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<?php
declare(strict_types=1);
/*
* This file is part of the TYPO3 CMS project.
*
* It is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, either version 2
* of the License, or any later version.
*
* For the full copyright and license information, please read the
* LICENSE.txt file that was distributed with this source code.
*
* The TYPO3 project - inspiring people to share!
*/
namespace TYPO3\CMS\Core\TypoScript\AST\Traverser;
use TYPO3\CMS\Core\TypoScript\AST\CurrentObjectPath\CurrentObjectPath;
use TYPO3\CMS\Core\TypoScript\AST\Node\NodeInterface;
use TYPO3\CMS\Core\TypoScript\AST\Node\RootNode;
use TYPO3\CMS\Core\TypoScript\AST\Visitor\AstVisitorInterface;
/**
* Traverse the entire AST.
*
* @internal: Internal AST structure.
*/
final class AstTraverser
{
/**
* @param AstVisitorInterface[] $visitors
*/
public function traverse(RootNode $rootNode, array $visitors): void
{
foreach ($visitors as $visitor) {
if (!$visitor instanceof AstVisitorInterface) {
throw new \RuntimeException(
'Visitors must implement AstTreeVisitorInterface',
1689244842
);
}
}
$currentObjectPath = new CurrentObjectPath();
$this->traverseRecursive($visitors, $rootNode, $rootNode, $currentObjectPath, 0);
}
/**
* @param AstVisitorInterface[] $visitors
*/
private function traverseRecursive(array $visitors, RootNode $nodeRoot, NodeInterface $node, CurrentObjectPath $currentObjectPath, int $currentDepth): void
{
$currentObjectPath->append($node);
foreach ($visitors as $visitor) {
$visitor->visitBeforeChildren($nodeRoot, $node, $currentObjectPath, $currentDepth);
}
foreach ($node->getNextChild() as $child) {
$this->traverseRecursive($visitors, $nodeRoot, $child, $currentObjectPath, $currentDepth + 1);
foreach ($visitors as $visitor) {
$visitor->visit($nodeRoot, $child, $currentObjectPath, $currentDepth);
}
}
foreach ($visitors as $visitor) {
$visitor->visitAfterChildren($nodeRoot, $node, $currentObjectPath, $currentDepth);
}
$currentObjectPath->removeLast();
}
}