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Date: Sat, 2 Mar 2002 12:35:49 +0100
From: Daniel de Rauglaudre <daniel.de_rauglaudre@inria.fr>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Documenting CamlP4 syntax extensions
Message-ID: <20020302123549.H23423@verdot.inria.fr>
References: <3C80A289.D5B49C88@tepkom.ru>
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In-Reply-To: <3C80A289.D5B49C88@tepkom.ru>; from dsl@tepkom.ru on Sat, Mar 02, 2002 at 01:59:37PM +0400
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Hi,

On Sat, Mar 02, 2002 at 01:59:37PM +0400, Mitya Lomov wrote:

> The first step to that will be, I guess, some kind of
> tool that is able to extract plain grammar definitions
> (like BNF) from CamlP4 sources (just rules, without
> semantics).

The function Grammar.Entry.print prints the rules of a grammar
entry. For example, the code:
    Grammar.Entry.print Pcaml.expr
prints the rules for expressions.

You can try it in the toplevel (load "camlp4o.cma" for normal syntax
or "camlp4r.cma" for revised syntax, before) or write a little program
displaying the main entry rules (defined in module Pcaml).

For example, to display expressions and patterns, file "foo.ml":
    Format.printf "@[<v 2>expr@ ";
    Grammar.Entry.print Pcaml.expr;
    Format.printf "@]@.";
    Format.printf "@[<v 2>patt@ ";
    Grammar.Entry.print Pcaml.patt;
    Format.printf "@]@.";

Compilation:
    ocamlc -pp camlp4r -I +camlp4 -c foo.ml

Print expressions and patterns rules of normal syntax:
    camlp4o ./foo.cmo

And of revised syntax:
    camlp4r ./foo.cmo

Perhaps a complete program displaying all entries (by scanning the
main grammar entries "interf" and "implem") could be useful. It is
possible to scan entries using the (undocumented) module Gramext.
I can do that, if you want it.

-- 
Daniel de RAUGLAUDRE
daniel.de_rauglaudre@inria.fr
http://cristal.inria.fr/~ddr/
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