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uglify.js
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uglify.js
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/*
* grunt-contrib-uglify
* https://gruntjs.com/
*
* Copyright (c) 2014 "Cowboy" Ben Alman, contributors
* Licensed under the MIT license.
*/
'use strict';
// External libs.
var path = require('path');
var fs = require('fs');
var UglifyJS = require('uglify-js');
var _ = require('lodash');
exports.init = function(grunt) {
var exports = {};
// Minify with UglifyJS.
// From https://github.com/mishoo/UglifyJS2
// API docs at http://lisperator.net/uglifyjs/
exports.minify = function(files, dest, options) {
options = options || {};
grunt.verbose.write('Minifying with UglifyJS...');
var topLevel = null;
var totalCode = '';
var sourcesContent = {};
var outputOptions = getOutputOptions(options, dest);
var output = UglifyJS.OutputStream(outputOptions);
// Grab and parse all source files
files.forEach(function(file){
var code = grunt.file.read(file);
totalCode += code;
// The src file name must be relative to the source map for things to work
var basename = path.basename(file);
var fileDir = path.dirname(file);
var sourceMapDir = path.dirname(options.generatedSourceMapName);
var relativePath = path.relative(sourceMapDir, fileDir);
var pathPrefix = relativePath ? (relativePath+path.sep) : '';
// Convert paths to use forward slashes for sourcemap use in the browser
file = (pathPrefix + basename).replace(/\\/g, '/');
sourcesContent[file] = code;
topLevel = UglifyJS.parse(code, {
filename: file,
toplevel: topLevel,
expression: options.expression
});
});
// Wrap code in a common js wrapper.
if (options.wrap) {
topLevel = topLevel.wrap_commonjs(options.wrap, options.exportAll);
}
// Wrap code in closure with configurable arguments/parameters list.
if (options.enclose) {
var argParamList = _.map(options.enclose, function(val, key) {
return key + ':' + val;
});
topLevel = topLevel.wrap_enclose(argParamList);
}
// Need to call this before we mangle or compress,
// and call after any compression or ast altering
if (options.expression === false) {
topLevel.figure_out_scope();
}
if (options.compress !== false) {
if (options.compress.warnings !== true) {
options.compress.warnings = false;
}
var compressor = UglifyJS.Compressor(options.compress);
topLevel = topLevel.transform(compressor);
// Need to figure out scope again after source being altered
topLevel.figure_out_scope();
}
if (options.mangle !== false) {
// disabled due to:
// 1) preserve stable name mangling
// 2) it increases gzipped file size, see https://github.com/mishoo/UglifyJS2#mangler-options
// // compute_char_frequency optimizes names for compression
// topLevel.compute_char_frequency(options.mangle);
// Requires previous call to figure_out_scope
// and should always be called after compressor transform
topLevel.mangle_names(options.mangle);
}
if (options.sourceMap && options.sourceMapIncludeSources) {
for (var file in sourcesContent) {
if (sourcesContent.hasOwnProperty(file)) {
outputOptions.source_map.get().setSourceContent(file, sourcesContent[file]);
}
}
}
// Print the ast to OutputStream
topLevel.print(output);
var min = output.get();
// Add the source map reference to the end of the file
if (options.sourceMap) {
// Set all paths to forward slashes for use in the browser
min += "\n//# sourceMappingURL="+options.destToSourceMap.replace(/\\/g, '/');
}
var result = {
max: totalCode,
min: min,
sourceMap: outputOptions.source_map
};
grunt.verbose.ok();
return result;
};
var getOutputOptions = function(options, dest) {
var outputOptions = {
beautify: false,
source_map: null
};
if (options.preserveComments) {
if (options.preserveComments === 'all' || options.preserveComments === true) {
// preserve all the comments we can
outputOptions.comments = true;
} else if (options.preserveComments === 'some') {
// preserve comments with directives or that start with a bang (!)
outputOptions.comments = /^!|@preserve|@license|@cc_on/i;
} else if (_.isFunction(options.preserveComments)) {
// support custom functions passed in
outputOptions.comments = options.preserveComments;
}
}
if (options.banner && options.sourceMap) {
outputOptions.preamble = options.banner;
}
if (options.beautify) {
if (_.isObject(options.beautify)) {
// beautify options sent as an object are merged
// with outputOptions and passed to the OutputStream
_.assign(outputOptions, options.beautify);
} else {
outputOptions.beautify = true;
}
}
if (options.sourceMap) {
var destBasename = path.basename(dest);
var destPath = path.dirname(dest);
var sourceMapIn;
if (options.sourceMapIn) {
sourceMapIn = grunt.file.readJSON(options.sourceMapIn);
}
outputOptions.source_map = UglifyJS.SourceMap({
file: destBasename,
orig: sourceMapIn
});
}
if (options.indentLevel !== undefined) {
outputOptions.indent_level = options.indentLevel;
}
return outputOptions;
};
return exports;
};