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Re: Bison and LR(1) Parsers

From: Hans Aberg
Subject: Re: Bison and LR(1) Parsers
Date: Tue, 3 Jul 2001 12:15:57 +0200

At 12:49 +1000 2001/07/03, address@hidden wrote:
>By the way - there is a bug on the bison web page - the person listed as
>maintainer denies being the maintainer any more.
>Who is the official maintainer?

I think this is Akim Demaille <address@hidden>.

>All your comments make sense. I am just about to go off and get a copy fo the
>Fortes paper. I did a search and he doesn't seem to have patented it though

The only one that seems to have a copy is Carlos Borges <address@hidden>,
I have not heard from him for a while. So I do not know about much about
DR. Also, I suspect that it will be Carlos' thesis work or something, so he
will probably not be too happy if you mess with that.

>there are patents in the LR parser space, notably from IBM.
>I will await an official verdict before writing anything.

I wonder in what sense these algorithms differ: Is it not just how one is
able to merge together the states in the state-machine that executes the

>The bison.simple also puts out some warnings when run with gcc in pedantic
>- comparison of "signed and unsigned". Would someone like a patch for this? I
>have already patched the version on my system as I build gcc all the time and
>the messages annoyed me.

Hope somebody else answers that (Akim perhaps): I have not used that feature.

>I also have another question - is there anywhere I can download the latest cvs
>version or whatever? I don't want to make a lot of patches to an obsolete

  Flex: ftp://ftp.digital.com/pub/GNU/non-gnu/flex/flex-2.5.4a.tar.gz
  Bison: ftp://alpha.gnu.org/gnu/cvs/

  Hans Aberg

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