250 lines
8.1 KiB
PHP
250 lines
8.1 KiB
PHP
<?php
|
|
/**
|
|
* Class Minify_CSS_Compressor
|
|
* @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_CSS_Compressor {
|
|
|
|
/**
|
|
* Minify a CSS string
|
|
*
|
|
* @param string $css
|
|
*
|
|
* @param array $options (currently ignored)
|
|
*
|
|
* @return string
|
|
*/
|
|
public static function process($css, $options = array())
|
|
{
|
|
$obj = new Minify_CSS_Compressor($options);
|
|
return $obj->_process($css);
|
|
}
|
|
|
|
/**
|
|
* @var array
|
|
*/
|
|
protected $_options = null;
|
|
|
|
/**
|
|
* Are we "in" a hack? I.e. are some browsers targetted until the next comment?
|
|
*
|
|
* @var bool
|
|
*/
|
|
protected $_inHack = false;
|
|
|
|
|
|
/**
|
|
* Constructor
|
|
*
|
|
* @param array $options (currently ignored)
|
|
*/
|
|
private function __construct($options) {
|
|
$this->_options = $options;
|
|
}
|
|
|
|
/**
|
|
* Minify a CSS string
|
|
*
|
|
* @param string $css
|
|
*
|
|
* @return string
|
|
*/
|
|
protected function _process($css)
|
|
{
|
|
$css = str_replace("\r\n", "\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);
|
|
|
|
// apply callback to all valid comments (and strip out surrounding ws
|
|
$css = preg_replace_callback('@\\s*/\\*([\\s\\S]*?)\\*/\\s*@'
|
|
,array($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
|
|
$css = preg_replace('/\\s*;\\s*/', ';', $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
|
|
$css = preg_replace_callback('/
|
|
(?: # non-capture
|
|
\\s*
|
|
[^~>+,\\s]+ # selector part
|
|
\\s*
|
|
[,>+~] # combinators
|
|
)+
|
|
\\s*
|
|
[^~>+,\\s]+ # selector part
|
|
{ # open declaration block
|
|
/x'
|
|
,array($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
|
|
? ' '
|
|
: '';
|
|
}
|
|
|
|
/**
|
|
* Process a font-family listing and return a replacement
|
|
*
|
|
* @param array $m regex matches
|
|
*
|
|
* @return string
|
|
*/
|
|
protected function _fontFamilyCB($m)
|
|
{
|
|
// Issue 210: must not eliminate WS between words in unquoted families
|
|
$pieces = preg_split('/(\'[^\']+\'|"[^"]+")/', $m[1], null, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY);
|
|
$out = 'font-family:';
|
|
while (null !== ($piece = array_shift($pieces))) {
|
|
if ($piece[0] !== '"' && $piece[0] !== "'") {
|
|
$piece = preg_replace('/\\s+/', ' ', $piece);
|
|
$piece = preg_replace('/\\s?,\\s?/', ',', $piece);
|
|
}
|
|
$out .= $piece;
|
|
}
|
|
return $out . $m[2];
|
|
}
|
|
}
|