mirror of
https://github.com/whoisclebs/lodash.git
synced 2026-01-31 07:17:50 +00:00
446 lines
12 KiB
JavaScript
446 lines
12 KiB
JavaScript
#!/usr/bin/env node
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;(function() {
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'use strict';
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/** The Node filesystem module */
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var fs = require('fs');
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/** Used to minify variables embedded in compiled strings */
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var compiledVars = [
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'argsIndex',
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'argsLength',
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'callback',
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'collection',
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'concat',
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'ctor',
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'hasOwnProperty',
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'identity',
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'index',
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'iteratee',
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'iteratorBind',
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'length',
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'nativeKeys',
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'object',
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'ownIndex',
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'ownProps',
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'prop',
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'propertyIsEnumerable',
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'propIndex',
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'props',
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'result',
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'skipProto',
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'slice',
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'stringClass',
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'thisArg',
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'toString',
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'value',
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// lesser used variables
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'accumulator',
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'args',
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'arrayLikeClasses',
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'ArrayProto',
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'bind',
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'callee',
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'className',
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'compareAscending',
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'destValue',
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'forIn',
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'found',
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'funcs',
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'indexOf',
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'indicator',
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'isArguments',
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'isArr',
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'isArray',
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'isFunc',
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'isFunction',
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'isPlainObject',
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'methodName',
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'noaccum',
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'objectClass',
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'objectTypes',
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'pass',
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'properties',
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'property',
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'propsLength',
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'recursive',
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'source',
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'stack',
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'stackLength',
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'target',
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'valueProp'
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];
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/** Used to minify `compileIterator` option properties */
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var iteratorOptions = [
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'args',
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'array',
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'arrayBranch',
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'beforeLoop',
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'bottom',
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'exit',
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'firstArg',
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'hasDontEnumBug',
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'inLoop',
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'init',
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'isKeysFast',
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'object',
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'objectBranch',
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'noArgsEnum',
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'noCharByIndex',
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'shadowed',
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'top',
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'useHas',
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'useStrict'
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];
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/** Used to minify variables and string values to a single character */
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var minNames = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'.split('');
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minNames.push.apply(minNames, minNames.map(function(value) {
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return value + value;
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}));
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/** Used to protect the specified properties from getting minified */
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var propWhitelist = [
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'_',
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'__chain__',
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'__proto__',
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'__wrapped__',
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'after',
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'all',
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'amd',
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'any',
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'attachEvent',
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'bind',
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'bindAll',
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'chain',
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'clearTimeout',
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'clone',
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'collect',
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'compact',
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'compose',
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'contains',
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'countBy',
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'criteria',
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'debounce',
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'defaults',
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'defer',
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'delay',
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'detect',
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'difference',
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'drop',
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'each',
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'environment',
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'escape',
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'evaluate',
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'every',
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'exports',
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'extend',
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'filter',
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'find',
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'first',
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'flatten',
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'foldl',
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'foldr',
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'forEach',
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'forIn',
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'forOwn',
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'functions',
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'groupBy',
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'has',
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'head',
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'identity',
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'include',
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'index',
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'indexOf',
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'initial',
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'inject',
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'interpolate',
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'intersection',
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'invert',
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'invoke',
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'isArguments',
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'isArray',
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'isBoolean',
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'isDate',
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'isElement',
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'isEmpty',
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'isEqual',
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'isEqual',
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'isFinite',
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'isFinite',
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'isFunction',
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'isNaN',
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'isNull',
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'isNumber',
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'isObject',
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'isRegExp',
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'isString',
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'isUndefined',
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'keys',
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'last',
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'lastIndexOf',
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'map',
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'max',
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'memoize',
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'merge',
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'methods',
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'min',
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'mixin',
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'noConflict',
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'object',
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'omit',
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'once',
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'opera',
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'pairs',
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'partial',
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'pick',
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'pluck',
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'random',
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'range',
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'reduce',
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'reduceRight',
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'reject',
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'rest',
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'result',
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'select',
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'setTimeout',
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'shuffle',
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'size',
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'some',
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'sortBy',
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'sortedIndex',
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'source',
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'tail',
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'take',
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'tap',
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'template',
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'templateSettings',
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'throttle',
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'times',
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'toArray',
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'unescape',
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'union',
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'uniq',
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'unique',
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'uniqueId',
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'value',
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'values',
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'variable',
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'VERSION',
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'where',
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'without',
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'wrap',
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'zip',
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// properties used by underscore.js
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'_chain',
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'_wrapped'
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];
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/*--------------------------------------------------------------------------*/
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/**
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* Pre-process a given Lo-Dash `source`, preparing it for minification.
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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 preprocess(source) {
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// remove copyright to add later in post-compile.js
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source = source.replace(/\/\*![\s\S]+?\*\//, '');
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// remove unrecognized JSDoc tags so Closure Compiler won't complain
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source = source.replace(/@(?:alias|category)\b.*/g, '');
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// add brackets to whitelisted properties so Closure Compiler won't mung them
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// http://code.google.com/closure/compiler/docs/api-tutorial3.html#export
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source = source.replace(RegExp('\\.(' + propWhitelist.join('|') + ')\\b', 'g'), "['$1']");
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// remove brackets from `_.escape()` in `_.template`
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source = source.replace(/__e *= *_\['escape']/g, '__e=_.escape');
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// remove brackets from `_.escape()` in underscore.js `_.template`
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source = source.replace(/_\['escape'\]\(__t'/g, '_.escape(__t');
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// remove brackets from `collection.indexOf` in `_.contains`
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source = source.replace("collection['indexOf'](target)", 'collection.indexOf(target)');
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// remove brackets from `result[length].value` in `_.sortBy`
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source = source.replace("result[length]['value']", 'result[length].value');
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// remove whitespace from string literals
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source = source.replace(/'(?:(?=(\\?))\1.)*?'/g, function(string) {
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// avoids removing the '\n' of the `stringEscapes` object
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return string.replace(/\[object |delete |else if|function | in |return\s+[\w']|throw |typeof |use strict|var |@ |'\\n'|\\\\n|\\n|\s+/g, function(match) {
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return match == false || match == '\\n' ? '' : match;
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});
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});
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// add newline to `+"__p+='"` in underscore.js `_.template`
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source = source.replace(/\+"__p\+='"/g, '+"\\n__p+=\'"');
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// remove whitespace from `_.template` related regexes
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source = source.replace(/(?:reDelimiterCode\w+|reEmptyString\w+|reInsertVariable) *=.+/g, function(match) {
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return match.replace(/ |\\n/g, '');
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});
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// remove newline from double-quoted strings in `_.template`
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source = source
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.replace('"\';\\n__with ("', '"\';__with("')
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.replace('"\\n}__\\n__p += \'"', '"}____p+=\'"')
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.replace('"__p = \'"', '"__p=\'"')
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.replace('"\';\\n"', '"\';"')
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.replace("') {\\n'", "'){'")
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// remove `useSourceURL` variable
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source = source.replace(/(?:\n +\/\*[^*]*\*+(?:[^\/][^*]*\*+)*\/)?\n *try *\{(?:\s*\/\/.*)*\n *var useSourceURL[\s\S]+?catch[^}]+}\n/, '');
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// remove debug sourceURL use in `_.template`
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source = source.replace(/(?:\s*\/\/.*\n)* *if *\(useSourceURL[^}]+}/, '');
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// minify internal properties used by 'compareAscending', `_.clone`, `_.merge`, and `_.sortBy`
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(function() {
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var properties = ['criteria', 'index', 'source', 'value'],
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snippets = source.match(/( +)(?:function clone|function compareAscending|var merge|var sortBy)\b[\s\S]+?\n\1}/g);
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if (!snippets) {
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return;
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}
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snippets.forEach(function(snippet) {
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var modified = snippet,
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isCompilable = /(?:var merge|var sortBy)\b/.test(modified),
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isInlined = !/\bcreateIterator\b/.test(modified);
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// minify properties
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properties.forEach(function(property, index) {
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var reBracketProp = RegExp("\\['(" + property + ")'\\]", 'g'),
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reDotProp = RegExp('\\.' + property + '\\b', 'g'),
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rePropColon = RegExp("(')?\\b" + property + "\\1 *:", 'g');
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if (isCompilable) {
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// add quotes around properties in the inlined `_.merge` and `_.sortBy`
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// of the mobile build so Closure Compiler won't mung them
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if (isInlined) {
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modified = modified
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.replace(reBracketProp, "['" + minNames[index] + "']")
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.replace(reDotProp, "['" + minNames[index] + "']")
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.replace(rePropColon, "'" + minNames[index] + "':");
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}
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else {
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modified = modified
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.replace(reBracketProp, '.' + minNames[index])
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.replace(reDotProp, '.' + minNames[index])
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.replace(rePropColon, minNames[index] + ':');
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}
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}
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else {
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modified = modified
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.replace(reBracketProp, "['" + minNames[index] + "']")
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.replace(reDotProp, '.' + minNames[index])
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.replace(rePropColon, "'" + minNames[index] + "':")
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// correct `value.source` in regexp branch of `_.clone`
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if (property == 'source') {
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modified = modified.replace("value['" + minNames[index] + "']", "value['source']");
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}
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}
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});
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// replace with modified snippet
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source = source.replace(snippet, modified);
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});
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}());
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// minify all compilable snippets
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var snippets = source.match(
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RegExp([
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// match the `iteratorTemplate`
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'( +)var iteratorTemplate\\b[\\s\\S]+?\\n\\1}',
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// match methods created by `createIterator` calls
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'createIterator\\((?:{|[a-zA-Z]+)[\\s\\S]+?\\);\\n',
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// match variables storing `createIterator` options
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'( +)var [a-zA-Z]+IteratorOptions\\b[\\s\\S]+?\\n\\2}',
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// match the the `createIterator` function
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'( +)function createIterator\\b[\\s\\S]+?\\n\\3}'
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].join('|'), 'g')
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);
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// exit early if no compilable snippets
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if (!snippets) {
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return source;
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}
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snippets.forEach(function(snippet, index) {
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var isCreateIterator = /function createIterator\b/.test(snippet),
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isIteratorTemplate = /var iteratorTemplate\b/.test(snippet),
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modified = snippet;
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// add brackets to whitelisted properties so Closure Compiler won't mung them
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modified = modified.replace(RegExp('\\.(' + iteratorOptions.join('|') + ')\\b', 'g'), "['$1']");
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if (isCreateIterator) {
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// replace with modified snippet early and clip snippet to the `factory`
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// call so other arguments aren't minified
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source = source.replace(snippet, modified);
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snippet = modified = modified.replace(/factory\([\s\S]+$/, '');
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}
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// minify snippet variables / arguments
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compiledVars.forEach(function(variable, index) {
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// ensure properties in compiled strings aren't minified
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modified = modified.replace(RegExp('([^.]\\b)' + variable + '\\b(?!\' *[\\]:])', 'g'), '$1' + minNames[index]);
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// correct `typeof x == 'object'`
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if (variable == 'object') {
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modified = modified.replace(RegExp("(typeof [^']+')" + minNames[index] + "'", 'g'), "$1object'");
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}
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});
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// minify `createIterator` option property names
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iteratorOptions.forEach(function(property, index) {
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if (isIteratorTemplate) {
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// minify property names as interpolated template variables
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modified = modified.replace(RegExp('\\b' + property + '\\b', 'g'), minNames[index]);
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}
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else {
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if (property == 'array' || property == 'object') {
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// minify "array" and "object" sub property names
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modified = modified.replace(RegExp("'" + property + "'( *[\\]:])", 'g'), "'" + minNames[index] + "'$1");
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}
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else {
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// minify property name strings
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modified = modified.replace(RegExp("'" + property + "'", 'g'), "'" + minNames[index] + "'");
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// minify property names in regexes and accessors
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if (isCreateIterator) {
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modified = modified.replace(RegExp('([\\.|/])' + property + '\\b' , 'g'), '$1' + minNames[index]);
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}
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}
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}
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});
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// replace with modified snippet
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source = source.replace(snippet, modified);
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});
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return source;
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}
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/*--------------------------------------------------------------------------*/
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// expose `preprocess`
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if (module != require.main) {
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module.exports = preprocess;
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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 pre-compile.js source.js`) and write to
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// the same file
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(function() {
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var source = fs.readFileSync(process.argv[2], 'utf8');
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fs.writeFileSync(process.argv[2], preprocess(source), 'utf8');
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}());
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}
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}());
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