b38dea0597
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
78 lines
2.7 KiB
JavaScript
Executable file
78 lines
2.7 KiB
JavaScript
Executable file
'use strict';
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/**
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* Handles running a JS minifier over a directory, only picking out the .js
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* files for minification, or allowing a minification of a specfic file in
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* place. By default, uses an AST-backed minifier, in astMinify, but the file
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* methods allow passing in a function that handles the actual minification.
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*/
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var utils = require('./utils');
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var esprima = require('esprima');
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var escodegen = require('escodegen');
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var jsSuffix = /\.js$/;
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/**
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* Minifies all .js files found in the given directory path string. Can pass
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* a custom minifyFn that does the minification. If no minifyFn is passed, then
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* the default of astMinify will be used.
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*/
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exports.minifyDir = function(dirPath, minifyFn) {
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utils.listFiles(dirPath, utils.FILE_TYPE_FILE, true)
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.forEach(function(filePath) {
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if (jsSuffix.test(filePath)) {
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exports.minifyFile(filePath, minifyFn);
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}
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});
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};
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/**
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* Minifies the file at the given filePath string. If it has a problem minifying
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* the file, it will just skip it. Can pass a custom minifyFn that does the
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* minification. If no minifyFn is passed, then the default of astMinify with
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* its default options will be used. To use jsmin:
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*
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* minifyFile(filePath, function(contents) {
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* return require('jsmin')(contents).code;
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* });
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*/
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exports.minifyFile = function(filePath, minifyFn) {
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minifyFn = minifyFn || exports.astMinify;
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try {
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var file = utils.getFile(filePath);
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var contents = utils.getFileContent(file);
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utils.writeContent(file, minifyFn(contents));
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} catch(e) {
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utils.log('esomin', 'Unable to minify, skipping ' + filePath);
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}
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};
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/*
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* Does some minification, via an AST. Allows some es6 features to be used, like
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* arrow functions and template strings. Currently uglify cannot handle them.
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*
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* Long term want to use Reflect.parse to get a speed boost, but there are some
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* incompatibilities with its AST and the escodegen/esmangle tools, tracked in
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* bug 913617.
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*
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* Also, this module only does comment removal right now. That is the biggest
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* minification win, but over time want to use esmangle, see esmangle notes
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* below.
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*
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* More research details here:
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* https://github.com/jrburke/esomin
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*/
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exports.astMinify = function(contents, options) {
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var ast = esprima.parse(contents);
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// Long term TODO, use esmangle, https://github.com/Constellation/esmangle
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// to do name mangling. Unfortunately it is not able to handle the es6-ish
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// AST yet.
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// There are some options fo escodegen, like removing line returns, but
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// not using them to preserve line returns to give better debugging
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// experience. Options are here:
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// https://github.com/Constellation/escodegen/wiki/API
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return escodegen.generate(ast, options);
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};
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