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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 CSS_Optimize extends Optimize
{
const URI = '(?<=url)\([^)]*+\)';
/**
* Minify a CSS string
*
* @param string $css
*
* @param array $options (currently ignored)
*
* @return string
*/
public static function optimize($css, $options = array())
{
$obj = new CSS_Optimize($options);
return $obj->_optimize($css);
}
/**
* Constructor
*
* @param array $options (currently ignored)
*
* @return null
*/
private function __construct($options)
{
foreach ($options as $key => $value)
{
$this->{'_' . $key} = $value;
}
}
/**
* Minify a CSS string
*
* @param string $css
*
* @return string
*/
private function _optimize($css)
{
$s1 = self::DOUBLE_QUOTE_STRING;
$s2 = self::SINGLE_QUOTE_STRING;
$es = $s1 . '|' . $s2;
$s = '(?<!\\\\)(?:' . $es . ')|[\'"]';
$u = self::URI;
$e = '(?<!\\\\)(?:' . $es . '|' . $u . ')|[\'"(]';
// Remove all comments
$rx = "#(?>/?[^/\"'(]*+(?:$e)?)*?\K(?>/\*(?:\*?[^*]*+)*?\*/|//[^\r\n]*+|$)#s";
$css = $this->_replace($rx, '', $css, '1');
// remove ws around , ; : { } in CSS Declarations and media queries
$rx = "#(?>(?:[{};]|^)[^{}@;]*+{|(?:(?<![,;:{}])\s++(?![,;:{}]))?[^\s{};\"'(]*+(?:$e|[{};])?)+?\K"
. "(?:\s++(?=[,;:{}])|(?<=[,;:{}])\s++|\K$)#s";
$css = $this->_replace($rx, '', $css, '2');
//remove ws around , + > ~ { } in selectors
$rx = "#(?>(?:(?<![,+>~{}])\s++(?![,+>~{}]))?[^\s{\"'(]*+(?:{[^{}]++}|{|$e)?)*?\K"
. "(?:\s++(?=[,+>~{}])|(?<=[,+>~{};])\s++|$\K)#s";
$css = $this->_replace($rx, '', $css, '3');
//remove last ; in block
$rx = "#(?>(?:;(?!}))?[^;\"'(]*+(?:$e)?)*?\K(?:;(?=})|$\K)#s";
$css = $this->_replace($rx, '', $css, '4');
// remove ws inside urls
$rx = "#(?>\(?[^\"'(]*+(?:$s)?)*?(?:(?<=\burl)\(\K\s++|\G"
. "(?(?=[\"'])['\"][^'\"]++['\"]|[^\s]++)\K\s++(?=\))|$\K)#s";
$css = $this->_replace($rx, '', $css, '5');
// minimize hex colors
$rx = "/(?>\#?[^\#\"'(]*+(?:$e)?)*?(?:(?<!=)\#\K"
. "([a-f\d])\g{1}([a-f\d])\g{2}([a-f\d])\g{3}(?=[\s;}])|$\K)/is";
$css = $this->_replace($rx, '$1$2$3', $css, '6');
// reduce remaining ws to single space
$rx = "#(?>[^\s'\"(]*+(?:$e|\s(?!\s))?)*?\K(?:\s\s++|$)#s";
$css = $this->_replace($rx, ' ', $css, '7');
return trim($css);
}
}