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