Re: [Caml-list] Extending Format strings

[Jeremie Dimino <jdimino@janestreet.com>]

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On Tue, Jul 1, 2014 at 10:59 AM, Gabriel Kerneis <gabriel@kerneis.info>
wrote:

> Dear all,
>
> in CIL <http://cil.sf.net>, the module Pretty provides a Format-like
> interface with a few extensions compared to usual format strings.
> Implementation-wise, it uses string_of_format and re-implements most of
> the logic of the pre-4.02 Format module, with Obj.magic all over the
> place.
>
> I wondered if anyone has done something similar in their own project
> (extending Format in one way or another), and if the new GADT-based
> approach could provide a cleaner solution?
>
> One thing I quite like with the current code, despite its uglyness, is
> its concision. I am right in assuming that switching to GADTs would
> require a lot more boilerplate?
>

I had a quick look at [Pretty.dprintf] and I think you could use
[CamlinternalFormat.make_printf] to implement it with 4.02. @-sequences are
already recognized by the format parser in the compiler, but it should be
compatible with [Pretty]'s syntax, you just have to interpret the
constructors differently. It should actually make the code of
[Pretty.dprintf] much simpler.

-- 
Jeremie

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