public Parser sizeModifier() {
        if (sizeModifierParser == null) {
           FutureParser future = scoped("sizeModifier");
           sizeModifierParser = future;
           future.setParser(
               sequence(
                   optional(
                       token("WITH")
                   ),
                   token("SIZE"),
                   choice(
                       identifier(),
                       integer()
                   )
               )
           );
        }

        return sizeModifierParser;
    }