text: /*! jsonpath 0.2.3 */
  
  (function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.jsonpath = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({"./aesprim":[function(require,module,exports){
  /*
    Copyright (C) 2013 Ariya Hidayat <ariya.hidayat@gmail.com>
    Copyright (C) 2013 Thaddee Tyl <thaddee.tyl@gmail.com>
    Copyright (C) 2013 Mathias Bynens <mathias@qiwi.be>
    Copyright (C) 2012 Ariya Hidayat <ariya.hidayat@gmail.com>
    Copyright (C) 2012 Mathias Bynens <mathias@qiwi.be>
    Copyright (C) 2012 Joost-Wim Boekesteijn <joost-wim@boekesteijn.nl>
    Copyright (C) 2012 Kris Kowal <kris.kowal@cixar.com>
    Copyright (C) 2012 Yusuke Suzuki <utatane.tea@gmail.com>
    Copyright (C) 2012 Arpad Borsos <arpad.borsos@googlemail.com>
    Copyright (C) 2011 Ariya Hidayat <ariya.hidayat@gmail.com>
  
    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are met:
  
      * Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer.
      * Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in the
        documentation and/or other materials provided with the distribution.
  
    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
    DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
  
  /*jslint bitwise:true plusplus:true */
  /*global esprima:true, define:true, exports:true, window: true,
  throwErrorTolerant: true,
  throwError: true, generateStatement: true, peek: true,
  parseAssignmentExpression: true, parseBlock: true, parseExpression: true,
  parseFunctionDeclaration: true, parseFunctionExpression: true,
  parseFunctionSourceElements: true, parseVariableIdentifier: true,
  parseLeftHandSideExpression: true,
  parseUnaryExpression: true,
  parseStatement: true, parseSourceElement: true */
  
  (function (root, factory) {
      'use strict';
  
      // Universal Module Definition (UMD) to support AMD, CommonJS/Node.js,
      // Rhino, and plain browser loading.
  
      /* istanbul ignore next */
      if (typeof define === 'function' && define.amd) {
          define(['exports'], factory);
      } else if (typeof exports !== 'undefined') {
          factory(exports);
      } else {
          factory((root.esprima = {}));
      }
  }(this, function (exports) {
      'use strict';
  
      var Token,
          TokenName,
          FnExprTokens,
          Syntax,
          PropertyKind,
          Messages,
          Regex,
          SyntaxTreeDelegate,
          source,
          strict,
          index,
          lineNumber,
          lineStart,
          length,
          delegate,
          lookahead,
          state,
          extra;
  
      Token = {
          BooleanLiteral: 1,
          EOF: 2,
          Identifier: 3,
          Keyword: 4,
          NullLiteral: 5,
          NumericLiteral: 6,
          Punctuator: 7,
          StringLiteral: 8,
          RegularExpression: 9
      };
  
      TokenName = {};
      TokenName[Token.BooleanLiteral] = 'Boolean';
      TokenName[Token.EOF] = '<end>';
      TokenName[Token.Identifier] = 'Identifier';
      TokenName[Token.Keyword] = 'Keyword';
      TokenName[Token.NullLiteral] = 'Null';
      TokenName[Token.NumericLiteral] = 'Numeric';
      TokenName[Token.Punctuator] = 'Punctuator';
      TokenName[Token.StringLiteral] = 'String';
      TokenName[Token.RegularExpression] = 'RegularExpression';
  
      // A function following one of those tokens is an expression.
      FnExprTokens = ['(', '{', '[', 'in', 'typeof', 'instanceof', 'new',
                      'return', 'case', 'delete', 'throw', 'void',
                      // assignment operators
                      '=', '+=', '-=', '*=', '/=', '%=', '<<=', '>>=', '>>>=',
                      '&=', '|=', '^=', ',',
                      // binary/unary operators
                      '+', '-', '*', '/', '%', '++', '--', '<<', '>>', '>>>', '&',
                      '|', '^', '!', '~', '&&', '||', '?', ':', '===', '==', '>=',
                      '<=', '<', '>', '!=', '!=='];
  
      Syntax = {
          AssignmentExpression: 'AssignmentExpression',
          ArrayExpression: 'ArrayExpression',
          BlockStatement: 'BlockStatement',
          BinaryExpression: 'BinaryExpression',
          BreakStatement: 'BreakStatement',
          CallExpression: 'CallExpression',
          CatchClause: 'CatchClause',
          ConditionalExpression: 'ConditionalExpression',
          ContinueStatement: 'ContinueStatement',
          DoWhileStatement: 'DoWhileStatement',
          DebuggerStatement: 'DebuggerStatement',
          EmptyStatement: 'EmptyStatement',
          ExpressionStatement: 'ExpressionStatement',
          ForStatement: 'ForStatement',
          ForInStatement: 'ForInStatement',
          FunctionDeclaration: 'FunctionDeclaration',
          FunctionExpression: 'FunctionExpression',
          Identifier: 'Identifier',
          IfStatement: 'IfStatement',
          Literal: 'Literal',
          LabeledStatement: 'LabeledStatement',
          LogicalExpression: 'LogicalExpression',
          MemberExpression: 'MemberExpression',
          NewExpression: 'NewExpression',
          ObjectExpression: 'ObjectExpression',
          Program: 'Program',
          Property: 'Property',
          ReturnStatement: 'ReturnStatement',
          SequenceExpression: 'SequenceExpression',
          SwitchStatement: 'SwitchStatement',
          SwitchCase: 'SwitchCase',
          ThisExpression: 'ThisExpression',
          ThrowStatement: 'ThrowStatement',
          TryStatement: 'TryStatement',
          UnaryExpression: 'UnaryExpression',
          UpdateExpression: 'UpdateExpression',
          VariableDeclaration: 'VariableDeclaration',
          VariableDeclarator: 'VariableDeclarator',
          WhileStatement: 'WhileStatement',
          WithStatement: 'WithStatement'
      };
  
      PropertyKind = {
          Data: 1,
          Get: 2,
          Set: 4
      };
  
      // Error messages should be identical to V8.
      Messages = {
          UnexpectedToken:  'Unexpected token %0',
          UnexpectedNumber:  'Unexpected number',
          UnexpectedString:  'Unexpected string',
          UnexpectedIdentifier:  'Unexpected identifier',
          UnexpectedReserved:  'Unexpected reserved word',
          UnexpectedEOS:  'Unexpected end of input',
          NewlineAfterThrow:  'Illegal newline after throw',
          InvalidRegExp: 'Invalid regular expression',
          UnterminatedRegExp:  'Invalid regular expression: missing /',
          InvalidLHSInAssignment:  'Invalid left-hand side in assignment',
          InvalidLHSInForIn:  'Invalid left-hand side in for-in',
          MultipleDefaultsInSwitch: 'More than one default clause in switch statement',
          NoCatchOrFinally:  'Missing catch or finally after try',
          UnknownLabel: 'Undefined label \'%0\'',
          Redeclaration: '%0 \'%1\' has already been declared',
          IllegalContinue: 'Illegal continue statement',
          IllegalBreak: 'Illegal break statement',
          IllegalReturn: 'Illegal return statement',
          StrictModeWith:  'Strict mode code may not include a with statement',
          StrictCatchVariable:  'Catch variable may not be eval or arguments in strict mode',
          StrictVarName:  'Variable name may not be eval or arguments in strict mode',
          StrictParamName:  'Parameter name eval or arguments is not allowed in strict mode',
          StrictParamDupe: 'Strict mode function may not have duplicate parameter names',
          StrictFunctionName:  'Function name may not be eval or arguments in strict mode',
          StrictOctalLiteral:  'Octal literals are not allowed in strict mode.',
          StrictDelete:  'Delete of an unqualified identifier in strict mode.',
          StrictDuplicateProperty:  'Duplicate data property in object literal not allowed in strict mode',
          AccessorDataProperty:  'Object literal may not have data and accessor property with the same name',
          AccessorGetSet:  'Object literal may not have multiple get/set accessors with the same name',
          StrictLHSAssignment:  'Assignment to eval or arguments is not allowed in strict mode',
          StrictLHSPostfix:  'Postfix increment/decrement may not have eval or arguments operand in strict mode',
          StrictLHSPrefix:  'Prefix increment/decrement may not have eval or arguments operand in strict mode',
          StrictReservedWord:  'Use of future reserved word in strict mode'
      };
  
      // See also tools/generate-unicode-regex.py.
      Regex = {
          NonAsciiIdentifierStart: new RegExp('[\xAA\xB5\xBA\xC0-\xD6\xD8-\xF6\xF8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u0527\u0531-\u0556\u0559\u0561-\u0587\u05D0-\u05EA\u05F0-\u05F2\u0620-\u064A\u066E\u066F\u0671-\u06D3\u06D5\u06E5\u06E6\u06EE\u06EF\u06FA-\u06FC\u06FF\u0710\u0712-\u072F\u074D-\u07A5\u07B1\u07CA-\u07EA\u07F4\u07F5\u07FA\u0800-\u0815\u081A\u0824\u0828\u0840-\u0858\u08A0\u08A2-\u08AC\u0904-\u0939\u093D\u0950\u0958-\u0961\u0971-\u0977\u0979-\u097F\u0985-\u098C\u098F\u0990\u0993-\u09A8\u09AA-\u09B0\u09B2\u09B6-\u09B9\u09BD\u09CE\u09DC\u09DD\u09DF-\u09E1\u09F0\u09F1\u0A05-\u0A0A\u0A0F\u0A10\u0A13-\u0A28\u0A2A-\u0A30\u0A32\u0A33\u0A35\u0A36\u0A38\u0A39\u0A59-\u0A5C\u0A5E\u0A72-\u0A74\u0A85-\u0A8D\u0A8F-\u0A91\u0A93-\u0AA8\u0AAA-\u0AB0\u0AB2\u0AB3\u0AB5-\u0AB9\u0ABD\u0AD0\u0AE0\u0AE1\u0B05-\u0B0C\u0B0F\u0B10\u0B13-\u0B28\u0B2A-\u0B30\u0B32\u0B33\u0B35-\u0B39\u0B3D\u0B5C\u0B5D\u0B5F-\u0B61\u0B71\u0B83\u0B85-\u0B8A\u0B8E-\u0B90\u0B92-\u0B95\u0B99\u0B9A\u0B9C\u0B9E\u0B9F\u0BA3\u0BA4\u0BA8-\u0BAA\u0BAE-\u0BB9\u0BD0\u0C05-\u0C0C\u0C0E-\u0C10\u0C12-\u0C28\u0C2A-\u0C33\u0C35-\u0C39\u0C3D\u0C58\u0C59\u0C60\u0C61\u0C85-\u0C8C\u0C8E-\u0C90\u0C92-\u0CA8\u0CAA-\u0CB3\u0CB5-\u0CB9\u0CBD\u0CDE\u0CE0\u0CE1\u0CF1\u0CF2\u0D05-\u0D0C\u0D0E-\u0D10\u0D12-\u0D3A\u0D3D\u0D4E\u0D60\u0D61\u0D7A-\u0D7F\u0D85-\u0D96\u0D9A-\u0DB1\u0DB3-\u0DBB\u0DBD\u0DC0-\u0DC6\u0E01-\u0E30\u0E32\u0E33\u0E40-\u0E46\u0E81\u0E82\u0E84\u0E87\u0E88\u0E8A\u0E8D\u0E94-\u0E97\u0E99-\u0E9F\u0EA1-\u0EA3\u0EA5\u0EA7\u0EAA\u0EAB\u0EAD-\u0EB0\u0EB2\u0EB3\u0EBD\u0EC0-\u0EC4\u0EC6\u0EDC-\u0EDF\u0F00\u0F40-\u0F47\u0F49-\u0F6C\u0F88-\u0F8C\u1000-\u102A\u103F\u1050-\u1055\u105A-\u105D\u1061\u1065\u1066\u106E-\u1070\u1075-\u1081\u108E\u10A0-\u10C5\u10C7\u10CD\u10D0-\u10FA\u10FC-\u1248\u124A-\u124D\u1250-\u1256\u1258\u125A-\u125D\u1260-\u1288\u128A-\u128D\u1290-\u12B0\u12B2-\u12B5\u12B8-\u12BE\u12C0\u12C2-\u12C5\u12C8-\u12D6\u12D8-\u1310\u1312-\u1315\u1318-\u135A\u1380-\u138F\u13A0-\u13F4\u1401-\u166C\u166F-\u167F\u1681-\u169A\u16A0-\u16EA\u16EE-\u16F0\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u1820-\u1877\u1880-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191C\u1950-\u196D\u1970-\u1974\u1980-\u19AB\u19C1-\u19C7\u1A00-\u1A16\u1A20-\u1A54\u1AA7\u1B05-\u1B33\u1B45-\u1B4B\u1B83-\u1BA0\u1BAE\u1BAF\u1BBA-\u1BE5\u1C00-\u1C23\u1C4D-\u1C4F\u1C5A-\u1C7D\u1CE9-\u1CEC\u1CEE-\u1CF1\u1CF5\u1CF6\u1D00-\u1DBF\u1E00-\u1F15\u1F18-\u1F1D\u1F20-\u1F45\u1F48-\u1F4D\u1F50-\u1F57\u1F59\u1F5B\u1F5D\u1F5F-\u1F7D\u1F80-\u1FB4\u1FB6-\u1FBC\u1FBE\u1FC2-\u1FC4\u1FC6-\u1FCC\u1FD0-\u1FD3\u1FD6-\u1FDB\u1FE0-\u1FEC\u1FF2-\u1FF4\u1FF6-\u1FFC\u2071\u207F\u2090-\u209C\u2102\u2107\u210A-\u2113\u2115\u2119-\u211D\u2124\u2126\u2128\u212A-\u212D\u212F-\u2139\u213C-\u213F\u2145-\u2149\u214E\u2160-\u2188\u2C00-\u2C2E\u2C30-\u2C5E\u2C60-\u2CE4\u2CEB-\u2CEE\u2CF2\u2CF3\u2D00-\u2D25\u2D27\u2D2D\u2D30-\u2D67\u2D6F\u2D80-\u2D96\u2DA0-\u2DA6\u2DA8-\u2DAE\u2DB0-\u2DB6\u2DB8-\u2DBE\u2DC0-\u2DC6\u2DC8-\u2DCE\u2DD0-\u2DD6\u2DD8-\u2DDE\u2E2F\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303C\u3041-\u3096\u309D-\u309F\u30A1-\u30FA\u30FC-\u30FF\u3105-\u312D\u3131-\u318E\u31A0-\u31BA\u31F0-\u31FF\u3400-\u4DB5\u4E00-\u9FCC\uA000-\uA48C\uA4D0-\uA4FD\uA500-\uA60C\uA610-\uA61F\uA62A\uA62B\uA640-\uA66E\uA67F-\uA697\uA6A0-\uA6EF\uA717-\uA71F\uA722-\uA788\uA78B-\uA78E\uA790-\uA793\uA7A0-\uA7AA\uA7F8-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA80-\uAAAF\uAAB1\uAAB5\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uABC0-\uABE2\uAC00-\uD7A3\uD7B0-\uD7C6\uD7CB-\uD7FB\uF900-\uFA6D\uFA70-\uFAD9\uFB00-\uFB06\uFB13-\uFB17\uFB1D\uFB1F-\uFB28\uFB2A-\uFB36\uFB38-\uFB3C\uFB3E\uFB40\uFB41\uFB43\uFB44\uFB46-\uFBB1\uFBD3-\uFD3D\uFD50-\uFD8F\uFD92-\uFDC7\uFDF0-\uFDFB\uFE70-\uFE74\uFE76-\uFEFC\uFF21-\uFF3A\uFF41-\uFF5A\uFF66-\uFFBE\uFFC2-\uFFC7\uFFCA-\uFFCF\uFFD2-\uFFD7\uFFDA-\uFFDC]'),
          NonAsciiIdentifierPart: new 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      };
  
      // Ensure the condition is true, otherwise throw an error.
      // This is only to have a better contract semantic, i.e. another safety net
      // to catch a logic error. The condition shall be fulfilled in normal case.
      // Do NOT use this to enforce a certain condition on any user input.
  
      function assert(condition, message) {
          /* istanbul ignore if */
          if (!condition) {
              throw new Error('ASSERT: ' + message);
          }
      }
  
      function isDecimalDigit(ch) {
          return (ch >= 48 && ch <= 57);   // 0..9
      }
  
      function isHexDigit(ch) {
          return '0123456789abcdefABCDEF'.indexOf(ch) >= 0;
      }
  
      function isOctalDigit(ch) {
          return '01234567'.indexOf(ch) >= 0;
      }
  
  
      // 7.2 White Space
  
      function isWhiteSpace(ch) {
          return (ch === 0x20) || (ch === 0x09) || (ch === 0x0B) || (ch === 0x0C) || (ch === 0xA0) ||
              (ch >= 0x1680 && [0x1680, 0x180E, 0x2000, 0x2001, 0x2002, 0x2003, 0x2004, 0x2005, 0x2006, 0x2007, 0x2008, 0x2009, 0x200A, 0x202F, 0x205F, 0x3000, 0xFEFF].indexOf(ch) >= 0);
      }
  
      // 7.3 Line Terminators
  
      function isLineTerminator(ch) {
          return (ch === 0x0A) || (ch === 0x0D) || (ch === 0x2028) || (ch === 0x2029);
      }
  
      // 7.6 Identifier Names and Identifiers
  
      function isIdentifierStart(ch) {
          return (ch == 0x40) ||  (ch === 0x24) || (ch === 0x5F) ||  // $ (dollar) and _ (underscore)
              (ch >= 0x41 && ch <= 0x5A) ||         // A..Z
              (ch >= 0x61 && ch <= 0x7A) ||         // a..z
              (ch === 0x5C) ||                      // \ (backslash)
              ((ch >= 0x80) && Regex.NonAsciiIdentifierStart.test(String.fromCharCode(ch)));
      }
  
      function isIdentifierPart(ch) {
          return (ch === 0x24) || (ch === 0x5F) ||  // $ (dollar) and _ (underscore)
              (ch >= 0x41 && ch <= 0x5A) ||         // A..Z
              (ch >= 0x61 && ch <= 0x7A) ||         // a..z
              (ch >= 0x30 && ch <= 0x39) ||         // 0..9
              (ch === 0x5C) ||                      // \ (backslash)
              ((ch >= 0x80) && Regex.NonAsciiIdentifierPart.test(String.fromCharCode(ch)));
      }
  
      // 7.6.1.2 Future Reserved Words
  
      function isFutureReservedWord(id) {
          switch (id) {
          case 'class':
          case 'enum':
          case 'export':
          case 'extends':
          case 'import':
          case 'super':
              return true;
          default:
              return false;
          }
      }
  
      function isStrictModeReservedWord(id) {
          switch (id) {
          case 'implements':
          case 'interface':
          case 'package':
          case 'private':
          case 'protected':
          case 'public':
          case 'static':
          case 'yield':
          case 'let':
              return true;
          default:
              return false;
          }
      }
  
      function isRestrictedWord(id) {
          return id === 'eval' || id === 'arguments';
      }
  
      // 7.6.1.1 Keywords
  
      function isKeyword(id) {
          if (strict && isStrictModeReservedWord(id)) {
              return true;
          }
  
          // 'const' is specialized as Keyword in V8.
          // 'yield' and 'let' are for compatiblity with SpiderMonkey and ES.next.
          // Some others are from future reserved words.
  
          switch (id.length) {
          case 2:
              return (id === 'if') || (id === 'in') || (id === 'do');
          case 3:
              return (id === 'var') || (id === 'for') || (id === 'new') ||
                  (id === 'try') || (id === 'let');
          case 4:
              return (id === 'this') || (id === 'else') || (id === 'case') ||
                  (id === 'void') || (id === 'with') || (id === 'enum');
          case 5:
              return (id === 'while') || (id === 'break') || (id === 'catch') ||
                  (id === 'throw') || (id === 'const') || (id === 'yield') ||
                  (id === 'class') || (id === 'super');
          case 6:
              return (id === 'return') || (id === 'typeof') || (id === 'delete') ||
                  (id === 'switch') || (id === 'export') || (id === 'import');
          case 7:
              return (id === 'default') || (id === 'finally') || (id === 'extends');
          case 8:
              return (id === 'function') || (id === 'continue') || (id === 'debugger');
          case 10:
              return (id === 'instanceof');
          default:
              return false;
          }
      }
  
      // 7.4 Comments
  
      function addComment(type, value, start, end, loc) {
          var comment, attacher;
  
          assert(typeof start === 'number', 'Comment must have valid position');
  
          // Because the way the actual token is scanned, often the comments
          // (if any) are skipped twice during the lexical analysis.
          // Thus, we need to skip adding a comment if the comment array already
          // handled it.
          if (state.lastCommentStart >= start) {
              return;
          }
          state.lastCommentStart = start;
  
          comment = {
              type: type,
              value: value
          };
          if (extra.range) {
              comment.range = [start, end];
          }
          if (extra.loc) {
              comment.loc = loc;
          }
          extra.comments.push(comment);
          if (extra.attachComment) {
              extra.leadingComments.push(comment);
              extra.trailingComments.push(comment);
          }
      }
  
      function skipSingleLineComment(offset) {
          var start, loc, ch, comment;
  
          start = index - offset;
          loc = {
              start: {
                  line: lineNumber,
                  column: index - lineStart - offset
              }
          };
  
          while (index < length) {
              ch = source.charCodeAt(index);
              ++index;
              if (isLineTerminator(ch)) {
                  if (extra.comments) {
                      comment = source.slice(start + offset, index - 1);
                      loc.end = {
                          line: lineNumber,
                          column: index - lineStart - 1
                      };
                      addComment('Line', comment, start, index - 1, loc);
                  }
                  if (ch === 13 && source.charCodeAt(index) === 10) {
                      ++index;
                  }
                  ++lineNumber;
                  lineStart = index;
                  return;
              }
          }
  
          if (extra.comments) {
              comment = source.slice(start + offset, index);
              loc.end = {
                  line: lineNumber,
                  column: index - lineStart
              };
              addComment('Line', comment, start, index, loc);
          }
      }
  
      function skipMultiLineComment() {
          var start, loc, ch, comment;
  
          if (extra.comments) {
              start = index - 2;
              loc = {
                  start: {
                      line: lineNumber,
                      column: index - lineStart - 2
                  }
              };
          }
  
          while (index < length) {
              ch = source.charCodeAt(index);
              if (isLineTerminator(ch)) {
                  if (ch === 0x0D && source.charCodeAt(index + 1) === 0x0A) {
                      ++index;
                  }
                  ++lineNumber;
                  ++index;
                  lineStart = index;
                  if (index >= length) {
                      throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
                  }
              } else if (ch === 0x2A) {
                  // Block comment ends with '*/'.
                  if (source.charCodeAt(index + 1) === 0x2F) {
                      ++index;
                      ++index;
                      if (extra.comments) {
                          comment = source.slice(start + 2, index - 2);
                          loc.end = {
                              line: lineNumber,
                              column: index - lineStart
                          };
                          addComment('Block', comment, start, index, loc);
                      }
                      return;
                  }
                  ++index;
              } else {
                  ++index;
              }
          }
  
          throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
      }
  
      function skipComment() {
          var ch, start;
  
          start = (index === 0);
          while (index < length) {
              ch = source.charCodeAt(index);
  
              if (isWhiteSpace(ch)) {
                  ++index;
              } else if (isLineTerminator(ch)) {
                  ++index;
                  if (ch === 0x0D && source.charCodeAt(index) === 0x0A) {
                      ++index;
                  }
                  ++lineNumber;
                  lineStart = index;
                  start = true;
              } else if (ch === 0x2F) { // U+002F is '/'
                  ch = source.charCodeAt(index + 1);
                  if (ch === 0x2F) {
                      ++index;
                      ++index;
                      skipSingleLineComment(2);
                      start = true;
                  } else if (ch === 0x2A) {  // U+002A is '*'
                      ++index;
                      ++index;
                      skipMultiLineComment();
                  } else {
                      break;
                  }
              } else if (start && ch === 0x2D) { // U+002D is '-'
                  // U+003E is '>'
                  if ((source.charCodeAt(index + 1) === 0x2D) && (source.charCodeAt(index + 2) === 0x3E)) {
                      // '-->' is a single-line comment
                      index += 3;
                      skipSingleLineComment(3);
                  } else {
                      break;
                  }
              } else if (ch === 0x3C) { // U+003C is '<'
                  if (source.slice(index + 1, index + 4) === '!--') {
                      ++index; // `<`
                      ++index; // `!`
                      ++index; // `-`
                      ++index; // `-`
                      skipSingleLineComment(4);
                  } else {
                      break;
                  }
              } else {
                  break;
              }
          }
      }
  
      function scanHexEscape(prefix) {
          var i, len, ch, code = 0;
  
          len = (prefix === 'u') ? 4 : 2;
          for (i = 0; i < len; ++i) {
              if (index < length && isHexDigit(source[index])) {
                  ch = source[index++];
                  code = code * 16 + '0123456789abcdef'.indexOf(ch.toLowerCase());
              } else {
                  return '';
              }
          }
          return String.fromCharCode(code);
      }
  
      function getEscapedIdentifier() {
          var ch, id;
  
          ch = source.charCodeAt(index++);
          id = String.fromCharCode(ch);
  
          // '\u' (U+005C, U+0075) denotes an escaped character.
          if (ch === 0x5C) {
              if (source.charCodeAt(index) !== 0x75) {
                  throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
              }
              ++index;
              ch = scanHexEscape('u');
              if (!ch || ch === '\\' || !isIdentifierStart(ch.charCodeAt(0))) {
                  throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
              }
              id = ch;
          }
  
          while (index < length) {
              ch = source.charCodeAt(index);
              if (!isIdentifierPart(ch)) {
                  break;
              }
              ++index;
              id += String.fromCharCode(ch);
  
              // '\u' (U+005C, U+0075) denotes an escaped character.
              if (ch === 0x5C) {
                  id = id.substr(0, id.length - 1);
                  if (source.charCodeAt(index) !== 0x75) {
                      throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
                  }
                  ++index;
                  ch = scanHexEscape('u');
                  if (!ch || ch === '\\' || !isIdentifierPart(ch.charCodeAt(0))) {
                      throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
                  }
                  id += ch;
              }
          }
  
          return id;
      }
  
      function getIdentifier() {
          var start, ch;
  
          start = index++;
          while (index < length) {
              ch = source.charCodeAt(index);
              if (ch === 0x5C) {
                  // Blackslash (U+005C) marks Unicode escape sequence.
                  index = start;
                  return getEscapedIdentifier();
              }
              if (isIdentifierPart(ch)) {
                  ++index;
              } else {
                  break;
              }
          }
  
          return source.slice(start, index);
      }
  
      function scanIdentifier() {
          var start, id, type;
  
          start = index;
  
          // Backslash (U+005C) starts an escaped character.
          id = (source.charCodeAt(index) === 0x5C) ? getEscapedIdentifier() : getIdentifier();
  
          // There is no keyword or literal with only one character.
          // Thus, it must be an identifier.
          if (id.length === 1) {
              type = Token.Identifier;
          } else if (isKeyword(id)) {
              type = Token.Keyword;
          } else if (id === 'null') {
              type = Token.NullLiteral;
          } else if (id === 'true' || id === 'false') {
              type = Token.BooleanLiteral;
          } else {
              type = Token.Identifier;
          }
  
          return {
              type: type,
              value: id,
              lineNumber: lineNumber,
              lineStart: lineStart,
              start: start,
              end: index
          };
      }
  
  
      // 7.7 Punctuators
  
      function scanPunctuator() {
          var start = index,
              code = source.charCodeAt(index),
              code2,
              ch1 = source[index],
              ch2,
              ch3,
              ch4;
  
          switch (code) {
  
          // Check for most common single-character punctuators.
          case 0x2E:  // . dot
          case 0x28:  // ( open bracket
          case 0x29:  // ) close bracket
          case 0x3B:  // ; semicolon
          case 0x2C:  // , comma
          case 0x7B:  // { open curly brace
          case 0x7D:  // } close curly brace
          case 0x5B:  // [
          case 0x5D:  // ]
          case 0x3A:  // :
          case 0x3F:  // ?
          case 0x7E:  // ~
              ++index;
              if (extra.tokenize) {
                  if (code === 0x28) {
                      extra.openParenToken = extra.tokens.length;
                  } else if (code === 0x7B) {
                      extra.openCurlyToken = extra.tokens.length;
                  }
              }
              return {
                  type: Token.Punctuator,
                  value: String.fromCharCode(code),
                  lineNumber: lineNumber,
                  lineStart: lineStart,
                  start: start,
                  end: index
              };
  
          default:
              code2 = source.charCodeAt(index + 1);
  
              // '=' (U+003D) marks an assignment or comparison operator.
              if (code2 === 0x3D) {
                  switch (code) {
                  case 0x2B:  // +
                  case 0x2D:  // -
                  case 0x2F:  // /
                  case 0x3C:  // <
                  case 0x3E:  // >
                  case 0x5E:  // ^
                  case 0x7C:  // |
                  case 0x25:  // %
                  case 0x26:  // &
                  case 0x2A:  // *
                      index += 2;
                      return {
                          type: Token.Punctuator,
                          value: String.fromCharCode(code) + String.fromCharCode(code2),
                          lineNumber: lineNumber,
                          lineStart: lineStart,
                          start: start,
                          end: index
                      };
  
                  case 0x21: // !
                  case 0x3D: // =
                      index += 2;
  
                      // !== and ===
                      if (source.charCodeAt(index) === 0x3D) {
                          ++index;
                      }
                      return {
                          type: Token.Punctuator,
                          value: source.slice(start, index),
                          lineNumber: lineNumber,
                          lineStart: lineStart,
                          start: start,
                          end: index
                      };
                  }
              }
          }
  
          // 4-character punctuator: >>>=
  
          ch4 = source.substr(index, 4);
  
          if (ch4 === '>>>=') {
              index += 4;
              return {
                  type: Token.Punctuator,
                  value: ch4,
                  lineNumber: lineNumber,
                  lineStart: lineStart,
                  start: start,
                  end: index
              };
          }
  
          // 3-character punctuators: === !== >>> <<= >>=
  
          ch3 = ch4.substr(0, 3);
  
          if (ch3 === '>>>' || ch3 === '<<=' || ch3 === '>>=') {
              index += 3;
              return {
                  type: Token.Punctuator,
                  value: ch3,
                  lineNumber: lineNumber,
                  lineStart: lineStart,
                  start: start,
                  end: index
              };
          }
  
          // Other 2-character punctuators: ++ -- << >> && ||
          ch2 = ch3.substr(0, 2);
  
          if ((ch1 === ch2[1] && ('+-<>&|'.indexOf(ch1) >= 0)) || ch2 === '=>') {
              index += 2;
              return {
                  type: Token.Punctuator,
                  value: ch2,
                  lineNumber: lineNumber,
                  lineStart: lineStart,
                  start: start,
                  end: index
              };
          }
  
          // 1-character punctuators: < > = ! + - * % & | ^ /
          if ('<>=!+-*%&|^/'.indexOf(ch1) >= 0) {
              ++index;
              return {
                  type: Token.Punctuator,
                  value: ch1,
                  lineNumber: lineNumber,
                  lineStart: lineStart,
                  start: start,
                  end: index
              };
          }
  
          throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
      }
  
      // 7.8.3 Numeric Literals
  
      function scanHexLiteral(start) {
          var number = '';
  
          while (index < length) {
              if (!isHexDigit(source[index])) {
                  break;
              }
              number += source[index++];
          }
  
          if (number.length === 0) {
              throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
          }
  
          if (isIdentifierStart(source.charCodeAt(index))) {
              throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
          }
  
          return {
              type: Token.NumericLiteral,
              value: parseInt('0x' + number, 16),
              lineNumber: lineNumber,
              lineStart: lineStart,
              start: start,
              end: index
          };
      }
  
      function scanOctalLiteral(start) {
          var number = '0' + source[index++];
          while (index < length) {
              if (!isOctalDigit(source[index])) {
                  break;
              }
              number += source[index++];
          }
  
          if (isIdentifierStart(source.charCodeAt(index)) || isDecimalDigit(source.charCodeAt(index))) {
              throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
          }
  
          return {
              type: Token.NumericLiteral,
              value: parseInt(number, 8),
              octal: true,
              lineNumber: lineNumber,
              lineStart: lineStart,
              start: start,
              end: index
          };
      }
  
      function scanNumericLiteral() {
          var number, start, ch;
  
          ch = source[index];
          assert(isDecimalDigit(ch.charCodeAt(0)) || (ch === '.'),
              'Numeric literal must start with a decimal digit or a decimal point');
  
          start = index;
          number = '';
          if (ch !== '.') {
              number = source[index++];
              ch = source[index];
  
              // Hex number starts with '0x'.
              // Octal number starts with '0'.
              if (number === '0') {
                  if (ch === 'x' || ch === 'X') {
                      ++index;
                      return scanHexLiteral(start);
                  }
                  if (isOctalDigit(ch)) {
                      return scanOctalLiteral(start);
                  }
  
                  // decimal number starts with '0' such as '09' is illegal.
                  if (ch && isDecimalDigit(ch.charCodeAt(0))) {
                      throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
                  }
              }
  
              while (isDecimalDigit(source.charCodeAt(index))) {
                  number += source[index++];
              }
              ch = source[index];
          }
  
          if (ch === '.') {
              number += source[index++];
              while (isDecimalDigit(source.charCodeAt(index))) {
                  number += source[index++];
              }
              ch = source[index];
          }
  
          if (ch === 'e' || ch === 'E') {
              number += source[index++];
  
              ch = source[index];
              if (ch === '+' || ch === '-') {
                  number += source[index++];
              }
              if (isDecimalDigit(source.charCodeAt(index))) {
                  while (isDecimalDigit(source.charCodeAt(index))) {
                      number += source[index++];
                  }
              } else {
                  throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
              }
          }
  
          if (isIdentifierStart(source.charCodeAt(index))) {
              throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
          }
  
          return {
              type: Token.NumericLiteral,
              value: parseFloat(number),
              lineNumber: lineNumber,
              lineStart: lineStart,
              start: start,
              end: index
          };
      }
  
      // 7.8.4 String Literals
  
      function scanStringLiteral() {
          var str = '', quote, start, ch, code, unescaped, restore, octal = false, startLineNumber, startLineStart;
          startLineNumber = lineNumber;
          startLineStart = lineStart;
  
          quote = source[index];
          assert((quote === '\'' || quote === '"'),
              'String literal must starts with a quote');
  
          start = index;
          ++index;
  
          while (index < length) {
              ch = source[index++];
  
              if (ch === quote) {
                  quote = '';
                  break;
              } else if (ch === '\\') {
                  ch = source[index++];
                  if (!ch || !isLineTerminator(ch.charCodeAt(0))) {
                      switch (ch) {
                      case 'u':
                      case 'x':
                          restore = index;
                          unescaped = scanHexEscape(ch);
                          if (unescaped) {
                              str += unescaped;
                          } else {
                              index = restore;
                              str += ch;
                          }
                          break;
                      case 'n':
                          str += '\n';
                          break;
                      case 'r':
                          str += '\r';
                          break;
                      case 't':
                          str += '\t';
                          break;
                      case 'b':
                          str += '\b';
                          break;
                      case 'f':
                          str += '\f';
                          break;
                      case 'v':
                          str += '\x0B';
                          break;
  
                      default:
                          if (isOctalDigit(ch)) {
                              code = '01234567'.indexOf(ch);
  
                              // \0 is not octal escape sequence
                              if (code !== 0) {
                                  octal = true;
                              }
  
                              if (index < length && isOctalDigit(source[index])) {
                                  octal = true;
                                  code = code * 8 + '01234567'.indexOf(source[index++]);
  
                                  // 3 digits are only allowed when string starts
                                  // with 0, 1, 2, 3
                                  if ('0123'.indexOf(ch) >= 0 &&
                                          index < length &&
                                          isOctalDigit(source[index])) {
                                      code = code * 8 + '01234567'.indexOf(source[index++]);
                                  }
                              }
                              str += String.fromCharCode(code);
                          } else {
                              str += ch;
                          }
                          break;
                      }
                  } else {
                      ++lineNumber;
                      if (ch ===  '\r' && source[index] === '\n') {
                          ++index;
                      }
                      lineStart = index;
                  }
              } else if (isLineTerminator(ch.charCodeAt(0))) {
                  break;
              } else {
                  str += ch;
              }
          }
  
          if (quote !== '') {
              throwError({}, Messages.UnexpectedToken, 'ILLEGAL');
          }
  
          return {
              type: Token.StringLiteral,
              value: str,
              octal: octal,
              startLineNumber: startLineNumber,
              startLineStart: startLineStart,
              lineNumber: lineNumber,
              lineStart: lineStart,
              start: start,
              end: index
          };
      }
  
      function testRegExp(pattern, flags) {
          var value;
          try {
              value = new RegExp(pattern, flags);
          } catch (e) {
              throwError({}, Messages.InvalidRegExp);
          }
          return value;
      }
  
      function scanRegExpBody() {
          var ch, str, classMarker, terminated, body;
  
          ch = source[index];
          assert(ch === '/', 'Regular expression literal must start with a slash');
          str = source[index++];
  
          classMarker = false;
          terminated = false;
          while (index < length) {
              ch = source[index++];
              str += ch;
              if (ch === '\\') {
                  ch = source[index++];
                  // ECMA-262 7.8.5
                  if (isLineTerminator(ch.charCodeAt(0))) {
                      throwError({}, Messages.UnterminatedRegExp);
                  }
                  str += ch;
              } else if (isLineTerminator(ch.charCodeAt(0))) {
                  throwError({}, Messages.UnterminatedRegExp);
              } else if (classMarker) {
                  if (ch === ']') {
                      classMarker = false;
                  }
              } else {
                  if (ch === '/') {
                      terminated = true;
                      break;
                  } else if (ch === '[') {
                      classMarker = true;
                  }
              }
          }
  
          if (!terminated) {
              throwError({}, Messages.UnterminatedRegExp);
          }
  
          // Exclude leading and trailing slash.
          body = str.substr(1, str.length - 2);
          return {
              value: body,
              literal: str
          };
      }
  
      function scanRegExpFlags() {
          var ch, str, flags, restore;
  
          str = '';
          flags = '';
          while (index < length) {
              ch = source[index];
              if (!isIdentifierPart(ch.charCodeAt(0))) {
                  break;
              }
  
              ++index;
              if (ch === '\\' && index < length) {
                  ch = source[index];
                  if (ch === 'u') {
                      ++index;
                      restore = index;
                      ch = scanHexEscape('u');
                      if (ch) {
                          flags += ch;
                          for (str += '\\u'; restore < index; ++restore) {
                              str += source[restore];
                          }
                      } else {
                          index = restore;
                          flags += 'u';
                          str += '\\u';
                      }
                      throwErrorTolerant({}, Messages.UnexpectedToken, 'ILLEGAL');
                  } else {
                      str += '\\';
                      throwErrorTolerant({}, Messages.UnexpectedToken, 'ILLEGAL');
                  }
              } else {
                  flags += ch;
                  str += ch;
              }
          }
  
          return {
              value: flags,
              literal: str
          };
      }
  
      function scanRegExp() {
          var start, body, flags, pattern, value;
  
          lookahead = null;
          skipComment();
          start = index;
  
          body = scanRegExpBody();
          flags = scanRegExpFlags();
          value = testRegExp(body.value, flags.value);
  
          if (extra.tokenize) {
              return {
                  type: Token.RegularExpression,
                  value: value,
                  lineNumber: lineNumber,
                  lineStart: lineStart,
                  start: start,
                  end: index
              };
          }
  
          return {
              literal: body.literal + flags.literal,
              value: value,
              start: start,
              end: index
          };
      }
  
      function collectRegex() {
          var pos, loc, regex, token;
  
          skipComment();
  
          pos = index;
          loc = {
              start: {
                  line: lineNumber,
                  column: index - lineStart
              }
          };
  
          regex = scanRegExp();
          loc.end = {
              line: lineNumber,
              column: index - lineStart
          };
  
          /* istanbul ignore next */
          if (!extra.tokenize) {
              // Pop the previous token, which is likely '/' or '/='
              if (extra.tokens.length > 0) {
                  token = extra.tokens[extra.tokens.length - 1];
                  if (token.range[0] === pos && token.type === 'Punctuator') {
                      if (token.value === '/' || token.value === '/=') {
                          extra.tokens.pop();
                      }
                  }
              }
  
              extra.tokens.push({
                  type: 'RegularExpression',
                  value: regex.literal,
                  range: [pos, index],
                  loc: loc
              });
          }
  
          return regex;
      }
  
      function isIdentifierName(token) {
          return token.type === Token.Identifier ||
              token.type === Token.Keyword ||
              token.type === Token.BooleanLiteral ||
              token.type === Token.NullLiteral;
      }
  
      function advanceSlash() {
          var prevToken,
              checkToken;
          // Using the following algorithm:
          // https://github.com/mozilla/sweet.js/wiki/design
          prevToken = extra.tokens[extra.tokens.length - 1];
          if (!prevToken) {
              // Nothing before that: it cannot be a division.
              return collectRegex();
          }
          if (prevToken.type === 'Punctuator') {
              if (prevToken.value === ']') {
                  return scanPunctuator();
              }
              if (prevToken.value === ')') {
                  checkToken = extra.tokens[extra.openParenToken - 1];
                  if (checkToken &&
                          checkToken.type === 'Keyword' &&
                          (checkToken.value === 'if' ||
                           checkToken.value === 'while' ||
                           checkToken.value === 'for' ||
                           checkToken.value === 'with')) {
                      return collectRegex();
                  }
                  return scanPunctuator();
              }
              if (prevToken.value === '}') {
                  // Dividing a function by anything makes little sense,
                  // but we have to check for that.
                  if (extra.tokens[extra.openCurlyToken - 3] &&
                          extra.tokens[extra.openCurlyToken - 3].type === 'Keyword') {
                      // Anonymous function.
                      checkToken = extra.tokens[extra.openCurlyToken - 4];
                      if (!checkToken) {
                          return scanPunctuator();
                      }
                  } else if (extra.tokens[extra.openCurlyToken - 4] &&
                          extra.tokens[extra.openCurlyToken - 4].type === 'Keyword') {
                      // Named function.
                      checkToken = extra.tokens[extra.openCurlyToken - 5];
                      if (!checkToken) {
                          return collectRegex();
                      }
                  } else {
                      return scanPunctuator();
                  }
                  // checkToken determines whether the function is
                  // a declaration or an expression.
                  if (FnExprTokens.indexOf(checkToken.value) >= 0) {
                      // It is an expression.
                      return scanPunctuator();
                  }
                  // It is a declaration.
                  return collectRegex();
              }
              return collectRegex();
          }
          if (prevToken.type === 'Keyword') {
              return collectRegex();
          }
          return scanPunctuator();
      }
  
      function advance() {
          var ch;
  
          skipComment();
  
          if (index >= length) {
              return {
                  type: Token.EOF,
                  lineNumber: lineNumber,
                  lineStart: lineStart,
                  start: index,
                  end: index
              };
          }
  
          ch = source.charCodeAt(index);
  
          if (isIdentifierStart(ch)) {
              return scanIdentifier();
          }
  
          // Very common: ( and ) and ;
          if (ch === 0x28 || ch === 0x29 || ch === 0x3B) {
              return scanPunctuator();
          }
  
          // String literal starts with single quote (U+0027) or double quote (U+0022).
          if (ch === 0x27 || ch === 0x22) {
              return scanStringLiteral();
          }
  
  
          // Dot (.) U+002E can also start a floating-point number, hence the need
          // to check the next character.
          if (ch === 0x2E) {
              if (isDecimalDigit(source.charCodeAt(index + 1))) {
                  return scanNumericLiteral();
              }
              return scanPunctuator();
          }
  
          if (isDecimalDigit(ch)) {
              return scanNumericLiteral();
          }
  
          // Slash (/) U+002F can also start a regex.
          if (extra.tokenize && ch === 0x2F) {
              return advanceSlash();
          }
  
          return scanPunctuator();
      }
  
      function collectToken() {
          var loc, token, range, value;
  
          skipComment();
          loc = {
              start: {
                  line: lineNumber,
                  column: index - lineStart
              }
          };
  
          token = advance();
          loc.end = {
              line: lineNumber,
              column: index - lineStart
          };
  
          if (token.type !== Token.EOF) {
              value = source.slice(token.start, token.end);
              extra.tokens.push({
                  type: TokenName[token.type],
                  value: value,
                  range: [token.start, token.end],
                  loc: loc
              });
          }
  
          return token;
      }
  
      function lex() {
          var token;
  
          token = lookahead;
          index = token.end;
          lineNumber = token.lineNumber;
          lineStart = token.lineStart;
  
          lookahead = (typeof extra.tokens !== 'undefined') ? collectToken() : advance();
  
          index = token.end;
          lineNumber = token.lineNumber;
          lineStart = token.lineStart;
  
          return token;
      }
  
      function peek() {
          var pos, line, start;
  
          pos = index;
          line = lineNumber;
          start = lineStart;
          lookahead = (typeof extra.tokens !== 'undefined') ? collectToken() : advance();
          index = pos;
          lineNumber = line;
          lineStart = start;
      }
  
      function Position(line, column) {
          this.line = line;
          this.column = column;
      }
  
      function SourceLocation(startLine, startColumn, line, column) {
          this.start = new Position(startLine, startColumn);
          this.end = new Position(line, column);
      }
  
      SyntaxTreeDelegate = {
  
          name: 'SyntaxTree',
  
          processComment: function (node) {
              var lastChild, trailingComments;
  
              if (node.type === Syntax.Program) {
                  if (node.body.length > 0) {
                      return;
                  }
              }
  
              if (extra.trailingComments.length > 0) {
                  if (extra.trailingComments[0].range[0] >= node.range[1]) {
                      trailingComments = extra.trailingComments;
                      extra.trailingComments = [];
                  } else {
                      extra.trailingComments.length = 0;
                  }
              } else {
                  if (extra.bottomRightStack.length > 0 &&
                          extra.bottomRightStack[extra.bottomRightStack.length - 1].trailingComments &&
                          extra.bottomRightStack[extra.bottomRightStack.length - 1].trailingComments[0].range[0] >= node.range[1]) {
                      trailingComments = extra.bottomRightStack[extra.bottomRightStack.length - 1].trailingComments;
                      delete extra.bottomRightStack[extra.bottomRightStack.length - 1].trailingComments;
                  }
              }
  
              // Eating the stack.
              while (extra.bottomRightStack.length > 0 && extra.bottomRightStack[extra.bottomRightStack.length - 1].range[0] >= node.range[0]) {
                  lastChild = extra.bottomRightStack.pop();
              }
  
              if (lastChild) {
                  if (lastChild.leadingComments && lastChild.leadingComments[lastChild.leadingComments.length - 1].range[1] <= node.range[0]) {
                      node.leadingComments = lastChild.leadingComments;
                      delete lastChild.leadingComments;
                  }
              } else if (extra.leadingComments.length > 0 && extra.leadingComments[extra.leadingComments.length - 1].range[1] <= node.range[0]) {
                  node.leadingComments = extra.leadingComments;
                  extra.leadingComments = [];
              }
  
  
              if (trailingComments) {
                  node.trailingComments = trailingComments;
              }
  
              extra.bottomRightStack.push(node);
          },
  
          markEnd: function (node, startToken) {
              if (extra.range) {
                  node.range = [startToken.start, index];
              }
              if (extra.loc) {
                  node.loc = new SourceLocation(
                      startToken.startLineNumber === undefined ?  startToken.lineNumber : startToken.startLineNumber,
                      startToken.start - (startToken.startLineStart === undefined ?  startToken.lineStart : startToken.startLineStart),
                      lineNumber,
                      index - lineStart
                  );
                  this.postProcess(node);
              }
  
              if (extra.attachComment) {
                  this.processComment(node);
              }
              return node;
          },
  
          postProcess: function (node) {
              if (extra.source) {
                  node.loc.source = extra.source;
              }
              return node;
          },
  
          createArrayExpression: function (elements) {
              return {
                  type: Syntax.ArrayExpression,
                  elements: elements
              };
          },
  
          createAssignmentExpression: function (operator, left, right) {
              return {
                  type: Syntax.AssignmentExpression,
                  operator: operator,
                  left: left,
                  right: right
              };
          },
  
          createBinaryExpression: function (operator, left, right) {
              var type = (operator === '||' || operator === '&&') ? Syntax.LogicalExpression :
                          Syntax.BinaryExpression;
              return {
                  type: type,
                  operator: operator,
                  left: left,
                  right: right
              };
          },
  
          createBlockStatement: function (body) {
              return {
                  type: Syntax.BlockStatement,
                  body: body
              };
          },
  
          createBreakStatement: function (label) {
              return {
                  type: Syntax.BreakStatement,
                  label: label
              };
          },
  
          createCallExpression: function (callee, args) {
              return {
                  type: Syntax.CallExpression,
                  callee: callee,
                  'arguments': args
              };
          },
  
          createCatchClause: function (param, body) {
              return {
                  type: Syntax.CatchClause,
                  param: param,
                  body: body
              };
          },
  
          createConditionalExpression: function (test, consequent, alternate) {
              return {
                  type: Syntax.ConditionalExpression,
                  test: test,
                  consequent: consequent,
                  alternate: alternate
              };
          },
  
          createContinueStatement: function (label) {
              return {
                  type: Syntax.ContinueStatement,
                  label: label
              };
          },
  
          createDebuggerStatement: function () {
              return {
                  type: Syntax.DebuggerStatement
              };
          },
  
          createDoWhileStatement: function (body, test) {
              return {
                  type: Syntax.DoWhileStatement,
                  body: body,
                  test: test
              };
          },
  
          createEmptyStatement: function () {
              return {
                  type: Syntax.EmptyStatement
              };
          },
  
          createExpressionStatement: function (expression) {
              return {
                  type: Syntax.ExpressionStatement,
                  expression: expression
              };
          },
  
          createForStatement: function (init, test, update, body) {
              return {
                  type: Syntax.ForStatement,
                  init: init,
                  test: test,
                  update: update,
                  body: body
              };
          },
  
          createForInStatement: function (left, right, body) {
              return {
                  type: Syntax.ForInStatement,
                  left: left,
                  right: right,
                  body: body,
                  each: false
              };
          },
  
          createFunctionDeclaration: function (id, params, defaults, body) {
              return {
                  type: Syntax.FunctionDeclaration,
                  id: id,
                  params: params,
                  defaults: defaults,
                  body: body,
                  rest: null,
                  generator: false,
                  expression: false
              };
          },
  
          createFunctionExpression: function (id, params, defaults, body) {
              return {
                  type: Syntax.FunctionExpression,
                  id: id,
                  params: params,
                  defaults: defaults,
                  body: body,
                  rest: null,
                  generator: false,
                  expression: false
              };
          },
  
          createIdentifier: function (name) {
              return {
                  type: Syntax.Identifier,
                  name: name
              };
          },
  
          createIfStatement: function (test, consequent, alternate) {
              return {
                  type: Syntax.IfStatement,
                  test: test,
                  consequent: consequent,
                  alternate: alternate
              };
          },
  
          createLabeledStatement: function (label, body) {
              return {
                  type: Syntax.LabeledStatement,
                  label: label,
                  body: body
              };
          },
  
          createLiteral: function (token) {
              return {
                  type: Syntax.Literal,
                  value: token.value,
                  raw: source.slice(token.start, token.end)
              };
          },
  
          createMemberExpression: function (accessor, object, property) {
              return {
                  type: Syntax.MemberExpression,
                  computed: accessor === '[',
                  object: object,
                  property: property
              };
          },
  
          createNewExpression: function (callee, args) {
              return {
                  type: Syntax.NewExpression,
                  callee: callee,
                  'arguments': args
              };
          },
  
          createObjectExpression: function (properties) {
              return {
                  type: Syntax.ObjectExpression,
                  properties: properties
              };
          },
  
          createPostfixExpression: function (operator, argument) {
              return {
                  type: Syntax.UpdateExpression,
                  operator: operator,
                  argument: argument,
                  prefix: false
              };
          },
  
          createProgram: function (body) {
              return {
                  type: Syntax.Program,
                  body: body
              };
          },
  
          createProperty: function (kind, key, value) {
              return {
                  type: Syntax.Property,
                  key: key,
                  value: value,
                  kind: kind
              };
          },
  
          createReturnStatement: function (argument) {
              return {
                  type: Syntax.ReturnStatement,
                  argument: argument
              };
          },
  
          createSequenceExpression: function (expressions) {
              return {
                  type: Syntax.SequenceExpression,
                  expressions: expressions
              };
          },
  
          createSwitchCase: function (test, consequent) {
              return {
                  type: Syntax.SwitchCase,
                  test: test,
                  consequent: consequent
              };
          },
  
          createSwitchStatement: function (discriminant, cases) {
              return {
                  type: Syntax.SwitchStatement,
                  discriminant: discriminant,
                  cases: cases
              };
          },
  
          createThisExpression: function () {
              return {
                  type: Syntax.ThisExpression
              };
          },
  
          createThrowStatement: function (argument) {
              return {
                  type: Syntax.ThrowStatement,
                  argument: argument
              };
          },
  
          createTryStatement: function (block, guardedHandlers, handlers, finalizer) {
              return {
                  type: Syntax.TryStatement,
                  block: block,
                  guardedHandlers: guardedHandlers,
                  handlers: handlers,
                  finalizer: finalizer
              };
          },
  
          createUnaryExpression: function (operator, argument) {
              if (operator === '++' || operator === '--') {
                  return {
                      type: Syntax.UpdateExpression,
                      operator: operator,
                      argument: argument,
                      prefix: true
                  };
              }
              return {
                  type: Syntax.UnaryExpression,
                  operator: operator,
                  argument: argument,
                  prefix: true
              };
          },
  
          createVariableDeclaration: function (declarations, kind) {
              return {
                  type: Syntax.VariableDeclaration,
                  declarations: declarations,
                  kind: kind
              };
          },
  
          createVariableDeclarator: function (id, init) {
              return {
                  type: Syntax.VariableDeclarator,
                  id: id,
                  init: init
              };
          },
  
          createWhileStatement: function (test, body) {
              return {
                  type: Syntax.WhileStatement,
                  test: test,
                  body: body
              };
          },
  
          createWithStatement: function (object, body) {
              return {
                  type: Syntax.WithStatement,
                  object: object,
                  body: body
              };
          }
      };
  
      // Return true if there is a line terminator before the next token.
  
      function peekLineTerminator() {
          var pos, line, start, found;
  
          pos = index;
          line = lineNumber;
          start = lineStart;
          skipComment();
          found = lineNumber !== line;
          index = pos;
          lineNumber = line;
          lineStart = start;
  
          return found;
      }
  
      // Throw an exception
  
      function throwError(token, messageFormat) {
          var error,
              args = Array.prototype.slice.call(arguments, 2),
              msg = messageFormat.replace(
                  /%(\d)/g,
                  function (whole, index) {
                      assert(index < args.length, 'Message reference must be in range');
                      return args[index];
                  }
              );
  
          if (typeof token.lineNumber === 'number') {
              error = new Error('Line ' + token.lineNumber + ': ' + msg);
              error.index = token.start;
              error.lineNumber = token.lineNumber;
              error.column = token.start - lineStart + 1;
          } else {
              error = new Error('Line ' + lineNumber + ': ' + msg);
              error.index = index;
              error.lineNumber = lineNumber;
              error.column = index - lineStart + 1;
          }
  
          error.description = msg;
          throw error;
      }
  
      function throwErrorTolerant() {
          try {
              throwError.apply(null, arguments);
          } catch (e) {
              if (extra.errors) {
                  extra.errors.push(e);
              } else {
                  throw e;
              }
          }
      }
  
  
      // Throw an exception because of the token.
  
      function throwUnexpected(token) {
          if (token.type === Token.EOF) {
              throwError(token, Messages.UnexpectedEOS);
          }
  
          if (token.type === Token.NumericLiteral) {
              throwError(token, Messages.UnexpectedNumber);
          }
  
          if (token.type === Token.StringLiteral) {
              throwError(token, Messages.UnexpectedString);
          }
  
          if (token.type === Token.Identifier) {
              throwError(token, Messages.UnexpectedIdentifier);
          }
  
          if (token.type === Token.Keyword) {
              if (isFutureReservedWord(token.value)) {
                  throwError(token, Messages.UnexpectedReserved);
              } else if (strict && isStrictModeReservedWord(token.value)) {
                  throwErrorTolerant(token, Messages.StrictReservedWord);
                  return;
              }
              throwError(token, Messages.UnexpectedToken, token.value);
          }
  
          // BooleanLiteral, NullLiteral, or Punctuator.
          throwError(token, Messages.UnexpectedToken, token.value);
      }
  
      // Expect the next token to match the specified punctuator.
      // If not, an exception will be thrown.
  
      function expect(value) {
          var token = lex();
          if (token.type !== Token.Punctuator || token.value !== value) {
              throwUnexpected(token);
          }
      }
  
      // Expect the next token to match the specified keyword.
      // If not, an exception will be thrown.
  
      function expectKeyword(keyword) {
          var token = lex();
          if (token.type !== Token.Keyword || token.value !== keyword) {
              throwUnexpected(token);
          }
      }
  
      // Return true if the next token matches the specified punctuator.
  
      function match(value) {
          return lookahead.type === Token.Punctuator && lookahead.value === value;
      }
  
      // Return true if the next token matches the specified keyword
  
      function matchKeyword(keyword) {
          return lookahead.type === Token.Keyword && lookahead.value === keyword;
      }
  
      // Return true if the next token is an assignment operator
  
      function matchAssign() {
          var op;
  
          if (lookahead.type !== Token.Punctuator) {
              return false;
          }
          op = lookahead.value;
          return op === '=' ||
              op === '*=' ||
              op === '/=' ||
              op === '%=' ||
              op === '+=' ||
              op === '-=' ||
              op === '<<=' ||
              op === '>>=' ||
              op === '>>>=' ||
              op === '&=' ||
              op === '^=' ||
              op === '|=';
      }
  
      function consumeSemicolon() {
          var line;
  
          // Catch the very common case first: immediately a semicolon (U+003B).
          if (source.charCodeAt(index) === 0x3B || match(';')) {
              lex();
              return;
          }
  
          line = lineNumber;
          skipComment();
          if (lineNumber !== line) {
              return;
          }
  
          if (lookahead.type !== Token.EOF && !match('}')) {
              throwUnexpected(lookahead);
          }
      }
  
      // Return true if provided expression is LeftHandSideExpression
  
      function isLeftHandSide(expr) {
          return expr.type === Syntax.Identifier || expr.type === Syntax.MemberExpression;
      }
  
      // 11.1.4 Array Initialiser
  
      function parseArrayInitialiser() {
          var elements = [], startToken;
  
          startToken = lookahead;
          expect('[');
  
          while (!match(']')) {
              if (match(',')) {
                  lex();
                  elements.push(null);
              } else {
                  elements.push(parseAssignmentExpression());
  
                  if (!match(']')) {
                      expect(',');
                  }
              }
          }
  
          lex();
  
          return delegate.markEnd(delegate.createArrayExpression(elements), startToken);
      }
  
      // 11.1.5 Object Initialiser
  
      function parsePropertyFunction(param, first) {
          var previousStrict, body, startToken;
  
          previousStrict = strict;
          startToken = lookahead;
          body = parseFunctionSourceElements();
          if (first && strict && isRestrictedWord(param[0].name)) {
              throwErrorTolerant(first, Messages.StrictParamName);
          }
          strict = previousStrict;
          return delegate.markEnd(delegate.createFunctionExpression(null, param, [], body), startToken);
      }
  
      function parseObjectPropertyKey() {
          var token, startToken;
  
          startToken = lookahead;
          token = lex();
  
          // Note: This function is called only from parseObjectProperty(), where
          // EOF and Punctuator tokens are already filtered out.
  
          if (token.type === Token.StringLiteral || token.type === Token.NumericLiteral) {
              if (strict && token.octal) {
                  throwErrorTolerant(token, Messages.StrictOctalLiteral);
              }
              return delegate.markEnd(delegate.createLiteral(token), startToken);
          }
  
          return delegate.markEnd(delegate.createIdentifier(token.value), startToken);
      }
  
      function parseObjectProperty() {
          var token, key, id, value, param, startToken;
  
          token = lookahead;
          startToken = lookahead;
  
          if (token.type === Token.Identifier) {
  
              id = parseObjectPropertyKey();
  
              // Property Assignment: Getter and Setter.
  
              if (token.value === 'get' && !match(':')) {
                  key = parseObjectPropertyKey();
                  expect('(');
                  expect(')');
                  value = parsePropertyFunction([]);
                  return delegate.markEnd(delegate.createProperty('get', key, value), startToken);
              }
              if (token.value === 'set' && !match(':')) {
                  key = parseObjectPropertyKey();
                  expect('(');
                  token = lookahead;
                  if (token.type !== Token.Identifier) {
                      expect(')');
                      throwErrorTolerant(token, Messages.UnexpectedToken, token.value);
                      value = parsePropertyFunction([]);
                  } else {
                      param = [ parseVariableIdentifier() ];
                      expect(')');
                      value = parsePropertyFunction(param, token);
                  }
                  return delegate.markEnd(delegate.createProperty('set', key, value), startToken);
              }
              expect(':');
              value = parseAssignmentExpression();
              return delegate.markEnd(delegate.createProperty('init', id, value), startToken);
          }
          if (token.type === Token.EOF || token.type === Token.Punctuator) {
              throwUnexpected(token);
          } else {
              key = parseObjectPropertyKey();
              expect(':');
              value = parseAssignmentExpression();
              return delegate.markEnd(delegate.createProperty('init', key, value), startToken);
          }
      }
  
      function parseObjectInitialiser() {
          var properties = [], property, name, key, kind, map = {}, toString = String, startToken;
  
          startToken = lookahead;
  
          expect('{');
  
          while (!match('}')) {
              property = parseObjectProperty();
  
              if (property.key.type === Syntax.Identifier) {
                  name = property.key.name;
              } else {
                  name = toString(property.key.value);
              }
              kind = (property.kind === 'init') ? PropertyKind.Data : (property.kind === 'get') ? PropertyKind.Get : PropertyKind.Set;
  
              key = '$' + name;
              if (Object.prototype.hasOwnProperty.call(map, key)) {
                  if (map[key] === PropertyKind.Data) {
                      if (strict && kind === PropertyKind.Data) {
                          throwErrorTolerant({}, Messages.StrictDuplicateProperty);
                      } else if (kind !== PropertyKind.Data) {
                          throwErrorTolerant({}, Messages.AccessorDataProperty);
                      }
                  } else {
                      if (kind === PropertyKind.Data) {
                          throwErrorTolerant({}, Messages.AccessorDataProperty);
                      } else if (map[key] & kind) {
                          throwErrorTolerant({}, Messages.AccessorGetSet);
                      }
                  }
                  map[key] |= kind;
              } else {
                  map[key] = kind;
              }
  
              properties.push(property);
  
              if (!match('}')) {
                  expect(',');
              }
          }
  
          expect('}');
  
          return delegate.markEnd(delegate.createObjectExpression(properties), startToken);
      }
  
      // 11.1.6 The Grouping Operator
  
      function parseGroupExpression() {
          var expr;
  
          expect('(');
  
          expr = parseExpression();
  
          expect(')');
  
          return expr;
      }
  
  
      // 11.1 Primary Expressions
  
      function parsePrimaryExpression() {
          var type, token, expr, startToken;
  
          if (match('(')) {
              return parseGroupExpression();
          }
  
          if (match('[')) {
              return parseArrayInitialiser();
          }
  
          if (match('{')) {
              return parseObjectInitialiser();
          }
  
          type = lookahead.type;
          startToken = lookahead;
  
          if (type === Token.Identifier) {
              expr =  delegate.createIdentifier(lex().value);
          } else if (type === Token.StringLiteral || type === Token.NumericLiteral) {
              if (strict && lookahead.octal) {
                  throwErrorTolerant(lookahead, Messages.StrictOctalLiteral);
              }
              expr = delegate.createLiteral(lex());
          } else if (type === Token.Keyword) {
              if (matchKeyword('function')) {
                  return parseFunctionExpression();
              }
              if (matchKeyword('this')) {
                  lex();
                  expr = delegate.createThisExpression();
              } else {
                  throwUnexpected(lex());
              }
          } else if (type === Token.BooleanLiteral) {
              token = lex();
              token.value = (token.value === 'true');
              expr = delegate.createLiteral(token);
          } else if (type === Token.NullLiteral) {
              token = lex();
              token.value = null;
              expr = delegate.createLiteral(token);
          } else if (match('/') || match('/=')) {
              if (typeof extra.tokens !== 'undefined') {
                  expr = delegate.createLiteral(collectRegex());
              } else {
                  expr = delegate.createLiteral(scanRegExp());
              }
              peek();
          } else {
              throwUnexpected(lex());
          }
  
          return delegate.markEnd(expr, startToken);
      }
  
      // 11.2 Left-Hand-Side Expressions
  
      function parseArguments() {
          var args = [];
  
          expect('(');
  
          if (!match(')')) {
              while (index < length) {
                  args.push(parseAssignmentExpression());
                  if (match(')')) {
                      break;
                  }
                  expect(',');
              }
          }
  
          expect(')');
  
          return args;
      }
  
      function parseNonComputedProperty() {
          var token, startToken;
  
          startToken = lookahead;
          token = lex();
  
          if (!isIdentifierName(token)) {
              throwUnexpected(token);
          }
  
          return delegate.markEnd(delegate.createIdentifier(token.value), startToken);
      }
  
      function parseNonComputedMember() {
          expect('.');
  
          return parseNonComputedProperty();
      }
  
      function parseComputedMember() {
          var expr;
  
          expect('[');
  
          expr = parseExpression();
  
          expect(']');
  
          return expr;
      }
  
      function parseNewExpression() {
          var callee, args, startToken;
  
          startToken = lookahead;
          expectKeyword('new');
          callee = parseLeftHandSideExpression();
          args = match('(') ? parseArguments() : [];
  
          return delegate.markEnd(delegate.createNewExpression(callee, args), startToken);
      }
  
      function parseLeftHandSideExpressionAllowCall() {
          var previousAllowIn, expr, args, property, startToken;
  
          startToken = lookahead;
  
          previousAllowIn = state.allowIn;
          state.allowIn = true;
          expr = matchKeyword('new') ? parseNewExpression() : parsePrimaryExpression();
          state.allowIn = previousAllowIn;
  
          for (;;) {
              if (match('.')) {
                  property = parseNonComputedMember();
                  expr = delegate.createMemberExpression('.', expr, property);
              } else if (match('(')) {
                  args = parseArguments();
                  expr = delegate.createCallExpression(expr, args);
              } else if (match('[')) {
                  property = parseComputedMember();
                  expr = delegate.createMemberExpression('[', expr, property);
              } else {
                  break;
              }
              delegate.markEnd(expr, startToken);
          }
  
          return expr;
      }
  
      function parseLeftHandSideExpression() {
          var previousAllowIn, expr, property, startToken;
  
          startToken = lookahead;
  
          previousAllowIn = state.allowIn;
          expr = matchKeyword('new') ? parseNewExpression() : parsePrimaryExpression();
          state.allowIn = previousAllowIn;
  
          while (match('.') || match('[')) {
              if (match('[')) {
                  property = parseComputedMember();
                  expr = delegate.createMemberExpression('[', expr, property);
              } else {
                  property = parseNonComputedMember();
                  expr = delegate.createMemberExpression('.', expr, property);
              }
              delegate.markEnd(expr, startToken);
          }
  
          return expr;
      }
  
      // 11.3 Postfix Expressions
  
      function parsePostfixExpression() {
          var expr, token, startToken = lookahead;
  
          expr = parseLeftHandSideExpressionAllowCall();
  
          if (lookahead.type === Token.Punctuator) {
              if ((match('++') || match('--')) && !peekLineTerminator()) {
                  // 11.3.1, 11.3.2
                  if (strict && expr.type === Syntax.Identifier && isRestrictedWord(expr.name)) {
                      throwErrorTolerant({}, Messages.StrictLHSPostfix);
                  }
  
                  if (!isLeftHandSide(expr)) {
                      throwErrorTolerant({}, Messages.InvalidLHSInAssignment);
                  }
  
                  token = lex();
                  expr = delegate.markEnd(delegate.createPostfixExpression(token.value, expr), startToken);
              }
          }
  
          return expr;
      }
  
      // 11.4 Unary Operators
  
      function parseUnaryExpression() {
          var token, expr, startToken;
  
          if (lookahead.type !== Token.Punctuator && lookahead.type !== Token.Keyword) {
              expr = parsePostfixExpression();
          } else if (match('++') || match('--')) {
              startToken = lookahead;
              token = lex();
              expr = parseUnaryExpression();
              // 11.4.4, 11.4.5
              if (strict && expr.type === Syntax.Identifier && isRestrictedWord(expr.name)) {
                  throwErrorTolerant({}, Messages.StrictLHSPrefix);
              }
  
              if (!isLeftHandSide(expr)) {
                  throwErrorTolerant({}, Messages.InvalidLHSInAssignment);
              }
  
              expr = delegate.createUnaryExpression(token.value, expr);
              expr = delegate.markEnd(expr, startToken);
          } else if (match('+') || match('-') || match('~') || match('!')) {
              startToken = lookahead;
              token = lex();
              expr = parseUnaryExpression();
              expr = delegate.createUnaryExpression(token.value, expr);
              expr = delegate.markEnd(expr, startToken);
          } else if (matchKeyword('delete') || matchKeyword('void') || matchKeyword('typeof')) {
              startToken = lookahead;
              token = lex();
              expr = parseUnaryExpression();
              expr = delegate.createUnaryExpression(token.value, expr);
              expr = delegate.markEnd(expr, startToken);
              if (strict && expr.operator === 'delete' && expr.argument.type === Syntax.Identifier) {
                  throwErrorTolerant({}, Messages.StrictDelete);
              }
          } else {
              expr = parsePostfixExpression();
          }
  
          return expr;
      }
  
      function binaryPrecedence(token, allowIn) {
          var prec = 0;
  
          if (token.type !== Token.Punctuator && token.type !== Token.Keyword) {
              return 0;
          }
  
          switch (token.value) {
          case '||':
              prec = 1;
              break;
  
          case '&&':
              prec = 2;
              break;
  
          case '|':
              prec = 3;
              break;
  
          case '^':
              prec = 4;
              break;
  
          case '&':
              prec = 5;
              break;
  
          case '==':
          case '!=':
          case '===':
          case '!==':
              prec = 6;
              break;
  
          case '<':
          case '>':
          case '<=':
          case '>=':
          case 'instanceof':
              prec = 7;
              break;
  
          case 'in':
              prec = allowIn ? 7 : 0;
              break;
  
          case '<<':
          case '>>':
          case '>>>':
              prec = 8;
              break;
  
          case '+':
          case '-':
              prec = 9;
              break;
  
          case '*':
          case '/':
          case '%':
              prec = 11;
              break;
  
          default:
              break;
          }
  
          return prec;
      }
  
      // 11.5 Multiplicative Operators
      // 11.6 Additive Operators
      // 11.7 Bitwise Shift Operators
      // 11.8 Relational Operators
      // 11.9 Equality Operators
      // 11.10 Binary Bitwise Operators
      // 11.11 Binary Logical Operators
  
      function parseBinaryExpression() {
          var marker, markers, expr, token, prec, stack, right, operator, left, i;
  
          marker = lookahead;
          left = parseUnaryExpression();
  
          token = lookahead;
          prec = binaryPrecedence(token, state.allowIn);
          if (prec === 0) {
              return left;
          }
          token.prec = prec;
          lex();
  
          markers = [marker, lookahead];
          right = parseUnaryExpression();
  
          stack = [left, token, right];
  
          while ((prec = binaryPrecedence(lookahead, state.allowIn)) > 0) {
  
              // Reduce: make a binary expression from the three topmost entries.
              while ((stack.length > 2) && (prec <= stack[stack.length - 2].prec)) {
                  right = stack.pop();
                  operator = stack.pop().value;
                  left = stack.pop();
                  expr = delegate.createBinaryExpression(operator, left, right);
                  markers.pop();
                  marker = markers[markers.length - 1];
                  delegate.markEnd(expr, marker);
                  stack.push(expr);
              }
  
              // Shift.
              token = lex();
              token.prec = prec;
              stack.push(token);
              markers.push(lookahead);
              expr = parseUnaryExpression();
              stack.push(expr);
          }
  
          // Final reduce to clean-up the stack.
          i = stack.length - 1;
          expr = stack[i];
          markers.pop();
          while (i > 1) {
              expr = delegate.createBinaryExpression(stack[i - 1].value, stack[i - 2], expr);
              i -= 2;
              marker = markers.pop();
              delegate.markEnd(expr, marker);
          }
  
          return expr;
      }
  
  
      // 11.12 Conditional Operator
  
      function parseConditionalExpression() {
          var expr, previousAllowIn, consequent, alternate, startToken;
  
          startToken = lookahead;
  
          expr = parseBinaryExpression();
  
          if (match('?')) {
              lex();
              previousAllowIn = state.allowIn;
              state.allowIn = true;
              consequent = parseAssignmentExpression();
              state.allowIn = previousAllowIn;
              expect(':');
              alternate = parseAssignmentExpression();
  
              expr = delegate.createConditionalExpression(expr, consequent, alternate);
              delegate.markEnd(expr, startToken);
          }
  
          return expr;
      }
  
      // 11.13 Assignment Operators
  
      function parseAssignmentExpression() {
          var token, left, right, node, startToken;
  
          token = lookahead;
          startToken = lookahead;
  
          node = left = parseConditionalExpression();
  
          if (matchAssign()) {
              // LeftHandSideExpression
              if (!isLeftHandSide(left)) {
                  throwErrorTolerant({}, Messages.InvalidLHSInAssignment);
              }
  
              // 11.13.1
              if (strict && left.type === Syntax.Identifier && isRestrictedWord(left.name)) {
                  throwErrorTolerant(token, Messages.StrictLHSAssignment);
              }
  
              token = lex();
              right = parseAssignmentExpression();
              node = delegate.markEnd(delegate.createAssignmentExpression(token.value, left, right), startToken);
          }
  
          return node;
      }
  
      // 11.14 Comma Operator
  
      function parseExpression() {
          var expr, startToken = lookahead;
  
          expr = parseAssignmentExpression();
  
          if (match(',')) {
              expr = delegate.createSequenceExpression([ expr ]);
  
              while (index < length) {
                  if (!match(',')) {
                      break;
                  }
                  lex();
                  expr.expressions.push(parseAssignmentExpression());
              }
  
              delegate.markEnd(expr, startToken);
          }
  
          return expr;
      }
  
      // 12.1 Block
  
      function parseStatementList() {
          var list = [],
              statement;
  
          while (index < length) {
              if (match('}')) {
                  break;
              }
              statement = parseSourceElement();
              if (typeof statement === 'undefined') {
                  break;
              }
              list.push(statement);
          }
  
          return list;
      }
  
      function parseBlock() {
          var block, startToken;
  
          startToken = lookahead;
          expect('{');
  
          block = parseStatementList();
  
          expect('}');
  
          return delegate.markEnd(delegate.createBlockStatement(block), startToken);
      }
  
      // 12.2 Variable Statement
  
      function parseVariableIdentifier() {
          var token, startToken;
  
          startToken = lookahead;
          token = lex();
  
          if (token.type !== Token.Identifier) {
              throwUnexpected(token);
          }
  
          return delegate.markEnd(delegate.createIdentifier(token.value), startToken);
      }
  
      function parseVariableDeclaration(kind) {
          var init = null, id, startToken;
  
          startToken = lookahead;
          id = parseVariableIdentifier();
  
          // 12.2.1
          if (strict && isRestrictedWord(id.name)) {
              throwErrorTolerant({}, Messages.StrictVarName);
          }
  
          if (kind === 'const') {
              expect('=');
              init = parseAssignmentExpression();
          } else if (match('=')) {
              lex();
              init = parseAssignmentExpression();
          }
  
          return delegate.markEnd(delegate.createVariableDeclarator(id, init), startToken);
      }
  
      function parseVariableDeclarationList(kind) {
          var list = [];
  
          do {
              list.push(parseVariableDeclaration(kind));
              if (!match(',')) {
                  break;
              }
              lex();
          } while (index < length);
  
          return list;
      }
  
      function parseVariableStatement() {
          var declarations;
  
          expectKeyword('var');
  
          declarations = parseVariableDeclarationList();
  
          consumeSemicolon();
  
          return delegate.createVariableDeclaration(declarations, 'var');
      }
  
      // kind may be `const` or `let`
      // Both are experimental and not in the specification yet.
      // see http://wiki.ecmascript.org/doku.php?id=harmony:const
      // and http://wiki.ecmascript.org/doku.php?id=harmony:let
      function parseConstLetDeclaration(kind) {
          var declarations, startToken;
  
          startToken = lookahead;
  
          expectKeyword(kind);
  
          declarations = parseVariableDeclarationList(kind);
  
          consumeSemicolon();
  
          return delegate.markEnd(delegate.createVariableDeclaration(declarations, kind), startToken);
      }
  
      // 12.3 Empty Statement
  
      function parseEmptyStatement() {
          expect(';');
          return delegate.createEmptyStatement();
      }
  
      // 12.4 Expression Statement
  
      function parseExpressionStatement() {
          var expr = parseExpression();
          consumeSemicolon();
          return delegate.createExpressionStatement(expr);
      }
  
      // 12.5 If statement
  
      function parseIfStatement() {
          var test, consequent, alternate;
  
          expectKeyword('if');
  
          expect('(');
  
          test = parseExpression();
  
          expect(')');
  
          consequent = parseStatement();
  
          if (matchKeyword('else')) {
              lex();
              alternate = parseStatement();
          } else {
              alternate = null;
          }
  
          return delegate.createIfStatement(test, consequent, alternate);
      }
  
      // 12.6 Iteration Statements
  
      function parseDoWhileStatement() {
          var body, test, oldInIteration;
  
          expectKeyword('do');
  
          oldInIteration = state.inIteration;
          state.inIteration = true;
  
          body = parseStatement();
  
          state.inIteration = oldInIteration;
  
          expectKeyword('while');
  
          expect('(');
  
          test = parseExpression();
  
          expect(')');
  
          if (match(';')) {
              lex();
          }
  
          return delegate.createDoWhileStatement(body, test);
      }
  
      function parseWhileStatement() {
          var test, body, oldInIteration;
  
          expectKeyword('while');
  
          expect('(');
  
          test = parseExpression();
  
          expect(')');
  
          oldInIteration = state.inIteration;
          state.inIteration = true;
  
          body = parseStatement();
  
          state.inIteration = oldInIteration;
  
          return delegate.createWhileStatement(test, body);
      }
  
      function parseForVariableDeclaration() {
          var token, declarations, startToken;
  
          startToken = lookahead;
          token = lex();
          declarations = parseVariableDeclarationList();
  
          return delegate.markEnd(delegate.createVariableDeclaration(declarations, token.value), startToken);
      }
  
      function parseForStatement() {
          var init, test, update, left, right, body, oldInIteration;
  
          init = test = update = null;
  
          expectKeyword('for');
  
          expect('(');
  
          if (match(';')) {
              lex();
          } else {
              if (matchKeyword('var') || matchKeyword('let')) {
                  state.allowIn = false;
                  init = parseForVariableDeclaration();
                  state.allowIn = true;
  
                  if (init.declarations.length === 1 && matchKeyword('in')) {
                      lex();
                      left = init;
                      right = parseExpression();
                      init = null;
                  }
              } else {
                  state.allowIn = false;
                  init = parseExpression();
                  state.allowIn = true;
  
                  if (matchKeyword('in')) {
                      // LeftHandSideExpression
                      if (!isLeftHandSide(init)) {
                          throwErrorTolerant({}, Messages.InvalidLHSInForIn);
                      }
  
                      lex();
                      left = init;
                      right = parseExpression();
                      init = null;
                  }
              }
  
              if (typeof left === 'undefined') {
                  expect(';');
              }
          }
  
          if (typeof left === 'undefined') {
  
              if (!match(';')) {
                  test = parseExpression();
              }
              expect(';');
  
              if (!match(')')) {
                  update = parseExpression();
              }
          }
  
          expect(')');
  
          oldInIteration = state.inIteration;
          state.inIteration = true;
  
          body = parseStatement();
  
          state.inIteration = oldInIteration;
  
          return (typeof left === 'undefined') ?
                  delegate.createForStatement(init, test, update, body) :
                  delegate.createForInStatement(left, right, body);
      }
  
      // 12.7 The continue statement
  
      function parseContinueStatement() {
          var label = null, key;
  
          expectKeyword('continue');
  
          // Optimize the most common form: 'continue;'.
          if (source.charCodeAt(index) === 0x3B) {
              lex();
  
              if (!state.inIteration) {
                  throwError({}, Messages.IllegalContinue);
              }
  
              return delegate.createContinueStatement(null);
          }
  
          if (peekLineTerminator()) {
              if (!state.inIteration) {
                  throwError({}, Messages.IllegalContinue);
              }
  
              return delegate.createContinueStatement(null);
          }
  
          if (lookahead.type === Token.Identifier) {
              label = parseVariableIdentifier();
  
              key = '$' + label.name;
              if (!Object.prototype.hasOwnProperty.call(state.labelSet, key)) {
                  throwError({}, Messages.UnknownLabel, label.name);
              }
          }
  
          consumeSemicolon();
  
          if (label === null && !state.inIteration) {
              throwError({}, Messages.IllegalContinue);
          }
  
          return delegate.createContinueStatement(label);
      }
  
      // 12.8 The break statement
  
      function parseBreakStatement() {
          var label = null, key;
  
          expectKeyword('break');
  
          // Catch the very common case first: immediately a semicolon (U+003B).
          if (source.charCodeAt(index) === 0x3B) {
              lex();
  
              if (!(state.inIteration || state.inSwitch)) {
                  throwError({}, Messages.IllegalBreak);
              }
  
              return delegate.createBreakStatement(null);
          }
  
          if (peekLineTerminator()) {
              if (!(state.inIteration || state.inSwitch)) {
                  throwError({}, Messages.IllegalBreak);
              }
  
              return delegate.createBreakStatement(null);
          }
  
          if (lookahead.type === Token.Identifier) {
              label = parseVariableIdentifier();
  
              key = '$' + label.name;
              if (!Object.prototype.hasOwnProperty.call(state.labelSet, key)) {
                  throwError({}, Messages.UnknownLabel, label.name);
              }
          }
  
          consumeSemicolon();
  
          if (label === null && !(state.inIteration || state.inSwitch)) {
              throwError({}, Messages.IllegalBreak);
          }
  
          return delegate.createBreakStatement(label);
      }
  
      // 12.9 The return statement
  
      function parseReturnStatement() {
          var argument = null;
  
          expectKeyword('return');
  
          if (!state.inFunctionBody) {
              throwErrorTolerant({}, Messages.IllegalReturn);
          }
  
          // 'return' followed by a space and an identifier is very common.
          if (source.charCodeAt(index) === 0x20) {
              if (isIdentifierStart(source.charCodeAt(index + 1))) {
                  argument = parseExpression();
                  consumeSemicolon();
                  return delegate.createReturnStatement(argument);
              }
          }
  
          if (peekLineTerminator()) {
              return delegate.createReturnStatement(null);
          }
  
          if (!match(';')) {
              if (!match('}') && lookahead.type !== Token.EOF) {
                  argument = parseExpression();
              }
          }
  
          consumeSemicolon();
  
          return delegate.createReturnStatement(argument);
      }
  
      // 12.10 The with statement
  
      function parseWithStatement() {
          var object, body;
  
          if (strict) {
              // TODO(ikarienator): Should we update the test cases instead?
              skipComment();
              throwErrorTolerant({}, Messages.StrictModeWith);
          }
  
          expectKeyword('with');
  
          expect('(');
  
          object = parseExpression();
  
          expect(')');
  
          body = parseStatement();
  
          return delegate.createWithStatement(object, body);
      }
  
      // 12.10 The swith statement
  
      function parseSwitchCase() {
          var test, consequent = [], statement, startToken;
  
          startToken = lookahead;
          if (matchKeyword('default')) {
              lex();
              test = null;
          } else {
              expectKeyword('case');
              test = parseExpression();
          }
          expect(':');
  
          while (index < length) {
              if (match('}') || matchKeyword('default') || matchKeyword('case')) {
                  break;
              }
              statement = parseStatement();
              consequent.push(statement);
          }
  
          return delegate.markEnd(delegate.createSwitchCase(test, consequent), startToken);
      }
  
      function parseSwitchStatement() {
          var discriminant, cases, clause, oldInSwitch, defaultFound;
  
          expectKeyword('switch');
  
          expect('(');
  
          discriminant = parseExpression();
  
          expect(')');
  
          expect('{');
  
          cases = [];
  
          if (match('}')) {
              lex();
              return delegate.createSwitchStatement(discriminant, cases);
          }
  
          oldInSwitch = state.inSwitch;
          state.inSwitch = true;
          defaultFound = false;
  
          while (index < length) {
              if (match('}')) {
                  break;
              }
              clause = parseSwitchCase();
              if (clause.test === null) {
                  if (defaultFound) {
                      throwError({}, Messages.MultipleDefaultsInSwitch);
                  }
                  defaultFound = true;
              }
              cases.push(clause);
          }
  
          state.inSwitch = oldInSwitch;
  
          expect('}');
  
          return delegate.createSwitchStatement(discriminant, cases);
      }
  
      // 12.13 The throw statement
  
      function parseThrowStatement() {
          var argument;
  
          expectKeyword('throw');
  
          if (peekLineTerminator()) {
              throwError({}, Messages.NewlineAfterThrow);
          }
  
          argument = parseExpression();
  
          consumeSemicolon();
  
          return delegate.createThrowStatement(argument);
      }
  
      // 12.14 The try statement
  
      function parseCatchClause() {
          var param, body, startToken;
  
          startToken = lookahead;
          expectKeyword('catch');
  
          expect('(');
          if (match(')')) {
              throwUnexpected(lookahead);
          }
  
          param = parseVariableIdentifier();
          // 12.14.1
          if (strict && isRestrictedWord(param.name)) {
              throwErrorTolerant({}, Messages.StrictCatchVariable);
          }
  
          expect(')');
          body = parseBlock();
          return delegate.markEnd(delegate.createCatchClause(param, body), startToken);
      }
  
      function parseTryStatement() {
          var block, handlers = [], finalizer = null;
  
          expectKeyword('try');
  
          block = parseBlock();
  
          if (matchKeyword('catch')) {
              handlers.push(parseCatchClause());
          }
  
          if (matchKeyword('finally')) {
              lex();
              finalizer = parseBlock();
          }
  
          if (handlers.length === 0 && !finalizer) {
              throwError({}, Messages.NoCatchOrFinally);
          }
  
          return delegate.createTryStatement(block, [], handlers, finalizer);
      }
  
      // 12.15 The debugger statement
  
      function parseDebuggerStatement() {
          expectKeyword('debugger');
  
          consumeSemicolon();
  
          return delegate.createDebuggerStatement();
      }
  
      // 12 Statements
  
      function parseStatement() {
          var type = lookahead.type,
              expr,
              labeledBody,
              key,
              startToken;
  
          if (type === Token.EOF) {
              throwUnexpected(lookahead);
          }
  
          if (type === Token.Punctuator && lookahead.value === '{') {
              return parseBlock();
          }
  
          startToken = lookahead;
  
          if (type === Token.Punctuator) {
              switch (lookahead.value) {
              case ';':
                  return delegate.markEnd(parseEmptyStatement(), startToken);
              case '(':
                  return delegate.markEnd(parseExpressionStatement(), startToken);
              default:
                  break;
              }
          }
  
          if (type === Token.Keyword) {
              switch (lookahead.value) {
              case 'break':
                  return delegate.markEnd(parseBreakStatement(), startToken);
              case 'continue':
                  return delegate.markEnd(parseContinueStatement(), startToken);
              case 'debugger':
                  return delegate.markEnd(parseDebuggerStatement(), startToken);
              case 'do':
                  return delegate.markEnd(parseDoWhileStatement(), startToken);
              case 'for':
                  return delegate.markEnd(parseForStatement(), startToken);
              case 'function':
                  return delegate.markEnd(parseFunctionDeclaration(), startToken);
              case 'if':
                  return delegate.markEnd(parseIfStatement(), startToken);
              case 'return':
                  return delegate.markEnd(parseReturnStatement(), startToken);
              case 'switch':
                  return delegate.markEnd(parseSwitchStatement(), startToken);
              case 'throw':
                  return delegate.markEnd(parseThrowStatement(), startToken);
              case 'try':
                  return delegate.markEnd(parseTryStatement(), startToken);
              case 'var':
                  return delegate.markEnd(parseVariableStatement(), startToken);
              case 'while':
                  return delegate.markEnd(parseWhileStatement(), startToken);
              case 'with':
                  return delegate.markEnd(parseWithStatement(), startToken);
              default:
                  break;
              }
          }
  
          expr = parseExpression();
  
          // 12.12 Labelled Statements
          if ((expr.type === Syntax.Identifier) && match(':')) {
              lex();
  
              key = '$' + expr.name;
              if (Object.prototype.hasOwnProperty.call(state.labelSet, key)) {
                  throwError({}, Messages.Redeclaration, 'Label', expr.name);
              }
  
              state.labelSet[key] = true;
              labeledBody = parseStatement();
              delete state.labelSet[key];
              return delegate.markEnd(delegate.createLabeledStatement(expr, labeledBody), startToken);
          }
  
          consumeSemicolon();
  
          return delegate.markEnd(delegate.createExpressionStatement(expr), startToken);
      }
  
      // 13 Function Definition
  
      function parseFunctionSourceElements() {
          var sourceElement, sourceElements = [], token, directive, firstRestricted,
              oldLabelSet, oldInIteration, oldInSwitch, oldInFunctionBody, startToken;
  
          startToken = lookahead;
          expect('{');
  
          while (index < length) {
              if (lookahead.type !== Token.StringLiteral) {
                  break;
              }
              token = lookahead;
  
              sourceElement = parseSourceElement();
              sourceElements.push(sourceElement);
              if (sourceElement.expression.type !== Syntax.Literal) {
                  // this is not directive
                  break;
              }
              directive = source.slice(token.start + 1, token.end - 1);
              if (directive === 'use strict') {
                  strict = true;
                  if (firstRestricted) {
                      throwErrorTolerant(firstRestricted, Messages.StrictOctalLiteral);
                  }
              } else {
                  if (!firstRestricted && token.octal) {
                      firstRestricted = token;
                  }
              }
          }
  
          oldLabelSet = state.labelSet;
          oldInIteration = state.inIteration;
          oldInSwitch = state.inSwitch;
          oldInFunctionBody = state.inFunctionBody;
  
          state.labelSet = {};
          state.inIteration = false;
          state.inSwitch = false;
          state.inFunctionBody = true;
  
          while (index < length) {
              if (match('}')) {
                  break;
              }
              sourceElement = parseSourceElement();
              if (typeof sourceElement === 'undefined') {
                  break;
              }
              sourceElements.push(sourceElement);
          }
  
          expect('}');
  
          state.labelSet = oldLabelSet;
          state.inIteration = oldInIteration;
          state.inSwitch = oldInSwitch;
          state.inFunctionBody = oldInFunctionBody;
  
          return delegate.markEnd(delegate.createBlockStatement(sourceElements), startToken);
      }
  
      function parseParams(firstRestricted) {
          var param, params = [], token, stricted, paramSet, key, message;
          expect('(');
  
          if (!match(')')) {
              paramSet = {};
              while (index < length) {
                  token = lookahead;
                  param = parseVariableIdentifier();
                  key = '$' + token.value;
                  if (strict) {
                      if (isRestrictedWord(token.value)) {
                          stricted = token;
                          message = Messages.StrictParamName;
                      }
                      if (Object.prototype.hasOwnProperty.call(paramSet, key)) {
                          stricted = token;
                          message = Messages.StrictParamDupe;
                      }
                  } else if (!firstRestricted) {
                      if (isRestrictedWord(token.value)) {
                          firstRestricted = token;
                          message = Messages.StrictParamName;
                      } else if (isStrictModeReservedWord(token.value)) {
                          firstRestricted = token;
                          message = Messages.StrictReservedWord;
                      } else if (Object.prototype.hasOwnProperty.call(paramSet, key)) {
                          firstRestricted = token;
                          message = Messages.StrictParamDupe;
                      }
                  }
                  params.push(param);
                  paramSet[key] = true;
                  if (match(')')) {
                      break;
                  }
                  expect(',');
              }
          }
  
          expect(')');
  
          return {
              params: params,
              stricted: stricted,
              firstRestricted: firstRestricted,
              message: message
          };
      }
  
      function parseFunctionDeclaration() {
          var id, params = [], body, token, stricted, tmp, firstRestricted, message, previousStrict, startToken;
  
          startToken = lookahead;
  
          expectKeyword('function');
          token = lookahead;
          id = parseVariableIdentifier();
          if (strict) {
              if (isRestrictedWord(token.value)) {
                  throwErrorTolerant(token, Messages.StrictFunctionName);
              }
          } else {
              if (isRestrictedWord(token.value)) {
                  firstRestricted = token;
                  message = Messages.StrictFunctionName;
              } else if (isStrictModeReservedWord(token.value)) {
                  firstRestricted = token;
                  message = Messages.StrictReservedWord;
              }
          }
  
          tmp = parseParams(firstRestricted);
          params = tmp.params;
          stricted = tmp.stricted;
          firstRestricted = tmp.firstRestricted;
          if (tmp.message) {
              message = tmp.message;
          }
  
          previousStrict = strict;
          body = parseFunctionSourceElements();
          if (strict && firstRestricted) {
              throwError(firstRestricted, message);
          }
          if (strict && stricted) {
              throwErrorTolerant(stricted, message);
          }
          strict = previousStrict;
  
          return delegate.markEnd(delegate.createFunctionDeclaration(id, params, [], body), startToken);
      }
  
      function parseFunctionExpression() {
          var token, id = null, stricted, firstRestricted, message, tmp, params = [], body, previousStrict, startToken;
  
          startToken = lookahead;
          expectKeyword('function');
  
          if (!match('(')) {
              token = lookahead;
              id = parseVariableIdentifier();
              if (strict) {
                  if (isRestrictedWord(token.value)) {
                      throwErrorTolerant(token, Messages.StrictFunctionName);
                  }
              } else {
                  if (isRestrictedWord(token.value)) {
                      firstRestricted = token;
                      message = Messages.StrictFunctionName;
                  } else if (isStrictModeReservedWord(token.value)) {
                      firstRestricted = token;
                      message = Messages.StrictReservedWord;
                  }
              }
          }
  
          tmp = parseParams(firstRestricted);
          params = tmp.params;
          stricted = tmp.stricted;
          firstRestricted = tmp.firstRestricted;
          if (tmp.message) {
              message = tmp.message;
          }
  
          previousStrict = strict;
          body = parseFunctionSourceElements();
          if (strict && firstRestricted) {
              throwError(firstRestricted, message);
          }
          if (strict && stricted) {
              throwErrorTolerant(stricted, message);
          }
          strict = previousStrict;
  
          return delegate.markEnd(delegate.createFunctionExpression(id, params, [], body), startToken);
      }
  
      // 14 Program
  
      function parseSourceElement() {
          if (lookahead.type === Token.Keyword) {
              switch (lookahead.value) {
              case 'const':
              case 'let':
                  return parseConstLetDeclaration(lookahead.value);
              case 'function':
                  return parseFunctionDeclaration();
              default:
                  return parseStatement();
              }
          }
  
          if (lookahead.type !== Token.EOF) {
              return parseStatement();
          }
      }
  
      function parseSourceElements() {
          var sourceElement, sourceElements = [], token, directive, firstRestricted;
  
          while (index < length) {
              token = lookahead;
              if (token.type !== Token.StringLiteral) {
                  break;
              }
  
              sourceElement = parseSourceElement();
              sourceElements.push(sourceElement);
              if (sourceElement.expression.type !== Syntax.Literal) {
                  // this is not directive
                  break;
              }
              directive = source.slice(token.start + 1, token.end - 1);
              if (directive === 'use strict') {
                  strict = true;
                  if (firstRestricted) {
                      throwErrorTolerant(firstRestricted, Messages.StrictOctalLiteral);
                  }
              } else {
                  if (!firstRestricted && token.octal) {
                      firstRestricted = token;
                  }
              }
          }
  
          while (index < length) {
              sourceElement = parseSourceElement();
              /* istanbul ignore if */
              if (typeof sourceElement === 'undefined') {
                  break;
              }
              sourceElements.push(sourceElement);
          }
          return sourceElements;
      }
  
      function parseProgram() {
          var body, startToken;
  
          skipComment();
          peek();
          startToken = lookahead;
          strict = false;
  
          body = parseSourceElements();
          return delegate.markEnd(delegate.createProgram(body), startToken);
      }
  
      function filterTokenLocation() {
          var i, entry, token, tokens = [];
  
          for (i = 0; i < extra.tokens.length; ++i) {
              entry = extra.tokens[i];
              token = {
                  type: entry.type,
                  value: entry.value
              };
              if (extra.range) {
                  token.range = entry.range;
              }
              if (extra.loc) {
                  token.loc = entry.loc;
              }
              tokens.push(token);
          }
  
          extra.tokens = tokens;
      }
  
      function tokenize(code, options) {
          var toString,
              token,
              tokens;
  
          toString = String;
          if (typeof code !== 'string' && !(code instanceof String)) {
              code = toString(code);
          }
  
          delegate = SyntaxTreeDelegate;
          source = code;
          index = 0;
          lineNumber = (source.length > 0) ? 1 : 0;
          lineStart = 0;
          length = source.length;
          lookahead = null;
          state = {
              allowIn: true,
              labelSet: {},
              inFunctionBody: false,
              inIteration: false,
              inSwitch: false,
              lastCommentStart: -1
          };
  
          extra = {};
  
          // Options matching.
          options = options || {};
  
          // Of course we collect tokens here.
          options.tokens = true;
          extra.tokens = [];
          extra.tokenize = true;
          // The following two fields are necessary to compute the Regex tokens.
          extra.openParenToken = -1;
          extra.openCurlyToken = -1;
  
          extra.range = (typeof options.range === 'boolean') && options.range;
          extra.loc = (typeof options.loc === 'boolean') && options.loc;
  
          if (typeof options.comment === 'boolean' && options.comment) {
              extra.comments = [];
          }
          if (typeof options.tolerant === 'boolean' && options.tolerant) {
              extra.errors = [];
          }
  
          try {
              peek();
              if (lookahead.type === Token.EOF) {
                  return extra.tokens;
              }
  
              token = lex();
              while (lookahead.type !== Token.EOF) {
                  try {
                      token = lex();
                  } catch (lexError) {
                      token = lookahead;
                      if (extra.errors) {
                          extra.errors.push(lexError);
                          // We have to break on the first error
                          // to avoid infinite loops.
                          break;
                      } else {
                          throw lexError;
                      }
                  }
              }
  
              filterTokenLocation();
              tokens = extra.tokens;
              if (typeof extra.comments !== 'undefined') {
                  tokens.comments = extra.comments;
              }
              if (typeof extra.errors !== 'undefined') {
                  tokens.errors = extra.errors;
              }
          } catch (e) {
              throw e;
          } finally {
              extra = {};
          }
          return tokens;
      }
  
      function parse(code, options) {
          var program, toString;
  
          toString = String;
          if (typeof code !== 'string' && !(code instanceof String)) {
              code = toString(code);
          }
  
          delegate = SyntaxTreeDelegate;
          source = code;
          index = 0;
          lineNumber = (source.length > 0) ? 1 : 0;
          lineStart = 0;
          length = source.length;
          lookahead = null;
          state = {
              allowIn: true,
              labelSet: {},
              inFunctionBody: false,
              inIteration: false,
              inSwitch: false,
              lastCommentStart: -1
          };
  
          extra = {};
          if (typeof options !== 'undefined') {
              extra.range = (typeof options.range === 'boolean') && options.range;
              extra.loc = (typeof options.loc === 'boolean') && options.loc;
              extra.attachComment = (typeof options.attachComment === 'boolean') && options.attachComment;
  
              if (extra.loc && options.source !== null && options.source !== undefined) {
                  extra.source = toString(options.source);
              }
  
              if (typeof options.tokens === 'boolean' && options.tokens) {
                  extra.tokens = [];
              }
              if (typeof options.comment === 'boolean' && options.comment) {
                  extra.comments = [];
              }
              if (typeof options.tolerant === 'boolean' && options.tolerant) {
                  extra.errors = [];
              }
              if (extra.attachComment) {
                  extra.range = true;
                  extra.comments = [];
                  extra.bottomRightStack = [];
                  extra.trailingComments = [];
                  extra.leadingComments = [];
              }
          }
  
          try {
              program = parseProgram();
              if (typeof extra.comments !== 'undefined') {
                  program.comments = extra.comments;
              }
              if (typeof extra.tokens !== 'undefined') {
                  filterTokenLocation();
                  program.tokens = extra.tokens;
              }
              if (typeof extra.errors !== 'undefined') {
                  program.errors = extra.errors;
              }
          } catch (e) {
              throw e;
          } finally {
              extra = {};
          }
  
          return program;
      }
  
      // Sync with *.json manifests.
      exports.version = '1.2.2';
  
      exports.tokenize = tokenize;
  
      exports.parse = parse;
  
      // Deep copy.
     /* istanbul ignore next */
      exports.Syntax = (function () {
          var name, types = {};
  
          if (typeof Object.create === 'function') {
              types = Object.create(null);
          }
  
          for (name in Syntax) {
              if (Syntax.hasOwnProperty(name)) {
                  types[name] = Syntax[name];
              }
          }
  
          if (typeof Object.freeze === 'function') {
              Object.freeze(types);
          }
  
          return types;
      }());
  
  }));
  /* vim: set sw=4 ts=4 et tw=80 : */
  
  },{}],1:[function(require,module,exports){
  (function (process){
  /* parser generated by jison 0.4.13 */
  /*
    Returns a Parser object of the following structure:
  
    Parser: {
      yy: {}
    }
  
    Parser.prototype: {
      yy: {},
      trace: function(),
      symbols_: {associative list: name ==> number},
      terminals_: {associative list: number ==> name},
      productions_: [...],
      performAction: function anonymous(yytext, yyleng, yylineno, yy, yystate, $$, _$),
      table: [...],
      defaultActions: {...},
      parseError: function(str, hash),
      parse: function(input),
  
      lexer: {
          EOF: 1,
          parseError: function(str, hash),
          setInput: function(input),
          input: function(),
          unput: function(str),
          more: function(),
          less: function(n),
          pastInput: function(),
          upcomingInput: function(),
          showPosition: function(),
          test_match: function(regex_match_array, rule_index),
          next: function(),
          lex: function(),
          begin: function(condition),
          popState: function(),
          _currentRules: function(),
          topState: function(),
          pushState: function(condition),
  
          options: {
              ranges: boolean           (optional: true ==> token location info will include a .range[] member)
              flex: boolean             (optional: true ==> flex-like lexing behaviour where the rules are tested exhaustively to find the longest match)
              backtrack_lexer: boolean  (optional: true ==> lexer regexes are tested in order and for each matching regex the action code is invoked; the lexer terminates the scan when a token is returned by the action code)
          },
  
          performAction: function(yy, yy_, $avoiding_name_collisions, YY_START),
          rules: [...],
          conditions: {associative list: name ==> set},
      }
    }
  
  
    token location info (@$, _$, etc.): {
      first_line: n,
      last_line: n,
      first_column: n,
      last_column: n,
      range: [start_number, end_number]       (where the numbers are indexes into the input string, regular zero-based)
    }
  
  
    the parseError function receives a 'hash' object with these members for lexer and parser errors: {
      text:        (matched text)
      token:       (the produced terminal token, if any)
      line:        (yylineno)
    }
    while parser (grammar) errors will also provide these members, i.e. parser errors deliver a superset of attributes: {
      loc:         (yylloc)
      expected:    (string describing the set of expected tokens)
      recoverable: (boolean: TRUE when the parser has a error recovery rule available for this particular error)
    }
  */
  var parser = (function(){
  var parser = {trace: function trace() { },
  yy: {},
  symbols_: {"error":2,"JSON_PATH":3,"DOLLAR":4,"PATH_COMPONENTS":5,"LEADING_CHILD_MEMBER_EXPRESSION":6,"PATH_COMPONENT":7,"MEMBER_COMPONENT":8,"SUBSCRIPT_COMPONENT":9,"CHILD_MEMBER_COMPONENT":10,"DESCENDANT_MEMBER_COMPONENT":11,"DOT":12,"MEMBER_EXPRESSION":13,"DOT_DOT":14,"STAR":15,"IDENTIFIER":16,"SCRIPT_EXPRESSION":17,"INTEGER":18,"END":19,"CHILD_SUBSCRIPT_COMPONENT":20,"DESCENDANT_SUBSCRIPT_COMPONENT":21,"[":22,"SUBSCRIPT":23,"]":24,"SUBSCRIPT_EXPRESSION":25,"SUBSCRIPT_EXPRESSION_LIST":26,"SUBSCRIPT_EXPRESSION_LISTABLE":27,",":28,"STRING_LITERAL":29,"ARRAY_SLICE":30,"FILTER_EXPRESSION":31,"QQ_STRING":32,"Q_STRING":33,"$accept":0,"$end":1},
  terminals_: {2:"error",4:"DOLLAR",12:"DOT",14:"DOT_DOT",15:"STAR",16:"IDENTIFIER",17:"SCRIPT_EXPRESSION",18:"INTEGER",19:"END",22:"[",24:"]",28:",",30:"ARRAY_SLICE",31:"FILTER_EXPRESSION",32:"QQ_STRING",33:"Q_STRING"},
  productions_: [0,[3,1],[3,2],[3,1],[3,2],[5,1],[5,2],[7,1],[7,1],[8,1],[8,1],[10,2],[6,1],[11,2],[13,1],[13,1],[13,1],[13,1],[13,1],[9,1],[9,1],[20,3],[21,4],[23,1],[23,1],[26,1],[26,3],[27,1],[27,1],[27,1],[25,1],[25,1],[25,1],[29,1],[29,1]],
  performAction: function anonymous(yytext, yyleng, yylineno, yy, yystate /* action[1] */, $$ /* vstack */, _$ /* lstack */
  /**/) {
  /* this == yyval */
  if (!yy.ast) {
      yy.ast = _ast;
      _ast.initialize();
  }
  
  var $0 = $$.length - 1;
  switch (yystate) {
  case 1:yy.ast.set({ expression: { type: "root", value: $$[$0] } }); yy.ast.unshift(); return yy.ast.yield()
  break;
  case 2:yy.ast.set({ expression: { type: "root", value: $$[$0-1] } }); yy.ast.unshift(); return yy.ast.yield()
  break;
  case 3:yy.ast.unshift(); return yy.ast.yield()
  break;
  case 4:yy.ast.set({ operation: "member", scope: "child", expression: { type: "identifier", value: $$[$0-1] }}); yy.ast.unshift(); return yy.ast.yield()
  break;
  case 5:
  break;
  case 6:
  break;
  case 7:yy.ast.set({ operation: "member" }); yy.ast.push()
  break;
  case 8:yy.ast.set({ operation: "subscript" }); yy.ast.push() 
  break;
  case 9:yy.ast.set({ scope: "child" })
  break;
  case 10:yy.ast.set({ scope: "descendant" })
  break;
  case 11:
  break;
  case 12:yy.ast.set({ scope: "child", operation: "member" })
  break;
  case 13:
  break;
  case 14:yy.ast.set({ expression: { type: "wildcard", value: $$[$0] } })
  break;
  case 15:yy.ast.set({ expression: { type: "identifier", value: $$[$0] } })
  break;
  case 16:yy.ast.set({ expression: { type: "script_expression", value: $$[$0] } })
  break;
  case 17:yy.ast.set({ expression: { type: "numeric_literal", value: parseInt($$[$0]) } })
  break;
  case 18:
  break;
  case 19:yy.ast.set({ scope: "child" })
  break;
  case 20:yy.ast.set({ scope: "descendant" })
  break;
  case 21:
  break;
  case 22:
  break;
  case 23:
  break;
  case 24:$$[$0].length > 1? yy.ast.set({ expression: { type: "union", value: $$[$0] } }) : this.$ = $$[$0]
  break;
  case 25:this.$ = [$$[$0]]
  break;
  case 26:this.$ = $$[$0-2].concat($$[$0])
  break;
  case 27:this.$ = { expression: { type: "numeric_literal", value: parseInt($$[$0]) } }; yy.ast.set(this.$)
  break;
  case 28:this.$ = { expression: { type: "string_literal", value: $$[$0] } }; yy.ast.set(this.$)
  break;
  case 29:this.$ = { expression: { type: "slice", value: $$[$0] } }; yy.ast.set(this.$)
  break;
  case 30:this.$ = { expression: { type: "wildcard", value: $$[$0] } }; yy.ast.set(this.$)
  break;
  case 31:this.$ = { expression: { type: "script_expression", value: $$[$0] } }; yy.ast.set(this.$)
  break;
  case 32:this.$ = { expression: { type: "filter_expression", value: $$[$0] } }; yy.ast.set(this.$)
  break;
  case 33:this.$ = $$[$0]
  break;
  case 34:this.$ = $$[$0]
  break;
  }
  },
  table: [{3:1,4:[1,2],6:3,13:4,15:[1,5],16:[1,6],17:[1,7],18:[1,8],19:[1,9]},{1:[3]},{1:[2,1],5:10,7:11,8:12,9:13,10:14,11:15,12:[1,18],14:[1,19],20:16,21:17,22:[1,20]},{1:[2,3],5:21,7:11,8:12,9:13,10:14,11:15,12:[1,18],14:[1,19],20:16,21:17,22:[1,20]},{1:[2,12],12:[2,12],14:[2,12],22:[2,12]},{1:[2,14],12:[2,14],14:[2,14],22:[2,14]},{1:[2,15],12:[2,15],14:[2,15],22:[2,15]},{1:[2,16],12:[2,16],14:[2,16],22:[2,16]},{1:[2,17],12:[2,17],14:[2,17],22:[2,17]},{1:[2,18],12:[2,18],14:[2,18],22:[2,18]},{1:[2,2],7:22,8:12,9:13,10:14,11:15,12:[1,18],14:[1,19],20:16,21:17,22:[1,20]},{1:[2,5],12:[2,5],14:[2,5],22:[2,5]},{1:[2,7],12:[2,7],14:[2,7],22:[2,7]},{1:[2,8],12:[2,8],14:[2,8],22:[2,8]},{1:[2,9],12:[2,9],14:[2,9],22:[2,9]},{1:[2,10],12:[2,10],14:[2,10],22:[2,10]},{1:[2,19],12:[2,19],14:[2,19],22:[2,19]},{1:[2,20],12:[2,20],14:[2,20],22:[2,20]},{13:23,15:[1,5],16:[1,6],17:[1,7],18:[1,8],19:[1,9]},{13:24,15:[1,5],16:[1,6],17:[1,7],18:[1,8],19:[1,9],22:[1,25]},{15:[1,29],17:[1,30],18:[1,33],23:26,25:27,26:28,27:32,29:34,30:[1,35],31:[1,31],32:[1,36],33:[1,37]},{1:[2,4],7:22,8:12,9:13,10:14,11:15,12:[1,18],14:[1,19],20:16,21:17,22:[1,20]},{1:[2,6],12:[2,6],14:[2,6],22:[2,6]},{1:[2,11],12:[2,11],14:[2,11],22:[2,11]},{1:[2,13],12:[2,13],14:[2,13],22:[2,13]},{15:[1,29],17:[1,30],18:[1,33],23:38,25:27,26:28,27:32,29:34,30:[1,35],31:[1,31],32:[1,36],33:[1,37]},{24:[1,39]},{24:[2,23]},{24:[2,24],28:[1,40]},{24:[2,30]},{24:[2,31]},{24:[2,32]},{24:[2,25],28:[2,25]},{24:[2,27],28:[2,27]},{24:[2,28],28:[2,28]},{24:[2,29],28:[2,29]},{24:[2,33],28:[2,33]},{24:[2,34],28:[2,34]},{24:[1,41]},{1:[2,21],12:[2,21],14:[2,21],22:[2,21]},{18:[1,33],27:42,29:34,30:[1,35],32:[1,36],33:[1,37]},{1:[2,22],12:[2,22],14:[2,22],22:[2,22]},{24:[2,26],28:[2,26]}],
  defaultActions: {27:[2,23],29:[2,30],30:[2,31],31:[2,32]},
  parseError: function parseError(str, hash) {
      if (hash.recoverable) {
          this.trace(str);
      } else {
          throw new Error(str);
      }
  },
  parse: function parse(input) {
      var self = this, stack = [0], vstack = [null], lstack = [], table = this.table, yytext = '', yylineno = 0, yyleng = 0, recovering = 0, TERROR = 2, EOF = 1;
      var args = lstack.slice.call(arguments, 1);
      this.lexer.setInput(input);
      this.lexer.yy = this.yy;
      this.yy.lexer = this.lexer;
      this.yy.parser = this;
      if (typeof this.lexer.yylloc == 'undefined') {
          this.lexer.yylloc = {};
      }
      var yyloc = this.lexer.yylloc;
      lstack.push(yyloc);
      var ranges = this.lexer.options && this.lexer.options.ranges;
      if (typeof this.yy.parseError === 'function') {
          this.parseError = this.yy.parseError;
      } else {
          this.parseError = Object.getPrototypeOf(this).parseError;
      }
      function popStack(n) {
          stack.length = stack.length - 2 * n;
          vstack.length = vstack.length - n;
          lstack.length = lstack.length - n;
      }
      function lex() {
          var token;
          token = self.lexer.lex() || EOF;
          if (typeof token !== 'number') {
              token = self.symbols_[token] || token;
          }
          return token;
      }
      var symbol, preErrorSymbol, state, action, a, r, yyval = {}, p, len, newState, expected;
      while (true) {
          state = stack[stack.length - 1];
          if (this.defaultActions[state]) {
              action = this.defaultActions[state];
          } else {
              if (symbol === null || typeof symbol == 'undefined') {
                  symbol = lex();
              }
              action = table[state] && table[state][symbol];
          }
                      if (typeof action === 'undefined' || !action.length || !action[0]) {
                  var errStr = '';
                  expected = [];
                  for (p in table[state]) {
                      if (this.terminals_[p] && p > TERROR) {
                          expected.push('\'' + this.terminals_[p] + '\'');
                      }
                  }
                  if (this.lexer.showPosition) {
                      errStr = 'Parse error on line ' + (yylineno + 1) + ':\n' + this.lexer.showPosition() + '\nExpecting ' + expected.join(', ') + ', got \'' + (this.terminals_[symbol] || symbol) + '\'';
                  } else {
                      errStr = 'Parse error on line ' + (yylineno + 1) + ': Unexpected ' + (symbol == EOF ? 'end of input' : '\'' + (this.terminals_[symbol] || symbol) + '\'');
                  }
                  this.parseError(errStr, {
                      text: this.lexer.match,
                      token: this.terminals_[symbol] || symbol,
                      line: this.lexer.yylineno,
                      loc: yyloc,
                      expected: expected
                  });
              }
          if (action[0] instanceof Array && action.length > 1) {
              throw new Error('Parse Error: multiple actions possible at state: ' + state + ', token: ' + symbol);
          }
          switch (action[0]) {
          case 1:
              stack.push(symbol);
              vstack.push(this.lexer.yytext);
              lstack.push(this.lexer.yylloc);
              stack.push(action[1]);
              symbol = null;
              if (!preErrorSymbol) {
                  yyleng = this.lexer.yyleng;
                  yytext = this.lexer.yytext;
                  yylineno = this.lexer.yylineno;
                  yyloc = this.lexer.yylloc;
                  if (recovering > 0) {
                      recovering--;
                  }
              } else {
                  symbol = preErrorSymbol;
                  preErrorSymbol = null;
              }
              break;
          case 2:
              len = this.productions_[action[1]][1];
              yyval.$ = vstack[vstack.length - len];
              yyval._$ = {
                  first_line: lstack[lstack.length - (len || 1)].first_line,
                  last_line: lstack[lstack.length - 1].last_line,
                  first_column: lstack[lstack.length - (len || 1)].first_column,
                  last_column: lstack[lstack.length - 1].last_column
              };
              if (ranges) {
                  yyval._$.range = [
                      lstack[lstack.length - (len || 1)].range[0],
                      lstack[lstack.length - 1].range[1]
                  ];
              }
              r = this.performAction.apply(yyval, [
                  yytext,
                  yyleng,
                  yylineno,
                  this.yy,
                  action[1],
                  vstack,
                  lstack
              ].concat(args));
              if (typeof r !== 'undefined') {
                  return r;
              }
              if (len) {
                  stack = stack.slice(0, -1 * len * 2);
                  vstack = vstack.slice(0, -1 * len);
                  lstack = lstack.slice(0, -1 * len);
              }
              stack.push(this.productions_[action[1]][0]);
              vstack.push(yyval.$);
              lstack.push(yyval._$);
              newState = table[stack[stack.length - 2]][stack[stack.length - 1]];
              stack.push(newState);
              break;
          case 3:
              return true;
          }
      }
      return true;
  }};
  var _ast = {
  
    initialize: function() {
      this._nodes = [];
      this._node = {};
      this._stash = [];
    },
  
    set: function(props) {
      for (var k in props) this._node[k] = props[k];
      return this._node;
    },
  
    node: function(obj) {
      if (arguments.length) this._node = obj;
      return this._node;
    },
  
    push: function() {
      this._nodes.push(this._node);
      this._node = {};
    },
  
    unshift: function() {
      this._nodes.unshift(this._node);
      this._node = {};
    },
  
    yield: function() {
      var _nodes = this._nodes;
      this.initialize();
      return _nodes;
    }
  };
  /* generated by jison-lex 0.2.1 */
  var lexer = (function(){
  var lexer = {
  
  EOF:1,
  
  parseError:function parseError(str, hash) {
          if (this.yy.parser) {
              this.yy.parser.parseError(str, hash);
          } else {
              throw new Error(str);
          }
      },
  
  // resets the lexer, sets new input
  setInput:function (input) {
          this._input = input;
          this._more = this._backtrack = this.done = false;
          this.yylineno = this.yyleng = 0;
          this.yytext = this.matched = this.match = '';
          this.conditionStack = ['INITIAL'];
          this.yylloc = {
              first_line: 1,
              first_column: 0,
              last_line: 1,
              last_column: 0
          };
          if (this.options.ranges) {
              this.yylloc.range = [0,0];
          }
          this.offset = 0;
          return this;
      },
  
  // consumes and returns one char from the input
  input:function () {
          var ch = this._input[0];
          this.yytext += ch;
          this.yyleng++;
          this.offset++;
          this.match += ch;
          this.matched += ch;
          var lines = ch.match(/(?:\r\n?|\n).*/g);
          if (lines) {
              this.yylineno++;
              this.yylloc.last_line++;
          } else {
              this.yylloc.last_column++;
          }
          if (this.options.ranges) {
              this.yylloc.range[1]++;
          }
  
          this._input = this._input.slice(1);
          return ch;
      },
  
  // unshifts one char (or a string) into the input
  unput:function (ch) {
          var len = ch.length;
          var lines = ch.split(/(?:\r\n?|\n)/g);
  
          this._input = ch + this._input;
          this.yytext = this.yytext.substr(0, this.yytext.length - len - 1);
          //this.yyleng -= len;
          this.offset -= len;
          var oldLines = this.match.split(/(?:\r\n?|\n)/g);
          this.match = this.match.substr(0, this.match.length - 1);
          this.matched = this.matched.substr(0, this.matched.length - 1);
  
          if (lines.length - 1) {
              this.yylineno -= lines.length - 1;
          }
          var r = this.yylloc.range;
  
          this.yylloc = {
              first_line: this.yylloc.first_line,
              last_line: this.yylineno + 1,
              first_column: this.yylloc.first_column,
              last_column: lines ?
                  (lines.length === oldLines.length ? this.yylloc.first_column : 0)
                   + oldLines[oldLines.length - lines.length].length - lines[0].length :
                this.yylloc.first_column - len
          };
  
          if (this.options.ranges) {
              this.yylloc.range = [r[0], r[0] + this.yyleng - len];
          }
          this.yyleng = this.yytext.length;
          return this;
      },
  
  // When called from action, caches matched text and appends it on next action
  more:function () {
          this._more = true;
          return this;
      },
  
  // When called from action, signals the lexer that this rule fails to match the input, so the next matching rule (regex) should be tested instead.
  reject:function () {
          if (this.options.backtrack_lexer) {
              this._backtrack = true;
          } else {
              return this.parseError('Lexical error on line ' + (this.yylineno + 1) + '. You can only invoke reject() in the lexer when the lexer is of the backtracking persuasion (options.backtrack_lexer = true).\n' + this.showPosition(), {
                  text: "",
                  token: null,
                  line: this.yylineno
              });
  
          }
          return this;
      },
  
  // retain first n characters of the match
  less:function (n) {
          this.unput(this.match.slice(n));
      },
  
  // displays already matched input, i.e. for error messages
  pastInput:function () {
          var past = this.matched.substr(0, this.matched.length - this.match.length);
          return (past.length > 20 ? '...':'') + past.substr(-20).replace(/\n/g, "");
      },
  
  // displays upcoming input, i.e. for error messages
  upcomingInput:function () {
          var next = this.match;
          if (next.length < 20) {
              next += this._input.substr(0, 20-next.length);
          }
          return (next.substr(0,20) + (next.length > 20 ? '...' : '')).replace(/\n/g, "");
      },
  
  // displays the character position where the lexing error occurred, i.e. for error messages
  showPosition:function () {
          var pre = this.pastInput();
          var c = new Array(pre.length + 1).join("-");
          return pre + this.upcomingInput() + "\n" + c + "^";
      },
  
  // test the lexed token: return FALSE when not a match, otherwise return token
  test_match:function (match, indexed_rule) {
          var token,
              lines,
              backup;
  
          if (this.options.backtrack_lexer) {
              // save context
              backup = {
                  yylineno: this.yylineno,
                  yylloc: {
                      first_line: this.yylloc.first_line,
                      last_line: this.last_line,
                      first_column: this.yylloc.first_column,
                      last_column: this.yylloc.last_column
                  },
                  yytext: this.yytext,
                  match: this.match,
                  matches: this.matches,
                  matched: this.matched,
                  yyleng: this.yyleng,
                  offset: this.offset,
                  _more: this._more,
                  _input: this._input,
                  yy: this.yy,
                  conditionStack: this.conditionStack.slice(0),
                  done: this.done
              };
              if (this.options.ranges) {
                  backup.yylloc.range = this.yylloc.range.slice(0);
              }
          }
  
          lines = match[0].match(/(?:\r\n?|\n).*/g);
          if (lines) {
              this.yylineno += lines.length;
          }
          this.yylloc = {
              first_line: this.yylloc.last_line,
              last_line: this.yylineno + 1,
              first_column: this.yylloc.last_column,
              last_column: lines ?
                           lines[lines.length - 1].length - lines[lines.length - 1].match(/\r?\n?/)[0].length :
                           this.yylloc.last_column + match[0].length
          };
          this.yytext += match[0];
          this.match += match[0];
          this.matches = match;
          this.yyleng = this.yytext.length;
          if (this.options.ranges) {
              this.yylloc.range = [this.offset, this.offset += this.yyleng];
          }
          this._more = false;
          this._backtrack = false;
          this._input = this._input.slice(match[0].length);
          this.matched += match[0];
          token = this.performAction.call(this, this.yy, this, indexed_rule, this.conditionStack[this.conditionStack.length - 1]);
          if (this.done && this._input) {
              this.done = false;
          }
          if (token) {
              return token;
          } else if (this._backtrack) {
              // recover context
              for (var k in backup) {
                  this[k] = backup[k];
              }
              return false; // rule action called reject() implying the next rule should be tested instead.
          }
          return false;
      },
  
  // return next match in input
  next:function () {
          if (this.done) {
              return this.EOF;
          }
          if (!this._input) {
              this.done = true;
          }
  
          var token,
              match,
              tempMatch,
              index;
          if (!this._more) {
              this.yytext = '';
              this.match = '';
          }
          var rules = this._currentRules();
          for (var i = 0; i < rules.length; i++) {
              tempMatch = this._input.match(this.rules[rules[i]]);
              if (tempMatch && (!match || tempMatch[0].length > match[0].length)) {
                  match = tempMatch;
                  index = i;
                  if (this.options.backtrack_lexer) {
                      token = this.test_match(tempMatch, rules[i]);
                      if (token !== false) {
                          return token;
                      } else if (this._backtrack) {
                          match = false;
                          continue; // rule action called reject() implying a rule MISmatch.
                      } else {
                          // else: this is a lexer rule which consumes input without producing a token (e.g. whitespace)
                          return false;
                      }
                  } else if (!this.options.flex) {
                      break;
                  }
              }
          }
          if (match) {
              token = this.test_match(match, rules[index]);
              if (token !== false) {
                  return token;
              }
              // else: this is a lexer rule which consumes input without producing a token (e.g. whitespace)
              return false;
          }
          if (this._input === "") {
              return this.EOF;
          } else {
              return this.parseError('Lexical error on line ' + (this.yylineno + 1) + '. Unrecognized text.\n' + this.showPosition(), {
                  text: "",
                  token: null,
                  line: this.yylineno
              });
          }
      },
  
  // return next match that has a token
  lex:function lex() {
          var r = this.next();
          if (r) {
              return r;
          } else {
              return this.lex();
          }
      },
  
  // activates a new lexer condition state (pushes the new lexer condition state onto the condition stack)
  begin:function begin(condition) {
          this.conditionStack.push(condition);
      },
  
  // pop the previously active lexer condition state off the condition stack
  popState:function popState() {
          var n = this.conditionStack.length - 1;
          if (n > 0) {
              return this.conditionStack.pop();
          } else {
              return this.conditionStack[0];
          }
      },
  
  // produce the lexer rule set which is active for the currently active lexer condition state
  _currentRules:function _currentRules() {
          if (this.conditionStack.length && this.conditionStack[this.conditionStack.length - 1]) {
              return this.conditions[this.conditionStack[this.conditionStack.length - 1]].rules;
          } else {
              return this.conditions["INITIAL"].rules;
          }
      },
  
  // return the currently active lexer condition state; when an index argument is provided it produces the N-th previous condition state, if available
  topState:function topState(n) {
          n = this.conditionStack.length - 1 - Math.abs(n || 0);
          if (n >= 0) {
              return this.conditionStack[n];
          } else {
              return "INITIAL";
          }
      },
  
  // alias for begin(condition)
  pushState:function pushState(condition) {
          this.begin(condition);
      },
  
  // return the number of states currently on the stack
  stateStackSize:function stateStackSize() {
          return this.conditionStack.length;
      },
  options: {},
  performAction: function anonymous(yy,yy_,$avoiding_name_collisions,YY_START
  /**/) {
  
  var YYSTATE=YY_START;
  switch($avoiding_name_collisions) {
  case 0:return 4
  break;
  case 1:return 14
  break;
  case 2:return 12
  break;
  case 3:return 15
  break;
  case 4:return 16
  break;
  case 5:return 22
  break;
  case 6:return 24
  break;
  case 7:return 28
  break;
  case 8:return 30
  break;
  case 9:return 18
  break;
  case 10:yy_.yytext = yy_.yytext.substr(1,yy_.yyleng-2); return 32;
  break;
  case 11:yy_.yytext = yy_.yytext.substr(1,yy_.yyleng-2); return 33;
  break;
  case 12:return 17
  break;
  case 13:return 31
  break;
  }
  },
  rules: [/^(?:\$)/,/^(?:\.\.)/,/^(?:\.)/,/^(?:\*)/,/^(?:[a-zA-Z_]+[a-zA-Z0-9_]*)/,/^(?:\[)/,/^(?:\])/,/^(?:,)/,/^(?:((-?(?:0|[1-9][0-9]*)))?\:((-?(?:0|[1-9][0-9]*)))?(\:((-?(?:0|[1-9][0-9]*)))?)?)/,/^(?:(-?(?:0|[1-9][0-9]*)))/,/^(?:"(?:\\["bfnrt/\\]|\\u[a-fA-F0-9]{4}|[^"\\])*")/,/^(?:'(?:\\['bfnrt/\\]|\\u[a-fA-F0-9]{4}|[^'\\])*')/,/^(?:\(.+?\)(?=\]))/,/^(?:\?\(.+?\)(?=\]))/],
  conditions: {"INITIAL":{"rules":[0,1,2,3,4,5,6,7,8,9,10,11,12,13],"inclusive":true}}
  };
  return lexer;
  })();
  parser.lexer = lexer;
  function Parser () {
    this.yy = {};
  }
  Parser.prototype = parser;parser.Parser = Parser;
  return new Parser;
  })();
  
  
  if (typeof require !== 'undefined' && typeof exports !== 'undefined') {
  exports.parser = parser;
  exports.Parser = parser.Parser;
  exports.parse = function () { return parser.parse.apply(parser, arguments); };
  exports.main = function commonjsMain(args) {
      if (!args[1]) {
          console.log('Usage: '+args[0]+' FILE');
          process.exit(1);
      }
      var source = require('fs').readFileSync(require('path').normalize(args[1]), "utf8");
      return exports.parser.parse(source);
  };
  if (typeof module !== 'undefined' && require.main === module) {
    exports.main(process.argv.slice(1));
  }
  }
  
  }).call(this,require('_process'))
  },{"_process":12,"fs":8,"path":11}],2:[function(require,module,exports){
  module.exports = {
    identifier: "[a-zA-Z_]+[a-zA-Z0-9_]*",
    integer: "-?(?:0|[1-9][0-9]*)",
    qq_string: "\"(?:\\\\[\"bfnrt/\\\\]|\\\\u[a-fA-F0-9]{4}|[^\"\\\\])*\"",
    q_string: "'(?:\\\\[\'bfnrt/\\\\]|\\\\u[a-fA-F0-9]{4}|[^\'\\\\])*'"
  };
  
  },{}],3:[function(require,module,exports){
  var dict = require('./dict');
  var fs = require('fs');
  fs.readFileSync = fs.readFileSync || function() {}
  require.resolve = require.resolve || function() {}
  
  var grammar = {
  
      lex: {
  
          macros: {
              esc: "\\\\",
              int: dict.integer
          },
  
          rules: [
              ["\\$", "return 'DOLLAR'"],
              ["\\.\\.", "return 'DOT_DOT'"],
              ["\\.", "return 'DOT'"],
              ["\\*", "return 'STAR'"],
              [dict.identifier, "return 'IDENTIFIER'"],
              ["\\[", "return '['"],
              ["\\]", "return ']'"],
              [",", "return ','"],
              ["({int})?\\:({int})?(\\:({int})?)?", "return 'ARRAY_SLICE'"],
              ["{int}", "return 'INTEGER'"],
              [dict.qq_string, "yytext = yytext.substr(1,yyleng-2); return 'QQ_STRING';"],
              [dict.q_string, "yytext = yytext.substr(1,yyleng-2); return 'Q_STRING';"],
              ["\\(.+?\\)(?=\\])", "return 'SCRIPT_EXPRESSION'"],
              ["\\?\\(.+?\\)(?=\\])", "return 'FILTER_EXPRESSION'"]
          ]
      },
  
      start: "JSON_PATH",
  
      bnf: {
  
          JSON_PATH: [
                  [ 'DOLLAR',                 'yy.ast.set({ expression: { type: "root", value: $1 } }); yy.ast.unshift(); return yy.ast.yield()' ],
                  [ 'DOLLAR PATH_COMPONENTS', 'yy.ast.set({ expression: { type: "root", value: $1 } }); yy.ast.unshift(); return yy.ast.yield()' ],
                  [ 'LEADING_CHILD_MEMBER_EXPRESSION',                 'yy.ast.unshift(); return yy.ast.yield()' ],
                  [ 'LEADING_CHILD_MEMBER_EXPRESSION PATH_COMPONENTS', 'yy.ast.set({ operation: "member", scope: "child", expression: { type: "identifier", value: $1 }}); yy.ast.unshift(); return yy.ast.yield()' ] ],
  
          PATH_COMPONENTS: [
                  [ 'PATH_COMPONENT',                 '' ],
                  [ 'PATH_COMPONENTS PATH_COMPONENT', '' ] ],
  
          PATH_COMPONENT: [
                  [ 'MEMBER_COMPONENT',    'yy.ast.set({ operation: "member" }); yy.ast.push()' ],
                  [ 'SUBSCRIPT_COMPONENT', 'yy.ast.set({ operation: "subscript" }); yy.ast.push() ' ] ],
  
          MEMBER_COMPONENT: [
                  [ 'CHILD_MEMBER_COMPONENT',      'yy.ast.set({ scope: "child" })' ],
                  [ 'DESCENDANT_MEMBER_COMPONENT', 'yy.ast.set({ scope: "descendant" })' ] ],
  
          CHILD_MEMBER_COMPONENT: [
                  [ 'DOT MEMBER_EXPRESSION', '' ] ],
  
          LEADING_CHILD_MEMBER_EXPRESSION: [
                  [ 'MEMBER_EXPRESSION', 'yy.ast.set({ scope: "child", operation: "member" })' ] ],
  
          DESCENDANT_MEMBER_COMPONENT: [
                  [ 'DOT_DOT MEMBER_EXPRESSION', '' ] ],
  
          MEMBER_EXPRESSION: [
                  [ 'STAR',              'yy.ast.set({ expression: { type: "wildcard", value: $1 } })' ],
                  [ 'IDENTIFIER',        'yy.ast.set({ expression: { type: "identifier", value: $1 } })' ],
                  [ 'SCRIPT_EXPRESSION', 'yy.ast.set({ expression: { type: "script_expression", value: $1 } })' ],
                  [ 'INTEGER',           'yy.ast.set({ expression: { type: "numeric_literal", value: parseInt($1) } })' ],
                  [ 'END',               '' ] ],
  
          SUBSCRIPT_COMPONENT: [
                  [ 'CHILD_SUBSCRIPT_COMPONENT',      'yy.ast.set({ scope: "child" })' ],
                  [ 'DESCENDANT_SUBSCRIPT_COMPONENT', 'yy.ast.set({ scope: "descendant" })' ] ],
  
          CHILD_SUBSCRIPT_COMPONENT: [
                  [ '[ SUBSCRIPT ]', '' ] ],
  
          DESCENDANT_SUBSCRIPT_COMPONENT: [
                  [ 'DOT_DOT [ SUBSCRIPT ]', '' ] ],
  
          SUBSCRIPT: [
                  [ 'SUBSCRIPT_EXPRESSION', '' ],
                  [ 'SUBSCRIPT_EXPRESSION_LIST', '$1.length > 1? yy.ast.set({ expression: { type: "union", value: $1 } }) : $$ = $1' ] ],
  
          SUBSCRIPT_EXPRESSION_LIST: [
                  [ 'SUBSCRIPT_EXPRESSION_LISTABLE', '$$ = [$1]'],
                  [ 'SUBSCRIPT_EXPRESSION_LIST , SUBSCRIPT_EXPRESSION_LISTABLE', '$$ = $1.concat($3)' ] ],
  
          SUBSCRIPT_EXPRESSION_LISTABLE: [
                  [ 'INTEGER',           '$$ = { expression: { type: "numeric_literal", value: parseInt($1) } }; yy.ast.set($$)' ],
                  [ 'STRING_LITERAL',    '$$ = { expression: { type: "string_literal", value: $1 } }; yy.ast.set($$)' ],
                  [ 'ARRAY_SLICE',       '$$ = { expression: { type: "slice", value: $1 } }; yy.ast.set($$)' ] ],
  
          SUBSCRIPT_EXPRESSION: [
                  [ 'STAR',              '$$ = { expression: { type: "wildcard", value: $1 } }; yy.ast.set($$)' ],
                  [ 'SCRIPT_EXPRESSION', '$$ = { expression: { type: "script_expression", value: $1 } }; yy.ast.set($$)' ],
                  [ 'FILTER_EXPRESSION', '$$ = { expression: { type: "filter_expression", value: $1 } }; yy.ast.set($$)' ] ],
  
          STRING_LITERAL: [
                  [ 'QQ_STRING', "$$ = $1" ],
                  [ 'Q_STRING',  "$$ = $1" ] ]
      },
  
      moduleInclude: fs.readFileSync(require.resolve("../include/module.js")),
      actionInclude: fs.readFileSync(require.resolve("../include/action.js"))
  };
  
  module.exports = grammar;
  
  },{"./dict":2,"fs":8}],4:[function(require,module,exports){
  var aesprim = require('./aesprim');
  var slice = require('./slice');
  var _evaluate = require('static-eval');
  var _uniq = require('underscore').uniq;
  
  var Handlers = function() {
    return this.initialize.apply(this, arguments);
  }
  
  Handlers.prototype.initialize = function() {
    this.traverse = traverser(true);
    this.descend = traverser();
  }
  
  Handlers.prototype.keys = Object.keys;
  
  Handlers.prototype.resolve = function(component) {
  
    var key = [ component.operation, component.scope, component.expression.type ].join('-');
    var method = this._fns[key];
  
    if (!method) throw new Error("couldn't resolve key: " + key);
    return method.bind(this);
  };
  
  Handlers.prototype.register = function(key, handler) {
  
    if (!handler instanceof Function) {
      throw new Error("handler must be a function");
    }
  
    this._fns[key] = handler;
  };
  
  Handlers.prototype._fns = {
  
    'member-child-identifier': function(component, partial) {
      var key = component.expression.value;
      var value = partial.value;
      if (value instanceof Object && key in value) {
        return [ { value: value[key], path: partial.path.concat(key) } ]
      }
    },
  
    'member-descendant-identifier':
      _traverse(function(key, value, ref) { return key == ref }),
  
    'subscript-child-numeric_literal':
      _descend(function(key, value, ref) { return key === ref }),
  
    'subscript-descendant-numeric_literal':
      _traverse(function(key, value, ref) { return key === ref }),
  
    'member-child-wildcard':
      _descend(function() { return true }),
  
    'member-descendant-wildcard':
      _traverse(function() { return true }),
  
    'subscript-descendant-wildcard':
      _traverse(function() { return true }),
  
    'subscript-child-wildcard':
      _descend(function() { return true }),
  
    'subscript-child-slice': function(component, partial) {
      if (is_array(partial.value)) {
        var args = component.expression.value.split(':');
        var values = partial.value.map(function(v, i) { return { value: v, path: partial.path.concat(i) } });
        return slice.apply(null, [values].concat(args));
      }
    },
  
    'subscript-child-union': function(component, partial) {
      var results = [];
      component.expression.value.forEach(function(component) {
        var _component = { operation: 'subscript', scope: 'child', expression: component.expression };
        var handler = this.resolve(_component);
        var _results = handler(_component, partial);
        results = results.concat(_results);
      }, this);
  
      return unique(results);
    },
  
    'subscript-descendant-union': function(component, partial, count) {
  
      var jp = require('..');
      var self = this;
  
      var results = [];
      var nodes = jp.nodes(partial, '$..*').slice(1);
  
      nodes.forEach(function(node) {
        if (results.length >= count) return;
        component.expression.value.forEach(function(component) {
          var _component = { operation: 'subscript', scope: 'child', expression: component.expression };
          var handler = self.resolve(_component);
          var _results = handler(_component, node);
          results = results.concat(_results);
        });
      });
  
      return unique(results);
    },
  
    'subscript-child-filter_expression': function(component, partial, count) {
  
      // slice out the expression from ?(expression)
      var src = component.expression.value.slice(2, -1);
      var ast = aesprim.parse(src).body[0].expression;
  
      var passable = function(key, value) {
        return evaluate(ast, { '@': value });
      }
  
      return this.descend(partial, null, passable, count);
  
    },
  
    'subscript-descendant-filter_expression': function(component, partial, count) {
  
      // slice out the expression from ?(expression)
      var src = component.expression.value.slice(2, -1);
      var ast = aesprim.parse(src).body[0].expression;
  
      var passable = function(key, value) {
        return evaluate(ast, { '@': value });
      }
  
      return this.traverse(partial, null, passable, count);
    },
  
    'subscript-child-script_expression': function(component, partial) {
      var exp = component.expression.value.slice(1, -1);
      return eval_recurse(partial, exp, '$[{{value}}]');
    },
  
    'member-child-script_expression': function(component, partial) {
      var exp = component.expression.value.slice(1, -1);
      return eval_recurse(partial, exp, '$.{{value}}');
    },
  
    'member-descendant-script_expression': function(component, partial) {
      var exp = component.expression.value.slice(1, -1);
      return eval_recurse(partial, exp, '$..value');
    }
  };
  
  Handlers.prototype._fns['subscript-child-string_literal'] =
  	Handlers.prototype._fns['member-child-identifier'];
  
  Handlers.prototype._fns['member-child-numeric_literal'] =
  	Handlers.prototype._fns['subscript-child-numeric_literal'];
  
  Handlers.prototype._fns['member-descendant-numeric_literal'] =
      Handlers.prototype._fns['subscript-descendant-string_literal'] =
      Handlers.prototype._fns['member-descendant-identifier'];
  
  function eval_recurse(partial, src, template) {
  
    var jp = require('./index');
    var ast = aesprim.parse(src).body[0].expression;
    var value = evaluate(ast, { '@': partial.value });
    var path = template.replace(/\{\{\s*value\s*\}\}/g, value);
  
    var results = jp.nodes(partial.value, path);
    results.forEach(function(r) {
      r.path = partial.path.concat(r.path.slice(1));
    });
  
    return results;
  }
  
  function is_array(val) {
    return Array.isArray(val);
  }
  
  function is_object(val) {
    // is this a non-array, non-null object?
    return val && !(val instanceof Array) && val instanceof Object;
  }
  
  function traverser(recurse) {
  
    return function(partial, ref, passable, count) {
  
      var value = partial.value;
      var path = partial.path;
  
      var results = [];
  
      var descend = function(value, path) {
  
        if (is_array(value)) {
          value.forEach(function(element, index) {
            if (results.length >= count) { return }
            if (passable(index, element, ref)) {
              results.push({ path: path.concat(index), value: element });
            }
          });
          value.forEach(function(element, index) {
            if (results.length >= count) { return }
            if (recurse) {
              descend(element, path.concat(index));
            }
          });
        } else if (is_object(value)) {
          this.keys(value).forEach(function(k) {
            if (results.length >= count) { return }
            if (passable(k, value[k], ref)) {
              results.push({ path: path.concat(k), value: value[k] });
            }
          })
          this.keys(value).forEach(function(k) {
            if (results.length >= count) { return }
            if (recurse) {
              descend(value[k], path.concat(k));
            }
          });
        }
      }.bind(this);
      descend(value, path);
      return results;
    }
  }
  
  function _descend(passable) {
    return function(component, partial, count) {
      return this.descend(partial, component.expression.value, passable, count);
    }
  }
  
  function _traverse(passable) {
    return function(component, partial, count) {
      return this.traverse(partial, component.expression.value, passable, count);
    }
  }
  
  function evaluate() {
    try { return _evaluate.apply(this, arguments) }
    catch (e) { }
  }
  
  function unique(results) {
    return _uniq(
      results,
      function(r) { return r.path.map(function(c) { return String(c).replace('-', '--') }).join('-') }
    );
  }
  
  module.exports = Handlers;
  
  },{"..":"jsonpath","./aesprim":"./aesprim","./index":5,"./slice":7,"static-eval":15,"underscore":8}],5:[function(require,module,exports){
  /* global toString */
  
  var assert = require('assert');
  var dict = require('./dict');
  var Parser = require('./parser');
  var Handlers = require('./handlers');
  
  var JSONPath = function() {
    this.initialize.apply(this, arguments);
  };
  
  JSONPath.prototype.initialize = function() {
    this.parser = new Parser();
    this.handlers = new Handlers();
  };
  
  JSONPath.prototype.parse = function(string) {
    assert.ok(_is_string(string), "we need a path");
    return this.parser.parse(string);
  };
  
  JSONPath.prototype.parent = function(obj, string) {
  
    assert.ok(obj instanceof Object, "obj needs to be an object");
    assert.ok(string, "we need a path");
  
    var node = this.nodes(obj, string)[0];
    var key = node.path.pop(); /* jshint unused:false */
    return this.value(obj, node.path);
  }
  
  JSONPath.prototype.apply = function(obj, string, fn) {
  
    assert.ok(obj instanceof Object, "obj needs to be an object");
    assert.ok(string, "we need a path");
    assert.equal(typeof fn, "function", "fn needs to be function")
  
    var nodes = this.nodes(obj, string);
  
    nodes.forEach(function(node) {
      var key = node.path.pop();
      var parent = this.value(obj, this.stringify(node.path));
      var val = node.value = fn.call(obj, parent[key]);
      parent[key] = val;
    }, this);
  
    return nodes;
  }
  
  JSONPath.prototype.value = function(obj, path, value) {
  
    assert.ok(obj instanceof Object, "obj needs to be an object");
    assert.ok(path, "we need a path");
  
    if (arguments.length >= 3) {
      var node = this.nodes(obj, path).shift();
      if (!node) return this._vivify(obj, path, value);
      var key = node.path.slice(-1).shift();
      var parent = this.parent(obj, this.stringify(node.path));
      parent[key] = value;
    }
    return this.query(obj, this.stringify(path), 1).shift();
  }
  
  JSONPath.prototype._vivify = function(obj, string, value) {
  
    var self = this;
  
    assert.ok(obj instanceof Object, "obj needs to be an object");
    assert.ok(string, "we need a path");
  
    var path = this.parser.parse(string)
      .map(function(component) { return component.expression.value });
  
    var setValue = function(path, value) {
      var key = path.pop();
      var node = self.value(obj, path);
      if (!node) {
        setValue(path.concat(), typeof key === 'string' ? {} : []);
        node = self.value(obj, path);
      }
      node[key] = value;
    }
    setValue(path, value);
    return this.query(obj, string)[0];
  }
  
  JSONPath.prototype.query = function(obj, string, count) {
  
    assert.ok(obj instanceof Object, "obj needs to be an object");
    assert.ok(_is_string(string), "we need a path");
  
    var results = this.nodes(obj, string, count)
      .map(function(r) { return r.value });
  
    return results;
  };
  
  JSONPath.prototype.paths = function(obj, string, count) {
  
    assert.ok(obj instanceof Object, "obj needs to be an object");
    assert.ok(string, "we need a path");
  
    var results = this.nodes(obj, string, count)
      .map(function(r) { return r.path });
  
    return results;
  };
  
  JSONPath.prototype.nodes = function(obj, string, count) {
  
    assert.ok(obj instanceof Object, "obj needs to be an object");
    assert.ok(string, "we need a path");
  
    if (count === 0) return [];
  
    var path = this.parser.parse(string);
    var handlers = this.handlers;
  
    var partials = [ { path: ['$'], value: obj } ];
    var matches = [];
  
    if (path.length && path[0].expression.type == 'root') path.shift();
  
    if (!path.length) return partials;
  
    path.forEach(function(component, index) {
  
      if (matches.length >= count) return;
      var handler = handlers.resolve(component);
      var _partials = [];
  
      partials.forEach(function(p) {
  
        if (matches.length >= count) return;
        var results = handler(component, p, count);
  
        if (index == path.length - 1) {
          // if we're through the components we're done
          matches = matches.concat(results || []);
        } else {
          // otherwise accumulate and carry on through
          _partials = _partials.concat(results || []);
        }
      });
  
      partials = _partials;
  
    });
  
    return count ? matches.slice(0, count) : matches;
  };
  
  JSONPath.prototype.stringify = function(path) {
  
    assert.ok(path, "we need a path");
  
    var string = '$';
  
    var templates = {
      'descendant-member': '..{{value}}',
      'child-member': '.{{value}}',
      'descendant-subscript': '..[{{value}}]',
      'child-subscript': '[{{value}}]'
    };
  
    path = this._normalize(path);
  
    path.forEach(function(component) {
  
      if (component.expression.type == 'root') return;
  
      var key = [component.scope, component.operation].join('-');
      var template = templates[key];
      var value;
  
      if (component.expression.type == 'string_literal') {
        value = JSON.stringify(component.expression.value)
      } else {
        value = component.expression.value;
      }
  
      if (!template) throw new Error("couldn't find template " + key);
  
      string += template.replace(/{{value}}/, value);
    });
  
    return string;
  }
  
  JSONPath.prototype._normalize = function(path) {
  
    assert.ok(path, "we need a path");
  
    if (typeof path == "string") {
  
      return this.parser.parse(path);
  
    } else if (Array.isArray(path) && typeof path[0] == "string") {
  
      var _path = [ { expression: { type: "root", value: "$" } } ];
  
      path.forEach(function(component, index) {
  
        if (component == '$' && index === 0) return;
  
        if (typeof component == "string" && component.match("^" + dict.identifier + "$")) {
  
          _path.push({
            operation: 'member',
            scope: 'child',
            expression: { value: component, type: 'identifier' }
          });
  
        } else {
  
          var type = typeof component == "number" ?
            'numeric_literal' : 'string_literal';
  
          _path.push({
            operation: 'subscript',
            scope: 'child',
            expression: { value: component, type: type }
          });
        }
      });
  
      return _path;
  
    } else if (Array.isArray(path) && typeof path[0] == "object") {
  
      return path
    }
  
    throw new Error("couldn't understand path " + path);
  }
  
  function _is_string(obj) {
    return toString.call(obj) == '[object String]';
  }
  
  JSONPath.Handlers = Handlers;
  JSONPath.Parser = Parser;
  
  var instance = new JSONPath;
  instance.JSONPath = JSONPath;
  
  module.exports = instance;
  
  },{"./dict":2,"./handlers":4,"./parser":6,"assert":9}],6:[function(require,module,exports){
  var grammar = require('./grammar');
  var gparser = require('../generated/parser');
  
  var Parser = function() {
  
    var parser = new gparser.Parser();
  
    var _parseError = parser.parseError;
    parser.yy.parseError = function() {
      if (parser.yy.ast) {
        parser.yy.ast.initialize();
      }
      _parseError.apply(parser, arguments);
    }
  
    return parser;
  
  };
  
  Parser.grammar = grammar;
  module.exports = Parser;
  
  },{"../generated/parser":1,"./grammar":3}],7:[function(require,module,exports){
  module.exports = function(arr, start, end, step) {
  
    var len = arr.length;
  
    if (step === 0) throw new Error("step cannot be zero");
    step = step ? integer(step) : 1;
  
    // normalize negative values
    start = start < 0 ? len + start : start;
    end = end < 0 ? len + end : end;
  
    // default extents to extents
    start = integer(start === 0 ? 0 : !start ? (step > 0 ? 0 : len - 1) : start);
    end = integer(end === 0 ? 0 : !end ? (step > 0 ? len : -1) : end);
  
    // clamp extents
    start = step > 0 ? Math.max(0, start) : Math.min(len, start);
    end = step > 0 ? Math.min(end, len) : Math.max(-1, end);
  
    // return empty if extents are backwards
    if (step > 0 && end <= start) return [];
    if (step < 0 && start <= end) return [];
  
    var result = [];
  
    for (var i = start; i != end; i += step) {
      if ((step < 0 && i <= end) || (step > 0 && i >= end)) break;
      result.push(arr[i]);
    }
  
    return result;
  }
  
  function integer(val) {
    return String(val).match(/^[0-9]+$/) ? parseInt(val) :
      Number.isFinite(val) ? parseInt(val, 10) : 0;
  }
  
  },{}],8:[function(require,module,exports){
  
  },{}],9:[function(require,module,exports){
  // http://wiki.commonjs.org/wiki/Unit_Testing/1.0
  //
  // THIS IS NOT TESTED NOR LIKELY TO WORK OUTSIDE V8!
  //
  // Originally from narwhal.js (http://narwhaljs.org)
  // Copyright (c) 2009 Thomas Robinson <280north.com>
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the 'Software'), to
  // deal in the Software without restriction, including without limitation the
  // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  // sell copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  // AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  // when used in node, this will actually load the util module we depend on
  // versus loading the builtin util module as happens otherwise
  // this is a bug in node module loading as far as I am concerned
  var util = require('util/');
  
  var pSlice = Array.prototype.slice;
  var hasOwn = Object.prototype.hasOwnProperty;
  
  // 1. The assert module provides functions that throw
  // AssertionError's when particular conditions are not met. The
  // assert module must conform to the following interface.
  
  var assert = module.exports = ok;
  
  // 2. The AssertionError is defined in assert.
  // new assert.AssertionError({ message: message,
  //                             actual: actual,
  //                             expected: expected })
  
  assert.AssertionError = function AssertionError(options) {
    this.name = 'AssertionError';
    this.actual = options.actual;
    this.expected = options.expected;
    this.operator = options.operator;
    if (options.message) {
      this.message = options.message;
      this.generatedMessage = false;
    } else {
      this.message = getMessage(this);
      this.generatedMessage = true;
    }
    var stackStartFunction = options.stackStartFunction || fail;
  
    if (Error.captureStackTrace) {
      Error.captureStackTrace(this, stackStartFunction);
    }
    else {
      // non v8 browsers so we can have a stacktrace
      var err = new Error();
      if (err.stack) {
        var out = err.stack;
  
        // try to strip useless frames
        var fn_name = stackStartFunction.name;
        var idx = out.indexOf('\n' + fn_name);
        if (idx >= 0) {
          // once we have located the function frame
          // we need to strip out everything before it (and its line)
          var next_line = out.indexOf('\n', idx + 1);
          out = out.substring(next_line + 1);
        }
  
        this.stack = out;
      }
    }
  };
  
  // assert.AssertionError instanceof Error
  util.inherits(assert.AssertionError, Error);
  
  function replacer(key, value) {
    if (util.isUndefined(value)) {
      return '' + value;
    }
    if (util.isNumber(value) && !isFinite(value)) {
      return value.toString();
    }
    if (util.isFunction(value) || util.isRegExp(value)) {
      return value.toString();
    }
    return value;
  }
  
  function truncate(s, n) {
    if (util.isString(s)) {
      return s.length < n ? s : s.slice(0, n);
    } else {
      return s;
    }
  }
  
  function getMessage(self) {
    return truncate(JSON.stringify(self.actual, replacer), 128) + ' ' +
           self.operator + ' ' +
           truncate(JSON.stringify(self.expected, replacer), 128);
  }
  
  // At present only the three keys mentioned above are used and
  // understood by the spec. Implementations or sub modules can pass
  // other keys to the AssertionError's constructor - they will be
  // ignored.
  
  // 3. All of the following functions must throw an AssertionError
  // when a corresponding condition is not met, with a message that
  // may be undefined if not provided.  All assertion methods provide
  // both the actual and expected values to the assertion error for
  // display purposes.
  
  function fail(actual, expected, message, operator, stackStartFunction) {
    throw new assert.AssertionError({
      message: message,
      actual: actual,
      expected: expected,
      operator: operator,
      stackStartFunction: stackStartFunction
    });
  }
  
  // EXTENSION! allows for well behaved errors defined elsewhere.
  assert.fail = fail;
  
  // 4. Pure assertion tests whether a value is truthy, as determined
  // by !!guard.
  // assert.ok(guard, message_opt);
  // This statement is equivalent to assert.equal(true, !!guard,
  // message_opt);. To test strictly for the value true, use
  // assert.strictEqual(true, guard, message_opt);.
  
  function ok(value, message) {
    if (!value) fail(value, true, message, '==', assert.ok);
  }
  assert.ok = ok;
  
  // 5. The equality assertion tests shallow, coercive equality with
  // ==.
  // assert.equal(actual, expected, message_opt);
  
  assert.equal = function equal(actual, expected, message) {
    if (actual != expected) fail(actual, expected, message, '==', assert.equal);
  };
  
  // 6. The non-equality assertion tests for whether two objects are not equal
  // with != assert.notEqual(actual, expected, message_opt);
  
  assert.notEqual = function notEqual(actual, expected, message) {
    if (actual == expected) {
      fail(actual, expected, message, '!=', assert.notEqual);
    }
  };
  
  // 7. The equivalence assertion tests a deep equality relation.
  // assert.deepEqual(actual, expected, message_opt);
  
  assert.deepEqual = function deepEqual(actual, expected, message) {
    if (!_deepEqual(actual, expected)) {
      fail(actual, expected, message, 'deepEqual', assert.deepEqual);
    }
  };
  
  function _deepEqual(actual, expected) {
    // 7.1. All identical values are equivalent, as determined by ===.
    if (actual === expected) {
      return true;
  
    } else if (util.isBuffer(actual) && util.isBuffer(expected)) {
      if (actual.length != expected.length) return false;
  
      for (var i = 0; i < actual.length; i++) {
        if (actual[i] !== expected[i]) return false;
      }
  
      return true;
  
    // 7.2. If the expected value is a Date object, the actual value is
    // equivalent if it is also a Date object that refers to the same time.
    } else if (util.isDate(actual) && util.isDate(expected)) {
      return actual.getTime() === expected.getTime();
  
    // 7.3 If the expected value is a RegExp object, the actual value is
    // equivalent if it is also a RegExp object with the same source and
    // properties (`global`, `multiline`, `lastIndex`, `ignoreCase`).
    } else if (util.isRegExp(actual) && util.isRegExp(expected)) {
      return actual.source === expected.source &&
             actual.global === expected.global &&
             actual.multiline === expected.multiline &&
             actual.lastIndex === expected.lastIndex &&
             actual.ignoreCase === expected.ignoreCase;
  
    // 7.4. Other pairs that do not both pass typeof value == 'object',
    // equivalence is determined by ==.
    } else if (!util.isObject(actual) && !util.isObject(expected)) {
      return actual == expected;
  
    // 7.5 For all other Object pairs, including Array objects, equivalence is
    // determined by having the same number of owned properties (as verified
    // with Object.prototype.hasOwnProperty.call), the same set of keys
    // (although not necessarily the same order), equivalent values for every
    // corresponding key, and an identical 'prototype' property. Note: this
    // accounts for both named and indexed properties on Arrays.
    } else {
      return objEquiv(actual, expected);
    }
  }
  
  function isArguments(object) {
    return Object.prototype.toString.call(object) == '[object Arguments]';
  }
  
  function objEquiv(a, b) {
    if (util.isNullOrUndefined(a) || util.isNullOrUndefined(b))
      return false;
    // an identical 'prototype' property.
    if (a.prototype !== b.prototype) return false;
    // if one is a primitive, the other must be same
    if (util.isPrimitive(a) || util.isPrimitive(b)) {
      return a === b;
    }
    var aIsArgs = isArguments(a),
        bIsArgs = isArguments(b);
    if ((aIsArgs && !bIsArgs) || (!aIsArgs && bIsArgs))
      return false;
    if (aIsArgs) {
      a = pSlice.call(a);
      b = pSlice.call(b);
      return _deepEqual(a, b);
    }
    var ka = objectKeys(a),
        kb = objectKeys(b),
        key, i;
    // having the same number of owned properties (keys incorporates
    // hasOwnProperty)
    if (ka.length != kb.length)
      return false;
    //the same set of keys (although not necessarily the same order),
    ka.sort();
    kb.sort();
    //~~~cheap key test
    for (i = ka.length - 1; i >= 0; i--) {
      if (ka[i] != kb[i])
        return false;
    }
    //equivalent values for every corresponding key, and
    //~~~possibly expensive deep test
    for (i = ka.length - 1; i >= 0; i--) {
      key = ka[i];
      if (!_deepEqual(a[key], b[key])) return false;
    }
    return true;
  }
  
  // 8. The non-equivalence assertion tests for any deep inequality.
  // assert.notDeepEqual(actual, expected, message_opt);
  
  assert.notDeepEqual = function notDeepEqual(actual, expected, message) {
    if (_deepEqual(actual, expected)) {
      fail(actual, expected, message, 'notDeepEqual', assert.notDeepEqual);
    }
  };
  
  // 9. The strict equality assertion tests strict equality, as determined by ===.
  // assert.strictEqual(actual, expected, message_opt);
  
  assert.strictEqual = function strictEqual(actual, expected, message) {
    if (actual !== expected) {
      fail(actual, expected, message, '===', assert.strictEqual);
    }
  };
  
  // 10. The strict non-equality assertion tests for strict inequality, as
  // determined by !==.  assert.notStrictEqual(actual, expected, message_opt);
  
  assert.notStrictEqual = function notStrictEqual(actual, expected, message) {
    if (actual === expected) {
      fail(actual, expected, message, '!==', assert.notStrictEqual);
    }
  };
  
  function expectedException(actual, expected) {
    if (!actual || !expected) {
      return false;
    }
  
    if (Object.prototype.toString.call(expected) == '[object RegExp]') {
      return expected.test(actual);
    } else if (actual instanceof expected) {
      return true;
    } else if (expected.call({}, actual) === true) {
      return true;
    }
  
    return false;
  }
  
  function _throws(shouldThrow, block, expected, message) {
    var actual;
  
    if (util.isString(expected)) {
      message = expected;
      expected = null;
    }
  
    try {
      block();
    } catch (e) {
      actual = e;
    }
  
    message = (expected && expected.name ? ' (' + expected.name + ').' : '.') +
              (message ? ' ' + message : '.');
  
    if (shouldThrow && !actual) {
      fail(actual, expected, 'Missing expected exception' + message);
    }
  
    if (!shouldThrow && expectedException(actual, expected)) {
      fail(actual, expected, 'Got unwanted exception' + message);
    }
  
    if ((shouldThrow && actual && expected &&
        !expectedException(actual, expected)) || (!shouldThrow && actual)) {
      throw actual;
    }
  }
  
  // 11. Expected to throw an error:
  // assert.throws(block, Error_opt, message_opt);
  
  assert.throws = function(block, /*optional*/error, /*optional*/message) {
    _throws.apply(this, [true].concat(pSlice.call(arguments)));
  };
  
  // EXTENSION! This is annoying to write outside this module.
  assert.doesNotThrow = function(block, /*optional*/message) {
    _throws.apply(this, [false].concat(pSlice.call(arguments)));
  };
  
  assert.ifError = function(err) { if (err) {throw err;}};
  
  var objectKeys = Object.keys || function (obj) {
    var keys = [];
    for (var key in obj) {
      if (hasOwn.call(obj, key)) keys.push(key);
    }
    return keys;
  };
  
  },{"util/":14}],10:[function(require,module,exports){
  if (typeof Object.create === 'function') {
    // implementation from standard node.js 'util' module
    module.exports = function inherits(ctor, superCtor) {
      ctor.super_ = superCtor
      ctor.prototype = Object.create(superCtor.prototype, {
        constructor: {
          value: ctor,
          enumerable: false,
          writable: true,
          configurable: true
        }
      });
    };
  } else {
    // old school shim for old browsers
    module.exports = function inherits(ctor, superCtor) {
      ctor.super_ = superCtor
      var TempCtor = function () {}
      TempCtor.prototype = superCtor.prototype
      ctor.prototype = new TempCtor()
      ctor.prototype.constructor = ctor
    }
  }
  
  },{}],11:[function(require,module,exports){
  (function (process){
  // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  // resolves . and .. elements in a path array with directory names there
  // must be no slashes, empty elements, or device names (c:\) in the array
  // (so also no leading and trailing slashes - it does not distinguish
  // relative and absolute paths)
  function normalizeArray(parts, allowAboveRoot) {
    // if the path tries to go above the root, `up` ends up > 0
    var up = 0;
    for (var i = parts.length - 1; i >= 0; i--) {
      var last = parts[i];
      if (last === '.') {
        parts.splice(i, 1);
      } else if (last === '..') {
        parts.splice(i, 1);
        up++;
      } else if (up) {
        parts.splice(i, 1);
        up--;
      }
    }
  
    // if the path is allowed to go above the root, restore leading ..s
    if (allowAboveRoot) {
      for (; up--; up) {
        parts.unshift('..');
      }
    }
  
    return parts;
  }
  
  // Split a filename into [root, dir, basename, ext], unix version
  // 'root' is just a slash, or nothing.
  var splitPathRe =
      /^(\/?|)([\s\S]*?)((?:\.{1,2}|[^\/]+?|)(\.[^.\/]*|))(?:[\/]*)$/;
  var splitPath = function(filename) {
    return splitPathRe.exec(filename).slice(1);
  };
  
  // path.resolve([from ...], to)
  // posix version
  exports.resolve = function() {
    var resolvedPath = '',
        resolvedAbsolute = false;
  
    for (var i = arguments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
      var path = (i >= 0) ? arguments[i] : process.cwd();
  
      // Skip empty and invalid entries
      if (typeof path !== 'string') {
        throw new TypeError('Arguments to path.resolve must be strings');
      } else if (!path) {
        continue;
      }
  
      resolvedPath = path + '/' + resolvedPath;
      resolvedAbsolute = path.charAt(0) === '/';
    }
  
    // At this point the path should be resolved to a full absolute path, but
    // handle relative paths to be safe (might happen when process.cwd() fails)
  
    // Normalize the path
    resolvedPath = normalizeArray(filter(resolvedPath.split('/'), function(p) {
      return !!p;
    }), !resolvedAbsolute).join('/');
  
    return ((resolvedAbsolute ? '/' : '') + resolvedPath) || '.';
  };
  
  // path.normalize(path)
  // posix version
  exports.normalize = function(path) {
    var isAbsolute = exports.isAbsolute(path),
        trailingSlash = substr(path, -1) === '/';
  
    // Normalize the path
    path = normalizeArray(filter(path.split('/'), function(p) {
      return !!p;
    }), !isAbsolute).join('/');
  
    if (!path && !isAbsolute) {
      path = '.';
    }
    if (path && trailingSlash) {
      path += '/';
    }
  
    return (isAbsolute ? '/' : '') + path;
  };
  
  // posix version
  exports.isAbsolute = function(path) {
    return path.charAt(0) === '/';
  };
  
  // posix version
  exports.join = function() {
    var paths = Array.prototype.slice.call(arguments, 0);
    return exports.normalize(filter(paths, function(p, index) {
      if (typeof p !== 'string') {
        throw new TypeError('Arguments to path.join must be strings');
      }
      return p;
    }).join('/'));
  };
  
  
  // path.relative(from, to)
  // posix version
  exports.relative = function(from, to) {
    from = exports.resolve(from).substr(1);
    to = exports.resolve(to).substr(1);
  
    function trim(arr) {
      var start = 0;
      for (; start < arr.length; start++) {
        if (arr[start] !== '') break;
      }
  
      var end = arr.length - 1;
      for (; end >= 0; end--) {
        if (arr[end] !== '') break;
      }
  
      if (start > end) return [];
      return arr.slice(start, end - start + 1);
    }
  
    var fromParts = trim(from.split('/'));
    var toParts = trim(to.split('/'));
  
    var length = Math.min(fromParts.length, toParts.length);
    var samePartsLength = length;
    for (var i = 0; i < length; i++) {
      if (fromParts[i] !== toParts[i]) {
        samePartsLength = i;
        break;
      }
    }
  
    var outputParts = [];
    for (var i = samePartsLength; i < fromParts.length; i++) {
      outputParts.push('..');
    }
  
    outputParts = outputParts.concat(toParts.slice(samePartsLength));
  
    return outputParts.join('/');
  };
  
  exports.sep = '/';
  exports.delimiter = ':';
  
  exports.dirname = function(path) {
    var result = splitPath(path),
        root = result[0],
        dir = result[1];
  
    if (!root && !dir) {
      // No dirname whatsoever
      return '.';
    }
  
    if (dir) {
      // It has a dirname, strip trailing slash
      dir = dir.substr(0, dir.length - 1);
    }
  
    return root + dir;
  };
  
  
  exports.basename = function(path, ext) {
    var f = splitPath(path)[2];
    // TODO: make this comparison case-insensitive on windows?
    if (ext && f.substr(-1 * ext.length) === ext) {
      f = f.substr(0, f.length - ext.length);
    }
    return f;
  };
  
  
  exports.extname = function(path) {
    return splitPath(path)[3];
  };
  
  function filter (xs, f) {
      if (xs.filter) return xs.filter(f);
      var res = [];
      for (var i = 0; i < xs.length; i++) {
          if (f(xs[i], i, xs)) res.push(xs[i]);
      }
      return res;
  }
  
  // String.prototype.substr - negative index don't work in IE8
  var substr = 'ab'.substr(-1) === 'b'
      ? function (str, start, len) { return str.substr(start, len) }
      : function (str, start, len) {
          if (start < 0) start = str.length + start;
          return str.substr(start, len);
      }
  ;
  
  }).call(this,require('_process'))
  },{"_process":12}],12:[function(require,module,exports){
  // shim for using process in browser
  
  var process = module.exports = {};
  var queue = [];
  var draining = false;
  var currentQueue;
  var queueIndex = -1;
  
  function cleanUpNextTick() {
      if (!draining || !currentQueue) {
          return;
      }
      draining = false;
      if (currentQueue.length) {
          queue = currentQueue.concat(queue);
      } else {
          queueIndex = -1;
      }
      if (queue.length) {
          drainQueue();
      }
  }
  
  function drainQueue() {
      if (draining) {
          return;
      }
      var timeout = setTimeout(cleanUpNextTick);
      draining = true;
  
      var len = queue.length;
      while(len) {
          currentQueue = queue;
          queue = [];
          while (++queueIndex < len) {
              if (currentQueue) {
                  currentQueue[queueIndex].run();
              }
          }
          queueIndex = -1;
          len = queue.length;
      }
      currentQueue = null;
      draining = false;
      clearTimeout(timeout);
  }
  
  process.nextTick = function (fun) {
      var args = new Array(arguments.length - 1);
      if (arguments.length > 1) {
          for (var i = 1; i < arguments.length; i++) {
              args[i - 1] = arguments[i];
          }
      }
      queue.push(new Item(fun, args));
      if (queue.length === 1 && !draining) {
          setTimeout(drainQueue, 0);
      }
  };
  
  // v8 likes predictible objects
  function Item(fun, array) {
      this.fun = fun;
      this.array = array;
  }
  Item.prototype.run = function () {
      this.fun.apply(null, this.array);
  };
  process.title = 'browser';
  process.browser = true;
  process.env = {};
  process.argv = [];
  process.version = ''; // empty string to avoid regexp issues
  process.versions = {};
  
  function noop() {}
  
  process.on = noop;
  process.addListener = noop;
  process.once = noop;
  process.off = noop;
  process.removeListener = noop;
  process.removeAllListeners = noop;
  process.emit = noop;
  
  process.binding = function (name) {
      throw new Error('process.binding is not supported');
  };
  
  process.cwd = function () { return '/' };
  process.chdir = function (dir) {
      throw new Error('process.chdir is not supported');
  };
  process.umask = function() { return 0; };
  
  },{}],13:[function(require,module,exports){
  module.exports = function isBuffer(arg) {
    return arg && typeof arg === 'object'
      && typeof arg.copy === 'function'
      && typeof arg.fill === 'function'
      && typeof arg.readUInt8 === 'function';
  }
  },{}],14:[function(require,module,exports){
  (function (process,global){
  // Copyright Joyent, Inc. and other Node contributors.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a
  // copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to permit
  // persons to whom the Software is furnished to do so, subject to the
  // following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  // USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  var formatRegExp = /%[sdj%]/g;
  exports.format = function(f) {
    if (!isString(f)) {
      var objects = [];
      for (var i = 0; i < arguments.length; i++) {
        objects.push(inspect(arguments[i]));
      }
      return objects.join(' ');
    }
  
    var i = 1;
    var args = arguments;
    var len = args.length;
    var str = String(f).replace(formatRegExp, function(x) {
      if (x === '%%') return '%';
      if (i >= len) return x;
      switch (x) {
        case '%s': return String(args[i++]);
        case '%d': return Number(args[i++]);
        case '%j':
          try {
            return JSON.stringify(args[i++]);
          } catch (_) {
            return '[Circular]';
          }
        default:
          return x;
      }
    });
    for (var x = args[i]; i < len; x = args[++i]) {
      if (isNull(x) || !isObject(x)) {
        str += ' ' + x;
      } else {
        str += ' ' + inspect(x);
      }
    }
    return str;
  };
  
  
  // Mark that a method should not be used.
  // Returns a modified function which warns once by default.
  // If --no-deprecation is set, then it is a no-op.
  exports.deprecate = function(fn, msg) {
    // Allow for deprecating things in the process of starting up.
    if (isUndefined(global.process)) {
      return function() {
        return exports.deprecate(fn, msg).apply(this, arguments);
      };
    }
  
    if (process.noDeprecation === true) {
      return fn;
    }
  
    var warned = false;
    function deprecated() {
      if (!warned) {
        if (process.throwDeprecation) {
          throw new Error(msg);
        } else if (process.traceDeprecation) {
          console.trace(msg);
        } else {
          console.error(msg);
        }
        warned = true;
      }
      return fn.apply(this, arguments);
    }
  
    return deprecated;
  };
  
  
  var debugs = {};
  var debugEnviron;
  exports.debuglog = function(set) {
    if (isUndefined(debugEnviron))
      debugEnviron = process.env.NODE_DEBUG || '';
    set = set.toUpperCase();
    if (!debugs[set]) {
      if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
        var pid = process.pid;
        debugs[set] = function() {
          var msg = exports.format.apply(exports, arguments);
          console.error('%s %d: %s', set, pid, msg);
        };
      } else {
        debugs[set] = function() {};
      }
    }
    return debugs[set];
  };
  
  
  /**
   * Echos the value of a value. Trys to print the value out
   * in the best way possible given the different types.
   *
   * @param {Object} obj The object to print out.
   * @param {Object} opts Optional options object that alters the output.
   */
  /* legacy: obj, showHidden, depth, colors*/
  function inspect(obj, opts) {
    // default options
    var ctx = {
      seen: [],
      stylize: stylizeNoColor
    };
    // legacy...
    if (arguments.length >= 3) ctx.depth = arguments[2];
    if (arguments.length >= 4) ctx.colors = arguments[3];
    if (isBoolean(opts)) {
      // legacy...
      ctx.showHidden = opts;
    } else if (opts) {
      // got an "options" object
      exports._extend(ctx, opts);
    }
    // set default options
    if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
    if (isUndefined(ctx.depth)) ctx.depth = 2;
    if (isUndefined(ctx.colors)) ctx.colors = false;
    if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
    if (ctx.colors) ctx.stylize = stylizeWithColor;
    return formatValue(ctx, obj, ctx.depth);
  }
  exports.inspect = inspect;
  
  
  // http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
  inspect.colors = {
    'bold' : [1, 22],
    'italic' : [3, 23],
    'underline' : [4, 24],
    'inverse' : [7, 27],
    'white' : [37, 39],
    'grey' : [90, 39],
    'black' : [30, 39],
    'blue' : [34, 39],
    'cyan' : [36, 39],
    'green' : [32, 39],
    'magenta' : [35, 39],
    'red' : [31, 39],
    'yellow' : [33, 39]
  };
  
  // Don't use 'blue' not visible on cmd.exe
  inspect.styles = {
    'special': 'cyan',
    'number': 'yellow',
    'boolean': 'yellow',
    'undefined': 'grey',
    'null': 'bold',
    'string': 'green',
    'date': 'magenta',
    // "name": intentionally not styling
    'regexp': 'red'
  };
  
  
  function stylizeWithColor(str, styleType) {
    var style = inspect.styles[styleType];
  
    if (style) {
      return '\u001b[' + inspect.colors[style][0] + 'm' + str +
             '\u001b[' + inspect.colors[style][1] + 'm';
    } else {
      return str;
    }
  }
  
  
  function stylizeNoColor(str, styleType) {
    return str;
  }
  
  
  function arrayToHash(array) {
    var hash = {};
  
    array.forEach(function(val, idx) {
      hash[val] = true;
    });
  
    return hash;
  }
  
  
  function formatValue(ctx, value, recurseTimes) {
    // Provide a hook for user-specified inspect functions.
    // Check that value is an object with an inspect function on it
    if (ctx.customInspect &&
        value &&
        isFunction(value.inspect) &&
        // Filter out the util module, it's inspect function is special
        value.inspect !== exports.inspect &&
        // Also filter out any prototype objects using the circular check.
        !(value.constructor && value.constructor.prototype === value)) {
      var ret = value.inspect(recurseTimes, ctx);
      if (!isString(ret)) {
        ret = formatValue(ctx, ret, recurseTimes);
      }
      return ret;
    }
  
    // Primitive types cannot have properties
    var primitive = formatPrimitive(ctx, value);
    if (primitive) {
      return primitive;
    }
  
    // Look up the keys of the object.
    var keys = Object.keys(value);
    var visibleKeys = arrayToHash(keys);
  
    if (ctx.showHidden) {
      keys = Object.getOwnPropertyNames(value);
    }
  
    // IE doesn't make error fields non-enumerable
    // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
    if (isError(value)
        && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
      return formatError(value);
    }
  
    // Some type of object without properties can be shortcutted.
    if (keys.length === 0) {
      if (isFunction(value)) {
        var name = value.name ? ': ' + value.name : '';
        return ctx.stylize('[Function' + name + ']', 'special');
      }
      if (isRegExp(value)) {
        return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
      }
      if (isDate(value)) {
        return ctx.stylize(Date.prototype.toString.call(value), 'date');
      }
      if (isError(value)) {
        return formatError(value);
      }
    }
  
    var base = '', array = false, braces = ['{', '}'];
  
    // Make Array say that they are Array
    if (isArray(value)) {
      array = true;
      braces = ['[', ']'];
    }
  
    // Make functions say that they are functions
    if (isFunction(value)) {
      var n = value.name ? ': ' + value.name : '';
      base = ' [Function' + n + ']';
    }
  
    // Make RegExps say that they are RegExps
    if (isRegExp(value)) {
      base = ' ' + RegExp.prototype.toString.call(value);
    }
  
    // Make dates with properties first say the date
    if (isDate(value)) {
      base = ' ' + Date.prototype.toUTCString.call(value);
    }
  
    // Make error with message first say the error
    if (isError(value)) {
      base = ' ' + formatError(value);
    }
  
    if (keys.length === 0 && (!array || value.length == 0)) {
      return braces[0] + base + braces[1];
    }
  
    if (recurseTimes < 0) {
      if (isRegExp(value)) {
        return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
      } else {
        return ctx.stylize('[Object]', 'special');
      }
    }
  
    ctx.seen.push(value);
  
    var output;
    if (array) {
      output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
    } else {
      output = keys.map(function(key) {
        return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
      });
    }
  
    ctx.seen.pop();
  
    return reduceToSingleString(output, base, braces);
  }
  
  
  function formatPrimitive(ctx, value) {
    if (isUndefined(value))
      return ctx.stylize('undefined', 'undefined');
    if (isString(value)) {
      var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
                                               .replace(/'/g, "\\'")
                                               .replace(/\\"/g, '"') + '\'';
      return ctx.stylize(simple, 'string');
    }
    if (isNumber(value))
      return ctx.stylize('' + value, 'number');
    if (isBoolean(value))
      return ctx.stylize('' + value, 'boolean');
    // For some reason typeof null is "object", so special case here.
    if (isNull(value))
      return ctx.stylize('null', 'null');
  }
  
  
  function formatError(value) {
    return '[' + Error.prototype.toString.call(value) + ']';
  }
  
  
  function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
    var output = [];
    for (var i = 0, l = value.length; i < l; ++i) {
      if (hasOwnProperty(value, String(i))) {
        output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
            String(i), true));
      } else {
        output.push('');
      }
    }
    keys.forEach(function(key) {
      if (!key.match(/^\d+$/)) {
        output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
            key, true));
      }
    });
    return output;
  }
  
  
  function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
    var name, str, desc;
    desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
    if (desc.get) {
      if (desc.set) {
        str = ctx.stylize('[Getter/Setter]', 'special');
      } else {
        str = ctx.stylize('[Getter]', 'special');
      }
    } else {
      if (desc.set) {
        str = ctx.stylize('[Setter]', 'special');
      }
    }
    if (!hasOwnProperty(visibleKeys, key)) {
      name = '[' + key + ']';
    }
    if (!str) {
      if (ctx.seen.indexOf(desc.value) < 0) {
        if (isNull(recurseTimes)) {
          str = formatValue(ctx, desc.value, null);
        } else {
          str = formatValue(ctx, desc.value, recurseTimes - 1);
        }
        if (str.indexOf('\n') > -1) {
          if (array) {
            str = str.split('\n').map(function(line) {
              return '  ' + line;
            }).join('\n').substr(2);
          } else {
            str = '\n' + str.split('\n').map(function(line) {
              return '   ' + line;
            }).join('\n');
          }
        }
      } else {
        str = ctx.stylize('[Circular]', 'special');
      }
    }
    if (isUndefined(name)) {
      if (array && key.match(/^\d+$/)) {
        return str;
      }
      name = JSON.stringify('' + key);
      if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
        name = name.substr(1, name.length - 2);
        name = ctx.stylize(name, 'name');
      } else {
        name = name.replace(/'/g, "\\'")
                   .replace(/\\"/g, '"')
                   .replace(/(^"|"$)/g, "'");
        name = ctx.stylize(name, 'string');
      }
    }
  
    return name + ': ' + str;
  }
  
  
  function reduceToSingleString(output, base, braces) {
    var numLinesEst = 0;
    var length = output.reduce(function(prev, cur) {
      numLinesEst++;
      if (cur.indexOf('\n') >= 0) numLinesEst++;
      return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
    }, 0);
  
    if (length > 60) {
      return braces[0] +
             (base === '' ? '' : base + '\n ') +
             ' ' +
             output.join(',\n  ') +
             ' ' +
             braces[1];
    }
  
    return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
  }
  
  
  // NOTE: These type checking functions intentionally don't use `instanceof`
  // because it is fragile and can be easily faked with `Object.create()`.
  function isArray(ar) {
    return Array.isArray(ar);
  }
  exports.isArray = isArray;
  
  function isBoolean(arg) {
    return typeof arg === 'boolean';
  }
  exports.isBoolean = isBoolean;
  
  function isNull(arg) {
    return arg === null;
  }
  exports.isNull = isNull;
  
  function isNullOrUndefined(arg) {
    return arg == null;
  }
  exports.isNullOrUndefined = isNullOrUndefined;
  
  function isNumber(arg) {
    return typeof arg === 'number';
  }
  exports.isNumber = isNumber;
  
  function isString(arg) {
    return typeof arg === 'string';
  }
  exports.isString = isString;
  
  function isSymbol(arg) {
    return typeof arg === 'symbol';
  }
  exports.isSymbol = isSymbol;
  
  function isUndefined(arg) {
    return arg === void 0;
  }
  exports.isUndefined = isUndefined;
  
  function isRegExp(re) {
    return isObject(re) && objectToString(re) === '[object RegExp]';
  }
  exports.isRegExp = isRegExp;
  
  function isObject(arg) {
    return typeof arg === 'object' && arg !== null;
  }
  exports.isObject = isObject;
  
  function isDate(d) {
    return isObject(d) && objectToString(d) === '[object Date]';
  }
  exports.isDate = isDate;
  
  function isError(e) {
    return isObject(e) &&
        (objectToString(e) === '[object Error]' || e instanceof Error);
  }
  exports.isError = isError;
  
  function isFunction(arg) {
    return typeof arg === 'function';
  }
  exports.isFunction = isFunction;
  
  function isPrimitive(arg) {
    return arg === null ||
           typeof arg === 'boolean' ||
           typeof arg === 'number' ||
           typeof arg === 'string' ||
           typeof arg === 'symbol' ||  // ES6 symbol
           typeof arg === 'undefined';
  }
  exports.isPrimitive = isPrimitive;
  
  exports.isBuffer = require('./support/isBuffer');
  
  function objectToString(o) {
    return Object.prototype.toString.call(o);
  }
  
  
  function pad(n) {
    return n < 10 ? '0' + n.toString(10) : n.toString(10);
  }
  
  
  var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
                'Oct', 'Nov', 'Dec'];
  
  // 26 Feb 16:19:34
  function timestamp() {
    var d = new Date();
    var time = [pad(d.getHours()),
                pad(d.getMinutes()),
                pad(d.getSeconds())].join(':');
    return [d.getDate(), months[d.getMonth()], time].join(' ');
  }
  
  
  // log is just a thin wrapper to console.log that prepends a timestamp
  exports.log = function() {
    console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
  };
  
  
  /**
   * Inherit the prototype methods from one constructor into another.
   *
   * The Function.prototype.inherits from lang.js rewritten as a standalone
   * function (not on Function.prototype). NOTE: If this file is to be loaded
   * during bootstrapping this function needs to be rewritten using some native
   * functions as prototype setup using normal JavaScript does not work as
   * expected during bootstrapping (see mirror.js in r114903).
   *
   * @param {function} ctor Constructor function which needs to inherit the
   *     prototype.
   * @param {function} superCtor Constructor function to inherit prototype from.
   */
  exports.inherits = require('inherits');
  
  exports._extend = function(origin, add) {
    // Don't do anything if add isn't an object
    if (!add || !isObject(add)) return origin;
  
    var keys = Object.keys(add);
    var i = keys.length;
    while (i--) {
      origin[keys[i]] = add[keys[i]];
    }
    return origin;
  };
  
  function hasOwnProperty(obj, prop) {
    return Object.prototype.hasOwnProperty.call(obj, prop);
  }
  
  }).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  },{"./support/isBuffer":13,"_process":12,"inherits":10}],15:[function(require,module,exports){
  var unparse = require('escodegen').generate;
  
  module.exports = function (ast, vars) {
      if (!vars) vars = {};
      var FAIL = {};
      
      var result = (function walk (node) {
          if (node.type === 'Literal') {
              return node.value;
          }
          else if (node.type === 'UnaryExpression'){
              var val = walk(node.argument)
              if (node.operator === '+') return +val
              if (node.operator === '-') return -val
              if (node.operator === '~') return ~val
              if (node.operator === '!') return !val
              return FAIL
          }
          else if (node.type === 'ArrayExpression') {
              var xs = [];
              for (var i = 0, l = node.elements.length; i < l; i++) {
                  var x = walk(node.elements[i]);
                  if (x === FAIL) return FAIL;
                  xs.push(x);
              }
              return xs;
          }
          else if (node.type === 'ObjectExpression') {
              var obj = {};
              for (var i = 0; i < node.properties.length; i++) {
                  var prop = node.properties[i];
                  var value = prop.value === null
                      ? prop.value
                      : walk(prop.value)
                  ;
                  if (value === FAIL) return FAIL;
                  obj[prop.key.value || prop.key.name] = value;
              }
              return obj;
          }
          else if (node.type === 'BinaryExpression' ||
                   node.type === 'LogicalExpression') {
              var l = walk(node.left);
              if (l === FAIL) return FAIL;
              var r = walk(node.right);
              if (r === FAIL) return FAIL;
              
              var op = node.operator;
              if (op === '==') return l == r;
              if (op === '===') return l === r;
              if (op === '!=') return l != r;
              if (op === '!==') return l !== r;
              if (op === '+') return l + r;
              if (op === '-') return l - r;
              if (op === '*') return l * r;
              if (op === '/') return l / r;
              if (op === '%') return l % r;
              if (op === '<') return l < r;
              if (op === '<=') return l <= r;
              if (op === '>') return l > r;
              if (op === '>=') return l >= r;
              if (op === '|') return l | r;
              if (op === '&') return l & r;
              if (op === '^') return l ^ r;
              if (op === '&&') return l && r;
              if (op === '||') return l || r;
              
              return FAIL;
          }
          else if (node.type === 'Identifier') {
              if ({}.hasOwnProperty.call(vars, node.name)) {
                  return vars[node.name];
              }
              else return FAIL;
          }
          else if (node.type === 'CallExpression') {
              var callee = walk(node.callee);
              if (callee === FAIL) return FAIL;
              
              var ctx = node.callee.object ? walk(node.callee.object) : FAIL;
              if (ctx === FAIL) ctx = null;
  
              var args = [];
              for (var i = 0, l = node.arguments.length; i < l; i++) {
                  var x = walk(node.arguments[i]);
                  if (x === FAIL) return FAIL;
                  args.push(x);
              }
              return callee.apply(ctx, args);
          }
          else if (node.type === 'MemberExpression') {
              var obj = walk(node.object);
              if (obj === FAIL) return FAIL;
              if (node.property.type === 'Identifier') {
                  return obj[node.property.name];
              }
              var prop = walk(node.property);
              if (prop === FAIL) return FAIL;
              return obj[prop];
          }
          else if (node.type === 'ConditionalExpression') {
              var val = walk(node.test)
              if (val === FAIL) return FAIL;
              return val ? walk(node.consequent) : walk(node.alternate)
          }
          else if (node.type === 'FunctionExpression') {
              return Function('return ' + unparse(node))();
          }
          else return FAIL;
      })(ast);
      
      return result === FAIL ? undefined : result;
  };
  
  },{"escodegen":8}],"jsonpath":[function(require,module,exports){
  module.exports = require('./lib/index');
  
  },{"./lib/index":5}]},{},["jsonpath"])("jsonpath")
  });