1 | 'use strict';
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2 | var through = require('through2'),
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3 | uglify = require('uglify-js'),
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4 | merge = require('deepmerge'),
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5 | PluginError = require('gulp-util/lib/PluginError'),
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6 | applySourceMap = require('vinyl-sourcemaps-apply'),
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7 | reSourceMapComment = /\n\/\/# sourceMappingURL=.+?$/,
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8 | pluginName = 'gulp-uglify';
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9 |
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10 | function minify(file, options) {
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11 | var mangled;
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12 |
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13 | try {
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14 | mangled = uglify.minify(String(file.contents), options);
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15 | mangled.code = new Buffer(mangled.code.replace(reSourceMapComment, ''));
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16 | return mangled;
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17 | } catch (e) {
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18 | return createError(file, e);
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19 | }
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20 | }
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21 |
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22 | function setup(opts) {
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23 | var options = merge(opts || {}, {
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24 | fromString: true,
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25 | output: {}
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26 | });
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27 |
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28 | if (options.preserveComments === 'all') {
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29 | options.output.comments = true;
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30 | } else if (options.preserveComments === 'some') {
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31 |
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32 | options.output.comments = /^!|@preserve|@license|@cc_on/i;
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33 | } else if (typeof options.preserveComments === 'function') {
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34 | options.output.comments = options.preserveComments;
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35 | }
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36 |
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37 | return options;
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38 | }
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39 |
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40 | function createError(file, err) {
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41 | if (typeof err === 'string') {
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42 | return new PluginError(pluginName, file.path + ': ' + err, {
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43 | fileName: file.path,
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44 | showStack: false
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45 | });
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46 | }
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47 |
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48 | var msg = err.message || err.msg || 'unspecified error';
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49 |
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50 | return new PluginError(pluginName, file.path + ': ' + msg, {
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51 | fileName: file.path,
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52 | lineNumber: err.line,
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53 | stack: err.stack,
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54 | showStack: false
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55 | });
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56 | }
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57 |
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58 | module.exports = function(opt) {
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59 |
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60 | function uglify(file, encoding, callback) {
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61 | var options = setup(opt);
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62 |
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63 | if (file.isNull()) {
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64 | return callback(null, file);
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65 | }
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66 |
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67 | if (file.isStream()) {
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68 | return callback(createError(file, 'Streaming not supported'));
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69 | }
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70 |
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71 | if (file.sourceMap) {
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72 | options.outSourceMap = file.relative;
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73 | options.inSourceMap = file.sourceMap.mappings !== '' ? file.sourceMap : undefined;
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74 | }
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75 |
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76 | var mangled = minify(file, options);
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77 |
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78 | if (mangled instanceof PluginError) {
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79 | return callback(mangled);
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80 | }
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81 |
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82 | file.contents = mangled.code;
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83 |
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84 | if (file.sourceMap) {
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85 | applySourceMap(file, mangled.map);
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86 | }
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87 |
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88 | callback(null, file);
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89 | }
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90 |
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91 | return through.obj(uglify);
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92 | };
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