SwitchViewHelper.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!                         *
 *                                                                        */

use TYPO3Fluid\Fluid\Core\Compiler\StopCompilingException;
use TYPO3Fluid\Fluid\Core\Compiler\TemplateCompiler;
use TYPO3Fluid\Fluid\Core\Parser\SyntaxTree\NodeInterface;
use TYPO3Fluid\Fluid\Core\Parser\SyntaxTree\ViewHelperNode;
use TYPO3Fluid\Fluid\ViewHelpers\CaseViewHelper as OriginalCaseViewHelper;
use TYPO3Fluid\Fluid\ViewHelpers\DefaultCaseViewHelper;

class SwitchViewHelper extends \TYPO3Fluid\Fluid\ViewHelpers\SwitchViewHelper
{
    protected function isDefaultCaseNode(NodeInterface $node)
    {
        if ($node instanceof ViewHelperNode) {
            $viewHelperClassName = $node->getViewHelperClassName();
            $arguments = $node->getArguments();
            return
                $viewHelperClassName === DefaultCaseViewHelper::class ||
                (
                    $viewHelperClassName === CaseViewHelper::class && isset($arguments['default']) && $arguments['default']
                )
            ;
        }
        return false;
    }

    protected function isCaseNode(NodeInterface $node)
    {
        if ($node instanceof ViewHelperNode) {
            $viewHelperClassName = $node->getViewHelperClassName();
            return $viewHelperClassName === CaseViewHelper::class || $viewHelperClassName === OriginalCaseViewHelper::class;
        }
        return false;
    }

    public function compile($argumentsName, $closureName, &$initializationPhpCode, ViewHelperNode $node, TemplateCompiler $compiler)
    {
        if (count($node->getChildNodes())) {
            throw new StopCompilingException('switch view helper', 1476122366);
        }
    }
}