CropViewHelper.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\Charset\CharsetConverter;
use TYPO3\CMS\Core\Utility\GeneralUtility;
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 CropViewHelper extends AbstractViewHelper implements CompilableInterface
{
    protected static $tsfeBackup;

    public function render($maxCharacters, $append = '...', $respectWordBoundaries = true, $respectHtml = true)
    {
        return static::renderStatic(
            [
                'maxCharacters' => $maxCharacters,
                'append' => $append,
                'respectWordBoundaries' => $respectWordBoundaries,
                'respectHtml' => $respectHtml,
            ],
            $this->buildRenderChildrenClosure(),
            $this->renderingContext
        );
    }

    public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext)
    {
        $maxCharacters = $arguments['maxCharacters'];
        $append = $arguments['append'];
        $respectWordBoundaries = $arguments['respectWordBoundaries'];
        $respectHtml = $arguments['respectHtml'];

        $stringToTruncate = $renderChildrenClosure();
        if (TYPO3_MODE === 'BE') {
            self::simulateFrontendEnvironment();
        }

        // Even if we are in extbase/fluid context here, we're switching to a casual class of the framework here
        // that has no dependency injection and other stuff. Therefor it is ok to use makeInstance instead of
        // the ObjectManager here directly for additional performance
        // Additionally, it would be possible to retrieve the "current" content object via ConfigurationManager->getContentObject(),
        // but both crop() and cropHTML() are "nearly" static and do not depend on current content object settings, so
        // it is safe to use a fresh instance here directly.
        $contentObject = GeneralUtility::makeInstance(ContentObjectRenderer::class);
        if ($respectHtml) {
            $content = $contentObject->cropHTML($stringToTruncate, $maxCharacters . '|' . $append . '|' . $respectWordBoundaries);
        } else {
            $content = $contentObject->crop($stringToTruncate, $maxCharacters . '|' . $append . '|' . $respectWordBoundaries);
        }
        if (TYPO3_MODE === 'BE') {
            self::resetFrontendEnvironment();
        }
        return $content;
    }

    protected static function simulateFrontendEnvironment()
    {
        self::$tsfeBackup = isset($GLOBALS['TSFE']) ? $GLOBALS['TSFE'] : null;
        $GLOBALS['TSFE'] = new \stdClass();
        // preparing csConvObj
        if (!is_object($GLOBALS['TSFE']->csConvObj)) {
            if (is_object($GLOBALS['LANG'])) {
                $GLOBALS['TSFE']->csConvObj = $GLOBALS['LANG']->csConvObj;
            } else {
                $GLOBALS['TSFE']->csConvObj = GeneralUtility::makeInstance(CharsetConverter::class);
            }
        }
        // preparing renderCharset
        if (!is_object($GLOBALS['TSFE']->renderCharset)) {
            if (is_object($GLOBALS['LANG'])) {
                $GLOBALS['TSFE']->renderCharset = $GLOBALS['LANG']->charSet;
            } else {
                $GLOBALS['TSFE']->renderCharset = 'utf-8';
            }
        }
    }

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