[hcoop/domtool2.git] / src / env.sml

(* HCoop Domtool (http://hcoop.sourceforge.net/)
 * Copyright (c) 2006, Adam Chlipala
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *)

(* Domtool type-checking and reduction environments *)

structure Env :> ENV = struct

open Ast

structure SS = StringSet
structure SM = StringMap

type typeRule = exp -> bool
val typeRules : typeRule SM.map ref = ref SM.empty
fun registerType (name, rule) = typeRules := SM.insert (!typeRules, name, rule)
fun typeRule name = SM.find (!typeRules, name)

type env_vars = exp SM.map
type action = env_vars * Ast.exp list -> env_vars
val actions : action SM.map ref = ref SM.empty
fun registerAction (name, action) = actions := SM.insert (!actions, name, action)
fun action name = SM.find (!actions, name)

val containers : (action * (unit -> unit)) SM.map ref = ref SM.empty
fun registerContainer (name, befor, after) =
    containers := SM.insert (!containers, name, (befor, after))
fun container name = SM.find (!containers, name)

val functions : (exp list -> exp option) SM.map ref = ref SM.empty
fun registerFunction (name, f) =
    functions := SM.insert (!functions, name, f)
fun function name = SM.find (!functions, name)

local
    val pr = ref (fn () => ())
in

fun registerPre f =
    let
	val old = !pr
    in
	pr := (fn () => (old (); f ()))
    end
fun pre () = !pr ()

end

local
    val pst = ref (fn () => ())
in

fun registerPost f =
    let
	val old = !pst
    in
	pst := (fn () => (old (); f ()))
    end
fun post () = !pst ()

end

local
    val pr = ref (fn () => ())
in

fun registerPreTycheck f =
    let
	val old = !pr
    in
	pr := (fn () => (old (); f ()))
    end
fun preTycheck () = !pr ()

end

fun badArgs (name, args) =
    (print ("Invalid arguments to " ^ name ^ "\n");
     app (fn arg => Print.preface ("Argument: ", Print.p_exp arg)) args;
     raise Domain)
fun badArg (func, arg, v) =
    (print ("Invalid " ^ arg ^ " argument to " ^ func ^ "\n");
     Print.preface ("Argument: ", Print.p_exp v);
     raise Domain)

type 'a arg = exp -> 'a option

fun int (EInt n, _) = SOME n
  | int _ = NONE

fun string (EString s, _) = SOME s
  | string _ = NONE

fun bool (EVar "false", _) = SOME false
  | bool (EVar "true", _) = SOME true
  | bool _ = NONE

fun mapFail f [] = SOME []
  | mapFail f (h :: t) =
    case f h of
	NONE => NONE
      | SOME h' =>
	case mapFail f t of
	    NONE => NONE
	  | SOME t' => SOME (h' :: t')

fun list f (EList ls, _) = mapFail f ls
  | list _ _ = NONE

fun none func f (_, []) = (f ();
			   SM.empty)
  | none func _ (_, es) = badArgs (func, es)

fun one func (name, arg) f (_, [e]) =
    (case arg e of
	 NONE => badArg (func, name, e)
       | SOME v => (f v;
		    SM.empty))
  | one func _ _ (_, es) = badArgs (func, es)

fun two func (name1, arg1, name2, arg2) f (_, [e1, e2]) =
    (case (arg1 e1, arg2 e2) of
	 (NONE, _) => badArg (func, name1, e1)
       | (_, NONE) => badArg (func, name2, e2)
       | (SOME v1, SOME v2) => (f (v1, v2);
				SM.empty))
  | two func _ _ (_, es) = badArgs (func, es)

fun three func (name1, arg1, name2, arg2, name3, arg3) f (_, [e1, e2, e3]) =
    (case (arg1 e1, arg2 e2, arg3 e3) of
	 (NONE, _, _) => badArg (func, name1, e1)
       | (_, NONE, _) => badArg (func, name2, e2)
       | (_, _, NONE) => badArg (func, name3, e3)
       | (SOME v1, SOME v2, SOME v3) => (f (v1, v2, v3);
					 SM.empty))
  | three func _ _ (_, es) = badArgs (func, es)

fun oneV func (name, arg) f (evs, [e]) =
    (case arg e of
	 NONE => badArg (func, name, e)
       | SOME v => (f (evs, v);
		    SM.empty))
  | oneV func _ _ (_, es) = badArgs (func, es)

fun twoV func (name1, arg1, name2, arg2) f (evs, [e1, e2]) =
    (case (arg1 e1, arg2 e2) of
	 (NONE, _) => badArg (func, name1, e1)
       | (_, NONE) => badArg (func, name2, e2)
       | (SOME v1, SOME v2) => (f (evs, v1, v2);
				SM.empty))
  | twoV func _ _ (_, es) = badArgs (func, es)


fun env arg (evs, name) =
    case SM.find (evs, name) of
	NONE => raise Fail ("Unavailable environment variable " ^ name)
      | SOME e =>
	case arg e of
	    NONE => (Print.preface ("Unexpected value for " ^ name ^ ":",
				    Print.p_exp e);
		     raise Fail ("Bad format for environment variable " ^ name))
	  | SOME v => v

fun type_one func arg f =
    registerType (func, fn e =>
			   case arg e of
			       NONE => false
			     | SOME v => f v)

fun action_none name f = registerAction (name, none name f)
fun action_one name args f = registerAction (name, one name args f)
fun action_two name args f = registerAction (name, two name args f)
fun action_three name args f = registerAction (name, three name args f)

fun actionV_none name f = registerAction (name, fn (env, _) => (f env; env))
fun actionV_one name args f = registerAction (name, oneV name args f)
fun actionV_two name args f = registerAction (name, twoV name args f)

fun container_none name (f, g) = registerContainer (name, none name f, g)
fun container_one name args (f, g) = registerContainer (name, one name args f, g)

fun containerV_one name args (f, g) = registerContainer (name, oneV name args f, g)

type env = SS.set * (typ * exp option) SM.map * SS.set
val empty : env = (SS.empty, SM.empty, SS.empty)

fun lookupType (ts, _, _) name = SS.member (ts, name)
fun lookupVal (_, vs, _) name =
    case SM.find (vs, name) of
	NONE => NONE
      | SOME (t, _) => SOME t
fun lookupEquation (_, vs, _) name =
    case SM.find (vs, name) of
	NONE => NONE
      | SOME (_, eqo) => eqo
fun lookupContext (_, _, cs) name = SS.member (cs, name)

fun bindType (ts, vs, cs) name = (SS.add (ts, name), vs, cs)
fun bindVal (ts, vs, cs) (name, t, eqo) = (ts, SM.insert (vs, name, (t, eqo)), cs)
fun bindContext (ts, vs, cs) name = (ts, vs, SS.add (cs, name))

fun types (ts, _, _) = ts
fun vals (_, vs, _) = SM.foldli (fn (name, _, vs) => SS.add (vs, name)) SS.empty vs
fun contexts (_, _, cs) = cs

end
Commit	Line	Data
492c1cff AC	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.
dac62e84	17	*)
492c1cff AC	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
a3698041 AC	28	type typeRule = exp -> bool
a3698041 AC	29	val typeRules : typeRule SM.map ref = ref SM.empty
6be996d4 AC	30	fun registerType (name, rule) = typeRules := SM.insert (!typeRules, name, rule)
	31	fun typeRule name = SM.find (!typeRules, name)
	32
a3698041 AC	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
cf879b4f AC	44	val functions : (exp list -> exp option) SM.map ref = ref SM.empty
	45	fun registerFunction (name, f) =
	46	functions := SM.insert (!functions, name, f)
	47	fun function name = SM.find (!functions, name)
	48
e0b0abd2 AC	49	local
	50	val pr = ref (fn () => ())
	51	in
	52
	53	fun registerPre f =
	54	let
	55	val old = !pr
	56	in
	57	pr := (fn () => (old (); f ()))
	58	end
	59	fun pre () = !pr ()
	60
	61	end
	62
	63	local
	64	val pst = ref (fn () => ())
	65	in
	66
	67	fun registerPost f =
	68	let
	69	val old = !pst
	70	in
	71	pst := (fn () => (old (); f ()))
	72	end
	73	fun post () = !pst ()
	74
	75	end
	76
12adf55a AC	77	local
	78	val pr = ref (fn () => ())
	79	in
	80
	81	fun registerPreTycheck f =
	82	let
	83	val old = !pr
	84	in
	85	pr := (fn () => (old (); f ()))
	86	end
	87	fun preTycheck () = !pr ()
	88
	89	end
	90
629a34f6 AC	91	fun badArgs (name, args) =
	92	(print ("Invalid arguments to " ^ name ^ "\n");
	93	app (fn arg => Print.preface ("Argument: ", Print.p_exp arg)) args;
	94	raise Domain)
	95	fun badArg (func, arg, v) =
	96	(print ("Invalid " ^ arg ^ " argument to " ^ func ^ "\n");
	97	Print.preface ("Argument: ", Print.p_exp v);
	98	raise Domain)
	99
	100	type 'a arg = exp -> 'a option
	101
	102	fun int (EInt n, _) = SOME n
	103	\| int _ = NONE
	104
	105	fun string (EString s, _) = SOME s
	106	\| string _ = NONE
	107
8a7c40fa AC	108	fun bool (EVar "false", _) = SOME false
	109	\| bool (EVar "true", _) = SOME true
	110	\| bool _ = NONE
	111
629a34f6 AC	112	fun mapFail f [] = SOME []
	113	\| mapFail f (h :: t) =
	114	case f h of
	115	NONE => NONE
	116	\| SOME h' =>
	117	case mapFail f t of
	118	NONE => NONE
	119	\| SOME t' => SOME (h' :: t')
	120
	121	fun list f (EList ls, _) = mapFail f ls
	122	\| list _ _ = NONE
	123
ed9fda3a AC	124	fun none func f (_, []) = (f ();
	125	SM.empty)
	126	\| none func _ (_, es) = badArgs (func, es)
	127
629a34f6 AC	128	fun one func (name, arg) f (_, [e]) =
	129	(case arg e of
	130	NONE => badArg (func, name, e)
	131	\| SOME v => (f v;
	132	SM.empty))
	133	\| one func _ _ (_, es) = badArgs (func, es)
	134
	135	fun two func (name1, arg1, name2, arg2) f (_, [e1, e2]) =
	136	(case (arg1 e1, arg2 e2) of
	137	(NONE, _) => badArg (func, name1, e1)
	138	\| (_, NONE) => badArg (func, name2, e2)
	139	\| (SOME v1, SOME v2) => (f (v1, v2);
	140	SM.empty))
	141	\| two func _ _ (_, es) = badArgs (func, es)
	142
f8dfbbcc AC	143	fun three func (name1, arg1, name2, arg2, name3, arg3) f (_, [e1, e2, e3]) =
	144	(case (arg1 e1, arg2 e2, arg3 e3) of
	145	(NONE, _, _) => badArg (func, name1, e1)
	146	\| (_, NONE, _) => badArg (func, name2, e2)
	147	\| (_, _, NONE) => badArg (func, name3, e3)
	148	\| (SOME v1, SOME v2, SOME v3) => (f (v1, v2, v3);
	149	SM.empty))
	150	\| three func _ _ (_, es) = badArgs (func, es)
6ae327f8 AC	151
	152	fun oneV func (name, arg) f (evs, [e]) =
	153	(case arg e of
	154	NONE => badArg (func, name, e)
	155	\| SOME v => (f (evs, v);
	156	SM.empty))
	157	\| oneV func _ _ (_, es) = badArgs (func, es)
	158
e0b0abd2 AC	159	fun twoV func (name1, arg1, name2, arg2) f (evs, [e1, e2]) =
	160	(case (arg1 e1, arg2 e2) of
	161	(NONE, _) => badArg (func, name1, e1)
	162	\| (_, NONE) => badArg (func, name2, e2)
	163	\| (SOME v1, SOME v2) => (f (evs, v1, v2);
	164	SM.empty))
	165	\| twoV func _ _ (_, es) = badArgs (func, es)
	166
6ae327f8 AC	167
	168	fun env arg (evs, name) =
	169	case SM.find (evs, name) of
	170	NONE => raise Fail ("Unavailable environment variable " ^ name)
	171	\| SOME e =>
	172	case arg e of
47163553 AC	173	NONE => (Print.preface ("Unexpected value for " ^ name ^ ":",
	174	Print.p_exp e);
	175	raise Fail ("Bad format for environment variable " ^ name))
6ae327f8 AC	176	\| SOME v => v
6ae327f8 AC	177
629a34f6 AC	178	fun type_one func arg f =
	179	registerType (func, fn e =>
	180	case arg e of
	181	NONE => false
	182	\| SOME v => f v)
	183
ed9fda3a	184	fun action_none name f = registerAction (name, none name f)
629a34f6 AC	185	fun action_one name args f = registerAction (name, one name args f)
629a34f6 AC	186	fun action_two name args f = registerAction (name, two name args f)
f8dfbbcc	187	fun action_three name args f = registerAction (name, three name args f)
629a34f6	188
e0b0abd2	189	fun actionV_none name f = registerAction (name, fn (env, _) => (f env; env))
6ae327f8	190	fun actionV_one name args f = registerAction (name, oneV name args f)
e0b0abd2	191	fun actionV_two name args f = registerAction (name, twoV name args f)
6ae327f8 AC	192
6ae327f8 AC	193	fun container_none name (f, g) = registerContainer (name, none name f, g)
629a34f6	194	fun container_one name args (f, g) = registerContainer (name, one name args f, g)
a3698041	195
6ae327f8 AC	196	fun containerV_one name args (f, g) = registerContainer (name, oneV name args f, g)
6ae327f8 AC	197
095de39e AC	198	type env = SS.set * (typ * exp option) SM.map * SS.set
095de39e AC	199	val empty : env = (SS.empty, SM.empty, SS.empty)
492c1cff	200
095de39e AC	201	fun lookupType (ts, _, _) name = SS.member (ts, name)
095de39e AC	202	fun lookupVal (_, vs, _) name =
492c1cff AC	203	case SM.find (vs, name) of
	204	NONE => NONE
	205	\| SOME (t, _) => SOME t
095de39e	206	fun lookupEquation (_, vs, _) name =
492c1cff AC	207	case SM.find (vs, name) of
	208	NONE => NONE
	209	\| SOME (_, eqo) => eqo
095de39e	210	fun lookupContext (_, _, cs) name = SS.member (cs, name)
492c1cff	211
095de39e AC	212	fun bindType (ts, vs, cs) name = (SS.add (ts, name), vs, cs)
	213	fun bindVal (ts, vs, cs) (name, t, eqo) = (ts, SM.insert (vs, name, (t, eqo)), cs)
	214	fun bindContext (ts, vs, cs) name = (ts, vs, SS.add (cs, name))
	215
	216	fun types (ts, _, _) = ts
	217	fun vals (_, vs, _) = SM.foldli (fn (name, _, vs) => SS.add (vs, name)) SS.empty vs
	218	fun contexts (_, _, cs) = cs
492c1cff AC	219
492c1cff AC	220	end