<?php declare(strict_types=1);

namespace PhpParser\NodeVisitor;

use PhpParser\Node;
use PhpParser\NodeVisitorAbstract;

/**
 * Visitor that connects a child node to its parent node
 * as well as its sibling nodes.
 *
 * On the child node, the parent node can be accessed through
 * <code>$node->getAttribute('parent')</code>, the previous
 * node can be accessed through <code>$node->getAttribute('previous')</code>,
 * and the next node can be accessed through <code>$node->getAttribute('next')</code>.
 */
final class NodeConnectingVisitor extends NodeVisitorAbstract {
    /**
     * @var Node[]
     */
    private array $stack = [];

    /**
     * @var ?Node
     */
    private $previous;

    public function beforeTraverse(array $nodes) {
        $this->stack    = [];
        $this->previous = null;
    }

    public function enterNode(Node $node) {
        if (!empty($this->stack)) {
            $node->setAttribute('parent', $this->stack[count($this->stack) - 1]);
        }

        if ($this->previous !== null && $this->previous->getAttribute('parent') === $node->getAttribute('parent')) {
            $node->setAttribute('previous', $this->previous);
            $this->previous->setAttribute('next', $node);
        }

        $this->stack[] = $node;
    }

    public function leaveNode(Node $node) {
        $this->previous = $node;

        array_pop($this->stack);
    }
}

• [F] CloningVisitor.php
  Delete
• [F] CommentAnnotatingVisitor.php
  Delete
• [F] FindingVisitor.php
  Delete
• [F] FirstFindingVisitor.php
  Delete
• [F] NameResolver.php
  Delete
• [F] NodeConnectingVisitor.php
  Delete
• [F] ParentConnectingVisitor.php
  Delete

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