CmsVariableProvider.php

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<?php
namespace TYPO3\CMS\Fluid\Core\Variables;

/*
 * 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!
 */

class CmsVariableProvider extends \TYPO3Fluid\Fluid\Core\Variables\StandardVariableProvider
{
    public function getByPath($path, array $accessors = [])
    {
        $path = $this->resolveSubVariableReferences($path);
        return \TYPO3\CMS\Extbase\Reflection\ObjectAccess::getPropertyPath($this->variables, $path);
    }

    protected function resolveSubVariableReferences($propertyPath)
    {
        if (strpos($propertyPath, '{') !== false) {
            preg_match_all('/(\{.*\})/', $propertyPath, $matches);
            foreach ($matches[1] as $match) {
                $subPropertyPath = substr($match, 1, -1);
                $propertyPath = str_replace($match, $this->getByPath($subPropertyPath), $propertyPath);
            }
        }
        return $propertyPath;
    }
}