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 SyntaxError(expected, found, offset, line, column) {
    function buildMessage(expected, found) {
      function stringEscape(s) {
        function hex(ch) { return ch.charCodeAt(0).toString(16).toUpperCase(); }

        return s
          .replace(/\\/g,   '\\\\')
          .replace(/"/g,    '\\"')
          .replace(/\x08/g, '\\b')
          .replace(/\t/g,   '\\t')
          .replace(/\n/g,   '\\n')
          .replace(/\f/g,   '\\f')
          .replace(/\r/g,   '\\r')
          .replace(/[\x00-\x07\x0B\x0E\x0F]/g, function(ch) { return '\\x0' + hex(ch); })
          .replace(/[\x10-\x1F\x80-\xFF]/g,    function(ch) { return '\\x'  + hex(ch); })
          .replace(/[\u0180-\u0FFF]/g,         function(ch) { return '\\u0' + hex(ch); })
          .replace(/[\u1080-\uFFFF]/g,         function(ch) { return '\\u'  + hex(ch); });
      }

      var expectedDesc, foundDesc;

      switch (expected.length) {
        case 0:
          expectedDesc = "end of input";
          break;

        case 1:
          expectedDesc = expected[0];
          break;

        default:
          expectedDesc = expected.slice(0, -1).join(", ")
            + " or "
            + expected[expected.length - 1];
      }

      foundDesc = found ? "\"" + stringEscape(found) + "\"" : "end of input";

      return "Expected " + expectedDesc + " but " + foundDesc + " found.";
    }

    this.expected = expected;
    this.found    = found;
    this.offset   = offset;
    this.line     = line;
    this.column   = column;

    this.name     = "SyntaxError";
    this.message  = buildMessage(expected, found);
  }

  subclass(SyntaxError, Error);

  function parse(input) {
    var options = arguments.length > 1 ? arguments[1] : {},

        peg$startRuleFunctions = { grammar: peg$parsegrammar },
        peg$startRuleFunction  = peg$parsegrammar,

        peg$c0 = null,
        peg$c1 = "",
        peg$c2 = [],
        peg$c3 = function(initializer, rules) {
              return {
                type:        "grammar",
                initializer: initializer !== "" ? initializer : null,
                rules:       rules,
                startRule:   rules[0].name
              };
            },
        peg$c4 = function(code) {
              return {
                type: "initializer",
                code: code
              };
            },
        peg$c5 = function(name, displayName, expression) {
              return {
                type:        "rule",
                name:        name,
                expression:  displayName !== ""
                  ? {
                      type:       "named",
                      name:       displayName,
                      expression: expression
                    }
                  : expression
              };
            },
        peg$c6 = function(head, tail) {
              if (tail.length > 0) {
                var alternatives = [head].concat(utils.map(
                    tail,
                    function(element) { return element[1]; }
                ));
                return {
                  type:         "choice",
                  alternatives: alternatives
                };
              } else {
                return head;
              }
            },
        peg$c7 = function(elements, code) {
              var expression = elements.length !== 1
                ? {
                    type:     "sequence",
                    elements: elements
                  }
                : elements[0];
              return {
                type:       "action",
                expression: expression,
                code:       code
              };
            },
        peg$c8 = function(elements) {
              return elements.length !== 1
                ? {
                    type:     "sequence",
                    elements: elements
                  }
                : elements[0];
            },
        peg$c9 = function(label, expression) {
              return {
                type:       "labeled",
                label:      label,
                expression: expression
              };
            },
        peg$c10 = function(expression) {
              return {
                type:       "text",
                expression: expression
              };
            },
        peg$c11 = function(code) {
              return {
                type: "semantic_and",
                code: code
              };
            },
        peg$c12 = function(expression) {
              return {
                type:       "simple_and",
                expression: expression
              };
            },
        peg$c13 = function(code) {
              return {
                type: "semantic_not",
                code: code
              };
            },
        peg$c14 = function(expression) {
              return {
                type:       "simple_not",
                expression: expression
              };
            },
        peg$c15 = function(expression) {
              return {
                type:       "optional",
                expression: expression
              };
            },
        peg$c16 = function(expression) {
              return {
                type:       "zero_or_more",
                expression: expression
              };
            },
        peg$c17 = function(expression) {
              return {
                type:       "one_or_more",
                expression: expression
              };
            },
        peg$c18 = function(name) {
              return {
                type: "rule_ref",
                name: name
              };
            },
        peg$c19 = function() { return { type: "any" }; },
        peg$c20 = function(expression) { return expression; },
        peg$c21 = "action",
        peg$c22 = function(braced) { return braced.substr(1, braced.length - 2); },
        peg$c23 = "{",
        peg$c24 = "\"{\"",
        peg$c25 = "}",
        peg$c26 = "\"}\"",
        peg$c27 = /^[^{}]/,
        peg$c28 = "[^{}]",
        peg$c29 = "=",
        peg$c30 = "\"=\"",
        peg$c31 = function() { return "="; },
        peg$c32 = ":",
        peg$c33 = "\":\"",
        peg$c34 = function() { return ":"; },
        peg$c35 = ";",
        peg$c36 = "\";\"",
        peg$c37 = function() { return ";"; },
        peg$c38 = "/",
        peg$c39 = "\"/\"",
        peg$c40 = function() { return "/"; },
        peg$c41 = "&",
        peg$c42 = "\"&\"",
        peg$c43 = function() { return "&"; },
        peg$c44 = "!",
        peg$c45 = "\"!\"",
        peg$c46 = function() { return "!"; },
        peg$c47 = "$",
        peg$c48 = "\"$\"",
        peg$c49 = function() { return "$"; },
        peg$c50 = "?",
        peg$c51 = "\"?\"",
        peg$c52 = function() { return "?"; },
        peg$c53 = "*",
        peg$c54 = "\"*\"",
        peg$c55 = function() { return "*"; },
        peg$c56 = "+",
        peg$c57 = "\"+\"",
        peg$c58 = function() { return "+"; },
        peg$c59 = "(",
        peg$c60 = "\"(\"",
        peg$c61 = function() { return "("; },
        peg$c62 = ")",
        peg$c63 = "\")\"",
        peg$c64 = function() { return ")"; },
        peg$c65 = ".",
        peg$c66 = "\".\"",
        peg$c67 = function() { return "."; },
        peg$c68 = "identifier",
        peg$c69 = "_",
        peg$c70 = "\"_\"",
        peg$c71 = function(chars) { return chars; },
        peg$c72 = "literal",
        peg$c73 = "i",
        peg$c74 = "\"i\"",
        peg$c75 = function(value, flags) {
              return {
                type:       "literal",
                value:      value,
                ignoreCase: flags === "i"
              };
            },
        peg$c76 = "string",
        peg$c77 = function(string) { return string; },
        peg$c78 = "\"",
        peg$c79 = "\"\\\"\"",
        peg$c80 = function(chars) { return chars.join(""); },
        peg$c81 = "\\",
        peg$c82 = "\"\\\\\"",
        peg$c83 = "any character",
        peg$c84 = function(char_) { return char_; },
        peg$c85 = "'",
        peg$c86 = "\"'\"",
        peg$c87 = "character class",
        peg$c88 = "[",
        peg$c89 = "\"[\"",
        peg$c90 = "^",
        peg$c91 = "\"^\"",
        peg$c92 = "]",
        peg$c93 = "\"]\"",
        peg$c94 = function(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"
              };
            },
        peg$c95 = "-",
        peg$c96 = "\"-\"",
        peg$c97 = 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
              };
            },
        peg$c98 = function(char_) {
              return {
                data:    char_,
                // FIXME: Get the raw text from the input directly.
                rawText: utils.quoteForRegexpClass(char_)
              };
            },
        peg$c99 = "x",
        peg$c100 = "\"x\"",
        peg$c101 = "u",
        peg$c102 = "\"u\"",
        peg$c103 = 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".
            },
        peg$c104 = "\\0",
        peg$c105 = "\"\\\\0\"",
        peg$c106 = function() { return "\x00"; },
        peg$c107 = "\\x",
        peg$c108 = "\"\\\\x\"",
        peg$c109 = function(digits) {
              return String.fromCharCode(parseInt(digits, 16));
            },
        peg$c110 = "\\u",
        peg$c111 = "\"\\\\u\"",
        peg$c112 = function(eol) { return eol; },
        peg$c113 = /^[0-9]/,
        peg$c114 = "[0-9]",
        peg$c115 = /^[0-9a-fA-F]/,
        peg$c116 = "[0-9a-fA-F]",
        peg$c117 = /^[a-z]/,
        peg$c118 = "[a-z]",
        peg$c119 = /^[A-Z]/,
        peg$c120 = "[A-Z]",
        peg$c121 = "comment",
        peg$c122 = "//",
        peg$c123 = "\"//\"",
        peg$c124 = "/*",
        peg$c125 = "\"/*\"",
        peg$c126 = "*/",
        peg$c127 = "\"*/\"",
        peg$c128 = "end of line",
        peg$c129 = "\n",
        peg$c130 = "\"\\n\"",
        peg$c131 = "\r\n",
        peg$c132 = "\"\\r\\n\"",
        peg$c133 = "\r",
        peg$c134 = "\"\\r\"",
        peg$c135 = "\u2028",
        peg$c136 = "\"\\u2028\"",
        peg$c137 = "\u2029",
        peg$c138 = "\"\\u2029\"",
        peg$c139 = /^[\n\r\u2028\u2029]/,
        peg$c140 = "[\\n\\r\\u2028\\u2029]",
        peg$c141 = "whitespace",
        peg$c142 = /^[ \t\x0B\f\xA0\uFEFF\u1680\u180E\u2000-\u200A\u202F\u205F\u3000]/,
        peg$c143 = "[ \\t\\x0B\\f\\xA0\\uFEFF\\u1680\\u180E\\u2000-\\u200A\\u202F\\u205F\\u3000]",

        peg$currPos          = 0,
        peg$reportedPos      = 0,
        peg$cachedPos        = 0,
        peg$cachedPosDetails = { line: 1, column: 1, seenCR: false },
        peg$maxFailPos       = 0,
        peg$maxFailExpected  = [],
        peg$silentFails      = 0,

        peg$result;

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

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

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

    function offset() {
      return peg$reportedPos;
    }

    function line() {
      return peg$computePosDetails(peg$reportedPos).line;
    }

    function column() {
      return peg$computePosDetails(peg$reportedPos).column;
    }

    function peg$computePosDetails(pos) {
      function advance(details, pos) {
        var p, ch;

        for (p = 0; p < pos; p++) {
          ch = input.charAt(p);
          if (ch === "\n") {
            if (!details.seenCR) { details.line++; }
            details.column = 1;
            details.seenCR = false;
          } else if (ch === "\r" || ch === "\u2028" || ch === "\u2029") {
            details.line++;
            details.column = 1;
            details.seenCR = true;
          } else {
            details.column++;
            details.seenCR = false;
          }
        }
      }

      if (peg$cachedPos !== pos) {
        if (peg$cachedPos > pos) {
          peg$cachedPos = 0;
          peg$cachedPosDetails = { line: 1, column: 1, seenCR: false };
        }
        peg$cachedPos = pos;
        advance(peg$cachedPosDetails, peg$cachedPos);
      }

      return peg$cachedPosDetails;
    }

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

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

      peg$maxFailExpected.push(expected);
    }

    function peg$cleanupExpected(expected) {
      var i;

      expected.sort();

      for (i = 1; i < expected.length; i++) {
        if (expected[i - 1] === expected[i]) {
          expected.splice(i, 1);
        }
      }
    }

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

      s0 = peg$currPos;
      s1 = peg$parse__();
      if (s1 !== null) {
        s2 = peg$parseinitializer();
        if (s2 === null) {
          s2 = peg$c1;
        }
        if (s2 !== null) {
          s3 = [];
          s4 = peg$parserule();
          if (s4 !== null) {
            while (s4 !== null) {
              s3.push(s4);
              s4 = peg$parserule();
            }
          } else {
            s3 = peg$c0;
          }
          if (s3 !== null) {
            peg$reportedPos = s0;
            s1 = peg$c3(s2,s3);
            if (s1 === null) {
              peg$currPos = s0;
              s0 = s1;
            } else {
              s0 = s1;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$c0;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      s1 = peg$parseaction();
      if (s1 !== null) {
        s2 = peg$parsesemicolon();
        if (s2 === null) {
          s2 = peg$c1;
        }
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c4(s1);
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      s1 = peg$parseidentifier();
      if (s1 !== null) {
        s2 = peg$parsestring();
        if (s2 === null) {
          s2 = peg$c1;
        }
        if (s2 !== null) {
          s3 = peg$parseequals();
          if (s3 !== null) {
            s4 = peg$parsechoice();
            if (s4 !== null) {
              s5 = peg$parsesemicolon();
              if (s5 === null) {
                s5 = peg$c1;
              }
              if (s5 !== null) {
                peg$reportedPos = s0;
                s1 = peg$c5(s1,s2,s4);
                if (s1 === null) {
                  peg$currPos = s0;
                  s0 = s1;
                } else {
                  s0 = s1;
                }
              } else {
                peg$currPos = s0;
                s0 = peg$c0;
              }
            } else {
              peg$currPos = s0;
              s0 = peg$c0;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$c0;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      s1 = peg$parsesequence();
      if (s1 !== null) {
        s2 = [];
        s3 = peg$currPos;
        s4 = peg$parseslash();
        if (s4 !== null) {
          s5 = peg$parsesequence();
          if (s5 !== null) {
            s4 = [s4, s5];
            s3 = s4;
          } else {
            peg$currPos = s3;
            s3 = peg$c0;
          }
        } else {
          peg$currPos = s3;
          s3 = peg$c0;
        }
        while (s3 !== null) {
          s2.push(s3);
          s3 = peg$currPos;
          s4 = peg$parseslash();
          if (s4 !== null) {
            s5 = peg$parsesequence();
            if (s5 !== null) {
              s4 = [s4, s5];
              s3 = s4;
            } else {
              peg$currPos = s3;
              s3 = peg$c0;
            }
          } else {
            peg$currPos = s3;
            s3 = peg$c0;
          }
        }
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c6(s1,s2);
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      s1 = [];
      s2 = peg$parselabeled();
      while (s2 !== null) {
        s1.push(s2);
        s2 = peg$parselabeled();
      }
      if (s1 !== null) {
        s2 = peg$parseaction();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c7(s1,s2);
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }
      if (s0 === null) {
        s0 = peg$currPos;
        s1 = [];
        s2 = peg$parselabeled();
        while (s2 !== null) {
          s1.push(s2);
          s2 = peg$parselabeled();
        }
        if (s1 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c8(s1);
        }
        if (s1 === null) {
          peg$currPos = s0;
          s0 = s1;
        } else {
          s0 = s1;
        }
      }

      return s0;
    }

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

      s0 = peg$currPos;
      s1 = peg$parseidentifier();
      if (s1 !== null) {
        s2 = peg$parsecolon();
        if (s2 !== null) {
          s3 = peg$parseprefixed();
          if (s3 !== null) {
            peg$reportedPos = s0;
            s1 = peg$c9(s1,s3);
            if (s1 === null) {
              peg$currPos = s0;
              s0 = s1;
            } else {
              s0 = s1;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$c0;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }
      if (s0 === null) {
        s0 = peg$parseprefixed();
      }

      return s0;
    }

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

      s0 = peg$currPos;
      s1 = peg$parsedollar();
      if (s1 !== null) {
        s2 = peg$parsesuffixed();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c10(s2);
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }
      if (s0 === null) {
        s0 = peg$currPos;
        s1 = peg$parseand();
        if (s1 !== null) {
          s2 = peg$parseaction();
          if (s2 !== null) {
            peg$reportedPos = s0;
            s1 = peg$c11(s2);
            if (s1 === null) {
              peg$currPos = s0;
              s0 = s1;
            } else {
              s0 = s1;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$c0;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
        if (s0 === null) {
          s0 = peg$currPos;
          s1 = peg$parseand();
          if (s1 !== null) {
            s2 = peg$parsesuffixed();
            if (s2 !== null) {
              peg$reportedPos = s0;
              s1 = peg$c12(s2);
              if (s1 === null) {
                peg$currPos = s0;
                s0 = s1;
              } else {
                s0 = s1;
              }
            } else {
              peg$currPos = s0;
              s0 = peg$c0;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$c0;
          }
          if (s0 === null) {
            s0 = peg$currPos;
            s1 = peg$parsenot();
            if (s1 !== null) {
              s2 = peg$parseaction();
              if (s2 !== null) {
                peg$reportedPos = s0;
                s1 = peg$c13(s2);
                if (s1 === null) {
                  peg$currPos = s0;
                  s0 = s1;
                } else {
                  s0 = s1;
                }
              } else {
                peg$currPos = s0;
                s0 = peg$c0;
              }
            } else {
              peg$currPos = s0;
              s0 = peg$c0;
            }
            if (s0 === null) {
              s0 = peg$currPos;
              s1 = peg$parsenot();
              if (s1 !== null) {
                s2 = peg$parsesuffixed();
                if (s2 !== null) {
                  peg$reportedPos = s0;
                  s1 = peg$c14(s2);
                  if (s1 === null) {
                    peg$currPos = s0;
                    s0 = s1;
                  } else {
                    s0 = s1;
                  }
                } else {
                  peg$currPos = s0;
                  s0 = peg$c0;
                }
              } else {
                peg$currPos = s0;
                s0 = peg$c0;
              }
              if (s0 === null) {
                s0 = peg$parsesuffixed();
              }
            }
          }
        }
      }

      return s0;
    }

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

      s0 = peg$currPos;
      s1 = peg$parseprimary();
      if (s1 !== null) {
        s2 = peg$parsequestion();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c15(s1);
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }
      if (s0 === null) {
        s0 = peg$currPos;
        s1 = peg$parseprimary();
        if (s1 !== null) {
          s2 = peg$parsestar();
          if (s2 !== null) {
            peg$reportedPos = s0;
            s1 = peg$c16(s1);
            if (s1 === null) {
              peg$currPos = s0;
              s0 = s1;
            } else {
              s0 = s1;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$c0;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
        if (s0 === null) {
          s0 = peg$currPos;
          s1 = peg$parseprimary();
          if (s1 !== null) {
            s2 = peg$parseplus();
            if (s2 !== null) {
              peg$reportedPos = s0;
              s1 = peg$c17(s1);
              if (s1 === null) {
                peg$currPos = s0;
                s0 = s1;
              } else {
                s0 = s1;
              }
            } else {
              peg$currPos = s0;
              s0 = peg$c0;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$c0;
          }
          if (s0 === null) {
            s0 = peg$parseprimary();
          }
        }
      }

      return s0;
    }

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

      s0 = peg$currPos;
      s1 = peg$parseidentifier();
      if (s1 !== null) {
        s2 = peg$currPos;
        peg$silentFails++;
        s3 = peg$currPos;
        s4 = peg$parsestring();
        if (s4 === null) {
          s4 = peg$c1;
        }
        if (s4 !== null) {
          s5 = peg$parseequals();
          if (s5 !== null) {
            s4 = [s4, s5];
            s3 = s4;
          } else {
            peg$currPos = s3;
            s3 = peg$c0;
          }
        } else {
          peg$currPos = s3;
          s3 = peg$c0;
        }
        peg$silentFails--;
        if (s3 === null) {
          s2 = peg$c1;
        } else {
          peg$currPos = s2;
          s2 = peg$c0;
        }
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c18(s1);
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }
      if (s0 === null) {
        s0 = peg$parseliteral();
        if (s0 === null) {
          s0 = peg$parseclass();
          if (s0 === null) {
            s0 = peg$currPos;
            s1 = peg$parsedot();
            if (s1 !== null) {
              peg$reportedPos = s0;
              s1 = peg$c19();
            }
            if (s1 === null) {
              peg$currPos = s0;
              s0 = s1;
            } else {
              s0 = s1;
            }
            if (s0 === null) {
              s0 = peg$currPos;
              s1 = peg$parselparen();
              if (s1 !== null) {
                s2 = peg$parsechoice();
                if (s2 !== null) {
                  s3 = peg$parserparen();
                  if (s3 !== null) {
                    peg$reportedPos = s0;
                    s1 = peg$c20(s2);
                    if (s1 === null) {
                      peg$currPos = s0;
                      s0 = s1;
                    } else {
                      s0 = s1;
                    }
                  } else {
                    peg$currPos = s0;
                    s0 = peg$c0;
                  }
                } else {
                  peg$currPos = s0;
                  s0 = peg$c0;
                }
              } else {
                peg$currPos = s0;
                s0 = peg$c0;
              }
            }
          }
        }
      }

      return s0;
    }

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

      peg$silentFails++;
      s0 = peg$currPos;
      s1 = peg$parsebraced();
      if (s1 !== null) {
        s2 = peg$parse__();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c22(s1);
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }
      peg$silentFails--;
      if (s0 === null) {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c21); }
      }

      return s0;
    }

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

      s0 = peg$currPos;
      s1 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 123) {
        s2 = peg$c23;
        peg$currPos++;
      } else {
        s2 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c24); }
      }
      if (s2 !== null) {
        s3 = [];
        s4 = peg$parsebraced();
        if (s4 === null) {
          s4 = peg$parsenonBraceCharacters();
        }
        while (s4 !== null) {
          s3.push(s4);
          s4 = peg$parsebraced();
          if (s4 === null) {
            s4 = peg$parsenonBraceCharacters();
          }
        }
        if (s3 !== null) {
          if (input.charCodeAt(peg$currPos) === 125) {
            s4 = peg$c25;
            peg$currPos++;
          } else {
            s4 = null;
            if (peg$silentFails === 0) { peg$fail(peg$c26); }
          }
          if (s4 !== null) {
            s2 = [s2, s3, s4];
            s1 = s2;
          } else {
            peg$currPos = s1;
            s1 = peg$c0;
          }
        } else {
          peg$currPos = s1;
          s1 = peg$c0;
        }
      } else {
        peg$currPos = s1;
        s1 = peg$c0;
      }
      if (s1 !== null) {
        s1 = input.substring(s0, peg$currPos);
      }
      s0 = s1;

      return s0;
    }

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

      s0 = [];
      s1 = peg$parsenonBraceCharacter();
      if (s1 !== null) {
        while (s1 !== null) {
          s0.push(s1);
          s1 = peg$parsenonBraceCharacter();
        }
      } else {
        s0 = peg$c0;
      }

      return s0;
    }

    function peg$parsenonBraceCharacter() {
      var s0;

      if (peg$c27.test(input.charAt(peg$currPos))) {
        s0 = input.charAt(peg$currPos);
        peg$currPos++;
      } else {
        s0 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c28); }
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 61) {
        s1 = peg$c29;
        peg$currPos++;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c30); }
      }
      if (s1 !== null) {
        s2 = peg$parse__();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c31();
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 58) {
        s1 = peg$c32;
        peg$currPos++;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c33); }
      }
      if (s1 !== null) {
        s2 = peg$parse__();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c34();
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 59) {
        s1 = peg$c35;
        peg$currPos++;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c36); }
      }
      if (s1 !== null) {
        s2 = peg$parse__();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c37();
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 47) {
        s1 = peg$c38;
        peg$currPos++;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c39); }
      }
      if (s1 !== null) {
        s2 = peg$parse__();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c40();
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 38) {
        s1 = peg$c41;
        peg$currPos++;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c42); }
      }
      if (s1 !== null) {
        s2 = peg$parse__();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c43();
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 33) {
        s1 = peg$c44;
        peg$currPos++;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c45); }
      }
      if (s1 !== null) {
        s2 = peg$parse__();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c46();
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 36) {
        s1 = peg$c47;
        peg$currPos++;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c48); }
      }
      if (s1 !== null) {
        s2 = peg$parse__();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c49();
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 63) {
        s1 = peg$c50;
        peg$currPos++;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c51); }
      }
      if (s1 !== null) {
        s2 = peg$parse__();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c52();
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 42) {
        s1 = peg$c53;
        peg$currPos++;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c54); }
      }
      if (s1 !== null) {
        s2 = peg$parse__();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c55();
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 43) {
        s1 = peg$c56;
        peg$currPos++;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c57); }
      }
      if (s1 !== null) {
        s2 = peg$parse__();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c58();
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 40) {
        s1 = peg$c59;
        peg$currPos++;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c60); }
      }
      if (s1 !== null) {
        s2 = peg$parse__();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c61();
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 41) {
        s1 = peg$c62;
        peg$currPos++;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c63); }
      }
      if (s1 !== null) {
        s2 = peg$parse__();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c64();
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 46) {
        s1 = peg$c65;
        peg$currPos++;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c66); }
      }
      if (s1 !== null) {
        s2 = peg$parse__();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c67();
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      peg$silentFails++;
      s0 = peg$currPos;
      s1 = peg$currPos;
      s2 = peg$currPos;
      s3 = peg$parseletter();
      if (s3 === null) {
        if (input.charCodeAt(peg$currPos) === 95) {
          s3 = peg$c69;
          peg$currPos++;
        } else {
          s3 = null;
          if (peg$silentFails === 0) { peg$fail(peg$c70); }
        }
      }
      if (s3 !== null) {
        s4 = [];
        s5 = peg$parseletter();
        if (s5 === null) {
          s5 = peg$parsedigit();
          if (s5 === null) {
            if (input.charCodeAt(peg$currPos) === 95) {
              s5 = peg$c69;
              peg$currPos++;
            } else {
              s5 = null;
              if (peg$silentFails === 0) { peg$fail(peg$c70); }
            }
          }
        }
        while (s5 !== null) {
          s4.push(s5);
          s5 = peg$parseletter();
          if (s5 === null) {
            s5 = peg$parsedigit();
            if (s5 === null) {
              if (input.charCodeAt(peg$currPos) === 95) {
                s5 = peg$c69;
                peg$currPos++;
              } else {
                s5 = null;
                if (peg$silentFails === 0) { peg$fail(peg$c70); }
              }
            }
          }
        }
        if (s4 !== null) {
          s3 = [s3, s4];
          s2 = s3;
        } else {
          peg$currPos = s2;
          s2 = peg$c0;
        }
      } else {
        peg$currPos = s2;
        s2 = peg$c0;
      }
      if (s2 !== null) {
        s2 = input.substring(s1, peg$currPos);
      }
      s1 = s2;
      if (s1 !== null) {
        s2 = peg$parse__();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c71(s1);
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }
      peg$silentFails--;
      if (s0 === null) {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c68); }
      }

      return s0;
    }

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

      peg$silentFails++;
      s0 = peg$currPos;
      s1 = peg$parsedoubleQuotedString();
      if (s1 === null) {
        s1 = peg$parsesingleQuotedString();
      }
      if (s1 !== null) {
        if (input.charCodeAt(peg$currPos) === 105) {
          s2 = peg$c73;
          peg$currPos++;
        } else {
          s2 = null;
          if (peg$silentFails === 0) { peg$fail(peg$c74); }
        }
        if (s2 === null) {
          s2 = peg$c1;
        }
        if (s2 !== null) {
          s3 = peg$parse__();
          if (s3 !== null) {
            peg$reportedPos = s0;
            s1 = peg$c75(s1,s2);
            if (s1 === null) {
              peg$currPos = s0;
              s0 = s1;
            } else {
              s0 = s1;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$c0;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }
      peg$silentFails--;
      if (s0 === null) {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c72); }
      }

      return s0;
    }

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

      peg$silentFails++;
      s0 = peg$currPos;
      s1 = peg$parsedoubleQuotedString();
      if (s1 === null) {
        s1 = peg$parsesingleQuotedString();
      }
      if (s1 !== null) {
        s2 = peg$parse__();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c77(s1);
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }
      peg$silentFails--;
      if (s0 === null) {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c76); }
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 34) {
        s1 = peg$c78;
        peg$currPos++;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c79); }
      }
      if (s1 !== null) {
        s2 = [];
        s3 = peg$parsedoubleQuotedCharacter();
        while (s3 !== null) {
          s2.push(s3);
          s3 = peg$parsedoubleQuotedCharacter();
        }
        if (s2 !== null) {
          if (input.charCodeAt(peg$currPos) === 34) {
            s3 = peg$c78;
            peg$currPos++;
          } else {
            s3 = null;
            if (peg$silentFails === 0) { peg$fail(peg$c79); }
          }
          if (s3 !== null) {
            peg$reportedPos = s0;
            s1 = peg$c80(s2);
            if (s1 === null) {
              peg$currPos = s0;
              s0 = s1;
            } else {
              s0 = s1;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$c0;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

    function peg$parsedoubleQuotedCharacter() {
      var s0;

      s0 = peg$parsesimpleDoubleQuotedCharacter();
      if (s0 === null) {
        s0 = peg$parsesimpleEscapeSequence();
        if (s0 === null) {
          s0 = peg$parsezeroEscapeSequence();
          if (s0 === null) {
            s0 = peg$parsehexEscapeSequence();
            if (s0 === null) {
              s0 = peg$parseunicodeEscapeSequence();
              if (s0 === null) {
                s0 = peg$parseeolEscapeSequence();
              }
            }
          }
        }
      }

      return s0;
    }

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

      s0 = peg$currPos;
      s1 = peg$currPos;
      peg$silentFails++;
      if (input.charCodeAt(peg$currPos) === 34) {
        s2 = peg$c78;
        peg$currPos++;
      } else {
        s2 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c79); }
      }
      if (s2 === null) {
        if (input.charCodeAt(peg$currPos) === 92) {
          s2 = peg$c81;
          peg$currPos++;
        } else {
          s2 = null;
          if (peg$silentFails === 0) { peg$fail(peg$c82); }
        }
        if (s2 === null) {
          s2 = peg$parseeolChar();
        }
      }
      peg$silentFails--;
      if (s2 === null) {
        s1 = peg$c1;
      } else {
        peg$currPos = s1;
        s1 = peg$c0;
      }
      if (s1 !== null) {
        if (input.length > peg$currPos) {
          s2 = input.charAt(peg$currPos);
          peg$currPos++;
        } else {
          s2 = null;
          if (peg$silentFails === 0) { peg$fail(peg$c83); }
        }
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c84(s2);
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 39) {
        s1 = peg$c85;
        peg$currPos++;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c86); }
      }
      if (s1 !== null) {
        s2 = [];
        s3 = peg$parsesingleQuotedCharacter();
        while (s3 !== null) {
          s2.push(s3);
          s3 = peg$parsesingleQuotedCharacter();
        }
        if (s2 !== null) {
          if (input.charCodeAt(peg$currPos) === 39) {
            s3 = peg$c85;
            peg$currPos++;
          } else {
            s3 = null;
            if (peg$silentFails === 0) { peg$fail(peg$c86); }
          }
          if (s3 !== null) {
            peg$reportedPos = s0;
            s1 = peg$c80(s2);
            if (s1 === null) {
              peg$currPos = s0;
              s0 = s1;
            } else {
              s0 = s1;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$c0;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

    function peg$parsesingleQuotedCharacter() {
      var s0;

      s0 = peg$parsesimpleSingleQuotedCharacter();
      if (s0 === null) {
        s0 = peg$parsesimpleEscapeSequence();
        if (s0 === null) {
          s0 = peg$parsezeroEscapeSequence();
          if (s0 === null) {
            s0 = peg$parsehexEscapeSequence();
            if (s0 === null) {
              s0 = peg$parseunicodeEscapeSequence();
              if (s0 === null) {
                s0 = peg$parseeolEscapeSequence();
              }
            }
          }
        }
      }

      return s0;
    }

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

      s0 = peg$currPos;
      s1 = peg$currPos;
      peg$silentFails++;
      if (input.charCodeAt(peg$currPos) === 39) {
        s2 = peg$c85;
        peg$currPos++;
      } else {
        s2 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c86); }
      }
      if (s2 === null) {
        if (input.charCodeAt(peg$currPos) === 92) {
          s2 = peg$c81;
          peg$currPos++;
        } else {
          s2 = null;
          if (peg$silentFails === 0) { peg$fail(peg$c82); }
        }
        if (s2 === null) {
          s2 = peg$parseeolChar();
        }
      }
      peg$silentFails--;
      if (s2 === null) {
        s1 = peg$c1;
      } else {
        peg$currPos = s1;
        s1 = peg$c0;
      }
      if (s1 !== null) {
        if (input.length > peg$currPos) {
          s2 = input.charAt(peg$currPos);
          peg$currPos++;
        } else {
          s2 = null;
          if (peg$silentFails === 0) { peg$fail(peg$c83); }
        }
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c84(s2);
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      peg$silentFails++;
      s0 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 91) {
        s1 = peg$c88;
        peg$currPos++;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c89); }
      }
      if (s1 !== null) {
        if (input.charCodeAt(peg$currPos) === 94) {
          s2 = peg$c90;
          peg$currPos++;
        } else {
          s2 = null;
          if (peg$silentFails === 0) { peg$fail(peg$c91); }
        }
        if (s2 === null) {
          s2 = peg$c1;
        }
        if (s2 !== null) {
          s3 = [];
          s4 = peg$parseclassCharacterRange();
          if (s4 === null) {
            s4 = peg$parseclassCharacter();
          }
          while (s4 !== null) {
            s3.push(s4);
            s4 = peg$parseclassCharacterRange();
            if (s4 === null) {
              s4 = peg$parseclassCharacter();
            }
          }
          if (s3 !== null) {
            if (input.charCodeAt(peg$currPos) === 93) {
              s4 = peg$c92;
              peg$currPos++;
            } else {
              s4 = null;
              if (peg$silentFails === 0) { peg$fail(peg$c93); }
            }
            if (s4 !== null) {
              if (input.charCodeAt(peg$currPos) === 105) {
                s5 = peg$c73;
                peg$currPos++;
              } else {
                s5 = null;
                if (peg$silentFails === 0) { peg$fail(peg$c74); }
              }
              if (s5 === null) {
                s5 = peg$c1;
              }
              if (s5 !== null) {
                s6 = peg$parse__();
                if (s6 !== null) {
                  peg$reportedPos = s0;
                  s1 = peg$c94(s2,s3,s5);
                  if (s1 === null) {
                    peg$currPos = s0;
                    s0 = s1;
                  } else {
                    s0 = s1;
                  }
                } else {
                  peg$currPos = s0;
                  s0 = peg$c0;
                }
              } else {
                peg$currPos = s0;
                s0 = peg$c0;
              }
            } else {
              peg$currPos = s0;
              s0 = peg$c0;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$c0;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }
      peg$silentFails--;
      if (s0 === null) {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c87); }
      }

      return s0;
    }

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

      s0 = peg$currPos;
      s1 = peg$parseclassCharacter();
      if (s1 !== null) {
        if (input.charCodeAt(peg$currPos) === 45) {
          s2 = peg$c95;
          peg$currPos++;
        } else {
          s2 = null;
          if (peg$silentFails === 0) { peg$fail(peg$c96); }
        }
        if (s2 !== null) {
          s3 = peg$parseclassCharacter();
          if (s3 !== null) {
            peg$reportedPos = s0;
            s1 = peg$c97(s1,s3);
            if (s1 === null) {
              peg$currPos = s0;
              s0 = s1;
            } else {
              s0 = s1;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$c0;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      s1 = peg$parsebracketDelimitedCharacter();
      if (s1 !== null) {
        peg$reportedPos = s0;
        s1 = peg$c98(s1);
      }
      if (s1 === null) {
        peg$currPos = s0;
        s0 = s1;
      } else {
        s0 = s1;
      }

      return s0;
    }

    function peg$parsebracketDelimitedCharacter() {
      var s0;

      s0 = peg$parsesimpleBracketDelimitedCharacter();
      if (s0 === null) {
        s0 = peg$parsesimpleEscapeSequence();
        if (s0 === null) {
          s0 = peg$parsezeroEscapeSequence();
          if (s0 === null) {
            s0 = peg$parsehexEscapeSequence();
            if (s0 === null) {
              s0 = peg$parseunicodeEscapeSequence();
              if (s0 === null) {
                s0 = peg$parseeolEscapeSequence();
              }
            }
          }
        }
      }

      return s0;
    }

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

      s0 = peg$currPos;
      s1 = peg$currPos;
      peg$silentFails++;
      if (input.charCodeAt(peg$currPos) === 93) {
        s2 = peg$c92;
        peg$currPos++;
      } else {
        s2 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c93); }
      }
      if (s2 === null) {
        if (input.charCodeAt(peg$currPos) === 92) {
          s2 = peg$c81;
          peg$currPos++;
        } else {
          s2 = null;
          if (peg$silentFails === 0) { peg$fail(peg$c82); }
        }
        if (s2 === null) {
          s2 = peg$parseeolChar();
        }
      }
      peg$silentFails--;
      if (s2 === null) {
        s1 = peg$c1;
      } else {
        peg$currPos = s1;
        s1 = peg$c0;
      }
      if (s1 !== null) {
        if (input.length > peg$currPos) {
          s2 = input.charAt(peg$currPos);
          peg$currPos++;
        } else {
          s2 = null;
          if (peg$silentFails === 0) { peg$fail(peg$c83); }
        }
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c84(s2);
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 92) {
        s1 = peg$c81;
        peg$currPos++;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c82); }
      }
      if (s1 !== null) {
        s2 = peg$currPos;
        peg$silentFails++;
        s3 = peg$parsedigit();
        if (s3 === null) {
          if (input.charCodeAt(peg$currPos) === 120) {
            s3 = peg$c99;
            peg$currPos++;
          } else {
            s3 = null;
            if (peg$silentFails === 0) { peg$fail(peg$c100); }
          }
          if (s3 === null) {
            if (input.charCodeAt(peg$currPos) === 117) {
              s3 = peg$c101;
              peg$currPos++;
            } else {
              s3 = null;
              if (peg$silentFails === 0) { peg$fail(peg$c102); }
            }
            if (s3 === null) {
              s3 = peg$parseeolChar();
            }
          }
        }
        peg$silentFails--;
        if (s3 === null) {
          s2 = peg$c1;
        } else {
          peg$currPos = s2;
          s2 = peg$c0;
        }
        if (s2 !== null) {
          if (input.length > peg$currPos) {
            s3 = input.charAt(peg$currPos);
            peg$currPos++;
          } else {
            s3 = null;
            if (peg$silentFails === 0) { peg$fail(peg$c83); }
          }
          if (s3 !== null) {
            peg$reportedPos = s0;
            s1 = peg$c103(s3);
            if (s1 === null) {
              peg$currPos = s0;
              s0 = s1;
            } else {
              s0 = s1;
            }
          } else {
            peg$currPos = s0;
            s0 = peg$c0;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.substr(peg$currPos, 2) === peg$c104) {
        s1 = peg$c104;
        peg$currPos += 2;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c105); }
      }
      if (s1 !== null) {
        s2 = peg$currPos;
        peg$silentFails++;
        s3 = peg$parsedigit();
        peg$silentFails--;
        if (s3 === null) {
          s2 = peg$c1;
        } else {
          peg$currPos = s2;
          s2 = peg$c0;
        }
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c106();
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.substr(peg$currPos, 2) === peg$c107) {
        s1 = peg$c107;
        peg$currPos += 2;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c108); }
      }
      if (s1 !== null) {
        s2 = peg$currPos;
        s3 = peg$currPos;
        s4 = peg$parsehexDigit();
        if (s4 !== null) {
          s5 = peg$parsehexDigit();
          if (s5 !== null) {
            s4 = [s4, s5];
            s3 = s4;
          } else {
            peg$currPos = s3;
            s3 = peg$c0;
          }
        } else {
          peg$currPos = s3;
          s3 = peg$c0;
        }
        if (s3 !== null) {
          s3 = input.substring(s2, peg$currPos);
        }
        s2 = s3;
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c109(s2);
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.substr(peg$currPos, 2) === peg$c110) {
        s1 = peg$c110;
        peg$currPos += 2;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c111); }
      }
      if (s1 !== null) {
        s2 = peg$currPos;
        s3 = peg$currPos;
        s4 = peg$parsehexDigit();
        if (s4 !== null) {
          s5 = peg$parsehexDigit();
          if (s5 !== null) {
            s6 = peg$parsehexDigit();
            if (s6 !== null) {
              s7 = peg$parsehexDigit();
              if (s7 !== null) {
                s4 = [s4, s5, s6, s7];
                s3 = s4;
              } else {
                peg$currPos = s3;
                s3 = peg$c0;
              }
            } else {
              peg$currPos = s3;
              s3 = peg$c0;
            }
          } else {
            peg$currPos = s3;
            s3 = peg$c0;
          }
        } else {
          peg$currPos = s3;
          s3 = peg$c0;
        }
        if (s3 !== null) {
          s3 = input.substring(s2, peg$currPos);
        }
        s2 = s3;
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c109(s2);
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.charCodeAt(peg$currPos) === 92) {
        s1 = peg$c81;
        peg$currPos++;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c82); }
      }
      if (s1 !== null) {
        s2 = peg$parseeol();
        if (s2 !== null) {
          peg$reportedPos = s0;
          s1 = peg$c112(s2);
          if (s1 === null) {
            peg$currPos = s0;
            s0 = s1;
          } else {
            s0 = s1;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

    function peg$parsedigit() {
      var s0;

      if (peg$c113.test(input.charAt(peg$currPos))) {
        s0 = input.charAt(peg$currPos);
        peg$currPos++;
      } else {
        s0 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c114); }
      }

      return s0;
    }

    function peg$parsehexDigit() {
      var s0;

      if (peg$c115.test(input.charAt(peg$currPos))) {
        s0 = input.charAt(peg$currPos);
        peg$currPos++;
      } else {
        s0 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c116); }
      }

      return s0;
    }

    function peg$parseletter() {
      var s0;

      s0 = peg$parselowerCaseLetter();
      if (s0 === null) {
        s0 = peg$parseupperCaseLetter();
      }

      return s0;
    }

    function peg$parselowerCaseLetter() {
      var s0;

      if (peg$c117.test(input.charAt(peg$currPos))) {
        s0 = input.charAt(peg$currPos);
        peg$currPos++;
      } else {
        s0 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c118); }
      }

      return s0;
    }

    function peg$parseupperCaseLetter() {
      var s0;

      if (peg$c119.test(input.charAt(peg$currPos))) {
        s0 = input.charAt(peg$currPos);
        peg$currPos++;
      } else {
        s0 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c120); }
      }

      return s0;
    }

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

      s0 = [];
      s1 = peg$parsewhitespace();
      if (s1 === null) {
        s1 = peg$parseeol();
        if (s1 === null) {
          s1 = peg$parsecomment();
        }
      }
      while (s1 !== null) {
        s0.push(s1);
        s1 = peg$parsewhitespace();
        if (s1 === null) {
          s1 = peg$parseeol();
          if (s1 === null) {
            s1 = peg$parsecomment();
          }
        }
      }

      return s0;
    }

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

      peg$silentFails++;
      s0 = peg$parsesingleLineComment();
      if (s0 === null) {
        s0 = peg$parsemultiLineComment();
      }
      peg$silentFails--;
      if (s0 === null) {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c121); }
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.substr(peg$currPos, 2) === peg$c122) {
        s1 = peg$c122;
        peg$currPos += 2;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c123); }
      }
      if (s1 !== null) {
        s2 = [];
        s3 = peg$currPos;
        s4 = peg$currPos;
        peg$silentFails++;
        s5 = peg$parseeolChar();
        peg$silentFails--;
        if (s5 === null) {
          s4 = peg$c1;
        } else {
          peg$currPos = s4;
          s4 = peg$c0;
        }
        if (s4 !== null) {
          if (input.length > peg$currPos) {
            s5 = input.charAt(peg$currPos);
            peg$currPos++;
          } else {
            s5 = null;
            if (peg$silentFails === 0) { peg$fail(peg$c83); }
          }
          if (s5 !== null) {
            s4 = [s4, s5];
            s3 = s4;
          } else {
            peg$currPos = s3;
            s3 = peg$c0;
          }
        } else {
          peg$currPos = s3;
          s3 = peg$c0;
        }
        while (s3 !== null) {
          s2.push(s3);
          s3 = peg$currPos;
          s4 = peg$currPos;
          peg$silentFails++;
          s5 = peg$parseeolChar();
          peg$silentFails--;
          if (s5 === null) {
            s4 = peg$c1;
          } else {
            peg$currPos = s4;
            s4 = peg$c0;
          }
          if (s4 !== null) {
            if (input.length > peg$currPos) {
              s5 = input.charAt(peg$currPos);
              peg$currPos++;
            } else {
              s5 = null;
              if (peg$silentFails === 0) { peg$fail(peg$c83); }
            }
            if (s5 !== null) {
              s4 = [s4, s5];
              s3 = s4;
            } else {
              peg$currPos = s3;
              s3 = peg$c0;
            }
          } else {
            peg$currPos = s3;
            s3 = peg$c0;
          }
        }
        if (s2 !== null) {
          s1 = [s1, s2];
          s0 = s1;
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      s0 = peg$currPos;
      if (input.substr(peg$currPos, 2) === peg$c124) {
        s1 = peg$c124;
        peg$currPos += 2;
      } else {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c125); }
      }
      if (s1 !== null) {
        s2 = [];
        s3 = peg$currPos;
        s4 = peg$currPos;
        peg$silentFails++;
        if (input.substr(peg$currPos, 2) === peg$c126) {
          s5 = peg$c126;
          peg$currPos += 2;
        } else {
          s5 = null;
          if (peg$silentFails === 0) { peg$fail(peg$c127); }
        }
        peg$silentFails--;
        if (s5 === null) {
          s4 = peg$c1;
        } else {
          peg$currPos = s4;
          s4 = peg$c0;
        }
        if (s4 !== null) {
          if (input.length > peg$currPos) {
            s5 = input.charAt(peg$currPos);
            peg$currPos++;
          } else {
            s5 = null;
            if (peg$silentFails === 0) { peg$fail(peg$c83); }
          }
          if (s5 !== null) {
            s4 = [s4, s5];
            s3 = s4;
          } else {
            peg$currPos = s3;
            s3 = peg$c0;
          }
        } else {
          peg$currPos = s3;
          s3 = peg$c0;
        }
        while (s3 !== null) {
          s2.push(s3);
          s3 = peg$currPos;
          s4 = peg$currPos;
          peg$silentFails++;
          if (input.substr(peg$currPos, 2) === peg$c126) {
            s5 = peg$c126;
            peg$currPos += 2;
          } else {
            s5 = null;
            if (peg$silentFails === 0) { peg$fail(peg$c127); }
          }
          peg$silentFails--;
          if (s5 === null) {
            s4 = peg$c1;
          } else {
            peg$currPos = s4;
            s4 = peg$c0;
          }
          if (s4 !== null) {
            if (input.length > peg$currPos) {
              s5 = input.charAt(peg$currPos);
              peg$currPos++;
            } else {
              s5 = null;
              if (peg$silentFails === 0) { peg$fail(peg$c83); }
            }
            if (s5 !== null) {
              s4 = [s4, s5];
              s3 = s4;
            } else {
              peg$currPos = s3;
              s3 = peg$c0;
            }
          } else {
            peg$currPos = s3;
            s3 = peg$c0;
          }
        }
        if (s2 !== null) {
          if (input.substr(peg$currPos, 2) === peg$c126) {
            s3 = peg$c126;
            peg$currPos += 2;
          } else {
            s3 = null;
            if (peg$silentFails === 0) { peg$fail(peg$c127); }
          }
          if (s3 !== null) {
            s1 = [s1, s2, s3];
            s0 = s1;
          } else {
            peg$currPos = s0;
            s0 = peg$c0;
          }
        } else {
          peg$currPos = s0;
          s0 = peg$c0;
        }
      } else {
        peg$currPos = s0;
        s0 = peg$c0;
      }

      return s0;
    }

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

      peg$silentFails++;
      if (input.charCodeAt(peg$currPos) === 10) {
        s0 = peg$c129;
        peg$currPos++;
      } else {
        s0 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c130); }
      }
      if (s0 === null) {
        if (input.substr(peg$currPos, 2) === peg$c131) {
          s0 = peg$c131;
          peg$currPos += 2;
        } else {
          s0 = null;
          if (peg$silentFails === 0) { peg$fail(peg$c132); }
        }
        if (s0 === null) {
          if (input.charCodeAt(peg$currPos) === 13) {
            s0 = peg$c133;
            peg$currPos++;
          } else {
            s0 = null;
            if (peg$silentFails === 0) { peg$fail(peg$c134); }
          }
          if (s0 === null) {
            if (input.charCodeAt(peg$currPos) === 8232) {
              s0 = peg$c135;
              peg$currPos++;
            } else {
              s0 = null;
              if (peg$silentFails === 0) { peg$fail(peg$c136); }
            }
            if (s0 === null) {
              if (input.charCodeAt(peg$currPos) === 8233) {
                s0 = peg$c137;
                peg$currPos++;
              } else {
                s0 = null;
                if (peg$silentFails === 0) { peg$fail(peg$c138); }
              }
            }
          }
        }
      }
      peg$silentFails--;
      if (s0 === null) {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c128); }
      }

      return s0;
    }

    function peg$parseeolChar() {
      var s0;

      if (peg$c139.test(input.charAt(peg$currPos))) {
        s0 = input.charAt(peg$currPos);
        peg$currPos++;
      } else {
        s0 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c140); }
      }

      return s0;
    }

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

      peg$silentFails++;
      if (peg$c142.test(input.charAt(peg$currPos))) {
        s0 = input.charAt(peg$currPos);
        peg$currPos++;
      } else {
        s0 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c143); }
      }
      peg$silentFails--;
      if (s0 === null) {
        s1 = null;
        if (peg$silentFails === 0) { peg$fail(peg$c141); }
      }

      return s0;
    }


      var utils = require("./utils");


    peg$result = peg$startRuleFunction();

    if (peg$result !== null && peg$currPos === input.length) {
      return peg$result;
    } else {
      peg$cleanupExpected(peg$maxFailExpected);
      peg$reportedPos = Math.max(peg$currPos, peg$maxFailPos);

      throw new SyntaxError(
        peg$maxFailExpected,
        peg$reportedPos < input.length ? input.charAt(peg$reportedPos) : null,
        peg$reportedPos,
        peg$computePosDetails(peg$reportedPos).line,
        peg$computePosDetails(peg$reportedPos).column
      );
    }
  }

  return {
    SyntaxError: SyntaxError,
    parse      : parse
  };
})();