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<?php namespace Luminaire\Premailer\Parser; |
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/** |
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* Created by Sublime Text 3 |
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* |
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* @user Kevin Tanjung |
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* @website http://kevintanjung.github.io |
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* @email [email protected] |
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* @date 03/08/2016 |
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* @time 13:58 |
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*/ |
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use DOMDocument; |
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use DOMElement; |
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use RuntimeException; |
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/** |
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* The "CSS Stylesheet Parser" class |
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* |
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* @package \Luminaire\Premailer\Parser |
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*/ |
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class StylesheetParser |
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{ |
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/** |
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* The DOM Document instance |
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* |
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* @var \DOMDocument |
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*/ |
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protected $document; |
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/** |
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* Create a new instance of Style Sheet Extractor |
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* |
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* @param \DOMDocument|null $document |
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*/ |
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public function __construct(DOMDocument $document = null) |
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{ |
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if ($document) |
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{ |
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$this->setDocument($document); |
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} |
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} |
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/** |
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* Get the DOM Document instance |
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* |
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* @return \DOMDocument|null |
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*/ |
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public function getDocument() |
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{ |
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return $this->document; |
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} |
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/** |
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* Set the DOM Document instance |
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* |
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* @param \DOMDocument $document |
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* @return $this |
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*/ |
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public function setDocument(DOMDocument $document) |
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{ |
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$this->document = $document; |
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return $this; |
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} |
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/** |
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* Get all CSS in the mail template |
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* |
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* @return string |
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* |
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* @throws \RuntimeException |
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*/ |
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public function extract() |
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{ |
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if ( ! $this->document) |
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{ |
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throw new RuntimeException('There are no [DOMDocument] instance to work with. Use the [setDocument] method to pass an instance of the [DOMDocument].'); |
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} |
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$stylesheet = ""; |
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foreach ($this->getStyleTags($this->document) as $node) |
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{ |
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if ($content = $this->getStyleTagContent($node)) |
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{ |
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$stylesheet .= $content . "\r\n"; |
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} |
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$node->parentNode->removeChild($node); |
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} |
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return $stylesheet; |
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} |
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/** |
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* Get all DOM element that has "style" attribute |
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* |
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* @param \DOMDocument $doc |
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* @return array |
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*/ |
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protected function getStyleTags(DOMDocument $doc) |
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{ |
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$nodes = []; |
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foreach ($doc->getElementsByTagName('style') as $element) |
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{ |
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$nodes[] = $element; |
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} |
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return $nodes; |
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} |
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/** |
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* Get the HTML <style> tag CSS content |
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* |
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* @param \DOMElement $node |
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* @return string|null |
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*/ |
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protected function getStyleTagContent(DOMElement $node) |
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{ |
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if ( ! $this->isStyleTypeAllowed($node) || ! $this->isStyleMediaAllowed($node)) |
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{ |
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return null; |
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} |
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return (string) $node->nodeValue; |
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} |
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/** |
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* Check if the HTML <style> tag has no [media] attribute or if it has a |
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* [media] attribute, then it must either have a value of "all" or "screen". |
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* |
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* @param \DOMElement $style_node |
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* @return bool |
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*/ |
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private function isStyleMediaAllowed(DOMElement $style_node) |
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{ |
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$media = $style_node->attributes->getNamedItem('media'); |
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if (is_null($media)) return true; |
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$media = str_replace(' ', '', (string) $media->nodeValue); |
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$media_types = explode(',', $media); |
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return in_array('all', $media_types) || in_array('screen', $media_types); |
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} |
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/** |
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* Check if the HTML <style> tag has the default [type] attribute or the value |
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* of the [type] attribute is set to "text/css". |
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* |
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* @param \DOMElement $style_node |
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* @return bool |
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*/ |
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private function isStyleTypeAllowed(DOMElement $style_node) |
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{ |
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$type = $style_node->attributes->getNamedItem('type'); |
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return is_null($type) || (string) $type->nodeValue == 'text/css'; |
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} |
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} |
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luminaire /
premailer
