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+<?php
+
+use SMW\NamespaceManager;
+use SMW\ApplicationFactory;
+use SMW\Setup;
+
+/**
+ * @codeCoverageIgnore
+ *
+ * ExtensionRegistry only maps classes and functions after all extensions have
+ * been queued from the LocalSettings.php resulting in DefaultSettings not being
+ * loaded in-time.
+ *
+ * When changing the load order, please ensure that this function is run either
+ * via Composer's autoloading or as part of your internal registration.
+ */
+SemanticMediaWiki::load();
+
+/**
+ * @codeCoverageIgnore
+ *
+ * This documentation group collects source code files belonging to Semantic
+ * MediaWiki.
+ *
+ * For documenting extensions of SMW, please do not use groups starting with
+ * "SMW" but make your own groups instead. Browsing at
+ * https://doc.semantic-mediawiki.org/ is assumed to be easier this way.
+ *
+ * @defgroup SMW Semantic MediaWiki
+ */
+class SemanticMediaWiki {
+
+	/**
+	 * @since 2.5
+	 *
+	 * @note It is expected that this function is loaded before LocalSettings.php
+	 * to ensure that settings and global functions are available by the time
+	 * the extension is activated.
+	 */
+	public static function load() {
+
+		if ( is_readable( __DIR__ . '/vendor/autoload.php' ) ) {
+			include_once __DIR__ . '/vendor/autoload.php';
+		}
+
+		include_once __DIR__ . '/src/Aliases.php';
+		include_once __DIR__ . '/src/Defines.php';
+		include_once __DIR__ . '/src/GlobalFunctions.php';
+
+		// If the function is called more than once then this will fail on
+		// purpose
+		foreach ( include __DIR__ . '/DefaultSettings.php' as $key => $value ) {
+			if ( !isset( $GLOBALS[$key] ) ) {
+				$GLOBALS[$key] = $value;
+			}
+		}
+	}
+
+	/**
+	 * @since 2.4
+	 */
+	public static function initExtension( $credits = [] ) {
+
+		define( 'SMW_VERSION', isset( $credits['version'] ) ? $credits['version'] : 'N/A' );
+
+		// Registration point for required early registration
+		Setup::initExtension( $GLOBALS );
+	}
+
+	/**
+	 * Setup and initialization
+	 *
+	 * @note $wgExtensionFunctions variable is an array that stores
+	 * functions to be called after most of MediaWiki initialization
+	 * has finalized
+	 *
+	 * @see https://www.mediawiki.org/wiki/Manual:$wgExtensionFunctions
+	 *
+	 * @since  1.9
+	 */
+	public static function onExtensionFunction() {
+
+		$applicationFactory = ApplicationFactory::getInstance();
+
+		$namespace = new NamespaceManager();
+		$namespace->init( $GLOBALS );
+
+		$setup = new Setup( $applicationFactory );
+
+		$setup->loadSchema( $GLOBALS );
+		$setup->init( $GLOBALS, __DIR__ );
+	}
+
+	/**
+	 * @since 2.4
+	 *
+	 * @return string|null
+	 */
+	public static function getVersion() {
+
+		if ( !defined( 'SMW_VERSION' ) ) {
+			return null;
+		}
+
+		return SMW_VERSION;
+	}
+
+}