HtmlViewHelper.php

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<?php
namespace TYPO3\CMS\Fluid\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\Core\Utility\GeneralUtility;
use TYPO3\CMS\Extbase\Configuration\ConfigurationManagerInterface;
use TYPO3\CMS\Extbase\Object\ObjectManager;
use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper;
use TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer;
use TYPO3Fluid\Fluid\Core\Rendering\RenderingContextInterface;
use TYPO3Fluid\Fluid\Core\ViewHelper\Traits\CompileWithRenderStatic;

class HtmlViewHelper extends AbstractViewHelper
{
    use CompileWithRenderStatic;

    protected static $tsfeBackup;

    protected $escapeChildren = false;

    protected $escapeOutput = false;

    public function initializeArguments()
    {
        parent::initializeArguments();
        $this->registerArgument('parseFuncTSPath', 'string', ' path to TypoScript parseFunc setup.', false, 'lib.parseFunc_RTE');
    }

    public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext)
    {
        $parseFuncTSPath = $arguments['parseFuncTSPath'];
        if (TYPO3_MODE === 'BE') {
            self::simulateFrontendEnvironment();
        }
        $value = $renderChildrenClosure();
        $contentObject = GeneralUtility::makeInstance(ContentObjectRenderer::class);
        $contentObject->start([]);
        $content = $contentObject->parseFunc($value, [], '< ' . $parseFuncTSPath);
        if (TYPO3_MODE === 'BE') {
            self::resetFrontendEnvironment();
        }
        return $content;
    }

    protected static function simulateFrontendEnvironment()
    {
        self::$tsfeBackup = isset($GLOBALS['TSFE']) ? $GLOBALS['TSFE'] : null;
        $GLOBALS['TSFE'] = new \stdClass();
        $GLOBALS['TSFE']->tmpl = new \stdClass();
        $objectManager = GeneralUtility::makeInstance(ObjectManager::class);
        $configurationManager = $objectManager->get(ConfigurationManagerInterface::class);
        $GLOBALS['TSFE']->tmpl->setup = $configurationManager->getConfiguration(ConfigurationManagerInterface::CONFIGURATION_TYPE_FULL_TYPOSCRIPT);
    }

    protected static function resetFrontendEnvironment()
    {
        $GLOBALS['TSFE'] = self::$tsfeBackup;
    }
}