+ List.fold_right
+ (fun (uri, t) (b,subst) ->
+ let b1,t = aux t in
+ b||b1,(uri, t)::subst) subst (false,[])
+ in
+ snd (aux term)
+
+exception Fail of string
+
+ (** select metasenv conjecture pattern
+ * select all subterms of [conjecture] matching [pattern].
+ * It returns the set of matched terms (that can be compared using physical
+ * equality to the subterms of [conjecture]) together with their contexts.
+ * The representation of the set mimics the ProofEngineTypes.pattern type:
+ * a list of hypothesis (names of) together with the list of its matched
+ * subterms (and their contexts) + the list of matched subterms of the
+ * with their context conclusion. Note: in the result the list of hypothesis
+ * has an entry for each entry in the context and in the same order.
+ * Of course the list of terms (with their context) associated to the
+ * hypothesis name may be empty. *)
+ let select ~metasenv ~ugraph ~conjecture:(_,context,ty)
+ ~pattern:(what,hyp_patterns,goal_pattern)
+ =
+ let find_pattern_for name =
+ try Some (snd (List.find (fun (n, pat) -> Cic.Name n = name) hyp_patterns))
+ with Not_found -> None in
+ let subst,metasenv,ugraph,ty_terms =
+ select_in_term ~metasenv ~context ~ugraph ~term:ty
+ ~pattern:(what,goal_pattern) in
+ let context_len = List.length context in
+ let subst,metasenv,ugraph,context_terms =
+ let subst,metasenv,ugraph,res,_ =
+ (List.fold_right
+ (fun entry (subst,metasenv,ugraph,res,context) ->
+ match entry with
+ None -> subst,metasenv,ugraph,(None::res),(None::context)
+ | Some (name,Cic.Decl term) ->
+ (match find_pattern_for name with
+ | None ->
+ subst,metasenv,ugraph,((Some (`Decl []))::res),(entry::context)
+ | Some pat ->
+ try
+ let what =
+ match what with
+ None -> None
+ | Some what ->
+ let what,subst',metasenv' =
+ CicMetaSubst.delift_rels [] metasenv
+ (context_len - List.length context) what
+ in
+ assert (subst' = []);
+ assert (metasenv' = metasenv);
+ Some what in
+ let subst,metasenv,ugraph,terms =
+ select_in_term ~metasenv ~context ~ugraph ~term
+ ~pattern:(what,pat)
+ in
+ subst,metasenv,ugraph,((Some (`Decl terms))::res),
+ (entry::context)
+ with
+ CicMetaSubst.DeliftingARelWouldCaptureAFreeVariable ->
+ raise
+ (Fail
+ ("The term the user wants to convert is not closed " ^
+ "in the context of the position of the substitution.")))
+ | Some (name,Cic.Def (bo, ty)) ->
+ (match find_pattern_for name with
+ | None ->
+ let selected_ty=match ty with None -> None | Some _ -> Some [] in
+ subst,metasenv,ugraph,((Some (`Def ([],selected_ty)))::res),
+ (entry::context)
+ | Some pat ->
+ try
+ let what =
+ match what with
+ None -> None
+ | Some what ->
+ let what,subst',metasenv' =
+ CicMetaSubst.delift_rels [] metasenv
+ (context_len - List.length context) what
+ in
+ assert (subst' = []);
+ assert (metasenv' = metasenv);
+ Some what in
+ let subst,metasenv,ugraph,terms_bo =
+ select_in_term ~metasenv ~context ~ugraph ~term:bo
+ ~pattern:(what,pat) in
+ let subst,metasenv,ugraph,terms_ty =
+ match ty with
+ None -> subst,metasenv,ugraph,None
+ | Some ty ->
+ let subst,metasenv,ugraph,res =
+ select_in_term ~metasenv ~context ~ugraph ~term:ty
+ ~pattern:(what,pat)
+ in
+ subst,metasenv,ugraph,Some res
+ in
+ subst,metasenv,ugraph,((Some (`Def (terms_bo,terms_ty)))::res),
+ (entry::context)
+ with
+ CicMetaSubst.DeliftingARelWouldCaptureAFreeVariable ->
+ raise
+ (Fail
+ ("The term the user wants to convert is not closed " ^
+ "in the context of the position of the substitution.")))
+ ) context (subst,metasenv,ugraph,[],[]))
+ in
+ subst,metasenv,ugraph,res
+ in
+ subst,metasenv,ugraph,context_terms, ty_terms
+
+(* saturate_term newmeta metasenv context ty *)
+(* Given a type [ty] (a backbone), it returns its head and a new metasenv in *)
+(* which there is new a META for each hypothesis, a list of arguments for the *)
+(* new applications and the index of the last new META introduced. The nth *)
+(* argument in the list of arguments is just the nth new META. *)
+let saturate_term newmeta metasenv context ty =
+ let module C = Cic in
+ let module S = CicSubstitution in
+ let rec aux newmeta ty =
+ let ty' = ty in
+ match ty' with
+ C.Cast (he,_) -> aux newmeta he
+(* CSC: patch to generate ?1 : ?2 : Type in place of ?1 : Type to simulate ?1 :< Type
+ (* If the expected type is a Type, then also Set is OK ==>
+ * we accept any term of type Type *)
+ (*CSC: BUG HERE: in this way it is possible for the term of
+ * type Type to be different from a Sort!!! *)
+ | C.Prod (name,(C.Sort (C.Type _) as s),t) ->
+ (* TASSI: ask CSC if BUG HERE refers to the C.Cast or C.Propd case *)
+ let irl =
+ CicMkImplicit.identity_relocation_list_for_metavariable context
+ in
+ let newargument = C.Meta (newmeta+1,irl) in
+ let (res,newmetasenv,arguments,lastmeta) =
+ aux (newmeta + 2) (S.subst newargument t)
+ in
+ res,
+ (newmeta,[],s)::(newmeta+1,context,C.Meta (newmeta,[]))::newmetasenv,
+ newargument::arguments,lastmeta
+*)
+ | C.Prod (name,s,t) ->
+ let irl =
+ CicMkImplicit.identity_relocation_list_for_metavariable context
+ in
+ let newargument = C.Meta (newmeta,irl) in
+ let (res,newmetasenv,arguments,lastmeta) =
+ aux (newmeta + 1) (S.subst newargument t)
+ in
+ let s' = CicReduction.normalize ~delta:false context s in
+ res,(newmeta,context,s')::newmetasenv,newargument::arguments,lastmeta
+ (** NORMALIZE RATIONALE
+ * we normalize the target only NOW since we may be in this case:
+ * A1 -> A2 -> T where T = (\lambda x.A3 -> P) k
+ * and we want a mesasenv with ?1:A1 and ?2:A2 and not
+ * ?1, ?2, ?3 (that is the one we whould get if we start from the
+ * beta-normalized A1 -> A2 -> A3 -> P **)
+ | t -> (CicReduction.normalize ~delta:false context t),[],[],newmeta