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Re: 01-ere-layout.patch
From: |
Gary V. Vaughan |
Subject: |
Re: 01-ere-layout.patch |
Date: |
Fri, 28 Sep 2001 23:36:57 +0100 |
User-agent: |
Mutt/1.3.22.1i |
On Thu, Sep 27, 2001 at 11:07:15AM +0200, Akim Demaille wrote:
>
> This is a proposal to have, some day, ERE support in GNU M4. I'd
> really love to have it in 1.5... I still don't know what will be the
> preferred interface. I'm aiming at patsubst, epatsubst, regexp,
> eregexp. ?
Looks great. Feel free to commit (along with some tests and
documentation!).
> Note that I no longer try to free the memory used by Regex, because it
> does it for us. In particular, now, it can reuse its buffers. Better
> yet, sometimes it can find out it doesn't have to recompile a pattern
> (ISTR they perform such optimizations.
Really? Great. Is this in the regex.c we are using right now? I am
not sure where the canonical version lives, otherwise I would update
M4's copy and take a look at the docs... any clues?
> And if they don't, maybe we
> should implement a cache? Autoconf uses regexp quite a lot, but with
> a small number of RE).
I'm reluctant to put regex caching into M4, it seems like something
that belongs in regex.c. We need to find a canonical version that we
can submit patches against. Or at worst, I guess we could have an
m4_regex.c wrapper API that does caching, if it turns out to be
necessary when we find out how the canonical version behaves...
Cheers,
Gary.
--
())_. Gary V. Vaughan gary@(oranda.demon.co.uk|gnu.org)
( '/ Research Scientist http://www.oranda.demon.co.uk ,_())____
/ )= GNU Hacker http://www.gnu.org/software/libtool \' `&
`(_~)_ Tech' Author http://sources.redhat.com/autobook =`---d__/