[antlr-interest] Inherit grammar and specify base scanner class at the same time

[Ric Klaren]

Hi,

On 1/25/06, Stanimir Stamenkov <stanio at myrealbox.com> wrote:
> /Stanimir Stamenkov/:
>
> > I've first tried
> > specifying the scanner class on the super grammar as:
> >
> > class SuperLexer extends Lexer("name.stanio.MyScanner");
> >
> > but the generated "MyLexer" was direct subclass of |antlr.CharScanner|
>
> I can't manage to make it whatever I'm trying. :-1  I run:
>
> antlr superlexer.g
> antlr -glib superlexer.g mylexer.g
>
> The generated "SuperLexer.java" extends |name.stanio.MyScanner| but
> "MyLexer.java" extends |antlr.CharScanner|, and if I specify:
>
> class MyLexer extends SuperLexer("name.stanio.MyScanner");
>
> the ANTLR tool reports an error. Could someone point me if it is a
> FAQ or well documented feature as I haven't been able to find more
> info on it.

I would not be surprised if this is a bug. The inheritance thing isn't
the prettiest in the world. If you have to add/change a lot of action
code in the sub grammar then it's usually pretty much useless anyway.
(although some people seem to be happy with using it)

Cheers,

Ric