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diff --git a/www/wiki/skins/chameleon/src/Menu/Menu.php b/www/wiki/skins/chameleon/src/Menu/Menu.php
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+<?php
+/**
+ * File holding the abstract Menu class
+ *
+ * This file is part of the MediaWiki skin Chameleon.
+ *
+ * @copyright 2013 - 2014, Stephan Gambke
+ * @license   GNU General Public License, version 3 (or any later version)
+ *
+ * The Chameleon skin is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option) any
+ * later version.
+ *
+ * The Chameleon skin is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @file
+ * @ingroup   Skins
+ */
+
+namespace Skins\Chameleon\Menu;
+
+/**
+ * Class Menu
+ *
+ * @author  Stephan Gambke
+ * @since   1.0
+ * @ingroup Skins
+ */
+abstract class Menu {
+
+	private $menuItemFormatter = null;
+	private $itemListFormatter = null;
+
+	abstract public function getHtml();
+
+	/**
+	 * @param string $href
+	 * @param string $text
+	 * @param int    $depth
+	 * @param string $subitems
+	 *
+	 * @return string
+	 */
+	protected function getHtmlForMenuItem( $href, $text, $depth, $subitems ) {
+		return call_user_func( $this->getMenuItemFormatter(), $href, $text, $depth, $subitems );
+	}
+
+	/**
+	 * @return callable
+	 */
+	public function getMenuItemFormatter() {
+
+		if ( $this->menuItemFormatter === null ) {
+
+			$this->setMenuItemFormatter( function ( $href, $text, $depth, $subitems ) {
+				$href = \Sanitizer::cleanUrl( $href );
+				$text = htmlspecialchars( $text );
+				$indent = str_repeat( "\t", 2 * $depth );
+
+				if ( $subitems !== '' ) {
+					return "$indent<li>\n$indent\t<a href=\"$href\">$text</a>\n$subitems$indent</li>\n";
+				} else {
+					return "$indent<li><a href=\"$href\">$text</a></li>\n";
+				}
+			} );
+
+		}
+
+		return $this->menuItemFormatter;
+	}
+
+	/**
+	 * @param callable $menuItemFormatter
+	 */
+	public function setMenuItemFormatter( $menuItemFormatter ) {
+		$this->menuItemFormatter = $menuItemFormatter;
+	}
+
+	/**
+	 * @param string $rawItemsHtml
+	 * @param int    $depth
+	 *
+	 * @return string
+	 */
+	protected function getHtmlForMenuItemList( $rawItemsHtml, $depth ) {
+		return call_user_func( $this->getItemListFormatter(), $rawItemsHtml, $depth );
+	}
+
+	/**
+	 * @return callable
+	 */
+	public function getItemListFormatter() {
+
+		if ( $this->itemListFormatter === null ) {
+			$this->setItemListFormatter( function ( $rawItemsHtml, $depth ) {
+				$indent = str_repeat( "\t", 2 * $depth + 1 );
+				return "$indent<ul>\n$rawItemsHtml$indent</ul>\n";
+			} );
+		}
+
+		return $this->itemListFormatter;
+	}
+
+	/**
+	 * @param callable $itemListFormatter
+	 */
+	public function setItemListFormatter( $itemListFormatter ) {
+		$this->itemListFormatter = $itemListFormatter;
+	}
+
+}