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<?php |
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namespace Staticka\Filter; |
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/** |
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* HTML Minifier |
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* |
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* @package Staticka |
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* @author Rougin Royce Gutib <[email protected]> |
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*/ |
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class HtmlMinifier implements FilterInterface |
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{ |
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/** |
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* Filters the specified code. |
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* |
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* @param string $code |
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* @return string |
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*/ |
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public function filter($code) |
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{ |
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if (strpos($code, '<html') === false) |
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{ |
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return $this->minify($code); |
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} |
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list($uniqid, $code) = $this->parse($code); |
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$excluded = (array) $this->excluded($code); |
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$html = $this->minify($code, (string) $uniqid); |
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foreach ((array) $excluded as $item) |
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{ |
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$original = str_replace($uniqid, "\n", $item); |
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$current = $this->minify(htmlspecialchars($item)); |
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if ($current && strpos($html, $current) === false) |
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{ |
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$encoded = htmlspecialchars($item, ENT_QUOTES); |
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$current = $this->minify((string) $encoded); |
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} |
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$html = str_replace($current, $original, $html); |
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} |
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$html = str_replace($uniqid, '', trim($html)); |
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return str_replace('> <', '><', (string) $html); |
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} |
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/** |
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* Returns elements to be excluded when minifying. |
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* |
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* @param string $html |
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* @return array |
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*/ |
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protected function excluded($html) |
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{ |
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libxml_use_internal_errors(true); |
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$data = array(); |
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$utf8 = (string) '<?xml encoding="UTF-8">'; |
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$dom = new \DOMDocument; |
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$dom->loadHTML((string) $utf8 . $html); |
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$allowed = array('code', 'textarea', 'pre'); |
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$items = $dom->getElementsByTagName('*'); |
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foreach ($items as $node) |
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if (in_array($node->nodeName, $allowed)) |
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array_push($data, $node->nodeValue); |
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} |
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} |
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return (array) $data; |
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} |
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/** |
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* Minifies the specified HTML. |
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* |
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* @param string $html |
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* @param string|null $uniqid |
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* @return string |
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*/ |
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protected function minify($html, $uniqid = null) |
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{ |
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$html = str_replace('<?xml encoding="UTF-8">', '', $html); |
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$html = preg_replace('/\s+/', ' ', $html); |
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$html = str_replace('> <', '><', (string) $html); |
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if ($uniqid) |
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{ |
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$html = str_replace($uniqid . ' <', $uniqid . '<', $html); |
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} |
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return str_replace(array(' />', '/>'), '>', $html); |
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} |
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/** |
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* Parses the spaces to the entire HTML. |
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* |
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* @param string $html |
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* @return string |
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*/ |
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3 |
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protected function parse($html) |
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{ |
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$search = (array) array("\r\n", "\n"); |
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$uniqid = (string) uniqid(); |
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$code = str_replace($search, $uniqid, $html); |
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return array($uniqid, (string) $code); |
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} |
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} |
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staticka /
staticka
