<?php declare(strict_types=1);
namespace PhpParser\NodeVisitor;
use function array_pop;
use function count;
use PhpParser\Node;
use PhpParser\NodeVisitorAbstract;
/**
* Visitor that connects a child node to its parent node.
*
* On the child node, the parent node can be accessed through
* <code>$node->getAttribute('parent')</code>.
*/
final class ParentConnectingVisitor extends NodeVisitorAbstract
{
/**
* @var Node[]
*/
private $stack = [];
public function beforeTraverse(array $nodes)
{
$this->stack = [];
}
public function enterNode(Node $node)
{
if (!empty($this->stack)) {
$node->setAttribute('parent', $this->stack[count($this->stack) - 1]);
}
$this->stack[] = $node;
}
public function leaveNode(Node $node)
{
array_pop($this->stack);
}
}