diff --git a/index.html b/index.html deleted file mode 100644 index 855387dbb8..0000000000 --- a/index.html +++ /dev/null @@ -1,1995 +0,0 @@ - acorn.js

acorn.js

Acorn is a tiny, fast JavaScript parser written in JavaScript.

- -

Acorn was written by Marijn Haverbeke and various contributors and -released under an MIT license. The Unicode regexps (for identifiers -and whitespace) were taken from Esprima by -Ariya Hidayat.

- -

Git repositories for Acorn are available at

- -
http://marijnhaverbeke.nl/git/acorn
-https://github.com/marijnh/acorn.git
-
- -

Please use the github bug tracker to report issues.

- -

This file defines the main parser interface. The library also comes -with a error-tolerant parser and an -abstract syntax tree walker, defined in other files.

 
(function(root, mod) {
-  if (typeof exports == "object" && typeof module == "object") return mod(exports); // CommonJS
-  if (typeof define == "function" && define.amd) return define(["exports"], mod); // AMD
-  mod(root.acorn || (root.acorn = {})); // Plain browser env
-})(this, function(exports) {
-  "use strict";
-
-  exports.version = "0.7.1";

The main exported interface (under self.acorn when in the -browser) is a parse function that takes a code string and -returns an abstract syntax tree as specified by Mozilla parser -API, with the caveat that inline XML is not recognized.

 
  var options, input, inputLen, sourceFile;
-
-  exports.parse = function(inpt, opts) {
-    input = String(inpt); inputLen = input.length;
-    setOptions(opts);
-    initTokenState();
-    return parseTopLevel(options.program);
-  };

A second optional argument can be given to further configure -the parser process. These options are recognized:

 
  var defaultOptions = exports.defaultOptions = {

ecmaVersion indicates the ECMAScript version to parse. Must -be either 3, or 5, or 6. This influences support for strict -mode, the set of reserved words, support for getters and -setters and other features.

 
    ecmaVersion: 5,

Turn on strictSemicolons to prevent the parser from doing -automatic semicolon insertion.

 
    strictSemicolons: false,

When allowTrailingCommas is false, the parser will not allow -trailing commas in array and object literals.

 
    allowTrailingCommas: true,

By default, reserved words are not enforced. Enable -forbidReserved to enforce them. When this option has the -value "everywhere", reserved words and keywords can also not be -used as property names.

 
    forbidReserved: false,

When enabled, a return at the top level is not considered an -error.

 
    allowReturnOutsideFunction: false,

When locations is on, loc properties holding objects with -start and end properties in {line, column} form (with -line being 1-based and column 0-based) will be attached to the -nodes.

 
    locations: false,

A function can be passed as onToken option, which will -cause Acorn to call that function with object in the same -format as tokenize() returns. Note that you are not -allowed to call the parser from the callback—that will -corrupt its internal state.

 
    onToken: null,

A function can be passed as onComment option, which will -cause Acorn to call that function with (block, text, start, -end) parameters whenever a comment is skipped. block is a -boolean indicating whether this is a block (/* */) comment, -text is the content of the comment, and start and end are -character offsets that denote the start and end of the comment. -When the locations option is on, two more parameters are -passed, the full {line, column} locations of the start and -end of the comments. Note that you are not allowed to call the -parser from the callback—that will corrupt its internal state.

 
    onComment: null,

Nodes have their start and end characters offsets recorded in -start and end properties (directly on the node, rather than -the loc object, which holds line/column data. To also add a -semi-standardized range property holding a [start, -end] array with the same numbers, set the ranges option to -true.

 
    ranges: false,

It is possible to parse multiple files into a single AST by -passing the tree produced by parsing the first file as -program option in subsequent parses. This will add the -toplevel forms of the parsed file to the Program (top) node -of an existing parse tree.

 
    program: null,

When locations is on, you can pass this to record the source -file in every node's loc object.

 
    sourceFile: null,

This value, if given, is stored in every node, whether -locations is on or off.

 
    directSourceFile: null
-  };
-
-  var isArray = function (obj) {
-    return Object.prototype.toString.call(obj) === "[object Array]";
-  };
-
-  function setOptions(opts) {
-    options = opts || {};
-    for (var opt in defaultOptions) if (!has(options, opt))
-      options[opt] = defaultOptions[opt];
-    sourceFile = options.sourceFile || null;
-    if (isArray(options.onToken)) {
-      var tokens = options.onToken;
-      options.onToken = function (token) {
-        tokens.push(token);
-      };
-    }
-    if (isArray(options.onComment)) {
-      var comments = options.onComment;
-      options.onComment = function (block, text, start, end, startLoc, endLoc) {
-        var comment = {
-          type: block ? 'Block' : 'Line',
-          value: text,
-          start: start,
-          end: end
-        };
-        if (options.locations) {
-          comment.loc = new SourceLocation();
-          comment.loc.start = startLoc;
-          comment.loc.end = endLoc;
-        }
-        if (options.ranges)
-          comment.range = [start, end];
-        comments.push(comment);
-      };
-    }
-    isKeyword = options.ecmaVersion >= 6 ? isEcma6Keyword : isEcma5AndLessKeyword;
-  }

The getLineInfo function is mostly useful when the -locations option is off (for performance reasons) and you -want to find the line/column position for a given character -offset. input should be the code string that the offset refers -into.

 
  var getLineInfo = exports.getLineInfo = function(input, offset) {
-    for (var line = 1, cur = 0;;) {
-      lineBreak.lastIndex = cur;
-      var match = lineBreak.exec(input);
-      if (match && match.index < offset) {
-        ++line;
-        cur = match.index + match[0].length;
-      } else break;
-    }
-    return {line: line, column: offset - cur};
-  };
-
-  function Token() {
-    this.type = tokType;
-    this.value = tokVal;
-    this.start = tokStart;
-    this.end = tokEnd;
-    if (options.locations) {
-      this.loc = new SourceLocation();
-      this.loc.end = tokEndLoc;

TODO: remove in next major release

 
      this.startLoc = tokStartLoc;
-      this.endLoc = tokEndLoc;
-    }
-    if (options.ranges)
-      this.range = [tokStart, tokEnd];
-  }
-
-  exports.Token = Token;

Acorn is organized as a tokenizer and a recursive-descent parser. -The tokenize export provides an interface to the tokenizer. -Because the tokenizer is optimized for being efficiently used by -the Acorn parser itself, this interface is somewhat crude and not -very modular. Performing another parse or call to tokenize will -reset the internal state, and invalidate existing tokenizers.

 
  exports.tokenize = function(inpt, opts) {
-    input = String(inpt); inputLen = input.length;
-    setOptions(opts);
-    initTokenState();
-
-    function getToken(forceRegexp) {
-      lastEnd = tokEnd;
-      readToken(forceRegexp);
-      return new Token();
-    }
-    getToken.jumpTo = function(pos, reAllowed) {
-      tokPos = pos;
-      if (options.locations) {
-        tokCurLine = 1;
-        tokLineStart = lineBreak.lastIndex = 0;
-        var match;
-        while ((match = lineBreak.exec(input)) && match.index < pos) {
-          ++tokCurLine;
-          tokLineStart = match.index + match[0].length;
-        }
-      }
-      tokRegexpAllowed = reAllowed;
-      skipSpace();
-    };
-    return getToken;
-  };

State is kept in (closure-)global variables. We already saw the -options, input, and inputLen variables above.

 
             		           
                               
                            
                                
               
The current position of the tokenizer in the input.
             		                            
  var tokPos;
             		           
                               
                            
                                
               
The start and end offsets of the current token.
             		                            
  var tokStart, tokEnd;
             		           
                               
                            
                                
               
When options.locations is true, these hold objects
-containing the tokens start and end line/column pairs.
             		                            
  var tokStartLoc, tokEndLoc;
             		           
                               
                            
                                
               
The type and value of the current token. Token types are objects,
-named by variables against which they can be compared, and
-holding properties that describe them (indicating, for example,
-the precedence of an infix operator, and the original name of a
-keyword token). The kind of value that's held in tokVal depends
-on the type of the token. For literals, it is the literal value,
-for operators, the operator name, and so on.
             		                            
  var tokType, tokVal;
             		           
                               
                            
                                
               
Internal state for the tokenizer. To distinguish between division
-operators and regular expressions, it remembers whether the last
-token was one that is allowed to be followed by an expression.
-(If it is, a slash is probably a regexp, if it isn't it's a
-division operator. See the parseStatement function for a
-caveat.)
             		                            
  var tokRegexpAllowed;
             		           
                               
                            
                                
               
When options.locations is true, these are used to keep
-track of the current line, and know when a new line has been
-entered.
             		                            
  var tokCurLine, tokLineStart;
             		           
                               
                            
                                
               
These store the position of the previous token, which is useful
-when finishing a node and assigning its end position.
             		                            
  var lastStart, lastEnd, lastEndLoc;
             		           
                               
                            
                                
               
This is the parser's state. inFunction is used to reject
-return statements outside of functions, inGenerator to
-reject yields outside of generators, labels to verify
-that break and continue have somewhere to jump to, and
-strict indicates whether strict mode is on.
             		                            
  var inFunction, inGenerator, labels, strict;
             		           
                               
                            
                                
               
This counter is used for checking that arrow expressions did
-not contain nested parentheses in argument list.
             		                            
  var metParenL;
             		           
                               
                            
                                
               
This is used by parser for detecting if it's inside ES6
-Template String. If it is, it should treat '$' as prefix before
-'{expression}' and everything else as string literals.
             		                            
  var inTemplate;
             		           
                               
                            
                                
               
This function is used to raise exceptions on parse errors. It
-takes an offset integer (into the current input) to indicate
-the location of the error, attaches the position to the end
-of the error message, and then raises a SyntaxError with that
-message.
             		                            
  function raise(pos, message) {
-    var loc = getLineInfo(input, pos);
-    message += " (" + loc.line + ":" + loc.column + ")";
-    var err = new SyntaxError(message);
-    err.pos = pos; err.loc = loc; err.raisedAt = tokPos;
-    throw err;
-  }
             		           
                               
                            
                                
               
Reused empty array added for node fields that are always empty.
             		                            
  var empty = [];
             		           
                               
                            
                                
               
Token types
             		                            
             		           
                               
                            
                                
               
The assignment of fine-grained, information-carrying type objects
-allows the tokenizer to store the information it has about a
-token in a way that is very cheap for the parser to look up.
             		                            
             		           
                               
                            
                                
               
All token type variables start with an underscore, to make them
-easy to recognize.
             		                            
             		           
                               
                            
                                
               
These are the general types. The type property is only used to
-make them recognizeable when debugging.
             		                            
  var _num = {type: "num"}, _regexp = {type: "regexp"}, _string = {type: "string"};
-  var _name = {type: "name"}, _eof = {type: "eof"};
             		           
                               
                            
                                
               
Keyword tokens. The keyword property (also used in keyword-like
-operators) indicates that the token originated from an
-identifier-like word, which is used when parsing property names.

-
-
The beforeExpr property is used to disambiguate between regular
-expressions and divisions. It is set on all token types that can
-be followed by an expression (thus, a slash after them would be a
-regular expression).

-
-
isLoop marks a keyword as starting a loop, which is important
-to know when parsing a label, in order to allow or disallow
-continue jumps to that label.
             		                            
  var _break = {keyword: "break"}, _case = {keyword: "case", beforeExpr: true}, _catch = {keyword: "catch"};
-  var _continue = {keyword: "continue"}, _debugger = {keyword: "debugger"}, _default = {keyword: "default"};
-  var _do = {keyword: "do", isLoop: true}, _else = {keyword: "else", beforeExpr: true};
-  var _finally = {keyword: "finally"}, _for = {keyword: "for", isLoop: true}, _function = {keyword: "function"};
-  var _if = {keyword: "if"}, _return = {keyword: "return", beforeExpr: true}, _switch = {keyword: "switch"};
-  var _throw = {keyword: "throw", beforeExpr: true}, _try = {keyword: "try"}, _var = {keyword: "var"};
-  var _let = {keyword: "let"}, _const = {keyword: "const"};
-  var _while = {keyword: "while", isLoop: true}, _with = {keyword: "with"}, _new = {keyword: "new", beforeExpr: true};
-  var _this = {keyword: "this"};
-  var _class = {keyword: "class"}, _extends = {keyword: "extends", beforeExpr: true};
-  var _export = {keyword: "export"}, _import = {keyword: "import"};
-  var _yield = {keyword: "yield", beforeExpr: true};
             		           
                               
                            
                                
               
The keywords that denote values.
             		                            
  var _null = {keyword: "null", atomValue: null}, _true = {keyword: "true", atomValue: true};
-  var _false = {keyword: "false", atomValue: false};
             		           
                               
                            
                                
               
Some keywords are treated as regular operators. in sometimes
-(when parsing for) needs to be tested against specifically, so
-we assign a variable name to it for quick comparing.
             		                            
  var _in = {keyword: "in", binop: 7, beforeExpr: true};
             		           
                               
                            
                                
               
Map keyword names to token types.
             		                            
  var keywordTypes = {"break": _break, "case": _case, "catch": _catch,
-                      "continue": _continue, "debugger": _debugger, "default": _default,
-                      "do": _do, "else": _else, "finally": _finally, "for": _for,
-                      "function": _function, "if": _if, "return": _return, "switch": _switch,
-                      "throw": _throw, "try": _try, "var": _var, "let": _let, "const": _const,
-                      "while": _while, "with": _with,
-                      "null": _null, "true": _true, "false": _false, "new": _new, "in": _in,
-                      "instanceof": {keyword: "instanceof", binop: 7, beforeExpr: true}, "this": _this,
-                      "typeof": {keyword: "typeof", prefix: true, beforeExpr: true},
-                      "void": {keyword: "void", prefix: true, beforeExpr: true},
-                      "delete": {keyword: "delete", prefix: true, beforeExpr: true},
-                      "class": _class, "extends": _extends,
-                      "export": _export, "import": _import, "yield": _yield};
             		           
                               
                            
                                
               
Punctuation token types. Again, the type property is purely for debugging.
             		                            
  var _bracketL = {type: "[", beforeExpr: true}, _bracketR = {type: "]"}, _braceL = {type: "{", beforeExpr: true};
-  var _braceR = {type: "}"}, _parenL = {type: "(", beforeExpr: true}, _parenR = {type: ")"};
-  var _comma = {type: ",", beforeExpr: true}, _semi = {type: ";", beforeExpr: true};
-  var _colon = {type: ":", beforeExpr: true}, _dot = {type: "."}, _ellipsis = {type: "..."}, _question = {type: "?", beforeExpr: true};
-  var _arrow = {type: "=>", beforeExpr: true}, _bquote = {type: "`"}, _dollarBraceL = {type: "${", beforeExpr: true};
             		           
                               
                            
                                
               
Operators. These carry several kinds of properties to help the
-parser use them properly (the presence of these properties is
-what categorizes them as operators).

-
-
binop, when present, specifies that this operator is a binary
-operator, and will refer to its precedence.

-
-
prefix and postfix mark the operator as a prefix or postfix
-unary operator. isUpdate specifies that the node produced by
-the operator should be of type UpdateExpression rather than
-simply UnaryExpression (++ and --).

-
-
isAssign marks all of =, +=, -= etcetera, which act as
-binary operators with a very low precedence, that should result
-in AssignmentExpression nodes.
             		                            
  var _slash = {binop: 10, beforeExpr: true}, _eq = {isAssign: true, beforeExpr: true};
-  var _assign = {isAssign: true, beforeExpr: true};
-  var _incDec = {postfix: true, prefix: true, isUpdate: true}, _prefix = {prefix: true, beforeExpr: true};
-  var _logicalOR = {binop: 1, beforeExpr: true};
-  var _logicalAND = {binop: 2, beforeExpr: true};
-  var _bitwiseOR = {binop: 3, beforeExpr: true};
-  var _bitwiseXOR = {binop: 4, beforeExpr: true};
-  var _bitwiseAND = {binop: 5, beforeExpr: true};
-  var _equality = {binop: 6, beforeExpr: true};
-  var _relational = {binop: 7, beforeExpr: true};
-  var _bitShift = {binop: 8, beforeExpr: true};
-  var _plusMin = {binop: 9, prefix: true, beforeExpr: true};
-  var _modulo = {binop: 10, beforeExpr: true};
             		           
                               
                            
                                
               
'*' may be multiply or have special meaning in ES6
             		                            
  var _star = {binop: 10, beforeExpr: true};
             		           
                               
                            
                                
               
Provide access to the token types for external users of the
-tokenizer.
             		                            
  exports.tokTypes = {bracketL: _bracketL, bracketR: _bracketR, braceL: _braceL, braceR: _braceR,
-                      parenL: _parenL, parenR: _parenR, comma: _comma, semi: _semi, colon: _colon,
-                      dot: _dot, ellipsis: _ellipsis, question: _question, slash: _slash, eq: _eq,
-                      name: _name, eof: _eof, num: _num, regexp: _regexp, string: _string,
-                      arrow: _arrow, bquote: _bquote, dollarBraceL: _dollarBraceL};
-  for (var kw in keywordTypes) exports.tokTypes["_" + kw] = keywordTypes[kw];
             		           
                               
                            
                                
               
This is a trick taken from Esprima. It turns out that, on
-non-Chrome browsers, to check whether a string is in a set, a
-predicate containing a big ugly switch statement is faster than
-a regular expression, and on Chrome the two are about on par.
-This function uses eval (non-lexical) to produce such a
-predicate from a space-separated string of words.

-
-
It starts by sorting the words by length.
             		                            
  function makePredicate(words) {
-    words = words.split(" ");
-    var f = "", cats = [];
-    out: for (var i = 0; i < words.length; ++i) {
-      for (var j = 0; j < cats.length; ++j)
-        if (cats[j][0].length == words[i].length) {
-          cats[j].push(words[i]);
-          continue out;
-        }
-      cats.push([words[i]]);
-    }
-    function compareTo(arr) {
-      if (arr.length == 1) return f += "return str === " + JSON.stringify(arr[0]) + ";";
-      f += "switch(str){";
-      for (var i = 0; i < arr.length; ++i) f += "case " + JSON.stringify(arr[i]) + ":";
-      f += "return true}return false;";
-    }
             		           
                               
                            
                                
               
When there are more than three length categories, an outer
-switch first dispatches on the lengths, to save on comparisons.
             		                            
    if (cats.length > 3) {
-      cats.sort(function(a, b) {return b.length - a.length;});
-      f += "switch(str.length){";
-      for (var i = 0; i < cats.length; ++i) {
-        var cat = cats[i];
-        f += "case " + cat[0].length + ":";
-        compareTo(cat);
-      }
-      f += "}";
             		           
                               
                            
                                
               
Otherwise, simply generate a flat switch statement.
             		                            
    } else {
-      compareTo(words);
-    }
-    return new Function("str", f);
-  }
             		           
                               
                            
                                
               
The ECMAScript 3 reserved word list.
             		                            
  var isReservedWord3 = makePredicate("abstract boolean byte char class double enum export extends final float goto implements import int interface long native package private protected public short static super synchronized throws transient volatile");
             		           
                               
                            
                                
               
ECMAScript 5 reserved words.
             		                            
  var isReservedWord5 = makePredicate("class enum extends super const export import");
             		           
                               
                            
                                
               
The additional reserved words in strict mode.
             		                            
  var isStrictReservedWord = makePredicate("implements interface let package private protected public static yield");
             		           
                               
                            
                                
               
The forbidden variable names in strict mode.
             		                            
  var isStrictBadIdWord = makePredicate("eval arguments");
             		           
                               
                            
                                
               
And the keywords.
             		                            
  var ecma5AndLessKeywords = "break case catch continue debugger default do else finally for function if return switch throw try var while with null true false instanceof typeof void delete new in this";
-
-  var isEcma5AndLessKeyword = makePredicate(ecma5AndLessKeywords);
-
-  var isEcma6Keyword = makePredicate(ecma5AndLessKeywords + " let const class extends export import yield");
-
-  var isKeyword = isEcma5AndLessKeyword;
             		           
                               
                            
                                
               
Character categories
             		                            
             		           
                               
                            
                                
               
Big ugly regular expressions that match characters in the
-whitespace, identifier, and identifier-start categories. These
-are only applied when a character is found to actually have a
-code point above 128.
-Generated by tools/generate-identifier-regex.js.
             		                            
  var nonASCIIwhitespace = /[\u1680\u180e\u2000-\u200a\u202f\u205f\u3000\ufeff]/;
-  var nonASCIIidentifierStartChars = "\xAA\xB5\xBA\xC0-\xD6\xD8-\xF6\xF8-\u02C1\u02C6-\u02D1\u02E0-\u02E4\u02EC\u02EE\u0370-\u0374\u0376\u0377\u037A-\u037D\u037F\u0386\u0388-\u038A\u038C\u038E-\u03A1\u03A3-\u03F5\u03F7-\u0481\u048A-\u052F\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-\u08B2\u0904-\u0939\u093D\u0950\u0958-\u0961\u0971-\u0980\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-\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-\u16F8\u1700-\u170C\u170E-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176C\u176E-\u1770\u1780-\u17B3\u17D7\u17DC\u1820-\u1877\u1880-\u18A8\u18AA\u18B0-\u18F5\u1900-\u191E\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-\uA69D\uA6A0-\uA6EF\uA717-\uA71F\uA722-\uA788\uA78B-\uA78E\uA790-\uA7AD\uA7B0\uA7B1\uA7F7-\uA801\uA803-\uA805\uA807-\uA80A\uA80C-\uA822\uA840-\uA873\uA882-\uA8B3\uA8F2-\uA8F7\uA8FB\uA90A-\uA925\uA930-\uA946\uA960-\uA97C\uA984-\uA9B2\uA9CF\uA9E0-\uA9E4\uA9E6-\uA9EF\uA9FA-\uA9FE\uAA00-\uAA28\uAA40-\uAA42\uAA44-\uAA4B\uAA60-\uAA76\uAA7A\uAA7E-\uAAAF\uAAB1\uAAB5\uAAB6\uAAB9-\uAABD\uAAC0\uAAC2\uAADB-\uAADD\uAAE0-\uAAEA\uAAF2-\uAAF4\uAB01-\uAB06\uAB09-\uAB0E\uAB11-\uAB16\uAB20-\uAB26\uAB28-\uAB2E\uAB30-\uAB5A\uAB5C-\uAB5F\uAB64\uAB65\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";
-  var nonASCIIidentifierChars = "\u0300-\u036F\u0483-\u0487\u0591-\u05BD\u05BF\u05C1\u05C2\u05C4\u05C5\u05C7\u0610-\u061A\u064B-\u0669\u0670\u06D6-\u06DC\u06DF-\u06E4\u06E7\u06E8\u06EA-\u06ED\u06F0-\u06F9\u0711\u0730-\u074A\u07A6-\u07B0\u07C0-\u07C9\u07EB-\u07F3\u0816-\u0819\u081B-\u0823\u0825-\u0827\u0829-\u082D\u0859-\u085B\u08E4-\u0903\u093A-\u093C\u093E-\u094F\u0951-\u0957\u0962\u0963\u0966-\u096F\u0981-\u0983\u09BC\u09BE-\u09C4\u09C7\u09C8\u09CB-\u09CD\u09D7\u09E2\u09E3\u09E6-\u09EF\u0A01-\u0A03\u0A3C\u0A3E-\u0A42\u0A47\u0A48\u0A4B-\u0A4D\u0A51\u0A66-\u0A71\u0A75\u0A81-\u0A83\u0ABC\u0ABE-\u0AC5\u0AC7-\u0AC9\u0ACB-\u0ACD\u0AE2\u0AE3\u0AE6-\u0AEF\u0B01-\u0B03\u0B3C\u0B3E-\u0B44\u0B47\u0B48\u0B4B-\u0B4D\u0B56\u0B57\u0B62\u0B63\u0B66-\u0B6F\u0B82\u0BBE-\u0BC2\u0BC6-\u0BC8\u0BCA-\u0BCD\u0BD7\u0BE6-\u0BEF\u0C00-\u0C03\u0C3E-\u0C44\u0C46-\u0C48\u0C4A-\u0C4D\u0C55\u0C56\u0C62\u0C63\u0C66-\u0C6F\u0C81-\u0C83\u0CBC\u0CBE-\u0CC4\u0CC6-\u0CC8\u0CCA-\u0CCD\u0CD5\u0CD6\u0CE2\u0CE3\u0CE6-\u0CEF\u0D01-\u0D03\u0D3E-\u0D44\u0D46-\u0D48\u0D4A-\u0D4D\u0D57\u0D62\u0D63\u0D66-\u0D6F\u0D82\u0D83\u0DCA\u0DCF-\u0DD4\u0DD6\u0DD8-\u0DDF\u0DE6-\u0DEF\u0DF2\u0DF3\u0E31\u0E34-\u0E3A\u0E47-\u0E4E\u0E50-\u0E59\u0EB1\u0EB4-\u0EB9\u0EBB\u0EBC\u0EC8-\u0ECD\u0ED0-\u0ED9\u0F18\u0F19\u0F20-\u0F29\u0F35\u0F37\u0F39\u0F3E\u0F3F\u0F71-\u0F84\u0F86\u0F87\u0F8D-\u0F97\u0F99-\u0FBC\u0FC6\u102B-\u103E\u1040-\u1049\u1056-\u1059\u105E-\u1060\u1062-\u1064\u1067-\u106D\u1071-\u1074\u1082-\u108D\u108F-\u109D\u135D-\u135F\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17B4-\u17D3\u17DD\u17E0-\u17E9\u180B-\u180D\u1810-\u1819\u18A9\u1920-\u192B\u1930-\u193B\u1946-\u194F\u19B0-\u19C0\u19C8\u19C9\u19D0-\u19D9\u1A17-\u1A1B\u1A55-\u1A5E\u1A60-\u1A7C\u1A7F-\u1A89\u1A90-\u1A99\u1AB0-\u1ABD\u1B00-\u1B04\u1B34-\u1B44\u1B50-\u1B59\u1B6B-\u1B73\u1B80-\u1B82\u1BA1-\u1BAD\u1BB0-\u1BB9\u1BE6-\u1BF3\u1C24-\u1C37\u1C40-\u1C49\u1C50-\u1C59\u1CD0-\u1CD2\u1CD4-\u1CE8\u1CED\u1CF2-\u1CF4\u1CF8\u1CF9\u1DC0-\u1DF5\u1DFC-\u1DFF\u200C\u200D\u203F\u2040\u2054\u20D0-\u20DC\u20E1\u20E5-\u20F0\u2CEF-\u2CF1\u2D7F\u2DE0-\u2DFF\u302A-\u302F\u3099\u309A\uA620-\uA629\uA66F\uA674-\uA67D\uA69F\uA6F0\uA6F1\uA802\uA806\uA80B\uA823-\uA827\uA880\uA881\uA8B4-\uA8C4\uA8D0-\uA8D9\uA8E0-\uA8F1\uA900-\uA909\uA926-\uA92D\uA947-\uA953\uA980-\uA983\uA9B3-\uA9C0\uA9D0-\uA9D9\uA9E5\uA9F0-\uA9F9\uAA29-\uAA36\uAA43\uAA4C\uAA4D\uAA50-\uAA59\uAA7B-\uAA7D\uAAB0\uAAB2-\uAAB4\uAAB7\uAAB8\uAABE\uAABF\uAAC1\uAAEB-\uAAEF\uAAF5\uAAF6\uABE3-\uABEA\uABEC\uABED\uABF0-\uABF9\uFB1E\uFE00-\uFE0F\uFE20-\uFE2D\uFE33\uFE34\uFE4D-\uFE4F\uFF10-\uFF19\uFF3F";
-  var nonASCIIidentifierStart = new RegExp("[" + nonASCIIidentifierStartChars + "]");
-  var nonASCIIidentifier = new RegExp("[" + nonASCIIidentifierStartChars + nonASCIIidentifierChars + "]");
             		           
                               
                            
                                
               
Whether a single character denotes a newline.
             		                            
  var newline = /[\n\r\u2028\u2029]/;
             		           
                               
                            
                                
               
Matches a whole line break (where CRLF is considered a single
-line break). Used to count lines.
             		                            
  var lineBreak = /\r\n|[\n\r\u2028\u2029]/g;
             		           
                               
                            
                                
               
Test whether a given character code starts an identifier.
             		                            
  var isIdentifierStart = exports.isIdentifierStart = function(code) {
-    if (code < 65) return code === 36;
-    if (code < 91) return true;
-    if (code < 97) return code === 95;
-    if (code < 123)return true;
-    return code >= 0xaa && nonASCIIidentifierStart.test(String.fromCharCode(code));
-  };
             		           
                               
                            
                                
               
Test whether a given character is part of an identifier.
             		                            
  var isIdentifierChar = exports.isIdentifierChar = function(code) {
-    if (code < 48) return code === 36;
-    if (code < 58) return true;
-    if (code < 65) return false;
-    if (code < 91) return true;
-    if (code < 97) return code === 95;
-    if (code < 123)return true;
-    return code >= 0xaa && nonASCIIidentifier.test(String.fromCharCode(code));
-  };
             		           
                               
                            
                                
               
Tokenizer
             		                            
             		           
                               
                            
                                
               
These are used when options.locations is on, for the
-tokStartLoc and tokEndLoc properties.
             		                            
  function Position() {
-    this.line = tokCurLine;
-    this.column = tokPos - tokLineStart;
-  }
             		           
                               
                            
                                
               
Reset the token state. Used at the start of a parse.
             		                            
  function initTokenState() {
-    tokCurLine = 1;
-    tokPos = tokLineStart = 0;
-    tokRegexpAllowed = true;
-    metParenL = 0;
-    inTemplate = false;
-    skipSpace();
-  }
             		           
                               
                            
                                
               
Called at the end of every token. Sets tokEnd, tokVal, and
-tokRegexpAllowed, and skips the space after the token, so that
-the next one's tokStart will point at the right position.
             		                            
  function finishToken(type, val, shouldSkipSpace) {
-    tokEnd = tokPos;
-    if (options.locations) tokEndLoc = new Position;
-    tokType = type;
-    if (shouldSkipSpace !== false) skipSpace();
-    tokVal = val;
-    tokRegexpAllowed = type.beforeExpr;
-    if (options.onToken) {
-      options.onToken(new Token());
-    }
-  }
-
-  function skipBlockComment() {
-    var startLoc = options.onComment && options.locations && new Position;
-    var start = tokPos, end = input.indexOf("*/", tokPos += 2);
-    if (end === -1) raise(tokPos - 2, "Unterminated comment");
-    tokPos = end + 2;
-    if (options.locations) {
-      lineBreak.lastIndex = start;
-      var match;
-      while ((match = lineBreak.exec(input)) && match.index < tokPos) {
-        ++tokCurLine;
-        tokLineStart = match.index + match[0].length;
-      }
-    }
-    if (options.onComment)
-      options.onComment(true, input.slice(start + 2, end), start, tokPos,
-                        startLoc, options.locations && new Position);
-  }
-
-  function skipLineComment(startSkip) {
-    var start = tokPos;
-    var startLoc = options.onComment && options.locations && new Position;
-    var ch = input.charCodeAt(tokPos+=startSkip);
-    while (tokPos < inputLen && ch !== 10 && ch !== 13 && ch !== 8232 && ch !== 8233) {
-      ++tokPos;
-      ch = input.charCodeAt(tokPos);
-    }
-    if (options.onComment)
-      options.onComment(false, input.slice(start + startSkip, tokPos), start, tokPos,
-                        startLoc, options.locations && new Position);
-  }
             		           
                               
                            
                                
               
Called at the start of the parse and after every token. Skips
-whitespace and comments, and.
             		                            
  function skipSpace() {
-    while (tokPos < inputLen) {
-      var ch = input.charCodeAt(tokPos);
-      if (ch === 32) { // ' '
-        ++tokPos;
-      } else if (ch === 13) {
-        ++tokPos;
-        var next = input.charCodeAt(tokPos);
-        if (next === 10) {
-          ++tokPos;
-        }
-        if (options.locations) {
-          ++tokCurLine;
-          tokLineStart = tokPos;
-        }
-      } else if (ch === 10 || ch === 8232 || ch === 8233) {
-        ++tokPos;
-        if (options.locations) {
-          ++tokCurLine;
-          tokLineStart = tokPos;
-        }
-      } else if (ch > 8 && ch < 14) {
-        ++tokPos;
-      } else if (ch === 47) { // '/'
-        var next = input.charCodeAt(tokPos + 1);
-        if (next === 42) { // '*'
-          skipBlockComment();
-        } else if (next === 47) { // '/'
-          skipLineComment(2);
-        } else break;
-      } else if (ch === 160) { // '\xa0'
-        ++tokPos;
-      } else if (ch >= 5760 && nonASCIIwhitespace.test(String.fromCharCode(ch))) {
-        ++tokPos;
-      } else {
-        break;
-      }
-    }
-  }
             		           
                               
                            
                                
               
Token reading
             		                            
             		           
                               
                            
                                
               
This is the function that is called to fetch the next token. It
-is somewhat obscure, because it works in character codes rather
-than characters, and because operator parsing has been inlined
-into it.

-
-
All in the name of speed.

-
-
The forceRegexp parameter is used in the one case where the
-tokRegexpAllowed trick does not work. See parseStatement.
             		                            
  function readToken_dot() {
-    var next = input.charCodeAt(tokPos + 1);
-    if (next >= 48 && next <= 57) return readNumber(true);
-    var next2 = input.charCodeAt(tokPos + 2);
-    if (options.ecmaVersion >= 6 && next === 46 && next2 === 46) { // 46 = dot '.'
-      tokPos += 3;
-      return finishToken(_ellipsis);
-    } else {
-      ++tokPos;
-      return finishToken(_dot);
-    }
-  }
-
-  function readToken_slash() { // '/'
-    var next = input.charCodeAt(tokPos + 1);
-    if (tokRegexpAllowed) {++tokPos; return readRegexp();}
-    if (next === 61) return finishOp(_assign, 2);
-    return finishOp(_slash, 1);
-  }
-
-  function readToken_mult_modulo(code) { // '%*'
-    var next = input.charCodeAt(tokPos + 1);
-    if (next === 61) return finishOp(_assign, 2);
-    return finishOp(code === 42 ? _star : _modulo, 1);
-  }
-
-  function readToken_pipe_amp(code) { // '|&'
-    var next = input.charCodeAt(tokPos + 1);
-    if (next === code) return finishOp(code === 124 ? _logicalOR : _logicalAND, 2);
-    if (next === 61) return finishOp(_assign, 2);
-    return finishOp(code === 124 ? _bitwiseOR : _bitwiseAND, 1);
-  }
-
-  function readToken_caret() { // '^'
-    var next = input.charCodeAt(tokPos + 1);
-    if (next === 61) return finishOp(_assign, 2);
-    return finishOp(_bitwiseXOR, 1);
-  }
-
-  function readToken_plus_min(code) { // '+-'
-    var next = input.charCodeAt(tokPos + 1);
-    if (next === code) {
-      if (next == 45 && input.charCodeAt(tokPos + 2) == 62 &&
-          newline.test(input.slice(lastEnd, tokPos))) {
             		           
                               
                            
                                
               
A --> line comment
             		                            
        skipLineComment(3);
-        skipSpace();
-        return readToken();
-      }
-      return finishOp(_incDec, 2);
-    }
-    if (next === 61) return finishOp(_assign, 2);
-    return finishOp(_plusMin, 1);
-  }
-
-  function readToken_lt_gt(code) { // '<>'
-    var next = input.charCodeAt(tokPos + 1);
-    var size = 1;
-    if (next === code) {
-      size = code === 62 && input.charCodeAt(tokPos + 2) === 62 ? 3 : 2;
-      if (input.charCodeAt(tokPos + size) === 61) return finishOp(_assign, size + 1);
-      return finishOp(_bitShift, size);
-    }
-    if (next == 33 && code == 60 && input.charCodeAt(tokPos + 2) == 45 &&
-        input.charCodeAt(tokPos + 3) == 45) {
             		           
                               
                            
                                
               
<!--, an XML-style comment that should be interpreted as a line comment
             		                            
      skipLineComment(4);
-      skipSpace();
-      return readToken();
-    }
-    if (next === 61)
-      size = input.charCodeAt(tokPos + 2) === 61 ? 3 : 2;
-    return finishOp(_relational, size);
-  }
-
-  function readToken_eq_excl(code) { // '=!', '=>'
-    var next = input.charCodeAt(tokPos + 1);
-    if (next === 61) return finishOp(_equality, input.charCodeAt(tokPos + 2) === 61 ? 3 : 2);
-    if (code === 61 && next === 62 && options.ecmaVersion >= 6) { // '=>'
-      tokPos += 2;
-      return finishToken(_arrow);
-    }
-    return finishOp(code === 61 ? _eq : _prefix, 1);
-  }
             		           
                               
                            
                                
               
Get token inside ES6 template (special rules work there).
             		                            
  function getTemplateToken(code) {
             		           
                               
                            
                                
               
'`' and '${' have special meanings, but they should follow
-string (can be empty)
             		                            
    if (tokType === _string) {
-      if (code === 96) { // '`'
-        ++tokPos;
-        return finishToken(_bquote);
-      } else
-      if (code === 36 && input.charCodeAt(tokPos + 1) === 123) { // '${'
-        tokPos += 2;
-        return finishToken(_dollarBraceL);
-      }
-    }
-
-    if (code === 125) { // '}'
-      ++tokPos;
-      return finishToken(_braceR, undefined, false);
-    }
             		           
                               
                            
                                
               
anything else is considered string literal
             		                            
    return readTmplString();
-  }
-
-  function getTokenFromCode(code) {
-    switch (code) {
             		           
                               
                            
                                
               
The interpretation of a dot depends on whether it is followed
-by a digit or another two dots.
             		                            
    case 46: // '.'
-      return readToken_dot();
             		           
                               
                            
                                
               
Punctuation tokens.
             		                            
    case 40: ++tokPos; return finishToken(_parenL);
-    case 41: ++tokPos; return finishToken(_parenR);
-    case 59: ++tokPos; return finishToken(_semi);
-    case 44: ++tokPos; return finishToken(_comma);
-    case 91: ++tokPos; return finishToken(_bracketL);
-    case 93: ++tokPos; return finishToken(_bracketR);
-    case 123: ++tokPos; return finishToken(_braceL);
-    case 125: ++tokPos; return finishToken(_braceR);
-    case 58: ++tokPos; return finishToken(_colon);
-    case 63: ++tokPos; return finishToken(_question);
-
-    case 96: // '`'
-      if (options.ecmaVersion >= 6) {
-        ++tokPos;
-        return finishToken(_bquote, undefined, false);
-      }
-
-    case 48: // '0'
-      var next = input.charCodeAt(tokPos + 1);
-      if (next === 120 || next === 88) return readRadixNumber(16); // '0x', '0X' - hex number
-      if (options.ecmaVersion >= 6) {
-        if (next === 111 || next === 79) return readRadixNumber(8); // '0o', '0O' - octal number
-        if (next === 98 || next === 66) return readRadixNumber(2); // '0b', '0B' - binary number
-      }
             		           
                               
                            
                                
               
Anything else beginning with a digit is an integer, octal
-number, or float.
             		                            
    case 49: case 50: case 51: case 52: case 53: case 54: case 55: case 56: case 57: // 1-9
-      return readNumber(false);
             		           
                               
                            
                                
               
Quotes produce strings.
             		                            
    case 34: case 39: // '"', "'"
-      return readString(code);
             		           
                               
                            
                                
               
Operators are parsed inline in tiny state machines. '=' (61) is
-often referred to. finishOp simply skips the amount of
-characters it is given as second argument, and returns a token
-of the type given by its first argument.
             		                            
    case 47: // '/'
-      return readToken_slash();
-
-    case 37: case 42: // '%*'
-      return readToken_mult_modulo(code);
-
-    case 124: case 38: // '|&'
-      return readToken_pipe_amp(code);
-
-    case 94: // '^'
-      return readToken_caret();
-
-    case 43: case 45: // '+-'
-      return readToken_plus_min(code);
-
-    case 60: case 62: // '<>'
-      return readToken_lt_gt(code);
-
-    case 61: case 33: // '=!'
-      return readToken_eq_excl(code);
-
-    case 126: // '~'
-      return finishOp(_prefix, 1);
-    }
-
-    return false;
-  }
-
-  function readToken(forceRegexp) {
-    if (!forceRegexp) tokStart = tokPos;
-    else tokPos = tokStart + 1;
-    if (options.locations) tokStartLoc = new Position;
-    if (forceRegexp) return readRegexp();
-    if (tokPos >= inputLen) return finishToken(_eof);
-
-    var code = input.charCodeAt(tokPos);
-
-    if (inTemplate) return getTemplateToken(code);
             		           
                               
                            
                                
               
Identifier or keyword. '\uXXXX' sequences are allowed in
-identifiers, so '\' also dispatches to that.
             		                            
    if (isIdentifierStart(code) || code === 92 /* '\' */) return readWord();
-
-    var tok = getTokenFromCode(code);
-
-    if (tok === false) {
             		           
                               
                            
                                
               
If we are here, we either found a non-ASCII identifier
-character, or something that's entirely disallowed.
             		                            
      var ch = String.fromCharCode(code);
-      if (ch === "\\" || nonASCIIidentifierStart.test(ch)) return readWord();
-      raise(tokPos, "Unexpected character '" + ch + "'");
-    }
-    return tok;
-  }
-
-  function finishOp(type, size) {
-    var str = input.slice(tokPos, tokPos + size);
-    tokPos += size;
-    finishToken(type, str);
-  }
             		           
                               
                            
                                
               
Parse a regular expression. Some context-awareness is necessary,
-since a '/' inside a '[]' set does not end the expression.
             		                            
  function readRegexp() {
-    var content = "", escaped, inClass, start = tokPos;
-    for (;;) {
-      if (tokPos >= inputLen) raise(start, "Unterminated regular expression");
-      var ch = input.charAt(tokPos);
-      if (newline.test(ch)) raise(start, "Unterminated regular expression");
-      if (!escaped) {
-        if (ch === "[") inClass = true;
-        else if (ch === "]" && inClass) inClass = false;
-        else if (ch === "/" && !inClass) break;
-        escaped = ch === "\\";
-      } else escaped = false;
-      ++tokPos;
-    }
-    var content = input.slice(start, tokPos);
-    ++tokPos;
             		           
                               
                            
                                
               
Need to use readWord1 because '\uXXXX' sequences are allowed
-here (don't ask).
             		                            
    var mods = readWord1();
-    if (mods && !/^[gmsiy]*$/.test(mods)) raise(start, "Invalid regular expression flag");
-    try {
-      var value = new RegExp(content, mods);
-    } catch (e) {
-      if (e instanceof SyntaxError) raise(start, "Error parsing regular expression: " + e.message);
-      raise(e);
-    }
-    return finishToken(_regexp, value);
-  }
             		           
                               
                            
                                
               
Read an integer in the given radix. Return null if zero digits
-were read, the integer value otherwise. When len is given, this
-will return null unless the integer has exactly len digits.
             		                            
  function readInt(radix, len) {
-    var start = tokPos, total = 0;
-    for (var i = 0, e = len == null ? Infinity : len; i < e; ++i) {
-      var code = input.charCodeAt(tokPos), val;
-      if (code >= 97) val = code - 97 + 10; // a
-      else if (code >= 65) val = code - 65 + 10; // A
-      else if (code >= 48 && code <= 57) val = code - 48; // 0-9
-      else val = Infinity;
-      if (val >= radix) break;
-      ++tokPos;
-      total = total * radix + val;
-    }
-    if (tokPos === start || len != null && tokPos - start !== len) return null;
-
-    return total;
-  }
-
-  function readRadixNumber(radix) {
-    tokPos += 2; // 0x
-    var val = readInt(radix);
-    if (val == null) raise(tokStart + 2, "Expected number in radix " + radix);
-    if (isIdentifierStart(input.charCodeAt(tokPos))) raise(tokPos, "Identifier directly after number");
-    return finishToken(_num, val);
-  }
             		           
                               
                            
                                
               
Read an integer, octal integer, or floating-point number.
             		                            
  function readNumber(startsWithDot) {
-    var start = tokPos, isFloat = false, octal = input.charCodeAt(tokPos) === 48;
-    if (!startsWithDot && readInt(10) === null) raise(start, "Invalid number");
-    if (input.charCodeAt(tokPos) === 46) {
-      ++tokPos;
-      readInt(10);
-      isFloat = true;
-    }
-    var next = input.charCodeAt(tokPos);
-    if (next === 69 || next === 101) { // 'eE'
-      next = input.charCodeAt(++tokPos);
-      if (next === 43 || next === 45) ++tokPos; // '+-'
-      if (readInt(10) === null) raise(start, "Invalid number");
-      isFloat = true;
-    }
-    if (isIdentifierStart(input.charCodeAt(tokPos))) raise(tokPos, "Identifier directly after number");
-
-    var str = input.slice(start, tokPos), val;
-    if (isFloat) val = parseFloat(str);
-    else if (!octal || str.length === 1) val = parseInt(str, 10);
-    else if (/[89]/.test(str) || strict) raise(start, "Invalid number");
-    else val = parseInt(str, 8);
-    return finishToken(_num, val);
-  }
             		           
                               
                            
                                
               
Read a string value, interpreting backslash-escapes.
             		                            
  function readCodePoint() {
-    var ch = input.charCodeAt(tokPos), code;
-
-    if (ch === 123) {
-      if (options.ecmaVersion < 6) unexpected();
-      ++tokPos;
-      code = readHexChar(input.indexOf('}', tokPos) - tokPos);
-      ++tokPos;
-      if (code > 0x10FFFF) unexpected();
-    } else {
-      code = readHexChar(4);
-    }
             		           
                               
                            
                                
               
UTF-16 Encoding
             		                            
    if (code <= 0xFFFF) {
-      return String.fromCharCode(code);
-    }
-    var cu1 = ((code - 0x10000) >> 10) + 0xD800;
-    var cu2 = ((code - 0x10000) & 1023) + 0xDC00;
-    return String.fromCharCode(cu1, cu2);
-  }
-
-  function readString(quote) {
-    ++tokPos;
-    var out = "";
-    for (;;) {
-      if (tokPos >= inputLen) raise(tokStart, "Unterminated string constant");
-      var ch = input.charCodeAt(tokPos);
-      if (ch === quote) {
-        ++tokPos;
-        return finishToken(_string, out);
-      }
-      if (ch === 92) { // '\'
-        out += readEscapedChar();
-      } else {
-        ++tokPos;
-        if (newline.test(String.fromCharCode(ch))) {
-          raise(tokStart, "Unterminated string constant");
-        }
-        out += String.fromCharCode(ch); // '\'
-      }
-    }
-  }
-
-  function readTmplString() {
-    var out = "";
-    for (;;) {
-      if (tokPos >= inputLen) raise(tokStart, "Unterminated string constant");
-      var ch = input.charCodeAt(tokPos);
-      if (ch === 96 || ch === 36 && input.charCodeAt(tokPos + 1) === 123) // '`', '${'
-        return finishToken(_string, out);
-      if (ch === 92) { // '\'
-        out += readEscapedChar();
-      } else {
-        ++tokPos;
-        if (newline.test(String.fromCharCode(ch))) {
-          if (ch === 13 && input.charCodeAt(tokPos) === 10) {
-            ++tokPos;
-            ch = 10;
-          }
-          if (options.locations) {
-            ++tokCurLine;
-            tokLineStart = tokPos;
-          }
-        }
-        out += String.fromCharCode(ch); // '\'
-      }
-    }
-  }
             		           
                               
                            
                                
               
Used to read escaped characters
             		                            
  function readEscapedChar() {
-    var ch = input.charCodeAt(++tokPos);
-    var octal = /^[0-7]+/.exec(input.slice(tokPos, tokPos + 3));
-    if (octal) octal = octal[0];
-    while (octal && parseInt(octal, 8) > 255) octal = octal.slice(0, -1);
-    if (octal === "0") octal = null;
-    ++tokPos;
-    if (octal) {
-      if (strict) raise(tokPos - 2, "Octal literal in strict mode");
-      tokPos += octal.length - 1;
-      return String.fromCharCode(parseInt(octal, 8));
-    } else {
-      switch (ch) {
-        case 110: return "\n"; // 'n' -> '\n'
-        case 114: return "\r"; // 'r' -> '\r'
-        case 120: return String.fromCharCode(readHexChar(2)); // 'x'
-        case 117: return readCodePoint(); // 'u'
-        case 85: return String.fromCharCode(readHexChar(8)); // 'U'
-        case 116: return "\t"; // 't' -> '\t'
-        case 98: return "\b"; // 'b' -> '\b'
-        case 118: return "\u000b"; // 'v' -> '\u000b'
-        case 102: return "\f"; // 'f' -> '\f'
-        case 48: return "\0"; // 0 -> '\0'
-        case 13: if (input.charCodeAt(tokPos) === 10) ++tokPos; // '\r\n'
-        case 10: // ' \n'
-          if (options.locations) { tokLineStart = tokPos; ++tokCurLine; }
-          return "";
-        default: return String.fromCharCode(ch);
-      }
-    }
-  }
             		           
                               
                            
                                
               
Used to read character escape sequences ('\x', '\u', '\U').
             		                            
  function readHexChar(len) {
-    var n = readInt(16, len);
-    if (n === null) raise(tokStart, "Bad character escape sequence");
-    return n;
-  }
             		           
                               
                            
                                
               
Used to signal to callers of readWord1 whether the word
-contained any escape sequences. This is needed because words with
-escape sequences must not be interpreted as keywords.
             		                            
  var containsEsc;
             		           
                               
                            
                                
               
Read an identifier, and return it as a string. Sets containsEsc
-to whether the word contained a '\u' escape.

-
-
Only builds up the word character-by-character when it actually
-containeds an escape, as a micro-optimization.
             		                            
  function readWord1() {
-    containsEsc = false;
-    var word, first = true, start = tokPos;
-    for (;;) {
-      var ch = input.charCodeAt(tokPos);
-      if (isIdentifierChar(ch)) {
-        if (containsEsc) word += input.charAt(tokPos);
-        ++tokPos;
-      } else if (ch === 92) { // "\"
-        if (!containsEsc) word = input.slice(start, tokPos);
-        containsEsc = true;
-        if (input.charCodeAt(++tokPos) != 117) // "u"
-          raise(tokPos, "Expecting Unicode escape sequence \\uXXXX");
-        ++tokPos;
-        var esc = readHexChar(4);
-        var escStr = String.fromCharCode(esc);
-        if (!escStr) raise(tokPos - 1, "Invalid Unicode escape");
-        if (!(first ? isIdentifierStart(esc) : isIdentifierChar(esc)))
-          raise(tokPos - 4, "Invalid Unicode escape");
-        word += escStr;
-      } else {
-        break;
-      }
-      first = false;
-    }
-    return containsEsc ? word : input.slice(start, tokPos);
-  }
             		           
                               
                            
                                
               
Read an identifier or keyword token. Will check for reserved
-words when necessary.
             		                            
  function readWord() {
-    var word = readWord1();
-    var type = _name;
-    if (!containsEsc && isKeyword(word))
-      type = keywordTypes[word];
-    return finishToken(type, word);
-  }
             		           
                               
                            
                                
               
Parser
             		                            
             		           
                               
                            
                                
               
A recursive descent parser operates by defining functions for all
-syntactic elements, and recursively calling those, each function
-advancing the input stream and returning an AST node. Precedence
-of constructs (for example, the fact that !x[1] means !(x[1])
-instead of (!x)[1] is handled by the fact that the parser
-function that parses unary prefix operators is called first, and
-in turn calls the function that parses [] subscripts — that
-way, it'll receive the node for x[1] already parsed, and wraps
-that in the unary operator node.

-
-
Acorn uses an operator precedence parser to handle binary
-operator precedence, because it is much more compact than using
-the technique outlined above, which uses different, nesting
-functions to specify precedence, for all of the ten binary
-precedence levels that JavaScript defines.
             		                            
             		           
                               
                            
                                
               
Parser utilities
             		                            
             		           
                               
                            
                                
               
Continue to the next token.
             		                            
  function next() {
-    lastStart = tokStart;
-    lastEnd = tokEnd;
-    lastEndLoc = tokEndLoc;
-    readToken();
-  }
             		           
                               
                            
                                
               
Enter strict mode. Re-reads the next token to please pedantic
-tests ("use strict"; 010; -- should fail).
             		                            
  function setStrict(strct) {
-    strict = strct;
-    tokPos = tokStart;
-    if (options.locations) {
-      while (tokPos < tokLineStart) {
-        tokLineStart = input.lastIndexOf("\n", tokLineStart - 2) + 1;
-        --tokCurLine;
-      }
-    }
-    skipSpace();
-    readToken();
-  }
             		           
                               
                            
                                
               
Start an AST node, attaching a start offset.
             		                            
  function Node() {
-    this.type = null;
-    this.start = tokStart;
-    this.end = null;
-  }
-
-  exports.Node = Node;
-
-  function SourceLocation() {
-    this.start = tokStartLoc;
-    this.end = null;
-    if (sourceFile !== null) this.source = sourceFile;
-  }
-
-  function startNode() {
-    var node = new Node();
-    if (options.locations)
-      node.loc = new SourceLocation();
-    if (options.directSourceFile)
-      node.sourceFile = options.directSourceFile;
-    if (options.ranges)
-      node.range = [tokStart, 0];
-    return node;
-  }
             		           
                               
                            
                                
               
Start a node whose start offset information should be based on
-the start of another node. For example, a binary operator node is
-only started after its left-hand side has already been parsed.
             		                            
  function startNodeFrom(other) {
-    var node = new Node();
-    node.start = other.start;
-    if (options.locations) {
-      node.loc = new SourceLocation();
-      node.loc.start = other.loc.start;
-    }
-    if (options.ranges)
-      node.range = [other.range[0], 0];
-
-    return node;
-  }
             		           
                               
                            
                                
               
Finish an AST node, adding type and end properties.
             		                            
  function finishNode(node, type) {
-    node.type = type;
-    node.end = lastEnd;
-    if (options.locations)
-      node.loc.end = lastEndLoc;
-    if (options.ranges)
-      node.range[1] = lastEnd;
-    return node;
-  }
             		           
                               
                            
                                
               
Test whether a statement node is the string literal "use strict".
             		                            
  function isUseStrict(stmt) {
-    return options.ecmaVersion >= 5 && stmt.type === "ExpressionStatement" &&
-      stmt.expression.type === "Literal" && stmt.expression.value === "use strict";
-  }
             		           
                               
                            
                                
               
Predicate that tests whether the next token is of the given
-type, and if yes, consumes it as a side effect.
             		                            
  function eat(type) {
-    if (tokType === type) {
-      next();
-      return true;
-    } else {
-      return false;
-    }
-  }
             		           
                               
                            
                                
               
Test whether a semicolon can be inserted at the current position.
             		                            
  function canInsertSemicolon() {
-    return !options.strictSemicolons &&
-      (tokType === _eof || tokType === _braceR || newline.test(input.slice(lastEnd, tokStart)));
-  }
             		           
                               
                            
                                
               
Consume a semicolon, or, failing that, see if we are allowed to
-pretend that there is a semicolon at this position.
             		                            
  function semicolon() {
-    if (!eat(_semi) && !canInsertSemicolon()) unexpected();
-  }
             		           
                               
                            
                                
               
Expect a token of a given type. If found, consume it, otherwise,
-raise an unexpected token error.
             		                            
  function expect(type) {
-    eat(type) || unexpected();
-  }
             		           
                               
                            
                                
               
Raise an unexpected token error.
             		                            
  function unexpected(pos) {
-    raise(pos != null ? pos : tokStart, "Unexpected token");
-  }
             		           
                               
                            
                                
               
Checks if hash object has a property.
             		                            
  function has(obj, propName) {
-    return Object.prototype.hasOwnProperty.call(obj, propName);
-  }
             		           
                               
                            
                                
               
Convert existing expression atom to assignable pattern
-if possible.
             		                            
  function toAssignable(node, allowSpread, checkType) {
-    if (options.ecmaVersion >= 6 && node) {
-      switch (node.type) {
-        case "Identifier":
-        case "MemberExpression":
-          break;
-
-        case "ObjectExpression":
-          node.type = "ObjectPattern";
-          for (var i = 0; i < node.properties.length; i++) {
-            var prop = node.properties[i];
-            if (prop.kind !== "init") unexpected(prop.key.start);
-            toAssignable(prop.value, false, checkType);
-          }
-          break;
-
-        case "ArrayExpression":
-          node.type = "ArrayPattern";
-          for (var i = 0, lastI = node.elements.length - 1; i <= lastI; i++) {
-            toAssignable(node.elements[i], i === lastI, checkType);
-          }
-          break;
-
-        case "SpreadElement":
-          if (allowSpread) {
-            toAssignable(node.argument, false, checkType);
-            checkSpreadAssign(node.argument);
-          } else {
-            unexpected(node.start);
-          }
-          break;
-
-        default:
-          if (checkType) unexpected(node.start);
-      }
-    }
-    return node;
-  }
             		           
                               
                            
                                
               
Checks if node can be assignable spread argument.
             		                            
  function checkSpreadAssign(node) {
-    if (node.type !== "Identifier" && node.type !== "ArrayPattern")
-      unexpected(node.start);
-  }
             		           
                               
                            
                                
               
Verify that argument names are not repeated, and it does not
-try to bind the words eval or arguments.
             		                            
  function checkFunctionParam(param, nameHash) {
-    switch (param.type) {
-      case "Identifier":
-        if (isStrictReservedWord(param.name) || isStrictBadIdWord(param.name))
-          raise(param.start, "Defining '" + param.name + "' in strict mode");
-        if (has(nameHash, param.name))
-          raise(param.start, "Argument name clash in strict mode");
-        nameHash[param.name] = true;
-        break;
-
-      case "ObjectPattern":
-        for (var i = 0; i < param.properties.length; i++)
-          checkFunctionParam(param.properties[i].value, nameHash);
-        break;
-
-      case "ArrayPattern":
-        for (var i = 0; i < param.elements.length; i++)
-          checkFunctionParam(param.elements[i], nameHash);
-        break;
-    }
-  }
             		           
                               
                            
                                
               
Check if property name clashes with already added.
-Object/class getters and setters are not allowed to clash —
-either with each other or with an init property — and in
-strict mode, init properties are also not allowed to be repeated.
             		                            
  function checkPropClash(prop, propHash) {
-    if (prop.computed) return;
-    var key = prop.key, name;
-    switch (key.type) {
-      case "Identifier": name = key.name; break;
-      case "Literal": name = String(key.value); break;
-      default: return;
-    }
-    var kind = prop.kind || "init", other;
-    if (has(propHash, name)) {
-      other = propHash[name];
-      var isGetSet = kind !== "init";
-      if ((strict || isGetSet) && other[kind] || !(isGetSet ^ other.init))
-        raise(key.start, "Redefinition of property");
-    } else {
-      other = propHash[name] = {
-        init: false,
-        get: false,
-        set: false
-      };
-    }
-    other[kind] = true;
-  }
             		           
                               
                            
                                
               
Verify that a node is an lval — something that can be assigned
-to.
             		                            
  function checkLVal(expr, isBinding) {
-    switch (expr.type) {
-      case "Identifier":
-        if (strict && (isStrictBadIdWord(expr.name) || isStrictReservedWord(expr.name)))
-          raise(expr.start, isBinding
-            ? "Binding " + expr.name + " in strict mode"
-            : "Assigning to " + expr.name + " in strict mode"
-          );
-        break;
-
-      case "MemberExpression":
-        if (!isBinding) break;
-
-      case "ObjectPattern":
-        for (var i = 0; i < expr.properties.length; i++)
-          checkLVal(expr.properties[i].value, isBinding);
-        break;
-
-      case "ArrayPattern":
-        for (var i = 0; i < expr.elements.length; i++) {
-          var elem = expr.elements[i];
-          if (elem) checkLVal(elem, isBinding);
-        }
-        break;
-
-      case "SpreadElement":
-        break;
-
-      default:
-        raise(expr.start, "Assigning to rvalue");
-    }
-  }
             		           
                               
                            
                                
               
Statement parsing
             		                            
             		           
                               
                            
                                
               
Parse a program. Initializes the parser, reads any number of
-statements, and wraps them in a Program node.  Optionally takes a
-program argument.  If present, the statements will be appended
-to its body instead of creating a new node.
             		                            
  function parseTopLevel(program) {
-    lastStart = lastEnd = tokPos;
-    if (options.locations) lastEndLoc = new Position;
-    inFunction = inGenerator = strict = null;
-    labels = [];
-    readToken();
-
-    var node = program || startNode(), first = true;
-    if (!program) node.body = [];
-    while (tokType !== _eof) {
-      var stmt = parseStatement();
-      node.body.push(stmt);
-      if (first && isUseStrict(stmt)) setStrict(true);
-      first = false;
-    }
-    return finishNode(node, "Program");
-  }
-
-  var loopLabel = {kind: "loop"}, switchLabel = {kind: "switch"};
             		           
                               
                            
                                
               
Parse a single statement.

-
-
If expecting a statement and finding a slash operator, parse a
-regular expression literal. This is to handle cases like
-if (foo) /blah/.exec(foo);, where looking at the previous token
-does not help.
             		                            
  function parseStatement() {
-    if (tokType === _slash || tokType === _assign && tokVal == "/=")
-      readToken(true);
-
-    var starttype = tokType, node = startNode();
             		           
                               
                            
                                
               
Most types of statements are recognized by the keyword they
-start with. Many are trivial to parse, some require a bit of
-complexity.
             		                            
    switch (starttype) {
-    case _break: case _continue: return parseBreakContinueStatement(node, starttype.keyword);
-    case _debugger: return parseDebuggerStatement(node);
-    case _do: return parseDoStatement(node);
-    case _for: return parseForStatement(node);
-    case _function: return parseFunctionStatement(node);
-    case _class: return parseClass(node, true);
-    case _if: return parseIfStatement(node);
-    case _return: return parseReturnStatement(node);
-    case _switch: return parseSwitchStatement(node);
-    case _throw: return parseThrowStatement(node);
-    case _try: return parseTryStatement(node);
-    case _var: case _let: case _const: return parseVarStatement(node, starttype.keyword);
-    case _while: return parseWhileStatement(node);
-    case _with: return parseWithStatement(node);
-    case _braceL: return parseBlock(); // no point creating a function for this
-    case _semi: return parseEmptyStatement(node);
-    case _export: return parseExport(node);
-    case _import: return parseImport(node);
             		           
                               
                            
                                
               
If the statement does not start with a statement keyword or a
-brace, it's an ExpressionStatement or LabeledStatement. We
-simply start parsing an expression, and afterwards, if the
-next token is a colon and the expression was a simple
-Identifier node, we switch to interpreting it as a label.
             		                            
    default:
-      var maybeName = tokVal, expr = parseExpression();
-      if (starttype === _name && expr.type === "Identifier" && eat(_colon))
-        return parseLabeledStatement(node, maybeName, expr);
-      else return parseExpressionStatement(node, expr);
-    }
-  }
-
-  function parseBreakContinueStatement(node, keyword) {
-    var isBreak = keyword == "break";
-    next();
-    if (eat(_semi) || canInsertSemicolon()) node.label = null;
-    else if (tokType !== _name) unexpected();
-    else {
-      node.label = parseIdent();
-      semicolon();
-    }
             		           
                               
                            
                                
               
Verify that there is an actual destination to break or
-continue to.
             		                            
    for (var i = 0; i < labels.length; ++i) {
-      var lab = labels[i];
-      if (node.label == null || lab.name === node.label.name) {
-        if (lab.kind != null && (isBreak || lab.kind === "loop")) break;
-        if (node.label && isBreak) break;
-      }
-    }
-    if (i === labels.length) raise(node.start, "Unsyntactic " + keyword);
-    return finishNode(node, isBreak ? "BreakStatement" : "ContinueStatement");
-  }
-
-  function parseDebuggerStatement(node) {
-    next();
-    semicolon();
-    return finishNode(node, "DebuggerStatement");
-  }
-
-  function parseDoStatement(node) {
-    next();
-    labels.push(loopLabel);
-    node.body = parseStatement();
-    labels.pop();
-    expect(_while);
-    node.test = parseParenExpression();
-    semicolon();
-    return finishNode(node, "DoWhileStatement");
-  }
             		           
                               
                            
                                
               
Disambiguating between a for and a for/in or for/of
-loop is non-trivial. Basically, we have to parse the init var
-statement or expression, disallowing the in operator (see
-the second parameter to parseExpression), and then check
-whether the next token is in or of. When there is no init
-part (semicolon immediately after the opening parenthesis), it
-is a regular for loop.
             		                            
  function parseForStatement(node) {
-    next();
-    labels.push(loopLabel);
-    expect(_parenL);
-    if (tokType === _semi) return parseFor(node, null);
-    if (tokType === _var || tokType === _let) {
-      var init = startNode(), varKind = tokType.keyword, isLet = tokType === _let;
-      next();
-      parseVar(init, true, varKind);
-      finishNode(init, "VariableDeclaration");
-      if ((tokType === _in || (tokType === _name && tokVal === "of")) && init.declarations.length === 1 &&
-          !(isLet && init.declarations[0].init))
-        return parseForIn(node, init);
-      return parseFor(node, init);
-    }
-    var init = parseExpression(false, true);
-    if (tokType === _in || (tokType === _name && tokVal === "of")) {
-      checkLVal(init);
-      return parseForIn(node, init);
-    }
-    return parseFor(node, init);
-  }
-
-  function parseFunctionStatement(node) {
-    next();
-    return parseFunction(node, true);
-  }
-
-  function parseIfStatement(node) {
-    next();
-    node.test = parseParenExpression();
-    node.consequent = parseStatement();
-    node.alternate = eat(_else) ? parseStatement() : null;
-    return finishNode(node, "IfStatement");
-  }
-
-  function parseReturnStatement(node) {
-    if (!inFunction && !options.allowReturnOutsideFunction)
-      raise(tokStart, "'return' outside of function");
-    next();
             		           
                               
                            
                                
               
In return (and break/continue), the keywords with
-optional arguments, we eagerly look for a semicolon or the
-possibility to insert one.
             		                            
    if (eat(_semi) || canInsertSemicolon()) node.argument = null;
-    else { node.argument = parseExpression(); semicolon(); }
-    return finishNode(node, "ReturnStatement");
-  }
-
-  function parseSwitchStatement(node) {
-    next();
-    node.discriminant = parseParenExpression();
-    node.cases = [];
-    expect(_braceL);
-    labels.push(switchLabel);
             		           
                               
                            
                                
               
Statements under must be grouped (by label) in SwitchCase
-nodes. cur is used to keep the node that we are currently
-adding statements to.
             		                            
    for (var cur, sawDefault; tokType != _braceR;) {
-      if (tokType === _case || tokType === _default) {
-        var isCase = tokType === _case;
-        if (cur) finishNode(cur, "SwitchCase");
-        node.cases.push(cur = startNode());
-        cur.consequent = [];
-        next();
-        if (isCase) cur.test = parseExpression();
-        else {
-          if (sawDefault) raise(lastStart, "Multiple default clauses"); sawDefault = true;
-          cur.test = null;
-        }
-        expect(_colon);
-      } else {
-        if (!cur) unexpected();
-        cur.consequent.push(parseStatement());
-      }
-    }
-    if (cur) finishNode(cur, "SwitchCase");
-    next(); // Closing brace
-    labels.pop();
-    return finishNode(node, "SwitchStatement");
-  }
-
-  function parseThrowStatement(node) {
-    next();
-    if (newline.test(input.slice(lastEnd, tokStart)))
-      raise(lastEnd, "Illegal newline after throw");
-    node.argument = parseExpression();
-    semicolon();
-    return finishNode(node, "ThrowStatement");
-  }
-
-  function parseTryStatement(node) {
-    next();
-    node.block = parseBlock();
-    node.handler = null;
-    if (tokType === _catch) {
-      var clause = startNode();
-      next();
-      expect(_parenL);
-      clause.param = parseIdent();
-      if (strict && isStrictBadIdWord(clause.param.name))
-        raise(clause.param.start, "Binding " + clause.param.name + " in strict mode");
-      expect(_parenR);
-      clause.guard = null;
-      clause.body = parseBlock();
-      node.handler = finishNode(clause, "CatchClause");
-    }
-    node.guardedHandlers = empty;
-    node.finalizer = eat(_finally) ? parseBlock() : null;
-    if (!node.handler && !node.finalizer)
-      raise(node.start, "Missing catch or finally clause");
-    return finishNode(node, "TryStatement");
-  }
-
-  function parseVarStatement(node, kind) {
-    next();
-    parseVar(node, false, kind);
-    semicolon();
-    return finishNode(node, "VariableDeclaration");
-  }
-
-  function parseWhileStatement(node) {
-    next();
-    node.test = parseParenExpression();
-    labels.push(loopLabel);
-    node.body = parseStatement();
-    labels.pop();
-    return finishNode(node, "WhileStatement");
-  }
-
-  function parseWithStatement(node) {
-    if (strict) raise(tokStart, "'with' in strict mode");
-    next();
-    node.object = parseParenExpression();
-    node.body = parseStatement();
-    return finishNode(node, "WithStatement");
-  }
-
-  function parseEmptyStatement(node) {
-    next();
-    return finishNode(node, "EmptyStatement");
-  }
-
-  function parseLabeledStatement(node, maybeName, expr) {
-    for (var i = 0; i < labels.length; ++i)
-      if (labels[i].name === maybeName) raise(expr.start, "Label '" + maybeName + "' is already declared");
-    var kind = tokType.isLoop ? "loop" : tokType === _switch ? "switch" : null;
-    labels.push({name: maybeName, kind: kind});
-    node.body = parseStatement();
-    labels.pop();
-    node.label = expr;
-    return finishNode(node, "LabeledStatement");
-  }
-
-  function parseExpressionStatement(node, expr) {
-    node.expression = expr;
-    semicolon();
-    return finishNode(node, "ExpressionStatement");
-  }
             		           
                               
                            
                                
               
Used for constructs like switch and if that insist on
-parentheses around their expression.
             		                            
  function parseParenExpression() {
-    expect(_parenL);
-    var val = parseExpression();
-    expect(_parenR);
-    return val;
-  }
             		           
                               
                            
                                
               
Parse a semicolon-enclosed block of statements, handling "use
-strict" declarations when allowStrict is true (used for
-function bodies).
             		                            
  function parseBlock(allowStrict) {
-    var node = startNode(), first = true, strict = false, oldStrict;
-    node.body = [];
-    expect(_braceL);
-    while (!eat(_braceR)) {
-      var stmt = parseStatement();
-      node.body.push(stmt);
-      if (first && allowStrict && isUseStrict(stmt)) {
-        oldStrict = strict;
-        setStrict(strict = true);
-      }
-      first = false;
-    }
-    if (strict && !oldStrict) setStrict(false);
-    return finishNode(node, "BlockStatement");
-  }
             		           
                               
                            
                                
               
Parse a regular for loop. The disambiguation code in
-parseStatement will already have parsed the init statement or
-expression.
             		                            
  function parseFor(node, init) {
-    node.init = init;
-    expect(_semi);
-    node.test = tokType === _semi ? null : parseExpression();
-    expect(_semi);
-    node.update = tokType === _parenR ? null : parseExpression();
-    expect(_parenR);
-    node.body = parseStatement();
-    labels.pop();
-    return finishNode(node, "ForStatement");
-  }
             		           
                               
                            
                                
               
Parse a for/in and for/of loop, which are almost
-same from parser's perspective.
             		                            
  function parseForIn(node, init) {
-    var type = tokType === _in ? "ForInStatement" : "ForOfStatement";
-    next();
-    node.left = init;
-    node.right = parseExpression();
-    expect(_parenR);
-    node.body = parseStatement();
-    labels.pop();
-    return finishNode(node, type);
-  }
             		           
                               
                            
                                
               
Parse a list of variable declarations.
             		                            
  function parseVar(node, noIn, kind) {
-    node.declarations = [];
-    node.kind = kind;
-    for (;;) {
-      var decl = startNode();
-      decl.id = options.ecmaVersion >= 6 ? toAssignable(parseExprAtom()) : parseIdent();
-      checkLVal(decl.id, true);
-      decl.init = eat(_eq) ? parseExpression(true, noIn) : (kind === _const.keyword ? unexpected() : null);
-      node.declarations.push(finishNode(decl, "VariableDeclarator"));
-      if (!eat(_comma)) break;
-    }
-    return node;
-  }
             		           
                               
                            
                                
               
Expression parsing
             		                            
             		           
                               
                            
                                
               
These nest, from the most general expression type at the top to
-'atomic', nondivisible expression types at the bottom. Most of
-the functions will simply let the function(s) below them parse,
-and, if the syntactic construct they handle is present, wrap
-the AST node that the inner parser gave them in another node.
             		                            
             		           
                               
                            
                                
               
Parse a full expression. The arguments are used to forbid comma
-sequences (in argument lists, array literals, or object literals)
-or the in operator (in for loops initalization expressions).
             		                            
  function parseExpression(noComma, noIn) {
-    var expr = parseMaybeAssign(noIn);
-    if (!noComma && tokType === _comma) {
-      var node = startNodeFrom(expr);
-      node.expressions = [expr];
-      while (eat(_comma)) node.expressions.push(parseMaybeAssign(noIn));
-      return finishNode(node, "SequenceExpression");
-    }
-    return expr;
-  }
             		           
                               
                            
                                
               
Parse an assignment expression. This includes applications of
-operators like +=.
             		                            
  function parseMaybeAssign(noIn) {
-    var left = parseMaybeConditional(noIn);
-    if (tokType.isAssign) {
-      var node = startNodeFrom(left);
-      node.operator = tokVal;
-      node.left = tokType === _eq ? toAssignable(left) : left;
-      checkLVal(left);
-      next();
-      node.right = parseMaybeAssign(noIn);
-      return finishNode(node, "AssignmentExpression");
-    }
-    return left;
-  }
             		           
                               
                            
                                
               
Parse a ternary conditional (?:) operator.
             		                            
  function parseMaybeConditional(noIn) {
-    var expr = parseExprOps(noIn);
-    if (eat(_question)) {
-      var node = startNodeFrom(expr);
-      node.test = expr;
-      node.consequent = parseExpression(true);
-      expect(_colon);
-      node.alternate = parseExpression(true, noIn);
-      return finishNode(node, "ConditionalExpression");
-    }
-    return expr;
-  }
             		           
                               
                            
                                
               
Start the precedence parser.
             		                            
  function parseExprOps(noIn) {
-    return parseExprOp(parseMaybeUnary(), -1, noIn);
-  }
             		           
                               
                            
                                
               
Parse binary operators with the operator precedence parsing
-algorithm. left is the left-hand side of the operator.
-minPrec provides context that allows the function to stop and
-defer further parser to one of its callers when it encounters an
-operator that has a lower precedence than the set it is parsing.
             		                            
  function parseExprOp(left, minPrec, noIn) {
-    var prec = tokType.binop;
-    if (prec != null && (!noIn || tokType !== _in)) {
-      if (prec > minPrec) {
-        var node = startNodeFrom(left);
-        node.left = left;
-        node.operator = tokVal;
-        var op = tokType;
-        next();
-        node.right = parseExprOp(parseMaybeUnary(), prec, noIn);
-        var exprNode = finishNode(node, (op === _logicalOR || op === _logicalAND) ? "LogicalExpression" : "BinaryExpression");
-        return parseExprOp(exprNode, minPrec, noIn);
-      }
-    }
-    return left;
-  }
             		           
                               
                            
                                
               
Parse unary operators, both prefix and postfix.
             		                            
  function parseMaybeUnary() {
-    if (tokType.prefix) {
-      var node = startNode(), update = tokType.isUpdate;
-      node.operator = tokVal;
-      node.prefix = true;
-      tokRegexpAllowed = true;
-      next();
-      node.argument = parseMaybeUnary();
-      if (update) checkLVal(node.argument);
-      else if (strict && node.operator === "delete" &&
-               node.argument.type === "Identifier")
-        raise(node.start, "Deleting local variable in strict mode");
-      return finishNode(node, update ? "UpdateExpression" : "UnaryExpression");
-    }
-    var expr = parseExprSubscripts();
-    while (tokType.postfix && !canInsertSemicolon()) {
-      var node = startNodeFrom(expr);
-      node.operator = tokVal;
-      node.prefix = false;
-      node.argument = expr;
-      checkLVal(expr);
-      next();
-      expr = finishNode(node, "UpdateExpression");
-    }
-    return expr;
-  }
             		           
                               
                            
                                
               
Parse call, dot, and []-subscript expressions.
             		                            
  function parseExprSubscripts() {
-    return parseSubscripts(parseExprAtom());
-  }
-
-  function parseSubscripts(base, noCalls) {
-    if (eat(_dot)) {
-      var node = startNodeFrom(base);
-      node.object = base;
-      node.property = parseIdent(true);
-      node.computed = false;
-      return parseSubscripts(finishNode(node, "MemberExpression"), noCalls);
-    } else if (eat(_bracketL)) {
-      var node = startNodeFrom(base);
-      node.object = base;
-      node.property = parseExpression();
-      node.computed = true;
-      expect(_bracketR);
-      return parseSubscripts(finishNode(node, "MemberExpression"), noCalls);
-    } else if (!noCalls && eat(_parenL)) {
-      var node = startNodeFrom(base);
-      node.callee = base;
-      node.arguments = parseExprList(_parenR, false);
-      return parseSubscripts(finishNode(node, "CallExpression"), noCalls);
-    } else if (tokType === _bquote) {
-      var node = startNodeFrom(base);
-      node.tag = base;
-      node.quasi = parseTemplate();
-      return parseSubscripts(finishNode(node, "TaggedTemplateExpression"), noCalls);
-    } return base;
-  }
             		           
                               
                            
                                
               
Parse an atomic expression — either a single token that is an
-expression, an expression started by a keyword like function or
-new, or an expression wrapped in punctuation like (), [],
-or {}.
             		                            
  function parseExprAtom() {
-    switch (tokType) {
-    case _this:
-      var node = startNode();
-      next();
-      return finishNode(node, "ThisExpression");
-
-    case _yield:
-      if (inGenerator) return parseYield();
-
-    case _name:
-      var id = parseIdent(tokType !== _name);
-      if (eat(_arrow)) {
-        return parseArrowExpression(startNodeFrom(id), [id]);
-      }
-      return id;
-
-    case _num: case _string: case _regexp:
-      var node = startNode();
-      node.value = tokVal;
-      node.raw = input.slice(tokStart, tokEnd);
-      next();
-      return finishNode(node, "Literal");
-
-    case _null: case _true: case _false:
-      var node = startNode();
-      node.value = tokType.atomValue;
-      node.raw = tokType.keyword;
-      next();
-      return finishNode(node, "Literal");
-
-    case _parenL:
-      var tokStartLoc1 = tokStartLoc, tokStart1 = tokStart, val, exprList;
-      next();
             		           
                               
                            
                                
               
check whether this is generator comprehension or regular expression
             		                            
      if (options.ecmaVersion >= 6 && tokType === _for) {
-        val = parseComprehension(startNode(), true);
-      } else {
-        var oldParenL = ++metParenL;
-        if (tokType !== _parenR) {
-          val = parseExpression();
-          exprList = val.type === "SequenceExpression" ? val.expressions : [val];
-        } else {
-          exprList = [];
-        }
-        expect(_parenR);
             		           
                               
                            
                                
               
if '=>' follows '(...)', convert contents to arguments
             		                            
        if (metParenL === oldParenL && eat(_arrow)) {
-          val = parseArrowExpression(startNode(), exprList);
-        } else {
             		           
                               
                            
                                
               
forbid '()' before everything but '=>'
             		                            
          if (!val) unexpected(lastStart);
             		           
                               
                            
                                
               
forbid '...' in sequence expressions
             		                            
          if (options.ecmaVersion >= 6) {
-            for (var i = 0; i < exprList.length; i++) {
-              if (exprList[i].type === "SpreadElement") unexpected();
-            }
-          }
-        }
-      }
-      val.start = tokStart1;
-      val.end = lastEnd;
-      if (options.locations) {
-        val.loc.start = tokStartLoc1;
-        val.loc.end = lastEndLoc;
-      }
-      if (options.ranges) {
-        val.range = [tokStart1, lastEnd];
-      }
-      return val;
-
-    case _bracketL:
-      var node = startNode();
-      next();
             		           
                               
                            
                                
               
check whether this is array comprehension or regular array
             		                            
      if (options.ecmaVersion >= 6 && tokType === _for) {
-        return parseComprehension(node, false);
-      }
-      node.elements = parseExprList(_bracketR, true, true);
-      return finishNode(node, "ArrayExpression");
-
-    case _braceL:
-      return parseObj();
-
-    case _function:
-      var node = startNode();
-      next();
-      return parseFunction(node, false);
-
-    case _class:
-      return parseClass(startNode(), false);
-
-    case _new:
-      return parseNew();
-
-    case _ellipsis:
-      return parseSpread();
-
-    case _bquote:
-      return parseTemplate();
-
-    default:
-      unexpected();
-    }
-  }
             		           
                               
                            
                                
               
New's precedence is slightly tricky. It must allow its argument
-to be a [] or dot subscript expression, but not a call — at
-least, not without wrapping it in parentheses. Thus, it uses the
             		                            
  function parseNew() {
-    var node = startNode();
-    next();
-    node.callee = parseSubscripts(parseExprAtom(), true);
-    if (eat(_parenL)) node.arguments = parseExprList(_parenR, false);
-    else node.arguments = empty;
-    return finishNode(node, "NewExpression");
-  }
             		           
                               
                            
                                
               
Parse spread element '...expr'
             		                            
  function parseSpread() {
-    var node = startNode();
-    next();
-    node.argument = parseExpression(true);
-    return finishNode(node, "SpreadElement");
-  }
             		           
                               
                            
                                
               
Parse template expression.
             		                            
  function parseTemplate() {
-    var node = startNode();
-    node.expressions = [];
-    node.quasis = [];
-    inTemplate = true;
-    next();
-    for (;;) {
-      var elem = startNode();
-      elem.value = {cooked: tokVal, raw: input.slice(tokStart, tokEnd)};
-      elem.tail = false;
-      next();
-      node.quasis.push(finishNode(elem, "TemplateElement"));
-      if (eat(_bquote)) { // '`', end of template
-        elem.tail = true;
-        break;
-      }
-      inTemplate = false;
-      expect(_dollarBraceL);
-      node.expressions.push(parseExpression());
-      inTemplate = true;
-      expect(_braceR);
-    }
-    inTemplate = false;
-    return finishNode(node, "TemplateLiteral");
-  }
             		           
                               
                            
                                
               
Parse an object literal.
             		                            
  function parseObj() {
-    var node = startNode(), first = true, propHash = {};
-    node.properties = [];
-    next();
-    while (!eat(_braceR)) {
-      if (!first) {
-        expect(_comma);
-        if (options.allowTrailingCommas && eat(_braceR)) break;
-      } else first = false;
-
-      var prop = startNode(), isGenerator;
-      if (options.ecmaVersion >= 6) {
-        prop.method = false;
-        prop.shorthand = false;
-        isGenerator = eat(_star);
-      }
-      parsePropertyName(prop);
-      if (eat(_colon)) {
-        prop.value = parseExpression(true);
-        prop.kind = "init";
-      } else if (options.ecmaVersion >= 6 && tokType === _parenL) {
-        prop.kind = "init";
-        prop.method = true;
-        prop.value = parseMethod(isGenerator);
-      } else if (options.ecmaVersion >= 5 && !prop.computed && prop.key.type === "Identifier" &&
-                 (prop.key.name === "get" || prop.key.name === "set")) {
-        if (isGenerator) unexpected();
-        prop.kind = prop.key.name;
-        parsePropertyName(prop);
-        prop.value = parseMethod(false);
-      } else if (options.ecmaVersion >= 6 && !prop.computed && prop.key.type === "Identifier") {
-        prop.kind = "init";
-        prop.value = prop.key;
-        prop.shorthand = true;
-      } else unexpected();
-
-      checkPropClash(prop, propHash);
-      node.properties.push(finishNode(prop, "Property"));
-    }
-    return finishNode(node, "ObjectExpression");
-  }
-
-  function parsePropertyName(prop) {
-    if (options.ecmaVersion >= 6) {
-      if (eat(_bracketL)) {
-        prop.computed = true;
-        prop.key = parseExpression();
-        expect(_bracketR);
-        return;
-      } else {
-        prop.computed = false;
-      }
-    }
-    prop.key = (tokType === _num || tokType === _string) ? parseExprAtom() : parseIdent(true);
-  }
             		           
                               
                            
                                
               
Initialize empty function node.
             		                            
  function initFunction(node) {
-    node.id = null;
-    node.params = [];
-    if (options.ecmaVersion >= 6) {
-      node.defaults = [];
-      node.rest = null;
-      node.generator = false;
-    }
-  }
             		           
                               
                            
                                
               
Parse a function declaration or literal (depending on the
-isStatement parameter).
             		                            
  function parseFunction(node, isStatement, allowExpressionBody) {
-    initFunction(node);
-    if (options.ecmaVersion >= 6) {
-      node.generator = eat(_star);
-    }
-    if (isStatement || tokType === _name) {
-      node.id = parseIdent();
-    }
-    parseFunctionParams(node);
-    parseFunctionBody(node, allowExpressionBody);
-    return finishNode(node, isStatement ? "FunctionDeclaration" : "FunctionExpression");
-  }
             		           
                               
                            
                                
               
Parse object or class method.
             		                            
  function parseMethod(isGenerator) {
-    var node = startNode();
-    initFunction(node);
-    parseFunctionParams(node);
-    var allowExpressionBody;
-    if (options.ecmaVersion >= 6) {
-      node.generator = isGenerator;
-      allowExpressionBody = true;
-    } else {
-      allowExpressionBody = false;
-    }
-    parseFunctionBody(node, allowExpressionBody);
-    return finishNode(node, "FunctionExpression");
-  }
             		           
                               
                            
                                
               
Parse arrow function expression with given parameters.
             		                            
  function parseArrowExpression(node, params) {
-    initFunction(node);
-
-    var defaults = node.defaults, hasDefaults = false;
-
-    for (var i = 0, lastI = params.length - 1; i <= lastI; i++) {
-      var param = params[i];
-
-      if (param.type === "AssignmentExpression" && param.operator === "=") {
-        hasDefaults = true;
-        params[i] = param.left;
-        defaults.push(param.right);
-      } else {
-        toAssignable(param, i === lastI, true);
-        defaults.push(null);
-        if (param.type === "SpreadElement") {
-          params.length--;
-          node.rest = param.argument;
-          break;
-        }
-      }
-    }
-
-    node.params = params;
-    if (!hasDefaults) node.defaults = [];
-
-    parseFunctionBody(node, true);
-    return finishNode(node, "ArrowFunctionExpression");
-  }
             		           
                               
                            
                                
               
Parse function parameters.
             		                            
  function parseFunctionParams(node) {
-    var defaults = [], hasDefaults = false;
-
-    expect(_parenL);
-    for (;;) {
-      if (eat(_parenR)) {
-        break;
-      } else if (options.ecmaVersion >= 6 && eat(_ellipsis)) {
-        node.rest = toAssignable(parseExprAtom(), false, true);
-        checkSpreadAssign(node.rest);
-        expect(_parenR);
-        break;
-      } else {
-        node.params.push(options.ecmaVersion >= 6 ? toAssignable(parseExprAtom(), false, true) : parseIdent());
-        if (options.ecmaVersion >= 6 && tokType === _eq) {
-          next();
-          hasDefaults = true;
-          defaults.push(parseExpression(true));
-        }
-        if (!eat(_comma)) {
-          expect(_parenR);
-          break;
-        }
-      }
-    }
-
-    if (hasDefaults) node.defaults = defaults;
-  }
             		           
                               
                            
                                
               
Parse function body and check parameters.
             		                            
  function parseFunctionBody(node, allowExpression) {
-    var isExpression = allowExpression && tokType !== _braceL;
-
-    if (isExpression) {
-      node.body = parseExpression(true);
-      node.expression = true;
-    } else {
             		           
                               
                            
                                
               
Start a new scope with regard to labels and the inFunction
-flag (restore them to their old value afterwards).
             		                            
      var oldInFunc = inFunction, oldInGen = inGenerator, oldLabels = labels;
-      inFunction = true; inGenerator = node.generator; labels = [];
-      node.body = parseBlock(true);
-      node.expression = false;
-      inFunction = oldInFunc; inGenerator = oldInGen; labels = oldLabels;
-    }
             		           
                               
                            
                                
               
If this is a strict mode function, verify that argument names
-are not repeated, and it does not try to bind the words eval
-or arguments.
             		                            
    if (strict || !isExpression && node.body.body.length && isUseStrict(node.body.body[0])) {
-      var nameHash = {};
-      if (node.id)
-        checkFunctionParam(node.id, {});
-      for (var i = 0; i < node.params.length; i++)
-        checkFunctionParam(node.params[i], nameHash);
-      if (node.rest)
-        checkFunctionParam(node.rest, nameHash);
-    }
-  }
             		           
                               
                            
                                
               
Parse a class declaration or literal (depending on the
-isStatement parameter).
             		                            
  function parseClass(node, isStatement) {
-    next();
-    node.id = tokType === _name ? parseIdent() : isStatement ? unexpected() : null;
-    node.superClass = eat(_extends) ? parseExpression() : null;
-    var classBody = startNode(), methodHash = {}, staticMethodHash = {};
-    classBody.body = [];
-    expect(_braceL);
-    while (!eat(_braceR)) {
-      var method = startNode();
-      if (tokType === _name && tokVal === "static") {
-        next();
-        method['static'] = true;
-      } else {
-        method['static'] = false;
-      }
-      var isGenerator = eat(_star);
-      parsePropertyName(method);
-      if (tokType === _name && !method.computed && method.key.type === "Identifier" &&
-          (method.key.name === "get" || method.key.name === "set")) {
-        if (isGenerator) unexpected();
-        method.kind = method.key.name;
-        parsePropertyName(method);
-      } else {
-        method.kind = "";
-      }
-      method.value = parseMethod(isGenerator);
-      checkPropClash(method, method['static'] ? staticMethodHash : methodHash);
-      classBody.body.push(finishNode(method, "MethodDefinition"));
-      eat(_semi);
-    }
-    node.body = finishNode(classBody, "ClassBody");
-    return finishNode(node, isStatement ? "ClassDeclaration" : "ClassExpression");
-  }
             		           
                               
                            
                                
               
Parses a comma-separated list of expressions, and returns them as
-an array. close is the token type that ends the list, and
-allowEmpty can be turned on to allow subsequent commas with
-nothing in between them to be parsed as null (which is needed
-for array literals).
             		                            
  function parseExprList(close, allowTrailingComma, allowEmpty) {
-    var elts = [], first = true;
-    while (!eat(close)) {
-      if (!first) {
-        expect(_comma);
-        if (allowTrailingComma && options.allowTrailingCommas && eat(close)) break;
-      } else first = false;
-
-      if (allowEmpty && tokType === _comma) elts.push(null);
-      else elts.push(parseExpression(true));
-    }
-    return elts;
-  }
             		           
                               
                            
                                
               
Parse the next token as an identifier. If liberal is true (used
-when parsing properties), it will also convert keywords into
-identifiers.
             		                            
  function parseIdent(liberal) {
-    var node = startNode();
-    if (liberal && options.forbidReserved == "everywhere") liberal = false;
-    if (tokType === _name) {
-      if (!liberal &&
-          (options.forbidReserved &&
-           (options.ecmaVersion === 3 ? isReservedWord3 : isReservedWord5)(tokVal) ||
-           strict && isStrictReservedWord(tokVal)) &&
-          input.slice(tokStart, tokEnd).indexOf("\\") == -1)
-        raise(tokStart, "The keyword '" + tokVal + "' is reserved");
-      node.name = tokVal;
-    } else if (liberal && tokType.keyword) {
-      node.name = tokType.keyword;
-    } else {
-      unexpected();
-    }
-    tokRegexpAllowed = false;
-    next();
-    return finishNode(node, "Identifier");
-  }
             		           
                               
                            
                                
               
Parses module export declaration.
             		                            
  function parseExport(node) {
-    next();
             		           
                               
                            
                                
               
export var|const|let|function|class ...;
             		                            
    if (tokType === _var || tokType === _const || tokType === _let || tokType === _function || tokType === _class) {
-      node.declaration = parseStatement();
-      node['default'] = false;
-      node.specifiers = null;
-      node.source = null;
-    } else
             		           
                               
                            
                                
               
export default ...;
             		                            
    if (eat(_default)) {
-      node.declaration = parseExpression(true);
-      node['default'] = true;
-      node.specifiers = null;
-      node.source = null;
-      semicolon();
-    } else {
             		           
                               
                            
                                
               
export * from '...'
-export { x, y as z } [from '...']
             		                            
      var isBatch = tokType === _star;
-      node.declaration = null;
-      node['default'] = false;
-      node.specifiers = parseExportSpecifiers();
-      if (tokType === _name && tokVal === "from") {
-        next();
-        node.source = tokType === _string ? parseExprAtom() : unexpected();
-      } else {
-        if (isBatch) unexpected();
-        node.source = null;
-      }
-    }
-    return finishNode(node, "ExportDeclaration");
-  }
             		           
                               
                            
                                
               
Parses a comma-separated list of module exports.
             		                            
  function parseExportSpecifiers() {
-    var nodes = [], first = true;
-    if (tokType === _star) {
             		           
                               
                            
                                
               
export * from '...'
             		                            
      var node = startNode();
-      next();
-      nodes.push(finishNode(node, "ExportBatchSpecifier"));
-    } else {
             		           
                               
                            
                                
               
export { x, y as z } [from '...']
             		                            
      expect(_braceL);
-      while (!eat(_braceR)) {
-        if (!first) {
-          expect(_comma);
-          if (options.allowTrailingCommas && eat(_braceR)) break;
-        } else first = false;
-
-        var node = startNode();
-        node.id = parseIdent();
-        if (tokType === _name && tokVal === "as") {
-          next();
-          node.name = parseIdent(true);
-        } else {
-          node.name = null;
-        }
-        nodes.push(finishNode(node, "ExportSpecifier"));
-      }
-    }
-    return nodes;
-  }
             		           
                               
                            
                                
               
Parses import declaration.
             		                            
  function parseImport(node) {
-    next();
             		           
                               
                            
                                
               
import '...';
             		                            
    if (tokType === _string) {
-      node.specifiers = [];
-      node.source = parseExprAtom();
-      node.kind = "";
-    } else {
-      node.specifiers = parseImportSpecifiers();
-      if (tokType !== _name || tokVal !== "from") unexpected();
-      next();
-      node.source = tokType === _string ? parseExprAtom() : unexpected();
             		           
                               
                            
                                
               
only for backward compatibility with Esprima's AST
-(it doesn't support mixed default + named yet)
             		                            
      node.kind = node.specifiers[0]['default'] ? "default" : "named";
-    }
-    return finishNode(node, "ImportDeclaration");
-  }
             		           
                               
                            
                                
               
Parses a comma-separated list of module imports.
             		                            
  function parseImportSpecifiers() {
-    var nodes = [], first = true;
-    if (tokType === _star) {
-      var node = startNode();
-      next();
-      if (tokType !== _name || tokVal !== "as") unexpected();
-      next();
-      node.name = parseIdent();
-      checkLVal(node.name, true);
-      nodes.push(finishNode(node, "ImportBatchSpecifier"));
-      return nodes;
-    }
-    if (tokType === _name) {
             		           
                               
                            
                                
               
import defaultObj, { x, y as z } from '...'
             		                            
      var node = startNode();
-      node.id = parseIdent();
-      checkLVal(node.id, true);
-      node.name = null;
-      node['default'] = true;
-      nodes.push(finishNode(node, "ImportSpecifier"));
-      if (!eat(_comma)) return nodes;
-    }
-    expect(_braceL);
-    while (!eat(_braceR)) {
-      if (!first) {
-        expect(_comma);
-        if (options.allowTrailingCommas && eat(_braceR)) break;
-      } else first = false;
-
-      var node = startNode();
-      node.id = parseIdent(true);
-      if (tokType === _name && tokVal === "as") {
-        next();
-        node.name = parseIdent();
-      } else {
-        node.name = null;
-      }
-      checkLVal(node.name || node.id, true);
-      node['default'] = false;
-      nodes.push(finishNode(node, "ImportSpecifier"));
-    }
-    return nodes;
-  }
             		           
                               
                            
                                
               
Parses yield expression inside generator.
             		                            
  function parseYield() {
-    var node = startNode();
-    next();
-    if (eat(_semi) || canInsertSemicolon()) {
-      node.delegate = false;
-      node.argument = null;
-    } else {
-      node.delegate = eat(_star);
-      node.argument = parseExpression(true);
-    }
-    return finishNode(node, "YieldExpression");
-  }
             		           
                               
                            
                                
               
Parses array and generator comprehensions.
             		                            
  function parseComprehension(node, isGenerator) {
-    node.blocks = [];
-    while (tokType === _for) {
-      var block = startNode();
-      next();
-      expect(_parenL);
-      block.left = toAssignable(parseExprAtom());
-      checkLVal(block.left, true);
-      if (tokType !== _name || tokVal !== "of") unexpected();
-      next();
             		           
                               
                            
                                
               
of property is here for compatibility with Esprima's AST
-which also supports deprecated [for (... in ...) expr]
             		                            
      block.of = true;
-      block.right = parseExpression();
-      expect(_parenR);
-      node.blocks.push(finishNode(block, "ComprehensionBlock"));
-    }
-    node.filter = eat(_if) ? parseParenExpression() : null;
-    node.body = parseExpression();
-    expect(isGenerator ? _parenR : _bracketR);
-    node.generator = isGenerator;
-    return finishNode(node, "ComprehensionExpression");
-  }
-
-});
-
-
             		           
                     
   
   
\ No newline at end of file