[antlr-interest] Please advice about float

[Bryan Ewbank]

Yes, and that works too; because I write in C++, I avoid "=>"
predicates because they incur a thrown exception - very expensive in
C++ - and in this case you don't really need it.

For java, I understand exceptions are not expensive, so this would
perhaps work as well.

On 9/19/05, Mark Kattenbelt <mark.kattenbelt at gmail.com> wrote:
> My solution:
> 
> REAL_OR_INT
>     : ( INT '.' ) => REAL { $setType(REAL); }
>     | ('-' INT '.' ) => REAL { $setType(REAL); }
>     | INT { $setType(INT); }
>     ;
> 
> protected INT options { paraphrase = "a constant integer"; }
>     : ('0' .. '9')+
>     ;
> 
> protected REAL options { paraphrase = "a floating point value"; }
>     : ('-')? INT '.' INT
>     ;
> 
> Hope it helps,
> 
> Mark Kattenbelt