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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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