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171 lines
6.2 KiB
PHP
Executable File
171 lines
6.2 KiB
PHP
Executable File
<?php
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/**
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* Class Minify_YUI_CssCompressor
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* @package Minify
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*
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* YUI Compressor
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* Author: Julien Lecomte - http://www.julienlecomte.net/
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* Author: Isaac Schlueter - http://foohack.com/
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* Author: Stoyan Stefanov - http://phpied.com/
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* Author: Steve Clay - http://www.mrclay.org/ (PHP port)
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* Copyright (c) 2009 Yahoo! Inc. All rights reserved.
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* The copyrights embodied in the content of this file are licensed
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* by Yahoo! Inc. under the BSD (revised) open source license.
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*/
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/**
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* Compress CSS (incomplete DO NOT USE)
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*
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* @see https://github.com/yui/yuicompressor/blob/master/src/com/yahoo/platform/yui/compressor/CssCompressor.java
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*
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* @package Minify
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*/
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class Minify_YUI_CssCompressor {
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/**
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* Minify a CSS string
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*
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* @param string $css
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*
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* @return string
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*/
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public function compress($css, $linebreakpos = 0)
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{
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$css = str_replace("\r\n", "\n", $css);
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/**
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* @todo comment removal
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* @todo re-port from newer Java version
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*/
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// Normalize all whitespace strings to single spaces. Easier to work with that way.
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$css = preg_replace('@\s+@', ' ', $css);
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// Make a pseudo class for the Box Model Hack
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$css = preg_replace("@\"\\\\\"}\\\\\"\"@", "___PSEUDOCLASSBMH___", $css);
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// Remove the spaces before the things that should not have spaces before them.
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// But, be careful not to turn "p :link {...}" into "p:link{...}"
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// Swap out any pseudo-class colons with the token, and then swap back.
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$css = preg_replace_callback("@(^|\\})(([^\\{:])+:)+([^\\{]*\\{)@", array($this, '_removeSpacesCB'), $css);
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$css = preg_replace("@\\s+([!{};:>+\\(\\)\\],])@", "$1", $css);
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$css = str_replace("___PSEUDOCLASSCOLON___", ":", $css);
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// Remove the spaces after the things that should not have spaces after them.
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$css = preg_replace("@([!{}:;>+\\(\\[,])\\s+@", "$1", $css);
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// Add the semicolon where it's missing.
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$css = preg_replace("@([^;\\}])}@", "$1;}", $css);
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// Replace 0(px,em,%) with 0.
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$css = preg_replace("@([\\s:])(0)(px|em|%|in|cm|mm|pc|pt|ex)@", "$1$2", $css);
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// Replace 0 0 0 0; with 0.
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$css = str_replace(":0 0 0 0;", ":0;", $css);
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$css = str_replace(":0 0 0;", ":0;", $css);
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$css = str_replace(":0 0;", ":0;", $css);
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// Replace background-position:0; with background-position:0 0;
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$css = str_replace("background-position:0;", "background-position:0 0;", $css);
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// Replace 0.6 to .6, but only when preceded by : or a white-space
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$css = preg_replace("@(:|\\s)0+\\.(\\d+)@", "$1.$2", $css);
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// Shorten colors from rgb(51,102,153) to #336699
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// This makes it more likely that it'll get further compressed in the next step.
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$css = preg_replace_callback("@rgb\\s*\\(\\s*([0-9,\\s]+)\\s*\\)@", array($this, '_shortenRgbCB'), $css);
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// Shorten colors from #AABBCC to #ABC. Note that we want to make sure
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// the color is not preceded by either ", " or =. Indeed, the property
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// filter: chroma(color="#FFFFFF");
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// would become
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// filter: chroma(color="#FFF");
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// which makes the filter break in IE.
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$css = preg_replace_callback("@([^\"'=\\s])(\\s*)#([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])@", array($this, '_shortenHexCB'), $css);
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// Remove empty rules.
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$css = preg_replace("@[^\\}]+\\{;\\}@", "", $css);
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$linebreakpos = isset($this->_options['linebreakpos'])
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? $this->_options['linebreakpos']
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: 0;
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if ($linebreakpos > 0) {
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// Some source control tools don't like it when files containing lines longer
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// than, say 8000 characters, are checked in. The linebreak option is used in
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// that case to split long lines after a specific column.
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$i = 0;
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$linestartpos = 0;
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$sb = $css;
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// make sure strlen returns byte count
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$mbIntEnc = null;
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if (function_exists('mb_strlen') && ((int)ini_get('mbstring.func_overload') & 2)) {
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$mbIntEnc = mb_internal_encoding();
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mb_internal_encoding('8bit');
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}
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$sbLength = strlen($css);
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while ($i < $sbLength) {
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$c = $sb[$i++];
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if ($c === '}' && $i - $linestartpos > $linebreakpos) {
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$sb = substr_replace($sb, "\n", $i, 0);
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$sbLength++;
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$linestartpos = $i;
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}
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}
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$css = $sb;
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// undo potential mb_encoding change
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if ($mbIntEnc !== null) {
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mb_internal_encoding($mbIntEnc);
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}
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}
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// Replace the pseudo class for the Box Model Hack
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$css = str_replace("___PSEUDOCLASSBMH___", "\"\\\\\"}\\\\\"\"", $css);
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// Replace multiple semi-colons in a row by a single one
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// See SF bug #1980989
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$css = preg_replace("@;;+@", ";", $css);
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// prevent triggering IE6 bug: http://www.crankygeek.com/ie6pebug/
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$css = preg_replace('/:first-l(etter|ine)\\{/', ':first-l$1 {', $css);
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// Trim the final string (for any leading or trailing white spaces)
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$css = trim($css);
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return $css;
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}
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protected function _removeSpacesCB($m)
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{
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return str_replace(':', '___PSEUDOCLASSCOLON___', $m[0]);
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}
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protected function _shortenRgbCB($m)
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{
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$rgbcolors = explode(',', $m[1]);
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$hexcolor = '#';
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for ($i = 0; $i < count($rgbcolors); $i++) {
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$val = round($rgbcolors[$i]);
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if ($val < 16) {
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$hexcolor .= '0';
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}
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$hexcolor .= dechex($val);
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}
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return $hexcolor;
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}
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protected function _shortenHexCB($m)
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{
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// Test for AABBCC pattern
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if ((strtolower($m[3])===strtolower($m[4])) &&
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(strtolower($m[5])===strtolower($m[6])) &&
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(strtolower($m[7])===strtolower($m[8]))) {
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return $m[1] . $m[2] . "#" . $m[3] . $m[5] . $m[7];
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} else {
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return $m[0];
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}
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}
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} |