public Parser localeIs() {
        if (localeIsParser == null) {
           FutureParser future = scoped("localeIs");
           localeIsParser = future;
           future.setParser(
               sequence(
                   token("LOCALE"),
                   identifier(),
                   optional(
                       token("IS")
                   ),
                   identifier()
               )
           );
        }

        return localeIsParser;
    }