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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 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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* @var array |
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*/ |
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protected $data = array(); |
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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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$utf8 = (string) '<?xml encoding="UTF-8">'; |
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$dom = new \DOMDocument; |
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@$dom->loadHTML((string) $utf8 . $code); |
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$elements = $dom->getElementsByTagName('*'); |
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$this->remove($elements); |
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$html = $this->minify($dom->saveHTML()); |
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return $this->restore((string) $html); |
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} |
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/** |
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* Checks if a specified node has children. |
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* |
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* @param \DOMNode $node |
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* @return boolean |
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*/ |
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protected function childbearing(\DOMNode $node) |
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{ |
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if ($node->hasChildNodes()) |
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foreach ($node->childNodes as $child) |
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if ($child->nodeType === XML_ELEMENT_NODE) |
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{ |
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return true; |
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} |
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} |
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} |
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return false; |
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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 $html |
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* @return string |
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*/ |
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protected function minify($html) |
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{ |
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$html = str_replace('<?xml encoding="UTF-8">', '', $html); |
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$html = trim(preg_replace('/\s+/', ' ', $html)); |
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$html = str_replace('> <', '><', $html); |
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return str_replace(array(' />', '/>'), '>', $html); |
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} |
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/** |
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* Removes the content of single elements. |
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* |
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* @param \DOMNodeList $elements |
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* @return void |
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*/ |
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protected function remove(\DOMNodeList $elements) |
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{ |
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$encoded = array('textarea', 'code'); |
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foreach ($elements as $element) |
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if ($this->childbearing($element)) |
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{ |
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continue; |
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} |
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$output = (string) $element->nodeValue; |
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if (in_array($element->nodeName, $encoded)) |
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{ |
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$output = htmlentities($element->nodeValue); |
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} |
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array_push($this->data, (string) $output); |
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$current = count($this->data) - 1; |
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$element->nodeValue = '$' . $current . '$'; |
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} |
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} |
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/** |
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* Restores the data into the minified HTML. |
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* |
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* @param string $html |
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* @return string |
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*/ |
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protected function restore($html) |
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{ |
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foreach ($this->data as $index => $item) |
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{ |
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$key = (string) '$' . $index . '$'; |
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$html = str_replace($key, $item, $html); |
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} |
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return (string) $html; |
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} |
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} |
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staticka /
staticka
If you suppress an error, we recommend checking for the error condition explicitly: