File vendor/nikic/php-parser/lib/PhpParser/NodeVisitor/ParentConnectingVisitor.php

1:	<?php declare(strict_types=1);
2:
3:	namespace PhpParser\NodeVisitor;
4:
5:	use PhpParser\Node;
6:	use PhpParser\NodeVisitorAbstract;
7:
8:	use function array_pop;
9:	use function count;
10:
11:	/**
12:	* Visitor that connects a child node to its parent node.
13:	*
14:	* With <code>$weakReferences=false</code> on the child node, the parent node can be accessed through
15:	* <code>$node->getAttribute('parent')</code>.
16:	*
17:	* With <code>$weakReferences=true</code> the attribute name is "weak_parent" instead.
18:	*/
19:	final class ParentConnectingVisitor extends NodeVisitorAbstract {
20:	/**
21:	* @var Node[]
22:	*/
23:	private array $stack = [];
24:
25:	private bool $weakReferences;
26:
27:	public function __construct(bool $weakReferences = false) {
28:	$this->weakReferences = $weakReferences;
29:	}
30:
31:	public function beforeTraverse(array $nodes) {
32:	$this->stack = [];
33:	}
34:
35:	public function enterNode(Node $node) {
36:	if (!empty($this->stack)) {
37:	$parent = $this->stack[count($this->stack) - 1];
38:	if ($this->weakReferences) {
39:	$node->setAttribute('weak_parent', \WeakReference::create($parent));
40:	} else {
41:	$node->setAttribute('parent', $parent);
42:	}
43:	}
44:
45:	$this->stack[] = $node;
46:	}
47:
48:	public function leaveNode(Node $node) {
49:	array_pop($this->stack);
50:	}
51:	}
52: