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!                         *
 *                                                                        */

class SwitchViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper implements \TYPO3\CMS\Fluid\Core\ViewHelper\Facets\ChildNodeAccessInterface {

    private $childNodes = array();

    protected $backupSwitchExpression = NULL;

    protected $backupBreakState = FALSE;

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

    public function render($expression) {
        $content = '';
        $this->backupSwitchState();
        $templateVariableContainer = $this->renderingContext->getViewHelperVariableContainer();

        $templateVariableContainer->addOrUpdate('TYPO3\CMS\Fluid\ViewHelpers\SwitchViewHelper', 'switchExpression', $expression);
        $templateVariableContainer->addOrUpdate('TYPO3\CMS\Fluid\ViewHelpers\SwitchViewHelper', 'break', FALSE);

        foreach ($this->childNodes as $childNode) {
            if (
                !$childNode instanceof \TYPO3\CMS\Fluid\Core\Parser\SyntaxTree\ViewHelperNode
                || $childNode->getViewHelperClassName() !== 'TYPO3\CMS\Fluid\ViewHelpers\CaseViewHelper'
            ) {
                continue;
            }
            $content = $childNode->evaluate($this->renderingContext);
            if ($templateVariableContainer->get('TYPO3\CMS\Fluid\ViewHelpers\SwitchViewHelper', 'break') === TRUE) {
                break;
            }
        }

        $templateVariableContainer->remove('TYPO3\CMS\Fluid\ViewHelpers\SwitchViewHelper', 'switchExpression');
        $templateVariableContainer->remove('TYPO3\CMS\Fluid\ViewHelpers\SwitchViewHelper', 'break');

        $this->restoreSwitchState();
        return $content;
    }

    protected function backupSwitchState() {
        if ($this->renderingContext->getViewHelperVariableContainer()->exists('TYPO3\CMS\Fluid\ViewHelpers\SwitchViewHelper', 'switchExpression')) {
            $this->backupSwitchExpression = $this->renderingContext->getViewHelperVariableContainer()->get('TYPO3\CMS\Fluid\ViewHelpers\SwitchViewHelper', 'switchExpression');
        }
        if ($this->renderingContext->getViewHelperVariableContainer()->exists('TYPO3\CMS\Fluid\ViewHelpers\SwitchViewHelper', 'break')) {
            $this->backupBreakState = $this->renderingContext->getViewHelperVariableContainer()->get('TYPO3\CMS\Fluid\ViewHelpers\SwitchViewHelper', 'break');
        }
    }

    protected function restoreSwitchState() {
        if ($this->backupSwitchExpression !== NULL) {
            $this->renderingContext->getViewHelperVariableContainer()->addOrUpdate(
                'TYPO3\CMS\Fluid\ViewHelpers\SwitchViewHelper',
                'switchExpression',
                $this->backupSwitchExpression
            );
        }
        if ($this->backupBreakState !== FALSE) {
            $this->renderingContext->getViewHelperVariableContainer()->addOrUpdate('TYPO3\CMS\Fluid\ViewHelpers\SwitchViewHelper', 'break', TRUE);
        }
    }
}