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7f918cf1 CE |
1 | (* Copyright (C) 1999-2005 Henry Cejtin, Matthew Fluet, Suresh |
2 | * Jagannathan, and Stephen Weeks. | |
3 | * | |
4 | * MLton is released under a BSD-style license. | |
5 | * See the file MLton-LICENSE for details. | |
6 | *) | |
7 | ||
8 | functor Control(): CONTROL = | |
9 | struct | |
10 | ||
11 | val defaults: (unit -> unit) list ref = ref [] | |
12 | ||
13 | val settings: {name: string, | |
14 | value: (unit -> string)} list ref = ref [] | |
15 | ||
16 | fun setDefaults() = List.foreach(!defaults, fn f => f()) | |
17 | ||
18 | fun control{name, default, toString} = | |
19 | let val r = ref default | |
20 | in List.push(settings, {name = name, | |
21 | value = fn () => toString(!r)}) | |
22 | ; List.push(defaults, fn () => r := default) | |
23 | ; r | |
24 | end | |
25 | ||
26 | fun all() = | |
27 | List.fold(!settings, [], fn ({name, value}, ac) => | |
28 | {name = name, value = value()} :: ac) | |
29 | ||
30 | end |