From: Martin Jambon <martin.jambon@ens-lyon.org>
To: caml-list@inria.fr
Subject: [camlp4] str_item filters & toplevel?
Date: Thu, 17 Apr 2008 16:17:15 +0200 (CEST) [thread overview]
Message-ID: <Pine.LNX.4.64.0804171603290.9400@martin.ec.wink.com> (raw)
I started from the wiki page describing how to use AST filters:
http://brion.inria.fr/gallium/index.php/Camlp4MapGenerator
The example doesn't work in the toplevel (3.10.1), although it works
otherwise. How to make it work?
Here is my testing session:
$ cat simplify.ml
open Camlp4.PreCast
let simplify = Ast.map_expr begin function
| <:expr< $x$ + zero >> | <:expr< zero + $x$ >> -> x
| x -> x
end
in AstFilters.register_str_item_filter simplify#str_item
let _ =
prerr_string "Loaded \"simplify\"\n";
flush stderr
$ ocamlc -c -pp camlp4of -I +camlp4 simplify.ml
$ \ocaml -I +camlp4 camlp4lib.cma simplify.cmo
Loaded "simplify"
Objective Caml version 3.10.1
# 1 + zero;;
Unbound value zero
#
$ camlp4o ./simplify.cmo -str '1 + zero'
Loaded "simplify"
1
--
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http://mjambon.com
next reply other threads:[~2008-04-17 14:18 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-17 14:17 Martin Jambon [this message]
2008-04-17 14:42 ` [Caml-list] " Nicolas Pouillard
2008-04-17 15:25 ` Martin Jambon
2008-04-17 18:35 ` Nicolas Pouillard
2008-04-17 19:19 ` Martin Jambon
2008-04-18 7:19 ` Nicolas Pouillard
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