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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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/** |
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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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* Note: This replaces a lot of spaces with line breaks. It's rumored |
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* (https://github.com/yui/yuicompressor/blob/master/README.md#global-options) |
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* that some source control tools and old browsers don't like very long lines. |
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* Compressed files with shorter lines are also easier to diff. If this is |
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* unacceptable please use CSSmin instead. |
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* |
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* @package Minify |
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* @author Stephen Clay <[email protected]> |
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* @author http://code.google.com/u/1stvamp/ (Issue 64 patch) |
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* |
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* @deprecated Use CSSmin (tubalmartin/cssmin) |
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*/ |
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class Minify_CSS_Compressor |
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{ |
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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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* @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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|
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return $obj->_process($css); |
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} |
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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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/** |
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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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/** |
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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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{ |
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$this->_options = $options; |
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} |
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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", $css); |
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|
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// preserve empty comment after '>' |
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// http://www.webdevout.net/css-hacks#in_css-selectors |
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$css = preg_replace('@>/\\*\\s*\\*/@', '>/*keep*/', $css); |
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|
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// preserve empty comment between property and value |
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// http://css-discuss.incutio.com/?page=BoxModelHack |
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$css = preg_replace('@/\\*\\s*\\*/\\s*:@', '/*keep*/:', $css); |
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$css = preg_replace('@:\\s*/\\*\\s*\\*/@', ':/*keep*/', $css); |
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|
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// apply callback to all valid comments (and strip out surrounding ws |
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$pattern = '@\\s*/\\*([\\s\\S]*?)\\*/\\s*@'; |
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$css = preg_replace_callback($pattern, array($this, '_commentCB'), $css); |
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|
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// remove ws around { } and last semicolon in declaration block |
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$css = preg_replace('/\\s*{\\s*/', '{', $css); |
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$css = preg_replace('/;?\\s*}\\s*/', '}', $css); |
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|
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// remove ws surrounding semicolons |
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$css = preg_replace('/\\s*;\\s*/', ';', $css); |
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|
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// remove ws around urls |
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$pattern = '/ |
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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'; |
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$css = preg_replace($pattern, 'url($1)', $css); |
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|
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// remove ws between rules and colons |
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$pattern = '/ |
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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'; |
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$css = preg_replace($pattern, '$1$2:$3', $css); |
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|
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// remove ws in selectors |
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$pattern = '/ |
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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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$css = preg_replace_callback($pattern, array($this, '_selectorsCB'), $css); |
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|
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// minimize hex colors |
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$pattern = '/([^=])#([a-f\\d])\\2([a-f\\d])\\3([a-f\\d])\\4([\\s;\\}])/i'; |
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$css = preg_replace($pattern, '$1#$2$3$4$5', $css); |
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|
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// remove spaces between font families |
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$pattern = '/font-family:([^;}]+)([;}])/'; |
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$css = preg_replace_callback($pattern, array($this, '_fontFamilyCB'), $css); |
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|
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$css = preg_replace('/@import\\s+url/', '@import url', $css); |
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|
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// replace any ws involving newlines with a single newline |
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$css = preg_replace('/[ \\t]*\\n+\\s*/', "\n", $css); |
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|
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// separate common descendent selectors w/ newlines (to limit line lengths) |
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$pattern = '/([\\w#\\.\\*]+)\\s+([\\w#\\.\\*]+){/'; |
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$css = preg_replace($pattern, "$1\n$2{", $css); |
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|
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// Use newline after 1st numeric value (to limit line lengths). |
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$pattern = '/ |
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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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$css = preg_replace($pattern, "$1\n", $css); |
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|
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// prevent triggering IE6 bug: http://www.crankygeek.com/ie6pebug/ |
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$css = preg_replace('/:first-l(etter|ine)\\{/', ':first-l$1 {', $css); |
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|
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return trim($css); |
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} |
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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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/** |
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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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|
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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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|
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if (preg_match('@";\\}\\s*\\}/\\*\\s+@', $m)) { |
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// component of http://tantek.com/CSS/Examples/midpass.html |
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return '/*";}}/* */'; |
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} |
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|
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if ($this->_inHack) { |
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// inversion: feeding only to one browser |
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$pattern = '@ |
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^/ # comment started like /*/ |
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\\s* |
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(\\S[\\s\\S]+?) # has at least some non-ws content |
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\\s* |
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/\\* # ends like /*/ or /**/ |
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@x'; |
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if (preg_match($pattern, $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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|
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return "/*/{$n[1]}/**/"; |
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} |
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} |
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|
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if (substr($m, -1) === '\\') { // comment ends like \*/ |
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// begin hack mode and preserve hack |
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$this->_inHack = true; |
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|
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return '/*\\*/'; |
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} |
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|
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if ($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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|
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return '/*/*/'; |
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} |
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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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|
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return '/**/'; |
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} |
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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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* 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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$flags = PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY; |
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$pieces = preg_split('/(\'[^\']+\'|"[^"]+")/', $m[1], -1, $flags); |
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$out = 'font-family:'; |
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|
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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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|
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return $out . $m[2]; |
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} |
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} |
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|
