pegjs/lib/metagrammar.js

PEG.grammarParser = (function(){
  /* Generated by PEG.js (http://pegjs.majda.cz/). */
  
  var result = {
    /*
     * Parses the input with a generated parser. If the parsing is successfull,
     * returns a value explicitly or implicitly specified by the grammar from
     * which the parser was generated (see |PEG.buildParser|). If the parsing is
     * unsuccessful, throws |PEG.grammarParser.SyntaxError| describing the error.
     */
    parse: function(input) {
      var pos = 0;
      var rightmostMatchFailuresPos = 0;
      var rightmostMatchFailuresExpected = [];
      var cache = {};
      
      function quoteString(s) {
        /*
         * ECMA-262, 5th ed., 7.8.4: All characters may appear literally in a
         * string literal except for the closing quote character, backslash,
         * carriage return, line separator, paragraph separator, and line feed.
         * Any character may appear in the form of an escape sequence.
         */
        return '"' + s
          .replace(/\\/g, '\\\\')        // backslash
          .replace(/"/g, '\\"')          // closing quote character
          .replace(/\r/g, '\\r')         // carriage return
          .replace(/\u2028/g, '\\u2028') // line separator
          .replace(/\u2029/g, '\\u2029') // paragraph separator
          .replace(/\n/g, '\\n')         // line feed
          + '"';
      }
      
      function arrayContains(array, value) {
        /*
         * Stupid IE does not have Array.prototype.indexOf, otherwise this
         * function would be a one-liner.
         */
        var length = array.length;
        for (var i = 0; i < length; i++) {
          if (array[i] === value) {
            return true;
          }
        }
        return false;
      }
      
      function matchFailed(failure) {
        if (pos < rightmostMatchFailuresPos) {
          return;
        }
        
        if (pos > rightmostMatchFailuresPos) {
          rightmostMatchFailuresPos = pos;
          rightmostMatchFailuresExpected = [];
        }
        
        if (!arrayContains(rightmostMatchFailuresExpected, failure)) {
          rightmostMatchFailuresExpected.push(failure);
        }
      }
      
      function parse_grammar(context) {
        var cacheKey = "grammar" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos0 = pos;
        var result2 = parse___(context);
        if (result2 !== null) {
          var result4 = parse_rule(context);
          if (result4 !== null) {
            var result3 = [];
            while (result4 !== null) {
              result3.push(result4);
              var result4 = parse_rule(context);
            }
          } else {
            var result3 = null;
          }
          if (result3 !== null) {
            var result1 = [result2, result3];
          } else {
            var result1 = null;
            pos = savedPos0;
          }
        } else {
          var result1 = null;
          pos = savedPos0;
        }
        var result0 = result1 !== null
          ? (function(rules) {
                var result = {};
                PEG.ArrayUtils.each(rules, function(rule) { result[rule.name] = rule; });
                return result;
              })(result1[1])
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result0
        };
        return result0;
      }
      
      function parse_rule(context) {
        var cacheKey = "rule" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos1 = pos;
        var result7 = parse_identifier(context);
        if (result7 !== null) {
          var result14 = parse_literal(context);
          if (result14 !== null) {
            var result8 = result14;
          } else {
            if (input.substr(pos, 0) === "") {
              var result13 = "";
              pos += 0;
            } else {
              var result13 = null;
              if (context.reportMatchFailures) {
                matchFailed(quoteString(""));
              }
            }
            if (result13 !== null) {
              var result8 = result13;
            } else {
              var result8 = null;;
            };
          }
          if (result8 !== null) {
            var result9 = parse_equals(context);
            if (result9 !== null) {
              var result10 = parse_choice(context);
              if (result10 !== null) {
                var result12 = parse_semicolon(context);
                var result11 = result12 !== null ? result12 : '';
                if (result11 !== null) {
                  var result6 = [result7, result8, result9, result10, result11];
                } else {
                  var result6 = null;
                  pos = savedPos1;
                }
              } else {
                var result6 = null;
                pos = savedPos1;
              }
            } else {
              var result6 = null;
              pos = savedPos1;
            }
          } else {
            var result6 = null;
            pos = savedPos1;
          }
        } else {
          var result6 = null;
          pos = savedPos1;
        }
        var result5 = result6 !== null
          ? (function(name, displayName, expression) {
                return {
                  type:        "rule",
                  name:        name,
                  displayName: displayName !== "" ? displayName : null,
                  expression:  expression
                };
              })(result6[0], result6[1], result6[3])
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result5
        };
        return result5;
      }
      
      function parse_choice(context) {
        var cacheKey = "choice" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos2 = pos;
        var result17 = parse_sequence(context);
        if (result17 !== null) {
          var result18 = [];
          var savedPos3 = pos;
          var result20 = parse_slash(context);
          if (result20 !== null) {
            var result21 = parse_sequence(context);
            if (result21 !== null) {
              var result19 = [result20, result21];
            } else {
              var result19 = null;
              pos = savedPos3;
            }
          } else {
            var result19 = null;
            pos = savedPos3;
          }
          while (result19 !== null) {
            result18.push(result19);
            var savedPos3 = pos;
            var result20 = parse_slash(context);
            if (result20 !== null) {
              var result21 = parse_sequence(context);
              if (result21 !== null) {
                var result19 = [result20, result21];
              } else {
                var result19 = null;
                pos = savedPos3;
              }
            } else {
              var result19 = null;
              pos = savedPos3;
            }
          }
          if (result18 !== null) {
            var result16 = [result17, result18];
          } else {
            var result16 = null;
            pos = savedPos2;
          }
        } else {
          var result16 = null;
          pos = savedPos2;
        }
        var result15 = result16 !== null
          ? (function(head, tail) {
                if (tail.length > 0) {
                  var alternatives = [head].concat(PEG.ArrayUtils.map(
                      tail,
                      function(element) { return element[1]; }
                  ));
                  return {
                    type:         "choice",
                    alternatives: alternatives
                  }
                } else {
                  return head;
                }
              })(result16[0], result16[1])
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result15
        };
        return result15;
      }
      
      function parse_sequence(context) {
        var cacheKey = "sequence" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos4 = pos;
        var result28 = [];
        var result30 = parse_labeled(context);
        while (result30 !== null) {
          result28.push(result30);
          var result30 = parse_labeled(context);
        }
        if (result28 !== null) {
          var result29 = parse_action(context);
          if (result29 !== null) {
            var result27 = [result28, result29];
          } else {
            var result27 = null;
            pos = savedPos4;
          }
        } else {
          var result27 = null;
          pos = savedPos4;
        }
        var result26 = result27 !== null
          ? (function(elements, action) {
                var expression = elements.length != 1
                  ? {
                      type:     "sequence",
                      elements: elements
                    }
                  : elements[0];
                return {
                  type:       "action",
                  expression: expression,
                  action:     action
                };
              })(result27[0], result27[1])
          : null;
        if (result26 !== null) {
          var result22 = result26;
        } else {
          var result24 = [];
          var result25 = parse_labeled(context);
          while (result25 !== null) {
            result24.push(result25);
            var result25 = parse_labeled(context);
          }
          var result23 = result24 !== null
            ? (function(elements) {
                  return elements.length != 1
                    ? {
                        type:     "sequence",
                        elements: elements
                      }
                    : elements[0];
                })(result24)
            : null;
          if (result23 !== null) {
            var result22 = result23;
          } else {
            var result22 = null;;
          };
        }
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result22
        };
        return result22;
      }
      
      function parse_labeled(context) {
        var cacheKey = "labeled" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos5 = pos;
        var result35 = parse_identifier(context);
        if (result35 !== null) {
          var result36 = parse_colon(context);
          if (result36 !== null) {
            var result37 = parse_prefixed(context);
            if (result37 !== null) {
              var result34 = [result35, result36, result37];
            } else {
              var result34 = null;
              pos = savedPos5;
            }
          } else {
            var result34 = null;
            pos = savedPos5;
          }
        } else {
          var result34 = null;
          pos = savedPos5;
        }
        var result33 = result34 !== null
          ? (function(label, expression) {
                return {
                  type:       "labeled",
                  label:      label,
                  expression: expression
                };
              })(result34[0], result34[2])
          : null;
        if (result33 !== null) {
          var result31 = result33;
        } else {
          var result32 = parse_prefixed(context);
          if (result32 !== null) {
            var result31 = result32;
          } else {
            var result31 = null;;
          };
        }
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result31
        };
        return result31;
      }
      
      function parse_prefixed(context) {
        var cacheKey = "prefixed" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos7 = pos;
        var result46 = parse_and(context);
        if (result46 !== null) {
          var result47 = parse_suffixed(context);
          if (result47 !== null) {
            var result45 = [result46, result47];
          } else {
            var result45 = null;
            pos = savedPos7;
          }
        } else {
          var result45 = null;
          pos = savedPos7;
        }
        var result44 = result45 !== null
          ? (function(expression) {
                return {
                  type:       "and_predicate",
                  expression: expression
                };
              })(result45[1])
          : null;
        if (result44 !== null) {
          var result38 = result44;
        } else {
          var savedPos6 = pos;
          var result42 = parse_not(context);
          if (result42 !== null) {
            var result43 = parse_suffixed(context);
            if (result43 !== null) {
              var result41 = [result42, result43];
            } else {
              var result41 = null;
              pos = savedPos6;
            }
          } else {
            var result41 = null;
            pos = savedPos6;
          }
          var result40 = result41 !== null
            ? (function(expression) {
                  return {
                    type:       "not_predicate",
                    expression: expression
                  };
                })(result41[1])
            : null;
          if (result40 !== null) {
            var result38 = result40;
          } else {
            var result39 = parse_suffixed(context);
            if (result39 !== null) {
              var result38 = result39;
            } else {
              var result38 = null;;
            };
          };
        }
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result38
        };
        return result38;
      }
      
      function parse_suffixed(context) {
        var cacheKey = "suffixed" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos10 = pos;
        var result60 = parse_primary(context);
        if (result60 !== null) {
          var result61 = parse_question(context);
          if (result61 !== null) {
            var result59 = [result60, result61];
          } else {
            var result59 = null;
            pos = savedPos10;
          }
        } else {
          var result59 = null;
          pos = savedPos10;
        }
        var result58 = result59 !== null
          ? (function(expression) {
                return {
                  type:       "optional",
                  expression: expression
                };
              })(result59[0])
          : null;
        if (result58 !== null) {
          var result48 = result58;
        } else {
          var savedPos9 = pos;
          var result56 = parse_primary(context);
          if (result56 !== null) {
            var result57 = parse_star(context);
            if (result57 !== null) {
              var result55 = [result56, result57];
            } else {
              var result55 = null;
              pos = savedPos9;
            }
          } else {
            var result55 = null;
            pos = savedPos9;
          }
          var result54 = result55 !== null
            ? (function(expression) {
                  return {
                    type:       "zero_or_more",
                    expression: expression
                  };
                })(result55[0])
            : null;
          if (result54 !== null) {
            var result48 = result54;
          } else {
            var savedPos8 = pos;
            var result52 = parse_primary(context);
            if (result52 !== null) {
              var result53 = parse_plus(context);
              if (result53 !== null) {
                var result51 = [result52, result53];
              } else {
                var result51 = null;
                pos = savedPos8;
              }
            } else {
              var result51 = null;
              pos = savedPos8;
            }
            var result50 = result51 !== null
              ? (function(expression) {
                    return {
                      type:       "one_or_more",
                      expression: expression
                    };
                  })(result51[0])
              : null;
            if (result50 !== null) {
              var result48 = result50;
            } else {
              var result49 = parse_primary(context);
              if (result49 !== null) {
                var result48 = result49;
              } else {
                var result48 = null;;
              };
            };
          };
        }
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result48
        };
        return result48;
      }
      
      function parse_primary(context) {
        var cacheKey = "primary" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos12 = pos;
        var result75 = parse_identifier(context);
        if (result75 !== null) {
          var savedPos13 = pos;
          var savedReportMatchFailuresVar0 = context.reportMatchFailures;
          context.reportMatchFailures = false;
          var savedPos14 = pos;
          var result81 = parse_literal(context);
          if (result81 !== null) {
            var result78 = result81;
          } else {
            if (input.substr(pos, 0) === "") {
              var result80 = "";
              pos += 0;
            } else {
              var result80 = null;
              if (context.reportMatchFailures) {
                matchFailed(quoteString(""));
              }
            }
            if (result80 !== null) {
              var result78 = result80;
            } else {
              var result78 = null;;
            };
          }
          if (result78 !== null) {
            var result79 = parse_equals(context);
            if (result79 !== null) {
              var result77 = [result78, result79];
            } else {
              var result77 = null;
              pos = savedPos14;
            }
          } else {
            var result77 = null;
            pos = savedPos14;
          }
          context.reportMatchFailures = savedReportMatchFailuresVar0;
          if (result77 === null) {
            var result76 = '';
          } else {
            var result76 = null;
            pos = savedPos13;
          }
          if (result76 !== null) {
            var result74 = [result75, result76];
          } else {
            var result74 = null;
            pos = savedPos12;
          }
        } else {
          var result74 = null;
          pos = savedPos12;
        }
        var result73 = result74 !== null
          ? (function(name) {
                return {
                  type: "rule_ref",
                  name: name
                };
              })(result74[0])
          : null;
        if (result73 !== null) {
          var result62 = result73;
        } else {
          var result72 = parse_literal(context);
          var result71 = result72 !== null
            ? (function(value) {
                  return {
                    type:  "literal",
                    value: value
                  };
                })(result72)
            : null;
          if (result71 !== null) {
            var result62 = result71;
          } else {
            var result70 = parse_dot(context);
            var result69 = result70 !== null
              ? (function() { return { type: "any" }; })()
              : null;
            if (result69 !== null) {
              var result62 = result69;
            } else {
              var result68 = parse_class(context);
              if (result68 !== null) {
                var result62 = result68;
              } else {
                var savedPos11 = pos;
                var result65 = parse_lparen(context);
                if (result65 !== null) {
                  var result66 = parse_choice(context);
                  if (result66 !== null) {
                    var result67 = parse_rparen(context);
                    if (result67 !== null) {
                      var result64 = [result65, result66, result67];
                    } else {
                      var result64 = null;
                      pos = savedPos11;
                    }
                  } else {
                    var result64 = null;
                    pos = savedPos11;
                  }
                } else {
                  var result64 = null;
                  pos = savedPos11;
                }
                var result63 = result64 !== null
                  ? (function(expression) { return expression; })(result64[1])
                  : null;
                if (result63 !== null) {
                  var result62 = result63;
                } else {
                  var result62 = null;;
                };
              };
            };
          };
        }
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result62
        };
        return result62;
      }
      
      function parse_action(context) {
        var cacheKey = "action" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        var savedReportMatchFailures = context.reportMatchFailures;
        context.reportMatchFailures = false;
        var savedPos15 = pos;
        var result84 = parse_braced(context);
        if (result84 !== null) {
          var result85 = parse___(context);
          if (result85 !== null) {
            var result83 = [result84, result85];
          } else {
            var result83 = null;
            pos = savedPos15;
          }
        } else {
          var result83 = null;
          pos = savedPos15;
        }
        var result82 = result83 !== null
          ? (function(braced) { return braced.substr(1, braced.length - 2); })(result83[0])
          : null;
        context.reportMatchFailures = savedReportMatchFailures;
        if (context.reportMatchFailures && result82 === null) {
          matchFailed("action");
        }
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result82
        };
        return result82;
      }
      
      function parse_braced(context) {
        var cacheKey = "braced" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos16 = pos;
        if (input.substr(pos, 1) === "{") {
          var result88 = "{";
          pos += 1;
        } else {
          var result88 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("{"));
          }
        }
        if (result88 !== null) {
          var result89 = [];
          var result93 = parse_braced(context);
          if (result93 !== null) {
            var result91 = result93;
          } else {
            var result92 = parse_nonBraceCharacter(context);
            if (result92 !== null) {
              var result91 = result92;
            } else {
              var result91 = null;;
            };
          }
          while (result91 !== null) {
            result89.push(result91);
            var result93 = parse_braced(context);
            if (result93 !== null) {
              var result91 = result93;
            } else {
              var result92 = parse_nonBraceCharacter(context);
              if (result92 !== null) {
                var result91 = result92;
              } else {
                var result91 = null;;
              };
            }
          }
          if (result89 !== null) {
            if (input.substr(pos, 1) === "}") {
              var result90 = "}";
              pos += 1;
            } else {
              var result90 = null;
              if (context.reportMatchFailures) {
                matchFailed(quoteString("}"));
              }
            }
            if (result90 !== null) {
              var result87 = [result88, result89, result90];
            } else {
              var result87 = null;
              pos = savedPos16;
            }
          } else {
            var result87 = null;
            pos = savedPos16;
          }
        } else {
          var result87 = null;
          pos = savedPos16;
        }
        var result86 = result87 !== null
          ? (function(parts) {
                return "{" + parts.join("") + "}";
              })(result87[1])
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result86
        };
        return result86;
      }
      
      function parse_nonBraceCharacters(context) {
        var cacheKey = "nonBraceCharacters" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var result96 = parse_nonBraceCharacter(context);
        if (result96 !== null) {
          var result95 = [];
          while (result96 !== null) {
            result95.push(result96);
            var result96 = parse_nonBraceCharacter(context);
          }
        } else {
          var result95 = null;
        }
        var result94 = result95 !== null
          ? (function(chars) { return chars.join(""); })(result95)
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result94
        };
        return result94;
      }
      
      function parse_nonBraceCharacter(context) {
        var cacheKey = "nonBraceCharacter" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        if (input.substr(pos).match(/^[^{}]/) !== null) {
          var result97 = input.charAt(pos);
          pos++;
        } else {
          var result97 = null;
          if (context.reportMatchFailures) {
            matchFailed("[^{}]");
          }
        }
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result97
        };
        return result97;
      }
      
      function parse_equals(context) {
        var cacheKey = "equals" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos17 = pos;
        if (input.substr(pos, 1) === "=") {
          var result100 = "=";
          pos += 1;
        } else {
          var result100 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("="));
          }
        }
        if (result100 !== null) {
          var result101 = parse___(context);
          if (result101 !== null) {
            var result99 = [result100, result101];
          } else {
            var result99 = null;
            pos = savedPos17;
          }
        } else {
          var result99 = null;
          pos = savedPos17;
        }
        var result98 = result99 !== null
          ? (function() { return "="; })()
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result98
        };
        return result98;
      }
      
      function parse_colon(context) {
        var cacheKey = "colon" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos18 = pos;
        if (input.substr(pos, 1) === ":") {
          var result104 = ":";
          pos += 1;
        } else {
          var result104 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString(":"));
          }
        }
        if (result104 !== null) {
          var result105 = parse___(context);
          if (result105 !== null) {
            var result103 = [result104, result105];
          } else {
            var result103 = null;
            pos = savedPos18;
          }
        } else {
          var result103 = null;
          pos = savedPos18;
        }
        var result102 = result103 !== null
          ? (function() { return ":"; })()
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result102
        };
        return result102;
      }
      
      function parse_semicolon(context) {
        var cacheKey = "semicolon" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos19 = pos;
        if (input.substr(pos, 1) === ";") {
          var result108 = ";";
          pos += 1;
        } else {
          var result108 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString(";"));
          }
        }
        if (result108 !== null) {
          var result109 = parse___(context);
          if (result109 !== null) {
            var result107 = [result108, result109];
          } else {
            var result107 = null;
            pos = savedPos19;
          }
        } else {
          var result107 = null;
          pos = savedPos19;
        }
        var result106 = result107 !== null
          ? (function() { return ";"; })()
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result106
        };
        return result106;
      }
      
      function parse_slash(context) {
        var cacheKey = "slash" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos20 = pos;
        if (input.substr(pos, 1) === "/") {
          var result112 = "/";
          pos += 1;
        } else {
          var result112 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("/"));
          }
        }
        if (result112 !== null) {
          var result113 = parse___(context);
          if (result113 !== null) {
            var result111 = [result112, result113];
          } else {
            var result111 = null;
            pos = savedPos20;
          }
        } else {
          var result111 = null;
          pos = savedPos20;
        }
        var result110 = result111 !== null
          ? (function() { return "/"; })()
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result110
        };
        return result110;
      }
      
      function parse_and(context) {
        var cacheKey = "and" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos21 = pos;
        if (input.substr(pos, 1) === "&") {
          var result116 = "&";
          pos += 1;
        } else {
          var result116 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("&"));
          }
        }
        if (result116 !== null) {
          var result117 = parse___(context);
          if (result117 !== null) {
            var result115 = [result116, result117];
          } else {
            var result115 = null;
            pos = savedPos21;
          }
        } else {
          var result115 = null;
          pos = savedPos21;
        }
        var result114 = result115 !== null
          ? (function() { return "&"; })()
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result114
        };
        return result114;
      }
      
      function parse_not(context) {
        var cacheKey = "not" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos22 = pos;
        if (input.substr(pos, 1) === "!") {
          var result120 = "!";
          pos += 1;
        } else {
          var result120 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("!"));
          }
        }
        if (result120 !== null) {
          var result121 = parse___(context);
          if (result121 !== null) {
            var result119 = [result120, result121];
          } else {
            var result119 = null;
            pos = savedPos22;
          }
        } else {
          var result119 = null;
          pos = savedPos22;
        }
        var result118 = result119 !== null
          ? (function() { return "!"; })()
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result118
        };
        return result118;
      }
      
      function parse_question(context) {
        var cacheKey = "question" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos23 = pos;
        if (input.substr(pos, 1) === "?") {
          var result124 = "?";
          pos += 1;
        } else {
          var result124 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("?"));
          }
        }
        if (result124 !== null) {
          var result125 = parse___(context);
          if (result125 !== null) {
            var result123 = [result124, result125];
          } else {
            var result123 = null;
            pos = savedPos23;
          }
        } else {
          var result123 = null;
          pos = savedPos23;
        }
        var result122 = result123 !== null
          ? (function() { return "?"; })()
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result122
        };
        return result122;
      }
      
      function parse_star(context) {
        var cacheKey = "star" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos24 = pos;
        if (input.substr(pos, 1) === "*") {
          var result128 = "*";
          pos += 1;
        } else {
          var result128 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("*"));
          }
        }
        if (result128 !== null) {
          var result129 = parse___(context);
          if (result129 !== null) {
            var result127 = [result128, result129];
          } else {
            var result127 = null;
            pos = savedPos24;
          }
        } else {
          var result127 = null;
          pos = savedPos24;
        }
        var result126 = result127 !== null
          ? (function() { return "*"; })()
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result126
        };
        return result126;
      }
      
      function parse_plus(context) {
        var cacheKey = "plus" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos25 = pos;
        if (input.substr(pos, 1) === "+") {
          var result132 = "+";
          pos += 1;
        } else {
          var result132 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("+"));
          }
        }
        if (result132 !== null) {
          var result133 = parse___(context);
          if (result133 !== null) {
            var result131 = [result132, result133];
          } else {
            var result131 = null;
            pos = savedPos25;
          }
        } else {
          var result131 = null;
          pos = savedPos25;
        }
        var result130 = result131 !== null
          ? (function() { return "+"; })()
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result130
        };
        return result130;
      }
      
      function parse_lparen(context) {
        var cacheKey = "lparen" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos26 = pos;
        if (input.substr(pos, 1) === "(") {
          var result136 = "(";
          pos += 1;
        } else {
          var result136 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("("));
          }
        }
        if (result136 !== null) {
          var result137 = parse___(context);
          if (result137 !== null) {
            var result135 = [result136, result137];
          } else {
            var result135 = null;
            pos = savedPos26;
          }
        } else {
          var result135 = null;
          pos = savedPos26;
        }
        var result134 = result135 !== null
          ? (function() { return "("; })()
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result134
        };
        return result134;
      }
      
      function parse_rparen(context) {
        var cacheKey = "rparen" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos27 = pos;
        if (input.substr(pos, 1) === ")") {
          var result140 = ")";
          pos += 1;
        } else {
          var result140 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString(")"));
          }
        }
        if (result140 !== null) {
          var result141 = parse___(context);
          if (result141 !== null) {
            var result139 = [result140, result141];
          } else {
            var result139 = null;
            pos = savedPos27;
          }
        } else {
          var result139 = null;
          pos = savedPos27;
        }
        var result138 = result139 !== null
          ? (function() { return ")"; })()
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result138
        };
        return result138;
      }
      
      function parse_dot(context) {
        var cacheKey = "dot" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos28 = pos;
        if (input.substr(pos, 1) === ".") {
          var result144 = ".";
          pos += 1;
        } else {
          var result144 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("."));
          }
        }
        if (result144 !== null) {
          var result145 = parse___(context);
          if (result145 !== null) {
            var result143 = [result144, result145];
          } else {
            var result143 = null;
            pos = savedPos28;
          }
        } else {
          var result143 = null;
          pos = savedPos28;
        }
        var result142 = result143 !== null
          ? (function() { return "."; })()
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result142
        };
        return result142;
      }
      
      function parse_identifier(context) {
        var cacheKey = "identifier" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        var savedReportMatchFailures = context.reportMatchFailures;
        context.reportMatchFailures = false;
        var savedPos29 = pos;
        var result158 = parse_letter(context);
        if (result158 !== null) {
          var result148 = result158;
        } else {
          if (input.substr(pos, 1) === "_") {
            var result157 = "_";
            pos += 1;
          } else {
            var result157 = null;
            if (context.reportMatchFailures) {
              matchFailed(quoteString("_"));
            }
          }
          if (result157 !== null) {
            var result148 = result157;
          } else {
            if (input.substr(pos, 1) === "$") {
              var result156 = "$";
              pos += 1;
            } else {
              var result156 = null;
              if (context.reportMatchFailures) {
                matchFailed(quoteString("$"));
              }
            }
            if (result156 !== null) {
              var result148 = result156;
            } else {
              var result148 = null;;
            };
          };
        }
        if (result148 !== null) {
          var result149 = [];
          var result155 = parse_letter(context);
          if (result155 !== null) {
            var result151 = result155;
          } else {
            var result154 = parse_digit(context);
            if (result154 !== null) {
              var result151 = result154;
            } else {
              if (input.substr(pos, 1) === "_") {
                var result153 = "_";
                pos += 1;
              } else {
                var result153 = null;
                if (context.reportMatchFailures) {
                  matchFailed(quoteString("_"));
                }
              }
              if (result153 !== null) {
                var result151 = result153;
              } else {
                if (input.substr(pos, 1) === "$") {
                  var result152 = "$";
                  pos += 1;
                } else {
                  var result152 = null;
                  if (context.reportMatchFailures) {
                    matchFailed(quoteString("$"));
                  }
                }
                if (result152 !== null) {
                  var result151 = result152;
                } else {
                  var result151 = null;;
                };
              };
            };
          }
          while (result151 !== null) {
            result149.push(result151);
            var result155 = parse_letter(context);
            if (result155 !== null) {
              var result151 = result155;
            } else {
              var result154 = parse_digit(context);
              if (result154 !== null) {
                var result151 = result154;
              } else {
                if (input.substr(pos, 1) === "_") {
                  var result153 = "_";
                  pos += 1;
                } else {
                  var result153 = null;
                  if (context.reportMatchFailures) {
                    matchFailed(quoteString("_"));
                  }
                }
                if (result153 !== null) {
                  var result151 = result153;
                } else {
                  if (input.substr(pos, 1) === "$") {
                    var result152 = "$";
                    pos += 1;
                  } else {
                    var result152 = null;
                    if (context.reportMatchFailures) {
                      matchFailed(quoteString("$"));
                    }
                  }
                  if (result152 !== null) {
                    var result151 = result152;
                  } else {
                    var result151 = null;;
                  };
                };
              };
            }
          }
          if (result149 !== null) {
            var result150 = parse___(context);
            if (result150 !== null) {
              var result147 = [result148, result149, result150];
            } else {
              var result147 = null;
              pos = savedPos29;
            }
          } else {
            var result147 = null;
            pos = savedPos29;
          }
        } else {
          var result147 = null;
          pos = savedPos29;
        }
        var result146 = result147 !== null
          ? (function(head, tail) {
                return head + tail.join("");
              })(result147[0], result147[1])
          : null;
        context.reportMatchFailures = savedReportMatchFailures;
        if (context.reportMatchFailures && result146 === null) {
          matchFailed("identifier");
        }
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result146
        };
        return result146;
      }
      
      function parse_literal(context) {
        var cacheKey = "literal" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        var savedReportMatchFailures = context.reportMatchFailures;
        context.reportMatchFailures = false;
        var savedPos30 = pos;
        var result164 = parse_doubleQuotedLiteral(context);
        if (result164 !== null) {
          var result161 = result164;
        } else {
          var result163 = parse_singleQuotedLiteral(context);
          if (result163 !== null) {
            var result161 = result163;
          } else {
            var result161 = null;;
          };
        }
        if (result161 !== null) {
          var result162 = parse___(context);
          if (result162 !== null) {
            var result160 = [result161, result162];
          } else {
            var result160 = null;
            pos = savedPos30;
          }
        } else {
          var result160 = null;
          pos = savedPos30;
        }
        var result159 = result160 !== null
          ? (function(literal) { return literal; })(result160[0])
          : null;
        context.reportMatchFailures = savedReportMatchFailures;
        if (context.reportMatchFailures && result159 === null) {
          matchFailed("literal");
        }
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result159
        };
        return result159;
      }
      
      function parse_doubleQuotedLiteral(context) {
        var cacheKey = "doubleQuotedLiteral" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos31 = pos;
        if (input.substr(pos, 1) === "\"") {
          var result167 = "\"";
          pos += 1;
        } else {
          var result167 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("\""));
          }
        }
        if (result167 !== null) {
          var result168 = [];
          var result170 = parse_doubleQuotedCharacter(context);
          while (result170 !== null) {
            result168.push(result170);
            var result170 = parse_doubleQuotedCharacter(context);
          }
          if (result168 !== null) {
            if (input.substr(pos, 1) === "\"") {
              var result169 = "\"";
              pos += 1;
            } else {
              var result169 = null;
              if (context.reportMatchFailures) {
                matchFailed(quoteString("\""));
              }
            }
            if (result169 !== null) {
              var result166 = [result167, result168, result169];
            } else {
              var result166 = null;
              pos = savedPos31;
            }
          } else {
            var result166 = null;
            pos = savedPos31;
          }
        } else {
          var result166 = null;
          pos = savedPos31;
        }
        var result165 = result166 !== null
          ? (function(chars) { return chars.join(""); })(result166[1])
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result165
        };
        return result165;
      }
      
      function parse_doubleQuotedCharacter(context) {
        var cacheKey = "doubleQuotedCharacter" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var result177 = parse_simpleDoubleQuotedCharacter(context);
        if (result177 !== null) {
          var result171 = result177;
        } else {
          var result176 = parse_simpleEscapeSequence(context);
          if (result176 !== null) {
            var result171 = result176;
          } else {
            var result175 = parse_zeroEscapeSequence(context);
            if (result175 !== null) {
              var result171 = result175;
            } else {
              var result174 = parse_hexEscapeSequence(context);
              if (result174 !== null) {
                var result171 = result174;
              } else {
                var result173 = parse_unicodeEscapeSequence(context);
                if (result173 !== null) {
                  var result171 = result173;
                } else {
                  var result172 = parse_eolEscapeSequence(context);
                  if (result172 !== null) {
                    var result171 = result172;
                  } else {
                    var result171 = null;;
                  };
                };
              };
            };
          };
        }
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result171
        };
        return result171;
      }
      
      function parse_simpleDoubleQuotedCharacter(context) {
        var cacheKey = "simpleDoubleQuotedCharacter" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos32 = pos;
        var savedPos33 = pos;
        var savedReportMatchFailuresVar1 = context.reportMatchFailures;
        context.reportMatchFailures = false;
        if (input.substr(pos, 1) === "\"") {
          var result185 = "\"";
          pos += 1;
        } else {
          var result185 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("\""));
          }
        }
        if (result185 !== null) {
          var result182 = result185;
        } else {
          if (input.substr(pos, 1) === "\\") {
            var result184 = "\\";
            pos += 1;
          } else {
            var result184 = null;
            if (context.reportMatchFailures) {
              matchFailed(quoteString("\\"));
            }
          }
          if (result184 !== null) {
            var result182 = result184;
          } else {
            var result183 = parse_eolChar(context);
            if (result183 !== null) {
              var result182 = result183;
            } else {
              var result182 = null;;
            };
          };
        }
        context.reportMatchFailures = savedReportMatchFailuresVar1;
        if (result182 === null) {
          var result180 = '';
        } else {
          var result180 = null;
          pos = savedPos33;
        }
        if (result180 !== null) {
          if (input.length > pos) {
            var result181 = input.charAt(pos);
            pos++;
          } else {
            var result181 = null;
            if (context.reportMatchFailures) {
              matchFailed('any character');
            }
          }
          if (result181 !== null) {
            var result179 = [result180, result181];
          } else {
            var result179 = null;
            pos = savedPos32;
          }
        } else {
          var result179 = null;
          pos = savedPos32;
        }
        var result178 = result179 !== null
          ? (function(char_) { return char_; })(result179[1])
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result178
        };
        return result178;
      }
      
      function parse_singleQuotedLiteral(context) {
        var cacheKey = "singleQuotedLiteral" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos34 = pos;
        if (input.substr(pos, 1) === "'") {
          var result188 = "'";
          pos += 1;
        } else {
          var result188 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("'"));
          }
        }
        if (result188 !== null) {
          var result189 = [];
          var result191 = parse_singleQuotedCharacter(context);
          while (result191 !== null) {
            result189.push(result191);
            var result191 = parse_singleQuotedCharacter(context);
          }
          if (result189 !== null) {
            if (input.substr(pos, 1) === "'") {
              var result190 = "'";
              pos += 1;
            } else {
              var result190 = null;
              if (context.reportMatchFailures) {
                matchFailed(quoteString("'"));
              }
            }
            if (result190 !== null) {
              var result187 = [result188, result189, result190];
            } else {
              var result187 = null;
              pos = savedPos34;
            }
          } else {
            var result187 = null;
            pos = savedPos34;
          }
        } else {
          var result187 = null;
          pos = savedPos34;
        }
        var result186 = result187 !== null
          ? (function(chars) { return chars.join(""); })(result187[1])
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result186
        };
        return result186;
      }
      
      function parse_singleQuotedCharacter(context) {
        var cacheKey = "singleQuotedCharacter" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var result198 = parse_simpleSingleQuotedCharacter(context);
        if (result198 !== null) {
          var result192 = result198;
        } else {
          var result197 = parse_simpleEscapeSequence(context);
          if (result197 !== null) {
            var result192 = result197;
          } else {
            var result196 = parse_zeroEscapeSequence(context);
            if (result196 !== null) {
              var result192 = result196;
            } else {
              var result195 = parse_hexEscapeSequence(context);
              if (result195 !== null) {
                var result192 = result195;
              } else {
                var result194 = parse_unicodeEscapeSequence(context);
                if (result194 !== null) {
                  var result192 = result194;
                } else {
                  var result193 = parse_eolEscapeSequence(context);
                  if (result193 !== null) {
                    var result192 = result193;
                  } else {
                    var result192 = null;;
                  };
                };
              };
            };
          };
        }
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result192
        };
        return result192;
      }
      
      function parse_simpleSingleQuotedCharacter(context) {
        var cacheKey = "simpleSingleQuotedCharacter" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos35 = pos;
        var savedPos36 = pos;
        var savedReportMatchFailuresVar2 = context.reportMatchFailures;
        context.reportMatchFailures = false;
        if (input.substr(pos, 1) === "'") {
          var result206 = "'";
          pos += 1;
        } else {
          var result206 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("'"));
          }
        }
        if (result206 !== null) {
          var result203 = result206;
        } else {
          if (input.substr(pos, 1) === "\\") {
            var result205 = "\\";
            pos += 1;
          } else {
            var result205 = null;
            if (context.reportMatchFailures) {
              matchFailed(quoteString("\\"));
            }
          }
          if (result205 !== null) {
            var result203 = result205;
          } else {
            var result204 = parse_eolChar(context);
            if (result204 !== null) {
              var result203 = result204;
            } else {
              var result203 = null;;
            };
          };
        }
        context.reportMatchFailures = savedReportMatchFailuresVar2;
        if (result203 === null) {
          var result201 = '';
        } else {
          var result201 = null;
          pos = savedPos36;
        }
        if (result201 !== null) {
          if (input.length > pos) {
            var result202 = input.charAt(pos);
            pos++;
          } else {
            var result202 = null;
            if (context.reportMatchFailures) {
              matchFailed('any character');
            }
          }
          if (result202 !== null) {
            var result200 = [result201, result202];
          } else {
            var result200 = null;
            pos = savedPos35;
          }
        } else {
          var result200 = null;
          pos = savedPos35;
        }
        var result199 = result200 !== null
          ? (function(char_) { return char_; })(result200[1])
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result199
        };
        return result199;
      }
      
      function parse_class(context) {
        var cacheKey = "class" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        var savedReportMatchFailures = context.reportMatchFailures;
        context.reportMatchFailures = false;
        var savedPos37 = pos;
        if (input.substr(pos, 1) === "[") {
          var result209 = "[";
          pos += 1;
        } else {
          var result209 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("["));
          }
        }
        if (result209 !== null) {
          if (input.substr(pos, 1) === "^") {
            var result217 = "^";
            pos += 1;
          } else {
            var result217 = null;
            if (context.reportMatchFailures) {
              matchFailed(quoteString("^"));
            }
          }
          var result210 = result217 !== null ? result217 : '';
          if (result210 !== null) {
            var result211 = [];
            var result216 = parse_classCharacterRange(context);
            if (result216 !== null) {
              var result214 = result216;
            } else {
              var result215 = parse_classCharacter(context);
              if (result215 !== null) {
                var result214 = result215;
              } else {
                var result214 = null;;
              };
            }
            while (result214 !== null) {
              result211.push(result214);
              var result216 = parse_classCharacterRange(context);
              if (result216 !== null) {
                var result214 = result216;
              } else {
                var result215 = parse_classCharacter(context);
                if (result215 !== null) {
                  var result214 = result215;
                } else {
                  var result214 = null;;
                };
              }
            }
            if (result211 !== null) {
              if (input.substr(pos, 1) === "]") {
                var result212 = "]";
                pos += 1;
              } else {
                var result212 = null;
                if (context.reportMatchFailures) {
                  matchFailed(quoteString("]"));
                }
              }
              if (result212 !== null) {
                var result213 = parse___(context);
                if (result213 !== null) {
                  var result208 = [result209, result210, result211, result212, result213];
                } else {
                  var result208 = null;
                  pos = savedPos37;
                }
              } else {
                var result208 = null;
                pos = savedPos37;
              }
            } else {
              var result208 = null;
              pos = savedPos37;
            }
          } else {
            var result208 = null;
            pos = savedPos37;
          }
        } else {
          var result208 = null;
          pos = savedPos37;
        }
        var result207 = result208 !== null
          ? (function(inverted, parts) {
                partsConverted = PEG.ArrayUtils.map(parts, function(part) {
                  return part.data;
                });
                rawText = "["
                  + inverted
                  + PEG.ArrayUtils.map(parts, function(part) {
                      return part.rawText;
                    }).join("")
                  + "]";
          
                return {
                  type:     "class",
                  inverted: inverted === "^",
                  parts:    partsConverted,
                  // FIXME: Get the raw text from the input directly.
                  rawText:  rawText
                };
              })(result208[1], result208[2])
          : null;
        context.reportMatchFailures = savedReportMatchFailures;
        if (context.reportMatchFailures && result207 === null) {
          matchFailed("character class");
        }
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result207
        };
        return result207;
      }
      
      function parse_classCharacterRange(context) {
        var cacheKey = "classCharacterRange" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos38 = pos;
        var result220 = parse_classCharacter(context);
        if (result220 !== null) {
          if (input.substr(pos, 1) === "-") {
            var result221 = "-";
            pos += 1;
          } else {
            var result221 = null;
            if (context.reportMatchFailures) {
              matchFailed(quoteString("-"));
            }
          }
          if (result221 !== null) {
            var result222 = parse_classCharacter(context);
            if (result222 !== null) {
              var result219 = [result220, result221, result222];
            } else {
              var result219 = null;
              pos = savedPos38;
            }
          } else {
            var result219 = null;
            pos = savedPos38;
          }
        } else {
          var result219 = null;
          pos = savedPos38;
        }
        var result218 = result219 !== null
          ? (function(begin, end) {
                if (begin.data.charCodeAt(0) > end.data.charCodeAt(0)) {
                  throw new this.SyntaxError(
                    "Invalid character range: " + begin.rawText + "-" + end.rawText + "."
                  );
                }
          
                return {
                  data:    [begin.data, end.data],
                  // FIXME: Get the raw text from the input directly.
                  rawText: begin.rawText + "-" + end.rawText
                }
              })(result219[0], result219[2])
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result218
        };
        return result218;
      }
      
      function parse_classCharacter(context) {
        var cacheKey = "classCharacter" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var result224 = parse_bracketDelimitedCharacter(context);
        var result223 = result224 !== null
          ? (function(char_) {
                return {
                  data:    char_,
                  // FIXME: Get the raw text from the input directly.
                  rawText: PEG.RegExpUtils.quoteForClass(char_)
                };
              })(result224)
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result223
        };
        return result223;
      }
      
      function parse_bracketDelimitedCharacter(context) {
        var cacheKey = "bracketDelimitedCharacter" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var result231 = parse_simpleBracketDelimitedCharacter(context);
        if (result231 !== null) {
          var result225 = result231;
        } else {
          var result230 = parse_simpleEscapeSequence(context);
          if (result230 !== null) {
            var result225 = result230;
          } else {
            var result229 = parse_zeroEscapeSequence(context);
            if (result229 !== null) {
              var result225 = result229;
            } else {
              var result228 = parse_hexEscapeSequence(context);
              if (result228 !== null) {
                var result225 = result228;
              } else {
                var result227 = parse_unicodeEscapeSequence(context);
                if (result227 !== null) {
                  var result225 = result227;
                } else {
                  var result226 = parse_eolEscapeSequence(context);
                  if (result226 !== null) {
                    var result225 = result226;
                  } else {
                    var result225 = null;;
                  };
                };
              };
            };
          };
        }
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result225
        };
        return result225;
      }
      
      function parse_simpleBracketDelimitedCharacter(context) {
        var cacheKey = "simpleBracketDelimitedCharacter" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos39 = pos;
        var savedPos40 = pos;
        var savedReportMatchFailuresVar3 = context.reportMatchFailures;
        context.reportMatchFailures = false;
        if (input.substr(pos, 1) === "]") {
          var result239 = "]";
          pos += 1;
        } else {
          var result239 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("]"));
          }
        }
        if (result239 !== null) {
          var result236 = result239;
        } else {
          if (input.substr(pos, 1) === "\\") {
            var result238 = "\\";
            pos += 1;
          } else {
            var result238 = null;
            if (context.reportMatchFailures) {
              matchFailed(quoteString("\\"));
            }
          }
          if (result238 !== null) {
            var result236 = result238;
          } else {
            var result237 = parse_eolChar(context);
            if (result237 !== null) {
              var result236 = result237;
            } else {
              var result236 = null;;
            };
          };
        }
        context.reportMatchFailures = savedReportMatchFailuresVar3;
        if (result236 === null) {
          var result234 = '';
        } else {
          var result234 = null;
          pos = savedPos40;
        }
        if (result234 !== null) {
          if (input.length > pos) {
            var result235 = input.charAt(pos);
            pos++;
          } else {
            var result235 = null;
            if (context.reportMatchFailures) {
              matchFailed('any character');
            }
          }
          if (result235 !== null) {
            var result233 = [result234, result235];
          } else {
            var result233 = null;
            pos = savedPos39;
          }
        } else {
          var result233 = null;
          pos = savedPos39;
        }
        var result232 = result233 !== null
          ? (function(char_) { return char_; })(result233[1])
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result232
        };
        return result232;
      }
      
      function parse_simpleEscapeSequence(context) {
        var cacheKey = "simpleEscapeSequence" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos41 = pos;
        if (input.substr(pos, 1) === "\\") {
          var result242 = "\\";
          pos += 1;
        } else {
          var result242 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("\\"));
          }
        }
        if (result242 !== null) {
          var savedPos42 = pos;
          var savedReportMatchFailuresVar4 = context.reportMatchFailures;
          context.reportMatchFailures = false;
          var result249 = parse_digit(context);
          if (result249 !== null) {
            var result245 = result249;
          } else {
            if (input.substr(pos, 1) === "x") {
              var result248 = "x";
              pos += 1;
            } else {
              var result248 = null;
              if (context.reportMatchFailures) {
                matchFailed(quoteString("x"));
              }
            }
            if (result248 !== null) {
              var result245 = result248;
            } else {
              if (input.substr(pos, 1) === "u") {
                var result247 = "u";
                pos += 1;
              } else {
                var result247 = null;
                if (context.reportMatchFailures) {
                  matchFailed(quoteString("u"));
                }
              }
              if (result247 !== null) {
                var result245 = result247;
              } else {
                var result246 = parse_eolChar(context);
                if (result246 !== null) {
                  var result245 = result246;
                } else {
                  var result245 = null;;
                };
              };
            };
          }
          context.reportMatchFailures = savedReportMatchFailuresVar4;
          if (result245 === null) {
            var result243 = '';
          } else {
            var result243 = null;
            pos = savedPos42;
          }
          if (result243 !== null) {
            if (input.length > pos) {
              var result244 = input.charAt(pos);
              pos++;
            } else {
              var result244 = null;
              if (context.reportMatchFailures) {
                matchFailed('any character');
              }
            }
            if (result244 !== null) {
              var result241 = [result242, result243, result244];
            } else {
              var result241 = null;
              pos = savedPos41;
            }
          } else {
            var result241 = null;
            pos = savedPos41;
          }
        } else {
          var result241 = null;
          pos = savedPos41;
        }
        var result240 = result241 !== null
          ? (function(char_) {
                return char_
                  .replace("b", "\b")
                  .replace("f", "\f")
                  .replace("n", "\n")
                  .replace("r", "\r")
                  .replace("t", "\t")
                  .replace("v", "\x0B") // IE does not recognize "\v".
              })(result241[2])
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result240
        };
        return result240;
      }
      
      function parse_zeroEscapeSequence(context) {
        var cacheKey = "zeroEscapeSequence" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos43 = pos;
        if (input.substr(pos, 2) === "\\0") {
          var result252 = "\\0";
          pos += 2;
        } else {
          var result252 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("\\0"));
          }
        }
        if (result252 !== null) {
          var savedPos44 = pos;
          var savedReportMatchFailuresVar5 = context.reportMatchFailures;
          context.reportMatchFailures = false;
          var result254 = parse_digit(context);
          context.reportMatchFailures = savedReportMatchFailuresVar5;
          if (result254 === null) {
            var result253 = '';
          } else {
            var result253 = null;
            pos = savedPos44;
          }
          if (result253 !== null) {
            var result251 = [result252, result253];
          } else {
            var result251 = null;
            pos = savedPos43;
          }
        } else {
          var result251 = null;
          pos = savedPos43;
        }
        var result250 = result251 !== null
          ? (function() { return "\0"; })()
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result250
        };
        return result250;
      }
      
      function parse_hexEscapeSequence(context) {
        var cacheKey = "hexEscapeSequence" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos45 = pos;
        if (input.substr(pos, 2) === "\\x") {
          var result257 = "\\x";
          pos += 2;
        } else {
          var result257 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("\\x"));
          }
        }
        if (result257 !== null) {
          var result258 = parse_hexDigit(context);
          if (result258 !== null) {
            var result259 = parse_hexDigit(context);
            if (result259 !== null) {
              var result256 = [result257, result258, result259];
            } else {
              var result256 = null;
              pos = savedPos45;
            }
          } else {
            var result256 = null;
            pos = savedPos45;
          }
        } else {
          var result256 = null;
          pos = savedPos45;
        }
        var result255 = result256 !== null
          ? (function(h1, h2) {
                return String.fromCharCode(parseInt("0x" + h1 + h2));
              })(result256[1], result256[2])
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result255
        };
        return result255;
      }
      
      function parse_unicodeEscapeSequence(context) {
        var cacheKey = "unicodeEscapeSequence" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos46 = pos;
        if (input.substr(pos, 2) === "\\u") {
          var result262 = "\\u";
          pos += 2;
        } else {
          var result262 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("\\u"));
          }
        }
        if (result262 !== null) {
          var result263 = parse_hexDigit(context);
          if (result263 !== null) {
            var result264 = parse_hexDigit(context);
            if (result264 !== null) {
              var result265 = parse_hexDigit(context);
              if (result265 !== null) {
                var result266 = parse_hexDigit(context);
                if (result266 !== null) {
                  var result261 = [result262, result263, result264, result265, result266];
                } else {
                  var result261 = null;
                  pos = savedPos46;
                }
              } else {
                var result261 = null;
                pos = savedPos46;
              }
            } else {
              var result261 = null;
              pos = savedPos46;
            }
          } else {
            var result261 = null;
            pos = savedPos46;
          }
        } else {
          var result261 = null;
          pos = savedPos46;
        }
        var result260 = result261 !== null
          ? (function(h1, h2, h3, h4) {
                return String.fromCharCode(parseInt("0x" + h1 + h2 + h3 + h4));
              })(result261[1], result261[2], result261[3], result261[4])
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result260
        };
        return result260;
      }
      
      function parse_eolEscapeSequence(context) {
        var cacheKey = "eolEscapeSequence" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos47 = pos;
        if (input.substr(pos, 1) === "\\") {
          var result269 = "\\";
          pos += 1;
        } else {
          var result269 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("\\"));
          }
        }
        if (result269 !== null) {
          var result270 = parse_eol(context);
          if (result270 !== null) {
            var result268 = [result269, result270];
          } else {
            var result268 = null;
            pos = savedPos47;
          }
        } else {
          var result268 = null;
          pos = savedPos47;
        }
        var result267 = result268 !== null
          ? (function(eol) { return eol; })(result268[1])
          : null;
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result267
        };
        return result267;
      }
      
      function parse_digit(context) {
        var cacheKey = "digit" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        if (input.substr(pos).match(/^[0-9]/) !== null) {
          var result271 = input.charAt(pos);
          pos++;
        } else {
          var result271 = null;
          if (context.reportMatchFailures) {
            matchFailed("[0-9]");
          }
        }
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result271
        };
        return result271;
      }
      
      function parse_hexDigit(context) {
        var cacheKey = "hexDigit" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        if (input.substr(pos).match(/^[0-9a-fA-F]/) !== null) {
          var result272 = input.charAt(pos);
          pos++;
        } else {
          var result272 = null;
          if (context.reportMatchFailures) {
            matchFailed("[0-9a-fA-F]");
          }
        }
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result272
        };
        return result272;
      }
      
      function parse_letter(context) {
        var cacheKey = "letter" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var result275 = parse_lowerCaseLetter(context);
        if (result275 !== null) {
          var result273 = result275;
        } else {
          var result274 = parse_upperCaseLetter(context);
          if (result274 !== null) {
            var result273 = result274;
          } else {
            var result273 = null;;
          };
        }
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result273
        };
        return result273;
      }
      
      function parse_lowerCaseLetter(context) {
        var cacheKey = "lowerCaseLetter" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        if (input.substr(pos).match(/^[a-z]/) !== null) {
          var result276 = input.charAt(pos);
          pos++;
        } else {
          var result276 = null;
          if (context.reportMatchFailures) {
            matchFailed("[a-z]");
          }
        }
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result276
        };
        return result276;
      }
      
      function parse_upperCaseLetter(context) {
        var cacheKey = "upperCaseLetter" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        if (input.substr(pos).match(/^[A-Z]/) !== null) {
          var result277 = input.charAt(pos);
          pos++;
        } else {
          var result277 = null;
          if (context.reportMatchFailures) {
            matchFailed("[A-Z]");
          }
        }
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result277
        };
        return result277;
      }
      
      function parse___(context) {
        var cacheKey = "__" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var result278 = [];
        var result282 = parse_whitespace(context);
        if (result282 !== null) {
          var result279 = result282;
        } else {
          var result281 = parse_eol(context);
          if (result281 !== null) {
            var result279 = result281;
          } else {
            var result280 = parse_comment(context);
            if (result280 !== null) {
              var result279 = result280;
            } else {
              var result279 = null;;
            };
          };
        }
        while (result279 !== null) {
          result278.push(result279);
          var result282 = parse_whitespace(context);
          if (result282 !== null) {
            var result279 = result282;
          } else {
            var result281 = parse_eol(context);
            if (result281 !== null) {
              var result279 = result281;
            } else {
              var result280 = parse_comment(context);
              if (result280 !== null) {
                var result279 = result280;
              } else {
                var result279 = null;;
              };
            };
          }
        }
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result278
        };
        return result278;
      }
      
      function parse_comment(context) {
        var cacheKey = "comment" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        var savedReportMatchFailures = context.reportMatchFailures;
        context.reportMatchFailures = false;
        var result285 = parse_singleLineComment(context);
        if (result285 !== null) {
          var result283 = result285;
        } else {
          var result284 = parse_multiLineComment(context);
          if (result284 !== null) {
            var result283 = result284;
          } else {
            var result283 = null;;
          };
        }
        context.reportMatchFailures = savedReportMatchFailures;
        if (context.reportMatchFailures && result283 === null) {
          matchFailed("comment");
        }
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result283
        };
        return result283;
      }
      
      function parse_singleLineComment(context) {
        var cacheKey = "singleLineComment" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos48 = pos;
        if (input.substr(pos, 2) === "//") {
          var result287 = "//";
          pos += 2;
        } else {
          var result287 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("//"));
          }
        }
        if (result287 !== null) {
          var result288 = [];
          var savedPos49 = pos;
          var savedPos50 = pos;
          var savedReportMatchFailuresVar6 = context.reportMatchFailures;
          context.reportMatchFailures = false;
          var result292 = parse_eolChar(context);
          context.reportMatchFailures = savedReportMatchFailuresVar6;
          if (result292 === null) {
            var result290 = '';
          } else {
            var result290 = null;
            pos = savedPos50;
          }
          if (result290 !== null) {
            if (input.length > pos) {
              var result291 = input.charAt(pos);
              pos++;
            } else {
              var result291 = null;
              if (context.reportMatchFailures) {
                matchFailed('any character');
              }
            }
            if (result291 !== null) {
              var result289 = [result290, result291];
            } else {
              var result289 = null;
              pos = savedPos49;
            }
          } else {
            var result289 = null;
            pos = savedPos49;
          }
          while (result289 !== null) {
            result288.push(result289);
            var savedPos49 = pos;
            var savedPos50 = pos;
            var savedReportMatchFailuresVar6 = context.reportMatchFailures;
            context.reportMatchFailures = false;
            var result292 = parse_eolChar(context);
            context.reportMatchFailures = savedReportMatchFailuresVar6;
            if (result292 === null) {
              var result290 = '';
            } else {
              var result290 = null;
              pos = savedPos50;
            }
            if (result290 !== null) {
              if (input.length > pos) {
                var result291 = input.charAt(pos);
                pos++;
              } else {
                var result291 = null;
                if (context.reportMatchFailures) {
                  matchFailed('any character');
                }
              }
              if (result291 !== null) {
                var result289 = [result290, result291];
              } else {
                var result289 = null;
                pos = savedPos49;
              }
            } else {
              var result289 = null;
              pos = savedPos49;
            }
          }
          if (result288 !== null) {
            var result286 = [result287, result288];
          } else {
            var result286 = null;
            pos = savedPos48;
          }
        } else {
          var result286 = null;
          pos = savedPos48;
        }
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result286
        };
        return result286;
      }
      
      function parse_multiLineComment(context) {
        var cacheKey = "multiLineComment" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        var savedPos51 = pos;
        if (input.substr(pos, 2) === "/*") {
          var result294 = "/*";
          pos += 2;
        } else {
          var result294 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("/*"));
          }
        }
        if (result294 !== null) {
          var result295 = [];
          var savedPos52 = pos;
          var savedPos53 = pos;
          var savedReportMatchFailuresVar7 = context.reportMatchFailures;
          context.reportMatchFailures = false;
          if (input.substr(pos, 2) === "*/") {
            var result300 = "*/";
            pos += 2;
          } else {
            var result300 = null;
            if (context.reportMatchFailures) {
              matchFailed(quoteString("*/"));
            }
          }
          context.reportMatchFailures = savedReportMatchFailuresVar7;
          if (result300 === null) {
            var result298 = '';
          } else {
            var result298 = null;
            pos = savedPos53;
          }
          if (result298 !== null) {
            if (input.length > pos) {
              var result299 = input.charAt(pos);
              pos++;
            } else {
              var result299 = null;
              if (context.reportMatchFailures) {
                matchFailed('any character');
              }
            }
            if (result299 !== null) {
              var result297 = [result298, result299];
            } else {
              var result297 = null;
              pos = savedPos52;
            }
          } else {
            var result297 = null;
            pos = savedPos52;
          }
          while (result297 !== null) {
            result295.push(result297);
            var savedPos52 = pos;
            var savedPos53 = pos;
            var savedReportMatchFailuresVar7 = context.reportMatchFailures;
            context.reportMatchFailures = false;
            if (input.substr(pos, 2) === "*/") {
              var result300 = "*/";
              pos += 2;
            } else {
              var result300 = null;
              if (context.reportMatchFailures) {
                matchFailed(quoteString("*/"));
              }
            }
            context.reportMatchFailures = savedReportMatchFailuresVar7;
            if (result300 === null) {
              var result298 = '';
            } else {
              var result298 = null;
              pos = savedPos53;
            }
            if (result298 !== null) {
              if (input.length > pos) {
                var result299 = input.charAt(pos);
                pos++;
              } else {
                var result299 = null;
                if (context.reportMatchFailures) {
                  matchFailed('any character');
                }
              }
              if (result299 !== null) {
                var result297 = [result298, result299];
              } else {
                var result297 = null;
                pos = savedPos52;
              }
            } else {
              var result297 = null;
              pos = savedPos52;
            }
          }
          if (result295 !== null) {
            if (input.substr(pos, 2) === "*/") {
              var result296 = "*/";
              pos += 2;
            } else {
              var result296 = null;
              if (context.reportMatchFailures) {
                matchFailed(quoteString("*/"));
              }
            }
            if (result296 !== null) {
              var result293 = [result294, result295, result296];
            } else {
              var result293 = null;
              pos = savedPos51;
            }
          } else {
            var result293 = null;
            pos = savedPos51;
          }
        } else {
          var result293 = null;
          pos = savedPos51;
        }
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result293
        };
        return result293;
      }
      
      function parse_eol(context) {
        var cacheKey = "eol" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        var savedReportMatchFailures = context.reportMatchFailures;
        context.reportMatchFailures = false;
        if (input.substr(pos, 1) === "\n") {
          var result306 = "\n";
          pos += 1;
        } else {
          var result306 = null;
          if (context.reportMatchFailures) {
            matchFailed(quoteString("\n"));
          }
        }
        if (result306 !== null) {
          var result301 = result306;
        } else {
          if (input.substr(pos, 2) === "\r\n") {
            var result305 = "\r\n";
            pos += 2;
          } else {
            var result305 = null;
            if (context.reportMatchFailures) {
              matchFailed(quoteString("\r\n"));
            }
          }
          if (result305 !== null) {
            var result301 = result305;
          } else {
            if (input.substr(pos, 1) === "\r") {
              var result304 = "\r";
              pos += 1;
            } else {
              var result304 = null;
              if (context.reportMatchFailures) {
                matchFailed(quoteString("\r"));
              }
            }
            if (result304 !== null) {
              var result301 = result304;
            } else {
              if (input.substr(pos, 1) === "\u2028") {
                var result303 = "\u2028";
                pos += 1;
              } else {
                var result303 = null;
                if (context.reportMatchFailures) {
                  matchFailed(quoteString("\u2028"));
                }
              }
              if (result303 !== null) {
                var result301 = result303;
              } else {
                if (input.substr(pos, 1) === "\u2029") {
                  var result302 = "\u2029";
                  pos += 1;
                } else {
                  var result302 = null;
                  if (context.reportMatchFailures) {
                    matchFailed(quoteString("\u2029"));
                  }
                }
                if (result302 !== null) {
                  var result301 = result302;
                } else {
                  var result301 = null;;
                };
              };
            };
          };
        }
        context.reportMatchFailures = savedReportMatchFailures;
        if (context.reportMatchFailures && result301 === null) {
          matchFailed("end of line");
        }
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result301
        };
        return result301;
      }
      
      function parse_eolChar(context) {
        var cacheKey = "eolChar" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        
        if (input.substr(pos).match(/^[\n\r\u2028\u2029]/) !== null) {
          var result307 = input.charAt(pos);
          pos++;
        } else {
          var result307 = null;
          if (context.reportMatchFailures) {
            matchFailed("[\\n\\r\\u2028\\u2029]");
          }
        }
        
        
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result307
        };
        return result307;
      }
      
      function parse_whitespace(context) {
        var cacheKey = "whitespace" + '@' + pos;
        var cachedResult = cache[cacheKey];
        if (cachedResult) {
          pos = cachedResult.nextPos;
          return cachedResult.result;
        }
        
        var savedReportMatchFailures = context.reportMatchFailures;
        context.reportMatchFailures = false;
        if (input.substr(pos).match(/^[ 	  ᠎ -   　]/) !== null) {
          var result308 = input.charAt(pos);
          pos++;
        } else {
          var result308 = null;
          if (context.reportMatchFailures) {
            matchFailed("[ 	  ᠎ -   　]");
          }
        }
        context.reportMatchFailures = savedReportMatchFailures;
        if (context.reportMatchFailures && result308 === null) {
          matchFailed("whitespace");
        }
        
        cache[cacheKey] = {
          nextPos: pos,
          result:  result308
        };
        return result308;
      }
      
      function buildErrorMessage() {
        function buildExpected(failuresExpected) {
          switch (failuresExpected.length) {
            case 0:
              return 'end of input';
            case 1:
              return failuresExpected[0];
            default:
              failuresExpected.sort();
              return failuresExpected.slice(0, failuresExpected.length - 1).join(', ')
                + ' or '
                + failuresExpected[failuresExpected.length - 1];
          }
        }
        
        var expected = buildExpected(rightmostMatchFailuresExpected);
        var actualPos = Math.max(pos, rightmostMatchFailuresPos);
        var actual = actualPos < input.length
          ? quoteString(input.charAt(actualPos))
          : 'end of input';
        
        return 'Expected ' + expected + ' but ' + actual + ' found.';
      }
      
      function computeErrorPosition() {
        /*
         * The first idea was to use |String.split| to break the input up to the
         * error position along newlines and derive the line and column from
         * there. However IE's |split| implementation is so broken that it was
         * enough to prevent it.
         */
        
        var line = 1;
        var column = 1;
        var seenCR = false;
        
        for (var i = 0; i <  rightmostMatchFailuresPos; i++) {
          var ch = input.charAt(i);
          if (ch === '\n') {
            if (!seenCR) { line++; }
            column = 1;
            seenCR = false;
          } else if (ch === '\r' | ch === '\u2028' || ch === '\u2029') {
            line++;
            column = 1;
            seenCR = true;
          } else {
            column++;
            seenCR = false;
          }
        }
        
        return { line: line, column: column };
      }
      
      var result = parse_grammar({ reportMatchFailures: true });
      
      /*
       * The parser is now in one of the following three states:
       *
       * 1. The parser successfully parsed the whole input.
       *
       *    - |result !== null|
       *    - |pos === input.length|
       *    - |rightmostMatchFailuresExpected| may or may not contain something
       *
       * 2. The parser successfully parsed only a part of the input.
       *
       *    - |result !== null|
       *    - |pos < input.length|
       *    - |rightmostMatchFailuresExpected| may or may not contain something
       *
       * 3. The parser did not successfully parse any part of the input.
       *
       *   - |result === null|
       *   - |pos === 0|
       *   - |rightmostMatchFailuresExpected| contains at least one failure
       *
       * All code following this comment (including called functions) must
       * handle these states.
       */
      if (result === null || pos !== input.length) {
        var errorPosition = computeErrorPosition();
        throw new this.SyntaxError(
          buildErrorMessage(),
          errorPosition.line,
          errorPosition.column
        );
      }
      
      return result;
    },
    
    /* Returns the parser source code. */
    toSource: function() { return this._source; }
  };
  
  /* Thrown when a parser encounters a syntax error. */
  
  result.SyntaxError = function(message, line, column) {
    this.name = 'SyntaxError';
    this.message = message;
    this.line = line;
    this.column = column;
  };
  
  result.SyntaxError.prototype = Error.prototype;
  
  return result;
})();