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<?php
namespace JchOptimize;
/**
* Class Minify_CSS
* @package Minify
*/
/**
* Compress CSS
*
* This is a heavy regex-based removal of whitespace, unnecessary
* comments and tokens, and some CSS value minimization, where practical.
* Many steps have been taken to avoid breaking comment-based hacks,
* including the ie5/mac filter (and its inversion), but expect tricky
* hacks involving comment tokens in 'content' value strings to break
* minimization badly. A test suite is available.
*
* @package Minify
* @author Stephen Clay <steve@mrclay.org>
* @author http://code.google.com/u/1stvamp/ (Issue 64 patch)
*/
class Minify_CSSi {
/**
* Minify a CSS string
*
* @param string $css
*
* @param array $options (currently ignored)
*
* @return string
*/
public static function process($css, $options = array())
{
$obj = new Minify_CSSi($options);
return $obj->_process($css);
}
/**
* @var array options
*/
protected $_options = null;
/**
* @var bool Are we "in" a hack?
*
* I.e. are some browsers targetted until the next comment?
*/
protected $_inHack = false;
/**
* Constructor
*
* @param array $options (currently ignored)
*
* @return null
*/
private function __construct($options) {
$this->_options = $options;
}
/**
* Minify a CSS string
*
* @param string $css
*
* @return string
*/
protected function _process($css)
{
$css = str_replace(array("\r\n","\r"), "\n", $css);
// preserve empty comment after '>'
// http://www.webdevout.net/css-hacks#in_css-selectors
$css = preg_replace('@>/\*\s*\*/@', '>/*keep*/', $css);
// preserve empty comment between property and value
// http://css-discuss.incutio.com/?page=BoxModelHack
$css = preg_replace('@/\*\s*\*/\s*:@', '/*keep*/:', $css);
$css = preg_replace('@:\s*/\*\s*\*/@', ':/*keep*/', $css);
//remove single line comments
//$css = preg_replace_callback('@url\([^)]++\)|//[^\n]*+@i'
// ,array($this, '_sl_commentCB'), $css);
// apply callback to all valid comments (and strip out surrounding ws
$css = preg_replace_callback('@\s*/\*((?>\*?[^*]*+)*?)\*/\s*@'
,array($this, '_commentCB'), $css);
// remove ws around { } and last semicolon in declaration block
$css = preg_replace('/\s*{\s*/', '{', $css);
$css = preg_replace('/;?\s*}\s*/', '}', $css);
// remove ws surrounding semicolons & commas
$css = preg_replace(array('/\s*;\s*/','/\s*,\s*/'), array(';', ','), $css);
// remove ws around urls
$css = preg_replace('/
url\( # url(
\s*
([^\)]++) # 1 = the URL (really just a bunch of non right parenthesis)
\s*
\) # )
/x', 'url($1)', $css);
// remove ws between rules and colons
$css = preg_replace('/
\s*
([{;]) # 1 = beginning of block or rule separator
\s*
([\*_]?[\w\-]+) # 2 = property (and maybe IE filter)
\s*
:
\s*
(\b|[#\'"]) # 3 = first character of a value
/x', '$1$2:$3', $css);
// remove ws in selectors
$css = preg_replace_callback('/
(?:^|[{}])\K
(?= [^>+~{]*+ [>+~])
[^{}]*+ {
/x'
,array($this, '_selectorsCB'), $css);
// minimize hex colors
$css = preg_replace('/([^=])#([a-f\d])\2([a-f\d])\3([a-f\d])\4([\s;\}])/i'
, '$1#$2$3$4$5', $css);
// remove spaces between font families
$css = preg_replace_callback('/font-family:([^;}]+)([;}])/'
,array($this, '_fontFamilyCB'), $css);
$css = preg_replace('/@import\s+url/', '@import url', $css);
// replace any ws involving newlines with a single newline
//$css = preg_replace('/[ \\t]*\\n+\\s*/', "\n", $css);
// separate common descendent selectors w/ newlines (to limit line lengths)
//$css = preg_replace('/([\\w#\\.\\*]+)\\s+([\\w#\\.\\*]+){/', "$1\n$2{", $css);
// Use newline after 1st numeric value (to limit line lengths).
/* $css = preg_replace('/
((?:padding|margin|border|outline):\\d+(?:px|em)?) # 1 = prop : 1st numeric value
\\s+
/x'
,"$1\n", $css);*/
// prevent triggering IE6 bug: http://www.crankygeek.com/ie6pebug/
//$css = preg_replace('/:first-l(etter|ine)\\{/', ':first-l$1 {', $css);
return trim($css);
}
/**
* Replace what looks like a set of selectors
*
* @param array $m regex matches
*
* @return string
*/
protected function _selectorsCB($m)
{
// remove ws around the combinators
return preg_replace('/\s*([,>+~])\s*/', '$1', $m[0]);
}
/**
* Process a comment and return a replacement
*
* @param array $m regex matches
*
* @return string
*/
protected function _commentCB($m)
{
$hasSurroundingWs = (trim($m[0]) !== $m[1]);
$m = $m[1];
// $m is the comment content w/o the surrounding tokens,
// but the return value will replace the entire comment.
if ($m === 'keep') {
return '/**/';
}
if ($m === '" "') {
// component of http://tantek.com/CSS/Examples/midpass.html
return '/*" "*/';
}
if (preg_match('@";\}\s*\}/\*\s+@', $m)) {
// component of http://tantek.com/CSS/Examples/midpass.html
return '/*";}}/* */';
}
if ($this->_inHack) {
// inversion: feeding only to one browser
if (preg_match('@
^/ # comment started like /*/
\s*
(\S[\s\S]+?) # has at least some non-ws content
\s*
/\* # ends like /*/ or /**/
@x', $m, $n)) {
// end hack mode after this comment, but preserve the hack and comment content
$this->_inHack = false;
return "/*/{$n[1]}/**/";
}
}
if (substr($m, -1) === '\\') { // comment ends like \*/
// begin hack mode and preserve hack
$this->_inHack = true;
return '/*\\*/';
}
if ($m !== '' && $m[0] === '/') { // comment looks like /*/ foo */
// begin hack mode and preserve hack
$this->_inHack = true;
return '/*/*/';
}
if ($this->_inHack) {
// a regular comment ends hack mode but should be preserved
$this->_inHack = false;
return '/**/';
}
// Issue 107: if there's any surrounding whitespace, it may be important, so
// replace the comment with a single space
return $hasSurroundingWs // remove all other comments
? ' '
: '';
}
protected function _sl_commentCB($m)
{
if(preg_match('@^url@', $m[0]))
{
return $m[0];
}
else
{
return '';
}
}
/**
* Process a font-family listing and return a replacement
*
* @param array $m regex matches
*
* @return string
*/
protected function _fontFamilyCB($m)
{
$m[1] = preg_replace('/\s*,\s*/', ',' , $m[1]);
$m[1] = preg_replace('/\s*(\S*(?>\s*\S*)*)\s*/', '$1', $m[1]);
return 'font-family:' . $m[1] . $m[2];
}
}