[Caml-list] pretty-printing with camlp4

[Caml-list] pretty-printing with camlp4

[Markus Mottl]

Hello,

I would like to adapt pretty-printing of OCaml-sources with camlp4 to
match my style.  What would be the best way to go about this? Just copy
e.g. camlp4/etc/pr_o.ml and change it to my needs? Or are there more
convenient ways to parameterize the existing pretty-printers (quite
complex stuff)?

People might find a transition between syntaxes easier if they can
parameterize pretty-printers for automatic conversion so that they end
up with sources that match their style very closely.

I have played around a bit with pretty-printing some of my existing
sources and would say that translating them to e.g. revised syntax would
be almost zero effort if I could easily tweak the pretty-printers a
bit here and there. In fact, I have already seen more badly formatted
OCaml-code written by humans, which indicates that feeding external
sources through the pretty-printers might always be a good idea... ;)

Regards,
Markus Mottl

-- 
Markus Mottl                                             markus@oefai.at
Austrian Research Institute
for Artificial Intelligence                  http://www.oefai.at/~markus
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Re: [Caml-list] pretty-printing with camlp4

[Daniel de Rauglaudre]

Hi,

On Tue, Feb 05, 2002 at 01:17:05PM +0100, Markus Mottl wrote:

> I would like to adapt pretty-printing of OCaml-sources with camlp4 to
> match my style.  What would be the best way to go about this? Just copy
> e.g. camlp4/etc/pr_o.ml and change it to my needs?

You can do that indeed, but my pretty printer is badly written, it is
probably difficult to understand. I should rewrite it using Format one
day, but it is a big work.

-- 
Daniel de RAUGLAUDRE
daniel.de_rauglaudre@inria.fr
http://cristal.inria.fr/~ddr/
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Re: [Caml-list] pretty-printing with camlp4

[Remi VANICAT]

Daniel de Rauglaudre <daniel.de_rauglaudre@inria.fr> writes:

> Hi,
> 
> On Tue, Feb 05, 2002 at 01:17:05PM +0100, Markus Mottl wrote:
> 
> > I would like to adapt pretty-printing of OCaml-sources with camlp4 to
> > match my style.  What would be the best way to go about this? Just copy
> > e.g. camlp4/etc/pr_o.ml and change it to my needs?
> 
> You can do that indeed, but my pretty printer is badly written, it is
> probably difficult to understand. I should rewrite it using Format one
> day, but it is a big work.

by the way, if you have the file spretty_option.ml :

-- begin of file --
value set_dt x =
  Spretty.dt.val := x
;

value set_tol x =
  Spretty.tol.val := x
;

value set_sp st =
  Spretty.sp.val := Token.eval_char st
;

Pcaml.add_option "-dt" (Arg.Int set_dt) "change dt value";
Pcaml.add_option "-tol" (Arg.Int set_tol) "change tol value";
Pcaml.add_option "-sp" (Arg.String set_sp) "change sp value";
-- end of file --

(compile with :
 ocamlc -I +camlp4 -pp camlp4r -c spretty_option.ml 
)

then camlp4 will have 3 new option : -dt -tol and -sp that will
change some pretty printer action :
- tol seem to change the way you indent in a long application
- dt is the default indentation
- sp is the space char  (not sure it may be useful to change it)

(just try).

-- 
Rémi Vanicat
vanicat@labri.u-bordeaux.fr
http://dept-info.labri.u-bordeaux.fr/~vanicat
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Re: [Caml-list] pretty-printing with camlp4

[Markus Mottl]

On Tue, 05 Feb 2002, Daniel de Rauglaudre wrote:
> On Tue, Feb 05, 2002 at 01:17:05PM +0100, Markus Mottl wrote:
> > I would like to adapt pretty-printing of OCaml-sources with camlp4 to
> > match my style.  What would be the best way to go about this? Just copy
> > e.g. camlp4/etc/pr_o.ml and change it to my needs?
> 
> You can do that indeed, but my pretty printer is badly written, it is
> probably difficult to understand. I should rewrite it using Format one
> day, but it is a big work.

Indeed, it's quite complex. It would be really nice to see it use the
Format-module...

Regards,
Markus Mottl

-- 
Markus Mottl                                             markus@oefai.at
Austrian Research Institute
for Artificial Intelligence                  http://www.oefai.at/~markus
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