text: "use strict";
  
  var _types = require("../tokenizer/types");
  
  var _index = require("./index");
  
  var _index2 = _interopRequireDefault(_index);
  
  var _identifier = require("../util/identifier");
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
  
  var pp = _index2.default.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.
  
  /* eslint indent: 0 */
  /* eslint max-len: 0 */
  
  // 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
  
  pp.checkPropClash = function (prop, propHash) {
    if (prop.computed) return;
  
    var key = prop.key;
    var name = void 0;
    switch (key.type) {
      case "Identifier":
        name = key.name;
        break;
  
      case "StringLiteral":
      case "NumericLiteral":
        name = String(key.value);
        break;
  
      default:
        return;
    }
  
    if (name === "__proto__" && prop.kind === "init") {
      if (propHash.proto) this.raise(key.start, "Redefinition of __proto__ property");
      propHash.proto = 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, refShorthandDefaultPos) {
    var startPos = this.state.start,
        startLoc = this.state.startLoc;
    var expr = this.parseMaybeAssign(noIn, refShorthandDefaultPos);
    if (this.match(_types.types.comma)) {
      var node = this.startNodeAt(startPos, startLoc);
      node.expressions = [expr];
      while (this.eat(_types.types.comma)) {
        node.expressions.push(this.parseMaybeAssign(noIn, refShorthandDefaultPos));
      }
      this.toReferencedList(node.expressions);
      return this.finishNode(node, "SequenceExpression");
    }
    return expr;
  };
  
  // Parse an assignment expression. This includes applications of
  // operators like `+=`.
  
  pp.parseMaybeAssign = function (noIn, refShorthandDefaultPos, afterLeftParse, refNeedsArrowPos) {
    var startPos = this.state.start;
    var startLoc = this.state.startLoc;
  
    if (this.match(_types.types._yield) && this.state.inGenerator) {
      var _left = this.parseYield();
      if (afterLeftParse) _left = afterLeftParse.call(this, _left, startPos, startLoc);
      return _left;
    }
  
    var failOnShorthandAssign = void 0;
    if (refShorthandDefaultPos) {
      failOnShorthandAssign = false;
    } else {
      refShorthandDefaultPos = { start: 0 };
      failOnShorthandAssign = true;
    }
  
    if (this.match(_types.types.parenL) || this.match(_types.types.name)) {
      this.state.potentialArrowAt = this.state.start;
    }
  
    var left = this.parseMaybeConditional(noIn, refShorthandDefaultPos, refNeedsArrowPos);
    if (afterLeftParse) left = afterLeftParse.call(this, left, startPos, startLoc);
    if (this.state.type.isAssign) {
      var node = this.startNodeAt(startPos, startLoc);
      node.operator = this.state.value;
      node.left = this.match(_types.types.eq) ? this.toAssignable(left, undefined, "assignment expression") : left;
      refShorthandDefaultPos.start = 0; // reset because shorthand default was used correctly
  
      this.checkLVal(left, undefined, undefined, "assignment expression");
  
      if (left.extra && left.extra.parenthesized) {
        var errorMsg = void 0;
        if (left.type === "ObjectPattern") {
          errorMsg = "`({a}) = 0` use `({a} = 0)`";
        } else if (left.type === "ArrayPattern") {
          errorMsg = "`([a]) = 0` use `([a] = 0)`";
        }
        if (errorMsg) {
          this.raise(left.start, "You're trying to assign to a parenthesized expression, eg. instead of " + errorMsg);
        }
      }
  
      this.next();
      node.right = this.parseMaybeAssign(noIn);
      return this.finishNode(node, "AssignmentExpression");
    } else if (failOnShorthandAssign && refShorthandDefaultPos.start) {
      this.unexpected(refShorthandDefaultPos.start);
    }
  
    return left;
  };
  
  // Parse a ternary conditional (`?:`) operator.
  
  pp.parseMaybeConditional = function (noIn, refShorthandDefaultPos, refNeedsArrowPos) {
    var startPos = this.state.start,
        startLoc = this.state.startLoc;
    var expr = this.parseExprOps(noIn, refShorthandDefaultPos);
    if (refShorthandDefaultPos && refShorthandDefaultPos.start) return expr;
  
    return this.parseConditional(expr, noIn, startPos, startLoc, refNeedsArrowPos);
  };
  
  pp.parseConditional = function (expr, noIn, startPos, startLoc) {
    if (this.eat(_types.types.question)) {
      var node = this.startNodeAt(startPos, startLoc);
      node.test = expr;
      node.consequent = this.parseMaybeAssign();
      this.expect(_types.types.colon);
      node.alternate = this.parseMaybeAssign(noIn);
      return this.finishNode(node, "ConditionalExpression");
    }
    return expr;
  };
  
  // Start the precedence parser.
  
  pp.parseExprOps = function (noIn, refShorthandDefaultPos) {
    var startPos = this.state.start,
        startLoc = this.state.startLoc;
    var expr = this.parseMaybeUnary(refShorthandDefaultPos);
    if (refShorthandDefaultPos && refShorthandDefaultPos.start) {
      return expr;
    } else {
      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.state.type.binop;
    if (prec != null && (!noIn || !this.match(_types.types._in))) {
      if (prec > minPrec) {
        var node = this.startNodeAt(leftStartPos, leftStartLoc);
        node.left = left;
        node.operator = this.state.value;
  
        if (node.operator === "**" && left.type === "UnaryExpression" && left.extra && !left.extra.parenthesizedArgument && !left.extra.parenthesized) {
          this.raise(left.argument.start, "Illegal expression. Wrap left hand side or entire exponentiation in parentheses.");
        }
  
        var op = this.state.type;
        this.next();
  
        var startPos = this.state.start;
        var startLoc = this.state.startLoc;
        node.right = this.parseExprOp(this.parseMaybeUnary(), startPos, startLoc, op.rightAssociative ? prec - 1 : prec, noIn);
  
        this.finishNode(node, op === _types.types.logicalOR || op === _types.types.logicalAND ? "LogicalExpression" : "BinaryExpression");
        return this.parseExprOp(node, leftStartPos, leftStartLoc, minPrec, noIn);
      }
    }
    return left;
  };
  
  // Parse unary operators, both prefix and postfix.
  
  pp.parseMaybeUnary = function (refShorthandDefaultPos) {
    if (this.state.type.prefix) {
      var node = this.startNode();
      var update = this.match(_types.types.incDec);
      node.operator = this.state.value;
      node.prefix = true;
      this.next();
  
      var argType = this.state.type;
      node.argument = this.parseMaybeUnary();
  
      this.addExtra(node, "parenthesizedArgument", argType === _types.types.parenL && (!node.argument.extra || !node.argument.extra.parenthesized));
  
      if (refShorthandDefaultPos && refShorthandDefaultPos.start) {
        this.unexpected(refShorthandDefaultPos.start);
      }
  
      if (update) {
        this.checkLVal(node.argument, undefined, undefined, "prefix operation");
      } else if (this.state.strict && node.operator === "delete" && node.argument.type === "Identifier") {
        this.raise(node.start, "Deleting local variable in strict mode");
      }
  
      return this.finishNode(node, update ? "UpdateExpression" : "UnaryExpression");
    }
  
    var startPos = this.state.start,
        startLoc = this.state.startLoc;
    var expr = this.parseExprSubscripts(refShorthandDefaultPos);
    if (refShorthandDefaultPos && refShorthandDefaultPos.start) return expr;
    while (this.state.type.postfix && !this.canInsertSemicolon()) {
      var _node = this.startNodeAt(startPos, startLoc);
      _node.operator = this.state.value;
      _node.prefix = false;
      _node.argument = expr;
      this.checkLVal(expr, undefined, undefined, "postfix operation");
      this.next();
      expr = this.finishNode(_node, "UpdateExpression");
    }
    return expr;
  };
  
  // Parse call, dot, and `[]`-subscript expressions.
  
  pp.parseExprSubscripts = function (refShorthandDefaultPos) {
    var startPos = this.state.start,
        startLoc = this.state.startLoc;
    var potentialArrowAt = this.state.potentialArrowAt;
    var expr = this.parseExprAtom(refShorthandDefaultPos);
  
    if (expr.type === "ArrowFunctionExpression" && expr.start === potentialArrowAt) {
      return expr;
    }
  
    if (refShorthandDefaultPos && refShorthandDefaultPos.start) {
      return expr;
    }
  
    return this.parseSubscripts(expr, startPos, startLoc);
  };
  
  pp.parseSubscripts = function (base, startPos, startLoc, noCalls) {
    for (;;) {
      if (!noCalls && this.eat(_types.types.doubleColon)) {
        var node = this.startNodeAt(startPos, startLoc);
        node.object = base;
        node.callee = this.parseNoCallExpr();
        return this.parseSubscripts(this.finishNode(node, "BindExpression"), startPos, startLoc, noCalls);
      } else if (this.eat(_types.types.dot)) {
        var _node2 = this.startNodeAt(startPos, startLoc);
        _node2.object = base;
        _node2.property = this.parseIdentifier(true);
        _node2.computed = false;
        base = this.finishNode(_node2, "MemberExpression");
      } else if (this.eat(_types.types.bracketL)) {
        var _node3 = this.startNodeAt(startPos, startLoc);
        _node3.object = base;
        _node3.property = this.parseExpression();
        _node3.computed = true;
        this.expect(_types.types.bracketR);
        base = this.finishNode(_node3, "MemberExpression");
      } else if (!noCalls && this.match(_types.types.parenL)) {
        var possibleAsync = this.state.potentialArrowAt === base.start && base.type === "Identifier" && base.name === "async" && !this.canInsertSemicolon();
        this.next();
  
        var _node4 = this.startNodeAt(startPos, startLoc);
        _node4.callee = base;
        _node4.arguments = this.parseCallExpressionArguments(_types.types.parenR, possibleAsync);
        if (_node4.callee.type === "Import" && _node4.arguments.length !== 1) {
          this.raise(_node4.start, "import() requires exactly one argument");
        }
        base = this.finishNode(_node4, "CallExpression");
  
        if (possibleAsync && this.shouldParseAsyncArrow()) {
          return this.parseAsyncArrowFromCallExpression(this.startNodeAt(startPos, startLoc), _node4);
        } else {
          this.toReferencedList(_node4.arguments);
        }
      } else if (this.match(_types.types.backQuote)) {
        var _node5 = this.startNodeAt(startPos, startLoc);
        _node5.tag = base;
        _node5.quasi = this.parseTemplate();
        base = this.finishNode(_node5, "TaggedTemplateExpression");
      } else {
        return base;
      }
    }
  };
  
  pp.parseCallExpressionArguments = function (close, possibleAsyncArrow) {
    var innerParenStart = void 0;
  
    var elts = [],
        first = true;
    while (!this.eat(close)) {
      if (first) {
        first = false;
      } else {
        this.expect(_types.types.comma);
        if (this.eat(close)) break;
      }
  
      // we need to make sure that if this is an async arrow functions, that we don't allow inner parens inside the params
      if (this.match(_types.types.parenL) && !innerParenStart) {
        innerParenStart = this.state.start;
      }
  
      elts.push(this.parseExprListItem(undefined, possibleAsyncArrow ? { start: 0 } : undefined));
    }
  
    // we found an async arrow function so let's not allow any inner parens
    if (possibleAsyncArrow && innerParenStart && this.shouldParseAsyncArrow()) {
      this.unexpected();
    }
  
    return elts;
  };
  
  pp.shouldParseAsyncArrow = function () {
    return this.match(_types.types.arrow);
  };
  
  pp.parseAsyncArrowFromCallExpression = function (node, call) {
    this.expect(_types.types.arrow);
    return this.parseArrowExpression(node, call.arguments, true);
  };
  
  // Parse a no-call expression (like argument of `new` or `::` operators).
  
  pp.parseNoCallExpr = function () {
    var startPos = this.state.start,
        startLoc = this.state.startLoc;
    return this.parseSubscripts(this.parseExprAtom(), startPos, startLoc, true);
  };
  
  // 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 (refShorthandDefaultPos) {
    var node = void 0,
        canBeArrow = this.state.potentialArrowAt === this.state.start;
    switch (this.state.type) {
      case _types.types._super:
        if (!this.state.inMethod && !this.options.allowSuperOutsideMethod) {
          this.raise(this.state.start, "'super' outside of function or class");
        }
  
        node = this.startNode();
        this.next();
        if (!this.match(_types.types.parenL) && !this.match(_types.types.bracketL) && !this.match(_types.types.dot)) {
          this.unexpected();
        }
        if (this.match(_types.types.parenL) && this.state.inMethod !== "constructor" && !this.options.allowSuperOutsideMethod) {
          this.raise(node.start, "super() outside of class constructor");
        }
        return this.finishNode(node, "Super");
  
      case _types.types._import:
        if (!this.hasPlugin("dynamicImport")) this.unexpected();
  
        node = this.startNode();
        this.next();
        if (!this.match(_types.types.parenL)) {
          this.unexpected();
        }
        return this.finishNode(node, "Import");
  
      case _types.types._this:
        node = this.startNode();
        this.next();
        return this.finishNode(node, "ThisExpression");
  
      case _types.types._yield:
        if (this.state.inGenerator) this.unexpected();
  
      case _types.types.name:
        node = this.startNode();
        var allowAwait = this.state.value === "await" && this.state.inAsync;
        var allowYield = this.shouldAllowYieldIdentifier();
        var id = this.parseIdentifier(allowAwait || allowYield);
  
        if (id.name === "await") {
          if (this.state.inAsync || this.inModule) {
            return this.parseAwait(node);
          }
        } else if (id.name === "async" && this.match(_types.types._function) && !this.canInsertSemicolon()) {
          this.next();
          return this.parseFunction(node, false, false, true);
        } else if (canBeArrow && id.name === "async" && this.match(_types.types.name)) {
          var params = [this.parseIdentifier()];
          this.expect(_types.types.arrow);
          // let foo = bar => {};
          return this.parseArrowExpression(node, params, true);
        }
  
        if (canBeArrow && !this.canInsertSemicolon() && this.eat(_types.types.arrow)) {
          return this.parseArrowExpression(node, [id]);
        }
  
        return id;
  
      case _types.types._do:
        if (this.hasPlugin("doExpressions")) {
          var _node6 = this.startNode();
          this.next();
          var oldInFunction = this.state.inFunction;
          var oldLabels = this.state.labels;
          this.state.labels = [];
          this.state.inFunction = false;
          _node6.body = this.parseBlock(false, true);
          this.state.inFunction = oldInFunction;
          this.state.labels = oldLabels;
          return this.finishNode(_node6, "DoExpression");
        }
  
      case _types.types.regexp:
        var value = this.state.value;
        node = this.parseLiteral(value.value, "RegExpLiteral");
        node.pattern = value.pattern;
        node.flags = value.flags;
        return node;
  
      case _types.types.num:
        return this.parseLiteral(this.state.value, "NumericLiteral");
  
      case _types.types.string:
        return this.parseLiteral(this.state.value, "StringLiteral");
  
      case _types.types._null:
        node = this.startNode();
        this.next();
        return this.finishNode(node, "NullLiteral");
  
      case _types.types._true:case _types.types._false:
        node = this.startNode();
        node.value = this.match(_types.types._true);
        this.next();
        return this.finishNode(node, "BooleanLiteral");
  
      case _types.types.parenL:
        return this.parseParenAndDistinguishExpression(null, null, canBeArrow);
  
      case _types.types.bracketL:
        node = this.startNode();
        this.next();
        node.elements = this.parseExprList(_types.types.bracketR, true, refShorthandDefaultPos);
        this.toReferencedList(node.elements);
        return this.finishNode(node, "ArrayExpression");
  
      case _types.types.braceL:
        return this.parseObj(false, refShorthandDefaultPos);
  
      case _types.types._function:
        return this.parseFunctionExpression();
  
      case _types.types.at:
        this.parseDecorators();
  
      case _types.types._class:
        node = this.startNode();
        this.takeDecorators(node);
        return this.parseClass(node, false);
  
      case _types.types._new:
        return this.parseNew();
  
      case _types.types.backQuote:
        return this.parseTemplate();
  
      case _types.types.doubleColon:
        node = this.startNode();
        this.next();
        node.object = null;
        var callee = node.callee = this.parseNoCallExpr();
        if (callee.type === "MemberExpression") {
          return this.finishNode(node, "BindExpression");
        } else {
          this.raise(callee.start, "Binding should be performed on object property.");
        }
  
      default:
        this.unexpected();
    }
  };
  
  pp.parseFunctionExpression = function () {
    var node = this.startNode();
    var meta = this.parseIdentifier(true);
    if (this.state.inGenerator && this.eat(_types.types.dot) && this.hasPlugin("functionSent")) {
      return this.parseMetaProperty(node, meta, "sent");
    } else {
      return this.parseFunction(node, false);
    }
  };
  
  pp.parseMetaProperty = function (node, meta, propertyName) {
    node.meta = meta;
    node.property = this.parseIdentifier(true);
  
    if (node.property.name !== propertyName) {
      this.raise(node.property.start, "The only valid meta property for new is " + meta.name + "." + propertyName);
    }
  
    return this.finishNode(node, "MetaProperty");
  };
  
  pp.parseLiteral = function (value, type) {
    var node = this.startNode();
    this.addExtra(node, "rawValue", value);
    this.addExtra(node, "raw", this.input.slice(this.state.start, this.state.end));
    node.value = value;
    this.next();
    return this.finishNode(node, type);
  };
  
  pp.parseParenExpression = function () {
    this.expect(_types.types.parenL);
    var val = this.parseExpression();
    this.expect(_types.types.parenR);
    return val;
  };
  
  pp.parseParenAndDistinguishExpression = function (startPos, startLoc, canBeArrow, isAsync) {
    startPos = startPos || this.state.start;
    startLoc = startLoc || this.state.startLoc;
  
    var val = void 0;
    this.expect(_types.types.parenL);
  
    var innerStartPos = this.state.start,
        innerStartLoc = this.state.startLoc;
    var exprList = [],
        first = true;
    var refShorthandDefaultPos = { start: 0 },
        spreadStart = void 0,
        optionalCommaStart = void 0;
    var refNeedsArrowPos = { start: 0 };
    while (!this.match(_types.types.parenR)) {
      if (first) {
        first = false;
      } else {
        this.expect(_types.types.comma, refNeedsArrowPos.start || null);
        if (this.match(_types.types.parenR)) {
          optionalCommaStart = this.state.start;
          break;
        }
      }
  
      if (this.match(_types.types.ellipsis)) {
        var spreadNodeStartPos = this.state.start,
            spreadNodeStartLoc = this.state.startLoc;
        spreadStart = this.state.start;
        exprList.push(this.parseParenItem(this.parseRest(), spreadNodeStartLoc, spreadNodeStartPos));
        break;
      } else {
        exprList.push(this.parseMaybeAssign(false, refShorthandDefaultPos, this.parseParenItem, refNeedsArrowPos));
      }
    }
  
    var innerEndPos = this.state.start;
    var innerEndLoc = this.state.startLoc;
    this.expect(_types.types.parenR);
  
    var arrowNode = this.startNodeAt(startPos, startLoc);
    if (canBeArrow && this.shouldParseArrow() && (arrowNode = this.parseArrow(arrowNode))) {
      for (var _iterator = exprList, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
        var _ref;
  
        if (_isArray) {
          if (_i >= _iterator.length) break;
          _ref = _iterator[_i++];
        } else {
          _i = _iterator.next();
          if (_i.done) break;
          _ref = _i.value;
        }
  
        var param = _ref;
  
        if (param.extra && param.extra.parenthesized) this.unexpected(param.extra.parenStart);
      }
  
      return this.parseArrowExpression(arrowNode, exprList, isAsync);
    }
  
    if (!exprList.length) {
      if (isAsync) {
        return;
      } else {
        this.unexpected(this.state.lastTokStart);
      }
    }
    if (optionalCommaStart) this.unexpected(optionalCommaStart);
    if (spreadStart) this.unexpected(spreadStart);
    if (refShorthandDefaultPos.start) this.unexpected(refShorthandDefaultPos.start);
    if (refNeedsArrowPos.start) this.unexpected(refNeedsArrowPos.start);
  
    if (exprList.length > 1) {
      val = this.startNodeAt(innerStartPos, innerStartLoc);
      val.expressions = exprList;
      this.toReferencedList(val.expressions);
      this.finishNodeAt(val, "SequenceExpression", innerEndPos, innerEndLoc);
    } else {
      val = exprList[0];
    }
  
    this.addExtra(val, "parenthesized", true);
    this.addExtra(val, "parenStart", startPos);
  
    return val;
  };
  
  pp.shouldParseArrow = function () {
    return !this.canInsertSemicolon();
  };
  
  pp.parseArrow = function (node) {
    if (this.eat(_types.types.arrow)) {
      return node;
    }
  };
  
  pp.parseParenItem = function (node) {
    return node;
  };
  
  // 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
  
  pp.parseNew = function () {
    var node = this.startNode();
    var meta = this.parseIdentifier(true);
  
    if (this.eat(_types.types.dot)) {
      return this.parseMetaProperty(node, meta, "target");
    }
  
    node.callee = this.parseNoCallExpr();
  
    if (this.eat(_types.types.parenL)) {
      node.arguments = this.parseExprList(_types.types.parenR);
      this.toReferencedList(node.arguments);
    } else {
      node.arguments = [];
    }
  
    return this.finishNode(node, "NewExpression");
  };
  
  // Parse template expression.
  
  pp.parseTemplateElement = function () {
    var elem = this.startNode();
    elem.value = {
      raw: this.input.slice(this.state.start, this.state.end).replace(/\r\n?/g, "\n"),
      cooked: this.state.value
    };
    this.next();
    elem.tail = this.match(_types.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(_types.types.dollarBraceL);
      node.expressions.push(this.parseExpression());
      this.expect(_types.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, refShorthandDefaultPos) {
    var decorators = [];
    var propHash = Object.create(null);
    var first = true;
    var node = this.startNode();
  
    node.properties = [];
    this.next();
  
    var firstRestLocation = null;
  
    while (!this.eat(_types.types.braceR)) {
      if (first) {
        first = false;
      } else {
        this.expect(_types.types.comma);
        if (this.eat(_types.types.braceR)) break;
      }
  
      while (this.match(_types.types.at)) {
        decorators.push(this.parseDecorator());
      }
  
      var prop = this.startNode(),
          isGenerator = false,
          isAsync = false,
          startPos = void 0,
          startLoc = void 0;
      if (decorators.length) {
        prop.decorators = decorators;
        decorators = [];
      }
  
      if (this.hasPlugin("objectRestSpread") && this.match(_types.types.ellipsis)) {
        prop = this.parseSpread();
        prop.type = isPattern ? "RestProperty" : "SpreadProperty";
        node.properties.push(prop);
        if (isPattern) {
          var position = this.state.start;
          if (firstRestLocation !== null) {
            this.unexpected(firstRestLocation, "Cannot have multiple rest elements when destructuring");
          } else if (this.eat(_types.types.braceR)) {
            break;
          } else if (this.match(_types.types.comma) && this.lookahead().type === _types.types.braceR) {
            // TODO: temporary rollback
            // this.unexpected(position, "A trailing comma is not permitted after the rest element");
            continue;
          } else {
            firstRestLocation = position;
            continue;
          }
        } else {
          continue;
        }
      }
  
      prop.method = false;
      prop.shorthand = false;
  
      if (isPattern || refShorthandDefaultPos) {
        startPos = this.state.start;
        startLoc = this.state.startLoc;
      }
  
      if (!isPattern) {
        isGenerator = this.eat(_types.types.star);
      }
  
      if (!isPattern && this.isContextual("async")) {
        if (isGenerator) this.unexpected();
  
        var asyncId = this.parseIdentifier();
        if (this.match(_types.types.colon) || this.match(_types.types.parenL) || this.match(_types.types.braceR) || this.match(_types.types.eq)) {
          prop.key = asyncId;
        } else {
          isAsync = true;
          if (this.hasPlugin("asyncGenerators")) isGenerator = this.eat(_types.types.star);
          this.parsePropertyName(prop);
        }
      } else {
        this.parsePropertyName(prop);
      }
  
      this.parseObjPropValue(prop, startPos, startLoc, isGenerator, isAsync, isPattern, refShorthandDefaultPos);
      this.checkPropClash(prop, propHash);
  
      if (prop.shorthand) {
        this.addExtra(prop, "shorthand", true);
      }
  
      node.properties.push(prop);
    }
  
    if (firstRestLocation !== null) {
      this.unexpected(firstRestLocation, "The rest element has to be the last element when destructuring");
    }
  
    if (decorators.length) {
      this.raise(this.state.start, "You have trailing decorators with no property");
    }
  
    return this.finishNode(node, isPattern ? "ObjectPattern" : "ObjectExpression");
  };
  
  pp.parseObjPropValue = function (prop, startPos, startLoc, isGenerator, isAsync, isPattern, refShorthandDefaultPos) {
    if (isAsync || isGenerator || this.match(_types.types.parenL)) {
      if (isPattern) this.unexpected();
      prop.kind = "method";
      prop.method = true;
      this.parseMethod(prop, isGenerator, isAsync);
      return this.finishNode(prop, "ObjectMethod");
    }
  
    if (this.eat(_types.types.colon)) {
      prop.value = isPattern ? this.parseMaybeDefault(this.state.start, this.state.startLoc) : this.parseMaybeAssign(false, refShorthandDefaultPos);
      return this.finishNode(prop, "ObjectProperty");
    }
  
    if (!isPattern && !prop.computed && prop.key.type === "Identifier" && (prop.key.name === "get" || prop.key.name === "set") && !this.match(_types.types.comma) && !this.match(_types.types.braceR)) {
      if (isGenerator || isAsync) this.unexpected();
      prop.kind = prop.key.name;
      this.parsePropertyName(prop);
      this.parseMethod(prop, false);
      var paramCount = prop.kind === "get" ? 0 : 1;
      if (prop.params.length !== paramCount) {
        var start = prop.start;
        if (prop.kind === "get") {
          this.raise(start, "getter should have no params");
        } else {
          this.raise(start, "setter should have exactly one param");
        }
      }
      return this.finishNode(prop, "ObjectMethod");
    }
  
    if (!prop.computed && prop.key.type === "Identifier") {
      if (isPattern) {
        var illegalBinding = this.isKeyword(prop.key.name);
        if (!illegalBinding && this.state.strict) {
          illegalBinding = _identifier.reservedWords.strictBind(prop.key.name) || _identifier.reservedWords.strict(prop.key.name);
        }
        if (illegalBinding) {
          this.raise(prop.key.start, "Binding " + prop.key.name);
        }
        prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key.__clone());
      } else if (this.match(_types.types.eq) && refShorthandDefaultPos) {
        if (!refShorthandDefaultPos.start) {
          refShorthandDefaultPos.start = this.state.start;
        }
        prop.value = this.parseMaybeDefault(startPos, startLoc, prop.key.__clone());
      } else {
        prop.value = prop.key.__clone();
      }
      prop.shorthand = true;
      return this.finishNode(prop, "ObjectProperty");
    }
  
    this.unexpected();
  };
  
  pp.parsePropertyName = function (prop) {
    if (this.eat(_types.types.bracketL)) {
      prop.computed = true;
      prop.key = this.parseMaybeAssign();
      this.expect(_types.types.bracketR);
      return prop.key;
    } else {
      prop.computed = false;
      return prop.key = this.match(_types.types.num) || this.match(_types.types.string) ? this.parseExprAtom() : this.parseIdentifier(true);
    }
  };
  
  // Initialize empty function node.
  
  pp.initFunction = function (node, isAsync) {
    node.id = null;
    node.generator = false;
    node.expression = false;
    node.async = !!isAsync;
  };
  
  // Parse object or class method.
  
  pp.parseMethod = function (node, isGenerator, isAsync) {
    var oldInMethod = this.state.inMethod;
    this.state.inMethod = node.kind || true;
    this.initFunction(node, isAsync);
    this.expect(_types.types.parenL);
    node.params = this.parseBindingList(_types.types.parenR);
    node.generator = isGenerator;
    this.parseFunctionBody(node);
    this.state.inMethod = oldInMethod;
    return node;
  };
  
  // Parse arrow function expression with given parameters.
  
  pp.parseArrowExpression = function (node, params, isAsync) {
    this.initFunction(node, isAsync);
    node.params = this.toAssignableList(params, true, "arrow function parameters");
    this.parseFunctionBody(node, true);
    return this.finishNode(node, "ArrowFunctionExpression");
  };
  
  // Parse function body and check parameters.
  
  pp.parseFunctionBody = function (node, allowExpression) {
    var isExpression = allowExpression && !this.match(_types.types.braceL);
  
    var oldInAsync = this.state.inAsync;
    this.state.inAsync = node.async;
    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.state.inFunction,
          oldInGen = this.state.inGenerator,
          oldLabels = this.state.labels;
      this.state.inFunction = true;this.state.inGenerator = node.generator;this.state.labels = [];
      node.body = this.parseBlock(true);
      node.expression = false;
      this.state.inFunction = oldInFunc;this.state.inGenerator = oldInGen;this.state.labels = oldLabels;
    }
    this.state.inAsync = oldInAsync;
  
    // 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`.
    var checkLVal = this.state.strict;
    var isStrict = false;
  
    // arrow function
    if (allowExpression) checkLVal = true;
  
    // normal function
    if (!isExpression && node.body.directives.length) {
      for (var _iterator2 = node.body.directives, _isArray2 = Array.isArray(_iterator2), _i2 = 0, _iterator2 = _isArray2 ? _iterator2 : _iterator2[Symbol.iterator]();;) {
        var _ref2;
  
        if (_isArray2) {
          if (_i2 >= _iterator2.length) break;
          _ref2 = _iterator2[_i2++];
        } else {
          _i2 = _iterator2.next();
          if (_i2.done) break;
          _ref2 = _i2.value;
        }
  
        var directive = _ref2;
  
        if (directive.value.value === "use strict") {
          isStrict = true;
          checkLVal = true;
          break;
        }
      }
    }
  
    //
    if (isStrict && node.id && node.id.type === "Identifier" && node.id.name === "yield") {
      this.raise(node.id.start, "Binding yield in strict mode");
    }
  
    if (checkLVal) {
      var nameHash = Object.create(null);
      var oldStrict = this.state.strict;
      if (isStrict) this.state.strict = true;
      if (node.id) {
        this.checkLVal(node.id, true, undefined, "function name");
      }
      for (var _iterator3 = node.params, _isArray3 = Array.isArray(_iterator3), _i3 = 0, _iterator3 = _isArray3 ? _iterator3 : _iterator3[Symbol.iterator]();;) {
        var _ref3;
  
        if (_isArray3) {
          if (_i3 >= _iterator3.length) break;
          _ref3 = _iterator3[_i3++];
        } else {
          _i3 = _iterator3.next();
          if (_i3.done) break;
          _ref3 = _i3.value;
        }
  
        var param = _ref3;
  
        if (isStrict && param.type !== "Identifier") {
          this.raise(param.start, "Non-simple parameter in strict mode");
        }
        this.checkLVal(param, true, nameHash, "function parameter list");
      }
      this.state.strict = oldStrict;
    }
  };
  
  // 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, allowEmpty, refShorthandDefaultPos) {
    var elts = [],
        first = true;
    while (!this.eat(close)) {
      if (first) {
        first = false;
      } else {
        this.expect(_types.types.comma);
        if (this.eat(close)) break;
      }
  
      elts.push(this.parseExprListItem(allowEmpty, refShorthandDefaultPos));
    }
    return elts;
  };
  
  pp.parseExprListItem = function (allowEmpty, refShorthandDefaultPos) {
    var elt = void 0;
    if (allowEmpty && this.match(_types.types.comma)) {
      elt = null;
    } else if (this.match(_types.types.ellipsis)) {
      elt = this.parseSpread(refShorthandDefaultPos);
    } else {
      elt = this.parseMaybeAssign(false, refShorthandDefaultPos, this.parseParenItem);
    }
    return elt;
  };
  
  // Parse the next token as an identifier. If `liberal` is true (used
  // when parsing properties), it will also convert keywords into
  // identifiers.
  
  pp.parseIdentifier = function (liberal) {
    var node = this.startNode();
  
    if (this.match(_types.types.name)) {
      if (!liberal && this.state.strict && _identifier.reservedWords.strict(this.state.value)) {
        this.raise(this.state.start, "The keyword '" + this.state.value + "' is reserved");
      }
  
      node.name = this.state.value;
    } else if (liberal && this.state.type.keyword) {
      node.name = this.state.type.keyword;
    } else {
      this.unexpected();
    }
  
    if (!liberal && node.name === "await" && this.state.inAsync) {
      this.raise(node.start, "invalid use of await inside of an async function");
    }
  
    node.loc.identifierName = node.name;
  
    this.next();
    return this.finishNode(node, "Identifier");
  };
  
  // Parses await expression inside async function.
  
  pp.parseAwait = function (node) {
    if (!this.state.inAsync) {
      this.unexpected();
    }
    if (this.match(_types.types.star)) {
      this.raise(node.start, "await* has been removed from the async functions proposal. Use Promise.all() instead.");
    }
    node.argument = this.parseMaybeUnary();
    return this.finishNode(node, "AwaitExpression");
  };
  
  // Parses yield expression inside generator.
  
  pp.parseYield = function () {
    var node = this.startNode();
    this.next();
    if (this.match(_types.types.semi) || this.canInsertSemicolon() || !this.match(_types.types.star) && !this.state.type.startsExpr) {
      node.delegate = false;
      node.argument = null;
    } else {
      node.delegate = this.eat(_types.types.star);
      node.argument = this.parseMaybeAssign();
    }
    return this.finishNode(node, "YieldExpression");
  };