[Caml-list] Pickling for OCaml?

[Caml-list] Pickling for OCaml?

[Jonathan Roewen]

Hi,

Has anyone done a pickling library for O'Caml yet?

Kindest Regards,

Jonathan

Re: [Caml-list] Pickling for OCaml?

[Erik de Castro Lopo]

Jonathan Roewen wrote:

> Hi,
> 
> Has anyone done a pickling library for O'Caml yet?

Will the Marshall module not do?

Erik
-- 
+-----------------------------------------------------------+
  Erik de Castro Lopo
+-----------------------------------------------------------+
Pastafarianism : http://www.venganza.org/
The intelligent alternative to 'Intelligent Design'.

Re: [Caml-list] Pickling for OCaml?

[Jonathan Roewen]

> Will the Marshall module not do?

Marshal is unsafe. Pickling is safe. I'd take pickling =)

Re: [Caml-list] Pickling for OCaml?

[Markus Mottl]

On 1/6/06, Jonathan Roewen <jonathan.roewen@gmail.com> wrote:
> > Will the Marshall module not do?
>
> Marshal is unsafe. Pickling is safe. I'd take pickling =)

You could try our S-expression library, which uses CamlP4 to generate
code for converting arbitrary extensionally defined (= sum and product
types, polymorphic variants, records, types with type variables)
OCaml-types to and from S-expressions:

  http://www.janestcapital.com/ocaml

The library is safe and displays understandable error messages when
parsing S-expressions.  One can choose whether to print values in
human-readable ways or in very compact machine-readable (somewhat
human-readable) form.  It's also very easy to write down OCaml-values
in S-expression syntax, which makes it ideal for complex configuration
files.

Regards,
Markus

--
Markus Mottl        http://www.ocaml.info        markus.mottl@gmail.com

Re: [Caml-list] Pickling for OCaml?

[David MENTRE]

Hello,

2006/1/6, Jonathan Roewen <jonathan.roewen@gmail.com>:
> Has anyone done a pickling library for O'Caml yet?

What does mean "pickling"?

Best wishes,
d.

Re: [Caml-list] Pickling for OCaml?

[Alessandro Baretta]

Jonathan Roewen wrote:
>>Will the Marshall module not do?
> 
> 
> Marshal is unsafe. Pickling is safe. I'd take pickling =)

Marshalling and "pickling" are synonyms. The Marshal module does not provide 
runtime checks, yet, but the Caml team is working at it, as far as I know.

Alex

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Re: [Caml-list] Pickling for OCaml?

[Mark Shinwell]

On Fri, Jan 06, 2006 at 04:36:34PM +0100, Alessandro Baretta wrote:
> Jonathan Roewen wrote:
> >>Will the Marshall module not do?
> >
> >
> >Marshal is unsafe. Pickling is safe. I'd take pickling =)
> 
> Marshalling and "pickling" are synonyms. The Marshal module does not 
> provide runtime checks, yet, but the Caml team is working at it, as far as 
> I know.

Myself and others at Cambridge, headed by Peter Sewell, are working on
type- and abstraction-safe marshalling for O'Caml that works even where
values to be marshalled are passed through polymorphic functions.
Expect to hear more later this year.

Mark

Re: [Caml-list] Pickling for OCaml?

[Jonathan Roewen]

> > Marshalling and "pickling" are synonyms. The Marshal module does not
> > provide runtime checks, yet, but the Caml team is working at it, as far as
> > I know.
>
> Myself and others at Cambridge, headed by Peter Sewell, are working on
> type- and abstraction-safe marshalling for O'Caml that works even where
> values to be marshalled are passed through polymorphic functions.
> Expect to hear more later this year.

Well, in the meantime, we've ported most of the pickling library from
SML.NET to work with O'Caml. Supports most of the basic types
(int,bool,char,string,list,array,unit,pairs->sextuples) and a few
combinators (alttag, wrap, lift,seq).

Fairly easy to define a pickler:

module BytePickle = Pickle.CorePickle(Pickle.ByteCodec)
open BytePickle

let pickler = pair (string list,int)

let data = pickle pickler (["hello";"world"],-1)

let value = unpickle pickler (List.rev data)

Files at http://devnulled.ath.cx/svn/dst/kernel/pickle.ml &
http://devnulled.ath.cx/svn/dst/kernel/pickle.mli

Kindest Regards,

Jonathan

Re: [Caml-list] Pickling for OCaml?

[Jonathan Roewen]

Oops, URLs are wrong =(

Files at http://devnulled.ath.cx/svn/dst/trunk/kernel/pickle.ml &
http://devnulled.ath.cx/svn/dst/trunk/kernel/pickle.mli

> Well, in the meantime, we've ported most of the pickling library from
> SML.NET to work with O'Caml. Supports most of the basic types
> (int,bool,char,string,list,array,unit,pairs->sextuples) and a few
> combinators (alttag, wrap, lift,seq).
>
> Fairly easy to define a pickler:
>
> module BytePickle = Pickle.CorePickle(Pickle.ByteCodec)
> open BytePickle
>
> let pickler = pair (string list,int)
>
> let data = pickle pickler (["hello";"world"],-1)
>
> let value = unpickle pickler (List.rev data)
>
> Files at http://devnulled.ath.cx/svn/dst/kernel/pickle.ml &
> http://devnulled.ath.cx/svn/dst/kernel/pickle.mli
>
> Kindest Regards,
>
> Jonathan
>

Re: [Caml-list] Pickling for OCaml?

[Alessandro Baretta]

Jonathan Roewen wrote:

> let pickler = pair (string list,int)
> 
> let data = pickle pickler (["hello";"world"],-1)
> 
> let value = unpickle pickler (List.rev data)

Neat trick!

Alex

-- 
*********************************************************************
http://www.barettadeit.com/
Baretta DE&IT
A division of Baretta SRL

tel. +39 02 370 111 55
fax. +39 02 370 111 54

Our technology:

The Application System/Xcaml (AS/Xcaml)
<http://www.asxcaml.org/>

The FreerP Project
<http://www.freerp.org/>