[antlr-interest] throwing non-antlr exceptions

[Joachim Schrod]

Joe Lemmer wrote:
> 
> I'd like to throw a Non-Antlr exception from one of my rules in a Parser. I'm using ANTLR v3
> I've tried to find some documentation and came across some stuff for ANTLR v2 that says the following:
> 
> To specify that your parser (or
> tree parser rule) can throw a non-ANTLR specific exception, use the
> exceptions clause.  For example, here is a simple parser specification
> with a rule that throws MyException:
> 
> class P extends Parser;
> 
> a throws MyException
>   : A
>   ;

The "throws" keyword in a grammar (currently) has no effect.
(I don't know if that worked in v2, it doesn't in v3.)

There is no possibility to add a checked exception to a rule.
You must use RuntimeExceptions.

	Joachim

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Joachim Schrod				Email: jschrod at acm.org
Roedermark, Germany