HtmlViewHelper.php

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

/*                                                                        *
 * This script is part of the TYPO3 project - inspiring people to share!  *
 *                                                                        *
 * TYPO3 is free software; you can redistribute it and/or modify it under *
 * the terms of the GNU General Public License version 2 as published by  *
 * the Free Software Foundation.                                          *
 *                                                                        *
 * This script is distributed in the hope that it will be useful, but     *
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN-    *
 * TABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General      *
 * Public License for more details.                                       *
 *                                                                        */

use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Extbase\Configuration\ConfigurationManagerInterface;
use TYPO3\CMS\Extbase\Object\ObjectManager;
use TYPO3\CMS\Fluid\Core\Rendering\RenderingContextInterface;
use TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper;
use TYPO3\CMS\Fluid\Core\ViewHelper\Facets\CompilableInterface;
use TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer;

class HtmlViewHelper extends AbstractViewHelper implements CompilableInterface
{
    protected static $tsfeBackup;

    protected $escapingInterceptorEnabled = false;

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

    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;
    }
}