140 lines
3.5 KiB
PHP
140 lines
3.5 KiB
PHP
<?php
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namespace Masterminds\HTML5\Parser;
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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 - 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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{
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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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{
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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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{
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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 The new Current DOM element.
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*/
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public function evaluate($new, $current)
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{
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switch ($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(
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'optgroup'
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));
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case 'option':
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return $this->closeIfCurrentMatches($new, $current, array(
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'option',
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));
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case 'tr':
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return $this->closeIfCurrentMatches($new, $current, array(
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'tr'
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));
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case 'td':
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case 'th':
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return $this->closeIfCurrentMatches($new, $current, array(
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'th',
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'td'
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));
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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(
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'thead',
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'tfoot',
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'tbody'
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));
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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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{
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return $this->closeIfCurrentMatches($ele, $current, array(
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'li'
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));
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}
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protected function handleDT($ele, $current)
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{
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return $this->closeIfCurrentMatches($ele, $current, array(
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'dt',
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'dd'
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));
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}
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protected function handleRT($ele, $current)
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{
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return $this->closeIfCurrentMatches($ele, $current, array(
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'rt',
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'rp'
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));
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}
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protected function closeIfCurrentMatches($ele, $current, $match)
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{
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$tname = $current->tagName;
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if (in_array($current->tagName, $match)) {
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$current->parentNode->appendChild($ele);
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} else {
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$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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