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<?php namespace Masterminds\HTML5\Parser; /** * 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 $tags = array( 'li' => 1, 'dd' => 1, 'dt' => 1, 'rt' => 1, 'rp' => 1, 'tr' => 1, 'th' => 1, 'td' => 1, 'thead' => 1, 'tfoot' => 1, 'tbody' => 1, 'table' => 1, 'optgroup' => 1, 'option' => 1, ); /** * Returns true if the given tagname has special processing rules. */ public function hasRules($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', )); 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, $match) { if (in_array($current->tagName, $match, true)) { $current->parentNode->appendChild($ele); } else { $current->appendChild($ele); } return $ele; } }
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