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<?php |
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|
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namespace WPCoder\Optimization; |
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|
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// Exit if accessed directly. |
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defined( 'ABSPATH' ) || exit; |
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|
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class CSSMinifier { |
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|
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public static function minify($input): string { |
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if(trim($input) === "") { |
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return $input; |
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} |
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$replaced = preg_replace( |
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array( |
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// Remove comment(s) |
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'#("(?:[^"\\\]++|\\\.)*+"|\'(?:[^\'\\\\]++|\\\.)*+\')|\/\*(?!\!)(?>.*?\*\/)|^\s*|\s*$#s', |
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// Remove unused white-space(s) |
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'#("(?:[^"\\\]++|\\\.)*+"|\'(?:[^\'\\\\]++|\\\.)*+\'|\/\*(?>.*?\*\/))|\s*+;\s*+(})\s*+|\s*+([*$~^|]?+=|[{};,>~]|\s(?![0-9\.])|!important\b)\s*+|([[(:])\s++|\s++([])])|\s++(:)\s*+(?!(?>[^{}"\']++|"(?:[^"\\\]++|\\\.)*+"|\'(?:[^\'\\\\]++|\\\.)*+\')*+{)|^\s++|\s++\z|(\s)\s+#si', |
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// Replace `0(cm|em|ex|in|mm|pc|pt|px|vh|vw|%)` with `0` |
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'#(?<=[\s:])(0)(cm|em|ex|in|mm|pc|pt|px|vh|vw|%)#si', |
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// Replace `:0 0 0 0` with `:0` |
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'#:(0\s+0|0\s+0\s+0\s+0)(?=[;\}]|\!important)#i', |
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// Replace `background-position:0` with `background-position:0 0` |
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'#(background-position):0(?=[;\}])#si', |
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// Replace `0.6` with `.6`, but only when preceded by `:`, `,`, `-` or a white-space |
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'#(?<=[\s:,\-])0+\.(\d+)#s', |
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// Minify string value |
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'#(\/\*(?>.*?\*\/))|(?<!content\:)([\'"])([a-z_][a-z0-9\-_]*?)\2(?=[\s\{\}\];,])#si', |
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'#(\/\*(?>.*?\*\/))|(\burl\()([\'"])([^\s]+?)\3(\))#si', |
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// Minify HEX color code |
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'#(?<=[\s:,\-]\#)([a-f0-6]+)\1([a-f0-6]+)\2([a-f0-6]+)\3#i', |
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// Replace `(border|outline):none` with `(border|outline):0` |
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'#(?<=[\{;])(border|outline):none(?=[;\}\!])#', |
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// Remove empty selector(s) |
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'#(\/\*(?>.*?\*\/))|(^|[\{\}])(?:[^\s\{\}]+)\{\}#s' |
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), |
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array( |
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'$1', |
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'$1$2$3$4$5$6$7', |
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'$1', |
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':0', |
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'$1:0 0', |
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'.$1', |
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'$1$3', |
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'$1$2$4$5', |
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'$1$2$3', |
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'$1:0', |
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'$1$2' |
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), |
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$input); |
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return str_replace('fill=none', '', $replaced); // fix for url("data:image/svg+xml,%3Csvg ... fill='none' |
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} |
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|
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} |
