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<?php namespace Masterminds\HTML5\Serializer; /** * Traverser for walking a DOM tree. * * This is a concrete traverser designed to convert a DOM tree into an * HTML5 document. It is not intended to be a generic DOMTreeWalker * implementation. * * @see http://www.w3.org/TR/2012/CR-html5-20121217/syntax.html#serializing-html-fragments */ class Traverser { /** * Namespaces that should be treated as "local" to HTML5. */ protected static $local_ns = array( 'http://www.w3.org/1999/xhtml' => 'html', 'http://www.w3.org/1998/Math/MathML' => 'math', 'http://www.w3.org/2000/svg' => 'svg', ); protected $dom; protected $options; protected $encode = false; protected $rules; protected $out; /** * Create a traverser. * * @param \DOMNode|\DOMNodeList $dom The document or node to traverse. * @param resource $out A stream that allows writing. The traverser will output into this * stream. * @param array $options An array of options for the traverser as key/value pairs. These include: * - encode_entities: A bool to specify if full encding should happen for all named * charachter references. Defaults to false which escapes &'<>". * - output_rules: The path to the class handling the output rules. */ public function __construct($dom, $out, RulesInterface $rules, $options = array()) { $this->dom = $dom; $this->out = $out; $this->rules = $rules; $this->options = $options; $this->rules->setTraverser($this); } /** * Tell the traverser to walk the DOM. * * @return resource $out Returns the output stream. */ public function walk() { if ($this->dom instanceof \DOMDocument) { $this->rules->document($this->dom); } elseif ($this->dom instanceof \DOMDocumentFragment) { // Document fragments are a special case. Only the children need to // be serialized. if ($this->dom->hasChildNodes()) { $this->children($this->dom->childNodes); } } // If NodeList, loop elseif ($this->dom instanceof \DOMNodeList) { // If this is a NodeList of DOMDocuments this will not work. $this->children($this->dom); } // Else assume this is a DOMNode-like datastructure. else { $this->node($this->dom); } return $this->out; } /** * Process a node in the DOM. * * @param mixed $node A node implementing \DOMNode. */ public function node($node) { // A listing of types is at http://php.net/manual/en/dom.constants.php switch ($node->nodeType) { case XML_ELEMENT_NODE: $this->rules->element($node); break; case XML_TEXT_NODE: $this->rules->text($node); break; case XML_CDATA_SECTION_NODE: $this->rules->cdata($node); break; case XML_PI_NODE: $this->rules->processorInstruction($node); break; case XML_COMMENT_NODE: $this->rules->comment($node); break; // Currently we don't support embedding DTDs. default: //print '<!-- Skipped -->'; break; } } /** * Walk through all the nodes on a node list. * * @param \DOMNodeList $nl A list of child elements to walk through. */ public function children($nl) { foreach ($nl as $node) { $this->node($node); } } /** * Is an element local? * * @param mixed $ele An element that implement \DOMNode. * * @return bool true if local and false otherwise. */ public function isLocalElement($ele) { $uri = $ele->namespaceURI; if (empty($uri)) { return false; } return isset(static::$local_ns[$uri]); } }
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