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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2017 The s9e Authors |
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License |
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*/ |
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namespace s9e\TextFormatter\Configurator\TemplateNormalizations; |
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use DOMAttr; |
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use s9e\TextFormatter\Configurator\Helpers\TemplateHelper; |
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class MinifyInlineCSS extends AbstractNormalization |
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{ |
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/** |
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* {@inheritdoc} |
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*/ |
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protected $queries = ['//*[namespace-uri() != $XSL]/@style']; |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function normalizeAttribute(DOMAttr $attribute) |
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{ |
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$css = $attribute->nodeValue; |
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// Only minify if the value does not contain any XPath expression that's not an attribute |
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if (!preg_match('(\\{(?!@\\w+\\}))', $css)) |
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{ |
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$attribute->nodeValue = $this->minify($css); |
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} |
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} |
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/** |
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* Minify a CSS string |
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* |
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* @param string $css Original CSS |
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* @return string Minified CSS |
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*/ |
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protected function minify($css) |
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{ |
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$css = trim($css, " \n\t;"); |
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$css = preg_replace('(\\s*([,:;])\\s*)', '$1', $css); |
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$css = preg_replace_callback( |
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'((?<=[\\s:])#[0-9a-f]{3,6})i', |
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function ($m) |
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{ |
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return strtolower($m[0]); |
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}, |
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$css |
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); |
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$css = preg_replace('((?<=[\\s:])#([0-9a-f])\\1([0-9a-f])\\2([0-9a-f])\\3)', '#$1$2$3', $css); |
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$css = preg_replace('((?<=[\\s:])#f00\\b)', 'red', $css); |
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$css = preg_replace('((?<=[\\s:])0px\\b)', '0', $css); |
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return $css; |
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} |
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} |
s9e /
TextFormatter
