp = hist.lastSelOp = opId;
    hist.lastOrigin = hist.lastSelOrigin = change.origin;

    if (!last) { signal(doc, "historyAdded"); }
  }

  function selectionEventCanBeMerged(doc, origin, prev, sel) {
    var ch = origin.charAt(0);
    return ch == "*" ||
      ch == "+" &&
      prev.ranges.length == sel.ranges.length &&
      prev.somethingSelected() == sel.somethingSelected() &&
      new Date - doc.history.lastSelTime <= (doc.cm ? doc.cm.options.historyEventDelay : 500)
  }

  // Called whenever the selection changes, sets the new selection as
  // the pending selection in the history, and pushes the old pending
  // selection into the 'done' array when it was significantly
  // different (in number of selected ranges, emptiness, or time).
  function addSelectionToHistory(doc, sel, opId, options) {
    var hist = doc.history, origin = options && options.origin;

    // A new event is started when the previous origin does not match
    // the current, or the origins don't allow matching. Origins
    // starting with * are always merged, those starting with + are
    // merged when similar and close together in time.
    if (opId == hist.lastSelOp ||
        (origin && hist.lastSelOrigin == origin &&
         (hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin ||
          selectionEventCanBeMerged(doc, origin, lst(hist.done), sel))))
      { hist.done[hist.done.length - 1] = sel; }
    else
      { pushSelectionToHistory(sel, hist.done); }

    hist.lastSelTime = +new Date;
    hist.lastSelOrigin = origin;
    hist.lastSelOp = opId;
    if (options && options.clearRedo !== false)
      { clearSelectionEvents(hist.undone); }
  }

  function pushSelectionToHistory(sel, dest) {
    var top = lst(dest);
    if (!(top && top.ranges && top.equals(sel)))
      { dest.push(sel); }
  }

  // Used to store marked span information in the history.
  function attachLocalSpans(doc, change, from, to) {
    var existing = change["spans_" + doc.id], n = 0;
    doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), function (line) {
      if (line.markedSpans)
        { (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans; }
      ++n;
    });
  }

  // When un/re-doing restores text containing marked spans, those
  // that have been explicitly cleared should not be restored.
  function removeClearedSpans(spans) {
    if (!spans) { return null }
    var out;
    for (var i = 0; i < spans.length; ++i) {
      if (spans[i].marker.explicitlyCleared) { if (!out) { out = spans.slice(0, i); } }
      else if (out) { out.push(spans[i]); }
    }
    return !out ? spans : out.length ? out : null
  }

  // Retrieve and filter the old marked spans stored in a change event.
  function getOldSpans(doc, change) {
    var found = change["spans_" + doc.id];
    if (!found) { return null }
    var nw = [];
    for (var i = 0; i < change.text.length; ++i)
      { nw.push(removeClearedSpans(found[i])); }
    return nw
  }

  // Used for un/re-doing changes from the history. Combines the
  // result of computing the existing spans with the set of spans that
  // existed in the history (so that deleting around a span and then
  // undoing brings back the span).
  function mergeOldSpans(doc, change) {
    var old = getOldSpans(doc, change);
    var stretched = stretchSpansOverChange(doc, change);
    if (!old) { return stretched }
    if (!stretched) { return old }

    for (var i = 0; i < old.length; ++i) {
      var oldCur = old[i], stretchCur = stretched[i];
      if (oldCur && stretchCur) {
        spans: for (var j = 0; j < stretchCur.length; ++j) {
          var span = stretchCur[j];
          for (var k = 0; k < oldCur.length; ++k)
            { if (oldCur[k].marker == span.marker) { continue spans } }
          oldCur.push(span);
        }
      } else if (stretchCur) {
        old[i] = stretchCur;
      }
    }
    return old
  }

  // Used both to provide a JSON-safe object in .getHistory, and, when
  // detaching a document, to split the history in two
  function copyHistoryArray(events, newGroup, instantiateSel) {
    var copy = [];
    for (var i = 0; i < events.length; ++i) {
      var event = events[i];
      if (event.ranges) {
        copy.push(instantiateSel ? Selection.prototype.deepCopy.call(event) : event);
        continue
      }
      var changes = event.changes, newChanges = [];
      copy.push({changes: newChanges});
      for (var j = 0; j < changes.length; ++j) {
        var change = changes[j], m = (void 0);
        newChanges.push({from: change.from, to: change.to, text: change.text});
        if (newGroup) { for (var prop in change) { if (m = prop.match(/^spans_(\d+)$/)) {
          if (indexOf(newGroup, Number(m[1])) > -1) {
            lst(newChanges)[prop] = change[prop];
            delete change[prop];
          }
        } } }
      }
    }
    return copy
  }

  // The 'scroll' parameter given to many of these indicated whether
  // the new cursor position should be scrolled into view after
  // modifying the selection.

  // If shift is held or the extend flag is set, extends a range to
  // include a given position (and optionally a second position).
  // Otherwise, simply returns the range between the given positions.
  // Used for cursor motion and such.
  function extendRange(range, head, other, extend) {
    if (extend) {
      var anchor = range.anchor;
      if (other) {
        var posBefore = cmp(head, anchor) < 0;
        if (posBefore != (cmp(other, anchor) < 0)) {
          anchor = head;
          head = other;
        } else if (posBefore != (cmp(head, other) < 0)) {
          head = other;
        }
      }
      return new Range(anchor, head)
    } else {
      return new Range(other || head, head)
    }
  }

  // Extend the primary selection range, discard the rest.
  function extendSelection(doc, head, other, options, extend) {
    if (extend == null) { extend = doc.cm && (doc.cm.display.shift || doc.extend); }
    setSelection(doc, new Selection([extendRange(doc.sel.primary(), head, other, extend)], 0), options);
  }

  // Extend all selections (pos is an array of selections with length
  // equal the number of selections)
  function extendSelections(doc, heads, options) {
    var out = [];
    var extend = doc.cm && (doc.cm.display.shift || doc.extend);
    for (var i = 0; i < doc.sel.ranges.length; i++)
      { out[i] = extendRange(doc.sel.ranges[i], heads[i], null, extend); }
    var newSel = normalizeSelection(doc.cm, out, doc.sel.primIndex);
    setSelection(doc, newSel, options);
  }

  // Updates a single range in the selection.
  function replaceOneSelection(doc, i, range, options) {
    var ranges = doc.sel.ranges.slice(0);
    ranges[i] = range;
    setSelection(doc, normalizeSelection(doc.cm, ranges, doc.sel.primIndex), options);
  }

  // Reset the selection to a single range.
  function setSimpleSelection(doc, anchor, head, options) {
    setSelection(doc, simpleSelection(anchor, head), options);
  }

  // Give beforeSelectionChange handlers a change to influence a
  // selection update.
  function filterSelectionChange(doc, sel, options) {
    var obj = {
      ranges: sel.ranges,
      update: function(ranges) {
        this.ranges = [];
        for (var i = 0; i < ranges.length; i++)
          { this.ranges[i] = new Range(clipPos(doc, ranges[i].anchor),
                                     clipPos(doc, ranges[i].head)); }
      },
      origin: options && options.origin
    };
    signal(doc, "beforeSelectionChange", doc, obj);
    if (doc.cm) { signal(doc.cm, "beforeSelectionChange", doc.cm, obj); }
    if (obj.ranges != sel.ranges) { return normalizeSelection(doc.cm, obj.ranges, obj.ranges.length - 1) }
    else { return sel }
  }

  function setSelectionReplaceHistory(doc, sel, options) {
    var done = doc.history.done, last = lst(done);
    if (last && last.ranges) {
      done[done.length - 1] = sel;
      setSelectionNoUndo(doc, sel, options);
    } else {
      setSelection(doc, sel, options);
    }
  }

  // Set a new selection.
  function setSelection(doc, sel, options) {
    setSelectionNoUndo(doc, sel, options);
    addSelectionToHistory(doc, doc.sel, doc.cm ? doc.cm.curOp.id : NaN, options);
  }

  function setSelectionNoUndo(doc, sel, options) {
    if (hasHandler(doc, "beforeSelectionChange") || doc.cm && hasHandler(doc.cm, "beforeSelectionChange"))
      { sel = filterSelectionChange(doc, sel, options); }

    var bias = options && options.bias ||
      (cmp(sel.primary().head, doc.sel.primary().head) < 0 ? -1 : 1);
    setSelectionInner(doc, skipAtomicInSelection(doc, sel, bias, true));

    if (!(options && options.scroll === false) && doc.cm)
      { ensureCursorVisible(doc.cm); }
  }

  function setSelectionInner(doc, sel) {
    if (sel.equals(doc.sel)) { return }

    doc.sel = sel;

    if (doc.cm) {
      doc.cm.curOp.updateInput = 1;
      doc.cm.curOp.selectionChanged = true;
      signalCursorActivity(doc.cm);
    }
    signalLater(doc, "cursorActivity", doc);
  }

  // Verify that the selection does not partially select any atomic
  // marked ranges.
  function reCheckSelection(doc) {
    setSelectionInner(doc, skipAtomicInSelection(doc, doc.sel, null, false));
  }

  // Return a selection that does not partially select any atomic
  // ranges.
  function skipAtomicInSelection(doc, sel, bias, mayClear) {
    var out;
    for (var i = 0; i < sel.ranges.length; i++) {
      var range = sel.ranges[i];
      var old = sel.ranges.length == doc.sel.ranges.length && doc.sel.ranges[i];
      var newAnchor = skipAtomic(doc, range.anchor, old && old.anchor, bias, mayClear);
      var newHead = skipAtomic(doc, range.head, old && old.head, bias, mayClear);
      if (out || newAnchor != range.anchor || newHead != range.head) {
        if (!out) { out = sel.ranges.slice(0, i); }
        out[i] = new Range(newAnchor, newHead);
      }
    }
    return out ? normalizeSelection(doc.cm, out, sel.primIndex) : sel
  }

  function skipAtomicInner(doc, pos, oldPos, dir, mayClear) {
    var line = getLine(doc, pos.line);
    if (line.markedSpans) { for (var i = 0; i < line.markedSpans.length; ++i) {
      var sp = line.markedSpans[i], m = sp.marker;

      // Determine if we should prevent the cursor being placed to the left/right of an atomic marker
      // Historically this was determined using the inclusiveLeft/Right option, but the new way to control it
      // is with selectLeft/Right
      var preventCursorLeft = ("selectLeft" in m) ? !m.selectLeft : m.inclusiveLeft;
      var preventCursorRight = ("selectRight" in m) ? !m.selectRight : m.inclusiveRight;

      if ((sp.from == null || (preventCursorLeft ? sp.from <= pos.ch : sp.from < pos.ch)) &&
          (sp.to == null || (preventCursorRight ? sp.to >= pos.ch : sp.to > pos.ch))) {
        if (mayClear) {
          signal(m, "beforeCursorEnter");
          if (m.explicitlyCleared) {
            if (!line.markedSpans) { break }
            else {--i; continue}
          }
        }
        if (!m.atomic) { continue }

        if (oldPos) {
          var near = m.find(dir < 0 ? 1 : -1), diff = (void 0);
          if (dir < 0 ? preventCursorRight : preventCursorLeft)
            { near = movePos(doc, near, -dir, near && near.line == pos.line ? line : null); }
          if (near && near.line == pos.line && (diff = cmp(near, oldPos)) && (dir < 0 ? diff < 0 : diff > 0))
            { return skipAtomicInner(doc, near, pos, dir, mayClear) }
        }

        var far = m.find(dir < 0 ? -1 : 1);
        if (dir < 0 ? preventCursorLeft : preventCursorRight)
          { far = movePos(doc, far, dir, far.line == pos.line ? line : null); }
        return far ? skipAtomicInner(doc, far, pos, dir, mayClear) : null
      }
    } }
    return pos
  }

  // Ensure a given position is not inside an atomic range.
  function skipAtomic(doc, pos, oldPos, bias, mayClear) {
    var dir = bias || 1;
    var found = skipAtomicInner(doc, pos, oldPos, dir, mayClear) ||
        (!mayClear && skipAtomicInner(doc, pos, oldPos, dir, true)) ||
        skipAtomicInner(doc, pos, oldPos, -dir, mayClear) ||
        (!mayClear && skipAtomicInner(doc, pos, oldPos, -dir, true));
    if (!found) {
      doc.cantEdit = true;
      return Pos(doc.first, 0)
    }
    return found
  }

  function movePos(doc, pos, dir, line) {
    if (dir < 0 && pos.ch == 0) {
      if (pos.line > doc.first) { return clipPos(doc, Pos(pos.line - 1)) }
      else { return null }
    } else if (dir > 0 && pos.ch == (line || getLine(doc, pos.line)).text.length) {
      if (pos.line < doc.first + doc.size - 1) { return Pos(pos.line + 1, 0) }
      else { return null }
    } else {
      return new Pos(pos.line, pos.ch + dir)
    }
  }

  function selectAll(cm) {
    cm.setSelection(Pos(cm.firstLine(), 0), Pos(cm.lastLine()), sel_dontScroll);
  }

  // UPDATING

  // Allow "beforeChange" event handlers to influence a change
  function filterChange(doc, change, update) {
    var obj = {
      canceled: false,
      from: change.from,
      to: change.to,
      text: change.text,
      origin: change.origin,
      cancel: function () { return obj.canceled = true; }
    };
    if (update) { obj.update = function (from, to, text, origin) {
      if (from) { obj.from = clipPos(doc, from); }
      if (to) { obj.to = clipPos(doc, to); }
      if (text) { obj.text = text; }
      if (origin !== undefined) { obj.origin = origin; }
    }; }
    signal(doc, "beforeChange", doc, obj);
    if (doc.cm) { signal(doc.cm, "beforeChange", doc.cm, obj); }

    if (obj.canceled) {
      if (doc.cm) { doc.cm.curOp.updateInput = 2; }
      return null
    }
    return {from: obj.from, to: obj.to, text: obj.text, origin: obj.origin}
  }

  // Apply a change to a document, and add it to the document's
  // history, and propagating it to all linked documents.
  function makeChange(doc, change, ignoreReadOnly) {
    if (doc.cm) {
      if (!doc.cm.curOp) { return operation(doc.cm, makeChange)(doc, change, ignoreReadOnly) }
      if (doc.cm.state.suppressEdits) { return }
    }

    if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {
      change = filterChange(doc, change, true);
      if (!change) { return }
    }

    // Possibly split or suppress the update based on the presence
    // of read-only spans in its range.
    var split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to);
    if (split) {
      for (var i = split.length - 1; i >= 0; --i)
        { makeChangeInner(doc, {from: split[i].from, to: split[i].to, text: i ? [""] : change.text, origin: change.origin}); }
    } else {
      makeChangeInner(doc, change);
    }
  }

  function makeChangeInner(doc, change) {
    if (change.text.length == 1 && change.text[0] == "" && cmp(change.from, change.to) == 0) { return }
    var selAfter = computeSelAfterChange(doc, change);
    addChangeToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN);

    makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change));
    var rebased = [];

    linkedDocs(doc, function (doc, sharedHist) {
      if (!sharedHist && indexOf(rebased, doc.history) == -1) {
        rebaseHist(doc.history, change);
        rebased.push(doc.history);
      }
      makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change));
    });
  }

  // Revert a change stored in a document's history.
  function makeChangeFromHistory(doc, type, allowSelectionOnly) {
    var suppress = doc.cm && doc.cm.state.suppressEdits;
    if (suppress && !allowSelectionOnly) { return }

    var hist = doc.history, event, selAfter = doc.sel;
    var source = type == "undo" ? hist.done : hist.undone, dest = type == "undo" ? hist.undone : hist.done;

    // Verify that there is a useable event (so that ctrl-z won't
    // needlessly clear selection events)
    var i = 0;
    for (; i < source.length; i++) {
      event = source[i];
      if (allowSelectionOnly ? event.ranges && !event.equals(doc.sel) : !event.ranges)
        { break }
    }
    if (i == source.length) { return }
    hist.lastOrigin = hist.lastSelOrigin = null;

    for (;;) {
      event = source.pop();
      if (event.ranges) {
        pushSelectionToHistory(event, dest);
        if (allowSelectionOnly && !event.equals(doc.sel)) {
          setSelection(doc, event, {clearRedo: false});
          return
        }
        selAfter = event;
      } else if (suppress) {
        source.push(event);
        return
      } else { break }
    }

    // Build up a reverse change object to add to the opposite history
    // stack (redo when undoing, and vice versa).
    var antiChanges = [];
    pushSelectionToHistory(selAfter, dest);
    dest.push({changes: antiChanges, generation: hist.generation});
    hist.generation = event.generation || ++hist.maxGeneration;

    var filter = hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange");

    var loop = function ( i ) {
      var change = event.changes[i];
      change.origin = type;
      if (filter && !filterChange(doc, change, false)) {
        source.length = 0;
        return {}
      }

      antiChanges.push(historyChangeFromChange(doc, change));

      var after = i ? computeSelAfterChange(doc, change) : lst(source);
      makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change));
      if (!i && doc.cm) { doc.cm.scrollIntoView({from: change.from, to: changeEnd(change)}); }
      var rebased = [];

      // Propagate to the linked documents
      linkedDocs(doc, function (doc, sharedHist) {
        if (!sharedHist && indexOf(rebased, doc.history) == -1) {
          rebaseHist(doc.history, change);
          rebased.push(doc.history);
        }
        makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change));
      });
    };

    for (var i$1 = event.changes.length - 1; i$1 >= 0; --i$1) {
      var returned = loop( i$1 );

      if ( returned ) return returned.v;
    }
  }

  // Sub-views need their line numbers shifted when text is added
  // above or below them in the parent document.
  function shiftDoc(doc, distance) {
    if (distance == 0) { return }
    doc.first += distance;
    doc.sel = new Selection(map(doc.sel.ranges, function (range) { return new Range(
      Pos(range.anchor.line + distance, range.anchor.ch),
      Pos(range.head.line + distance, range.head.ch)
    ); }), doc.sel.primIndex);
    if (doc.cm) {
      regChange(doc.cm, doc.first, doc.first - distance, distance);
      for (var d = doc.cm.display, l = d.viewFrom; l < d.viewTo; l++)
        { regLineChange(doc.cm, l, "gutter"); }
    }
  }

  // More lower-level change function, handling only a single document
  // (not linked ones).
  function makeChangeSingleDoc(doc, change, selAfter, spans) {
    if (doc.cm && !doc.cm.curOp)
      { return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans) }

    if (change.to.line < doc.first) {
      shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line));
      return
    }
    if (change.from.line > doc.lastLine()) { return }

    // Clip the change to the size of this doc
    if (change.from.line < doc.first) {
      var shift = change.text.length - 1 - (doc.first - change.from.line);
      shiftDoc(doc, shift);
      change = {from: Pos(doc.first, 0), to: Pos(change.to.line + shift, change.to.ch),
                text: [lst(change.text)], origin: change.origin};
    }
    var last = doc.lastLine();
    if (change.to.line > last) {
      change = {from: change.from, to: Pos(last, getLine(doc, last).text.length),
                text: [change.text[0]], origin: change.origin};
    }

    change.removed = getBetween(doc, change.from, change.to);

    if (!selAfter) { selAfter = computeSelAfterChange(doc, change); }
    if (doc.cm) { makeChangeSingleDocInEditor(doc.cm, change, spans); }
    else { updateDoc(doc, change, spans); }
    setSelectionNoUndo(doc, selAfter, sel_dontScroll);

    if (doc.cantEdit && skipAtomic(doc, Pos(doc.firstLine(), 0)))
      { doc.cantEdit = false; }
  }

  // Handle the interaction of a change to a document with the editor
  // that this document is part of.
  function makeChangeSingleDocInEditor(cm, change, spans) {
    var doc = cm.doc, display = cm.display, from = change.from, to = change.to;

    var recomputeMaxLength = false, checkWidthStart = from.line;
    if (!cm.options.lineWrapping) {
      checkWidthStart = lineNo(visualLine(getLine(doc, from.line)));
      doc.iter(checkWidthStart, to.line + 1, function (line) {
        if (line == display.maxLine) {
          recomputeMaxLength = true;
          return true
        }
      });
    }

    if (doc.sel.contains(change.from, change.to) > -1)
      { signalCursorActivity(cm); }

    updateDoc(doc, change, spans, estimateHeight(cm));

    if (!cm.options.lineWrapping) {
      doc.iter(checkWidthStart, from.line + change.text.length, function (line) {
        var len = lineLength(line);
        if (len > display.maxLineLength) {
          display.maxLine = line;
          display.maxLineLength = len;
          display.maxLineChanged = true;
          recomputeMaxLength = false;
        }
      });
      if (recomputeMaxLength) { cm.curOp.updateMaxLine = true; }
    }

    retreatFrontier(doc, from.line);
    startWorker(cm, 400);

    var lendiff = change.text.length - (to.line - from.line) - 1;
    // Remember that these lines changed, for updating the display
    if (change.full)
      { regChange(cm); }
    else if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change))
      { regLineChange(cm, from.line, "text"); }
    else
      { regChange(cm, from.line, to.line + 1, lendiff); }

    var changesHandler = hasHandler(cm, "changes"), changeHandler = hasHandler(cm, "change");
    if (changeHandler || changesHandler) {
      var obj = {
        from: from, to: to,
        text: change.text,
        removed: change.removed,
        origin: change.origin
      };
      if (changeHandler) { signalLater(cm, "change", cm, obj); }
      if (changesHandler) { (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push(obj); }
    }
    cm.display.selForContextMenu = null;
  }

  function replaceRange(doc, code, from, to, origin) {
    var assign;

    if (!to) { to = from; }
    if (cmp(to, from) < 0) { (assign = [to, from], from = assign[0], to = assign[1]); }
    if (typeof code == "string") { code = doc.splitLines(code); }
    makeChange(doc, {from: from, to: to, text: code, origin: origin});
  }

  // Rebasing/resetting history to deal with externally-sourced changes

  function rebaseHistSelSingle(pos, from, to, diff) {
    if (to < pos.line) {
      pos.line += diff;
    } else if (from < pos.line) {
      pos.line = from;
      pos.ch = 0;
    }
  }

  // Tries to rebase an array of history events given a change in the
  // document. If the change touches the same lines as the event, the
  // event, and everything 'behind' it, is discarded. If the change is
  // before the event, the event's positions are updated. Uses a
  // copy-on-write scheme for the positions, to avoid having to
  // reallocate them all on every rebase, but also avoid problems with
  // shared position objects being unsafely updated.
  function rebaseHistArray(array, from, to, diff) {
    for (var i = 0; i < array.length; ++i) {
      var sub = array[i], ok = true;
      if (sub.ranges) {
        if (!sub.copied) { sub = array[i] = sub.deepCopy(); sub.copied = true; }
        for (var j = 0; j < sub.ranges.length; j++) {
          rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff);
          rebaseHistSelSingle(sub.ranges[j].head, from, to, diff);
        }
        continue
      }
      for (var j$1 = 0; j$1 < sub.changes.length; ++j$1) {
        var cur = sub.changes[j$1];
        if (to < cur.from.line) {
          cur.from = Pos(cur.from.line + diff, cur.from.ch);
          cur.to = Pos(cur.to.line + diff, cur.to.ch);
        } else if (from <= cur.to.line) {
          ok = false;
          break
        }
      }
      if (!ok) {
        array.splice(0, i + 1);
        i = 0;
      }
    }
  }

  function rebaseHist(hist, change) {
    var from = change.from.line, to = change.to.line, diff = change.text.length - (to - from) - 1;
    rebaseHistArray(hist.done, from, to, diff);
    rebaseHistArray(hist.undone, from, to, diff);
  }

  // Utility for applying a change to a line by handle or number,
  // returning the number and optionally registering the line as
  // changed.
  function changeLine(doc, handle, changeType, op) {
    var no = handle, line = handle;
    if (typeof handle == "number") { line = getLine(doc, clipLine(doc, handle)); }
    else { no = lineNo(handle); }
    if (no == null) { return null }
    if (op(line, no) && doc.cm) { regLineChange(doc.cm, no, changeType); }
    return line
  }

  // The document is represented as a BTree consisting of leaves, with
  // chunk of lines in them, and branches, with up to ten leaves or
  // other branch nodes below them. The top node is always a branch
  // node, and is the document object itself (meaning it has
  // additional methods and properties).
  //
  // All nodes have parent links. The tree is used both to go from
  // line numbers to line objects, and to go from objects to numbers.
  // It also indexes by height, and is used to convert between height
  // and line object, and to find the total height of the document.
  //
  // See also http://marijnhaverbeke.nl/blog/codemirror-line-tree.html

  function LeafChunk(lines) {
    this.lines = lines;
    this.parent = null;
    var height = 0;
    for (var i = 0; i < lines.length; ++i) {
      lines[i].parent = this;
      height += lines[i].height;
    }
    this.height = height;
  }

  LeafChunk.prototype = {
    chunkSize: function() { return this.lines.length },

    // Remove the n lines at offset 'at'.
    removeInner: function(at, n) {
      for (var i = at, e = at + n; i < e; ++i) {
        var line = this.lines[i];
        this.height -= line.height;
        cleanUpLine(line);
        signalLater(line, "delete");
      }
      this.lines.splice(at, n);
    },

    // Helper used to collapse a small branch into a single leaf.
    collapse: function(lines) {
      lines.push.apply(lines, this.lines);
    },

    // Insert the given array of lines at offset 'at', count them as
    // having the given height.
    insertInner: function(at, lines, height) {
      this.height += height;
      this.lines = this.lines.slice(0, at).concat(lines).concat(this.lines.slice(at));
      for (var i = 0; i < lines.length; ++i) { lines[i].parent = this; }
    },

    // Used to iterate over a part of the tree.
    iterN: function(at, n, op) {
      for (var e = at + n; at < e; ++at)
        { if (op(this.lines[at])) { return true } }
    }
  };

  function BranchChunk(children) {
    this.children = children;
    var size = 0, height = 0;
    for (var i = 0; i < children.length; ++i) {
      var ch = children[i];
      size += ch.chunkSize(); height += ch.height;
      ch.parent = this;
    }
    this.size = size;
    this.height = height;
    this.parent = null;
  }

  BranchChunk.prototype = {
    chunkSize: function() { return this.size },

    removeInner: function(at, n) {
      this.size -= n;
      for (var i = 0; i < this.children.length; ++i) {
        var child = this.children[i], sz = child.chunkSize();
        if (at < sz) {
          var rm = Math.min(n, sz - at), oldHeight = child.height;
          child.removeInner(at, rm);
          this.height -= oldHeight - child.height;
          if (sz == rm) { this.children.splice(i--, 1); child.parent = null; }
          if ((n -= rm) == 0) { break }
          at = 0;
        } else { at -= sz; }
      }
      // If the result is smaller than 25 lines, ensure that it is a
      // single leaf node.
      if (this.size - n < 25 &&
          (this.children.length > 1 || !(this.children[0] instanceof LeafChunk))) {
        var lines = [];
        this.collapse(lines);
        this.children = [new LeafChunk(lines)];
        this.children[0].parent = this;
      }
    },

    collapse: function(lines) {
      for (var i = 0; i < this.children.length; ++i) { this.children[i].collapse(lines); }
    },

    insertInner: function(at, lines, height) {
      this.size += lines.length;
      this.height += height;
      for (var i = 0; i < this.children.length; ++i) {
        var child = this.children[i], sz = child.chunkSize();
        if (at <= sz) {
          child.insertInner(at, lines, height);
          if (child.lines && child.lines.length > 50) {
            // To avoid memory thrashing when child.lines is huge (e.g. first view of a large file), it's never spliced.
            // Instead, small slices are taken. They're taken in order because sequential memory accesses are fastest.
            var remaining = child.lines.length % 25 + 25;
            for (var pos = remaining; pos < child.lines.length;) {
              var leaf = new LeafChunk(child.lines.slice(pos, pos += 25));
              child.height -= leaf.height;
              this.children.splice(++i, 0, leaf);
              leaf.parent = this;
            }
            child.lines = child.lines.slice(0, remaining);
            this.maybeSpill();
          }
          break
        }
        at -= sz;
      }
    },

    // When a node has grown, check whether it should be split.
    maybeSpill: function() {
      if (this.children.length <= 10) { return }
      var me = this;
      do {
        var spilled = me.children.splice(me.children.length - 5, 5);
        var sibling = new BranchChunk(spilled);
        if (!me.parent) { // Become the parent node
          var copy = new BranchChunk(me.children);
          copy.parent = me;
          me.children = [copy, sibling];
          me = copy;
       } else {
          me.size -= sibling.size;
          me.height -= sibling.height;
          var myIndex = indexOf(me.parent.children, me);
          me.parent.children.splice(myIndex + 1, 0, sibling);
        }
        sibling.parent = me.parent;
      } while (me.children.length > 10)
      me.parent.maybeSpill();
    },

    iterN: function(at, n, op) {
      for (var i = 0; i < this.children.length; ++i) {
        var child = this.children[i], sz = child.chunkSize();
        if (at < sz) {
          var used = Math.min(n, sz - at);
          if (child.iterN(at, used, op)) { return true }
          if ((n -= used) == 0) { break }
          at = 0;
        } else { at -= sz; }
      }
    }
  };

  // Line widgets are block elements displayed above or below a line.

  var LineWidget = function(doc, node, options) {
    if (options) { for (var opt in options) { if (options.hasOwnProperty(opt))
      { this[opt] = options[opt]; } } }
    this.doc = doc;
    this.node = node;
  };

  LineWidget.prototype.clear = function () {
    var cm = this.doc.cm, ws = this.line.widgets, line = this.line, no = lineNo(line);
    if (no == null || !ws) { return }
    for (var i = 0; i < ws.length; ++i) { if (ws[i] == this) { ws.splice(i--, 1); } }
    if (!ws.length) { line.widgets = null; }
    var height = widgetHeight(this);
    updateLineHeight(line, Math.max(0, line.height - height));
    if (cm) {
      runInOp(cm, function () {
        adjustScrollWhenAboveVisible(cm, line, -height);
        regLineChange(cm, no, "widget");
      });
      signalLater(cm, "lineWidgetCleared", cm, this, no);
    }
  };

  LineWidget.prototype.changed = function () {
      var this$1 = this;

    var oldH = this.height, cm = this.doc.cm, line = this.line;
    this.height = null;
    var diff = widgetHeight(this) - oldH;
    if (!diff) { return }
    if (!lineIsHidden(this.doc, line)) { updateLineHeight(line, line.height + diff); }
    if (cm) {
      runInOp(cm, function () {
        cm.curOp.forceUpdate = true;
        adjustScrollWhenAboveVisible(cm, line, diff);
        signalLater(cm, "lineWidgetChanged", cm, this$1, lineNo(line));
      });
    }
  };
  eventMixin(LineWidget);

  function adjustScrollWhenAboveVisible(cm, line, diff) {
    if (heightAtLine(line) < ((cm.curOp && cm.curOp.scrollTop) || cm.doc.scrollTop))
      { addToScrollTop(cm, diff); }
  }

  function addLineWidget(doc, handle, node, options) {
    var widget = new LineWidget(doc, node, options);
    var cm = doc.cm;
    if (cm && widget.noHScroll) { cm.display.alignWidgets = true; }
    changeLine(doc, handle, "widget", function (line) {
      var widgets = line.widgets || (line.widgets = []);
      if (widget.insertAt == null) { widgets.push(widget); }
      else { widgets.splice(Math.min(widgets.length - 1, Math.max(0, widget.insertAt)), 0, widget); }
      widget.line = line;
      if (cm && !lineIsHidden(doc, line)) {
        var aboveVisible = heightAtLine(line) < doc.scrollTop;
        updateLineHeight(line, line.height + widgetHeight(widget));
        if (aboveVisible) { addToScrollTop(cm, widget.height); }
        cm.curOp.forceUpdate = true;
      }
      return true
    });
    if (cm) { signalLater(cm, "lineWidgetAdded", cm, widget, typeof handle == "number" ? handle : lineNo(handle)); }
    return widget
  }

  // TEXTMARKERS

  // Created with markText and setBookmark methods. A TextMarker is a
  // handle that can be used to clear or find a marked position in the
  // document. Line objects hold arrays (markedSpans) containing
  // {from, to, marker} object pointing to such marker objects, and
  // indicating that such a marker is present on that line. Multiple
  // lines may point to the same marker when it spans across lines.
  // The spans will have null for their from/to properties when the
  // marker continues beyond the start/end of the line. Markers have
  // links back to the lines they currently touch.

  // Collapsed markers have unique ids, in order to be able to order
  // them, which is needed for uniquely determining an outer marker
  // when they overlap (they may nest, but not partially overlap).
  var nextMarkerId = 0;

  var TextMarker = function(doc, type) {
    this.lines = [];
    this.type = type;
    this.doc = doc;
    this.id = ++nextMarkerId;
  };

  // Clear the marker.
  TextMarker.prototype.clear = function () {
    if (this.explicitlyCleared) { return }
    var cm = this.doc.cm, withOp = cm && !cm.curOp;
    if (withOp) { startOperation(cm); }
    if (hasHandler(this, "clear")) {
      var found = this.find();
      if (found) { signalLater(this, "clear", found.from, found.to); }
    }
    var min = null, max = null;
    for (var i = 0; i < this.lines.length; ++i) {
      var line = this.lines[i];
      var span = getMarkedSpanFor(line.markedSpans, this);
      if (cm && !this.collapsed) { regLineChange(cm, lineNo(line), "text"); }
      else if (cm) {
        if (span.to != null) { max = lineNo(line); }
        if (span.from != null) { min = lineNo(line); }
      }
      line.markedSpans = removeMarkedSpan(line.markedSpans, span);
      if (span.from == null && this.collapsed && !lineIsHidden(this.doc, line) && cm)
        { updateLineHeight(line, textHeight(cm.display)); }
    }
    if (cm && this.collapsed && !cm.options.lineWrapping) { for (var i$1 = 0; i$1 < this.lines.length; ++i$1) {
      var visual = visualLine(this.lines[i$1]), len = lineLength(visual);
      if (len > cm.display.maxLineLength) {
        cm.display.maxLine = visual;
        cm.display.maxLineLength = len;
        cm.display.maxLineChanged = true;
      }
    } }

    if (min != null && cm && this.collapsed) { regChange(cm, min, max + 1); }
    this.lines.length = 0;
    this.explicitlyCleared = true;
    if (this.atomic && this.doc.cantEdit) {
      this.doc.cantEdit = false;
      if (cm) { reCheckSelection(cm.doc); }
    }
    if (cm) { signalLater(cm, "markerCleared", cm, this, min, max); }
    if (withOp) { endOperation(cm); }
    if (this.parent) { this.parent.clear(); }
  };

  // Find the position of the marker in the document. Returns a {from,
  // to} object by default. Side can be passed to get a specific side
  // -- 0 (both), -1 (left), or 1 (right). When lineObj is true, the
  // Pos objects returned contain a line object, rather than a line
  // number (used to prevent looking up the same line twice).
  TextMarker.prototype.find = function (side, lineObj) {
    if (side == null && this.type == "bookmark") { side = 1; }
    var from, to;
    for (var i = 0; i < this.lines.length; ++i) {
      var line = this.lines[i];
      var span = getMarkedSpanFor(line.markedSpans, this);
      if (span.from != null) {
        from = Pos(lineObj ? line : lineNo(line), span.from);
        if (side == -1) { return from }
      }
      if (span.to != null) {
        to = Pos(lineObj ? line : lineNo(line), span.to);
        if (side == 1) { return to }
      }
    }
    return from && {from: from, to: to}
  };

  // Signals that the marker's widget changed, and surrounding layout
  // should be recomputed.
  TextMarker.prototype.changed = function () {
      var this$1 = this;

    var pos = this.find(-1, true), widget = this, cm = this.doc.cm;
    if (!pos || !cm) { return }
    runInOp(cm, function () {
      var line = pos.line, lineN = lineNo(pos.line);
      var view = findViewForLine(cm, lineN);
      if (view) {
        clearLineMeasurementCacheFor(view);
        cm.curOp.selectionChanged = cm.curOp.forceUpdate = true;
      }
      cm.curOp.updateMaxLine = true;
      if (!lineIsHidden(widget.doc, line) && widget.height != null) {
        var oldHeight = widget.height;
        widget.height = null;
        var dHeight = widgetHeight(widget) - oldHeight;
        if (dHeight)
          { updateLineHeight(line, line.height + dHeight); }
      }
      signalLater(cm, "markerChanged", cm, this$1);
    });
  };

  TextMarker.prototype.attachLine = function (line) {
    if (!this.lines.length && this.doc.cm) {
      var op = this.doc.cm.curOp;
      if (!op.maybeHiddenMarkers || indexOf(op.maybeHiddenMarkers, this) == -1)
        { (op.maybeUnhiddenMarkers || (op.maybeUnhiddenMarkers = [])).push(this); }
    }
    this.lines.push(line);
  };

  TextMarker.prototype.detachLine = function (line) {
    this.lines.splice(indexOf(this.lines, line), 1);
    if (!this.lines.length && this.doc.cm) {
      var op = this.doc.cm.curOp
      ;(op.maybeHiddenMarkers || (op.maybeHiddenMarkers = [])).push(this);
    }
  };
  eventMixin(TextMarker);

  // Create a marker, wire it up to the right lines, and
  function markText(doc, from, to, options, type) {
    // Shared markers (across linked documents) are handled separately
    // (markTextShared will call out to this again, once per
    // document).
    if (options && options.shared) { return markTextShared(doc, from, to, options, type) }
    // Ensure we are in an operation.
    if (doc.cm && !doc.cm.curOp) { return operation(doc.cm, markText)(doc, from, to, options, type) }

    var marker = new TextMarker(doc, type), diff = cmp(from, to);
    if (options) { copyObj(options, marker, false); }
    // Don't connect empty markers unless clearWhenEmpty is false
    if (diff > 0 || diff == 0 && marker.clearWhenEmpty !== false)
      { return marker }
    if (marker.replacedWith) {
      // Showing up as a widget implies collapsed (widget replaces text)
      marker.collapsed = true;
      marker.widgetNode = eltP("span", [marker.replacedWith], "CodeMirror-widget");
      if (!options.handleMouseEvents) { marker.widgetNode.setAttribute("cm-ignore-events", "true"); }
      if (options.insertLeft) { marker.widgetNode.insertLeft = true; }
    }
    if (marker.collapsed) {
      if (conflictingCollapsedRange(doc, from.line, from, to, marker) ||
          from.line != to.line && conflictingCollapsedRange(doc, to.line, from, to, marker))
        { throw new Error("Inserting collapsed marker partially overlapping an existing one") }
      seeCollapsedSpans();
    }

    if (marker.addToHistory)
      { addChangeToHistory(doc, {from: from, to: to, origin: "markText"}, doc.sel, NaN); }

    var curLine = from.line, cm = doc.cm, updateMaxLine;
    doc.iter(curLine, to.line + 1, function (line) {
      if (cm && marker.collapsed && !cm.options.lineWrapping && visualLine(line) == cm.display.maxLine)
        { updateMaxLine = true; }
      if (marker.collapsed && curLine != from.line) { updateLineHeight(line, 0); }
      addMarkedSpan(line, new MarkedSpan(marker,
                                         curLine == from.line ? from.ch : null,
                                         curLine == to.line ? to.ch : null));
      ++curLine;
    });
    // lineIsHidden depends on the presence of the spans, so needs a second pass
    if (marker.collapsed) { doc.iter(from.line, to.line + 1, function (line) {
      if (lineIsHidden(doc, line)) { updateLineHeight(line, 0); }
    }); }

    if (marker.clearOnEnter) { on(marker, "beforeCursorEnter", function () { return marker.clear(); }); }

    if (marker.readOnly) {
      seeReadOnlySpans();
      if (doc.history.done.length || doc.history.undone.length)
        { doc.clearHistory(); }
    }
    if (marker.collapsed) {
      marker.id = ++nextMarkerId;
      marker.atomic = true;
    }
    if (cm) {
      // Sync editor state
      if (updateMaxLine) { cm.curOp.updateMaxLine = true; }
      if (marker.collapsed)
        { regChange(cm, from.line, to.line + 1); }
      else if (marker.className || marker.startStyle || marker.endStyle || marker.css ||
               marker.attributes || marker.title)
        { for (var i = from.line; i <= to.line; i++) { regLineChange(cm, i, "text"); } }
      if (marker.atomic) { reCheckSelection(cm.doc); }
      signalLater(cm, "markerAdded", cm, marker);
    }
    return marker
  }

  // SHARED TEXTMARKERS

  // A shared marker spans multiple linked documents. It is
  // implemented as a meta-marker-object controlling multiple normal
  // markers.
  var SharedTextMarker = function(markers, primary) {
    this.markers = markers;
    this.primary = primary;
    for (var i = 0; i < markers.length; ++i)
      { markers[i].parent = this; }
  };

  SharedTextMarker.prototype.clear = function () {
    if (this.explicitlyCleared) { return }
    this.explicitlyCleared = true;
    for (var i = 0; i < this.markers.length; ++i)
      { this.markers[i].clear(); }
    signalLater(this, "clear");
  };

  SharedTextMarker.prototype.find = function (side, lineObj) {
    return this.primary.find(side, lineObj)
  };
  eventMixin(SharedTextMarker);

  function markTextShared(doc, from, to, options, type) {
    options = copyObj(options);
    options.shared = false;
    var markers = [markText(doc, from, to, options, type)], primary = markers[0];
    var widget = options.widgetNode;
    linkedDocs(doc, function (doc) {
      if (widget) { options.widgetNode = widget.cloneNode(true); }
      markers.push(markText(doc, clipPos(doc, from), clipPos(doc, to), options, type));
      for (var i = 0; i < doc.linked.length; ++i)
        { if (doc.linked[i].isParent) { return } }
      primary = lst(markers);
    });
    return new SharedTextMarker(markers, primary)
  }

  function findSharedMarkers(doc) {
    return doc.findMarks(Pos(doc.first, 0), doc.clipPos(Pos(doc.lastLine())), function (m) { return m.parent; })
  }

  function copySharedMarkers(doc, markers) {
    for (var i = 0; i < markers.length; i++) {
      var marker = markers[i], pos = marker.find();
      var mFrom = doc.clipPos(pos.from), mTo = doc.clipPos(pos.to);
      if (cmp(mFrom, mTo)) {
        var subMark = markText(doc, mFrom, mTo, marker.primary, marker.primary.type);
        marker.markers.push(subMark);
        subMark.parent = marker;
      }
    }
  }

  function detachSharedMarkers(markers) {
    var loop = function ( i ) {
      var marker = markers[i], linked = [marker.primary.doc];
      linkedDocs(marker.primary.doc, function (d) { return linked.push(d); });
      for (var j = 0; j < marker.markers.length; j++) {
        var subMarker = marker.markers[j];
        if (indexOf(linked, subMarker.doc) == -1) {
          subMarker.parent = null;
          marker.markers.splice(j--, 1);
        }
      }
    };

    for (var i = 0; i < markers.length; i++) loop( i );
  }

  var nextDocId = 0;
  var Doc = function(text, mode, firstLine, lineSep, direction) {
    if (!(this instanceof Doc)) { return new Doc(text, mode, firstLine, lineSep, direction) }
    if (firstLine == null) { firstLine = 0; }

    BranchChunk.call(this, [new LeafChunk([new Line("", null)])]);
    this.first = firstLine;
    this.scrollTop = this.scrollLeft = 0;
    this.cantEdit = false;
    this.cleanGeneration = 1;
    this.modeFrontier = this.highlightFrontier = firstLine;
    var start = Pos(firstLine, 0);
    this.sel = simpleSelection(start);
    this.history = new History(null);
    this.id = ++nextDocId;
    this.modeOption = mode;
    this.lineSep = lineSep;
    this.direction = (direction == "rtl") ? "rtl" : "ltr";
    this.extend = false;

    if (typeof text == "string") { text = this.splitLines(text); }
    updateDoc(this, {from: start, to: start, text: text});
    setSelection(this, simpleSelection(start), sel_dontScroll);
  };

  Doc.prototype = createObj(BranchChunk.prototype, {
    constructor: Doc,
    // Iterate over the document. Supports two forms -- with only one
    // argument, it calls that for each line in the document. With
    // three, it iterates over the range given by the first two (with
    // the second being non-inclusive).
    iter: function(from, to, op) {
      if (op) { this.iterN(from - this.first, to - from, op); }
      else { this.iterN(this.first, this.first + this.size, from); }
    },

    // Non-public interface for adding and removing lines.
    insert: function(at, lines) {
      var height = 0;
      for (var i = 0; i < lines.length; ++i) { height += lines[i].height; }
      this.insertInner(at - this.first, lines, height);
    },
    remove: function(at, n) { this.removeInner(at - this.first, n); },

    // From here, the methods are part of the public interface. Most
    // are also available from CodeMirror (editor) instances.

    getValue: function(lineSep) {
      var lines = getLines(this, this.first, this.first + this.size);
      if (lineSep === false) { return lines }
      return lines.join(lineSep || this.lineSeparator())
    },
    setValue: docMethodOp(function(code) {
      var top = Pos(this.first, 0), last = this.first + this.size - 1;
      makeChange(this, {from: top, to: Pos(last, getLine(this, last).text.length),
                        text: this.splitLines(code), origin: "setValue", full: true}, true);
      if (this.cm) { scrollToCoords(this.cm, 0, 0); }
      setSelection(this, simpleSelection(top), sel_dontScroll);
    }),
    replaceRange: function(code, from, to, origin) {
      from = clipPos(this, from);
      to = to ? clipPos(this, to) : from;
      replaceRange(this, code, from, to, origin);
    },
    getRange: function(from, to, lineSep) {
      var lines = getBetween(this, clipPos(this, from), clipPos(this, to));
      if (lineSep === false) { return lines }
      return lines.join(lineSep || this.lineSeparator())
    },

    getLine: function(line) {var l = this.getLineHandle(line); return l && l.text},

    getLineHandle: function(line) {if (isLine(this, line)) { return getLine(this, line) }},
    getLineNumber: function(line) {return lineNo(line)},

    getLineHandleVisualStart: function(line) {
      if (typeof line == "number") { line = getLine(this, line); }
      return visualLine(line)
    },

    lineCount: function() {return this.size},
    firstLine: function() {return this.first},
    lastLine: function() {return this.first + this.size - 1},

    clipPos: function(pos) {return clipPos(this, pos)},

    getCursor: function(start) {
      var range = this.sel.primary(), pos;
      if (start == null || start == "head") { pos = range.head; }
      else if (start == "anchor") { pos = range.anchor; }
      else if (start == "end" || start == "to" || start === false) { pos = range.to(); }
      else { pos = range.from(); }
      return pos
    },
    listSelections: function() { return this.sel.ranges },
    somethingSelected: function() {return this.sel.somethingSelected()},

    setCursor: docMethodOp(function(line, ch, options) {
      setSimpleSelection(this, clipPos(this, typeof line == "number" ? Pos(line, ch || 0) : line), null, options);
    }),
    setSelection: docMethodOp(function(anchor, head, options) {
      setSimpleSelection(this, clipPos(this, anchor), clipPos(this, head || anchor), options);
    }),
    extendSelection: docMethodOp(function(head, other, options) {
      extendSelection(this, clipPos(this, head), other && clipPos(this, other), options);
    }),
    extendSelections: docMethodOp(function(heads, options) {
      extendSelections(this, clipPosArray(this, heads), options);
    }),
    extendSelectionsBy: docMethodOp(function(f, options) {
      var heads = map(this.sel.ranges, f);
      extendSelections(this, clipPosArray(this, heads), options);
    }),
    setSelections: docMethodOp(function(ranges, primary, options) {
      if (!ranges.length) { return }
      var out = [];
      for (var i = 0; i < ranges.length; i++)
        { out[i] = new Range(clipPos(this, ranges[i].anchor),
                           clipPos(this, ranges[i].head)); }
      if (primary == null) { primary = Math.min(ranges.length - 1, this.sel.primIndex); }
      setSelection(this, normalizeSelection(this.cm, out, primary), options);
    }),
    addSelection: docMethodOp(function(anchor, head, options) {
      var ranges = this.sel.ranges.slice(0);
      ranges.push(new Range(clipPos(this, anchor), clipPos(this, head || anchor)));
      setSelection(this, normalizeSelection(this.cm, ranges, ranges.length - 1), options);
    }),

    getSelection: function(lineSep) {
      var ranges = this.sel.ranges, lines;
      for (var i = 0; i < ranges.length; i++) {
        var sel = getBetween(this, ranges[i].from(), ranges[i].to());
        lines = lines ? lines.concat(sel) : sel;
      }
      if (lineSep === false) { return lines }
      else { return lines.join(lineSep || this.lineSeparator()) }
    },
    getSelections: function(lineSep) {
      var parts = [], ranges = this.sel.ranges;
      for (var i = 0; i < ranges.length; i++) {
        var sel = getBetween(this, ranges[i].from(), ranges[i].to());
        if (lineSep !== false) { sel = sel.join(lineSep || this.lineSeparator()); }
        parts[i] = sel;
      }
      return parts
    },
    replaceSelection: function(code, collapse, origin) {
      var dup = [];
      for (var i = 0; i < this.sel.ranges.length; i++)
        { dup[i] = code; }
      this.replaceSelections(dup, collapse, origin || "+input");
    },
    replaceSelections: docMethodOp(function(code, collapse, origin) {
      var changes = [], sel = this.sel;
      for (var i = 0; i < sel.ranges.length; i++) {
        var range = sel.ranges[i];
        changes[i] = {from: range.from(), to: range.to(), text: this.splitLines(code[i]), origin: origin};
      }
      var newSel = collapse && collapse != "end" && computeReplacedSel(this, changes, collapse);
      for (var i$1 = changes.length - 1; i$1 >= 0; i$1--)
        { makeChange(this, changes[i$1]); }
      if (newSel) { setSelectionReplaceHistory(this, newSel); }
      else if (this.cm) { ensureCursorVisible(this.cm); }
    }),
    undo: docMethodOp(function() {makeChangeFromHistory(this, "undo");}),
    redo: docMethodOp(function() {makeChangeFromHistory(this, "redo");}),
    undoSelection: docMethodOp(function() {makeChangeFromHistory(this, "undo", true);}),
    redoSelection: docMethodOp(function() {makeChangeFromHistory(this, "redo", true);}),

    setExtending: function(val) {this.extend = val;},
    getExtending: function() {return this.extend},

    historySize: function() {
      var hist = this.history, done = 0, undone = 0;
      for (var i = 0; i < hist.done.length; i++) { if (!hist.done[i].ranges) { ++done; } }
      for (var i$1 = 0; i$1 < hist.undone.length; i$1++) { if (!hist.undone[i$1].ranges) { ++undone; } }
      return {undo: done, redo: undone}
    },
    clearHistory: function() {
      var this$1 = this;

      this.history = new History(this.history.maxGeneration);
      linkedDocs(this, function (doc) { return doc.history = this$1.history; }, true);
    },

    markClean: function() {
      this.cleanGeneration = this.changeGeneration(true);
    },
    changeGeneration: function(forceSplit) {
      if (forceSplit)
        { this.history.lastOp = this.history.lastSelOp = this.history.lastOrigin = null; }
      return this.history.generation
    },
    isClean: function (gen) {
      return this.history.generation == (gen || this.cleanGeneration)
    },

    getHistory: function() {
      return {done: copyHistoryArray(this.history.done),
              undone: copyHistoryArray(this.history.undone)}
    },
    setHistory: function(histData) {
      var hist = this.history = new History(this.history.maxGeneration);
      hist.done = copyHistoryArray(histData.done.slice(0), null, true);
      hist.undone = copyHistoryArray(histData.undone.slice(0), null, true);
    },

    setGutterMarker: docMethodOp(function(line, gutterID, value) {
      return changeLine(this, line, "gutter", function (line) {
        var markers = line.gutterMarkers || (line.gutterMarkers = {});
        markers[gutterID] = value;
        if (!value && isEmpty(markers)) { line.gutterMarkers = null; }
        return true
      })
    }),

    clearGutter: docMethodOp(function(gutterID) {
      var this$1 = this;

      this.iter(function (line) {
        if (line.gutterMarkers && line.gutterMarkers[gutterID]) {
          changeLine(this$1, line, "gutter", function () {
            line.gutterMarkers[gutterID] = null;
            if (isEmpty(line.gutterMarkers)) { line.gutterMarkers = null; }
            return true
          });
        }
      });
    }),

    lineInfo: function(line) {
      var n;
      if (typeof line == "number") {
        if (!isLine(this, line)) { return null }
        n = line;
        line = getLine(this, line);
        if (!line) { return null }
      } else {
        n = lineNo(line);
        if (n == null) { return null }
      }
      return {line: n, handle: line, text: line.text, gutterMarkers: line.gutterMarkers,
              textClass: line.textClass, bgClass: line.bgClass, wrapClass: line.wrapClass,
              widgets: line.widgets}
    },

    addLineClass: docMethodOp(function(handle, where, cls) {
      return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function (line) {
        var prop = where == "text" ? "textClass"
                 : where == "background" ? "bgClass"
                 : where == "gutter" ? "gutterClass" : "wrapClass";
        if (!line[prop]) { line[prop] = cls; }
        else if (classTest(cls).test(line[prop])) { return false }
        else { line[prop] += " " + cls; }
        return true
      })
    }),
    removeLineClass: docMethodOp(function(handle, where, cls) {
      return changeLine(this, handle, where == "gutter" ? "gutter" : "class", function (line) {
        var prop = where == "text" ? "textClass"
                 : where == "background" ? "bgClass"
                 : where == "gutter" ? "gutterClass" : "wrapClass";
        var cur = line[prop];
        if (!cur) { return false }
        else if (cls == null) { line[prop] = null; }
        else {
          var found = cur.match(classTest(cls));
          if (!found) { return false }
          var end = found.index + found[0].length;
          line[prop] = cur.slice(0, found.index) + (!found.index || end == cur.length ? "" : " ") + cur.slice(end) || null;
        }
        return true
      })
    }),

    addLineWidget: docMethodOp(function(handle, node, options) {
      return addLineWidget(this, handle, node, options)
    }),
    removeLineWidget: function(widget) { widget.clear(); },

    markText: function(from, to, options) {
      return markText(this, clipPos(this, from), clipPos(this, to), options, options && options.type || "range")
    },
    setBookmark: function(pos, options) {
      var realOpts = {replacedWith: options && (options.nodeType == null ? options.widget : options),
                      insertLeft: options && options.insertLeft,
                      clearWhenEmpty: false, shared: options && options.shared,
                      handleMouseEvents: options && options.handleMouseEvents};
      pos = clipPos(this, pos);
      return markText(this, pos, pos, realOpts, "bookmark")
    },
    findMarksAt: function(pos) {
      pos = clipPos(this, pos);
      var markers = [], spans = getLine(this, pos.line).markedSpans;
      if (spans) { for (var i = 0; i < spans.length; ++i) {
        var span = spans[i];
        if ((span.from == null || span.from <= pos.ch) &&
            (span.to == null || span.to >= pos.ch))
          { markers.push(span.marker.parent || span.marker); }
      } }
      return markers
    },
    findMarks: function(from, to, filter) {
      from = clipPos(this, from); to = clipPos(this, to);
      var found = [], lineNo = from.line;
      this.iter(from.line, to.line + 1, function (line) {
        var spans = line.markedSpans;
        if (spans) { for (var i = 0; i < spans.length; i++) {
          var span = spans[i];
          if (!(span.to != null && lineNo == from.line && from.ch >= span.to ||
                span.from == null && lineNo != from.line ||
                span.from != null && lineNo == to.line && span.from >= to.ch) &&
              (!filter || filter(span.marker)))
            { found.push(span.marker.parent || span.marker); }
        } }
        ++lineNo;
      });
      return found
    },
    getAllMarks: function() {
      var markers = [];
      this.iter(function (line) {
        var sps = line.markedSpans;
        if (sps) { for (var i = 0; i < sps.length; ++i)
          { if (sps[i].from != null) { markers.push(sps[i].marker); } } }
      });
      return markers
    },

    posFromIndex: function(off) {
      var ch, lineNo = this.first, sepSize = this.lineSeparator().length;
      this.iter(function (line) {
        var sz = line.text.length + sepSize;
        if (sz > off) { ch = off; return true }
        off -= sz;
        ++lineNo;
      });
      return clipPos(this, Pos(lineNo, ch))
    },
    indexFromPos: function (coords) {
      coords = clipPos(this, coords);
      var index = coords.ch;
      if (coords.line < this.first || coords.ch < 0) { return 0 }
      var sepSize = this.lineSeparator().length;
      this.iter(this.first, coords.line, function (line) { // iter aborts when callback returns a truthy value
        index += line.text.length + sepSize;
      });
      return index
    },

    copy: function(copyHistory) {
      var doc = new Doc(getLines(this, this.first, this.first + this.size),
                        this.modeOption, this.first, this.lineSep, this.direction);
      doc.scrollTop = this.scrollTop; doc.scrollLeft = this.scrollLeft;
      doc.sel = this.sel;
      doc.extend = false;
      if (copyHistory) {
        doc.history.undoDepth = this.history.undoDepth;
        doc.setHistory(this.getHistory());
      }
      return doc
    },

    linkedDoc: function(options) {
      if (!options) { options = {}; }
      var from = this.first, to = this.first + this.size;
      if (options.from != null && options.from > from) { from = options.from; }
      if (options.to != null && options.to < to) { to = options.to; }
      var copy = new Doc(getLines(this, from, to), options.mode || this.modeOption, from, this.lineSep, this.direction);
      if (options.sharedHist) { copy.history = this.history
      ; }(this.linked || (this.linked = [])).push({doc: copy, sharedHist: options.sharedHist});
      copy.linked = [{doc: this, isParent: true, sharedHist: options.sharedHist}];
      copySharedMarkers(copy, findSharedMarkers(this));
      return copy
    },
    unlinkDoc: function(other) {
      if (other instanceof CodeMirror) { other = other.doc; }
      if (this.linked) { for (var i = 0; i < this.linked.length; ++i) {
        var link = this.linked[i];
        if (link.doc != other) { continue }
        this.linked.splice(i, 1);
        other.unlinkDoc(this);
        detachSharedMarkers(findSharedMarkers(this));
        break
      } }
      // If the histories were shared, split them again
      if (other.history == this.history) {
        var splitIds = [other.id];
        linkedDocs(other, function (doc) { return splitIds.push(doc.id); }, true);
        other.history = new History(null);
        other.history.done = copyHistoryArray(this.history.done, splitIds);
        other.history.undone = copyHistoryArray(this.history.undone, splitIds);
      }
    },
    iterLinkedDocs: function(f) {linkedDocs(this, f);},

    getMode: function() {return this.mode},
    getEditor: function() {return this.cm},

    splitLines: function(str) {
      if (this.lineSep) { return str.split(this.lineSep) }
      return splitLinesAuto(str)
    },
    lineSeparator: function() { return this.lineSep || "\n" },

    setDirection: docMethodOp(function (dir) {
      if (dir != "rtl") { dir = "ltr"; }
      if (dir == this.direction) { return }
      this.direction = dir;
      this.iter(function (line) { return line.order = null; });
      if (this.cm) { directionChanged(this.cm); }
    })
  });

  // Public alias.
  Doc.prototype.eachLine = Doc.prototype.iter;

  // Kludge to work around strange IE behavior where it'll sometimes
  // re-fire a series of drag-related events right after the drop (#1551)
  var lastDrop = 0;

  function onDrop(e) {
    var cm = this;
    clearDragCursor(cm);
    if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e))
      { return }
    e_preventDefault(e);
    if (ie) { lastDrop = +new Date; }
    var pos = posFromMouse(cm, e, true), files = e.dataTransfer.files;
    if (!pos || cm.isReadOnly()) { return }
    // Might be a file drop, in which case we simply extract the text
    // and insert it.
    if (files && files.length && window.FileReader && window.File) {
      var n = files.length, text = Array(n), read = 0;
      var markAsReadAndPasteIfAllFilesAreRead = function () {
        if (++read == n) {
          operation(cm, function () {
            pos = clipPos(cm.doc, pos);
            var change = {from: pos, to: pos,
                          text: cm.doc.splitLines(
                              text.filter(function (t) { return t != null; }).join(cm.doc.lineSeparator())),
                          origin: "paste"};
            makeChange(cm.doc, change);
            setSelectionReplaceHistory(cm.doc, simpleSelection(clipPos(cm.doc, pos), clipPos(cm.doc, changeEnd(change))));
          })();
        }
      };
      var readTextFromFile = function (file, i) {
        if (cm.options.allowDropFileTypes &&
            indexOf(cm.options.allowDropFileTypes, file.type) == -1) {
          markAsReadAndPasteIfAllFilesAreRead();
          return
        }
        var reader = new FileReader;
        reader.onerror = function () { return markAsReadAndPasteIfAllFilesAreRead(); };
        reader.onload = function () {
          var content = reader.result;
          if (/[\x00-\x08\x0e-\x1f]{2}/.test(content)) {
            markAsReadAndPasteIfAllFilesAreRead();
            return
          }
          text[i] = content;
          markAsReadAndPasteIfAllFilesAreRead();
        };
        reader.readAsText(file);
      };
      for (var i = 0; i < files.length; i++) { readTextFromFile(files[i], i); }
    } else { // Normal drop
      // Don't do a replace if the drop happened inside of the selected text.
      if (cm.state.draggingText && cm.doc.sel.contains(pos) > -1) {
        cm.state.draggingText(e);
        // Ensure the editor is re-focused
        setTimeout(function () { return cm.display.input.focus(); }, 20);
        return
      }
      try {
        var text$1 = e.dataTransfer.getData("Text");
        if (text$1) {
          var selected;
          if (cm.state.draggingText && !cm.state.draggingText.copy)
            { selected = cm.listSelections(); }
          setSelectionNoUndo(cm.doc, simpleSelection(pos, pos));
          if (selected) { for (var i$1 = 0; i$1 < selected.length; ++i$1)
            { replaceRange(cm.doc, "", selected[i$1].anchor, selected[i$1].head, "drag"); } }
          cm.replaceSelection(text$1, "around", "paste");
          cm.display.input.focus();
        }
      }
      catch(e){}
    }
  }

  function onDragStart(cm, e) {
    if (ie && (!cm.state.draggingText || +new Date - lastDrop < 100)) { e_stop(e); return }
    if (signalDOMEvent(cm, e) || eventInWidget(cm.display, e)) { return }

    e.dataTransfer.setData("Text", cm.getSelection());
    e.dataTransfer.effectAllowed = "copyMove";

    // Use dummy image instead of default browsers image.
    // Recent Safari (~6.0.2) have a tendency to segfault when this happens, so we don't do it there.
    if (e.dataTransfer.setDragImage && !safari) {
      var img = elt("img", null, null, "position: fixed; left: 0; top: 0;");
      img.src = "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==";
      if (presto) {
        img.width = img.height = 1;
        cm.display.wrapper.appendChild(img);
        // Force a relayout, or Opera won't use our image for some obscure reason
        img._top = img.offsetTop;
      }
      e.dataTransfer.setDragImage(img, 0, 0);
      if (presto) { img.parentNode.removeChild(img); }
    }
  }

  function onDragOver(cm, e) {
    var pos = posFromMouse(cm, e);
    if (!pos) { return }
    var frag = document.createDocumentFragment();
    drawSelectionCursor(cm, pos, frag);
    if (!cm.display.dragCursor) {
      cm.display.dragCursor = elt("div", null, "CodeMirror-cursors CodeMirror-dragcursors");
      cm.display.lineSpace.insertBefore(cm.display.dragCursor, cm.display.cursorDiv);
    }
    removeChildrenAndAdd(cm.display.dragCursor, frag);
  }

  function clearDragCursor(cm) {
    if (cm.display.dragCursor) {
      cm.display.lineSpace.removeChild(cm.display.dragCursor);
      cm.display.dragCursor = null;
    }
  }

  // These must be handled carefully, because naively registering a
  // handler for each editor will cause the editors to never be
  // garbage collected.

  function forEachCodeMirror(f) {
    if (!document.getElementsByClassName) { return }
    var byClass = document.getElementsByClassName("CodeMirror"), editors = [];
    for (var i = 0; i < byClass.length; i++) {
      var cm = byClass[i].CodeMirror;
      if (cm) { editors.push(cm); }
    }
    if (editors.length) { editors[0].operation(function () {
      for (var i = 0; i < editors.length; i++) { f(editors[i]); }
    }); }
  }

  var globalsRegistered = false;
  function ensureGlobalHandlers() {
    if (globalsRegistered) { return }
    registerGlobalHandlers();
    globalsRegistered = true;
  }
  function registerGlobalHandlers() {
    // When the window resizes, we need to refresh active editors.
    var resizeTimer;
    on(window, "resize", function () {
      if (resizeTimer == null) { resizeTimer = setTimeout(function () {
        resizeTimer = null;
        forEachCodeMirror(onResize);
      }, 100); }
    });
    // When the window loses focus, we want to show the editor as blurred
    on(window, "blur", function () { return forEachCodeMirror(onBlur); });
  }
  // Called when the window resizes
  function onResize(cm) {
    var d = cm.display;
    // Might be a text scaling operation, clear size caches.
    d.cachedCharWidth = d.cachedTextHeight = d.cachedPaddingH = null;
    d.scrollbarsClipped = false;
    cm.setSize();
  }

  var keyNames = {
    3: "Pause", 8: "Backspace", 9: "Tab", 13: "Enter", 16: "Shift", 17: "Ctrl", 18: "Alt",
    19: "Pause", 20: "CapsLock", 27: "Esc", 32: "Space", 33: "PageUp", 34: "PageDown", 35: "End",
    36: "Home", 37: "Left", 38: "Up", 39: "Right", 40: "Down", 44: "PrintScrn", 45: "Insert",
    46: "Delete", 59: ";", 61: "=", 91: "Mod", 92: "Mod", 93: "Mod",
    106: "*", 107: "=", 109: "-", 110: ".", 111: "/", 145: "ScrollLock",
    173: "-", 186: ";", 187: "=", 188: ",", 189: "-", 190: ".", 191: "/", 192: "`", 219: "[", 220: "\\",
    221: "]", 222: "'", 63232: "Up", 63233: "Down", 63234: "Left", 63235: "Right", 63272: "Delete",
    63273: "Home", 63275: "End", 63276: "PageUp", 63277: "PageDown", 63302: "Insert"
  };

  // Number keys
  for (var i = 0; i < 10; i++) { keyNames[i + 48] = keyNames[i + 96] = String(i); }
  // Alphabetic keys
  for (var i$1 = 65; i$1 <= 90; i$1++) { keyNames[i$1] = String.fromCharCode(i$1); }
  // Function keys
  for (var i$2 = 1; i$2 <= 12; i$2++) { keyNames[i$2 + 111] = keyNames[i$2 + 63235] = "F" + i$2; }

  var keyMap = {};

  keyMap.basic = {
    "Left": "goCharLeft", "Right": "goCharRight", "Up": "goLineUp", "Down": "goLineDown",
    "End": "goLineEnd", "Home": "goLineStartSmart", "PageUp": "goPageUp", "PageDown": "goPageDown",
    "Delete": "delCharAfter", "Backspace": "delCharBefore", "Shift-Backspace": "delCharBefore",
    "Tab": "defaultTab", "Shift-Tab": "indentAuto",
    "Enter": "newlineAndIndent", "Insert": "toggleOverwrite",
    "Esc": "singleSelection"
  };
  // Note that the save and find-related commands aren't defined by
  // default. User code or addons can define them. Unknown commands
  // are simply ignored.
  keyMap.pcDefault = {
    "Ctrl-A": "selectAll", "Ctrl-D": "deleteLine", "Ctrl-Z": "undo", "Shift-Ctrl-Z": "redo", "Ctrl-Y": "redo",
    "Ctrl-Home": "goDocStart", "Ctrl-End": "goDocEnd", "Ctrl-Up": "goLineUp", "Ctrl-Down": "goLineDown",
    "Ctrl-Left": "goGroupLeft", "Ctrl-Right": "goGroupRight", "Alt-Left": "goLineStart", "Alt-Right": "goLineEnd",
    "Ctrl-Backspace": "delGroupBefore", "Ctrl-Delete": "delGroupAfter", "Ctrl-S": "save", "Ctrl-F": "find",
    "Ctrl-G": "findNext", "Shift-Ctrl-G": "findPrev", "Shift-Ctrl-F": "replace", "Shift-Ctrl-R": "replaceAll",
    "Ctrl-[": "indentLess", "Ctrl-]": "indentMore",
    "Ctrl-U": "undoSelection", "Shift-Ctrl-U": "redoSelection", "Alt-U": "redoSelection",
    "fallthrough": "basic"
  };
  // Very basic readline/emacs-style bindings, which are standard on Mac.
  keyMap.emacsy = {
    "Ctrl-F": "goCharRight", "Ctrl-B": "goCharLeft", "Ctrl-P": "goLineUp", "Ctrl-N": "goLineDown",
    "Alt-F": "goWordRight", "Alt-B": "goWordLeft", "Ctrl-A": "goLineStart", "Ctrl-E": "goLineEnd",
    "Ctrl-V": "goPageDown", "Shift-Ctrl-V": "goPageUp", "Ctrl-D": "delCharAfter", "Ctrl-H": "delCharBefore",
    "Alt-D": "delWordAfter", "Alt-Backspace": "delWordBefore", "Ctrl-K": "killLine", "Ctrl-T": "transposeChars",
    "Ctrl-O": "openLine"
  };
  keyMap.macDefault = {
    "Cmd-A": "selectAll", "Cmd-D": "deleteLine", "Cmd-Z": "undo", "Shift-Cmd-Z": "redo", "Cmd-Y": "redo",
    "Cmd-Home": "goDocStart", "Cmd-Up": "goDocStart", "Cmd-End": "goDocEnd", "Cmd-Down": "goDocEnd", "Alt-Left": "goGroupLeft",
    "Alt-Right": "goGroupRight", "Cmd-Left": "goLineLeft", "Cmd-Right": "goLineRight", "Alt-Backspace": "delGroupBefore",
    "Ctrl-Alt-Backspace": "delGroupAfter", "Alt-Delete": "delGroupAfter", "Cmd-S": "save", "Cmd-F": "find",
    "Cmd-G": "findNext", "Shift-Cmd-G": "findPrev", "Cmd-Alt-F": "replace", "Shift-Cmd-Alt-F": "replaceAll",
    "Cmd-[": "indentLess", "Cmd-]": "indentMore", "Cmd-Backspace": "delWrappedLineLeft", "Cmd-Delete": "delWrappedLineRight",
    "Cmd-U": "undoSelection", "Shift-Cmd-U": "redoSelection", "Ctrl-Up": "goDocStart", "Ctrl-Down": "goDocEnd",
    "fallthrough": ["basic", "emacsy"]
  };
  keyMap["default"] = mac ? keyMap.macDefault : keyMap.pcDefault;

  // KEYMAP DISPATCH

  function normalizeKeyName(name) {
    var parts = name.split(/-(?!$)/);
    name = parts[parts.length - 1];
    var alt, ctrl, shift, cmd;
    for (var i = 0; i < parts.length - 1; i++) {
      var mod = parts[i];
      if (/^(cmd|meta|m)$/i.test(mod)) { cmd = true; }
      else if (/^a(lt)?$/i.test(mod)) { alt = true; }
      else if (/^(c|ctrl|control)$/i.test(mod)) { ctrl = true; }
      else if (/^s(hift)?$/i.test(mod)) { shift = true; }
      else { throw new Error("Unrecognized modifier name: " + mod) }
    }
    if (alt) { name = "Alt-" + name; }
    if (ctrl) { name = "Ctrl-" + name; }
    if (cmd) { name = "Cmd-" + name; }
    if (shift) { name = "Shift-" + name; }
    return name
  }

  // This is a kludge to keep keymaps mostly working as raw objects
  // (backwards compatibility) while at the same time support features
  // like normalization and multi-stroke key bindings. It compiles a
  // new normalized keymap, and then updates the old object to reflect
  // this.
  function normalizeKeyMap(keymap) {
    var copy = {};
    for (var keyname in keymap) { if (keymap.hasOwnProperty(keyname)) {
      var value = keymap[keyname];
      if (/^(name|fallthrough|(de|at)tach)$/.test(keyname)) { continue }
      if (value == "...") { delete keymap[keyname]; continue }

      var keys = map(keyname.split(" "), normalizeKeyName);
      for (var i = 0; i < keys.length; i++) {
        var val = (void 0), name = (void 0);
        if (i == keys.length - 1) {
          name = keys.join(" ");
          val = value;
        } else {
          name = keys.slice(0, i + 1).join(" ");
          val = "...";
        }
        var prev = copy[name];
        if (!prev) { copy[name] = val; }
        else if (prev != val) { throw new Error("Inconsistent bindings for " + name) }
      }
      delete keymap[keyname];
    } }
    for (var prop in copy) { keymap[prop] = copy[prop]; }
    return keymap
  }

  function lookupKey(key, map, handle, context) {
    map = getKeyMap(map);
    var found = map.call ? map.call(key, context) : map[key];
    if (found === false) { return "nothing" }
    if (found === "...") { return "multi" }
    if (found != null && handle(found)) { return "handled" }

    if (map.fallthrough) {
      if (Object.prototype.toString.call(map.fallthrough) != "[object Array]")
        { return lookupKey(key, map.fallthrough, handle, context) }
      for (var i = 0; i < map.fallthrough.length; i++) {
        var result = lookupKey(key, map.fallthrough[i], handle, context);
        if (result) { return result }
      }
    }
  }

  // Modifier key presses don't count as 'real' key presses for the
  // purpose of keymap fallthrough.
  function isModifierKey(value) {
    var name = typeof value == "string" ? value : keyNames[value.keyCode];
    return name == "Ctrl" || name == "Alt" || name == "Shift" || name == "Mod"
  }

  function addModifierNames(name, event, noShift) {
    var base = name;
    if (event.altKey && base != "Alt") { name = "Alt-" + name; }
    if ((flipCtrlCmd ? event.metaKey : event.ctrlKey) && base != "Ctrl") { name = "Ctrl-" + name; }
    if ((flipCtrlCmd ? event.ctrlKey : event.metaKey) && base != "Cmd") { name = "Cmd-" + name; }
    if (!noShift && event.shiftKey && base != "Shift") { name = "Shift-" + name; }
    return name
  }

  // Look up the name of a key as indicated by an event object.
  function keyName(event, noShift) {
    if (presto && event.keyCode == 34 && event["char"]) { return false }
    var name = keyNames[event.keyCode];
    if (name == null || event.altGraphKey) { return false }
    // Ctrl-ScrollLock has keyCode 3, same as Ctrl-Pause,
    // so we'll use event.code when available (Chrome 48+, FF 38+, Safari 10.1+)
    if (event.keyCode == 3 && event.code) { name = event.code; }
    return addModifierNames(name, event, noShift)
  }

  function getKeyMap(val) {
    return typeof val == "string" ? keyMap[val] : val
  }

  // Helper for deleting text near the selection(s), used to implement
  // backspace, delete, and similar functionality.
  function deleteNearSelection(cm, compute) {
    var ranges = cm.doc.sel.ranges, kill = [];
    // Build up a set of ranges to kill first, merging overlapping
    // ranges.
    for (var i = 0; i < ranges.length; i++) {
      var toKill = compute(ranges[i]);
      while (kill.length && cmp(toKill.from, lst(kill).to) <= 0) {
        var replaced = kill.pop();
        if (cmp(replaced.from, toKill.from) < 0) {
          toKill.from = replaced.from;
          break
        }
      }
      kill.push(toKill);
    }
    // Next, remove those actual ranges.
    runInOp(cm, function () {
      for (var i = kill.length - 1; i >= 0; i--)
        { replaceRange(cm.doc, "", kill[i].from, kill[i].to, "+delete"); }
      ensureCursorVisible(cm);
    });
  }

  function moveCharLogically(line, ch, dir) {
    var target = skipExtendingChars(line.text, ch + dir, dir);
    return target < 0 || target > line.text.length ? null : target
  }

  function moveLogically(line, start, dir) {
    var ch = moveCharLogically(line, start.ch, dir);
    return ch == null ? null : new Pos(start.line, ch, dir < 0 ? "after" : "before")
  }

  function endOfLine(visually, cm, lineObj, lineNo, dir) {
    if (visually) {
      if (cm.doc.direction == "rtl") { dir = -dir; }
      var order = getOrder(lineObj, cm.doc.direction);
      if (order) {
        var part = dir < 0 ? lst(order) : order[0];
        var moveInStorageOrder = (dir < 0) == (part.level == 1);
        var sticky = moveInStorageOrder ? "after" : "before";
        var ch;
        // With a wrapped rtl chunk (possibly spanning multiple bidi parts),
        // it could be that the last bidi part is not on the last visual line,
        // since visual lines contain content order-consecutive chunks.
        // Thus, in rtl, we are looking for the first (content-order) character
        // in the rtl chunk that is on the last line (that is, the same line
        // as the last (content-order) character).
        if (part.level > 0 || cm.doc.direction == "rtl") {
          var prep = prepareMeasureForLine(cm, lineObj);
          ch = dir < 0 ? lineObj.text.length - 1 : 0;
          var targetTop = measureCharPrepared(cm, prep, ch).top;
          ch = findFirst(function (ch) { return measureCharPrepared(cm, prep, ch).top == targetTop; }, (dir < 0) == (part.level == 1) ? part.from : part.to - 1, ch);
          if (sticky == "before") { ch = moveCharLogically(lineObj, ch, 1); }
        } else { ch = dir < 0 ? part.to : part.from; }
        return new Pos(lineNo, ch, sticky)
      }
    }
    return new Pos(lineNo, dir < 0 ? lineObj.text.length : 0, dir < 0 ? "before" : "after")
  }

  function moveVisually(cm, line, start, dir) {
    var bidi = getOrder(line, cm.doc.direction);
    if (!bidi) { return moveLogically(line, start, dir) }
    if (start.ch >= line.text.length) {
      start.ch = line.text.length;
      start.sticky = "before";
    } else if (start.ch <= 0) {
      start.ch = 0;
      start.sticky = "after";
    }
    var partPos = getBidiPartAt(bidi, start.ch, start.sticky), part = bidi[partPos];
    if (cm.doc.direction == "ltr" && part.level % 2 == 0 && (dir > 0 ? part.to > start.ch : part.from < start.ch)) {
      // Case 1: We move within an ltr part in an ltr editor. Even with wrapped lines,
      // nothing interesting happens.
      return moveLogically(line, start, dir)
    }

    var mv = function (pos, dir) { return moveCharLogically(line, pos instanceof Pos ? pos.ch : pos, dir); };
    var prep;
    var getWrappedLineExtent = function (ch) {
      if (!cm.options.lineWrapping) { return {begin: 0, end: line.text.length} }
      prep = prep || prepareMeasureForLine(cm, line);
      return wrappedLineExtentChar(cm, line, prep, ch)
    };
    var wrappedLineExtent = getWrappedLineExtent(start.sticky == "before" ? mv(start, -1) : start.ch);

    if (cm.doc.direction == "rtl" || part.level == 1) {
      var moveInStorageOrder = (part.level == 1) == (dir < 0);
      var ch = mv(start, moveInStorageOrder ? 1 : -1);
      if (ch != null && (!moveInStorageOrder ? ch >= part.from && ch >= wrappedLineExtent.begin : ch <= part.to && ch <= wrappedLineExtent.end)) {
        // Case 2: We move within an rtl part or in an rtl editor on the same visual line
        var sticky = moveInStorageOrder ? "before" : "after";
        return new Pos(start.line, ch, sticky)
      }
    }

    // Case 3: Could not move within this bidi part in this visual line, so leave
    // the current bidi part

    var searchInVisualLine = function (partPos, dir, wrappedLineExtent) {
      var getRes = function (ch, moveInStorageOrder) { return moveInStorageOrder
        ? new Pos(start.line, mv(ch, 1), "before")
        : new Pos(start.line, ch, "after"); };

      for (; partPos >= 0 && partPos < bidi.length; partPos += dir) {
        var part = bidi[partPos];
        var moveInStorageOrder = (dir > 0) == (part.level != 1);
        var ch = moveInStorageOrder ? wrappedLineExtent.begin : mv(wrappedLineExtent.end, -1);
        if (part.from <= ch && ch < part.to) { return getRes(ch, moveInStorageOrder) }
        ch = moveInStorageOrder ? part.from : mv(part.to, -1);
        if (wrappedLineExtent.begin <= ch && ch < wrappedLineExtent.end) { return getRes(ch, moveInStorageOrder) }
      }
    };

    // Case 3a: Look for other bidi parts on the same visual line
    var res = searchInVisualLine(partPos + dir, dir, wrappedLineExtent);
    if (res) { return res }

    // Case 3b: Look for other bidi parts on the next visual line
    var nextCh = dir > 0 ? wrappedLineExtent.end : mv(wrappedLineExtent.begin, -1);
    if (nextCh != null && !(dir > 0 && nextCh == line.text.length)) {
      res = searchInVisualLine(dir > 0 ? 0 : bidi.length - 1, dir, getWrappedLineExtent(nextCh));
      if (res) { return res }
    }

    // Case 4: Nowhere to move
    return null
  }

  // Commands are parameter-less actions that can be performed on an
  // editor, mostly used for keybindings.
  var commands = {
    selectAll: selectAll,
    singleSelection: function (cm) { return cm.setSelection(cm.getCursor("anchor"), cm.getCursor("head"), sel_dontScroll); },
    killLine: function (cm) { return deleteNearSelection(cm, function (range) {
      if (range.empty()) {
        var len = getLine(cm.doc, range.head.line).text.length;
        if (range.head.ch == len && range.head.line < cm.lastLine())
          { return {from: range.head, to: Pos(range.head.line + 1, 0)} }
        else
          { return {from: range.head, to: Pos(range.head.line, len)} }
      } else {
        return {from: range.from(), to: range.to()}
      }
    }); },
    deleteLine: function (cm) { return deleteNearSelection(cm, function (range) { return ({
      from: Pos(range.from().line, 0),
      to: clipPos(cm.doc, Pos(range.to().line + 1, 0))
    }); }); },
    delLineLeft: function (cm) { return deleteNearSelection(cm, function (range) { return ({
      from: Pos(range.from().line, 0), to: range.from()
    }); }); },
    delWrappedLineLeft: function (cm) { return deleteNearSelection(cm, function (range) {
      var top = cm.charCoords(range.head, "div").top + 5;
      var leftPos = cm.coordsChar({left: 0, top: top}, "div");
      return {from: leftPos, to: range.from()}
    }); },
    delWrappedLineRight: function (cm) { return deleteNearSelection(cm, function (range) {
      var top = cm.charCoords(range.head, "div").top + 5;
      var rightPos = cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div");
      return {from: range.from(), to: rightPos }
    }); },
    undo: function (cm) { return cm.undo(); },
    redo: function (cm) { return cm.redo(); },
    undoSelection: function (cm) { return cm.undoSelection(); },
    redoSelection: function (cm) { return cm.redoSelection(); },
    goDocStart: function (cm) { return cm.extendSelection(Pos(cm.firstLine(), 0)); },
    goDocEnd: function (cm) { return cm.extendSelection(Pos(cm.lastLine())); },
    goLineStart: function (cm) { return cm.extendSelectionsBy(function (range) { return lineStart(cm, range.head.line); },
      {origin: "+move", bias: 1}
    ); },
    goLineStartSmart: function (cm) { return cm.extendSelectionsBy(function (range) { return lineStartSmart(cm, range.head); },
      {origin: "+move", bias: 1}
    ); },
    goLineEnd: function (cm) { return cm.extendSelectionsBy(function (range) { return lineEnd(cm, range.head.line); },
      {origin: "+move", bias: -1}
    ); },
    goLineRight: function (cm) { return cm.extendSelectionsBy(function (range) {
      var top = cm.cursorCoords(range.head, "div").top + 5;
      return cm.coordsChar({left: cm.display.lineDiv.offsetWidth + 100, top: top}, "div")
    }, sel_move); },
    goLineLeft: function (cm) { return cm.extendSelectionsBy(function (range) {
      var top = cm.cursorCoords(range.head, "div").top + 5;
      return cm.coordsChar({left: 0, top: top}, "div")
    }, sel_move); },
    goLineLeftSmart: function (cm) { return cm.extendSelectionsBy(function (range) {
      var top = cm.cursorCoords(range.head, "div").top + 5;
      var pos = cm.coordsChar({left: 0, top: top}, "div");
      if (pos.ch < cm.getLine(pos.line).search(/\S/)) { return lineStartSmart(cm, range.head) }
      return pos
    }, sel_move); },
    goLineUp: function (cm) { return cm.moveV(-1, "line"); },
    goLineDown: function (cm) { return cm.moveV(1, "line"); },
    goPageUp: function (cm) { return cm.moveV(-1, "page"); },
    goPageDown: function (cm) { return cm.moveV(1, "page"); },
    goCharLeft: function (cm) { return cm.moveH(-1, "char"); },
    goCharRight: function (cm) { return cm.moveH(1, "char"); },
    goColumnLeft: function (cm) { return cm.moveH(-1, "column"); },
    goColumnRight: function (cm) { return cm.moveH(1, "column"); },
    goWordLeft: function (cm) { return cm.moveH(-1, "word"); },
    goGroupRight: function (cm) { return cm.moveH(1, "group"); },
    goGroupLeft: function (cm) { return cm.moveH(-1, "group"); },
    goWordRight: function (cm) { return cm.moveH(1, "word"); },
    delCharBefore: function (cm) { return cm.deleteH(-1, "char"); },
    delCharAfter: function (cm) { return cm.deleteH(1, "char"); },
    delWordBefore: function (cm) { return cm.deleteH(-1, "word"); },
    delWordAfter: function (cm) { return cm.deleteH(1, "word"); },
    delGroupBefore: function (cm) { return cm.deleteH(-1, "group"); },
    delGroupAfter: function (cm) { return cm.deleteH(1, "group"); },
    indentAuto: function (cm) { return cm.indentSelection("smart"); },
    indentMore: function (cm) { return cm.indentSelection("add"); },
    indentLess: function (cm) { return cm.indentSelection("subtract"); },
    insertTab: function (cm) { return cm.replaceSelection("\t"); },
    insertSoftTab: function (cm) {
      var spaces = [], ranges = cm.listSelections(), tabSize = cm.options.tabSize;
      for (var i = 0; i < ranges.length; i++) {
        var pos = ranges[i].from();
        var col = countColumn(cm.getLine(pos.line), pos.ch, tabSize);
        spaces.push(spaceStr(tabSize - col % tabSize));
      }
      cm.replaceSelections(spaces);
    },
    defaultTab: function (cm) {
      if (cm.somethingSelected()) { cm.indentSelection("add"); }
      else { cm.execCommand("insertTab"); }
    },
    // Swap the two chars left and right of each selection's head.
    // Move cursor behind the two swapped characters afterwards.
    //
    // Doesn't consider line feeds a character.
    // Doesn't scan more than one line above to find a character.
    // Doesn't do anything on an empty line.
    // Doesn't do anything with non-empty selections.
    transposeChars: function (cm) { return runInOp(cm, function () {
      var ranges = cm.listSelections(), newSel = [];
      for (var i = 0; i < ranges.length; i++) {
        if (!ranges[i].empty()) { continue }
        var cur = ranges[i].head, line = getLine(cm.doc, cur.line).text;
        if (line) {
          if (cur.ch == line.length) { cur = new Pos(cur.line, cur.ch - 1); }
          if (cur.ch > 0) {
            cur = new Pos(cur.line, cur.ch + 1);
            cm.replaceRange(line.charAt(cur.ch - 1) + line.charAt(cur.ch - 2),
                            Pos(cur.line, cur.ch - 2), cur, "+transpose");
          } else if (cur.line > cm.doc.first) {
            var prev = getLine(cm.doc, cur.line - 1).text;
            if (prev) {
              cur = new Pos(cur.line, 1);
              cm.replaceRange(line.charAt(0) + cm.doc.lineSeparator() +
                              prev.charAt(prev.length - 1),
                              Pos(cur.line - 1, prev.length - 1), cur, "+transpose");
            }
          }
        }
        newSel.push(new Range(cur, cur));
      }
      cm.setSelections(newSel);
    }); },
    newlineAndIndent: function (cm) { return runInOp(cm, function () {
      var sels = cm.listSelections();
      for (var i = sels.length - 1; i >= 0; i--)
        { cm.replaceRange(cm.doc.lineSeparator(), sels[i].anchor, sels[i].head, "+input"); }
      sels = cm.listSelections();
      for (var i$1 = 0; i$1 < sels.length; i$1++)
        { cm.indentLine(sels[i$1].from().line, null, true); }
      ensureCursorVisible(cm);
    }); },
    openLine: function (cm) { return cm.replaceSelection("\n", "start"); },
    toggleOverwrite: function (cm) { return cm.toggleOverwrite(); }
  };


  function lineStart(cm, lineN) {
    var line = getLine(cm.doc, lineN);
    var visual = visualLine(line);
    if (visual != line) { lineN = lineNo(visual); }
    return endOfLine(true, cm, visual, lineN, 1)
  }
  function lineEnd(cm, lineN) {
    var line = getLine(cm.doc, lineN);
    var visual = visualLineEnd(line);
    if (visual != line) { lineN = lineNo(visual); }
    return endOfLine(true, cm, line, lineN, -1)
  }
  function lineStartSmart(cm, pos) {
    var start = lineStart(cm, pos.line);
    var line = getLine(cm.doc, start.line);
    var order = getOrder(line, cm.doc.direction);
    if (!order || order[0].level == 0) {
      var firstNonWS = Math.max(start.ch, line.text.search(/\S/));
      var inWS = pos.line == start.line && pos.ch <= firstNonWS && pos.ch;
      return Pos(start.line, inWS ? 0 : firstNonWS, start.sticky)
    }
    return start
  }

  // Run a handler that was bound to a key.
  function doHandleBinding(cm, bound, dropShift) {
    if (typeof bound == "string") {
      bound = commands[bound];
      if (!bound) { return false }
    }
    // Ensure previous input has been read, so that the handler sees a
    // consistent view of the document
    cm.display.input.ensurePolled();
    var prevShift = cm.display.shift, done = false;
    try {
      if (cm.isReadOnly()) { cm.state.suppressEdits = true; }
      if (dropShift) { cm.display.shift = false; }
      done = bound(cm) != Pass;
    } finally {
      cm.display.shift = prevShift;
      cm.state.suppressEdits = false;
    }
    return done
  }

  function lookupKeyForEditor(cm, name, handle) {
    for (var i = 0; i < cm.state.keyMaps.length; i++) {
      var result = lookupKey(name, cm.state.keyMaps[i], handle, cm);
      if (result) { return result }
    }
    return (cm.options.extraKeys && lookupKey(name, cm.options.extraKeys, handle, cm))
      || lookupKey(name, cm.options.keyMap, handle, cm)
  }

  // Note that, despite the name, this function is also used to check
  // for bound mouse clicks.

  var stopSeq = new Delayed;

  function dispatchKey(cm, name, e, handle) {
    var seq = cm.state.keySeq;
    if (seq) {
      if (isModifierKey(name)) { return "handled" }
      if (/\'$/.test(name))
        { cm.state.keySeq = null; }
      else
        { stopSeq.set(50, function () {
          if (cm.state.keySeq == seq) {
            cm.state.keySeq = null;
            cm.display.input.reset();
          }
        }); }
      if (dispatchKeyInner(cm, seq + " " + name, e, handle)) { return true }
    }
    return dispatchKeyInner(cm, name, e, handle)
  }

  function dispatchKeyInner(cm, name, e, handle) {
    var result = lookupKeyForEditor(cm, name, handle);

    if (result == "multi")
      { cm.state.keySeq = name; }
    if (result == "handled")
      { signalLater(cm, "keyHandled", cm, name, e); }

    if (result == "handled" || result == "multi") {
      e_preventDefault(e);
      restartBlink(cm);
    }

    return !!result
  }

  // Handle a key from the keydown event.
  function handleKeyBinding(cm, e) {
    var name = keyName(e, true);
    if (!name) { return false }

    if (e.shiftKey && !cm.state.keySeq) {
      // First try to resolve full name (including 'Shift-'). Failing
      // that, see if there is a cursor-motion command (starting with
      // 'go') bound to the keyname without 'Shift-'.
      return dispatchKey(cm, "Shift-" + name, e, function (b) { return doHandleBinding(cm, b, true); })
          || dispatchKey(cm, name, e, function (b) {
               if (typeof b == "string" ? /^go[A-Z]/.test(b) : b.motion)
                 { return doHandleBinding(cm, b) }
             })
    } else {
      return dispatchKey(cm, name, e, function (b) { return doHandleBinding(cm, b); })
    }
  }

  // Handle a key from the keypress event
  function handleCharBinding(cm, e, ch) {
    return dispatchKey(cm, "'" + ch + "'", e, function (b) { return doHandleBinding(cm, b, true); })
  }

  var lastStoppedKey = null;
  function onKeyDown(e) {
    var cm = this;
    if (e.target && e.target != cm.display.input.getField()) { return }
    cm.curOp.focus = activeElt();
    if (signalDOMEvent(cm, e)) { return }
    // IE does strange things with escape.
    if (ie && ie_version < 11 && e.keyCode == 27) { e.returnValue = false; }
    var code = e.keyCode;
    cm.display.shift = code == 16 || e.shiftKey;
    var handled = handleKeyBinding(cm, e);
    if (presto) {
      lastStoppedKey = handled ? code : null;
      // Opera has no cut event... we try to at least catch the key combo
      if (!handled && code == 88 && !hasCopyEvent && (mac ? e.metaKey : e.ctrlKey))
        { cm.replaceSelection("", null, "cut"); }
    }
    if (gecko && !mac && !handled && code == 46 && e.shiftKey && !e.ctrlKey && document.execCommand)
      { document.execCommand("cut"); }

    // Turn mouse into crosshair when Alt is held on Mac.
    if (code == 18 && !/\bCodeMirror-crosshair\b/.test(cm.display.lineDiv.className))
      { showCrossHair(cm); }
  }

  function showCrossHair(cm) {
    var lineDiv = cm.display.lineDiv;
    addClass(lineDiv, "CodeMirror-crosshair");

    function up(e) {
      if (e.keyCode == 18 || !e.altKey) {
        rmClass(lineDiv, "CodeMirror-crosshair");
        off(document, "keyup", up);
        off(document, "mouseover", up);
      }
    }
    on(document, "keyup", up);
    on(document, "mouseover", up);
  }

  function onKeyUp(e) {
    if (e.keyCode == 16) { this.doc.sel.shift = false; }
    signalDOMEvent(this, e);
  }

  function onKeyPress(e) {
    var cm = this;
    if (e.target && e.target != cm.display.input.getField()) { return }
    if (eventInWidget(cm.display, e) || signalDOMEvent(cm, e) || e.ctrlKey && !e.altKey || mac && e.metaKey) { return }
    var keyCode = e.keyCode, charCode = e.charCode;
    if (presto && keyCode == lastStoppedKey) {lastStoppedKey = null; e_preventDefault(e); return}
    if ((presto && (!e.which || e.which < 10)) && handleKeyBinding(cm, e)) { return }
    var ch = String.fromCharCode(charCode == null ? keyCode : charCode);
    // Some browsers fire keypress events for backspace
    if (ch == "\x08") { return }
    if (handleCharBinding(cm, e, ch)) { return }
    cm.display.input.onKeyPress(e);
  }

  var DOUBLECLICK_DELAY = 400;

  var PastClick = function(time, pos, button) {
    this.time = time;
    this.pos = pos;
    this.button = button;
  };

  PastClick.prototype.compare = function (time, pos, button) {
    return this.time + DOUBLECLICK_DELAY > time &&
      cmp(pos, this.pos) == 0 && button == this.button
  };

  var lastClick, lastDoubleClick;
  function clickRepeat(pos, button) {
    var now = +new Date;
    if (lastDoubleClick && lastDoubleClick.compare(now, pos, button)) {
      lastClick = lastDoubleClick = null;
      return "triple"
    } else if (lastClick && lastClick.compare(now, pos, button)) {
      lastDoubleClick = new PastClick(now, pos, button);
      lastClick = null;
      return "double"
    } else {
      lastClick = new PastClick(now, pos, button);
      lastDoubleClick = null;
      return "single"
    }
  }

  // A mouse down can be a single click, double click, triple click,
  // start of selection drag, start of text drag, new cursor
  // (ctrl-click), rectangle drag (alt-drag), or xwin
  // middle-click-paste. Or it might be a click on something we should
  // not interfere with, such as a scrollbar or widget.
  function onMouseDown(e) {
    var cm = this, display = cm.display;
    if (signalDOMEvent(cm, e) || display.activeTouch && display.input.supportsTouch()) { return }
    display.input.ensurePolled();
    display.shift = e.shiftKey;

    if (eventInWidget(display, e)) {
      if (!webkit) {
        // Briefly turn off draggability, to allow widgets to do
        // normal dragging things.
        display.scroller.draggable = false;
        setTimeout(function () { return display.scroller.draggable = true; }, 100);
      }
      return
    }
    if (clickInGutter(cm, e)) { return }
    var pos = posFromMouse(cm, e), button = e_button(e), repeat = pos ? clickRepeat(pos, button) : "single";
    window.focus();

    // #3261: make sure, that we're not starting a second selection
    if (button == 1 && cm.state.selectingText)
      { cm.state.selectingText(e); }

    if (pos && handleMappedButton(cm, button, pos, repeat, e)) { return }

    if (button == 1) {
      if (pos) { leftButtonDown(cm, pos, repeat, e); }
      else if (e_target(e) == display.scroller) { e_preventDefault(e); }
    } else if (button == 2) {
      if (pos) { extendSelection(cm.doc, pos); }
      setTimeout(function () { return display.input.focus(); }, 20);
    } else if (button == 3) {
      if (captureRightClick) { cm.display.input.onContextMenu(e); }
      else { delayBlurEvent(cm); }
    }
  }

  function handleMappedButton(cm, button, pos, repeat, event) {
    var name = "Click";
    if (repeat == "double") { name = "Double" + name; }
    else if (repeat == "triple") { name = "Triple" + name; }
    name = (button == 1 ? "Left" : button == 2 ? "Middle" : "Right") + name;

    return dispatchKey(cm,  addModifierNames(name, event), event, function (bound) {
      if (typeof bound == "string") { bound = commands[bound]; }
      if (!bound) { return false }
      var done = false;
      try {
        if (cm.isReadOnly()) { cm.state.suppressEdits = true; }
        done = bound(cm, pos) != Pass;
      } finally {
        cm.state.suppressEdits = false;
      }
      return done
    })
  }

  function configureMouse(cm, repeat, event) {
    var option = cm.getOption("configureMouse");
    var value = option ? option(cm, repeat, event) : {};
    if (value.unit == null) {
      var rect = chromeOS ? event.shiftKey && event.metaKey : event.altKey;
      value.unit = rect ? "rectangle" : repeat == "single" ? "char" : repeat == "double" ? "word" : "line";
    }
    if (value.extend == null || cm.doc.extend) { value.extend = cm.doc.extend || event.shiftKey; }
    if (value.addNew == null) { value.addNew = mac ? event.metaKey : event.ctrlKey; }
    if (value.moveOnDrag == null) { value.moveOnDrag = !(mac ? event.altKey : event.ctrlKey); }
    return value
  }

  function leftButtonDown(cm, pos, repeat, event) {
    if (ie) { setTimeout(bind(ensureFocus, cm), 0); }
    else { cm.curOp.focus = activeElt(); }

    var behavior = configureMouse(cm, repeat, event);

    var sel = cm.doc.sel, contained;
    if (cm.options.dragDrop && dragAndDrop && !cm.isReadOnly() &&
        repeat == "single" && (contained = sel.contains(pos)) > -1 &&
        (cmp((contained = sel.ranges[contained]).from(), pos) < 0 || pos.xRel > 0) &&
        (cmp(contained.to(), pos) > 0 || pos.xRel < 0))
      { leftButtonStartDrag(cm, event, pos, behavior); }
    else
      { leftButtonSelect(cm, event, pos, behavior); }
  }

  // Start a text drag. When it ends, see if any dragging actually
  // happen, and treat as a click if it didn't.
  function leftButtonStartDrag(cm, event, pos, behavior) {
    var display = cm.display, moved = false;
    var dragEnd = operation(cm, function (e) {
      if (webkit) { display.scroller.draggable = false; }
      cm.state.draggingText = false;
      off(display.wrapper.ownerDocument, "mouseup", dragEnd);
      off(display.wrapper.ownerDocument, "mousemove", mouseMove);
      off(display.scroller, "dragstart", dragStart);
      off(display.scroller, "drop", dragEnd);
      if (!moved) {
        e_preventDefault(e);
        if (!behavior.addNew)
          { extendSelection(cm.doc, pos, null, null, behavior.extend); }
        // Work around unexplainable focus problem in IE9 (#2127) and Chrome (#3081)
        if ((webkit && !safari) || ie && ie_version == 9)
          { setTimeout(function () {display.wrapper.ownerDocument.body.focus({preventScroll: true}); display.input.focus();}, 20); }
        else
          { display.input.focus(); }
      }
    });
    var mouseMove = function(e2) {
      moved = moved || Math.abs(event.clientX - e2.clientX) + Math.abs(event.clientY - e2.clientY) >= 10;
    };
    var dragStart = function () { return moved = true; };
    // Let the drag handler handle this.
    if (webkit) { display.scroller.draggable = true; }
    cm.state.draggingText = dragEnd;
    dragEnd.copy = !behavior.moveOnDrag;
    // IE's approach to draggable
    if (display.scroller.dragDrop) { display.scroller.dragDrop(); }
    on(display.wrapper.ownerDocument, "mouseup", dragEnd);
    on(display.wrapper.ownerDocument, "mousemove", mouseMove);
    on(display.scroller, "dragstart", dragStart);
    on(display.scroller, "drop", dragEnd);

    delayBlurEvent(cm);
    setTimeout(function () { return display.input.focus(); }, 20);
  }

  function rangeForUnit(cm, pos, unit) {
    if (unit == "char") { return new Range(pos, pos) }
    if (unit == "word") { return cm.findWordAt(pos) }
    if (unit == "line") { return new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0))) }
    var result = unit(cm, pos);
    return new Range(result.from, result.to)
  }

  // Normal selection, as opposed to text dragging.
  function leftButtonSelect(cm, event, start, behavior) {
    var display = cm.display, doc = cm.doc;
    e_preventDefault(event);

    var ourRange, ourIndex, startSel = doc.sel, ranges = startSel.ranges;
    if (behavior.addNew && !behavior.extend) {
      ourIndex = doc.sel.contains(start);
      if (ourIndex > -1)
        { ourRange = ranges[ourIndex]; }
      else
        { ourRange = new Range(start, start); }
    } else {
      ourRange = doc.sel.primary();
      ourIndex = doc.sel.primIndex;
    }

    if (behavior.unit == "rectangle") {
      if (!behavior.addNew) { ourRange = new Range(start, start); }
      start = posFromMouse(cm, event, true, true);
      ourIndex = -1;
    } else {
      var range = rangeForUnit(cm, start, behavior.unit);
      if (behavior.extend)
        { ourRange = extendRange(ourRange, range.anchor, range.head, behavior.extend); }
      else
        { ourRange = range; }
    }

    if (!behavior.addNew) {
      ourIndex = 0;
      setSelection(doc, new Selection([ourRange], 0), sel_mouse);
      startSel = doc.sel;
    } else if (ourIndex == -1) {
      ourIndex = ranges.length;
      setSelection(doc, normalizeSelection(cm, ranges.concat([ourRange]), ourIndex),
                   {scroll: false, origin: "*mouse"});
    } else if (ranges.length > 1 && ranges[ourIndex].empty() && behavior.unit == "char" && !behavior.extend) {
      setSelection(doc, normalizeSelection(cm, ranges.slice(0, ourIndex).concat(ranges.slice(ourIndex + 1)), 0),
                   {scroll: false, origin: "*mouse"});
      startSel = doc.sel;
    } else {
      replaceOneSelection(doc, ourIndex, ourRange, sel_mouse);
    }

    var lastPos = start;
    function extendTo(pos) {
      if (cmp(lastPos, pos) == 0) { return }
      lastPos = pos;

      if (behavior.unit == "rectangle") {
        var ranges = [], tabSize = cm.options.tabSize;
        var startCol = countColumn(getLine(doc, start.line).text, start.ch, tabSize);
        var posCol = countColumn(getLine(doc, pos.line).text, pos.ch, tabSize);
        var left = Math.min(startCol, posCol), right = Math.max(startCol, posCol);
        for (var line = Math.min(start.line, pos.line), end = Math.min(cm.lastLine(), Math.max(start.line, pos.line));
             line <= end; line++) {
          var text = getLine(doc, line).text, leftPos = findColumn(text, left, tabSize);
          if (left == right)
            { ranges.push(new Range(Pos(line, leftPos), Pos(line, leftPos))); }
          else if (text.length > leftPos)
            { ranges.push(new Range(Pos(line, leftPos), Pos(line, findColumn(text, right, tabSize)))); }
        }
        if (!ranges.length) { ranges.push(new Range(start, start)); }
        setSelection(doc, normalizeSelection(cm, startSel.ranges.slice(0, ourIndex).concat(ranges), ourIndex),
                     {origin: "*mouse", scroll: false});
        cm.scrollIntoView(pos);
      } else {
        var oldRange = ourRange;
        var range = rangeForUnit(cm, pos, behavior.unit);
        var anchor = oldRange.anchor, head;
        if (cmp(range.anchor, anchor) > 0) {
          head = range.head;
          anchor = minPos(oldRange.from(), range.anchor);
        } else {
          head = range.anchor;
          anchor = maxPos(oldRange.to(), range.head);
        }
        var ranges$1 = startSel.ranges.slice(0);
        ranges$1[ourIndex] = bidiSimplify(cm, new Range(clipPos(doc, anchor), head));
        setSelection(doc, normalizeSelection(cm, ranges$1, ourIndex), sel_mouse);
      }
    }

    var editorSize = display.wrapper.getBoundingClientRect();
    // Used to ensure timeout re-tries don't fire when another extend
    // happened in the meantime (clearTimeout isn't reliable -- at
    // least on Chrome, the timeouts still happen even when cleared,
    // if the clear happens after their scheduled firing time).
    var counter = 0;

    function extend(e) {
      var curCount = ++counter;
      var cur = posFromMouse(cm, e, true, behavior.unit == "rectangle");
      if (!cur) { return }
      if (cmp(cur, lastPos) != 0) {
        cm.curOp.focus = activeElt();
        extendTo(cur);
        var visible = visibleLines(display, doc);
        if (cur.line >= visible.to || cur.line < visible.from)
          { setTimeout(operation(cm, function () {if (counter == curCount) { extend(e); }}), 150); }
      } else {
        var outside = e.clientY < editorSize.top ? -20 : e.clientY > editorSize.bottom ? 20 : 0;
        if (outside) { setTimeout(operation(cm, function () {
          if (counter != curCount) { return }
          display.scroller.scrollTop += outside;
          extend(e);
        }), 50); }
      }
    }

    function done(e) {
      cm.state.selectingText = false;
      counter = Infinity;
      // If e is null or undefined we interpret this as someone trying
      // to explicitly cancel the selection rather than the user
      // letting go of the mouse button.
      if (e) {
        e_preventDefault(e);
        display.input.focus();
      }
      off(display.wrapper.ownerDocument, "mousemove", move);
      off(display.wrapper.ownerDocument, "mouseup", up);
      doc.history.lastSelOrigin = null;
    }

    var move = operation(cm, function (e) {
      if (e.buttons === 0 || !e_button(e)) { done(e); }
      else { extend(e); }
    });
    var up = operation(cm, done);
    cm.state.selectingText = up;
    on(display.wrapper.ownerDocument, "mousemove", move);
    on(display.wrapper.ownerDocument, "mouseup", up);
  }

  // Used when mouse-selecting to adjust the anchor to the proper side
  // of a bidi jump depending on the visual position of the head.
  function bidiSimplify(cm, range) {
    var anchor = range.anchor;
    var head = range.head;
    var anchorLine = getLine(cm.doc, anchor.line);
    if (cmp(anchor, head) == 0 && anchor.sticky == head.sticky) { return range }
    var order = getOrder(anchorLine);
    if (!order) { return range }
    var index = getBidiPartAt(order, anchor.ch, anchor.sticky), part = order[index];
    if (part.from != anchor.ch && part.to != anchor.ch) { return range }
    var boundary = index + ((part.from == anchor.ch) == (part.level != 1) ? 0 : 1);
    if (boundary == 0 || boundary == order.length) { return range }

    // Compute the relative visual position of the head compared to the
    // anchor (<0 is to the left, >0 to the right)
    var leftSide;
    if (head.line != anchor.line) {
      leftSide = (head.line - anchor.line) * (cm.doc.direction == "ltr" ? 1 : -1) > 0;
    } else {
      var headIndex = getBidiPartAt(order, head.ch, head.sticky);
      var dir = headIndex - index || (head.ch - anchor.ch) * (part.level == 1 ? -1 : 1);
      if (headIndex == boundary - 1 || headIndex == boundary)
        { leftSide = dir < 0; }
      else
        { leftSide = dir > 0; }
    }

    var usePart = order[boundary + (leftSide ? -1 : 0)];
    var from = leftSide == (usePart.level == 1);
    var ch = from ? usePart.from : usePart.to, sticky = from ? "after" : "before";
    return anchor.ch == ch && anchor.sticky == sticky ? range : new Range(new Pos(anchor.line, ch, sticky), head)
  }


  // Determines whether an event happened in the gutter, and fires the
  // handlers for the corresponding event.
  function gutterEvent(cm, e, type, prevent) {
    var mX, mY;
    if (e.touches) {
      mX = e.touches[0].clientX;
      mY = e.touches[0].clientY;
    } else {
      try { mX = e.clientX; mY = e.clientY; }
      catch(e) { return false }
    }
    if (mX >= Math.floor(cm.display.gutters.getBoundingClientRect().right)) { return false }
    if (prevent) { e_preventDefault(e); }

    var display = cm.display;
    var lineBox = display.lineDiv.getBoundingClientRect();

    if (mY > lineBox.bottom || !hasHandler(cm, type)) { return e_defaultPrevented(e) }
    mY -= lineBox.top - display.viewOffset;

    for (var i = 0; i < cm.display.gutterSpecs.length; ++i) {
      var g = display.gutters.childNodes[i];
      if (g && g.getBoundingClientRect().right >= mX) {
        var line = lineAtHeight(cm.doc, mY);
        var gutter = cm.display.gutterSpecs[i];
        signal(cm, type, cm, line, gutter.className, e);
        return e_defaultPrevented(e)
      }
    }
  }

  function clickInGutter(cm, e) {
    return gutterEvent(cm, e, "gutterClick", true)
  }

  // CONTEXT MENU HANDLING

  // To make the context menu work, we need to briefly unhide the
  // textarea (making it as unobtrusive as possible) to let the
  // right-click take effect on it.
  function onContextMenu(cm, e) {
    if (eventInWidget(cm.display, e) || contextMenuInGutter(cm, e)) { return }
    if (signalDOMEvent(cm, e, "contextmenu")) { return }
    if (!captureRightClick) { cm.display.input.onContextMenu(e); }
  }

  function contextMenuInGutter(cm, e) {
    if (!hasHandler(cm, "gutterContextMenu")) { return false }
    return gutterEvent(cm, e, "gutterContextMenu", false)
  }

  function themeChanged(cm) {
    cm.display.wrapper.className = cm.display.wrapper.className.replace(/\s*cm-s-\S+/g, "") +
      cm.options.theme.replace(/(^|\s)\s*/g, " cm-s-");
    clearCaches(cm);
  }

  var Init = {toString: function(){return "CodeMirror.Init"}};

  var defaults = {};
  var optionHandlers = {};

  function defineOptions(CodeMirror) {
    var optionHandlers = CodeMirror.optionHandlers;

    function option(name, deflt, handle, notOnInit) {
      CodeMirror.defaults[name] = deflt;
      if (handle) { optionHandlers[name] =
        notOnInit ? function (cm, val, old) {if (old != Init) { handle(cm, val, old); }} : handle; }
    }

    CodeMirror.defineOption = option;

    // Passed to option handlers when there is no old value.
    CodeMirror.Init = Init;

    // These two are, on init, called from the constructor because they
    // have to be initialized before the editor can start at all.
    option("value", "", function (cm, val) { return cm.setValue(val); }, true);
    option("mode", null, function (cm, val) {
      cm.doc.modeOption = val;
      loadMode(cm);
    }, true);

    option("indentUnit", 2, loadMode, true);
    option("indentWithTabs", false);
    option("smartIndent", true);
    option("tabSize", 4, function (cm) {
      resetModeState(cm);
      clearCaches(cm);
      regChange(cm);
    }, true);

    option("lineSeparator", null, function (cm, val) {
      cm.doc.lineSep = val;
      if (!val) { return }
      var newBreaks = [], lineNo = cm.doc.first;
      cm.doc.iter(function (line) {
        for (var pos = 0;;) {
          var found = line.text.indexOf(val, pos);
          if (found == -1) { break }
          pos = found + val.length;
          newBreaks.push(Pos(lineNo, found));
        }
        lineNo++;
      });
      for (var i = newBreaks.length - 1; i >= 0; i--)
        { replaceRange(cm.doc, val, newBreaks[i], Pos(newBreaks[i].line, newBreaks[i].ch + val.length)); }
    });
    option("specialChars", /[\u0000-\u001f\u007f-\u009f\u00ad\u061c\u200b-\u200f\u2028\u2029\ufeff\ufff9-\ufffc]/g, function (cm, val, old) {
      cm.state.specialChars = new RegExp(val.source + (val.test("\t") ? "" : "|\t"), "g");
      if (old != Init) { cm.refresh(); }
    });
    option("specialCharPlaceholder", defaultSpecialCharPlaceholder, function (cm) { return cm.refresh(); }, true);
    option("electricChars", true);
    option("inputStyle", mobile ? "contenteditable" : "textarea", function () {
      throw new Error("inputStyle can not (yet) be changed in a running editor") // FIXME
    }, true);
    option("spellcheck", false, function (cm, val) { return cm.getInputField().spellcheck = val; }, true);
    option("autocorrect", false, function (cm, val) { return cm.getInputField().autocorrect = val; }, true);
    option("autocapitalize", false, function (cm, val) { return cm.getInputField().autocapitalize = val; }, true);
    option("rtlMoveVisually", !windows);
    option("wholeLineUpdateBefore", true);

    option("theme", "default", function (cm) {
      themeChanged(cm);
      updateGutters(cm);
    }, true);
    option("keyMap", "default", function (cm, val, old) {
      var next = getKeyMap(val);
      var prev = old != Init && getKeyMap(old);
      if (prev && prev.detach) { prev.detach(cm, next); }
      if (next.attach) { next.attach(cm, prev || null); }
    });
    option("extraKeys", null);
    option("configureMouse", null);

    option("lineWrapping", false, wrappingChanged, true);
    option("gutters", [], function (cm, val) {
      cm.display.gutterSpecs = getGutters(val, cm.options.lineNumbers);
      updateGutters(cm);
    }, true);
    option("fixedGutter", true, function (cm, val) {
      cm.display.gutters.style.left = val ? compensateForHScroll(cm.display) + "px" : "0";
      cm.refresh();
    }, true);
    option("coverGutterNextToScrollbar", false, function (cm) { return updateScrollbars(cm); }, true);
    option("scrollbarStyle", "native", function (cm) {
      initScrollbars(cm);
      updateScrollbars(cm);
      cm.display.scrollbars.setScrollTop(cm.doc.scrollTop);
      cm.display.scrollbars.setScrollLeft(cm.doc.scrollLeft);
    }, true);
    option("lineNumbers", false, function (cm, val) {
      cm.display.gutterSpecs = getGutters(cm.options.gutters, val);
      updateGutters(cm);
    }, true);
    option("firstLineNumber", 1, updateGutters, true);
    option("lineNumberFormatter", function (integer) { return integer; }, updateGutters, true);
    option("showCursorWhenSelecting", false, updateSelection, true);

    option("resetSelectionOnContextMenu", true);
    option("lineWiseCopyCut", true);
    option("pasteLinesPerSelection", true);
    option("selectionsMayTouch", false);

    option("readOnly", false, function (cm, val) {
      if (val == "nocursor") {
        onBlur(cm);
        cm.display.input.blur();
      }
      cm.display.input.readOnlyChanged(val);
    });

    option("screenReaderLabel", null, function (cm, val) {
      val = (val === '') ? null : val;
      cm.display.input.screenReaderLabelChanged(val);
    });

    option("disableInput", false, function (cm, val) {if (!val) { cm.display.input.reset(); }}, true);
    option("dragDrop", true, dragDropChanged);
    option("allowDropFileTypes", null);

    option("cursorBlinkRate", 530);
    option("cursorScrollMargin", 0);
    option("cursorHeight", 1, updateSelection, true);
    option("singleCursorHeightPerLine", true, updateSelection, true);
    option("workTime", 100);
    option("workDelay", 100);
    option("flattenSpans", true, resetModeState, true);
    option("addModeClass", false, resetModeState, true);
    option("pollInterval", 100);
    option("undoDepth", 200, function (cm, val) { return cm.doc.history.undoDepth = val; });
    option("historyEventDelay", 1250);
    option("viewportMargin", 10, function (cm) { return cm.refresh(); }, true);
    option("maxHighlightLength", 10000, resetModeState, true);
    option("moveInputWithCursor", true, function (cm, val) {
      if (!val) { cm.display.input.resetPosition(); }
    });

    option("tabindex", null, function (cm, val) { return cm.display.input.getField().tabIndex = val || ""; });
    option("autofocus", null);
    option("direction", "ltr", function (cm, val) { return cm.doc.setDirection(val); }, true);
    option("phrases", null);
  }

  function dragDropChanged(cm, value, old) {
    var wasOn = old && old != Init;
    if (!value != !wasOn) {
      var funcs = cm.display.dragFunctions;
      var toggle = value ? on : off;
      toggle(cm.display.scroller, "dragstart", funcs.start);
      toggle(cm.display.scroller, "dragenter", funcs.enter);
      toggle(cm.display.scroller, "dragover", funcs.over);
      toggle(cm.display.scroller, "dragleave", funcs.leave);
      toggle(cm.display.scroller, "drop", funcs.drop);
    }
  }

  function wrappingChanged(cm) {
    if (cm.options.lineWrapping) {
      addClass(cm.display.wrapper, "CodeMirror-wrap");
      cm.display.sizer.style.minWidth = "";
      cm.display.sizerWidth = null;
    } else {
      rmClass(cm.display.wrapper, "CodeMirror-wrap");
      findMaxLine(cm);
    }
    estimateLineHeights(cm);
    regChange(cm);
    clearCaches(cm);
    setTimeout(function () { return updateScrollbars(cm); }, 100);
  }

  // A CodeMirror instance represents an editor. This is the object
  // that user code is usually dealing with.

  function CodeMirror(place, options) {
    var this$1 = this;

    if (!(this instanceof CodeMirror)) { return new CodeMirror(place, options) }

    this.options = options = options ? copyObj(options) : {};
    // Determine effective options based on given values and defaults.
    copyObj(defaults, options, false);

    var doc = options.value;
    if (typeof doc == "string") { doc = new Doc(doc, options.mode, null, options.lineSeparator, options.direction); }
    else if (options.mode) { doc.modeOption = options.mode; }
    this.doc = doc;

    var input = new CodeMirror.inputStyles[options.inputStyle](this);
    var display = this.display = new Display(place, doc, input, options);
    display.wrapper.CodeMirror = this;
    themeChanged(this);
    if (options.lineWrapping)
      { this.display.wrapper.className += " CodeMirror-wrap"; }
    initScrollbars(this);

    this.state = {
      keyMaps: [],  // stores maps added by addKeyMap
      overlays: [], // highlighting overlays, as added by addOverlay
      modeGen: 0,   // bumped when mode/overlay changes, used to invalidate highlighting info
      overwrite: false,
      delayingBlurEvent: false,
      focused: false,
      suppressEdits: false, // used to disable editing during key handlers when in readOnly mode
      pasteIncoming: -1, cutIncoming: -1, // help recognize paste/cut edits in input.poll
      selectingText: false,
      draggingText: false,
      highlight: new Delayed(), // stores highlight worker timeout
      keySeq: null,  // Unfinished key sequence
      specialChars: null
    };

    if (options.autofocus && !mobile) { display.input.focus(); }

    // Override magic textarea content restore that IE sometimes does
    // on our hidden textarea on reload
    if (ie && ie_version < 11) { setTimeout(function () { return this$1.display.input.reset(true); }, 20); }

    registerEventHandlers(this);
    ensureGlobalHandlers();

    startOperation(this);
    this.curOp.forceUpdate = true;
    attachDoc(this, doc);

    if ((options.autofocus && !mobile) || this.hasFocus())
      { setTimeout(bind(onFocus, this), 20); }
    else
      { onBlur(this); }

    for (var opt in optionHandlers) { if (optionHandlers.hasOwnProperty(opt))
      { optionHandlers[opt](this, options[opt], Init); } }
    maybeUpdateLineNumberWidth(this);
    if (options.finishInit) { options.finishInit(this); }
    for (var i = 0; i < initHooks.length; ++i) { initHooks[i](this); }
    endOperation(this);
    // Suppress optimizelegibility in Webkit, since it breaks text
    // measuring on line wrapping boundaries.
    if (webkit && options.lineWrapping &&
        getComputedStyle(display.lineDiv).textRendering == "optimizelegibility")
      { display.lineDiv.style.textRendering = "auto"; }
  }

  // The default configuration options.
  CodeMirror.defaults = defaults;
  // Functions to run when options are changed.
  CodeMirror.optionHandlers = optionHandlers;

  // Attach the necessary event handlers when initializing the editor
  function registerEventHandlers(cm) {
    var d = cm.display;
    on(d.scroller, "mousedown", operation(cm, onMouseDown));
    // Older IE's will not fire a second mousedown for a double click
    if (ie && ie_version < 11)
      { on(d.scroller, "dblclick", operation(cm, function (e) {
        if (signalDOMEvent(cm, e)) { return }
        var pos = posFromMouse(cm, e);
        if (!pos || clickInGutter(cm, e) || eventInWidget(cm.display, e)) { return }
        e_preventDefault(e);
        var word = cm.findWordAt(pos);
        extendSelection(cm.doc, word.anchor, word.head);
      })); }
    else
      { on(d.scroller, "dblclick", function (e) { return signalDOMEvent(cm, e) || e_preventDefault(e); }); }
    // Some browsers fire contextmenu *after* opening the menu, at
    // which point we can't mess with it anymore. Context menu is
    // handled in onMouseDown for these browsers.
    on(d.scroller, "contextmenu", function (e) { return onContextMenu(cm, e); });
    on(d.input.getField(), "contextmenu", function (e) {
      if (!d.scroller.contains(e.target)) { onContextMenu(cm, e); }
    });

    // Used to suppress mouse event handling when a touch happens
    var touchFinished, prevTouch = {end: 0};
    function finishTouch() {
      if (d.activeTouch) {
        touchFinished = setTimeout(function () { return d.activeTouch = null; }, 1000);
        prevTouch = d.activeTouch;
        prevTouch.end = +new Date;
      }
    }
    function isMouseLikeTouchEvent(e) {
      if (e.touches.length != 1) { return false }
      var touch = e.touches[0];
      return touch.radiusX <= 1 && touch.radiusY <= 1
    }
    function farAway(touch, other) {
      if (other.left == null) { return true }
      var dx = other.left - touch.left, dy = other.top - touch.top;
      return dx * dx + dy * dy > 20 * 20
    }
    on(d.scroller, "touchstart", function (e) {
      if (!signalDOMEvent(cm, e) && !isMouseLikeTouchEvent(e) && !clickInGutter(cm, e)) {
        d.input.ensurePolled();
        clearTimeout(touchFinished);
        var now = +new Date;
        d.activeTouch = {start: now, moved: false,
                         prev: now - prevTouch.end <= 300 ? prevTouch : null};
        if (e.touches.length == 1) {
          d.activeTouch.left = e.touches[0].pageX;
          d.activeTouch.top = e.touches[0].pageY;
        }
      }
    });
    on(d.scroller, "touchmove", function () {
      if (d.activeTouch) { d.activeTouch.moved = true; }
    });
    on(d.scroller, "touchend", function (e) {
      var touch = d.activeTouch;
      if (touch && !eventInWidget(d, e) && touch.left != null &&
          !touch.moved && new Date - touch.start < 300) {
        var pos = cm.coordsChar(d.activeTouch, "page"), range;
        if (!touch.prev || farAway(touch, touch.prev)) // Single tap
          { range = new Range(pos, pos); }
        else if (!touch.prev.prev || farAway(touch, touch.prev.prev)) // Double tap
          { range = cm.findWordAt(pos); }
        else // Triple tap
          { range = new Range(Pos(pos.line, 0), clipPos(cm.doc, Pos(pos.line + 1, 0))); }
        cm.setSelection(range.anchor, range.head);
        cm.focus();
        e_preventDefault(e);
      }
      finishTouch();
    });
    on(d.scroller, "touchcancel", finishTouch);

    // Sync scrolling between fake scrollbars and real scrollable
    // area, ensure viewport is updated when scrolling.
    on(d.scroller, "scroll", function () {
      if (d.scroller.clientHeight) {
        updateScrollTop(cm, d.scroller.scrollTop);
        setScrollLeft(cm, d.scroller.scrollLeft, true);
        signal(cm, "scroll", cm);
      }
    });

    // Listen to wheel events in order to try and update the viewport on time.
    on(d.scroller, "mousewheel", function (e) { return onScrollWheel(cm, e); });
    on(d.scroller, "DOMMouseScroll", function (e) { return onScrollWheel(cm, e); });

    // Prevent wrapper from ever scrolling
    on(d.wrapper, "scroll", function () { return d.wrapper.scrollTop = d.wrapper.scrollLeft = 0; });

    d.dragFunctions = {
      enter: function (e) {if (!signalDOMEvent(cm, e)) { e_stop(e); }},
      over: function (e) {if (!signalDOMEvent(cm, e)) { onDragOver(cm, e); e_stop(e); }},
      start: function (e) { return onDragStart(cm, e); },
      drop: operation(cm, onDrop),
      leave: function (e) {if (!signalDOMEvent(cm, e)) { clearDragCursor(cm); }}
    };

    var inp = d.input.getField();
    on(inp, "keyup", function (e) { return onKeyUp.call(cm, e); });
    on(inp, "keydown", operation(cm, onKeyDown));
    on(inp, "keypress", operation(cm, onKeyPress));
    on(inp, "focus", function (e) { return onFocus(cm, e); });
    on(inp, "blur", function (e) { return onBlur(cm, e); });
  }

  var initHooks = [];
  CodeMirror.defineInitHook = function (f) { return initHooks.push(f); };

  // Indent the given line. The how parameter can be "smart",
  // "add"/null, "subtract", or "prev". When aggressive is false
  // (typically set to true for forced single-line indents), empty
  // lines are not indented, and places where the mode returns Pass
  // are left alone.
  function indentLine(cm, n, how, aggressive) {
    var doc = cm.doc, state;
    if (how == null) { how = "add"; }
    if (how == "smart") {
      // Fall back to "prev" when the mode doesn't have an indentation
      // method.
      if (!doc.mode.indent) { how = "prev"; }
      else { state = getContextBefore(cm, n).state; }
    }

    var tabSize = cm.options.tabSize;
    var line = getLine(doc, n), curSpace = countColumn(line.text, null, tabSize);
    if (line.stateAfter) { line.stateAfter = null; }
    var curSpaceString = line.text.match(/^\s*/)[0], indentation;
    if (!aggressive && !/\S/.test(line.text)) {
      indentation = 0;
      how = "not";
    } else if (how == "smart") {
      indentation = doc.mode.indent(state, line.text.slice(curSpaceString.length), line.text);
      if (indentation == Pass || indentation > 150) {
        if (!aggressive) { return }
        how = "prev";
      }
    }
    if (how == "prev") {
      if (n > doc.first) { indentation = countColumn(getLine(doc, n-1).text, null, tabSize); }
      else { indentation = 0; }
    } else if (how == "add") {
      indentation = curSpace + cm.options.indentUnit;
    } else if (how == "subtract") {
      indentation = curSpace - cm.options.indentUnit;
    } else if (typeof how == "number") {
      indentation = curSpace + how;
    }
    indentation = Math.max(0, indentation);

    var indentString = "", pos = 0;
    if (cm.options.indentWithTabs)
      { for (var i = Math.floor(indentation / tabSize); i; --i) {pos += tabSize; indentString += "\t";} }
    if (pos < indentation) { indentString += spaceStr(indentation - pos); }

    if (indentString != curSpaceString) {
      replaceRange(doc, indentString, Pos(n, 0), Pos(n, curSpaceString.length), "+input");
      line.stateAfter = null;
      return true
    } else {
      // Ensure that, if the cursor was in the whitespace at the start
      // of the line, it is moved to the end of that space.
      for (var i$1 = 0; i$1 < doc.sel.ranges.length; i$1++) {
        var range = doc.sel.ranges[i$1];
        if (range.head.line == n && range.head.ch < curSpaceString.length) {
          var pos$1 = Pos(n, curSpaceString.length);
          replaceOneSelection(doc, i$1, new Range(pos$1, pos$1));
          break
        }
      }
    }
  }

  // This will be set to a {lineWise: bool, text: [string]} object, so
  // that, when pasting, we know what kind of selections the copied
  // text was made out of.
  var lastCopied = null;

  function setLastCopied(newLastCopied) {
    lastCopied = newLastCopied;
  }

  function applyTextInput(cm, inserted, deleted, sel, origin) {
    var doc = cm.doc;
    cm.display.shift = false;
    if (!sel) { sel = doc.sel; }

    var recent = +new Date - 200;
    var paste = origin == "paste" || cm.state.pasteIncoming > recent;
    var textLines = splitLinesAuto(inserted), multiPaste = null;
    // When pasting N lines into N selections, insert one line per selection
    if (paste && sel.ranges.length > 1) {
      if (lastCopied && lastCopied.text.join("\n") == inserted) {
        if (sel.ranges.length % lastCopied.text.length == 0) {
          multiPaste = [];
          for (var i = 0; i < lastCopied.text.length; i++)
            { multiPaste.push(doc.splitLines(lastCopied.text[i])); }
        }
      } else if (textLines.length == sel.ranges.length && cm.options.pasteLinesPerSelection) {
        multiPaste = map(textLines, function (l) { return [l]; });
      }
    }

    var updateInput = cm.curOp.updateInput;
    // Normal behavior is to insert the new text into every selection
    for (var i$1 = sel.ranges.length - 1; i$1 >= 0; i$1--) {
      var range = sel.ranges[i$1];
      var from = range.from(), to = range.to();
      if (range.empty()) {
        if (deleted && deleted > 0) // Handle deletion
          { from = Pos(from.line, from.ch - deleted); }
        else if (cm.state.overwrite && !paste) // Handle overwrite
          { to = Pos(to.line, Math.min(getLine(doc, to.line).text.length, to.ch + lst(textLines).length)); }
        else if (paste && lastCopied && lastCopied.lineWise && lastCopied.text.join("\n") == inserted)
          { from = to = Pos(from.line, 0); }
      }
      var changeEvent = {from: from, to: to, text: multiPaste ? multiPaste[i$1 % multiPaste.length] : textLines,
                         origin: origin || (paste ? "paste" : cm.state.cutIncoming > recent ? "cut" : "+input")};
      makeChange(cm.doc, changeEvent);
      signalLater(cm, "inputRead", cm, changeEvent);
    }
    if (inserted && !paste)
      { triggerElectric(cm, inserted); }

    ensureCursorVisible(cm);
    if (cm.curOp.updateInput < 2) { cm.curOp.updateInput = updateInput; }
    cm.curOp.typing = true;
    cm.state.pasteIncoming = cm.state.cutIncoming = -1;
  }

  function handlePaste(e, cm) {
    var pasted = e.clipboardData && e.clipboardData.getData("Text");
    if (pasted) {
      e.preventDefault();
      if (!cm.isReadOnly() && !cm.options.disableInput)
        { runInOp(cm, function () { return applyTextInput(cm, pasted, 0, null, "paste"); }); }
      return true
    }
  }

  function triggerElectric(cm, inserted) {
    // When an 'electric' character is inserted, immediately trigger a reindent
    if (!cm.options.electricChars || !cm.options.smartIndent) { return }
    var sel = cm.doc.sel;

    for (var i = sel.ranges.length - 1; i >= 0; i--) {
      var range = sel.ranges[i];
      if (range.head.ch > 100 || (i && sel.ranges[i - 1].head.line == range.head.line)) { continue }
      var mode = cm.getModeAt(range.head);
      var indented = false;
      if (mode.electricChars) {
        for (var j = 0; j < mode.electricChars.length; j++)
          { if (inserted.indexOf(mode.electricChars.charAt(j)) > -1) {
            indented = indentLine(cm, range.head.line, "smart");
            break
          } }
      } else if (mode.electricInput) {
        if (mode.electricInput.test(getLine(cm.doc, range.head.line).text.slice(0, range.head.ch)))
          { indented = indentLine(cm, range.head.line, "smart"); }
      }
      if (indented) { signalLater(cm, "electricInput", cm, range.head.line); }
    }
  }

  function copyableRanges(cm) {
    var text = [], ranges = [];
    for (var i = 0; i < cm.doc.sel.ranges.length; i++) {
      var line = cm.doc.sel.ranges[i].head.line;
      var lineRange = {anchor: Pos(line, 0), head: Pos(line + 1, 0)};
      ranges.push(lineRange);
      text.push(cm.getRange(lineRange.anchor, lineRange.head));
    }
    return {text: text, ranges: ranges}
  }

  function disableBrowserMagic(field, spellcheck, autocorrect, autocapitalize) {
    field.setAttribute("autocorrect", autocorrect ? "" : "off");
    field.setAttribute("autocapitalize", autocapitalize ? "" : "off");
    field.setAttribute("spellcheck", !!spellcheck);
  }

  function hiddenTextarea() {
    var te = elt("textarea", null, null, "position: absolute; bottom: -1em; padding: 0; width: 1px; height: 1em; outline: none");
    var div = elt("div", [te], null, "overflow: hidden; position: relative; width: 3px; height: 0px;");
    // The textarea is kept positioned near the cursor to prevent the
    // fact that it'll be scrolled into view on input from scrolling
    // our fake cursor out of view. On webkit, when wrap=off, paste is
    // very slow. So make the area wide instead.
    if (webkit) { te.style.width = "1000px"; }
    else { te.setAttribute("wrap", "off"); }
    // If border: 0; -- iOS fails to open keyboard (issue #1287)
    if (ios) { te.style.border = "1px solid black"; }
    disableBrowserMagic(te);
    return div
  }

  // The publicly visible API. Note that methodOp(f) means
  // 'wrap f in an operation, performed on its `this` parameter'.

  // This is not the complete set of editor methods. Most of the
  // methods defined on the Doc type are also injected into
  // CodeMirror.prototype, for backwards compatibility and
  // convenience.

  function addEditorMethods(CodeMirror) {
    var optionHandlers = CodeMirror.optionHandlers;

    var helpers = CodeMirror.helpers = {};

    CodeMirror.prototype = {
      constructor: CodeMirror,
      focus: function(){window.focus(); this.display.input.focus();},

      setOption: function(option, value) {
        var options = this.options, old = options[option];
        if (options[option] == value && option != "mode") { return }
        options[option] = value;
        if (optionHandlers.hasOwnProperty(option))
          { operation(this, optionHandlers[option])(this, value, old); }
        signal(this, "optionChange", this, option);
      },

      getOption: function(option) {return this.options[option]},
      getDoc: function() {return this.doc},

      addKeyMap: function(map, bottom) {
        this.state.keyMaps[bottom ? "push" : "unshift"](getKeyMap(map));
      },
      removeKeyMap: function(map) {
        var maps = this.state.keyMaps;
        for (var i = 0; i < maps.length; ++i)
          { if (maps[i] == map || maps[i].name == map) {
            maps.splice(i, 1);
            return true
          } }
      },

      addOverlay: methodOp(function(spec, options) {
        var mode = spec.token ? spec : CodeMirror.getMode(this.options, spec);
        if (mode.startState) { throw new Error("Overlays may not be stateful.") }
        insertSorted(this.state.overlays,
                     {mode: mode, modeSpec: spec, opaque: options && options.opaque,
                      priority: (options && options.priority) || 0},
                     function (overlay) { return overlay.priority; });
        this.state.modeGen++;
        regChange(this);
      }),
      removeOverlay: methodOp(function(spec) {
        var overlays = this.state.overlays;
        for (var i = 0; i < overlays.length; ++i) {
          var cur = overlays[i].modeSpec;
          if (cur == spec || typeof spec == "string" && cur.name == spec) {
            overlays.splice(i, 1);
            this.state.modeGen++;
            regChange(this);
            return
          }
        }
      }),

      indentLine: methodOp(function(n, dir, aggressive) {
        if (typeof dir != "string" && typeof dir != "number") {
          if (dir == null) { dir = this.options.smartIndent ? "smart" : "prev"; }
          else { dir = dir ? "add" : "subtract"; }
        }
        if (isLine(this.doc, n)) { indentLine(this, n, dir, aggressive); }
      }),
      indentSelection: methodOp(function(how) {
        var ranges = this.doc.sel.ranges, end = -1;
        for (var i = 0; i < ranges.length; i++) {
          var range = ranges[i];
          if (!range.empty()) {
            var from = range.from(), to = range.to();
            var start = Math.max(end, from.line);
            end = Math.min(this.lastLine(), to.line - (to.ch ? 0 : 1)) + 1;
            for (var j = start; j < end; ++j)
              { indentLine(this, j, how); }
            var newRanges = this.doc.sel.ranges;
            if (from.ch == 0 && ranges.length == newRanges.length && newRanges[i].from().ch > 0)
              { replaceOneSelection(this.doc, i, new Range(from, newRanges[i].to()), sel_dontScroll); }
          } else if (range.head.line > end) {
            indentLine(this, range.head.line, how, true);
            end = range.head.line;
            if (i == this.doc.sel.primIndex) { ensureCursorVisible(this); }
          }
        }
      }),

      // Fetch the parser token for a given character. Useful for hacks
      // that want to inspect the mode state (say, for completion).
      getTokenAt: function(pos, precise) {
        return takeToken(this, pos, precise)
      },

      getLineTokens: function(line, precise) {
        return takeToken(this, Pos(line), precise, true)
      },

      getTokenTypeAt: function(pos) {
        pos = clipPos(this.doc, pos);
        var styles = getLineStyles(this, getLine(this.doc, pos.line));
        var before = 0, after = (styles.length - 1) / 2, ch = pos.ch;
        var type;
        if (ch == 0) { type = styles[2]; }
        else { for (;;) {
          var mid = (before + after) >> 1;
          if ((mid ? styles[mid * 2 - 1] : 0) >= ch) { after = mid; }
          else if (styles[mid * 2 + 1] < ch) { before = mid + 1; }
          else { type = styles[mid * 2 + 2]; break }
        } }
        var cut = type ? type.indexOf("overlay ") : -1;
        return cut < 0 ? type : cut == 0 ? null : type.slice(0, cut - 1)
      },

      getModeAt: function(pos) {
        var mode = this.doc.mode;
        if (!mode.innerMode) { return mode }
        return CodeMirror.innerMode(mode, this.getTokenAt(pos).state).mode
      },

      getHelper: function(pos, type) {
        return this.getHelpers(pos, type)[0]
      },

      getHelpers: function(pos, type) {
        var found = [];
        if (!helpers.hasOwnProperty(type)) { return found }
        var help = helpers[type], mode = this.getModeAt(pos);
        if (typeof mode[type] == "string") {
          if (help[mode[type]]) { found.push(help[mode[type]]); }
        } else if (mode[type]) {
          for (var i = 0; i < mode[type].length; i++) {
            var val = help[mode[type][i]];
            if (val) { found.push(val); }
          }
        } else if (mode.helperType && help[mode.helperType]) {
          found.push(help[mode.helperType]);
        } else if (help[mode.name]) {
          found.push(help[mode.name]);
        }
        for (var i$1 = 0; i$1 < help._global.length; i$1++) {
          var cur = help._global[i$1];
          if (cur.pred(mode, this) && indexOf(found, cur.val) == -1)
            { found.push(cur.val); }
        }
        return found
      },

      getStateAfter: function(line, precise) {
        var doc = this.doc;
        line = clipLine(doc, line == null ? doc.first + doc.size - 1: line);
        return getContextBefore(this, line + 1, precise).state
      },

      cursorCoords: function(start, mode) {
        var pos, range = this.doc.sel.primary();
        if (start == null) { pos = range.head; }
        else if (typeof start == "object") { pos = clipPos(this.doc, start); }
        else { pos = start ? range.from() : range.to(); }
        return cursorCoords(this, pos, mode || "page")
      },

      charCoords: function(pos, mode) {
        return charCoords(this, clipPos(this.doc, pos), mode || "page")
      },

      coordsChar: function(coords, mode) {
        coords = fromCoordSystem(this, coords, mode || "page");
        return coordsChar(this, coords.left, coords.top)
      },

      lineAtHeight: function(height, mode) {
        height = fromCoordSystem(this, {top: height, left: 0}, mode || "page").top;
        return lineAtHeight(this.doc, height + this.display.viewOffset)
      },
      heightAtLine: function(line, mode, includeWidgets) {
        var end = false, lineObj;
        if (typeof line == "number") {
          var last = this.doc.first + this.doc.size - 1;
          if (line < this.doc.first) { line = this.doc.first; }
          else if (line > last) { line = last; end = true; }
          lineObj = getLine(this.doc, line);
        } else {
          lineObj = line;
        }
        return intoCoordSystem(this, lineObj, {top: 0, left: 0}, mode || "page", includeWidgets || end).top +
          (end ? this.doc.height - heightAtLine(lineObj) : 0)
      },

      defaultTextHeight: function() { return textHeight(this.display) },
      defaultCharWidth: function() { return charWidth(this.display) },

      getViewport: function() { return {from: this.display.viewFrom, to: this.display.viewTo}},

      addWidget: function(pos, node, scroll, vert, horiz) {
        var display = this.display;
        pos = cursorCoords(this, clipPos(this.doc, pos));
        var top = pos.bottom, left = pos.left;
        node.style.position = "absolute";
        node.setAttribute("cm-ignore-events", "true");
        this.display.input.setUneditable(node);
        display.sizer.appendChild(node);
        if (vert == "over") {
          top = pos.top;
        } else if (vert == "above" || vert == "near") {
          var vspace = Math.max(display.wrapper.clientHeight, this.doc.height),
          hspace = Math.max(display.sizer.clientWidth, display.lineSpace.clientWidth);
          // Default to positioning above (if specified and possible); otherwise default to positioning below
          if ((vert == 'above' || pos.bottom + node.offsetHeight > vspace) && pos.top > node.offsetHeight)
            { top = pos.top - node.offsetHeight; }
          else if (pos.bottom + node.offsetHeight <= vspace)
            { top = pos.bottom; }
          if (left + node.offsetWidth > hspace)
            { left = hspace - node.offsetWidth; }
        }
        node.style.top = top + "px";
        node.style.left = node.style.right = "";
        if (horiz == "right") {
          left = display.sizer.clientWidth - node.offsetWidth;
          node.style.right = "0px";
        } else {
          if (horiz == "left") { left = 0; }
          else if (horiz == "middle") { left = (display.sizer.clientWidth - node.offsetWidth) / 2; }
          node.style.left = left + "px";
        }
        if (scroll)
          { scrollIntoView(this, {left: left, top: top, right: left + node.offsetWidth, bottom: top + node.offsetHeight}); }
      },

      triggerOnKeyDown: methodOp(onKeyDown),
      triggerOnKeyPress: methodOp(onKeyPress),
      triggerOnKeyUp: onKeyUp,
      triggerOnMouseDown: methodOp(onMouseDown),

      execCommand: function(cmd) {
        if (commands.hasOwnProperty(cmd))
          { return commands[cmd].call(null, this) }
      },

      triggerElectric: methodOp(function(text) { triggerElectric(this, text); }),

      findPosH: function(from, amount, unit, visually) {
        var dir = 1;
        if (amount < 0) { dir = -1; amount = -amount; }
        var cur = clipPos(this.doc, from);
        for (var i = 0; i < amount; ++i) {
          cur = findPosH(this.doc, cur, dir, unit, visually);
          if (cur.hitSide) { break }
        }
        return cur
      },

      moveH: methodOp(function(dir, unit) {
        var this$1 = this;

        this.extendSelectionsBy(function (range) {
          if (this$1.display.shift || this$1.doc.extend || range.empty())
            { return findPosH(this$1.doc, range.head, dir, unit, this$1.options.rtlMoveVisually) }
          else
            { return dir < 0 ? range.from() : range.to() }
        }, sel_move);
      }),

      deleteH: methodOp(function(dir, unit) {
        var sel = this.doc.sel, doc = this.doc;
        if (sel.somethingSelected())
          { doc.replaceSelection("", null, "+delete"); }
        else
          { deleteNearSelection(this, function (range) {
            var other = findPosH(doc, range.head, dir, unit, false);
            return dir < 0 ? {from: other, to: range.head} : {from: range.head, to: other}
          }); }
      }),

      findPosV: function(from, amount, unit, goalColumn) {
        var dir = 1, x = goalColumn;
        if (amount < 0) { dir = -1; amount = -amount; }
        var cur = clipPos(this.doc, from);
        for (var i = 0; i < amount; ++i) {
          var coords = cursorCoords(this, cur, "div");
          if (x == null) { x = coords.left; }
          else { coords.left = x; }
          cur = findPosV(this, coords, dir, unit);
          if (cur.hitSide) { break }
        }
        return cur
      },

      moveV: methodOp(function(dir, unit) {
        var this$1 = this;

        var doc = this.doc, goals = [];
        var collapse = !this.display.shift && !doc.extend && doc.sel.somethingSelected();
        doc.extendSelectionsBy(function (range) {
          if (collapse)
            { return dir < 0 ? range.from() : range.to() }
          var headPos = cursorCoords(this$1, range.head, "div");
          if (range.goalColumn != null) { headPos.left = range.goalColumn; }
          goals.push(headPos.left);
          var pos = findPosV(this$1, headPos, dir, unit);
          if (unit == "page" && range == doc.sel.primary())
            { addToScrollTop(this$1, charCoords(this$1, pos, "div").top - headPos.top); }
          return pos
        }, sel_move);
        if (goals.length) { for (var i = 0; i < doc.sel.ranges.length; i++)
          { doc.sel.ranges[i].goalColumn = goals[i]; } }
      }),

      // Find the word at the given position (as returned by coordsChar).
      findWordAt: function(pos) {
        var doc = this.doc, line = getLine(doc, pos.line).text;
        var start = pos.ch, end = pos.ch;
        if (line) {
          var helper = this.getHelper(pos, "wordChars");
          if ((pos.sticky == "before" || end == line.length) && start) { --start; } else { ++end; }
          var startChar = line.charAt(start);
          var check = isWordChar(startChar, helper)
            ? function (ch) { return isWordChar(ch, helper); }
            : /\s/.test(startChar) ? function (ch) { return /\s/.test(ch); }
            : function (ch) { return (!/\s/.test(ch) && !isWordChar(ch)); };
          while (start > 0 && check(line.charAt(start - 1))) { --start; }
          while (end < line.length && check(line.charAt(end))) { ++end; }
        }
        return new Range(Pos(pos.line, start), Pos(pos.line, end))
      },

      toggleOverwrite: function(value) {
        if (value != null && value == this.state.overwrite) { return }
        if (this.state.overwrite = !this.state.overwrite)
          { addClass(this.display.cursorDiv, "CodeMirror-overwrite"); }
        else
          { rmClass(this.display.cursorDiv, "CodeMirror-overwrite"); }

        signal(this, "overwriteToggle", this, this.state.overwrite);
      },
      hasFocus: function() { return this.display.input.getField() == activeElt() },
      isReadOnly: function() { return !!(this.options.readOnly || this.doc.cantEdit) },

      scrollTo: methodOp(function (x, y) { scrollToCoords(this, x, y); }),
      getScrollInfo: function() {
        var scroller = this.display.scroller;
        return {left: scroller.scrollLeft, top: scroller.scrollTop,
                height: scroller.scrollHeight - scrollGap(this) - this.display.barHeight,
                width: scroller.scrollWidth - scrollGap(this) - this.display.barWidth,
                clientHeight: displayHeight(this), clientWidth: displayWidth(this)}
      },

      scrollIntoView: methodOp(function(range, margin) {
        if (range == null) {
          range = {from: this.doc.sel.primary().head, to: null};
          if (margin == null) { margin = this.options.cursorScrollMargin; }
        } else if (typeof range == "number") {
          range = {from: Pos(range, 0), to: null};
        } else if (range.from == null) {
          range = {from: range, to: null};
        }
        if (!range.to) { range.to = range.from; }
        range.margin = margin || 0;

        if (range.from.line != null) {
          scrollToRange(this, range);
        } else {
          scrollToCoordsRange(this, range.from, range.to, range.margin);
        }
      }),

      setSize: methodOp(function(width, height) {
        var this$1 = this;

        var interpret = function (val) { return typeof val == "number" || /^\d+$/.test(String(val)) ? val + "px" : val; };
        if (width != null) { this.display.wrapper.style.width = interpret(width); }
        if (height != null) { this.display.wrapper.style.height = interpret(height); }
        if (this.options.lineWrapping) { clearLineMeasurementCache(this); }
        var lineNo = this.display.viewFrom;
        this.doc.iter(lineNo, this.display.viewTo, function (line) {
          if (line.widgets) { for (var i = 0; i < line.widgets.length; i++)
            { if (line.widgets[i].noHScroll) { regLineChange(this$1, lineNo, "widget"); break } } }
          ++lineNo;
        });
        this.curOp.forceUpdate = true;
        signal(this, "refresh", this);
      }),

      operation: function(f){return runInOp(this, f)},
      startOperation: function(){return startOperation(this)},
      endOperation: function(){return endOperation(this)},

      refresh: methodOp(function() {
        var oldHeight = this.display.cachedTextHeight;
        regChange(this);
        this.curOp.forceUpdate = true;
        clearCaches(this);
        scrollToCoords(this, this.doc.scrollLeft, this.doc.scrollTop);
        updateGutterSpace(this.display);
        if (oldHeight == null || Math.abs(oldHeight - textHeight(this.display)) > .5 || this.options.lineWrapping)
          { estimateLineHeights(this); }
        signal(this, "refresh", this);
      }),

      swapDoc: methodOp(function(doc) {
        var old = this.doc;
        old.cm = null;
        // Cancel the current text selection if any (#5821)
        if (this.state.selectingText) { this.state.selectingText(); }
        attachDoc(this, doc);
        clearCaches(this);
        this.display.input.reset();
        scrollToCoords(this, doc.scrollLeft, doc.scrollTop);
        this.curOp.forceScroll = true;
        signalLater(this, "swapDoc", this, old);
        return old
      }),

      phrase: function(phraseText) {
        var phrases = this.options.phrases;
        return phrases && Object.prototype.hasOwnProperty.call(phrases, phraseText) ? phrases[phraseText] : phraseText
      },

      getInputField: function(){return this.display.input.getField()},
      getWrapperElement: function(){return this.display.wrapper},
      getScrollerElement: function(){return this.display.scroller},
      getGutterElement: function(){return this.display.gutters}
    };
    eventMixin(CodeMirror);

    CodeMirror.registerHelper = function(type, name, value) {
      if (!helpers.hasOwnProperty(type)) { helpers[type] = CodeMirror[type] = {_global: []}; }
      helpers[type][name] = value;
    };
    CodeMirror.registerGlobalHelper = function(type, name, predicate, value) {
      CodeMirror.registerHelper(type, name, value);
      helpers[type]._global.push({pred: predicate, val: value});
    };
  }

  // Used for horizontal relative motion. Dir is -1 or 1 (left or
  // right), unit can be "char", "column" (like char, but doesn't
  // cross line boundaries), "word" (across next word), or "group" (to
  // the start of next group of word or non-word-non-whitespace
  // chars). The visually param controls whether, in right-to-left
  // text, direction 1 means to move towards the next index in the
  // string, or towards the character to the right of the current
  // position. The resulting position will have a hitSide=true
  // property if it reached the end of the document.
  function findPosH(doc, pos, dir, unit, visually) {
    var oldPos = pos;
    var origDir = dir;
    var lineObj = getLine(doc, pos.line);
    var lineDir = visually && doc.direction == "rtl" ? -dir : dir;
    function findNextLine() {
      var l = pos.line + lineDir;
      if (l < doc.first || l >= doc.first + doc.size) { return false }
      pos = new Pos(l, pos.ch, pos.sticky);
      return lineObj = getLine(doc, l)
    }
    function moveOnce(boundToLine) {
      var next;
      if (visually) {
        next = moveVisually(doc.cm, lineObj, pos, dir);
      } else {
        next = moveLogically(lineObj, pos, dir);
      }
      if (next == null) {
        if (!boundToLine && findNextLine())
          { pos = endOfLine(visually, doc.cm, lineObj, pos.line, lineDir); }
        else
          { return false }
      } else {
        pos = next;
      }
      return true
    }

    if (unit == "char") {
      moveOnce();
    } else if (unit == "column") {
      moveOnce(true);
    } else if (unit == "word" || unit == "group") {
      var sawType = null, group = unit == "group";
      var helper = doc.cm && doc.cm.getHelper(pos, "wordChars");
      for (var first = true;; first = false) {
        if (dir < 0 && !moveOnce(!first)) { break }
        var cur = lineObj.text.charAt(pos.ch) || "\n";
        var type = isWordChar(cur, helper) ? "w"
          : group && cur == "\n" ? "n"
          : !group || /\s/.test(cur) ? null
          : "p";
        if (group && !first && !type) { type = "s"; }
        if (sawType && sawType != type) {
          if (dir < 0) {dir = 1; moveOnce(); pos.sticky = "after";}
          break
        }

        if (type) { sawType = type; }
        if (dir > 0 && !moveOnce(!first)) { break }
      }
    }
    var result = skipAtomic(doc, pos, oldPos, origDir, true);
    if (equalCursorPos(oldPos, result)) { result.hitSide = true; }
    return result
  }

  // For relative vertical movement. Dir may be -1 or 1. Unit can be
  // "page" or "line". The resulting position will have a hitSide=true
  // property if it reached the end of the document.
  function findPosV(cm, pos, dir, unit) {
    var doc = cm.doc, x = pos.left, y;
    if (unit == "page") {
      var pageSize = Math.min(cm.display.wrapper.clientHeight, window.innerHeight || document.documentElement.clientHeight);
      var moveAmount = Math.max(pageSize - .5 * textHeight(cm.display), 3);
      y = (dir > 0 ? pos.bottom : pos.top) + dir * moveAmount;

    } else if (unit == "line") {
      y = dir > 0 ? pos.bottom + 3 : pos.top - 3;
    }
    var target;
    for (;;) {
      target = coordsChar(cm, x, y);
      if (!target.outside) { break }
      if (dir < 0 ? y <= 0 : y >= doc.height) { target.hitSide = true; break }
      y += dir * 5;
    }
    return target
  }

  // CONTENTEDITABLE INPUT STYLE

  var ContentEditableInput = function(cm) {
    this.cm = cm;
    this.lastAnchorNode = this.lastAnchorOffset = this.lastFocusNode = this.lastFocusOffset = null;
    this.polling = new Delayed();
    this.composing = null;
    this.gracePeriod = false;
    this.readDOMTimeout = null;
  };

  ContentEditableInput.prototype.init = function (display) {
      var this$1 = this;

    var input = this, cm = input.cm;
    var div = input.div = display.lineDiv;
    disableBrowserMagic(div, cm.options.spellcheck, cm.options.autocorrect, cm.options.autocapitalize);

    function belongsToInput(e) {
      for (var t = e.target; t; t = t.parentNode) {
        if (t == div) { return true }
        if (/\bCodeMirror-(?:line)?widget\b/.test(t.className)) { break }
      }
      return false
    }

    on(div, "paste", function (e) {
      if (!belongsToInput(e) || signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }
      // IE doesn't fire input events, so we schedule a read for the pasted content in this way
      if (ie_version <= 11) { setTimeout(operation(cm, function () { return this$1.updateFromDOM(); }), 20); }
    });

    on(div, "compositionstart", function (e) {
      this$1.composing = {data: e.data, done: false};
    });
    on(div, "compositionupdate", function (e) {
      if (!this$1.composing) { this$1.composing = {data: e.data, done: false}; }
    });
    on(div, "compositionend", function (e) {
      if (this$1.composing) {
        if (e.data != this$1.composing.data) { this$1.readFromDOMSoon(); }
        this$1.composing.done = true;
      }
    });

    on(div, "touchstart", function () { return input.forceCompositionEnd(); });

    on(div, "input", function () {
      if (!this$1.composing) { this$1.readFromDOMSoon(); }
    });

    function onCopyCut(e) {
      if (!belongsToInput(e) || signalDOMEvent(cm, e)) { return }
      if (cm.somethingSelected()) {
        setLastCopied({lineWise: false, text: cm.getSelections()});
        if (e.type == "cut") { cm.replaceSelection("", null, "cut"); }
      } else if (!cm.options.lineWiseCopyCut) {
        return
      } else {
        var ranges = copyableRanges(cm);
        setLastCopied({lineWise: true, text: ranges.text});
        if (e.type == "cut") {
          cm.operation(function () {
            cm.setSelections(ranges.ranges, 0, sel_dontScroll);
            cm.replaceSelection("", null, "cut");
          });
        }
      }
      if (e.clipboardData) {
        e.clipboardData.clearData();
        var content = lastCopied.text.join("\n");
        // iOS exposes the clipboard API, but seems to discard content inserted into it
        e.clipboardData.setData("Text", content);
        if (e.clipboardData.getData("Text") == content) {
          e.preventDefault();
          return
        }
      }
      // Old-fashioned briefly-focus-a-textarea hack
      var kludge = hiddenTextarea(), te = kludge.firstChild;
      cm.display.lineSpace.insertBefore(kludge, cm.display.lineSpace.firstChild);
      te.value = lastCopied.text.join("\n");
      var hadFocus = document.activeElement;
      selectInput(te);
      setTimeout(function () {
        cm.display.lineSpace.removeChild(kludge);
        hadFocus.focus();
        if (hadFocus == div) { input.showPrimarySelection(); }
      }, 50);
    }
    on(div, "copy", onCopyCut);
    on(div, "cut", onCopyCut);
  };

  ContentEditableInput.prototype.screenReaderLabelChanged = function (label) {
    // Label for screenreaders, accessibility
    if(label) {
      this.div.setAttribute('aria-label', label);
    } else {
      this.div.removeAttribute('aria-label');
    }
  };

  ContentEditableInput.prototype.prepareSelection = function () {
    var result = prepareSelection(this.cm, false);
    result.focus = document.activeElement == this.div;
    return result
  };

  ContentEditableInput.prototype.showSelection = function (info, takeFocus) {
    if (!info || !this.cm.display.view.length) { return }
    if (info.focus || takeFocus) { this.showPrimarySelection(); }
    this.showMultipleSelections(info);
  };

  ContentEditableInput.prototype.getSelection = function () {
    return this.cm.display.wrapper.ownerDocument.getSelection()
  };

  ContentEditableInput.prototype.showPrimarySelection = function () {
    var sel = this.getSelection(), cm = this.cm, prim = cm.doc.sel.primary();
    var from = prim.from(), to = prim.to();

    if (cm.display.viewTo == cm.display.viewFrom || from.line >= cm.display.viewTo || to.line < cm.display.viewFrom) {
      sel.removeAllRanges();
      return
    }

    var curAnchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
    var curFocus = domToPos(cm, sel.focusNode, sel.focusOffset);
    if (curAnchor && !curAnchor.bad && curFocus && !curFocus.bad &&
        cmp(minPos(curAnchor, curFocus), from) == 0 &&
        cmp(maxPos(curAnchor, curFocus), to) == 0)
      { return }

    var view = cm.display.view;
    var start = (from.line >= cm.display.viewFrom && posToDOM(cm, from)) ||
        {node: view[0].measure.map[2], offset: 0};
    var end = to.line < cm.display.viewTo && posToDOM(cm, to);
    if (!end) {
      var measure = view[view.length - 1].measure;
      var map = measure.maps ? measure.maps[measure.maps.length - 1] : measure.map;
      end = {node: map[map.length - 1], offset: map[map.length - 2] - map[map.length - 3]};
    }

    if (!start || !end) {
      sel.removeAllRanges();
      return
    }

    var old = sel.rangeCount && sel.getRangeAt(0), rng;
    try { rng = range(start.node, start.offset, end.offset, end.node); }
    catch(e) {} // Our model of the DOM might be outdated, in which case the range we try to set can be impossible
    if (rng) {
      if (!gecko && cm.state.focused) {
        sel.collapse(start.node, start.offset);
        if (!rng.collapsed) {
          sel.removeAllRanges();
          sel.addRange(rng);
        }
      } else {
        sel.removeAllRanges();
        sel.addRange(rng);
      }
      if (old && sel.anchorNode == null) { sel.addRange(old); }
      else if (gecko) { this.startGracePeriod(); }
    }
    this.rememberSelection();
  };

  ContentEditableInput.prototype.startGracePeriod = function () {
      var this$1 = this;

    clearTimeout(this.gracePeriod);
    this.gracePeriod = setTimeout(function () {
      this$1.gracePeriod = false;
      if (this$1.selectionChanged())
        { this$1.cm.operation(function () { return this$1.cm.curOp.selectionChanged = true; }); }
    }, 20);
  };

  ContentEditableInput.prototype.showMultipleSelections = function (info) {
    removeChildrenAndAdd(this.cm.display.cursorDiv, info.cursors);
    removeChildrenAndAdd(this.cm.display.selectionDiv, info.selection);
  };

  ContentEditableInput.prototype.rememberSelection = function () {
    var sel = this.getSelection();
    this.lastAnchorNode = sel.anchorNode; this.lastAnchorOffset = sel.anchorOffset;
    this.lastFocusNode = sel.focusNode; this.lastFocusOffset = sel.focusOffset;
  };

  ContentEditableInput.prototype.selectionInEditor = function () {
    var sel = this.getSelection();
    if (!sel.rangeCount) { return false }
    var node = sel.getRangeAt(0).commonAncestorContainer;
    return contains(this.div, node)
  };

  ContentEditableInput.prototype.focus = function () {
    if (this.cm.options.readOnly != "nocursor") {
      if (!this.selectionInEditor() || document.activeElement != this.div)
        { this.showSelection(this.prepareSelection(), true); }
      this.div.focus();
    }
  };
  ContentEditableInput.prototype.blur = function () { this.div.blur(); };
  ContentEditableInput.prototype.getField = function () { return this.div };

  ContentEditableInput.prototype.supportsTouch = function () { return true };

  ContentEditableInput.prototype.receivedFocus = function () {
    var input = this;
    if (this.selectionInEditor())
      { this.pollSelection(); }
    else
      { runInOp(this.cm, function () { return input.cm.curOp.selectionChanged = true; }); }

    function poll() {
      if (input.cm.state.focused) {
        input.pollSelection();
        input.polling.set(input.cm.options.pollInterval, poll);
      }
    }
    this.polling.set(this.cm.options.pollInterval, poll);
  };

  ContentEditableInput.prototype.selectionChanged = function () {
    var sel = this.getSelection();
    return sel.anchorNode != this.lastAnchorNode || sel.anchorOffset != this.lastAnchorOffset ||
      sel.focusNode != this.lastFocusNode || sel.focusOffset != this.lastFocusOffset
  };

  ContentEditableInput.prototype.pollSelection = function () {
    if (this.readDOMTimeout != null || this.gracePeriod || !this.selectionChanged()) { return }
    var sel = this.getSelection(), cm = this.cm;
    // On Android Chrome (version 56, at least), backspacing into an
    // uneditable block element will put the cursor in that element,
    // and then, because it's not editable, hide the virtual keyboard.
    // Because Android doesn't allow us to actually detect backspace
    // presses in a sane way, this code checks for when that happens
    // and simulates a backspace press in this case.
    if (android && chrome && this.cm.display.gutterSpecs.length && isInGutter(sel.anchorNode)) {
      this.cm.triggerOnKeyDown({type: "keydown", keyCode: 8, preventDefault: Math.abs});
      this.blur();
      this.focus();
      return
    }
    if (this.composing) { return }
    this.rememberSelection();
    var anchor = domToPos(cm, sel.anchorNode, sel.anchorOffset);
    var head = domToPos(cm, sel.focusNode, sel.focusOffset);
    if (anchor && head) { runInOp(cm, function () {
      setSelection(cm.doc, simpleSelection(anchor, head), sel_dontScroll);
      if (anchor.bad || head.bad) { cm.curOp.selectionChanged = true; }
    }); }
  };

  ContentEditableInput.prototype.pollContent = function () {
    if (this.readDOMTimeout != null) {
      clearTimeout(this.readDOMTimeout);
      this.readDOMTimeout = null;
    }

    var cm = this.cm, display = cm.display, sel = cm.doc.sel.primary();
    var from = sel.from(), to = sel.to();
    if (from.ch == 0 && from.line > cm.firstLine())
      { from = Pos(from.line - 1, getLine(cm.doc, from.line - 1).length); }
    if (to.ch == getLine(cm.doc, to.line).text.length && to.line < cm.lastLine())
      { to = Pos(to.line + 1, 0); }
    if (from.line < display.viewFrom || to.line > display.viewTo - 1) { return false }

    var fromIndex, fromLine, fromNode;
    if (from.line == display.viewFrom || (fromIndex = findViewIndex(cm, from.line)) == 0) {
      fromLine = lineNo(display.view[0].line);
      fromNode = display.view[0].node;
    } else {
      fromLine = lineNo(display.view[fromIndex].line);
      fromNode = display.view[fromIndex - 1].node.nextSibling;
    }
    var toIndex = findViewIndex(cm, to.line);
    var toLine, toNode;
    if (toIndex == display.view.length - 1) {
      toLine = display.viewTo - 1;
      toNode = display.lineDiv.lastChild;
    } else {
      toLine = lineNo(display.view[toIndex + 1].line) - 1;
      toNode = display.view[toIndex + 1].node.previousSibling;
    }

    if (!fromNode) { return false }
    var newText = cm.doc.splitLines(domTextBetween(cm, fromNode, toNode, fromLine, toLine));
    var oldText = getBetween(cm.doc, Pos(fromLine, 0), Pos(toLine, getLine(cm.doc, toLine).text.length));
    while (newText.length > 1 && oldText.length > 1) {
      if (lst(newText) == lst(oldText)) { newText.pop(); oldText.pop(); toLine--; }
      else if (newText[0] == oldText[0]) { newText.shift(); oldText.shift(); fromLine++; }
      else { break }
    }

    var cutFront = 0, cutEnd = 0;
    var newTop = newText[0], oldTop = oldText[0], maxCutFront = Math.min(newTop.length, oldTop.length);
    while (cutFront < maxCutFront && newTop.charCodeAt(cutFront) == oldTop.charCodeAt(cutFront))
      { ++cutFront; }
    var newBot = lst(newText), oldBot = lst(oldText);
    var maxCutEnd = Math.min(newBot.length - (newText.length == 1 ? cutFront : 0),
                             oldBot.length - (oldText.length == 1 ? cutFront : 0));
    while (cutEnd < maxCutEnd &&
           newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1))
      { ++cutEnd; }
    // Try to move start of change to start of selection if ambiguous
    if (newText.length == 1 && oldText.length == 1 && fromLine == from.line) {
      while (cutFront && cutFront > from.ch &&
             newBot.charCodeAt(newBot.length - cutEnd - 1) == oldBot.charCodeAt(oldBot.length - cutEnd - 1)) {
        cutFront--;
        cutEnd++;
      }
    }

    newText[newText.length - 1] = newBot.slice(0, newBot.length - cutEnd).replace(/^\u200b+/, "");
    newText[0] = newText[0].slice(cutFront).replace(/\u200b+$/, "");

    var chFrom = Pos(fromLine, cutFront);
    var chTo = Pos(toLine, oldText.length ? lst(oldText).length - cutEnd : 0);
    if (newText.length > 1 || newText[0] || cmp(chFrom, chTo)) {
      replaceRange(cm.doc, newText, chFrom, chTo, "+input");
      return true
    }
  };

  ContentEditableInput.prototype.ensurePolled = function () {
    this.forceCompositionEnd();
  };
  ContentEditableInput.prototype.reset = function () {
    this.forceCompositionEnd();
  };
  ContentEditableInput.prototype.forceCompositionEnd = function () {
    if (!this.composing) { return }
    clearTimeout(this.readDOMTimeout);
    this.composing = null;
    this.updateFromDOM();
    this.div.blur();
    this.div.focus();
  };
  ContentEditableInput.prototype.readFromDOMSoon = function () {
      var this$1 = this;

    if (this.readDOMTimeout != null) { return }
    this.readDOMTimeout = setTimeout(function () {
      this$1.readDOMTimeout = null;
      if (this$1.composing) {
        if (this$1.composing.done) { this$1.composing = null; }
        else { return }
      }
      this$1.updateFromDOM();
    }, 80);
  };

  ContentEditableInput.prototype.updateFromDOM = function () {
      var this$1 = this;

    if (this.cm.isReadOnly() || !this.pollContent())
      { runInOp(this.cm, function () { return regChange(this$1.cm); }); }
  };

  ContentEditableInput.prototype.setUneditable = function (node) {
    node.contentEditable = "false";
  };

  ContentEditableInput.prototype.onKeyPress = function (e) {
    if (e.charCode == 0 || this.composing) { return }
    e.preventDefault();
    if (!this.cm.isReadOnly())
      { operation(this.cm, applyTextInput)(this.cm, String.fromCharCode(e.charCode == null ? e.keyCode : e.charCode), 0); }
  };

  ContentEditableInput.prototype.readOnlyChanged = function (val) {
    this.div.contentEditable = String(val != "nocursor");
  };

  ContentEditableInput.prototype.onContextMenu = function () {};
  ContentEditableInput.prototype.resetPosition = function () {};

  ContentEditableInput.prototype.needsContentAttribute = true;

  function posToDOM(cm, pos) {
    var view = findViewForLine(cm, pos.line);
    if (!view || view.hidden) { return null }
    var line = getLine(cm.doc, pos.line);
    var info = mapFromLineView(view, line, pos.line);

    var order = getOrder(line, cm.doc.direction), side = "left";
    if (order) {
      var partPos = getBidiPartAt(order, pos.ch);
      side = partPos % 2 ? "right" : "left";
    }
    var result = nodeAndOffsetInLineMap(info.map, pos.ch, side);
    result.offset = result.collapse == "right" ? result.end : result.start;
    return result
  }

  function isInGutter(node) {
    for (var scan = node; scan; scan = scan.parentNode)
      { if (/CodeMirror-gutter-wrapper/.test(scan.className)) { return true } }
    return false
  }

  function badPos(pos, bad) { if (bad) { pos.bad = true; } return pos }

  function domTextBetween(cm, from, to, fromLine, toLine) {
    var text = "", closing = false, lineSep = cm.doc.lineSeparator(), extraLinebreak = false;
    function recognizeMarker(id) { return function (marker) { return marker.id == id; } }
    function close() {
      if (closing) {
        text += lineSep;
        if (extraLinebreak) { text += lineSep; }
        closing = extraLinebreak = false;
      }
    }
    function addText(str) {
      if (str) {
        close();
        text += str;
      }
    }
    function walk(node) {
      if (node.nodeType == 1) {
        var cmText = node.getAttribute("cm-text");
        if (cmText) {
          addText(cmText);
          return
        }
        var markerID = node.getAttribute("cm-marker"), range;
        if (markerID) {
          var found = cm.findMarks(Pos(fromLine, 0), Pos(toLine + 1, 0), recognizeMarker(+markerID));
          if (found.length && (range = found[0].find(0)))
            { addText(getBetween(cm.doc, range.from, range.to).join(lineSep)); }
          return
        }
        if (node.getAttribute("contenteditable") == "false") { return }
        var isBlock = /^(pre|div|p|li|table|br)$/i.test(node.nodeName);
        if (!/^br$/i.test(node.nodeName) && node.textContent.length == 0) { return }

        if (isBlock) { close(); }
        for (var i = 0; i < node.childNodes.length; i++)
          { walk(node.childNodes[i]); }

        if (/^(pre|p)$/i.test(node.nodeName)) { extraLinebreak = true; }
        if (isBlock) { closing = true; }
      } else if (node.nodeType == 3) {
        addText(node.nodeValue.replace(/\u200b/g, "").replace(/\u00a0/g, " "));
      }
    }
    for (;;) {
      walk(from);
      if (from == to) { break }
      from = from.nextSibling;
      extraLinebreak = false;
    }
    return text
  }

  function domToPos(cm, node, offset) {
    var lineNode;
    if (node == cm.display.lineDiv) {
      lineNode = cm.display.lineDiv.childNodes[offset];
      if (!lineNode) { return badPos(cm.clipPos(Pos(cm.display.viewTo - 1)), true) }
      node = null; offset = 0;
    } else {
      for (lineNode = node;; lineNode = lineNode.parentNode) {
        if (!lineNode || lineNode == cm.display.lineDiv) { return null }
        if (lineNode.parentNode && lineNode.parentNode == cm.display.lineDiv) { break }
      }
    }
    for (var i = 0; i < cm.display.view.length; i++) {
      var lineView = cm.display.view[i];
      if (lineView.node == lineNode)
        { return locateNodeInLineView(lineView, node, offset) }
    }
  }

  function locateNodeInLineView(lineView, node, offset) {
    var wrapper = lineView.text.firstChild, bad = false;
    if (!node || !contains(wrapper, node)) { return badPos(Pos(lineNo(lineView.line), 0), true) }
    if (node == wrapper) {
      bad = true;
      node = wrapper.childNodes[offset];
      offset = 0;
      if (!node) {
        var line = lineView.rest ? lst(lineView.rest) : lineView.line;
        return badPos(Pos(lineNo(line), line.text.length), bad)
      }
    }

    var textNode = node.nodeType == 3 ? node : null, topNode = node;
    if (!textNode && node.childNodes.length == 1 && node.firstChild.nodeType == 3) {
      textNode = node.firstChild;
      if (offset) { offset = textNode.nodeValue.length; }
    }
    while (topNode.parentNode != wrapper) { topNode = topNode.parentNode; }
    var measure = lineView.measure, maps = measure.maps;

    function find(textNode, topNode, offset) {
      for (var i = -1; i < (maps ? maps.length : 0); i++) {
        var map = i < 0 ? measure.map : maps[i];
        for (var j = 0; j < map.length; j += 3) {
          var curNode = map[j + 2];
          if (curNode == textNode || curNode == topNode) {
            var line = lineNo(i < 0 ? lineView.line : lineView.rest[i]);
            var ch = map[j] + offset;
            if (offset < 0 || curNode != textNode) { ch = map[j + (offset ? 1 : 0)]; }
            return Pos(line, ch)
          }
        }
      }
    }
    var found = find(textNode, topNode, offset);
    if (found) { return badPos(found, bad) }

    // FIXME this is all really shaky. might handle the few cases it needs to handle, but likely to cause problems
    for (var after = topNode.nextSibling, dist = textNode ? textNode.nodeValue.length - offset : 0; after; after = after.nextSibling) {
      found = find(after, after.firstChild, 0);
      if (found)
        { return badPos(Pos(found.line, found.ch - dist), bad) }
      else
        { dist += after.textContent.length; }
    }
    for (var before = topNode.previousSibling, dist$1 = offset; before; before = before.previousSibling) {
      found = find(before, before.firstChild, -1);
      if (found)
        { return badPos(Pos(found.line, found.ch + dist$1), bad) }
      else
        { dist$1 += before.textContent.length; }
    }
  }

  // TEXTAREA INPUT STYLE

  var TextareaInput = function(cm) {
    this.cm = cm;
    // See input.poll and input.reset
    this.prevInput = "";

    // Flag that indicates whether we expect input to appear real soon
    // now (after some event like 'keypress' or 'input') and are
    // polling intensively.
    this.pollingFast = false;
    // Self-resetting timeout for the poller
    this.polling = new Delayed();
    // Used to work around IE issue with selection being forgotten when focus moves away from textarea
    this.hasSelection = false;
    this.composing = null;
  };

  TextareaInput.prototype.init = function (display) {
      var this$1 = this;

    var input = this, cm = this.cm;
    this.createField(display);
    var te = this.textarea;

    display.wrapper.insertBefore(this.wrapper, display.wrapper.firstChild);

    // Needed to hide big blue blinking cursor on Mobile Safari (doesn't seem to work in iOS 8 anymore)
    if (ios) { te.style.width = "0px"; }

    on(te, "input", function () {
      if (ie && ie_version >= 9 && this$1.hasSelection) { this$1.hasSelection = null; }
      input.poll();
    });

    on(te, "paste", function (e) {
      if (signalDOMEvent(cm, e) || handlePaste(e, cm)) { return }

      cm.state.pasteIncoming = +new Date;
      input.fastPoll();
    });

    function prepareCopyCut(e) {
      if (signalDOMEvent(cm, e)) { return }
      if (cm.somethingSelected()) {
        setLastCopied({lineWise: false, text: cm.getSelections()});
      } else if (!cm.options.lineWiseCopyCut) {
        return
      } else {
        var ranges = copyableRanges(cm);
        setLastCopied({lineWise: true, text: ranges.text});
        if (e.type == "cut") {
          cm.setSelections(ranges.ranges, null, sel_dontScroll);
        } else {
          input.prevInput = "";
          te.value = ranges.text.join("\n");
          selectInput(te);
        }
      }
      if (e.type == "cut") { cm.state.cutIncoming = +new Date; }
    }
    on(te, "cut", prepareCopyCut);
    on(te, "copy", prepareCopyCut);

    on(display.scroller, "paste", function (e) {
      if (eventInWidget(display, e) || signalDOMEvent(cm, e)) { return }
      if (!te.dispatchEvent) {
        cm.state.pasteIncoming = +new Date;
        input.focus();
        return
      }

      // Pass the `paste` event to the textarea so it's handled by its event listener.
      var event = new Event("paste");
      event.clipboardData = e.clipboardData;
      te.dispatchEvent(event);
    });

    // Prevent normal selection in the editor (we handle our own)
    on(display.lineSpace, "selectstart", function (e) {
      if (!eventInWidget(display, e)) { e_preventDefault(e); }
    });

    on(te, "compositionstart", function () {
      var start = cm.getCursor("from");
      if (input.composing) { input.composing.range.clear(); }
      input.composing = {
        start: start,
        range: cm.markText(start, cm.getCursor("to"), {className: "CodeMirror-composing"})
      };
    });
    on(te, "compositionend", function () {
      if (input.composing) {
        input.poll();
        input.composing.range.clear();
        input.composing = null;
      }
    });
  };

  TextareaInput.prototype.createField = function (_display) {
    // Wraps and hides input textarea
    this.wrapper = hiddenTextarea();
    // The semihidden textarea that is focused when the editor is
    // focused, and receives input.
    this.textarea = this.wrapper.firstChild;
  };

  TextareaInput.prototype.screenReaderLabelChanged = function (label) {
    // Label for screenreaders, accessibility
    if(label) {
      this.textarea.setAttribute('aria-label', label);
    } else {
      this.textarea.removeAttribute('aria-label');
    }
  };

  TextareaInput.prototype.prepareSelection = function () {
    // Redraw the selection and/or cursor
    var cm = this.cm, display = cm.display, doc = cm.doc;
    var result = prepareSelection(cm);

    // Move the hidden textarea near the cursor to prevent scrolling artifacts
    if (cm.options.moveInputWithCursor) {
      var headPos = cursorCoords(cm, doc.sel.primary().head, "div");
      var wrapOff = display.wrapper.getBoundingClientRect(), lineOff = display.lineDiv.getBoundingClientRect();
      result.teTop = Math.max(0, Math.min(display.wrapper.clientHeight - 10,
                                          headPos.top + lineOff.top - wrapOff.top));
      result.teLeft = Math.max(0, Math.min(display.wrapper.clientWidth - 10,
                                           headPos.left + lineOff.left - wrapOff.left));
    }

    return result
  };

  TextareaInput.prototype.showSelection = function (drawn) {
    var cm = this.cm, display = cm.display;
    removeChildrenAndAdd(display.cursorDiv, drawn.cursors);
    removeChildrenAndAdd(display.selectionDiv, drawn.selection);
    if (drawn.teTop != null) {
      this.wrapper.style.top = drawn.teTop + "px";
      this.wrapper.style.left = drawn.teLeft + "px";
    }
  };

  // Reset the input to correspond to the selection (or to be empty,
  // when not typing and nothing is selected)
  TextareaInput.prototype.reset = function (typing) {
    if (this.contextMenuPending || this.composing) { return }
    var cm = this.cm;
    if (cm.somethingSelected()) {
      this.prevInput = "";
      var content = cm.getSelection();
      this.textarea.value = content;
      if (cm.state.focused) { selectInput(this.textarea); }
      if (ie && ie_version >= 9) { this.hasSelection = content; }
    } else if (!typing) {
      this.prevInput = this.textarea.value = "";
      if (ie && ie_version >= 9) { this.hasSelection = null; }
    }
  };

  TextareaInput.prototype.getField = function () { return this.textarea };

  TextareaInput.prototype.supportsTouch = function () { return false };

  TextareaInput.prototype.focus = function () {
    if (this.cm.options.readOnly != "nocursor" && (!mobile || activeElt() != this.textarea)) {
      try { this.textarea.focus(); }
      catch (e) {} // IE8 will throw if the textarea is display: none or not in DOM
    }
  };

  TextareaInput.prototype.blur = function () { this.textarea.blur(); };

  TextareaInput.prototype.resetPosition = function () {
    this.wrapper.style.top = this.wrapper.style.left = 0;
  };

  TextareaInput.prototype.receivedFocus = function () { this.slowPoll(); };

  // Poll for input changes, using the normal rate of polling. This
  // runs as long as the editor is focused.
  TextareaInput.prototype.slowPoll = function () {
      var this$1 = this;

    if (this.pollingFast) { return }
    this.polling.set(this.cm.options.pollInterval, function () {
      this$1.poll();
      if (this$1.cm.state.focused) { this$1.slowPoll(); }
    });
  };

  // When an event has just come in that is likely to add or change
  // something in the input textarea, we poll faster, to ensure that
  // the change appears on the screen quickly.
  TextareaInput.prototype.fastPoll = function () {
    var missed = false, input = this;
    input.pollingFast = true;
    function p() {
      var changed = input.poll();
      if (!changed && !missed) {missed = true; input.polling.set(60, p);}
      else {input.pollingFast = false; input.slowPoll();}
    }
    input.polling.set(20, p);
  };

  // Read input from the textarea, and update the document to match.
  // When something is selected, it is present in the textarea, and
  // selected (unless it is huge, in which case a placeholder is
  // used). When nothing is selected, the cursor sits after previously
  // seen text (can be empty), which is stored in prevInput (we must
  // not reset the textarea when typing, because that breaks IME).
  TextareaInput.prototype.poll = function () {
      var this$1 = this;

    var cm = this.cm, input = this.textarea, prevInput = this.prevInput;
    // Since this is called a *lot*, try to bail out as cheaply as
    // possible when it is clear that nothing happened. hasSelection
    // will be the case when there is a lot of text in the textarea,
    // in which case reading its value would be expensive.
    if (this.contextMenuPending || !cm.state.focused ||
        (hasSelection(input) && !prevInput && !this.composing) ||
        cm.isReadOnly() || cm.options.disableInput || cm.state.keySeq)
      { return false }

    var text = input.value;
    // If nothing changed, bail.
    if (text == prevInput && !cm.somethingSelected()) { return false }
    // Work around nonsensical selection resetting in IE9/10, and
    // inexplicable appearance of private area unicode characters on
    // some key combos in Mac (#2689).
    if (ie && ie_version >= 9 && this.hasSelection === text ||
        mac && /[\uf700-\uf7ff]/.test(text)) {
      cm.display.input.reset();
      return false
    }

    if (cm.doc.sel == cm.display.selForContextMenu) {
      var first = text.charCodeAt(0);
      if (first == 0x200b && !prevInput) { prevInput = "\u200b"; }
      if (first == 0x21da) { this.reset(); return this.cm.execCommand("undo") }
    }
    // Find the part of the input that is actually new
    var same = 0, l = Math.min(prevInput.length, text.length);
    while (same < l && prevInput.charCodeAt(same) == text.charCodeAt(same)) { ++same; }

    runInOp(cm, function () {
      applyTextInput(cm, text.slice(same), prevInput.length - same,
                     null, this$1.composing ? "*compose" : null);

      // Don't leave long text in the textarea, since it makes further polling slow
      if (text.length > 1000 || text.indexOf("\n") > -1) { input.value = this$1.prevInput = ""; }
      else { this$1.prevInput = text; }

      if (this$1.composing) {
        this$1.composing.range.clear();
        this$1.composing.range = cm.markText(this$1.composing.start, cm.getCursor("to"),
                                           {className: "CodeMirror-composing"});
      }
    });
    return true
  };

  TextareaInput.prototype.ensurePolled = function () {
    if (this.pollingFast && this.poll()) { this.pollingFast = false; }
  };

  TextareaInput.prototype.onKeyPress = function () {
    if (ie && ie_version >= 9) { this.hasSelection = null; }
    this.fastPoll();
  };

  TextareaInput.prototype.onContextMenu = function (e) {
    var input = this, cm = input.cm, display = cm.display, te = input.textarea;
    if (input.contextMenuPending) { input.contextMenuPending(); }
    var pos = posFromMouse(cm, e), scrollPos = display.scroller.scrollTop;
    if (!pos || presto) { return } // Opera is difficult.

    // Reset the current text selection only if the click is done outside of the selection
    // and 'resetSelectionOnContextMenu' option is true.
    var reset = cm.options.resetSelectionOnContextMenu;
    if (reset && cm.doc.sel.contains(pos) == -1)
      { operation(cm, setSelection)(cm.doc, simpleSelection(pos), sel_dontScroll); }

    var oldCSS = te.style.cssText, oldWrapperCSS = input.wrapper.style.cssText;
    var wrapperBox = input.wrapper.offsetParent.getBoundingClientRect();
    input.wrapper.style.cssText = "position: static";
    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);";
    var oldScrollY;
    if (webkit) { oldScrollY = window.scrollY; } // Work around Chrome issue (#2712)
    display.input.focus();
    if (webkit) { window.scrollTo(null, oldScrollY); }
    display.input.reset();
    // Adds "Select all" to context menu in FF
    if (!cm.somethingSelected()) { te.value = input.prevInput = " "; }
    input.contextMenuPending = rehide;
    display.selForContextMenu = cm.doc.sel;
    clearTimeout(display.detectingSelectAll);

    // Select-all will be greyed out if there's nothing to select, so
    // this adds a zero-width space so that we can later check whether
    // it got selected.
    function prepareSelectAllHack() {
      if (te.selectionStart != null) {
        var selected = cm.somethingSelected();
        var extval = "\u200b" + (selected ? te.value : "");
        te.value = "\u21da"; // Used to catch context-menu undo
        te.value = extval;
        input.prevInput = selected ? "" : "\u200b";
        te.selectionStart = 1; te.selectionEnd = extval.length;
        // Re-set this, in case some other handler touched the
        // selection in the meantime.
        display.selForContextMenu = cm.doc.sel;
      }
    }
    function rehide() {
      if (input.contextMenuPending != rehide) { return }
      input.contextMenuPending = false;
      input.wrapper.style.cssText = oldWrapperCSS;
      te.style.cssText = oldCSS;
      if (ie && ie_version < 9) { display.scrollbars.setScrollTop(display.scroller.scrollTop = scrollPos); }

      // Try to detect the user choosing select-all
      if (te.selectionStart != null) {
        if (!ie || (ie && ie_version < 9)) { prepareSelectAllHack(); }
        var i = 0, poll = function () {
          if (display.selForContextMenu == cm.doc.sel && te.selectionStart == 0 &&
              te.selectionEnd > 0 && input.prevInput == "\u200b") {
            operation(cm, selectAll)(cm);
          } else if (i++ < 10) {
            display.detectingSelectAll = setTimeout(poll, 500);
          } else {
            display.selForContextMenu = null;
            display.input.reset();
          }
        };
        display.detectingSelectAll = setTimeout(poll, 200);
      }
    }

    if (ie && ie_version >= 9) { prepareSelectAllHack(); }
    if (captureRightClick) {
      e_stop(e);
      var mouseup = function () {
        off(window, "mouseup", mouseup);
        setTimeout(rehide, 20);
      };
      on(window, "mouseup", mouseup);
    } else {
      setTimeout(rehide, 50);
    }
  };

  TextareaInput.prototype.readOnlyChanged = function (val) {
    if (!val) { this.reset(); }
    this.textarea.disabled = val == "nocursor";
  };

  TextareaInput.prototype.setUneditable = function () {};

  TextareaInput.prototype.needsContentAttribute = false;

  function fromTextArea(textarea, options) {
    options = options ? copyObj(options) : {};
    options.value = textarea.value;
    if (!options.tabindex && textarea.tabIndex)
      { options.tabindex = textarea.tabIndex; }
    if (!options.placeholder && textarea.placeholder)
      { options.placeholder = textarea.placeholder; }
    // Set autofocus to true if this textarea is focused, or if it has
    // autofocus and no other element is focused.
    if (options.autofocus == null) {
      var hasFocus = activeElt();
      options.autofocus = hasFocus == textarea ||
        textarea.getAttribute("autofocus") != null && hasFocus == document.body;
    }

    function save() {textarea.value = cm.getValue();}

    var realSubmit;
    if (textarea.form) {
      on(textarea.form, "submit", save);
      // Deplorable hack to make the submit method do the right thing.
      if (!options.leaveSubmitMethodAlone) {
        var form = textarea.form;
        realSubmit = form.submit;
        try {
          var wrappedSubmit = form.submit = function () {
            save();
            form.submit = realSubmit;
            form.submit();
            form.submit = wrappedSubmit;
          };
        } catch(e) {}
      }
    }

    options.finishInit = function (cm) {
      cm.save = save;
      cm.getTextArea = function () { return textarea; };
      cm.toTextArea = function () {
        cm.toTextArea = isNaN; // Prevent this from being ran twice
        save();
        textarea.parentNode.removeChild(cm.getWrapperElement());
        textarea.style.display = "";
        if (textarea.form) {
          off(textarea.form, "submit", save);
          if (!options.leaveSubmitMethodAlone && typeof textarea.form.submit == "function")
            { textarea.form.submit = realSubmit; }
        }
      };
    };

    textarea.style.display = "none";
    var cm = CodeMirror(function (node) { return textarea.parentNode.insertBefore(node, textarea.nextSibling); },
      options);
    return cm
  }

  function addLegacyProps(CodeMirror) {
    CodeMirror.off = off;
    CodeMirror.on = on;
    CodeMirror.wheelEventPixels = wheelEventPixels;
    CodeMirror.Doc = Doc;
    CodeMirror.splitLines = splitLinesAuto;
    CodeMirror.countColumn = countColumn;
    CodeMirror.findColumn = findColumn;
    CodeMirror.isWordChar = isWordCharBasic;
    CodeMirror.Pass = Pass;
    CodeMirror.signal = signal;
    CodeMirror.Line = Line;
    CodeMirror.changeEnd = changeEnd;
    CodeMirror.scrollbarModel = scrollbarModel;
    CodeMirror.Pos = Pos;
    CodeMirror.cmpPos = cmp;
    CodeMirror.modes = modes;
    CodeMirror.mimeModes = mimeModes;
    CodeMirror.resolveMode = resolveMode;
    CodeMirror.getMode = getMode;
    CodeMirror.modeExtensions = modeExtensions;
    CodeMirror.extendMode = extendMode;
    CodeMirror.copyState = copyState;
    CodeMirror.startState = startState;
    CodeMirror.innerMode = innerMode;
    CodeMirror.commands = commands;
    CodeMirror.keyMap = keyMap;
    CodeMirror.keyName = keyName;
    CodeMirror.isModifierKey = isModifierKey;
    CodeMirror.lookupKey = lookupKey;
    CodeMirror.normalizeKeyMap = normalizeKeyMap;
    CodeMirror.StringStream = StringStream;
    CodeMirror.SharedTextMarker = SharedTextMarker;
    CodeMirror.TextMarker = TextMarker;
    CodeMirror.LineWidget = LineWidget;
    CodeMirror.e_preventDefault = e_preventDefault;
    CodeMirror.e_stopPropagation = e_stopPropagation;
    CodeMirror.e_stop = e_stop;
    CodeMirror.addClass = addClass;
    CodeMirror.contains = contains;
    CodeMirror.rmClass = rmClass;
    CodeMirror.keyNames = keyNames;
  }

  // EDITOR CONSTRUCTOR

  defineOptions(CodeMirror);

  addEditorMethods(CodeMirror);

  // Set up methods on CodeMirror's prototype to redirect to the editor's document.
  var dontDelegate = "iter insert remove copy getEditor constructor".split(" ");
  for (var prop in Doc.prototype) { if (Doc.prototype.hasOwnProperty(prop) && indexOf(dontDelegate, prop) < 0)
    { CodeMirror.prototype[prop] = (function(method) {
      return function() {return method.apply(this.doc, arguments)}
    })(Doc.prototype[prop]); } }

  eventMixin(Doc);
  CodeMirror.inputStyles = {"textarea": TextareaInput, "contenteditable": ContentEditableInput};

  // Extra arguments are stored as the mode's dependencies, which is
  // used by (legacy) mechanisms like loadmode.js to automatically
  // load a mode. (Preferred mechanism is the require/define calls.)
  CodeMirror.defineMode = function(name/*, mode, …*/) {
    if (!CodeMirror.defaults.mode && name != "null") { CodeMirror.defaults.mode = name; }
    defineMode.apply(this, arguments);
  };

  CodeMirror.defineMIME = defineMIME;

  // Minimal default mode.
  CodeMirror.defineMode("null", function () { return ({token: function (stream) { return stream.skipToEnd(); }}); });
  CodeMirror.defineMIME("text/plain", "null");

  // EXTENSIONS

  CodeMirror.defineExtension = function (name, func) {
    CodeMirror.prototype[name] = func;
  };
  CodeMirror.defineDocExtension = function (name, func) {
    Doc.prototype[name] = func;
  };

  CodeMirror.fromTextArea = fromTextArea;

  addLegacyProps(CodeMirror);

  CodeMirror.version = "5.54.0";

  return CodeMirror;

})));


/***/ }),

/***/ "./node_modules/decimal.js/decimal.js":
/*!********************************************!*\
  !*** ./node_modules/decimal.js/decimal.js ***!
  \********************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

var __WEBPACK_AMD_DEFINE_RESULT__;;(function (globalScope) {
  'use strict';


  /*
   *  decimal.js v10.2.0
   *  An arbitrary-precision Decimal type for JavaScript.
   *  https://github.com/MikeMcl/decimal.js
   *  Copyright (c) 2019 Michael Mclaughlin <M8ch88l@gmail.com>
   *  MIT Licence
   */


  // -----------------------------------  EDITABLE DEFAULTS  ------------------------------------ //


    // The maximum exponent magnitude.
    // The limit on the value of `toExpNeg`, `toExpPos`, `minE` and `maxE`.
  var EXP_LIMIT = 9e15,                      // 0 to 9e15

    // The limit on the value of `precision`, and on the value of the first argument to
    // `toDecimalPlaces`, `toExponential`, `toFixed`, `toPrecision` and `toSignificantDigits`.
    MAX_DIGITS = 1e9,                        // 0 to 1e9

    // Base conversion alphabet.
    NUMERALS = '0123456789abcdef',

    // The natural logarithm of 10 (1025 digits).
    LN10 = '2.3025850929940456840179914546843642076011014886287729760333279009675726096773524802359972050895982983419677840422862486334095254650828067566662873690987816894829072083255546808437998948262331985283935053089653777326288461633662222876982198867465436674744042432743651550489343149393914796194044002221051017141748003688084012647080685567743216228355220114804663715659121373450747856947683463616792101806445070648000277502684916746550586856935673420670581136429224554405758925724208241314695689016758940256776311356919292033376587141660230105703089634572075440370847469940168269282808481184289314848524948644871927809676271275775397027668605952496716674183485704422507197965004714951050492214776567636938662976979522110718264549734772662425709429322582798502585509785265383207606726317164309505995087807523710333101197857547331541421808427543863591778117054309827482385045648019095610299291824318237525357709750539565187697510374970888692180205189339507238539205144634197265287286965110862571492198849978748873771345686209167058',

    // Pi (1025 digits).
    PI = '3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938446095505822317253594081284811174502841027019385211055596446229489549303819644288109756659334461284756482337867831652712019091456485669234603486104543266482133936072602491412737245870066063155881748815209209628292540917153643678925903600113305305488204665213841469519415116094330572703657595919530921861173819326117931051185480744623799627495673518857527248912279381830119491298336733624406566430860213949463952247371907021798609437027705392171762931767523846748184676694051320005681271452635608277857713427577896091736371787214684409012249534301465495853710507922796892589235420199561121290219608640344181598136297747713099605187072113499999983729780499510597317328160963185950244594553469083026425223082533446850352619311881710100031378387528865875332083814206171776691473035982534904287554687311595628638823537875937519577818577805321712268066130019278766111959092164201989380952572010654858632789',


    // The initial configuration properties of the Decimal constructor.
    DEFAULTS = {

      // These values must be integers within the stated ranges (inclusive).
      // Most of these values can be changed at run-time using the `Decimal.config` method.

      // The maximum number of significant digits of the result of a calculation or base conversion.
      // E.g. `Decimal.config({ precision: 20 });`
      precision: 20,                         // 1 to MAX_DIGITS

      // The rounding mode used when rounding to `precision`.
      //
      // ROUND_UP         0 Away from zero.
      // ROUND_DOWN       1 Towards zero.
      // ROUND_CEIL       2 Towards +Infinity.
      // ROUND_FLOOR      3 Towards -Infinity.
      // ROUND_HALF_UP    4 Towards nearest neighbour. If equidistant, up.
      // ROUND_HALF_DOWN  5 Towards nearest neighbour. If equidistant, down.
      // ROUND_HALF_EVEN  6 Towards nearest neighbour. If equidistant, towards even neighbour.
      // ROUND_HALF_CEIL  7 Towards nearest neighbour. If equidistant, towards +Infinity.
      // ROUND_HALF_FLOOR 8 Towards nearest neighbour. If equidistant, towards -Infinity.
      //
      // E.g.
      // `Decimal.rounding = 4;`
      // `Decimal.rounding = Decimal.ROUND_HALF_UP;`
      rounding: 4,                           // 0 to 8

      // The modulo mode used when calculating the modulus: a mod n.
      // The quotient (q = a / n) is calculated according to the corresponding rounding mode.
      // The remainder (r) is calculated as: r = a - n * q.
      //
      // UP         0 The remainder is positive if the dividend is negative, else is negative.
      // DOWN       1 The remainder has the same sign as the dividend (JavaScript %).
      // FLOOR      3 The remainder has the same sign as the divisor (Python %).
      // HALF_EVEN  6 The IEEE 754 remainder function.
      // EUCLID     9 Euclidian division. q = sign(n) * floor(a / abs(n)). Always positive.
      //
      // Truncated division (1), floored division (3), the IEEE 754 remainder (6), and Euclidian
      // division (9) are commonly used for the modulus operation. The other rounding modes can also
      // be used, but they may not give useful results.
      modulo: 1,                             // 0 to 9

      // The exponent value at and beneath which `toString` returns exponential notation.
      // JavaScript numbers: -7
      toExpNeg: -7,                          // 0 to -EXP_LIMIT

      // The exponent value at and above which `toString` returns exponential notation.
      // JavaScript numbers: 21
      toExpPos:  21,                         // 0 to EXP_LIMIT

      // The minimum exponent value, beneath which underflow to zero occurs.
      // JavaScript numbers: -324  (5e-324)
      minE: -EXP_LIMIT,                      // -1 to -EXP_LIMIT

      // The maximum exponent value, above which overflow to Infinity occurs.
      // JavaScript numbers: 308  (1.7976931348623157e+308)
      maxE: EXP_LIMIT,                       // 1 to EXP_LIMIT

      // Whether to use cryptographically-secure random number generation, if available.
      crypto: false                          // true/false
    },


  // ----------------------------------- END OF EDITABLE DEFAULTS ------------------------------- //


    Decimal, inexact, noConflict, quadrant,
    external = true,

    decimalError = '[DecimalError] ',
    invalidArgument = decimalError + 'Invalid argument: ',
    precisionLimitExceeded = decimalError + 'Precision limit exceeded',
    cryptoUnavailable = decimalError + 'crypto unavailable',

    mathfloor = Math.floor,
    mathpow = Math.pow,

    isBinary = /^0b([01]+(\.[01]*)?|\.[01]+)(p[+-]?\d+)?$/i,
    isHex = /^0x([0-9a-f]+(\.[0-9a-f]*)?|\.[0-9a-f]+)(p[+-]?\d+)?$/i,
    isOctal = /^0o([0-7]+(\.[0-7]*)?|\.[0-7]+)(p[+-]?\d+)?$/i,
    isDecimal = /^(\d+(\.\d*)?|\.\d+)(e[+-]?\d+)?$/i,

    BASE = 1e7,
    LOG_BASE = 7,
    MAX_SAFE_INTEGER = 9007199254740991,

    LN10_PRECISION = LN10.length - 1,
    PI_PRECISION = PI.length - 1,

    // Decimal.prototype object
    P = { name: '[object Decimal]' };


  // Decimal prototype methods


  /*
   *  absoluteValue             abs
   *  ceil
   *  comparedTo                cmp
   *  cosine                    cos
   *  cubeRoot                  cbrt
   *  decimalPlaces             dp
   *  dividedBy                 div
   *  dividedToIntegerBy        divToInt
   *  equals                    eq
   *  floor
   *  greaterThan               gt
   *  greaterThanOrEqualTo      gte
   *  hyperbolicCosine          cosh
   *  hyperbolicSine            sinh
   *  hyperbolicTangent         tanh
   *  inverseCosine             acos
   *  inverseHyperbolicCosine   acosh
   *  inverseHyperbolicSine     asinh
   *  inverseHyperbolicTangent  atanh
   *  inverseSine               asin
   *  inverseTangent            atan
   *  isFinite
   *  isInteger                 isInt
   *  isNaN
   *  isNegative                isNeg
   *  isPositive                isPos
   *  isZero
   *  lessThan                  lt
   *  lessThanOrEqualTo         lte
   *  logarithm                 log
   *  [maximum]                 [max]
   *  [minimum]                 [min]
   *  minus                     sub
   *  modulo                    mod
   *  naturalExponential        exp
   *  naturalLogarithm          ln
   *  negated                   neg
   *  plus                      add
   *  precision                 sd
   *  round
   *  sine                      sin
   *  squareRoot                sqrt
   *  tangent                   tan
   *  times                     mul
   *  toBinary
   *  toDecimalPlaces           toDP
   *  toExponential
   *  toFixed
   *  toFraction
   *  toHexadecimal             toHex
   *  toNearest
   *  toNumber
   *  toOctal
   *  toPower                   pow
   *  toPrecision
   *  toSignificantDigits       toSD
   *  toString
   *  truncated                 trunc
   *  valueOf                   toJSON
   */


  /*
   * Return a new Decimal whose value is the absolute value of this Decimal.
   *
   */
  P.absoluteValue = P.abs = function () {
    var x = new this.constructor(this);
    if (x.s < 0) x.s = 1;
    return finalise(x);
  };


  /*
   * Return a new Decimal whose value is the value of this Decimal rounded to a whole number in the
   * direction of positive Infinity.
   *
   */
  P.ceil = function () {
    return finalise(new this.constructor(this), this.e + 1, 2);
  };


  /*
   * Return
   *   1    if the value of this Decimal is greater than the value of `y`,
   *  -1    if the value of this Decimal is less than the value of `y`,
   *   0    if they have the same value,
   *   NaN  if the value of either Decimal is NaN.
   *
   */
  P.comparedTo = P.cmp = function (y) {
    var i, j, xdL, ydL,
      x = this,
      xd = x.d,
      yd = (y = new x.constructor(y)).d,
      xs = x.s,
      ys = y.s;

    // Either NaN or ±Infinity?
    if (!xd || !yd) {
      return !xs || !ys ? NaN : xs !== ys ? xs : xd === yd ? 0 : !xd ^ xs < 0 ? 1 : -1;
    }

    // Either zero?
    if (!xd[0] || !yd[0]) return xd[0] ? xs : yd[0] ? -ys : 0;

    // Signs differ?
    if (xs !== ys) return xs;

    // Compare exponents.
    if (x.e !== y.e) return x.e > y.e ^ xs < 0 ? 1 : -1;

    xdL = xd.length;
    ydL = yd.length;

    // Compare digit by digit.
    for (i = 0, j = xdL < ydL ? xdL : ydL; i < j; ++i) {
      if (xd[i] !== yd[i]) return xd[i] > yd[i] ^ xs < 0 ? 1 : -1;
    }

    // Compare lengths.
    return xdL === ydL ? 0 : xdL > ydL ^ xs < 0 ? 1 : -1;
  };


  /*
   * Return a new Decimal whose value is the cosine of the value in radians of this Decimal.
   *
   * Domain: [-Infinity, Infinity]
   * Range: [-1, 1]
   *
   * cos(0)         = 1
   * cos(-0)        = 1
   * cos(Infinity)  = NaN
   * cos(-Infinity) = NaN
   * cos(NaN)       = NaN
   *
   */
  P.cosine = P.cos = function () {
    var pr, rm,
      x = this,
      Ctor = x.constructor;

    if (!x.d) return new Ctor(NaN);

    // cos(0) = cos(-0) = 1
    if (!x.d[0]) return new Ctor(1);

    pr = Ctor.precision;
    rm = Ctor.rounding;
    Ctor.precision = pr + Math.max(x.e, x.sd()) + LOG_BASE;
    Ctor.rounding = 1;

    x = cosine(Ctor, toLessThanHalfPi(Ctor, x));

    Ctor.precision = pr;
    Ctor.rounding = rm;

    return finalise(quadrant == 2 || quadrant == 3 ? x.neg() : x, pr, rm, true);
  };


  /*
   *
   * Return a new Decimal whose value is the cube root of the value of this Decimal, rounded to
   * `precision` significant digits using rounding mode `rounding`.
   *
   *  cbrt(0)  =  0
   *  cbrt(-0) = -0
   *  cbrt(1)  =  1
   *  cbrt(-1) = -1
   *  cbrt(N)  =  N
   *  cbrt(-I) = -I
   *  cbrt(I)  =  I
   *
   * Math.cbrt(x) = (x < 0 ? -Math.pow(-x, 1/3) : Math.pow(x, 1/3))
   *
   */
  P.cubeRoot = P.cbrt = function () {
    var e, m, n, r, rep, s, sd, t, t3, t3plusx,
      x = this,
      Ctor = x.constructor;

    if (!x.isFinite() || x.isZero()) return new Ctor(x);
    external = false;

    // Initial estimate.
    s = x.s * mathpow(x.s * x, 1 / 3);

     // Math.cbrt underflow/overflow?
     // Pass x to Math.pow as integer, then adjust the exponent of the result.
    if (!s || Math.abs(s) == 1 / 0) {
      n = digitsToString(x.d);
      e = x.e;

      // Adjust n exponent so it is a multiple of 3 away from x exponent.
      if (s = (e - n.length + 1) % 3) n += (s == 1 || s == -2 ? '0' : '00');
      s = mathpow(n, 1 / 3);

      // Rarely, e may be one less than the result exponent value.
      e = mathfloor((e + 1) / 3) - (e % 3 == (e < 0 ? -1 : 2));

      if (s == 1 / 0) {
        n = '5e' + e;
      } else {
        n = s.toExponential();
        n = n.slice(0, n.indexOf('e') + 1) + e;
      }

      r = new Ctor(n);
      r.s = x.s;
    } else {
      r = new Ctor(s.toString());
    }

    sd = (e = Ctor.precision) + 3;

    // Halley's method.
    // TODO? Compare Newton's method.
    for (;;) {
      t = r;
      t3 = t.times(t).times(t);
      t3plusx = t3.plus(x);
      r = divide(t3plusx.plus(x).times(t), t3plusx.plus(t3), sd + 2, 1);

      // TODO? Replace with for-loop and checkRoundingDigits.
      if (digitsToString(t.d).slice(0, sd) === (n = digitsToString(r.d)).slice(0, sd)) {
        n = n.slice(sd - 3, sd + 1);

        // The 4th rounding digit may be in error by -1 so if the 4 rounding digits are 9999 or 4999
        // , i.e. approaching a rounding boundary, continue the iteration.
        if (n == '9999' || !rep && n == '4999') {

          // On the first iteration only, check to see if rounding up gives the exact result as the
          // nines may infinitely repeat.
          if (!rep) {
            finalise(t, e + 1, 0);

            if (t.times(t).times(t).eq(x)) {
              r = t;
              break;
            }
          }

          sd += 4;
          rep = 1;
        } else {

          // If the rounding digits are null, 0{0,4} or 50{0,3}, check for an exact result.
          // If not, then there are further digits and m will be truthy.
          if (!+n || !+n.slice(1) && n.charAt(0) == '5') {

            // Truncate to the first rounding digit.
            finalise(r, e + 1, 1);
            m = !r.times(r).times(r).eq(x);
          }

          break;
        }
      }
    }

    external = true;

    return finalise(r, e, Ctor.rounding, m);
  };


  /*
   * Return the number of decimal places of the value of this Decimal.
   *
   */
  P.decimalPlaces = P.dp = function () {
    var w,
      d = this.d,
      n = NaN;

    if (d) {
      w = d.length - 1;
      n = (w - mathfloor(this.e / LOG_BASE)) * LOG_BASE;

      // Subtract the number of trailing zeros of the last word.
      w = d[w];
      if (w) for (; w % 10 == 0; w /= 10) n--;
      if (n < 0) n = 0;
    }

    return n;
  };


  /*
   *  n / 0 = I
   *  n / N = N
   *  n / I = 0
   *  0 / n = 0
   *  0 / 0 = N
   *  0 / N = N
   *  0 / I = 0
   *  N / n = N
   *  N / 0 = N
   *  N / N = N
   *  N / I = N
   *  I / n = I
   *  I / 0 = I
   *  I / N = N
   *  I / I = N
   *
   * Return a new Decimal whose value is the value of this Decimal divided by `y`, rounded to
   * `precision` significant digits using rounding mode `rounding`.
   *
   */
  P.dividedBy = P.div = function (y) {
    return divide(this, new this.constructor(y));
  };


  /*
   * Return a new Decimal whose value is the integer part of dividing the value of this Decimal
   * by the value of `y`, rounded to `precision` significant digits using rounding mode `rounding`.
   *
   */
  P.dividedToIntegerBy = P.divToInt = function (y) {
    var x = this,
      Ctor = x.constructor;
    return finalise(divide(x, new Ctor(y), 0, 1, 1), Ctor.precision, Ctor.rounding);
  };


  /*
   * Return true if the value of this Decimal is equal to the value of `y`, otherwise return false.
   *
   */
  P.equals = P.eq = function (y) {
    return this.cmp(y) === 0;
  };


  /*
   * Return a new Decimal whose value is the value of this Decimal rounded to a whole number in the
   * direction of negative Infinity.
   *
   */
  P.floor = function () {
    return finalise(new this.constructor(this), this.e + 1, 3);
  };


  /*
   * Return true if the value of this Decimal is greater than the value of `y`, otherwise return
   * false.
   *
   */
  P.greaterThan = P.gt = function (y) {
    return this.cmp(y) > 0;
  };


  /*
   * Return true if the value of this Decimal is greater than or equal to the value of `y`,
   * otherwise return false.
   *
   */
  P.greaterThanOrEqualTo = P.gte = function (y) {
    var k = this.cmp(y);
    return k == 1 || k === 0;
  };


  /*
   * Return a new Decimal whose value is the hyperbolic cosine of the value in radians of this
   * Decimal.
   *
   * Domain: [-Infinity, Infinity]
   * Range: [1, Infinity]
   *
   * cosh(x) = 1 + x^2/2! + x^4/4! + x^6/6! + ...
   *
   * cosh(0)         = 1
   * cosh(-0)        = 1
   * cosh(Infinity)  = Infinity
   * cosh(-Infinity) = Infinity
   * cosh(NaN)       = NaN
   *
   *  x        time taken (ms)   result
   * 1000      9                 9.8503555700852349694e+433
   * 10000     25                4.4034091128314607936e+4342
   * 100000    171               1.4033316802130615897e+43429
   * 1000000   3817              1.5166076984010437725e+434294
   * 10000000  abandoned after 2 minute wait
   *
   * TODO? Compare performance of cosh(x) = 0.5 * (exp(x) + exp(-x))
   *
   */
  P.hyperbolicCosine = P.cosh = function () {
    var k, n, pr, rm, len,
      x = this,
      Ctor = x.constructor,
      one = new Ctor(1);

    if (!x.isFinite()) return new Ctor(x.s ? 1 / 0 : NaN);
    if (x.isZero()) return one;

    pr = Ctor.precision;
    rm = Ctor.rounding;
    Ctor.precision = pr + Math.max(x.e, x.sd()) + 4;
    Ctor.rounding = 1;
    len = x.d.length;

    // Argument reduction: cos(4x) = 1 - 8cos^2(x) + 8cos^4(x) + 1
    // i.e. cos(x) = 1 - cos^2(x/4)(8 - 8cos^2(x/4))

    // Estimate the optimum number of times to use the argument reduction.
    // TODO? Estimation reused from cosine() and may not be optimal here.
    if (len < 32) {
      k = Math.ceil(len / 3);
      n = (1 / tinyPow(4, k)).toString();
    } else {
      k = 16;
      n = '2.3283064365386962890625e-10';
    }

    x = taylorSeries(Ctor, 1, x.times(n), new Ctor(1), true);

    // Reverse argument reduction
    var cosh2_x,
      i = k,
      d8 = new Ctor(8);
    for (; i--;) {
      cosh2_x = x.times(x);
      x = one.minus(cosh2_x.times(d8.minus(cosh2_x.times(d8))));
    }

    return finalise(x, Ctor.precision = pr, Ctor.rounding = rm, true);
  };


  /*
   * Return a new Decimal whose value is the hyperbolic sine of the value in radians of this
   * Decimal.
   *
   * Domain: [-Infinity, Infinity]
   * Range: [-Infinity, Infinity]
   *
   * sinh(x) = x + x^3/3! + x^5/5! + x^7/7! + ...
   *
   * sinh(0)         = 0
   * sinh(-0)        = -0
   * sinh(Infinity)  = Infinity
   * sinh(-Infinity) = -Infinity
   * sinh(NaN)       = NaN
   *
   * x        time taken (ms)
   * 10       2 ms
   * 100      5 ms
   * 1000     14 ms
   * 10000    82 ms
   * 100000   886 ms            1.4033316802130615897e+43429
   * 200000   2613 ms
   * 300000   5407 ms
   * 400000   8824 ms
   * 500000   13026 ms          8.7080643612718084129e+217146
   * 1000000  48543 ms
   *
   * TODO? Compare performance of sinh(x) = 0.5 * (exp(x) - exp(-x))
   *
   */
  P.hyperbolicSine = P.sinh = function () {
    var k, pr, rm, len,
      x = this,
      Ctor = x.constructor;

    if (!x.isFinite() || x.isZero()) return new Ctor(x);

    pr = Ctor.precision;
    rm = Ctor.rounding;
    Ctor.precision = pr + Math.max(x.e, x.sd()) + 4;
    Ctor.rounding = 1;
    len = x.d.length;

    if (len < 3) {
      x = taylorSeries(Ctor, 2, x, x, true);
    } else {

      // Alternative argument reduction: sinh(3x) = sinh(x)(3 + 4sinh^2(x))
      // i.e. sinh(x) = sinh(x/3)(3 + 4sinh^2(x/3))
      // 3 multiplications and 1 addition

      // Argument reduction: sinh(5x) = sinh(x)(5 + sinh^2(x)(20 + 16sinh^2(x)))
      // i.e. sinh(x) = sinh(x/5)(5 + sinh^2(x/5)(20 + 16sinh^2(x/5)))
      // 4 multiplications and 2 additions

      // Estimate the optimum number of times to use the argument reduction.
      k = 1.4 * Math.sqrt(len);
      k = k > 16 ? 16 : k | 0;

      x = x.times(1 / tinyPow(5, k));
      x = taylorSeries(Ctor, 2, x, x, true);

      // Reverse argument reduction
      var sinh2_x,
        d5 = new Ctor(5),
        d16 = new Ctor(16),
        d20 = new Ctor(20);
      for (; k--;) {
        sinh2_x = x.times(x);
        x = x.times(d5.plus(sinh2_x.times(d16.times(sinh2_x).plus(d20))));
      }
    }

    Ctor.precision = pr;
    Ctor.rounding = rm;

    return finalise(x, pr, rm, true);
  };


  /*
   * Return a new Decimal whose value is the hyperbolic tangent of the value in radians of this
   * Decimal.
   *
   * Domain: [-Infinity, Infinity]
   * Range: [-1, 1]
   *
   * tanh(x) = sinh(x) / cosh(x)
   *
   * tanh(0)         = 0
   * tanh(-0)        = -0
   * tanh(Infinity)  = 1
   * tanh(-Infinity) = -1
   * tanh(NaN)       = NaN
   *
   */
  P.hyperbolicTangent = P.tanh = function () {
    var pr, rm,
      x = this,
      Ctor = x.constructor;

    if (!x.isFinite()) return new Ctor(x.s);
    if (x.isZero()) return new Ctor(x);

    pr = Ctor.precision;
    rm = Ctor.rounding;
    Ctor.precision = pr + 7;
    Ctor.rounding = 1;

    return divide(x.sinh(), x.cosh(), Ctor.precision = pr, Ctor.rounding = rm);
  };


  /*
   * Return a new Decimal whose value is the arccosine (inverse cosine) in radians of the value of
   * this Decimal.
   *
   * Domain: [-1, 1]
   * Range: [0, pi]
   *
   * acos(x) = pi/2 - asin(x)
   *
   * acos(0)       = pi/2
   * acos(-0)      = pi/2
   * acos(1)       = 0
   * acos(-1)      = pi
   * acos(1/2)     = pi/3
   * acos(-1/2)    = 2*pi/3
   * acos(|x| > 1) = NaN
   * acos(NaN)     = NaN
   *
   */
  P.inverseCosine = P.acos = function () {
    var halfPi,
      x = this,
      Ctor = x.constructor,
      k = x.abs().cmp(1),
      pr = Ctor.precision,
      rm = Ctor.rounding;

    if (k !== -1) {
      return k === 0
        // |x| is 1
        ? x.isNeg() ? getPi(Ctor, pr, rm) : new Ctor(0)
        // |x| > 1 or x is NaN
        : new Ctor(NaN);
    }

    if (x.isZero()) return getPi(Ctor, pr + 4, rm).times(0.5);

    // TODO? Special case acos(0.5) = pi/3 and acos(-0.5) = 2*pi/3

    Ctor.precision = pr + 6;
    Ctor.rounding = 1;

    x = x.asin();
    halfPi = getPi(Ctor, pr + 4, rm).times(0.5);

    Ctor.precision = pr;
    Ctor.rounding = rm;

    return halfPi.minus(x);
  };


  /*
   * Return a new Decimal whose value is the inverse of the hyperbolic cosine in radians of the
   * value of this Decimal.
   *
   * Domain: [1, Infinity]
   * Range: [0, Infinity]
   *
   * acosh(x) = ln(x + sqrt(x^2 - 1))
   *
   * acosh(x < 1)     = NaN
   * acosh(NaN)       = NaN
   * acosh(Infinity)  = Infinity
   * acosh(-Infinity) = NaN
   * acosh(0)         = NaN
   * acosh(-0)        = NaN
   * acosh(1)         = 0
   * acosh(-1)        = NaN
   *
   */
  P.inverseHyperbolicCosine = P.acosh = function () {
    var pr, rm,
      x = this,
      Ctor = x.constructor;

    if (x.lte(1)) return new Ctor(x.eq(1) ? 0 : NaN);
    if (!x.isFinite()) return new Ctor(x);

    pr = Ctor.precision;
    rm = Ctor.rounding;
    Ctor.precision = pr + Math.max(Math.abs(x.e), x.sd()) + 4;
    Ctor.rounding = 1;
    external = false;

    x = x.times(x).minus(1).sqrt().plus(x);

    external = true;
    Ctor.precision = pr;
    Ctor.rounding = rm;

    return x.ln();
  };


  /*
   * Return a new Decimal whose value is the inverse of the hyperbolic sine in radians of the value
   * of this Decimal.
   *
   * Domain: [-Infinity, Infinity]
   * Range: [-Infinity, Infinity]
   *
   * asinh(x) = ln(x + sqrt(x^2 + 1))
   *
   * asinh(NaN)       = NaN
   * asinh(Infinity)  = Infinity
   * asinh(-Infinity) = -Infinity
   * asinh(0)         = 0
   * asinh(-0)        = -0
   *
   */
  P.inverseHyperbolicSine = P.asinh = function () {
    var pr, rm,
      x = this,
      Ctor = x.constructor;

    if (!x.isFinite() || x.isZero()) return new Ctor(x);

    pr = Ctor.precision;
    rm = Ctor.rounding;
    Ctor.precision = pr + 2 * Math.max(Math.abs(x.e), x.sd()) + 6;
    Ctor.rounding = 1;
    external = false;

    x = x.times(x).plus(1).sqrt().plus(x);

    external = true;
    Ctor.precision = pr;
    Ctor.rounding = rm;

    return x.ln();
  };


  /*
   * Return a new Decimal whose value is the inverse of the hyperbolic tangent in radians of the
   * value of this Decimal.
   *
   * Domain: [-1, 1]
   * Range: [-Infinity, Infinity]
   *
   * atanh(x) = 0.5 * ln((1 + x) / (1 - x))
   *
   * atanh(|x| > 1)   = NaN
   * atanh(NaN)       = NaN
   * atanh(Infinity)  = NaN
   * atanh(-Infinity) = NaN
   * atanh(0)         = 0
   * atanh(-0)        = -0
   * atanh(1)         = Infinity
   * atanh(-1)        = -Infinity
   *
   */
  P.inverseHyperbolicTangent = P.atanh = function () {
    var pr, rm, wpr, xsd,
      x = this,
      Ctor = x.constructor;

    if (!x.isFinite()) return new Ctor(NaN);
    if (x.e >= 0) return new Ctor(x.abs().eq(1) ? x.s / 0 : x.isZero() ? x : NaN);

    pr = Ctor.precision;
    rm = Ctor.rounding;
    xsd = x.sd();

    if (Math.max(xsd, pr) < 2 * -x.e - 1) return finalise(new Ctor(x), pr, rm, true);

    Ctor.precision = wpr = xsd - x.e;

    x = divide(x.plus(1), new Ctor(1).minus(x), wpr + pr, 1);

    Ctor.precision = pr + 4;
    Ctor.rounding = 1;

    x = x.ln();

    Ctor.precision = pr;
    Ctor.rounding = rm;

    return x.times(0.5);
  };


  /*
   * Return a new Decimal whose value is the arcsine (inverse sine) in radians of the value of this
   * Decimal.
   *
   * Domain: [-Infinity, Infinity]
   * Range: [-pi/2, pi/2]
   *
   * asin(x) = 2*atan(x/(1 + sqrt(1 - x^2)))
   *
   * asin(0)       = 0
   * asin(-0)      = -0
   * asin(1/2)     = pi/6
   * asin(-1/2)    = -pi/6
   * asin(1)       = pi/2
   * asin(-1)      = -pi/2
   * asin(|x| > 1) = NaN
   * asin(NaN)     = NaN
   *
   * TODO? Compare performance of Taylor series.
   *
   */
  P.inverseSine = P.asin = function () {
    var halfPi, k,
      pr, rm,
      x = this,
      Ctor = x.constructor;

    if (x.isZero()) return new Ctor(x);

    k = x.abs().cmp(1);
    pr = Ctor.precision;
    rm = Ctor.rounding;

    if (k !== -1) {

      // |x| is 1
      if (k === 0) {
        halfPi = getPi(Ctor, pr + 4, rm).times(0.5);
        halfPi.s = x.s;
        return halfPi;
      }

      // |x| > 1 or x is NaN
      return new Ctor(NaN);
    }

    // TODO? Special case asin(1/2) = pi/6 and asin(-1/2) = -pi/6

    Ctor.precision = pr + 6;
    Ctor.rounding = 1;

    x = x.div(new Ctor(1).minus(x.times(x)).sqrt().plus(1)).atan();

    Ctor.precision = pr;
    Ctor.rounding = rm;

    return x.times(2);
  };


  /*
   * Return a new Decimal whose value is the arctangent (inverse tangent) in radians of the value
   * of this Decimal.
   *
   * Domain: [-Infinity, Infinity]
   * Range: [-pi/2, pi/2]
   *
   * atan(x) = x - x^3/3 + x^5/5 - x^7/7 + ...
   *
   * atan(0)         = 0
   * atan(-0)        = -0
   * atan(1)         = pi/4
   * atan(-1)        = -pi/4
   * atan(Infinity)  = pi/2
   * atan(-Infinity) = -pi/2
   * atan(NaN)       = NaN
   *
   */
  P.inverseTangent = P.atan = function () {
    var i, j, k, n, px, t, r, wpr, x2,
      x = this,
      Ctor = x.constructor,
      pr = Ctor.precision,
      rm = Ctor.rounding;

    if (!x.isFinite()) {
      if (!x.s) return new Ctor(NaN);
      if (pr + 4 <= PI_PRECISION) {
        r = getPi(Ctor, pr + 4, rm).times(0.5);
        r.s = x.s;
        return r;
      }
    } else if (x.isZero()) {
      return new Ctor(x);
    } else if (x.abs().eq(1) && pr + 4 <= PI_PRECISION) {
      r = getPi(Ctor, pr + 4, rm).times(0.25);
      r.s = x.s;
      return r;
    }

    Ctor.precision = wpr = pr + 10;
    Ctor.rounding = 1;

    // TODO? if (x >= 1 && pr <= PI_PRECISION) atan(x) = halfPi * x.s - atan(1 / x);

    // Argument reduction
    // Ensure |x| < 0.42
    // atan(x) = 2 * atan(x / (1 + sqrt(1 + x^2)))

    k = Math.min(28, wpr / LOG_BASE + 2 | 0);

    for (i = k; i; --i) x = x.div(x.times(x).plus(1).sqrt().plus(1));

    external = false;

    j = Math.ceil(wpr / LOG_BASE);
    n = 1;
    x2 = x.times(x);
    r = new Ctor(x);
    px = x;

    // atan(x) = x - x^3/3 + x^5/5 - x^7/7 + ...
    for (; i !== -1;) {
      px = px.times(x2);
      t = r.minus(px.div(n += 2));

      px = px.times(x2);
      r = t.plus(px.div(n += 2));

      if (r.d[j] !== void 0) for (i = j; r.d[i] === t.d[i] && i--;);
    }

    if (k) r = r.times(2 << (k - 1));

    external = true;

    return finalise(r, Ctor.precision = pr, Ctor.rounding = rm, true);
  };


  /*
   * Return true if the value of this Decimal is a finite number, otherwise return false.
   *
   */
  P.isFinite = function () {
    return !!this.d;
  };


  /*
   * Return true if the value of this Decimal is an integer, otherwise return false.
   *
   */
  P.isInteger = P.isInt = function () {
    return !!this.d && mathfloor(this.e / LOG_BASE) > this.d.length - 2;
  };


  /*
   * Return true if the value of this Decimal is NaN, otherwise return false.
   *
   */
  P.isNaN = function () {
    return !this.s;
  };


  /*
   * Return true if the value of this Decimal is negative, otherwise return false.
   *
   */
  P.isNegative = P.isNeg = function () {
    return this.s < 0;
  };


  /*
   * Return true if the value of this Decimal is positive, otherwise return false.
   *
   */
  P.isPositive = P.isPos = function () {
    return this.s > 0;
  };


  /*
   * Return true if the value of this Decimal is 0 or -0, otherwise return false.
   *
   */
  P.isZero = function () {
    return !!this.d && this.d[0] === 0;
  };


  /*
   * Return true if the value of this Decimal is less than `y`, otherwise return false.
   *
   */
  P.lessThan = P.lt = function (y) {
    return this.cmp(y) < 0;
  };


  /*
   * Return true if the value of this Decimal is less than or equal to `y`, otherwise return false.
   *
   */
  P.lessThanOrEqualTo = P.lte = function (y) {
    return this.cmp(y) < 1;
  };


  /*
   * Return the logarithm of the value of this Decimal to the specified base, rounded to `precision`
   * significant digits using rounding mode `rounding`.
   *
   * If no base is specified, return log[10](arg).
   *
   * log[base](arg) = ln(arg) / ln(base)
   *
   * The result will always be correctly rounded if the base of the log is 10, and 'almost always'
   * otherwise:
   *
   * Depending on the rounding mode, the result may be incorrectly rounded if the first fifteen
   * rounding digits are [49]99999999999999 or [50]00000000000000. In that case, the maximum error
   * between the result and the correctly rounded result will be one ulp (unit in the last place).
   *
   * log[-b](a)       = NaN
   * log[0](a)        = NaN
   * log[1](a)        = NaN
   * log[NaN](a)      = NaN
   * log[Infinity](a) = NaN
   * log[b](0)        = -Infinity
   * log[b](-0)       = -Infinity
   * log[b](-a)       = NaN
   * log[b](1)        = 0
   * log[b](Infinity) = Infinity
   * log[b](NaN)      = NaN
   *
   * [base] {number|string|Decimal} The base of the logarithm.
   *
   */
  P.logarithm = P.log = function (base) {
    var isBase10, d, denominator, k, inf, num, sd, r,
      arg = this,
      Ctor = arg.constructor,
      pr = Ctor.precision,
      rm = Ctor.rounding,
      guard = 5;

    // Default base is 10.
    if (base == null) {
      base = new Ctor(10);
      isBase10 = true;
    } else {
      base = new Ctor(base);
      d = base.d;

      // Return NaN if base is negative, or non-finite, or is 0 or 1.
      if (base.s < 0 || !d || !d[0] || base.eq(1)) return new Ctor(NaN);

      isBase10 = base.eq(10);
    }

    d = arg.d;

    // Is arg negative, non-finite, 0 or 1?
    if (arg.s < 0 || !d || !d[0] || arg.eq(1)) {
      return new Ctor(d && !d[0] ? -1 / 0 : arg.s != 1 ? NaN : d ? 0 : 1 / 0);
    }

    // The result will have a non-terminating decimal expansion if base is 10 and arg is not an
    // integer power of 10.
    if (isBase10) {
      if (d.length > 1) {
        inf = true;
      } else {
        for (k = d[0]; k % 10 === 0;) k /= 10;
        inf = k !== 1;
      }
    }

    external = false;
    sd = pr + guard;
    num = naturalLogarithm(arg, sd);
    denominator = isBase10 ? getLn10(Ctor, sd + 10) : naturalLogarithm(base, sd);

    // The result will have 5 rounding digits.
    r = divide(num, denominator, sd, 1);

    // If at a rounding boundary, i.e. the result's rounding digits are [49]9999 or [50]0000,
    // calculate 10 further digits.
    //
    // If the result is known to have an infinite decimal expansion, repeat this until it is clear
    // that the result is above or below the boundary. Otherwise, if after calculating the 10
    // further digits, the last 14 are nines, round up and assume the result is exact.
    // Also assume the result is exact if the last 14 are zero.
    //
    // Example of a result that will be incorrectly rounded:
    // log[1048576](4503599627370502) = 2.60000000000000009610279511444746...
    // The above result correctly rounded using ROUND_CEIL to 1 decimal place should be 2.7, but it
    // will be given as 2.6 as there are 15 zeros immediately after the requested decimal place, so
    // the exact result would be assumed to be 2.6, which rounded using ROUND_CEIL to 1 decimal
    // place is still 2.6.
    if (checkRoundingDigits(r.d, k = pr, rm)) {

      do {
        sd += 10;
        num = naturalLogarithm(arg, sd);
        denominator = isBase10 ? getLn10(Ctor, sd + 10) : naturalLogarithm(base, sd);
        r = divide(num, denominator, sd, 1);

        if (!inf) {

          // Check for 14 nines from the 2nd rounding digit, as the first may be 4.
          if (+digitsToString(r.d).slice(k + 1, k + 15) + 1 == 1e14) {
            r = finalise(r, pr + 1, 0);
          }

          break;
        }
      } while (checkRoundingDigits(r.d, k += 10, rm));
    }

    external = true;

    return finalise(r, pr, rm);
  };


  /*
   * Return a new Decimal whose value is the maximum of the arguments and the value of this Decimal.
   *
   * arguments {number|string|Decimal}
   *
  P.max = function () {
    Array.prototype.push.call(arguments, this);
    return maxOrMin(this.constructor, arguments, 'lt');
  };
   */


  /*
   * Return a new Decimal whose value is the minimum of the arguments and the value of this Decimal.
   *
   * arguments {number|string|Decimal}
   *
  P.min = function () {
    Array.prototype.push.call(arguments, this);
    return maxOrMin(this.constructor, arguments, 'gt');
  };
   */


  /*
   *  n - 0 = n
   *  n - N = N
   *  n - I = -I
   *  0 - n = -n
   *  0 - 0 = 0
   *  0 - N = N
   *  0 - I = -I
   *  N - n = N
   *  N - 0 = N
   *  N - N = N
   *  N - I = N
   *  I - n = I
   *  I - 0 = I
   *  I - N = N
   *  I - I = N
   *
   * Return a new Decimal whose value is the value of this Decimal minus `y`, rounded to `precision`
   * significant digits using rounding mode `rounding`.
   *
   */
  P.minus = P.sub = function (y) {
    var d, e, i, j, k, len, pr, rm, xd, xe, xLTy, yd,
      x = this,
      Ctor = x.constructor;

    y = new Ctor(y);

    // If either is not finite...
    if (!x.d || !y.d) {

      // Return NaN if either is NaN.
      if (!x.s || !y.s) y = new Ctor(NaN);

      // Return y negated if x is finite and y is ±Infinity.
      else if (x.d) y.s = -y.s;

      // Return x if y is finite and x is ±Infinity.
      // Return x if both are ±Infinity with different signs.
      // Return NaN if both are ±Infinity with the same sign.
      else y = new Ctor(y.d || x.s !== y.s ? x : NaN);

      return y;
    }

    // If signs differ...
    if (x.s != y.s) {
      y.s = -y.s;
      return x.plus(y);
    }

    xd = x.d;
    yd = y.d;
    pr = Ctor.precision;
    rm = Ctor.rounding;

    // If either is zero...
    if (!xd[0] || !yd[0]) {

      // Return y negated if x is zero and y is non-zero.
      if (yd[0]) y.s = -y.s;

      // Return x if y is zero and x is non-zero.
      else if (xd[0]) y = new Ctor(x);

      // Return zero if both are zero.
      // From IEEE 754 (2008) 6.3: 0 - 0 = -0 - -0 = -0 when rounding to -Infinity.
      else return new Ctor(rm === 3 ? -0 : 0);

      return external ? finalise(y, pr, rm) : y;
    }

    // x and y are finite, non-zero numbers with the same sign.

    // Calculate base 1e7 exponents.
    e = mathfloor(y.e / LOG_BASE);
    xe = mathfloor(x.e / LOG_BASE);

    xd = xd.slice();
    k = xe - e;

    // If base 1e7 exponents differ...
    if (k) {
      xLTy = k < 0;

      if (xLTy) {
        d = xd;
        k = -k;
        len = yd.length;
      } else {
        d = yd;
        e = xe;
        len = xd.length;
      }

      // Numbers with massively different exponents would result in a very high number of
      // zeros needing to be prepended, but this can be avoided while still ensuring correct
      // rounding by limiting the number of zeros to `Math.ceil(pr / LOG_BASE) + 2`.
      i = Math.max(Math.ceil(pr / LOG_BASE), len) + 2;

      if (k > i) {
        k = i;
        d.length = 1;
      }

      // Prepend zeros to equalise exponents.
      d.reverse();
      for (i = k; i--;) d.push(0);
      d.reverse();

    // Base 1e7 exponents equal.
    } else {

      // Check digits to determine which is the bigger number.

      i = xd.length;
      len = yd.length;
      xLTy = i < len;
      if (xLTy) len = i;

      for (i = 0; i < len; i++) {
        if (xd[i] != yd[i]) {
          xLTy = xd[i] < yd[i];
          break;
        }
      }

      k = 0;
    }

    if (xLTy) {
      d = xd;
      xd = yd;
      yd = d;
      y.s = -y.s;
    }

    len = xd.length;

    // Append zeros to `xd` if shorter.
    // Don't add zeros to `yd` if shorter as subtraction only needs to start at `yd` length.
    for (i = yd.length - len; i > 0; --i) xd[len++] = 0;

    // Subtract yd from xd.
    for (i = yd.length; i > k;) {

      if (xd[--i] < yd[i]) {
        for (j = i; j && xd[--j] === 0;) xd[j] = BASE - 1;
        --xd[j];
        xd[i] += BASE;
      }

      xd[i] -= yd[i];
    }

    // Remove trailing zeros.
    for (; xd[--len] === 0;) xd.pop();

    // Remove leading zeros and adjust exponent accordingly.
    for (; xd[0] === 0; xd.shift()) --e;

    // Zero?
    if (!xd[0]) return new Ctor(rm === 3 ? -0 : 0);

    y.d = xd;
    y.e = getBase10Exponent(xd, e);

    return external ? finalise(y, pr, rm) : y;
  };


  /*
   *   n % 0 =  N
   *   n % N =  N
   *   n % I =  n
   *   0 % n =  0
   *  -0 % n = -0
   *   0 % 0 =  N
   *   0 % N =  N
   *   0 % I =  0
   *   N % n =  N
   *   N % 0 =  N
   *   N % N =  N
   *   N % I =  N
   *   I % n =  N
   *   I % 0 =  N
   *   I % N =  N
   *   I % I =  N
   *
   * Return a new Decimal whose value is the value of this Decimal modulo `y`, rounded to
   * `precision` significant digits using rounding mode `rounding`.
   *
   * The result depends on the modulo mode.
   *
   */
  P.modulo = P.mod = function (y) {
    var q,
      x = this,
      Ctor = x.constructor;

    y = new Ctor(y);

    // Return NaN if x is ±Infinity or NaN, or y is NaN or ±0.
    if (!x.d || !y.s || y.d && !y.d[0]) return new Ctor(NaN);

    // Return x if y is ±Infinity or x is ±0.
    if (!y.d || x.d && !x.d[0]) {
      return finalise(new Ctor(x), Ctor.precision, Ctor.rounding);
    }

    // Prevent rounding of intermediate calculations.
    external = false;

    if (Ctor.modulo == 9) {

      // Euclidian division: q = sign(y) * floor(x / abs(y))
      // result = x - q * y    where  0 <= result < abs(y)
      q = divide(x, y.abs(), 0, 3, 1);
      q.s *= y.s;
    } else {
      q = divide(x, y, 0, Ctor.modulo, 1);
    }

    q = q.times(y);

    external = true;

    return x.minus(q);
  };


  /*
   * Return a new Decimal whose value is the natural exponential of the value of this Decimal,
   * i.e. the base e raised to the power the value of this Decimal, rounded to `precision`
   * significant digits using rounding mode `rounding`.
   *
   */
  P.naturalExponential = P.exp = function () {
    return naturalExponential(this);
  };


  /*
   * Return a new Decimal whose value is the natural logarithm of the value of this Decimal,
   * rounded to `precision` significant digits using rounding mode `rounding`.
   *
   */
  P.naturalLogarithm = P.ln = function () {
    return naturalLogarithm(this);
  };


  /*
   * Return a new Decimal whose value is the value of this Decimal negated, i.e. as if multiplied by
   * -1.
   *
   */
  P.negated = P.neg = function () {
    var x = new this.constructor(this);
    x.s = -x.s;
    return finalise(x);
  };


  /*
   *  n + 0 = n
   *  n + N = N
   *  n + I = I
   *  0 + n = n
   *  0 + 0 = 0
   *  0 + N = N
   *  0 + I = I
   *  N + n = N
   *  N + 0 = N
   *  N + N = N
   *  N + I = N
   *  I + n = I
   *  I + 0 = I
   *  I + N = N
   *  I + I = I
   *
   * Return a new Decimal whose value is the value of this Decimal plus `y`, rounded to `precision`
   * significant digits using rounding mode `rounding`.
   *
   */
  P.plus = P.add = function (y) {
    var carry, d, e, i, k, len, pr, rm, xd, yd,
      x = this,
      Ctor = x.constructor;

    y = new Ctor(y);

    // If either is not finite...
    if (!x.d || !y.d) {

      // Return NaN if either is NaN.
      if (!x.s || !y.s) y = new Ctor(NaN);

      // Return x if y is finite and x is ±Infinity.
      // Return x if both are ±Infinity with the same sign.
      // Return NaN if both are ±Infinity with different signs.
      // Return y if x is finite and y is ±Infinity.
      else if (!x.d) y = new Ctor(y.d || x.s === y.s ? x : NaN);

      return y;
    }

     // If signs differ...
    if (x.s != y.s) {
      y.s = -y.s;
      return x.minus(y);
    }

    xd = x.d;
    yd = y.d;
    pr = Ctor.precision;
    rm = Ctor.rounding;

    // If either is zero...
    if (!xd[0] || !yd[0]) {

      // Return x if y is zero.
      // Return y if y is non-zero.
      if (!yd[0]) y = new Ctor(x);

      return external ? finalise(y, pr, rm) : y;
    }

    // x and y are finite, non-zero numbers with the same sign.

    // Calculate base 1e7 exponents.
    k = mathfloor(x.e / LOG_BASE);
    e = mathfloor(y.e / LOG_BASE);

    xd = xd.slice();
    i = k - e;

    // If base 1e7 exponents differ...
    if (i) {

      if (i < 0) {
        d = xd;
        i = -i;
        len = yd.length;
      } else {
        d = yd;
        e = k;
        len = xd.length;
      }

      // Limit number of zeros prepended to max(ceil(pr / LOG_BASE), len) + 1.
      k = Math.ceil(pr / LOG_BASE);
      len = k > len ? k + 1 : len + 1;

      if (i > len) {
        i = len;
        d.length = 1;
      }

      // Prepend zeros to equalise exponents. Note: Faster to use reverse then do unshifts.
      d.reverse();
      for (; i--;) d.push(0);
      d.reverse();
    }

    len = xd.length;
    i = yd.length;

    // If yd is longer than xd, swap xd and yd so xd points to the longer array.
    if (len - i < 0) {
      i = len;
      d = yd;
      yd = xd;
      xd = d;
    }

    // Only start adding at yd.length - 1 as the further digits of xd can be left as they are.
    for (carry = 0; i;) {
      carry = (xd[--i] = xd[i] + yd[i] + carry) / BASE | 0;
      xd[i] %= BASE;
    }

    if (carry) {
      xd.unshift(carry);
      ++e;
    }

    // Remove trailing zeros.
    // No need to check for zero, as +x + +y != 0 && -x + -y != 0
    for (len = xd.length; xd[--len] == 0;) xd.pop();

    y.d = xd;
    y.e = getBase10Exponent(xd, e);

    return external ? finalise(y, pr, rm) : y;
  };


  /*
   * Return the number of significant digits of the value of this Decimal.
   *
   * [z] {boolean|number} Whether to count integer-part trailing zeros: true, false, 1 or 0.
   *
   */
  P.precision = P.sd = function (z) {
    var k,
      x = this;

    if (z !== void 0 && z !== !!z && z !== 1 && z !== 0) throw Error(invalidArgument + z);

    if (x.d) {
      k = getPrecision(x.d);
      if (z && x.e + 1 > k) k = x.e + 1;
    } else {
      k = NaN;
    }

    return k;
  };


  /*
   * Return a new Decimal whose value is the value of this Decimal rounded to a whole number using
   * rounding mode `rounding`.
   *
   */
  P.round = function () {
    var x = this,
      Ctor = x.constructor;

    return finalise(new Ctor(x), x.e + 1, Ctor.rounding);
  };


  /*
   * Return a new Decimal whose value is the sine of the value in radians of this Decimal.
   *
   * Domain: [-Infinity, Infinity]
   * Range: [-1, 1]
   *
   * sin(x) = x - x^3/3! + x^5/5! - ...
   *
   * sin(0)         = 0
   * sin(-0)        = -0
   * sin(Infinity)  = NaN
   * sin(-Infinity) = NaN
   * sin(NaN)       = NaN
   *
   */
  P.sine = P.sin = function () {
    var pr, rm,
      x = this,
      Ctor = x.constructor;

    if (!x.isFinite()) return new Ctor(NaN);
    if (x.isZero()) return new Ctor(x);

    pr = Ctor.precision;
    rm = Ctor.rounding;
    Ctor.precision = pr + Math.max(x.e, x.sd()) + LOG_BASE;
    Ctor.rounding = 1;

    x = sine(Ctor, toLessThanHalfPi(Ctor, x));

    Ctor.precision = pr;
    Ctor.rounding = rm;

    return finalise(quadrant > 2 ? x.neg() : x, pr, rm, true);
  };


  /*
   * Return a new Decimal whose value is the square root of this Decimal, rounded to `precision`
   * significant digits using rounding mode `rounding`.
   *
   *  sqrt(-n) =  N
   *  sqrt(N)  =  N
   *  sqrt(-I) =  N
   *  sqrt(I)  =  I
   *  sqrt(0)  =  0
   *  sqrt(-0) = -0
   *
   */
  P.squareRoot = P.sqrt = function () {
    var m, n, sd, r, rep, t,
      x = this,
      d = x.d,
      e = x.e,
      s = x.s,
      Ctor = x.constructor;

    // Negative/NaN/Infinity/zero?
    if (s !== 1 || !d || !d[0]) {
      return new Ctor(!s || s < 0 && (!d || d[0]) ? NaN : d ? x : 1 / 0);
    }

    external = false;

    // Initial estimate.
    s = Math.sqrt(+x);

    // Math.sqrt underflow/overflow?
    // Pass x to Math.sqrt as integer, then adjust the exponent of the result.
    if (s == 0 || s == 1 / 0) {
      n = digitsToString(d);

      if ((n.length + e) % 2 == 0) n += '0';
      s = Math.sqrt(n);
      e = mathfloor((e + 1) / 2) - (e < 0 || e % 2);

      if (s == 1 / 0) {
        n = '1e' + e;
      } else {
        n = s.toExponential();
        n = n.slice(0, n.indexOf('e') + 1) + e;
      }

      r = new Ctor(n);
    } else {
      r = new Ctor(s.toString());
    }

    sd = (e = Ctor.precision) + 3;

    // Newton-Raphson iteration.
    for (;;) {
      t = r;
      r = t.plus(divide(x, t, sd + 2, 1)).times(0.5);

      // TODO? Replace with for-loop and checkRoundingDigits.
      if (digitsToString(t.d).slice(0, sd) === (n = digitsToString(r.d)).slice(0, sd)) {
        n = n.slice(sd - 3, sd + 1);

        // The 4th rounding digit may be in error by -1 so if the 4 rounding digits are 9999 or
        // 4999, i.e. approaching a rounding boundary, continue the iteration.
        if (n == '9999' || !rep && n == '4999') {

          // On the first iteration only, check to see if rounding up gives the exact result as the
          // nines may infinitely repeat.
          if (!rep) {
            finalise(t, e + 1, 0);

            if (t.times(t).eq(x)) {
              r = t;
              break;
            }
          }

          sd += 4;
          rep = 1;
        } else {

          // If the rounding digits are null, 0{0,4} or 50{0,3}, check for an exact result.
          // If not, then there are further digits and m will be truthy.
          if (!+n || !+n.slice(1) && n.charAt(0) == '5') {

            // Truncate to the first rounding digit.
            finalise(r, e + 1, 1);
            m = !r.times(r).eq(x);
          }

          break;
        }
      }
    }

    external = true;

    return finalise(r, e, Ctor.rounding, m);
  };


  /*
   * Return a new Decimal whose value is the tangent of the value in radians of this Decimal.
   *
   * Domain: [-Infinity, Infinity]
   * Range: [-Infinity, Infinity]
   *
   * tan(0)         = 0
   * tan(-0)        = -0
   * tan(Infinity)  = NaN
   * tan(-Infinity) = NaN
   * tan(NaN)       = NaN
   *
   */
  P.tangent = P.tan = function () {
    var pr, rm,
      x = this,
      Ctor = x.constructor;

    if (!x.isFinite()) return new Ctor(NaN);
    if (x.isZero()) return new Ctor(x);

    pr = Ctor.precision;
    rm = Ctor.rounding;
    Ctor.precision = pr + 10;
    Ctor.rounding = 1;

    x = x.sin();
    x.s = 1;
    x = divide(x, new Ctor(1).minus(x.times(x)).sqrt(), pr + 10, 0);

    Ctor.precision = pr;
    Ctor.rounding = rm;

    return finalise(quadrant == 2 || quadrant == 4 ? x.neg() : x, pr, rm, true);
  };


  /*
   *  n * 0 = 0
   *  n * N = N
   *  n * I = I
   *  0 * n = 0
   *  0 * 0 = 0
   *  0 * N = N
   *  0 * I = N
   *  N * n = N
   *  N * 0 = N
   *  N * N = N
   *  N * I = N
   *  I * n = I
   *  I * 0 = N
   *  I * N = N
   *  I * I = I
   *
   * Return a new Decimal whose value is this Decimal times `y`, rounded to `precision` significant
   * digits using rounding mode `rounding`.
   *
   */
  P.times = P.mul = function (y) {
    var carry, e, i, k, r, rL, t, xdL, ydL,
      x = this,
      Ctor = x.constructor,
      xd = x.d,
      yd = (y = new Ctor(y)).d;

    y.s *= x.s;

     // If either is NaN, ±Infinity or ±0...
    if (!xd || !xd[0] || !yd || !yd[0]) {

      return new Ctor(!y.s || xd && !xd[0] && !yd || yd && !yd[0] && !xd

        // Return NaN if either is NaN.
        // Return NaN if x is ±0 and y is ±Infinity, or y is ±0 and x is ±Infinity.
        ? NaN

        // Return ±Infinity if either is ±Infinity.
        // Return ±0 if either is ±0.
        : !xd || !yd ? y.s / 0 : y.s * 0);
    }

    e = mathfloor(x.e / LOG_BASE) + mathfloor(y.e / LOG_BASE);
    xdL = xd.length;
    ydL = yd.length;

    // Ensure xd points to the longer array.
    if (xdL < ydL) {
      r = xd;
      xd = yd;
      yd = r;
      rL = xdL;
      xdL = ydL;
      ydL = rL;
    }

    // Initialise the result array with zeros.
    r = [];
    rL = xdL + ydL;
    for (i = rL; i--;) r.push(0);

    // Multiply!
    for (i = ydL; --i >= 0;) {
      carry = 0;
      for (k = xdL + i; k > i;) {
        t = r[k] + yd[i] * xd[k - i - 1] + carry;
        r[k--] = t % BASE | 0;
        carry = t / BASE | 0;
      }

      r[k] = (r[k] + carry) % BASE | 0;
    }

    // Remove trailing zeros.
    for (; !r[--rL];) r.pop();

    if (carry) ++e;
    else r.shift();

    y.d = r;
    y.e = getBase10Exponent(r, e);

    return external ? finalise(y, Ctor.precision, Ctor.rounding) : y;
  };


  /*
   * Return a string representing the value of this Decimal in base 2, round to `sd` significant
   * digits using rounding mode `rm`.
   *
   * If the optional `sd` argument is present then return binary exponential notation.
   *
   * [sd] {number} Significant digits. Integer, 1 to MAX_DIGITS inclusive.
   * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.
   *
   */
  P.toBinary = function (sd, rm) {
    return toStringBinary(this, 2, sd, rm);
  };


  /*
   * Return a new Decimal whose value is the value of this Decimal rounded to a maximum of `dp`
   * decimal places using rounding mode `rm` or `rounding` if `rm` is omitted.
   *
   * If `dp` is omitted, return a new Decimal whose value is the value of this Decimal.
   *
   * [dp] {number} Decimal places. Integer, 0 to MAX_DIGITS inclusive.
   * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.
   *
   */
  P.toDecimalPlaces = P.toDP = function (dp, rm) {
    var x = this,
      Ctor = x.constructor;

    x = new Ctor(x);
    if (dp === void 0) return x;

    checkInt32(dp, 0, MAX_DIGITS);

    if (rm === void 0) rm = Ctor.rounding;
    else checkInt32(rm, 0, 8);

    return finalise(x, dp + x.e + 1, rm);
  };


  /*
   * Return a string representing the value of this Decimal in exponential notation rounded to
   * `dp` fixed decimal places using rounding mode `rounding`.
   *
   * [dp] {number} Decimal places. Integer, 0 to MAX_DIGITS inclusive.
   * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.
   *
   */
  P.toExponential = function (dp, rm) {
    var str,
      x = this,
      Ctor = x.constructor;

    if (dp === void 0) {
      str = finiteToString(x, true);
    } else {
      checkInt32(dp, 0, MAX_DIGITS);

      if (rm === void 0) rm = Ctor.rounding;
      else checkInt32(rm, 0, 8);

      x = finalise(new Ctor(x), dp + 1, rm);
      str = finiteToString(x, true, dp + 1);
    }

    return x.isNeg() && !x.isZero() ? '-' + str : str;
  };


  /*
   * Return a string representing the value of this Decimal in normal (fixed-point) notation to
   * `dp` fixed decimal places and rounded using rounding mode `rm` or `rounding` if `rm` is
   * omitted.
   *
   * As with JavaScript numbers, (-0).toFixed(0) is '0', but e.g. (-0.00001).toFixed(0) is '-0'.
   *
   * [dp] {number} Decimal places. Integer, 0 to MAX_DIGITS inclusive.
   * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.
   *
   * (-0).toFixed(0) is '0', but (-0.1).toFixed(0) is '-0'.
   * (-0).toFixed(1) is '0.0', but (-0.01).toFixed(1) is '-0.0'.
   * (-0).toFixed(3) is '0.000'.
   * (-0.5).toFixed(0) is '-0'.
   *
   */
  P.toFixed = function (dp, rm) {
    var str, y,
      x = this,
      Ctor = x.constructor;

    if (dp === void 0) {
      str = finiteToString(x);
    } else {
      checkInt32(dp, 0, MAX_DIGITS);

      if (rm === void 0) rm = Ctor.rounding;
      else checkInt32(rm, 0, 8);

      y = finalise(new Ctor(x), dp + x.e + 1, rm);
      str = finiteToString(y, false, dp + y.e + 1);
    }

    // To determine whether to add the minus sign look at the value before it was rounded,
    // i.e. look at `x` rather than `y`.
    return x.isNeg() && !x.isZero() ? '-' + str : str;
  };


  /*
   * Return an array representing the value of this Decimal as a simple fraction with an integer
   * numerator and an integer denominator.
   *
   * The denominator will be a positive non-zero value less than or equal to the specified maximum
   * denominator. If a maximum denominator is not specified, the denominator will be the lowest
   * value necessary to represent the number exactly.
   *
   * [maxD] {number|string|Decimal} Maximum denominator. Integer >= 1 and < Infinity.
   *
   */
  P.toFraction = function (maxD) {
    var d, d0, d1, d2, e, k, n, n0, n1, pr, q, r,
      x = this,
      xd = x.d,
      Ctor = x.constructor;

    if (!xd) return new Ctor(x);

    n1 = d0 = new Ctor(1);
    d1 = n0 = new Ctor(0);

    d = new Ctor(d1);
    e = d.e = getPrecision(xd) - x.e - 1;
    k = e % LOG_BASE;
    d.d[0] = mathpow(10, k < 0 ? LOG_BASE + k : k);

    if (maxD == null) {

      // d is 10**e, the minimum max-denominator needed.
      maxD = e > 0 ? d : n1;
    } else {
      n = new Ctor(maxD);
      if (!n.isInt() || n.lt(n1)) throw Error(invalidArgument + n);
      maxD = n.gt(d) ? (e > 0 ? d : n1) : n;
    }

    external = false;
    n = new Ctor(digitsToString(xd));
    pr = Ctor.precision;
    Ctor.precision = e = xd.length * LOG_BASE * 2;

    for (;;)  {
      q = divide(n, d, 0, 1, 1);
      d2 = d0.plus(q.times(d1));
      if (d2.cmp(maxD) == 1) break;
      d0 = d1;
      d1 = d2;
      d2 = n1;
      n1 = n0.plus(q.times(d2));
      n0 = d2;
      d2 = d;
      d = n.minus(q.times(d2));
      n = d2;
    }

    d2 = divide(maxD.minus(d0), d1, 0, 1, 1);
    n0 = n0.plus(d2.times(n1));
    d0 = d0.plus(d2.times(d1));
    n0.s = n1.s = x.s;

    // Determine which fraction is closer to x, n0/d0 or n1/d1?
    r = divide(n1, d1, e, 1).minus(x).abs().cmp(divide(n0, d0, e, 1).minus(x).abs()) < 1
        ? [n1, d1] : [n0, d0];

    Ctor.precision = pr;
    external = true;

    return r;
  };


  /*
   * Return a string representing the value of this Decimal in base 16, round to `sd` significant
   * digits using rounding mode `rm`.
   *
   * If the optional `sd` argument is present then return binary exponential notation.
   *
   * [sd] {number} Significant digits. Integer, 1 to MAX_DIGITS inclusive.
   * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.
   *
   */
  P.toHexadecimal = P.toHex = function (sd, rm) {
    return toStringBinary(this, 16, sd, rm);
  };


  /*
   * Returns a new Decimal whose value is the nearest multiple of `y` in the direction of rounding
   * mode `rm`, or `Decimal.rounding` if `rm` is omitted, to the value of this Decimal.
   *
   * The return value will always have the same sign as this Decimal, unless either this Decimal
   * or `y` is NaN, in which case the return value will be also be NaN.
   *
   * The return value is not affected by the value of `precision`.
   *
   * y {number|string|Decimal} The magnitude to round to a multiple of.
   * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.
   *
   * 'toNearest() rounding mode not an integer: {rm}'
   * 'toNearest() rounding mode out of range: {rm}'
   *
   */
  P.toNearest = function (y, rm) {
    var x = this,
      Ctor = x.constructor;

    x = new Ctor(x);

    if (y == null) {

      // If x is not finite, return x.
      if (!x.d) return x;

      y = new Ctor(1);
      rm = Ctor.rounding;
    } else {
      y = new Ctor(y);
      if (rm === void 0) {
        rm = Ctor.rounding;
      } else {
        checkInt32(rm, 0, 8);
      }

      // If x is not finite, return x if y is not NaN, else NaN.
      if (!x.d) return y.s ? x : y;

      // If y is not finite, return Infinity with the sign of x if y is Infinity, else NaN.
      if (!y.d) {
        if (y.s) y.s = x.s;
        return y;
      }
    }

    // If y is not zero, calculate the nearest multiple of y to x.
    if (y.d[0]) {
      external = false;
      x = divide(x, y, 0, rm, 1).times(y);
      external = true;
      finalise(x);

    // If y is zero, return zero with the sign of x.
    } else {
      y.s = x.s;
      x = y;
    }

    return x;
  };


  /*
   * Return the value of this Decimal converted to a number primitive.
   * Zero keeps its sign.
   *
   */
  P.toNumber = function () {
    return +this;
  };


  /*
   * Return a string representing the value of this Decimal in base 8, round to `sd` significant
   * digits using rounding mode `rm`.
   *
   * If the optional `sd` argument is present then return binary exponential notation.
   *
   * [sd] {number} Significant digits. Integer, 1 to MAX_DIGITS inclusive.
   * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.
   *
   */
  P.toOctal = function (sd, rm) {
    return toStringBinary(this, 8, sd, rm);
  };


  /*
   * Return a new Decimal whose value is the value of this Decimal raised to the power `y`, rounded
   * to `precision` significant digits using rounding mode `rounding`.
   *
   * ECMAScript compliant.
   *
   *   pow(x, NaN)                           = NaN
   *   pow(x, ±0)                            = 1

   *   pow(NaN, non-zero)                    = NaN
   *   pow(abs(x) > 1, +Infinity)            = +Infinity
   *   pow(abs(x) > 1, -Infinity)            = +0
   *   pow(abs(x) == 1, ±Infinity)           = NaN
   *   pow(abs(x) < 1, +Infinity)            = +0
   *   pow(abs(x) < 1, -Infinity)            = +Infinity
   *   pow(+Infinity, y > 0)                 = +Infinity
   *   pow(+Infinity, y < 0)                 = +0
   *   pow(-Infinity, odd integer > 0)       = -Infinity
   *   pow(-Infinity, even integer > 0)      = +Infinity
   *   pow(-Infinity, odd integer < 0)       = -0
   *   pow(-Infinity, even integer < 0)      = +0
   *   pow(+0, y > 0)                        = +0
   *   pow(+0, y < 0)                        = +Infinity
   *   pow(-0, odd integer > 0)              = -0
   *   pow(-0, even integer > 0)             = +0
   *   pow(-0, odd integer < 0)              = -Infinity
   *   pow(-0, even integer < 0)             = +Infinity
   *   pow(finite x < 0, finite non-integer) = NaN
   *
   * For non-integer or very large exponents pow(x, y) is calculated using
   *
   *   x^y = exp(y*ln(x))
   *
   * Assuming the first 15 rounding digits are each equally likely to be any digit 0-9, the
   * probability of an incorrectly rounded result
   * P([49]9{14} | [50]0{14}) = 2 * 0.2 * 10^-14 = 4e-15 = 1/2.5e+14
   * i.e. 1 in 250,000,000,000,000
   *
   * If a result is incorrectly rounded the maximum error will be 1 ulp (unit in last place).
   *
   * y {number|string|Decimal} The power to which to raise this Decimal.
   *
   */
  P.toPower = P.pow = function (y) {
    var e, k, pr, r, rm, s,
      x = this,
      Ctor = x.constructor,
      yn = +(y = new Ctor(y));

    // Either ±Infinity, NaN or ±0?
    if (!x.d || !y.d || !x.d[0] || !y.d[0]) return new Ctor(mathpow(+x, yn));

    x = new Ctor(x);

    if (x.eq(1)) return x;

    pr = Ctor.precision;
    rm = Ctor.rounding;

    if (y.eq(1)) return finalise(x, pr, rm);

    // y exponent
    e = mathfloor(y.e / LOG_BASE);

    // If y is a small integer use the 'exponentiation by squaring' algorithm.
    if (e >= y.d.length - 1 && (k = yn < 0 ? -yn : yn) <= MAX_SAFE_INTEGER) {
      r = intPow(Ctor, x, k, pr);
      return y.s < 0 ? new Ctor(1).div(r) : finalise(r, pr, rm);
    }

    s = x.s;

    // if x is negative
    if (s < 0) {

      // if y is not an integer
      if (e < y.d.length - 1) return new Ctor(NaN);

      // Result is positive if x is negative and the last digit of integer y is even.
      if ((y.d[e] & 1) == 0) s = 1;

      // if x.eq(-1)
      if (x.e == 0 && x.d[0] == 1 && x.d.length == 1) {
        x.s = s;
        return x;
      }
    }

    // Estimate result exponent.
    // x^y = 10^e,  where e = y * log10(x)
    // log10(x) = log10(x_significand) + x_exponent
    // log10(x_significand) = ln(x_significand) / ln(10)
    k = mathpow(+x, yn);
    e = k == 0 || !isFinite(k)
      ? mathfloor(yn * (Math.log('0.' + digitsToString(x.d)) / Math.LN10 + x.e + 1))
      : new Ctor(k + '').e;

    // Exponent estimate may be incorrect e.g. x: 0.999999999999999999, y: 2.29, e: 0, r.e: -1.

    // Overflow/underflow?
    if (e > Ctor.maxE + 1 || e < Ctor.minE - 1) return new Ctor(e > 0 ? s / 0 : 0);

    external = false;
    Ctor.rounding = x.s = 1;

    // Estimate the extra guard digits needed to ensure five correct rounding digits from
    // naturalLogarithm(x). Example of failure without these extra digits (precision: 10):
    // new Decimal(2.32456).pow('2087987436534566.46411')
    // should be 1.162377823e+764914905173815, but is 1.162355823e+764914905173815
    k = Math.min(12, (e + '').length);

    // r = x^y = exp(y*ln(x))
    r = naturalExponential(y.times(naturalLogarithm(x, pr + k)), pr);

    // r may be Infinity, e.g. (0.9999999999999999).pow(-1e+40)
    if (r.d) {

      // Truncate to the required precision plus five rounding digits.
      r = finalise(r, pr + 5, 1);

      // If the rounding digits are [49]9999 or [50]0000 increase the precision by 10 and recalculate
      // the result.
      if (checkRoundingDigits(r.d, pr, rm)) {
        e = pr + 10;

        // Truncate to the increased precision plus five rounding digits.
        r = finalise(naturalExponential(y.times(naturalLogarithm(x, e + k)), e), e + 5, 1);

        // Check for 14 nines from the 2nd rounding digit (the first rounding digit may be 4 or 9).
        if (+digitsToString(r.d).slice(pr + 1, pr + 15) + 1 == 1e14) {
          r = finalise(r, pr + 1, 0);
        }
      }
    }

    r.s = s;
    external = true;
    Ctor.rounding = rm;

    return finalise(r, pr, rm);
  };


  /*
   * Return a string representing the value of this Decimal rounded to `sd` significant digits
   * using rounding mode `rounding`.
   *
   * Return exponential notation if `sd` is less than the number of digits necessary to represent
   * the integer part of the value in normal notation.
   *
   * [sd] {number} Significant digits. Integer, 1 to MAX_DIGITS inclusive.
   * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.
   *
   */
  P.toPrecision = function (sd, rm) {
    var str,
      x = this,
      Ctor = x.constructor;

    if (sd === void 0) {
      str = finiteToString(x, x.e <= Ctor.toExpNeg || x.e >= Ctor.toExpPos);
    } else {
      checkInt32(sd, 1, MAX_DIGITS);

      if (rm === void 0) rm = Ctor.rounding;
      else checkInt32(rm, 0, 8);

      x = finalise(new Ctor(x), sd, rm);
      str = finiteToString(x, sd <= x.e || x.e <= Ctor.toExpNeg, sd);
    }

    return x.isNeg() && !x.isZero() ? '-' + str : str;
  };


  /*
   * Return a new Decimal whose value is the value of this Decimal rounded to a maximum of `sd`
   * significant digits using rounding mode `rm`, or to `precision` and `rounding` respectively if
   * omitted.
   *
   * [sd] {number} Significant digits. Integer, 1 to MAX_DIGITS inclusive.
   * [rm] {number} Rounding mode. Integer, 0 to 8 inclusive.
   *
   * 'toSD() digits out of range: {sd}'
   * 'toSD() digits not an integer: {sd}'
   * 'toSD() rounding mode not an integer: {rm}'
   * 'toSD() rounding mode out of range: {rm}'
   *
   */
  P.toSignificantDigits = P.toSD = function (sd, rm) {
    var x = this,
      Ctor = x.constructor;

    if (sd === void 0) {
      sd = Ctor.precision;
      rm = Ctor.rounding;
    } else {
      checkInt32(sd, 1, MAX_DIGITS);

      if (rm === void 0) rm = Ctor.rounding;
      else checkInt32(rm, 0, 8);
    }

    return finalise(new Ctor(x), sd, rm);
  };


  /*
   * Return a string representing the value of this Decimal.
   *
   * Return exponential notation if this Decimal has a positive exponent equal to or greater than
   * `toExpPos`, or a negative exponent equal to or less than `toExpNeg`.
   *
   */
  P.toString = function () {
    var x = this,
      Ctor = x.constructor,
      str = finiteToString(x, x.e <= Ctor.toExpNeg || x.e >= Ctor.toExpPos);

    return x.isNeg() && !x.isZero() ? '-' + str : str;
  };


  /*
   * Return a new Decimal whose value is the value of this Decimal truncated to a whole number.
   *
   */
  P.truncated = P.trunc = function () {
    return finalise(new this.constructor(this), this.e + 1, 1);
  };


  /*
   * Return a string representing the value of this Decimal.
   * Unlike `toString`, negative zero will include the minus sign.
   *
   */
  P.valueOf = P.toJSON = function () {
    var x = this,
      Ctor = x.constructor,
      str = finiteToString(x, x.e <= Ctor.toExpNeg || x.e >= Ctor.toExpPos);

    return x.isNeg() ? '-' + str : str;
  };


  /*
  // Add aliases to match BigDecimal method names.
  // P.add = P.plus;
  P.subtract = P.minus;
  P.multiply = P.times;
  P.divide = P.div;
  P.remainder = P.mod;
  P.compareTo = P.cmp;
  P.negate = P.neg;
   */


  // Helper functions for Decimal.prototype (P) and/or Decimal methods, and their callers.


  /*
   *  digitsToString           P.cubeRoot, P.logarithm, P.squareRoot, P.toFraction, P.toPower,
   *                           finiteToString, naturalExponential, naturalLogarithm
   *  checkInt32               P.toDecimalPlaces, P.toExponential, P.toFixed, P.toNearest,
   *                           P.toPrecision, P.toSignificantDigits, toStringBinary, random
   *  checkRoundingDigits      P.logarithm, P.toPower, naturalExponential, naturalLogarithm
   *  convertBase              toStringBinary, parseOther
   *  cos                      P.cos
   *  divide                   P.atanh, P.cubeRoot, P.dividedBy, P.dividedToIntegerBy,
   *                           P.logarithm, P.modulo, P.squareRoot, P.tan, P.tanh, P.toFraction,
   *                           P.toNearest, toStringBinary, naturalExponential, naturalLogarithm,
   *                           taylorSeries, atan2, parseOther
   *  finalise                 P.absoluteValue, P.atan, P.atanh, P.ceil, P.cos, P.cosh,
   *                           P.cubeRoot, P.dividedToIntegerBy, P.floor, P.logarithm, P.minus,
   *                           P.modulo, P.negated, P.plus, P.round, P.sin, P.sinh, P.squareRoot,
   *                           P.tan, P.times, P.toDecimalPlaces, P.toExponential, P.toFixed,
   *                           P.toNearest, P.toPower, P.toPrecision, P.toSignificantDigits,
   *                           P.truncated, divide, getLn10, getPi, naturalExponential,
   *                           naturalLogarithm, ceil, floor, round, trunc
   *  finiteToString           P.toExponential, P.toFixed, P.toPrecision, P.toString, P.valueOf,
   *                           toStringBinary
   *  getBase10Exponent        P.minus, P.plus, P.times, parseOther
   *  getLn10                  P.logarithm, naturalLogarithm
   *  getPi                    P.acos, P.asin, P.atan, toLessThanHalfPi, atan2
   *  getPrecision             P.precision, P.toFraction
   *  getZeroString            digitsToString, finiteToString
   *  intPow                   P.toPower, parseOther
   *  isOdd                    toLessThanHalfPi
   *  maxOrMin                 max, min
   *  naturalExponential       P.naturalExponential, P.toPower
   *  naturalLogarithm         P.acosh, P.asinh, P.atanh, P.logarithm, P.naturalLogarithm,
   *                           P.toPower, naturalExponential
   *  nonFiniteToString        finiteToString, toStringBinary
   *  parseDecimal             Decimal
   *  parseOther               Decimal
   *  sin                      P.sin
   *  taylorSeries             P.cosh, P.sinh, cos, sin
   *  toLessThanHalfPi         P.cos, P.sin
   *  toStringBinary           P.toBinary, P.toHexadecimal, P.toOctal
   *  truncate                 intPow
   *
   *  Throws:                  P.logarithm, P.precision, P.toFraction, checkInt32, getLn10, getPi,
   *                           naturalLogarithm, config, parseOther, random, Decimal
   */


  function digitsToString(d) {
    var i, k, ws,
      indexOfLastWord = d.length - 1,
      str = '',
      w = d[0];

    if (indexOfLastWord > 0) {
      str += w;
      for (i = 1; i < indexOfLastWord; i++) {
        ws = d[i] + '';
        k = LOG_BASE - ws.length;
        if (k) str += getZeroString(k);
        str += ws;
      }

      w = d[i];
      ws = w + '';
      k = LOG_BASE - ws.length;
      if (k) str += getZeroString(k);
    } else if (w === 0) {
      return '0';
    }

    // Remove trailing zeros of last w.
    for (; w % 10 === 0;) w /= 10;

    return str + w;
  }


  function checkInt32(i, min, max) {
    if (i !== ~~i || i < min || i > max) {
      throw Error(invalidArgument + i);
    }
  }


  /*
   * Check 5 rounding digits if `repeating` is null, 4 otherwise.
   * `repeating == null` if caller is `log` or `pow`,
   * `repeating != null` if caller is `naturalLogarithm` or `naturalExponential`.
   */
  function checkRoundingDigits(d, i, rm, repeating) {
    var di, k, r, rd;

    // Get the length of the first word of the array d.
    for (k = d[0]; k >= 10; k /= 10) --i;

    // Is the rounding digit in the first word of d?
    if (--i < 0) {
      i += LOG_BASE;
      di = 0;
    } else {
      di = Math.ceil((i + 1) / LOG_BASE);
      i %= LOG_BASE;
    }

    // i is the index (0 - 6) of the rounding digit.
    // E.g. if within the word 3487563 the first rounding digit is 5,
    // then i = 4, k = 1000, rd = 3487563 % 1000 = 563
    k = mathpow(10, LOG_BASE - i);
    rd = d[di] % k | 0;

    if (repeating == null) {
      if (i < 3) {
        if (i == 0) rd = rd / 100 | 0;
        else if (i == 1) rd = rd / 10 | 0;
        r = rm < 4 && rd == 99999 || rm > 3 && rd == 49999 || rd == 50000 || rd == 0;
      } else {
        r = (rm < 4 && rd + 1 == k || rm > 3 && rd + 1 == k / 2) &&
          (d[di + 1] / k / 100 | 0) == mathpow(10, i - 2) - 1 ||
            (rd == k / 2 || rd == 0) && (d[di + 1] / k / 100 | 0) == 0;
      }
    } else {
      if (i < 4) {
        if (i == 0) rd = rd / 1000 | 0;
        else if (i == 1) rd = rd / 100 | 0;
        else if (i == 2) rd = rd / 10 | 0;
        r = (repeating || rm < 4) && rd == 9999 || !repeating && rm > 3 && rd == 4999;
      } else {
        r = ((repeating || rm < 4) && rd + 1 == k ||
        (!repeating && rm > 3) && rd + 1 == k / 2) &&
          (d[di + 1] / k / 1000 | 0) == mathpow(10, i - 3) - 1;
      }
    }

    return r;
  }


  // Convert string of `baseIn` to an array of numbers of `baseOut`.
  // Eg. convertBase('255', 10, 16) returns [15, 15].
  // Eg. convertBase('ff', 16, 10) returns [2, 5, 5].
  function convertBase(str, baseIn, baseOut) {
    var j,
      arr = [0],
      arrL,
      i = 0,
      strL = str.length;

    for (; i < strL;) {
      for (arrL = arr.length; arrL--;) arr[arrL] *= baseIn;
      arr[0] += NUMERALS.indexOf(str.charAt(i++));
      for (j = 0; j < arr.length; j++) {
        if (arr[j] > baseOut - 1) {
          if (arr[j + 1] === void 0) arr[j + 1] = 0;
          arr[j + 1] += arr[j] / baseOut | 0;
          arr[j] %= baseOut;
        }
      }
    }

    return arr.reverse();
  }


  /*
   * cos(x) = 1 - x^2/2! + x^4/4! - ...
   * |x| < pi/2
   *
   */
  function cosine(Ctor, x) {
    var k, y,
      len = x.d.length;

    // Argument reduction: cos(4x) = 8*(cos^4(x) - cos^2(x)) + 1
    // i.e. cos(x) = 8*(cos^4(x/4) - cos^2(x/4)) + 1

    // Estimate the optimum number of times to use the argument reduction.
    if (len < 32) {
      k = Math.ceil(len / 3);
      y = (1 / tinyPow(4, k)).toString();
    } else {
      k = 16;
      y = '2.3283064365386962890625e-10';
    }

    Ctor.precision += k;

    x = taylorSeries(Ctor, 1, x.times(y), new Ctor(1));

    // Reverse argument reduction
    for (var i = k; i--;) {
      var cos2x = x.times(x);
      x = cos2x.times(cos2x).minus(cos2x).times(8).plus(1);
    }

    Ctor.precision -= k;

    return x;
  }


  /*
   * Perform division in the specified base.
   */
  var divide = (function () {

    // Assumes non-zero x and k, and hence non-zero result.
    function multiplyInteger(x, k, base) {
      var temp,
        carry = 0,
        i = x.length;

      for (x = x.slice(); i--;) {
        temp = x[i] * k + carry;
        x[i] = temp % base | 0;
        carry = temp / base | 0;
      }

      if (carry) x.unshift(carry);

      return x;
    }

    function compare(a, b, aL, bL) {
      var i, r;

      if (aL != bL) {
        r = aL > bL ? 1 : -1;
      } else {
        for (i = r = 0; i < aL; i++) {
          if (a[i] != b[i]) {
            r = a[i] > b[i] ? 1 : -1;
            break;
          }
        }
      }

      return r;
    }

    function subtract(a, b, aL, base) {
      var i = 0;

      // Subtract b from a.
      for (; aL--;) {
        a[aL] -= i;
        i = a[aL] < b[aL] ? 1 : 0;
        a[aL] = i * base + a[aL] - b[aL];
      }

      // Remove leading zeros.
      for (; !a[0] && a.length > 1;) a.shift();
    }

    return function (x, y, pr, rm, dp, base) {
      var cmp, e, i, k, logBase, more, prod, prodL, q, qd, rem, remL, rem0, sd, t, xi, xL, yd0,
        yL, yz,
        Ctor = x.constructor,
        sign = x.s == y.s ? 1 : -1,
        xd = x.d,
        yd = y.d;

      // Either NaN, Infinity or 0?
      if (!xd || !xd[0] || !yd || !yd[0]) {

        return new Ctor(// Return NaN if either NaN, or both Infinity or 0.
          !x.s || !y.s || (xd ? yd && xd[0] == yd[0] : !yd) ? NaN :

          // Return ±0 if x is 0 or y is ±Infinity, or return ±Infinity as y is 0.
          xd && xd[0] == 0 || !yd ? sign * 0 : sign / 0);
      }

      if (base) {
        logBase = 1;
        e = x.e - y.e;
      } else {
        base = BASE;
        logBase = LOG_BASE;
        e = mathfloor(x.e / logBase) - mathfloor(y.e / logBase);
      }

      yL = yd.length;
      xL = xd.length;
      q = new Ctor(sign);
      qd = q.d = [];

      // Result exponent may be one less than e.
      // The digit array of a Decimal from toStringBinary may have trailing zeros.
      for (i = 0; yd[i] == (xd[i] || 0); i++);

      if (yd[i] > (xd[i] || 0)) e--;

      if (pr == null) {
        sd = pr = Ctor.precision;
        rm = Ctor.rounding;
      } else if (dp) {
        sd = pr + (x.e - y.e) + 1;
      } else {
        sd = pr;
      }

      if (sd < 0) {
        qd.push(1);
        more = true;
      } else {

        // Convert precision in number of base 10 digits to base 1e7 digits.
        sd = sd / logBase + 2 | 0;
        i = 0;

        // divisor < 1e7
        if (yL == 1) {
          k = 0;
          yd = yd[0];
          sd++;

          // k is the carry.
          for (; (i < xL || k) && sd--; i++) {
            t = k * base + (xd[i] || 0);
            qd[i] = t / yd | 0;
            k = t % yd | 0;
          }

          more = k || i < xL;

        // divisor >= 1e7
        } else {

          // Normalise xd and yd so highest order digit of yd is >= base/2
          k = base / (yd[0] + 1) | 0;

          if (k > 1) {
            yd = multiplyInteger(yd, k, base);
            xd = multiplyInteger(xd, k, base);
            yL = yd.length;
            xL = xd.length;
          }

          xi = yL;
          rem = xd.slice(0, yL);
          remL = rem.length;

          // Add zeros to make remainder as long as divisor.
          for (; remL < yL;) rem[remL++] = 0;

          yz = yd.slice();
          yz.unshift(0);
          yd0 = yd[0];

          if (yd[1] >= base / 2) ++yd0;

          do {
            k = 0;

            // Compare divisor and remainder.
            cmp = compare(yd, rem, yL, remL);

            // If divisor < remainder.
            if (cmp < 0) {

              // Calculate trial digit, k.
              rem0 = rem[0];
              if (yL != remL) rem0 = rem0 * base + (rem[1] || 0);

              // k will be how many times the divisor goes into the current remainder.
              k = rem0 / yd0 | 0;

              //  Algorithm:
              //  1. product = divisor * trial digit (k)
              //  2. if product > remainder: product -= divisor, k--
              //  3. remainder -= product
              //  4. if product was < remainder at 2:
              //    5. compare new remainder and divisor
              //    6. If remainder > divisor: remainder -= divisor, k++

              if (k > 1) {
                if (k >= base) k = base - 1;

                // product = divisor * trial digit.
                prod = multiplyInteger(yd, k, base);
                prodL = prod.length;
                remL = rem.length;

                // Compare product and remainder.
                cmp = compare(prod, rem, prodL, remL);

                // product > remainder.
                if (cmp == 1) {
                  k--;

                  // Subtract divisor from product.
                  subtract(prod, yL < prodL ? yz : yd, prodL, base);
                }
              } else {

                // cmp is -1.
                // If k is 0, there is no need to compare yd and rem again below, so change cmp to 1
                // to avoid it. If k is 1 there is a need to compare yd and rem again below.
                if (k == 0) cmp = k = 1;
                prod = yd.slice();
              }

              prodL = prod.length;
              if (prodL < remL) prod.unshift(0);

              // Subtract product from remainder.
              subtract(rem, prod, remL, base);

              // If product was < previous remainder.
              if (cmp == -1) {
                remL = rem.length;

                // Compare divisor and new remainder.
                cmp = compare(yd, rem, yL, remL);

                // If divisor < new remainder, subtract divisor from remainder.
                if (cmp < 1) {
                  k++;

                  // Subtract divisor from remainder.
                  subtract(rem, yL < remL ? yz : yd, remL, base);
                }
              }

              remL = rem.length;
            } else if (cmp === 0) {
              k++;
              rem = [0];
            }    // if cmp === 1, k will be 0

            // Add the next digit, k, to the result array.
            qd[i++] = k;

            // Update the remainder.
            if (cmp && rem[0]) {
              rem[remL++] = xd[xi] || 0;
            } else {
              rem = [xd[xi]];
              remL = 1;
            }

          } while ((xi++ < xL || rem[0] !== void 0) && sd--);

          more = rem[0] !== void 0;
        }

        // Leading zero?
        if (!qd[0]) qd.shift();
      }

      // logBase is 1 when divide is being used for base conversion.
      if (logBase == 1) {
        q.e = e;
        inexact = more;
      } else {

        // To calculate q.e, first get the number of digits of qd[0].
        for (i = 1, k = qd[0]; k >= 10; k /= 10) i++;
        q.e = i + e * logBase - 1;

        finalise(q, dp ? pr + q.e + 1 : pr, rm, more);
      }

      return q;
    };
  })();


  /*
   * Round `x` to `sd` significant digits using rounding mode `rm`.
   * Check for over/under-flow.
   */
   function finalise(x, sd, rm, isTruncated) {
    var digits, i, j, k, rd, roundUp, w, xd, xdi,
      Ctor = x.constructor;

    // Don't round if sd is null or undefined.
    out: if (sd != null) {
      xd = x.d;

      // Infinity/NaN.
      if (!xd) return x;

      // rd: the rounding digit, i.e. the digit after the digit that may be rounded up.
      // w: the word of xd containing rd, a base 1e7 number.
      // xdi: the index of w within xd.
      // digits: the number of digits of w.
      // i: what would be the index of rd within w if all the numbers were 7 digits long (i.e. if
      // they had leading zeros)
      // j: if > 0, the actual index of rd within w (if < 0, rd is a leading zero).

      // Get the length of the first word of the digits array xd.
      for (digits = 1, k = xd[0]; k >= 10; k /= 10) digits++;
      i = sd - digits;

      // Is the rounding digit in the first word of xd?
      if (i < 0) {
        i += LOG_BASE;
        j = sd;
        w = xd[xdi = 0];

        // Get the rounding digit at index j of w.
        rd = w / mathpow(10, digits - j - 1) % 10 | 0;
      } else {
        xdi = Math.ceil((i + 1) / LOG_BASE);
        k = xd.length;
        if (xdi >= k) {
          if (isTruncated) {

            // Needed by `naturalExponential`, `naturalLogarithm` and `squareRoot`.
            for (; k++ <= xdi;) xd.push(0);
            w = rd = 0;
            digits = 1;
            i %= LOG_BASE;
            j = i - LOG_BASE + 1;
          } else {
            break out;
          }
        } else {
          w = k = xd[xdi];

          // Get the number of digits of w.
          for (digits = 1; k >= 10; k /= 10) digits++;

          // Get the index of rd within w.
          i %= LOG_BASE;

          // Get the index of rd within w, adjusted for leading zeros.
          // The number of leading zeros of w is given by LOG_BASE - digits.
          j = i - LOG_BASE + digits;

          // Get the rounding digit at index j of w.
          rd = j < 0 ? 0 : w / mathpow(10, digits - j - 1) % 10 | 0;
        }
      }

      // Are there any non-zero digits after the rounding digit?
      isTruncated = isTruncated || sd < 0 ||
        xd[xdi + 1] !== void 0 || (j < 0 ? w : w % mathpow(10, digits - j - 1));

      // The expression `w % mathpow(10, digits - j - 1)` returns all the digits of w to the right
      // of the digit at (left-to-right) index j, e.g. if w is 908714 and j is 2, the expression
      // will give 714.

      roundUp = rm < 4
        ? (rd || isTruncated) && (rm == 0 || rm == (x.s < 0 ? 3 : 2))
        : rd > 5 || rd == 5 && (rm == 4 || isTruncated || rm == 6 &&

          // Check whether the digit to the left of the rounding digit is odd.
          ((i > 0 ? j > 0 ? w / mathpow(10, digits - j) : 0 : xd[xdi - 1]) % 10) & 1 ||
            rm == (x.s < 0 ? 8 : 7));

      if (sd < 1 || !xd[0]) {
        xd.length = 0;
        if (roundUp) {

          // Convert sd to decimal places.
          sd -= x.e + 1;

          // 1, 0.1, 0.01, 0.001, 0.0001 etc.
          xd[0] = mathpow(10, (LOG_BASE - sd % LOG_BASE) % LOG_BASE);
          x.e = -sd || 0;
        } else {

          // Zero.
          xd[0] = x.e = 0;
        }

        return x;
      }

      // Remove excess digits.
      if (i == 0) {
        xd.length = xdi;
        k = 1;
        xdi--;
      } else {
        xd.length = xdi + 1;
        k = mathpow(10, LOG_BASE - i);

        // E.g. 56700 becomes 56000 if 7 is the rounding digit.
        // j > 0 means i > number of leading zeros of w.
        xd[xdi] = j > 0 ? (w / mathpow(10, digits - j) % mathpow(10, j) | 0) * k : 0;
      }

      if (roundUp) {
        for (;;) {

          // Is the digit to be rounded up in the first word of xd?
          if (xdi == 0) {

            // i will be the length of xd[0] before k is added.
            for (i = 1, j = xd[0]; j >= 10; j /= 10) i++;
            j = xd[0] += k;
            for (k = 1; j >= 10; j /= 10) k++;

            // if i != k the length has increased.
            if (i != k) {
              x.e++;
              if (xd[0] == BASE) xd[0] = 1;
            }

            break;
          } else {
            xd[xdi] += k;
            if (xd[xdi] != BASE) break;
            xd[xdi--] = 0;
            k = 1;
          }
        }
      }

      // Remove trailing zeros.
      for (i = xd.length; xd[--i] === 0;) xd.pop();
    }

    if (external) {

      // Overflow?
      if (x.e > Ctor.maxE) {

        // Infinity.
        x.d = null;
        x.e = NaN;

      // Underflow?
      } else if (x.e < Ctor.minE) {

        // Zero.
        x.e = 0;
        x.d = [0];
        // Ctor.underflow = true;
      } // else Ctor.underflow = false;
    }

    return x;
  }


  function finiteToString(x, isExp, sd) {
    if (!x.isFinite()) return nonFiniteToString(x);
    var k,
      e = x.e,
      str = digitsToString(x.d),
      len = str.length;

    if (isExp) {
      if (sd && (k = sd - len) > 0) {
        str = str.charAt(0) + '.' + str.slice(1) + getZeroString(k);
      } else if (len > 1) {
        str = str.charAt(0) + '.' + str.slice(1);
      }

      str = str + (x.e < 0 ? 'e' : 'e+') + x.e;
    } else if (e < 0) {
      str = '0.' + getZeroString(-e - 1) + str;
      if (sd && (k = sd - len) > 0) str += getZeroString(k);
    } else if (e >= len) {
      str += getZeroString(e + 1 - len);
      if (sd && (k = sd - e - 1) > 0) str = str + '.' + getZeroString(k);
    } else {
      if ((k = e + 1) < len) str = str.slice(0, k) + '.' + str.slice(k);
      if (sd && (k = sd - len) > 0) {
        if (e + 1 === len) str += '.';
        str += getZeroString(k);
      }
    }

    return str;
  }


  // Calculate the base 10 exponent from the base 1e7 exponent.
  function getBase10Exponent(digits, e) {
    var w = digits[0];

    // Add the number of digits of the first word of the digits array.
    for ( e *= LOG_BASE; w >= 10; w /= 10) e++;
    return e;
  }


  function getLn10(Ctor, sd, pr) {
    if (sd > LN10_PRECISION) {

      // Reset global state in case the exception is caught.
      external = true;
      if (pr) Ctor.precision = pr;
      throw Error(precisionLimitExceeded);
    }
    return finalise(new Ctor(LN10), sd, 1, true);
  }


  function getPi(Ctor, sd, rm) {
    if (sd > PI_PRECISION) throw Error(precisionLimitExceeded);
    return finalise(new Ctor(PI), sd, rm, true);
  }


  function getPrecision(digits) {
    var w = digits.length - 1,
      len = w * LOG_BASE + 1;

    w = digits[w];

    // If non-zero...
    if (w) {

      // Subtract the number of trailing zeros of the last word.
      for (; w % 10 == 0; w /= 10) len--;

      // Add the number of digits of the first word.
      for (w = digits[0]; w >= 10; w /= 10) len++;
    }

    return len;
  }


  function getZeroString(k) {
    var zs = '';
    for (; k--;) zs += '0';
    return zs;
  }


  /*
   * Return a new Decimal whose value is the value of Decimal `x` to the power `n`, where `n` is an
   * integer of type number.
   *
   * Implements 'exponentiation by squaring'. Called by `pow` and `parseOther`.
   *
   */
  function intPow(Ctor, x, n, pr) {
    var isTruncated,
      r = new Ctor(1),

      // Max n of 9007199254740991 takes 53 loop iterations.
      // Maximum digits array length; leaves [28, 34] guard digits.
      k = Math.ceil(pr / LOG_BASE + 4);

    external = false;

    for (;;) {
      if (n % 2) {
        r = r.times(x);
        if (truncate(r.d, k)) isTruncated = true;
      }

      n = mathfloor(n / 2);
      if (n === 0) {

        // To ensure correct rounding when r.d is truncated, increment the last word if it is zero.
        n = r.d.length - 1;
        if (isTruncated && r.d[n] === 0) ++r.d[n];
        break;
      }

      x = x.times(x);
      truncate(x.d, k);
    }

    external = true;

    return r;
  }


  function isOdd(n) {
    return n.d[n.d.length - 1] & 1;
  }


  /*
   * Handle `max` and `min`. `ltgt` is 'lt' or 'gt'.
   */
  function maxOrMin(Ctor, args, ltgt) {
    var y,
      x = new Ctor(args[0]),
      i = 0;

    for (; ++i < args.length;) {
      y = new Ctor(args[i]);
      if (!y.s) {
        x = y;
        break;
      } else if (x[ltgt](y)) {
        x = y;
      }
    }

    return x;
  }


  /*
   * Return a new Decimal whose value is the natural exponential of `x` rounded to `sd` significant
   * digits.
   *
   * Taylor/Maclaurin series.
   *
   * exp(x) = x^0/0! + x^1/1! + x^2/2! + x^3/3! + ...
   *
   * Argument reduction:
   *   Repeat x = x / 32, k += 5, until |x| < 0.1
   *   exp(x) = exp(x / 2^k)^(2^k)
   *
   * Previously, the argument was initially reduced by
   * exp(x) = exp(r) * 10^k  where r = x - k * ln10, k = floor(x / ln10)
   * to first put r in the range [0, ln10], before dividing by 32 until |x| < 0.1, but this was
   * found to be slower than just dividing repeatedly by 32 as above.
   *
   * Max integer argument: exp('20723265836946413') = 6.3e+9000000000000000
   * Min integer argument: exp('-20723265836946411') = 1.2e-9000000000000000
   * (Math object integer min/max: Math.exp(709) = 8.2e+307, Math.exp(-745) = 5e-324)
   *
   *  exp(Infinity)  = Infinity
   *  exp(-Infinity) = 0
   *  exp(NaN)       = NaN
   *  exp(±0)        = 1
   *
   *  exp(x) is non-terminating for any finite, non-zero x.
   *
   *  The result will always be correctly rounded.
   *
   */
  function naturalExponential(x, sd) {
    var denominator, guard, j, pow, sum, t, wpr,
      rep = 0,
      i = 0,
      k = 0,
      Ctor = x.constructor,
      rm = Ctor.rounding,
      pr = Ctor.precision;

    // 0/NaN/Infinity?
    if (!x.d || !x.d[0] || x.e > 17) {

      return new Ctor(x.d
        ? !x.d[0] ? 1 : x.s < 0 ? 0 : 1 / 0
        : x.s ? x.s < 0 ? 0 : x : 0 / 0);
    }

    if (sd == null) {
      external = false;
      wpr = pr;
    } else {
      wpr = sd;
    }

    t = new Ctor(0.03125);

    // while abs(x) >= 0.1
    while (x.e > -2) {

      // x = x / 2^5
      x = x.times(t);
      k += 5;
    }

    // Use 2 * log10(2^k) + 5 (empirically derived) to estimate the increase in precision
    // necessary to ensure the first 4 rounding digits are correct.
    guard = Math.log(mathpow(2, k)) / Math.LN10 * 2 + 5 | 0;
    wpr += guard;
    denominator = pow = sum = new Ctor(1);
    Ctor.precision = wpr;

    for (;;) {
      pow = finalise(pow.times(x), wpr, 1);
      denominator = denominator.times(++i);
      t = sum.plus(divide(pow, denominator, wpr, 1));

      if (digitsToString(t.d).slice(0, wpr) === digitsToString(sum.d).slice(0, wpr)) {
        j = k;
        while (j--) sum = finalise(sum.times(sum), wpr, 1);

        // Check to see if the first 4 rounding digits are [49]999.
        // If so, repeat the summation with a higher precision, otherwise
        // e.g. with precision: 18, rounding: 1
        // exp(18.404272462595034083567793919843761) = 98372560.1229999999 (should be 98372560.123)
        // `wpr - guard` is the index of first rounding digit.
        if (sd == null) {

          if (rep < 3 && checkRoundingDigits(sum.d, wpr - guard, rm, rep)) {
            Ctor.precision = wpr += 10;
            denominator = pow = t = new Ctor(1);
            i = 0;
            rep++;
          } else {
            return finalise(sum, Ctor.precision = pr, rm, external = true);
          }
        } else {
          Ctor.precision = pr;
          return sum;
        }
      }

      sum = t;
    }
  }


  /*
   * Return a new Decimal whose value is the natural logarithm of `x` rounded to `sd` significant
   * digits.
   *
   *  ln(-n)        = NaN
   *  ln(0)         = -Infinity
   *  ln(-0)        = -Infinity
   *  ln(1)         = 0
   *  ln(Infinity)  = Infinity
   *  ln(-Infinity) = NaN
   *  ln(NaN)       = NaN
   *
   *  ln(n) (n != 1) is non-terminating.
   *
   */
  function naturalLogarithm(y, sd) {
    var c, c0, denominator, e, numerator, rep, sum, t, wpr, x1, x2,
      n = 1,
      guard = 10,
      x = y,
      xd = x.d,
      Ctor = x.constructor,
      rm = Ctor.rounding,
      pr = Ctor.precision;

    // Is x negative or Infinity, NaN, 0 or 1?
    if (x.s < 0 || !xd || !xd[0] || !x.e && xd[0] == 1 && xd.length == 1) {
      return new Ctor(xd && !xd[0] ? -1 / 0 : x.s != 1 ? NaN : xd ? 0 : x);
    }

    if (sd == null) {
      external = false;
      wpr = pr;
    } else {
      wpr = sd;
    }

    Ctor.precision = wpr += guard;
    c = digitsToString(xd);
    c0 = c.charAt(0);

    if (Math.abs(e = x.e) < 1.5e15) {

      // Argument reduction.
      // The series converges faster the closer the argument is to 1, so using
      // ln(a^b) = b * ln(a),   ln(a) = ln(a^b) / b
      // multiply the argument by itself until the leading digits of the significand are 7, 8, 9,
      // 10, 11, 12 or 13, recording the number of multiplications so the sum of the series can
      // later be divided by this number, then separate out the power of 10 using
      // ln(a*10^b) = ln(a) + b*ln(10).

      // max n is 21 (gives 0.9, 1.0 or 1.1) (9e15 / 21 = 4.2e14).
      //while (c0 < 9 && c0 != 1 || c0 == 1 && c.charAt(1) > 1) {
      // max n is 6 (gives 0.7 - 1.3)
      while (c0 < 7 && c0 != 1 || c0 == 1 && c.charAt(1) > 3) {
        x = x.times(y);
        c = digitsToString(x.d);
        c0 = c.charAt(0);
        n++;
      }

      e = x.e;

      if (c0 > 1) {
        x = new Ctor('0.' + c);
        e++;
      } else {
        x = new Ctor(c0 + '.' + c.slice(1));
      }
    } else {

      // The argument reduction method above may result in overflow if the argument y is a massive
      // number with exponent >= 1500000000000000 (9e15 / 6 = 1.5e15), so instead recall this
      // function using ln(x*10^e) = ln(x) + e*ln(10).
      t = getLn10(Ctor, wpr + 2, pr).times(e + '');
      x = naturalLogarithm(new Ctor(c0 + '.' + c.slice(1)), wpr - guard).plus(t);
      Ctor.precision = pr;

      return sd == null ? finalise(x, pr, rm, external = true) : x;
    }

    // x1 is x reduced to a value near 1.
    x1 = x;

    // Taylor series.
    // ln(y) = ln((1 + x)/(1 - x)) = 2(x + x^3/3 + x^5/5 + x^7/7 + ...)
    // where x = (y - 1)/(y + 1)    (|x| < 1)
    sum = numerator = x = divide(x.minus(1), x.plus(1), wpr, 1);
    x2 = finalise(x.times(x), wpr, 1);
    denominator = 3;

    for (;;) {
      numerator = finalise(numerator.times(x2), wpr, 1);
      t = sum.plus(divide(numerator, new Ctor(denominator), wpr, 1));

      if (digitsToString(t.d).slice(0, wpr) === digitsToString(sum.d).slice(0, wpr)) {
        sum = sum.times(2);

        // Reverse the argument reduction. Check that e is not 0 because, besides preventing an
        // unnecessary calculation, -0 + 0 = +0 and to ensure correct rounding -0 needs to stay -0.
        if (e !== 0) sum = sum.plus(getLn10(Ctor, wpr + 2, pr).times(e + ''));
        sum = divide(sum, new Ctor(n), wpr, 1);

        // Is rm > 3 and the first 4 rounding digits 4999, or rm < 4 (or the summation has
        // been repeated previously) and the first 4 rounding digits 9999?
        // If so, restart the summation with a higher precision, otherwise
        // e.g. with precision: 12, rounding: 1
        // ln(135520028.6126091714265381533) = 18.7246299999 when it should be 18.72463.
        // `wpr - guard` is the index of first rounding digit.
        if (sd == null) {
          if (checkRoundingDigits(sum.d, wpr - guard, rm, rep)) {
            Ctor.precision = wpr += guard;
            t = numerator = x = divide(x1.minus(1), x1.plus(1), wpr, 1);
            x2 = finalise(x.times(x), wpr, 1);
            denominator = rep = 1;
          } else {
            return finalise(sum, Ctor.precision = pr, rm, external = true);
          }
        } else {
          Ctor.precision = pr;
          return sum;
        }
      }

      sum = t;
      denominator += 2;
    }
  }


  // ±Infinity, NaN.
  function nonFiniteToString(x) {
    // Unsigned.
    return String(x.s * x.s / 0);
  }


  /*
   * Parse the value of a new Decimal `x` from string `str`.
   */
  function parseDecimal(x, str) {
    var e, i, len;

    // Decimal point?
    if ((e = str.indexOf('.')) > -1) str = str.replace('.', '');

    // Exponential form?
    if ((i = str.search(/e/i)) > 0) {

      // Determine exponent.
      if (e < 0) e = i;
      e += +str.slice(i + 1);
      str = str.substring(0, i);
    } else if (e < 0) {

      // Integer.
      e = str.length;
    }

    // Determine leading zeros.
    for (i = 0; str.charCodeAt(i) === 48; i++);

    // Determine trailing zeros.
    for (len = str.length; str.charCodeAt(len - 1) === 48; --len);
    str = str.slice(i, len);

    if (str) {
      len -= i;
      x.e = e = e - i - 1;
      x.d = [];

      // Transform base

      // e is the base 10 exponent.
      // i is where to slice str to get the first word of the digits array.
      i = (e + 1) % LOG_BASE;
      if (e < 0) i += LOG_BASE;

      if (i < len) {
        if (i) x.d.push(+str.slice(0, i));
        for (len -= LOG_BASE; i < len;) x.d.push(+str.slice(i, i += LOG_BASE));
        str = str.slice(i);
        i = LOG_BASE - str.length;
      } else {
        i -= len;
      }

      for (; i--;) str += '0';
      x.d.push(+str);

      if (external) {

        // Overflow?
        if (x.e > x.constructor.maxE) {

          // Infinity.
          x.d = null;
          x.e = NaN;

        // Underflow?
        } else if (x.e < x.constructor.minE) {

          // Zero.
          x.e = 0;
          x.d = [0];
          // x.constructor.underflow = true;
        } // else x.constructor.underflow = false;
      }
    } else {

      // Zero.
      x.e = 0;
      x.d = [0];
    }

    return x;
  }


  /*
   * Parse the value of a new Decimal `x` from a string `str`, which is not a decimal value.
   */
  function parseOther(x, str) {
    var base, Ctor, divisor, i, isFloat, len, p, xd, xe;

    if (str === 'Infinity' || str === 'NaN') {
      if (!+str) x.s = NaN;
      x.e = NaN;
      x.d = null;
      return x;
    }

    if (isHex.test(str))  {
      base = 16;
      str = str.toLowerCase();
    } else if (isBinary.test(str))  {
      base = 2;
    } else if (isOctal.test(str))  {
      base = 8;
    } else {
      throw Error(invalidArgument + str);
    }

    // Is there a binary exponent part?
    i = str.search(/p/i);

    if (i > 0) {
      p = +str.slice(i + 1);
      str = str.substring(2, i);
    } else {
      str = str.slice(2);
    }

    // Convert `str` as an integer then divide the result by `base` raised to a power such that the
    // fraction part will be restored.
    i = str.indexOf('.');
    isFloat = i >= 0;
    Ctor = x.constructor;

    if (isFloat) {
      str = str.replace('.', '');
      len = str.length;
      i = len - i;

      // log[10](16) = 1.2041... , log[10](88) = 1.9444....
      divisor = intPow(Ctor, new Ctor(base), i, i * 2);
    }

    xd = convertBase(str, base, BASE);
    xe = xd.length - 1;

    // Remove trailing zeros.
    for (i = xe; xd[i] === 0; --i) xd.pop();
    if (i < 0) return new Ctor(x.s * 0);
    x.e = getBase10Exponent(xd, xe);
    x.d = xd;
    external = false;

    // At what precision to perform the division to ensure exact conversion?
    // maxDecimalIntegerPartDigitCount = ceil(log[10](b) * otherBaseIntegerPartDigitCount)
    // log[10](2) = 0.30103, log[10](8) = 0.90309, log[10](16) = 1.20412
    // E.g. ceil(1.2 * 3) = 4, so up to 4 decimal digits are needed to represent 3 hex int digits.
    // maxDecimalFractionPartDigitCount = {Hex:4|Oct:3|Bin:1} * otherBaseFractionPartDigitCount
    // Therefore using 4 * the number of digits of str will always be enough.
    if (isFloat) x = divide(x, divisor, len * 4);

    // Multiply by the binary exponent part if present.
    if (p) x = x.times(Math.abs(p) < 54 ? mathpow(2, p) : Decimal.pow(2, p));
    external = true;

    return x;
  }


  /*
   * sin(x) = x - x^3/3! + x^5/5! - ...
   * |x| < pi/2
   *
   */
  function sine(Ctor, x) {
    var k,
      len = x.d.length;

    if (len < 3) return taylorSeries(Ctor, 2, x, x);

    // Argument reduction: sin(5x) = 16*sin^5(x) - 20*sin^3(x) + 5*sin(x)
    // i.e. sin(x) = 16*sin^5(x/5) - 20*sin^3(x/5) + 5*sin(x/5)
    // and  sin(x) = sin(x/5)(5 + sin^2(x/5)(16sin^2(x/5) - 20))

    // Estimate the optimum number of times to use the argument reduction.
    k = 1.4 * Math.sqrt(len);
    k = k > 16 ? 16 : k | 0;

    x = x.times(1 / tinyPow(5, k));
    x = taylorSeries(Ctor, 2, x, x);

    // Reverse argument reduction
    var sin2_x,
      d5 = new Ctor(5),
      d16 = new Ctor(16),
      d20 = new Ctor(20);
    for (; k--;) {
      sin2_x = x.times(x);
      x = x.times(d5.plus(sin2_x.times(d16.times(sin2_x).minus(d20))));
    }

    return x;
  }


  // Calculate Taylor series for `cos`, `cosh`, `sin` and `sinh`.
  function taylorSeries(Ctor, n, x, y, isHyperbolic) {
    var j, t, u, x2,
      i = 1,
      pr = Ctor.precision,
      k = Math.ceil(pr / LOG_BASE);

    external = false;
    x2 = x.times(x);
    u = new Ctor(y);

    for (;;) {
      t = divide(u.times(x2), new Ctor(n++ * n++), pr, 1);
      u = isHyperbolic ? y.plus(t) : y.minus(t);
      y = divide(t.times(x2), new Ctor(n++ * n++), pr, 1);
      t = u.plus(y);

      if (t.d[k] !== void 0) {
        for (j = k; t.d[j] === u.d[j] && j--;);
        if (j == -1) break;
      }

      j = u;
      u = y;
      y = t;
      t = j;
      i++;
    }

    external = true;
    t.d.length = k + 1;

    return t;
  }


  // Exponent e must be positive and non-zero.
  function tinyPow(b, e) {
    var n = b;
    while (--e) n *= b;
    return n;
  }


  // Return the absolute value of `x` reduced to less than or equal to half pi.
  function toLessThanHalfPi(Ctor, x) {
    var t,
      isNeg = x.s < 0,
      pi = getPi(Ctor, Ctor.precision, 1),
      halfPi = pi.times(0.5);

    x = x.abs();

    if (x.lte(halfPi)) {
      quadrant = isNeg ? 4 : 1;
      return x;
    }

    t = x.divToInt(pi);

    if (t.isZero()) {
      quadrant = isNeg ? 3 : 2;
    } else {
      x = x.minus(t.times(pi));

      // 0 <= x < pi
      if (x.lte(halfPi)) {
        quadrant = isOdd(t) ? (isNeg ? 2 : 3) : (isNeg ? 4 : 1);
        return x;
      }

      quadrant = isOdd(t) ? (isNeg ? 1 : 4) : (isNeg ? 3 : 2);
    }

    return x.minus(pi).abs();
  }


  /*
   * Return the value of Decimal `x` as a string in base `baseOut`.
   *
   * If the optional `sd` argument is present include a binary exponent suffix.
   */
  function toStringBinary(x, baseOut, sd, rm) {
    var base, e, i, k, len, roundUp, str, xd, y,
      Ctor = x.constructor,
      isExp = sd !== void 0;

    if (isExp) {
      checkInt32(sd, 1, MAX_DIGITS);
      if (rm === void 0) rm = Ctor.rounding;
      else checkInt32(rm, 0, 8);
    } else {
      sd = Ctor.precision;
      rm = Ctor.rounding;
    }

    if (!x.isFinite()) {
      str = nonFiniteToString(x);
    } else {
      str = finiteToString(x);
      i = str.indexOf('.');

      // Use exponential notation according to `toExpPos` and `toExpNeg`? No, but if required:
      // maxBinaryExponent = floor((decimalExponent + 1) * log[2](10))
      // minBinaryExponent = floor(decimalExponent * log[2](10))
      // log[2](10) = 3.321928094887362347870319429489390175864

      if (isExp) {
        base = 2;
        if (baseOut == 16) {
          sd = sd * 4 - 3;
        } else if (baseOut == 8) {
          sd = sd * 3 - 2;
        }
      } else {
        base = baseOut;
      }

      // Convert the number as an integer then divide the result by its base raised to a power such
      // that the fraction part will be restored.

      // Non-integer.
      if (i >= 0) {
        str = str.replace('.', '');
        y = new Ctor(1);
        y.e = str.length - i;
        y.d = convertBase(finiteToString(y), 10, base);
        y.e = y.d.length;
      }

      xd = convertBase(str, 10, base);
      e = len = xd.length;

      // Remove trailing zeros.
      for (; xd[--len] == 0;) xd.pop();

      if (!xd[0]) {
        str = isExp ? '0p+0' : '0';
      } else {
        if (i < 0) {
          e--;
        } else {
          x = new Ctor(x);
          x.d = xd;
          x.e = e;
          x = divide(x, y, sd, rm, 0, base);
          xd = x.d;
          e = x.e;
          roundUp = inexact;
        }

        // The rounding digit, i.e. the digit after the digit that may be rounded up.
        i = xd[sd];
        k = base / 2;
        roundUp = roundUp || xd[sd + 1] !== void 0;

        roundUp = rm < 4
          ? (i !== void 0 || roundUp) && (rm === 0 || rm === (x.s < 0 ? 3 : 2))
          : i > k || i === k && (rm === 4 || roundUp || rm === 6 && xd[sd - 1] & 1 ||
            rm === (x.s < 0 ? 8 : 7));

        xd.length = sd;

        if (roundUp) {

          // Rounding up may mean the previous digit has to be rounded up and so on.
          for (; ++xd[--sd] > base - 1;) {
            xd[sd] = 0;
            if (!sd) {
              ++e;
              xd.unshift(1);
            }
          }
        }

        // Determine trailing zeros.
        for (len = xd.length; !xd[len - 1]; --len);

        // E.g. [4, 11, 15] becomes 4bf.
        for (i = 0, str = ''; i < len; i++) str += NUMERALS.charAt(xd[i]);

        // Add binary exponent suffix?
        if (isExp) {
          if (len > 1) {
            if (baseOut == 16 || baseOut == 8) {
              i = baseOut == 16 ? 4 : 3;
              for (--len; len % i; len++) str += '0';
              xd = convertBase(str, base, baseOut);
              for (len = xd.length; !xd[len - 1]; --len);

              // xd[0] will always be be 1
              for (i = 1, str = '1.'; i < len; i++) str += NUMERALS.charAt(xd[i]);
            } else {
              str = str.charAt(0) + '.' + str.slice(1);
            }
          }

          str =  str + (e < 0 ? 'p' : 'p+') + e;
        } else if (e < 0) {
          for (; ++e;) str = '0' + str;
          str = '0.' + str;
        } else {
          if (++e > len) for (e -= len; e-- ;) str += '0';
          else if (e < len) str = str.slice(0, e) + '.' + str.slice(e);
        }
      }

      str = (baseOut == 16 ? '0x' : baseOut == 2 ? '0b' : baseOut == 8 ? '0o' : '') + str;
    }

    return x.s < 0 ? '-' + str : str;
  }


  // Does not strip trailing zeros.
  function truncate(arr, len) {
    if (arr.length > len) {
      arr.length = len;
      return true;
    }
  }


  // Decimal methods


  /*
   *  abs
   *  acos
   *  acosh
   *  add
   *  asin
   *  asinh
   *  atan
   *  atanh
   *  atan2
   *  cbrt
   *  ceil
   *  clone
   *  config
   *  cos
   *  cosh
   *  div
   *  exp
   *  floor
   *  hypot
   *  ln
   *  log
   *  log2
   *  log10
   *  max
   *  min
   *  mod
   *  mul
   *  pow
   *  random
   *  round
   *  set
   *  sign
   *  sin
   *  sinh
   *  sqrt
   *  sub
   *  tan
   *  tanh
   *  trunc
   */


  /*
   * Return a new Decimal whose value is the absolute value of `x`.
   *
   * x {number|string|Decimal}
   *
   */
  function abs(x) {
    return new this(x).abs();
  }


  /*
   * Return a new Decimal whose value is the arccosine in radians of `x`.
   *
   * x {number|string|Decimal}
   *
   */
  function acos(x) {
    return new this(x).acos();
  }


  /*
   * Return a new Decimal whose value is the inverse of the hyperbolic cosine of `x`, rounded to
   * `precision` significant digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal} A value in radians.
   *
   */
  function acosh(x) {
    return new this(x).acosh();
  }


  /*
   * Return a new Decimal whose value is the sum of `x` and `y`, rounded to `precision` significant
   * digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal}
   * y {number|string|Decimal}
   *
   */
  function add(x, y) {
    return new this(x).plus(y);
  }


  /*
   * Return a new Decimal whose value is the arcsine in radians of `x`, rounded to `precision`
   * significant digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal}
   *
   */
  function asin(x) {
    return new this(x).asin();
  }


  /*
   * Return a new Decimal whose value is the inverse of the hyperbolic sine of `x`, rounded to
   * `precision` significant digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal} A value in radians.
   *
   */
  function asinh(x) {
    return new this(x).asinh();
  }


  /*
   * Return a new Decimal whose value is the arctangent in radians of `x`, rounded to `precision`
   * significant digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal}
   *
   */
  function atan(x) {
    return new this(x).atan();
  }


  /*
   * Return a new Decimal whose value is the inverse of the hyperbolic tangent of `x`, rounded to
   * `precision` significant digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal} A value in radians.
   *
   */
  function atanh(x) {
    return new this(x).atanh();
  }


  /*
   * Return a new Decimal whose value is the arctangent in radians of `y/x` in the range -pi to pi
   * (inclusive), rounded to `precision` significant digits using rounding mode `rounding`.
   *
   * Domain: [-Infinity, Infinity]
   * Range: [-pi, pi]
   *
   * y {number|string|Decimal} The y-coordinate.
   * x {number|string|Decimal} The x-coordinate.
   *
   * atan2(±0, -0)               = ±pi
   * atan2(±0, +0)               = ±0
   * atan2(±0, -x)               = ±pi for x > 0
   * atan2(±0, x)                = ±0 for x > 0
   * atan2(-y, ±0)               = -pi/2 for y > 0
   * atan2(y, ±0)                = pi/2 for y > 0
   * atan2(±y, -Infinity)        = ±pi for finite y > 0
   * atan2(±y, +Infinity)        = ±0 for finite y > 0
   * atan2(±Infinity, x)         = ±pi/2 for finite x
   * atan2(±Infinity, -Infinity) = ±3*pi/4
   * atan2(±Infinity, +Infinity) = ±pi/4
   * atan2(NaN, x) = NaN
   * atan2(y, NaN) = NaN
   *
   */
  function atan2(y, x) {
    y = new this(y);
    x = new this(x);
    var r,
      pr = this.precision,
      rm = this.rounding,
      wpr = pr + 4;

    // Either NaN
    if (!y.s || !x.s) {
      r = new this(NaN);

    // Both ±Infinity
    } else if (!y.d && !x.d) {
      r = getPi(this, wpr, 1).times(x.s > 0 ? 0.25 : 0.75);
      r.s = y.s;

    // x is ±Infinity or y is ±0
    } else if (!x.d || y.isZero()) {
      r = x.s < 0 ? getPi(this, pr, rm) : new this(0);
      r.s = y.s;

    // y is ±Infinity or x is ±0
    } else if (!y.d || x.isZero()) {
      r = getPi(this, wpr, 1).times(0.5);
      r.s = y.s;

    // Both non-zero and finite
    } else if (x.s < 0) {
      this.precision = wpr;
      this.rounding = 1;
      r = this.atan(divide(y, x, wpr, 1));
      x = getPi(this, wpr, 1);
      this.precision = pr;
      this.rounding = rm;
      r = y.s < 0 ? r.minus(x) : r.plus(x);
    } else {
      r = this.atan(divide(y, x, wpr, 1));
    }

    return r;
  }


  /*
   * Return a new Decimal whose value is the cube root of `x`, rounded to `precision` significant
   * digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal}
   *
   */
  function cbrt(x) {
    return new this(x).cbrt();
  }


  /*
   * Return a new Decimal whose value is `x` rounded to an integer using `ROUND_CEIL`.
   *
   * x {number|string|Decimal}
   *
   */
  function ceil(x) {
    return finalise(x = new this(x), x.e + 1, 2);
  }


  /*
   * Configure global settings for a Decimal constructor.
   *
   * `obj` is an object with one or more of the following properties,
   *
   *   precision  {number}
   *   rounding   {number}
   *   toExpNeg   {number}
   *   toExpPos   {number}
   *   maxE       {number}
   *   minE       {number}
   *   modulo     {number}
   *   crypto     {boolean|number}
   *   defaults   {true}
   *
   * E.g. Decimal.config({ precision: 20, rounding: 4 })
   *
   */
  function config(obj) {
    if (!obj || typeof obj !== 'object') throw Error(decimalError + 'Object expected');
    var i, p, v,
      useDefaults = obj.defaults === true,
      ps = [
        'precision', 1, MAX_DIGITS,
        'rounding', 0, 8,
        'toExpNeg', -EXP_LIMIT, 0,
        'toExpPos', 0, EXP_LIMIT,
        'maxE', 0, EXP_LIMIT,
        'minE', -EXP_LIMIT, 0,
        'modulo', 0, 9
      ];

    for (i = 0; i < ps.length; i += 3) {
      if (p = ps[i], useDefaults) this[p] = DEFAULTS[p];
      if ((v = obj[p]) !== void 0) {
        if (mathfloor(v) === v && v >= ps[i + 1] && v <= ps[i + 2]) this[p] = v;
        else throw Error(invalidArgument + p + ': ' + v);
      }
    }

    if (p = 'crypto', useDefaults) this[p] = DEFAULTS[p];
    if ((v = obj[p]) !== void 0) {
      if (v === true || v === false || v === 0 || v === 1) {
        if (v) {
          if (typeof crypto != 'undefined' && crypto &&
            (crypto.getRandomValues || crypto.randomBytes)) {
            this[p] = true;
          } else {
            throw Error(cryptoUnavailable);
          }
        } else {
          this[p] = false;
        }
      } else {
        throw Error(invalidArgument + p + ': ' + v);
      }
    }

    return this;
  }


  /*
   * Return a new Decimal whose value is the cosine of `x`, rounded to `precision` significant
   * digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal} A value in radians.
   *
   */
  function cos(x) {
    return new this(x).cos();
  }


  /*
   * Return a new Decimal whose value is the hyperbolic cosine of `x`, rounded to precision
   * significant digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal} A value in radians.
   *
   */
  function cosh(x) {
    return new this(x).cosh();
  }


  /*
   * Create and return a Decimal constructor with the same configuration properties as this Decimal
   * constructor.
   *
   */
  function clone(obj) {
    var i, p, ps;

    /*
     * The Decimal constructor and exported function.
     * Return a new Decimal instance.
     *
     * v {number|string|Decimal} A numeric value.
     *
     */
    function Decimal(v) {
      var e, i, t,
        x = this;

      // Decimal called without new.
      if (!(x instanceof Decimal)) return new Decimal(v);

      // Retain a reference to this Decimal constructor, and shadow Decimal.prototype.constructor
      // which points to Object.
      x.constructor = Decimal;

      // Duplicate.
      if (v instanceof Decimal) {
        x.s = v.s;

        if (external) {
          if (!v.d || v.e > Decimal.maxE) {

            // Infinity.
            x.e = NaN;
            x.d = null;
          } else if (v.e < Decimal.minE) {

            // Zero.
            x.e = 0;
            x.d = [0];
          } else {
            x.e = v.e;
            x.d = v.d.slice();
          }
        } else {
          x.e = v.e;
          x.d = v.d ? v.d.slice() : v.d;
        }

        return;
      }

      t = typeof v;

      if (t === 'number') {
        if (v === 0) {
          x.s = 1 / v < 0 ? -1 : 1;
          x.e = 0;
          x.d = [0];
          return;
        }

        if (v < 0) {
          v = -v;
          x.s = -1;
        } else {
          x.s = 1;
        }

        // Fast path for small integers.
        if (v === ~~v && v < 1e7) {
          for (e = 0, i = v; i >= 10; i /= 10) e++;

          if (external) {
            if (e > Decimal.maxE) {
              x.e = NaN;
              x.d = null;
            } else if (e < Decimal.minE) {
              x.e = 0;
              x.d = [0];
            } else {
              x.e = e;
              x.d = [v];
            }
          } else {
            x.e = e;
            x.d = [v];
          }

          return;

        // Infinity, NaN.
        } else if (v * 0 !== 0) {
          if (!v) x.s = NaN;
          x.e = NaN;
          x.d = null;
          return;
        }

        return parseDecimal(x, v.toString());

      } else if (t !== 'string') {
        throw Error(invalidArgument + v);
      }

      // Minus sign?
      if ((i = v.charCodeAt(0)) === 45) {
        v = v.slice(1);
        x.s = -1;
      } else {
        // Plus sign?
        if (i === 43) v = v.slice(1);
        x.s = 1;
      }

      return isDecimal.test(v) ? parseDecimal(x, v) : parseOther(x, v);
    }

    Decimal.prototype = P;

    Decimal.ROUND_UP = 0;
    Decimal.ROUND_DOWN = 1;
    Decimal.ROUND_CEIL = 2;
    Decimal.ROUND_FLOOR = 3;
    Decimal.ROUND_HALF_UP = 4;
    Decimal.ROUND_HALF_DOWN = 5;
    Decimal.ROUND_HALF_EVEN = 6;
    Decimal.ROUND_HALF_CEIL = 7;
    Decimal.ROUND_HALF_FLOOR = 8;
    Decimal.EUCLID = 9;

    Decimal.config = Decimal.set = config;
    Decimal.clone = clone;
    Decimal.isDecimal = isDecimalInstance;

    Decimal.abs = abs;
    Decimal.acos = acos;
    Decimal.acosh = acosh;        // ES6
    Decimal.add = add;
    Decimal.asin = asin;
    Decimal.asinh = asinh;        // ES6
    Decimal.atan = atan;
    Decimal.atanh = atanh;        // ES6
    Decimal.atan2 = atan2;
    Decimal.cbrt = cbrt;          // ES6
    Decimal.ceil = ceil;
    Decimal.cos = cos;
    Decimal.cosh = cosh;          // ES6
    Decimal.div = div;
    Decimal.exp = exp;
    Decimal.floor = floor;
    Decimal.hypot = hypot;        // ES6
    Decimal.ln = ln;
    Decimal.log = log;
    Decimal.log10 = log10;        // ES6
    Decimal.log2 = log2;          // ES6
    Decimal.max = max;
    Decimal.min = min;
    Decimal.mod = mod;
    Decimal.mul = mul;
    Decimal.pow = pow;
    Decimal.random = random;
    Decimal.round = round;
    Decimal.sign = sign;          // ES6
    Decimal.sin = sin;
    Decimal.sinh = sinh;          // ES6
    Decimal.sqrt = sqrt;
    Decimal.sub = sub;
    Decimal.tan = tan;
    Decimal.tanh = tanh;          // ES6
    Decimal.trunc = trunc;        // ES6

    if (obj === void 0) obj = {};
    if (obj) {
      if (obj.defaults !== true) {
        ps = ['precision', 'rounding', 'toExpNeg', 'toExpPos', 'maxE', 'minE', 'modulo', 'crypto'];
        for (i = 0; i < ps.length;) if (!obj.hasOwnProperty(p = ps[i++])) obj[p] = this[p];
      }
    }

    Decimal.config(obj);

    return Decimal;
  }


  /*
   * Return a new Decimal whose value is `x` divided by `y`, rounded to `precision` significant
   * digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal}
   * y {number|string|Decimal}
   *
   */
  function div(x, y) {
    return new this(x).div(y);
  }


  /*
   * Return a new Decimal whose value is the natural exponential of `x`, rounded to `precision`
   * significant digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal} The power to which to raise the base of the natural log.
   *
   */
  function exp(x) {
    return new this(x).exp();
  }


  /*
   * Return a new Decimal whose value is `x` round to an integer using `ROUND_FLOOR`.
   *
   * x {number|string|Decimal}
   *
   */
  function floor(x) {
    return finalise(x = new this(x), x.e + 1, 3);
  }


  /*
   * Return a new Decimal whose value is the square root of the sum of the squares of the arguments,
   * rounded to `precision` significant digits using rounding mode `rounding`.
   *
   * hypot(a, b, ...) = sqrt(a^2 + b^2 + ...)
   *
   * arguments {number|string|Decimal}
   *
   */
  function hypot() {
    var i, n,
      t = new this(0);

    external = false;

    for (i = 0; i < arguments.length;) {
      n = new this(arguments[i++]);
      if (!n.d) {
        if (n.s) {
          external = true;
          return new this(1 / 0);
        }
        t = n;
      } else if (t.d) {
        t = t.plus(n.times(n));
      }
    }

    external = true;

    return t.sqrt();
  }


  /*
   * Return true if object is a Decimal instance (where Decimal is any Decimal constructor),
   * otherwise return false.
   *
   */
  function isDecimalInstance(obj) {
    return obj instanceof Decimal || obj && obj.name === '[object Decimal]' || false;
  }


  /*
   * Return a new Decimal whose value is the natural logarithm of `x`, rounded to `precision`
   * significant digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal}
   *
   */
  function ln(x) {
    return new this(x).ln();
  }


  /*
   * Return a new Decimal whose value is the log of `x` to the base `y`, or to base 10 if no base
   * is specified, rounded to `precision` significant digits using rounding mode `rounding`.
   *
   * log[y](x)
   *
   * x {number|string|Decimal} The argument of the logarithm.
   * y {number|string|Decimal} The base of the logarithm.
   *
   */
  function log(x, y) {
    return new this(x).log(y);
  }


  /*
   * Return a new Decimal whose value is the base 2 logarithm of `x`, rounded to `precision`
   * significant digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal}
   *
   */
  function log2(x) {
    return new this(x).log(2);
  }


  /*
   * Return a new Decimal whose value is the base 10 logarithm of `x`, rounded to `precision`
   * significant digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal}
   *
   */
  function log10(x) {
    return new this(x).log(10);
  }


  /*
   * Return a new Decimal whose value is the maximum of the arguments.
   *
   * arguments {number|string|Decimal}
   *
   */
  function max() {
    return maxOrMin(this, arguments, 'lt');
  }


  /*
   * Return a new Decimal whose value is the minimum of the arguments.
   *
   * arguments {number|string|Decimal}
   *
   */
  function min() {
    return maxOrMin(this, arguments, 'gt');
  }


  /*
   * Return a new Decimal whose value is `x` modulo `y`, rounded to `precision` significant digits
   * using rounding mode `rounding`.
   *
   * x {number|string|Decimal}
   * y {number|string|Decimal}
   *
   */
  function mod(x, y) {
    return new this(x).mod(y);
  }


  /*
   * Return a new Decimal whose value is `x` multiplied by `y`, rounded to `precision` significant
   * digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal}
   * y {number|string|Decimal}
   *
   */
  function mul(x, y) {
    return new this(x).mul(y);
  }


  /*
   * Return a new Decimal whose value is `x` raised to the power `y`, rounded to precision
   * significant digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal} The base.
   * y {number|string|Decimal} The exponent.
   *
   */
  function pow(x, y) {
    return new this(x).pow(y);
  }


  /*
   * Returns a new Decimal with a random value equal to or greater than 0 and less than 1, and with
   * `sd`, or `Decimal.precision` if `sd` is omitted, significant digits (or less if trailing zeros
   * are produced).
   *
   * [sd] {number} Significant digits. Integer, 0 to MAX_DIGITS inclusive.
   *
   */
  function random(sd) {
    var d, e, k, n,
      i = 0,
      r = new this(1),
      rd = [];

    if (sd === void 0) sd = this.precision;
    else checkInt32(sd, 1, MAX_DIGITS);

    k = Math.ceil(sd / LOG_BASE);

    if (!this.crypto) {
      for (; i < k;) rd[i++] = Math.random() * 1e7 | 0;

    // Browsers supporting crypto.getRandomValues.
    } else if (crypto.getRandomValues) {
      d = crypto.getRandomValues(new Uint32Array(k));

      for (; i < k;) {
        n = d[i];

        // 0 <= n < 4294967296
        // Probability n >= 4.29e9, is 4967296 / 4294967296 = 0.00116 (1 in 865).
        if (n >= 4.29e9) {
          d[i] = crypto.getRandomValues(new Uint32Array(1))[0];
        } else {

          // 0 <= n <= 4289999999
          // 0 <= (n % 1e7) <= 9999999
          rd[i++] = n % 1e7;
        }
      }

    // Node.js supporting crypto.randomBytes.
    } else if (crypto.randomBytes) {

      // buffer
      d = crypto.randomBytes(k *= 4);

      for (; i < k;) {

        // 0 <= n < 2147483648
        n = d[i] + (d[i + 1] << 8) + (d[i + 2] << 16) + ((d[i + 3] & 0x7f) << 24);

        // Probability n >= 2.14e9, is 7483648 / 2147483648 = 0.0035 (1 in 286).
        if (n >= 2.14e9) {
          crypto.randomBytes(4).copy(d, i);
        } else {

          // 0 <= n <= 2139999999
          // 0 <= (n % 1e7) <= 9999999
          rd.push(n % 1e7);
          i += 4;
        }
      }

      i = k / 4;
    } else {
      throw Error(cryptoUnavailable);
    }

    k = rd[--i];
    sd %= LOG_BASE;

    // Convert trailing digits to zeros according to sd.
    if (k && sd) {
      n = mathpow(10, LOG_BASE - sd);
      rd[i] = (k / n | 0) * n;
    }

    // Remove trailing words which are zero.
    for (; rd[i] === 0; i--) rd.pop();

    // Zero?
    if (i < 0) {
      e = 0;
      rd = [0];
    } else {
      e = -1;

      // Remove leading words which are zero and adjust exponent accordingly.
      for (; rd[0] === 0; e -= LOG_BASE) rd.shift();

      // Count the digits of the first word of rd to determine leading zeros.
      for (k = 1, n = rd[0]; n >= 10; n /= 10) k++;

      // Adjust the exponent for leading zeros of the first word of rd.
      if (k < LOG_BASE) e -= LOG_BASE - k;
    }

    r.e = e;
    r.d = rd;

    return r;
  }


  /*
   * Return a new Decimal whose value is `x` rounded to an integer using rounding mode `rounding`.
   *
   * To emulate `Math.round`, set rounding to 7 (ROUND_HALF_CEIL).
   *
   * x {number|string|Decimal}
   *
   */
  function round(x) {
    return finalise(x = new this(x), x.e + 1, this.rounding);
  }


  /*
   * Return
   *   1    if x > 0,
   *  -1    if x < 0,
   *   0    if x is 0,
   *  -0    if x is -0,
   *   NaN  otherwise
   *
   * x {number|string|Decimal}
   *
   */
  function sign(x) {
    x = new this(x);
    return x.d ? (x.d[0] ? x.s : 0 * x.s) : x.s || NaN;
  }


  /*
   * Return a new Decimal whose value is the sine of `x`, rounded to `precision` significant digits
   * using rounding mode `rounding`.
   *
   * x {number|string|Decimal} A value in radians.
   *
   */
  function sin(x) {
    return new this(x).sin();
  }


  /*
   * Return a new Decimal whose value is the hyperbolic sine of `x`, rounded to `precision`
   * significant digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal} A value in radians.
   *
   */
  function sinh(x) {
    return new this(x).sinh();
  }


  /*
   * Return a new Decimal whose value is the square root of `x`, rounded to `precision` significant
   * digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal}
   *
   */
  function sqrt(x) {
    return new this(x).sqrt();
  }


  /*
   * Return a new Decimal whose value is `x` minus `y`, rounded to `precision` significant digits
   * using rounding mode `rounding`.
   *
   * x {number|string|Decimal}
   * y {number|string|Decimal}
   *
   */
  function sub(x, y) {
    return new this(x).sub(y);
  }


  /*
   * Return a new Decimal whose value is the tangent of `x`, rounded to `precision` significant
   * digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal} A value in radians.
   *
   */
  function tan(x) {
    return new this(x).tan();
  }


  /*
   * Return a new Decimal whose value is the hyperbolic tangent of `x`, rounded to `precision`
   * significant digits using rounding mode `rounding`.
   *
   * x {number|string|Decimal} A value in radians.
   *
   */
  function tanh(x) {
    return new this(x).tanh();
  }


  /*
   * Return a new Decimal whose value is `x` truncated to an integer.
   *
   * x {number|string|Decimal}
   *
   */
  function trunc(x) {
    return finalise(x = new this(x), x.e + 1, 1);
  }


  // Create and configure initial Decimal constructor.
  Decimal = clone(DEFAULTS);

  Decimal['default'] = Decimal.Decimal = Decimal;

  // Create the internal constants from their string values.
  LN10 = new Decimal(LN10);
  PI = new Decimal(PI);


  // Export.


  // AMD.
  if (true) {
    !(__WEBPACK_AMD_DEFINE_RESULT__ = (function () {
      return Decimal;
    }).call(exports, __webpack_require__, exports, module),
				__WEBPACK_AMD_DEFINE_RESULT__ !== undefined && (module.exports = __WEBPACK_AMD_DEFINE_RESULT__));

  // Node and other environments that support module.exports.
  } else {}
})(this);


/***/ }),

/***/ "./node_modules/line-i18n/dist/LanguageService.js":
/*!********************************************************!*\
  !*** ./node_modules/line-i18n/dist/LanguageService.js ***!
  \********************************************************/
/*! exports provided: LanguageService */
/***/ (function(module, __webpack_exports__, __webpack_require__) {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "LanguageService", function() { return LanguageService; });
var LanguageService = /** @class */ (function () {
    function LanguageService(lsKey, defaultLang) {
        if (defaultLang === void 0) { defaultLang = 'pt'; }
        this.lsKey = lsKey;
        this.defaultLang = defaultLang;
        this.listeners = [];
        this.document = document;
        this.setupListener();
    }
    LanguageService.prototype.setupListener = function () {
        var _this = this;
        if (this.document !== null) {
            this.document.addEventListener("storage", (function (event) {
                var e = event;
                if (e.key === _this.lsKey) {
                    _this.listeners.forEach(function (l) { return l(); });
                }
            }));
        }
    };
    LanguageService.prototype.getLang = function () {
        var lang = localStorage.getItem(this.lsKey);
        if (lang === null || lang === undefined) {
            console.warn("Internal Error: User language information has not been set. Returning default...");
            return this.getDefaultLang();
        }
        return lang;
    };
    LanguageService.prototype.getDefaultLang = function () {
        return this.defaultLang;
    };
    LanguageService.prototype.registerLanguageChangeListener = function (listener) {
        this.listeners.push(listener);
    };
    return LanguageService;
}());



/***/ }),

/***/ "./node_modules/line-i18n/dist/LanguageServiceNoLS.js":
/*!************************************************************!*\
  !*** ./node_modules/line-i18n/dist/LanguageServiceNoLS.js ***!
  \************************************************************/
/*! exports provided: LanguageServiceNoLS */
/***/ (function(module, __webpack_exports__, __webpack_require__) {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "LanguageServiceNoLS", function() { return LanguageServiceNoLS; });
var LanguageServiceNoLS = /** @class */ (function () {
    function LanguageServiceNoLS(lang) {
        this.lang = lang;
        this.listeners = [];
    }
    LanguageServiceNoLS.prototype.setupListener = function () { };
    LanguageServiceNoLS.prototype.notifyChange = function () {
        this.listeners.forEach(function (l) { return l(); });
    };
    LanguageServiceNoLS.prototype.setLang = function (lang) {
        this.lang = lang;
        this.notifyChange();
    };
    LanguageServiceNoLS.prototype.getLang = function () {
        return this.lang;
    };
    LanguageServiceNoLS.prototype.getDefaultLang = function () {
        return this.lang;
    };
    LanguageServiceNoLS.prototype.registerLanguageChangeListener = function (listener) {
        this.listeners.push(listener);
    };
    return LanguageServiceNoLS;
}());



/***/ }),

/***/ "./node_modules/line-i18n/dist/LocalizedStrings.js":
/*!*********************************************************!*\
  !*** ./node_modules/line-i18n/dist/LocalizedStrings.js ***!
  \*********************************************************/
/*! exports provided: LocalizedStrings */
/***/ (function(module, __webpack_exports__, __webpack_require__) {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "LocalizedStrings", function() { return LocalizedStrings; });
/* harmony import */ var _StringTypes__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(/*! ./StringTypes */ "./node_modules/line-i18n/dist/StringTypes.js");

var LocalizedStrings = /** @class */ (function () {
    function LocalizedStrings(service, i18nData, listenToChange) {
        var _this = this;
        if (listenToChange === void 0) { listenToChange = false; }
        this.service = service;
        this.i18nData = i18nData;
        this.listenToChange = listenToChange;
        this.document = document;
        if (this.listenToChange) {
            service.registerLanguageChangeListener(function () {
                _this.updateTagText();
            });
        }
    }
    LocalizedStrings.prototype.getString = function (id, type) {
        var i18nObj = this.i18nData[this.service.getLang()];
        if (!i18nObj) {
            console.warn("Internal Error. The language set at ivprog.lang is not valid: " + this.service.getLang());
            return this.getDefaultString(id, type);
        }
        if (!i18nObj[type]) {
            return this.getDefaultString(id, type);
        }
        else if (!i18nObj[type][id]) {
            return this.getDefaultString(id, type);
        }
        else {
            return i18nObj[type][id];
        }
    };
    LocalizedStrings.prototype.getDefaultString = function (id, type) {
        var i18nObj = this.i18nData[this.service.getDefaultLang()];
        if (!i18nObj[type]) {
            return "{MISSING_I18N_TYPE_IDENTIFIER: " + type + "}";
        }
        else if (!i18nObj[type][id]) {
            return "{MISSING_I18N_IDENTIFIER: " + id + "}";
        }
        else {
            return i18nObj[type][id];
        }
    };
    LocalizedStrings.prototype.getOR = function () {
        return this.getUI("string_join_or");
    };
    LocalizedStrings.prototype.getError = function (id, context) {
        if (context === void 0) { context = []; }
        var text = this.getString(id, _StringTypes__WEBPACK_IMPORTED_MODULE_0__["StringTypes"].ERROR);
        return this.processString(text, context);
    };
    LocalizedStrings.prototype.getMessage = function (id, context) {
        if (context === void 0) { context = []; }
        var text = this.getString(id, _StringTypes__WEBPACK_IMPORTED_MODULE_0__["StringTypes"].MESSAGE);
        return this.processString(text, context);
    };
    LocalizedStrings.prototype.getUI = function (id, context) {
        if (context === void 0) { context = []; }
        var text = this.getString(id, _StringTypes__WEBPACK_IMPORTED_MODULE_0__["StringTypes"].UI);
        return this.processString(text, context);
    };
    LocalizedStrings.prototype.processString = function (text, context) {
        for (var i = 0; i < context.length; i++) {
            var v = context[i];
            text = text.replace("$" + i, v);
        }
        return text;
    };
    LocalizedStrings.prototype.updateTagText = function (func) {
        var _this = this;
        if (func === void 0) { func = null; }
        if (this.document !== null) {
            var list = this.document.querySelectorAll("data.i18n");
            list.forEach(function (node) {
                if (func === null) {
                    node.innerHTML = _this.processTagTex(node.getAttribute("value"));
                }
                else {
                    node.innerHTML = func(node.getAttribute("value"));
                }
            });
        }
    };
    LocalizedStrings.prototype.processTagTex = function (text) {
        if (text === null) {
            return "<Invalid i18n identifier>";
        }
        var opts = text.split(":");
        var type = opts[0].toLowerCase();
        var id = opts[1];
        if (_StringTypes__WEBPACK_IMPORTED_MODULE_0__["StringTypes"].ERROR === type) {
            return this.getError(id);
        }
        else if (_StringTypes__WEBPACK_IMPORTED_MODULE_0__["StringTypes"].MESSAGE === type) {
            return this.getMessage(id);
        }
        else if (_StringTypes__WEBPACK_IMPORTED_MODULE_0__["StringTypes"].UI === type) {
            return this.getUI(id);
        }
        else {
            console.warn(" A string has been passed to the i18n helper function that was not in the form type:id -> " +
                text);
            return this.getString(id, type);
        }
    };
    return LocalizedStrings;
}());



/***/ }),

/***/ "./node_modules/line-i18n/dist/StringTypes.js":
/*!****************************************************!*\
  !*** ./node_modules/line-i18n/dist/StringTypes.js ***!
  \****************************************************/
/*! exports provided: StringTypes */
/***/ (function(module, __webpack_exports__, __webpack_require__) {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "StringTypes", function() { return StringTypes; });
var StringTypes;
(function (StringTypes) {
    StringTypes["ERROR"] = "error";
    StringTypes["MESSAGE"] = "message";
    StringTypes["UI"] = "ui";
})(StringTypes || (StringTypes = {}));


/***/ }),

/***/ "./node_modules/line-i18n/dist/index.js":
/*!**********************************************!*\
  !*** ./node_modules/line-i18n/dist/index.js ***!
  \**********************************************/
/*! exports provided: default */
/***/ (function(module, __webpack_exports__, __webpack_require__) {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony import */ var _LanguageService__WEBPACK_IMPORTED_MODULE_0__ = __webpack_require__(/*! ./LanguageService */ "./node_modules/line-i18n/dist/LanguageService.js");
/* harmony import */ var _LocalizedStrings__WEBPACK_IMPORTED_MODULE_1__ = __webpack_require__(/*! ./LocalizedStrings */ "./node_modules/line-i18n/dist/LocalizedStrings.js");
/* harmony import */ var _StringTypes__WEBPACK_IMPORTED_MODULE_2__ = __webpack_require__(/*! ./StringTypes */ "./node_modules/line-i18n/dist/StringTypes.js");
/* harmony import */ var _LanguageServiceNoLS__WEBPACK_IMPORTED_MODULE_3__ = __webpack_require__(/*! ./LanguageServiceNoLS */ "./node_modules/line-i18n/dist/LanguageServiceNoLS.js");




/* harmony default export */ __webpack_exports__["default"] = ({
    LanguageService: _LanguageService__WEBPACK_IMPORTED_MODULE_0__["LanguageService"],
    LanguageServiceNoLS: _LanguageServiceNoLS__WEBPACK_IMPORTED_MODULE_3__["LanguageServiceNoLS"],
    LocalizedStrings: _LocalizedStrings__WEBPACK_IMPORTED_MODULE_1__["LocalizedStrings"],
    StringTypes: _StringTypes__WEBPACK_IMPORTED_MODULE_2__["StringTypes"]
});


/***/ }),

/***/ "./node_modules/melanke-watchjs/src/watch.js":
/*!***************************************************!*\
  !*** ./node_modules/melanke-watchjs/src/watch.js ***!
  \***************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

"use strict";
/**
 * DEVELOPED BY
 * GIL LOPES BUENO
 * gilbueno.mail@gmail.com
 *
 * WORKS WITH:
 * IE8*, IE 9+, FF 4+, SF 5+, WebKit, CH 7+, OP 12+, BESEN, Rhino 1.7+
 * For IE8 (and other legacy browsers) WatchJS will use dirty checking  
 *
 * FORK:
 * https://github.com/melanke/Watch.JS
 *
 * LICENSE: MIT
 */


(function (factory) {
    if (true) {
        // Node. Does not work with strict CommonJS, but
        // only CommonJS-like enviroments that support module.exports,
        // like Node.
        module.exports = factory();
    } else {}
}(function () {

    var WatchJS = {
        noMore: false,        // use WatchJS.suspend(obj) instead
        useDirtyCheck: false, // use only dirty checking to track changes.
        preserveExistingSetters: false
    },
    lengthsubjects = [];
    
    var dirtyChecklist = [];
    var pendingChanges = []; // used coalesce changes from defineProperty and __defineSetter__
    
    var supportDefineProperty = false;
    try {
        supportDefineProperty = Object.defineProperty && Object.defineProperty({},'x', {});
    } catch(ex) {  /* not supported */  }

    var isFunction = function (functionToCheck) {
        var getType = {};
        return functionToCheck && getType.toString.call(functionToCheck) == '[object Function]';
    };

    var isInt = function (x) {
        return x % 1 === 0;
    };

    var isArray = function(obj) {
        return Object.prototype.toString.call(obj) === '[object Array]';
    };

    var isObject = function(obj) {
        return {}.toString.apply(obj) === '[object Object]';
    };
    
    var getObjDiff = function(a, b){
        var aplus = [],
        bplus = [];

        if(!(typeof a == "string") && !(typeof b == "string")){

            if (isArray(a) && b) {
                for (var i=0; i<a.length; i++) {
                    if (b[i] === undefined) aplus.push(i);
                }
            } else {
                for(var i in a){
                    if (a.hasOwnProperty(i)) {
                        if(b && !b.hasOwnProperty(i)) {
                            aplus.push(i);
                        }
                    }
                }
            }

            if (isArray(b) && a) {
                for (var j=0; j<b.length; j++) {
                    if (a[j] === undefined) bplus.push(j);
                }
            } else {
                for(var j in b){
                    if (b.hasOwnProperty(j)) {
                        if(a && !a.hasOwnProperty(j)) {
                            bplus.push(j);
                        }
                    }
                }
            }
        }

        return {
            added: aplus,
            removed: bplus
        }
    };

    var clone = function(obj){

        if (null == obj || "object" != typeof obj) {
            return obj;
        }

        var copy = obj.constructor();

        for (var attr in obj) {
            copy[attr] = obj[attr];
        }

        return copy;        

    }

    var getExistingSetter = function (obj, propName) {
        if (WatchJS.preserveExistingSetters) {
            var existing = Object.getOwnPropertyDescriptor(obj, propName);
            return existing.set;
        }

        return undefined;
    }

    var defineGetAndSet = function (obj, propName, getter, setter) {
        try {
            var existingSetter = getExistingSetter(obj, propName);
            Object.defineProperty(obj, propName, {
                get: getter,
                set: function(value) {
                    setter.call(this, value, true); // coalesce changes
                    if (existingSetter) {
                        existingSetter(value);
                    }
                },
                enumerable: true,
                configurable: true
            });
        }
        catch(e1) {
            try{
                Object.prototype.__defineGetter__.call(obj, propName, getter);
                Object.prototype.__defineSetter__.call(obj, propName, function(value) {
                    setter.call(this,value,true); // coalesce changes
                });
            }
            catch(e2) {
                observeDirtyChanges(obj,propName,setter);
                //throw new Error("watchJS error: browser not supported :/")
            }
        }

    };

    var defineProp = function (obj, propName, value) {
        try {
            Object.defineProperty(obj, propName, {
                enumerable: false,
                configurable: true,
                writable: false,
                value: value
            });
        } catch(error) {
            obj[propName] = value;
        }
    };

    var observeDirtyChanges = function(obj,propName,setter) {
        dirtyChecklist[dirtyChecklist.length] = {
            prop:       propName,
            object:     obj,
            orig:       clone(obj[propName]),
            callback:   setter
        }        
    }
    
    var watch = function () {

        if (isFunction(arguments[1])) {
            watchAll.apply(this, arguments);
        } else if (isArray(arguments[1])) {
            watchMany.apply(this, arguments);
        } else {
            watchOne.apply(this, arguments);
        }

    };


    var watchAll = function (obj, watcher, level, addNRemove) {

        if ((typeof obj == "string") || (!(obj instanceof Object) && !isArray(obj))) { //accepts only objects and array (not string)
            return;
        }

        if(isArray(obj)) {
            defineWatcher(obj, "__watchall__", watcher, level); // watch all changes on the array
            if (level===undefined||level > 0) {
                for (var prop = 0; prop < obj.length; prop++) { // watch objects in array
                   watchAll(obj[prop],watcher,level, addNRemove);
                }
            }
        } 
        else {
            var prop,props = [];
            for (prop in obj) { //for each attribute if obj is an object
                if (prop == "$val" || (!supportDefineProperty && prop === 'watchers')) {
                    continue;
                }

                if (Object.prototype.hasOwnProperty.call(obj, prop)) {
                    props.push(prop); //put in the props
                }
            }
            watchMany(obj, props, watcher, level, addNRemove); //watch all items of the props
        }


        if (addNRemove) {
            pushToLengthSubjects(obj, "$$watchlengthsubjectroot", watcher, level);
        }
    };


    var watchMany = function (obj, props, watcher, level, addNRemove) {

        if ((typeof obj == "string") || (!(obj instanceof Object) && !isArray(obj))) { //accepts only objects and array (not string)
            return;
        }

        for (var i=0; i<props.length; i++) { //watch each property
            var prop = props[i];
            watchOne(obj, prop, watcher, level, addNRemove);
        }

    };

    var watchOne = function (obj, prop, watcher, level, addNRemove) {
        if ((typeof obj == "string") || (!(obj instanceof Object) && !isArray(obj))) { //accepts only objects and array (not string)
            return;
        }

        if(isFunction(obj[prop])) { //dont watch if it is a function
            return;
        }
        if(obj[prop] != null && (level === undefined || level > 0)){
            watchAll(obj[prop], watcher, level!==undefined? level-1 : level); //recursively watch all attributes of this
        }

        defineWatcher(obj, prop, watcher, level);

        if(addNRemove && (level === undefined || level > 0)){
            pushToLengthSubjects(obj, prop, watcher, level);
        }

    };

    var unwatch = function () {

        if (isFunction(arguments[1])) {
            unwatchAll.apply(this, arguments);
        } else if (isArray(arguments[1])) {
            unwatchMany.apply(this, arguments);
        } else {
            unwatchOne.apply(this, arguments);
        }

    };

    var unwatchAll = function (obj, watcher) {

        if (obj instanceof String || (!(obj instanceof Object) && !isArray(obj))) { //accepts only objects and array (not string)
            return;
        }

        if (isArray(obj)) {
            var props = ['__watchall__'];
            for (var prop = 0; prop < obj.length; prop++) { //for each item if obj is an array
                props.push(prop); //put in the props
            }
            unwatchMany(obj, props, watcher); //watch all itens of the props
        } else {
            var unwatchPropsInObject = function (obj2) {
                var props = [];
                for (var prop2 in obj2) { //for each attribute if obj is an object
                    if (obj2.hasOwnProperty(prop2)) {
                        if (obj2[prop2] instanceof Object) {
                            unwatchPropsInObject(obj2[prop2]); //recurs into object props
                        } else {
                            props.push(prop2); //put in the props
                        }
                    }
                }
                unwatchMany(obj2, props, watcher); //unwatch all of the props
            };
            unwatchPropsInObject(obj);
        }
    };


    var unwatchMany = function (obj, props, watcher) {

        for (var prop2 in props) { //watch each attribute of "props" if is an object
            if (props.hasOwnProperty(prop2)) {
                unwatchOne(obj, props[prop2], watcher);
            }
        }
    };

    var timeouts = [],
        timerID = null;
    function clearTimerID() {
        timerID = null;
        for(var i=0; i< timeouts.length; i++) {
            timeouts[i]();
        }
        timeouts.length = 0;
    }
    var getTimerID= function () {
        if (!timerID)  {
            timerID = setTimeout(clearTimerID);
        }
        return timerID;
    }
    var registerTimeout = function(fn) { // register function to be called on timeout
        if (timerID==null) getTimerID();
        timeouts[timeouts.length] = fn;
    }
    
    // Track changes made to an array, object or an object's property 
    // and invoke callback with a single change object containing type, value, oldvalue and array splices
    // Syntax: 
    //      trackChange(obj, callback, recursive, addNRemove)
    //      trackChange(obj, prop, callback, recursive, addNRemove)
    var trackChange = function() {
        var fn = (isFunction(arguments[2])) ? trackProperty : trackObject ;
        fn.apply(this,arguments);
    }

    // track changes made to an object and invoke callback with a single change object containing type, value and array splices
    var trackObject= function(obj, callback, recursive, addNRemove) {
        var change = null,lastTimerID = -1;
        var isArr = isArray(obj);
        var level,fn = function(prop, action, newValue, oldValue) {
            var timerID = getTimerID();
            if (lastTimerID!==timerID) { // check if timer has changed since last update
                lastTimerID = timerID;
                change = {
                    type: 'update'
                }
                change['value'] = obj;
                change['splices'] = null;
                registerTimeout(function() {
                    callback.call(this,change);
                    change = null;
                });
            }
            // create splices for array changes
            if (isArr && obj === this && change !== null)  {                
                if (action==='pop'||action==='shift') {
                    newValue = [];
                    oldValue = [oldValue];
                }
                else if (action==='push'||action==='unshift') {
                    newValue = [newValue];
                    oldValue = [];
                }
                else if (action!=='splice') { 
                    return; // return here - for reverse and sort operations we don't need to return splices. a simple update will do
                }
                if (!change.splices) change.splices = [];
                change.splices[change.splices.length] = {
                    index: prop,
                    deleteCount: oldValue ? oldValue.length : 0,
                    addedCount: newValue ? newValue.length : 0,
                    added: newValue,
                    deleted: oldValue
                };
            }

        }  
        level = (recursive==true) ? undefined : 0;        
        watchAll(obj,fn, level, addNRemove);
    }
    
    // track changes made to the property of an object and invoke callback with a single change object containing type, value, oldvalue and splices
    var trackProperty = function(obj,prop,callback,recursive, addNRemove) { 
        if (obj && prop) {
            watchOne(obj,prop,function(prop, action, newvalue, oldvalue) {
                var change = {
                    type: 'update'
                }
                change['value'] = newvalue;
                change['oldvalue'] = oldvalue;
                if (recursive && isObject(newvalue)||isArray(newvalue)) {
                    trackObject(newvalue,callback,recursive, addNRemove);
                }               
                callback.call(this,change);
            },0)
            
            if (recursive && isObject(obj[prop])||isArray(obj[prop])) {
                trackObject(obj[prop],callback,recursive, addNRemove);
            }                           
        }
    }
    
    
    var defineWatcher = function (obj, prop, watcher, level) {
        var newWatcher = false;
        var isArr = isArray(obj);
        
        if (!obj.watchers) {
            defineProp(obj, "watchers", {});
            if (isArr) {
                // watch array functions
                watchFunctions(obj, function(index,action,newValue, oldValue) {
                    addPendingChange(obj, index, action,newValue, oldValue);
                    if (level !== 0 && newValue && (isObject(newValue) || isArray(newValue))) {
                        var i,n, ln, wAll, watchList = obj.watchers[prop];
                        if ((wAll = obj.watchers['__watchall__'])) {
                            watchList = watchList ? watchList.concat(wAll) : wAll;
                        }
                        ln = watchList ?  watchList.length : 0;
                        for (i = 0; i<ln; i++) {
                            if (action!=='splice') {
                                watchAll(newValue, watchList[i], (level===undefined)?level:level-1);
                            }
                            else {
                                // watch spliced values
                                for(n=0; n < newValue.length; n++) {
                                    watchAll(newValue[n], watchList[i], (level===undefined)?level:level-1);
                                }
                            }
                        }
                    }
                });
            }
        }

        if (!obj.watchers[prop]) {
            obj.watchers[prop] = [];
            if (!isArr) newWatcher = true;
        }

        for (var i=0; i<obj.watchers[prop].length; i++) {
            if(obj.watchers[prop][i] === watcher){
                return;
            }
        }

        obj.watchers[prop].push(watcher); //add the new watcher to the watchers array

        if (newWatcher) {
            var val = obj[prop];            
            var getter = function () {
                return val;                        
            };

            var setter = function (newval, delayWatcher) {
                var oldval = val;
                val = newval;                
                if (level !== 0 
                    && obj[prop] && (isObject(obj[prop]) || isArray(obj[prop]))
                    && !obj[prop].watchers) {
                    // watch sub properties
                    var i,ln = obj.watchers[prop].length; 
                    for(i=0; i<ln; i++) {
                        watchAll(obj[prop], obj.watchers[prop][i], (level===undefined)?level:level-1);
                    }
                }

                //watchFunctions(obj, prop);
                
                if (isSuspended(obj, prop)) {
                    resume(obj, prop);
                    return;
                }

                if (!WatchJS.noMore){ // this does not work with Object.observe
                    //if (JSON.stringify(oldval) !== JSON.stringify(newval)) {
                    if (obj[prop] instanceof Date && oldval && newval) {
                        oldval = oldval.valueOf();
                        newval = newval.valueOf();
                    }	
                    if (oldval !== newval) {
                        if (!delayWatcher) {
                            callWatchers(obj, prop, "set", newval, oldval);
                        }
                        else {
                            addPendingChange(obj, prop, "set", newval, oldval);
                        }
                        WatchJS.noMore = false;
                    }
                }
            };

            if (WatchJS.useDirtyCheck) {
                observeDirtyChanges(obj,prop,setter);
            }
            else {
                defineGetAndSet(obj, prop, getter, setter);
            }
        }

    };

    var callWatchers = function (obj, prop, action, newval, oldval) {
        if (prop !== undefined) {
            var ln, wl, watchList = obj.watchers[prop];
            if ((wl = obj.watchers['__watchall__'])) {
                watchList = watchList ? watchList.concat(wl) : wl;
            }
            ln = watchList ? watchList.length : 0;
            for (var wr=0; wr< ln; wr++) {
                watchList[wr].call(obj, prop, action, newval, oldval);
            }
        } else {
            for (var prop in obj) {//call all
                if (obj.hasOwnProperty(prop)) {
                    callWatchers(obj, prop, action, newval, oldval);
                }
            }
        }
    };

    var methodNames = ['pop', 'push', 'reverse', 'shift', 'sort', 'slice', 'unshift', 'splice'];
    var defineArrayMethodWatcher = function (obj, original, methodName, callback) {
        defineProp(obj, methodName, function () {
            var index = 0;
            var i,newValue, oldValue, response;                        
            // get values before splicing array 
            if (methodName === 'splice') {
               var start = arguments[0];
               var end = start + arguments[1];
               oldValue = obj.slice(start,end);
               newValue = [];
               for(i=2;i<arguments.length;i++) {
                   newValue[i-2] = arguments[i];
               }
               index = start;
            } 
            else {
                newValue = arguments.length > 0 ? arguments[0] : undefined;
            } 

            response = original.apply(obj, arguments);
            if (methodName !== 'slice') {
                if (methodName === 'pop') {
                    oldValue = response;
                    index = obj.length;
                }
                else if (methodName === 'push') {
                    index = obj.length-1;
                }
                else if (methodName === 'shift') {
                    oldValue = response;
                }
                else if (methodName !== 'unshift' && newValue===undefined) {
                    newValue = response;
                }
                callback.call(obj, index, methodName,newValue, oldValue)
            }
            return response;
        });
    };

    var watchFunctions = function(obj, callback) {

        if (!isFunction(callback) || !obj || (obj instanceof String) || (!isArray(obj))) {
            return;
        }

        for (var i = methodNames.length, methodName; i--;) {
            methodName = methodNames[i];
            defineArrayMethodWatcher(obj, obj[methodName], methodName, callback);
        }

    };

    var unwatchOne = function (obj, prop, watcher) {
        if (prop) {
            if (obj.watchers && obj.watchers[prop]) {
                if (watcher === undefined) {
                    delete obj.watchers[prop]; // remove all property watchers
                }
                else {
                    for (var i = 0; i < obj.watchers[prop].length; i++) {
                        var w = obj.watchers[prop][i];
                        if (w == watcher) {
                            obj.watchers[prop].splice(i, 1);
                        }
                    }
                }
            }
        } else {
            delete obj.watchers;
        }

        removeFromLengthSubjects(obj, prop, watcher);
        removeFromDirtyChecklist(obj, prop);
    };
    
    // suspend watchers until next update cycle
    var suspend = function(obj, prop) {
        if (obj.watchers) {
            var name = '__wjs_suspend__'+(prop!==undefined ? prop : '');
            obj.watchers[name] = true;
        }
    }
    
    var isSuspended = function(obj, prop) {
        return obj.watchers 
               && (obj.watchers['__wjs_suspend__'] || 
                   obj.watchers['__wjs_suspend__'+prop]);
    }
    
    // resumes preivously suspended watchers
    var resume = function(obj, prop) {
        registerTimeout(function() {
            delete obj.watchers['__wjs_suspend__'];
            delete obj.watchers['__wjs_suspend__'+prop];
        })
    }

    var pendingTimerID = null;
    var addPendingChange = function(obj,prop, mode, newval, oldval) {
        pendingChanges[pendingChanges.length] = {
            obj:obj,
            prop: prop,
            mode: mode,
            newval: newval,
            oldval: oldval
        };
        if (pendingTimerID===null) {
            pendingTimerID = setTimeout(applyPendingChanges);
        }
    };
    
    
    var applyPendingChanges = function()  {
        // apply pending changes
        var change = null;
        pendingTimerID = null;
        for(var i=0;i < pendingChanges.length;i++) {
            change = pendingChanges[i];
            callWatchers(change.obj, change.prop, change.mode, change.newval, change.oldval);
        }
        if (change) {
            pendingChanges = [];
            change = null;
        }        
    }

    var loop = function(){

        // check for new or deleted props
        for(var i=0; i<lengthsubjects.length; i++) {

            var subj = lengthsubjects[i];

            if (subj.prop === "$$watchlengthsubjectroot") {

                var difference = getObjDiff(subj.obj, subj.actual);

                if(difference.added.length || difference.removed.length){
                    if(difference.added.length){
                        watchMany(subj.obj, difference.added, subj.watcher, subj.level - 1, true);
                    }

                    subj.watcher.call(subj.obj, "root", "differentattr", difference, subj.actual);
                }
                subj.actual = clone(subj.obj);


            } else {

                var difference = getObjDiff(subj.obj[subj.prop], subj.actual);

                if(difference.added.length || difference.removed.length){
                    if(difference.added.length){
                        for (var j=0; j<subj.obj.watchers[subj.prop].length; j++) {
                            watchMany(subj.obj[subj.prop], difference.added, subj.obj.watchers[subj.prop][j], subj.level - 1, true);
                        }
                    }

                    callWatchers(subj.obj, subj.prop, "differentattr", difference, subj.actual);
                }

                subj.actual = clone(subj.obj[subj.prop]);

            }

        }
        
        // start dirty check
        var n, value;
        if (dirtyChecklist.length > 0) {
            for (var i = 0; i < dirtyChecklist.length; i++) {
                n = dirtyChecklist[i];
                value = n.object[n.prop];
                if (!compareValues(n.orig, value)) {
                    n.orig = clone(value);
                    n.callback(value);
                }
            }
        }

    };

    var compareValues =  function(a,b) {
        var i, state = true;
        if (a!==b)  {
            if (isObject(a)) {
                for(i in a) {
                    if (!supportDefineProperty && i==='watchers') continue;
                    if (a[i]!==b[i]) {
                        state = false;
                        break;
                    };
                }
            }
            else {
                state = false;
            }
        }
        return state;
    }
    
    var pushToLengthSubjects = function(obj, prop, watcher, level){

        var actual;

        if (prop === "$$watchlengthsubjectroot") {
            actual =  clone(obj);
        } else {
            actual = clone(obj[prop]);
        }

        lengthsubjects.push({
            obj: obj,
            prop: prop,
            actual: actual,
            watcher: watcher,
            level: level
        });
    };

    var removeFromLengthSubjects = function(obj, prop, watcher){
        for (var i=0; i<lengthsubjects.length; i++) {
            var subj = lengthsubjects[i];

            if (subj.obj == obj) {
                if (!prop || subj.prop == prop) {
                    if (!watcher || subj.watcher == watcher) {
                        // if we splice off one item at position i
                        // we need to decrement i as the array is one item shorter
                        // so when we increment i in the loop statement we
                        // will land at the correct index.
                        // if it's not decremented, you won't delete all length subjects
                        lengthsubjects.splice(i--, 1);
                    }
                }
            }
        }

    };
    
    var removeFromDirtyChecklist = function(obj, prop){
        var notInUse;
        for (var i=0; i<dirtyChecklist.length; i++) {
            var n = dirtyChecklist[i];
            var watchers = n.object.watchers;
            notInUse = (
                n.object == obj 
                && (!prop || n.prop == prop)
                && watchers
                && (!prop || !watchers[prop] || watchers[prop].length == 0 )
            );
            if (notInUse)  {
                // we use the same syntax as in removeFromLengthSubjects
                dirtyChecklist.splice(i--, 1);
            }
        }

    };    

    setInterval(loop, 50);

    WatchJS.watch = watch;
    WatchJS.unwatch = unwatch;
    WatchJS.callWatchers = callWatchers;
    WatchJS.suspend = suspend; // suspend watchers    
    WatchJS.onChange = trackChange;  // track changes made to object or  it's property and return a single change object

    return WatchJS;

}));


/***/ }),

/***/ "./node_modules/node-libs-browser/mock/empty.js":
/*!******************************************************!*\
  !*** ./node_modules/node-libs-browser/mock/empty.js ***!
  \******************************************************/
/*! no static exports found */
/***/ (function(module, exports) {



/***/ }),

/***/ "./node_modules/regenerator-runtime/runtime.js":
/*!*****************************************************!*\
  !*** ./node_modules/regenerator-runtime/runtime.js ***!
  \*****************************************************/
/*! no static exports found */
/***/ (function(module, exports, __webpack_require__) {

/**
 * Copyright (c) 2014-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

var runtime = (function (exports) {
  "use strict";

  var Op = Object.prototype;
  var hasOwn = Op.hasOwnProperty;
  var undefined; // More compressible than void 0.
  var $Symbol = typeof Symbol === "function" ? Symbol : {};
  var iteratorSymbol = $Symbol.iterator || "@@iterator";
  var asyncIteratorSymbol = $Symbol.asyncIterator || "@@asyncIterator";
  var toStringTagSymbol = $Symbol.toStringTag || "@@toStringTag";

  function wrap(innerFn, outerFn, self, tryLocsList) {
    // If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator.
    var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator;
    var generator = Object.create(protoGenerator.prototype);
    var context = new Context(tryLocsList || []);

    // The ._invoke method unifies the implementations of the .next,
    // .throw, and .return methods.
    generator._invoke = makeInvokeMethod(innerFn, self, context);

    return generator;
  }
  exports.wrap = wrap;

  // Try/catch helper to minimize deoptimizations. Returns a completion
  // record like context.tryEntries[i].completion. This interface could
  // have been (and was previously) designed to take a closure to be
  // invoked without arguments, but in all the cases we care about we
  // already have an existing method we want to call, so there's no need
  // to create a new function object. We can even get away with assuming
  // the method takes exactly one argument, since that happens to be true
  // in every case, so we don't have to touch the arguments object. The
  // only additional allocation required is the completion record, which
  // has a stable shape and so hopefully should be cheap to allocate.
  function tryCatch(fn, obj, arg) {
    try {
      return { type: "normal", arg: fn.call(obj, arg) };
    } catch (err) {
      return { type: "throw", arg: err };
    }
  }

  var GenStateSuspendedStart = "suspendedStart";
  var GenStateSuspendedYield = "suspendedYield";
  var GenStateExecuting = "executing";
  var GenStateCompleted = "completed";

  // Returning this object from the innerFn has the same effect as
  // breaking out of the dispatch switch statement.
  var ContinueSentinel = {};

  // Dummy constructor functions that we use as the .constructor and
  // .constructor.prototype properties for functions that return Generator
  // objects. For full spec compliance, you may wish to configure your
  // minifier not to mangle the names of these two functions.
  function Generator() {}
  function GeneratorFunction() {}
  function GeneratorFunctionPrototype() {}

  // This is a polyfill for %IteratorPrototype% for environments that
  // don't natively support it.
  var IteratorPrototype = {};
  IteratorPrototype[iteratorSymbol] = function () {
    return this;
  };

  var getProto = Object.getPrototypeOf;
  var NativeIteratorPrototype = getProto && getProto(getProto(values([])));
  if (NativeIteratorPrototype &&
      NativeIteratorPrototype !== Op &&
      hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) {
    // This environment has a native %IteratorPrototype%; use it instead
    // of the polyfill.
    IteratorPrototype = NativeIteratorPrototype;
  }

  var Gp = GeneratorFunctionPrototype.prototype =
    Generator.prototype = Object.create(IteratorPrototype);
  GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype;
  GeneratorFunctionPrototype.constructor = GeneratorFunction;
  GeneratorFunctionPrototype[toStringTagSymbol] =
    GeneratorFunction.displayName = "GeneratorFunction";

  // Helper for defining the .next, .throw, and .return methods of the
  // Iterator interface in terms of a single ._invoke method.
  function defineIteratorMethods(prototype) {
    ["next", "throw", "return"].forEach(function(method) {
      prototype[method] = function(arg) {
        return this._invoke(method, arg);
      };
    });
  }

  exports.isGeneratorFunction = function(genFun) {
    var ctor = typeof genFun === "function" && genFun.constructor;
    return ctor
      ? ctor === GeneratorFunction ||
        // For the native GeneratorFunction constructor, the best we can
        // do is to check its .name property.
        (ctor.displayName || ctor.name) === "GeneratorFunction"
      : false;
  };

  exports.mark = function(genFun) {
    if (Object.setPrototypeOf) {
      Object.setPrototypeOf(genFun, GeneratorFunctionPrototype);
    } else {
      genFun.__proto__ = GeneratorFunctionPrototype;
      if (!(toStringTagSymbol in genFun)) {
        genFun[toStringTagSymbol] = "GeneratorFunction";
      }
    }
    genFun.prototype = Object.create(Gp);
    return genFun;
  };

  // Within the body of any async function, `await x` is transformed to
  // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test
  // `hasOwn.call(value, "__await")` to determine if the yielded value is
  // meant to be awaited.
  exports.awrap = function(arg) {
    return { __await: arg };
  };

  function AsyncIterator(generator, PromiseImpl) {
    function invoke(method, arg, resolve, reject) {
      var record = tryCatch(generator[method], generator, arg);
      if (record.type === "throw") {
        reject(record.arg);
      } else {
        var result = record.arg;
        var value = result.value;
        if (value &&
            typeof value === "object" &&
            hasOwn.call(value, "__await")) {
          return PromiseImpl.resolve(value.__await).then(function(value) {
            invoke("next", value, resolve, reject);
          }, function(err) {
            invoke("throw", err, resolve, reject);
          });
        }

        return PromiseImpl.resolve(value).then(function(unwrapped) {
          // When a yielded Promise is resolved, its final value becomes
          // the .value of the Promise<{value,done}> result for the
          // current iteration.
          result.value = unwrapped;
          resolve(result);
        }, function(error) {
          // If a rejected Promise was yielded, throw the rejection back
          // into the async generator function so it can be handled there.
          return invoke("throw", error, resolve, reject);
        });
      }
    }

    var previousPromise;

    function enqueue(method, arg) {
      function callInvokeWithMethodAndArg() {
        return new PromiseImpl(function(resolve, reject) {
          invoke(method, arg, resolve, reject);
        });
      }

      return previousPromise =
        // If enqueue has been called before, then we want to wait until
        // all previous Promises have been resolved before calling invoke,
        // so that results are always delivered in the correct order. If
        // enqueue has not been called before, then it is important to
        // call invoke immediately, without waiting on a callback to fire,
        // so that the async generator function has the opportunity to do
        // any necessary setup in a predictable way. This predictability
        // is why the Promise constructor synchronously invokes its
        // executor callback, and why async functions synchronously
        // execute code before the first await. Since we implement simple
        // async functions in terms of async generators, it is especially
        // important to get this right, even though it requires care.
        previousPromise ? previousPromise.then(
          callInvokeWithMethodAndArg,
          // Avoid propagating failures to Promises returned by later
          // invocations of the iterator.
          callInvokeWithMethodAndArg
        ) : callInvokeWithMethodAndArg();
    }

    // Define the unified helper method that is used to implement .next,
    // .throw, and .return (see defineIteratorMethods).
    this._invoke = enqueue;
  }

  defineIteratorMethods(AsyncIterator.prototype);
  AsyncIterator.prototype[asyncIteratorSymbol] = function () {
    return this;
  };
  exports.AsyncIterator = AsyncIterator;

  // Note that simple async functions are implemented on top of
  // AsyncIterator objects; they just return a Promise for the value of
  // the final result produced by the iterator.
  exports.async = function(innerFn, outerFn, self, tryLocsList, PromiseImpl) {
    if (PromiseImpl === void 0) PromiseImpl = Promise;

    var iter = new AsyncIterator(
      wrap(innerFn, outerFn, self, tryLocsList),
      PromiseImpl
    );

    return exports.isGeneratorFunction(outerFn)
      ? iter // If outerFn is a generator, return the full iterator.
      : iter.next().then(function(result) {
          return result.done ? result.value : iter.next();
        });
  };

  function makeInvokeMethod(innerFn, self, context) {
    var state = GenStateSuspendedStart;

    return function invoke(method, arg) {
      if (state === GenStateExecuting) {
        throw new Error("Generator is already running");
      }

      if (state === GenStateCompleted) {
        if (method === "throw") {
          throw arg;
        }

        // Be forgiving, per 25.3.3.3.3 of the spec:
        // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume
        return doneResult();
      }

      context.method = method;
      context.arg = arg;

      while (true) {
        var delegate = context.delegate;
        if (delegate) {
          var delegateResult = maybeInvokeDelegate(delegate, context);
          if (delegateResult) {
            if (delegateResult === ContinueSentinel) continue;
            return delegateResult;
          }
        }

        if (context.method === "next") {
          // Setting context._sent for legacy support of Babel's
          // function.sent implementation.
          context.sent = context._sent = context.arg;

        } else if (context.method === "throw") {
          if (state === GenStateSuspendedStart) {
            state = GenStateCompleted;
            throw context.arg;
          }

          context.dispatchException(context.arg);

        } else if (context.method === "return") {
          context.abrupt("return", context.arg);
        }

        state = GenStateExecuting;

        var record = tryCatch(innerFn, self, context);
        if (record.type === "normal") {
          // If an exception is thrown from innerFn, we leave state ===
          // GenStateExecuting and loop back for another invocation.
          state = context.done
            ? GenStateCompleted
            : GenStateSuspendedYield;

          if (record.arg === ContinueSentinel) {
            continue;
          }

          return {
            value: record.arg,
            done: context.done
          };

        } else if (record.type === "throw") {
          state = GenStateCompleted;
          // Dispatch the exception by looping back around to the
          // context.dispatchException(context.arg) call above.
          context.method = "throw";
          context.arg = record.arg;
        }
      }
    };
  }

  // Call delegate.iterator[context.method](context.arg) and handle the
  // result, either by returning a { value, done } result from the
  // delegate iterator, or by modifying context.method and context.arg,
  // setting context.delegate to null, and returning the ContinueSentinel.
  function maybeInvokeDelegate(delegate, context) {
    var method = delegate.iterator[context.method];
    if (method === undefined) {
      // A .throw or .return when the delegate iterator has no .throw
      // method always terminates the yield* loop.
      context.delegate = null;

      if (context.method === "throw") {
        // Note: ["return"] must be used for ES3 parsing compatibility.
        if (delegate.iterator["return"]) {
          // If the delegate iterator has a return method, give it a
          // chance to clean up.
          context.method = "return";
          context.arg = undefined;
          maybeInvokeDelegate(delegate, context);

          if (context.method === "throw") {
            // If maybeInvokeDelegate(context) changed context.method from
            // "return" to "throw", let that override the TypeError below.
            return ContinueSentinel;
          }
        }

        context.method = "throw";
        context.arg = new TypeError(
          "The iterator does not provide a 'throw' method");
      }

      return ContinueSentinel;
    }

    var record = tryCatch(method, delegate.iterator, context.arg);

    if (record.type === "throw") {
      context.method = "throw";
      context.arg = record.arg;
      context.delegate = null;
      return ContinueSentinel;
    }

    var info = record.arg;

    if (! info) {
      context.method = "throw";
      context.arg = new TypeError("iterator result is not an object");
      context.delegate = null;
      return ContinueSentinel;
    }

    if (info.done) {
      // Assign the result of the finished delegate to the temporary
      // variable specified by delegate.resultName (see delegateYield).
      context[delegate.resultName] = info.value;

      // Resume execution at the desired location (see delegateYield).
      context.next = delegate.nextLoc;

      // If context.method was "throw" but the delegate handled the
      // exception, let the outer generator proceed normally. If
      // context.method was "next", forget context.arg since it has been
      // "consumed" by the delegate iterator. If context.method was
      // "return", allow the original .return call to continue in the
      // outer generator.
      if (context.method !== "return") {
        context.method = "next";
        context.arg = undefined;
      }

    } else {
      // Re-yield the result returned by the delegate method.
      return info;
    }

    // The delegate iterator is finished, so forget it and continue with
    // the outer generator.
    context.delegate = null;
    return ContinueSentinel;
  }

  // Define Generator.prototype.{next,throw,return} in terms of the
  // unified ._invoke helper method.
  defineIteratorMethods(Gp);

  Gp[toStringTagSymbol] = "Generator";

  // A Generator should always return itself as the iterator object when the
  // @@iterator function is called on it. Some browsers' implementations of the
  // iterator prototype chain incorrectly implement this, causing the Generator
  // object to not be returned from this call. This ensures that doesn't happen.
  // See https://github.com/facebook/regenerator/issues/274 for more details.
  Gp[iteratorSymbol] = function() {
    return this;
  };

  Gp.toString = function() {
    return "[object Generator]";
  };

  function pushTryEntry(locs) {
    var entry = { tryLoc: locs[0] };

    if (1 in locs) {
      entry.catchLoc = locs[1];
    }

    if (2 in locs) {
      entry.finallyLoc = locs[2];
      entry.afterLoc = locs[3];
    }

    this.tryEntries.push(entry);
  }

  function resetTryEntry(entry) {
    var record = entry.completion || {};
    record.type = "normal";
    delete record.arg;
    entry.completion = record;
  }

  function Context(tryLocsList) {
    // The root entry object (effectively a try statement without a catch
    // or a finally block) gives us a place to store values thrown from
    // locations where there is no enclosing try statement.
    this.tryEntries = [{ tryLoc: "root" }];
    tryLocsList.forEach(pushTryEntry, this);
    this.reset(true);
  }

  exports.keys = function(object) {
    var keys = [];
    for (var key in object) {
      keys.push(key);
    }
    keys.reverse();

    // Rather than returning an object with a next method, we keep
    // things simple and return the next function itself.
    return function next() {
      while (keys.length) {
        var key = keys.pop();
        if (key in object) {
          next.value = key;
          next.done = false;
          return next;
        }
      }

      // To avoid creating an additional object, we just hang the .value
      // and .done properties off the next function object itself. This
      // also ensures that the minifier will not anonymize the function.
      next.done = true;
      return next;
    };
  };

  function values(iterable) {
    if (iterable) {
      var iteratorMethod = iterable[iteratorSymbol];
      if (iteratorMethod) {
        return iteratorMethod.call(iterable);
      }

      if (typeof iterable.next === "function") {
        return iterable;
      }

      if (!isNaN(iterable.length)) {
        var i = -1, next = function next() {
          while (++i < iterable.length) {
            if (hasOwn.call(iterable, i)) {
              next.value = iterable[i];
              next.done = false;
              return next;
            }
          }

          next.value = undefined;
          next.done = true;

          return next;
        };

        return next.next = next;
      }
    }

    // Return an iterator with no values.
    return { next: doneResult };
  }
  exports.values = values;

  function doneResult() {
    return { value: undefined, done: true };
  }

  Context.prototype = {
    constructor: Context,

    reset: function(skipTempReset) {
      this.prev = 0;
      this.next = 0;
      // Resetting context._sent for legacy support of Babel's
      // function.sent implementation.
      this.sent = this._sent = undefined;
      this.done = false;
      this.delegate = null;

      this.method = "next";
      this.arg = undefined;

      this.tryEntries.forEach(resetTryEntry);

      if (!skipTempReset) {
        for (var name in this) {
          // Not sure about the optimal order of these conditions:
          if (name.charAt(0) === "t" &&
              hasOwn.call(this, name) &&
              !isNaN(+name.slice(1))) {
            this[name] = undefined;
          }
        }
      }
    },

    stop: function() {
      this.done = true;

      var rootEntry = this.tryEntries[0];
      var rootRecord = rootEntry.completion;
      if (rootRecord.type === "throw") {
        throw rootRecord.arg;
      }

      return this.rval;
    },

    dispatchException: function(exception) {
      if (this.done) {
        throw exception;
      }

      var context = this;
      function handle(loc, caught) {
        record.type = "throw";
        record.arg = exception;
        context.next = loc;

        if (caught) {
          // If the dispatched exception was caught by a catch block,
          // then let that catch block handle the exception normally.
          context.method = "next";
          context.arg = undefined;
        }

        return !! caught;
      }

      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
        var entry = this.tryEntries[i];
        var record = entry.completion;

        if (entry.tryLoc === "root") {
          // Exception thrown outside of any try block that could handle
          // it, so set the completion value of the entire function to
          // throw the exception.
          return handle("end");
        }

        if (entry.tryLoc <= this.prev) {
          var hasCatch = hasOwn.call(entry, "catchLoc");
          var hasFinally = hasOwn.call(entry, "finallyLoc");

          if (hasCatch && hasFinally) {
            if (this.prev < entry.catchLoc) {
              return handle(entry.catchLoc, true);
            } else if (this.prev < entry.finallyLoc) {
              return handle(entry.finallyLoc);
            }

          } else if (hasCatch) {
            if (this.prev < entry.catchLoc) {
              return handle(entry.catchLoc, true);
            }

          } else if (hasFinally) {
            if (this.prev < entry.finallyLoc) {
              return handle(entry.finallyLoc);
            }

          } else {
            throw new Error("try statement without catch or finally");
          }
        }
      }
    },

    abrupt: function(type, arg) {
      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
        var entry = this.tryEntries[i];
        if (entry.tryLoc <= this.prev &&
            hasOwn.call(entry, "finallyLoc") &&
            this.prev < entry.finallyLoc) {
          var finallyEntry = entry;
          break;
        }
      }

      if (finallyEntry &&
          (type === "break" ||
           type === "continue") &&
          finallyEntry.tryLoc <= arg &&
          arg <= finallyEntry.finallyLoc) {
        // Ignore the finally entry if control is not jumping to a
        // location outside the try/catch block.
        finallyEntry = null;
      }

      var record = finallyEntry ? finallyEntry.completion : {};
      record.type = type;
      record.arg = arg;

      if (finallyEntry) {
        this.method = "next";
        this.next = finallyEntry.finallyLoc;
        return ContinueSentinel;
      }

      return this.complete(record);
    },

    complete: function(record, afterLoc) {
      if (record.type === "throw") {
        throw record.arg;
      }

      if (record.type === "break" ||
          record.type === "continue") {
        this.next = record.arg;
      } else if (record.type === "return") {
        this.rval = this.arg = record.arg;
        this.method = "return";
        this.next = "end";
      } else if (record.type === "normal" && afterLoc) {
        this.next = afterLoc;
      }

      return ContinueSentinel;
    },

    finish: function(finallyLoc) {
      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
        var entry = this.tryEntries[i];
        if (entry.finallyLoc === finallyLoc) {
          this.complete(entry.completion, entry.afterLoc);
          resetTryEntry(entry);
          return ContinueSentinel;
        }
      }
    },

    "catch": function(tryLoc) {
      for (var i = this.tryEntries.length - 1; i >= 0; --i) {
        var entry = this.tryEntries[i];
        if (entry.tryLoc === tryLoc) {
          var record = entry.completion;
          if (record.type === "throw") {
            var thrown = record.arg;
            resetTryEntry(entry);
          }
          return thrown;
        }
      }

      // The context.catch method must only be called with a location
      // argument that corresponds to a known catch block.
      throw new Error("illegal catch attempt");
    },

    delegateYield: function(iterable, resultName, nextLoc) {
      this.delegate = {
        iterator: values(iterable),
        resultName: resultName,
        nextLoc: nextLoc
      };

      if (this.method === "next") {
        // Deliberately forget the last sent value so that we don't
        // accidentally pass it on to the delegate.
        this.arg = undefined;
      }

      return ContinueSentinel;
    }
  };

  // Regardless of whether this script is executing as a CommonJS module
  // or not, return the runtime object so that we can declare the variable
  // regeneratorRuntime in the outer scope, which allows this module to be
  // injected easily by `bin/regenerator --include-runtime script.js`.
  return exports;

}(
  // If this script is executing as a CommonJS module, use module.exports
  // as the regeneratorRuntime namespace. Otherwise create a new empty
  // object. Either way, the resulting object will be used to initialize
  // the regeneratorRuntime variable at the top of this file.
   true ? module.exports : undefined
));

try {
  regeneratorRuntime = runtime;
} catch (accidentalStrictMode) {
  // This module should not be running in strict mode, so the above
  // assignment should always work unless something is misconfigured. Just
  // in case runtime.js accidentally runs in strict mode, we can escape
  // strict mode using a global Function call. This could conceivably fail
  // if a Content Security Policy forbids using Function, but in that case
  // the proper solution is to fix the accidental strict mode problem. If
  // you've misconfigured your bundler to force strict mode and applied a
  // CSP to forbid Function, and you're not willing to fix either of those
  // problems, please detail your unique predicament in a GitHub issue.
  Function("r", "regeneratorRuntime = r")(runtime);
}


/***/ })

}]);
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