mirror of
https://github.com/whoisclebs/lodash.git
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103 lines
3.5 KiB
JavaScript
103 lines
3.5 KiB
JavaScript
#!/usr/bin/env node
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;(function() {
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'use strict';
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/** The Node.js filesystem module */
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var fs = require('fs');
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/** The minimal license/copyright template */
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var licenseTemplate = [
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'/**',
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' * @license',
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' * Lo-Dash <%= VERSION %> lodash.com/license',
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' * Underscore.js 1.4.4 underscorejs.org/LICENSE',
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' */'
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].join('\n');
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/*--------------------------------------------------------------------------*/
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/**
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* Post-process a given minified Lo-Dash `source`, preparing it for
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* deployment.
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*
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* @param {String} source The source to process.
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* @returns {String} Returns the processed source.
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*/
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function postprocess(source) {
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// remove copyright header
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source = source.replace(/^\/\**[\s\S]+?\*\/\n/, '');
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// correct overly aggressive Closure Compiler advanced optimization
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source = source
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.replace(/(document[^&]+&&)\s*(?:\w+|!\d)/, '$1!({toString:0}+"")')
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.replace(/"\t"/g, '"\\t"')
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.replace(/"[^"]*?\\f[^"]*?"/g,
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'" \\t\\x0B\\f\\xa0\\ufeff' +
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'\\n\\r\\u2028\\u2029' +
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'\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000"'
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);
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// replace vars for `false` and `true` with boolean literals
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[/(\w+)\s*=\s*!1\b/.exec(source), /(\w+)\s*=\s*!0\b/.exec(source)].forEach(function(varName, index) {
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if (varName) {
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varName = varName[1];
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source = source.replace(RegExp('([!=]==\\s*)' + varName + '|' + varName + '(\\s*[!=]==)', 'g'), '$1' + !!index + '$2');
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}
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});
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// replace `!1` and `!0` in expressions with `false` and `true` values
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source = source
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.replace(/([!=]==\s*)!1|!1(\s*[!=]==)/g, '$1false$2')
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.replace(/([!=]==\s*)!0|!0(\s*[!=]==)/g, '$1true$2');
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// flip `typeof` expressions to help optimize Safari and
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// correct the AMD module definition for AMD build optimizers
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// (e.g. from `"number" == typeof x` to `typeof x == "number")
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source = source.replace(/(\w)?("[^"]+")\s*([!=]=)\s*(typeof(?:\s*\([^)]+\)|\s+[.\w]+(?!\[)))/g, function(match, other, type, equality, expression) {
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return (other ? other + ' ' : '') + expression + equality + type;
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});
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// add a space so `define` is detected by the Dojo builder
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source = source.replace(/(.)(define\()/, function(match, prelude, define) {
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return prelude + (/^\S/.test(prelude) ? ' ' : '') + define;
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});
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// add trailing semicolon
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if (source) {
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source = source.replace(/[\s;]*?(\s*\/\/.*\s*|\s*\/\*[^*]*\*+(?:[^\/][^*]*\*+)*\/\s*)*$/, ';$1');
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}
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// exit early if version snippet isn't found
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var snippet = /VERSION\s*[=:]\s*([\'"])(.*?)\1/.exec(source);
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if (!snippet) {
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return source;
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}
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// add new copyright header
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var version = snippet[2];
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source = licenseTemplate.replace('<%= VERSION %>', version) + '\n;' + source;
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return source;
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}
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/*--------------------------------------------------------------------------*/
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// expose `postprocess`
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if (module != require.main) {
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module.exports = postprocess;
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}
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else {
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// read the Lo-Dash source file from the first argument if the script
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// was invoked directly (e.g. `node post-compile.js source.js`) and write to
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// the same file
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(function() {
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var options = process.argv;
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if (options.length < 3) {
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return;
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}
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var filePath = options[options.length - 1],
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source = fs.readFileSync(filePath, 'utf8');
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fs.writeFileSync(filePath, postprocess(source), 'utf8');
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}());
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}
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}());
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