public function transform(TranscodeNodeEvent $event)
{
$node = $event->getNode();
if (!$node instanceof \DOMElement) {
throw new \RuntimeException('AddPositionClassTransformer can only process element nodes');
}
if ($event->getPosition() === 0) {
$node->setAttribute('class', 'first');
}
if ($this->isLastSiblingElement($node)) {
$node->setAttribute('class', 'last');
}
}
/**
* @return \DOMElement
*/
public function getNode()
{
return parent::getNode();
}