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<?php
namespace Masterminds\HTML5\Parser;
use Masterminds\HTML5\Elements;
/**
* Handles special-case rules for the DOM tree builder.
*
* Many tags have special rules that need to be accomodated on an
* individual basis. This class handles those rules.
*
* See section 8.1.2.4 of the spec.
*
* @todo
* - colgroup and col special behaviors
* - body and head special behaviors
*/
class TreeBuildingRules {
protected static $tags = array(
'li' => 1,
'dd' => 1,
'dt' => 1,
'rt' => 1,
'rp' => 1,
'tr' => 1,
'th' => 1,
'td' => 1,
'thead' => 1,
'tfoot' => 1,
'tbody' => 1,
'table' => 1,
'optgroup' => 1,
'option' => 1,
);
/**
* Build a new rules engine.
*
* @param \DOMDocument $doc
* The DOM document to use for evaluation and modification.
*/
public function __construct($doc) {
$this->doc = $doc;
}
/**
* Returns TRUE if the given tagname has special processing rules.
*/
public function hasRules($tagname) {
return isset(static::$tags[$tagname]);
}
/**
* Evaluate the rule for the current tag name.
*
* This may modify the existing DOM.
*
* @return \DOMElement
* The new Current DOM element.
*/
public function evaluate($new, $current) {
switch($new->tagName) {
case 'li':
return $this->handleLI($new, $current);
case 'dt':
case 'dd':
return $this->handleDT($new, $current);
case 'rt':
case 'rp':
return $this->handleRT($new, $current);
case 'optgroup':
return $this->closeIfCurrentMatches($new, $current, array('optgroup'));
case 'option':
return $this->closeIfCurrentMatches($new, $current, array('option', 'optgroup'));
case 'tr':
return $this->closeIfCurrentMatches($new, $current, array('tr'));
case 'td':
case 'th':
return $this->closeIfCurrentMatches($new, $current, array('th', 'td'));
case 'tbody':
case 'thead':
case 'tfoot':
case 'table': // Spec isn't explicit about this, but it's necessary.
return $this->closeIfCurrentMatches($new, $current, array('thead', 'tfoot', 'tbody'));
}
return $current;
}
protected function handleLI($ele, $current) {
return $this->closeIfCurrentMatches($ele, $current, array('li'));
}
protected function handleDT($ele, $current) {
return $this->closeIfCurrentMatches($ele, $current, array('dt','dd'));
}
protected function handleRT($ele, $current) {
return $this->closeIfCurrentMatches($ele, $current, array('rt','rp'));
}
protected function closeIfCurrentMatches($ele, $current, $match) {
$tname = $current->tagName;
if (in_array($current->tagName, $match)) {
$current->parentNode->appendChild($ele);
}
else {
$current->appendChild($ele);
}
return $ele;
}
}
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