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