+
+let get_trans a tag states =
+ let trs =
+ Cache.N2.find a.cache2
+ (tag.QName.id :> int) (states.StateSet.id :> int)
+ in
+ if trs == dummy2 then
+ let trs = get_trans_aux a tag states in
+ (Cache.N2.add
+ a.cache2
+ (tag.QName.id :> int)
+ (states.StateSet.id :> int) trs; trs)
+ else trs
+
+
+
+let eval_form phi fcs nss ps ss is_left is_right has_left has_right kind =
+ let rec loop phi =
+ begin match SFormula.expr phi with
+ Formula.True -> true
+ | Formula.False -> false
+ | Formula.Atom a ->
+ let p, b, q = Atom.node a in
+ let pos =
+ match p with
+ | First_child -> StateSet.mem q fcs
+ | Next_sibling -> StateSet.mem q nss
+ | Parent | Previous_sibling -> StateSet.mem q ps
+ | Stay -> StateSet.mem q ss
+ | Is_first_child -> is_left
+ | Is_next_sibling -> is_right
+ | Is k -> k == kind
+ | Has_first_child -> has_left
+ | Has_next_sibling -> has_right
+ in
+ if is_move p && (not b) then
+ eprintf "Warning: Invalid negative atom %a" Atom.print a;
+ b == pos
+ | Formula.And(phi1, phi2) -> loop phi1 && loop phi2
+ | Formula.Or (phi1, phi2) -> loop phi1 || loop phi2
+ end
+ in
+ loop phi
+
+let int_of_conf is_left is_right has_left has_right kind =
+ ((Obj.magic kind) lsl 4) lor
+ ((Obj.magic is_left) lsl 3) lor
+ ((Obj.magic is_right) lsl 2) lor
+ ((Obj.magic has_left) lsl 1) lor
+ (Obj.magic has_right)
+
+let eval_trans auto ltrs fcs nss ps ss is_left is_right has_left has_right kind =
+ let i = int_of_conf is_left is_right has_left has_right kind
+ and k = (fcs.StateSet.id :> int)
+ and l = (nss.StateSet.id :> int)
+ and m = (ps.StateSet.id :> int)
+ in
+
+ let rec loop ltrs ss =
+ let j = (ltrs.TransList.id :> int)
+ and n = (ss.StateSet.id :> int) in
+ let (new_ltrs, new_ss) as res =
+ let res = Cache.N6.find auto.cache6 i j k l m n in
+ if res == dummy6 then
+ let res =
+ TransList.fold (fun trs (acct, accs) ->
+ let q, _, phi = Transition.node trs in
+ if StateSet.mem q accs then (acct, accs) else
+ if eval_form
+ phi fcs nss ps accs
+ is_left is_right has_left has_right kind
+ then
+ (acct, StateSet.add q accs)
+ else
+ (TransList.cons trs acct, accs)
+ ) ltrs (TransList.nil, ss)
+ in
+ Cache.N6.add auto.cache6 i j k l m n res; res
+ else
+ res
+ in
+ if new_ss == ss then res else
+ loop new_ltrs new_ss
+ in
+ loop ltrs ss
+
+
+
+
+