+(* Copyright (C) 2004, HELM Team.
+ *
+ * This file is part of HELM, an Hypertextual, Electronic
+ * Library of Mathematics, developed at the Computer Science
+ * Department, University of Bologna, Italy.
+ *
+ * HELM is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * HELM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HELM; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ *
+ * For details, see the HELM World-Wide-Web page,
+ * http://cs.unibo.it/helm/.
+ *)
+
+(* 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
+ | C.Sort C.CProp -> "H"
+ | C.Sort C.Set -> "x"
+ | _ -> "H"
+ )
+ with CicTypeChecker.TypeCheckerFailure _ -> "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
+;;