[Caml-list] Camlp4-free implementation of stream parsers (was camlp4 & OCaml 4.08)

["Jocelyn Sérot" <jocelyn.serot@uca.fr>]

Hi Daniil (and everyone interested by the subject),

Did you have a closer look at this ? 

I’m still hesitating between these three approaches for replacing the implementation of the small arithm expression parser used in Lascar [1] :

i. rewrite it using the basic fns provided by the Stream library (pro: no additionnal dependency, cons: not so trivial..)

ii. replace camlp4 by camlp5 (pro: straightforward, cons: long term maintainability of camlp5 (?)) 

iii. rewrite it using ocamlex/menhir and embed it in the main code (pro: « standard » soon; cons: a bit heavy)

Jocelyn

[1] https://github.com/jserot/lascar/blob/master/src/lib/fsm_expr.ml, lines 70–112

Le 2 juil. 2019 à 11:25, Daniil Baturin <daniil@baturin.org> a écrit :

> Hi Jocelyn,
> Camlp5 is still sort of maintained, but I don't think it's going to be
> developed beyond compatibility updates.
> For syntax extensions, everyone is switching to PPX.
> 
> From a quick look, it seems like the only bit of camlp4 you use is
> stream expressions.
> This is one of the things PPX can't do (on purpose, since it doesn't
> allow _arbitrary_ extensions),
> but I don't think just using streams directly is going to make code much
> longer.
> 
> Or I missed some other camlp4 bits?
> 
> I'm ready to work on a patch if you are open to it.
> 
> On 7/2/19 1:44 PM, Jocelyn Sérot wrote:
>> Le 29 juin 2019 à 17:15, Daniil Baturin <daniil@baturin.org> a écrit :
>> 
>>> Perhaps we should make some coordinated effort to help them.
>>> I've just sent a pull request to the ocamldot maintainer that enables
>>> the graphviz files parsing and printing modules
>>> to build and work with 4.08. The GTK parts have their own issues.
>>> Next I'm going to look into LASCAR/RFSM (packages that interest me first ;).
>>> 
>> Hi Daniil,
>> 
>> I’ve been been thinking of removing the dependency of Lascar and RFSM on camlp4 for a while.
>> Is switching to CamlP5 a good alternative ? 
>> 
>> Jocelyn
>> 
>> 
> 
>