protected function visitDeep(Twig_Node $node)
{
if (!$node instanceof Twig_NodeListInterface) {
return $node;
}
$newNodes = array();
foreach ($nodes = $node->getNodes() as $k => $n) {
if (null !== ($n = $this->visit($n))) {
$newNodes[$k] = $n;
}
}
$node->setNodes($newNodes);
return $node;
}
