update to modular acorn

lib/acorn/AUTHORS

@@ -0,0 +1,32 @@
+List of Acorn contributors. Updated before every release.
+
+Alistair Braidwood
+Aparajita Fishman
+Arian Stolwijk
+Artem Govorov
+Brandon Mills
+Charles Hughes
+Conrad Irwin
+David Bonnet
+impinball
+Ingvar Stepanyan
+Jiaxing Wang
+Johannes Herr
+Jürg Lehni
+keeyipchan
+krator
+Marijn Haverbeke
+Martin Carlberg
+Mathias Bynens
+Mathieu 'p01' Henri
+Max Schaefer
+Mihai Bazon
+Mike Rennie
+Oskar Schöldström
+Paul Harper
+Peter Rust
+PlNG
+r-e-d
+Rich Harris
+Sebastian McKenzie
+zsjforcn

lib/acorn/LICENSE

@@ -0,0 +1,19 @@
+Copyright (C) 2012-2014 by various contributors (see AUTHORS)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

lib/acorn/package.json

@@ -0,0 +1,44 @@
+{
+  "name": "acorn",
+  "description": "ECMAScript parser",
+  "homepage": "https://github.com/marijnh/acorn",
+  "main": "src/index.js",
+  "version": "1.0.0",
+  "engines": {
+    "node": ">=0.4.0"
+  },
+  "maintainers": [
+    {
+      "name": "Marijn Haverbeke",
+      "email": "marijnh@gmail.com",
+      "web": "http://marijnhaverbeke.nl"
+    },
+    {
+      "name": "Ingvar Stepanyan",
+      "email": "me@rreverser.com",
+      "web": "http://rreverser.com/"
+    }
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/marijnh/acorn.git"
+  },
+  "licenses": [
+    {
+      "type": "MIT",
+      "url": "https://raw.githubusercontent.com/marijnh/acorn/master/LICENSE"
+    }
+  ],
+  "scripts": {
+    "test": "node test/run.js",
+    "prepublish": "node bin/prepublish.sh"
+  },
+  "bin": {
+    "acorn": "./bin/acorn"
+  },
+  "devDependencies": {
+    "babelify": "^5.0.4",
+    "browserify": "^9.0.3",
+    "unicode-7.0.0": "~0.1.5"
+  }
+}

lib/acorn/plugins/flow.js

@@ -0,0 +1,818 @@
+"use strict";
+
+var acorn = require("..");
+
+var pp = acorn.Parser.prototype;
+var tt = acorn.tokTypes;
+
+pp.isRelational = function (op) {
+  return this.type === tt.relational && this.value === op;
+};
+
+pp.expectRelational = function (op) {
+  if (this.isRelational(op)) {
+    this.next();
+  } else {
+    this.unexpected();
+  }
+};
+
+pp.flow_parseDeclareClass = function (node) {
+  this.next();
+  this.flow_parseInterfaceish(node, true);
+  return this.finishNode(node, "DeclareClass");
+};
+
+pp.flow_parseDeclareFunction = function (node) {
+  this.next();
+
+  var id = node.id = this.parseIdent();
+
+  var typeNode = this.startNode();
+  var typeContainer = this.startNode();
+
+  if (this.isRelational("<")) {
+    typeNode.typeParameters = this.flow_parseTypeParameterDeclaration();
+  } else {
+    typeNode.typeParameters = null;
+  }
+
+  this.expect(tt.parenL);
+  var tmp = this.flow_parseFunctionTypeParams();
+  typeNode.params = tmp.params;
+  typeNode.rest = tmp.rest;
+  this.expect(tt.parenR);
+
+  this.expect(tt.colon);
+  typeNode.returnType = this.flow_parseType();
+
+  typeContainer.typeAnnotation = this.finishNode(typeNode, "FunctionTypeAnnotation");
+  id.typeAnnotation = this.finishNode(typeContainer, "TypeAnnotation");
+
+  this.finishNode(id, id.type);
+
+  this.semicolon();
+
+  return this.finishNode(node, "DeclareFunction");
+};
+
+pp.flow_parseDeclare = function (node) {
+  if (this.type === tt._class) {
+    return this.flow_parseDeclareClass(node);
+  } else if (this.type === tt._function) {
+    return this.flow_parseDeclareFunction(node);
+  } else if (this.type === tt._var) {
+    return this.flow_parseDeclareVariable(node);
+  } else if (this.isContextual("module")) {
+    return this.flow_parseDeclareModule(node);
+  } else {
+    this.unexpected();
+  }
+};
+
+pp.flow_parseDeclareVariable = function (node) {
+  this.next();
+  node.id = this.flow_parseTypeAnnotatableIdentifier();
+  this.semicolon();
+  return this.finishNode(node, "DeclareVariable");
+};
+
+pp.flow_parseDeclareModule = function (node) {
+  this.next();
+
+  if (this.type === tt.string) {
+    node.id = this.parseExprAtom();
+  } else {
+    node.id = this.parseIdent();
+  }
+
+  var bodyNode = node.body = this.startNode();
+  var body = bodyNode.body = [];
+  this.expect(tt.braceL);
+  while (this.type !== tt.braceR) {
+    var node2 = this.startNode();
+
+    // todo: declare check
+    this.next();
+
+    body.push(this.flow_parseDeclare(node2));
+  }
+  this.expect(tt.braceR);
+
+  this.finishNode(bodyNode, "BlockStatement");
+  return this.finishNode(node, "DeclareModule");
+};
+
+// Interfaces
+
+pp.flow_parseInterfaceish = function (node, allowStatic) {
+  node.id = this.parseIdent();
+
+  if (this.isRelational("<")) {
+    node.typeParameters = this.flow_parseTypeParameterDeclaration();
+  } else {
+    node.typeParameters = null;
+  }
+
+  node["extends"] = [];
+
+  if (this.eat(tt._extends)) {
+    do {
+      node["extends"].push(this.flow_parseInterfaceExtends());
+    } while (this.eat(tt.comma));
+  }
+
+  node.body = this.flow_parseObjectType(allowStatic);
+};
+
+pp.flow_parseInterfaceExtends = function () {
+  var node = this.startNode();
+
+  node.id = this.parseIdent();
+  if (this.isRelational("<")) {
+    node.typeParameters = this.flow_parseTypeParameterInstantiation();
+  } else {
+    node.typeParameters = null;
+  }
+
+  return this.finishNode(node, "InterfaceExtends");
+};
+
+pp.flow_parseInterface = function (node) {
+  this.flow_parseInterfaceish(node, false);
+  return this.finishNode(node, "InterfaceDeclaration");
+};
+
+// Type aliases
+
+pp.flow_parseTypeAlias = function (node) {
+  node.id = this.parseIdent();
+
+  if (this.isRelational("<")) {
+    node.typeParameters = this.flow_parseTypeParameterDeclaration();
+  } else {
+    node.typeParameters = null;
+  }
+
+  this.expect(tt.eq);
+
+  node.right = this.flow_parseType();
+
+  this.semicolon();
+
+  return this.finishNode(node, "TypeAlias");
+};
+
+// Type annotations
+
+pp.flow_parseTypeParameterDeclaration = function () {
+  var node = this.startNode();
+  node.params = [];
+
+  this.expectRelational("<");
+  while (!this.isRelational(">")) {
+    node.params.push(this.flow_parseTypeAnnotatableIdentifier());
+    if (!this.isRelational(">")) {
+      this.expect(tt.comma);
+    }
+  }
+  this.expectRelational(">");
+
+  return this.finishNode(node, "TypeParameterDeclaration");
+};
+
+pp.flow_parseTypeParameterInstantiation = function () {
+  var node = this.startNode(),
+      oldInType = this.inType;
+  node.params = [];
+
+  this.inType = true;
+
+  this.expectRelational("<");
+  while (!this.isRelational(">")) {
+    node.params.push(this.flow_parseType());
+    if (!this.isRelational(">")) {
+      this.expect(tt.comma);
+    }
+  }
+  this.expectRelational(">");
+
+  this.inType = oldInType;
+
+  return this.finishNode(node, "TypeParameterInstantiation");
+};
+
+pp.flow_parseObjectPropertyKey = function () {
+  return this.type === tt.num || this.type === tt.string ? this.parseExprAtom() : this.parseIdent(true);
+};
+
+pp.flow_parseObjectTypeIndexer = function (node, isStatic) {
+  node["static"] = isStatic;
+
+  this.expect(tt.bracketL);
+  node.id = this.flow_parseObjectPropertyKey();
+  this.expect(tt.colon);
+  node.key = this.flow_parseType();
+  this.expect(tt.bracketR);
+  this.expect(tt.colon);
+  node.value = this.flow_parseType();
+
+  return this.finishNode(node, "ObjectTypeIndexer");
+};
+
+pp.flow_parseObjectTypeMethodish = function (node) {
+  node.params = [];
+  node.rest = null;
+  node.typeParameters = null;
+
+  if (this.isRelational("<")) {
+    node.typeParameters = this.flow_parseTypeParameterDeclaration();
+  }
+
+  this.expect(tt.parenL);
+  while (this.type === tt.name) {
+    node.params.push(this.flow_parseFunctionTypeParam());
+    if (this.type !== tt.parenR) {
+      this.expect(tt.comma);
+    }
+  }
+
+  if (this.eat(tt.ellipsis)) {
+    node.rest = this.flow_parseFunctionTypeParam();
+  }
+  this.expect(tt.parenR);
+  this.expect(tt.colon);
+  node.returnType = this.flow_parseType();
+
+  return this.finishNode(node, "FunctionTypeAnnotation");
+};
+
+pp.flow_parseObjectTypeMethod = function (start, isStatic, key) {
+  var node = this.startNodeAt(start);
+  node.value = this.flow_parseObjectTypeMethodish(this.startNodeAt(start));
+  node["static"] = isStatic;
+  node.key = key;
+  node.optional = false;
+  return this.finishNode(node, "ObjectTypeProperty");
+};
+
+pp.flow_parseObjectTypeCallProperty = function (node, isStatic) {
+  var valueNode = this.startNode();
+  node["static"] = isStatic;
+  node.value = this.flow_parseObjectTypeMethodish(valueNode);
+  return this.finishNode(node, "ObjectTypeCallProperty");
+};
+
+pp.flow_parseObjectType = function (allowStatic) {
+  var nodeStart = this.startNode();
+  var node;
+  var optional = false;
+  var property;
+  var propertyKey;
+  var propertyTypeAnnotation;
+  var token;
+  var isStatic;
+
+  nodeStart.callProperties = [];
+  nodeStart.properties = [];
+  nodeStart.indexers = [];
+
+  this.expect(tt.braceL);
+
+  while (this.type !== tt.braceR) {
+    var start = this.markPosition();
+    node = this.startNode();
+    if (allowStatic && this.isContextual("static")) {
+      this.next();
+      isStatic = true;
+    }
+
+    if (this.type === tt.bracketL) {
+      nodeStart.indexers.push(this.flow_parseObjectTypeIndexer(node, isStatic));
+    } else if (this.type === tt.parenL || this.isRelational("<")) {
+      nodeStart.callProperties.push(this.flow_parseObjectTypeCallProperty(node, allowStatic));
+    } else {
+      if (isStatic && this.type === tt.colon) {
+        propertyKey = this.parseIdent();
+      } else {
+        propertyKey = this.flow_parseObjectPropertyKey();
+      }
+      if (this.isRelational("<") || this.type === tt.parenL) {
+        // This is a method property
+        nodeStart.properties.push(this.flow_parseObjectTypeMethod(start, isStatic, propertyKey));
+      } else {
+        if (this.eat(tt.question)) {
+          optional = true;
+        }
+        this.expect(tt.colon);
+        node.key = propertyKey;
+        node.value = this.flow_parseType();
+        node.optional = optional;
+        node["static"] = isStatic;
+        nodeStart.properties.push(this.finishNode(node, "ObjectTypeProperty"));
+      }
+    }
+
+    if (!this.eat(tt.semi) && this.type !== tt.braceR) {
+      this.unexpected();
+    }
+  }
+
+  this.expect(tt.braceR);
+
+  return this.finishNode(nodeStart, "ObjectTypeAnnotation");
+};
+
+pp.flow_parseGenericType = function (start, id) {
+  var node = this.startNodeAt(start);
+
+  node.typeParameters = null;
+  node.id = id;
+
+  while (this.eat(tt.dot)) {
+    var node2 = this.startNodeAt(start);
+    node2.qualification = node.id;
+    node2.id = this.parseIdent();
+    node.id = this.finishNode(node2, "QualifiedTypeIdentifier");
+  }
+
+  if (this.isRelational("<")) {
+    node.typeParameters = this.flow_parseTypeParameterInstantiation();
+  }
+
+  return this.finishNode(node, "GenericTypeAnnotation");
+};
+
+pp.flow_parseVoidType = function () {
+  var node = this.startNode();
+  this.expect(tt._void);
+  return this.finishNode(node, "VoidTypeAnnotation");
+};
+
+pp.flow_parseTypeofType = function () {
+  var node = this.startNode();
+  this.expect(tt._typeof);
+  node.argument = this.flow_parsePrimaryType();
+  return this.finishNode(node, "TypeofTypeAnnotation");
+};
+
+pp.flow_parseTupleType = function () {
+  var node = this.startNode();
+  node.types = [];
+  this.expect(tt.bracketL);
+  // We allow trailing commas
+  while (this.pos < this.input.length && this.type !== tt.bracketR) {
+    node.types.push(this.flow_parseType());
+    if (this.type === tt.bracketR) break;
+    this.expect(tt.comma);
+  }
+  this.expect(tt.bracketR);
+  return this.finishNode(node, "TupleTypeAnnotation");
+};
+
+pp.flow_parseFunctionTypeParam = function () {
+  var optional = false;
+  var node = this.startNode();
+  node.name = this.parseIdent();
+  if (this.eat(tt.question)) {
+    optional = true;
+  }
+  this.expect(tt.colon);
+  node.optional = optional;
+  node.typeAnnotation = this.flow_parseType();
+  return this.finishNode(node, "FunctionTypeParam");
+};
+
+pp.flow_parseFunctionTypeParams = function () {
+  var ret = { params: [], rest: null };
+  while (this.type === tt.name) {
+    ret.params.push(this.flow_parseFunctionTypeParam());
+    if (this.type !== tt.parenR) {
+      this.expect(tt.comma);
+    }
+  }
+  if (this.eat(tt.ellipsis)) {
+    ret.rest = this.flow_parseFunctionTypeParam();
+  }
+  return ret;
+};
+
+pp.flow_identToTypeAnnotation = function (start, node, id) {
+  switch (id.name) {
+    case "any":
+      return this.finishNode(node, "AnyTypeAnnotation");
+
+    case "bool":
+    case "boolean":
+      return this.finishNode(node, "BooleanTypeAnnotation");
+
+    case "number":
+      return this.finishNode(node, "NumberTypeAnnotation");
+
+    case "string":
+      return this.finishNode(node, "StringTypeAnnotation");
+
+    default:
+      return this.flow_parseGenericType(start, id);
+  }
+};
+
+// The parsing of types roughly parallels the parsing of expressions, and
+// primary types are kind of like primary expressions...they're the
+// primitives with which other types are constructed.
+pp.flow_parsePrimaryType = function () {
+  var typeIdentifier = null;
+  var params = null;
+  var returnType = null;
+  var start = this.markPosition();
+  var node = this.startNode();
+  var rest = null;
+  var tmp;
+  var typeParameters;
+  var token;
+  var type;
+  var isGroupedType = false;
+
+  switch (this.type) {
+    case tt.name:
+      return this.flow_identToTypeAnnotation(start, node, this.parseIdent());
+
+    case tt.braceL:
+      return this.flow_parseObjectType();
+
+    case tt.bracketL:
+      return this.flow_parseTupleType();
+
+    case tt.relational:
+      if (this.value === "<") {
+        node.typeParameters = this.flow_parseTypeParameterDeclaration();
+        this.expect(tt.parenL);
+        tmp = this.flow_parseFunctionTypeParams();
+        node.params = tmp.params;
+        node.rest = tmp.rest;
+        this.expect(tt.parenR);
+
+        this.expect(tt.arrow);
+
+        node.returnType = this.flow_parseType();
+
+        return this.finishNode(node, "FunctionTypeAnnotation");
+      }
+
+    case tt.parenL:
+      this.next();
+
+      // Check to see if this is actually a grouped type
+      if (this.type !== tt.parenR && this.type !== tt.ellipsis) {
+        if (this.type === tt.name) {
+          var token = this.lookahead().type;
+          isGroupedType = token !== tt.question && token !== tt.colon;
+        } else {
+          isGroupedType = true;
+        }
+      }
+
+      if (isGroupedType) {
+        type = this.flow_parseType();
+        this.expect(tt.parenR);
+
+        // If we see a => next then someone was probably confused about
+        // function types, so we can provide a better error message
+        if (this.eat(tt.arrow)) {
+          this.raise(node, "Unexpected token =>. It looks like " + "you are trying to write a function type, but you ended up " + "writing a grouped type followed by an =>, which is a syntax " + "error. Remember, function type parameters are named so function " + "types look like (name1: type1, name2: type2) => returnType. You " + "probably wrote (type1) => returnType");
+        }
+
+        return type;
+      }
+
+      tmp = this.flow_parseFunctionTypeParams();
+      node.params = tmp.params;
+      node.rest = tmp.rest;
+
+      this.expect(tt.parenR);
+
+      this.expect(tt.arrow);
+
+      node.returnType = this.flow_parseType();
+      node.typeParameters = null;
+
+      return this.finishNode(node, "FunctionTypeAnnotation");
+
+    case tt.string:
+      node.value = this.value;
+      node.raw = this.input.slice(this.start, this.end);
+      this.next();
+      return this.finishNode(node, "StringLiteralTypeAnnotation");
+
+    default:
+      if (this.type.keyword) {
+        switch (this.type.keyword) {
+          case "void":
+            return this.flow_parseVoidType();
+
+          case "typeof":
+            return this.flow_parseTypeofType();
+        }
+      }
+  }
+
+  this.unexpected();
+};
+
+pp.flow_parsePostfixType = function () {
+  var node = this.startNode();
+  var type = node.elementType = this.flow_parsePrimaryType();
+  if (this.type === tt.bracketL) {
+    this.expect(tt.bracketL);
+    this.expect(tt.bracketR);
+    return this.finishNode(node, "ArrayTypeAnnotation");
+  }
+  return type;
+};
+
+pp.flow_parsePrefixType = function () {
+  var node = this.startNode();
+  if (this.eat(tt.question)) {
+    node.typeAnnotation = this.flow_parsePrefixType();
+    return this.finishNode(node, "NullableTypeAnnotation");
+  }
+  return this.flow_parsePostfixType();
+};
+
+pp.flow_parseIntersectionType = function () {
+  var node = this.startNode();
+  var type = this.flow_parsePrefixType();
+  node.types = [type];
+  while (this.eat(tt.bitwiseAND)) {
+    node.types.push(this.flow_parsePrefixType());
+  }
+  return node.types.length === 1 ? type : this.finishNode(node, "IntersectionTypeAnnotation");
+};
+
+pp.flow_parseUnionType = function () {
+  var node = this.startNode();
+  var type = this.flow_parseIntersectionType();
+  node.types = [type];
+  while (this.eat(tt.bitwiseOR)) {
+    node.types.push(this.flow_parseIntersectionType());
+  }
+  return node.types.length === 1 ? type : this.finishNode(node, "UnionTypeAnnotation");
+};
+
+pp.flow_parseType = function () {
+  var oldInType = this.inType;
+  this.inType = true;
+  var type = this.flow_parseUnionType();
+  this.inType = oldInType;
+  return type;
+};
+
+pp.flow_parseTypeAnnotation = function () {
+  var node = this.startNode();
+
+  var oldInType = this.inType;
+  this.inType = true;
+  this.expect(tt.colon);
+  node.typeAnnotation = this.flow_parseType();
+  this.inType = oldInType;
+
+  return this.finishNode(node, "TypeAnnotation");
+};
+
+pp.flow_parseTypeAnnotatableIdentifier = function (requireTypeAnnotation, canBeOptionalParam) {
+  var node = this.startNode();
+  var ident = this.parseIdent();
+  var isOptionalParam = false;
+
+  if (canBeOptionalParam && this.eat(tt.question)) {
+    this.expect(tt.question);
+    isOptionalParam = true;
+  }
+
+  if (requireTypeAnnotation || this.type === tt.colon) {
+    ident.typeAnnotation = this.flow_parseTypeAnnotation();
+    this.finishNode(ident, ident.type);
+  }
+
+  if (isOptionalParam) {
+    ident.optional = true;
+    this.finishNode(ident, ident.type);
+  }
+
+  return ident;
+};
+
+acorn.plugins.flow = function (instance) {
+  // function name(): string {}
+  instance.extend("parseFunctionBody", function (inner) {
+    return function (node, allowExpression) {
+      if (this.type === tt.colon) {
+        node.returnType = this.flow_parseTypeAnnotation();
+      }
+
+      return inner.call(this, node, allowExpression);
+    };
+  });
+
+  instance.extend("parseStatement", function (inner) {
+    return function (declaration, topLevel) {
+      // strict mode handling of `interface` since it's a reserved word
+      if (this.strict && this.type === tt.name && this.value === "interface") {
+        var node = this.startNode();
+        this.next();
+        return this.flow_parseInterface(node);
+      } else {
+        return inner.call(this, declaration, topLevel);
+      }
+    };
+  });
+
+  instance.extend("parseExpressionStatement", function (inner) {
+    return function (node, expr) {
+      if (expr.type === "Identifier") {
+        if (expr.name === "declare") {
+          if (this.type === tt._class || this.type === tt.name || this.type === tt._function || this.type === tt._var) {
+            return this.flow_parseDeclare(node);
+          }
+        } else if (this.type === tt.name) {
+          if (expr.name === "interface") {
+            return this.flow_parseInterface(node);
+          } else if (expr.name === "type") {
+            return this.flow_parseTypeAlias(node);
+          }
+        }
+      }
+
+      return inner.call(this, node, expr);
+    };
+  });
+
+  instance.extend("shouldParseExportDeclaration", function (inner) {
+    return function () {
+      return this.isContextual("type") || inner.call(this);
+    };
+  });
+
+  instance.extend("parseParenItem", function (inner) {
+    return function (node, start) {
+      if (this.type === tt.colon) {
+        var typeCastNode = this.startNodeAt(start);
+        typeCastNode.expression = node;
+        typeCastNode.typeAnnotation = this.flow_parseTypeAnnotation();
+        return this.finishNode(typeCastNode, "TypeCastExpression");
+      } else {
+        return node;
+      }
+    };
+  });
+
+  instance.extend("parseClassId", function (inner) {
+    return function (node, isStatement) {
+      inner.call(this, node, isStatement);
+      if (this.isRelational("<")) {
+        node.typeParameters = this.flow_parseTypeParameterDeclaration();
+      }
+    };
+  });
+
+  instance.extend("readToken", function (inner) {
+    return function (code) {
+      if (this.inType && (code === 62 || code === 60)) {
+        return this.finishOp(tt.relational, 1);
+      } else {
+        return inner.call(this, code);
+      }
+    };
+  });
+
+  instance.extend("jsx_readToken", function (inner) {
+    return function () {
+      if (!this.inType) return inner.call(this);
+    };
+  });
+
+  instance.extend("parseParenArrowList", function (inner) {
+    return function (start, exprList, isAsync) {
+      for (var i = 0; i < exprList.length; i++) {
+        var listItem = exprList[i];
+        if (listItem.type === "TypeCastExpression") {
+          var expr = listItem.expression;
+          expr.typeAnnotation = listItem.typeAnnotation;
+          exprList[i] = expr;
+        }
+      }
+      return inner.call(this, start, exprList, isAsync);
+    };
+  });
+
+  instance.extend("parseClassMethod", function (inner) {
+    return function (classBody, method, isGenerator, isAsync) {
+      var classProperty = false;
+
+      if (this.type === tt.colon) {
+        method.typeAnnotation = this.flow_parseTypeAnnotation();
+        classProperty = true;
+      }
+
+      if (classProperty) {
+        this.semicolon();
+        classBody.body.push(this.finishNode(method, "ClassProperty"));
+      } else {
+        var typeParameters;
+        if (this.isRelational("<")) {
+          typeParameters = this.flow_parseTypeParameterDeclaration();
+        }
+        method.value = this.parseMethod(isGenerator, isAsync);
+        method.value.typeParameters = typeParameters;
+        classBody.body.push(this.finishNode(method, "MethodDefinition"));
+      }
+    };
+  });
+
+  instance.extend("parseClassSuper", function (inner) {
+    return function (node, isStatement) {
+      inner.call(this, node, isStatement);
+      if (node.superClass && this.isRelational("<")) {
+        node.superTypeParameters = this.flow_parseTypeParameterInstantiation();
+      }
+      if (this.isContextual("implements")) {
+        this.next();
+        var implemented = node["implements"] = [];
+        do {
+          var node = this.startNode();
+          node.id = this.parseIdent();
+          if (this.isRelational("<")) {
+            node.typeParameters = this.flow_parseTypeParameterInstantiation();
+          } else {
+            node.typeParameters = null;
+          }
+          implemented.push(this.finishNode(node, "ClassImplements"));
+        } while (this.eat(tt.comma));
+      }
+    };
+  });
+
+  instance.extend("parseObjPropValue", function (inner) {
+    return function (prop) {
+      var typeParameters;
+      if (this.isRelational("<")) {
+        typeParameters = this.flow_parseTypeParameterDeclaration();
+        if (this.type !== tt.parenL) this.unexpected();
+      }
+      inner.apply(this, arguments);
+      prop.value.typeParameters = typeParameters;
+    };
+  });
+
+  instance.extend("parseAssignableListItemTypes", function (inner) {
+    return function (param) {
+      if (this.eat(tt.question)) {
+        param.optional = true;
+      }
+      if (this.type === tt.colon) {
+        param.typeAnnotation = this.flow_parseTypeAnnotation();
+      }
+      this.finishNode(param, param.type);
+      return param;
+    };
+  });
+
+  instance.extend("parseImportSpecifiers", function (inner) {
+    return function (node) {
+      node.isType = false;
+      if (this.isContextual("type")) {
+        var start = this.markPosition();
+        var typeId = this.parseIdent();
+        if (this.type === tt.name && this.value !== "from" || this.type === tt.braceL || this.type === tt.star) {
+          node.isType = true;
+        } else {
+          node.specifiers.push(this.parseImportSpecifierDefault(typeId, start));
+          if (this.isContextual("from")) return;
+          this.eat(tt.comma);
+        }
+      }
+      inner.call(this, node);
+    };
+  });
+
+  // function foo<T>() {}
+  instance.extend("parseFunctionParams", function (inner) {
+    return function (node) {
+      if (this.isRelational("<")) {
+        node.typeParameters = this.flow_parseTypeParameterDeclaration();
+      }
+      inner.call(this, node);
+    };
+  });
+
+  // var foo: string = bar
+  instance.extend("parseVarHead", function (inner) {
+    return function (decl) {
+      inner.call(this, decl);
+      if (this.type === tt.colon) {
+        decl.id.typeAnnotation = this.flow_parseTypeAnnotation();
+        this.finishNode(decl.id, decl.id.type);
+      }
+    };
+  });
+};

lib/acorn/plugins/jsx.js

@@ -0,0 +1,637 @@
+"use strict";
+
+var acorn = require("..");
+
+var tt = acorn.tokTypes;
+var tc = acorn.tokContexts;
+
+tc.j_oTag = new acorn.TokContext("<tag", false);
+tc.j_cTag = new acorn.TokContext("</tag", false);
+tc.j_expr = new acorn.TokContext("<tag>...</tag>", true, true);
+
+tt.jsxName = new acorn.TokenType("jsxName");
+tt.jsxText = new acorn.TokenType("jsxText", { beforeExpr: true });
+tt.jsxTagStart = new acorn.TokenType("jsxTagStart");
+tt.jsxTagEnd = new acorn.TokenType("jsxTagEnd");
+
+tt.jsxTagStart.updateContext = function () {
+  this.context.push(tc.j_expr); // treat as beginning of JSX expression
+  this.context.push(tc.j_oTag); // start opening tag context
+  this.exprAllowed = false;
+};
+tt.jsxTagEnd.updateContext = function (prevType) {
+  var out = this.context.pop();
+  if (out === tc.j_oTag && prevType === tt.slash || out === tc.j_cTag) {
+    this.context.pop();
+    this.exprAllowed = this.curContext() === tc.j_expr;
+  } else {
+    this.exprAllowed = true;
+  }
+};
+
+var pp = acorn.Parser.prototype;
+
+// Reads inline JSX contents token.
+
+pp.jsx_readToken = function () {
+  var out = "",
+      chunkStart = this.pos;
+  for (;;) {
+    if (this.pos >= this.input.length) this.raise(this.start, "Unterminated JSX contents");
+    var ch = this.input.charCodeAt(this.pos);
+
+    switch (ch) {
+      case 60: // '<'
+      case 123:
+        // '{'
+        if (this.pos === this.start) {
+          if (ch === 60 && this.exprAllowed) {
+            ++this.pos;
+            return this.finishToken(tt.jsxTagStart);
+          }
+          return this.getTokenFromCode(ch);
+        }
+        out += this.input.slice(chunkStart, this.pos);
+        return this.finishToken(tt.jsxText, out);
+
+      case 38:
+        // '&'
+        out += this.input.slice(chunkStart, this.pos);
+        out += this.jsx_readEntity();
+        chunkStart = this.pos;
+        break;
+
+      default:
+        if (acorn.isNewLine(ch)) {
+          out += this.input.slice(chunkStart, this.pos);
+          ++this.pos;
+          if (ch === 13 && this.input.charCodeAt(this.pos) === 10) {
+            ++this.pos;
+            out += "\n";
+          } else {
+            out += String.fromCharCode(ch);
+          }
+          if (this.options.locations) {
+            ++this.curLine;
+            this.lineStart = this.pos;
+          }
+          chunkStart = this.pos;
+        } else {
+          ++this.pos;
+        }
+    }
+  }
+};
+
+pp.jsx_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 === 38) {
+      // '&'
+      out += this.input.slice(chunkStart, this.pos);
+      out += this.jsx_readEntity();
+      chunkStart = this.pos;
+    } else {
+      ++this.pos;
+    }
+  }
+  out += this.input.slice(chunkStart, this.pos++);
+  return this.finishToken(tt.string, out);
+};
+
+var XHTMLEntities = {
+  quot: "\"",
+  amp: "&",
+  apos: "'",
+  lt: "<",
+  gt: ">",
+  nbsp: " ",
+  iexcl: "¡",
+  cent: "¢",
+  pound: "£",
+  curren: "¤",
+  yen: "¥",
+  brvbar: "¦",
+  sect: "§",
+  uml: "¨",
+  copy: "©",
+  ordf: "ª",
+  laquo: "«",
+  not: "¬",
+  shy: "­",
+  reg: "®",
+  macr: "¯",
+  deg: "°",
+  plusmn: "±",
+  sup2: "²",
+  sup3: "³",
+  acute: "´",
+  micro: "µ",
+  para: "¶",
+  middot: "·",
+  cedil: "¸",
+  sup1: "¹",
+  ordm: "º",
+  raquo: "»",
+  frac14: "¼",
+  frac12: "½",
+  frac34: "¾",
+  iquest: "¿",
+  Agrave: "À",
+  Aacute: "Á",
+  Acirc: "Â",
+  Atilde: "Ã",
+  Auml: "Ä",
+  Aring: "Å",
+  AElig: "Æ",
+  Ccedil: "Ç",
+  Egrave: "È",
+  Eacute: "É",
+  Ecirc: "Ê",
+  Euml: "Ë",
+  Igrave: "Ì",
+  Iacute: "Í",
+  Icirc: "Î",
+  Iuml: "Ï",
+  ETH: "Ð",
+  Ntilde: "Ñ",
+  Ograve: "Ò",
+  Oacute: "Ó",
+  Ocirc: "Ô",
+  Otilde: "Õ",
+  Ouml: "Ö",
+  times: "×",
+  Oslash: "Ø",
+  Ugrave: "Ù",
+  Uacute: "Ú",
+  Ucirc: "Û",
+  Uuml: "Ü",
+  Yacute: "Ý",
+  THORN: "Þ",
+  szlig: "ß",
+  agrave: "à",
+  aacute: "á",
+  acirc: "â",
+  atilde: "ã",
+  auml: "ä",
+  aring: "å",
+  aelig: "æ",
+  ccedil: "ç",
+  egrave: "è",
+  eacute: "é",
+  ecirc: "ê",
+  euml: "ë",
+  igrave: "ì",
+  iacute: "í",
+  icirc: "î",
+  iuml: "ï",
+  eth: "ð",
+  ntilde: "ñ",
+  ograve: "ò",
+  oacute: "ó",
+  ocirc: "ô",
+  otilde: "õ",
+  ouml: "ö",
+  divide: "÷",
+  oslash: "ø",
+  ugrave: "ù",
+  uacute: "ú",
+  ucirc: "û",
+  uuml: "ü",
+  yacute: "ý",
+  thorn: "þ",
+  yuml: "ÿ",
+  OElig: "Œ",
+  oelig: "œ",
+  Scaron: "Š",
+  scaron: "š",
+  Yuml: "Ÿ",
+  fnof: "ƒ",
+  circ: "ˆ",
+  tilde: "˜",
+  Alpha: "Α",
+  Beta: "Β",
+  Gamma: "Γ",
+  Delta: "Δ",
+  Epsilon: "Ε",
+  Zeta: "Ζ",
+  Eta: "Η",
+  Theta: "Θ",
+  Iota: "Ι",
+  Kappa: "Κ",
+  Lambda: "Λ",
+  Mu: "Μ",
+  Nu: "Ν",
+  Xi: "Ξ",
+  Omicron: "Ο",
+  Pi: "Π",
+  Rho: "Ρ",
+  Sigma: "Σ",
+  Tau: "Τ",
+  Upsilon: "Υ",
+  Phi: "Φ",
+  Chi: "Χ",
+  Psi: "Ψ",
+  Omega: "Ω",
+  alpha: "α",
+  beta: "β",
+  gamma: "γ",
+  delta: "δ",
+  epsilon: "ε",
+  zeta: "ζ",
+  eta: "η",
+  theta: "θ",
+  iota: "ι",
+  kappa: "κ",
+  lambda: "λ",
+  mu: "μ",
+  nu: "ν",
+  xi: "ξ",
+  omicron: "ο",
+  pi: "π",
+  rho: "ρ",
+  sigmaf: "ς",
+  sigma: "σ",
+  tau: "τ",
+  upsilon: "υ",
+  phi: "φ",
+  chi: "χ",
+  psi: "ψ",
+  omega: "ω",
+  thetasym: "ϑ",
+  upsih: "ϒ",
+  piv: "ϖ",
+  ensp: " ",
+  emsp: " ",
+  thinsp: " ",
+  zwnj: "‌",
+  zwj: "‍",
+  lrm: "‎",
+  rlm: "‏",
+  ndash: "–",
+  mdash: "—",
+  lsquo: "‘",
+  rsquo: "’",
+  sbquo: "‚",
+  ldquo: "“",
+  rdquo: "”",
+  bdquo: "„",
+  dagger: "†",
+  Dagger: "‡",
+  bull: "•",
+  hellip: "…",
+  permil: "‰",
+  prime: "′",
+  Prime: "″",
+  lsaquo: "‹",
+  rsaquo: "›",
+  oline: "‾",
+  frasl: "⁄",
+  euro: "€",
+  image: "ℑ",
+  weierp: "℘",
+  real: "ℜ",
+  trade: "™",
+  alefsym: "ℵ",
+  larr: "←",
+  uarr: "↑",
+  rarr: "→",
+  darr: "↓",
+  harr: "↔",
+  crarr: "↵",
+  lArr: "⇐",
+  uArr: "⇑",
+  rArr: "⇒",
+  dArr: "⇓",
+  hArr: "⇔",
+  forall: "∀",
+  part: "∂",
+  exist: "∃",
+  empty: "∅",
+  nabla: "∇",
+  isin: "∈",
+  notin: "∉",
+  ni: "∋",
+  prod: "∏",
+  sum: "∑",
+  minus: "−",
+  lowast: "∗",
+  radic: "√",
+  prop: "∝",
+  infin: "∞",
+  ang: "∠",
+  and: "∧",
+  or: "∨",
+  cap: "∩",
+  cup: "∪",
+  int: "∫",
+  there4: "∴",
+  sim: "∼",
+  cong: "≅",
+  asymp: "≈",
+  ne: "≠",
+  equiv: "≡",
+  le: "≤",
+  ge: "≥",
+  sub: "⊂",
+  sup: "⊃",
+  nsub: "⊄",
+  sube: "⊆",
+  supe: "⊇",
+  oplus: "⊕",
+  otimes: "⊗",
+  perp: "⊥",
+  sdot: "⋅",
+  lceil: "⌈",
+  rceil: "⌉",
+  lfloor: "⌊",
+  rfloor: "⌋",
+  lang: "〈",
+  rang: "〉",
+  loz: "◊",
+  spades: "♠",
+  clubs: "♣",
+  hearts: "♥",
+  diams: "♦"
+};
+
+var hexNumber = /^[\da-fA-F]+$/;
+var decimalNumber = /^\d+$/;
+
+pp.jsx_readEntity = function () {
+  var str = "",
+      count = 0,
+      entity;
+  var ch = this.input[this.pos];
+  if (ch !== "&") this.raise(this.pos, "Entity must start with an ampersand");
+  var startPos = ++this.pos;
+  while (this.pos < this.input.length && count++ < 10) {
+    ch = this.input[this.pos++];
+    if (ch === ";") {
+      if (str[0] === "#") {
+        if (str[1] === "x") {
+          str = str.substr(2);
+          if (hexNumber.test(str)) entity = String.fromCharCode(parseInt(str, 16));
+        } else {
+          str = str.substr(1);
+          if (decimalNumber.test(str)) entity = String.fromCharCode(parseInt(str, 10));
+        }
+      } else {
+        entity = XHTMLEntities[str];
+      }
+      break;
+    }
+    str += ch;
+  }
+  if (!entity) {
+    this.pos = startPos;
+    return "&";
+  }
+  return entity;
+};
+
+// Read a JSX identifier (valid tag or attribute name).
+//
+// Optimized version since JSX identifiers can't contain
+// escape characters and so can be read as single slice.
+// Also assumes that first character was already checked
+// by isIdentifierStart in readToken.
+
+pp.jsx_readWord = function () {
+  var ch,
+      start = this.pos;
+  do {
+    ch = this.input.charCodeAt(++this.pos);
+  } while (acorn.isIdentifierChar(ch) || ch === 45); // '-'
+  return this.finishToken(tt.jsxName, this.input.slice(start, this.pos));
+};
+
+// Transforms JSX element name to string.
+
+function getQualifiedJSXName(object) {
+  if (object.type === "JSXIdentifier") return object.name;
+
+  if (object.type === "JSXNamespacedName") return object.namespace.name + ":" + object.name.name;
+
+  if (object.type === "JSXMemberExpression") return getQualifiedJSXName(object.object) + "." + getQualifiedJSXName(object.property);
+}
+
+// Parse next token as JSX identifier
+
+pp.jsx_parseIdentifier = function () {
+  var node = this.startNode();
+  if (this.type === tt.jsxName) node.name = this.value;else if (this.type.keyword) node.name = this.type.keyword;else this.unexpected();
+  this.next();
+  return this.finishNode(node, "JSXIdentifier");
+};
+
+// Parse namespaced identifier.
+
+pp.jsx_parseNamespacedName = function () {
+  var start = this.markPosition();
+  var name = this.jsx_parseIdentifier();
+  if (!this.eat(tt.colon)) return name;
+  var node = this.startNodeAt(start);
+  node.namespace = name;
+  node.name = this.jsx_parseIdentifier();
+  return this.finishNode(node, "JSXNamespacedName");
+};
+
+// Parses element name in any form - namespaced, member
+// or single identifier.
+
+pp.jsx_parseElementName = function () {
+  var start = this.markPosition();
+  var node = this.jsx_parseNamespacedName();
+  while (this.eat(tt.dot)) {
+    var newNode = this.startNodeAt(start);
+    newNode.object = node;
+    newNode.property = this.jsx_parseIdentifier();
+    node = this.finishNode(newNode, "JSXMemberExpression");
+  }
+  return node;
+};
+
+// Parses any type of JSX attribute value.
+
+pp.jsx_parseAttributeValue = function () {
+  switch (this.type) {
+    case tt.braceL:
+      var node = this.jsx_parseExpressionContainer();
+      if (node.expression.type === "JSXEmptyExpression") this.raise(node.start, "JSX attributes must only be assigned a non-empty expression");
+      return node;
+
+    case tt.jsxTagStart:
+    case tt.string:
+      return this.parseExprAtom();
+
+    default:
+      this.raise(this.start, "JSX value should be either an expression or a quoted JSX text");
+  }
+};
+
+// JSXEmptyExpression is unique type since it doesn't actually parse anything,
+// and so it should start at the end of last read token (left brace) and finish
+// at the beginning of the next one (right brace).
+
+pp.jsx_parseEmptyExpression = function () {
+  var tmp = this.start;
+  this.start = this.lastTokEnd;
+  this.lastTokEnd = tmp;
+
+  tmp = this.startLoc;
+  this.startLoc = this.lastTokEndLoc;
+  this.lastTokEndLoc = tmp;
+
+  return this.finishNode(this.startNode(), "JSXEmptyExpression");
+};
+
+// Parses JSX expression enclosed into curly brackets.
+
+pp.jsx_parseExpressionContainer = function () {
+  var node = this.startNode();
+  this.next();
+  node.expression = this.type === tt.braceR ? this.jsx_parseEmptyExpression() : this.parseExpression();
+  this.expect(tt.braceR);
+  return this.finishNode(node, "JSXExpressionContainer");
+};
+
+// Parses following JSX attribute name-value pair.
+
+pp.jsx_parseAttribute = function () {
+  var node = this.startNode();
+  if (this.eat(tt.braceL)) {
+    this.expect(tt.ellipsis);
+    node.argument = this.parseMaybeAssign();
+    this.expect(tt.braceR);
+    return this.finishNode(node, "JSXSpreadAttribute");
+  }
+  node.name = this.jsx_parseNamespacedName();
+  node.value = this.eat(tt.eq) ? this.jsx_parseAttributeValue() : null;
+  return this.finishNode(node, "JSXAttribute");
+};
+
+// Parses JSX opening tag starting after '<'.
+
+pp.jsx_parseOpeningElementAt = function (start) {
+  var node = this.startNodeAt(start);
+  node.attributes = [];
+  node.name = this.jsx_parseElementName();
+  while (this.type !== tt.slash && this.type !== tt.jsxTagEnd) node.attributes.push(this.jsx_parseAttribute());
+  node.selfClosing = this.eat(tt.slash);
+  this.expect(tt.jsxTagEnd);
+  return this.finishNode(node, "JSXOpeningElement");
+};
+
+// Parses JSX closing tag starting after '</'.
+
+pp.jsx_parseClosingElementAt = function (start) {
+  var node = this.startNodeAt(start);
+  node.name = this.jsx_parseElementName();
+  this.expect(tt.jsxTagEnd);
+  return this.finishNode(node, "JSXClosingElement");
+};
+
+// Parses entire JSX element, including it's opening tag
+// (starting after '<'), attributes, contents and closing tag.
+
+pp.jsx_parseElementAt = function (start) {
+  var node = this.startNodeAt(start);
+  var children = [];
+  var openingElement = this.jsx_parseOpeningElementAt(start);
+  var closingElement = null;
+
+  if (!openingElement.selfClosing) {
+    contents: for (;;) {
+      switch (this.type) {
+        case tt.jsxTagStart:
+          start = this.markPosition();
+          this.next();
+          if (this.eat(tt.slash)) {
+            closingElement = this.jsx_parseClosingElementAt(start);
+            break contents;
+          }
+          children.push(this.jsx_parseElementAt(start));
+          break;
+
+        case tt.jsxText:
+          children.push(this.parseExprAtom());
+          break;
+
+        case tt.braceL:
+          children.push(this.jsx_parseExpressionContainer());
+          break;
+
+        default:
+          this.unexpected();
+      }
+    }
+    if (getQualifiedJSXName(closingElement.name) !== getQualifiedJSXName(openingElement.name)) this.raise(closingElement.start, "Expected corresponding JSX closing tag for <" + getQualifiedJSXName(openingElement.name) + ">");
+  }
+
+  node.openingElement = openingElement;
+  node.closingElement = closingElement;
+  node.children = children;
+  return this.finishNode(node, "JSXElement");
+};
+
+// Parses entire JSX element from current position.
+
+pp.jsx_parseElement = function () {
+  var start = this.markPosition();
+  this.next();
+  return this.jsx_parseElementAt(start);
+};
+
+acorn.plugins.jsx = function (instance) {
+  instance.extend("parseExprAtom", function (inner) {
+    return function (refShortHandDefaultPos) {
+      if (this.type === tt.jsxText) return this.parseLiteral(this.value);else if (this.type === tt.jsxTagStart) return this.jsx_parseElement();else return inner.call(this, refShortHandDefaultPos);
+    };
+  });
+
+  instance.extend("readToken", function (inner) {
+    return function (code) {
+      var context = this.curContext();
+
+      if (context === tc.j_expr) return this.jsx_readToken();
+
+      if (context === tc.j_oTag || context === tc.j_cTag) {
+        if (acorn.isIdentifierStart(code)) return this.jsx_readWord();
+
+        if (code == 62) {
+          ++this.pos;
+          return this.finishToken(tt.jsxTagEnd);
+        }
+
+        if ((code === 34 || code === 39) && context == tc.j_oTag) return this.jsx_readString(code);
+      }
+
+      if (code === 60 && this.exprAllowed) {
+        ++this.pos;
+        return this.finishToken(tt.jsxTagStart);
+      }
+      return inner.call(this, code);
+    };
+  });
+
+  instance.extend("updateContext", function (inner) {
+    return function (prevType) {
+      if (this.type == tt.braceL) {
+        var curContext = this.curContext();
+        if (curContext == tc.j_oTag) this.context.push(tc.b_expr);else if (curContext == tc.j_expr) this.context.push(tc.b_tmpl);else inner.call(this, prevType);
+        this.exprAllowed = true;
+      } else if (this.type === tt.slash && prevType === tt.jsxTagStart) {
+        this.context.length -= 2; // do not consider JSX expr -> JSX open tag -> ... anymore
+        this.context.push(tc.j_cTag); // reconsider as closing tag context
+        this.exprAllowed = false;
+      } else {
+        return inner.call(this, prevType);
+      }
+    };
+  });
+};

lib/acorn/src/.subladf.tmp

@@ -0,0 +1,668 @@
+// 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
+
+import {types as tt} from "./tokentype"
+import {Parser} from "./state"
+import {reservedWords} from "./identifier"
+import {has} from "./util"
+
+const pp = 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) return
+  let key = prop.key, name
+  switch (key.type) {
+  case "Identifier": name = key.name; break
+  case "Literal": name = String(key.value); break
+  default: return
+  }
+  let kind = prop.kind || "init", other
+  if (has(propHash, name)) {
+    other = propHash[name]
+    let isGetSet = kind !== "init"
+    if ((this.strict || isGetSet) && other[kind] || !(isGetSet ^ other.init))
+      this.raise(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, refShorthandDefaultPos) {
+  let start = this.markPosition()
+  let expr = this.parseMaybeAssign(noIn, refShorthandDefaultPos)
+  if (this.type === tt.comma) {
+    let node = this.startNodeAt(start)
+    node.expressions = [expr]
+    while (this.eat(tt.comma)) node.expressions.push(this.parseMaybeAssign(noIn, refShorthandDefaultPos))
+    return this.finishNode(node, "SequenceExpression")
+  }
+  return expr
+}
+
+// Parse an assignment expression. This includes applications of
+// operators like `+=`.
+
+pp.parseMaybeAssign = function(noIn, refShorthandDefaultPos) {
+  if (this.type == tt._yield && this.inGenerator) return this.parseYield()
+
+  let failOnShorthandAssign
+  if (!refShorthandDefaultPos) {
+    refShorthandDefaultPos = {start: 0}
+    failOnShorthandAssign = true
+  } else {
+    failOnShorthandAssign = false
+  }
+  let start = this.markPosition()
+  let left = this.parseMaybeConditional(noIn, refShorthandDefaultPos)
+  if (this.type.isAssign) {
+    let node = this.startNodeAt(start)
+    node.operator = this.value
+    node.left = this.type === tt.eq ? this.toAssignable(left) : left
+    refShorthandDefaultPos.start = 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 (failOnShorthandAssign && refShorthandDefaultPos.start) {
+    this.unexpected(refShorthandDefaultPos.start)
+  }
+  return left
+}
+
+// Parse a ternary conditional (`?:`) operator.
+
+pp.parseMaybeConditional = function(noIn, refShorthandDefaultPos) {
+  let start = this.markPosition()
+  let expr = this.parseExprOps(noIn, refShorthandDefaultPos)
+  if (refShorthandDefaultPos && refShorthandDefaultPos.start) return expr
+  if (this.eat(tt.question)) {
+    let node = this.startNodeAt(start)
+    node.test = expr
+    node.consequent = this.parseMaybeAssign()
+    this.expect(tt.colon)
+    node.alternate = this.parseMaybeAssign(noIn)
+    return this.finishNode(node, "ConditionalExpression")
+  }
+  return expr
+}
+
+// Start the precedence parser.
+
+pp.parseExprOps = function(noIn, refShorthandDefaultPos) {
+  let start = this.markPosition()
+  let expr = this.parseMaybeUnary(refShorthandDefaultPos)
+  if (refShorthandDefaultPos && refShorthandDefaultPos.start) return expr
+  return this.parseExprOp(expr, start, -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, leftStart, minPrec, noIn) {
+  let prec = this.type.binop
+  if (prec != null && (!noIn || this.type !== tt._in)) {
+    if (prec > minPrec) {
+      let node = this.startNodeAt(leftStart)
+      node.left = left
+      node.operator = this.value
+      let op = this.type
+      this.next()
+      let start = this.markPosition()
+      node.right = this.parseExprOp(this.parseMaybeUnary(), start, op.rightAssociative ? (prec - 1) : prec, noIn)
+      this.finishNode(node, (op === tt.logicalOR || op === tt.logicalAND) ? "LogicalExpression" : "BinaryExpression")
+      return this.parseExprOp(node, leftStart, minPrec, noIn)
+    }
+  }
+  return left
+}
+
+// Parse unary operators, both prefix and postfix.
+
+pp.parseMaybeUnary = function(refShorthandDefaultPos) {
+  if (this.type.prefix) {
+    let node = this.startNode(), update = this.type === tt.incDec
+    node.operator = this.value
+    node.prefix = true
+    this.next()
+    node.argument = this.parseMaybeUnary()
+    if (refShorthandDefaultPos && refShorthandDefaultPos.start) this.unexpected(refShorthandDefaultPos.start)
+    if (update) this.checkLVal(node.argument)
+    else if (this.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")
+  }
+  let start = this.markPosition()
+  let expr = this.parseExprSubscripts(refShorthandDefaultPos)
+  if (refShorthandDefaultPos && refShorthandDefaultPos.start) return expr
+  while (this.type.postfix && !this.canInsertSemicolon()) {
+    let node = this.startNodeAt(start)
+    node.operator = this.value
+    node.prefix = false
+    node.argument = expr
+    this.checkLVal(expr)
+    this.next()
+    expr = this.finishNode(node, "UpdateExpression")
+  }
+  return expr
+}
+
+// Parse call, dot, and `[]`-subscript expressions.
+
+pp.parseExprSubscripts = function(refShorthandDefaultPos) {
+  let start = this.markPosition()
+  let expr = this.parseExprAtom(refShorthandDefaultPos)
+  if (refShorthandDefaultPos && refShorthandDefaultPos.start) return expr
+  return this.parseSubscripts(expr, start)
+}
+
+pp.parseSubscripts = function(base, start, noCalls) {
+  if (this.eat(tt.dot)) {
+    let node = this.startNodeAt(start)
+    node.object = base
+    node.property = this.parseIdent(true)
+    node.computed = false
+    return this.parseSubscripts(this.finishNode(node, "MemberExpression"), start, noCalls)
+  } else if (this.eat(tt.bracketL)) {
+    let node = this.startNodeAt(start)
+    node.object = base
+    node.property = this.parseExpression()
+    node.computed = true
+    this.expect(tt.bracketR)
+    return this.parseSubscripts(this.finishNode(node, "MemberExpression"), start, noCalls)
+  } else if (!noCalls && this.eat(tt.parenL)) {
+    let node = this.startNodeAt(start)
+    node.callee = base
+    node.arguments = this.parseExprList(tt.parenR, false)
+    return this.parseSubscripts(this.finishNode(node, "CallExpression"), start, noCalls)
+  } else if (this.type === tt.backQuote) {
+    let node = this.startNodeAt(start)
+    node.tag = base
+    node.quasi = this.parseTemplate()
+    return this.parseSubscripts(this.finishNode(node, "TaggedTemplateExpression"), start, noCalls)
+  } return base
+}
+
+// Parse an atomic expression — either a single token that is an
+// expression, an expression started by a keyword like `function` or
+// `new`, or an expression wrapped in punctuation like `()`, `[]`,
+// or `{}`.
+
+pp.parseExprAtom = function(refShorthandDefaultPos) {
+  let node
+  switch (this.type) {
+  case tt._this:
+  case tt._super:
+    let type = this.type === tt._this ? "ThisExpression" : "Super"
+    node = this.startNode()
+    this.next()
+    return this.finishNode(node, type)
+
+  case tt._yield:
+    if (this.inGenerator) unexpected()
+
+  case tt.name:
+    let start = this.markPosition()
+    let id = this.parseIdent(this.type !== tt.name)
+    if (!this.canInsertSemicolon() && this.eat(tt.arrow)) {
+      return this.parseArrowExpression(this.startNodeAt(start), [id])
+    }
+    return id
+
+  case tt.regexp:
+    let value = this.value
+    node = this.parseLiteral(value.value)
+    node.regex = {pattern: value.pattern, flags: value.flags}
+    return node
+
+  case tt.num: case tt.string:
+    return this.parseLiteral(this.value)
+
+  case tt._null: case tt._true: case tt._false:
+    node = this.startNode()
+    node.value = this.type === tt._null ? null : this.type === tt._true
+    node.raw = this.type.keyword
+    this.next()
+    return this.finishNode(node, "Literal")
+
+  case tt.parenL:
+    return this.parseParenAndDistinguishExpression()
+
+  case tt.bracketL:
+    node = this.startNode()
+    this.next()
+    // check whether this is array comprehension or regular array
+    if ((this.options.ecmaVersion >= 7 || this.option.features["es7.comprehensions"]) && this.type === tt._for) {
+      return this.parseComprehension(node, false)
+    }
+    node.elements = this.parseExprList(tt.bracketR, true, true, refShorthandDefaultPos)
+    return this.finishNode(node, "ArrayExpression")
+
+  case tt.braceL:
+    return this.parseObj(false, refShorthandDefaultPos)
+
+  case tt._function:
+    node = this.startNode()
+    this.next()
+    return this.parseFunction(node, false)
+
+  case tt._class:
+    return this.parseClass(this.startNode(), false)
+
+  case tt._new:
+    return this.parseNew()
+
+  case tt.backQuote:
+    return this.parseTemplate()
+
+  default:
+    this.unexpected()
+  }
+}
+
+pp.parseLiteral = function(value) {
+  let 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(tt.parenL)
+  let val = this.parseExpression()
+  this.expect(tt.parenR)
+  return val
+}
+
+pp.parseParenAndDistinguishExpression = function(start, isAsync) {
+  start = start || this.markPosition()
+  var val
+  if (this.options.ecmaVersion >= 6) {
+    this.next()
+
+    if ((this.options.features["es7.comprehensions"] || this.options.ecmaVersion >= 7) && this.type === tt._for) {
+      return this.parseComprehension(this.startNodeAt(start), true)
+    }
+
+    var innerStart = this.markPosition(), exprList = [], first = true
+    var refShorthandDefaultPos = {start: 0}, spreadStart, innerParenStart
+    while (this.type !== tt.parenR) {
+      first ? first = false : this.expect(tt.comma)
+      if (this.type === tt.ellipsis) {
+        var spreadNodeStart = this.markPosition()
+        spreadStart = this.start
+        exprList.push(this.parseParenItem(this.parseRest(), spreadNodeStart))
+        break
+      } else {
+        if (this.type === tt.parenL && !innerParenStart) {
+          innerParenStart = this.start
+        }
+        exprList.push(this.parseMaybeAssign(false, refShorthandDefaultPos, this.parseParenItem))
+      }
+    }
+    var innerEnd = this.markPosition()
+    this.expect(tt.parenR)
+
+    if (!this.canInsertSemicolon() && this.eat(tt.arrow)) {
+      if (innerParenStart) this.unexpected(innerParenStart)
+      return this.parseParenArrowList(start, exprList, isAsync)
+    }
+
+    if (!exprList.length) this.unexpected(this.lastTokStart)
+    if (spreadStart) this.unexpected(spreadStart)
+    if (refShorthandDefaultPos.start) this.unexpected(refShorthandDefaultPos.start)
+
+    if (exprList.length > 1) {
+      val = this.startNodeAt(innerStart)
+      val.expressions = exprList
+      this.finishNodeAt(val, "SequenceExpression", innerEnd)
+    } else {
+      val = exprList[0]
+    }
+  } else {
+    val = this.parseParenExpression()
+  }
+
+  if (this.options.preserveParens) {
+    var par = this.startNodeAt(start)
+    par.expression = val
+    return this.finishNode(par, "ParenthesizedExpression")
+  } else {
+    return val
+  }
+}
+
+pp.parseParenArrowList = function (start, exprList, isAsync) {
+  return this.parseArrowExpression(this.startNodeAt(start), exprList, isAsync)
+}
+
+pp.parseParenItem = function (node, start) {
+  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
+
+const empty = []
+
+pp.parseNew = function() {
+  let node = this.startNode()
+  let meta = this.parseIdent(true)
+  if (this.options.ecmaVersion >= 6 && this.eat(tt.dot)) {
+    node.meta = meta
+    node.property = this.parseIdent(true)
+    if (node.property.name !== "target")
+      this.raise(node.property.start, "The only valid meta property for new is new.target")
+    return this.finishNode(node, "MetaProperty")
+  }
+  let start = this.markPosition()
+  node.callee = this.parseSubscripts(this.parseExprAtom(), start, true)
+  if (this.eat(tt.parenL)) node.arguments = this.parseExprList(tt.parenR, false)
+  else node.arguments = empty
+  return this.finishNode(node, "NewExpression")
+}
+
+// Parse template expression.
+
+pp.parseTemplateElement = function() {
+  let elem = this.startNode()
+  elem.value = {
+    raw: this.input.slice(this.start, this.end),
+    cooked: this.value
+  }
+  this.next()
+  elem.tail = this.type === tt.backQuote
+  return this.finishNode(elem, "TemplateElement")
+}
+
+pp.parseTemplate = function() {
+  let node = this.startNode()
+  this.next()
+  node.expressions = []
+  let curElt = this.parseTemplateElement()
+  node.quasis = [curElt]
+  while (!curElt.tail) {
+    this.expect(tt.dollarBraceL)
+    node.expressions.push(this.parseExpression())
+    this.expect(tt.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) {
+  let node = this.startNode(), first = true, propHash = {}
+  node.properties = []
+  this.next()
+  while (!this.eat(tt.braceR)) {
+    if (!first) {
+      this.expect(tt.comma)
+      if (this.afterTrailingComma(tt.braceR)) break
+    } else first = false
+
+    let prop = this.startNode(), isGenerator, start
+    if (this.options.ecmaVersion >= 6) {
+      prop.method = false
+      prop.shorthand = false
+      if (isPattern || refShorthandDefaultPos)
+        start = this.markPosition()
+      if (!isPattern)
+        isGenerator = this.eat(tt.star)
+    }
+    this.parsePropertyName(prop)
+    if (this.eat(tt.colon)) {
+      prop.value = isPattern ? this.parseMaybeDefault() : this.parseMaybeAssign(false, refShorthandDefaultPos)
+      prop.kind = "init"
+    } else if (this.options.ecmaVersion >= 6 && this.type === tt.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 != tt.comma && this.type != tt.braceR)) {
+      if (isGenerator || isPattern) this.unexpected()
+      prop.kind = prop.key.name
+      this.parsePropertyName(prop)
+      prop.value = this.parseMethod(false)
+    } else if (this.options.ecmaVersion >= 6 && !prop.computed && prop.key.type === "Identifier") {
+      prop.kind = "init"
+      if (isPattern) {
+        if (this.isKeyword(prop.key.name) ||
+            (this.strict && (reservedWords.strictBind(prop.key.name) || reservedWords.strict(prop.key.name))) ||
+            (!this.options.allowReserved && this.isReservedWord(prop.key.name)))
+          this.raise(prop.key.start, "Binding " + prop.key.name)
+        prop.value = this.parseMaybeDefault(start, prop.key)
+      } else if (this.type === tt.eq && refShorthandDefaultPos) {
+        if (!refShorthandDefaultPos.start)
+          refShorthandDefaultPos.start = this.start
+        prop.value = this.parseMaybeDefault(start, prop.key)
+      } else {
+        prop.value = prop.key
+      }
+      prop.shorthand = true
+    } else this.unexpected()
+
+    this.checkPropClash(prop, propHash)
+    node.properties.push(this.finishNode(prop, "Property"))
+  }
+  return this.finishNode(node, isPattern ? "ObjectPattern" : "ObjectExpression")
+}
+
+pp.parsePropertyName = function(prop) {
+  if (this.options.ecmaVersion >= 6) {
+    if (this.eat(tt.bracketL)) {
+      prop.computed = true
+      prop.key = this.parseMaybeAssign()
+      this.expect(tt.bracketR)
+      return
+    } else {
+      prop.computed = false
+    }
+  }
+  prop.key = (this.type === tt.num || this.type === tt.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) {
+  let node = this.startNode()
+  this.initFunction(node)
+  this.expect(tt.parenL)
+  node.params = this.parseBindingList(tt.parenR, false, false)
+  let allowExpressionBody
+  if (this.options.ecmaVersion >= 6) {
+    node.generator = isGenerator
+    allowExpressionBody = true
+  } else {
+    allowExpressionBody = false
+  }
+  this.parseFunctionBody(node, allowExpressionBody)
+  return this.finishNode(node, "FunctionExpression")
+}
+
+// Parse arrow function expression with given parameters.
+
+pp.parseArrowExpression = function(node, params) {
+  this.initFunction(node)
+  node.params = this.toAssignableList(params, true)
+  this.parseFunctionBody(node, true)
+  return this.finishNode(node, "ArrowFunctionExpression")
+}
+
+// Parse function body and check parameters.
+
+pp.parseFunctionBody = function(node, allowExpression) {
+  let isExpression = allowExpression && this.type !== tt.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).
+    let oldInFunc = this.inFunction, oldInGen = this.inGenerator, oldLabels = this.labels
+    this.inFunction = true; this.inGenerator = node.generator; this.labels = []
+    node.body = this.parseBlock(true)
+    node.expression = false
+    this.inFunction = oldInFunc; this.inGenerator = oldInGen; 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])) {
+    let nameHash = {}, oldStrict = this.strict
+    this.strict = true
+    if (node.id)
+      this.checkLVal(node.id, true)
+    for (let i = 0; i < node.params.length; i++)
+      this.checkLVal(node.params[i], true, nameHash)
+    this.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, allowTrailingComma, allowEmpty, refShorthandDefaultPos) {
+  let elts = [], first = true
+  while (!this.eat(close)) {
+    if (!first) {
+      this.expect(tt.comma)
+      if (allowTrailingComma && this.afterTrailingComma(close)) break
+    } else first = false
+
+    if (allowEmpty && this.type === tt.comma) {
+      elts.push(null)
+    } else {
+      if (this.type === tt.ellipsis)
+        elts.push(this.parseSpread(refShorthandDefaultPos))
+      else
+        elts.push(this.parseMaybeAssign(false, refShorthandDefaultPos))
+    }
+  }
+  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) {
+  let node = this.startNode()
+  if (liberal && this.options.allowReserved == "never") liberal = false
+  if (this.type === tt.name) {
+    if (!liberal &&
+        ((!this.options.allowReserved && this.isReservedWord(this.value)) ||
+         (this.strict && reservedWords.strict(this.value)) &&
+         (this.options.ecmaVersion >= 6 ||
+          this.input.slice(this.start, this.end).indexOf("\\") == -1)))
+      this.raise(this.start, "The keyword '" + this.value + "' is reserved")
+    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() {
+  let node = this.startNode()
+  this.next()
+  if (this.type == tt.semi || this.canInsertSemicolon() || (this.type != tt.star && !this.type.startsExpr)) {
+    node.delegate = false
+    node.argument = null
+  } else {
+    node.delegate = this.eat(tt.star)
+    node.argument = this.parseMaybeAssign()
+  }
+  return this.finishNode(node, "YieldExpression")
+}
+
+// Parses array and generator comprehensions.
+
+pp.parseComprehension = function(node, isGenerator) {
+  node.blocks = []
+  while (this.type === tt._for) {
+    let block = this.startNode()
+    this.next()
+    this.expect(tt.parenL)
+    block.left = this.parseBindingAtom()
+    this.checkLVal(block.left, true)
+    this.expectContextual("of")
+    block.right = this.parseExpression()
+    this.expect(tt.parenR)
+    node.blocks.push(this.finishNode(block, "ComprehensionBlock"))
+  }
+  node.filter = this.eat(tt._if) ? this.parseParenExpression() : null
+  node.body = this.parseExpression()
+  this.expect(isGenerator ? tt.parenR : tt.bracketR)
+  node.generator = isGenerator
+  return this.finishNode(node, "ComprehensionExpression")
+}

lib/acorn/src/expression.js

@@ -0,0 +1,744 @@
+// 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 tt = require("./tokentype").types;
+
+var Parser = require("./state").Parser;
+
+var reservedWords = require("./identifier").reservedWords;
+
+var has = require("./util").has;
+
+var pp = 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) return;
+  var key = prop.key,
+      name = undefined;
+  switch (key.type) {
+    case "Identifier":
+      name = key.name;break;
+    case "Literal":
+      name = String(key.value);break;
+    default:
+      return;
+  }
+  var kind = prop.kind || "init",
+      other = undefined;
+  if (has(propHash, name)) {
+    other = propHash[name];
+    var isGetSet = kind !== "init";
+    if ((this.strict || isGetSet) && other[kind] || !(isGetSet ^ other.init)) this.raise(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, refShorthandDefaultPos) {
+  var start = this.markPosition();
+  var expr = this.parseMaybeAssign(noIn, refShorthandDefaultPos);
+  if (this.type === tt.comma) {
+    var node = this.startNodeAt(start);
+    node.expressions = [expr];
+    while (this.eat(tt.comma)) node.expressions.push(this.parseMaybeAssign(noIn, refShorthandDefaultPos));
+    return this.finishNode(node, "SequenceExpression");
+  }
+  return expr;
+};
+
+// Parse an assignment expression. This includes applications of
+// operators like `+=`.
+
+pp.parseMaybeAssign = function (noIn, refShorthandDefaultPos, afterLeftParse) {
+  if (this.type == tt._yield && this.inGenerator) return this.parseYield();
+
+  var failOnShorthandAssign = undefined;
+  if (!refShorthandDefaultPos) {
+    refShorthandDefaultPos = { start: 0 };
+    failOnShorthandAssign = true;
+  } else {
+    failOnShorthandAssign = false;
+  }
+  var start = this.markPosition();
+  var left = this.parseMaybeConditional(noIn, refShorthandDefaultPos);
+  if (afterLeftParse) left = afterLeftParse.call(this, left, start);
+  if (this.type.isAssign) {
+    var node = this.startNodeAt(start);
+    node.operator = this.value;
+    node.left = this.type === tt.eq ? this.toAssignable(left) : left;
+    refShorthandDefaultPos.start = 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 (failOnShorthandAssign && refShorthandDefaultPos.start) {
+    this.unexpected(refShorthandDefaultPos.start);
+  }
+  return left;
+};
+
+// Parse a ternary conditional (`?:`) operator.
+
+pp.parseMaybeConditional = function (noIn, refShorthandDefaultPos) {
+  var start = this.markPosition();
+  var expr = this.parseExprOps(noIn, refShorthandDefaultPos);
+  if (refShorthandDefaultPos && refShorthandDefaultPos.start) return expr;
+  if (this.eat(tt.question)) {
+    var node = this.startNodeAt(start);
+    node.test = expr;
+    node.consequent = this.parseMaybeAssign();
+    this.expect(tt.colon);
+    node.alternate = this.parseMaybeAssign(noIn);
+    return this.finishNode(node, "ConditionalExpression");
+  }
+  return expr;
+};
+
+// Start the precedence parser.
+
+pp.parseExprOps = function (noIn, refShorthandDefaultPos) {
+  var start = this.markPosition();
+  var expr = this.parseMaybeUnary(refShorthandDefaultPos);
+  if (refShorthandDefaultPos && refShorthandDefaultPos.start) return expr;
+  return this.parseExprOp(expr, start, -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, leftStart, minPrec, noIn) {
+  var prec = this.type.binop;
+  if (prec != null && (!noIn || this.type !== tt._in)) {
+    if (prec > minPrec) {
+      var node = this.startNodeAt(leftStart);
+      node.left = left;
+      node.operator = this.value;
+      var op = this.type;
+      this.next();
+      var start = this.markPosition();
+      node.right = this.parseExprOp(this.parseMaybeUnary(), start, op.rightAssociative ? prec - 1 : prec, noIn);
+      this.finishNode(node, op === tt.logicalOR || op === tt.logicalAND ? "LogicalExpression" : "BinaryExpression");
+      return this.parseExprOp(node, leftStart, minPrec, noIn);
+    }
+  }
+  return left;
+};
+
+// Parse unary operators, both prefix and postfix.
+
+pp.parseMaybeUnary = function (refShorthandDefaultPos) {
+  if (this.type.prefix) {
+    var node = this.startNode(),
+        update = this.type === tt.incDec;
+    node.operator = this.value;
+    node.prefix = true;
+    this.next();
+    node.argument = this.parseMaybeUnary();
+    if (refShorthandDefaultPos && refShorthandDefaultPos.start) this.unexpected(refShorthandDefaultPos.start);
+    if (update) this.checkLVal(node.argument);else if (this.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 start = this.markPosition();
+  var expr = this.parseExprSubscripts(refShorthandDefaultPos);
+  if (refShorthandDefaultPos && refShorthandDefaultPos.start) return expr;
+  while (this.type.postfix && !this.canInsertSemicolon()) {
+    var node = this.startNodeAt(start);
+    node.operator = this.value;
+    node.prefix = false;
+    node.argument = expr;
+    this.checkLVal(expr);
+    this.next();
+    expr = this.finishNode(node, "UpdateExpression");
+  }
+  return expr;
+};
+
+// Parse call, dot, and `[]`-subscript expressions.
+
+pp.parseExprSubscripts = function (refShorthandDefaultPos) {
+  var start = this.markPosition();
+  var expr = this.parseExprAtom(refShorthandDefaultPos);
+  if (refShorthandDefaultPos && refShorthandDefaultPos.start) return expr;
+  return this.parseSubscripts(expr, start);
+};
+
+pp.parseSubscripts = function (base, start, noCalls) {
+  if (this.eat(tt.dot)) {
+    var node = this.startNodeAt(start);
+    node.object = base;
+    node.property = this.parseIdent(true);
+    node.computed = false;
+    return this.parseSubscripts(this.finishNode(node, "MemberExpression"), start, noCalls);
+  } else if (this.eat(tt.bracketL)) {
+    var node = this.startNodeAt(start);
+    node.object = base;
+    node.property = this.parseExpression();
+    node.computed = true;
+    this.expect(tt.bracketR);
+    return this.parseSubscripts(this.finishNode(node, "MemberExpression"), start, noCalls);
+  } else if (!noCalls && this.eat(tt.parenL)) {
+    var node = this.startNodeAt(start);
+    node.callee = base;
+    node.arguments = this.parseExprList(tt.parenR, false);
+    return this.parseSubscripts(this.finishNode(node, "CallExpression"), start, noCalls);
+  } else if (this.type === tt.backQuote) {
+    var node = this.startNodeAt(start);
+    node.tag = base;
+    node.quasi = this.parseTemplate();
+    return this.parseSubscripts(this.finishNode(node, "TaggedTemplateExpression"), start, noCalls);
+  }return base;
+};
+
+// Parse an atomic expression — either a single token that is an
+// expression, an expression started by a keyword like `function` or
+// `new`, or an expression wrapped in punctuation like `()`, `[]`,
+// or `{}`.
+
+pp.parseExprAtom = function (refShorthandDefaultPos) {
+  var node = undefined;
+  switch (this.type) {
+    case tt._this:
+    case tt._super:
+      var type = this.type === tt._this ? "ThisExpression" : "Super";
+      node = this.startNode();
+      this.next();
+      return this.finishNode(node, type);
+
+    case tt._yield:
+      if (this.inGenerator) unexpected();
+
+    case tt.name:
+      var start = this.markPosition();
+      node = this.startNode();
+      var id = this.parseIdent(this.type !== tt.name);
+
+      //
+      if (this.options.features["es7.asyncFunctions"]) {
+        // async functions!
+        if (id.name === "async") {
+          // arrow functions
+          if (this.type === tt.parenL) {
+            var expr = this.parseParenAndDistinguishExpression(start, true);
+            if (expr.type === "ArrowFunctionExpression") {
+              return expr;
+            } else {
+              node.callee = id;
+              if (expr.type === "SequenceExpression") {
+                node.arguments = expr.expressions;
+              } else {
+                node.arguments = [expr];
+              }
+              return this.parseSubscripts(this.finishNode(node, "CallExpression"), start);
+            }
+          } else if (this.type === tt.name) {
+            id = this.parseIdent();
+            this.expect(tt.arrow);
+            return this.parseArrowExpression(node, [id], true);
+          }
+
+          // normal functions
+          if (this.type === tt._function && !this.canInsertSemicolon()) {
+            this.next();
+            return this.parseFunction(node, false, false, true);
+          }
+        } else if (id.name === "await") {
+          if (this.inAsync) return this.parseAwait(node);
+        }
+      }
+      //
+
+      if (!this.canInsertSemicolon() && this.eat(tt.arrow)) {
+        return this.parseArrowExpression(this.startNodeAt(start), [id]);
+      }
+      return id;
+
+    case tt.regexp:
+      var value = this.value;
+      node = this.parseLiteral(value.value);
+      node.regex = { pattern: value.pattern, flags: value.flags };
+      return node;
+
+    case tt.num:case tt.string:
+      return this.parseLiteral(this.value);
+
+    case tt._null:case tt._true:case tt._false:
+      node = this.startNode();
+      node.value = this.type === tt._null ? null : this.type === tt._true;
+      node.raw = this.type.keyword;
+      this.next();
+      return this.finishNode(node, "Literal");
+
+    case tt.parenL:
+      return this.parseParenAndDistinguishExpression();
+
+    case tt.bracketL:
+      node = this.startNode();
+      this.next();
+      // check whether this is array comprehension or regular array
+      if ((this.options.ecmaVersion >= 7 || this.options.features["es7.comprehensions"]) && this.type === tt._for) {
+        return this.parseComprehension(node, false);
+      }
+      node.elements = this.parseExprList(tt.bracketR, true, true, refShorthandDefaultPos);
+      return this.finishNode(node, "ArrayExpression");
+
+    case tt.braceL:
+      return this.parseObj(false, refShorthandDefaultPos);
+
+    case tt._function:
+      node = this.startNode();
+      this.next();
+      return this.parseFunction(node, false);
+
+    case tt._class:
+      return this.parseClass(this.startNode(), false);
+
+    case tt._new:
+      return this.parseNew();
+
+    case tt.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(tt.parenL);
+  var val = this.parseExpression();
+  this.expect(tt.parenR);
+  return val;
+};
+
+pp.parseParenAndDistinguishExpression = function (start, isAsync) {
+  start = start || this.markPosition();
+  var val = undefined;
+  if (this.options.ecmaVersion >= 6) {
+    this.next();
+
+    if ((this.options.features["es7.comprehensions"] || this.options.ecmaVersion >= 7) && this.type === tt._for) {
+      return this.parseComprehension(this.startNodeAt(start), true);
+    }
+
+    var innerStart = this.markPosition(),
+        exprList = [],
+        first = true;
+    var refShorthandDefaultPos = { start: 0 },
+        spreadStart = undefined,
+        innerParenStart = undefined;
+    while (this.type !== tt.parenR) {
+      first ? first = false : this.expect(tt.comma);
+      if (this.type === tt.ellipsis) {
+        var spreadNodeStart = this.markPosition();
+        spreadStart = this.start;
+        exprList.push(this.parseParenItem(this.parseRest(), spreadNodeStart));
+        break;
+      } else {
+        if (this.type === tt.parenL && !innerParenStart) {
+          innerParenStart = this.start;
+        }
+        exprList.push(this.parseMaybeAssign(false, refShorthandDefaultPos, this.parseParenItem));
+      }
+    }
+    var innerEnd = this.markPosition();
+    this.expect(tt.parenR);
+
+    if (!this.canInsertSemicolon() && this.eat(tt.arrow)) {
+      if (innerParenStart) this.unexpected(innerParenStart);
+      return this.parseParenArrowList(start, exprList, isAsync);
+    }
+
+    if (!exprList.length) this.unexpected(this.lastTokStart);
+    if (spreadStart) this.unexpected(spreadStart);
+    if (refShorthandDefaultPos.start) this.unexpected(refShorthandDefaultPos.start);
+
+    if (exprList.length > 1) {
+      val = this.startNodeAt(innerStart);
+      val.expressions = exprList;
+      this.finishNodeAt(val, "SequenceExpression", innerEnd);
+    } else {
+      val = exprList[0];
+    }
+  } else {
+    val = this.parseParenExpression();
+  }
+
+  if (this.options.preserveParens) {
+    var par = this.startNodeAt(start);
+    par.expression = val;
+    return this.finishNode(par, "ParenthesizedExpression");
+  } else {
+    return val;
+  }
+};
+
+pp.parseParenArrowList = function (start, exprList, isAsync) {
+  return this.parseArrowExpression(this.startNodeAt(start), exprList, isAsync);
+};
+
+pp.parseParenItem = function (node, start) {
+  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
+
+var empty = [];
+
+pp.parseNew = function () {
+  var node = this.startNode();
+  var meta = this.parseIdent(true);
+  if (this.options.ecmaVersion >= 6 && this.eat(tt.dot)) {
+    node.meta = meta;
+    node.property = this.parseIdent(true);
+    if (node.property.name !== "target") this.raise(node.property.start, "The only valid meta property for new is new.target");
+    return this.finishNode(node, "MetaProperty");
+  }
+  var start = this.markPosition();
+  node.callee = this.parseSubscripts(this.parseExprAtom(), start, true);
+  if (this.eat(tt.parenL)) node.arguments = this.parseExprList(tt.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),
+    cooked: this.value
+  };
+  this.next();
+  elem.tail = this.type === tt.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(tt.dollarBraceL);
+    node.expressions.push(this.parseExpression());
+    this.expect(tt.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 node = this.startNode(),
+      first = true,
+      propHash = {};
+  node.properties = [];
+  this.next();
+  while (!this.eat(tt.braceR)) {
+    if (!first) {
+      this.expect(tt.comma);
+      if (this.afterTrailingComma(tt.braceR)) break;
+    } else first = false;
+
+    var prop = this.startNode(),
+        isGenerator = false,
+        isAsync = false,
+        start = undefined;
+    if (this.options.features["es7.objectRestSpread"] && this.type === tt.ellipsis) {
+      prop = this.parseSpread();
+      prop.type = "SpreadProperty";
+      node.properties.push(prop);
+      continue;
+    }
+    if (this.options.ecmaVersion >= 6) {
+      prop.method = false;
+      prop.shorthand = false;
+      if (isPattern || refShorthandDefaultPos) start = this.markPosition();
+      if (!isPattern) isGenerator = this.eat(tt.star);
+    }
+    if (this.options.features["es7.asyncFunctions"] && this.isContextual("async")) {
+      if (isGenerator || isPattern) this.unexpected();
+      var asyncId = this.parseIdent();
+      if (this.type === tt.colon || this.type === tt.parenL) {
+        prop.key = asyncId;
+      } else {
+        isAsync = true;
+        this.parsePropertyName(prop);
+      }
+    } else {
+      this.parsePropertyName(prop);
+    }
+    this.parseObjPropValue(prop, start, isGenerator, isAsync, isPattern, refShorthandDefaultPos);
+    this.checkPropClash(prop, propHash);
+    node.properties.push(this.finishNode(prop, "Property"));
+  }
+  return this.finishNode(node, isPattern ? "ObjectPattern" : "ObjectExpression");
+};
+
+pp.parseObjPropValue = function (prop, start, isGenerator, isAsync, isPattern, refShorthandDefaultPos) {
+  if (this.eat(tt.colon)) {
+    prop.value = isPattern ? this.parseMaybeDefault() : this.parseMaybeAssign(false, refShorthandDefaultPos);
+    prop.kind = "init";
+  } else if (this.options.ecmaVersion >= 6 && this.type === tt.parenL) {
+    if (isPattern) this.unexpected();
+    prop.kind = "init";
+    prop.method = true;
+    prop.value = this.parseMethod(isGenerator, isAsync);
+  } else if (this.options.ecmaVersion >= 5 && !prop.computed && prop.key.type === "Identifier" && (prop.key.name === "get" || prop.key.name === "set") && (this.type != tt.comma && this.type != tt.braceR)) {
+    if (isGenerator || isAsync || isPattern) this.unexpected();
+    prop.kind = prop.key.name;
+    this.parsePropertyName(prop);
+    prop.value = this.parseMethod(false);
+  } else if (this.options.ecmaVersion >= 6 && !prop.computed && prop.key.type === "Identifier") {
+    prop.kind = "init";
+    if (isPattern) {
+      if (this.isKeyword(prop.key.name) || this.strict && (reservedWords.strictBind(prop.key.name) || reservedWords.strict(prop.key.name)) || !this.options.allowReserved && this.isReservedWord(prop.key.name)) this.raise(prop.key.start, "Binding " + prop.key.name);
+      prop.value = this.parseMaybeDefault(start, prop.key);
+    } else if (this.type === tt.eq && refShorthandDefaultPos) {
+      if (!refShorthandDefaultPos.start) refShorthandDefaultPos.start = this.start;
+      prop.value = this.parseMaybeDefault(start, 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(tt.bracketL)) {
+      prop.computed = true;
+      prop.key = this.parseMaybeAssign();
+      this.expect(tt.bracketR);
+      return;
+    } else {
+      prop.computed = false;
+    }
+  }
+  prop.key = this.type === tt.num || this.type === tt.string ? this.parseExprAtom() : this.parseIdent(true);
+};
+
+// Initialize empty function node.
+
+pp.initFunction = function (node, isAsync) {
+  node.id = null;
+  if (this.options.ecmaVersion >= 6) {
+    node.generator = false;
+    node.expression = false;
+  }
+  if (this.options.features["es7.asyncFunctions"]) {
+    node.async = !!isAsync;
+  }
+};
+
+// Parse object or class method.
+
+pp.parseMethod = function (isGenerator, isAsync) {
+  var node = this.startNode();
+  this.initFunction(node, isAsync);
+  this.expect(tt.parenL);
+  node.params = this.parseBindingList(tt.parenR, false, false);
+  var allowExpressionBody = undefined;
+  if (this.options.ecmaVersion >= 6) {
+    node.generator = isGenerator;
+    allowExpressionBody = true;
+  } else {
+    allowExpressionBody = false;
+  }
+  this.parseFunctionBody(node, allowExpressionBody);
+  return this.finishNode(node, "FunctionExpression");
+};
+
+// Parse arrow function expression with given parameters.
+
+pp.parseArrowExpression = function (node, params, isAsync) {
+  this.initFunction(node, isAsync);
+  node.params = this.toAssignableList(params, true);
+  this.parseFunctionBody(node, true);
+  return this.finishNode(node, "ArrowFunctionExpression");
+};
+
+// Parse function body and check parameters.
+
+pp.parseFunctionBody = function (node, allowExpression) {
+  var isExpression = allowExpression && this.type !== tt.braceL;
+
+  var oldInAsync = this.inAsync;
+  this.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.inFunction,
+        oldInGen = this.inGenerator,
+        oldLabels = this.labels;
+    this.inFunction = true;this.inGenerator = node.generator;this.labels = [];
+    node.body = this.parseBlock(true);
+    node.expression = false;
+    this.inFunction = oldInFunc;this.inGenerator = oldInGen;this.labels = oldLabels;
+  }
+  this.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`.
+  if (this.strict || !isExpression && node.body.body.length && this.isUseStrict(node.body.body[0])) {
+    var nameHash = {},
+        oldStrict = this.strict;
+    this.strict = true;
+    if (node.id) this.checkLVal(node.id, true);
+    for (var i = 0; i < node.params.length; i++) {
+      this.checkLVal(node.params[i], true, nameHash);
+    }this.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, allowTrailingComma, allowEmpty, refShorthandDefaultPos) {
+  var elts = [],
+      first = true;
+  while (!this.eat(close)) {
+    if (!first) {
+      this.expect(tt.comma);
+      if (allowTrailingComma && this.afterTrailingComma(close)) break;
+    } else first = false;
+
+    if (allowEmpty && this.type === tt.comma) {
+      elts.push(null);
+    } else {
+      if (this.type === tt.ellipsis) elts.push(this.parseSpread(refShorthandDefaultPos));else elts.push(this.parseMaybeAssign(false, refShorthandDefaultPos));
+    }
+  }
+  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 === tt.name) {
+    if (!liberal && (!this.options.allowReserved && this.isReservedWord(this.value) || this.strict && reservedWords.strict(this.value) && (this.options.ecmaVersion >= 6 || this.input.slice(this.start, this.end).indexOf("\\") == -1))) this.raise(this.start, "The keyword '" + this.value + "' is reserved");
+    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 await expression inside async function.
+
+pp.parseAwait = function (node) {
+  if (this.eat(tt.semi) || this.canInsertSemicolon()) {
+    this.unexpected();
+  }
+  node.all = this.eat(tt.star);
+  node.argument = this.parseMaybeAssign(true);
+  return this.finishNode(node, "AwaitExpression");
+};
+
+// Parses yield expression inside generator.
+
+pp.parseYield = function () {
+  var node = this.startNode();
+  this.next();
+  if (this.type == tt.semi || this.canInsertSemicolon() || this.type != tt.star && !this.type.startsExpr) {
+    node.delegate = false;
+    node.argument = null;
+  } else {
+    node.delegate = this.eat(tt.star);
+    node.argument = this.parseMaybeAssign();
+  }
+  return this.finishNode(node, "YieldExpression");
+};
+
+// Parses array and generator comprehensions.
+
+pp.parseComprehension = function (node, isGenerator) {
+  node.blocks = [];
+  while (this.type === tt._for) {
+    var block = this.startNode();
+    this.next();
+    this.expect(tt.parenL);
+    block.left = this.parseBindingAtom();
+    this.checkLVal(block.left, true);
+    this.expectContextual("of");
+    block.right = this.parseExpression();
+    this.expect(tt.parenR);
+    node.blocks.push(this.finishNode(block, "ComprehensionBlock"));
+  }
+  node.filter = this.eat(tt._if) ? this.parseParenExpression() : null;
+  node.body = this.parseExpression();
+  this.expect(isGenerator ? tt.parenR : tt.bracketR);
+  node.generator = isGenerator;
+  return this.finishNode(node, "ComprehensionExpression");
+};

lib/acorn/src/identifier.js

@@ -0,0 +1,143 @@
+
+
+// Test whether a given character code starts an identifier.
+
+"use strict";
+
+exports.isIdentifierStart = isIdentifierStart;
+
+// Test whether a given character is part of an identifier.
+
+exports.isIdentifierChar = isIdentifierChar;
+exports.__esModule = true;
+// This is a trick taken from Esprima. It turns out that, on
+// non-Chrome browsers, to check whether a string is in a set, a
+// predicate containing a big ugly `switch` statement is faster than
+// a regular expression, and on Chrome the two are about on par.
+// This function uses `eval` (non-lexical) to produce such a
+// predicate from a space-separated string of words.
+//
+// It starts by sorting the words by length.
+
+function makePredicate(words) {
+  words = words.split(" ");
+  var f = "",
+      cats = [];
+  out: for (var i = 0; i < words.length; ++i) {
+    for (var j = 0; j < cats.length; ++j) {
+      if (cats[j][0].length == words[i].length) {
+        cats[j].push(words[i]);
+        continue out;
+      }
+    }cats.push([words[i]]);
+  }
+  function compareTo(arr) {
+    if (arr.length == 1) return f += "return str === " + JSON.stringify(arr[0]) + ";";
+    f += "switch(str){";
+    for (var i = 0; i < arr.length; ++i) {
+      f += "case " + JSON.stringify(arr[i]) + ":";
+    }f += "return true}return false;";
+  }
+
+  // When there are more than three length categories, an outer
+  // switch first dispatches on the lengths, to save on comparisons.
+
+  if (cats.length > 3) {
+    cats.sort(function (a, b) {
+      return b.length - a.length;
+    });
+    f += "switch(str.length){";
+    for (var i = 0; i < cats.length; ++i) {
+      var cat = cats[i];
+      f += "case " + cat[0].length + ":";
+      compareTo(cat);
+    }
+    f += "}"
+
+    // Otherwise, simply generate a flat `switch` statement.
+
+    ;
+  } else {
+    compareTo(words);
+  }
+  return new Function("str", f);
+}
+
+// Reserved word lists for various dialects of the language
+
+var reservedWords = {
+  3: makePredicate("abstract boolean byte char class double enum export extends final float goto implements import int interface long native package private protected public short static super synchronized throws transient volatile"),
+  5: makePredicate("class enum extends super const export import"),
+  6: makePredicate("enum await"),
+  strict: makePredicate("implements interface let package private protected public static yield"),
+  strictBind: makePredicate("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: makePredicate(ecma5AndLessKeywords),
+  6: makePredicate(ecma5AndLessKeywords + " let const class extends export import yield 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 `tools/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-ࢲऄ-हऽॐक़-ॡॱ-ঀঅ-ঌএঐও-নপ-রলশ-হঽৎড়ঢ়য়-ৡৰৱਅ-ਊਏਐਓ-ਨਪ-ਰਲਲ਼ਵਸ਼ਸਹਖ਼-ੜਫ਼ੲ-ੴઅ-ઍએ-ઑઓ-નપ-રલળવ-હઽૐૠૡଅ-ଌଏଐଓ-ନପ-ରଲଳଵ-ହଽଡ଼ଢ଼ୟ-ୡୱஃஅ-ஊஎ-ஐஒ-கஙசஜஞடணதந-பம-ஹௐఅ-ఌఎ-ఐఒ-నప-హఽౘౙౠౡಅ-ಌಎ-ಐಒ-ನಪ-ಳವ-ಹಽೞೠೡೱೲഅ-ഌഎ-ഐഒ-ഺഽൎൠൡൺ-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-Ᏼᐁ-ᙬᙯ-ᙿᚁ-ᚚᚠ-ᛪᛮ-ᛸᜀ-ᜌᜎ-ᜑᜠ-ᜱᝀ-ᝑᝠ-ᝬᝮ-ᝰក-ឳៗៜᠠ-ᡷᢀ-ᢨᢪᢰ-ᣵᤀ-ᤞᥐ-ᥭᥰ-ᥴᦀ-ᦫᧁ-ᧇᨀ-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-鿌ꀀ-ꒌꓐ-ꓽꔀ-ꘌꘐ-ꘟꘪꘫꙀ-ꙮꙿ-ꚝꚠ-ꛯꜗ-ꜟꜢ-ꞈꞋ-ꞎꞐ-ꞭꞰꞱꟷ-ꠁꠃ-ꠅꠇ-ꠊꠌ-ꠢꡀ-ꡳꢂ-ꢳꣲ-ꣷꣻꤊ-ꤥꤰ-ꥆꥠ-ꥼꦄ-ꦲꧏꧠ-ꧤꧦ-ꧯꧺ-ꧾꨀ-ꨨꩀ-ꩂꩄ-ꩋꩠ-ꩶꩺꩾ-ꪯꪱꪵꪶꪹ-ꪽꫀꫂꫛ-ꫝꫠ-ꫪꫲ-ꫴꬁ-ꬆꬉ-ꬎꬑ-ꬖꬠ-ꬦꬨ-ꬮꬰ-ꭚꭜ-ꭟꭤꭥꯀ-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-ᤫᤰ-᤻᥆-᥏ᦰ-ᧀᧈᧉ᧐-᧚ᨗ-ᨛᩕ-ᩞ᩠-᩿᩼-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 tools/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, 98, 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, 955, 52, 76, 44, 33, 24, 27, 35, 42, 34, 4, 0, 13, 47, 15, 3, 22, 0, 38, 17, 2, 24, 133, 46, 39, 7, 3, 1, 3, 21, 2, 6, 2, 1, 2, 4, 4, 0, 32, 4, 287, 47, 21, 1, 2, 0, 185, 46, 82, 47, 21, 0, 60, 42, 502, 63, 32, 0, 449, 56, 1288, 920, 104, 110, 2962, 1070, 13266, 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, 16355, 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, 16, 9, 83, 11, 168, 11, 6, 9, 8, 2, 57, 0, 2, 6, 3, 1, 3, 2, 10, 0, 11, 1, 3, 6, 4, 4, 316, 19, 13, 9, 214, 6, 3, 8, 112, 16, 16, 9, 82, 12, 9, 9, 535, 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, 4305, 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 = 65536;
+  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;
+  }
+}
+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 <= 65535) return code >= 170 && nonASCIIidentifierStart.test(String.fromCharCode(code));
+  if (astral === false) return false;
+  return isInAstralSet(code, astralIdentifierStartCodes);
+}
+
+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 <= 65535) return code >= 170 && nonASCIIidentifier.test(String.fromCharCode(code));
+  if (astral === false) return false;
+  return isInAstralSet(code, astralIdentifierStartCodes) || isInAstralSet(code, astralIdentifierCodes);
+}

lib/acorn/src/index.js

@@ -0,0 +1,124 @@
+
+
+// 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
+
+"use strict";
+
+exports.parse = 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.
+
+exports.parseExpressionAt = parseExpressionAt;
+
+// Acorn is organized as a tokenizer and a recursive-descent parser.
+// The `tokenize` export provides an interface to the tokenizer.
+// Because the tokenizer is optimized for being efficiently used by
+// the Acorn parser itself, this interface is somewhat crude and not
+// very modular.
+
+exports.tokenizer = tokenizer;
+exports.__esModule = true;
+// 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/marijnh/acorn.git
+//
+// Please use the [github bug tracker][ghbt] to report issues.
+//
+// [ghbt]: https://github.com/marijnh/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
+
+var _state = require("./state");
+
+var Parser = _state.Parser;
+
+var _options = require("./options");
+
+var getOptions = _options.getOptions;
+
+require("./parseutil");
+
+require("./statement");
+
+require("./lval");
+
+require("./expression");
+
+require("./lookahead");
+
+exports.Parser = _state.Parser;
+exports.plugins = _state.plugins;
+exports.defaultOptions = _options.defaultOptions;
+
+var _location = require("./location");
+
+exports.SourceLocation = _location.SourceLocation;
+exports.getLineInfo = _location.getLineInfo;
+exports.Node = require("./node").Node;
+
+var _tokentype = require("./tokentype");
+
+exports.TokenType = _tokentype.TokenType;
+exports.tokTypes = _tokentype.types;
+
+var _tokencontext = require("./tokencontext");
+
+exports.TokContext = _tokencontext.TokContext;
+exports.tokContexts = _tokencontext.types;
+
+var _identifier = require("./identifier");
+
+exports.isIdentifierChar = _identifier.isIdentifierChar;
+exports.isIdentifierStart = _identifier.isIdentifierStart;
+exports.Token = require("./tokenize").Token;
+
+var _whitespace = require("./whitespace");
+
+exports.isNewLine = _whitespace.isNewLine;
+exports.lineBreak = _whitespace.lineBreak;
+exports.lineBreakG = _whitespace.lineBreakG;
+
+require("../plugins/flow");
+
+require("../plugins/jsx");
+
+var version = "1.0.0";exports.version = version;
+
+function parse(input, options) {
+  var p = parser(options, input);
+  var startPos = p.options.locations ? [p.pos, p.curPosition()] : p.pos;
+  p.nextToken();
+  return p.parseTopLevel(p.options.program || p.startNodeAt(startPos));
+}
+
+function parseExpressionAt(input, pos, options) {
+  var p = parser(options, input, pos);
+  p.nextToken();
+  return p.parseExpression();
+}
+
+function tokenizer(input, options) {
+  return parser(options, input);
+}
+
+function parser(options, input) {
+  return new Parser(getOptions(options), String(input));
+}

lib/acorn/src/location.js

@@ -0,0 +1,79 @@
+"use strict";
+
+var _classCallCheck = function (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } };
+
+// 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.getLineInfo = getLineInfo;
+exports.__esModule = true;
+
+var Parser = require("./state").Parser;
+
+var lineBreakG = require("./whitespace").lineBreakG;
+
+// These are used when `options.locations` is on, for the
+// `startLoc` and `endLoc` properties.
+
+var Position = exports.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;
+})();
+
+var SourceLocation = exports.SourceLocation = function SourceLocation(p, start, end) {
+  _classCallCheck(this, SourceLocation);
+
+  this.start = start;
+  this.end = end;
+  if (p.sourceFile !== null) this.source = p.sourceFile;
+};
+
+function getLineInfo(input, offset) {
+  for (var line = 1, cur = 0;;) {
+    lineBreakG.lastIndex = cur;
+    var match = lineBreakG.exec(input);
+    if (match && match.index < offset) {
+      ++line;
+      cur = match.index + match[0].length;
+    } else {
+      return new Position(line, offset - cur);
+    }
+  }
+}
+
+var pp = 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 = 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.curPosition = function () {
+  return new Position(this.curLine, this.pos - this.lineStart);
+};
+
+pp.markPosition = function () {
+  return this.options.locations ? [this.start, this.startLoc] : this.start;
+};

lib/acorn/src/lookahead.js

@@ -0,0 +1,24 @@
+"use strict";
+
+var Parser = require("./state").Parser;
+
+var pp = Parser.prototype;
+
+var STATE_KEYS = ["lastTokStartLoc", "lastTokEndLoc", "lastTokStart", "lastTokEnd", "lineStart", "startLoc", "endLoc", "start", "pos", "end", "type", "value"];
+
+pp.getState = function () {
+  var state = {};
+  for (var i = 0; i < STATE_KEYS.length; i++) {
+    var key = STATE_KEYS[i];
+    state[key] = this[key];
+  }
+  return state;
+};
+
+pp.lookahead = function () {
+  var old = this.getState();
+  this.next();
+  var curr = this.getState();
+  for (var key in old) this[key] = old[key];
+  return curr;
+};

lib/acorn/src/lval.js

@@ -0,0 +1,199 @@
+"use strict";
+
+var tt = require("./tokentype").types;
+
+var Parser = require("./state").Parser;
+
+var reservedWords = require("./identifier").reservedWords;
+
+var has = require("./util").has;
+
+var pp = 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":
+      case "AssignmentPattern":
+        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";
+        } else {
+          this.raise(node.left.end, "Only '=' operator can be used for specifying default value.");
+        }
+        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;
+    }
+  }
+  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 (refShorthandDefaultPos) {
+  var node = this.startNode();
+  this.next();
+  node.argument = this.parseMaybeAssign(refShorthandDefaultPos);
+  return this.finishNode(node, "SpreadElement");
+};
+
+pp.parseRest = function () {
+  var node = this.startNode();
+  this.next();
+  node.argument = this.type === tt.name || this.type === tt.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 tt.name:
+      return this.parseIdent();
+
+    case tt.bracketL:
+      var node = this.startNode();
+      this.next();
+      node.elements = this.parseBindingList(tt.bracketR, true, true);
+      return this.finishNode(node, "ArrayPattern");
+
+    case tt.braceL:
+      return this.parseObj(true);
+
+    default:
+      this.unexpected();
+  }
+};
+
+pp.parseBindingList = function (close, allowEmpty, allowTrailingComma) {
+  var elts = [],
+      first = true;
+  while (!this.eat(close)) {
+    if (first) first = false;else this.expect(tt.comma);
+    if (allowEmpty && this.type === tt.comma) {
+      elts.push(null);
+    } else if (allowTrailingComma && this.afterTrailingComma(close)) {
+      break;
+    } else if (this.type === tt.ellipsis) {
+      elts.push(this.parseAssignableListItemTypes(this.parseRest()));
+      this.expect(close);
+      break;
+    } else {
+      elts.push(this.parseAssignableListItemTypes(this.parseMaybeDefault()));
+    }
+  }
+  return elts;
+};
+
+pp.parseAssignableListItemTypes = function (param) {
+  return param;
+};
+
+// Parses assignment pattern around given atom if possible.
+
+pp.parseMaybeDefault = function (startPos, left) {
+  startPos = startPos || this.markPosition();
+  left = left || this.parseBindingAtom();
+  if (!this.eat(tt.eq)) return left;
+  var node = this.startNodeAt(startPos);
+  node.operator = "=";
+  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 && (reservedWords.strictBind(expr.name) || reservedWords.strict(expr.name))) this.raise(expr.start, (isBinding ? "Binding " : "Assigning to ") + expr.name + " in strict mode");
+      if (checkClashes) {
+        if (has(checkClashes, expr.name)) this.raise(expr.start, "Argument name clash in strict mode");
+        checkClashes[expr.name] = true;
+      }
+      break;
+
+    case "MemberExpression":
+      if (isBinding) this.raise(expr.start, (isBinding ? "Binding" : "Assigning to") + " member expression");
+      break;
+
+    case "ObjectPattern":
+      for (var i = 0; i < expr.properties.length; i++) {
+        var prop = expr.properties[i];
+        if (prop.type === "Property") prop = prop.value;
+        this.checkLVal(prop, 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 "SpreadProperty":
+    case "RestElement":
+      this.checkLVal(expr.argument, isBinding, checkClashes);
+      break;
+
+    default:
+      this.raise(expr.start, (isBinding ? "Binding" : "Assigning to") + " rvalue");
+  }
+};

lib/acorn/src/node.js

@@ -0,0 +1,61 @@
+"use strict";
+
+var _classCallCheck = function (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } };
+
+exports.__esModule = true;
+
+var Parser = require("./state").Parser;
+
+var SourceLocation = require("./location").SourceLocation;
+
+// Start an AST node, attaching a start offset.
+
+var pp = Parser.prototype;
+
+var Node = exports.Node = function Node() {
+  _classCallCheck(this, Node);
+};
+
+pp.startNode = function () {
+  var node = new Node();
+  node.start = this.start;
+  if (this.options.locations) node.loc = new SourceLocation(this, this.startLoc);
+  if (this.options.directSourceFile) node.sourceFile = this.options.directSourceFile;
+  if (this.options.ranges) node.range = [this.start, 0];
+  return node;
+};
+
+pp.startNodeAt = function (pos) {
+  var node = new Node(),
+      start = pos;
+  if (this.options.locations) {
+    node.loc = new SourceLocation(this, start[1]);
+    start = pos[0];
+  }
+  node.start = start;
+  if (this.options.directSourceFile) node.sourceFile = this.options.directSourceFile;
+  if (this.options.ranges) node.range = [start, 0];
+  return node;
+};
+
+// Finish an AST node, adding `type` and `end` properties.
+
+pp.finishNode = function (node, type) {
+  node.type = type;
+  node.end = this.lastTokEnd;
+  if (this.options.locations) node.loc.end = this.lastTokEndLoc;
+  if (this.options.ranges) node.range[1] = this.lastTokEnd;
+  return node;
+};
+
+// Finish node at given position
+
+pp.finishNodeAt = function (node, type, pos) {
+  if (this.options.locations) {
+    node.loc.end = pos[1];pos = pos[0];
+  }
+  node.type = type;
+  node.end = pos;
+  if (this.options.ranges) node.range[1] = pos;
+  return node;
+};

lib/acorn/src/options.js

@@ -0,0 +1,132 @@
+
+
+// Interpret and default an options object
+
+"use strict";
+
+exports.getOptions = getOptions;
+exports.__esModule = true;
+
+var _util = require("./util");
+
+var has = _util.has;
+var isArray = _util.isArray;
+
+var SourceLocation = require("./location").SourceLocation;
+
+// 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.
+  ecmaVersion: 5,
+  // 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 not enforced. Disable
+  // `allowReserved` to enforce them. When this option has the
+  // value "never", reserved words and keywords can also not be
+  // used as property names.
+  allowReserved: true,
+  // 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 tokenize() returns. Note that you are not
+  // allowed to call the parser from the callback—that will
+  // corrupt its internal state.
+  onToken: null,
+  // A function can be passed as `onComment` option, which will
+  // cause Acorn to call that function with `(block, text, start,
+  // end)` parameters whenever a comment is skipped. `block` is a
+  // boolean indicating whether this is a block (`/* */`) comment,
+  // `text` is the content of the comment, and `start` and `end` are
+  // character offsets that denote the start and end of the comment.
+  // When the `locations` option is on, two more parameters are
+  // passed, the full `{line, column}` locations of the start and
+  // end of the comments. Note that you are not allowed to call the
+  // parser from the callback—that will corrupt its internal state.
+  onComment: null,
+  // Nodes have their start and end characters offsets recorded in
+  // `start` and `end` properties (directly on the node, rather than
+  // the `loc` object, which holds line/column data. To also add a
+  // [semi-standardized][range] `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: {},
+  // Babel-specific options
+  features: {},
+  strictMode: null
+};exports.defaultOptions = defaultOptions;
+
+function getOptions(opts) {
+  var options = {};
+  for (var opt in defaultOptions) {
+    options[opt] = opts && has(opts, opt) ? opts[opt] : defaultOptions[opt];
+  }if (isArray(options.onToken)) {
+    (function () {
+      var tokens = options.onToken;
+      options.onToken = function (token) {
+        return tokens.push(token);
+      };
+    })();
+  }
+  if (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 SourceLocation(this, startLoc, endLoc);
+    if (options.ranges) comment.range = [start, end];
+    array.push(comment);
+  };
+}

lib/acorn/src/parseutil.js

@@ -0,0 +1,88 @@
+"use strict";
+
+var tt = require("./tokentype").types;
+
+var Parser = require("./state").Parser;
+
+var lineBreak = require("./whitespace").lineBreak;
+
+var pp = 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.value === "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 === tt.name && this.value === name;
+};
+
+// Consumes contextual keyword if possible.
+
+pp.eatContextual = function (name) {
+  return this.value === name && this.eat(tt.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 === tt.eof || this.type === tt.braceR || 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(tt.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");
+};

lib/acorn/src/state.js

@@ -0,0 +1,85 @@
+"use strict";
+
+exports.Parser = Parser;
+exports.__esModule = true;
+
+var _identifier = require("./identifier");
+
+var reservedWords = _identifier.reservedWords;
+var keywords = _identifier.keywords;
+
+var _tokentype = require("./tokentype");
+
+var tt = _tokentype.types;
+var lineBreak = _tokentype.lineBreak;
+
+function Parser(options, input, startPos) {
+  this.options = options;
+  this.loadPlugins(this.options.plugins);
+  this.sourceFile = this.options.sourceFile || null;
+  this.isKeyword = keywords[this.options.ecmaVersion >= 6 ? 6 : 5];
+  this.isReservedWord = reservedWords[this.options.ecmaVersion];
+  this.input = input;
+
+  // 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(lineBreak).length;
+  } else {
+    this.pos = this.lineStart = 0;
+    this.curLine = 1;
+  }
+
+  // Properties of the current token:
+  // Its type
+  this.type = tt.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 = null;
+
+  // 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.inModule = this.options.sourceType === "module";
+  this.strict = this.options.strictMode === false ? false : this.inModule;
+
+  // 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 && this.options.allowHashBang && this.input.slice(0, 2) === "#!") this.skipLineComment(2);
+}
+
+Parser.prototype.extend = function (name, f) {
+  this[name] = f(this[name]);
+};
+
+// Registered plugins
+
+var plugins = {};
+
+exports.plugins = plugins;
+Parser.prototype.loadPlugins = function (plugins) {
+  for (var _name in plugins) {
+    var plugin = exports.plugins[_name];
+    if (!plugin) throw new Error("Plugin '" + _name + "' not found");
+    plugin(this, plugins[_name]);
+  }
+};

lib/acorn/src/statement.js

@@ -0,0 +1,666 @@
+"use strict";
+
+var tt = require("./tokentype").types;
+
+var Parser = require("./state").Parser;
+
+var lineBreak = require("./whitespace").lineBreak;
+
+var pp = 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 !== tt.eof) {
+    var stmt = this.parseStatement(true, true);
+    node.body.push(stmt);
+    if (first && 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" };
+
+// 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();
+
+  // 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 tt._break:case tt._continue:
+      return this.parseBreakContinueStatement(node, starttype.keyword);
+    case tt._debugger:
+      return this.parseDebuggerStatement(node);
+    case tt._do:
+      return this.parseDoStatement(node);
+    case tt._for:
+      return this.parseForStatement(node);
+    case tt._function:
+      if (!declaration && this.options.ecmaVersion >= 6) this.unexpected();
+      return this.parseFunctionStatement(node);
+    case tt._class:
+      if (!declaration) this.unexpected();
+      return this.parseClass(node, true);
+    case tt._if:
+      return this.parseIfStatement(node);
+    case tt._return:
+      return this.parseReturnStatement(node);
+    case tt._switch:
+      return this.parseSwitchStatement(node);
+    case tt._throw:
+      return this.parseThrowStatement(node);
+    case tt._try:
+      return this.parseTryStatement(node);
+    case tt._let:case tt._const:
+      if (!declaration) this.unexpected(); // NOTE: falls through to _var
+    case tt._var:
+      return this.parseVarStatement(node, starttype);
+    case tt._while:
+      return this.parseWhileStatement(node);
+    case tt._with:
+      return this.parseWithStatement(node);
+    case tt.braceL:
+      return this.parseBlock();
+    case tt.semi:
+      return this.parseEmptyStatement(node);
+    case tt._export:
+    case tt._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 === tt._import ? this.parseImport(node) : this.parseExport(node);
+
+    case tt.name:
+      if (this.options.features["es7.asyncFunctions"] && this.value === "async") {
+        // check to see if `function ` appears after this token, this is
+        // pretty hacky
+        if (this.lookahead().type === tt._function) {
+          this.next();
+          this.expect(tt._function);
+          return this.parseFunction(node, true, false, true);
+        }
+      }
+
+    // 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 === tt.name && expr.type === "Identifier" && this.eat(tt.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(tt.semi) || this.insertSemicolon()) node.label = null;else if (this.type !== tt.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(tt._while);
+  node.test = this.parseParenExpression();
+  if (this.options.ecmaVersion >= 6) this.eat(tt.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(tt.parenL);
+  if (this.type === tt.semi) return this.parseFor(node, null);
+  if (this.type === tt._var || this.type === tt._let || this.type === tt._const) {
+    var _init = this.startNode(),
+        varKind = this.type;
+    this.next();
+    this.parseVar(_init, true, varKind);
+    this.finishNode(_init, "VariableDeclaration");
+    if ((this.type === tt._in || this.options.ecmaVersion >= 6 && this.isContextual("of")) && _init.declarations.length === 1 && !(varKind !== tt._var && _init.declarations[0].init)) return this.parseForIn(node, _init);
+    return this.parseFor(node, _init);
+  }
+  var refShorthandDefaultPos = { start: 0 };
+  var init = this.parseExpression(true, refShorthandDefaultPos);
+  if (this.type === tt._in || this.options.ecmaVersion >= 6 && this.isContextual("of")) {
+    this.toAssignable(init);
+    this.checkLVal(init);
+    return this.parseForIn(node, init);
+  } else if (refShorthandDefaultPos.start) {
+    this.unexpected(refShorthandDefaultPos.start);
+  }
+  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(tt._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(tt.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(tt.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; this.type != tt.braceR;) {
+    if (this.type === tt._case || this.type === tt._default) {
+      var isCase = this.type === tt._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.raise(this.lastTokStart, "Multiple default clauses");
+        sawDefault = true;
+        cur.test = null;
+      }
+      this.expect(tt.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 (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 === tt._catch) {
+    var clause = this.startNode();
+    this.next();
+    this.expect(tt.parenL);
+    clause.param = this.parseBindingAtom();
+    this.checkLVal(clause.param, true);
+    this.expect(tt.parenR);
+    clause.guard = null;
+    clause.body = this.parseBlock();
+    node.handler = this.finishNode(clause, "CatchClause");
+  }
+  node.guardedHandlers = empty;
+  node.finalizer = this.eat(tt._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 === tt._switch ? "switch" : null;
+  this.labels.push({ name: maybeName, kind: kind });
+  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(tt.braceL);
+  while (!this.eat(tt.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(tt.semi);
+  node.test = this.type === tt.semi ? null : this.parseExpression();
+  this.expect(tt.semi);
+  node.update = this.type === tt.parenR ? null : this.parseExpression();
+  this.expect(tt.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 === tt._in ? "ForInStatement" : "ForOfStatement";
+  this.next();
+  node.left = init;
+  node.right = this.parseExpression();
+  this.expect(tt.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.keyword;
+  for (;;) {
+    var decl = this.startNode();
+    this.parseVarHead(decl);
+    if (this.eat(tt.eq)) {
+      decl.init = this.parseMaybeAssign(isFor);
+    } else if (kind === tt._const && !(this.type === tt._in || this.options.ecmaVersion >= 6 && this.isContextual("of"))) {
+      this.unexpected();
+    } else if (decl.id.type != "Identifier" && !(isFor && (this.type === tt._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(tt.comma)) break;
+  }
+  return node;
+};
+
+pp.parseVarHead = 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, isAsync) {
+  this.initFunction(node, isAsync);
+  if (this.options.ecmaVersion >= 6) node.generator = this.eat(tt.star);
+  if (isStatement || this.type === tt.name) node.id = this.parseIdent();
+  this.parseFunctionParams(node);
+  this.parseFunctionBody(node, allowExpressionBody);
+  return this.finishNode(node, isStatement ? "FunctionDeclaration" : "FunctionExpression");
+};
+
+pp.parseFunctionParams = function (node) {
+  this.expect(tt.parenL);
+  node.params = this.parseBindingList(tt.parenR, false, false);
+};
+
+// Parse a class declaration or literal (depending on the
+// `isStatement` parameter).
+
+pp.parseClass = function (node, isStatement) {
+  this.next();
+  node.id = this.type === tt.name ? this.parseIdent() : isStatement ? this.unexpected() : null;
+  node.superClass = this.eat(tt._extends) ? this.parseExprSubscripts() : null;
+  var classBody = this.startNode();
+  classBody.body = [];
+  this.expect(tt.braceL);
+  while (!this.eat(tt.braceR)) {
+    if (this.eat(tt.semi)) continue;
+    var method = this.startNode();
+    var isGenerator = this.eat(tt.star);
+    this.parsePropertyName(method);
+    if (this.type !== tt.parenL && !method.computed && method.key.type === "Identifier" && method.key.name === "static") {
+      if (isGenerator) this.unexpected();
+      method["static"] = true;
+      isGenerator = this.eat(tt.star);
+      this.parsePropertyName(method);
+    } else {
+      method["static"] = false;
+    }
+    if (this.options.features["es7.asyncFunctions"] && this.type !== tt.parenL && !method.computed && method.key.type === "Identifier" && method.key.name === "async") {
+      isAsync = true;
+      this.parsePropertyName(method);
+    }
+    method.kind = "method";
+    if (!method.computed && !isGenerator) {
+      if (method.key.type === "Identifier") {
+        if (this.type !== tt.parenL && (method.key.name === "get" || method.key.name === "set")) {
+          method.kind = method.key.name;
+          this.parsePropertyName(method);
+        } else if (!method["static"] && method.key.name === "constructor") {
+          method.kind = "constructor";
+        }
+      } else if (!method["static"] && method.key.type === "Literal" && method.key.value === "constructor") {
+        method.kind = "constructor";
+      }
+    }
+    method.value = this.parseMethod(isGenerator);
+    classBody.body.push(this.finishNode(method, "MethodDefinition"));
+  }
+  node.body = this.finishNode(classBody, "ClassBody");
+  return this.finishNode(node, isStatement ? "ClassDeclaration" : "ClassExpression");
+};
+
+pp.parseClass = function (node, isStatement) {
+  this.next();
+  this.parseClassId(node, isStatement);
+  this.parseClassSuper(node);
+  var classBody = this.startNode();
+  classBody.body = [];
+  this.expect(tt.braceL);
+  while (!this.eat(tt.braceR)) {
+    if (this.eat(tt.semi)) continue;
+    var method = this.startNode();
+    var isGenerator = this.eat(tt.star),
+        isAsync = false;
+    this.parsePropertyName(method);
+    if (this.type !== tt.parenL && !method.computed && method.key.type === "Identifier" && method.key.name === "static") {
+      if (isGenerator) this.unexpected();
+      method["static"] = true;
+      isGenerator = this.eat(tt.star);
+      this.parsePropertyName(method);
+    } else {
+      method["static"] = false;
+    }
+    if (this.options.features["es7.asyncFunctions"] && this.type !== tt.parenL && !method.computed && method.key.type === "Identifier" && method.key.name === "async") {
+      isAsync = true;
+      this.parsePropertyName(method);
+    }
+    method.kind = "method";
+    if (!method.computed && !isGenerator) {
+      if (method.key.type === "Identifier") {
+        if (this.type !== tt.parenL && (method.key.name === "get" || method.key.name === "set")) {
+          method.kind = method.key.name;
+          this.parsePropertyName(method);
+        } else if (!method["static"] && method.key.name === "constructor") {
+          method.kind = "constructor";
+        }
+      } else if (!method["static"] && method.key.type === "Literal" && method.key.value === "constructor") {
+        method.kind = "constructor";
+      }
+    }
+    this.parseClassMethod(classBody, method, isGenerator, isAsync);
+  }
+  node.body = this.finishNode(classBody, "ClassBody");
+  return this.finishNode(node, isStatement ? "ClassDeclaration" : "ClassExpression");
+};
+
+pp.parseClassMethod = function (classBody, method, isGenerator, isAsync) {
+  method.value = this.parseMethod(isGenerator, isAsync);
+  classBody.body.push(this.finishNode(method, "MethodDefinition"));
+};
+
+pp.parseClassId = function (node, isStatement) {
+  node.id = this.type === tt.name ? this.parseIdent() : isStatement ? this.unexpected() : null;
+};
+
+pp.parseClassSuper = function (node) {
+  node.superClass = this.eat(tt._extends) ? this.parseExprSubscripts() : null;
+};
+
+// Parses module export declaration.
+
+pp.parseExport = function (node) {
+  this.next();
+  // export * from '...'
+  if (this.eat(tt.star)) {
+    this.expectContextual("from");
+    node.source = this.type === tt.string ? this.parseExprAtom() : this.unexpected();
+    this.semicolon();
+    return this.finishNode(node, "ExportAllDeclaration");
+  }
+  if (this.eat(tt._default)) {
+    // export default ...
+    var expr = this.parseMaybeAssign();
+    var needsSemi = false;
+    if (expr.id) switch (expr.type) {
+      case "FunctionExpression":
+        expr.type = "FunctionDeclaration";break;
+      case "ClassExpression":
+        expr.type = "ClassDeclaration";break;
+      default:
+        needsSemi = true;
+    }
+    node.declaration = expr;
+    if (needsSemi) this.semicolon();
+    return this.finishNode(node, "ExportDefaultDeclaration");
+  }
+  // export var|const|let|function|class ...
+  if (this.type.keyword || this.shouldParseExportDeclaration()) {
+    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 === tt.string ? this.parseExprAtom() : this.unexpected();
+    } else {
+      node.source = null;
+    }
+    this.semicolon();
+  }
+  return this.finishNode(node, "ExportNamedDeclaration");
+};
+
+pp.shouldParseExportDeclaration = function () {
+  return this.options.features["es7.asyncFunctions"] && this.isContextual("async");
+};
+
+// Parses a comma-separated list of module exports.
+
+pp.parseExportSpecifiers = function () {
+  var nodes = [],
+      first = true;
+  // export { x, y as z } [from '...']
+  this.expect(tt.braceL);
+  while (!this.eat(tt.braceR)) {
+    if (!first) {
+      this.expect(tt.comma);
+      if (this.afterTrailingComma(tt.braceR)) break;
+    } else first = false;
+
+    var node = this.startNode();
+    node.local = this.parseIdent(this.type === tt._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 === tt.string) {
+    node.specifiers = empty;
+    node.source = this.parseExprAtom();
+    node.kind = "";
+  } else {
+    node.specifiers = [];
+    this.parseImportSpecifiers(node);
+    this.expectContextual("from");
+    node.source = this.type === tt.string ? this.parseExprAtom() : this.unexpected();
+  }
+  this.semicolon();
+  return this.finishNode(node, "ImportDeclaration");
+};
+
+// Parses a comma-separated list of module imports.
+
+pp.parseImportSpecifiers = function (node) {
+  var first = true;
+  if (this.type === tt.name) {
+    // import defaultObj, { x, y as z } from '...'
+    var start = this.markPosition();
+    node.specifiers.push(this.parseImportSpecifierDefault(this.parseIdent(), start));
+    if (!this.eat(tt.comma)) return;
+  }
+  if (this.type === tt.star) {
+    var specifier = this.startNode();
+    this.next();
+    this.expectContextual("as");
+    specifier.local = this.parseIdent();
+    this.checkLVal(specifier.local, true);
+    node.specifiers.push(this.finishNode(specifier, "ImportNamespaceSpecifier"));
+    return;
+  }
+  this.expect(tt.braceL);
+  while (!this.eat(tt.braceR)) {
+    if (!first) {
+      this.expect(tt.comma);
+      if (this.afterTrailingComma(tt.braceR)) break;
+    } else first = false;
+
+    var specifier = this.startNode();
+    specifier.imported = this.parseIdent(true);
+    specifier.local = this.eatContextual("as") ? this.parseIdent() : specifier.imported;
+    this.checkLVal(specifier.local, true);
+    node.specifiers.push(this.finishNode(specifier, "ImportSpecifier"));
+  }
+};
+
+pp.parseImportSpecifierDefault = function (id, start) {
+  var node = this.startNodeAt(start);
+  node.local = id;
+  this.checkLVal(node.local, true);
+  return this.finishNode(node, "ImportDefaultSpecifier");
+};

lib/acorn/src/tokencontext.js

@@ -0,0 +1,101 @@
+"use strict";
+
+var _classCallCheck = function (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } };
+
+exports.__esModule = true;
+// 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
+
+var Parser = require("./state").Parser;
+
+var tt = require("./tokentype").types;
+
+var lineBreak = require("./whitespace").lineBreak;
+
+var TokContext = exports.TokContext = function TokContext(token, isExpr, preserveSpace, override) {
+  _classCallCheck(this, TokContext);
+
+  this.token = token;
+  this.isExpr = isExpr;
+  this.preserveSpace = preserveSpace;
+  this.override = override;
+};
+
+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 = Parser.prototype;
+
+pp.initialContext = function () {
+  return [types.b_stat];
+};
+
+pp.braceIsBlock = function (prevType) {
+  var parent = undefined;
+  if (prevType === tt.colon && (parent = this.curContext()).token == "{") return !parent.isExpr;
+  if (prevType === tt._return) return lineBreak.test(this.input.slice(this.lastTokEnd, this.start));
+  if (prevType === tt._else || prevType === tt.semi || prevType === tt.eof) return true;
+  if (prevType == tt.braceL) return this.curContext() === types.b_stat;
+  return !this.exprAllowed;
+};
+
+pp.updateContext = function (prevType) {
+  var update = undefined,
+      type = this.type;
+  if (type.keyword && prevType == tt.dot) this.exprAllowed = false;else if (update = type.updateContext) update.call(this, prevType);else this.exprAllowed = type.beforeExpr;
+};
+
+// Token-specific context update code
+
+tt.parenR.updateContext = tt.braceR.updateContext = function () {
+  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 && out.isExpr);
+  }
+};
+
+tt.braceL.updateContext = function (prevType) {
+  this.context.push(this.braceIsBlock(prevType) ? types.b_stat : types.b_expr);
+  this.exprAllowed = true;
+};
+
+tt.dollarBraceL.updateContext = function () {
+  this.context.push(types.b_tmpl);
+  this.exprAllowed = true;
+};
+
+tt.parenL.updateContext = function (prevType) {
+  var statementParens = prevType === tt._if || prevType === tt._for || prevType === tt._with || prevType === tt._while;
+  this.context.push(statementParens ? types.p_stat : types.p_expr);
+  this.exprAllowed = true;
+};
+
+tt.incDec.updateContext = function () {};
+
+tt._function.updateContext = function () {
+  if (this.curContext() !== types.b_stat) this.context.push(types.f_expr);
+  this.exprAllowed = false;
+};
+
+tt.backQuote.updateContext = function () {
+  if (this.curContext() === types.q_tmpl) this.context.pop();else this.context.push(types.q_tmpl);
+  this.exprAllowed = false;
+};
+
+// tokExprAllowed stays unchanged

lib/acorn/src/tokenize.js

@@ -0,0 +1,753 @@
+"use strict";
+
+var _classCallCheck = function (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } };
+
+exports.__esModule = true;
+
+var _identifier = require("./identifier");
+
+var isIdentifierStart = _identifier.isIdentifierStart;
+var isIdentifierChar = _identifier.isIdentifierChar;
+
+var _tokentype = require("./tokentype");
+
+var tt = _tokentype.types;
+var keywordTypes = _tokentype.keywords;
+
+var Parser = require("./state").Parser;
+
+var SourceLocation = require("./location").SourceLocation;
+
+var _whitespace = require("./whitespace");
+
+var lineBreak = _whitespace.lineBreak;
+var lineBreakG = _whitespace.lineBreakG;
+var isNewLine = _whitespace.isNewLine;
+var nonASCIIwhitespace = _whitespace.nonASCIIwhitespace;
+
+// 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 = exports.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 SourceLocation(p, p.startLoc, p.endLoc);
+  if (p.options.ranges) this.range = [p.start, p.end];
+};
+
+// ## Tokenizer
+
+var pp = Parser.prototype;
+
+// 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 === tt.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 !== tt.num && this.type !== tt.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(tt.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 (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 <= 55295 || code >= 57344) return code;
+  var next = this.input.charCodeAt(this.pos + 1);
+  return (code << 10) + next - 56613888;
+};
+
+pp.skipBlockComment = function () {
+  var startLoc = this.options.onComment && this.options.locations && 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) {
+    lineBreakG.lastIndex = start;
+    var match = undefined;
+    while ((match = 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.options.locations && this.curPosition());
+};
+
+pp.skipLineComment = function (startSkip) {
+  var start = this.pos;
+  var startLoc = this.options.onComment && this.options.locations && 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.options.locations && this.curPosition());
+};
+
+// Called at the start of the parse and after every token. Skips
+// whitespace and comments, and.
+
+pp.skipSpace = function () {
+  while (this.pos < this.input.length) {
+    var ch = this.input.charCodeAt(this.pos);
+    if (ch === 32) {
+      // ' '
+      ++this.pos;
+    } else if (ch === 13) {
+      ++this.pos;
+      var next = this.input.charCodeAt(this.pos);
+      if (next === 10) {
+        ++this.pos;
+      }
+      if (this.options.locations) {
+        ++this.curLine;
+        this.lineStart = this.pos;
+      }
+    } else if (ch === 10 || ch === 8232 || ch === 8233) {
+      ++this.pos;
+      if (this.options.locations) {
+        ++this.curLine;
+        this.lineStart = this.pos;
+      }
+    } else if (ch > 8 && ch < 14) {
+      ++this.pos;
+    } else if (ch === 47) {
+      // '/'
+      var next = this.input.charCodeAt(this.pos + 1);
+      if (next === 42) {
+        // '*'
+        this.skipBlockComment();
+      } else if (next === 47) {
+        // '/'
+        this.skipLineComment(2);
+      } else break;
+    } else if (ch === 160) {
+      // '\xa0'
+      ++this.pos;
+    } else if (ch >= 5760 && nonASCIIwhitespace.test(String.fromCharCode(ch))) {
+      ++this.pos;
+    } else {
+      break;
+    }
+  }
+};
+
+// 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(tt.ellipsis);
+  } else {
+    ++this.pos;
+    return this.finishToken(tt.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(tt.assign, 2);
+  return this.finishOp(tt.slash, 1);
+};
+
+pp.readToken_mult_modulo = function (code) {
+  // '%*'
+  var type = code === 42 ? tt.star : tt.modulo;
+  var width = 1;
+  var next = this.input.charCodeAt(this.pos + 1);
+
+  if (next === 42) {
+    // '*'
+    width++;
+    next = this.input.charCodeAt(this.pos + 2);
+    type = tt.exponent;
+  }
+
+  if (next === 61) {
+    width++;
+    type = tt.assign;
+  }
+
+  return this.finishOp(type, width);
+};
+
+pp.readToken_pipe_amp = function (code) {
+  // '|&'
+  var next = this.input.charCodeAt(this.pos + 1);
+  if (next === code) return this.finishOp(code === 124 ? tt.logicalOR : tt.logicalAND, 2);
+  if (next === 61) return this.finishOp(tt.assign, 2);
+  return this.finishOp(code === 124 ? tt.bitwiseOR : tt.bitwiseAND, 1);
+};
+
+pp.readToken_caret = function () {
+  // '^'
+  var next = this.input.charCodeAt(this.pos + 1);
+  if (next === 61) return this.finishOp(tt.assign, 2);
+  return this.finishOp(tt.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 && lineBreak.test(this.input.slice(this.lastTokEnd, this.pos))) {
+      // A `-->` line comment
+      this.skipLineComment(3);
+      this.skipSpace();
+      return this.nextToken();
+    }
+    return this.finishOp(tt.incDec, 2);
+  }
+  if (next === 61) return this.finishOp(tt.assign, 2);
+  return this.finishOp(tt.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(tt.assign, size + 1);
+    return this.finishOp(tt.bitShift, size);
+  }
+  if (next == 33 && code == 60 && this.input.charCodeAt(this.pos + 2) == 45 && this.input.charCodeAt(this.pos + 3) == 45) {
+    if (this.inModule) 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 = this.input.charCodeAt(this.pos + 2) === 61 ? 3 : 2;
+  return this.finishOp(tt.relational, size);
+};
+
+pp.readToken_eq_excl = function (code) {
+  // '=!'
+  var next = this.input.charCodeAt(this.pos + 1);
+  if (next === 61) return this.finishOp(tt.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(tt.arrow);
+  }
+  return this.finishOp(code === 61 ? tt.eq : tt.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(tt.parenL);
+    case 41:
+      ++this.pos;return this.finishToken(tt.parenR);
+    case 59:
+      ++this.pos;return this.finishToken(tt.semi);
+    case 44:
+      ++this.pos;return this.finishToken(tt.comma);
+    case 91:
+      ++this.pos;return this.finishToken(tt.bracketL);
+    case 93:
+      ++this.pos;return this.finishToken(tt.bracketR);
+    case 123:
+      ++this.pos;return this.finishToken(tt.braceL);
+    case 125:
+      ++this.pos;return this.finishToken(tt.braceR);
+    case 58:
+      ++this.pos;return this.finishToken(tt.colon);
+    case 63:
+      ++this.pos;return this.finishToken(tt.question);
+
+    case 96:
+      // '`'
+      if (this.options.ecmaVersion < 6) break;
+      ++this.pos;
+      return this.finishToken(tt.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(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(tt.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);
+};
+
+var regexpUnicodeSupport = false;
+try {
+  new RegExp("￿", "u");regexpUnicodeSupport = true;
+} catch (e) {}
+
+// Parse a regular expression. Some context-awareness is necessary,
+// since a '/' inside a '[]' set does not end the expression.
+
+pp.readRegexp = function () {
+  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 (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;
+  if (mods) {
+    var validFlags = /^[gmsiy]*$/;
+    if (this.options.ecmaVersion >= 6) validFlags = /^[gmsiyu]*$/;
+    if (!validFlags.test(mods)) this.raise(start, "Invalid regular expression flag");
+    if (mods.indexOf("u") >= 0 && !regexpUnicodeSupport) {
+      // 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([a-fA-F0-9]{4})|\\u\{([0-9a-fA-F]+)\}|[\uD800-\uDBFF][\uDC00-\uDFFF]/g, "x");
+    }
+  }
+  // Detect invalid regular expressions.
+  try {
+    new RegExp(tmp);
+  } catch (e) {
+    if (e instanceof SyntaxError) this.raise(start, "Error parsing regular expression: " + e.message);
+    this.raise(e);
+  }
+  // Get a regular expression object for this pattern-flag pair, or `null` in
+  // case the current environment doesn't support the flags it uses.
+  var value = undefined;
+  try {
+    value = new RegExp(content, mods);
+  } catch (err) {
+    value = null;
+  }
+  return this.finishToken(tt.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 (isIdentifierStart(this.fullCharCodeAtPos())) this.raise(this.pos, "Identifier directly after number");
+  return this.finishToken(tt.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");
+  if (this.input.charCodeAt(this.pos) === 46) {
+    ++this.pos;
+    this.readInt(10);
+    isFloat = true;
+  }
+  var 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 (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(tt.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();
+    ++this.pos;
+    code = this.readHexChar(this.input.indexOf("}", this.pos) - this.pos);
+    ++this.pos;
+    if (code > 1114111) this.unexpected();
+  } else {
+    code = this.readHexChar(4);
+  }
+  return code;
+};
+
+function codePointToString(code) {
+  // UTF-16 Decoding
+  if (code <= 65535) return String.fromCharCode(code);
+  return String.fromCharCode((code - 65536 >> 10) + 55296, (code - 65536 & 1023) + 56320);
+}
+
+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();
+      chunkStart = this.pos;
+    } else {
+      if (isNewLine(ch)) this.raise(this.start, "Unterminated string constant");
+      ++this.pos;
+    }
+  }
+  out += this.input.slice(chunkStart, this.pos++);
+  return this.finishToken(tt.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 === tt.template) {
+        if (ch === 36) {
+          this.pos += 2;
+          return this.finishToken(tt.dollarBraceL);
+        } else {
+          ++this.pos;
+          return this.finishToken(tt.backQuote);
+        }
+      }
+      out += this.input.slice(chunkStart, this.pos);
+      return this.finishToken(tt.template, out);
+    }
+    if (ch === 92) {
+      // '\'
+      out += this.input.slice(chunkStart, this.pos);
+      out += this.readEscapedChar();
+      chunkStart = this.pos;
+    } else if (isNewLine(ch)) {
+      out += this.input.slice(chunkStart, this.pos);
+      ++this.pos;
+      if (ch === 13 && this.input.charCodeAt(this.pos) === 10) {
+        ++this.pos;
+        out += "\n";
+      } else {
+        out += String.fromCharCode(ch);
+      }
+      if (this.options.locations) {
+        ++this.curLine;
+        this.lineStart = this.pos;
+      }
+      chunkStart = this.pos;
+    } else {
+      ++this.pos;
+    }
+  }
+};
+
+// Used to read escaped characters
+
+pp.readEscapedChar = function () {
+  var ch = this.input.charCodeAt(++this.pos);
+  var octal = /^[0-7]+/.exec(this.input.slice(this.pos, this.pos + 3));
+  if (octal) octal = octal[0];
+  while (octal && parseInt(octal, 8) > 255) octal = octal.slice(0, -1);
+  if (octal === "0") octal = null;
+  ++this.pos;
+  if (octal) {
+    if (this.strict) this.raise(this.pos - 2, "Octal literal in strict mode");
+    this.pos += octal.length - 1;
+    return String.fromCharCode(parseInt(octal, 8));
+  } else {
+    switch (ch) {
+      case 110:
+        return "\n"; // 'n' -> '\n'
+      case 114:
+        return "\r"; // 'r' -> '\r'
+      case 120:
+        return String.fromCharCode(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 48:
+        return "\u0000"; // 0 -> '\0'
+      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:
+        return String.fromCharCode(ch);
+    }
+  }
+};
+
+// Used to read character escape sequences ('\x', '\u', '\U').
+
+pp.readHexChar = function (len) {
+  var n = this.readInt(16, len);
+  if (n === null) this.raise(this.start, "Bad character escape sequence");
+  return n;
+};
+
+// Used to signal to callers of `readWord1` whether the word
+// contained any escape sequences. This is needed because words with
+// escape sequences must not be interpreted as keywords.
+
+var containsEsc;
+
+// Read an identifier, and return it as a string. Sets `containsEsc`
+// to whether the word contained a '\u' escape.
+//
+// Incrementally adds only escaped chars, adding other chunks as-is
+// as a micro-optimization.
+
+pp.readWord1 = function () {
+  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 (isIdentifierChar(ch, astral)) {
+      this.pos += ch <= 65535 ? 1 : 2;
+    } else if (ch === 92) {
+      // "\"
+      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 ? isIdentifierStart : 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 = tt.name;
+  if ((this.options.ecmaVersion >= 6 || !containsEsc) && this.isKeyword(word)) type = keywordTypes[word];
+  return this.finishToken(type, word);
+};

lib/acorn/src/tokentype.js

@@ -0,0 +1,156 @@
+"use strict";
+
+var _classCallCheck = function (instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } };
+
+exports.__esModule = true;
+// ## 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).
+//
+// `isLoop` marks a keyword as starting a loop, which is important
+// to know when parsing a label, in order to allow or disallow
+// continue jumps to that label.
+
+var TokenType = exports.TokenType = function TokenType(label) {
+  var conf = arguments[1] === undefined ? {} : arguments[1];
+
+  _classCallCheck(this, TokenType);
+
+  this.label = label;
+  this.keyword = conf.keyword;
+  this.beforeExpr = !!conf.beforeExpr;
+  this.startsExpr = !!conf.startsExpr;
+  this.rightAssociative = !!conf.rightAssociative;
+  this.isLoop = !!conf.isLoop;
+  this.isAssign = !!conf.isAssign;
+  this.prefix = !!conf.prefix;
+  this.postfix = !!conf.postfix;
+  this.binop = conf.binop || null;
+  this.updateContext = null;
+};
+
+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),
+  exponent: new TokenType("**", { beforeExpr: true, binop: 11, rightAssociative: 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[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");
+kw("do", { isLoop: true });
+kw("else", beforeExpr);
+kw("finally");
+kw("for", { isLoop: true });
+kw("function");
+kw("if");
+kw("return", beforeExpr);
+kw("switch");
+kw("throw", beforeExpr);
+kw("try");
+kw("var");
+kw("let");
+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("yield", { beforeExpr: true, startsExpr: true });
+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 });

lib/acorn/src/util.js

@@ -0,0 +1,16 @@
+"use strict";
+
+exports.isArray = isArray;
+
+// Checks if an object has a property.
+
+exports.has = has;
+exports.__esModule = true;
+
+function isArray(obj) {
+  return Object.prototype.toString.call(obj) === "[object Array]";
+}
+
+function has(obj, propName) {
+  return Object.prototype.hasOwnProperty.call(obj, propName);
+}

lib/acorn/src/whitespace.js

@@ -0,0 +1,19 @@
+"use strict";
+
+exports.isNewLine = isNewLine;
+exports.__esModule = true;
+// Matches a whole line break (where CRLF is considered a single
+// line break). Used to count lines.
+
+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 === 8232 || code == 8233;
+}
+
+var nonASCIIwhitespace = /[\u1680\u180e\u2000-\u200a\u202f\u205f\u3000\ufeff]/;
+exports.nonASCIIwhitespace = nonASCIIwhitespace;

lib/acorn/test/.subl38b.tmp

@@ -0,0 +1,112 @@
+(function() {
+  var driver, acorn;
+
+  if (typeof require !== "undefined") {
+    driver = require("./driver.js");
+    require("./tests.js");
+    require("./tests-harmony.js");
+    require("babel/register")
+    acorn = require("../src")
+  } else {
+    driver = window;
+    acorn = window.acorn;
+  }
+
+  var htmlLog = typeof document === "object" && document.getElementById('log');
+  var htmlGroup = htmlLog;
+
+  function group(name) {
+    if (htmlGroup) {
+      var parentGroup = htmlGroup;
+      htmlGroup = document.createElement("ul");
+      var item = document.createElement("li");
+      item.textContent = name;
+      item.appendChild(htmlGroup);
+      parentGroup.appendChild(item);
+    }
+    if (typeof console === "object" && console.group) {
+      console.group(name);
+    }
+  }
+
+  function groupEnd() {
+    if (htmlGroup) {
+      htmlGroup = htmlGroup.parentElement.parentElement;
+    }
+    if (typeof console === "object" && console.groupEnd) {
+      console.groupEnd(name);
+    }
+  }
+
+  function log(title, message) {
+    if (htmlGroup) {
+      var elem = document.createElement("li");
+      elem.innerHTML = "<b>" + title + "</b> " + message;
+      htmlGroup.appendChild(elem);
+    }
+    if (typeof console === "object") console.log(title, message);
+  }
+
+  var stats, modes = {
+    Normal: {
+      config: {
+        parse: acorn.parse
+      }
+    },
+    Loose: {
+      config: {
+        parse: acorn.parse_dammit,
+        loose: true,
+        filter: function (test) {
+          var opts = test.options || {};
+          if (opts.loose === false) return false;
+          return (opts.ecmaVersion || 5) <= 6;
+        }
+      }
+    }
+  };
+
+  function report(state, code, message) {
+    if (state != "ok") {++stats.failed; log(code, message);}
+    ++stats.testsRun;
+  }
+
+  group("Errors");
+
+  for (var name in modes) {
+    group(name);
+    var mode = modes[name];
+    stats = mode.stats = {testsRun: 0, failed: 0};
+    var t0 = +new Date;
+    driver.runTests(mode.config, report);
+    mode.stats.duration = +new Date - t0;
+    groupEnd();
+  }
+
+  groupEnd();
+
+  function outputStats(name, stats) {
+    log(name + ":", stats.testsRun + " tests run in " + stats.duration + "ms; " +
+      (stats.failed ? stats.failed + " failures." : "all passed."));
+  }
+
+  var total = {testsRun: 0, failed: 0, duration: 0};
+
+  group("Stats");
+
+  for (var name in modes) {
+    var stats = modes[name].stats;
+    outputStats(name + " parser", stats);
+    for (var key in stats) total[key] += stats[key];
+  }
+
+  outputStats("Total", total);
+
+  groupEnd();
+
+  if (total.failed && typeof process === "object") {
+    process.stdout.write("", function() {
+      process.exit(1);
+    });
+  }
+})();

lib/acorn/test/bench.html

@@ -0,0 +1,96 @@
+<!doctype html>
+<head>
+  <meta charset="utf-8">
+  <title>Acorn benchmark</title>
+  <script src="../acorn.js"></script>
+  <script src="compare/esprima.js"></script>
+  <script src="compare/traceur.js"></script>
+  <script src="jquery-string.js"></script>
+  <script src="codemirror-string.js"></script>
+  <style>
+    td { text-align: right; padding-right: 20px; }
+    th { text-align: left; padding-right: 40px; }
+    body { max-width: 50em; padding: 1em 2em; }
+    h1 { font-size: 150%; }
+  </style>
+</head>
+
+<h1>Acorn/Esprima/Traceur speed comparison</h1>
+
+<p>This will run each of the three ES6 parsers on the source code of
+jQuery 1.11.1 and CodeMirror 3.0b1 for five seconds, and show a table
+indicating the number of lines parsed per second. Note that Traceur
+always stores location data, and is thus not fairly compared by the
+benchmark <em>without</em> location data.<p>
+
+<p>Also note that having the developer tools open in Chrome, or
+Firebug in Firefox <em>heavily</em> influences the numbers you get. In
+Chrome, the effect even lingers (in the tab) after you close the
+developer tools. Load in a fresh tab to get (halfway) stable
+numbers.</p>
+
+<button onclick="run(false)">Compare <strong>without</strong> location data</button>
+<button onclick="run(true)">Compare <strong>with</strong> location data</button>
+<button onclick="run(false, true)">Run only Acorn</button>
+<span id="running"></span>
+
+<script>
+  var sourceFileName = 'source.js';
+
+  function runAcorn(code, locations) {
+    acorn.parse(code, {ecmaVersion: 6, locations: locations, sourceFile: sourceFileName});
+  }
+  function runEsprima(code, locations) {
+    esprima.parse(code, {loc: locations, source: sourceFileName});
+  }
+  function runTraceur(code) {
+    var file = new traceur.syntax.SourceFile(sourceFileName, code);
+    var parser = new traceur.syntax.Parser(file);
+    parser.parseScript();
+  }
+
+  var totalLines = codemirror30.split("\n").length + jquery111.split("\n").length;
+
+  var nowHost = (typeof performance === 'object' && 'now' in performance) ? performance : Date;
+
+  function benchmark(runner, locations) {
+    // Give it a chance to warm up (first runs are usually outliers)
+    runner(jquery111, locations);
+    runner(codemirror30, locations);
+    var t0 = nowHost.now(), t1, lines = 0;
+    for (;;) {
+      runner(jquery111, locations);
+      runner(codemirror30, locations);
+      lines += totalLines;
+      t1 = nowHost.now();
+      if (t1 - t0 > 5000) break;
+    }
+    return lines / ((t1 - t0) / 1000);
+  }
+
+  function showOutput(values) {
+    var html = "<hr><table>";
+    for (var i = 0; i < values.length; ++i)
+      html += "<tr><th>" + values[i].name + "</td><td>" + Math.round(values[i].score) + " lines per second</td><td>" +
+                        Math.round(values[i].score * 100 / values[0].score) + "%</td></tr>";
+    document.body.appendChild(document.createElement("div")).innerHTML = html;
+  }
+
+  function run(locations, acornOnly) {
+    var running = document.getElementById("running");
+    running.innerHTML = "Running benchmark...";
+    var data = [{name: "Acorn", runner: runAcorn},
+                {name: "Esprima", runner: runEsprima},
+                {name: "Traceur", runner: runTraceur}];
+    if (acornOnly) data.length = 1;
+    var pos = 0;
+    function next() {
+      data[pos].score = benchmark(data[pos].runner, locations);
+      if (++pos == data.length) {
+        running.innerHTML = "";
+        showOutput(data);
+      } else setTimeout(next, 100);
+    }
+    setTimeout(next, 50);
+  }
+</script>

lib/acorn/test/driver.js

@@ -0,0 +1,114 @@
+"use strict";
+
+(function (exports) {
+  var tests = [];
+
+  exports.test = function (code, ast, options) {
+    tests.push({ code: code, ast: ast, options: options });
+  };
+  exports.testFail = function (code, message, options) {
+    tests.push({ code: code, error: message, options: options });
+  };
+  exports.testAssert = function (code, assert, options) {
+    tests.push({ code: code, assert: assert, options: options });
+  };
+
+  exports.runTests = function (config, callback) {
+    var parse = config.parse;
+
+    for (var i = 0; i < tests.length; ++i) {
+      var test = tests[i];
+      if (config.filter && !config.filter(test)) continue;
+      var testOpts = test.options || { locations: true };
+      var expected = {};
+      if (expected.onComment = testOpts.onComment) testOpts.onComment = [];
+      if (expected.onToken = testOpts.onToken) testOpts.onToken = [];
+
+      try {
+        var ast = parse(test.code, testOpts);
+      } catch (e) {
+        if (!(e instanceof SyntaxError)) {
+          console.log(e.stack);throw e;
+        }
+        if (test.error) {
+          if (e.message == test.error) callback("ok", test.code);else callback("fail", test.code, "Expected error message: " + test.error + "\nGot error message: " + e.message);
+        } else {
+          callback("error", test.code, e.message || e.toString());
+        }
+        continue;
+      }
+
+      if (test.error) {
+        if (config.loose) callback("ok", test.code);else callback("fail", test.code, "Expected error message: " + test.error + "\nBut parsing succeeded.");
+      } else if (test.assert) {
+        var error = test.assert(ast);
+        if (error) callback("fail", test.code, "\n  Assertion failed:\n " + error);else callback("ok", test.code);
+      } else {
+        var mis = misMatch(test.ast, ast);
+        for (var name in expected) {
+          if (mis) break;
+          if (expected[name]) {
+            mis = misMatch(expected[name], testOpts[name]);
+            testOpts[name] = expected[name];
+          }
+        }
+        if (mis) callback("fail", test.code, mis);else callback("ok", test.code);
+      }
+    }
+  };
+
+  function ppJSON(v) {
+    return v instanceof RegExp ? v.toString() : JSON.stringify(v, null, 2);
+  }
+  function addPath(str, pt) {
+    if (str.charAt(str.length - 1) == ")") return str.slice(0, str.length - 1) + "/" + pt + ")";
+    return str + " (" + pt + ")";
+  }
+
+  var misMatch = exports.misMatch = function (exp, act) {
+    if (!exp || !act || typeof exp != "object" || typeof act != "object") {
+      if (exp !== act && typeof exp != "function") return ppJSON(exp) + " !== " + ppJSON(act);
+    } else if (exp instanceof RegExp || act instanceof RegExp) {
+      var left = ppJSON(exp),
+          right = ppJSON(act);
+      if (left !== right) return left + " !== " + right;
+    } else if (exp.splice) {
+      if (!act.slice) return ppJSON(exp) + " != " + ppJSON(act);
+      if (act.length != exp.length) return "array length mismatch " + exp.length + " != " + act.length;
+      for (var i = 0; i < act.length; ++i) {
+        var mis = misMatch(exp[i], act[i]);
+        if (mis) return addPath(mis, i);
+      }
+    } else {
+      for (var prop in exp) {
+        var mis = misMatch(exp[prop], act[prop]);
+        if (mis) return addPath(mis, prop);
+      }
+    }
+  };
+
+  function mangle(ast) {
+    if (typeof ast != "object" || !ast) return;
+    if (ast.slice) {
+      for (var i = 0; i < ast.length; ++i) mangle(ast[i]);
+    } else {
+      var loc = ast.start && ast.end && { start: ast.start, end: ast.end };
+      if (loc) {
+        delete ast.start;delete ast.end;
+      }
+      for (var name in ast) if (ast.hasOwnProperty(name)) mangle(ast[name]);
+      if (loc) ast.loc = loc;
+    }
+  }
+
+  exports.printTests = function () {
+    var out = "";
+    for (var i = 0; i < tests.length; ++i) {
+      if (tests[i].error) continue;
+      mangle(tests[i].ast);
+      out += "test(" + JSON.stringify(tests[i].code) + ", " + JSON.stringify(tests[i].ast, null, 2) + ");\n\n";
+    }
+    document.body.innerHTML = "";
+    document.body.appendChild(document.createElement("pre")).appendChild(document.createTextNode(out));
+  };
+})(typeof exports == "undefined" ? window : exports);

lib/acorn/test/index.html

@@ -0,0 +1,14 @@
+<!doctype html>
+<head>
+  <meta charset="utf-8">
+  <title>Acorn test suite</title>
+  <script src="../dist/acorn.js"></script>
+  <script src="../dist/acorn_loose.js"></script>
+  <script src="driver.js"></script>
+  <script src="tests.js" charset="utf-8"></script>
+  <script src="tests-harmony.js" charset="utf-8"></script>
+</head>
+<body>
+  <ul id="log"></ul>
+  <script src="run.js"></script>
+</body>

lib/acorn/test/run.js

@@ -0,0 +1,108 @@
+"use strict";
+
+(function () {
+  var driver, acorn;
+
+  if (typeof require !== "undefined") {
+    driver = require("./driver.js");
+    require("./tests.js");
+    require("./tests-harmony.js");
+    require("./tests-flow.js");
+    require("./tests-jsx.js");
+    require("./tests-babel.js");
+    require("babel/register");
+    acorn = require("../src");
+  } else {
+    driver = window;
+    acorn = window.acorn;
+  }
+
+  var htmlLog = typeof document === "object" && document.getElementById("log");
+  var htmlGroup = htmlLog;
+
+  function group(name) {
+    if (htmlGroup) {
+      var parentGroup = htmlGroup;
+      htmlGroup = document.createElement("ul");
+      var item = document.createElement("li");
+      item.textContent = name;
+      item.appendChild(htmlGroup);
+      parentGroup.appendChild(item);
+    }
+    if (typeof console === "object" && console.group) {
+      console.group(name);
+    }
+  }
+
+  function groupEnd() {
+    if (htmlGroup) {
+      htmlGroup = htmlGroup.parentElement.parentElement;
+    }
+    if (typeof console === "object" && console.groupEnd) {
+      console.groupEnd(name);
+    }
+  }
+
+  function log(title, message) {
+    if (htmlGroup) {
+      var elem = document.createElement("li");
+      elem.innerHTML = "<b>" + title + "</b> " + message;
+      htmlGroup.appendChild(elem);
+    }
+    if (typeof console === "object") console.log(title, message);
+  }
+
+  var stats,
+      modes = {
+    Normal: {
+      config: {
+        parse: acorn.parse
+      }
+    }
+  };
+
+  function report(state, code, message) {
+    if (state != "ok") {
+      ++stats.failed;log(code, message);
+    }
+    ++stats.testsRun;
+  }
+
+  group("Errors");
+
+  for (var name in modes) {
+    group(name);
+    var mode = modes[name];
+    stats = mode.stats = { testsRun: 0, failed: 0 };
+    var t0 = +new Date();
+    driver.runTests(mode.config, report);
+    mode.stats.duration = +new Date() - t0;
+    groupEnd();
+  }
+
+  groupEnd();
+
+  function outputStats(name, stats) {
+    log(name + ":", stats.testsRun + " tests run in " + stats.duration + "ms; " + (stats.failed ? stats.failed + " failures." : "all passed."));
+  }
+
+  var total = { testsRun: 0, failed: 0, duration: 0 };
+
+  group("Stats");
+
+  for (var name in modes) {
+    var stats = modes[name].stats;
+    outputStats(name + " parser", stats);
+    for (var key in stats) total[key] += stats[key];
+  }
+
+  outputStats("Total", total);
+
+  groupEnd();
+
+  if (total.failed && typeof process === "object") {
+    process.stdout.write("", function () {
+      process.exit(1);
+    });
+  }
+})();