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From: Julie Farago <farago@eecs.harvard.edu>
To: caml-list@inria.fr
Subject: [Caml-list] camlp4 and anonymous function naming
Date: Tue, 2 Jul 2002 16:48:22 -0400 (EDT)	[thread overview]
Message-ID: <Pine.BSF.4.44.0207021635090.78988-100000@bowser.eecs.harvard.edu> (raw)
In-Reply-To: <20020702.115619.74735853.avv@quasar.ipa.nw.ru>

camlp4 hackers,

I am trying to use camlp4 to name anonymous functions. I want to take code
that in the form:
fun <args> -> <body>

and convert it to:
let anonfunc<number> <args> = <body> in anonfunc<number>

I've read over the camlp4 tutorial and have some sense of how to do this,
but am getting stuck because I do not know the correct syntax to use. I
currently am extending the grammar with:

EXTEND
 expr:
   [[ "fun" ; vars = LIST1 LIDENT ; "->" ; e = expr ->
         givenames loc vars e ]]
 ;
END;;

and then I try and re-write the anonymous function with:

let namefun =
  let cnt = ref 0 in
    fun var -> let x = incr cnt ; !cnt in
    var ^ "_genfun" ^ string_of_int x

let givenames loc vars e =
  let name = namefun "my" in
    <:expr<
      let $lid:name$ $vars$ = $e$
      in $lid:name$ >>

This code is, of course, wrong. The problem is that I cannot figure out
how to simply capture the args from the fun and place them back into the
let.

Any direction you could provide on this would be great!
-Julie

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  reply	other threads:[~2002-07-02 20:48 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-07-02 18:56 [Caml-list] embedding OCaml into C on win32 Alexander V.Voinov
2002-07-02 20:48 ` Julie Farago [this message]
2002-07-03  8:08   ` [Caml-list] camlp4 and anonymous function naming Daniel de Rauglaudre
2002-07-02 21:30 ` [Caml-list] embedding OCaml into C on win32 Alexander V.Voinov
2002-07-02 22:32   ` Alexander V.Voinov

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