pegjs/lib/parser.js

module.exports = (function(){
  /*
   * Generated by PEG.js 0.7.0.
   *
   * http://pegjs.majda.cz/
   */
  
  function subclass(child, parent) {
    function ctor() { this.constructor = child; }
    ctor.prototype = parent.prototype;
    child.prototype = new ctor();
  }
  
  function quote(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.
     *
     * For portability, we also escape escape all control and non-ASCII
     * characters. Note that "\0" and "\v" escape sequences are not used
     * because JSHint does not like the first and IE the second.
     */
     return '"' + s
      .replace(/\\/g, '\\\\')  // backslash
      .replace(/"/g, '\\"')    // closing quote character
      .replace(/\x08/g, '\\b') // backspace
      .replace(/\t/g, '\\t')   // horizontal tab
      .replace(/\n/g, '\\n')   // line feed
      .replace(/\f/g, '\\f')   // form feed
      .replace(/\r/g, '\\r')   // carriage return
      .replace(/[\x00-\x07\x0B\x0E-\x1F\x80-\uFFFF]/g, escape)
      + '"';
  }
  
  var result = {
    /*
     * Parses the input with a generated parser. If the parsing is successful,
     * 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.parser.SyntaxError| describing the error.
     */
    parse: function(input) {
      var parseFunctions = {
        "grammar": parse_grammar
      };
      
      var options = arguments.length > 1 ? arguments[1] : {},
          startRule;
      
      if (options.startRule !== undefined) {
        startRule = options.startRule;
        
        if (parseFunctions[startRule] === undefined) {
          throw new Error("Can't start parsing from rule " + quote(startRule) + ".");
        }
      } else {
        startRule = "grammar";
      }
      
      var pos = 0;
      var reportFailures = 0;
      var rightmostFailuresPos = 0;
      var rightmostFailuresExpected = [];
      
      function padLeft(input, padding, length) {
        var result = input;
        
        var padLength = length - input.length;
        for (var i = 0; i < padLength; i++) {
          result = padding + result;
        }
        
        return result;
      }
      
      function escape(ch) {
        var charCode = ch.charCodeAt(0);
        var escapeChar;
        var length;
        
        if (charCode <= 0xFF) {
          escapeChar = 'x';
          length = 2;
        } else {
          escapeChar = 'u';
          length = 4;
        }
        
        return '\\' + escapeChar + padLeft(charCode.toString(16).toUpperCase(), '0', length);
      }
      
      function matchFailed(failure) {
        if (pos < rightmostFailuresPos) {
          return;
        }
        
        if (pos > rightmostFailuresPos) {
          rightmostFailuresPos = pos;
          rightmostFailuresExpected = [];
        }
        
        rightmostFailuresExpected.push(failure);
      }
      
      function parse_grammar() {
        var r0, r1, r2, r3, r4, r5, r6;
        
        r1 = pos;
        r2 = pos;
        r3 = parse___();
        if (r3 !== null) {
          r4 = parse_initializer();
          r4 = r4 !== null ? r4 : "";
          if (r4 !== null) {
            r6 = parse_rule();
            if (r6 !== null) {
              r5 = [];
              while (r6 !== null) {
                r5.push(r6);
                r6 = parse_rule();
              }
            } else {
              r5 = null;
            }
            if (r5 !== null) {
              r0 = [r3, r4, r5];
            } else {
              r0 = null;
              pos = r2;
            }
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, initializer, rules) {
              return {
                type:        "grammar",
                initializer: initializer !== "" ? initializer : null,
                rules:       rules,
                startRule:   rules[0].name
              };
            })(r1, r4, r5);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_initializer() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        r3 = parse_action();
        if (r3 !== null) {
          r4 = parse_semicolon();
          r4 = r4 !== null ? r4 : "";
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, code) {
              return {
                type: "initializer",
                code: code
              };
            })(r1, r3);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_rule() {
        var r0, r1, r2, r3, r4, r5, r6, r7;
        
        r1 = pos;
        r2 = pos;
        r3 = parse_identifier();
        if (r3 !== null) {
          r4 = parse_string();
          r4 = r4 !== null ? r4 : "";
          if (r4 !== null) {
            r5 = parse_equals();
            if (r5 !== null) {
              r6 = parse_choice();
              if (r6 !== null) {
                r7 = parse_semicolon();
                r7 = r7 !== null ? r7 : "";
                if (r7 !== null) {
                  r0 = [r3, r4, r5, r6, r7];
                } else {
                  r0 = null;
                  pos = r2;
                }
              } else {
                r0 = null;
                pos = r2;
              }
            } else {
              r0 = null;
              pos = r2;
            }
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, name, displayName, expression) {
              return {
                type:        "rule",
                name:        name,
                expression:  displayName !== ""
                  ? {
                      type:       "named",
                      name:       displayName,
                      expression: expression
                    }
                  : expression
              };
            })(r1, r3, r4, r6);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_choice() {
        var r0, r1, r2, r3, r4, r5, r6, r7, r8;
        
        r1 = pos;
        r2 = pos;
        r3 = parse_sequence();
        if (r3 !== null) {
          r4 = [];
          r6 = pos;
          r7 = parse_slash();
          if (r7 !== null) {
            r8 = parse_sequence();
            if (r8 !== null) {
              r5 = [r7, r8];
            } else {
              r5 = null;
              pos = r6;
            }
          } else {
            r5 = null;
            pos = r6;
          }
          while (r5 !== null) {
            r4.push(r5);
            r6 = pos;
            r7 = parse_slash();
            if (r7 !== null) {
              r8 = parse_sequence();
              if (r8 !== null) {
                r5 = [r7, r8];
              } else {
                r5 = null;
                pos = r6;
              }
            } else {
              r5 = null;
              pos = r6;
            }
          }
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, head, tail) {
              if (tail.length > 0) {
                var alternatives = [head].concat(utils.map(
                    tail,
                    function(element) { return element[1]; }
                ));
                return {
                  type:         "choice",
                  alternatives: alternatives
                };
              } else {
                return head;
              }
            })(r1, r3, r4);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_sequence() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        r3 = [];
        r4 = parse_labeled();
        while (r4 !== null) {
          r3.push(r4);
          r4 = parse_labeled();
        }
        if (r3 !== null) {
          r4 = parse_action();
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, elements, code) {
              var expression = elements.length !== 1
                ? {
                    type:     "sequence",
                    elements: elements
                  }
                : elements[0];
              return {
                type:       "action",
                expression: expression,
                code:       code
              };
            })(r1, r3, r4);
        }
        if (r0 === null) {
          pos = r1;
        }
        if (r0 === null) {
          r1 = pos;
          r0 = [];
          r2 = parse_labeled();
          while (r2 !== null) {
            r0.push(r2);
            r2 = parse_labeled();
          }
          if (r0 !== null) {
            r0 = (function(offset, elements) {
                return elements.length !== 1
                  ? {
                      type:     "sequence",
                      elements: elements
                    }
                  : elements[0];
              })(r1, r0);
          }
          if (r0 === null) {
            pos = r1;
          }
        }
        return r0;
      }
      
      function parse_labeled() {
        var r0, r1, r2, r3, r4, r5;
        
        r1 = pos;
        r2 = pos;
        r3 = parse_identifier();
        if (r3 !== null) {
          r4 = parse_colon();
          if (r4 !== null) {
            r5 = parse_prefixed();
            if (r5 !== null) {
              r0 = [r3, r4, r5];
            } else {
              r0 = null;
              pos = r2;
            }
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, label, expression) {
              return {
                type:       "labeled",
                label:      label,
                expression: expression
              };
            })(r1, r3, r5);
        }
        if (r0 === null) {
          pos = r1;
        }
        if (r0 === null) {
          r0 = parse_prefixed();
        }
        return r0;
      }
      
      function parse_prefixed() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        r3 = parse_and();
        if (r3 !== null) {
          r4 = parse_action();
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, code) {
              return {
                type: "semantic_and",
                code: code
              };
            })(r1, r4);
        }
        if (r0 === null) {
          pos = r1;
        }
        if (r0 === null) {
          r1 = pos;
          r2 = pos;
          r3 = parse_and();
          if (r3 !== null) {
            r4 = parse_suffixed();
            if (r4 !== null) {
              r0 = [r3, r4];
            } else {
              r0 = null;
              pos = r2;
            }
          } else {
            r0 = null;
            pos = r2;
          }
          if (r0 !== null) {
            r0 = (function(offset, expression) {
                return {
                  type:       "simple_and",
                  expression: expression
                };
              })(r1, r4);
          }
          if (r0 === null) {
            pos = r1;
          }
          if (r0 === null) {
            r1 = pos;
            r2 = pos;
            r3 = parse_not();
            if (r3 !== null) {
              r4 = parse_action();
              if (r4 !== null) {
                r0 = [r3, r4];
              } else {
                r0 = null;
                pos = r2;
              }
            } else {
              r0 = null;
              pos = r2;
            }
            if (r0 !== null) {
              r0 = (function(offset, code) {
                  return {
                    type: "semantic_not",
                    code: code
                  };
                })(r1, r4);
            }
            if (r0 === null) {
              pos = r1;
            }
            if (r0 === null) {
              r1 = pos;
              r2 = pos;
              r3 = parse_not();
              if (r3 !== null) {
                r4 = parse_suffixed();
                if (r4 !== null) {
                  r0 = [r3, r4];
                } else {
                  r0 = null;
                  pos = r2;
                }
              } else {
                r0 = null;
                pos = r2;
              }
              if (r0 !== null) {
                r0 = (function(offset, expression) {
                    return {
                      type:       "simple_not",
                      expression: expression
                    };
                  })(r1, r4);
              }
              if (r0 === null) {
                pos = r1;
              }
              if (r0 === null) {
                r0 = parse_suffixed();
              }
            }
          }
        }
        return r0;
      }
      
      function parse_suffixed() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        r3 = parse_primary();
        if (r3 !== null) {
          r4 = parse_question();
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, expression) {
              return {
                type:       "optional",
                expression: expression
              };
            })(r1, r3);
        }
        if (r0 === null) {
          pos = r1;
        }
        if (r0 === null) {
          r1 = pos;
          r2 = pos;
          r3 = parse_primary();
          if (r3 !== null) {
            r4 = parse_star();
            if (r4 !== null) {
              r0 = [r3, r4];
            } else {
              r0 = null;
              pos = r2;
            }
          } else {
            r0 = null;
            pos = r2;
          }
          if (r0 !== null) {
            r0 = (function(offset, expression) {
                return {
                  type:       "zero_or_more",
                  expression: expression
                };
              })(r1, r3);
          }
          if (r0 === null) {
            pos = r1;
          }
          if (r0 === null) {
            r1 = pos;
            r2 = pos;
            r3 = parse_primary();
            if (r3 !== null) {
              r4 = parse_plus();
              if (r4 !== null) {
                r0 = [r3, r4];
              } else {
                r0 = null;
                pos = r2;
              }
            } else {
              r0 = null;
              pos = r2;
            }
            if (r0 !== null) {
              r0 = (function(offset, expression) {
                  return {
                    type:       "one_or_more",
                    expression: expression
                  };
                })(r1, r3);
            }
            if (r0 === null) {
              pos = r1;
            }
            if (r0 === null) {
              r0 = parse_primary();
            }
          }
        }
        return r0;
      }
      
      function parse_primary() {
        var r0, r1, r2, r3, r4, r5, r6, r7, r8;
        
        r1 = pos;
        r2 = pos;
        r3 = parse_identifier();
        if (r3 !== null) {
          r5 = pos;
          reportFailures++;
          r6 = pos;
          r7 = parse_string();
          r7 = r7 !== null ? r7 : "";
          if (r7 !== null) {
            r8 = parse_equals();
            if (r8 !== null) {
              r4 = [r7, r8];
            } else {
              r4 = null;
              pos = r6;
            }
          } else {
            r4 = null;
            pos = r6;
          }
          reportFailures--;
          if (r4 === null) {
            r4 = "";
          } else {
            r4 = null;
            pos = r5;
          }
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, name) {
              return {
                type: "rule_ref",
                name: name
              };
            })(r1, r3);
        }
        if (r0 === null) {
          pos = r1;
        }
        if (r0 === null) {
          r0 = parse_literal();
          if (r0 === null) {
            r0 = parse_class();
            if (r0 === null) {
              r1 = pos;
              r0 = parse_dot();
              if (r0 !== null) {
                r0 = (function(offset) { return { type: "any" }; })(r1);
              }
              if (r0 === null) {
                pos = r1;
              }
              if (r0 === null) {
                r1 = pos;
                r2 = pos;
                r3 = parse_lparen();
                if (r3 !== null) {
                  r4 = parse_choice();
                  if (r4 !== null) {
                    r5 = parse_rparen();
                    if (r5 !== null) {
                      r0 = [r3, r4, r5];
                    } else {
                      r0 = null;
                      pos = r2;
                    }
                  } else {
                    r0 = null;
                    pos = r2;
                  }
                } else {
                  r0 = null;
                  pos = r2;
                }
                if (r0 !== null) {
                  r0 = (function(offset, expression) { return expression; })(r1, r4);
                }
                if (r0 === null) {
                  pos = r1;
                }
              }
            }
          }
        }
        return r0;
      }
      
      function parse_action() {
        var r0, r1, r2, r3, r4;
        
        reportFailures++;
        r1 = pos;
        r2 = pos;
        r3 = parse_braced();
        if (r3 !== null) {
          r4 = parse___();
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, braced) { return braced.substr(1, braced.length - 2); })(r1, r3);
        }
        if (r0 === null) {
          pos = r1;
        }
        reportFailures--;
        if (reportFailures === 0 && r0 === null) {
          matchFailed("action");
        }
        return r0;
      }
      
      function parse_braced() {
        var r0, r1, r2, r3, r4, r5;
        
        r1 = pos;
        r2 = pos;
        if (input.charCodeAt(pos) === 123) {
          r3 = "{";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"{\"");
          }
        }
        if (r3 !== null) {
          r4 = [];
          r5 = parse_braced();
          if (r5 === null) {
            r5 = parse_nonBraceCharacters();
          }
          while (r5 !== null) {
            r4.push(r5);
            r5 = parse_braced();
            if (r5 === null) {
              r5 = parse_nonBraceCharacters();
            }
          }
          if (r4 !== null) {
            if (input.charCodeAt(pos) === 125) {
              r5 = "}";
              pos++;
            } else {
              r5 = null;
              if (reportFailures === 0) {
                matchFailed("\"}\"");
              }
            }
            if (r5 !== null) {
              r0 = [r3, r4, r5];
            } else {
              r0 = null;
              pos = r2;
            }
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, parts) {
              return "{" + parts.join("") + "}";
            })(r1, r4);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_nonBraceCharacters() {
        var r0, r1, r2;
        
        r1 = pos;
        r2 = parse_nonBraceCharacter();
        if (r2 !== null) {
          r0 = [];
          while (r2 !== null) {
            r0.push(r2);
            r2 = parse_nonBraceCharacter();
          }
        } else {
          r0 = null;
        }
        if (r0 !== null) {
          r0 = (function(offset, chars) { return chars.join(""); })(r1, r0);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_nonBraceCharacter() {
        var r0;
        
        if (/^[^{}]/.test(input.charAt(pos))) {
          r0 = input.charAt(pos);
          pos++;
        } else {
          r0 = null;
          if (reportFailures === 0) {
            matchFailed("[^{}]");
          }
        }
        return r0;
      }
      
      function parse_equals() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        if (input.charCodeAt(pos) === 61) {
          r3 = "=";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"=\"");
          }
        }
        if (r3 !== null) {
          r4 = parse___();
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset) { return "="; })(r1);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_colon() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        if (input.charCodeAt(pos) === 58) {
          r3 = ":";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\":\"");
          }
        }
        if (r3 !== null) {
          r4 = parse___();
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset) { return ":"; })(r1);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_semicolon() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        if (input.charCodeAt(pos) === 59) {
          r3 = ";";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\";\"");
          }
        }
        if (r3 !== null) {
          r4 = parse___();
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset) { return ";"; })(r1);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_slash() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        if (input.charCodeAt(pos) === 47) {
          r3 = "/";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"/\"");
          }
        }
        if (r3 !== null) {
          r4 = parse___();
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset) { return "/"; })(r1);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_and() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        if (input.charCodeAt(pos) === 38) {
          r3 = "&";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"&\"");
          }
        }
        if (r3 !== null) {
          r4 = parse___();
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset) { return "&"; })(r1);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_not() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        if (input.charCodeAt(pos) === 33) {
          r3 = "!";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"!\"");
          }
        }
        if (r3 !== null) {
          r4 = parse___();
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset) { return "!"; })(r1);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_question() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        if (input.charCodeAt(pos) === 63) {
          r3 = "?";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"?\"");
          }
        }
        if (r3 !== null) {
          r4 = parse___();
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset) { return "?"; })(r1);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_star() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        if (input.charCodeAt(pos) === 42) {
          r3 = "*";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"*\"");
          }
        }
        if (r3 !== null) {
          r4 = parse___();
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset) { return "*"; })(r1);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_plus() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        if (input.charCodeAt(pos) === 43) {
          r3 = "+";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"+\"");
          }
        }
        if (r3 !== null) {
          r4 = parse___();
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset) { return "+"; })(r1);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_lparen() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        if (input.charCodeAt(pos) === 40) {
          r3 = "(";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"(\"");
          }
        }
        if (r3 !== null) {
          r4 = parse___();
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset) { return "("; })(r1);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_rparen() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        if (input.charCodeAt(pos) === 41) {
          r3 = ")";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\")\"");
          }
        }
        if (r3 !== null) {
          r4 = parse___();
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset) { return ")"; })(r1);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_dot() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        if (input.charCodeAt(pos) === 46) {
          r3 = ".";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\".\"");
          }
        }
        if (r3 !== null) {
          r4 = parse___();
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset) { return "."; })(r1);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_identifier() {
        var r0, r1, r2, r3, r4, r5;
        
        reportFailures++;
        r1 = pos;
        r2 = pos;
        r3 = parse_letter();
        if (r3 === null) {
          if (input.charCodeAt(pos) === 95) {
            r3 = "_";
            pos++;
          } else {
            r3 = null;
            if (reportFailures === 0) {
              matchFailed("\"_\"");
            }
          }
          if (r3 === null) {
            if (input.charCodeAt(pos) === 36) {
              r3 = "$";
              pos++;
            } else {
              r3 = null;
              if (reportFailures === 0) {
                matchFailed("\"$\"");
              }
            }
          }
        }
        if (r3 !== null) {
          r4 = [];
          r5 = parse_letter();
          if (r5 === null) {
            r5 = parse_digit();
            if (r5 === null) {
              if (input.charCodeAt(pos) === 95) {
                r5 = "_";
                pos++;
              } else {
                r5 = null;
                if (reportFailures === 0) {
                  matchFailed("\"_\"");
                }
              }
              if (r5 === null) {
                if (input.charCodeAt(pos) === 36) {
                  r5 = "$";
                  pos++;
                } else {
                  r5 = null;
                  if (reportFailures === 0) {
                    matchFailed("\"$\"");
                  }
                }
              }
            }
          }
          while (r5 !== null) {
            r4.push(r5);
            r5 = parse_letter();
            if (r5 === null) {
              r5 = parse_digit();
              if (r5 === null) {
                if (input.charCodeAt(pos) === 95) {
                  r5 = "_";
                  pos++;
                } else {
                  r5 = null;
                  if (reportFailures === 0) {
                    matchFailed("\"_\"");
                  }
                }
                if (r5 === null) {
                  if (input.charCodeAt(pos) === 36) {
                    r5 = "$";
                    pos++;
                  } else {
                    r5 = null;
                    if (reportFailures === 0) {
                      matchFailed("\"$\"");
                    }
                  }
                }
              }
            }
          }
          if (r4 !== null) {
            r5 = parse___();
            if (r5 !== null) {
              r0 = [r3, r4, r5];
            } else {
              r0 = null;
              pos = r2;
            }
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, head, tail) {
              return head + tail.join("");
            })(r1, r3, r4);
        }
        if (r0 === null) {
          pos = r1;
        }
        reportFailures--;
        if (reportFailures === 0 && r0 === null) {
          matchFailed("identifier");
        }
        return r0;
      }
      
      function parse_literal() {
        var r0, r1, r2, r3, r4, r5;
        
        reportFailures++;
        r1 = pos;
        r2 = pos;
        r3 = parse_doubleQuotedString();
        if (r3 === null) {
          r3 = parse_singleQuotedString();
        }
        if (r3 !== null) {
          if (input.charCodeAt(pos) === 105) {
            r4 = "i";
            pos++;
          } else {
            r4 = null;
            if (reportFailures === 0) {
              matchFailed("\"i\"");
            }
          }
          r4 = r4 !== null ? r4 : "";
          if (r4 !== null) {
            r5 = parse___();
            if (r5 !== null) {
              r0 = [r3, r4, r5];
            } else {
              r0 = null;
              pos = r2;
            }
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, value, flags) {
              return {
                type:       "literal",
                value:      value,
                ignoreCase: flags === "i"
              };
            })(r1, r3, r4);
        }
        if (r0 === null) {
          pos = r1;
        }
        reportFailures--;
        if (reportFailures === 0 && r0 === null) {
          matchFailed("literal");
        }
        return r0;
      }
      
      function parse_string() {
        var r0, r1, r2, r3, r4;
        
        reportFailures++;
        r1 = pos;
        r2 = pos;
        r3 = parse_doubleQuotedString();
        if (r3 === null) {
          r3 = parse_singleQuotedString();
        }
        if (r3 !== null) {
          r4 = parse___();
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, string) { return string; })(r1, r3);
        }
        if (r0 === null) {
          pos = r1;
        }
        reportFailures--;
        if (reportFailures === 0 && r0 === null) {
          matchFailed("string");
        }
        return r0;
      }
      
      function parse_doubleQuotedString() {
        var r0, r1, r2, r3, r4, r5;
        
        r1 = pos;
        r2 = pos;
        if (input.charCodeAt(pos) === 34) {
          r3 = "\"";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"\\\"\"");
          }
        }
        if (r3 !== null) {
          r4 = [];
          r5 = parse_doubleQuotedCharacter();
          while (r5 !== null) {
            r4.push(r5);
            r5 = parse_doubleQuotedCharacter();
          }
          if (r4 !== null) {
            if (input.charCodeAt(pos) === 34) {
              r5 = "\"";
              pos++;
            } else {
              r5 = null;
              if (reportFailures === 0) {
                matchFailed("\"\\\"\"");
              }
            }
            if (r5 !== null) {
              r0 = [r3, r4, r5];
            } else {
              r0 = null;
              pos = r2;
            }
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, chars) { return chars.join(""); })(r1, r4);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_doubleQuotedCharacter() {
        var r0;
        
        r0 = parse_simpleDoubleQuotedCharacter();
        if (r0 === null) {
          r0 = parse_simpleEscapeSequence();
          if (r0 === null) {
            r0 = parse_zeroEscapeSequence();
            if (r0 === null) {
              r0 = parse_hexEscapeSequence();
              if (r0 === null) {
                r0 = parse_unicodeEscapeSequence();
                if (r0 === null) {
                  r0 = parse_eolEscapeSequence();
                }
              }
            }
          }
        }
        return r0;
      }
      
      function parse_simpleDoubleQuotedCharacter() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        r4 = pos;
        reportFailures++;
        if (input.charCodeAt(pos) === 34) {
          r3 = "\"";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"\\\"\"");
          }
        }
        if (r3 === null) {
          if (input.charCodeAt(pos) === 92) {
            r3 = "\\";
            pos++;
          } else {
            r3 = null;
            if (reportFailures === 0) {
              matchFailed("\"\\\\\"");
            }
          }
          if (r3 === null) {
            r3 = parse_eolChar();
          }
        }
        reportFailures--;
        if (r3 === null) {
          r3 = "";
        } else {
          r3 = null;
          pos = r4;
        }
        if (r3 !== null) {
          if (input.length > pos) {
            r4 = input.charAt(pos);
            pos++;
          } else {
            r4 = null;
            if (reportFailures === 0) {
              matchFailed("any character");
            }
          }
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, char_) { return char_; })(r1, r4);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_singleQuotedString() {
        var r0, r1, r2, r3, r4, r5;
        
        r1 = pos;
        r2 = pos;
        if (input.charCodeAt(pos) === 39) {
          r3 = "'";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"'\"");
          }
        }
        if (r3 !== null) {
          r4 = [];
          r5 = parse_singleQuotedCharacter();
          while (r5 !== null) {
            r4.push(r5);
            r5 = parse_singleQuotedCharacter();
          }
          if (r4 !== null) {
            if (input.charCodeAt(pos) === 39) {
              r5 = "'";
              pos++;
            } else {
              r5 = null;
              if (reportFailures === 0) {
                matchFailed("\"'\"");
              }
            }
            if (r5 !== null) {
              r0 = [r3, r4, r5];
            } else {
              r0 = null;
              pos = r2;
            }
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, chars) { return chars.join(""); })(r1, r4);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_singleQuotedCharacter() {
        var r0;
        
        r0 = parse_simpleSingleQuotedCharacter();
        if (r0 === null) {
          r0 = parse_simpleEscapeSequence();
          if (r0 === null) {
            r0 = parse_zeroEscapeSequence();
            if (r0 === null) {
              r0 = parse_hexEscapeSequence();
              if (r0 === null) {
                r0 = parse_unicodeEscapeSequence();
                if (r0 === null) {
                  r0 = parse_eolEscapeSequence();
                }
              }
            }
          }
        }
        return r0;
      }
      
      function parse_simpleSingleQuotedCharacter() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        r4 = pos;
        reportFailures++;
        if (input.charCodeAt(pos) === 39) {
          r3 = "'";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"'\"");
          }
        }
        if (r3 === null) {
          if (input.charCodeAt(pos) === 92) {
            r3 = "\\";
            pos++;
          } else {
            r3 = null;
            if (reportFailures === 0) {
              matchFailed("\"\\\\\"");
            }
          }
          if (r3 === null) {
            r3 = parse_eolChar();
          }
        }
        reportFailures--;
        if (r3 === null) {
          r3 = "";
        } else {
          r3 = null;
          pos = r4;
        }
        if (r3 !== null) {
          if (input.length > pos) {
            r4 = input.charAt(pos);
            pos++;
          } else {
            r4 = null;
            if (reportFailures === 0) {
              matchFailed("any character");
            }
          }
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, char_) { return char_; })(r1, r4);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_class() {
        var r0, r1, r2, r3, r4, r5, r6, r7, r8;
        
        reportFailures++;
        r1 = pos;
        r2 = pos;
        if (input.charCodeAt(pos) === 91) {
          r3 = "[";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"[\"");
          }
        }
        if (r3 !== null) {
          if (input.charCodeAt(pos) === 94) {
            r4 = "^";
            pos++;
          } else {
            r4 = null;
            if (reportFailures === 0) {
              matchFailed("\"^\"");
            }
          }
          r4 = r4 !== null ? r4 : "";
          if (r4 !== null) {
            r5 = [];
            r6 = parse_classCharacterRange();
            if (r6 === null) {
              r6 = parse_classCharacter();
            }
            while (r6 !== null) {
              r5.push(r6);
              r6 = parse_classCharacterRange();
              if (r6 === null) {
                r6 = parse_classCharacter();
              }
            }
            if (r5 !== null) {
              if (input.charCodeAt(pos) === 93) {
                r6 = "]";
                pos++;
              } else {
                r6 = null;
                if (reportFailures === 0) {
                  matchFailed("\"]\"");
                }
              }
              if (r6 !== null) {
                if (input.charCodeAt(pos) === 105) {
                  r7 = "i";
                  pos++;
                } else {
                  r7 = null;
                  if (reportFailures === 0) {
                    matchFailed("\"i\"");
                  }
                }
                r7 = r7 !== null ? r7 : "";
                if (r7 !== null) {
                  r8 = parse___();
                  if (r8 !== null) {
                    r0 = [r3, r4, r5, r6, r7, r8];
                  } else {
                    r0 = null;
                    pos = r2;
                  }
                } else {
                  r0 = null;
                  pos = r2;
                }
              } else {
                r0 = null;
                pos = r2;
              }
            } else {
              r0 = null;
              pos = r2;
            }
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, inverted, parts, flags) {
              var partsConverted = utils.map(parts, function(part) { return part.data; });
              var rawText = "["
                + inverted
                + utils.map(parts, function(part) { return part.rawText; }).join("")
                + "]"
                + flags;
        
              return {
                type:       "class",
                parts:      partsConverted,
                // FIXME: Get the raw text from the input directly.
                rawText:    rawText,
                inverted:   inverted === "^",
                ignoreCase: flags === "i"
              };
            })(r1, r4, r5, r7);
        }
        if (r0 === null) {
          pos = r1;
        }
        reportFailures--;
        if (reportFailures === 0 && r0 === null) {
          matchFailed("character class");
        }
        return r0;
      }
      
      function parse_classCharacterRange() {
        var r0, r1, r2, r3, r4, r5;
        
        r1 = pos;
        r2 = pos;
        r3 = parse_classCharacter();
        if (r3 !== null) {
          if (input.charCodeAt(pos) === 45) {
            r4 = "-";
            pos++;
          } else {
            r4 = null;
            if (reportFailures === 0) {
              matchFailed("\"-\"");
            }
          }
          if (r4 !== null) {
            r5 = parse_classCharacter();
            if (r5 !== null) {
              r0 = [r3, r4, r5];
            } else {
              r0 = null;
              pos = r2;
            }
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, 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
              };
            })(r1, r3, r5);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_classCharacter() {
        var r0, r1;
        
        r1 = pos;
        r0 = parse_bracketDelimitedCharacter();
        if (r0 !== null) {
          r0 = (function(offset, char_) {
              return {
                data:    char_,
                // FIXME: Get the raw text from the input directly.
                rawText: utils.quoteForRegexpClass(char_)
              };
            })(r1, r0);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_bracketDelimitedCharacter() {
        var r0;
        
        r0 = parse_simpleBracketDelimitedCharacter();
        if (r0 === null) {
          r0 = parse_simpleEscapeSequence();
          if (r0 === null) {
            r0 = parse_zeroEscapeSequence();
            if (r0 === null) {
              r0 = parse_hexEscapeSequence();
              if (r0 === null) {
                r0 = parse_unicodeEscapeSequence();
                if (r0 === null) {
                  r0 = parse_eolEscapeSequence();
                }
              }
            }
          }
        }
        return r0;
      }
      
      function parse_simpleBracketDelimitedCharacter() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        r4 = pos;
        reportFailures++;
        if (input.charCodeAt(pos) === 93) {
          r3 = "]";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"]\"");
          }
        }
        if (r3 === null) {
          if (input.charCodeAt(pos) === 92) {
            r3 = "\\";
            pos++;
          } else {
            r3 = null;
            if (reportFailures === 0) {
              matchFailed("\"\\\\\"");
            }
          }
          if (r3 === null) {
            r3 = parse_eolChar();
          }
        }
        reportFailures--;
        if (r3 === null) {
          r3 = "";
        } else {
          r3 = null;
          pos = r4;
        }
        if (r3 !== null) {
          if (input.length > pos) {
            r4 = input.charAt(pos);
            pos++;
          } else {
            r4 = null;
            if (reportFailures === 0) {
              matchFailed("any character");
            }
          }
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, char_) { return char_; })(r1, r4);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_simpleEscapeSequence() {
        var r0, r1, r2, r3, r4, r5;
        
        r1 = pos;
        r2 = pos;
        if (input.charCodeAt(pos) === 92) {
          r3 = "\\";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"\\\\\"");
          }
        }
        if (r3 !== null) {
          r5 = pos;
          reportFailures++;
          r4 = parse_digit();
          if (r4 === null) {
            if (input.charCodeAt(pos) === 120) {
              r4 = "x";
              pos++;
            } else {
              r4 = null;
              if (reportFailures === 0) {
                matchFailed("\"x\"");
              }
            }
            if (r4 === null) {
              if (input.charCodeAt(pos) === 117) {
                r4 = "u";
                pos++;
              } else {
                r4 = null;
                if (reportFailures === 0) {
                  matchFailed("\"u\"");
                }
              }
              if (r4 === null) {
                r4 = parse_eolChar();
              }
            }
          }
          reportFailures--;
          if (r4 === null) {
            r4 = "";
          } else {
            r4 = null;
            pos = r5;
          }
          if (r4 !== null) {
            if (input.length > pos) {
              r5 = input.charAt(pos);
              pos++;
            } else {
              r5 = null;
              if (reportFailures === 0) {
                matchFailed("any character");
              }
            }
            if (r5 !== null) {
              r0 = [r3, r4, r5];
            } else {
              r0 = null;
              pos = r2;
            }
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, 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".
            })(r1, r5);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_zeroEscapeSequence() {
        var r0, r1, r2, r3, r4, r5;
        
        r1 = pos;
        r2 = pos;
        if (input.substr(pos, 2) === "\\0") {
          r3 = "\\0";
          pos += 2;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"\\\\0\"");
          }
        }
        if (r3 !== null) {
          r5 = pos;
          reportFailures++;
          r4 = parse_digit();
          reportFailures--;
          if (r4 === null) {
            r4 = "";
          } else {
            r4 = null;
            pos = r5;
          }
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset) { return "\x00"; })(r1);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_hexEscapeSequence() {
        var r0, r1, r2, r3, r4, r5;
        
        r1 = pos;
        r2 = pos;
        if (input.substr(pos, 2) === "\\x") {
          r3 = "\\x";
          pos += 2;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"\\\\x\"");
          }
        }
        if (r3 !== null) {
          r4 = parse_hexDigit();
          if (r4 !== null) {
            r5 = parse_hexDigit();
            if (r5 !== null) {
              r0 = [r3, r4, r5];
            } else {
              r0 = null;
              pos = r2;
            }
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, h1, h2) {
              return String.fromCharCode(parseInt(h1 + h2, 16));
            })(r1, r4, r5);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_unicodeEscapeSequence() {
        var r0, r1, r2, r3, r4, r5, r6, r7;
        
        r1 = pos;
        r2 = pos;
        if (input.substr(pos, 2) === "\\u") {
          r3 = "\\u";
          pos += 2;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"\\\\u\"");
          }
        }
        if (r3 !== null) {
          r4 = parse_hexDigit();
          if (r4 !== null) {
            r5 = parse_hexDigit();
            if (r5 !== null) {
              r6 = parse_hexDigit();
              if (r6 !== null) {
                r7 = parse_hexDigit();
                if (r7 !== null) {
                  r0 = [r3, r4, r5, r6, r7];
                } else {
                  r0 = null;
                  pos = r2;
                }
              } else {
                r0 = null;
                pos = r2;
              }
            } else {
              r0 = null;
              pos = r2;
            }
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, h1, h2, h3, h4) {
              return String.fromCharCode(parseInt(h1 + h2 + h3 + h4, 16));
            })(r1, r4, r5, r6, r7);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_eolEscapeSequence() {
        var r0, r1, r2, r3, r4;
        
        r1 = pos;
        r2 = pos;
        if (input.charCodeAt(pos) === 92) {
          r3 = "\\";
          pos++;
        } else {
          r3 = null;
          if (reportFailures === 0) {
            matchFailed("\"\\\\\"");
          }
        }
        if (r3 !== null) {
          r4 = parse_eol();
          if (r4 !== null) {
            r0 = [r3, r4];
          } else {
            r0 = null;
            pos = r2;
          }
        } else {
          r0 = null;
          pos = r2;
        }
        if (r0 !== null) {
          r0 = (function(offset, eol) { return eol; })(r1, r4);
        }
        if (r0 === null) {
          pos = r1;
        }
        return r0;
      }
      
      function parse_digit() {
        var r0;
        
        if (/^[0-9]/.test(input.charAt(pos))) {
          r0 = input.charAt(pos);
          pos++;
        } else {
          r0 = null;
          if (reportFailures === 0) {
            matchFailed("[0-9]");
          }
        }
        return r0;
      }
      
      function parse_hexDigit() {
        var r0;
        
        if (/^[0-9a-fA-F]/.test(input.charAt(pos))) {
          r0 = input.charAt(pos);
          pos++;
        } else {
          r0 = null;
          if (reportFailures === 0) {
            matchFailed("[0-9a-fA-F]");
          }
        }
        return r0;
      }
      
      function parse_letter() {
        var r0;
        
        r0 = parse_lowerCaseLetter();
        if (r0 === null) {
          r0 = parse_upperCaseLetter();
        }
        return r0;
      }
      
      function parse_lowerCaseLetter() {
        var r0;
        
        if (/^[a-z]/.test(input.charAt(pos))) {
          r0 = input.charAt(pos);
          pos++;
        } else {
          r0 = null;
          if (reportFailures === 0) {
            matchFailed("[a-z]");
          }
        }
        return r0;
      }
      
      function parse_upperCaseLetter() {
        var r0;
        
        if (/^[A-Z]/.test(input.charAt(pos))) {
          r0 = input.charAt(pos);
          pos++;
        } else {
          r0 = null;
          if (reportFailures === 0) {
            matchFailed("[A-Z]");
          }
        }
        return r0;
      }
      
      function parse___() {
        var r0, r1;
        
        r0 = [];
        r1 = parse_whitespace();
        if (r1 === null) {
          r1 = parse_eol();
          if (r1 === null) {
            r1 = parse_comment();
          }
        }
        while (r1 !== null) {
          r0.push(r1);
          r1 = parse_whitespace();
          if (r1 === null) {
            r1 = parse_eol();
            if (r1 === null) {
              r1 = parse_comment();
            }
          }
        }
        return r0;
      }
      
      function parse_comment() {
        var r0;
        
        reportFailures++;
        r0 = parse_singleLineComment();
        if (r0 === null) {
          r0 = parse_multiLineComment();
        }
        reportFailures--;
        if (reportFailures === 0 && r0 === null) {
          matchFailed("comment");
        }
        return r0;
      }
      
      function parse_singleLineComment() {
        var r0, r1, r2, r3, r4, r5, r6, r7;
        
        r1 = pos;
        if (input.substr(pos, 2) === "//") {
          r2 = "//";
          pos += 2;
        } else {
          r2 = null;
          if (reportFailures === 0) {
            matchFailed("\"//\"");
          }
        }
        if (r2 !== null) {
          r3 = [];
          r5 = pos;
          r7 = pos;
          reportFailures++;
          r6 = parse_eolChar();
          reportFailures--;
          if (r6 === null) {
            r6 = "";
          } else {
            r6 = null;
            pos = r7;
          }
          if (r6 !== null) {
            if (input.length > pos) {
              r7 = input.charAt(pos);
              pos++;
            } else {
              r7 = null;
              if (reportFailures === 0) {
                matchFailed("any character");
              }
            }
            if (r7 !== null) {
              r4 = [r6, r7];
            } else {
              r4 = null;
              pos = r5;
            }
          } else {
            r4 = null;
            pos = r5;
          }
          while (r4 !== null) {
            r3.push(r4);
            r5 = pos;
            r7 = pos;
            reportFailures++;
            r6 = parse_eolChar();
            reportFailures--;
            if (r6 === null) {
              r6 = "";
            } else {
              r6 = null;
              pos = r7;
            }
            if (r6 !== null) {
              if (input.length > pos) {
                r7 = input.charAt(pos);
                pos++;
              } else {
                r7 = null;
                if (reportFailures === 0) {
                  matchFailed("any character");
                }
              }
              if (r7 !== null) {
                r4 = [r6, r7];
              } else {
                r4 = null;
                pos = r5;
              }
            } else {
              r4 = null;
              pos = r5;
            }
          }
          if (r3 !== null) {
            r0 = [r2, r3];
          } else {
            r0 = null;
            pos = r1;
          }
        } else {
          r0 = null;
          pos = r1;
        }
        return r0;
      }
      
      function parse_multiLineComment() {
        var r0, r1, r2, r3, r4, r5, r6, r7;
        
        r1 = pos;
        if (input.substr(pos, 2) === "/*") {
          r2 = "/*";
          pos += 2;
        } else {
          r2 = null;
          if (reportFailures === 0) {
            matchFailed("\"/*\"");
          }
        }
        if (r2 !== null) {
          r3 = [];
          r5 = pos;
          r7 = pos;
          reportFailures++;
          if (input.substr(pos, 2) === "*/") {
            r6 = "*/";
            pos += 2;
          } else {
            r6 = null;
            if (reportFailures === 0) {
              matchFailed("\"*/\"");
            }
          }
          reportFailures--;
          if (r6 === null) {
            r6 = "";
          } else {
            r6 = null;
            pos = r7;
          }
          if (r6 !== null) {
            if (input.length > pos) {
              r7 = input.charAt(pos);
              pos++;
            } else {
              r7 = null;
              if (reportFailures === 0) {
                matchFailed("any character");
              }
            }
            if (r7 !== null) {
              r4 = [r6, r7];
            } else {
              r4 = null;
              pos = r5;
            }
          } else {
            r4 = null;
            pos = r5;
          }
          while (r4 !== null) {
            r3.push(r4);
            r5 = pos;
            r7 = pos;
            reportFailures++;
            if (input.substr(pos, 2) === "*/") {
              r6 = "*/";
              pos += 2;
            } else {
              r6 = null;
              if (reportFailures === 0) {
                matchFailed("\"*/\"");
              }
            }
            reportFailures--;
            if (r6 === null) {
              r6 = "";
            } else {
              r6 = null;
              pos = r7;
            }
            if (r6 !== null) {
              if (input.length > pos) {
                r7 = input.charAt(pos);
                pos++;
              } else {
                r7 = null;
                if (reportFailures === 0) {
                  matchFailed("any character");
                }
              }
              if (r7 !== null) {
                r4 = [r6, r7];
              } else {
                r4 = null;
                pos = r5;
              }
            } else {
              r4 = null;
              pos = r5;
            }
          }
          if (r3 !== null) {
            if (input.substr(pos, 2) === "*/") {
              r4 = "*/";
              pos += 2;
            } else {
              r4 = null;
              if (reportFailures === 0) {
                matchFailed("\"*/\"");
              }
            }
            if (r4 !== null) {
              r0 = [r2, r3, r4];
            } else {
              r0 = null;
              pos = r1;
            }
          } else {
            r0 = null;
            pos = r1;
          }
        } else {
          r0 = null;
          pos = r1;
        }
        return r0;
      }
      
      function parse_eol() {
        var r0;
        
        reportFailures++;
        if (input.charCodeAt(pos) === 10) {
          r0 = "\n";
          pos++;
        } else {
          r0 = null;
          if (reportFailures === 0) {
            matchFailed("\"\\n\"");
          }
        }
        if (r0 === null) {
          if (input.substr(pos, 2) === "\r\n") {
            r0 = "\r\n";
            pos += 2;
          } else {
            r0 = null;
            if (reportFailures === 0) {
              matchFailed("\"\\r\\n\"");
            }
          }
          if (r0 === null) {
            if (input.charCodeAt(pos) === 13) {
              r0 = "\r";
              pos++;
            } else {
              r0 = null;
              if (reportFailures === 0) {
                matchFailed("\"\\r\"");
              }
            }
            if (r0 === null) {
              if (input.charCodeAt(pos) === 8232) {
                r0 = "\u2028";
                pos++;
              } else {
                r0 = null;
                if (reportFailures === 0) {
                  matchFailed("\"\\u2028\"");
                }
              }
              if (r0 === null) {
                if (input.charCodeAt(pos) === 8233) {
                  r0 = "\u2029";
                  pos++;
                } else {
                  r0 = null;
                  if (reportFailures === 0) {
                    matchFailed("\"\\u2029\"");
                  }
                }
              }
            }
          }
        }
        reportFailures--;
        if (reportFailures === 0 && r0 === null) {
          matchFailed("end of line");
        }
        return r0;
      }
      
      function parse_eolChar() {
        var r0;
        
        if (/^[\n\r\u2028\u2029]/.test(input.charAt(pos))) {
          r0 = input.charAt(pos);
          pos++;
        } else {
          r0 = null;
          if (reportFailures === 0) {
            matchFailed("[\\n\\r\\u2028\\u2029]");
          }
        }
        return r0;
      }
      
      function parse_whitespace() {
        var r0;
        
        reportFailures++;
        if (/^[ \t\x0B\f\xA0\uFEFF\u1680\u180E\u2000-\u200A\u202F\u205F\u3000]/.test(input.charAt(pos))) {
          r0 = input.charAt(pos);
          pos++;
        } else {
          r0 = null;
          if (reportFailures === 0) {
            matchFailed("[ \\t\\x0B\\f\\xA0\\uFEFF\\u1680\\u180E\\u2000-\\u200A\\u202F\\u205F\\u3000]");
          }
        }
        reportFailures--;
        if (reportFailures === 0 && r0 === null) {
          matchFailed("whitespace");
        }
        return r0;
      }
      
      
      function cleanupExpected(expected) {
        expected.sort();
        
        var lastExpected = null;
        var cleanExpected = [];
        for (var i = 0; i < expected.length; i++) {
          if (expected[i] !== lastExpected) {
            cleanExpected.push(expected[i]);
            lastExpected = expected[i];
          }
        }
        return cleanExpected;
      }
      
      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 < Math.max(pos, rightmostFailuresPos); 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 utils = require("./utils");
      
      
      var result = parseFunctions[startRule]();
      
      /*
       * The parser is now in one of the following three states:
       *
       * 1. The parser successfully parsed the whole input.
       *
       *    - |result !== null|
       *    - |pos === input.length|
       *    - |rightmostFailuresExpected| may or may not contain something
       *
       * 2. The parser successfully parsed only a part of the input.
       *
       *    - |result !== null|
       *    - |pos < input.length|
       *    - |rightmostFailuresExpected| may or may not contain something
       *
       * 3. The parser did not successfully parse any part of the input.
       *
       *   - |result === null|
       *   - |pos === 0|
       *   - |rightmostFailuresExpected| contains at least one failure
       *
       * All code following this comment (including called functions) must
       * handle these states.
       */
      if (result === null || pos !== input.length) {
        var offset = Math.max(pos, rightmostFailuresPos);
        var found = offset < input.length ? input.charAt(offset) : null;
        var errorPosition = computeErrorPosition();
        
        throw new this.SyntaxError(
          cleanupExpected(rightmostFailuresExpected),
          found,
          offset,
          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(expected, found, offset, line, column) {
    function buildMessage(expected, found) {
      var expectedHumanized, foundHumanized;
      
      switch (expected.length) {
        case 0:
          expectedHumanized = "end of input";
          break;
        case 1:
          expectedHumanized = expected[0];
          break;
        default:
          expectedHumanized = expected.slice(0, expected.length - 1).join(", ")
            + " or "
            + expected[expected.length - 1];
      }
      
      foundHumanized = found ? quote(found) : "end of input";
      
      return "Expected " + expectedHumanized + " but " + foundHumanized + " found.";
    }
    
    this.name = "SyntaxError";
    this.expected = expected;
    this.found = found;
    this.message = buildMessage(expected, found);
    this.offset = offset;
    this.line = line;
    this.column = column;
  };
  
  subclass(result.SyntaxError, Error);
  
  return result;
})();