From: Daniel de Rauglaudre <daniel.de_rauglaudre@inria.fr>
To: "Frank A. Christoph" <christo@nextsolution.co.jp>,
CAML List <caml-list@inria.fr>
Subject: Re: Stream parsers, again
Date: Wed, 2 Feb 2000 16:46:32 +0100 [thread overview]
Message-ID: <20000202164632.H15054@jaune.inria.fr> (raw)
In-Reply-To: <000001bf6c5a$be528a00$0150ebca@nextsolution.co.jp>; from Frank A. Christoph on Tue, Feb 01, 2000 at 11:19:18AM +0900
Hello,
On Tue, Feb 01, 2000 at 11:19:18AM +0900, Frank A. Christoph wrote:
> let count = parser bp [< >] -> bp
This function already exists: "Stream.count".
> parser [< e = p; i = count; e' = p' ? err i >] -> ...
>
> BTW, it is nice that the error expression is itself lazily evaluated.
If you got the name of the stream (i.e. "strm"), you can also use:
parser [< e = p; e' = p' ? err (Stream.count strm) >] -> ...
> I think it is too restrictive that it needs to return a string
> rather than an arbitrary type
Mmm... Remember that polymorphic exceptions are impossible in Caml.
Your solution:
> exception Err of int
> let err cnt = raise (Err cnt)
... is the good one.
--
Daniel de RAUGLAUDRE
daniel.de_rauglaudre@inria.fr
http://cristal.inria.fr/~ddr/
prev parent reply other threads:[~2000-02-02 22:04 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-02-01 2:19 Frank A. Christoph
2000-02-02 15:46 ` Daniel de Rauglaudre [this message]
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