Link/TypolinkViewHelper.php

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

/*                                                                        *
 * 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\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;
use TYPO3\CMS\Frontend\Service\TypoLinkCodecService;

class TypolinkViewHelper extends AbstractViewHelper implements CompilableInterface
{
    public function render($parameter, $target = '', $class = '', $title = '', $additionalParams = '', $additionalAttributes = array())
    {
        return static::renderStatic(
            array(
                'parameter' => $parameter,
                'target' => $target,
                'class' => $class,
                'title' => $title,
                'additionalParams' => $additionalParams,
                'additionalAttributes' => $additionalAttributes
            ),
            $this->buildRenderChildrenClosure(),
            $this->renderingContext
        );
    }

    public static function renderStatic(array $arguments, \Closure $renderChildrenClosure, RenderingContextInterface $renderingContext)
    {
        $parameter = $arguments['parameter'];
        $target = $arguments['target'];
        $class = $arguments['class'];
        $title = $arguments['title'];
        $additionalParams = $arguments['additionalParams'];
        $additionalAttributes = $arguments['additionalAttributes'];

        // Merge the $parameter with other arguments
        $typolinkParameter = self::createTypolinkParameterArrayFromArguments($parameter, $target, $class, $title, $additionalParams);

        // array(param1 -> value1, param2 -> value2) --> "param1=value1 param2=>value2" for typolink.ATagParams
        $extraAttributes = array();
        foreach ($additionalAttributes as $attributeName => $attributeValue) {
            $extraAttributes[] = $attributeName . '="' . htmlspecialchars($attributeValue) . '"';
        }
        $aTagParams = implode(' ', $extraAttributes);

        // If no link has to be rendered, the inner content will be returned as such
        $content = $renderChildrenClosure();

        if ($parameter) {
            $contentObject = GeneralUtility::makeInstance(ContentObjectRenderer::class);
            $contentObject->start(array(), '');
            $content = $contentObject->stdWrap(
                $content,
                array(
                    'typolink.' => array(
                        'parameter' => $typolinkParameter,
                        'ATagParams' => $aTagParams,
                    )
                )
            );
        }

        return $content;
    }

    protected static function createTypolinkParameterArrayFromArguments($parameter, $target = '', $class = '', $title = '', $additionalParams = '')
    {
        $typoLinkCodec = GeneralUtility::makeInstance(TypoLinkCodecService::class);
        $typolinkConfiguration = $typoLinkCodec->decode($parameter);
        if (empty($typolinkConfiguration)) {
            return $typolinkConfiguration;
        }

        // Override target if given in target argument
        if ($target) {
            $typolinkConfiguration['target'] = $target;
        }

        // Combine classes if given in both "parameter" string and "class" argument
        if ($class) {
            if ($typolinkConfiguration['class']) {
                $typolinkConfiguration['class'] .= ' ';
            }
            $typolinkConfiguration['class'] .= $class;
        }

        // Override title if given in title argument
        if ($title) {
            $typolinkConfiguration['title'] = $title;
        }

        // Combine additionalParams
        if ($additionalParams) {
            $typolinkConfiguration['additionalParams'] .= $additionalParams;
        }

        return $typoLinkCodec->encode($typolinkConfiguration);
    }
}