/*
 * Generated by PEG.js 0.10.0.
 *
 * http://pegjs.org/
 */

"use strict";

function peg$subclass(child, parent) {
  function ctor() { this.constructor = child; }
  ctor.prototype = parent.prototype;
  child.prototype = new ctor();
}

function peg$SyntaxError(message, expected, found, location) {
  this.message  = message;
  this.expected = expected;
  this.found    = found;
  this.location = location;
  this.name     = "SyntaxError";

  if (typeof Error.captureStackTrace === "function") {
    Error.captureStackTrace(this, peg$SyntaxError);
  }
}

peg$subclass(peg$SyntaxError, Error);

peg$SyntaxError.buildMessage = function(expected, found) {
  var DESCRIBE_EXPECTATION_FNS = {
        literal: function(expectation) {
          return "\"" + literalEscape(expectation.text) + "\"";
        },

        "class": function(expectation) {
          var escapedParts = "",
              i;

          for (i = 0; i < expectation.parts.length; i++) {
            escapedParts += expectation.parts[i] instanceof Array
              ? classEscape(expectation.parts[i][0]) + "-" + classEscape(expectation.parts[i][1])
              : classEscape(expectation.parts[i]);
          }

          return "[" + (expectation.inverted ? "^" : "") + escapedParts + "]";
        },

        any: function(expectation) {
          return "any character";
        },

        end: function(expectation) {
          return "end of input";
        },

        other: function(expectation) {
          return expectation.description;
        }
      };

  function hex(ch) {
    return ch.charCodeAt(0).toString(16).toUpperCase();
  }

  function literalEscape(s) {
    return s
      .replace(/\\/g, '\\\\')
      .replace(/"/g,  '\\"')
      .replace(/\0/g, '\\0')
      .replace(/\t/g, '\\t')
      .replace(/\n/g, '\\n')
      .replace(/\r/g, '\\r')
      .replace(/[\x00-\x0F]/g,          function(ch) { return '\\x0' + hex(ch); })
      .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return '\\x'  + hex(ch); });
  }

  function classEscape(s) {
    return s
      .replace(/\\/g, '\\\\')
      .replace(/\]/g, '\\]')
      .replace(/\^/g, '\\^')
      .replace(/-/g,  '\\-')
      .replace(/\0/g, '\\0')
      .replace(/\t/g, '\\t')
      .replace(/\n/g, '\\n')
      .replace(/\r/g, '\\r')
      .replace(/[\x00-\x0F]/g,          function(ch) { return '\\x0' + hex(ch); })
      .replace(/[\x10-\x1F\x7F-\x9F]/g, function(ch) { return '\\x'  + hex(ch); });
  }

  function describeExpectation(expectation) {
    return DESCRIBE_EXPECTATION_FNS[expectation.type](expectation);
  }

  function describeExpected(expected) {
    var descriptions = new Array(expected.length),
        i, j;

    for (i = 0; i < expected.length; i++) {
      descriptions[i] = describeExpectation(expected[i]);
    }

    descriptions.sort();

    if (descriptions.length > 0) {
      for (i = 1, j = 1; i < descriptions.length; i++) {
        if (descriptions[i - 1] !== descriptions[i]) {
          descriptions[j] = descriptions[i];
          j++;
        }
      }
      descriptions.length = j;
    }

    switch (descriptions.length) {
      case 1:
        return descriptions[0];

      case 2:
        return descriptions[0] + " or " + descriptions[1];

      default:
        return descriptions.slice(0, -1).join(", ")
          + ", or "
          + descriptions[descriptions.length - 1];
    }
  }

  function describeFound(found) {
    return found ? "\"" + literalEscape(found) + "\"" : "end of input";
  }

  return "Expected " + describeExpected(expected) + " but " + describeFound(found) + " found.";
};

function peg$parse(input, options) {
  options = options !== void 0 ? options : {};

  var peg$FAILED = {},

      peg$startRuleFunctions = { GIFTQuestions: peg$parseGIFTQuestions },
      peg$startRuleFunction  = peg$parseGIFTQuestions,

      peg$c0 = function(questions) { return questions; },
      peg$c1 = peg$otherExpectation("Category"),
      peg$c2 = "$",
      peg$c3 = peg$literalExpectation("$", false),
      peg$c4 = "CATEGORY:",
      peg$c5 = peg$literalExpectation("CATEGORY:", false),
      peg$c6 = function(cat) {return {type:"Category", title:cat}},
      peg$c7 = peg$otherExpectation("Description"),
      peg$c8 = function(title, text) { var question = {id: questionId, tags: questionTags, type:"Description", title:title, stem:text, hasEmbeddedAnswers:false};
            resetLastQuestionTextFormat(); 
            questionId = null; questionTags = null;
            return question },
      peg$c9 = "{",
      peg$c10 = peg$literalExpectation("{", false),
      peg$c11 = "}",
      peg$c12 = peg$literalExpectation("}", false),
      peg$c13 = function(title, stem1, answers, stem2) {    
          var embedded = (stem2 !== null);    
          var stem1Text = stem1 ? (stem1.text + (embedded ? " " : "")) : "";

          var format = (stem1 && stem1.format) || (stem2 && stem2.format) || "moodle";
          var text = stem1Text + ( embedded ? "_____ " + stem2.text : "");
          
          var question = {type:answers.type, title:title, stem: {format: format, text: text}, hasEmbeddedAnswers:embedded};
          question = processAnswers(question, answers);
          resetLastQuestionTextFormat();
          return question;
        },
      peg$c14 = peg$otherExpectation("{= match1 -> Match1\n...}"),
      peg$c15 = function(matchPairs, globalFeedback) { return { type: "Matching", matchPairs:matchPairs, globalFeedback:globalFeedback }; },
      peg$c16 = peg$otherExpectation("matches"),
      peg$c17 = function(matchPairs) { return matchPairs },
      peg$c18 = peg$otherExpectation("match"),
      peg$c19 = "=",
      peg$c20 = peg$literalExpectation("=", false),
      peg$c21 = "->",
      peg$c22 = peg$literalExpectation("->", false),
      peg$c23 = function(left, right) { var matchPair = { 
              subquestion:{
                format:(left !== null ? left.format : getLastQuestionTextFormat()), 
                text:(left !== null ? left.text : "")
              }, 
              subanswer:right}; 
              return matchPair },
      peg$c24 = peg$otherExpectation("{T} or {F} or {TRUE} or {FALSE}"),
      peg$c25 = function(isTrue, feedback, globalFeedback) { return { type:"TF", isTrue: isTrue, feedback:feedback, globalFeedback:globalFeedback}; },
      peg$c26 = function(isTrue) { return isTrue },
      peg$c27 = "TRUE",
      peg$c28 = peg$literalExpectation("TRUE", false),
      peg$c29 = "T",
      peg$c30 = peg$literalExpectation("T", false),
      peg$c31 = function() {return true},
      peg$c32 = "FALSE",
      peg$c33 = peg$literalExpectation("FALSE", false),
      peg$c34 = "F",
      peg$c35 = peg$literalExpectation("F", false),
      peg$c36 = function() {return false},
      peg$c37 = peg$otherExpectation("{=correct choice ~incorrect choice ... }"),
      peg$c38 = function(choices, globalFeedback) { return { type: "MC", choices:choices, globalFeedback:globalFeedback}; },
      peg$c39 = peg$otherExpectation("Choices"),
      peg$c40 = function(choices) { return choices; },
      peg$c41 = peg$otherExpectation("Choice"),
      peg$c42 = /^[=~]/,
      peg$c43 = peg$classExpectation(["=", "~"], false, false),
      peg$c44 = function(choice, feedback) { var wt = choice[2];
            var txt = choice[4];
            var choice = { isCorrect: (choice[0] == '='), 
                           weight:wt, 
                           text: txt,
                           feedback:feedback };
            return choice },
      peg$c45 = peg$otherExpectation("(weight)"),
      peg$c46 = "%",
      peg$c47 = peg$literalExpectation("%", false),
      peg$c48 = function(percent) {
      	return percent;
        },
      peg$c49 = peg$otherExpectation("(percent)"),
      peg$c50 = peg$anyExpectation(),
      peg$c51 = function(percent) {
            let error = 'a value between -100 and 100'
            if (percent.length == 0) expected(error + ' (did you forget to put a value?)');
            // the !'%' shows up as a 0th element in the percent array (of arrays), so we have to join the 1th elements
      	  const pct = parseFloat(percent.map(innerArray => innerArray[1]).join(""));
            if (pct >= -100 && pct <= 100) {
              return pct;
            } else {
              expected(error)
            }
          },
      peg$c52 = peg$otherExpectation("(feedback)"),
      peg$c53 = "#",
      peg$c54 = peg$literalExpectation("#", false),
      peg$c55 = "###",
      peg$c56 = peg$literalExpectation("###", false),
      peg$c57 = function(feedback) { return feedback },
      peg$c58 = peg$otherExpectation("Essay question { ... }"),
      peg$c59 = "",
      peg$c60 = function(globalFeedback) { return { type: "Essay", globalFeedback:globalFeedback}; },
      peg$c61 = peg$otherExpectation("Single short answer { ... }"),
      peg$c62 = function(answer, feedback, globalFeedback) { var choices = [];
          choices.push({isCorrect:true, text:answer, feedback:feedback, weight:null});
          return { type: "Short", choices:choices, globalFeedback:globalFeedback}; },
      peg$c63 = peg$otherExpectation("{#... }"),
      peg$c64 = function(numericalAnswers, globalFeedback) { return { type:"Numerical", 
                   choices:numericalAnswers, 
                   globalFeedback:globalFeedback}; },
      peg$c65 = peg$otherExpectation("Numerical Answers"),
      peg$c66 = peg$otherExpectation("Multiple Numerical Choices"),
      peg$c67 = peg$otherExpectation("Numerical Choice"),
      peg$c68 = function(choice, feedback) { var symbol = choice[0];
            var wt = choice[1];
            var txt = choice[2];
            var choice = { isCorrect:(symbol == '='), 
                           weight:wt, 
                           text: (txt !== null ? txt : {format:getLastQuestionTextFormat(), text:'*'}), // Moodle unit tests show this, not in documentation
                           feedback: feedback }; 
            return choice },
      peg$c69 = peg$otherExpectation("Single numeric answer"),
      peg$c70 = peg$otherExpectation("(number with range)"),
      peg$c71 = ":",
      peg$c72 = peg$literalExpectation(":", false),
      peg$c73 = function(number, range) { var numericAnswer = {type: 'range', number: number, range:range}; return numericAnswer},
      peg$c74 = peg$otherExpectation("(number with high-low)"),
      peg$c75 = "..",
      peg$c76 = peg$literalExpectation("..", false),
      peg$c77 = function(numberLow, numberHigh) { var numericAnswer = {type: 'high-low', numberHigh: numberHigh, numberLow:numberLow}; return numericAnswer},
      peg$c78 = peg$otherExpectation("(number answer)"),
      peg$c79 = function(number) { var numericAnswer = {type: 'simple', number: number}; return numericAnswer},
      peg$c80 = peg$otherExpectation(":: Title ::"),
      peg$c81 = "::",
      peg$c82 = peg$literalExpectation("::", false),
      peg$c83 = function(title) { return escapedCharacterDecode(title.join('')) },
      peg$c84 = peg$otherExpectation("Question stem"),
      peg$c85 = function(stem) { setLastQuestionTextFormat(stem.format); // save format for question, for default of other non-formatted text
            return stem },
      peg$c86 = peg$otherExpectation("(blank lines separator)"),
      peg$c87 = peg$otherExpectation("(blank lines)"),
      peg$c88 = peg$otherExpectation("blank line"),
      peg$c89 = peg$otherExpectation("(Title text)"),
      peg$c90 = function(t) {return t},
      peg$c91 = peg$otherExpectation("(text character)"),
      peg$c92 = peg$otherExpectation("format"),
      peg$c93 = "[",
      peg$c94 = peg$literalExpectation("[", false),
      peg$c95 = "html",
      peg$c96 = peg$literalExpectation("html", false),
      peg$c97 = "markdown",
      peg$c98 = peg$literalExpectation("markdown", false),
      peg$c99 = "plain",
      peg$c100 = peg$literalExpectation("plain", false),
      peg$c101 = "moodle",
      peg$c102 = peg$literalExpectation("moodle", false),
      peg$c103 = "]",
      peg$c104 = peg$literalExpectation("]", false),
      peg$c105 = function(format) {return format},
      peg$c106 = peg$otherExpectation("(escape character)"),
      peg$c107 = "\\",
      peg$c108 = peg$literalExpectation("\\", false),
      peg$c109 = peg$otherExpectation("escape sequence"),
      peg$c110 = "~",
      peg$c111 = peg$literalExpectation("~", false),
      peg$c112 = "n",
      peg$c113 = peg$literalExpectation("n", false),
      peg$c114 = function(char) {
          return escapedCharacters['\\' + char];
          },
      peg$c115 = peg$otherExpectation(""),
      peg$c116 = function() {return text()},
      peg$c117 = peg$otherExpectation("(formatted text excluding '->')"),
      peg$c118 = function(format, txt) { return formattedText(format, txt) },
      peg$c119 = peg$otherExpectation("(formatted text)"),
      peg$c120 = peg$otherExpectation("(unformatted text)"),
      peg$c121 = function(txt) { return removeNewLinesDuplicateSpaces(txt.join('').trim())},
      peg$c122 = peg$otherExpectation("(category text)"),
      peg$c123 = function(txt) { return txt.flat().join('') },
      peg$c124 = function() { return parseFloat(text()); },
      peg$c125 = ".",
      peg$c126 = peg$literalExpectation(".", false),
      peg$c127 = /^[0-9]/,
      peg$c128 = peg$classExpectation([["0", "9"]], false, false),
      peg$c129 = /^[+\-]/,
      peg$c130 = peg$classExpectation(["+", "-"], false, false),
      peg$c131 = "####",
      peg$c132 = peg$literalExpectation("####", false),
      peg$c133 = function(rt) {return rt;},
      peg$c134 = peg$otherExpectation("(single line whitespace)"),
      peg$c135 = peg$otherExpectation("(multiple line whitespace)"),
      peg$c136 = " ",
      peg$c137 = peg$literalExpectation(" ", false),
      peg$c138 = function() {questionId = null; questionTags = null},
      peg$c139 = peg$otherExpectation("(comment)"),
      peg$c140 = "//",
      peg$c141 = peg$literalExpectation("//", false),
      peg$c142 = /^[^\n\r]/,
      peg$c143 = peg$classExpectation(["\n", "\r"], true, false),
      peg$c144 = function(p) {return null},
      peg$c145 = function(p) {
          var comment = p.join("");
          // use a regex like the Moodle parser
          var idIsFound = comment.match(/\[id:([^\x00-\x1F\x7F]+?)]/); 
          if(idIsFound) {
              questionId = idIsFound[1].trim().replace('\\]', ']');
          }
          
          // use a regex like the Moodle parser
          var tagMatches = comment.matchAll(/\[tag:([^\x00-\x1F\x7F]+?)]/g);
          Array.from(
            comment.matchAll(/\[tag:([^\x00-\x1F\x7F]+?)]/g), 
                             function(m) { return m[1] })
                    .forEach(function(element) {
                      if(!questionTags) questionTags = [];
                      questionTags.push(element);
                    });
          return null // hacking, must "reset" values each time a partial match happens
        },
      peg$c146 = peg$otherExpectation("(space)"),
      peg$c147 = "\t",
      peg$c148 = peg$literalExpectation("\t", false),
      peg$c149 = peg$otherExpectation("(end of line)"),
      peg$c150 = "\r\n",
      peg$c151 = peg$literalExpectation("\r\n", false),
      peg$c152 = "\n",
      peg$c153 = peg$literalExpectation("\n", false),
      peg$c154 = "\r",
      peg$c155 = peg$literalExpectation("\r", false),
      peg$c156 = function() { return "EOF"; },

      peg$currPos          = 0,
      peg$savedPos         = 0,
      peg$posDetailsCache  = [{ line: 1, column: 1 }],
      peg$maxFailPos       = 0,
      peg$maxFailExpected  = [],
      peg$silentFails      = 0,

      peg$result;

  if ("startRule" in options) {
    if (!(options.startRule in peg$startRuleFunctions)) {
      throw new Error("Can't start parsing from rule \"" + options.startRule + "\".");
    }

    peg$startRuleFunction = peg$startRuleFunctions[options.startRule];
  }

  function text() {
    return input.substring(peg$savedPos, peg$currPos);
  }

  function location() {
    return peg$computeLocation(peg$savedPos, peg$currPos);
  }

  function expected(description, location) {
    location = location !== void 0 ? location : peg$computeLocation(peg$savedPos, peg$currPos)

    throw peg$buildStructuredError(
      [peg$otherExpectation(description)],
      input.substring(peg$savedPos, peg$currPos),
      location
    );
  }

  function error(message, location) {
    location = location !== void 0 ? location : peg$computeLocation(peg$savedPos, peg$currPos)

    throw peg$buildSimpleError(message, location);
  }

  function peg$literalExpectation(text, ignoreCase) {
    return { type: "literal", text: text, ignoreCase: ignoreCase };
  }

  function peg$classExpectation(parts, inverted, ignoreCase) {
    return { type: "class", parts: parts, inverted: inverted, ignoreCase: ignoreCase };
  }

  function peg$anyExpectation() {
    return { type: "any" };
  }

  function peg$endExpectation() {
    return { type: "end" };
  }

  function peg$otherExpectation(description) {
    return { type: "other", description: description };
  }

  function peg$computePosDetails(pos) {
    var details = peg$posDetailsCache[pos], p;

    if (details) {
      return details;
    } else {
      p = pos - 1;
      while (!peg$posDetailsCache[p]) {
        p--;
      }

      details = peg$posDetailsCache[p];
      details = {
        line:   details.line,
        column: details.column
      };

      while (p < pos) {
        if (input.charCodeAt(p) === 10) {
          details.line++;
          details.column = 1;
        } else {
          details.column++;
        }

        p++;
      }

      peg$posDetailsCache[pos] = details;
      return details;
    }
  }

  function peg$computeLocation(startPos, endPos) {
    var startPosDetails = peg$computePosDetails(startPos),
        endPosDetails   = peg$computePosDetails(endPos);

    return {
      start: {
        offset: startPos,
        line:   startPosDetails.line,
        column: startPosDetails.column
      },
      end: {
        offset: endPos,
        line:   endPosDetails.line,
        column: endPosDetails.column
      }
    };
  }

  function peg$fail(expected) {
    if (peg$currPos < peg$maxFailPos) { return; }

    if (peg$currPos > peg$maxFailPos) {
      peg$maxFailPos = peg$currPos;
      peg$maxFailExpected = [];
    }

    peg$maxFailExpected.push(expected);
  }

  function peg$buildSimpleError(message, location) {
    return new peg$SyntaxError(message, null, null, location);
  }

  function peg$buildStructuredError(expected, found, location) {
    return new peg$SyntaxError(
      peg$SyntaxError.buildMessage(expected, found),
      expected,
      found,
      location
    );
  }

  function peg$parseGIFTQuestions() {
    var s0, s1, s2, s3;

    s0 = peg$currPos;
    s1 = [];
    s2 = peg$parseCategory();
    if (s2 === peg$FAILED) {
      s2 = peg$parseDescription();
      if (s2 === peg$FAILED) {
        s2 = peg$parseQuestion();
      }
    }
    if (s2 !== peg$FAILED) {
      while (s2 !== peg$FAILED) {
        s1.push(s2);
        s2 = peg$parseCategory();
        if (s2 === peg$FAILED) {
          s2 = peg$parseDescription();
          if (s2 === peg$FAILED) {
            s2 = peg$parseQuestion();
          }
        }
      }
    } else {
      s1 = peg$FAILED;
    }
    if (s1 !== peg$FAILED) {
      s2 = peg$parse_();
      if (s2 !== peg$FAILED) {
        s3 = peg$parse__();
        if (s3 !== peg$FAILED) {
          peg$savedPos = s0;
          s1 = peg$c0(s1);
          s0 = s1;
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parseCategory() {
    var s0, s1, s2, s3, s4, s5, s6, s7;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parseResetIdsTags();
    if (s1 !== peg$FAILED) {
      s2 = peg$parse__();
      if (s2 !== peg$FAILED) {
        if (input.charCodeAt(peg$currPos) === 36) {
          s3 = peg$c2;
          peg$currPos++;
        } else {
          s3 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$c3); }
        }
        if (s3 !== peg$FAILED) {
          if (input.substr(peg$currPos, 9) === peg$c4) {
            s4 = peg$c4;
            peg$currPos += 9;
          } else {
            s4 = peg$FAILED;
            if (peg$silentFails === 0) { peg$fail(peg$c5); }
          }
          if (s4 !== peg$FAILED) {
            s5 = peg$parse_();
            if (s5 !== peg$FAILED) {
              s6 = peg$parseCategoryText();
              if (s6 !== peg$FAILED) {
                s7 = peg$parseQuestionSeparator();
                if (s7 !== peg$FAILED) {
                  peg$savedPos = s0;
                  s1 = peg$c6(s6);
                  s0 = s1;
                } else {
                  peg$currPos = s0;
                  s0 = peg$FAILED;
                }
              } else {
                peg$currPos = s0;
                s0 = peg$FAILED;
              }
            } else {
              peg$currPos = s0;
              s0 = peg$FAILED;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c1); }
    }

    return s0;
  }

  function peg$parseDescription() {
    var s0, s1, s2, s3, s4, s5, s6, s7;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parseResetIdsTags();
    if (s1 !== peg$FAILED) {
      s2 = peg$parse__();
      if (s2 !== peg$FAILED) {
        s3 = [];
        s4 = peg$parseTagComment();
        while (s4 !== peg$FAILED) {
          s3.push(s4);
          s4 = peg$parseTagComment();
        }
        if (s3 !== peg$FAILED) {
          s4 = peg$parseQuestionTitle();
          if (s4 === peg$FAILED) {
            s4 = null;
          }
          if (s4 !== peg$FAILED) {
            s5 = peg$parse_();
            if (s5 !== peg$FAILED) {
              s6 = peg$parseQuestionStem();
              if (s6 !== peg$FAILED) {
                s7 = peg$parseQuestionSeparator();
                if (s7 !== peg$FAILED) {
                  peg$savedPos = s0;
                  s1 = peg$c8(s4, s6);
                  s0 = s1;
                } else {
                  peg$currPos = s0;
                  s0 = peg$FAILED;
                }
              } else {
                peg$currPos = s0;
                s0 = peg$FAILED;
              }
            } else {
              peg$currPos = s0;
              s0 = peg$FAILED;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c7); }
    }

    return s0;
  }

  function peg$parseQuestion() {
    var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9, s10, s11, s12, s13, s14, s15;

    s0 = peg$currPos;
    s1 = peg$parseResetIdsTags();
    if (s1 !== peg$FAILED) {
      s2 = peg$parse__();
      if (s2 !== peg$FAILED) {
        s3 = [];
        s4 = peg$parseTagComment();
        while (s4 !== peg$FAILED) {
          s3.push(s4);
          s4 = peg$parseTagComment();
        }
        if (s3 !== peg$FAILED) {
          s4 = peg$parseQuestionTitle();
          if (s4 === peg$FAILED) {
            s4 = null;
          }
          if (s4 !== peg$FAILED) {
            s5 = peg$parse_();
            if (s5 !== peg$FAILED) {
              s6 = peg$parseQuestionStem();
              if (s6 === peg$FAILED) {
                s6 = null;
              }
              if (s6 !== peg$FAILED) {
                s7 = peg$parse_();
                if (s7 !== peg$FAILED) {
                  if (input.charCodeAt(peg$currPos) === 123) {
                    s8 = peg$c9;
                    peg$currPos++;
                  } else {
                    s8 = peg$FAILED;
                    if (peg$silentFails === 0) { peg$fail(peg$c10); }
                  }
                  if (s8 !== peg$FAILED) {
                    s9 = peg$parse_();
                    if (s9 !== peg$FAILED) {
                      s10 = peg$parseMatchingAnswers();
                      if (s10 === peg$FAILED) {
                        s10 = peg$parseTrueFalseAnswer();
                        if (s10 === peg$FAILED) {
                          s10 = peg$parseMCAnswers();
                          if (s10 === peg$FAILED) {
                            s10 = peg$parseNumericalAnswerType();
                            if (s10 === peg$FAILED) {
                              s10 = peg$parseSingleCorrectShortAnswer();
                              if (s10 === peg$FAILED) {
                                s10 = peg$parseEssayAnswer();
                              }
                            }
                          }
                        }
                      }
                      if (s10 !== peg$FAILED) {
                        s11 = peg$parse_();
                        if (s11 !== peg$FAILED) {
                          if (input.charCodeAt(peg$currPos) === 125) {
                            s12 = peg$c11;
                            peg$currPos++;
                          } else {
                            s12 = peg$FAILED;
                            if (peg$silentFails === 0) { peg$fail(peg$c12); }
                          }
                          if (s12 !== peg$FAILED) {
                            s13 = peg$parse_();
                            if (s13 !== peg$FAILED) {
                              s14 = peg$parseComment();
                              if (s14 === peg$FAILED) {
                                s14 = peg$parseQuestionStem();
                              }
                              if (s14 === peg$FAILED) {
                                s14 = null;
                              }
                              if (s14 !== peg$FAILED) {
                                s15 = peg$parseQuestionSeparator();
                                if (s15 !== peg$FAILED) {
                                  peg$savedPos = s0;
                                  s1 = peg$c13(s4, s6, s10, s14);
                                  s0 = s1;
                                } else {
                                  peg$currPos = s0;
                                  s0 = peg$FAILED;
                                }
                              } else {
                                peg$currPos = s0;
                                s0 = peg$FAILED;
                              }
                            } else {
                              peg$currPos = s0;
                              s0 = peg$FAILED;
                            }
                          } else {
                            peg$currPos = s0;
                            s0 = peg$FAILED;
                          }
                        } else {
                          peg$currPos = s0;
                          s0 = peg$FAILED;
                        }
                      } else {
                        peg$currPos = s0;
                        s0 = peg$FAILED;
                      }
                    } else {
                      peg$currPos = s0;
                      s0 = peg$FAILED;
                    }
                  } else {
                    peg$currPos = s0;
                    s0 = peg$FAILED;
                  }
                } else {
                  peg$currPos = s0;
                  s0 = peg$FAILED;
                }
              } else {
                peg$currPos = s0;
                s0 = peg$FAILED;
              }
            } else {
              peg$currPos = s0;
              s0 = peg$FAILED;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parseMatchingAnswers() {
    var s0, s1, s2, s3, s4;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parseMatches();
    if (s1 !== peg$FAILED) {
      s2 = peg$parse_();
      if (s2 !== peg$FAILED) {
        s3 = peg$parseGlobalFeedback();
        if (s3 === peg$FAILED) {
          s3 = null;
        }
        if (s3 !== peg$FAILED) {
          s4 = peg$parse_();
          if (s4 !== peg$FAILED) {
            peg$savedPos = s0;
            s1 = peg$c15(s1, s3);
            s0 = s1;
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c14); }
    }

    return s0;
  }

  function peg$parseMatches() {
    var s0, s1, s2;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = [];
    s2 = peg$parseMatch();
    if (s2 !== peg$FAILED) {
      while (s2 !== peg$FAILED) {
        s1.push(s2);
        s2 = peg$parseMatch();
      }
    } else {
      s1 = peg$FAILED;
    }
    if (s1 !== peg$FAILED) {
      peg$savedPos = s0;
      s1 = peg$c17(s1);
    }
    s0 = s1;
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c16); }
    }

    return s0;
  }

  function peg$parseMatch() {
    var s0, s1, s2, s3, s4, s5, s6, s7, s8, s9;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parse_();
    if (s1 !== peg$FAILED) {
      if (input.charCodeAt(peg$currPos) === 61) {
        s2 = peg$c19;
        peg$currPos++;
      } else {
        s2 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c20); }
      }
      if (s2 !== peg$FAILED) {
        s3 = peg$parse_();
        if (s3 !== peg$FAILED) {
          s4 = peg$parseMatchRichText();
          if (s4 === peg$FAILED) {
            s4 = null;
          }
          if (s4 !== peg$FAILED) {
            s5 = peg$parse_();
            if (s5 !== peg$FAILED) {
              if (input.substr(peg$currPos, 2) === peg$c21) {
                s6 = peg$c21;
                peg$currPos += 2;
              } else {
                s6 = peg$FAILED;
                if (peg$silentFails === 0) { peg$fail(peg$c22); }
              }
              if (s6 !== peg$FAILED) {
                s7 = peg$parse_();
                if (s7 !== peg$FAILED) {
                  s8 = peg$parsePlainText();
                  if (s8 !== peg$FAILED) {
                    s9 = peg$parse_();
                    if (s9 !== peg$FAILED) {
                      peg$savedPos = s0;
                      s1 = peg$c23(s4, s8);
                      s0 = s1;
                    } else {
                      peg$currPos = s0;
                      s0 = peg$FAILED;
                    }
                  } else {
                    peg$currPos = s0;
                    s0 = peg$FAILED;
                  }
                } else {
                  peg$currPos = s0;
                  s0 = peg$FAILED;
                }
              } else {
                peg$currPos = s0;
                s0 = peg$FAILED;
              }
            } else {
              peg$currPos = s0;
              s0 = peg$FAILED;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c18); }
    }

    return s0;
  }

  function peg$parseTrueFalseAnswer() {
    var s0, s1, s2, s3, s4, s5;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parseTrueOrFalseType();
    if (s1 !== peg$FAILED) {
      s2 = peg$parse_();
      if (s2 !== peg$FAILED) {
        s3 = peg$currPos;
        s4 = peg$parseFeedback();
        if (s4 === peg$FAILED) {
          s4 = null;
        }
        if (s4 !== peg$FAILED) {
          s5 = peg$parseFeedback();
          if (s5 === peg$FAILED) {
            s5 = null;
          }
          if (s5 !== peg$FAILED) {
            s4 = [s4, s5];
            s3 = s4;
          } else {
            peg$currPos = s3;
            s3 = peg$FAILED;
          }
        } else {
          peg$currPos = s3;
          s3 = peg$FAILED;
        }
        if (s3 !== peg$FAILED) {
          s4 = peg$parse_();
          if (s4 !== peg$FAILED) {
            s5 = peg$parseGlobalFeedback();
            if (s5 === peg$FAILED) {
              s5 = null;
            }
            if (s5 !== peg$FAILED) {
              peg$savedPos = s0;
              s1 = peg$c25(s1, s3, s5);
              s0 = s1;
            } else {
              peg$currPos = s0;
              s0 = peg$FAILED;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c24); }
    }

    return s0;
  }

  function peg$parseTrueOrFalseType() {
    var s0, s1;

    s0 = peg$currPos;
    s1 = peg$parseTrueType();
    if (s1 === peg$FAILED) {
      s1 = peg$parseFalseType();
    }
    if (s1 !== peg$FAILED) {
      peg$savedPos = s0;
      s1 = peg$c26(s1);
    }
    s0 = s1;

    return s0;
  }

  function peg$parseTrueType() {
    var s0, s1;

    s0 = peg$currPos;
    if (input.substr(peg$currPos, 4) === peg$c27) {
      s1 = peg$c27;
      peg$currPos += 4;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c28); }
    }
    if (s1 === peg$FAILED) {
      if (input.charCodeAt(peg$currPos) === 84) {
        s1 = peg$c29;
        peg$currPos++;
      } else {
        s1 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c30); }
      }
    }
    if (s1 !== peg$FAILED) {
      peg$savedPos = s0;
      s1 = peg$c31();
    }
    s0 = s1;

    return s0;
  }

  function peg$parseFalseType() {
    var s0, s1;

    s0 = peg$currPos;
    if (input.substr(peg$currPos, 5) === peg$c32) {
      s1 = peg$c32;
      peg$currPos += 5;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c33); }
    }
    if (s1 === peg$FAILED) {
      if (input.charCodeAt(peg$currPos) === 70) {
        s1 = peg$c34;
        peg$currPos++;
      } else {
        s1 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c35); }
      }
    }
    if (s1 !== peg$FAILED) {
      peg$savedPos = s0;
      s1 = peg$c36();
    }
    s0 = s1;

    return s0;
  }

  function peg$parseMCAnswers() {
    var s0, s1, s2, s3, s4;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parseChoices();
    if (s1 !== peg$FAILED) {
      s2 = peg$parse_();
      if (s2 !== peg$FAILED) {
        s3 = peg$parseGlobalFeedback();
        if (s3 === peg$FAILED) {
          s3 = null;
        }
        if (s3 !== peg$FAILED) {
          s4 = peg$parse_();
          if (s4 !== peg$FAILED) {
            peg$savedPos = s0;
            s1 = peg$c38(s1, s3);
            s0 = s1;
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c37); }
    }

    return s0;
  }

  function peg$parseChoices() {
    var s0, s1, s2;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = [];
    s2 = peg$parseChoice();
    if (s2 !== peg$FAILED) {
      while (s2 !== peg$FAILED) {
        s1.push(s2);
        s2 = peg$parseChoice();
      }
    } else {
      s1 = peg$FAILED;
    }
    if (s1 !== peg$FAILED) {
      peg$savedPos = s0;
      s1 = peg$c40(s1);
    }
    s0 = s1;
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c39); }
    }

    return s0;
  }

  function peg$parseChoice() {
    var s0, s1, s2, s3, s4, s5, s6, s7;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parse_();
    if (s1 !== peg$FAILED) {
      s2 = peg$currPos;
      if (peg$c42.test(input.charAt(peg$currPos))) {
        s3 = input.charAt(peg$currPos);
        peg$currPos++;
      } else {
        s3 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c43); }
      }
      if (s3 !== peg$FAILED) {
        s4 = peg$parse_();
        if (s4 !== peg$FAILED) {
          s5 = peg$parseWeight();
          if (s5 === peg$FAILED) {
            s5 = null;
          }
          if (s5 !== peg$FAILED) {
            s6 = peg$parse_();
            if (s6 !== peg$FAILED) {
              s7 = peg$parseRichText();
              if (s7 !== peg$FAILED) {
                s3 = [s3, s4, s5, s6, s7];
                s2 = s3;
              } else {
                peg$currPos = s2;
                s2 = peg$FAILED;
              }
            } else {
              peg$currPos = s2;
              s2 = peg$FAILED;
            }
          } else {
            peg$currPos = s2;
            s2 = peg$FAILED;
          }
        } else {
          peg$currPos = s2;
          s2 = peg$FAILED;
        }
      } else {
        peg$currPos = s2;
        s2 = peg$FAILED;
      }
      if (s2 !== peg$FAILED) {
        s3 = peg$parseFeedback();
        if (s3 === peg$FAILED) {
          s3 = null;
        }
        if (s3 !== peg$FAILED) {
          s4 = peg$parse_();
          if (s4 !== peg$FAILED) {
            peg$savedPos = s0;
            s1 = peg$c44(s2, s3);
            s0 = s1;
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c41); }
    }

    return s0;
  }

  function peg$parseWeight() {
    var s0, s1, s2, s3;

    peg$silentFails++;
    s0 = peg$currPos;
    if (input.charCodeAt(peg$currPos) === 37) {
      s1 = peg$c46;
      peg$currPos++;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c47); }
    }
    if (s1 !== peg$FAILED) {
      s2 = peg$parsePercentValue();
      if (s2 !== peg$FAILED) {
        if (input.charCodeAt(peg$currPos) === 37) {
          s3 = peg$c46;
          peg$currPos++;
        } else {
          s3 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$c47); }
        }
        if (s3 !== peg$FAILED) {
          peg$savedPos = s0;
          s1 = peg$c48(s2);
          s0 = s1;
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c45); }
    }

    return s0;
  }

  function peg$parsePercentValue() {
    var s0, s1, s2, s3, s4;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = [];
    s2 = peg$currPos;
    s3 = peg$currPos;
    peg$silentFails++;
    if (input.charCodeAt(peg$currPos) === 37) {
      s4 = peg$c46;
      peg$currPos++;
    } else {
      s4 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c47); }
    }
    peg$silentFails--;
    if (s4 === peg$FAILED) {
      s3 = void 0;
    } else {
      peg$currPos = s3;
      s3 = peg$FAILED;
    }
    if (s3 !== peg$FAILED) {
      if (input.length > peg$currPos) {
        s4 = input.charAt(peg$currPos);
        peg$currPos++;
      } else {
        s4 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c50); }
      }
      if (s4 !== peg$FAILED) {
        s3 = [s3, s4];
        s2 = s3;
      } else {
        peg$currPos = s2;
        s2 = peg$FAILED;
      }
    } else {
      peg$currPos = s2;
      s2 = peg$FAILED;
    }
    while (s2 !== peg$FAILED) {
      s1.push(s2);
      s2 = peg$currPos;
      s3 = peg$currPos;
      peg$silentFails++;
      if (input.charCodeAt(peg$currPos) === 37) {
        s4 = peg$c46;
        peg$currPos++;
      } else {
        s4 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c47); }
      }
      peg$silentFails--;
      if (s4 === peg$FAILED) {
        s3 = void 0;
      } else {
        peg$currPos = s3;
        s3 = peg$FAILED;
      }
      if (s3 !== peg$FAILED) {
        if (input.length > peg$currPos) {
          s4 = input.charAt(peg$currPos);
          peg$currPos++;
        } else {
          s4 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$c50); }
        }
        if (s4 !== peg$FAILED) {
          s3 = [s3, s4];
          s2 = s3;
        } else {
          peg$currPos = s2;
          s2 = peg$FAILED;
        }
      } else {
        peg$currPos = s2;
        s2 = peg$FAILED;
      }
    }
    if (s1 !== peg$FAILED) {
      peg$savedPos = s0;
      s1 = peg$c51(s1);
    }
    s0 = s1;
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c49); }
    }

    return s0;
  }

  function peg$parseFeedback() {
    var s0, s1, s2, s3, s4;

    peg$silentFails++;
    s0 = peg$currPos;
    if (input.charCodeAt(peg$currPos) === 35) {
      s1 = peg$c53;
      peg$currPos++;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c54); }
    }
    if (s1 !== peg$FAILED) {
      s2 = peg$currPos;
      peg$silentFails++;
      if (input.substr(peg$currPos, 3) === peg$c55) {
        s3 = peg$c55;
        peg$currPos += 3;
      } else {
        s3 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c56); }
      }
      peg$silentFails--;
      if (s3 === peg$FAILED) {
        s2 = void 0;
      } else {
        peg$currPos = s2;
        s2 = peg$FAILED;
      }
      if (s2 !== peg$FAILED) {
        s3 = peg$parse_();
        if (s3 !== peg$FAILED) {
          s4 = peg$parseRichText();
          if (s4 === peg$FAILED) {
            s4 = null;
          }
          if (s4 !== peg$FAILED) {
            peg$savedPos = s0;
            s1 = peg$c57(s4);
            s0 = s1;
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c52); }
    }

    return s0;
  }

  function peg$parseEssayAnswer() {
    var s0, s1, s2, s3, s4;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$c59;
    if (s1 !== peg$FAILED) {
      s2 = peg$parse_();
      if (s2 !== peg$FAILED) {
        s3 = peg$parseGlobalFeedback();
        if (s3 === peg$FAILED) {
          s3 = null;
        }
        if (s3 !== peg$FAILED) {
          s4 = peg$parse_();
          if (s4 !== peg$FAILED) {
            peg$savedPos = s0;
            s1 = peg$c60(s3);
            s0 = s1;
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c58); }
    }

    return s0;
  }

  function peg$parseSingleCorrectShortAnswer() {
    var s0, s1, s2, s3, s4, s5, s6;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parseRichText();
    if (s1 !== peg$FAILED) {
      s2 = peg$parse_();
      if (s2 !== peg$FAILED) {
        s3 = peg$parseFeedback();
        if (s3 === peg$FAILED) {
          s3 = null;
        }
        if (s3 !== peg$FAILED) {
          s4 = peg$parse_();
          if (s4 !== peg$FAILED) {
            s5 = peg$parseGlobalFeedback();
            if (s5 === peg$FAILED) {
              s5 = null;
            }
            if (s5 !== peg$FAILED) {
              s6 = peg$parse_();
              if (s6 !== peg$FAILED) {
                peg$savedPos = s0;
                s1 = peg$c62(s1, s3, s5);
                s0 = s1;
              } else {
                peg$currPos = s0;
                s0 = peg$FAILED;
              }
            } else {
              peg$currPos = s0;
              s0 = peg$FAILED;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c61); }
    }

    return s0;
  }

  function peg$parseNumericalAnswerType() {
    var s0, s1, s2, s3, s4, s5;

    peg$silentFails++;
    s0 = peg$currPos;
    if (input.charCodeAt(peg$currPos) === 35) {
      s1 = peg$c53;
      peg$currPos++;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c54); }
    }
    if (s1 !== peg$FAILED) {
      s2 = peg$parse_();
      if (s2 !== peg$FAILED) {
        s3 = peg$parseNumericalAnswers();
        if (s3 !== peg$FAILED) {
          s4 = peg$parse_();
          if (s4 !== peg$FAILED) {
            s5 = peg$parseGlobalFeedback();
            if (s5 === peg$FAILED) {
              s5 = null;
            }
            if (s5 !== peg$FAILED) {
              peg$savedPos = s0;
              s1 = peg$c64(s3, s5);
              s0 = s1;
            } else {
              peg$currPos = s0;
              s0 = peg$FAILED;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c63); }
    }

    return s0;
  }

  function peg$parseNumericalAnswers() {
    var s0, s1;

    peg$silentFails++;
    s0 = peg$parseMultipleNumericalChoices();
    if (s0 === peg$FAILED) {
      s0 = peg$parseSingleNumericalAnswer();
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c65); }
    }

    return s0;
  }

  function peg$parseMultipleNumericalChoices() {
    var s0, s1, s2;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = [];
    s2 = peg$parseNumericalChoice();
    if (s2 !== peg$FAILED) {
      while (s2 !== peg$FAILED) {
        s1.push(s2);
        s2 = peg$parseNumericalChoice();
      }
    } else {
      s1 = peg$FAILED;
    }
    if (s1 !== peg$FAILED) {
      peg$savedPos = s0;
      s1 = peg$c40(s1);
    }
    s0 = s1;
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c66); }
    }

    return s0;
  }

  function peg$parseNumericalChoice() {
    var s0, s1, s2, s3, s4, s5;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parse_();
    if (s1 !== peg$FAILED) {
      s2 = peg$currPos;
      if (peg$c42.test(input.charAt(peg$currPos))) {
        s3 = input.charAt(peg$currPos);
        peg$currPos++;
      } else {
        s3 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c43); }
      }
      if (s3 !== peg$FAILED) {
        s4 = peg$parseWeight();
        if (s4 === peg$FAILED) {
          s4 = null;
        }
        if (s4 !== peg$FAILED) {
          s5 = peg$parseSingleNumericalAnswer();
          if (s5 === peg$FAILED) {
            s5 = null;
          }
          if (s5 !== peg$FAILED) {
            s3 = [s3, s4, s5];
            s2 = s3;
          } else {
            peg$currPos = s2;
            s2 = peg$FAILED;
          }
        } else {
          peg$currPos = s2;
          s2 = peg$FAILED;
        }
      } else {
        peg$currPos = s2;
        s2 = peg$FAILED;
      }
      if (s2 !== peg$FAILED) {
        s3 = peg$parse_();
        if (s3 !== peg$FAILED) {
          s4 = peg$parseFeedback();
          if (s4 === peg$FAILED) {
            s4 = null;
          }
          if (s4 !== peg$FAILED) {
            s5 = peg$parse_();
            if (s5 !== peg$FAILED) {
              peg$savedPos = s0;
              s1 = peg$c68(s2, s4);
              s0 = s1;
            } else {
              peg$currPos = s0;
              s0 = peg$FAILED;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c67); }
    }

    return s0;
  }

  function peg$parseSingleNumericalAnswer() {
    var s0, s1;

    peg$silentFails++;
    s0 = peg$parseNumberWithRange();
    if (s0 === peg$FAILED) {
      s0 = peg$parseNumberHighLow();
      if (s0 === peg$FAILED) {
        s0 = peg$parseNumberAlone();
      }
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c69); }
    }

    return s0;
  }

  function peg$parseNumberWithRange() {
    var s0, s1, s2, s3;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parseNumber();
    if (s1 !== peg$FAILED) {
      if (input.charCodeAt(peg$currPos) === 58) {
        s2 = peg$c71;
        peg$currPos++;
      } else {
        s2 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c72); }
      }
      if (s2 !== peg$FAILED) {
        s3 = peg$parseNumber();
        if (s3 !== peg$FAILED) {
          peg$savedPos = s0;
          s1 = peg$c73(s1, s3);
          s0 = s1;
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c70); }
    }

    return s0;
  }

  function peg$parseNumberHighLow() {
    var s0, s1, s2, s3;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parseNumber();
    if (s1 !== peg$FAILED) {
      if (input.substr(peg$currPos, 2) === peg$c75) {
        s2 = peg$c75;
        peg$currPos += 2;
      } else {
        s2 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c76); }
      }
      if (s2 !== peg$FAILED) {
        s3 = peg$parseNumber();
        if (s3 !== peg$FAILED) {
          peg$savedPos = s0;
          s1 = peg$c77(s1, s3);
          s0 = s1;
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c74); }
    }

    return s0;
  }

  function peg$parseNumberAlone() {
    var s0, s1;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parseNumber();
    if (s1 !== peg$FAILED) {
      peg$savedPos = s0;
      s1 = peg$c79(s1);
    }
    s0 = s1;
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c78); }
    }

    return s0;
  }

  function peg$parseQuestionTitle() {
    var s0, s1, s2, s3;

    peg$silentFails++;
    s0 = peg$currPos;
    if (input.substr(peg$currPos, 2) === peg$c81) {
      s1 = peg$c81;
      peg$currPos += 2;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c82); }
    }
    if (s1 !== peg$FAILED) {
      s2 = [];
      s3 = peg$parseTitleText();
      if (s3 !== peg$FAILED) {
        while (s3 !== peg$FAILED) {
          s2.push(s3);
          s3 = peg$parseTitleText();
        }
      } else {
        s2 = peg$FAILED;
      }
      if (s2 !== peg$FAILED) {
        if (input.substr(peg$currPos, 2) === peg$c81) {
          s3 = peg$c81;
          peg$currPos += 2;
        } else {
          s3 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$c82); }
        }
        if (s3 !== peg$FAILED) {
          peg$savedPos = s0;
          s1 = peg$c83(s2);
          s0 = s1;
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c80); }
    }

    return s0;
  }

  function peg$parseQuestionStem() {
    var s0, s1;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parseRichText();
    if (s1 !== peg$FAILED) {
      peg$savedPos = s0;
      s1 = peg$c85(s1);
    }
    s0 = s1;
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c84); }
    }

    return s0;
  }

  function peg$parseQuestionSeparator() {
    var s0, s1, s2;

    peg$silentFails++;
    s0 = peg$parseBlankLines();
    if (s0 === peg$FAILED) {
      s0 = peg$currPos;
      s1 = peg$parseEndOfLine();
      if (s1 === peg$FAILED) {
        s1 = null;
      }
      if (s1 !== peg$FAILED) {
        s2 = peg$parseEndOfFile();
        if (s2 !== peg$FAILED) {
          s1 = [s1, s2];
          s0 = s1;
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c86); }
    }

    return s0;
  }

  function peg$parseBlankLines() {
    var s0, s1, s2, s3;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parseEndOfLine();
    if (s1 !== peg$FAILED) {
      s2 = [];
      s3 = peg$parseBlankLine();
      if (s3 !== peg$FAILED) {
        while (s3 !== peg$FAILED) {
          s2.push(s3);
          s3 = peg$parseBlankLine();
        }
      } else {
        s2 = peg$FAILED;
      }
      if (s2 !== peg$FAILED) {
        s1 = [s1, s2];
        s0 = s1;
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c87); }
    }

    return s0;
  }

  function peg$parseBlankLine() {
    var s0, s1, s2;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = [];
    s2 = peg$parseSpace();
    while (s2 !== peg$FAILED) {
      s1.push(s2);
      s2 = peg$parseSpace();
    }
    if (s1 !== peg$FAILED) {
      s2 = peg$parseEndOfLine();
      if (s2 !== peg$FAILED) {
        s1 = [s1, s2];
        s0 = s1;
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c88); }
    }

    return s0;
  }

  function peg$parseTitleText() {
    var s0, s1, s2;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$currPos;
    peg$silentFails++;
    if (input.substr(peg$currPos, 2) === peg$c81) {
      s2 = peg$c81;
      peg$currPos += 2;
    } else {
      s2 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c82); }
    }
    peg$silentFails--;
    if (s2 === peg$FAILED) {
      s1 = void 0;
    } else {
      peg$currPos = s1;
      s1 = peg$FAILED;
    }
    if (s1 !== peg$FAILED) {
      s2 = peg$parseEscapeSequence();
      if (s2 === peg$FAILED) {
        s2 = peg$parseUnescapedChar();
      }
      if (s2 !== peg$FAILED) {
        peg$savedPos = s0;
        s1 = peg$c90(s2);
        s0 = s1;
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c89); }
    }

    return s0;
  }

  function peg$parseTextChar() {
    var s0, s1;

    peg$silentFails++;
    s0 = peg$parseUnescapedChar();
    if (s0 === peg$FAILED) {
      s0 = peg$parseEscapeSequence();
      if (s0 === peg$FAILED) {
        s0 = peg$parseEscapeChar();
      }
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c91); }
    }

    return s0;
  }

  function peg$parseMatchTextChar() {
    var s0, s1;

    peg$silentFails++;
    s0 = peg$parseUnescapedMatchChar();
    if (s0 === peg$FAILED) {
      s0 = peg$parseEscapeSequence();
      if (s0 === peg$FAILED) {
        s0 = peg$parseEscapeChar();
      }
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c91); }
    }

    return s0;
  }

  function peg$parseFormat() {
    var s0, s1, s2, s3;

    peg$silentFails++;
    s0 = peg$currPos;
    if (input.charCodeAt(peg$currPos) === 91) {
      s1 = peg$c93;
      peg$currPos++;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c94); }
    }
    if (s1 !== peg$FAILED) {
      if (input.substr(peg$currPos, 4) === peg$c95) {
        s2 = peg$c95;
        peg$currPos += 4;
      } else {
        s2 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c96); }
      }
      if (s2 === peg$FAILED) {
        if (input.substr(peg$currPos, 8) === peg$c97) {
          s2 = peg$c97;
          peg$currPos += 8;
        } else {
          s2 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$c98); }
        }
        if (s2 === peg$FAILED) {
          if (input.substr(peg$currPos, 5) === peg$c99) {
            s2 = peg$c99;
            peg$currPos += 5;
          } else {
            s2 = peg$FAILED;
            if (peg$silentFails === 0) { peg$fail(peg$c100); }
          }
          if (s2 === peg$FAILED) {
            if (input.substr(peg$currPos, 6) === peg$c101) {
              s2 = peg$c101;
              peg$currPos += 6;
            } else {
              s2 = peg$FAILED;
              if (peg$silentFails === 0) { peg$fail(peg$c102); }
            }
          }
        }
      }
      if (s2 !== peg$FAILED) {
        if (input.charCodeAt(peg$currPos) === 93) {
          s3 = peg$c103;
          peg$currPos++;
        } else {
          s3 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$c104); }
        }
        if (s3 !== peg$FAILED) {
          peg$savedPos = s0;
          s1 = peg$c105(s2);
          s0 = s1;
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c92); }
    }

    return s0;
  }

  function peg$parseEscapeChar() {
    var s0, s1;

    peg$silentFails++;
    if (input.charCodeAt(peg$currPos) === 92) {
      s0 = peg$c107;
      peg$currPos++;
    } else {
      s0 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c108); }
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c106); }
    }

    return s0;
  }

  function peg$parseEscapeSequence() {
    var s0, s1, s2;

    peg$silentFails++;
    s0 = peg$currPos;
    if (input.charCodeAt(peg$currPos) === 92) {
      s1 = peg$c107;
      peg$currPos++;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c108); }
    }
    if (s1 !== peg$FAILED) {
      if (input.charCodeAt(peg$currPos) === 92) {
        s2 = peg$c107;
        peg$currPos++;
      } else {
        s2 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c108); }
      }
      if (s2 === peg$FAILED) {
        if (input.charCodeAt(peg$currPos) === 58) {
          s2 = peg$c71;
          peg$currPos++;
        } else {
          s2 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$c72); }
        }
        if (s2 === peg$FAILED) {
          if (input.charCodeAt(peg$currPos) === 35) {
            s2 = peg$c53;
            peg$currPos++;
          } else {
            s2 = peg$FAILED;
            if (peg$silentFails === 0) { peg$fail(peg$c54); }
          }
          if (s2 === peg$FAILED) {
            if (input.charCodeAt(peg$currPos) === 61) {
              s2 = peg$c19;
              peg$currPos++;
            } else {
              s2 = peg$FAILED;
              if (peg$silentFails === 0) { peg$fail(peg$c20); }
            }
            if (s2 === peg$FAILED) {
              if (input.charCodeAt(peg$currPos) === 123) {
                s2 = peg$c9;
                peg$currPos++;
              } else {
                s2 = peg$FAILED;
                if (peg$silentFails === 0) { peg$fail(peg$c10); }
              }
              if (s2 === peg$FAILED) {
                if (input.charCodeAt(peg$currPos) === 125) {
                  s2 = peg$c11;
                  peg$currPos++;
                } else {
                  s2 = peg$FAILED;
                  if (peg$silentFails === 0) { peg$fail(peg$c12); }
                }
                if (s2 === peg$FAILED) {
                  if (input.charCodeAt(peg$currPos) === 126) {
                    s2 = peg$c110;
                    peg$currPos++;
                  } else {
                    s2 = peg$FAILED;
                    if (peg$silentFails === 0) { peg$fail(peg$c111); }
                  }
                  if (s2 === peg$FAILED) {
                    if (input.charCodeAt(peg$currPos) === 110) {
                      s2 = peg$c112;
                      peg$currPos++;
                    } else {
                      s2 = peg$FAILED;
                      if (peg$silentFails === 0) { peg$fail(peg$c113); }
                    }
                  }
                }
              }
            }
          }
        }
      }
      if (s2 !== peg$FAILED) {
        peg$savedPos = s0;
        s1 = peg$c114(s2);
        s0 = s1;
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c109); }
    }

    return s0;
  }

  function peg$parseUnescapedChar() {
    var s0, s1, s2;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$currPos;
    peg$silentFails++;
    s2 = peg$parseEscapeSequence();
    if (s2 === peg$FAILED) {
      s2 = peg$parseControlChar();
      if (s2 === peg$FAILED) {
        s2 = peg$parseQuestionSeparator();
      }
    }
    peg$silentFails--;
    if (s2 === peg$FAILED) {
      s1 = void 0;
    } else {
      peg$currPos = s1;
      s1 = peg$FAILED;
    }
    if (s1 !== peg$FAILED) {
      if (input.length > peg$currPos) {
        s2 = input.charAt(peg$currPos);
        peg$currPos++;
      } else {
        s2 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c50); }
      }
      if (s2 !== peg$FAILED) {
        peg$savedPos = s0;
        s1 = peg$c116();
        s0 = s1;
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c115); }
    }

    return s0;
  }

  function peg$parseUnescapedMatchChar() {
    var s0, s1, s2;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$currPos;
    peg$silentFails++;
    s2 = peg$parseEscapeSequence();
    if (s2 === peg$FAILED) {
      s2 = peg$parseControlChar();
      if (s2 === peg$FAILED) {
        if (input.substr(peg$currPos, 2) === peg$c21) {
          s2 = peg$c21;
          peg$currPos += 2;
        } else {
          s2 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$c22); }
        }
        if (s2 === peg$FAILED) {
          s2 = peg$parseQuestionSeparator();
        }
      }
    }
    peg$silentFails--;
    if (s2 === peg$FAILED) {
      s1 = void 0;
    } else {
      peg$currPos = s1;
      s1 = peg$FAILED;
    }
    if (s1 !== peg$FAILED) {
      if (input.length > peg$currPos) {
        s2 = input.charAt(peg$currPos);
        peg$currPos++;
      } else {
        s2 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c50); }
      }
      if (s2 !== peg$FAILED) {
        peg$savedPos = s0;
        s1 = peg$c116();
        s0 = s1;
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c115); }
    }

    return s0;
  }

  function peg$parseControlChar() {
    var s0;

    if (input.charCodeAt(peg$currPos) === 61) {
      s0 = peg$c19;
      peg$currPos++;
    } else {
      s0 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c20); }
    }
    if (s0 === peg$FAILED) {
      if (input.charCodeAt(peg$currPos) === 126) {
        s0 = peg$c110;
        peg$currPos++;
      } else {
        s0 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c111); }
      }
      if (s0 === peg$FAILED) {
        if (input.charCodeAt(peg$currPos) === 35) {
          s0 = peg$c53;
          peg$currPos++;
        } else {
          s0 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$c54); }
        }
        if (s0 === peg$FAILED) {
          if (input.charCodeAt(peg$currPos) === 123) {
            s0 = peg$c9;
            peg$currPos++;
          } else {
            s0 = peg$FAILED;
            if (peg$silentFails === 0) { peg$fail(peg$c10); }
          }
          if (s0 === peg$FAILED) {
            if (input.charCodeAt(peg$currPos) === 125) {
              s0 = peg$c11;
              peg$currPos++;
            } else {
              s0 = peg$FAILED;
              if (peg$silentFails === 0) { peg$fail(peg$c12); }
            }
            if (s0 === peg$FAILED) {
              if (input.charCodeAt(peg$currPos) === 92) {
                s0 = peg$c107;
                peg$currPos++;
              } else {
                s0 = peg$FAILED;
                if (peg$silentFails === 0) { peg$fail(peg$c108); }
              }
              if (s0 === peg$FAILED) {
                if (input.charCodeAt(peg$currPos) === 58) {
                  s0 = peg$c71;
                  peg$currPos++;
                } else {
                  s0 = peg$FAILED;
                  if (peg$silentFails === 0) { peg$fail(peg$c72); }
                }
              }
            }
          }
        }
      }
    }

    return s0;
  }

  function peg$parseMatchRichText() {
    var s0, s1, s2, s3, s4;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parseFormat();
    if (s1 === peg$FAILED) {
      s1 = null;
    }
    if (s1 !== peg$FAILED) {
      s2 = peg$parse_();
      if (s2 !== peg$FAILED) {
        s3 = [];
        s4 = peg$parseMatchTextChar();
        if (s4 !== peg$FAILED) {
          while (s4 !== peg$FAILED) {
            s3.push(s4);
            s4 = peg$parseMatchTextChar();
          }
        } else {
          s3 = peg$FAILED;
        }
        if (s3 !== peg$FAILED) {
          peg$savedPos = s0;
          s1 = peg$c118(s1, s3);
          s0 = s1;
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c117); }
    }

    return s0;
  }

  function peg$parseRichText() {
    var s0, s1, s2, s3, s4;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = peg$parseFormat();
    if (s1 === peg$FAILED) {
      s1 = null;
    }
    if (s1 !== peg$FAILED) {
      s2 = peg$parse_();
      if (s2 !== peg$FAILED) {
        s3 = [];
        s4 = peg$parseTextChar();
        if (s4 !== peg$FAILED) {
          while (s4 !== peg$FAILED) {
            s3.push(s4);
            s4 = peg$parseTextChar();
          }
        } else {
          s3 = peg$FAILED;
        }
        if (s3 !== peg$FAILED) {
          peg$savedPos = s0;
          s1 = peg$c118(s1, s3);
          s0 = s1;
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c119); }
    }

    return s0;
  }

  function peg$parsePlainText() {
    var s0, s1, s2;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = [];
    s2 = peg$parseTextChar();
    if (s2 !== peg$FAILED) {
      while (s2 !== peg$FAILED) {
        s1.push(s2);
        s2 = peg$parseTextChar();
      }
    } else {
      s1 = peg$FAILED;
    }
    if (s1 !== peg$FAILED) {
      peg$savedPos = s0;
      s1 = peg$c121(s1);
    }
    s0 = s1;
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c120); }
    }

    return s0;
  }

  function peg$parseCategoryText() {
    var s0, s1, s2, s3, s4;

    peg$silentFails++;
    s0 = peg$currPos;
    s1 = [];
    s2 = peg$currPos;
    s3 = peg$currPos;
    peg$silentFails++;
    s4 = peg$parseEndOfLine();
    peg$silentFails--;
    if (s4 === peg$FAILED) {
      s3 = void 0;
    } else {
      peg$currPos = s3;
      s3 = peg$FAILED;
    }
    if (s3 !== peg$FAILED) {
      if (input.length > peg$currPos) {
        s4 = input.charAt(peg$currPos);
        peg$currPos++;
      } else {
        s4 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c50); }
      }
      if (s4 !== peg$FAILED) {
        s3 = [s3, s4];
        s2 = s3;
      } else {
        peg$currPos = s2;
        s2 = peg$FAILED;
      }
    } else {
      peg$currPos = s2;
      s2 = peg$FAILED;
    }
    while (s2 !== peg$FAILED) {
      s1.push(s2);
      s2 = peg$currPos;
      s3 = peg$currPos;
      peg$silentFails++;
      s4 = peg$parseEndOfLine();
      peg$silentFails--;
      if (s4 === peg$FAILED) {
        s3 = void 0;
      } else {
        peg$currPos = s3;
        s3 = peg$FAILED;
      }
      if (s3 !== peg$FAILED) {
        if (input.length > peg$currPos) {
          s4 = input.charAt(peg$currPos);
          peg$currPos++;
        } else {
          s4 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$c50); }
        }
        if (s4 !== peg$FAILED) {
          s3 = [s3, s4];
          s2 = s3;
        } else {
          peg$currPos = s2;
          s2 = peg$FAILED;
        }
      } else {
        peg$currPos = s2;
        s2 = peg$FAILED;
      }
    }
    if (s1 !== peg$FAILED) {
      s2 = peg$currPos;
      peg$silentFails++;
      s3 = peg$parseEndOfLine();
      if (s3 === peg$FAILED) {
        s3 = peg$parseEndOfFile();
      }
      peg$silentFails--;
      if (s3 !== peg$FAILED) {
        peg$currPos = s2;
        s2 = void 0;
      } else {
        s2 = peg$FAILED;
      }
      if (s2 !== peg$FAILED) {
        peg$savedPos = s0;
        s1 = peg$c123(s1);
        s0 = s1;
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c122); }
    }

    return s0;
  }

  function peg$parseNumber() {
    var s0, s1, s2;

    s0 = peg$currPos;
    s1 = peg$parseSign();
    if (s1 === peg$FAILED) {
      s1 = null;
    }
    if (s1 !== peg$FAILED) {
      s2 = peg$parseDecimalValue();
      if (s2 !== peg$FAILED) {
        peg$savedPos = s0;
        s1 = peg$c124();
        s0 = s1;
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parseDecimalValue() {
    var s0, s1, s2, s3, s4;

    s0 = peg$currPos;
    s1 = peg$parseDigits();
    if (s1 !== peg$FAILED) {
      s2 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 46) {
        s3 = peg$c125;
        peg$currPos++;
      } else {
        s3 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c126); }
      }
      if (s3 !== peg$FAILED) {
        s4 = peg$parseDigits();
        if (s4 !== peg$FAILED) {
          s3 = [s3, s4];
          s2 = s3;
        } else {
          peg$currPos = s2;
          s2 = peg$FAILED;
        }
      } else {
        peg$currPos = s2;
        s2 = peg$FAILED;
      }
      if (s2 === peg$FAILED) {
        s2 = null;
      }
      if (s2 !== peg$FAILED) {
        s1 = [s1, s2];
        s0 = s1;
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parseDigits() {
    var s0, s1;

    s0 = [];
    if (peg$c127.test(input.charAt(peg$currPos))) {
      s1 = input.charAt(peg$currPos);
      peg$currPos++;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c128); }
    }
    if (s1 !== peg$FAILED) {
      while (s1 !== peg$FAILED) {
        s0.push(s1);
        if (peg$c127.test(input.charAt(peg$currPos))) {
          s1 = input.charAt(peg$currPos);
          peg$currPos++;
        } else {
          s1 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$c128); }
        }
      }
    } else {
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parseSign() {
    var s0;

    if (peg$c129.test(input.charAt(peg$currPos))) {
      s0 = input.charAt(peg$currPos);
      peg$currPos++;
    } else {
      s0 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c130); }
    }

    return s0;
  }

  function peg$parseGlobalFeedback() {
    var s0, s1, s2, s3, s4;

    s0 = peg$currPos;
    if (input.substr(peg$currPos, 4) === peg$c131) {
      s1 = peg$c131;
      peg$currPos += 4;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c132); }
    }
    if (s1 !== peg$FAILED) {
      s2 = peg$parse_();
      if (s2 !== peg$FAILED) {
        s3 = peg$parseRichText();
        if (s3 !== peg$FAILED) {
          s4 = peg$parse_();
          if (s4 !== peg$FAILED) {
            peg$savedPos = s0;
            s1 = peg$c133(s3);
            s0 = s1;
          } else {
            peg$currPos = s0;
            s0 = peg$FAILED;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$FAILED;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }

    return s0;
  }

  function peg$parse_() {
    var s0, s1, s2, s3, s4;

    peg$silentFails++;
    s0 = [];
    s1 = peg$parseSpace();
    if (s1 === peg$FAILED) {
      s1 = peg$currPos;
      s2 = peg$parseEndOfLine();
      if (s2 !== peg$FAILED) {
        s3 = peg$currPos;
        peg$silentFails++;
        s4 = peg$parseBlankLine();
        peg$silentFails--;
        if (s4 === peg$FAILED) {
          s3 = void 0;
        } else {
          peg$currPos = s3;
          s3 = peg$FAILED;
        }
        if (s3 !== peg$FAILED) {
          s2 = [s2, s3];
          s1 = s2;
        } else {
          peg$currPos = s1;
          s1 = peg$FAILED;
        }
      } else {
        peg$currPos = s1;
        s1 = peg$FAILED;
      }
    }
    while (s1 !== peg$FAILED) {
      s0.push(s1);
      s1 = peg$parseSpace();
      if (s1 === peg$FAILED) {
        s1 = peg$currPos;
        s2 = peg$parseEndOfLine();
        if (s2 !== peg$FAILED) {
          s3 = peg$currPos;
          peg$silentFails++;
          s4 = peg$parseBlankLine();
          peg$silentFails--;
          if (s4 === peg$FAILED) {
            s3 = void 0;
          } else {
            peg$currPos = s3;
            s3 = peg$FAILED;
          }
          if (s3 !== peg$FAILED) {
            s2 = [s2, s3];
            s1 = s2;
          } else {
            peg$currPos = s1;
            s1 = peg$FAILED;
          }
        } else {
          peg$currPos = s1;
          s1 = peg$FAILED;
        }
      }
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c134); }
    }

    return s0;
  }

  function peg$parse__() {
    var s0, s1;

    peg$silentFails++;
    s0 = [];
    s1 = peg$parseTagComment();
    if (s1 === peg$FAILED) {
      s1 = peg$parseEndOfLine();
      if (s1 === peg$FAILED) {
        s1 = peg$parseSpace();
      }
    }
    while (s1 !== peg$FAILED) {
      s0.push(s1);
      s1 = peg$parseTagComment();
      if (s1 === peg$FAILED) {
        s1 = peg$parseEndOfLine();
        if (s1 === peg$FAILED) {
          s1 = peg$parseSpace();
        }
      }
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c135); }
    }

    return s0;
  }

  function peg$parseResetIdsTags() {
    var s0, s1, s2, s3;

    s0 = peg$currPos;
    s1 = peg$currPos;
    peg$silentFails++;
    s2 = [];
    if (input.charCodeAt(peg$currPos) === 32) {
      s3 = peg$c136;
      peg$currPos++;
    } else {
      s3 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c137); }
    }
    while (s3 !== peg$FAILED) {
      s2.push(s3);
      if (input.charCodeAt(peg$currPos) === 32) {
        s3 = peg$c136;
        peg$currPos++;
      } else {
        s3 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c137); }
      }
    }
    peg$silentFails--;
    if (s2 !== peg$FAILED) {
      peg$currPos = s1;
      s1 = void 0;
    } else {
      s1 = peg$FAILED;
    }
    if (s1 !== peg$FAILED) {
      peg$savedPos = s0;
      s1 = peg$c138();
    }
    s0 = s1;

    return s0;
  }

  function peg$parseComment() {
    var s0, s1, s2, s3;

    peg$silentFails++;
    s0 = peg$currPos;
    if (input.substr(peg$currPos, 2) === peg$c140) {
      s1 = peg$c140;
      peg$currPos += 2;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c141); }
    }
    if (s1 !== peg$FAILED) {
      s2 = [];
      if (peg$c142.test(input.charAt(peg$currPos))) {
        s3 = input.charAt(peg$currPos);
        peg$currPos++;
      } else {
        s3 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c143); }
      }
      while (s3 !== peg$FAILED) {
        s2.push(s3);
        if (peg$c142.test(input.charAt(peg$currPos))) {
          s3 = input.charAt(peg$currPos);
          peg$currPos++;
        } else {
          s3 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$c143); }
        }
      }
      if (s2 !== peg$FAILED) {
        peg$savedPos = s0;
        s1 = peg$c144(s2);
        s0 = s1;
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c139); }
    }

    return s0;
  }

  function peg$parseTagComment() {
    var s0, s1, s2, s3;

    peg$silentFails++;
    s0 = peg$currPos;
    if (input.substr(peg$currPos, 2) === peg$c140) {
      s1 = peg$c140;
      peg$currPos += 2;
    } else {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c141); }
    }
    if (s1 !== peg$FAILED) {
      s2 = [];
      if (peg$c142.test(input.charAt(peg$currPos))) {
        s3 = input.charAt(peg$currPos);
        peg$currPos++;
      } else {
        s3 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c143); }
      }
      while (s3 !== peg$FAILED) {
        s2.push(s3);
        if (peg$c142.test(input.charAt(peg$currPos))) {
          s3 = input.charAt(peg$currPos);
          peg$currPos++;
        } else {
          s3 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$c143); }
        }
      }
      if (s2 !== peg$FAILED) {
        peg$savedPos = s0;
        s1 = peg$c145(s2);
        s0 = s1;
      } else {
        peg$currPos = s0;
        s0 = peg$FAILED;
      }
    } else {
      peg$currPos = s0;
      s0 = peg$FAILED;
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c139); }
    }

    return s0;
  }

  function peg$parseSpace() {
    var s0, s1;

    peg$silentFails++;
    if (input.charCodeAt(peg$currPos) === 32) {
      s0 = peg$c136;
      peg$currPos++;
    } else {
      s0 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c137); }
    }
    if (s0 === peg$FAILED) {
      if (input.charCodeAt(peg$currPos) === 9) {
        s0 = peg$c147;
        peg$currPos++;
      } else {
        s0 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c148); }
      }
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c146); }
    }

    return s0;
  }

  function peg$parseEndOfLine() {
    var s0, s1;

    peg$silentFails++;
    if (input.substr(peg$currPos, 2) === peg$c150) {
      s0 = peg$c150;
      peg$currPos += 2;
    } else {
      s0 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c151); }
    }
    if (s0 === peg$FAILED) {
      if (input.charCodeAt(peg$currPos) === 10) {
        s0 = peg$c152;
        peg$currPos++;
      } else {
        s0 = peg$FAILED;
        if (peg$silentFails === 0) { peg$fail(peg$c153); }
      }
      if (s0 === peg$FAILED) {
        if (input.charCodeAt(peg$currPos) === 13) {
          s0 = peg$c154;
          peg$currPos++;
        } else {
          s0 = peg$FAILED;
          if (peg$silentFails === 0) { peg$fail(peg$c155); }
        }
      }
    }
    peg$silentFails--;
    if (s0 === peg$FAILED) {
      s1 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c149); }
    }

    return s0;
  }

  function peg$parseEndOfFile() {
    var s0, s1, s2;

    s0 = peg$currPos;
    s1 = peg$currPos;
    peg$silentFails++;
    if (input.length > peg$currPos) {
      s2 = input.charAt(peg$currPos);
      peg$currPos++;
    } else {
      s2 = peg$FAILED;
      if (peg$silentFails === 0) { peg$fail(peg$c50); }
    }
    peg$silentFails--;
    if (s2 === peg$FAILED) {
      s1 = void 0;
    } else {
      peg$currPos = s1;
      s1 = peg$FAILED;
    }
    if (s1 !== peg$FAILED) {
      peg$savedPos = s0;
      s1 = peg$c156();
    }
    s0 = s1;

    return s0;
  }


    var questionId = null;
    var questionTags = null;
    var defaultFormat = "moodle"; // default format - the GIFT specs say [moodle] is default, but not sure what that means for other applications
    var format = defaultFormat;
    const escapedCharacters = {
      "\\\\"  : "&&092;",
      "\\:"  : "&&058;",
      "\\#"  : "&&035;",
      "\\="  : "&&061;",
      "\\{"  : "&&123;",
      "\\}"  : "&&125;",
      "\\~"  : "&&126;",
      "\\n"  : "&&010"
    };
    function escapedCharacterDecode(text) {
      // Replace escaped characters with their original values, except for the newline character which should return a real (not escaped newline)
      return text.replace(/&&092;/g, '\\')
                 .replace(/&&058;/g, ':')
                 .replace(/&&035;/g, '#')
                 .replace(/&&061;/g, '=')
                 .replace(/&&123;/g, '{')
                 .replace(/&&125;/g, '}')
                 .replace(/&&126;/g, '~')
                 .replace(/&&010/g, '\n');
    }
    function processAnswers(question, answers) {
      question.globalFeedback = answers.globalFeedback;
      switch(question.type) {
        case "TF":
          question.isTrue = answers.isTrue;
          question.trueFeedback = answers.feedback[0];
          question.falseFeedback = answers.feedback[1];
          break;
        case "MC":
        case "Numerical":
        case "Short":
          question.choices = answers.choices;
          break;
        case "Matching":
          question.matchPairs = answers.matchPairs;
          break;
      }
      // check for MC that's actually a short answer (all correct answers)
      if (question.type == "MC" && areAllCorrect(question.choices)) {
        question.type = "Short";
      }
      question.id = questionId;
      question.tags = questionTags;
      return question;
    }
    function areAllCorrect(choices) {
      var allAreCorrect = true;
      for (var i = 0; i < choices.length; i++) {
        allAreCorrect &= choices[i].isCorrect;
      }
      return allAreCorrect;
    }
    function removeNewLinesDuplicateSpaces(text) {
      text = text.replace(/[\n\r]/g,' '); // replace newlines with spaces
      return text.replace(/\s\s+/g,' ');
    }
    function setLastQuestionTextFormat(fmt) {
      format = fmt;
    }
    function getLastQuestionTextFormat() {
      return format;
    }
    function resetLastQuestionTextFormat() {
      format = defaultFormat;
    }
    function formattedText(format, txt) {
      let inferredFormat = (format !== null ? format : getLastQuestionTextFormat());
      let joinedText = txt.join('')
        .replace(/\r\n/g, '\n')  // replace Windows newlines with Unix newlines
        .trim();
      return {
        format:(inferredFormat), 
        text:(
            ((inferredFormat == "html") || (inferredFormat == "markdown")) ? 
              // keep whitespace and newlines for html and markdown
              escapedCharacterDecode(joinedText) :
              escapedCharacterDecode(removeNewLinesDuplicateSpaces(joinedText))
            )}
    }


  peg$result = peg$startRuleFunction();

  if (peg$result !== peg$FAILED && peg$currPos === input.length) {
    return peg$result;
  } else {
    if (peg$result !== peg$FAILED && peg$currPos < input.length) {
      peg$fail(peg$endExpectation());
    }

    throw peg$buildStructuredError(
      peg$maxFailExpected,
      peg$maxFailPos < input.length ? input.charAt(peg$maxFailPos) : null,
      peg$maxFailPos < input.length
        ? peg$computeLocation(peg$maxFailPos, peg$maxFailPos + 1)
        : peg$computeLocation(peg$maxFailPos, peg$maxFailPos)
    );
  }
}

module.exports = {
  SyntaxError: peg$SyntaxError,
  parse:       peg$parse
};