- let demodulate_once_old ~jump_to_right bag (id, literal, vl, pr) table =
- match literal with
- | Terms.Predicate t -> assert false
- | Terms.Equation (l,r,ty,_) ->
- let left_position = if jump_to_right then None else
- first_position [2]
- (fun x -> Terms.Node [ Terms.Leaf B.eqP; ty; x; r ]) l
- (demod table vl)
- in
- match left_position with
- | Some (newt, subst, id2, dir, pos) ->
- begin
- match build_clause bag (fun _ -> true) Terms.Demodulation
- newt subst id id2 pos dir
- with
- | None -> assert false
- | Some x -> Some (x,false)
- end
- | None ->
- match first_position
- [3] (fun x -> Terms.Node [ Terms.Leaf B.eqP; ty; l; x ]) r
- (demod table vl)
- with
- | None -> None
- | Some (newt, subst, id2, dir, pos) ->
- match build_clause bag (fun _ -> true)
- Terms.Demodulation newt subst id id2 pos dir
- with
- | None -> assert false
- | Some x -> Some (x,true)
+ let mydemod table varlist subterm =
+ let cands =
+ prof_demod_r.HExtlib.profile
+ (IDX.DT.retrieve_generalizations table) subterm
+ in
+ list_first
+ (fun (dir, ((id,lit,vl,_) as c)) ->
+ debug (lazy("candidate: "
+ ^ Pp.pp_unit_clause c));
+ match lit with
+ | Terms.Predicate _ -> assert false
+ | Terms.Equation (l,r,_,o) ->
+ let side, newside = if dir=Terms.Left2Right then l,r else r,l in
+ try
+ let subst =
+ prof_demod_u.HExtlib.profile
+ (Unif.unification (* (varlist@vl) *) varlist subterm) side
+ in
+ let iside =
+ prof_demod_s.HExtlib.profile
+ (Subst.apply_subst subst) side
+ in
+ let inewside =
+ prof_demod_s.HExtlib.profile
+ (Subst.apply_subst subst) newside
+ in
+ if o = Terms.Incomparable || o = Terms.Invertible then
+ let o =
+ prof_demod_o.HExtlib.profile
+ (Order.compare_terms inewside) iside in
+ (* Riazanov, pp. 45 (ii) *)
+ if o = Terms.Lt then
+ Some (newside, subst, id, dir)
+ else
+ ((*prerr_endline ("Filtering: " ^
+ Pp.pp_foterm side ^ " =(< || =)" ^
+ Pp.pp_foterm newside ^ " coming from " ^
+ Pp.pp_unit_clause uc );*)
+ debug (lazy "not applied");None)
+ else
+ Some (newside, subst, id, dir)
+ with FoUnif.UnificationFailure _ ->
+ debug (lazy "not applied"); None)
+ (IDX.ClauseSet.elements cands)