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Camlp4: example/parse_files.ml
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Date: -- (:)
From: Hendrik Tews <tews@c...>
Subject: Camlp4: example/parse_files.ml
Hi,

I have a few questions to the parse_files example.

The example starts with building the parser and printer via the
following functor application

    module Caml =
      Camlp4.Printers.OCaml.Make
	(Camlp4OCamlParser.Make
	  (Camlp4OCamlRevisedParser.Make
	    (Camlp4.OCamlInitSyntax.Make(Ast)(Gram)(Quotation))));;


1. Can I omit the printer functor if I am only interested in
   parsing files (and not printing) and simplify to

    module Caml =
       Camlp4OCamlParser.Make
	(Camlp4OCamlRevisedParser.Make
	  (Camlp4.OCamlInitSyntax.Make(Ast)(Gram)(Quotation)))

2. Ast, Gram, Quotation come from Camlp4.PreCast. Do I miss
   something if I simplify further to

    module Caml =
       Camlp4OCamlParser.Make
	(Camlp4OCamlRevisedParser.Make(Camlp4.PreCast.Syntax))

3. I looked into the registration of syntax extentions (Register
   functors) and how the syntax extention callbacks are called
   in Register.iter_and_take_callbacks. I have the impression
   that in camlp4 not the above nested functor application is
   performed but the Make functors are sequentially applied to
   the same Syntax functor. Therefore, can I further simplify to 

    module Caml = Camlp4.PreCast.Syntax
    let () = 
      let module M1 = Camlp4OCamlRevisedParser.Make(Caml) in
      let module M2 = Camlp4OCamlParser.Make(Caml)
      in
	()

   ?

Bye,

Hendrik