| 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 typeRule = exp -> bool |
| 29 | val typeRules : typeRule SM.map ref = ref SM.empty |
| 30 | fun registerType (name, rule) = typeRules := SM.insert (!typeRules, name, rule) |
| 31 | fun typeRule name = SM.find (!typeRules, name) |
| 32 | |
| 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, args) = |
| 45 | (print ("Invalid arguments to " ^ name ^ "\n"); |
| 46 | app (fn arg => Print.preface ("Argument: ", Print.p_exp arg)) args; |
| 47 | raise Domain) |
| 48 | fun badArg (func, arg, v) = |
| 49 | (print ("Invalid " ^ arg ^ " argument to " ^ func ^ "\n"); |
| 50 | Print.preface ("Argument: ", Print.p_exp v); |
| 51 | raise Domain) |
| 52 | |
| 53 | type 'a arg = exp -> 'a option |
| 54 | |
| 55 | fun int (EInt n, _) = SOME n |
| 56 | | int _ = NONE |
| 57 | |
| 58 | fun string (EString s, _) = SOME s |
| 59 | | string _ = NONE |
| 60 | |
| 61 | fun mapFail f [] = SOME [] |
| 62 | | mapFail f (h :: t) = |
| 63 | case f h of |
| 64 | NONE => NONE |
| 65 | | SOME h' => |
| 66 | case mapFail f t of |
| 67 | NONE => NONE |
| 68 | | SOME t' => SOME (h' :: t') |
| 69 | |
| 70 | fun list f (EList ls, _) = mapFail f ls |
| 71 | | list _ _ = NONE |
| 72 | |
| 73 | fun one func (name, arg) f (_, [e]) = |
| 74 | (case arg e of |
| 75 | NONE => badArg (func, name, e) |
| 76 | | SOME v => (f v; |
| 77 | SM.empty)) |
| 78 | | one func _ _ (_, es) = badArgs (func, es) |
| 79 | |
| 80 | fun two func (name1, arg1, name2, arg2) f (_, [e1, e2]) = |
| 81 | (case (arg1 e1, arg2 e2) of |
| 82 | (NONE, _) => badArg (func, name1, e1) |
| 83 | | (_, NONE) => badArg (func, name2, e2) |
| 84 | | (SOME v1, SOME v2) => (f (v1, v2); |
| 85 | SM.empty)) |
| 86 | | two func _ _ (_, es) = badArgs (func, es) |
| 87 | |
| 88 | fun type_one func arg f = |
| 89 | registerType (func, fn e => |
| 90 | case arg e of |
| 91 | NONE => false |
| 92 | | SOME v => f v) |
| 93 | |
| 94 | fun action_one name args f = registerAction (name, one name args f) |
| 95 | fun action_two name args f = registerAction (name, two name args f) |
| 96 | |
| 97 | fun container_one name args (f, g) = registerContainer (name, one name args f, g) |
| 98 | |
| 99 | type env = SS.set * (typ * exp option) SM.map |
| 100 | val empty : env = (SS.add (SS.singleton "int", "string"), |
| 101 | SM.empty) |
| 102 | |
| 103 | fun lookupType (ts, _) name = SS.member (ts, name) |
| 104 | fun lookupVal (_, vs) name = |
| 105 | case SM.find (vs, name) of |
| 106 | NONE => NONE |
| 107 | | SOME (t, _) => SOME t |
| 108 | fun lookupEquation (_, vs) name = |
| 109 | case SM.find (vs, name) of |
| 110 | NONE => NONE |
| 111 | | SOME (_, eqo) => eqo |
| 112 | |
| 113 | fun bindType (ts, vs) name = (SS.add (ts, name), vs) |
| 114 | fun bindVal (ts, vs) (name, t, eqo) = (ts, SM.insert (vs, name, (t, eqo))) |
| 115 | |
| 116 | end |