From: Jonathan Bryant <jtbryant@valdosta.edu>
To: Brian Hurt <bhurt@janestcapital.com>
Cc: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] The Implicit Accumulator: a design pattern using optional arguments
Date: Wed, 27 Jun 2007 16:17:09 -0400 [thread overview]
Message-ID: <2F62C393-2EE0-470F-9781-E85B855201B6@valdosta.edu> (raw)
In-Reply-To: <4682AD06.9080008@janestcapital.com>
On Jun 27, 2007, at 2:31 PM, Brian Hurt wrote:
> Actually, what I'd like is a more powerful regular expression engine-
This is off the top of my head, but I've always thought it would be
nice to have built-in regexps using a Scanf style. Instead of using
$1, $2 (or \1, \2, depending on your language), have each
parenthesized argument be passed to a function, and the whole thing
is a function of a string parameter. If a scanf conversion is used,
that is the type passed to the function, otherwise it's simply passed
as a string. Something like:
# let re = /(foo|bar|baz)/ (fun x -> match x with | "foo" -> ...
etc ... );;
re : string -> 'a = <fun>
# let simple_phone_number = /(%d)-(%d)-(%d)/ (fun x y z -> (x,y,z) );;
simple_phone_number : string -> (int * int * int) = <fun>
I don't know how hard this would be to implement. It would require
some scanf style compiler magic, but it overcomes scanf's shortcoming
that it doesn't allow character classes. It might even be possible
for use in pattern matching:
# let f str = match str with
| /foo/ -> (* It's a foo *)
| /bar/ -> (* It's a bar *)
| /baz/ -> (* It's a baz *)
| /(%d)-(%d)-(%d)/ -> (* It's a phone number *)
| _ -> (* Not matched *)
;;
f : string -> 'a = <fun>
Any idea how hard this would be?
--Jonathan
next prev parent reply other threads:[~2007-06-27 20:17 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-27 12:14 Jon Harrop
2007-06-27 13:18 ` [Caml-list] " Quôc Peyrot
2007-06-27 13:53 ` Jon Harrop
2007-06-27 14:18 ` Thomas Fischbacher
2007-06-27 15:09 ` Quôc Peyrot
2007-06-27 15:28 ` Mattias Engdegård
2007-06-27 15:38 ` Robert Fischer
2007-06-27 15:48 ` Mattias Engdegård
2007-06-27 16:01 ` Robert Fischer
2007-06-27 16:01 ` Mattias Engdegård
2007-06-27 18:06 ` Jon Harrop
2007-06-27 18:31 ` Brian Hurt
2007-06-27 19:56 ` skaller
2007-06-27 20:17 ` Jonathan Bryant [this message]
2007-06-27 22:57 ` Jon Harrop
2007-06-27 16:53 ` Hash-consing (was Re: [Caml-list] The Implicit Accumulator: a design pattern using optional arguments) Daniel Bünzli
2007-06-30 8:19 ` [Caml-list] The Implicit Accumulator: a design pattern using optional arguments Pierre Etchemaïté
2007-06-27 13:55 ` Thomas Fischbacher
2007-06-27 15:06 ` Quôc Peyrot
2007-06-27 15:53 ` Jon Harrop
2007-06-28 11:01 ` Thomas Fischbacher
2007-06-28 11:32 ` Jon Harrop
2007-06-28 11:42 ` Joel Reymont
2007-06-28 12:08 ` Jon Harrop
2007-06-28 13:10 ` Quôc Peyrot
2007-06-28 13:35 ` Thomas Fischbacher
2007-06-28 12:59 ` Thomas Fischbacher
2007-06-28 13:05 ` Jon Harrop
2007-06-28 13:33 ` Thomas Fischbacher
2007-06-28 14:43 ` Jon Harrop
2007-06-28 16:01 ` Thomas Fischbacher
2007-06-28 17:53 ` Jon Harrop
2007-06-27 16:39 ` Thomas Fischbacher
2007-06-27 19:26 ` Quôc Peyrot
2007-06-28 11:39 ` Thomas Fischbacher
2007-06-28 14:44 ` Jon Harrop
2007-06-28 16:03 ` Thomas Fischbacher
2007-06-28 17:20 ` Dirk Thierbach
2007-06-28 22:12 ` Thomas Fischbacher
2007-06-29 1:10 ` Jon Harrop
2007-06-29 10:55 ` Thomas Fischbacher
2007-06-29 6:12 ` Dirk Thierbach
2007-06-27 17:16 ` Book about functional design patterns Gabriel Kerneis
2007-06-27 17:48 ` [Caml-list] " Jon Harrop
2007-06-27 19:33 ` Quôc Peyrot
2007-06-27 19:30 ` Quôc Peyrot
2007-06-27 19:48 ` Brian Hurt
2007-06-27 20:04 ` Quôc Peyrot
2007-06-27 20:35 ` Brian Hurt
2007-06-27 20:55 ` Quôc Peyrot
2007-06-27 20:58 ` Pal-Kristian Engstad
2007-06-27 21:18 ` Quôc Peyrot
2007-06-27 21:18 ` Pal-Kristian Engstad
2007-06-27 21:34 ` Quôc Peyrot
2007-06-27 22:13 ` Pal-Kristian Engstad
2007-06-27 15:18 ` [Caml-list] The Implicit Accumulator: a design pattern using optional arguments Jon Harrop
2007-06-27 16:44 ` Thomas Fischbacher
2007-06-27 18:17 ` Jon Harrop
2007-06-28 11:18 ` Thomas Fischbacher
2007-06-29 13:15 ` Bill Wood
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