Marwan Ajraoui wrote: > Hi There; > > I'm currently defining a grammar for a based tag language using ANTLR; > The problem I'm facing is that a single digit doesn't match my defined > rule INTEGER, here is the definition I put (as i saw in The Definitive > guide of ANTLR): > > DIGITO: '0'..'9' ; > INT : DIGITO + ; > > This rule should match any digit, but does match only numbers that are > composed of tow or more digits, like 45, 0567, etc. Numbers as 0, 7 or > 5 doesn't match. > > I will be gratefull, if you give me any issue about it; > You probably are best reading through the example grammars to get a full understanding, but here both of your lexer rules can match digits so the best ANTLR can do is realize that INT is selected when there are more than one DIGITs because DIGIT0 can only match 1 digit.
You cannot have two rules that match the same thing basically. When you want to use a rule as sort of 'subroutine' that does not create any tokens itself, then you need to mark it as a fragment. Then it will generate code that can be called by other rules but will not try and create tokens itself. fragment DIGITO: '0'..'9' ; INT : DIGITO + ; Jim List: http://www.antlr.org/mailman/listinfo/antlr-interest Unsubscribe: http://www.antlr.org/mailman/options/antlr-interest/your-email-address --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "il-antlr-interest" group. To post to this group, send email to il-antlr-interest@googlegroups.com To unsubscribe from this group, send email to il-antlr-interest+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/il-antlr-interest?hl=en -~----------~----~----~----~------~----~------~--~---
