Compile-time configuration infrastructure
[hcoop/domtool2.git] / src / domain.sml
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a3698041
AC
1(* HCoop Domtool (http://hcoop.sourceforge.net/)
2 * Copyright (c) 2006, Adam Chlipala
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17*)
18
19(* Domain-related primitive actions *)
20
21structure Domain :> DOMAIN = struct
22
23open Ast
24
25val befores = ref (fn (_ : string) => ())
26val afters = ref (fn (_ : string) => ())
27
28fun registerBefore f =
29 let
30 val old = !befores
31 in
32 befores := (fn x => (old x; f x))
33 end
34
35fun registerAfter f =
36 let
37 val old = !afters
38 in
39 afters := (fn x => (old x; f x))
40 end
41
42val current = ref ""
43
44val _ = Env.registerContainer ("domain",
45 fn (_, [(EString dom, _)]) => (current := dom;
46 !befores dom;
47 StringMap.empty)
48 | _ => Env.badArgs "domain",
49 fn () => !afters (!current))
50
51end