| 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 | 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 | |
| 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 |