Replace MenuItemRenderer interface with a base class MenuItemRenderer

refs #7658

library/Icinga/Web/Menu/MenuItemRenderer.php

@@ -3,11 +3,107 @@
 
 namespace Icinga\Web\Menu;
 
+use Icinga\Application\Icinga;
 use Icinga\Web\Menu;
+use Icinga\Web\View;
 
 /**
- * Renders the html content of a single menu item
+ * Default MenuItemRenderer class
  */
-interface MenuItemRenderer {
-    public function render(Menu $menu);
+class MenuItemRenderer
+{
+    /**
+     * Contains <a> element specific attributes
+     *
+     * @var array
+     */
+    protected $attributes = array();
+
+    /**
+     * View
+     *
+     * @var View|null
+     */
+    protected $view;
+
+    /**
+     * Set the view
+     *
+     * @param   View    $view
+     *
+     * @return  $this
+     */
+    public function setView(View $view)
+    {
+        $this->view = $view;
+        return $this;
+    }
+
+    /**
+     * Get the view
+     *
+     * @return View
+     */
+    public function getView()
+    {
+        if ($this->view === null) {
+            $this->view = Icinga::app()->getViewRenderer()->view;
+        }
+        return $this->view;
+    }
+
+    /**
+     * Renders the html content of a single menu item
+     *
+     * @param Menu $menu
+     *
+     * @return string
+     */
+    public function render(Menu $menu)
+    {
+        return $this->createLink($menu);
+    }
+
+    /**
+     * Creates a menu item link element
+     *
+     * @param Menu $menu
+     *
+     * @return string
+     */
+    public function createLink(Menu $menu)
+    {
+        if ($menu->getIcon() && strpos($menu->getIcon(), '.') === false) {
+            return sprintf(
+                '<a href="%s"%s><i aria-hidden="true" class="icon-%s"></i>%s</a>',
+                $menu->getUrl() ? : '#',
+                $this->getAttributes(),
+                $menu->getIcon(),
+                $this->getView()->escape($menu->getTitle())
+            );
+        }
+
+        return sprintf(
+            '<a href="%s"%s>%s%s<span></span></a>',
+            $menu->getUrl() ? : '#',
+            $this->getAttributes(),
+            $menu->getIcon() ? '<img aria-hidden="true" src="' . Url::fromPath($menu->getIcon()) . '" class="icon" /> ' : '',
+            $this->getView()->escape($menu->getTitle())
+        );
+    }
+
+    /**
+     * Returns <a> element specific attributes if present
+     *
+     * @return string
+     */
+    protected function getAttributes()
+    {
+        $attributes = '';
+        $view = $this->getView();
+        foreach ($this->attributes as $attribute => $value) {
+            $attributes .= ' ' . $view->escape($attribute) . '="' . $view->escape($value) . '"';
+        }
+        return $attributes;
+    }
 }