← All changes | classes/Optimization/CSSMinifier.php +43 -7 3.2 → 3.3 View file →

		@@ -6,14 +6,50 @@
6	6	defined( 'ABSPATH' ) || exit;
7	7
8	8	class CSSMinifier {
9	9
10		- public static function minify($css): string {
11		- $css = preg_replace('/\/\*(.*?)\*\//s', '', $css); // Remove comments
12		- $css = preg_replace('/\s+/', ' ', $css); // Remove whitespace
13		- $css = preg_replace('/;\s*/', ';', $css); // Remove spaces after semicolons
14		- $css = preg_replace('/: /', ':', $css); // Remove spaces after colons
15		- $css = preg_replace('/\s{2,}/', ' ', $css); // Remove multiple spaces
16		- return trim($css);
	10	+ public static function minify($input): string {
	11	+ if(trim($input) === "") {
	12	+ return $input;
	13	+ }
	14	+ $replaced = preg_replace(
	15	+ array(
	16	+ // Remove comment(s)
	17	+ '#("(?:[^"\\\]++|\\\.)*+"|\'(?:[^\'\\\\]++|\\\.)*+\')|\/\*(?!\!)(?>.*?\*\/)|^\s*|\s*$#s',
	18	+ // Remove unused white-space(s)
	19	+ '#("(?:[^"\\\]++|\\\.)*+"|\'(?:[^\'\\\\]++|\\\.)*+\'|\/\*(?>.*?\*\/))|\s*+;\s*+(})\s*+|\s*+([*$~^|]?+=|[{};,>~]|\s(?![0-9\.])|!important\b)\s*+|([[(:])\s++|\s++([])])|\s++(:)\s*+(?!(?>[^{}"\']++|"(?:[^"\\\]++|\\\.)*+"|\'(?:[^\'\\\\]++|\\\.)*+\')*+{)|^\s++|\s++\z|(\s)\s+#si',
	20	+ // Replace `0(cm|em|ex|in|mm|pc|pt|px|vh|vw|%)` with `0`
	21	+ '#(?<=[\s:])(0)(cm|em|ex|in|mm|pc|pt|px|vh|vw|%)#si',
	22	+ // Replace `:0 0 0 0` with `:0`
	23	+ '#:(0\s+0|0\s+0\s+0\s+0)(?=[;\}]|\!important)#i',
	24	+ // Replace `background-position:0` with `background-position:0 0`
	25	+ '#(background-position):0(?=[;\}])#si',
	26	+ // Replace `0.6` with `.6`, but only when preceded by `:`, `,`, `-` or a white-space
	27	+ '#(?<=[\s:,\-])0+\.(\d+)#s',
	28	+ // Minify string value
	29	+ '#(\/\*(?>.*?\*\/))|(?<!content\:)([\'"])([a-z_][a-z0-9\-_]*?)\2(?=[\s\{\}\];,])#si',
	30	+ '#(\/\*(?>.*?\*\/))|(\burl\()([\'"])([^\s]+?)\3(\))#si',
	31	+ // Minify HEX color code
	32	+ '#(?<=[\s:,\-]\#)([a-f0-6]+)\1([a-f0-6]+)\2([a-f0-6]+)\3#i',
	33	+ // Replace `(border|outline):none` with `(border|outline):0`
	34	+ '#(?<=[\{;])(border|outline):none(?=[;\}\!])#',
	35	+ // Remove empty selector(s)
	36	+ '#(\/\*(?>.*?\*\/))|(^|[\{\}])(?:[^\s\{\}]+)\{\}#s'
	37	+ ),
	38	+ array(
	39	+ '$1',
	40	+ '$1$2$3$4$5$6$7',
	41	+ '$1',
	42	+ ':0',
	43	+ '$1:0 0',
	44	+ '.$1',
	45	+ '$1$3',
	46	+ '$1$2$4$5',
	47	+ '$1$2$3',
	48	+ '$1:0',
	49	+ '$1$2'
	50	+ ),
	51	+ $input);
	52	+ return str_replace('fill=none', '', $replaced); // fix for url("data:image/svg+xml,%3Csvg ... fill='none'
17	53	}
18	54
19	55	}