On 23 Nov 2006, at 09:47, Paul Eggert wrote:
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>.
As for BNF extensions, I think Bison will have to get its own
variation. These standards where cooked up with other objectives in
mind.
I could live with "/",
I suppose.
I think "/" could be used in math, but one is there used to overload
symbols. I thought at first "#" might look to heavy, but in the
calculator example, it looks fine. And "#" is used in TeX i onccetion
with variables.
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)?
And when I tried to look, the server was down.
Hans Aberg
