ParentConnectingVisitor.php
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ParentConnectingVisitor.php
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	<?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);
	}
	}