1 (* HCoop
Domtool (http
://hcoop
.sourceforge
.net
/)
2 * Copyright (c
) 2006, Adam Chlipala
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
.
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
.
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
.
19 (* Domtool
type-checking
and reduction environments
*)
21 structure Env
:> ENV
= struct
25 structure SS
= StringSet
26 structure SM
= StringMap
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
)
32 type env
= SS
.set
* (typ
* exp option
) SM
.map
33 val empty
: env
= (SS
.add (SS
.singleton
"int", "string"),
36 fun lookupType (ts
, _
) name
= SS
.member (ts
, name
)
37 fun lookupVal (_
, vs
) name
=
38 case SM
.find (vs
, name
) of
40 |
SOME (t
, _
) => SOME t
41 fun lookupEquation (_
, vs
) name
=
42 case SM
.find (vs
, name
) of
44 |
SOME (_
, eqo
) => eqo
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
)))