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)
32 external hash_const_variant : [> ] -> int = "%identity"
33 external vb : bool -> int = "%identity"
35 module rec Node : Hcons.S
36 with type data = Data.t = Hcons.Make (Data)
37 and Data : Hashtbl.HashedType with type t = Node.t node =
40 let equal x y = (*x.size == y.size &&*)
41 match x.pos, y.pos with
42 | a,b when a == b -> true
43 | Or(xf1, xf2), Or(yf1, yf2)
44 | And(xf1, xf2), And(yf1,yf2) -> (xf1 == yf1) && (xf2 == yf2)
45 | Move(d1, p1, s1), Move(d2 ,p2 ,s2) -> d1 == d2 && p1 == p2 && s1 == s2
46 | Label s1, Label s2 -> s1 == s2
54 HASHINT3 (PRIME1, Uid.to_int f1.Node.id, Uid.to_int f2.Node.id)
56 HASHINT3(PRIME3, Uid.to_int f1.Node.id, Uid.to_int f2.Node.id)
58 | Move(d, p, s) -> HASHINT4(PRIME5, hash_const_variant d,vb p,s)
59 | Label s -> HASHINT2(PRIME7, Uid.to_int s.QNameSet.id)
63 let hash x = x.Node.key
65 let equal = Node.equal
66 let expr f = f.Node.node.pos
67 (*let st f = f.Node.node.st*)
68 (*let size f = f.Node.node.size*)
69 let compare f1 f2 = compare f1.Node.id f2.Node.id
78 let rec print ?(parent=false) ppf f =
79 if parent then fprintf ppf "(";
80 let _ = match expr f with
81 | True -> fprintf ppf "%s" Pretty.top
82 | False -> fprintf ppf "%s" Pretty.bottom
84 print ~parent:(prio f > prio f1) ppf f1;
85 fprintf ppf " %s " Pretty.wedge;
86 print ~parent:(prio f > prio f2) ppf f2;
89 fprintf ppf " %s " Pretty.vee;
91 | Label s -> fprintf ppf "%a" QNameSet.print s
93 let _ = flush_str_formatter() in
94 let fmt = str_formatter in
97 | `Left -> Pretty.down_arrow, Pretty.subscript 1
98 | `Right -> Pretty.down_arrow, Pretty.subscript 2
100 fprintf fmt "%s%s" a_str d_str;
102 let str = flush_str_formatter() in
103 if b then fprintf ppf "%s" str
104 else Pretty.pp_overline ppf str
106 if parent then fprintf ppf ")"
108 let print ppf f = print ~parent:false ppf f
110 let is_true f = (expr f) == True
111 let is_false f = (expr f) == False
114 let cons pos neg s1 s2 size1 size2 =
115 let nnode = Node.make { pos = neg; neg = (Obj.magic 0); st = s2; size = size2 } in
116 let pnode = Node.make { pos = pos; neg = nnode ; st = s1; size = size1 } in
117 (Node.node nnode).neg <- pnode; (* works because the neg field isn't taken into
118 account for hashing ! *)
122 let empty_pair = StateSet.empty, StateSet.empty
123 let true_,false_ = cons True False empty_pair empty_pair 0 0
125 let si = StateSet.singleton s in
126 let ss = match d with
127 | `Left -> si, StateSet.empty
128 | `Right -> StateSet.empty, si
129 in fst (cons (Atom(d,p,s)) (Atom(d,not p,s)) ss ss 1 1)
131 let not_ f = f.Node.node.neg
133 let union_pair (l1,r1) (l2, r2) =
134 StateSet.union l1 l2,
137 let merge_states f1 f2 =
139 union_pair (st f1) (st f2)
141 union_pair (st (not_ f1)) (st (not_ f2))
145 let order f1 f2 = if uid f1 < uid f2 then f2,f1 else f1,f2
148 (* Tautologies: x|x, x|not(x) *)
150 if equal f1 f2 then f1
151 else if equal f1 (not_ f2) then true_
154 else if is_true f1 || is_true f2 then true_
155 else if is_false f1 && is_false f2 then false_
156 else if is_false f1 then f2
157 else if is_false f2 then f1
159 (* commutativity of | *)
161 let f1, f2 = order f1 f2 in
162 let psize = (size f1) + (size f2) in
163 let nsize = (size (not_ f1)) + (size (not_ f2)) in
164 let sp, sn = merge_states f1 f2 in
165 fst (cons (Or(f1,f2)) (And(not_ f1, not_ f2)) sp sn psize nsize)
169 not_ (or_ (not_ f1) (not_ f2))
172 let of_bool = function true -> true_ | false -> false_
175 module Infix = struct
176 let ( +| ) f1 f2 = or_ f1 f2
178 let ( *& ) f1 f2 = and_ f1 f2
180 let ( *+ ) d s = atom_ d true s
181 let ( *- ) d s = atom_ d false s