text: (function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.acorn = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(_dereq_,module,exports){
  // 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][opp] 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.
  //
  // [opp]: http://en.wikipedia.org/wiki/Operator-precedence_parser
  
  "use strict";
  
  var _tokentype = _dereq_("./tokentype");
  
  var _state = _dereq_("./state");
  
  var _parseutil = _dereq_("./parseutil");
  
  var pp = _state.Parser.prototype;
  
  // 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.
  
  pp.checkPropClash = function (prop, propHash) {
    if (this.options.ecmaVersion >= 6 && (prop.computed || prop.method || prop.shorthand)) return;
    var key = prop.key;var name = undefined;
    switch (key.type) {
      case "Identifier":
        name = key.name;break;
      case "Literal":
        name = String(key.value);break;
      default:
        return;
    }
    var kind = prop.kind;
  
    if (this.options.ecmaVersion >= 6) {
      if (name === "__proto__" && kind === "init") {
        if (propHash.proto) this.raiseRecoverable(key.start, "Redefinition of __proto__ property");
        propHash.proto = true;
      }
      return;
    }
    name = "$" + name;
    var other = propHash[name];
    if (other) {
      var isGetSet = kind !== "init";
      if ((this.strict || isGetSet) && other[kind] || !(isGetSet ^ other.init)) this.raiseRecoverable(key.start, "Redefinition of property");
    } else {
      other = propHash[name] = {
        init: false,
        get: false,
        set: false
      };
    }
    other[kind] = true;
  };
  
  // ### 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 optional arguments are used to
  // forbid the `in` operator (in for loops initalization expressions)
  // and provide reference for storing '=' operator inside shorthand
  // property assignment in contexts where both object expression
  // and object pattern might appear (so it's possible to raise
  // delayed syntax error at correct position).
  
  pp.parseExpression = function (noIn, refDestructuringErrors) {
    var startPos = this.start,
        startLoc = this.startLoc;
    var expr = this.parseMaybeAssign(noIn, refDestructuringErrors);
    if (this.type === _tokentype.types.comma) {
      var node = this.startNodeAt(startPos, startLoc);
      node.expressions = [expr];
      while (this.eat(_tokentype.types.comma)) node.expressions.push(this.parseMaybeAssign(noIn, refDestructuringErrors));
      return this.finishNode(node, "SequenceExpression");
    }
    return expr;
  };
  
  // Parse an assignment expression. This includes applications of
  // operators like `+=`.
  
  pp.parseMaybeAssign = function (noIn, refDestructuringErrors, afterLeftParse) {
    if (this.inGenerator && this.isContextual("yield")) return this.parseYield();
  
    var ownDestructuringErrors = false;
    if (!refDestructuringErrors) {
      refDestructuringErrors = new _parseutil.DestructuringErrors();
      ownDestructuringErrors = true;
    }
    var startPos = this.start,
        startLoc = this.startLoc;
    if (this.type == _tokentype.types.parenL || this.type == _tokentype.types.name) this.potentialArrowAt = this.start;
    var left = this.parseMaybeConditional(noIn, refDestructuringErrors);
    if (afterLeftParse) left = afterLeftParse.call(this, left, startPos, startLoc);
    if (this.type.isAssign) {
      this.checkPatternErrors(refDestructuringErrors, true);
      if (!ownDestructuringErrors) _parseutil.DestructuringErrors.call(refDestructuringErrors);
      var node = this.startNodeAt(startPos, startLoc);
      node.operator = this.value;
      node.left = this.type === _tokentype.types.eq ? this.toAssignable(left) : left;
      refDestructuringErrors.shorthandAssign = 0; // reset because shorthand default was used correctly
      this.checkLVal(left);
      this.next();
      node.right = this.parseMaybeAssign(noIn);
      return this.finishNode(node, "AssignmentExpression");
    } else {
      if (ownDestructuringErrors) this.checkExpressionErrors(refDestructuringErrors, true);
    }
    return left;
  };
  
  // Parse a ternary conditional (`?:`) operator.
  
  pp.parseMaybeConditional = function (noIn, refDestructuringErrors) {
    var startPos = this.start,
        startLoc = this.startLoc;
    var expr = this.parseExprOps(noIn, refDestructuringErrors);
    if (this.checkExpressionErrors(refDestructuringErrors)) return expr;
    if (this.eat(_tokentype.types.question)) {
      var node = this.startNodeAt(startPos, startLoc);
      node.test = expr;
      node.consequent = this.parseMaybeAssign();
      this.expect(_tokentype.types.colon);
      node.alternate = this.parseMaybeAssign(noIn);
      return this.finishNode(node, "ConditionalExpression");
    }
    return expr;
  };
  
  // Start the precedence parser.
  
  pp.parseExprOps = function (noIn, refDestructuringErrors) {
    var startPos = this.start,
        startLoc = this.startLoc;
    var expr = this.parseMaybeUnary(refDestructuringErrors, false);
    if (this.checkExpressionErrors(refDestructuringErrors)) return expr;
    return this.parseExprOp(expr, startPos, startLoc, -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.
  
  pp.parseExprOp = function (left, leftStartPos, leftStartLoc, minPrec, noIn) {
    var prec = this.type.binop;
    if (prec != null && (!noIn || this.type !== _tokentype.types._in)) {
      if (prec > minPrec) {
        var logical = this.type === _tokentype.types.logicalOR || this.type === _tokentype.types.logicalAND;
        var op = this.value;
        this.next();
        var startPos = this.start,
            startLoc = this.startLoc;
        var right = this.parseExprOp(this.parseMaybeUnary(null, false), startPos, startLoc, prec, noIn);
        var node = this.buildBinary(leftStartPos, leftStartLoc, left, right, op, logical);
        return this.parseExprOp(node, leftStartPos, leftStartLoc, minPrec, noIn);
      }
    }
    return left;
  };
  
  pp.buildBinary = function (startPos, startLoc, left, right, op, logical) {
    var node = this.startNodeAt(startPos, startLoc);
    node.left = left;
    node.operator = op;
    node.right = right;
    return this.finishNode(node, logical ? "LogicalExpression" : "BinaryExpression");
  };
  
  // Parse unary operators, both prefix and postfix.
  
  pp.parseMaybeUnary = function (refDestructuringErrors, sawUnary) {
    var startPos = this.start,
        startLoc = this.startLoc,
        expr = undefined;
    if (this.type.prefix) {
      var node = this.startNode(),
          update = this.type === _tokentype.types.incDec;
      node.operator = this.value;
      node.prefix = true;
      this.next();
      node.argument = this.parseMaybeUnary(null, true);
      this.checkExpressionErrors(refDestructuringErrors, true);
      if (update) this.checkLVal(node.argument);else if (this.strict && node.operator === "delete" && node.argument.type === "Identifier") this.raiseRecoverable(node.start, "Deleting local variable in strict mode");else sawUnary = true;
      expr = this.finishNode(node, update ? "UpdateExpression" : "UnaryExpression");
    } else {
      expr = this.parseExprSubscripts(refDestructuringErrors);
      if (this.checkExpressionErrors(refDestructuringErrors)) return expr;
      while (this.type.postfix && !this.canInsertSemicolon()) {
        var node = this.startNodeAt(startPos, startLoc);
        node.operator = this.value;
        node.prefix = false;
        node.argument = expr;
        this.checkLVal(expr);
        this.next();
        expr = this.finishNode(node, "UpdateExpression");
      }
    }
  
    if (!sawUnary && this.eat(_tokentype.types.starstar)) return this.buildBinary(startPos, startLoc, expr, this.parseMaybeUnary(null, false), "**", false);else return expr;
  };
  
  // Parse call, dot, and `[]`-subscript expressions.
  
  pp.parseExprSubscripts = function (refDestructuringErrors) {
    var startPos = this.start,
        startLoc = this.startLoc;
    var expr = this.parseExprAtom(refDestructuringErrors);
    var skipArrowSubscripts = expr.type === "ArrowFunctionExpression" && this.input.slice(this.lastTokStart, this.lastTokEnd) !== ")";
    if (this.checkExpressionErrors(refDestructuringErrors) || skipArrowSubscripts) return expr;
    return this.parseSubscripts(expr, startPos, startLoc);
  };
  
  pp.parseSubscripts = function (base, startPos, startLoc, noCalls) {
    for (;;) {
      if (this.eat(_tokentype.types.dot)) {
        var node = this.startNodeAt(startPos, startLoc);
        node.object = base;
        node.property = this.parseIdent(true);
        node.computed = false;
        base = this.finishNode(node, "MemberExpression");
      } else if (this.eat(_tokentype.types.bracketL)) {
        var node = this.startNodeAt(startPos, startLoc);
        node.object = base;
        node.property = this.parseExpression();
        node.computed = true;
        this.expect(_tokentype.types.bracketR);
        base = this.finishNode(node, "MemberExpression");
      } else if (!noCalls && this.eat(_tokentype.types.parenL)) {
        var node = this.startNodeAt(startPos, startLoc);
        node.callee = base;
        node.arguments = this.parseExprList(_tokentype.types.parenR, false);
        base = this.finishNode(node, "CallExpression");
      } else if (this.type === _tokentype.types.backQuote) {
        var node = this.startNodeAt(startPos, startLoc);
        node.tag = base;
        node.quasi = this.parseTemplate();
        base = this.finishNode(node, "TaggedTemplateExpression");
      } else {
        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 `{}`.
  
  pp.parseExprAtom = function (refDestructuringErrors) {
    var node = undefined,
        canBeArrow = this.potentialArrowAt == this.start;
    switch (this.type) {
      case _tokentype.types._super:
        if (!this.inFunction) this.raise(this.start, "'super' outside of function or class");
  
      case _tokentype.types._this:
        var type = this.type === _tokentype.types._this ? "ThisExpression" : "Super";
        node = this.startNode();
        this.next();
        return this.finishNode(node, type);
  
      case _tokentype.types.name:
        var startPos = this.start,
            startLoc = this.startLoc;
        var id = this.parseIdent(this.type !== _tokentype.types.name);
        if (canBeArrow && !this.canInsertSemicolon() && this.eat(_tokentype.types.arrow)) return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), [id]);
        return id;
  
      case _tokentype.types.regexp:
        var value = this.value;
        node = this.parseLiteral(value.value);
        node.regex = { pattern: value.pattern, flags: value.flags };
        return node;
  
      case _tokentype.types.num:case _tokentype.types.string:
        return this.parseLiteral(this.value);
  
      case _tokentype.types._null:case _tokentype.types._true:case _tokentype.types._false:
        node = this.startNode();
        node.value = this.type === _tokentype.types._null ? null : this.type === _tokentype.types._true;
        node.raw = this.type.keyword;
        this.next();
        return this.finishNode(node, "Literal");
  
      case _tokentype.types.parenL:
        return this.parseParenAndDistinguishExpression(canBeArrow);
  
      case _tokentype.types.bracketL:
        node = this.startNode();
        this.next();
        node.elements = this.parseExprList(_tokentype.types.bracketR, true, true, refDestructuringErrors);
        return this.finishNode(node, "ArrayExpression");
  
      case _tokentype.types.braceL:
        return this.parseObj(false, refDestructuringErrors);
  
      case _tokentype.types._function:
        node = this.startNode();
        this.next();
        return this.parseFunction(node, false);
  
      case _tokentype.types._class:
        return this.parseClass(this.startNode(), false);
  
      case _tokentype.types._new:
        return this.parseNew();
  
      case _tokentype.types.backQuote:
        return this.parseTemplate();
  
      default:
        this.unexpected();
    }
  };
  
  pp.parseLiteral = function (value) {
    var node = this.startNode();
    node.value = value;
    node.raw = this.input.slice(this.start, this.end);
    this.next();
    return this.finishNode(node, "Literal");
  };
  
  pp.parseParenExpression = function () {
    this.expect(_tokentype.types.parenL);
    var val = this.parseExpression();
    this.expect(_tokentype.types.parenR);
    return val;
  };
  
  pp.parseParenAndDistinguishExpression = function (canBeArrow) {
    var startPos = this.start,
        startLoc = this.startLoc,
        val = undefined;
    if (this.options.ecmaVersion >= 6) {
      this.next();
  
      var innerStartPos = this.start,
          innerStartLoc = this.startLoc;
      var exprList = [],
          first = true;
      var refDestructuringErrors = new _parseutil.DestructuringErrors(),
          spreadStart = undefined,
          innerParenStart = undefined;
      while (this.type !== _tokentype.types.parenR) {
        first ? first = false : this.expect(_tokentype.types.comma);
        if (this.type === _tokentype.types.ellipsis) {
          spreadStart = this.start;
          exprList.push(this.parseParenItem(this.parseRest()));
          break;
        } else {
          if (this.type === _tokentype.types.parenL && !innerParenStart) {
            innerParenStart = this.start;
          }
          exprList.push(this.parseMaybeAssign(false, refDestructuringErrors, this.parseParenItem));
        }
      }
      var innerEndPos = this.start,
          innerEndLoc = this.startLoc;
      this.expect(_tokentype.types.parenR);
  
      if (canBeArrow && !this.canInsertSemicolon() && this.eat(_tokentype.types.arrow)) {
        this.checkPatternErrors(refDestructuringErrors, true);
        if (innerParenStart) this.unexpected(innerParenStart);
        return this.parseParenArrowList(startPos, startLoc, exprList);
      }
  
      if (!exprList.length) this.unexpected(this.lastTokStart);
      if (spreadStart) this.unexpected(spreadStart);
      this.checkExpressionErrors(refDestructuringErrors, true);
  
      if (exprList.length > 1) {
        val = this.startNodeAt(innerStartPos, innerStartLoc);
        val.expressions = exprList;
        this.finishNodeAt(val, "SequenceExpression", innerEndPos, innerEndLoc);
      } else {
        val = exprList[0];
      }
    } else {
      val = this.parseParenExpression();
    }
  
    if (this.options.preserveParens) {
      var par = this.startNodeAt(startPos, startLoc);
      par.expression = val;
      return this.finishNode(par, "ParenthesizedExpression");
    } else {
      return val;
    }
  };
  
  pp.parseParenItem = function (item) {
    return item;
  };
  
  pp.parseParenArrowList = function (startPos, startLoc, exprList) {
    return this.parseArrowExpression(this.startNodeAt(startPos, startLoc), exprList);
  };
  
  // 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 noCalls
  // argument to parseSubscripts to prevent it from consuming the
  // argument list.
  
  var empty = [];
  
  pp.parseNew = function () {
    var node = this.startNode();
    var meta = this.parseIdent(true);
    if (this.options.ecmaVersion >= 6 && this.eat(_tokentype.types.dot)) {
      node.meta = meta;
      node.property = this.parseIdent(true);
      if (node.property.name !== "target") this.raiseRecoverable(node.property.start, "The only valid meta property for new is new.target");
      if (!this.inFunction) this.raiseRecoverable(node.start, "new.target can only be used in functions");
      return this.finishNode(node, "MetaProperty");
    }
    var startPos = this.start,
        startLoc = this.startLoc;
    node.callee = this.parseSubscripts(this.parseExprAtom(), startPos, startLoc, true);
    if (this.eat(_tokentype.types.parenL)) node.arguments = this.parseExprList(_tokentype.types.parenR, false);else node.arguments = empty;
    return this.finishNode(node, "NewExpression");
  };
  
  // Parse template expression.
  
  pp.parseTemplateElement = function () {
    var elem = this.startNode();
    elem.value = {
      raw: this.input.slice(this.start, this.end).replace(/\r\n?/g, '\n'),
      cooked: this.value
    };
    this.next();
    elem.tail = this.type === _tokentype.types.backQuote;
    return this.finishNode(elem, "TemplateElement");
  };
  
  pp.parseTemplate = function () {
    var node = this.startNode();
    this.next();
    node.expressions = [];
    var curElt = this.parseTemplateElement();
    node.quasis = [curElt];
    while (!curElt.tail) {
      this.expect(_tokentype.types.dollarBraceL);
      node.expressions.push(this.parseExpression());
      this.expect(_tokentype.types.braceR);
      node.quasis.push(curElt = this.parseTemplateElement());
    }
    this.next();
    return this.finishNode(node, "TemplateLiteral");
  };
  
  // Parse an object literal or binding pattern.
  
  pp.parseObj = function (isPattern, refDestructuringErrors) {
    var node = this.startNode(),
        first = true,
        propHash = {};
    node.properties = [];
    this.next();
    while (!this.eat(_tokentype.types.braceR)) {
      if (!first) {
        this.expect(_tokentype.types.comma);
        if (this.afterTrailingComma(_tokentype.types.braceR)) break;
      } else first = false;
  
      var prop = this.startNode(),
          isGenerator = undefined,
          startPos = undefined,
          startLoc = undefined;
      if (this.options.ecmaVersion >= 6) {
        prop.method = false;
        prop.shorthand = false;
        if (isPattern || refDestructuringErrors) {
          startPos = this.start;
          startLoc = this.startLoc;
        }
        if (!isPattern) isGenerator = this.eat(_tokentype.types.star);
      }
      this.parsePropertyName(prop);
      this.parsePropertyValue(prop, isPattern, isGenerator, startPos, startLoc, refDestructuringErrors);
      this.checkPropClash(prop, propHash);
      node.properties.push(this.finishNode(prop, "Property"));
    }
    return this.finishNode(node, isPattern ? "ObjectPattern" : "ObjectExpression");
  };
  
  pp.parsePropertyValue = function (prop, isPattern, isGenerator, startPos, startLoc, refDestructuringErrors) {
    if (this.eat(_tokentype.types.colon)) {
      prop.value = isPattern ? this.parseMaybeDefault(this.start, this.startLoc) : this.parseMaybeAssign(false, refDestructuringErrors);
      prop.kind = "init";
    } else if (this.options.ecmaVersion >= 6 && this.type === _tokentype.types.parenL) {
      if (isPattern) this.unexpected();
      prop.kind = "init";
      prop.method = true;
      prop.value = this.parseMethod(isGenerator);
    } else if (this.options.ecmaVersion >= 5 && !prop.computed && prop.key.type === "Identifier" && (prop.key.name === "get" || prop.key.name === "set") && this.type != _tokentype.types.comma && this.type != _tokentype.types.braceR) {
      if (isGenerator || isPattern) this.unexpected();
      prop.kind = prop.key.name;
      this.parsePropertyName(prop);
      prop.value = this.parseMethod(false);
      var paramCount = prop.kind === "get" ? 0 : 1;
      if (prop.value.params.length !== paramCount) {
        var start = prop.value.start;
        if (prop.kind === "get") this.raiseRecoverable(start, "getter should have no params");else this.raiseRecoverable(start, "setter should have exactly one param");
      }
      if (prop.kind === "set" && prop.value.params[0].type === "RestElement") this.raiseRecoverable(prop.value.params[0].start, "Setter cannot use rest params");
    } else if (this.options.ecmaVersion >= 6 && !prop.computed && prop.key.type === "Identifier") {
      if (this.keywords.test(prop.key.name) || (this.strict ? this.reservedWordsStrictBind : this.reservedWords).test(prop.key.name) || this.inGenerator && prop.key.name == "yield") this.raiseRecoverable(prop.key.start, "'" + prop.key.name + "' can not be used as shorthand property");
      prop.kind = "init";
      if (isPattern) {
        prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key);
      } else if (this.type === _tokentype.types.eq && refDestructuringErrors) {
        if (!refDestructuringErrors.shorthandAssign) refDestructuringErrors.shorthandAssign = this.start;
        prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key);
      } else {
        prop.value = prop.key;
      }
      prop.shorthand = true;
    } else this.unexpected();
  };
  
  pp.parsePropertyName = function (prop) {
    if (this.options.ecmaVersion >= 6) {
      if (this.eat(_tokentype.types.bracketL)) {
        prop.computed = true;
        prop.key = this.parseMaybeAssign();
        this.expect(_tokentype.types.bracketR);
        return prop.key;
      } else {
        prop.computed = false;
      }
    }
    return prop.key = this.type === _tokentype.types.num || this.type === _tokentype.types.string ? this.parseExprAtom() : this.parseIdent(true);
  };
  
  // Initialize empty function node.
  
  pp.initFunction = function (node) {
    node.id = null;
    if (this.options.ecmaVersion >= 6) {
      node.generator = false;
      node.expression = false;
    }
  };
  
  // Parse object or class method.
  
  pp.parseMethod = function (isGenerator) {
    var node = this.startNode(),
        oldInGen = this.inGenerator;
    this.inGenerator = isGenerator;
    this.initFunction(node);
    this.expect(_tokentype.types.parenL);
    node.params = this.parseBindingList(_tokentype.types.parenR, false, false);
    if (this.options.ecmaVersion >= 6) node.generator = isGenerator;
    this.parseFunctionBody(node, false);
    this.inGenerator = oldInGen;
    return this.finishNode(node, "FunctionExpression");
  };
  
  // Parse arrow function expression with given parameters.
  
  pp.parseArrowExpression = function (node, params) {
    var oldInGen = this.inGenerator;
    this.inGenerator = false;
    this.initFunction(node);
    node.params = this.toAssignableList(params, true);
    this.parseFunctionBody(node, true);
    this.inGenerator = oldInGen;
    return this.finishNode(node, "ArrowFunctionExpression");
  };
  
  // Parse function body and check parameters.
  
  pp.parseFunctionBody = function (node, isArrowFunction) {
    var isExpression = isArrowFunction && this.type !== _tokentype.types.braceL;
  
    if (isExpression) {
      node.body = this.parseMaybeAssign();
      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 = this.inFunction,
          oldLabels = this.labels;
      this.inFunction = true;this.labels = [];
      node.body = this.parseBlock(true);
      node.expression = false;
      this.inFunction = oldInFunc;this.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 (this.strict || !isExpression && node.body.body.length && this.isUseStrict(node.body.body[0])) {
      var oldStrict = this.strict;
      this.strict = true;
      if (node.id) this.checkLVal(node.id, true);
      this.checkParams(node);
      this.strict = oldStrict;
    } else if (isArrowFunction) {
      this.checkParams(node);
    }
  };
  
  // Checks function params for various disallowed patterns such as using "eval"
  // or "arguments" and duplicate parameters.
  
  pp.checkParams = function (node) {
    var nameHash = {};
    for (var i = 0; i < node.params.length; i++) {
      this.checkLVal(node.params[i], true, nameHash);
    }
  };
  
  // 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).
  
  pp.parseExprList = function (close, allowTrailingComma, allowEmpty, refDestructuringErrors) {
    var elts = [],
        first = true;
    while (!this.eat(close)) {
      if (!first) {
        this.expect(_tokentype.types.comma);
        if (allowTrailingComma && this.afterTrailingComma(close)) break;
      } else first = false;
  
      var elt = undefined;
      if (allowEmpty && this.type === _tokentype.types.comma) elt = null;else if (this.type === _tokentype.types.ellipsis) {
        elt = this.parseSpread(refDestructuringErrors);
        if (this.type === _tokentype.types.comma && refDestructuringErrors && !refDestructuringErrors.trailingComma) {
          refDestructuringErrors.trailingComma = this.lastTokStart;
        }
      } else elt = this.parseMaybeAssign(false, refDestructuringErrors);
      elts.push(elt);
    }
    return elts;
  };
  
  // Parse the next token as an identifier. If `liberal` is true (used
  // when parsing properties), it will also convert keywords into
  // identifiers.
  
  pp.parseIdent = function (liberal) {
    var node = this.startNode();
    if (liberal && this.options.allowReserved == "never") liberal = false;
    if (this.type === _tokentype.types.name) {
      if (!liberal && (this.strict ? this.reservedWordsStrict : this.reservedWords).test(this.value) && (this.options.ecmaVersion >= 6 || this.input.slice(this.start, this.end).indexOf("\\") == -1)) this.raiseRecoverable(this.start, "The keyword '" + this.value + "' is reserved");
      if (!liberal && this.inGenerator && this.value === "yield") this.raiseRecoverable(this.start, "Can not use 'yield' as identifier inside a generator");
      node.name = this.value;
    } else if (liberal && this.type.keyword) {
      node.name = this.type.keyword;
    } else {
      this.unexpected();
    }
    this.next();
    return this.finishNode(node, "Identifier");
  };
  
  // Parses yield expression inside generator.
  
  pp.parseYield = function () {
    var node = this.startNode();
    this.next();
    if (this.type == _tokentype.types.semi || this.canInsertSemicolon() || this.type != _tokentype.types.star && !this.type.startsExpr) {
      node.delegate = false;
      node.argument = null;
    } else {
      node.delegate = this.eat(_tokentype.types.star);
      node.argument = this.parseMaybeAssign();
    }
    return this.finishNode(node, "YieldExpression");
  };
  
  },{"./parseutil":9,"./state":10,"./tokentype":14}],2:[function(_dereq_,module,exports){
  // Reserved word lists for various dialects of the language
  
  "use strict";
  
  exports.__esModule = true;
  exports.isIdentifierStart = isIdentifierStart;
  exports.isIdentifierChar = isIdentifierChar;
  var reservedWords = {
    3: "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",
    5: "class enum extends super const export import",
    6: "enum",
    7: "enum",
    strict: "implements interface let package private protected public static yield",
    strictBind: "eval arguments"
  };
  
  exports.reservedWords = reservedWords;
  // 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 keywords = {
    5: ecma5AndLessKeywords,
    6: ecma5AndLessKeywords + " const class extends export import super"
  };
  
  exports.keywords = keywords;
  // ## 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 `bin/generate-identifier-regex.js`.
  
  var nonASCIIidentifierStartChars = "ªµºÀ-ÖØ-öø-ˁˆ-ˑˠ-ˤˬˮͰ-ʹͶͷͺ-ͽͿΆΈ-ΊΌΎ-ΡΣ-ϵϷ-ҁҊ-ԯԱ-Ֆՙա-ևא-תװ-ײؠ-يٮٯٱ-ۓەۥۦۮۯۺ-ۼۿܐܒ-ܯݍ-ޥޱߊ-ߪߴߵߺࠀ-ࠕࠚࠤࠨࡀ-ࡘࢠ-ࢴऄ-हऽॐक़-ॡॱ-ঀঅ-ঌএঐও-নপ-রলশ-হঽৎড়ঢ়য়-ৡৰৱਅ-ਊਏਐਓ-ਨਪ-ਰਲਲ਼ਵਸ਼ਸਹਖ਼-ੜਫ਼ੲ-ੴઅ-ઍએ-ઑઓ-નપ-રલળવ-હઽૐૠૡૹଅ-ଌଏଐଓ-ନପ-ରଲଳଵ-ହଽଡ଼ଢ଼ୟ-ୡୱஃஅ-ஊஎ-ஐஒ-கஙசஜஞடணதந-பம-ஹௐఅ-ఌఎ-ఐఒ-నప-హఽౘ-ౚౠౡಅ-ಌಎ-ಐಒ-ನಪ-ಳವ-ಹಽೞೠೡೱೲഅ-ഌഎ-ഐഒ-ഺഽൎൟ-ൡൺ-ൿඅ-ඖක-නඳ-රලව-ෆก-ะาำเ-ๆກຂຄງຈຊຍດ-ທນ-ຟມ-ຣລວສຫອ-ະາຳຽເ-ໄໆໜ-ໟༀཀ-ཇཉ-ཬྈ-ྌက-ဪဿၐ-ၕၚ-ၝၡၥၦၮ-ၰၵ-ႁႎႠ-ჅჇჍა-ჺჼ-ቈቊ-ቍቐ-ቖቘቚ-ቝበ-ኈኊ-ኍነ-ኰኲ-ኵኸ-ኾዀዂ-ዅወ-ዖዘ-ጐጒ-ጕጘ-ፚᎀ-ᎏᎠ-Ᏽᏸ-ᏽᐁ-ᙬᙯ-ᙿᚁ-ᚚᚠ-ᛪᛮ-ᛸᜀ-ᜌᜎ-ᜑᜠ-ᜱᝀ-ᝑᝠ-ᝬᝮ-ᝰក-ឳៗៜᠠ-ᡷᢀ-ᢨᢪᢰ-ᣵᤀ-ᤞᥐ-ᥭᥰ-ᥴᦀ-ᦫᦰ-ᧉᨀ-ᨖᨠ-ᩔᪧᬅ-ᬳᭅ-ᭋᮃ-ᮠᮮᮯᮺ-ᯥᰀ-ᰣᱍ-ᱏᱚ-ᱽᳩ-ᳬᳮ-ᳱᳵᳶᴀ-ᶿḀ-ἕἘ-Ἕἠ-ὅὈ-Ὅὐ-ὗὙὛὝὟ-ώᾀ-ᾴᾶ-ᾼιῂ-ῄῆ-ῌῐ-ΐῖ-Ίῠ-Ῥῲ-ῴῶ-ῼⁱⁿₐ-ₜℂℇℊ-ℓℕ℘-ℝℤΩℨK-ℹℼ-ℿⅅ-ⅉⅎⅠ-ↈⰀ-Ⱞⰰ-ⱞⱠ-ⳤⳫ-ⳮⳲⳳⴀ-ⴥⴧⴭⴰ-ⵧⵯⶀ-ⶖⶠ-ⶦⶨ-ⶮⶰ-ⶶⶸ-ⶾⷀ-ⷆⷈ-ⷎⷐ-ⷖⷘ-ⷞ々-〇〡-〩〱-〵〸-〼ぁ-ゖ゛-ゟァ-ヺー-ヿㄅ-ㄭㄱ-ㆎㆠ-ㆺㇰ-ㇿ㐀-䶵一-鿕ꀀ-ꒌꓐ-ꓽꔀ-ꘌꘐ-ꘟꘪꘫꙀ-ꙮꙿ-ꚝꚠ-ꛯꜗ-ꜟꜢ-ꞈꞋ-ꞭꞰ-ꞷꟷ-ꠁꠃ-ꠅꠇ-ꠊꠌ-ꠢꡀ-ꡳꢂ-ꢳꣲ-ꣷꣻꣽꤊ-ꤥꤰ-ꥆꥠ-ꥼꦄ-ꦲꧏꧠ-ꧤꧦ-ꧯꧺ-ꧾꨀ-ꨨꩀ-ꩂꩄ-ꩋꩠ-ꩶꩺꩾ-ꪯꪱꪵꪶꪹ-ꪽꫀꫂꫛ-ꫝꫠ-ꫪꫲ-ꫴꬁ-ꬆꬉ-ꬎꬑ-ꬖꬠ-ꬦꬨ-ꬮꬰ-ꭚꭜ-ꭥꭰ-ꯢ가-힣ힰ-ퟆퟋ-ퟻ豈-舘並-龎ﬀ-ﬆﬓ-ﬗיִײַ-ﬨשׁ-זּטּ-לּמּנּסּףּפּצּ-ﮱﯓ-ﴽﵐ-ﶏﶒ-ﷇﷰ-ﷻﹰ-ﹴﹶ-ﻼＡ-Ｚａ-ｚｦ-ﾾￂ-ￇￊ-ￏￒ-ￗￚ-ￜ";
  var nonASCIIidentifierChars = "‌‍·̀-ͯ·҃-֑҇-ׇֽֿׁׂׅׄؐ-ًؚ-٩ٰۖ-ۜ۟-۪ۤۧۨ-ۭ۰-۹ܑܰ-݊ަ-ް߀-߉߫-߳ࠖ-࠙ࠛ-ࠣࠥ-ࠧࠩ-࡙࠭-࡛ࣣ-ःऺ-़ा-ॏ॑-ॗॢॣ०-९ঁ-ঃ়া-ৄেৈো-্ৗৢৣ০-৯ਁ-ਃ਼ਾ-ੂੇੈੋ-੍ੑ੦-ੱੵઁ-ઃ઼ા-ૅે-ૉો-્ૢૣ૦-૯ଁ-ଃ଼ା-ୄେୈୋ-୍ୖୗୢୣ୦-୯ஂா-ூெ-ைொ-்ௗ௦-௯ఀ-ఃా-ౄె-ైొ-్ౕౖౢౣ౦-౯ಁ-ಃ಼ಾ-ೄೆ-ೈೊ-್ೕೖೢೣ೦-೯ഁ-ഃാ-ൄെ-ൈൊ-്ൗൢൣ൦-൯ංඃ්ා-ුූෘ-ෟ෦-෯ෲෳัิ-ฺ็-๎๐-๙ັິ-ູົຼ່-ໍ໐-໙༘༙༠-༩༹༵༷༾༿ཱ-྄྆྇ྍ-ྗྙ-ྼ࿆ါ-ှ၀-၉ၖ-ၙၞ-ၠၢ-ၤၧ-ၭၱ-ၴႂ-ႍႏ-ႝ፝-፟፩-፱ᜒ-᜔ᜲ-᜴ᝒᝓᝲᝳ឴-៓៝០-៩᠋-᠍᠐-᠙ᢩᤠ-ᤫᤰ-᤻᥆-᥏᧐-᧚ᨗ-ᨛᩕ-ᩞ᩠-᩿᩼-᪉᪐-᪙᪰-᪽ᬀ-ᬄ᬴-᭄᭐-᭙᭫-᭳ᮀ-ᮂᮡ-ᮭ᮰-᮹᯦-᯳ᰤ-᰷᱀-᱉᱐-᱙᳐-᳔᳒-᳨᳭ᳲ-᳴᳸᳹᷀-᷵᷼-᷿‿⁀⁔⃐-⃥⃜⃡-⃰⳯-⵿⳱ⷠ-〪ⷿ-゙゚〯꘠-꘩꙯ꙴ-꙽ꚞꚟ꛰꛱ꠂ꠆ꠋꠣ-ꠧꢀꢁꢴ-꣄꣐-꣙꣠-꣱꤀-꤉ꤦ-꤭ꥇ-꥓ꦀ-ꦃ꦳-꧀꧐-꧙ꧥ꧰-꧹ꨩ-ꨶꩃꩌꩍ꩐-꩙ꩻ-ꩽꪰꪲ-ꪴꪷꪸꪾ꪿꫁ꫫ-ꫯꫵ꫶ꯣ-ꯪ꯬꯭꯰-꯹ﬞ︀-️︠-︯︳︴﹍-﹏０-９＿";
  
  var nonASCIIidentifierStart = new RegExp("[" + nonASCIIidentifierStartChars + "]");
  var nonASCIIidentifier = new RegExp("[" + nonASCIIidentifierStartChars + nonASCIIidentifierChars + "]");
  
  nonASCIIidentifierStartChars = nonASCIIidentifierChars = null;
  
  // These are a run-length and offset encoded representation of the
  // >0xffff code points that are a valid part of identifiers. The
  // offset starts at 0x10000, and each pair of numbers represents an
  // offset to the next range, and then a size of the range. They were
  // generated by bin/generate-identifier-regex.js
  var astralIdentifierStartCodes = [0, 11, 2, 25, 2, 18, 2, 1, 2, 14, 3, 13, 35, 122, 70, 52, 268, 28, 4, 48, 48, 31, 17, 26, 6, 37, 11, 29, 3, 35, 5, 7, 2, 4, 43, 157, 99, 39, 9, 51, 157, 310, 10, 21, 11, 7, 153, 5, 3, 0, 2, 43, 2, 1, 4, 0, 3, 22, 11, 22, 10, 30, 66, 18, 2, 1, 11, 21, 11, 25, 71, 55, 7, 1, 65, 0, 16, 3, 2, 2, 2, 26, 45, 28, 4, 28, 36, 7, 2, 27, 28, 53, 11, 21, 11, 18, 14, 17, 111, 72, 56, 50, 14, 50, 785, 52, 76, 44, 33, 24, 27, 35, 42, 34, 4, 0, 13, 47, 15, 3, 22, 0, 2, 0, 36, 17, 2, 24, 85, 6, 2, 0, 2, 3, 2, 14, 2, 9, 8, 46, 39, 7, 3, 1, 3, 21, 2, 6, 2, 1, 2, 4, 4, 0, 19, 0, 13, 4, 287, 47, 21, 1, 2, 0, 185, 46, 42, 3, 37, 47, 21, 0, 60, 42, 86, 25, 391, 63, 32, 0, 449, 56, 1288, 921, 103, 110, 18, 195, 2749, 1070, 4050, 582, 8634, 568, 8, 30, 114, 29, 19, 47, 17, 3, 32, 20, 6, 18, 881, 68, 12, 0, 67, 12, 16481, 1, 3071, 106, 6, 12, 4, 8, 8, 9, 5991, 84, 2, 70, 2, 1, 3, 0, 3, 1, 3, 3, 2, 11, 2, 0, 2, 6, 2, 64, 2, 3, 3, 7, 2, 6, 2, 27, 2, 3, 2, 4, 2, 0, 4, 6, 2, 339, 3, 24, 2, 24, 2, 30, 2, 24, 2, 30, 2, 24, 2, 30, 2, 24, 2, 30, 2, 24, 2, 7, 4149, 196, 1340, 3, 2, 26, 2, 1, 2, 0, 3, 0, 2, 9, 2, 3, 2, 0, 2, 0, 7, 0, 5, 0, 2, 0, 2, 0, 2, 2, 2, 1, 2, 0, 3, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 1, 2, 0, 3, 3, 2, 6, 2, 3, 2, 3, 2, 0, 2, 9, 2, 16, 6, 2, 2, 4, 2, 16, 4421, 42710, 42, 4148, 12, 221, 3, 5761, 10591, 541];
  var astralIdentifierCodes = [509, 0, 227, 0, 150, 4, 294, 9, 1368, 2, 2, 1, 6, 3, 41, 2, 5, 0, 166, 1, 1306, 2, 54, 14, 32, 9, 16, 3, 46, 10, 54, 9, 7, 2, 37, 13, 2, 9, 52, 0, 13, 2, 49, 13, 10, 2, 4, 9, 83, 11, 168, 11, 6, 9, 7, 3, 57, 0, 2, 6, 3, 1, 3, 2, 10, 0, 11, 1, 3, 6, 4, 4, 316, 19, 13, 9, 214, 6, 3, 8, 28, 1, 83, 16, 16, 9, 82, 12, 9, 9, 84, 14, 5, 9, 423, 9, 20855, 9, 135, 4, 60, 6, 26, 9, 1016, 45, 17, 3, 19723, 1, 5319, 4, 4, 5, 9, 7, 3, 6, 31, 3, 149, 2, 1418, 49, 513, 54, 5, 49, 9, 0, 15, 0, 23, 4, 2, 14, 3617, 6, 792618, 239];
  
  // This has a complexity linear to the value of the code. The
  // assumption is that looking up astral identifier characters is
  // rare.
  function isInAstralSet(code, set) {
    var pos = 0x10000;
    for (var i = 0; i < set.length; i += 2) {
      pos += set[i];
      if (pos > code) return false;
      pos += set[i + 1];
      if (pos >= code) return true;
    }
  }
  
  // Test whether a given character code starts an identifier.
  
  function isIdentifierStart(code, astral) {
    if (code < 65) return code === 36;
    if (code < 91) return true;
    if (code < 97) return code === 95;
    if (code < 123) return true;
    if (code <= 0xffff) return code >= 0xaa && nonASCIIidentifierStart.test(String.fromCharCode(code));
    if (astral === false) return false;
    return isInAstralSet(code, astralIdentifierStartCodes);
  }
  
  // Test whether a given character is part of an identifier.
  
  function isIdentifierChar(code, astral) {
    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;
    if (code <= 0xffff) return code >= 0xaa && nonASCIIidentifier.test(String.fromCharCode(code));
    if (astral === false) return false;
    return isInAstralSet(code, astralIdentifierStartCodes) || isInAstralSet(code, astralIdentifierCodes);
  }
  
  },{}],3:[function(_dereq_,module,exports){
  // Acorn is a tiny, fast JavaScript parser written in JavaScript.
  //
  // Acorn was written by Marijn Haverbeke, Ingvar Stepanyan, and
  // various contributors and released under an MIT license.
  //
  // Git repositories for Acorn are available at
  //
  //     http://marijnhaverbeke.nl/git/acorn
  //     https://github.com/ternjs/acorn.git
  //
  // Please use the [github bug tracker][ghbt] to report issues.
  //
  // [ghbt]: https://github.com/ternjs/acorn/issues
  //
  // This file defines the main parser interface. The library also comes
  // with a [error-tolerant parser][dammit] and an
  // [abstract syntax tree walker][walk], defined in other files.
  //
  // [dammit]: acorn_loose.js
  // [walk]: util/walk.js
  
  "use strict";
  
  exports.__esModule = true;
  exports.parse = parse;
  exports.parseExpressionAt = parseExpressionAt;
  exports.tokenizer = tokenizer;
  
  var _state = _dereq_("./state");
  
  _dereq_("./parseutil");
  
  _dereq_("./statement");
  
  _dereq_("./lval");
  
  _dereq_("./expression");
  
  _dereq_("./location");
  
  exports.Parser = _state.Parser;
  exports.plugins = _state.plugins;
  
  var _options = _dereq_("./options");
  
  exports.defaultOptions = _options.defaultOptions;
  
  var _locutil = _dereq_("./locutil");
  
  exports.Position = _locutil.Position;
  exports.SourceLocation = _locutil.SourceLocation;
  exports.getLineInfo = _locutil.getLineInfo;
  
  var _node = _dereq_("./node");
  
  exports.Node = _node.Node;
  
  var _tokentype = _dereq_("./tokentype");
  
  exports.TokenType = _tokentype.TokenType;
  exports.tokTypes = _tokentype.types;
  
  var _tokencontext = _dereq_("./tokencontext");
  
  exports.TokContext = _tokencontext.TokContext;
  exports.tokContexts = _tokencontext.types;
  
  var _identifier = _dereq_("./identifier");
  
  exports.isIdentifierChar = _identifier.isIdentifierChar;
  exports.isIdentifierStart = _identifier.isIdentifierStart;
  
  var _tokenize = _dereq_("./tokenize");
  
  exports.Token = _tokenize.Token;
  
  var _whitespace = _dereq_("./whitespace");
  
  exports.isNewLine = _whitespace.isNewLine;
  exports.lineBreak = _whitespace.lineBreak;
  exports.lineBreakG = _whitespace.lineBreakG;
  var version = "3.1.0";
  
  exports.version = version;
  // 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][api].
  //
  // [api]: https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API
  
  function parse(input, options) {
    return new _state.Parser(options, input).parse();
  }
  
  // This function tries to parse a single expression at a given
  // offset in a string. Useful for parsing mixed-language formats
  // that embed JavaScript expressions.
  
  function parseExpressionAt(input, pos, options) {
    var p = new _state.Parser(options, input, pos);
    p.nextToken();
    return p.parseExpression();
  }
  
  // Acorn is organized as a tokenizer and a recursive-descent parser.
  // The `tokenizer` export provides an interface to the tokenizer.
  
  function tokenizer(input, options) {
    return new _state.Parser(options, input);
  }
  
  },{"./expression":1,"./identifier":2,"./location":4,"./locutil":5,"./lval":6,"./node":7,"./options":8,"./parseutil":9,"./state":10,"./statement":11,"./tokencontext":12,"./tokenize":13,"./tokentype":14,"./whitespace":16}],4:[function(_dereq_,module,exports){
  "use strict";
  
  var _state = _dereq_("./state");
  
  var _locutil = _dereq_("./locutil");
  
  var pp = _state.Parser.prototype;
  
  // 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.
  
  pp.raise = function (pos, message) {
    var loc = _locutil.getLineInfo(this.input, pos);
    message += " (" + loc.line + ":" + loc.column + ")";
    var err = new SyntaxError(message);
    err.pos = pos;err.loc = loc;err.raisedAt = this.pos;
    throw err;
  };
  
  pp.raiseRecoverable = pp.raise;
  
  pp.curPosition = function () {
    if (this.options.locations) {
      return new _locutil.Position(this.curLine, this.pos - this.lineStart);
    }
  };
  
  },{"./locutil":5,"./state":10}],5:[function(_dereq_,module,exports){
  "use strict";
  
  exports.__esModule = true;
  exports.getLineInfo = getLineInfo;
  
  function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
  
  var _whitespace = _dereq_("./whitespace");
  
  // These are used when `options.locations` is on, for the
  // `startLoc` and `endLoc` properties.
  
  var Position = (function () {
    function Position(line, col) {
      _classCallCheck(this, Position);
  
      this.line = line;
      this.column = col;
    }
  
    Position.prototype.offset = function offset(n) {
      return new Position(this.line, this.column + n);
    };
  
    return Position;
  })();
  
  exports.Position = Position;
  
  var SourceLocation = function SourceLocation(p, start, end) {
    _classCallCheck(this, SourceLocation);
  
    this.start = start;
    this.end = end;
    if (p.sourceFile !== null) this.source = p.sourceFile;
  }
  
  // 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.
  
  ;
  
  exports.SourceLocation = SourceLocation;
  
  function getLineInfo(input, offset) {
    for (var line = 1, cur = 0;;) {
      _whitespace.lineBreakG.lastIndex = cur;
      var match = _whitespace.lineBreakG.exec(input);
      if (match && match.index < offset) {
        ++line;
        cur = match.index + match[0].length;
      } else {
        return new Position(line, offset - cur);
      }
    }
  }
  
  },{"./whitespace":16}],6:[function(_dereq_,module,exports){
  "use strict";
  
  var _tokentype = _dereq_("./tokentype");
  
  var _state = _dereq_("./state");
  
  var _util = _dereq_("./util");
  
  var pp = _state.Parser.prototype;
  
  // Convert existing expression atom to assignable pattern
  // if possible.
  
  pp.toAssignable = function (node, isBinding) {
    if (this.options.ecmaVersion >= 6 && node) {
      switch (node.type) {
        case "Identifier":
        case "ObjectPattern":
        case "ArrayPattern":
          break;
  
        case "ObjectExpression":
          node.type = "ObjectPattern";
          for (var i = 0; i < node.properties.length; i++) {
            var prop = node.properties[i];
            if (prop.kind !== "init") this.raise(prop.key.start, "Object pattern can't contain getter or setter");
            this.toAssignable(prop.value, isBinding);
          }
          break;
  
        case "ArrayExpression":
          node.type = "ArrayPattern";
          this.toAssignableList(node.elements, isBinding);
          break;
  
        case "AssignmentExpression":
          if (node.operator === "=") {
            node.type = "AssignmentPattern";
            delete node.operator;
            // falls through to AssignmentPattern
          } else {
              this.raise(node.left.end, "Only '=' operator can be used for specifying default value.");
              break;
            }
  
        case "AssignmentPattern":
          if (node.right.type === "YieldExpression") this.raise(node.right.start, "Yield expression cannot be a default value");
          break;
  
        case "ParenthesizedExpression":
          node.expression = this.toAssignable(node.expression, isBinding);
          break;
  
        case "MemberExpression":
          if (!isBinding) break;
  
        default:
          this.raise(node.start, "Assigning to rvalue");
      }
    }
    return node;
  };
  
  // Convert list of expression atoms to binding list.
  
  pp.toAssignableList = function (exprList, isBinding) {
    var end = exprList.length;
    if (end) {
      var last = exprList[end - 1];
      if (last && last.type == "RestElement") {
        --end;
      } else if (last && last.type == "SpreadElement") {
        last.type = "RestElement";
        var arg = last.argument;
        this.toAssignable(arg, isBinding);
        if (arg.type !== "Identifier" && arg.type !== "MemberExpression" && arg.type !== "ArrayPattern") this.unexpected(arg.start);
        --end;
      }
  
      if (isBinding && last.type === "RestElement" && last.argument.type !== "Identifier") this.unexpected(last.argument.start);
    }
    for (var i = 0; i < end; i++) {
      var elt = exprList[i];
      if (elt) this.toAssignable(elt, isBinding);
    }
    return exprList;
  };
  
  // Parses spread element.
  
  pp.parseSpread = function (refDestructuringErrors) {
    var node = this.startNode();
    this.next();
    node.argument = this.parseMaybeAssign(refDestructuringErrors);
    return this.finishNode(node, "SpreadElement");
  };
  
  pp.parseRest = function (allowNonIdent) {
    var node = this.startNode();
    this.next();
  
    // RestElement inside of a function parameter must be an identifier
    if (allowNonIdent) node.argument = this.type === _tokentype.types.name ? this.parseIdent() : this.unexpected();else node.argument = this.type === _tokentype.types.name || this.type === _tokentype.types.bracketL ? this.parseBindingAtom() : this.unexpected();
  
    return this.finishNode(node, "RestElement");
  };
  
  // Parses lvalue (assignable) atom.
  
  pp.parseBindingAtom = function () {
    if (this.options.ecmaVersion < 6) return this.parseIdent();
    switch (this.type) {
      case _tokentype.types.name:
        return this.parseIdent();
  
      case _tokentype.types.bracketL:
        var node = this.startNode();
        this.next();
        node.elements = this.parseBindingList(_tokentype.types.bracketR, true, true);
        return this.finishNode(node, "ArrayPattern");
  
      case _tokentype.types.braceL:
        return this.parseObj(true);
  
      default:
        this.unexpected();
    }
  };
  
  pp.parseBindingList = function (close, allowEmpty, allowTrailingComma, allowNonIdent) {
    var elts = [],
        first = true;
    while (!this.eat(close)) {
      if (first) first = false;else this.expect(_tokentype.types.comma);
      if (allowEmpty && this.type === _tokentype.types.comma) {
        elts.push(null);
      } else if (allowTrailingComma && this.afterTrailingComma(close)) {
        break;
      } else if (this.type === _tokentype.types.ellipsis) {
        var rest = this.parseRest(allowNonIdent);
        this.parseBindingListItem(rest);
        elts.push(rest);
        if (this.type === _tokentype.types.comma) this.raise(this.start, "Comma is not permitted after the rest element");
        this.expect(close);
        break;
      } else {
        var elem = this.parseMaybeDefault(this.start, this.startLoc);
        this.parseBindingListItem(elem);
        elts.push(elem);
      }
    }
    return elts;
  };
  
  pp.parseBindingListItem = function (param) {
    return param;
  };
  
  // Parses assignment pattern around given atom if possible.
  
  pp.parseMaybeDefault = function (startPos, startLoc, left) {
    left = left || this.parseBindingAtom();
    if (this.options.ecmaVersion < 6 || !this.eat(_tokentype.types.eq)) return left;
    var node = this.startNodeAt(startPos, startLoc);
    node.left = left;
    node.right = this.parseMaybeAssign();
    return this.finishNode(node, "AssignmentPattern");
  };
  
  // Verify that a node is an lval — something that can be assigned
  // to.
  
  pp.checkLVal = function (expr, isBinding, checkClashes) {
    switch (expr.type) {
      case "Identifier":
        if (this.strict && this.reservedWordsStrictBind.test(expr.name)) this.raiseRecoverable(expr.start, (isBinding ? "Binding " : "Assigning to ") + expr.name + " in strict mode");
        if (checkClashes) {
          if (_util.has(checkClashes, expr.name)) this.raiseRecoverable(expr.start, "Argument name clash");
          checkClashes[expr.name] = true;
        }
        break;
  
      case "MemberExpression":
        if (isBinding) this.raiseRecoverable(expr.start, (isBinding ? "Binding" : "Assigning to") + " member expression");
        break;
  
      case "ObjectPattern":
        for (var i = 0; i < expr.properties.length; i++) {
          this.checkLVal(expr.properties[i].value, isBinding, checkClashes);
        }break;
  
      case "ArrayPattern":
        for (var i = 0; i < expr.elements.length; i++) {
          var elem = expr.elements[i];
          if (elem) this.checkLVal(elem, isBinding, checkClashes);
        }
        break;
  
      case "AssignmentPattern":
        this.checkLVal(expr.left, isBinding, checkClashes);
        break;
  
      case "RestElement":
        this.checkLVal(expr.argument, isBinding, checkClashes);
        break;
  
      case "ParenthesizedExpression":
        this.checkLVal(expr.expression, isBinding, checkClashes);
        break;
  
      default:
        this.raise(expr.start, (isBinding ? "Binding" : "Assigning to") + " rvalue");
    }
  };
  
  },{"./state":10,"./tokentype":14,"./util":15}],7:[function(_dereq_,module,exports){
  "use strict";
  
  exports.__esModule = true;
  
  function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
  
  var _state = _dereq_("./state");
  
  var _locutil = _dereq_("./locutil");
  
  var Node = function Node(parser, pos, loc) {
    _classCallCheck(this, Node);
  
    this.type = "";
    this.start = pos;
    this.end = 0;
    if (parser.options.locations) this.loc = new _locutil.SourceLocation(parser, loc);
    if (parser.options.directSourceFile) this.sourceFile = parser.options.directSourceFile;
    if (parser.options.ranges) this.range = [pos, 0];
  }
  
  // Start an AST node, attaching a start offset.
  
  ;
  
  exports.Node = Node;
  var pp = _state.Parser.prototype;
  
  pp.startNode = function () {
    return new Node(this, this.start, this.startLoc);
  };
  
  pp.startNodeAt = function (pos, loc) {
    return new Node(this, pos, loc);
  };
  
  // Finish an AST node, adding `type` and `end` properties.
  
  function finishNodeAt(node, type, pos, loc) {
    node.type = type;
    node.end = pos;
    if (this.options.locations) node.loc.end = loc;
    if (this.options.ranges) node.range[1] = pos;
    return node;
  }
  
  pp.finishNode = function (node, type) {
    return finishNodeAt.call(this, node, type, this.lastTokEnd, this.lastTokEndLoc);
  };
  
  // Finish node at given position
  
  pp.finishNodeAt = function (node, type, pos, loc) {
    return finishNodeAt.call(this, node, type, pos, loc);
  };
  
  },{"./locutil":5,"./state":10}],8:[function(_dereq_,module,exports){
  "use strict";
  
  exports.__esModule = true;
  exports.getOptions = getOptions;
  
  var _util = _dereq_("./util");
  
  var _locutil = _dereq_("./locutil");
  
  // A second optional argument can be given to further configure
  // the parser process. These options are recognized:
  
  var 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. The default is 6.
    ecmaVersion: 6,
    // Source type ("script" or "module") for different semantics
    sourceType: "script",
    // `onInsertedSemicolon` can be a callback that will be called
    // when a semicolon is automatically inserted. It will be passed
    // th position of the comma as an offset, and if `locations` is
    // enabled, it is given the location as a `{line, column}` object
    // as second argument.
    onInsertedSemicolon: null,
    // `onTrailingComma` is similar to `onInsertedSemicolon`, but for
    // trailing commas.
    onTrailingComma: null,
    // By default, reserved words are only enforced if ecmaVersion >= 5.
    // Set `allowReserved` to a boolean value to explicitly turn this on
    // an off. When this option has the value "never", reserved words
    // and keywords can also not be used as property names.
    allowReserved: null,
    // When enabled, a return at the top level is not considered an
    // error.
    allowReturnOutsideFunction: false,
    // When enabled, import/export statements are not constrained to
    // appearing at the top of the program.
    allowImportExportEverywhere: false,
    // When enabled, hashbang directive in the beginning of file
    // is allowed and treated as a line comment.
    allowHashBang: 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 tokens returned from `tokenizer().getToken()`. 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] `range` property holding a `[start,
    // end]` array with the same numbers, set the `ranges` option to
    // `true`.
    //
    // [range]: https://bugzilla.mozilla.org/show_bug.cgi?id=745678
    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,
    // When enabled, parenthesized expressions are represented by
    // (non-standard) ParenthesizedExpression nodes
    preserveParens: false,
    plugins: {}
  };
  
  exports.defaultOptions = defaultOptions;
  // Interpret and default an options object
  
  function getOptions(opts) {
    var options = {};
    for (var opt in defaultOptions) {
      options[opt] = opts && _util.has(opts, opt) ? opts[opt] : defaultOptions[opt];
    }if (options.allowReserved == null) options.allowReserved = options.ecmaVersion < 5;
  
    if (_util.isArray(options.onToken)) {
      (function () {
        var tokens = options.onToken;
        options.onToken = function (token) {
          return tokens.push(token);
        };
      })();
    }
    if (_util.isArray(options.onComment)) options.onComment = pushComment(options, options.onComment);
  
    return options;
  }
  
  function pushComment(options, array) {
    return 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 _locutil.SourceLocation(this, startLoc, endLoc);
      if (options.ranges) comment.range = [start, end];
      array.push(comment);
    };
  }
  
  },{"./locutil":5,"./util":15}],9:[function(_dereq_,module,exports){
  "use strict";
  
  exports.__esModule = true;
  
  function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
  
  var _tokentype = _dereq_("./tokentype");
  
  var _state = _dereq_("./state");
  
  var _whitespace = _dereq_("./whitespace");
  
  var pp = _state.Parser.prototype;
  
  // ## Parser utilities
  
  // Test whether a statement node is the string literal `"use strict"`.
  
  pp.isUseStrict = function (stmt) {
    return this.options.ecmaVersion >= 5 && stmt.type === "ExpressionStatement" && stmt.expression.type === "Literal" && stmt.expression.raw.slice(1, -1) === "use strict";
  };
  
  // Predicate that tests whether the next token is of the given
  // type, and if yes, consumes it as a side effect.
  
  pp.eat = function (type) {
    if (this.type === type) {
      this.next();
      return true;
    } else {
      return false;
    }
  };
  
  // Tests whether parsed token is a contextual keyword.
  
  pp.isContextual = function (name) {
    return this.type === _tokentype.types.name && this.value === name;
  };
  
  // Consumes contextual keyword if possible.
  
  pp.eatContextual = function (name) {
    return this.value === name && this.eat(_tokentype.types.name);
  };
  
  // Asserts that following token is given contextual keyword.
  
  pp.expectContextual = function (name) {
    if (!this.eatContextual(name)) this.unexpected();
  };
  
  // Test whether a semicolon can be inserted at the current position.
  
  pp.canInsertSemicolon = function () {
    return this.type === _tokentype.types.eof || this.type === _tokentype.types.braceR || _whitespace.lineBreak.test(this.input.slice(this.lastTokEnd, this.start));
  };
  
  pp.insertSemicolon = function () {
    if (this.canInsertSemicolon()) {
      if (this.options.onInsertedSemicolon) this.options.onInsertedSemicolon(this.lastTokEnd, this.lastTokEndLoc);
      return true;
    }
  };
  
  // Consume a semicolon, or, failing that, see if we are allowed to
  // pretend that there is a semicolon at this position.
  
  pp.semicolon = function () {
    if (!this.eat(_tokentype.types.semi) && !this.insertSemicolon()) this.unexpected();
  };
  
  pp.afterTrailingComma = function (tokType) {
    if (this.type == tokType) {
      if (this.options.onTrailingComma) this.options.onTrailingComma(this.lastTokStart, this.lastTokStartLoc);
      this.next();
      return true;
    }
  };
  
  // Expect a token of a given type. If found, consume it, otherwise,
  // raise an unexpected token error.
  
  pp.expect = function (type) {
    this.eat(type) || this.unexpected();
  };
  
  // Raise an unexpected token error.
  
  pp.unexpected = function (pos) {
    this.raise(pos != null ? pos : this.start, "Unexpected token");
  };
  
  var DestructuringErrors = function DestructuringErrors() {
    _classCallCheck(this, DestructuringErrors);
  
    this.shorthandAssign = 0;
    this.trailingComma = 0;
  };
  
  exports.DestructuringErrors = DestructuringErrors;
  
  pp.checkPatternErrors = function (refDestructuringErrors, andThrow) {
    var trailing = refDestructuringErrors && refDestructuringErrors.trailingComma;
    if (!andThrow) return !!trailing;
    if (trailing) this.raise(trailing, "Comma is not permitted after the rest element");
  };
  
  pp.checkExpressionErrors = function (refDestructuringErrors, andThrow) {
    var pos = refDestructuringErrors && refDestructuringErrors.shorthandAssign;
    if (!andThrow) return !!pos;
    if (pos) this.raise(pos, "Shorthand property assignments are valid only in destructuring patterns");
  };
  
  },{"./state":10,"./tokentype":14,"./whitespace":16}],10:[function(_dereq_,module,exports){
  "use strict";
  
  exports.__esModule = true;
  
  function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
  
  var _identifier = _dereq_("./identifier");
  
  var _tokentype = _dereq_("./tokentype");
  
  var _whitespace = _dereq_("./whitespace");
  
  var _options = _dereq_("./options");
  
  // Registered plugins
  var plugins = {};
  
  exports.plugins = plugins;
  function keywordRegexp(words) {
    return new RegExp("^(" + words.replace(/ /g, "|") + ")$");
  }
  
  var Parser = (function () {
    function Parser(options, input, startPos) {
      _classCallCheck(this, Parser);
  
      this.options = options = _options.getOptions(options);
      this.sourceFile = options.sourceFile;
      this.keywords = keywordRegexp(_identifier.keywords[options.ecmaVersion >= 6 ? 6 : 5]);
      var reserved = options.allowReserved ? "" : _identifier.reservedWords[options.ecmaVersion] + (options.sourceType == "module" ? " await" : "");
      this.reservedWords = keywordRegexp(reserved);
      var reservedStrict = (reserved ? reserved + " " : "") + _identifier.reservedWords.strict;
      this.reservedWordsStrict = keywordRegexp(reservedStrict);
      this.reservedWordsStrictBind = keywordRegexp(reservedStrict + " " + _identifier.reservedWords.strictBind);
      this.input = String(input);
  
      // 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.
      this.containsEsc = false;
  
      // Load plugins
      this.loadPlugins(options.plugins);
  
      // Set up token state
  
      // The current position of the tokenizer in the input.
      if (startPos) {
        this.pos = startPos;
        this.lineStart = Math.max(0, this.input.lastIndexOf("\n", startPos));
        this.curLine = this.input.slice(0, this.lineStart).split(_whitespace.lineBreak).length;
      } else {
        this.pos = this.lineStart = 0;
        this.curLine = 1;
      }
  
      // Properties of the current token:
      // Its type
      this.type = _tokentype.types.eof;
      // For tokens that include more information than their type, the value
      this.value = null;
      // Its start and end offset
      this.start = this.end = this.pos;
      // And, if locations are used, the {line, column} object
      // corresponding to those offsets
      this.startLoc = this.endLoc = this.curPosition();
  
      // Position information for the previous token
      this.lastTokEndLoc = this.lastTokStartLoc = null;
      this.lastTokStart = this.lastTokEnd = this.pos;
  
      // The context stack is used to superficially track syntactic
      // context to predict whether a regular expression is allowed in a
      // given position.
      this.context = this.initialContext();
      this.exprAllowed = true;
  
      // Figure out if it's a module code.
      this.strict = this.inModule = options.sourceType === "module";
  
      // Used to signify the start of a potential arrow function
      this.potentialArrowAt = -1;
  
      // Flags to track whether we are in a function, a generator.
      this.inFunction = this.inGenerator = false;
      // Labels in scope.
      this.labels = [];
  
      // If enabled, skip leading hashbang line.
      if (this.pos === 0 && options.allowHashBang && this.input.slice(0, 2) === '#!') this.skipLineComment(2);
    }
  
    // DEPRECATED Kept for backwards compatibility until 3.0 in case a plugin uses them
  
    Parser.prototype.isKeyword = function isKeyword(word) {
      return this.keywords.test(word);
    };
  
    Parser.prototype.isReservedWord = function isReservedWord(word) {
      return this.reservedWords.test(word);
    };
  
    Parser.prototype.extend = function extend(name, f) {
      this[name] = f(this[name]);
    };
  
    Parser.prototype.loadPlugins = function loadPlugins(pluginConfigs) {
      for (var _name in pluginConfigs) {
        var plugin = plugins[_name];
        if (!plugin) throw new Error("Plugin '" + _name + "' not found");
        plugin(this, pluginConfigs[_name]);
      }
    };
  
    Parser.prototype.parse = function parse() {
      var node = this.options.program || this.startNode();
      this.nextToken();
      return this.parseTopLevel(node);
    };
  
    return Parser;
  })();
  
  exports.Parser = Parser;
  
  },{"./identifier":2,"./options":8,"./tokentype":14,"./whitespace":16}],11:[function(_dereq_,module,exports){
  "use strict";
  
  var _tokentype = _dereq_("./tokentype");
  
  var _state = _dereq_("./state");
  
  var _whitespace = _dereq_("./whitespace");
  
  var _identifier = _dereq_("./identifier");
  
  var _parseutil = _dereq_("./parseutil");
  
  var pp = _state.Parser.prototype;
  
  // ### 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.
  
  pp.parseTopLevel = function (node) {
    var first = true;
    if (!node.body) node.body = [];
    while (this.type !== _tokentype.types.eof) {
      var stmt = this.parseStatement(true, true);
      node.body.push(stmt);
      if (first) {
        if (this.isUseStrict(stmt)) this.setStrict(true);
        first = false;
      }
    }
    this.next();
    if (this.options.ecmaVersion >= 6) {
      node.sourceType = this.options.sourceType;
    }
    return this.finishNode(node, "Program");
  };
  
  var loopLabel = { kind: "loop" },
      switchLabel = { kind: "switch" };
  
  pp.isLet = function () {
    if (this.type !== _tokentype.types.name || this.options.ecmaVersion < 6 || this.value != "let") return false;
    _whitespace.skipWhiteSpace.lastIndex = this.pos;
    var skip = _whitespace.skipWhiteSpace.exec(this.input);
    var next = this.pos + skip[0].length,
        nextCh = this.input.charCodeAt(next);
    if (nextCh === 91 || nextCh == 123) return true; // '{' and '['
    if (_identifier.isIdentifierStart(nextCh, true)) {
      for (var pos = next + 1; _identifier.isIdentifierChar(this.input.charCodeAt(pos, true)); ++pos) {}
      var ident = this.input.slice(next, pos);
      if (!this.isKeyword(ident)) return true;
    }
    return false;
  };
  
  // 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.
  
  pp.parseStatement = function (declaration, topLevel) {
    var starttype = this.type,
        node = this.startNode(),
        kind = undefined;
  
    if (this.isLet()) {
      starttype = _tokentype.types._var;
      kind = "let";
    }
  
    // 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 _tokentype.types._break:case _tokentype.types._continue:
        return this.parseBreakContinueStatement(node, starttype.keyword);
      case _tokentype.types._debugger:
        return this.parseDebuggerStatement(node);
      case _tokentype.types._do:
        return this.parseDoStatement(node);
      case _tokentype.types._for:
        return this.parseForStatement(node);
      case _tokentype.types._function:
        if (!declaration && this.options.ecmaVersion >= 6) this.unexpected();
        return this.parseFunctionStatement(node);
      case _tokentype.types._class:
        if (!declaration) this.unexpected();
        return this.parseClass(node, true);
      case _tokentype.types._if:
        return this.parseIfStatement(node);
      case _tokentype.types._return:
        return this.parseReturnStatement(node);
      case _tokentype.types._switch:
        return this.parseSwitchStatement(node);
      case _tokentype.types._throw:
        return this.parseThrowStatement(node);
      case _tokentype.types._try:
        return this.parseTryStatement(node);
      case _tokentype.types._const:case _tokentype.types._var:
        kind = kind || this.value;
        if (!declaration && kind != "var") this.unexpected();
        return this.parseVarStatement(node, kind);
      case _tokentype.types._while:
        return this.parseWhileStatement(node);
      case _tokentype.types._with:
        return this.parseWithStatement(node);
      case _tokentype.types.braceL:
        return this.parseBlock();
      case _tokentype.types.semi:
        return this.parseEmptyStatement(node);
      case _tokentype.types._export:
      case _tokentype.types._import:
        if (!this.options.allowImportExportEverywhere) {
          if (!topLevel) this.raise(this.start, "'import' and 'export' may only appear at the top level");
          if (!this.inModule) this.raise(this.start, "'import' and 'export' may appear only with 'sourceType: module'");
        }
        return starttype === _tokentype.types._import ? this.parseImport(node) : this.parseExport(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 = this.value,
            expr = this.parseExpression();
        if (starttype === _tokentype.types.name && expr.type === "Identifier" && this.eat(_tokentype.types.colon)) return this.parseLabeledStatement(node, maybeName, expr);else return this.parseExpressionStatement(node, expr);
    }
  };
  
  pp.parseBreakContinueStatement = function (node, keyword) {
    var isBreak = keyword == "break";
    this.next();
    if (this.eat(_tokentype.types.semi) || this.insertSemicolon()) node.label = null;else if (this.type !== _tokentype.types.name) this.unexpected();else {
      node.label = this.parseIdent();
      this.semicolon();
    }
  
    // Verify that there is an actual destination to break or
    // continue to.
    for (var i = 0; i < this.labels.length; ++i) {
      var lab = this.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 === this.labels.length) this.raise(node.start, "Unsyntactic " + keyword);
    return this.finishNode(node, isBreak ? "BreakStatement" : "ContinueStatement");
  };
  
  pp.parseDebuggerStatement = function (node) {
    this.next();
    this.semicolon();
    return this.finishNode(node, "DebuggerStatement");
  };
  
  pp.parseDoStatement = function (node) {
    this.next();
    this.labels.push(loopLabel);
    node.body = this.parseStatement(false);
    this.labels.pop();
    this.expect(_tokentype.types._while);
    node.test = this.parseParenExpression();
    if (this.options.ecmaVersion >= 6) this.eat(_tokentype.types.semi);else this.semicolon();
    return this.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.
  
  pp.parseForStatement = function (node) {
    this.next();
    this.labels.push(loopLabel);
    this.expect(_tokentype.types.parenL);
    if (this.type === _tokentype.types.semi) return this.parseFor(node, null);
    var isLet = this.isLet();
    if (this.type === _tokentype.types._var || this.type === _tokentype.types._const || isLet) {
      var _init = this.startNode(),
          kind = isLet ? "let" : this.value;
      this.next();
      this.parseVar(_init, true, kind);
      this.finishNode(_init, "VariableDeclaration");
      if ((this.type === _tokentype.types._in || this.options.ecmaVersion >= 6 && this.isContextual("of")) && _init.declarations.length === 1 && !(kind !== "var" && _init.declarations[0].init)) return this.parseForIn(node, _init);
      return this.parseFor(node, _init);
    }
    var refDestructuringErrors = new _parseutil.DestructuringErrors();
    var init = this.parseExpression(true, refDestructuringErrors);
    if (this.type === _tokentype.types._in || this.options.ecmaVersion >= 6 && this.isContextual("of")) {
      this.checkPatternErrors(refDestructuringErrors, true);
      this.toAssignable(init);
      this.checkLVal(init);
      return this.parseForIn(node, init);
    } else {
      this.checkExpressionErrors(refDestructuringErrors, true);
    }
    return this.parseFor(node, init);
  };
  
  pp.parseFunctionStatement = function (node) {
    this.next();
    return this.parseFunction(node, true);
  };
  
  pp.parseIfStatement = function (node) {
    this.next();
    node.test = this.parseParenExpression();
    node.consequent = this.parseStatement(false);
    node.alternate = this.eat(_tokentype.types._else) ? this.parseStatement(false) : null;
    return this.finishNode(node, "IfStatement");
  };
  
  pp.parseReturnStatement = function (node) {
    if (!this.inFunction && !this.options.allowReturnOutsideFunction) this.raise(this.start, "'return' outside of function");
    this.next();
  
    // In `return` (and `break`/`continue`), the keywords with
    // optional arguments, we eagerly look for a semicolon or the
    // possibility to insert one.
  
    if (this.eat(_tokentype.types.semi) || this.insertSemicolon()) node.argument = null;else {
      node.argument = this.parseExpression();this.semicolon();
    }
    return this.finishNode(node, "ReturnStatement");
  };
  
  pp.parseSwitchStatement = function (node) {
    this.next();
    node.discriminant = this.parseParenExpression();
    node.cases = [];
    this.expect(_tokentype.types.braceL);
    this.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 = false; this.type != _tokentype.types.braceR;) {
      if (this.type === _tokentype.types._case || this.type === _tokentype.types._default) {
        var isCase = this.type === _tokentype.types._case;
        if (cur) this.finishNode(cur, "SwitchCase");
        node.cases.push(cur = this.startNode());
        cur.consequent = [];
        this.next();
        if (isCase) {
          cur.test = this.parseExpression();
        } else {
          if (sawDefault) this.raiseRecoverable(this.lastTokStart, "Multiple default clauses");
          sawDefault = true;
          cur.test = null;
        }
        this.expect(_tokentype.types.colon);
      } else {
        if (!cur) this.unexpected();
        cur.consequent.push(this.parseStatement(true));
      }
    }
    if (cur) this.finishNode(cur, "SwitchCase");
    this.next(); // Closing brace
    this.labels.pop();
    return this.finishNode(node, "SwitchStatement");
  };
  
  pp.parseThrowStatement = function (node) {
    this.next();
    if (_whitespace.lineBreak.test(this.input.slice(this.lastTokEnd, this.start))) this.raise(this.lastTokEnd, "Illegal newline after throw");
    node.argument = this.parseExpression();
    this.semicolon();
    return this.finishNode(node, "ThrowStatement");
  };
  
  // Reused empty array added for node fields that are always empty.
  
  var empty = [];
  
  pp.parseTryStatement = function (node) {
    this.next();
    node.block = this.parseBlock();
    node.handler = null;
    if (this.type === _tokentype.types._catch) {
      var clause = this.startNode();
      this.next();
      this.expect(_tokentype.types.parenL);
      clause.param = this.parseBindingAtom();
      this.checkLVal(clause.param, true);
      this.expect(_tokentype.types.parenR);
      clause.body = this.parseBlock();
      node.handler = this.finishNode(clause, "CatchClause");
    }
    node.finalizer = this.eat(_tokentype.types._finally) ? this.parseBlock() : null;
    if (!node.handler && !node.finalizer) this.raise(node.start, "Missing catch or finally clause");
    return this.finishNode(node, "TryStatement");
  };
  
  pp.parseVarStatement = function (node, kind) {
    this.next();
    this.parseVar(node, false, kind);
    this.semicolon();
    return this.finishNode(node, "VariableDeclaration");
  };
  
  pp.parseWhileStatement = function (node) {
    this.next();
    node.test = this.parseParenExpression();
    this.labels.push(loopLabel);
    node.body = this.parseStatement(false);
    this.labels.pop();
    return this.finishNode(node, "WhileStatement");
  };
  
  pp.parseWithStatement = function (node) {
    if (this.strict) this.raise(this.start, "'with' in strict mode");
    this.next();
    node.object = this.parseParenExpression();
    node.body = this.parseStatement(false);
    return this.finishNode(node, "WithStatement");
  };
  
  pp.parseEmptyStatement = function (node) {
    this.next();
    return this.finishNode(node, "EmptyStatement");
  };
  
  pp.parseLabeledStatement = function (node, maybeName, expr) {
    for (var i = 0; i < this.labels.length; ++i) {
      if (this.labels[i].name === maybeName) this.raise(expr.start, "Label '" + maybeName + "' is already declared");
    }var kind = this.type.isLoop ? "loop" : this.type === _tokentype.types._switch ? "switch" : null;
    for (var i = this.labels.length - 1; i >= 0; i--) {
      var label = this.labels[i];
      if (label.statementStart == node.start) {
        label.statementStart = this.start;
        label.kind = kind;
      } else break;
    }
    this.labels.push({ name: maybeName, kind: kind, statementStart: this.start });
    node.body = this.parseStatement(true);
    this.labels.pop();
    node.label = expr;
    return this.finishNode(node, "LabeledStatement");
  };
  
  pp.parseExpressionStatement = function (node, expr) {
    node.expression = expr;
    this.semicolon();
    return this.finishNode(node, "ExpressionStatement");
  };
  
  // Parse a semicolon-enclosed block of statements, handling `"use
  // strict"` declarations when `allowStrict` is true (used for
  // function bodies).
  
  pp.parseBlock = function (allowStrict) {
    var node = this.startNode(),
        first = true,
        oldStrict = undefined;
    node.body = [];
    this.expect(_tokentype.types.braceL);
    while (!this.eat(_tokentype.types.braceR)) {
      var stmt = this.parseStatement(true);
      node.body.push(stmt);
      if (first && allowStrict && this.isUseStrict(stmt)) {
        oldStrict = this.strict;
        this.setStrict(this.strict = true);
      }
      first = false;
    }
    if (oldStrict === false) this.setStrict(false);
    return this.finishNode(node, "BlockStatement");
  };
  
  // Parse a regular `for` loop. The disambiguation code in
  // `parseStatement` will already have parsed the init statement or
  // expression.
  
  pp.parseFor = function (node, init) {
    node.init = init;
    this.expect(_tokentype.types.semi);
    node.test = this.type === _tokentype.types.semi ? null : this.parseExpression();
    this.expect(_tokentype.types.semi);
    node.update = this.type === _tokentype.types.parenR ? null : this.parseExpression();
    this.expect(_tokentype.types.parenR);
    node.body = this.parseStatement(false);
    this.labels.pop();
    return this.finishNode(node, "ForStatement");
  };
  
  // Parse a `for`/`in` and `for`/`of` loop, which are almost
  // same from parser's perspective.
  
  pp.parseForIn = function (node, init) {
    var type = this.type === _tokentype.types._in ? "ForInStatement" : "ForOfStatement";
    this.next();
    node.left = init;
    node.right = this.parseExpression();
    this.expect(_tokentype.types.parenR);
    node.body = this.parseStatement(false);
    this.labels.pop();
    return this.finishNode(node, type);
  };
  
  // Parse a list of variable declarations.
  
  pp.parseVar = function (node, isFor, kind) {
    node.declarations = [];
    node.kind = kind;
    for (;;) {
      var decl = this.startNode();
      this.parseVarId(decl);
      if (this.eat(_tokentype.types.eq)) {
        decl.init = this.parseMaybeAssign(isFor);
      } else if (kind === "const" && !(this.type === _tokentype.types._in || this.options.ecmaVersion >= 6 && this.isContextual("of"))) {
        this.unexpected();
      } else if (decl.id.type != "Identifier" && !(isFor && (this.type === _tokentype.types._in || this.isContextual("of")))) {
        this.raise(this.lastTokEnd, "Complex binding patterns require an initialization value");
      } else {
        decl.init = null;
      }
      node.declarations.push(this.finishNode(decl, "VariableDeclarator"));
      if (!this.eat(_tokentype.types.comma)) break;
    }
    return node;
  };
  
  pp.parseVarId = function (decl) {
    decl.id = this.parseBindingAtom();
    this.checkLVal(decl.id, true);
  };
  
  // Parse a function declaration or literal (depending on the
  // `isStatement` parameter).
  
  pp.parseFunction = function (node, isStatement, allowExpressionBody) {
    this.initFunction(node);
    if (this.options.ecmaVersion >= 6) node.generator = this.eat(_tokentype.types.star);
    var oldInGen = this.inGenerator;
    this.inGenerator = node.generator;
    if (isStatement || this.type === _tokentype.types.name) node.id = this.parseIdent();
    this.parseFunctionParams(node);
    this.parseFunctionBody(node, allowExpressionBody);
    this.inGenerator = oldInGen;
    return this.finishNode(node, isStatement ? "FunctionDeclaration" : "FunctionExpression");
  };
  
  pp.parseFunctionParams = function (node) {
    this.expect(_tokentype.types.parenL);
    node.params = this.parseBindingList(_tokentype.types.parenR, false, false, true);
  };
  
  // Parse a class declaration or literal (depending on the
  // `isStatement` parameter).
  
  pp.parseClass = function (node, isStatement) {
    this.next();
    this.parseClassId(node, isStatement);
    this.parseClassSuper(node);
    var classBody = this.startNode();
    var hadConstructor = false;
    classBody.body = [];
    this.expect(_tokentype.types.braceL);
    while (!this.eat(_tokentype.types.braceR)) {
      if (this.eat(_tokentype.types.semi)) continue;
      var method = this.startNode();
      var isGenerator = this.eat(_tokentype.types.star);
      var isMaybeStatic = this.type === _tokentype.types.name && this.value === "static";
      this.parsePropertyName(method);
      method["static"] = isMaybeStatic && this.type !== _tokentype.types.parenL;
      if (method["static"]) {
        if (isGenerator) this.unexpected();
        isGenerator = this.eat(_tokentype.types.star);
        this.parsePropertyName(method);
      }
      method.kind = "method";
      var isGetSet = false;
      if (!method.computed) {
        var key = method.key;
  
        if (!isGenerator && key.type === "Identifier" && this.type !== _tokentype.types.parenL && (key.name === "get" || key.name === "set")) {
          isGetSet = true;
          method.kind = key.name;
          key = this.parsePropertyName(method);
        }
        if (!method["static"] && (key.type === "Identifier" && key.name === "constructor" || key.type === "Literal" && key.value === "constructor")) {
          if (hadConstructor) this.raise(key.start, "Duplicate constructor in the same class");
          if (isGetSet) this.raise(key.start, "Constructor can't have get/set modifier");
          if (isGenerator) this.raise(key.start, "Constructor can't be a generator");
          method.kind = "constructor";
          hadConstructor = true;
        }
      }
      this.parseClassMethod(classBody, method, isGenerator);
      if (isGetSet) {
        var paramCount = method.kind === "get" ? 0 : 1;
        if (method.value.params.length !== paramCount) {
          var start = method.value.start;
          if (method.kind === "get") this.raiseRecoverable(start, "getter should have no params");else this.raiseRecoverable(start, "setter should have exactly one param");
        }
        if (method.kind === "set" && method.value.params[0].type === "RestElement") this.raise(method.value.params[0].start, "Setter cannot use rest params");
      }
    }
    node.body = this.finishNode(classBody, "ClassBody");
    return this.finishNode(node, isStatement ? "ClassDeclaration" : "ClassExpression");
  };
  
  pp.parseClassMethod = function (classBody, method, isGenerator) {
    method.value = this.parseMethod(isGenerator);
    classBody.body.push(this.finishNode(method, "MethodDefinition"));
  };
  
  pp.parseClassId = function (node, isStatement) {
    node.id = this.type === _tokentype.types.name ? this.parseIdent() : isStatement ? this.unexpected() : null;
  };
  
  pp.parseClassSuper = function (node) {
    node.superClass = this.eat(_tokentype.types._extends) ? this.parseExprSubscripts() : null;
  };
  
  // Parses module export declaration.
  
  pp.parseExport = function (node) {
    this.next();
    // export * from '...'
    if (this.eat(_tokentype.types.star)) {
      this.expectContextual("from");
      node.source = this.type === _tokentype.types.string ? this.parseExprAtom() : this.unexpected();
      this.semicolon();
      return this.finishNode(node, "ExportAllDeclaration");
    }
    if (this.eat(_tokentype.types._default)) {
      // export default ...
      var parens = this.type == _tokentype.types.parenL;
      var expr = this.parseMaybeAssign();
      var needsSemi = true;
      if (!parens && (expr.type == "FunctionExpression" || expr.type == "ClassExpression")) {
        needsSemi = false;
        if (expr.id) {
          expr.type = expr.type == "FunctionExpression" ? "FunctionDeclaration" : "ClassDeclaration";
        }
      }
      node.declaration = expr;
      if (needsSemi) this.semicolon();
      return this.finishNode(node, "ExportDefaultDeclaration");
    }
    // export var|const|let|function|class ...
    if (this.shouldParseExportStatement()) {
      node.declaration = this.parseStatement(true);
      node.specifiers = [];
      node.source = null;
    } else {
      // export { x, y as z } [from '...']
      node.declaration = null;
      node.specifiers = this.parseExportSpecifiers();
      if (this.eatContextual("from")) {
        node.source = this.type === _tokentype.types.string ? this.parseExprAtom() : this.unexpected();
      } else {
        // check for keywords used as local names
        for (var i = 0; i < node.specifiers.length; i++) {
          if (this.keywords.test(node.specifiers[i].local.name) || this.reservedWords.test(node.specifiers[i].local.name)) {
            this.unexpected(node.specifiers[i].local.start);
          }
        }
  
        node.source = null;
      }
      this.semicolon();
    }
    return this.finishNode(node, "ExportNamedDeclaration");
  };
  
  pp.shouldParseExportStatement = function () {
    return this.type.keyword || this.isLet();
  };
  
  // Parses a comma-separated list of module exports.
  
  pp.parseExportSpecifiers = function () {
    var nodes = [],
        first = true;
    // export { x, y as z } [from '...']
    this.expect(_tokentype.types.braceL);
    while (!this.eat(_tokentype.types.braceR)) {
      if (!first) {
        this.expect(_tokentype.types.comma);
        if (this.afterTrailingComma(_tokentype.types.braceR)) break;
      } else first = false;
  
      var node = this.startNode();
      node.local = this.parseIdent(this.type === _tokentype.types._default);
      node.exported = this.eatContextual("as") ? this.parseIdent(true) : node.local;
      nodes.push(this.finishNode(node, "ExportSpecifier"));
    }
    return nodes;
  };
  
  // Parses import declaration.
  
  pp.parseImport = function (node) {
    this.next();
    // import '...'
    if (this.type === _tokentype.types.string) {
      node.specifiers = empty;
      node.source = this.parseExprAtom();
    } else {
      node.specifiers = this.parseImportSpecifiers();
      this.expectContextual("from");
      node.source = this.type === _tokentype.types.string ? this.parseExprAtom() : this.unexpected();
    }
    this.semicolon();
    return this.finishNode(node, "ImportDeclaration");
  };
  
  // Parses a comma-separated list of module imports.
  
  pp.parseImportSpecifiers = function () {
    var nodes = [],
        first = true;
    if (this.type === _tokentype.types.name) {
      // import defaultObj, { x, y as z } from '...'
      var node = this.startNode();
      node.local = this.parseIdent();
      this.checkLVal(node.local, true);
      nodes.push(this.finishNode(node, "ImportDefaultSpecifier"));
      if (!this.eat(_tokentype.types.comma)) return nodes;
    }
    if (this.type === _tokentype.types.star) {
      var node = this.startNode();
      this.next();
      this.expectContextual("as");
      node.local = this.parseIdent();
      this.checkLVal(node.local, true);
      nodes.push(this.finishNode(node, "ImportNamespaceSpecifier"));
      return nodes;
    }
    this.expect(_tokentype.types.braceL);
    while (!this.eat(_tokentype.types.braceR)) {
      if (!first) {
        this.expect(_tokentype.types.comma);
        if (this.afterTrailingComma(_tokentype.types.braceR)) break;
      } else first = false;
  
      var node = this.startNode();
      node.imported = this.parseIdent(true);
      if (this.eatContextual("as")) {
        node.local = this.parseIdent();
      } else {
        node.local = node.imported;
        if (this.isKeyword(node.local.name)) this.unexpected(node.local.start);
        if (this.reservedWordsStrict.test(node.local.name)) this.raise(node.local.start, "The keyword '" + node.local.name + "' is reserved");
      }
      this.checkLVal(node.local, true);
      nodes.push(this.finishNode(node, "ImportSpecifier"));
    }
    return nodes;
  };
  
  },{"./identifier":2,"./parseutil":9,"./state":10,"./tokentype":14,"./whitespace":16}],12:[function(_dereq_,module,exports){
  // The algorithm used to determine whether a regexp can appear at a
  // given point in the program is loosely based on sweet.js' approach.
  // See https://github.com/mozilla/sweet.js/wiki/design
  
  "use strict";
  
  exports.__esModule = true;
  
  function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
  
  var _state = _dereq_("./state");
  
  var _tokentype = _dereq_("./tokentype");
  
  var _whitespace = _dereq_("./whitespace");
  
  var TokContext = function TokContext(token, isExpr, preserveSpace, override) {
    _classCallCheck(this, TokContext);
  
    this.token = token;
    this.isExpr = !!isExpr;
    this.preserveSpace = !!preserveSpace;
    this.override = override;
  };
  
  exports.TokContext = TokContext;
  var types = {
    b_stat: new TokContext("{", false),
    b_expr: new TokContext("{", true),
    b_tmpl: new TokContext("${", true),
    p_stat: new TokContext("(", false),
    p_expr: new TokContext("(", true),
    q_tmpl: new TokContext("`", true, true, function (p) {
      return p.readTmplToken();
    }),
    f_expr: new TokContext("function", true)
  };
  
  exports.types = types;
  var pp = _state.Parser.prototype;
  
  pp.initialContext = function () {
    return [types.b_stat];
  };
  
  pp.braceIsBlock = function (prevType) {
    if (prevType === _tokentype.types.colon) {
      var _parent = this.curContext();
      if (_parent === types.b_stat || _parent === types.b_expr) return !_parent.isExpr;
    }
    if (prevType === _tokentype.types._return) return _whitespace.lineBreak.test(this.input.slice(this.lastTokEnd, this.start));
    if (prevType === _tokentype.types._else || prevType === _tokentype.types.semi || prevType === _tokentype.types.eof || prevType === _tokentype.types.parenR) return true;
    if (prevType == _tokentype.types.braceL) return this.curContext() === types.b_stat;
    return !this.exprAllowed;
  };
  
  pp.updateContext = function (prevType) {
    var update = undefined,
        type = this.type;
    if (type.keyword && prevType == _tokentype.types.dot) this.exprAllowed = false;else if (update = type.updateContext) update.call(this, prevType);else this.exprAllowed = type.beforeExpr;
  };
  
  // Token-specific context update code
  
  _tokentype.types.parenR.updateContext = _tokentype.types.braceR.updateContext = function () {
    if (this.context.length == 1) {
      this.exprAllowed = true;
      return;
    }
    var out = this.context.pop();
    if (out === types.b_stat && this.curContext() === types.f_expr) {
      this.context.pop();
      this.exprAllowed = false;
    } else if (out === types.b_tmpl) {
      this.exprAllowed = true;
    } else {
      this.exprAllowed = !out.isExpr;
    }
  };
  
  _tokentype.types.braceL.updateContext = function (prevType) {
    this.context.push(this.braceIsBlock(prevType) ? types.b_stat : types.b_expr);
    this.exprAllowed = true;
  };
  
  _tokentype.types.dollarBraceL.updateContext = function () {
    this.context.push(types.b_tmpl);
    this.exprAllowed = true;
  };
  
  _tokentype.types.parenL.updateContext = function (prevType) {
    var statementParens = prevType === _tokentype.types._if || prevType === _tokentype.types._for || prevType === _tokentype.types._with || prevType === _tokentype.types._while;
    this.context.push(statementParens ? types.p_stat : types.p_expr);
    this.exprAllowed = true;
  };
  
  _tokentype.types.incDec.updateContext = function () {
    // tokExprAllowed stays unchanged
  };
  
  _tokentype.types._function.updateContext = function (prevType) {
    if (prevType.beforeExpr && prevType !== _tokentype.types.semi && prevType !== _tokentype.types._else && (prevType !== _tokentype.types.colon || this.curContext() !== types.b_stat)) this.context.push(types.f_expr);
    this.exprAllowed = false;
  };
  
  _tokentype.types.backQuote.updateContext = function () {
    if (this.curContext() === types.q_tmpl) this.context.pop();else this.context.push(types.q_tmpl);
    this.exprAllowed = false;
  };
  
  },{"./state":10,"./tokentype":14,"./whitespace":16}],13:[function(_dereq_,module,exports){
  "use strict";
  
  exports.__esModule = true;
  
  function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
  
  var _identifier = _dereq_("./identifier");
  
  var _tokentype = _dereq_("./tokentype");
  
  var _state = _dereq_("./state");
  
  var _locutil = _dereq_("./locutil");
  
  var _whitespace = _dereq_("./whitespace");
  
  // Object type used to represent tokens. Note that normally, tokens
  // simply exist as properties on the parser object. This is only
  // used for the onToken callback and the external tokenizer.
  
  var Token = function Token(p) {
    _classCallCheck(this, Token);
  
    this.type = p.type;
    this.value = p.value;
    this.start = p.start;
    this.end = p.end;
    if (p.options.locations) this.loc = new _locutil.SourceLocation(p, p.startLoc, p.endLoc);
    if (p.options.ranges) this.range = [p.start, p.end];
  }
  
  // ## Tokenizer
  
  ;
  
  exports.Token = Token;
  var pp = _state.Parser.prototype;
  
  // Are we running under Rhino?
  var isRhino = typeof Packages == "object" && Object.prototype.toString.call(Packages) == "[object JavaPackage]";
  
  // Move to the next token
  
  pp.next = function () {
    if (this.options.onToken) this.options.onToken(new Token(this));
  
    this.lastTokEnd = this.end;
    this.lastTokStart = this.start;
    this.lastTokEndLoc = this.endLoc;
    this.lastTokStartLoc = this.startLoc;
    this.nextToken();
  };
  
  pp.getToken = function () {
    this.next();
    return new Token(this);
  };
  
  // If we're in an ES6 environment, make parsers iterable
  if (typeof Symbol !== "undefined") pp[Symbol.iterator] = function () {
    var self = this;
    return { next: function next() {
        var token = self.getToken();
        return {
          done: token.type === _tokentype.types.eof,
          value: token
        };
      } };
  };
  
  // Toggle strict mode. Re-reads the next number or string to please
  // pedantic tests (`"use strict"; 010;` should fail).
  
  pp.setStrict = function (strict) {
    this.strict = strict;
    if (this.type !== _tokentype.types.num && this.type !== _tokentype.types.string) return;
    this.pos = this.start;
    if (this.options.locations) {
      while (this.pos < this.lineStart) {
        this.lineStart = this.input.lastIndexOf("\n", this.lineStart - 2) + 1;
        --this.curLine;
      }
    }
    this.nextToken();
  };
  
  pp.curContext = function () {
    return this.context[this.context.length - 1];
  };
  
  // Read a single token, updating the parser object's token-related
  // properties.
  
  pp.nextToken = function () {
    var curContext = this.curContext();
    if (!curContext || !curContext.preserveSpace) this.skipSpace();
  
    this.start = this.pos;
    if (this.options.locations) this.startLoc = this.curPosition();
    if (this.pos >= this.input.length) return this.finishToken(_tokentype.types.eof);
  
    if (curContext.override) return curContext.override(this);else this.readToken(this.fullCharCodeAtPos());
  };
  
  pp.readToken = function (code) {
    // Identifier or keyword. '\uXXXX' sequences are allowed in
    // identifiers, so '\' also dispatches to that.
    if (_identifier.isIdentifierStart(code, this.options.ecmaVersion >= 6) || code === 92 /* '\' */) return this.readWord();
  
    return this.getTokenFromCode(code);
  };
  
  pp.fullCharCodeAtPos = function () {
    var code = this.input.charCodeAt(this.pos);
    if (code <= 0xd7ff || code >= 0xe000) return code;
    var next = this.input.charCodeAt(this.pos + 1);
    return (code << 10) + next - 0x35fdc00;
  };
  
  pp.skipBlockComment = function () {
    var startLoc = this.options.onComment && this.curPosition();
    var start = this.pos,
        end = this.input.indexOf("*/", this.pos += 2);
    if (end === -1) this.raise(this.pos - 2, "Unterminated comment");
    this.pos = end + 2;
    if (this.options.locations) {
      _whitespace.lineBreakG.lastIndex = start;
      var match = undefined;
      while ((match = _whitespace.lineBreakG.exec(this.input)) && match.index < this.pos) {
        ++this.curLine;
        this.lineStart = match.index + match[0].length;
      }
    }
    if (this.options.onComment) this.options.onComment(true, this.input.slice(start + 2, end), start, this.pos, startLoc, this.curPosition());
  };
  
  pp.skipLineComment = function (startSkip) {
    var start = this.pos;
    var startLoc = this.options.onComment && this.curPosition();
    var ch = this.input.charCodeAt(this.pos += startSkip);
    while (this.pos < this.input.length && ch !== 10 && ch !== 13 && ch !== 8232 && ch !== 8233) {
      ++this.pos;
      ch = this.input.charCodeAt(this.pos);
    }
    if (this.options.onComment) this.options.onComment(false, this.input.slice(start + startSkip, this.pos), start, this.pos, startLoc, this.curPosition());
  };
  
  // Called at the start of the parse and after every token. Skips
  // whitespace and comments, and.
  
  pp.skipSpace = function () {
    loop: while (this.pos < this.input.length) {
      var ch = this.input.charCodeAt(this.pos);
      switch (ch) {
        case 32:case 160:
          // ' '
          ++this.pos;
          break;
        case 13:
          if (this.input.charCodeAt(this.pos + 1) === 10) {
            ++this.pos;
          }
        case 10:case 8232:case 8233:
          ++this.pos;
          if (this.options.locations) {
            ++this.curLine;
            this.lineStart = this.pos;
          }
          break;
        case 47:
          // '/'
          switch (this.input.charCodeAt(this.pos + 1)) {
            case 42:
              // '*'
              this.skipBlockComment();
              break;
            case 47:
              this.skipLineComment(2);
              break;
            default:
              break loop;
          }
          break;
        default:
          if (ch > 8 && ch < 14 || ch >= 5760 && _whitespace.nonASCIIwhitespace.test(String.fromCharCode(ch))) {
            ++this.pos;
          } else {
            break loop;
          }
      }
    }
  };
  
  // Called at the end of every token. Sets `end`, `val`, and
  // maintains `context` and `exprAllowed`, and skips the space after
  // the token, so that the next one's `start` will point at the
  // right position.
  
  pp.finishToken = function (type, val) {
    this.end = this.pos;
    if (this.options.locations) this.endLoc = this.curPosition();
    var prevType = this.type;
    this.type = type;
    this.value = val;
  
    this.updateContext(prevType);
  };
  
  // ### 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.
  //
  pp.readToken_dot = function () {
    var next = this.input.charCodeAt(this.pos + 1);
    if (next >= 48 && next <= 57) return this.readNumber(true);
    var next2 = this.input.charCodeAt(this.pos + 2);
    if (this.options.ecmaVersion >= 6 && next === 46 && next2 === 46) {
      // 46 = dot '.'
      this.pos += 3;
      return this.finishToken(_tokentype.types.ellipsis);
    } else {
      ++this.pos;
      return this.finishToken(_tokentype.types.dot);
    }
  };
  
  pp.readToken_slash = function () {
    // '/'
    var next = this.input.charCodeAt(this.pos + 1);
    if (this.exprAllowed) {
      ++this.pos;return this.readRegexp();
    }
    if (next === 61) return this.finishOp(_tokentype.types.assign, 2);
    return this.finishOp(_tokentype.types.slash, 1);
  };
  
  pp.readToken_mult_modulo_exp = function (code) {
    // '%*'
    var next = this.input.charCodeAt(this.pos + 1);
    var size = 1;
    var tokentype = code === 42 ? _tokentype.types.star : _tokentype.types.modulo;
  
    // exponentiation operator ** and **=
    if (this.options.ecmaVersion >= 7 && next === 42) {
      ++size;
      tokentype = _tokentype.types.starstar;
      next = this.input.charCodeAt(this.pos + 2);
    }
  
    if (next === 61) return this.finishOp(_tokentype.types.assign, size + 1);
    return this.finishOp(tokentype, size);
  };
  
  pp.readToken_pipe_amp = function (code) {
    // '|&'
    var next = this.input.charCodeAt(this.pos + 1);
    if (next === code) return this.finishOp(code === 124 ? _tokentype.types.logicalOR : _tokentype.types.logicalAND, 2);
    if (next === 61) return this.finishOp(_tokentype.types.assign, 2);
    return this.finishOp(code === 124 ? _tokentype.types.bitwiseOR : _tokentype.types.bitwiseAND, 1);
  };
  
  pp.readToken_caret = function () {
    // '^'
    var next = this.input.charCodeAt(this.pos + 1);
    if (next === 61) return this.finishOp(_tokentype.types.assign, 2);
    return this.finishOp(_tokentype.types.bitwiseXOR, 1);
  };
  
  pp.readToken_plus_min = function (code) {
    // '+-'
    var next = this.input.charCodeAt(this.pos + 1);
    if (next === code) {
      if (next == 45 && this.input.charCodeAt(this.pos + 2) == 62 && _whitespace.lineBreak.test(this.input.slice(this.lastTokEnd, this.pos))) {
        // A `-->` line comment
        this.skipLineComment(3);
        this.skipSpace();
        return this.nextToken();
      }
      return this.finishOp(_tokentype.types.incDec, 2);
    }
    if (next === 61) return this.finishOp(_tokentype.types.assign, 2);
    return this.finishOp(_tokentype.types.plusMin, 1);
  };
  
  pp.readToken_lt_gt = function (code) {
    // '<>'
    var next = this.input.charCodeAt(this.pos + 1);
    var size = 1;
    if (next === code) {
      size = code === 62 && this.input.charCodeAt(this.pos + 2) === 62 ? 3 : 2;
      if (this.input.charCodeAt(this.pos + size) === 61) return this.finishOp(_tokentype.types.assign, size + 1);
      return this.finishOp(_tokentype.types.bitShift, size);
    }
    if (next == 33 && code == 60 && this.input.charCodeAt(this.pos + 2) == 45 && this.input.charCodeAt(this.pos + 3) == 45) {
      if (this.inModule) this.unexpected();
      // `<!--`, an XML-style comment that should be interpreted as a line comment
      this.skipLineComment(4);
      this.skipSpace();
      return this.nextToken();
    }
    if (next === 61) size = 2;
    return this.finishOp(_tokentype.types.relational, size);
  };
  
  pp.readToken_eq_excl = function (code) {
    // '=!'
    var next = this.input.charCodeAt(this.pos + 1);
    if (next === 61) return this.finishOp(_tokentype.types.equality, this.input.charCodeAt(this.pos + 2) === 61 ? 3 : 2);
    if (code === 61 && next === 62 && this.options.ecmaVersion >= 6) {
      // '=>'
      this.pos += 2;
      return this.finishToken(_tokentype.types.arrow);
    }
    return this.finishOp(code === 61 ? _tokentype.types.eq : _tokentype.types.prefix, 1);
  };
  
  pp.getTokenFromCode = function (code) {
    switch (code) {
      // The interpretation of a dot depends on whether it is followed
      // by a digit or another two dots.
      case 46:
        // '.'
        return this.readToken_dot();
  
      // Punctuation tokens.
      case 40:
        ++this.pos;return this.finishToken(_tokentype.types.parenL);
      case 41:
        ++this.pos;return this.finishToken(_tokentype.types.parenR);
      case 59:
        ++this.pos;return this.finishToken(_tokentype.types.semi);
      case 44:
        ++this.pos;return this.finishToken(_tokentype.types.comma);
      case 91:
        ++this.pos;return this.finishToken(_tokentype.types.bracketL);
      case 93:
        ++this.pos;return this.finishToken(_tokentype.types.bracketR);
      case 123:
        ++this.pos;return this.finishToken(_tokentype.types.braceL);
      case 125:
        ++this.pos;return this.finishToken(_tokentype.types.braceR);
      case 58:
        ++this.pos;return this.finishToken(_tokentype.types.colon);
      case 63:
        ++this.pos;return this.finishToken(_tokentype.types.question);
  
      case 96:
        // '`'
        if (this.options.ecmaVersion < 6) break;
        ++this.pos;
        return this.finishToken(_tokentype.types.backQuote);
  
      case 48:
        // '0'
        var next = this.input.charCodeAt(this.pos + 1);
        if (next === 120 || next === 88) return this.readRadixNumber(16); // '0x', '0X' - hex number
        if (this.options.ecmaVersion >= 6) {
          if (next === 111 || next === 79) return this.readRadixNumber(8); // '0o', '0O' - octal number
          if (next === 98 || next === 66) return this.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 this.readNumber(false);
  
      // Quotes produce strings.
      case 34:case 39:
        // '"', "'"
        return this.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 this.readToken_slash();
  
      case 37:case 42:
        // '%*'
        return this.readToken_mult_modulo_exp(code);
  
      case 124:case 38:
        // '|&'
        return this.readToken_pipe_amp(code);
  
      case 94:
        // '^'
        return this.readToken_caret();
  
      case 43:case 45:
        // '+-'
        return this.readToken_plus_min(code);
  
      case 60:case 62:
        // '<>'
        return this.readToken_lt_gt(code);
  
      case 61:case 33:
        // '=!'
        return this.readToken_eq_excl(code);
  
      case 126:
        // '~'
        return this.finishOp(_tokentype.types.prefix, 1);
    }
  
    this.raise(this.pos, "Unexpected character '" + codePointToString(code) + "'");
  };
  
  pp.finishOp = function (type, size) {
    var str = this.input.slice(this.pos, this.pos + size);
    this.pos += size;
    return this.finishToken(type, str);
  };
  
  // Parse a regular expression. Some context-awareness is necessary,
  // since a '/' inside a '[]' set does not end the expression.
  
  function tryCreateRegexp(src, flags, throwErrorAt, parser) {
    try {
      return new RegExp(src, flags);
    } catch (e) {
      if (throwErrorAt !== undefined) {
        if (e instanceof SyntaxError) parser.raise(throwErrorAt, "Error parsing regular expression: " + e.message);
        throw e;
      }
    }
  }
  
  var regexpUnicodeSupport = !!tryCreateRegexp("", "u");
  
  pp.readRegexp = function () {
    var _this = this;
  
    var escaped = undefined,
        inClass = undefined,
        start = this.pos;
    for (;;) {
      if (this.pos >= this.input.length) this.raise(start, "Unterminated regular expression");
      var ch = this.input.charAt(this.pos);
      if (_whitespace.lineBreak.test(ch)) this.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;
      ++this.pos;
    }
    var content = this.input.slice(start, this.pos);
    ++this.pos;
    // Need to use `readWord1` because '\uXXXX' sequences are allowed
    // here (don't ask).
    var mods = this.readWord1();
    var tmp = content,
        tmpFlags = "";
    if (mods) {
      var validFlags = /^[gim]*$/;
      if (this.options.ecmaVersion >= 6) validFlags = /^[gimuy]*$/;
      if (!validFlags.test(mods)) this.raise(start, "Invalid regular expression flag");
      if (mods.indexOf("u") >= 0) {
        if (regexpUnicodeSupport) {
          tmpFlags = "u";
        } else {
          // Replace each astral symbol and every Unicode escape sequence that
          // possibly represents an astral symbol or a paired surrogate with a
          // single ASCII symbol to avoid throwing on regular expressions that
          // are only valid in combination with the `/u` flag.
          // Note: replacing with the ASCII symbol `x` might cause false
          // negatives in unlikely scenarios. For example, `[\u{61}-b]` is a
          // perfectly valid pattern that is equivalent to `[a-b]`, but it would
          // be replaced by `[x-b]` which throws an error.
          tmp = tmp.replace(/\\u\{([0-9a-fA-F]+)\}/g, function (_match, code, offset) {
            code = Number("0x" + code);
            if (code > 0x10FFFF) _this.raise(start + offset + 3, "Code point out of bounds");
            return "x";
          });
          tmp = tmp.replace(/\\u([a-fA-F0-9]{4})|[\uD800-\uDBFF][\uDC00-\uDFFF]/g, "x");
          tmpFlags = tmpFlags.replace("u", "");
        }
      }
    }
    // Detect invalid regular expressions.
    var value = null;
    // Rhino's regular expression parser is flaky and throws uncatchable exceptions,
    // so don't do detection if we are running under Rhino
    if (!isRhino) {
      tryCreateRegexp(tmp, tmpFlags, start, this);
      // Get a regular expression object for this pattern-flag pair, or `null` in
      // case the current environment doesn't support the flags it uses.
      value = tryCreateRegexp(content, mods);
    }
    return this.finishToken(_tokentype.types.regexp, { pattern: content, flags: mods, value: 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.
  
  pp.readInt = function (radix, len) {
    var start = this.pos,
        total = 0;
    for (var i = 0, e = len == null ? Infinity : len; i < e; ++i) {
      var code = this.input.charCodeAt(this.pos),
          val = undefined;
      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;
      ++this.pos;
      total = total * radix + val;
    }
    if (this.pos === start || len != null && this.pos - start !== len) return null;
  
    return total;
  };
  
  pp.readRadixNumber = function (radix) {
    this.pos += 2; // 0x
    var val = this.readInt(radix);
    if (val == null) this.raise(this.start + 2, "Expected number in radix " + radix);
    if (_identifier.isIdentifierStart(this.fullCharCodeAtPos())) this.raise(this.pos, "Identifier directly after number");
    return this.finishToken(_tokentype.types.num, val);
  };
  
  // Read an integer, octal integer, or floating-point number.
  
  pp.readNumber = function (startsWithDot) {
    var start = this.pos,
        isFloat = false,
        octal = this.input.charCodeAt(this.pos) === 48;
    if (!startsWithDot && this.readInt(10) === null) this.raise(start, "Invalid number");
    var next = this.input.charCodeAt(this.pos);
    if (next === 46) {
      // '.'
      ++this.pos;
      this.readInt(10);
      isFloat = true;
      next = this.input.charCodeAt(this.pos);
    }
    if (next === 69 || next === 101) {
      // 'eE'
      next = this.input.charCodeAt(++this.pos);
      if (next === 43 || next === 45) ++this.pos; // '+-'
      if (this.readInt(10) === null) this.raise(start, "Invalid number");
      isFloat = true;
    }
    if (_identifier.isIdentifierStart(this.fullCharCodeAtPos())) this.raise(this.pos, "Identifier directly after number");
  
    var str = this.input.slice(start, this.pos),
        val = undefined;
    if (isFloat) val = parseFloat(str);else if (!octal || str.length === 1) val = parseInt(str, 10);else if (/[89]/.test(str) || this.strict) this.raise(start, "Invalid number");else val = parseInt(str, 8);
    return this.finishToken(_tokentype.types.num, val);
  };
  
  // Read a string value, interpreting backslash-escapes.
  
  pp.readCodePoint = function () {
    var ch = this.input.charCodeAt(this.pos),
        code = undefined;
  
    if (ch === 123) {
      if (this.options.ecmaVersion < 6) this.unexpected();
      var codePos = ++this.pos;
      code = this.readHexChar(this.input.indexOf('}', this.pos) - this.pos);
      ++this.pos;
      if (code > 0x10FFFF) this.raise(codePos, "Code point out of bounds");
    } else {
      code = this.readHexChar(4);
    }
    return code;
  };
  
  function codePointToString(code) {
    // UTF-16 Decoding
    if (code <= 0xFFFF) return String.fromCharCode(code);
    code -= 0x10000;
    return String.fromCharCode((code >> 10) + 0xD800, (code & 1023) + 0xDC00);
  }
  
  pp.readString = function (quote) {
    var out = "",
        chunkStart = ++this.pos;
    for (;;) {
      if (this.pos >= this.input.length) this.raise(this.start, "Unterminated string constant");
      var ch = this.input.charCodeAt(this.pos);
      if (ch === quote) break;
      if (ch === 92) {
        // '\'
        out += this.input.slice(chunkStart, this.pos);
        out += this.readEscapedChar(false);
        chunkStart = this.pos;
      } else {
        if (_whitespace.isNewLine(ch)) this.raise(this.start, "Unterminated string constant");
        ++this.pos;
      }
    }
    out += this.input.slice(chunkStart, this.pos++);
    return this.finishToken(_tokentype.types.string, out);
  };
  
  // Reads template string tokens.
  
  pp.readTmplToken = function () {
    var out = "",
        chunkStart = this.pos;
    for (;;) {
      if (this.pos >= this.input.length) this.raise(this.start, "Unterminated template");
      var ch = this.input.charCodeAt(this.pos);
      if (ch === 96 || ch === 36 && this.input.charCodeAt(this.pos + 1) === 123) {
        // '`', '${'
        if (this.pos === this.start && this.type === _tokentype.types.template) {
          if (ch === 36) {
            this.pos += 2;
            return this.finishToken(_tokentype.types.dollarBraceL);
          } else {
            ++this.pos;
            return this.finishToken(_tokentype.types.backQuote);
          }
        }
        out += this.input.slice(chunkStart, this.pos);
        return this.finishToken(_tokentype.types.template, out);
      }
      if (ch === 92) {
        // '\'
        out += this.input.slice(chunkStart, this.pos);
        out += this.readEscapedChar(true);
        chunkStart = this.pos;
      } else if (_whitespace.isNewLine(ch)) {
        out += this.input.slice(chunkStart, this.pos);
        ++this.pos;
        switch (ch) {
          case 13:
            if (this.input.charCodeAt(this.pos) === 10) ++this.pos;
          case 10:
            out += "\n";
            break;
          default:
            out += String.fromCharCode(ch);
            break;
        }
        if (this.options.locations) {
          ++this.curLine;
          this.lineStart = this.pos;
        }
        chunkStart = this.pos;
      } else {
        ++this.pos;
      }
    }
  };
  
  // Used to read escaped characters
  
  pp.readEscapedChar = function (inTemplate) {
    var ch = this.input.charCodeAt(++this.pos);
    ++this.pos;
    switch (ch) {
      case 110:
        return "\n"; // 'n' -> '\n'
      case 114:
        return "\r"; // 'r' -> '\r'
      case 120:
        return String.fromCharCode(this.readHexChar(2)); // 'x'
      case 117:
        return codePointToString(this.readCodePoint()); // '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 13:
        if (this.input.charCodeAt(this.pos) === 10) ++this.pos; // '\r\n'
      case 10:
        // ' \n'
        if (this.options.locations) {
          this.lineStart = this.pos;++this.curLine;
        }
        return "";
      default:
        if (ch >= 48 && ch <= 55) {
          var octalStr = this.input.substr(this.pos - 1, 3).match(/^[0-7]+/)[0];
          var octal = parseInt(octalStr, 8);
          if (octal > 255) {
            octalStr = octalStr.slice(0, -1);
            octal = parseInt(octalStr, 8);
          }
          if (octalStr !== "0" && (this.strict || inTemplate)) {
            this.raise(this.pos - 2, "Octal literal in strict mode");
          }
          this.pos += octalStr.length - 1;
          return String.fromCharCode(octal);
        }
        return String.fromCharCode(ch);
    }
  };
  
  // Used to read character escape sequences ('\x', '\u', '\U').
  
  pp.readHexChar = function (len) {
    var codePos = this.pos;
    var n = this.readInt(16, len);
    if (n === null) this.raise(codePos, "Bad character escape sequence");
    return n;
  };
  
  // Read an identifier, and return it as a string. Sets `this.containsEsc`
  // to whether the word contained a '\u' escape.
  //
  // Incrementally adds only escaped chars, adding other chunks as-is
  // as a micro-optimization.
  
  pp.readWord1 = function () {
    this.containsEsc = false;
    var word = "",
        first = true,
        chunkStart = this.pos;
    var astral = this.options.ecmaVersion >= 6;
    while (this.pos < this.input.length) {
      var ch = this.fullCharCodeAtPos();
      if (_identifier.isIdentifierChar(ch, astral)) {
        this.pos += ch <= 0xffff ? 1 : 2;
      } else if (ch === 92) {
        // "\"
        this.containsEsc = true;
        word += this.input.slice(chunkStart, this.pos);
        var escStart = this.pos;
        if (this.input.charCodeAt(++this.pos) != 117) // "u"
          this.raise(this.pos, "Expecting Unicode escape sequence \\uXXXX");
        ++this.pos;
        var esc = this.readCodePoint();
        if (!(first ? _identifier.isIdentifierStart : _identifier.isIdentifierChar)(esc, astral)) this.raise(escStart, "Invalid Unicode escape");
        word += codePointToString(esc);
        chunkStart = this.pos;
      } else {
        break;
      }
      first = false;
    }
    return word + this.input.slice(chunkStart, this.pos);
  };
  
  // Read an identifier or keyword token. Will check for reserved
  // words when necessary.
  
  pp.readWord = function () {
    var word = this.readWord1();
    var type = _tokentype.types.name;
    if ((this.options.ecmaVersion >= 6 || !this.containsEsc) && this.keywords.test(word)) type = _tokentype.keywords[word];
    return this.finishToken(type, word);
  };
  
  },{"./identifier":2,"./locutil":5,"./state":10,"./tokentype":14,"./whitespace":16}],14:[function(_dereq_,module,exports){
  // ## 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.
  
  // 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).
  //
  // The `startsExpr` property is used to check if the token ends a
  // `yield` expression. It is set on all token types that either can
  // directly start an expression (like a quotation mark) or can
  // continue an expression (like the body of a string).
  //
  // `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.
  
  "use strict";
  
  exports.__esModule = true;
  
  function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
  
  var TokenType = function TokenType(label) {
    var conf = arguments.length <= 1 || arguments[1] === undefined ? {} : arguments[1];
  
    _classCallCheck(this, TokenType);
  
    this.label = label;
    this.keyword = conf.keyword;
    this.beforeExpr = !!conf.beforeExpr;
    this.startsExpr = !!conf.startsExpr;
    this.isLoop = !!conf.isLoop;
    this.isAssign = !!conf.isAssign;
    this.prefix = !!conf.prefix;
    this.postfix = !!conf.postfix;
    this.binop = conf.binop || null;
    this.updateContext = null;
  };
  
  exports.TokenType = TokenType;
  
  function binop(name, prec) {
    return new TokenType(name, { beforeExpr: true, binop: prec });
  }
  var beforeExpr = { beforeExpr: true },
      startsExpr = { startsExpr: true };
  
  var types = {
    num: new TokenType("num", startsExpr),
    regexp: new TokenType("regexp", startsExpr),
    string: new TokenType("string", startsExpr),
    name: new TokenType("name", startsExpr),
    eof: new TokenType("eof"),
  
    // Punctuation token types.
    bracketL: new TokenType("[", { beforeExpr: true, startsExpr: true }),
    bracketR: new TokenType("]"),
    braceL: new TokenType("{", { beforeExpr: true, startsExpr: true }),
    braceR: new TokenType("}"),
    parenL: new TokenType("(", { beforeExpr: true, startsExpr: true }),
    parenR: new TokenType(")"),
    comma: new TokenType(",", beforeExpr),
    semi: new TokenType(";", beforeExpr),
    colon: new TokenType(":", beforeExpr),
    dot: new TokenType("."),
    question: new TokenType("?", beforeExpr),
    arrow: new TokenType("=>", beforeExpr),
    template: new TokenType("template"),
    ellipsis: new TokenType("...", beforeExpr),
    backQuote: new TokenType("`", startsExpr),
    dollarBraceL: new TokenType("${", { beforeExpr: true, startsExpr: 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.
    //
    // `isAssign` marks all of `=`, `+=`, `-=` etcetera, which act as
    // binary operators with a very low precedence, that should result
    // in AssignmentExpression nodes.
  
    eq: new TokenType("=", { beforeExpr: true, isAssign: true }),
    assign: new TokenType("_=", { beforeExpr: true, isAssign: true }),
    incDec: new TokenType("++/--", { prefix: true, postfix: true, startsExpr: true }),
    prefix: new TokenType("prefix", { beforeExpr: true, prefix: true, startsExpr: true }),
    logicalOR: binop("||", 1),
    logicalAND: binop("&&", 2),
    bitwiseOR: binop("|", 3),
    bitwiseXOR: binop("^", 4),
    bitwiseAND: binop("&", 5),
    equality: binop("==/!=", 6),
    relational: binop("</>", 7),
    bitShift: binop("<</>>", 8),
    plusMin: new TokenType("+/-", { beforeExpr: true, binop: 9, prefix: true, startsExpr: true }),
    modulo: binop("%", 10),
    star: binop("*", 10),
    slash: binop("/", 10),
    starstar: new TokenType("**", { beforeExpr: true })
  };
  
  exports.types = types;
  // Map keyword names to token types.
  
  var keywords = {};
  
  exports.keywords = keywords;
  // Succinct definitions of keyword token types
  function kw(name) {
    var options = arguments.length <= 1 || arguments[1] === undefined ? {} : arguments[1];
  
    options.keyword = name;
    keywords[name] = types["_" + name] = new TokenType(name, options);
  }
  
  kw("break");
  kw("case", beforeExpr);
  kw("catch");
  kw("continue");
  kw("debugger");
  kw("default", beforeExpr);
  kw("do", { isLoop: true, beforeExpr: true });
  kw("else", beforeExpr);
  kw("finally");
  kw("for", { isLoop: true });
  kw("function", startsExpr);
  kw("if");
  kw("return", beforeExpr);
  kw("switch");
  kw("throw", beforeExpr);
  kw("try");
  kw("var");
  kw("const");
  kw("while", { isLoop: true });
  kw("with");
  kw("new", { beforeExpr: true, startsExpr: true });
  kw("this", startsExpr);
  kw("super", startsExpr);
  kw("class");
  kw("extends", beforeExpr);
  kw("export");
  kw("import");
  kw("null", startsExpr);
  kw("true", startsExpr);
  kw("false", startsExpr);
  kw("in", { beforeExpr: true, binop: 7 });
  kw("instanceof", { beforeExpr: true, binop: 7 });
  kw("typeof", { beforeExpr: true, prefix: true, startsExpr: true });
  kw("void", { beforeExpr: true, prefix: true, startsExpr: true });
  kw("delete", { beforeExpr: true, prefix: true, startsExpr: true });
  
  },{}],15:[function(_dereq_,module,exports){
  "use strict";
  
  exports.__esModule = true;
  exports.isArray = isArray;
  exports.has = has;
  
  function isArray(obj) {
    return Object.prototype.toString.call(obj) === "[object Array]";
  }
  
  // Checks if an object has a property.
  
  function has(obj, propName) {
    return Object.prototype.hasOwnProperty.call(obj, propName);
  }
  
  },{}],16:[function(_dereq_,module,exports){
  // Matches a whole line break (where CRLF is considered a single
  // line break). Used to count lines.
  
  "use strict";
  
  exports.__esModule = true;
  exports.isNewLine = isNewLine;
  var lineBreak = /\r\n?|\n|\u2028|\u2029/;
  exports.lineBreak = lineBreak;
  var lineBreakG = new RegExp(lineBreak.source, "g");
  
  exports.lineBreakG = lineBreakG;
  
  function isNewLine(code) {
    return code === 10 || code === 13 || code === 0x2028 || code == 0x2029;
  }
  
  var nonASCIIwhitespace = /[\u1680\u180e\u2000-\u200a\u202f\u205f\u3000\ufeff]/;
  
  exports.nonASCIIwhitespace = nonASCIIwhitespace;
  var skipWhiteSpace = /(?:\s|\/\/.*|\/\*[^]*?\*\/)*/g;
  exports.skipWhiteSpace = skipWhiteSpace;
  
  },{}]},{},[3])(3)
  });