if ( $wgScribuntoUseGeSHi && $language ) {
			$geshi = SyntaxHighlight_GeSHi::prepare( $text, $language );
			$geshi->set_language( $language );
			if ( $geshi instanceof GeSHi && !$geshi->error() ) {
				$code = $geshi->parse_code();
				if ( $code ) {
					// @todo Once we drop support for old versions of
					// Extension:SyntaxHighlight_GeSHi, drop the ugly test and
					// the BC case.
					global $wgAutoloadClasses;
					if ( isset( $wgAutoloadClasses['ResourceLoaderGeSHiModule'] ) ) {
						$output->addModuleStyles( "ext.geshi.language.$language" );
					} else {
						// Backwards compatibility
						$output->addHeadItem( SyntaxHighlight_GeSHi::buildHeadItem( $geshi ), "source-{$language}" );
					}
					if ( $wgUseSiteCss ) {
						$output->addModuleStyles( 'ext.geshi.local' );
					}
					$output->setText( self::getPOText( $output ) . $code );
					return $output;
				}
			}
		}