250 lines
8.3 KiB
PHP
250 lines
8.3 KiB
PHP
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<?php
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/**
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* Class Minify_CSS_Compressor
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* @package Minify
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*/
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/**
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* Compress 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 tricky
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* hacks involving comment tokens in 'content' value strings to break
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* minimization badly. A test suite is available.
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*
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* @package Minify
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* @author Stephen Clay <steve@mrclay.org>
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* @author http://code.google.com/u/1stvamp/ (Issue 64 patch)
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*/
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class Minify_CSS_Compressor {
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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 $options (currently ignored)
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*
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* @return string
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*/
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public static function process($css, $options = array())
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{
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$obj = new Minify_CSS_Compressor($options);
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return $obj->_process($css);
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}
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/**
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* @var array
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*/
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protected $_options = null;
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/**
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* Are we "in" a hack? I.e. are some browsers targetted until the next comment?
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*
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* @var bool
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*/
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protected $_inHack = false;
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/**
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* Constructor
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*
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* @param array $options (currently ignored)
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*/
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private function __construct($options) {
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$this->_options = $options;
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}
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/**
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* Minify a CSS string
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*
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* @param string $css
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*
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* @return string
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*/
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protected function _process($css)
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{
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$css = str_replace("\r\n", "\n", $css);
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// preserve empty comment after '>'
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// http://www.webdevout.net/css-hacks#in_css-selectors
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$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*/', $css);
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// apply callback to all valid comments (and strip out surrounding ws
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$css = preg_replace_callback('@\\s*/\\*([\\s\\S]*?)\\*/\\s*@'
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,array($this, '_commentCB'), $css);
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// remove ws around { } and last semicolon in declaration block
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$css = preg_replace('/\\s*{\\s*/', '{', $css);
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$css = preg_replace('/;?\\s*}\\s*/', '}', $css);
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// remove ws surrounding semicolons
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$css = preg_replace('/\\s*;\\s*/', ';', $css);
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// remove ws around urls
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$css = preg_replace('/
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url\\( # url(
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\\s*
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([^\\)]+?) # 1 = the URL (really just a bunch of non right parenthesis)
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\\s*
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\\) # )
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/x', 'url($1)', $css);
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// remove ws between rules and colons
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$css = preg_replace('/
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\\s*
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([{;]) # 1 = beginning of block or rule separator
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\\s*
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([\\*_]?[\\w\\-]+) # 2 = property (and maybe IE filter)
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\\s*
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:
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\\s*
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(\\b|[#\'"-]) # 3 = first character of a value
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/x', '$1$2:$3', $css);
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// remove ws in selectors
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$css = preg_replace_callback('/
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(?: # non-capture
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\\s*
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[^~>+,\\s]+ # selector part
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\\s*
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[,>+~] # combinators
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)+
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\\s*
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[^~>+,\\s]+ # selector part
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{ # open declaration block
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/x'
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,array($this, '_selectorsCB'), $css);
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// minimize hex colors
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$css = preg_replace('/([^=])#([a-f\\d])\\2([a-f\\d])\\3([a-f\\d])\\4([\\s;\\}])/i'
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, '$1#$2$3$4$5', $css);
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// remove spaces between font families
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$css = preg_replace_callback('/font-family:([^;}]+)([;}])/'
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,array($this, '_fontFamilyCB'), $css);
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$css = preg_replace('/@import\\s+url/', '@import url', $css);
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// replace any ws involving newlines with a single newline
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$css = preg_replace('/[ \\t]*\\n+\\s*/', "\n", $css);
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// separate common descendent selectors w/ newlines (to limit line lengths)
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$css = preg_replace('/([\\w#\\.\\*]+)\\s+([\\w#\\.\\*]+){/', "$1\n$2{", $css);
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// Use newline after 1st numeric value (to limit line lengths).
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$css = preg_replace('/
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((?:padding|margin|border|outline):\\d+(?:px|em)?) # 1 = prop : 1st numeric value
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\\s+
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/x'
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,"$1\n", $css);
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// prevent triggering IE6 bug: http://www.crankygeek.com/ie6pebug/
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$css = preg_replace('/:first-l(etter|ine)\\{/', ':first-l$1 {', $css);
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return trim($css);
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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 $m regex matches
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*
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* @return string
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*/
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protected function _selectorsCB($m)
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{
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// remove ws around the combinators
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return preg_replace('/\\s*([,>+~])\\s*/', '$1', $m[0]);
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}
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/**
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* Process a comment and return a replacement
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*
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* @param array $m regex matches
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*
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* @return string
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*/
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protected function _commentCB($m)
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{
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$hasSurroundingWs = (trim($m[0]) !== $m[1]);
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$m = $m[1];
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// $m is the comment content w/o the surrounding tokens,
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// but the return value will replace the entire comment.
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if ($m === 'keep') {
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return '/**/';
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}
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if ($m === '" "') {
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// component of http://tantek.com/CSS/Examples/midpass.html
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return '/*" "*/';
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}
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if (preg_match('@";\\}\\s*\\}/\\*\\s+@', $m)) {
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// component of http://tantek.com/CSS/Examples/midpass.html
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return '/*";}}/* */';
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}
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if ($this->_inHack) {
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// inversion: feeding only to one browser
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if (preg_match('@
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^/ # comment started like /*/
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\\s*
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(\\S[\\s\\S]+?) # has at least some non-ws content
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\\s*
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/\\* # ends like /*/ or /**/
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@x', $m, $n)) {
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// end hack mode after this comment, but preserve the hack and comment content
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$this->_inHack = false;
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return "/*/{$n[1]}/**/";
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}
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}
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if (substr($m, -1) === '\\') { // comment ends like \*/
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// begin hack mode and preserve hack
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$this->_inHack = true;
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return '/*\\*/';
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}
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if ($m !== '' && $m[0] === '/') { // comment looks like /*/ foo */
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// begin hack mode and preserve hack
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$this->_inHack = true;
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return '/*/*/';
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}
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if ($this->_inHack) {
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// a regular comment ends hack mode but should be preserved
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$this->_inHack = false;
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return '/**/';
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}
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// Issue 107: if there's any surrounding whitespace, it may be important, so
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// replace the comment with a single space
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return $hasSurroundingWs // remove all other comments
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? ' '
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: '';
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}
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/**
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* Process a font-family listing and return a replacement
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*
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* @param array $m regex matches
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*
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* @return string
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*/
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protected function _fontFamilyCB($m)
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{
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// Issue 210: must not eliminate WS between words in unquoted families
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$pieces = preg_split('/(\'[^\']+\'|"[^"]+")/', $m[1], null, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
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$out = 'font-family:';
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while (null !== ($piece = array_shift($pieces))) {
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if ($piece[0] !== '"' && $piece[0] !== "'") {
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$piece = preg_replace('/\\s+/', ' ', $piece);
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$piece = preg_replace('/\\s?,\\s?/', ',', $piece);
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}
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$out .= $piece;
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}
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return $out . $m[2];
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}
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}
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