Edit File: espree.js
/** * @fileoverview Main Espree file that converts Acorn into Esprima output. * * This file contains code from the following MIT-licensed projects: * 1. Acorn * 2. Babylon * 3. Babel-ESLint * * This file also contains code from Esprima, which is BSD licensed. * * Acorn is Copyright 2012-2015 Acorn Contributors (https://github.com/marijnh/acorn/blob/master/AUTHORS) * Babylon is Copyright 2014-2015 various contributors (https://github.com/babel/babel/blob/master/packages/babylon/AUTHORS) * Babel-ESLint is Copyright 2014-2015 Sebastian McKenzie <sebmck@gmail.com> * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * Esprima is Copyright (c) jQuery Foundation, Inc. and Contributors, All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* eslint no-undefined:0, no-use-before-define: 0 */ "use strict"; const acorn = require("acorn"); const jsx = require("acorn-jsx"); const astNodeTypes = require("./lib/ast-node-types"); const espree = require("./lib/espree"); const { getLatestEcmaVersion, getSupportedEcmaVersions } = require("./lib/options"); // To initialize lazily. const parsers = { _regular: null, _jsx: null, get regular() { if (this._regular === null) { this._regular = acorn.Parser.extend(espree()); } return this._regular; }, get jsx() { if (this._jsx === null) { this._jsx = acorn.Parser.extend(jsx(), espree()); } return this._jsx; }, get(options) { const useJsx = Boolean( options && options.ecmaFeatures && options.ecmaFeatures.jsx ); return useJsx ? this.jsx : this.regular; } }; //------------------------------------------------------------------------------ // Tokenizer //------------------------------------------------------------------------------ /** * Tokenizes the given code. * @param {string} code The code to tokenize. * @param {Object} options Options defining how to tokenize. * @returns {Token[]} An array of tokens. * @throws {SyntaxError} If the input code is invalid. * @private */ function tokenize(code, options) { const Parser = parsers.get(options); // Ensure to collect tokens. if (!options || options.tokens !== true) { options = Object.assign({}, options, { tokens: true }); // eslint-disable-line no-param-reassign } return new Parser(options, code).tokenize(); } //------------------------------------------------------------------------------ // Parser //------------------------------------------------------------------------------ /** * Parses the given code. * @param {string} code The code to tokenize. * @param {Object} options Options defining how to tokenize. * @returns {ASTNode} The "Program" AST node. * @throws {SyntaxError} If the input code is invalid. */ function parse(code, options) { const Parser = parsers.get(options); return new Parser(options, code).parse(); } //------------------------------------------------------------------------------ // Public //------------------------------------------------------------------------------ exports.version = require("./package.json").version; exports.tokenize = tokenize; exports.parse = parse; // Deep copy. /* istanbul ignore next */ exports.Syntax = (function() { let name, types = {}; if (typeof Object.create === "function") { types = Object.create(null); } for (name in astNodeTypes) { if (Object.hasOwnProperty.call(astNodeTypes, name)) { types[name] = astNodeTypes[name]; } } if (typeof Object.freeze === "function") { Object.freeze(types); } return types; }()); /* istanbul ignore next */ exports.VisitorKeys = (function() { return require("eslint-visitor-keys").KEYS; }()); exports.latestEcmaVersion = getLatestEcmaVersion(); exports.supportedEcmaVersions = getSupportedEcmaVersions();
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