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.                                       *
 *                                                                        */
class CropViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper {

    protected $contentObject;

    protected $tsfeBackup;

    protected $configurationManager;

    public function injectConfigurationManager(\TYPO3\CMS\Extbase\Configuration\ConfigurationManagerInterface $configurationManager) {
        $this->configurationManager = $configurationManager;
        $this->contentObject = $this->configurationManager->getContentObject();
    }

    public function render($maxCharacters, $append = '...', $respectWordBoundaries = TRUE, $respectHtml = TRUE) {
        $stringToTruncate = $this->renderChildren();
        if (TYPO3_MODE === 'BE') {
            $this->simulateFrontendEnvironment();
        }
        if ($respectHtml) {
            $content = $this->contentObject->cropHTML($stringToTruncate, $maxCharacters . '|' . $append . '|' . $respectWordBoundaries);
        } else {
            $content = $this->contentObject->crop($stringToTruncate, $maxCharacters . '|' . $append . '|' . $respectWordBoundaries);
        }
        if (TYPO3_MODE === 'BE') {
            $this->resetFrontendEnvironment();
        }
        return $content;
    }

    protected function simulateFrontendEnvironment() {
        $this->tsfeBackup = isset($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 {
                $GLOBALS['TSFE']->csConvObj = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\Charset\\CharsetConverter');
            }
        }
        // preparing renderCharset
        if (!is_object($GLOBALS['TSFE']->renderCharset)) {
            if (is_object($GLOBALS['LANG'])) {
                $GLOBALS['TSFE']->renderCharset = $GLOBALS['LANG']->charSet;
            } else {
                $GLOBALS['TSFE']->renderCharset = 'utf-8';
            }
        }
    }

    protected function resetFrontendEnvironment() {
        $GLOBALS['TSFE'] = $this->tsfeBackup;
    }
}