042f5429f2d137562813b21101204bd37f081623
[moodle.git] / lib / minify / matthiasmullie-minify / src / JS.php
1 <?php
3 namespace MatthiasMullie\Minify;
5 /**
6  * JavaScript minifier.
7  *
8  * Please report bugs on https://github.com/matthiasmullie/minify/issues
9  *
10  * @author Matthias Mullie <minify@mullie.eu>
11  * @author Tijs Verkoyen <minify@verkoyen.eu>
12  * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
13  * @license MIT License
14  */
15 class JS extends Minify
16 {
17     /**
18      * Var-matching regex based on http://stackoverflow.com/a/9337047/802993.
19      *
20      * Note that regular expressions using that bit must have the PCRE_UTF8
21      * pattern modifier (/u) set.
22      *
23      * @var string
24      */
25     const REGEX_VARIABLE = '\b[$A-Z\_a-z\xaa\xb5\xba\xc0-\xd6\xd8-\xf6\xf8-\x{02c1}\x{02c6}-\x{02d1}\x{02e0}-\x{02e4}\x{02ec}\x{02ee}\x{0370}-\x{0374}\x{0376}\x{0377}\x{037a}-\x{037d}\x{0386}\x{0388}-\x{038a}\x{038c}\x{038e}-\x{03a1}\x{03a3}-\x{03f5}\x{03f7}-\x{0481}\x{048a}-\x{0527}\x{0531}-\x{0556}\x{0559}\x{0561}-\x{0587}\x{05d0}-\x{05ea}\x{05f0}-\x{05f2}\x{0620}-\x{064a}\x{066e}\x{066f}\x{0671}-\x{06d3}\x{06d5}\x{06e5}\x{06e6}\x{06ee}\x{06ef}\x{06fa}-\x{06fc}\x{06ff}\x{0710}\x{0712}-\x{072f}\x{074d}-\x{07a5}\x{07b1}\x{07ca}-\x{07ea}\x{07f4}\x{07f5}\x{07fa}\x{0800}-\x{0815}\x{081a}\x{0824}\x{0828}\x{0840}-\x{0858}\x{08a0}\x{08a2}-\x{08ac}\x{0904}-\x{0939}\x{093d}\x{0950}\x{0958}-\x{0961}\x{0971}-\x{0977}\x{0979}-\x{097f}\x{0985}-\x{098c}\x{098f}\x{0990}\x{0993}-\x{09a8}\x{09aa}-\x{09b0}\x{09b2}\x{09b6}-\x{09b9}\x{09bd}\x{09ce}\x{09dc}\x{09dd}\x{09df}-\x{09e1}\x{09f0}\x{09f1}\x{0a05}-\x{0a0a}\x{0a0f}\x{0a10}\x{0a13}-\x{0a28}\x{0a2a}-\x{0a30}\x{0a32}\x{0a33}\x{0a35}\x{0a36}\x{0a38}\x{0a39}\x{0a59}-\x{0a5c}\x{0a5e}\x{0a72}-\x{0a74}\x{0a85}-\x{0a8d}\x{0a8f}-\x{0a91}\x{0a93}-\x{0aa8}\x{0aaa}-\x{0ab0}\x{0ab2}\x{0ab3}\x{0ab5}-\x{0ab9}\x{0abd}\x{0ad0}\x{0ae0}\x{0ae1}\x{0b05}-\x{0b0c}\x{0b0f}\x{0b10}\x{0b13}-\x{0b28}\x{0b2a}-\x{0b30}\x{0b32}\x{0b33}\x{0b35}-\x{0b39}\x{0b3d}\x{0b5c}\x{0b5d}\x{0b5f}-\x{0b61}\x{0b71}\x{0b83}\x{0b85}-\x{0b8a}\x{0b8e}-\x{0b90}\x{0b92}-\x{0b95}\x{0b99}\x{0b9a}\x{0b9c}\x{0b9e}\x{0b9f}\x{0ba3}\x{0ba4}\x{0ba8}-\x{0baa}\x{0bae}-\x{0bb9}\x{0bd0}\x{0c05}-\x{0c0c}\x{0c0e}-\x{0c10}\x{0c12}-\x{0c28}\x{0c2a}-\x{0c33}\x{0c35}-\x{0c39}\x{0c3d}\x{0c58}\x{0c59}\x{0c60}\x{0c61}\x{0c85}-\x{0c8c}\x{0c8e}-\x{0c90}\x{0c92}-\x{0ca8}\x{0caa}-\x{0cb3}\x{0cb5}-\x{0cb9}\x{0cbd}\x{0cde}\x{0ce0}\x{0ce1}\x{0cf1}\x{0cf2}\x{0d05}-\x{0d0c}\x{0d0e}-\x{0d10}\x{0d12}-\x{0d3a}\x{0d3d}\x{0d4e}\x{0d60}\x{0d61}\x{0d7a}-\x{0d7f}\x{0d85}-\x{0d96}\x{0d9a}-\x{0db1}\x{0db3}-\x{0dbb}\x{0dbd}\x{0dc0}-\x{0dc6}\x{0e01}-\x{0e30}\x{0e32}\x{0e33}\x{0e40}-\x{0e46}\x{0e81}\x{0e82}\x{0e84}\x{0e87}\x{0e88}\x{0e8a}\x{0e8d}\x{0e94}-\x{0e97}\x{0e99}-\x{0e9f}\x{0ea1}-\x{0ea3}\x{0ea5}\x{0ea7}\x{0eaa}\x{0eab}\x{0ead}-\x{0eb0}\x{0eb2}\x{0eb3}\x{0ebd}\x{0ec0}-\x{0ec4}\x{0ec6}\x{0edc}-\x{0edf}\x{0f00}\x{0f40}-\x{0f47}\x{0f49}-\x{0f6c}\x{0f88}-\x{0f8c}\x{1000}-\x{102a}\x{103f}\x{1050}-\x{1055}\x{105a}-\x{105d}\x{1061}\x{1065}\x{1066}\x{106e}-\x{1070}\x{1075}-\x{1081}\x{108e}\x{10a0}-\x{10c5}\x{10c7}\x{10cd}\x{10d0}-\x{10fa}\x{10fc}-\x{1248}\x{124a}-\x{124d}\x{1250}-\x{1256}\x{1258}\x{125a}-\x{125d}\x{1260}-\x{1288}\x{128a}-\x{128d}\x{1290}-\x{12b0}\x{12b2}-\x{12b5}\x{12b8}-\x{12be}\x{12c0}\x{12c2}-\x{12c5}\x{12c8}-\x{12d6}\x{12d8}-\x{1310}\x{1312}-\x{1315}\x{1318}-\x{135a}\x{1380}-\x{138f}\x{13a0}-\x{13f4}\x{1401}-\x{166c}\x{166f}-\x{167f}\x{1681}-\x{169a}\x{16a0}-\x{16ea}\x{16ee}-\x{16f0}\x{1700}-\x{170c}\x{170e}-\x{1711}\x{1720}-\x{1731}\x{1740}-\x{1751}\x{1760}-\x{176c}\x{176e}-\x{1770}\x{1780}-\x{17b3}\x{17d7}\x{17dc}\x{1820}-\x{1877}\x{1880}-\x{18a8}\x{18aa}\x{18b0}-\x{18f5}\x{1900}-\x{191c}\x{1950}-\x{196d}\x{1970}-\x{1974}\x{1980}-\x{19ab}\x{19c1}-\x{19c7}\x{1a00}-\x{1a16}\x{1a20}-\x{1a54}\x{1aa7}\x{1b05}-\x{1b33}\x{1b45}-\x{1b4b}\x{1b83}-\x{1ba0}\x{1bae}\x{1baf}\x{1bba}-\x{1be5}\x{1c00}-\x{1c23}\x{1c4d}-\x{1c4f}\x{1c5a}-\x{1c7d}\x{1ce9}-\x{1cec}\x{1cee}-\x{1cf1}\x{1cf5}\x{1cf6}\x{1d00}-\x{1dbf}\x{1e00}-\x{1f15}\x{1f18}-\x{1f1d}\x{1f20}-\x{1f45}\x{1f48}-\x{1f4d}\x{1f50}-\x{1f57}\x{1f59}\x{1f5b}\x{1f5d}\x{1f5f}-\x{1f7d}\x{1f80}-\x{1fb4}\x{1fb6}-\x{1fbc}\x{1fbe}\x{1fc2}-\x{1fc4}\x{1fc6}-\x{1fcc}\x{1fd0}-\x{1fd3}\x{1fd6}-\x{1fdb}\x{1fe0}-\x{1fec}\x{1ff2}-\x{1ff4}\x{1ff6}-\x{1ffc}\x{2071}\x{207f}\x{2090}-\x{209c}\x{2102}\x{2107}\x{210a}-\x{2113}\x{2115}\x{2119}-\x{211d}\x{2124}\x{2126}\x{2128}\x{212a}-\x{212d}\x{212f}-\x{2139}\x{213c}-\x{213f}\x{2145}-\x{2149}\x{214e}\x{2160}-\x{2188}\x{2c00}-\x{2c2e}\x{2c30}-\x{2c5e}\x{2c60}-\x{2ce4}\x{2ceb}-\x{2cee}\x{2cf2}\x{2cf3}\x{2d00}-\x{2d25}\x{2d27}\x{2d2d}\x{2d30}-\x{2d67}\x{2d6f}\x{2d80}-\x{2d96}\x{2da0}-\x{2da6}\x{2da8}-\x{2dae}\x{2db0}-\x{2db6}\x{2db8}-\x{2dbe}\x{2dc0}-\x{2dc6}\x{2dc8}-\x{2dce}\x{2dd0}-\x{2dd6}\x{2dd8}-\x{2dde}\x{2e2f}\x{3005}-\x{3007}\x{3021}-\x{3029}\x{3031}-\x{3035}\x{3038}-\x{303c}\x{3041}-\x{3096}\x{309d}-\x{309f}\x{30a1}-\x{30fa}\x{30fc}-\x{30ff}\x{3105}-\x{312d}\x{3131}-\x{318e}\x{31a0}-\x{31ba}\x{31f0}-\x{31ff}\x{3400}-\x{4db5}\x{4e00}-\x{9fcc}\x{a000}-\x{a48c}\x{a4d0}-\x{a4fd}\x{a500}-\x{a60c}\x{a610}-\x{a61f}\x{a62a}\x{a62b}\x{a640}-\x{a66e}\x{a67f}-\x{a697}\x{a6a0}-\x{a6ef}\x{a717}-\x{a71f}\x{a722}-\x{a788}\x{a78b}-\x{a78e}\x{a790}-\x{a793}\x{a7a0}-\x{a7aa}\x{a7f8}-\x{a801}\x{a803}-\x{a805}\x{a807}-\x{a80a}\x{a80c}-\x{a822}\x{a840}-\x{a873}\x{a882}-\x{a8b3}\x{a8f2}-\x{a8f7}\x{a8fb}\x{a90a}-\x{a925}\x{a930}-\x{a946}\x{a960}-\x{a97c}\x{a984}-\x{a9b2}\x{a9cf}\x{aa00}-\x{aa28}\x{aa40}-\x{aa42}\x{aa44}-\x{aa4b}\x{aa60}-\x{aa76}\x{aa7a}\x{aa80}-\x{aaaf}\x{aab1}\x{aab5}\x{aab6}\x{aab9}-\x{aabd}\x{aac0}\x{aac2}\x{aadb}-\x{aadd}\x{aae0}-\x{aaea}\x{aaf2}-\x{aaf4}\x{ab01}-\x{ab06}\x{ab09}-\x{ab0e}\x{ab11}-\x{ab16}\x{ab20}-\x{ab26}\x{ab28}-\x{ab2e}\x{abc0}-\x{abe2}\x{ac00}-\x{d7a3}\x{d7b0}-\x{d7c6}\x{d7cb}-\x{d7fb}\x{f900}-\x{fa6d}\x{fa70}-\x{fad9}\x{fb00}-\x{fb06}\x{fb13}-\x{fb17}\x{fb1d}\x{fb1f}-\x{fb28}\x{fb2a}-\x{fb36}\x{fb38}-\x{fb3c}\x{fb3e}\x{fb40}\x{fb41}\x{fb43}\x{fb44}\x{fb46}-\x{fbb1}\x{fbd3}-\x{fd3d}\x{fd50}-\x{fd8f}\x{fd92}-\x{fdc7}\x{fdf0}-\x{fdfb}\x{fe70}-\x{fe74}\x{fe76}-\x{fefc}\x{ff21}-\x{ff3a}\x{ff41}-\x{ff5a}\x{ff66}-\x{ffbe}\x{ffc2}-\x{ffc7}\x{ffca}-\x{ffcf}\x{ffd2}-\x{ffd7}\x{ffda}-\x{ffdc}][$A-Z\_a-z\xaa\xb5\xba\xc0-\xd6\xd8-\xf6\xf8-\x{02c1}\x{02c6}-\x{02d1}\x{02e0}-\x{02e4}\x{02ec}\x{02ee}\x{0370}-\x{0374}\x{0376}\x{0377}\x{037a}-\x{037d}\x{0386}\x{0388}-\x{038a}\x{038c}\x{038e}-\x{03a1}\x{03a3}-\x{03f5}\x{03f7}-\x{0481}\x{048a}-\x{0527}\x{0531}-\x{0556}\x{0559}\x{0561}-\x{0587}\x{05d0}-\x{05ea}\x{05f0}-\x{05f2}\x{0620}-\x{064a}\x{066e}\x{066f}\x{0671}-\x{06d3}\x{06d5}\x{06e5}\x{06e6}\x{06ee}\x{06ef}\x{06fa}-\x{06fc}\x{06ff}\x{0710}\x{0712}-\x{072f}\x{074d}-\x{07a5}\x{07b1}\x{07ca}-\x{07ea}\x{07f4}\x{07f5}\x{07fa}\x{0800}-\x{0815}\x{081a}\x{0824}\x{0828}\x{0840}-\x{0858}\x{08a0}\x{08a2}-\x{08ac}\x{0904}-\x{0939}\x{093d}\x{0950}\x{0958}-\x{0961}\x{0971}-\x{0977}\x{0979}-\x{097f}\x{0985}-\x{098c}\x{098f}\x{0990}\x{0993}-\x{09a8}\x{09aa}-\x{09b0}\x{09b2}\x{09b6}-\x{09b9}\x{09bd}\x{09ce}\x{09dc}\x{09dd}\x{09df}-\x{09e1}\x{09f0}\x{09f1}\x{0a05}-\x{0a0a}\x{0a0f}\x{0a10}\x{0a13}-\x{0a28}\x{0a2a}-\x{0a30}\x{0a32}\x{0a33}\x{0a35}\x{0a36}\x{0a38}\x{0a39}\x{0a59}-\x{0a5c}\x{0a5e}\x{0a72}-\x{0a74}\x{0a85}-\x{0a8d}\x{0a8f}-\x{0a91}\x{0a93}-\x{0aa8}\x{0aaa}-\x{0ab0}\x{0ab2}\x{0ab3}\x{0ab5}-\x{0ab9}\x{0abd}\x{0ad0}\x{0ae0}\x{0ae1}\x{0b05}-\x{0b0c}\x{0b0f}\x{0b10}\x{0b13}-\x{0b28}\x{0b2a}-\x{0b30}\x{0b32}\x{0b33}\x{0b35}-\x{0b39}\x{0b3d}\x{0b5c}\x{0b5d}\x{0b5f}-\x{0b61}\x{0b71}\x{0b83}\x{0b85}-\x{0b8a}\x{0b8e}-\x{0b90}\x{0b92}-\x{0b95}\x{0b99}\x{0b9a}\x{0b9c}\x{0b9e}\x{0b9f}\x{0ba3}\x{0ba4}\x{0ba8}-\x{0baa}\x{0bae}-\x{0bb9}\x{0bd0}\x{0c05}-\x{0c0c}\x{0c0e}-\x{0c10}\x{0c12}-\x{0c28}\x{0c2a}-\x{0c33}\x{0c35}-\x{0c39}\x{0c3d}\x{0c58}\x{0c59}\x{0c60}\x{0c61}\x{0c85}-\x{0c8c}\x{0c8e}-\x{0c90}\x{0c92}-\x{0ca8}\x{0caa}-\x{0cb3}\x{0cb5}-\x{0cb9}\x{0cbd}\x{0cde}\x{0ce0}\x{0ce1}\x{0cf1}\x{0cf2}\x{0d05}-\x{0d0c}\x{0d0e}-\x{0d10}\x{0d12}-\x{0d3a}\x{0d3d}\x{0d4e}\x{0d60}\x{0d61}\x{0d7a}-\x{0d7f}\x{0d85}-\x{0d96}\x{0d9a}-\x{0db1}\x{0db3}-\x{0dbb}\x{0dbd}\x{0dc0}-\x{0dc6}\x{0e01}-\x{0e30}\x{0e32}\x{0e33}\x{0e40}-\x{0e46}\x{0e81}\x{0e82}\x{0e84}\x{0e87}\x{0e88}\x{0e8a}\x{0e8d}\x{0e94}-\x{0e97}\x{0e99}-\x{0e9f}\x{0ea1}-\x{0ea3}\x{0ea5}\x{0ea7}\x{0eaa}\x{0eab}\x{0ead}-\x{0eb0}\x{0eb2}\x{0eb3}\x{0ebd}\x{0ec0}-\x{0ec4}\x{0ec6}\x{0edc}-\x{0edf}\x{0f00}\x{0f40}-\x{0f47}\x{0f49}-\x{0f6c}\x{0f88}-\x{0f8c}\x{1000}-\x{102a}\x{103f}\x{1050}-\x{1055}\x{105a}-\x{105d}\x{1061}\x{1065}\x{1066}\x{106e}-\x{1070}\x{1075}-\x{1081}\x{108e}\x{10a0}-\x{10c5}\x{10c7}\x{10cd}\x{10d0}-\x{10fa}\x{10fc}-\x{1248}\x{124a}-\x{124d}\x{1250}-\x{1256}\x{1258}\x{125a}-\x{125d}\x{1260}-\x{1288}\x{128a}-\x{128d}\x{1290}-\x{12b0}\x{12b2}-\x{12b5}\x{12b8}-\x{12be}\x{12c0}\x{12c2}-\x{12c5}\x{12c8}-\x{12d6}\x{12d8}-\x{1310}\x{1312}-\x{1315}\x{1318}-\x{135a}\x{1380}-\x{138f}\x{13a0}-\x{13f4}\x{1401}-\x{166c}\x{166f}-\x{167f}\x{1681}-\x{169a}\x{16a0}-\x{16ea}\x{16ee}-\x{16f0}\x{1700}-\x{170c}\x{170e}-\x{1711}\x{1720}-\x{1731}\x{1740}-\x{1751}\x{1760}-\x{176c}\x{176e}-\x{1770}\x{1780}-\x{17b3}\x{17d7}\x{17dc}\x{1820}-\x{1877}\x{1880}-\x{18a8}\x{18aa}\x{18b0}-\x{18f5}\x{1900}-\x{191c}\x{1950}-\x{196d}\x{1970}-\x{1974}\x{1980}-\x{19ab}\x{19c1}-\x{19c7}\x{1a00}-\x{1a16}\x{1a20}-\x{1a54}\x{1aa7}\x{1b05}-\x{1b33}\x{1b45}-\x{1b4b}\x{1b83}-\x{1ba0}\x{1bae}\x{1baf}\x{1bba}-\x{1be5}\x{1c00}-\x{1c23}\x{1c4d}-\x{1c4f}\x{1c5a}-\x{1c7d}\x{1ce9}-\x{1cec}\x{1cee}-\x{1cf1}\x{1cf5}\x{1cf6}\x{1d00}-\x{1dbf}\x{1e00}-\x{1f15}\x{1f18}-\x{1f1d}\x{1f20}-\x{1f45}\x{1f48}-\x{1f4d}\x{1f50}-\x{1f57}\x{1f59}\x{1f5b}\x{1f5d}\x{1f5f}-\x{1f7d}\x{1f80}-\x{1fb4}\x{1fb6}-\x{1fbc}\x{1fbe}\x{1fc2}-\x{1fc4}\x{1fc6}-\x{1fcc}\x{1fd0}-\x{1fd3}\x{1fd6}-\x{1fdb}\x{1fe0}-\x{1fec}\x{1ff2}-\x{1ff4}\x{1ff6}-\x{1ffc}\x{2071}\x{207f}\x{2090}-\x{209c}\x{2102}\x{2107}\x{210a}-\x{2113}\x{2115}\x{2119}-\x{211d}\x{2124}\x{2126}\x{2128}\x{212a}-\x{212d}\x{212f}-\x{2139}\x{213c}-\x{213f}\x{2145}-\x{2149}\x{214e}\x{2160}-\x{2188}\x{2c00}-\x{2c2e}\x{2c30}-\x{2c5e}\x{2c60}-\x{2ce4}\x{2ceb}-\x{2cee}\x{2cf2}\x{2cf3}\x{2d00}-\x{2d25}\x{2d27}\x{2d2d}\x{2d30}-\x{2d67}\x{2d6f}\x{2d80}-\x{2d96}\x{2da0}-\x{2da6}\x{2da8}-\x{2dae}\x{2db0}-\x{2db6}\x{2db8}-\x{2dbe}\x{2dc0}-\x{2dc6}\x{2dc8}-\x{2dce}\x{2dd0}-\x{2dd6}\x{2dd8}-\x{2dde}\x{2e2f}\x{3005}-\x{3007}\x{3021}-\x{3029}\x{3031}-\x{3035}\x{3038}-\x{303c}\x{3041}-\x{3096}\x{309d}-\x{309f}\x{30a1}-\x{30fa}\x{30fc}-\x{30ff}\x{3105}-\x{312d}\x{3131}-\x{318e}\x{31a0}-\x{31ba}\x{31f0}-\x{31ff}\x{3400}-\x{4db5}\x{4e00}-\x{9fcc}\x{a000}-\x{a48c}\x{a4d0}-\x{a4fd}\x{a500}-\x{a60c}\x{a610}-\x{a61f}\x{a62a}\x{a62b}\x{a640}-\x{a66e}\x{a67f}-\x{a697}\x{a6a0}-\x{a6ef}\x{a717}-\x{a71f}\x{a722}-\x{a788}\x{a78b}-\x{a78e}\x{a790}-\x{a793}\x{a7a0}-\x{a7aa}\x{a7f8}-\x{a801}\x{a803}-\x{a805}\x{a807}-\x{a80a}\x{a80c}-\x{a822}\x{a840}-\x{a873}\x{a882}-\x{a8b3}\x{a8f2}-\x{a8f7}\x{a8fb}\x{a90a}-\x{a925}\x{a930}-\x{a946}\x{a960}-\x{a97c}\x{a984}-\x{a9b2}\x{a9cf}\x{aa00}-\x{aa28}\x{aa40}-\x{aa42}\x{aa44}-\x{aa4b}\x{aa60}-\x{aa76}\x{aa7a}\x{aa80}-\x{aaaf}\x{aab1}\x{aab5}\x{aab6}\x{aab9}-\x{aabd}\x{aac0}\x{aac2}\x{aadb}-\x{aadd}\x{aae0}-\x{aaea}\x{aaf2}-\x{aaf4}\x{ab01}-\x{ab06}\x{ab09}-\x{ab0e}\x{ab11}-\x{ab16}\x{ab20}-\x{ab26}\x{ab28}-\x{ab2e}\x{abc0}-\x{abe2}\x{ac00}-\x{d7a3}\x{d7b0}-\x{d7c6}\x{d7cb}-\x{d7fb}\x{f900}-\x{fa6d}\x{fa70}-\x{fad9}\x{fb00}-\x{fb06}\x{fb13}-\x{fb17}\x{fb1d}\x{fb1f}-\x{fb28}\x{fb2a}-\x{fb36}\x{fb38}-\x{fb3c}\x{fb3e}\x{fb40}\x{fb41}\x{fb43}\x{fb44}\x{fb46}-\x{fbb1}\x{fbd3}-\x{fd3d}\x{fd50}-\x{fd8f}\x{fd92}-\x{fdc7}\x{fdf0}-\x{fdfb}\x{fe70}-\x{fe74}\x{fe76}-\x{fefc}\x{ff21}-\x{ff3a}\x{ff41}-\x{ff5a}\x{ff66}-\x{ffbe}\x{ffc2}-\x{ffc7}\x{ffca}-\x{ffcf}\x{ffd2}-\x{ffd7}\x{ffda}-\x{ffdc}0-9\x{0300}-\x{036f}\x{0483}-\x{0487}\x{0591}-\x{05bd}\x{05bf}\x{05c1}\x{05c2}\x{05c4}\x{05c5}\x{05c7}\x{0610}-\x{061a}\x{064b}-\x{0669}\x{0670}\x{06d6}-\x{06dc}\x{06df}-\x{06e4}\x{06e7}\x{06e8}\x{06ea}-\x{06ed}\x{06f0}-\x{06f9}\x{0711}\x{0730}-\x{074a}\x{07a6}-\x{07b0}\x{07c0}-\x{07c9}\x{07eb}-\x{07f3}\x{0816}-\x{0819}\x{081b}-\x{0823}\x{0825}-\x{0827}\x{0829}-\x{082d}\x{0859}-\x{085b}\x{08e4}-\x{08fe}\x{0900}-\x{0903}\x{093a}-\x{093c}\x{093e}-\x{094f}\x{0951}-\x{0957}\x{0962}\x{0963}\x{0966}-\x{096f}\x{0981}-\x{0983}\x{09bc}\x{09be}-\x{09c4}\x{09c7}\x{09c8}\x{09cb}-\x{09cd}\x{09d7}\x{09e2}\x{09e3}\x{09e6}-\x{09ef}\x{0a01}-\x{0a03}\x{0a3c}\x{0a3e}-\x{0a42}\x{0a47}\x{0a48}\x{0a4b}-\x{0a4d}\x{0a51}\x{0a66}-\x{0a71}\x{0a75}\x{0a81}-\x{0a83}\x{0abc}\x{0abe}-\x{0ac5}\x{0ac7}-\x{0ac9}\x{0acb}-\x{0acd}\x{0ae2}\x{0ae3}\x{0ae6}-\x{0aef}\x{0b01}-\x{0b03}\x{0b3c}\x{0b3e}-\x{0b44}\x{0b47}\x{0b48}\x{0b4b}-\x{0b4d}\x{0b56}\x{0b57}\x{0b62}\x{0b63}\x{0b66}-\x{0b6f}\x{0b82}\x{0bbe}-\x{0bc2}\x{0bc6}-\x{0bc8}\x{0bca}-\x{0bcd}\x{0bd7}\x{0be6}-\x{0bef}\x{0c01}-\x{0c03}\x{0c3e}-\x{0c44}\x{0c46}-\x{0c48}\x{0c4a}-\x{0c4d}\x{0c55}\x{0c56}\x{0c62}\x{0c63}\x{0c66}-\x{0c6f}\x{0c82}\x{0c83}\x{0cbc}\x{0cbe}-\x{0cc4}\x{0cc6}-\x{0cc8}\x{0cca}-\x{0ccd}\x{0cd5}\x{0cd6}\x{0ce2}\x{0ce3}\x{0ce6}-\x{0cef}\x{0d02}\x{0d03}\x{0d3e}-\x{0d44}\x{0d46}-\x{0d48}\x{0d4a}-\x{0d4d}\x{0d57}\x{0d62}\x{0d63}\x{0d66}-\x{0d6f}\x{0d82}\x{0d83}\x{0dca}\x{0dcf}-\x{0dd4}\x{0dd6}\x{0dd8}-\x{0ddf}\x{0df2}\x{0df3}\x{0e31}\x{0e34}-\x{0e3a}\x{0e47}-\x{0e4e}\x{0e50}-\x{0e59}\x{0eb1}\x{0eb4}-\x{0eb9}\x{0ebb}\x{0ebc}\x{0ec8}-\x{0ecd}\x{0ed0}-\x{0ed9}\x{0f18}\x{0f19}\x{0f20}-\x{0f29}\x{0f35}\x{0f37}\x{0f39}\x{0f3e}\x{0f3f}\x{0f71}-\x{0f84}\x{0f86}\x{0f87}\x{0f8d}-\x{0f97}\x{0f99}-\x{0fbc}\x{0fc6}\x{102b}-\x{103e}\x{1040}-\x{1049}\x{1056}-\x{1059}\x{105e}-\x{1060}\x{1062}-\x{1064}\x{1067}-\x{106d}\x{1071}-\x{1074}\x{1082}-\x{108d}\x{108f}-\x{109d}\x{135d}-\x{135f}\x{1712}-\x{1714}\x{1732}-\x{1734}\x{1752}\x{1753}\x{1772}\x{1773}\x{17b4}-\x{17d3}\x{17dd}\x{17e0}-\x{17e9}\x{180b}-\x{180d}\x{1810}-\x{1819}\x{18a9}\x{1920}-\x{192b}\x{1930}-\x{193b}\x{1946}-\x{194f}\x{19b0}-\x{19c0}\x{19c8}\x{19c9}\x{19d0}-\x{19d9}\x{1a17}-\x{1a1b}\x{1a55}-\x{1a5e}\x{1a60}-\x{1a7c}\x{1a7f}-\x{1a89}\x{1a90}-\x{1a99}\x{1b00}-\x{1b04}\x{1b34}-\x{1b44}\x{1b50}-\x{1b59}\x{1b6b}-\x{1b73}\x{1b80}-\x{1b82}\x{1ba1}-\x{1bad}\x{1bb0}-\x{1bb9}\x{1be6}-\x{1bf3}\x{1c24}-\x{1c37}\x{1c40}-\x{1c49}\x{1c50}-\x{1c59}\x{1cd0}-\x{1cd2}\x{1cd4}-\x{1ce8}\x{1ced}\x{1cf2}-\x{1cf4}\x{1dc0}-\x{1de6}\x{1dfc}-\x{1dff}\x{200c}\x{200d}\x{203f}\x{2040}\x{2054}\x{20d0}-\x{20dc}\x{20e1}\x{20e5}-\x{20f0}\x{2cef}-\x{2cf1}\x{2d7f}\x{2de0}-\x{2dff}\x{302a}-\x{302f}\x{3099}\x{309a}\x{a620}-\x{a629}\x{a66f}\x{a674}-\x{a67d}\x{a69f}\x{a6f0}\x{a6f1}\x{a802}\x{a806}\x{a80b}\x{a823}-\x{a827}\x{a880}\x{a881}\x{a8b4}-\x{a8c4}\x{a8d0}-\x{a8d9}\x{a8e0}-\x{a8f1}\x{a900}-\x{a909}\x{a926}-\x{a92d}\x{a947}-\x{a953}\x{a980}-\x{a983}\x{a9b3}-\x{a9c0}\x{a9d0}-\x{a9d9}\x{aa29}-\x{aa36}\x{aa43}\x{aa4c}\x{aa4d}\x{aa50}-\x{aa59}\x{aa7b}\x{aab0}\x{aab2}-\x{aab4}\x{aab7}\x{aab8}\x{aabe}\x{aabf}\x{aac1}\x{aaeb}-\x{aaef}\x{aaf5}\x{aaf6}\x{abe3}-\x{abea}\x{abec}\x{abed}\x{abf0}-\x{abf9}\x{fb1e}\x{fe00}-\x{fe0f}\x{fe20}-\x{fe26}\x{fe33}\x{fe34}\x{fe4d}-\x{fe4f}\x{ff10}-\x{ff19}\x{ff3f}]*\b';
27     /**
28      * Full list of JavaScript reserved words.
29      * Will be loaded from /data/js/keywords_reserved.txt.
30      *
31      * @see https://mathiasbynens.be/notes/reserved-keywords
32      *
33      * @var string[]
34      */
35     protected $keywordsReserved = array();
37     /**
38      * List of JavaScript reserved words that accept a <variable, value, ...>
39      * after them. Some end of lines are not the end of a statement, like with
40      * these keywords.
41      *
42      * E.g.: we shouldn't insert a ; after this else
43      * else
44      *     console.log('this is quite fine')
45      *
46      * Will be loaded from /data/js/keywords_before.txt
47      *
48      * @var string[]
49      */
50     protected $keywordsBefore = array();
52     /**
53      * List of JavaScript reserved words that accept a <variable, value, ...>
54      * before them. Some end of lines are not the end of a statement, like when
55      * continued by one of these keywords on the newline.
56      *
57      * E.g.: we shouldn't insert a ; before this instanceof
58      * variable
59      *     instanceof String
60      *
61      * Will be loaded from /data/js/keywords_after.txt
62      *
63      * @var string[]
64      */
65     protected $keywordsAfter = array();
67     /**
68      * List of all JavaScript operators.
69      *
70      * Will be loaded from /data/js/operators.txt
71      *
72      * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
73      *
74      * @var string[]
75      */
76     protected $operators = array();
78     /**
79      * List of JavaScript operators that accept a <variable, value, ...> after
80      * them. Some end of lines are not the end of a statement, like with these
81      * operators.
82      *
83      * Note: Most operators are fine, we've only removed ++ and --.
84      * ++ & -- have to be joined with the value they're in-/decrementing.
85      *
86      * Will be loaded from /data/js/operators_before.txt
87      *
88      * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
89      *
90      * @var string[]
91      */
92     protected $operatorsBefore = array();
94     /**
95      * List of JavaScript operators that accept a <variable, value, ...> before
96      * them. Some end of lines are not the end of a statement, like when
97      * continued by one of these operators on the newline.
98      *
99      * Note: Most operators are fine, we've only removed ), ], ++, --, ! and ~.
100      * There can't be a newline separating ! or ~ and whatever it is negating.
101      * ++ & -- have to be joined with the value they're in-/decrementing.
102      * ) & ] are "special" in that they have lots or usecases. () for example
103      * is used for function calls, for grouping, in if () and for (), ...
104      *
105      * Will be loaded from /data/js/operators_after.txt
106      *
107      * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
108      *
109      * @var string[]
110      */
111     protected $operatorsAfter = array();
113     /**
114      * @var array
115      */
116     protected $nestedExtracted = array();
118     /**
119      * {@inheritdoc}
120      */
121     public function __construct()
122     {
123         call_user_func_array(array('parent', '__construct'), func_get_args());
125         $dataDir = __DIR__.'/../data/js/';
126         $options = FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES;
127         $this->keywordsReserved = file($dataDir.'keywords_reserved.txt', $options);
128         $this->keywordsBefore = file($dataDir.'keywords_before.txt', $options);
129         $this->keywordsAfter = file($dataDir.'keywords_after.txt', $options);
130         $this->operators = file($dataDir.'operators.txt', $options);
131         $this->operatorsBefore = file($dataDir.'operators_before.txt', $options);
132         $this->operatorsAfter = file($dataDir.'operators_after.txt', $options);
133     }
135     /**
136      * Minify the data.
137      * Perform JS optimizations.
138      *
139      * @param string[optional] $path Path to write the data to
140      *
141      * @return string The minified data
142      */
143     public function execute($path = null)
144     {
145         $content = '';
147         // loop files
148         foreach ($this->data as $source => $js) {
149             /*
150              * Combine js: separating the scripts by a ;
151              * I'm also adding a newline: it will be eaten when whitespace is
152              * stripped, but we need to make sure we're not just appending
153              * a new script right after a previous script that ended with a
154              * singe-line comment on the last line (in which case it would also
155              * be seen as part of that comment)
156              */
157             $content .= $js."\n;";
158         }
160         /*
161          * Let's first take out strings, comments and regular expressions.
162          * All of these can contain JS code-like characters, and we should make
163          * sure any further magic ignores anything inside of these.
164          *
165          * Consider this example, where we should not strip any whitespace:
166          * var str = "a   test";
167          *
168          * Comments will be removed altogether, strings and regular expressions
169          * will be replaced by placeholder text, which we'll restore later.
170          */
171         $this->extractStrings('\'"`');
172         $this->stripComments();
173         $this->extractRegex();
174         $content = $this->replace($content);
176         $content = $this->propertyNotation($content);
177         $content = $this->shortenBools($content);
178         $content = $this->stripWhitespace($content);
180         /*
181          * Earlier, we extracted strings & regular expressions and replaced them
182          * with placeholder text. This will restore them.
183          */
184         $content = $this->restoreExtractedData($content);
186         return $content;
187     }
189     /**
190      * Strip comments from source code.
191      */
192     protected function stripComments()
193     {
194         // single-line comments
195         $this->registerPattern('/\/\/.*$/m', '');
197         // multi-line comments
198         $this->registerPattern('/\/\*.*?\*\//s', '');
199     }
201     /**
202      * JS can have /-delimited regular expressions, like: /ab+c/.match(string).
203      *
204      * The content inside the regex can contain characters that may be confused
205      * for JS code: e.g. it could contain whitespace it needs to match & we
206      * don't want to strip whitespace in there.
207      *
208      * The regex can be pretty simple: we don't have to care about comments,
209      * (which also use slashes) because stripComments() will have stripped those
210      * already.
211      *
212      * This method will replace all string content with simple REGEX#
213      * placeholder text, so we've rid all regular expressions from characters
214      * that may be misinterpreted. Original regex content will be saved in
215      * $this->extracted and after doing all other minifying, we can restore the
216      * original content via restoreRegex()
217      */
218     protected function extractRegex()
219     {
220         // PHP only supports $this inside anonymous functions since 5.4
221         $minifier = $this;
222         $callback = function ($match) use ($minifier) {
223             $count = count($minifier->extracted);
224             $placeholder = '"'.$count.'"';
225             $minifier->extracted[$placeholder] = $match['regex'];
227             // because we're also trying to find regular expressions that follow
228             // if/when/for statements, we should also make sure that the content
229             // within these statements is also minified...
230             // e.g. `if("some   string"/* or comment */)` should become
231             //      `if("some   string")`
232             if (isset($match['before'])) {
233                 $other = new static();
234                 $other->extractStrings('\'"`', "$count-");
235                 $other->stripComments();
236                 $match['before'] = $other->replace($match['before']);
237                 $this->nestedExtracted += $other->extracted;
238             }
240             return (isset($match['before']) ? $match['before'] : '').
241                 $placeholder.
242                 (isset($match['after']) ? $match['after'] : '');
243         };
245         $pattern = '(?P<regex>\/.+?((?<!\\\\)\\\\\\\\)*\/[gimy]*)(?![0-9a-zA-Z\/])';
247         // a regular expression can only be followed by a few operators or some
248         // of the RegExp methods (a `\` followed by a variable or value is
249         // likely part of a division, not a regex)
250         $keywords = array('do', 'in', 'new', 'else', 'throw', 'yield', 'delete', 'return',  'typeof');
251         $before = '(?P<before>[=:,;\}\(\{&\|!]|^|'.implode('|', $keywords).')';
252         $propertiesAndMethods = array(
253             // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Properties
254             'prototype',
255             'length',
256             'lastIndex',
257             // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Properties_2
258             'constructor',
259             'flags',
260             'global',
261             'ignoreCase',
262             'multiline',
263             'source',
264             'sticky',
265             'unicode',
266             // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Methods_2
267             'compile(',
268             'exec(',
269             'test(',
270             'match',
271             'replace(',
272             'search(',
273             'split(',
274             'toSource(',
275             'toString(',
276         );
277         $delimiters = array_fill(0, count($propertiesAndMethods), '/');
278         $propertiesAndMethods = array_map('preg_quote', $propertiesAndMethods, $delimiters);
279         $after = '(?P<after>[\.,;\)\}&\|+]|$|\.('.implode('|', $propertiesAndMethods).'))';
280         $this->registerPattern('/'.$before.'\s*'.$pattern.'\s*'.$after.'/', $callback);
282         // we didn't check for regular expressions after `)`, because that is
283         // more often than not not a character where a regex can follow (e.g.
284         // (1+2)/3/4 -> /3/ could be considered a regex, but it's not)
285         // however, after single-line if/while/for, there could very well be a
286         // regex after `)` (e.g. if(true)/regex/)
287         // there is one problem, though: it's (near) impossible to check for
288         // when the if/while/for statement is closed (same amount of closing
289         // brackets as there were opened), so I'll ignore single-line statements
290         // with nested brackets followed by a regex for now...
291         $before = '(?P<before>\b(if|while|for)\s*\((?P<code>[^\(]+?)\))';
292         $this->registerPattern('/'.$before.'\s*'.$pattern.'\s*'.$after.'/', $callback);
294         // 1 more edge case: a regex can be followed by a lot more operators or
295         // keywords if there's a newline (ASI) in between, where the operator
296         // actually starts a new statement
297         // (https://github.com/matthiasmullie/minify/issues/56)
298         $operators = $this->getOperatorsForRegex($this->operatorsBefore, '/');
299         $operators += $this->getOperatorsForRegex($this->keywordsReserved, '/');
300         $after = '(?P<after>\n\s*('.implode('|', $operators).'))';
301         $this->registerPattern('/'.$pattern.'\s*'.$after.'/', $callback);
302     }
304     /**
305      * In addition to the regular restore routine, we also need to restore a few
306      * more things that have been extracted as part of the regex extraction...
307      *
308      * {@inheritdoc}
309      */
310     protected function restoreExtractedData($content)
311     {
312         // restore regular extracted stuff
313         $content = parent::restoreExtractedData($content);
315         // restore nested stuff from within regex extraction
316         $content = strtr($content, $this->nestedExtracted);
318         return $content;
319     }
321     /**
322      * Strip whitespace.
323      *
324      * We won't strip *all* whitespace, but as much as possible. The thing that
325      * we'll preserve are newlines we're unsure about.
326      * JavaScript doesn't require statements to be terminated with a semicolon.
327      * It will automatically fix missing semicolons with ASI (automatic semi-
328      * colon insertion) at the end of line causing errors (without semicolon.)
329      *
330      * Because it's sometimes hard to tell if a newline is part of a statement
331      * that should be terminated or not, we'll just leave some of them alone.
332      *
333      * @param string $content The content to strip the whitespace for
334      *
335      * @return string
336      */
337     protected function stripWhitespace($content)
338     {
339         // uniform line endings, make them all line feed
340         $content = str_replace(array("\r\n", "\r"), "\n", $content);
342         // collapse all non-line feed whitespace into a single space
343         $content = preg_replace('/[^\S\n]+/', ' ', $content);
345         // strip leading & trailing whitespace
346         $content = str_replace(array(" \n", "\n "), "\n", $content);
348         // collapse consecutive line feeds into just 1
349         $content = preg_replace('/\n+/', "\n", $content);
351         $operatorsBefore = $this->getOperatorsForRegex($this->operatorsBefore, '/');
352         $operatorsAfter = $this->getOperatorsForRegex($this->operatorsAfter, '/');
353         $operators = $this->getOperatorsForRegex($this->operators, '/');
354         $keywordsBefore = $this->getKeywordsForRegex($this->keywordsBefore, '/');
355         $keywordsAfter = $this->getKeywordsForRegex($this->keywordsAfter, '/');
357         // strip whitespace that ends in (or next line begin with) an operator
358         // that allows statements to be broken up over multiple lines
359         unset($operatorsBefore['+'], $operatorsBefore['-'], $operatorsAfter['+'], $operatorsAfter['-']);
360         $content = preg_replace(
361             array(
362                 '/('.implode('|', $operatorsBefore).')\s+/',
363                 '/\s+('.implode('|', $operatorsAfter).')/',
364             ), '\\1', $content
365         );
367         // make sure + and - can't be mistaken for, or joined into ++ and --
368         $content = preg_replace(
369             array(
370                 '/(?<![\+\-])\s*([\+\-])(?![\+\-])/',
371                 '/(?<![\+\-])([\+\-])\s*(?![\+\-])/',
372             ), '\\1', $content
373         );
375         // collapse whitespace around reserved words into single space
376         $content = preg_replace('/(^|[;\}\s])\K('.implode('|', $keywordsBefore).')\s+/', '\\2 ', $content);
377         $content = preg_replace('/\s+('.implode('|', $keywordsAfter).')(?=([;\{\s]|$))/', ' \\1', $content);
379         /*
380          * We didn't strip whitespace after a couple of operators because they
381          * could be used in different contexts and we can't be sure it's ok to
382          * strip the newlines. However, we can safely strip any non-line feed
383          * whitespace that follows them.
384          */
385         $operatorsDiffBefore = array_diff($operators, $operatorsBefore);
386         $operatorsDiffAfter = array_diff($operators, $operatorsAfter);
387         $content = preg_replace('/('.implode('|', $operatorsDiffBefore).')[^\S\n]+/', '\\1', $content);
388         $content = preg_replace('/[^\S\n]+('.implode('|', $operatorsDiffAfter).')/', '\\1', $content);
390         /*
391          * Get rid of double semicolons, except where they can be used like:
392          * "for(v=1,_=b;;)", "for(v=1;;v++)" or "for(;;ja||(ja=true))".
393          * I'll safeguard these double semicolons inside for-loops by
394          * temporarily replacing them with an invalid condition: they won't have
395          * a double semicolon and will be easy to spot to restore afterwards.
396          */
397         $content = preg_replace('/\bfor\(([^;]*);;([^;]*)\)/', 'for(\\1;-;\\2)', $content);
398         $content = preg_replace('/;+/', ';', $content);
399         $content = preg_replace('/\bfor\(([^;]*);-;([^;]*)\)/', 'for(\\1;;\\2)', $content);
401         /*
402          * Next, we'll be removing all semicolons where ASI kicks in.
403          * for-loops however, can have an empty body (ending in only a
404          * semicolon), like: `for(i=1;i<3;i++);`, of `for(i in list);`
405          * Here, nothing happens during the loop; it's just used to keep
406          * increasing `i`. With that ; omitted, the next line would be expected
407          * to be the for-loop's body...
408          * I'm going to double that semicolon (if any) so after the next line,
409          * which strips semicolons here & there, we're still left with this one.
410          */
411         $content = preg_replace('/(for\([^;\{]*;[^;\{]*;[^;\{]*\));(\}|$)/s', '\\1;;\\2', $content);
412         $content = preg_replace('/(for\([^;\{]+\s+in\s+[^;\{]+\));(\}|$)/s', '\\1;;\\2', $content);
414         /*
415          * We also can't strip empty else-statements. Even though they're
416          * useless and probably shouldn't be in the code in the first place, we
417          * shouldn't be stripping the `;` that follows it as it breaks the code.
418          * We can just remove those useless else-statements completely.
419          *
420          * @see https://github.com/matthiasmullie/minify/issues/91
421          */
422         $content = preg_replace('/else;/s', '', $content);
424         /*
425          * We also don't really want to terminate statements followed by closing
426          * curly braces (which we've ignored completely up until now) or end-of-
427          * script: ASI will kick in here & we're all about minifying.
428          * Semicolons at beginning of the file don't make any sense either.
429          */
430         $content = preg_replace('/;(\}|$)/s', '\\1', $content);
431         $content = ltrim($content, ';');
433         // get rid of remaining whitespace af beginning/end
434         return trim($content);
435     }
437     /**
438      * We'll strip whitespace around certain operators with regular expressions.
439      * This will prepare the given array by escaping all characters.
440      *
441      * @param string[] $operators
442      * @param string   $delimiter
443      *
444      * @return string[]
445      */
446     protected function getOperatorsForRegex(array $operators, $delimiter = '/')
447     {
448         // escape operators for use in regex
449         $delimiters = array_fill(0, count($operators), $delimiter);
450         $escaped = array_map('preg_quote', $operators, $delimiters);
452         $operators = array_combine($operators, $escaped);
454         // ignore + & - for now, they'll get special treatment
455         unset($operators['+'], $operators['-']);
457         // dot can not just immediately follow a number; it can be confused for
458         // decimal point, or calling a method on it, e.g. 42 .toString()
459         $operators['.'] = '(?<![0-9]\s)\.';
461         // don't confuse = with other assignment shortcuts (e.g. +=)
462         $chars = preg_quote('+-*\=<>%&|', $delimiter);
463         $operators['='] = '(?<!['.$chars.'])\=';
465         return $operators;
466     }
468     /**
469      * We'll strip whitespace around certain keywords with regular expressions.
470      * This will prepare the given array by escaping all characters.
471      *
472      * @param string[] $keywords
473      * @param string   $delimiter
474      *
475      * @return string[]
476      */
477     protected function getKeywordsForRegex(array $keywords, $delimiter = '/')
478     {
479         // escape keywords for use in regex
480         $delimiter = array_fill(0, count($keywords), $delimiter);
481         $escaped = array_map('preg_quote', $keywords, $delimiter);
483         // add word boundaries
484         array_walk($keywords, function ($value) {
485             return '\b'.$value.'\b';
486         });
488         $keywords = array_combine($keywords, $escaped);
490         return $keywords;
491     }
493     /**
494      * Replaces all occurrences of array['key'] by array.key.
495      *
496      * @param string $content
497      *
498      * @return string
499      */
500     protected function propertyNotation($content)
501     {
502         // PHP only supports $this inside anonymous functions since 5.4
503         $minifier = $this;
504         $keywords = $this->keywordsReserved;
505         $callback = function ($match) use ($minifier, $keywords) {
506             $property = trim($minifier->extracted[$match[1]], '\'"');
508             /*
509              * Check if the property is a reserved keyword. In this context (as
510              * property of an object literal/array) it shouldn't matter, but IE8
511              * freaks out with "Expected identifier".
512              */
513             if (in_array($property, $keywords)) {
514                 return $match[0];
515             }
517             /*
518              * See if the property is in a variable-like format (e.g.
519              * array['key-here'] can't be replaced by array.key-here since '-'
520              * is not a valid character there.
521              */
522             if (!preg_match('/^'.$minifier::REGEX_VARIABLE.'$/u', $property)) {
523                 return $match[0];
524             }
526             return '.'.$property;
527         };
529         /*
530          * Figure out if previous character is a variable name (of the array
531          * we want to use property notation on) - this is to make sure
532          * standalone ['value'] arrays aren't confused for keys-of-an-array.
533          * We can (and only have to) check the last character, because PHP's
534          * regex implementation doesn't allow unfixed-length look-behind
535          * assertions.
536          */
537         preg_match('/(\[[^\]]+\])[^\]]*$/', static::REGEX_VARIABLE, $previousChar);
538         $previousChar = $previousChar[1];
540         /*
541          * Make sure word preceding the ['value'] is not a keyword, e.g.
542          * return['x']. Because -again- PHP's regex implementation doesn't allow
543          * unfixed-length look-behind assertions, I'm just going to do a lot of
544          * separate look-behind assertions, one for each keyword.
545          */
546         $keywords = $this->getKeywordsForRegex($keywords);
547         $keywords = '(?<!'.implode(')(?<!', $keywords).')';
549         return preg_replace_callback('/(?<='.$previousChar.'|\])'.$keywords.'\[\s*(([\'"])[0-9]+\\2)\s*\]/u', $callback, $content);
550     }
552     /**
553      * Replaces true & false by !0 and !1.
554      *
555      * @param string $content
556      *
557      * @return string
558      */
559     protected function shortenBools($content)
560     {
561         /*
562          * 'true' or 'false' could be used as property names (which may be
563          * followed by whitespace) - we must not replace those!
564          * Since PHP doesn't allow variable-length (to account for the
565          * whitespace) lookbehind assertions, I need to capture the leading
566          * character and check if it's a `.`
567          */
568         $callback = function ($match) {
569             if (trim($match[1]) === '.') {
570                 return $match[0];
571             }
573             return $match[1].($match[2] === 'true' ? '!0' : '!1');
574         };
575         $content = preg_replace_callback('/(^|.\s*)\b(true|false)\b(?!:)/', $callback, $content);
577         // for(;;) is exactly the same as while(true), but shorter :)
578         $content = preg_replace('/\bwhile\(!0\){/', 'for(;;){', $content);
580         // now make sure we didn't turn any do ... while(true) into do ... for(;;)
581         preg_match_all('/\bdo\b/', $content, $dos, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);
583         // go backward to make sure positional offsets aren't altered when $content changes
584         $dos = array_reverse($dos);
585         foreach ($dos as $do) {
586             $offsetDo = $do[0][1];
588             // find all `while` (now `for`) following `do`: one of those must be
589             // associated with the `do` and be turned back into `while`
590             preg_match_all('/\bfor\(;;\)/', $content, $whiles, PREG_OFFSET_CAPTURE | PREG_SET_ORDER, $offsetDo);
591             foreach ($whiles as $while) {
592                 $offsetWhile = $while[0][1];
594                 $open = substr_count($content, '{', $offsetDo, $offsetWhile - $offsetDo);
595                 $close = substr_count($content, '}', $offsetDo, $offsetWhile - $offsetDo);
596                 if ($open === $close) {
597                     // only restore `while` if amount of `{` and `}` are the same;
598                     // otherwise, that `for` isn't associated with this `do`
599                     $content = substr_replace($content, 'while(!0)', $offsetWhile, strlen('for(;;)'));
600                     break;
601                 }
602             }
603         }
605         return $content;
606     }