public Parser onEscape() {
        if (onEscapeParser == null) {
           FutureParser future = scoped("onEscape");
           onEscapeParser = future;
           future.setParser(
               sequence(
                   optional(
                       token("ON")
                   ),
                   token("ESCAPE"),
                   nestedStatements()
               )
           );
        }

        return onEscapeParser;
    }