1 (***********************************************************************)
5 (* Kim Nguyen, LRI UMR8623 *)
6 (* Université Paris-Sud & CNRS *)
8 (* Copyright 2010-2012 Université Paris-Sud and Centre National de la *)
9 (* Recherche Scientifique. All rights reserved. This file is *)
10 (* distributed under the terms of the GNU Lesser General Public *)
11 (* License, with the special exception on linking described in file *)
14 (***********************************************************************)
18 type move = [ `Left | `Right | `Epsilon | `Up1 | `Up2 ]
22 | Or of 'formula * 'formula
23 | And of 'formula * 'formula
24 | Move of move * bool * State.t
31 external hash_const_variant : [> ] -> int = "%identity"
32 external vb : bool -> int = "%identity"
34 module rec Node : Hcons.S
35 with type data = Data.t = Hcons.Make (Data)
36 and Data : Hashtbl.HashedType with type t = Node.t node =
39 let equal x y = (*x.size == y.size &&*)
40 match x.pos, y.pos with
41 | a,b when a == b -> true
42 | Or(xf1, xf2), Or(yf1, yf2)
43 | And(xf1, xf2), And(yf1,yf2) -> (xf1 == yf1) && (xf2 == yf2)
44 | Move(d1, p1, s1), Move(d2 ,p2 ,s2) -> d1 == d2 && p1 == p2 && s1 == s2
52 HASHINT3 (PRIME1, Uid.to_int f1.Node.id, Uid.to_int f2.Node.id)
54 HASHINT3(PRIME3, Uid.to_int f1.Node.id, Uid.to_int f2.Node.id)
56 | Move(d, p, s) -> HASHINT4(PRIME5, hash_const_variant d,vb p,s)
60 let hash x = x.Node.hash
62 let equal = Node.equal
63 let expr f = f.Node.node.pos
65 let compare f1 f2 = compare f1.Node.id f2.Node.id
73 let rec print ?(parent=false) ppf f =
74 if parent then fprintf ppf "(";
75 let _ = match expr f with
76 | True -> fprintf ppf "%s" Pretty.top
77 | False -> fprintf ppf "%s" Pretty.bottom
79 print ~parent:(prio f > prio f1) ppf f1;
80 fprintf ppf " %s " Pretty.wedge;
81 print ~parent:(prio f > prio f2) ppf f2;
84 fprintf ppf " %s " Pretty.vee;
87 let _ = flush_str_formatter() in
88 let fmt = str_formatter in
91 | `Left -> Pretty.down_arrow, Pretty.subscript 1
92 | `Right -> Pretty.down_arrow, Pretty.subscript 2
93 | `Epsilon -> Pretty.epsilon, ""
94 | `Up1 -> Pretty.up_arrow, Pretty.subscript 1
95 | `Up2 -> Pretty.up_arrow, Pretty.subscript 2
97 fprintf fmt "%s%s" a_str d_str;
99 let str = flush_str_formatter() in
100 if b then fprintf ppf "%s" str
101 else Pretty.pp_overline ppf str
103 if parent then fprintf ppf ")"
105 let print ppf f = print ~parent:false ppf f
107 let is_true f = (expr f) == True
108 let is_false f = (expr f) == False
112 let nnode = Node.make { pos = neg; neg = (Obj.magic 0); } in
113 let pnode = Node.make { pos = pos; neg = nnode } in
114 (Node.node nnode).neg <- pnode; (* works because the neg field isn't taken into
115 account for hashing ! *)
119 let true_,false_ = cons True False
121 fst (cons (Move(d,p,s)) (Move(d,not p,s)))
123 let not_ f = f.Node.node.neg
126 let order f1 f2 = if uid f1 < uid f2 then f2,f1 else f1,f2
129 (* Tautologies: x|x, x|not(x) *)
131 if equal f1 f2 then f1
132 else if equal f1 (not_ f2) then true_
135 else if is_true f1 || is_true f2 then true_
136 else if is_false f1 && is_false f2 then false_
137 else if is_false f1 then f2
138 else if is_false f2 then f1
140 (* commutativity of | *)
142 let f1, f2 = order f1 f2 in
143 fst (cons (Or(f1,f2)) (And(not_ f1, not_ f2)))
147 not_ (or_ (not_ f1) (not_ f2))
150 let of_bool = function true -> true_ | false -> false_