93 lines
2.1 KiB
JavaScript
93 lines
2.1 KiB
JavaScript
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'use strict';
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var through = require('through2'),
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uglify = require('uglify-js'),
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merge = require('deepmerge'),
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PluginError = require('gulp-util/lib/PluginError'),
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applySourceMap = require('vinyl-sourcemaps-apply'),
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reSourceMapComment = /\n\/\/# sourceMappingURL=.+?$/,
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pluginName = 'gulp-uglify';
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function minify(file, options) {
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var mangled;
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try {
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mangled = uglify.minify(String(file.contents), options);
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mangled.code = new Buffer(mangled.code.replace(reSourceMapComment, ''));
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return mangled;
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} catch (e) {
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return createError(file, e);
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}
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}
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function setup(opts) {
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var options = merge(opts || {}, {
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fromString: true,
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output: {}
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});
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if (options.preserveComments === 'all') {
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options.output.comments = true;
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} else if (options.preserveComments === 'some') {
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// preserve comments with directives or that start with a bang (!)
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options.output.comments = /^!|@preserve|@license|@cc_on/i;
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} else if (typeof options.preserveComments === 'function') {
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options.output.comments = options.preserveComments;
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}
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return options;
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}
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function createError(file, err) {
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if (typeof err === 'string') {
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return new PluginError(pluginName, file.path + ': ' + err, {
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fileName: file.path,
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showStack: false
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});
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}
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var msg = err.message || err.msg || /* istanbul ignore next */ 'unspecified error';
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return new PluginError(pluginName, file.path + ': ' + msg, {
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fileName: file.path,
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lineNumber: err.line,
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stack: err.stack,
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showStack: false
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});
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}
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module.exports = function(opt) {
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function uglify(file, encoding, callback) {
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var options = setup(opt);
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if (file.isNull()) {
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return callback(null, file);
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}
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if (file.isStream()) {
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return callback(createError(file, 'Streaming not supported'));
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}
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if (file.sourceMap) {
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options.outSourceMap = file.relative;
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options.inSourceMap = file.sourceMap.mappings !== '' ? file.sourceMap : undefined;
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}
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var mangled = minify(file, options);
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if (mangled instanceof PluginError) {
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return callback(mangled);
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}
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file.contents = mangled.code;
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if (file.sourceMap) {
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applySourceMap(file, mangled.map);
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}
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callback(null, file);
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}
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return through.obj(uglify);
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};
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