+ /**
+ * Extracts the parameter type and preprocessed the value if needed.
+ * @param $param String|Array: Parameter as defined in this class.
+ * @return Tuple(type, value)
+ * @throws MWException
+ */
+ protected function extractParam( $param ) {
+ if ( is_array( $param ) && isset( $param['raw'] ) ) {
+ return array( 'after', $param['raw'] );
+ } elseif ( is_array( $param ) && isset( $param['num'] ) ) {
+ // Replace number params always in before step for now.
+ // No support for combined raw and num params
+ return array( 'before', $this->language->formatNum( $param['num'] ) );
+ } elseif ( !is_array( $param ) ) {
+ return array( 'before', $param );
+ } else {
+ throw new MWException( "Invalid message parameter" );
+ }
+ }
+