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diff --git a/includes/context/IContextSource.php b/includes/context/IContextSource.php
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+<?php
+/**
+ * Request-dependant objects containers.
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @since 1.18
+ *
+ * @author Happy-melon
+ * @file
+ */
+
+/**
+ * Interface for objects which can provide a context on request.
+ */
+interface IContextSource {
+
+	/**
+	 * Get the WebRequest object
+	 *
+	 * @return WebRequest
+	 */
+	public function getRequest();
+
+	/**
+	 * Get the Title object
+	 *
+	 * @return Title
+	 */
+	public function getTitle();
+
+	/**
+	 * Check whether a WikiPage object can be get with getWikiPage().
+	 * Callers should expect that an exception is thrown from getWikiPage()
+	 * if this method returns false.
+	 *
+	 * @since 1.19
+	 * @return bool
+	 */
+	public function canUseWikiPage();
+
+	/**
+	 * Get the WikiPage object.
+	 * May throw an exception if there's no Title object set or the Title object
+	 * belongs to a special namespace that doesn't have WikiPage, so use first
+	 * canUseWikiPage() to check whether this method can be called safely.
+	 *
+	 * @since 1.19
+	 * @return WikiPage
+	 */
+	public function getWikiPage();
+
+	/**
+	 * Get the OutputPage object
+	 *
+	 * @return OutputPage object
+	 */
+	public function getOutput();
+
+	/**
+	 * Get the User object
+	 *
+	 * @return User
+	 */
+	public function getUser();
+
+	/**
+	 * Get the Language object
+	 *
+	 * @deprecated 1.19 Use getLanguage instead
+	 * @return Language
+	 */
+	public function getLang();
+
+	/**
+	 * Get the Language object
+	 *
+	 * @return Language
+	 * @since 1.19
+	 */
+	public function getLanguage();
+
+	/**
+	 * Get the Skin object
+	 *
+	 * @return Skin
+	 */
+	public function getSkin();
+
+	/**
+	 * Get a Message object with context set
+	 *
+	 * @return Message object
+	 */
+	public function msg();
+}
+