| 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 | (* Default record field database *) |
| 20 | |
| 21 | structure Defaults :> DEFAULTS = struct |
| 22 | |
| 23 | open Ast Print |
| 24 | |
| 25 | structure SM = StringMap |
| 26 | |
| 27 | val dmy = ErrorMsg.dummyLoc |
| 28 | |
| 29 | val defaultT : record ref = ref SM.empty |
| 30 | val defaultV : (unit -> exp) SM.map ref = ref SM.empty |
| 31 | |
| 32 | fun registerDefault (name, t, v) = |
| 33 | case SM.find (!defaultT, name) of |
| 34 | NONE => (defaultT := SM.insert (!defaultT, name, t); |
| 35 | defaultV := SM.insert (!defaultV, name, v)) |
| 36 | | SOME _ => raise Fail "Duplicate default environment variable" |
| 37 | |
| 38 | fun allSets (e, _) = |
| 39 | case e of |
| 40 | ESkip => true |
| 41 | | ESet _ => true |
| 42 | | ESeq es => List.all allSets es |
| 43 | | _ => false |
| 44 | |
| 45 | val dmy = ErrorMsg.dummyLoc |
| 46 | |
| 47 | fun bodyType (_, _, SOME e) = |
| 48 | if allSets e then |
| 49 | (CPrefix (CRoot, dmy), dmy) |
| 50 | else |
| 51 | (CRoot, dmy) |
| 52 | | bodyType _ = (CRoot, dmy) |
| 53 | |
| 54 | fun tInit p = |
| 55 | (TAction (bodyType p, |
| 56 | !defaultT, |
| 57 | StringMap.empty), |
| 58 | dmy) |
| 59 | |
| 60 | fun eInit () = SM.map (fn f => f ()) (!defaultV) |
| 61 | |
| 62 | |
| 63 | end |