SetupConfigMerger.php

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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\Merger;
 
use ‪TYPO3\CMS\Core\TypoScript\AST\Node\ChildNodeInterface;
use ‪TYPO3\CMS\Core\TypoScript\AST\Node\NodeInterface;
use ‪TYPO3\CMS\Core\TypoScript\AST\Node\RootNode;
 
final readonly class ‪SetupConfigMerger
{
    public function ‪merge(?‪ChildNodeInterface $config, ?‪ChildNodeInterface $pageConfig): ‪RootNode
    {
        $configResult = new ‪RootNode();
        if ($config) {
            foreach ($config->‪getNextChild() as $child) {
                $configResult->addChild($child);
            }
        }
        if (!$pageConfig) {
            return $configResult;
        }
        $this->‪mergeRecursive($pageConfig, $configResult);
        return $configResult;
    }
 
    private function ‪mergeRecursive(‪ChildNodeInterface $mergeFrom, ‪NodeInterface $mergeTo): void
    {
        foreach ($mergeFrom->‪getNextChild() as $mergeFromChild) {
            $mergeToChild = $mergeTo->‪getChildByName($mergeFromChild->getName());
            if (!$mergeToChild) {
                $mergeTo->‪addChild($mergeFromChild);
                continue;
            }
            $mergeFromChildValue = $mergeFromChild->getValue();
            if ($mergeFromChildValue !== null && $mergeFromChildValue !== $mergeToChild->getValue()) {
                $mergeToChild->setValue($mergeFromChildValue);
            }
            $this->‪mergeRecursive($mergeFromChild, $mergeToChild);
        }
    }
}