(* Copyright (C) 2000, 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/.
 *)

type check_status = Checked | Unchecked;;

let hashtable = Hashtbl.create 17;;

let get_term_and_type_checking_info uri =
 try
  Hashtbl.find hashtable uri
 with
  Not_found -> 
   let filename = Getter.get uri in
    let term = TheoryParser.theory_of_xml filename in
     Hashtbl.add hashtable uri (term, Unchecked) ;
     (term, Unchecked)
;;


let get_theory uri =
 fst (get_term_and_type_checking_info uri)
;;

let is_type_checked uri =
 match snd (get_term_and_type_checking_info uri) with
    Checked   -> true
  | Unchecked -> false
;;

let set_type_checking_info uri =
 match Hashtbl.find hashtable uri with
  (term, _) ->
   Hashtbl.remove hashtable uri ;
   Hashtbl.add hashtable uri (term, Checked)
;;