From: Jason Hickey <jyh@cs.caltech.edu>
To: skaller@users.sourceforge.net, caml-list@inria.fr
Subject: Re: [Caml-list] Need NFA/DFA conversion help
Date: Wed, 15 Sep 2004 13:50:48 -0700 [thread overview]
Message-ID: <4148AB28.9090706@cs.caltech.edu> (raw)
In-Reply-To: <1095260758.27775.1047.camel@pelican.wigram>
skaller wrote:
> I need some help understanding how to convert
> an NFA with *labelled* arcs into an equivalent DFA.
> I'm not even sure it is possible. Any advice,
> pointers to papers, or code appreciated. The main
> use will be in a set of regexp related tools intended
> to replace Ocamllex, Str, and PCRE with pure caml code,
> and then extend that with an RTN based parsing system.
You might consider looking at the Mojave lexer--probably the easiest way
to get it is to download the omake sources at http://omake.metaprl.org,
and look at the file lm_lexer.{ml,mli}. It is pure OCaml code, and
provides a tiny bit more functionality than ocamllex, but lexer
construction is online.
There is also a stub for (re)defining the Str functions in terms of
Lexer functions, but it is incomplete at the moment.
The regular expressions are egrep/awk style. The lexer compiles regex
-> NFA -> DFA, but the DFA step is lazy--it is constructed as the input
is scanned. Documentation for the regular expression syntax is under
the omake documentation page
http://cvs.metaprl.org:12000/omake/omake.html#section_171
Jason
--
Jason Hickey http://www.cs.caltech.edu/~jyh
Caltech Computer Science Tel: 626-395-6568 FAX: 626-792-4257
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next prev parent reply other threads:[~2004-09-15 20:54 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 [this message]
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
2004-09-16 12:57 ` skaller
2004-09-16 13:04 ` Diego Olivier Fernandez Pons
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