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<?php |
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namespace gulch\Minify\Processor; |
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use gulch\Minify\Contract\ProcessorInterface; |
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class InlineCssMinifier implements ProcessorInterface |
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{ |
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public function process(string $buffer): string |
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{ |
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if (\strlen($buffer) === 0) { |
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return ''; |
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} |
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$css_minified = []; |
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\preg_match_all('{<style.+</style>}msU', $buffer, $style_blocks); |
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// Minify the javascript in <script> tags. |
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foreach ($style_blocks[0] as $block) { |
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$css_minified[] = $this->minifyCss($block); |
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} |
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if (\sizeof($css_minified)) { |
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$buffer = \str_replace($style_blocks[0], $css_minified, $buffer); |
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} |
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return $buffer; |
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} |
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private function minifyCss(string $buffer): string |
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{ |
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$tags = ['close' => \strrchr($buffer, '<')]; |
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$open_length = \strpos($buffer, '>') + 1; |
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$tags['open'] = \substr($buffer, 0, $open_length); |
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$buffer = \substr($buffer, $open_length, -\strlen($tags['close'])); |
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// Strip spaces from the tags |
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$tags = \preg_replace('/\s{2,}/', ' ', $tags); |
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// Standartize new lines |
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$buffer = \str_replace(["\r\n", "\r"], "\n", $buffer); |
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$patterns = [ |
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// Remove comment(s) |
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'#("(?:[^"\\\]++|\\\.)*+"|\'(?:[^\'\\\\]++|\\\.)*+\')|\/\*(?!\!)(?>.*?\*\/)|^\s*|\s*$#s' => '$1', |
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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' => '$1$2$3$4$5$6$7', |
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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' => '$1', |
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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' => ':0', |
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// Replace `background-position:0` with `background-position:0 0` |
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'#(background-position):0(?=[;\}])#si' => '$1:0 0', |
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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' => '.$1', |
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// Minify string value |
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'#(\/\*(?>.*?\*\/))|(?<!content\:)([\'"])([a-z_][a-z0-9\-_]*?)\2(?=[\s\{\}\];,])#si' => '$1$3', |
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'#(\/\*(?>.*?\*\/))|(\burl\()([\'"])([^\s]+?)\3(\))#si' => '$1$2$4$5', |
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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' => '$1$2$3', |
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// Replace `(border|outline):none` with `(border|outline):0` |
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'#(?<=[\{;])(border|outline):none(?=[;\}\!])#' => '$1:0', |
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// Remove empty selector(s) |
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'#(\/\*(?>.*?\*\/))|(^|[\{\}])(?:[^\s\{\}]+)\{\}#s' => '$1$2', |
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]; |
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$buffer = \preg_replace( |
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\array_keys($patterns), |
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\array_values($patterns), |
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$buffer |
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); |
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return $tags['open'] . $buffer . $tags['close']; |
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} |
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} |
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gulch /
minify
