public Parser reversePhrase() {
        if (reversePhraseParser == null) {
           FutureParser future = scoped("reversePhrase");
           reversePhraseParser = future;
           future.setParser(
               choice(
                   token("REVERSE"),
                   token("REVERSED"),
                   token("REVERSE-VIDEO")
               )
           );
        }

        return reversePhraseParser;
    }