7 | Or of 'hcons * 'hcons
8 | And of 'hcons * 'hcons
9 | Atom of ([ `Left | `Right | `Epsilon ] * bool * State.t)
10 | Pred of Tree.Predicate.t
15 st : StateSet.t * StateSet.t;
16 size: int; (* Todo check if this is needed *)
19 external hash_const_variant : [> ] -> int = "%identity"
21 module rec Node : Hcons.S
22 with type data = Data.t = Hcons.Make (Data)
23 and Data : Hashtbl.HashedType with type t = Node.t node =
26 let equal x y = x.size == y.size &&
27 match x.pos, y.pos with
28 | a,b when a == b -> true
29 | Or(xf1, xf2), Or(yf1, yf2)
30 | And(xf1, xf2), And(yf1,yf2) -> (xf1 == yf1) && (xf2 == yf2)
31 | Atom(d1, p1, s1), Atom(d2 ,p2 ,s2) -> d1 == d2 && p1 == p2 && s1 == s2
32 | Pred(p1), Pred(p2) -> p1 == p2
39 | Or (f1, f2) -> HASHINT3(PRIME2, Uid.to_int f1.Node.id, Uid.to_int f2.Node.id)
40 | And (f1, f2) -> HASHINT3(PRIME3, Uid.to_int f1.Node.id, Uid.to_int f2.Node.id)
41 | Atom(d, p, s) -> HASHINT4(PRIME4, hash_const_variant d,vb p,s)
42 | Pred(p) -> HASHINT2(PRIME5, Uid.to_int p.Tree.Predicate.id)
46 let hash x = x.Node.key
48 let equal = Node.equal
49 let expr f = f.Node.node.pos
50 let st f = f.Node.node.st
51 let size f = f.Node.node.size
52 let compare f1 f2 = compare f1.Node.id f2.Node.id
61 let rec print ?(parent=false) ppf f =
62 if parent then fprintf ppf "(";
63 let _ = match expr f with
64 | True -> fprintf ppf "%s" Pretty.top
65 | False -> fprintf ppf "%s" Pretty.bottom
67 print ~parent:(prio f > prio f1) ppf f1;
68 fprintf ppf " %s " Pretty.wedge;
69 print ~parent:(prio f > prio f2) ppf f2;
72 fprintf ppf " %s " Pretty.vee;
75 let _ = flush_str_formatter() in
76 let fmt = str_formatter in
79 | `Left -> Pretty.down_arrow, Pretty.subscript 1
80 | `Right -> Pretty.down_arrow, Pretty.subscript 2
81 | `Epsilon -> Pretty.epsilon, ""
83 fprintf fmt "%s%s" a_str d_str;
85 let str = flush_str_formatter() in
86 if b then fprintf ppf "%s" str
87 else Pretty.pp_overline ppf str
88 | Pred p -> fprintf ppf "P%s" (Pretty.subscript (Uid.to_int p.Tree.Predicate.id))
90 if parent then fprintf ppf ")"
92 let print ppf f = print ~parent:false ppf f
94 let is_true f = (expr f) == True
95 let is_false f = (expr f) == False
98 let cons pos neg s1 s2 size1 size2 =
99 let nnode = Node.make { pos = neg; neg = (Obj.magic 0); st = s2; size = size2 } in
100 let pnode = Node.make { pos = pos; neg = nnode ; st = s1; size = size1 } in
101 (Node.node nnode).neg <- pnode; (* works because the neg field isn't taken into
102 account for hashing ! *)
106 let empty_pair = StateSet.empty, StateSet.empty
107 let true_,false_ = cons True False empty_pair empty_pair 0 0
109 let si = StateSet.singleton s in
110 let ss = match d with
111 | `Left -> si, StateSet.empty
112 | `Right -> StateSet.empty, si
113 | `Epsilon -> empty_pair (* TODO CHECK *)
114 in fst (cons (Atom(d,p,s)) (Atom(d,not p,s)) ss ss 1 1)
117 let fneg = !(p.Tree.Predicate.node) in
118 let pneg = Tree.Predicate.make (ref (fun t n -> not (fneg t n))) in
119 fst (cons (Pred p) (Pred pneg) empty_pair empty_pair 1 1)
121 let not_ f = f.Node.node.neg
123 let union_pair (l1,r1) (l2, r2) =
124 StateSet.mem_union l1 l2,
125 StateSet.mem_union r1 r2
127 let merge_states f1 f2 =
129 union_pair (st f1) (st f2)
131 union_pair (st (not_ f1)) (st (not_ f2))
135 let order f1 f2 = if uid f1 < uid f2 then f2,f1 else f1,f2
138 (* Tautologies: x|x, x|not(x) *)
140 if equal f1 f2 then f1
141 else if equal f1 (not_ f2) then true_
144 else if is_true f1 || is_true f2 then true_
145 else if is_false f1 && is_false f2 then false_
146 else if is_false f1 then f2
147 else if is_false f2 then f1
149 (* commutativity of | *)
151 let f1, f2 = order f1 f2 in
152 let psize = (size f1) + (size f2) in
153 let nsize = (size (not_ f1)) + (size (not_ f2)) in
154 let sp, sn = merge_states f1 f2 in
155 fst (cons (Or(f1,f2)) (And(not_ f1, not_ f2)) sp sn psize nsize)
159 not_ (or_ (not_ f1) (not_ f2))
162 let of_bool = function true -> true_ | false -> false_
165 match expr f1, expr f2 with
166 | Pred p1, Pred p2 ->
167 let fp1 = !(p1.Tree.Predicate.node)
168 and fp2 = !(p2.Tree.Predicate.node) in
169 pred_ (Tree.Predicate.make (ref (fun t n -> (fp1 t n) || (fp2 t n))))
173 match expr f1, expr f2 with
175 let fp1 = !(p1.Tree.Predicate.node)
176 and fp2 = !(p2.Tree.Predicate.node) in
177 pred_ (Tree.Predicate.make (ref (fun t n -> (fp1 t n) && (fp2 t n))))
181 module Infix = struct
182 let ( +| ) f1 f2 = or_ f1 f2
184 let ( *& ) f1 f2 = and_ f1 f2
186 let ( *+ ) d s = atom_ d true s
187 let ( *- ) d s = atom_ d false s