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