* http://cs.unibo.it/helm/.
*)
-(*CSC: generatore di nomi? Chiedere il nome? *)
-let fresh_name =
- let next_fresh_index = ref 0 in
- function
- Cic.Anonymous ->
- incr next_fresh_index ;
- "fresh_name" ^ string_of_int !next_fresh_index
- | Cic.Name name ->
- incr next_fresh_index ;
- name ^ string_of_int !next_fresh_index
+(* mk_fresh_name context name typ *)
+(* returns an identifier which is fresh in the context *)
+(* and that resembles [name] as much as possible. *)
+(* [typ] will be the type of the variable *)
+let mk_fresh_name context name ~typ =
+ let module C = Cic in
+ let basename =
+ match name with
+ C.Anonymous ->
+ (*CSC: great space for improvements here *)
+ (try
+ (match CicTypeChecker.type_of_aux' [] context typ with
+ C.Sort C.Prop -> "H"
+ | C.Sort C.Set -> "x"
+ | _ -> "H"
+ )
+ with _ ->
+ "H"
+ )
+ | C.Name name ->
+ Str.global_replace (Str.regexp "[0-9]*$") "" name
+ in
+ let already_used name =
+ List.exists (function Some (C.Name n,_) -> n=name | _ -> false) context
+ in
+ if not (already_used basename) then
+ C.Name basename
+ else
+ let rec try_next n =
+ let name' = basename ^ string_of_int n in
+ if already_used name' then
+ try_next (n+1)
+ else
+ C.Name name'
+ in
+ try_next 1
+;;
(* identity_relocation_list_for_metavariable i canonical_context *)
(* returns the identity relocation list, which is the list [1 ; ... ; n] *)