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Re: FYI: default %printer/%destructor
From: |
Paul Eggert |
Subject: |
Re: FYI: default %printer/%destructor |
Date: |
Thu, 23 Nov 2006 00:47:09 -0800 |
User-agent: |
Gnus/5.1008 (Gnus v5.10.8) Emacs/21.4 (gnu/linux) |
"Joel E. Denny" <address@hidden> writes:
> Sorry, I have no experience with ML. Would you should me how this might
> look in a Bison rule?
Not offhand. C isn't ML, and we'd have to construct types or
something like that. It'd take some thinking. But the basic idea is
that the EBNF X* has type "list of whatever X returns", and X? maps to
"either an X-type value, or a null pointer".
> Maybe it's just me, but I prefer Hans' suggestion:
>
> exp/sum: exp/term1 '+' exp/term2
>
> over
>
> exp#sum: exp#term1 '+' exp#term2
>
> I can't think of any semantic reason to prefer one over the other. The
> slash is just a little easier on my eyes.
I think "/" bugs me because it means "or" in ABNF, which is the
standard grammatical notation used in Internet RFCs; see
<http://www.ietf.org/rfc/rfc4234>. I could live with "/",
I suppose.
> I don't much like the `-' to mean nothing. I had originally suggested `!'
> instead, but I found a reason why I don't like it either, and that reason
> also applies to `-'. This one post might help you catch up:
>
> http://lists.gnu.org/archive/html/bison-patches/2006-11/msg00039.html
Sorry, I don't follow the argument there. How does it apply to "/"
(or "#" or whatever)?
- Re: FYI: default %printer/%destructor, (continued)
- Re: FYI: default %printer/%destructor, Joel E. Denny, 2006/11/21
- Re: FYI: default %printer/%destructor, Paul Eggert, 2006/11/21
- Re: FYI: default %printer/%destructor, Joel E. Denny, 2006/11/21
- Re: FYI: default %printer/%destructor, Joel E. Denny, 2006/11/21
- Re: FYI: default %printer/%destructor, Paul Eggert, 2006/11/22
- Re: FYI: default %printer/%destructor, Hans Aberg, 2006/11/22
- Re: FYI: default %printer/%destructor, Hans Aberg, 2006/11/22
- Re: FYI: default %printer/%destructor, Paul Eggert, 2006/11/22
- Re: FYI: default %printer/%destructor, Hans Aberg, 2006/11/24
- Re: FYI: default %printer/%destructor, Joel E. Denny, 2006/11/23
- Re: FYI: default %printer/%destructor,
Paul Eggert <=
- Re: FYI: default %printer/%destructor, Joel E. Denny, 2006/11/24
- Re: FYI: default %printer/%destructor, Paul Eggert, 2006/11/24
- Re: FYI: default %printer/%destructor, Joel E. Denny, 2006/11/24
- Re: FYI: default %printer/%destructor, Joel E. Denny, 2006/11/24
- Re: FYI: default %printer/%destructor, Hans Aberg, 2006/11/24
- Re: FYI: default %printer/%destructor, Joel E. Denny, 2006/11/24
- Re: FYI: default %printer/%destructor, Hans Aberg, 2006/11/25
- Re: FYI: default %printer/%destructor, Hans Aberg, 2006/11/25
- Re: FYI: default %printer/%destructor, Hans Aberg, 2006/11/25
- Re: FYI: default %printer/%destructor, Hans Aberg, 2006/11/25