[antlr-interest] Why doesn't this work?

[Indhu Bharathi]

Hi,

Any clue why this doesn't work? I'm still clueless.

- Indhu

Indhu Bharathi wrote:
> I was working in a big grammar and stumbled on a problem with 
> predicates. I've simplified the problem as much as possible and here it is:
>
> When I give the input "1.", I expect the tokens <INT_LIT, DOT>. But what 
> I get is "No viable alternative at character 'EOF'. I'm not able to 
> understand why this happens. Any pointers?
>
> grammar Test;
>
> r    :    INT_LIT DOT+
>     ;
>
> INT_FLOAT_PATTERN
>     :    (NUMBER DOT NUMBER LETTER ) => NUMBER DOT NUMBER LETTER
>         { $type=PATTERN; }
>        
>     |    ( NUMBER DOT NUMBER ) =>  NUMBER DOT NUMBER
>         { $type=FLOAT_LIT; }
>
>     |    (NUMBER) => NUMBER
>         { $type=INT_LIT; }
>
>     ;
>
> DOT    :    '.'
>     ;
>
> fragment PATTERN
>     :    ;
>    
> fragment FLOAT_LIT
>     :    ;
>    
> fragment INT_LIT
>     :    ;   
>
>    
> fragment
> NUMBER    :    ('0'..'9')+
>     ;
>
> fragment
> LETTER    :    'a'..'z'
>     ;
>    
>
> Thanks, Indhu
>
>
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