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

1:	<?php declare(strict_types=1);
2:
3:	namespace PhpParser\NodeVisitor;
4:
5:	use PhpParser\Node;
6:	use PhpParser\NodeVisitorAbstract;
7:
8:	/**
9:	* Visitor that connects a child node to its parent node
10:	* as well as its sibling nodes.
11:	*
12:	* On the child node, the parent node can be accessed through
13:	* <code>$node->getAttribute('parent')</code>, the previous
14:	* node can be accessed through <code>$node->getAttribute('previous')</code>,
15:	* and the next node can be accessed through <code>$node->getAttribute('next')</code>.
16:	*/
17:	final class NodeConnectingVisitor extends NodeVisitorAbstract
18:	{
19:	/**
20:	* @var Node[]
21:	*/
22:	private $stack = [];
23:
24:	/**
25:	* @var ?Node
26:	*/
27:	private $previous;
28:
29:	public function beforeTraverse(array $nodes) {
30:	$this->stack = [];
31:	$this->previous = null;
32:	}
33:
34:	public function enterNode(Node $node) {
35:	if (!empty($this->stack)) {
36:	$node->setAttribute('parent', $this->stack[count($this->stack) - 1]);
37:	}
38:
39:	if ($this->previous !== null && $this->previous->getAttribute('parent') === $node->getAttribute('parent')) {
40:	$node->setAttribute('previous', $this->previous);
41:	$this->previous->setAttribute('next', $node);
42:	}
43:
44:	$this->stack[] = $node;
45:	}
46:
47:	public function leaveNode(Node $node) {
48:	$this->previous = $node;
49:
50:	array_pop($this->stack);
51:	}
52:	}
53: