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 TYPO3\CMS\Fluid\Core\Rendering\RenderingContextInterface;
use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper;
use TYPO3\CMS\Fluid\Core\ViewHelper\Facets\ChildNodeAccessInterface;
use TYPO3\CMS\Fluid\Core\ViewHelper\Facets\CompilableInterface;

class SwitchViewHelper extends AbstractViewHelper implements ChildNodeAccessInterface, CompilableInterface
{
    private $childNodes = [];

    protected $backupSwitchExpression = null;

    protected $backupBreakState = false;

    public function setChildNodes(array $childNodes)
    {
        $this->childNodes = $childNodes;
    }

    public function render($expression)
    {
        return static::renderStatic(
            [
                'expression' => $expression
            ],
            $this->buildRenderChildrenClosure(),
            $this->renderingContext
        );
    }

    public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext)
    {
        $viewHelperVariableContainer = $renderingContext->getViewHelperVariableContainer();

        $stackValue = [
            'expression' => $arguments['expression'],
            'break' => false
        ];

        if ($viewHelperVariableContainer->exists(self::class, 'stateStack')) {
            $stateStack = $viewHelperVariableContainer->get(self::class, 'stateStack');
        } else {
            $stateStack = [];
        }
        $stateStack[] = $stackValue;
        $viewHelperVariableContainer->addOrUpdate(self::class, 'stateStack', $stateStack);

        $result = $renderChildrenClosure();

        $stateStack = $viewHelperVariableContainer->get(self::class, 'stateStack');
        array_pop($stateStack);
        $viewHelperVariableContainer->addOrUpdate(self::class, 'stateStack', $stateStack);

        return $result;
    }
}