(* Copyright (C) 2004-2005, 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://helm.cs.unibo.it/
 *)

(* $Id$ *)

let alias_diff ~from status = 
  let module Map = DisambiguateTypes.Environment in
  Map.fold
    (fun domain_item codomain_item acc ->
      let description1 = GrafiteAst.description_of_alias codomain_item in
      try
       let description2 = 
          GrafiteAst.description_of_alias 
            (Map.find domain_item from#lstatus.LexiconTypes.aliases)
       in
        if description1 <> description2 then
         (domain_item,codomain_item)::acc
        else
          acc
      with
       Not_found ->
         (domain_item,codomain_item)::acc)
    status#lstatus.LexiconTypes.aliases []
;;

let add_aliases_for_objs status =
 List.fold_left
  (fun status nref ->
    let references = NCicLibrary.aliases_of nref in
    let new_env =
     List.map
      (fun u ->
        let name = NCicPp.r2s true u in
         DisambiguateTypes.Id name,
          GrafiteAst.Ident_alias (name,NReference.string_of_reference u)
      ) references
    in
     LexiconEngine.set_proof_aliases status GrafiteAst.WithPreferences new_env
  ) status