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/**
* Copyright 2013-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
'use strict';
/*eslint-disable no-undef*/
var assign = require('object-assign');
var visitors = require('../visitors');
var jstransform = require('./jstransform');
var typesSyntax = require('../visitors/type-syntax');
var inlineSourceMap = require('./inline-source-map');
var fs = require('fs');
var DEFAULT_OPTIONS = {
react: false,
es6: false,
es7: false,
harmony: false,
utility: false,
target: 'es5',
stripTypes: false,
sourceMap: false,
sourceMapInline: false,
sourceFilename: 'source.js',
es6module: false,
nonStrictEs6module: false
};
/**
* Transforms the given code with the given options.
*
* @param {string} code
* @param {object} options
* @return {object}
*/
function transform(code, options) {
options = assign({}, DEFAULT_OPTIONS, options);
// Process options
var transformOptions = {};
if (options.sourceMap || options.sourceMapInline) {
transformOptions.sourceMap = true;
transformOptions.filename = options.sourceFilename || 'source.js';
}
if (options.es6module) {
transformOptions.sourceType = 'module';
}
if (options.nonStrictEs6module) {
transformOptions.sourceType = 'nonStrictModule';
}
// Instead of doing any fancy validation, only look for 'es3'. If we have
// that, then use it. Otherwise use 'es5'.
transformOptions.es3 = options.target === 'es3';
transformOptions.es5 = !transformOptions.es3;
// Determine visitors to use
var visitorSets = [];
if (options.react) {
visitorSets.push('react');
}
if (options.harmony) {
visitorSets.push('harmony');
}
if (options.es6) {
visitorSets.push('es6');
}
if (options.es7) {
visitorSets.push('es7');
}
if (options.utility) {
visitorSets.push('utility');
}
if (options.target === 'es3') {
visitorSets.push('target:es3');
}
if (options.stripTypes) {
// Stripping types needs to happen before the other transforms
// unfortunately, due to bad interactions. For example,
// es6-rest-param-visitors conflict with stripping rest param type
// annotation
code = jstransform.transform(
typesSyntax.visitorList,
code,
transformOptions
).code;
}
var visitorList = visitors.getVisitorsBySet(visitorSets);
var result = jstransform.transform(visitorList, code, transformOptions);
// Only copy some things off.
var output = {
code: result.code,
sourceMap: null
};
// Convert sourceMap to JSON.
var sourceMap;
if (result.sourceMap) {
sourceMap = result.sourceMap.toJSON();
sourceMap.sources = [transformOptions.filename];
sourceMap.sourcesContent = [code];
}
// This differentiates options.sourceMap from options.sourceMapInline.
if (options.sourceMap) {
output.sourceMap = sourceMap;
}
if (options.sourceMapInline) {
var map = inlineSourceMap(
result.sourceMap,
code,
transformOptions.filename
);
output.code = output.code + '\n' + map;
}
return output;
}
function transformFile(file, options, callback) {
if (typeof options === 'function') {
callback = options;
options = {};
}
options = assign({sourceFilename: file}, options);
fs.readFile(file, 'utf-8', function(err, contents) {
if (err) {
return callback(err, null);
}
var result = transform(contents, options);
callback(null, result);
});
}
function transformFileSync(file, options) {
options = assign({sourceFilename: file}, options);
var contents = fs.readFileSync(file, 'utf-8');
return transform(contents, options);
}
module.exports = {
transform: transform,
transformFile: transformFile,
transformFileSync: transformFileSync
};
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