Update 'js/visualUI/functions.js'

Introduced "msg_err" in "uploadFile(.)" to help debug.

js/visualUI/functions.js

@@ -1513,35 +1513,41 @@ function uploadFile (evt) {
 
   oFReader.onload = function (oFREvent) {
     var txt = oFREvent.target.result;
+    var msg_err = ""; // help debug
     try {
-      if (txt.indexOf("::algorithm::") >= 0 || txt.indexOf("\"test_cases\"") >= 0) {
-        //leo/lucas Version with "test-cases": { "version": "x.y",\n "code": ... \n "test_cases":...
+      if (txt.indexOf("::algorithm::") >= 0 || txt.indexOf('"test_cases"') >= 0) {
+        //leo/lucas Version with "test-cases": { "version": "x.y",\n "code": ... \n "test_cases":... }
+        msg_err += "(1) Inside if ::algorithm:: or test_cases\n";
         prepareActivityToStudent(txt, true); // in ./src/ivprog/js/iassign-integration-functions.js
+        msg_err += "(2) After prepareActivityToStudent(.)\n";
         console.debug("js/visualUI/functions.js!uploadFile(.): code=" + txt.code);
-        }
-      else {
+      } else {
         //N ivprogCore.setPreviousAlgorithm(txt);
         //N window.renderAlgorithm();
-
         //N Gleyce: start
+        msg_err += "(3) Inside else\n";
+
         // First try the old iVProg syntax to program (translate texto to data object)
         console.log("js/visualUI/functions.js!uploadFile(.): read IVPH (allow comment)");
         const code_obj = textParser(txt);
         if (code_obj) {
           // If succeed, translate data objects to visual block 
           modelParser(code_obj);
+          msg_err += "(4) Inside code_obj after modelParser(.)\n";
           // Render algorithm into the visual interface
           window.renderAlgorithm();
+          msg_err += "(5) Inside code_obj after window.renderAlgorithm()\n";
         } else {
           // If first try failed, present a warning
           console.error("js/visualUI/functions.js: failed in the translation from texto to iVProg code");
           alert("Something was wrong! Please, check if the syntax code of your file is valid to iVProg");
           }
         //N Gleyce: end
-
         }
     } catch (e) {
-      console.log(e)
+      // console.log(e); - to avoid error in printing: TypeError: cyclic object
+      // try with JSON.stringify(e)?
+      console.log("js/visualUI/functions.js!uploadFile(.): erro!\n" + msg_err);
       }
-    };
-  }
+    }; // oFReader.onload = function(oFREvent)
+  } // function uploadFile(evt)