GroupListViewHelper.php

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<?php
namespace TYPO3\CMS\IndexedSearch\ViewHelpers\Format;

/*
 * 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!
 */

use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper;
use TYPO3Fluid\Fluid\Core\Rendering\RenderingContextInterface;
use TYPO3Fluid\Fluid\Core\ViewHelper\Traits\CompileWithRenderStatic;

class GroupListViewHelper extends AbstractViewHelper
{
    use CompileWithRenderStatic;

    public function initializeArguments()
    {
        parent::initializeArguments();
        $this->registerArgument('groups', 'array', '', false, []);
    }

    public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext)
    {
        $groups = $arguments['groups'];

        $str = [];
        foreach ($groups as $row) {
            $str[] = $row['gr_list'] === '0,-1' ? 'NL' : $row['gr_list'];
        }
        arsort($str);
        return implode('|', $str);
    }
}