Implement and apply icon viewhelper

public/typo3conf/ext/ep_theme/Classes/ViewHelpers/IconViewHelper.php

@@ -4,49 +4,33 @@ namespace EP\EpTheme\ViewHelpers;
 
 use TYPO3\CMS\Core\Utility\GeneralUtility;
 use TYPO3\CMS\Extbase\Service\ImageService;
-use TYPO3Fluid\Fluid\Core\Rendering\RenderingContextInterface;
-use TYPO3Fluid\Fluid\Core\ViewHelper\AbstractViewHelper;
-use TYPO3Fluid\Fluid\Core\ViewHelper\Traits\CompileWithRenderStatic;
+use TYPO3Fluid\Fluid\Core\ViewHelper\AbstractTagBasedViewHelper;
 
-class IconViewHelper extends AbstractViewHelper
+class IconViewHelper extends AbstractTagBasedViewHelper
 {
-    use CompileWithRenderStatic;
-
     /**
-     * @var bool
+     * @var string
      */
-    protected $escapeOutput = false;
+    protected $tagName = 'svg';
 
     public function initializeArguments()
     {
         parent::initializeArguments();
 
-        $this->registerArgument('icon', 'string', 'Icon name');
-        $this->registerArgument('class', 'string', 'CSS classes');
+        $this->registerUniversalTagAttributes();
+        $this->registerArgument('icon', 'string', 'Icon name', true);
     }
 
-    /**
-     * @param array $arguments
-     * @param \Closure $renderChildrenClosure
-     * @param RenderingContextInterface $renderingContext
-     * @return mixed
-     */
-    public static function renderStatic(
-        array $arguments,
-        \Closure $renderChildrenClosure,
-        RenderingContextInterface $renderingContext
-    )
+    public function render(): string
     {
         $imageService = self::getImageService();
         $sprite = $imageService->getImage('EXT:ep_theme/Resources/Public/images/icons_sprite.svg', null, false);
         $imageUrl = $sprite->getPublicUrl();
 
-        return sprintf(
-            '<svg class="%s"><use href="%s#icon-%s"></use></svg>',
-            $arguments['class'],
-            $imageUrl,
-            $arguments['icon']
-        );
+        $content = sprintf('<use href="%s#icon-%s"></use>', $imageUrl, $this->arguments['icon']);
+        $this->tag->setContent($content);
+
+        return $this->tag->render();
     }
 
     protected static function getImageService()