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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 | ||
28 | type env = SS.set * (typ * exp option) SM.map | |
29 | val empty : env = (SS.add (SS.singleton "int", "string"), | |
30 | SM.empty) | |
31 | ||
32 | fun lookupType (ts, _) name = SS.member (ts, name) | |
33 | fun lookupVal (_, vs) name = | |
34 | case SM.find (vs, name) of | |
35 | NONE => NONE | |
36 | | SOME (t, _) => SOME t | |
37 | fun lookupEquation (_, vs) name = | |
38 | case SM.find (vs, name) of | |
39 | NONE => NONE | |
40 | | SOME (_, eqo) => eqo | |
41 | ||
42 | fun bindType (ts, vs) name = (SS.add (ts, name), vs) | |
43 | fun bindVal (ts, vs) (name, t, eqo) = (ts, SM.insert (vs, name, (t, eqo))) | |
44 | ||
45 | end |