public Parser decimalIsComma() {
        if (decimalIsCommaParser == null) {
           FutureParser future = scoped("decimalIsComma");
           decimalIsCommaParser = future;
           future.setParser(
               sequence(
                   token("DECIMAL-POINT"),
                   optional(
                       token("IS")
                   ),
                   token("COMMA")
               )
           );
        }

        return decimalIsCommaParser;
    }