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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 | (* Domtool type-checking and reduction environments *) |
20 | |
21 | structure Env :> ENV = struct |
22 | |
23 | open Ast |
24 | |
25 | structure SS = StringSet |
26 | structure SM = StringMap |
27 | |
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28 | val typeRules : (exp -> bool) SM.map ref = ref SM.empty |
29 | fun registerType (name, rule) = typeRules := SM.insert (!typeRules, name, rule) |
30 | fun typeRule name = SM.find (!typeRules, name) |
31 | |
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32 | type env = SS.set * (typ * exp option) SM.map |
33 | val empty : env = (SS.add (SS.singleton "int", "string"), |
34 | SM.empty) |
35 | |
36 | fun lookupType (ts, _) name = SS.member (ts, name) |
37 | fun lookupVal (_, vs) name = |
38 | case SM.find (vs, name) of |
39 | NONE => NONE |
40 | | SOME (t, _) => SOME t |
41 | fun lookupEquation (_, vs) name = |
42 | case SM.find (vs, name) of |
43 | NONE => NONE |
44 | | SOME (_, eqo) => eqo |
45 | |
46 | fun bindType (ts, vs) name = (SS.add (ts, name), vs) |
47 | fun bindVal (ts, vs) (name, t, eqo) = (ts, SM.insert (vs, name, (t, eqo))) |
48 | |
49 | end |