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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 |