CaseViewHelper.php

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<?php
namespace TYPO3\CMS\Fluid\ViewHelpers;

/*                                                                        *
 * This script is backported from the TYPO3 Flow package "TYPO3.Fluid".   *
 *                                                                        *
 * It is free software; you can redistribute it and/or modify it under    *
 * the terms of the GNU Lesser General Public License, either version 3   *
 *  of the License, or (at your option) any later version.                *
 *                                                                        *
 * The TYPO3 project - inspiring people to share!                         *
 *                                                                        */

class CaseViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper {

    public function render($value = NULL, $default = FALSE) {
        $viewHelperVariableContainer = $this->renderingContext->getViewHelperVariableContainer();
        if (!$viewHelperVariableContainer->exists('TYPO3\CMS\Fluid\ViewHelpers\SwitchViewHelper', 'switchExpression')) {
            throw new \TYPO3\CMS\Fluid\Core\ViewHelper\Exception('The case View helper can only be used within a switch View helper', 1368112037);
        }
        if (is_null($value) && $default === FALSE) {
            throw new \TYPO3\CMS\Fluid\Core\ViewHelper\Exception('The case View helper must have either value or default argument', 1382867521);
        }
        $switchExpression = $viewHelperVariableContainer->get('TYPO3\CMS\Fluid\ViewHelpers\SwitchViewHelper', 'switchExpression');

        // non-type-safe comparison by intention
        if ($default === TRUE || $switchExpression == $value) {
            $viewHelperVariableContainer->addOrUpdate('TYPO3\CMS\Fluid\ViewHelpers\SwitchViewHelper', 'break', TRUE);
            return $this->renderChildren();
        }
        return '';
    }
}