Re: Customizing display of tokens(%print?)

[Hans Aberg]

On 1 Jun 2007, at 14:49, Frans Englich wrote:

> When Bison prints error messages for symbols, it doesn't take into  
> account
> possible semantic values. For instance, it says "unexpected <literal>,
> expected foo".
>
> What would be much more helpful is if it printed the semantic  
> values instead.
> For instance, "123" instead of "<literal>" and "myVariable" instead of
> "<identifier>".
>
> I first thought that the %print-feature, mysteriously used in  
> examples but not
> documented, did this. But it's a whole feature for the purpose of
> improving... /debug/ output?
>
> Is there any way to register code for printing helpful token  
> descriptions?
>
> (Yes, there is %token name "string" when it is known statically.)

I think that better error reporting is on the todo list, but for now,  
one can tweak the skeleton file.

  Hans Aberg