File "CSSMin.class.php"
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<?php
class Swift_Performance_CSSMin {
public static function minify($css){
if (Swift_Performance::check_option('minify-css', 1)){
return self::basic($css);
}
else if (Swift_Performance::check_option('minify-css', 2)){
return self::full($css);
}
return $css;
}
/**
* Basic optimization
* @param string $css
* @return string
*/
public static function basic($css){
$css = preg_replace('~/\*.*?\*/~s', '', $css);
$css = preg_replace('~\r?\n~', ' ', $css);
$css = preg_replace('~(\s{2}|\t)~', ' ', $css);
return $css;
}
/**
* Full optimization
* @param string $css
* @return string
*/
public static function full($css){
// Encode content attribute for pseudo elements before minify
$css = preg_replace_callback('~content\s?:\s?(\'|")([^\'"]*)(\'|")~', function($matches){
return 'content: ' . $matches[1] . base64_encode($matches[2]) . $matches[1];
}, $css);
$css = self::strip_comments($css);
$css = self::strip_whitespace($css);
$css = self::shorten_hex($css);
$css = self::shorten_zeroes($css);
$css = self::shorten_font_weights($css);
$css = self::strip_empty_tags($css);
// Decode content attribute for pseudo elements after minify
$css = preg_replace_callback('~content\s?:\s?(\'|")([^\'"]*)(\'|")~', function($matches){
return 'content: ' . $matches[1] . base64_decode($matches[2]) . $matches[1];
}, $css);
return $css;
}
/**
* Strip comments
* @param string $content
* @return string
*/
public static function strip_comments($content){
return preg_replace('~/\*.*?\*/~s', '', $content);
}
/**
* Strip whitespace.
* Thanks for Matthias Mullie (https://github.com/matthiasmullie)
* @param string $content The CSS content to strip the whitespace for
* @return string
*/
public static function strip_whitespace($content){
// remove leading & trailing whitespace
$content = preg_replace('/^\s*/m', '', $content);
$content = preg_replace('/\s*$/m', '', $content);
// replace newlines with a single space
$content = preg_replace('/\s+/', ' ', $content);
// remove whitespace around meta characters
// inspired by stackoverflow.com/questions/15195750/minify-compress-css-with-regex
$content = preg_replace('/\s*([\*$~^|]?+=|[{};,>~]|!important\b)\s*/', '$1', $content);
$content = preg_replace('/([\[(:])\s+/', '$1', $content);
$content = preg_replace('/\s+([\]\)])/', '$1', $content);
$content = preg_replace('/\s+(:)(?![^\}]*\{)/', '$1', $content);
// whitespace around + and - can only be stripped inside some pseudo-
// classes, like `:nth-child(3+2n)`
// not in things like `calc(3px + 2px)`, shorthands like `3px -2px`, or
// selectors like `div.weird- p`
$pseudos = array('nth-child', 'nth-last-child', 'nth-last-of-type', 'nth-of-type');
$content = preg_replace('/:('.implode('|', $pseudos).')\(\s*([+-]?)\s*(.+?)\s*([+-]?)\s*(.*?)\s*\)/', ':$1($2$3$4$5)', $content);
// remove semicolon/whitespace followed by closing bracket
$content = str_replace(';}', '}', $content);
return trim($content);
}
/**
* Shorthand hex color codes.
* Thanks for Matthias Mullie (https://github.com/matthiasmullie)
* @param string $content The CSS content to shorten the hex color codes for
* @return string
*/
public static function shorten_hex($content){
$content = preg_replace('/(?<=[: ])#([0-9a-z])\\1([0-9a-z])\\2([0-9a-z])\\3(?=[; }])/i', '#$1$2$3', $content);
// we can shorten some even more by replacing them with their color name
$colors = array(
'#F0FFFF' => 'azure',
'#F5F5DC' => 'beige',
'#A52A2A' => 'brown',
'#FF7F50' => 'coral',
'#FFD700' => 'gold',
'#808080' => 'gray',
'#008000' => 'green',
'#4B0082' => 'indigo',
'#FFFFF0' => 'ivory',
'#F0E68C' => 'khaki',
'#FAF0E6' => 'linen',
'#800000' => 'maroon',
'#000080' => 'navy',
'#808000' => 'olive',
'#CD853F' => 'peru',
'#FFC0CB' => 'pink',
'#DDA0DD' => 'plum',
'#800080' => 'purple',
'#F00' => 'red',
'#FA8072' => 'salmon',
'#A0522D' => 'sienna',
'#C0C0C0' => 'silver',
'#FFFAFA' => 'snow',
'#D2B48C' => 'tan',
'#FF6347' => 'tomato',
'#EE82EE' => 'violet',
'#F5DEB3' => 'wheat',
);
return preg_replace_callback(
'/(?<=[: ])('.implode(array_keys($colors), '|').')(?=[; }])/i',
function ($match) use ($colors) {
return $colors[strtoupper($match[0])];
},
$content
);
}
/**
* Shorthand 0 values to plain 0, instead of e.g. -0em.
* Thanks for Matthias Mullie (https://github.com/matthiasmullie)
* @param string $content The CSS content to shorten the zero values for
* @return string
*/
public static function shorten_zeroes($content){
// we don't want to strip units in `calc()` expressions:
// `5px - 0px` is valid, but `5px - 0` is not
// `10px * 0` is valid (equates to 0), and so is `10 * 0px`, but
// `10 * 0` is invalid
// best to just leave `calc()`s alone, even if they could be optimized
// (which is a whole other undertaking, where units & order of
// operations all need to be considered...)
$calcs = self::find_calcs($content);
$content = str_replace($calcs, array_keys($calcs), $content);
// reusable bits of code throughout these regexes:
// before & after are used to make sure we don't match lose unintended
// 0-like values (e.g. in #000, or in http://url/1.0)
// units can be stripped from 0 values, or used to recognize non 0
// values (where wa may be able to strip a .0 suffix)
$before = '(?<=[:(, ])';
$after = '(?=[ ,);}])';
$units = '(em|ex|%|px|cm|mm|in|pt|pc|ch|rem|vh|vw|vmin|vmax|vm)';
// strip units after zeroes (0px -> 0)
// NOTE: it should be safe to remove all units for a 0 value, but in
// practice, Webkit (especially Safari) seems to stumble over at least
// 0%, potentially other units as well. Only stripping 'px' for now.
// @see https://github.com/matthiasmullie/minify/issues/60
$content = preg_replace('/'.$before.'(-?0*(\.0+)?)(?<=0)px'.$after.'/', '\\1', $content);
// strip 0-digits (.0 -> 0)
$content = preg_replace('/'.$before.'\.0+'.$units.'?'.$after.'/', '0\\1', $content);
// strip trailing 0: 50.10 -> 50.1, 50.10px -> 50.1px
$content = preg_replace('/'.$before.'(-?[0-9]+\.[0-9]+)0+'.$units.'?'.$after.'/', '\\1\\2', $content);
// strip trailing 0: 50.00 -> 50, 50.00px -> 50px
$content = preg_replace('/'.$before.'(-?[0-9]+)\.0+'.$units.'?'.$after.'/', '\\1\\2', $content);
// strip leading 0: 0.1 -> .1, 01.1 -> 1.1
$content = preg_replace('/'.$before.'(-?)0+([0-9]*\.[0-9]+)'.$units.'?'.$after.'/', '\\1\\2\\3', $content);
// strip negative zeroes (-0 -> 0) & truncate zeroes (00 -> 0)
$content = preg_replace('/'.$before.'-?0+'.$units.'?'.$after.'/', '0\\1', $content);
// IE doesn't seem to understand a unitless flex-basis value (correct -
// it goes against the spec), so let's add it in again (make it `%`,
// which is only 1 char: 0%, 0px, 0 anything, it's all just the same)
// @see https://developer.mozilla.org/nl/docs/Web/CSS/flex
$content = preg_replace('/flex:([0-9]+\s[0-9]+\s)0([;\}])/', 'flex:${1}0%${2}', $content);
$content = preg_replace('/flex-basis:0([;\}])/', 'flex-basis:0%${1}', $content);
// restore `calc()` expressions
$content = str_replace(array_keys($calcs), $calcs, $content);
return $content;
}
/**
* Shorten CSS font weights.
* Thanks for Matthias Mullie (https://github.com/matthiasmullie)
* @param string $content The CSS content to shorten the font weights for
* @return string
*/
public static function shorten_font_weights($content){
$weights = array(
'normal' => 400,
'bold' => 700,
);
return preg_replace_callback('/(font-weight\s*:\s*)('.implode('|', array_keys($weights)).')(?=[;}])/', function ($match) use ($weights) {
return $match[1].$weights[$match[2]];
}, $content);
}
/**
* Strip empty tags from source code.
* Thanks for Matthias Mullie (https://github.com/matthiasmullie)
* @param string $content
* @return string
*/
public static function strip_empty_tags($content){
$content = preg_replace('/(?<=^)[^\{\};]+\{\s*\}/', '', $content);
$content = preg_replace('/(?<=(\}|;))[^\{\};]+\{\s*\}/', '', $content);
return $content;
}
/**
* Find all `calc()` occurrences.
* Thanks for Matthias Mullie (https://github.com/matthiasmullie)
* @param string $content The CSS content to find `calc()`s in.
* @return array
*/
public static function find_calcs($content){
$results = array();
preg_match_all('/calc(\(.+?)(?=$|;|calc\()/', $content, $matches, PREG_SET_ORDER);
foreach ($matches as $match) {
$length = strlen($match[1]);
$expr = '';
$opened = 0;
for ($i = 0; $i < $length; $i++) {
$char = $match[1][$i];
$expr .= $char;
if ($char === '(') {
$opened++;
} elseif ($char === ')' && --$opened === 0) {
break;
}
}
$results['calc('.count($results).')'] = 'calc'.$expr;
}
return $results;
}
}
?>