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From: Pierre Weis <pierre.weis@inria.fr>
Message-Id: <200309291700.TAA27229@pauillac.inria.fr>
Subject: Re: [Caml-list] Printing text with holes
In-Reply-To: <Pine.LNX.4.40.0309291422530.2504-100000@pc-bioinfo1> from Martin Jambon at "Sep 29, 103 03:16:38 pm"
To: martin_jambon@emailuser.net (Martin Jambon)
Date: Mon, 29 Sep 2003 19:00:16 +0200 (MET DST)
Cc: caml-list@inria.fr
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Hello,

> I am curious to know what people use to print long text written in a
> natural language, and containing many holes, like dynamically generated
> web pages.
[...]
> Does anyone need this kind of approach?
> Any better ideas?
> 
> I put my implementation here (it is quite ugly, I still ignore everything
> about Camlp4):
>   http://martin.jambon.free.fr/bazar/printfer.tar.gz

Many people use the same approach with dollars. In the 3.07 release of
Objective Caml there is some support to easily obtain such a feature:
in the interface of the module Buffer, we find

val add_substitute : t -> (string -> string) -> string -> unit
(** [add_substitute b f s] appends the string pattern [s] at the end
   of the buffer [b] with substitution.
   The substitution process looks for variables into
   the pattern and substitutes each variable name by its value, as
   obtained by applying the mapping [f] to the variable name. Inside the
   string pattern, a variable name immediately follows a non-escaped
   [$] character and is one of the following:
   - a non empty sequence of alphanumeric or [_] characters,
   - an arbitrary sequence of characters enclosed by a pair of
   matching parentheses or curly brackets.
   An escaped [$] character is a [$] that immediately follows a backslash
   character; it then stands for a plain [$].
   Raise [Not_found] if the closing character of a parenthesized variable
   cannot be found. *)

This may be used to create strings with $identifiers to expand in them.

Hope this helps,

Pierre Weis

INRIA, Projet Cristal, Pierre.Weis@inria.fr, http://pauillac.inria.fr/~weis/


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