ExternalViewHelper.php

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

/*                                                                        *
 * This script is backported from the TYPO3 Flow package "TYPO3.Fluid".   *
 *                                                                        *
 * It is free software; you can redistribute it and/or modify it under    *
 * the terms of the GNU Lesser General Public License, either version 3   *
 *  of the License, or (at your option) any later version.                *
 *                                                                        *
 * The TYPO3 project - inspiring people to share!                         *
 *                                                                        */

class ExternalViewHelper extends \TYPO3\CMS\Fluid\Core\ViewHelper\AbstractTagBasedViewHelper {

    protected $tagName = 'a';

    public function initializeArguments() {
        $this->registerUniversalTagAttributes();
        $this->registerTagAttribute('name', 'string', 'Specifies the name of an anchor');
        $this->registerTagAttribute('rel', 'string', 'Specifies the relationship between the current document and the linked document');
        $this->registerTagAttribute('rev', 'string', 'Specifies the relationship between the linked document and the current document');
        $this->registerTagAttribute('target', 'string', 'Specifies where to open the linked document');
    }

    public function render($uri, $defaultScheme = 'http') {
        $scheme = parse_url($uri, PHP_URL_SCHEME);
        if ($scheme === NULL && $defaultScheme !== '') {
            $uri = $defaultScheme . '://' . $uri;
        }
        $this->tag->addAttribute('href', $uri);
        $this->tag->setContent($this->renderChildren());
        $this->tag->forceClosingTag(TRUE);

        return $this->tag->render();
    }
}