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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 | type typeRule = exp -> bool |
29 | val typeRules : typeRule SM.map ref = ref SM.empty | |
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30 | fun registerType (name, rule) = typeRules := SM.insert (!typeRules, name, rule) |
31 | fun typeRule name = SM.find (!typeRules, name) | |
32 | ||
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33 | type env_vars = exp SM.map |
34 | type action = env_vars * Ast.exp list -> env_vars | |
35 | val actions : action SM.map ref = ref SM.empty | |
36 | fun registerAction (name, action) = actions := SM.insert (!actions, name, action) | |
37 | fun action name = SM.find (!actions, name) | |
38 | ||
39 | val containers : (action * (unit -> unit)) SM.map ref = ref SM.empty | |
40 | fun registerContainer (name, befor, after) = | |
41 | containers := SM.insert (!containers, name, (befor, after)) | |
42 | fun container name = SM.find (!containers, name) | |
43 | ||
44 | fun badArgs name = raise Fail ("Invalid arguments to " ^ name) | |
45 | ||
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46 | type env = SS.set * (typ * exp option) SM.map |
47 | val empty : env = (SS.add (SS.singleton "int", "string"), | |
48 | SM.empty) | |
49 | ||
50 | fun lookupType (ts, _) name = SS.member (ts, name) | |
51 | fun lookupVal (_, vs) name = | |
52 | case SM.find (vs, name) of | |
53 | NONE => NONE | |
54 | | SOME (t, _) => SOME t | |
55 | fun lookupEquation (_, vs) name = | |
56 | case SM.find (vs, name) of | |
57 | NONE => NONE | |
58 | | SOME (_, eqo) => eqo | |
59 | ||
60 | fun bindType (ts, vs) name = (SS.add (ts, name), vs) | |
61 | fun bindVal (ts, vs) (name, t, eqo) = (ts, SM.insert (vs, name, (t, eqo))) | |
62 | ||
63 | end |