-(* serve una funzione che cerchi nel ty dal basso a partire da term, i lambda
-e li aggiunga nel context, poi si conta la lunghezza di questo nuovo
-contesto e si lifta di tot... COSA SIGNIFICA TUTTO CIO'?????? *)
-
-let generalize_tac
- ?(mk_fresh_name_callback = ProofEngineHelpers.mk_fresh_name)
- terms ~status:((proof,goal) as status)
-=
- let module C = Cic in
- let module P = PrimitiveTactics in
- let module T = Tacticals in
- let _,metasenv,_,_ = proof in
- let _,context,ty = List.find (function (m,_,_) -> m=goal) metasenv in
- let typ =
- match terms with
- [] -> assert false
- | he::tl ->
- (* We need to check that all the convertibility of all the terms *)
- List.iter
- (function t ->
- if not (CicReduction.are_convertible context he t) then
- raise AllSelectedTermsMustBeConvertible
- ) tl ;
- (CicTypeChecker.type_of_aux' metasenv context he)
- in
- T.thens
- ~start:
- (P.cut_tac
- (C.Prod(
- (mk_fresh_name_callback context C.Anonymous typ),
- typ,
- (ProofEngineReduction.replace_lifting_csc 1
- ~equality:(==)
- ~what:terms
- ~with_what:(List.map (function _ -> C.Rel 1) terms)
- ~where:ty)
- )))
- ~continuations: [(P.apply_tac ~term:(C.Rel 1)) ; T.id_tac]
- ~status
+let generalize_tac
+ ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~subst:[])
+ pattern
+ =
+ let module PET = ProofEngineTypes in
+ let generalize_tac mk_fresh_name_callback
+ ~pattern:(term,hyps_pat,concl_pat) status
+ =
+ if hyps_pat <> [] then raise GeneralizationInHypothesesNotImplementedYet;
+ let (proof, goal) = status in
+ let module C = Cic in
+ let module P = PrimitiveTactics in
+ let module T = Tacticals in
+ let _,metasenv,_,_ = proof in
+ let (_,context,ty) as conjecture = CicUtil.lookup_meta goal metasenv in
+ let selected_hyps,terms_with_context =
+ ProofEngineHelpers.select ~metasenv ~conjecture ~pattern in
+ let typ,term =
+ match terms_with_context, term with
+ [], None ->
+ raise UnableToDetectTheTermThatMustBeGeneralizedYouMustGiveItExplicitly
+ | _, Some term
+ | (_,term)::_, None ->
+ fst
+ (CicTypeChecker.type_of_aux' metasenv context term
+ CicUniv.empty_ugraph),
+ term in
+ (* We need to check:
+ 1. whether they live in the context of the goal;
+ if they do they are also well-typed since they are closed subterms
+ of a well-typed term in the well-typed context of the well-typed
+ term
+ 2. whether they are convertible
+ *)
+ ignore (
+ (* TASSI: FIXME *)
+ List.fold_left
+ (fun u (context_of_t,t) ->
+ (* 1 *)
+ begin
+ try
+ ignore
+ (CicMetaSubst.delift_rels [] metasenv
+ (List.length context_of_t - List.length context) t)
+ with
+ CicMetaSubst.DeliftingARelWouldCaptureAFreeVariable ->
+ raise TheSelectedTermsMustLiveInTheGoalContext
+ end;
+ (* 2 *)
+ let b,u1 = CicReduction.are_convertible context term t u in
+ if not b then
+ raise AllSelectedTermsMustBeConvertible
+ else
+ u1
+ ) CicUniv.empty_ugraph terms_with_context) ;
+ PET.apply_tactic
+ (T.thens
+ ~start:
+ (P.cut_tac
+ (C.Prod(
+ (mk_fresh_name_callback metasenv context C.Anonymous ~typ:typ),
+ typ,
+ (ProofEngineReduction.replace_lifting_csc 1
+ ~equality:(==)
+ ~what:(List.map snd terms_with_context)
+ ~with_what:(List.map (function _ -> C.Rel 1) terms_with_context)
+ ~where:ty)
+ )))
+ ~continuations:
+ [(P.apply_tac ~term:(C.Appl [C.Rel 1; CicSubstitution.lift 1 term])) ;
+ T.id_tac])
+ status
+ in
+ PET.mk_tactic (generalize_tac mk_fresh_name_callback ~pattern)