public Parser modeIsBlockPhrase() {
        if (modeIsBlockPhraseParser == null) {
           FutureParser future = scoped("modeIsBlockPhrase");
           modeIsBlockPhraseParser = future;
           future.setParser(
               sequence(
                   token("MODE"),
                   optional(
                       token("IS")
                   ),
                   token("BLOCK")
               )
           );
        }

        return modeIsBlockPhraseParser;
    }