Better alias handling for Twig extension

extensions/twig/ViewRenderer.php

@@ -144,15 +144,27 @@ class ViewRenderer extends BaseViewRenderer
     {
         $this->twig->addGlobal('this', $view);
         $loader = new \Twig_Loader_Filesystem(dirname($file));
+        $this->addAliases($loader, Yii::$aliases);
+        $this->twig->setLoader($loader);
+
+        return $this->twig->render(pathinfo($file, PATHINFO_BASENAME), $params);
+    }
 
-        foreach (Yii::$aliases as $alias => $path) {
-            if (is_string($path) && is_dir($path)) {
+    /**
+     * Adds aliases
+     *
+     * @param \Twig_Loader_Filesystem $loader
+     * @param array $aliases
+     */
+    protected function addAliases($loader, $aliases)
+    {
+        foreach ($aliases as $alias => $path) {
+            if (is_array($path)) {
+                $this->addAliases($loader, $path);
+            } elseif (is_string($path) && is_dir($path)) {
                 $loader->addPath($path, substr($alias, 1));
             }
         }
-        $this->twig->setLoader($loader);
-
-        return $this->twig->render(pathinfo($file, PATHINFO_BASENAME), $params);
     }
 
     /**