[antlr-interest] Re: Request enhancement ANTLR
Terence Parr
parrt at jguru.com
Sat Sep 14 21:20:57 PDT 2002
I've added getFilename/setFilename methods (empty impl) to Token.java,
but I'm not sure about adding the ctor to NoViableAltException and the
code generator. Seems that now you'll get the filename but unless I
add real functionality to Token it will have a bogus default filename.
Hmm...plus, what about other exceptions? Seems I'd have to make wide
changes. I'll add the basic interface for now and see what happens I
guess.
Ok, in 2.7.2a3.
Thanks,
Ter
On Tuesday, June 25, 2002, at 09:12 AM, Dennis Marsa wrote:
> Silvain Piree wrote:
>>
>>> You're right that getFilename() may not return something
>>> useful, but it could return something indicating that the
>>> filename is not there, either an empty string, or "<no file>",
>>> or something.
>>
>> Sounds reasonable, but wouldn't it impact existing users,
>> who depend on the getFilename() behaviour?
>
> I don't think so.
>
> To be explicit, I'm suggesting adding a new NoViableAltException
> constructor. The existing two argument (token, filename) constructor
> could stay for compatibility reasons.
>
> public class NoViableAltException extends RecognitionException {
>
> // suggested new constructor
> public NoViableAltException(Token t) {
> super("NoViableAlt", t.getFilename(), t.getLine(),
> t.getColumn());
> token = t;
> }
>
> // existing constructor
> public NoViableAltException(Token t, String fileName_) {
> super("NoViableAlt", fileName_, t.getLine(), t.getColumn());
> token = t;
> }
>
> <remainder of class definition omitted for brevity>
> }
>
>
> But, it seems most NoViableAltException constructions are generated by
> ANTLR, so it could easily be updated to use the new single-argument
> constructor without impacting users.
>
> Any existing explicit NoViableAltException constructions made by the
> user would still get the two-argument version, but could be updated
> to use the single-argument version.
>
> Dennis
>
>
>
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>
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