[antlr-interest] A rule indirecting a token

[Benjamin Niemann]

Hello,

Joachim Rosskopf wrote:

> I´m very new to development with antlr and dsl development in general.
> 
> Currently I´m trying to implement a kind of expression language for a
> data
> converstion tool. But I´m facing a problem I really don´t understand.
> 
> Take the following snippet of my grammar:
> 
> decimalDigit
>         :       DIGIT;
> 
> DIGIT   :       ('0'..'9');
> 
> I´m using ANTLRWorks to interpret the grammar. So "DIGIT" works quite
> well. But if i try "decimalDigit" I get an MismatchedTokenException
> (13 != 14). What´s wrong, and what the heck does 13 != 14 mean?

There must be another lexer rule that also matches a digit. 13 is the token
type of the recognized token and 14 the type of DIGIT. Look at the
generated <T>.tokens file to find out which rule has type 13.

If you still have trouble finding the cause, post the complete grammar (or
better a minimal but complete version demonstrating the behaviour).


HTH

-- 
Benjamin Niemann
Email: pink at odahoda dot de
WWW: http://pink.odahoda.de/