From: skaller <skaller@users.sourceforge.net>
To: Luc Maranget <luc.maranget@inria.fr>
Cc: Diego Olivier Fernandez Pons <Diego.FERNANDEZ_PONS@etu.upmc.fr>,
caml-list <caml-list@inria.fr>
Subject: Re: [Caml-list] Need NFA/DFA conversion help
Date: 16 Sep 2004 23:29:11 +1000 [thread overview]
Message-ID: <1095341350.27775.1237.camel@pelican.wigram> (raw)
In-Reply-To: <20040916120724.GB16633@yquem.inria.fr>
On Thu, 2004-09-16 at 22:07, Luc Maranget wrote:
> > > What doesn't work is sub-group matching, look ahead, etc -- things
> > > requiring actions in the middle of a regexp (rather than at the
> > > end).
> >
> > textbook say. They do not accept rational or context-free languages,
> > they do not use DFA, NFA or LR(k) automata as claimed.
> >
>
> Perhaps I should make my previous post (on the theoretic side of ocamllex)
> a bit more precise.
>
> The cited articles relate to << sub-group matching >> in DFA implementation
> of regexp matching.
>
> The proposed technique is an extension of the Dragon-Book technique
> (Glukov ?)
I have read the Laurikari article and it describes the kind
of thing I was looking for. It provides a mathematical formalism
for Tagged NFAs and gives an modification of the subset
construction which handles determinising such TNFAs.
I think this gives all the functionality of lex
and Str/PCRE together (except for back references).
That seems a reasonable goal for a first release
because it can simplify the life or ordinary
programmers as well as compiler implementors.
Perhaps more expressive automata will follow
(as well as performance improvements :)
--
John Skaller, mailto:skaller@users.sf.net
voice: 061-2-9660-0850,
snail: PO BOX 401 Glebe NSW 2037 Australia
Checkout the Felix programming language http://felix.sf.net
-------------------
To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr
Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/
Beginner's list: http://groups.yahoo.com/group/ocaml_beginners
next prev parent reply other threads:[~2004-09-16 13:29 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-15 15:05 skaller
2004-09-15 15:41 ` Luc Maranget
2004-09-15 19:15 ` Alain Frisch
2004-09-15 17:50 ` Jason Hickey
2004-09-15 20:50 ` Jason Hickey
2004-09-15 23:35 ` skaller
2004-09-16 11:50 ` Diego Olivier Fernandez Pons
2004-09-16 12:07 ` Luc Maranget
2004-09-16 12:37 ` james woodyatt
2004-09-16 13:29 ` skaller [this message]
2004-09-16 12:57 ` skaller
2004-09-16 13:04 ` Diego Olivier Fernandez Pons
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1095341350.27775.1237.camel@pelican.wigram \
--to=skaller@users.sourceforge.net \
--cc=Diego.FERNANDEZ_PONS@etu.upmc.fr \
--cc=caml-list@inria.fr \
--cc=luc.maranget@inria.fr \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).