public function addChild(NodeAbstract $node)
{
if (!$this->allowsNestingAndContent() && $this->hasContent()) {
throw new Exception('A node cannot have both content and nested nodes');
}
if (null !== ($parent = $node->getParent())) {
$parent->removeChild($node);
}
$prev = end($this->childs) ?: null;
$this->childs[] = $node;
$node->setParent($this);
if ($prev) {
$prev->setNextSibling($node);
}
$node->setPreviousSibling($prev);
$node->setNextSibling(null);
}
protected function getParentTag(NodeAbstract $node)
{
if (null !== ($parent = $node->getParent())) {
if ($parent instanceof Tag) {
return $parent;
}
}
}