FormatsViewHelper.php

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<?php
namespace TYPO3\CMS\Documentation\ViewHelpers;

class FormatsViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractViewHelper {

    public function render(\TYPO3\CMS\Documentation\Domain\Model\DocumentTranslation $documentTranslation) {
        $output = '';
        foreach ($documentTranslation->getFormats() as $format) {
            $output .= '<a ';

            $uri = '../' . $format->getPath();
            $extension = substr($uri, strrpos($uri, '.') + 1);
            if (strlen($extension) < 5) {
                // This is direct link to a file
                $output .= 'href="' . $uri . '"';
            } else {
                $extension = $format->getFormat();
                if ($extension === 'json') {
                    $extension = 'js';
                }
                $output .= 'href="#" onclick="top.TYPO3.Backend.ContentContainer.setUrl(\'' . $uri . '\')"';
            }

            $xliff = 'LLL:EXT:documentation/Resources/Private/Language/locallang.xlf';
            $title = sprintf(
                $GLOBALS['LANG']->sL($xliff . ':tx_documentation_domain_model_documentformat.format.title'),
                $format->getFormat()
            );
            $output .= ' title="' . htmlspecialchars($title) . '">';
            $spriteIconHtml = \TYPO3\CMS\Backend\Utility\IconUtility::getSpriteIconForFile($extension);
            $output .= $spriteIconHtml . '</a>' . LF;
        }
        return $output;
    }

}