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/**
* @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");
// 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 });
}
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() {
var name, types = {};
if (typeof Object.create === "function") {
types = Object.create(null);
}
for (name in astNodeTypes) {
if (astNodeTypes.hasOwnProperty(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;
}());
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