+ match id with
+ None ->
+ (match ty with
+ None -> Tacticals.id_tac (*BUG: check missing here *)
+ | Some ty ->
+ Tactics.change ~pattern:(ProofEngineTypes.conclusion_pattern None)
+ (fun _ metasenv ugraph -> ty,metasenv,ugraph))
+ | Some id ->
+ let aux status =
+ let cont,cutted =
+ match ty with
+ None -> Tacticals.id_tac,t
+ | Some ty ->
+ Tactics.change ~pattern:(None,[id,Cic.Implicit (Some `Hole)],None)
+ (fun _ metasenv ugraph -> t,metasenv,ugraph), ty in
+ let proof,goals =
+ ProofEngineTypes.apply_tactic
+ (Tacticals.thens
+ ~start:
+ (Tactics.cut cutted
+ ~mk_fresh_name_callback:(fun _ _ _ ~typ -> Cic.Name id))
+ ~continuations:[cont])
+ status
+ in
+ let goals' =
+ match goals with
+ [fst; snd] -> [snd; fst]
+ | _ -> assert false
+ in
+ proof,goals'
+ in
+ ProofEngineTypes.mk_tactic aux
+;;
+
+let existselim ~dbd ~universe t id1 t1 id2 t2 =
+ let aux (proof, goal) =
+ let (n,metasenv,_subst,bo,ty,attrs) = proof in
+ let metano,context,_ = CicUtil.lookup_meta goal metasenv in
+ let t2, metasenv, _ = t2 (Some (Cic.Name id1, Cic.Decl t1) :: context) metasenv CicUniv.oblivion_ugraph in
+ let proof' = (n,metasenv,_subst,bo,ty,attrs) in
+ ProofEngineTypes.apply_tactic (
+ Tacticals.thens
+ ~start:(Tactics.cut (Cic.Appl [Cic.MutInd (UriManager.uri_of_string "cic:/matita/logic/connectives/ex.ind", 0, []); t1 ; Cic.Lambda (Cic.Name id1, t1, t2)]))
+ ~continuations:
+ [ Tactics.elim_intros (Cic.Rel 1)
+ ~mk_fresh_name_callback:
+ (let i = ref 0 in
+ fun _ _ _ ~typ ->
+ incr i;
+ if !i = 1 then Cic.Name id1 else Cic.Name id2) ;
+ (match t with
+ | None -> Tactics.auto ~dbd ~params:([],[]) ~universe
+ | Some t -> Tactics.apply t)
+ ]) (proof', goal)
+ in
+ ProofEngineTypes.mk_tactic aux
+;;
+
+let andelim t id1 t1 id2 t2 =
+ Tactics.elim_intros t
+ ~mk_fresh_name_callback:
+ (let i = ref 0 in
+ fun _ _ _ ~typ ->
+ incr i;
+ if !i = 1 then Cic.Name id1 else Cic.Name id2)
+
+let rewritingstep ~dbd ~universe lhs rhs just last_step =
+ let aux ((proof,goal) as status) =
+ let (curi,metasenv,_subst,proofbo,proofty, attrs) = proof in
+ let _,context,gty = CicUtil.lookup_meta goal metasenv in
+ let eq,trans =
+ match LibraryObjects.eq_URI () with
+ None -> raise (ProofEngineTypes.Fail (lazy "You need to register the default equality first. Please use the \"default\" command"))
+ | Some uri ->
+ Cic.MutInd (uri,0,[]), Cic.Const (LibraryObjects.trans_eq_URI ~eq:uri,[])
+ in
+ let ty,_ =
+ CicTypeChecker.type_of_aux' metasenv context rhs CicUniv.oblivion_ugraph in
+ let just' =
+ match just with
+ `Auto (univ, params) ->
+ let params =
+ if not (List.exists (fun (k,_) -> k = "timeout") params) then
+ ("timeout","3")::params
+ else params
+ in
+ let params' =
+ if not (List.exists (fun (k,_) -> k = "paramodulation") params) then
+ ("paramodulation","1")::params
+ else params
+ in
+ if params = params' then
+ Tactics.auto ~dbd ~params:(univ, params) ~universe
+ else
+ Tacticals.first
+ [Tactics.auto ~dbd ~params:(univ, params) ~universe ;
+ Tactics.auto ~dbd ~params:(univ, params') ~universe]
+ | `Term just -> Tactics.apply just
+ | `SolveWith term ->
+ Tactics.solve_rewrite ~universe ~params:([term],["steps","1"]) ()
+ | `Proof ->
+ Tacticals.id_tac