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V1.9.0 overhaul
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Steve Clay
180
lib/Minify/CSS.php
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180
lib/Minify/CSS.php
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<?php
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/**
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* "Minify" CSS
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*
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* This is a heavy regex-based removal of whitespace, unnecessary
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* comments and tokens, and some CSS value minimization, where practical.
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* Many steps have been taken to avoid breaking comment-based hacks,
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* including the ie5/mac filter (and its inversion), but expect hacks
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* involving comment tokens in 'content' value strings to break minimization
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* badly. A test suite is available
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*/
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class Minify_CSS {
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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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* @param array $options optional. To enable URL rewriting, set the value
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* for key 'prependRelativePath'.
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*
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* @return string
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*/
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public static function minify($css, $options = array()) {
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// preserve empty comment after '>'
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// http://www.webdevout.net/css-hacks#in_css-selectors
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$css = preg_replace('/>\\/\\*\\s*\\*\\//', '>/*keep*/', $css);
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// preserve empty comment between property and value
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// http://css-discuss.incutio.com/?page=BoxModelHack
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$css = preg_replace('/\\/\\*\\s*\\*\\/\\s*:/', '/*keep*/:', $css);
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$css = preg_replace('/:\\s*\\/\\*\\s*\\*\\//', ':/*keep*/', $css);
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// apply callback to all valid comments (and strip out surrounding ws
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self::$_inHack = false;
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$css = preg_replace_callback('/\\s*\\/\\*([\\s\\S]*?)\\*\\/\\s*/'
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,array('Minify_CSS', '_commentCB'), $css);
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// compress whitespace. Yes, this will affect "copyright" comments.
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$css = preg_replace('/\s+/', ' ', $css);
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// leave needed comments
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$css = str_replace('/*keep*/', '/**/', $css);
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// remove ws around { }
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$css = preg_replace('/\\s*{\\s*/', '{', $css);
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$css = preg_replace('/;?\\s*}\\s*/', '}', $css);
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// remove ws between rules
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$css = preg_replace('/\\s*;\\s*/', ';', $css);
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// remove ws around urls
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$css = preg_replace('/url\\([\\s]*([^\\)]+?)[\\s]*\\)/', 'url($1)', $css);
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// remove ws between rules and colons
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$css = preg_replace('/\\s*([{;])\\s*([\\w\\-]+)\\s*:\\s*\\b/', '$1$2:', $css);
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// remove ws in selectors
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$css = preg_replace_callback('/(?:\\s*[^~>+,\\s]+\\s*[,>+~])+\\s*[^~>+,\\s]+{/'
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,array('Minify_CSS', '_selectorsCB'), $css);
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// minimize hex colors
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$css = preg_replace('/#([a-f\\d])\\1([a-f\\d])\\2([a-f\\d])\\3([\\s;\\}])/i'
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, '#$1$2$3$4', $css);
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if (isset($options['prependRelativePath'])) {
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self::$_tempPrepend = $options['prependRelativePath'];
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$css = preg_replace_callback('/@import ([\'"])(.*?)[\'"]\\s*;/'
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,array('Minify_CSS', '_urlCB'), $css);
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$css = preg_replace_callback('/url\\(([^\\)]+)\\)/'
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,array('Minify_CSS', '_urlCB'), $css);
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}
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return trim($css);
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}
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/**
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* @var bool Are we "in" a hack?
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*
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* I.e. are some browsers targetted until the next comment?
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*/
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private static $_inHack = false;
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/**
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* @var string string to be prepended to relative URIs
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*/
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private static $_tempPrepend = '';
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/**
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* Process what looks like a comment and return a replacement
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*
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* @param array $m regex matches
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*
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* @return string
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*/
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private static function _commentCB($m)
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{
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$m = $m[1];
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// $m is everything after the opening tokens and before the closing tokens
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// but return will replace the entire comment.
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if ($m === 'keep') {
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return '/*keep*/';
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}
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if (false !== strpos($m, 'copyright')) {
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// contains copyright, preserve
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self::$_inHack = false;
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return "/*{$m}*/";
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}
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if (self::$_inHack) {
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// inversion: feeding only to one browser
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if (preg_match('/^\\/\\s*(\\S[\\s\\S]+?)\\s*\\/\\*/', $m, $n)) {
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self::$_inHack = false;
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return "/*/{$n[1]}/*keep*/";
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}
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}
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if (substr($m, -1) === '\\') {
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self::$_inHack = true;
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return '/*\\*/';
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}
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if (substr($m, 0, 1) === '/') {
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self::$_inHack = true;
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return '/*/*/';
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}
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if (self::$_inHack) {
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self::$_inHack = false;
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return '/*keep*/';
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}
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return '';
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}
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/**
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* Replace what looks like a set of selectors
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*
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* @param array $m regex matches
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*
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* @return string
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*/
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private static function _selectorsCB($m)
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{
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return preg_replace('/\\s*([,>+~])\\s*/', '$1', $m[0]);
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}
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private static function _urlCB($m)
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{
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$isImport = (0 === strpos($m[0], '@import'));
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if ($isImport) {
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$quote = $m[1];
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$url = $m[2];
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} else {
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// $m[1] is surrounded by quotes or not
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$quote = ($m[1][0] === '\'' || $m[1][0] === '"')
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? $m[1][0]
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: '';
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$url = ($quote === '')
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? $m[1]
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: substr($m[1], 1, strlen($m[1]) - 2);
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}
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if ('/' === $url[0]) {
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if ('/' === $url[1]) {
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// protocol relative URI!
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$url = '//' . self::$_tempPrepend . substr($url, 2);
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}
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} else {
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if (strpos($url, '//') > 0) {
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// probably starts with protocol, do not alter
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} else {
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// relative URI
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$url = self::$_tempPrepend . $url;
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}
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}
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if ($isImport) {
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return "@import {$quote}{$url}{$quote};";
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} else {
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return "url({$quote}{$url}{$quote})";
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}
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}
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}
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