Re: [9fans] all you yacc experts

[David Leimbach <leimy2k@gmail.com>]

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Pretty cool!

On Tue, Nov 15, 2011 at 1:10 PM, Anthony Martin <ality@pbrane.org> wrote:

> Attached is a modified version of p9p yacc that
> supports the Go grammar.  I'll be sending a
> version of Plan 9 yacc later today.
>
> The following is a description of the changes.
>
>  1. The %error-verbose directive is ignored.
>
>  2. A description of the final grammar is
>     printed before the state descriptions
>         in y.output.
>
>  3. The 'x' format for character literals is
>     now used instead of prefixing with a space.
>
>  4. The YYEMPTY define is now used to clear
>     the lookahead token (instead of an explicit
>         negative one).
>
>  5. Make yychar and yystate globals so they
>     can be inspected by external code.
>
>  5. Support C++ style // comments in actions.
>
>  6. Add a usage message.
>
>  7. Fix a few uses of sprint and strcpy.
>
>
> I've also sent out a changeset to the Go
> development list which adds support for
> using Plan 9 yacc to generate the special
> errors.
>
> One tiny nit is that Plan 9 uses the name
> yytoknames for debugging where Bison uses
> yytname.  I've just used sed for this.
>
> Any questions?
>   Anthony
>

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