(* Copyright (C) 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://cs.unibo.it/helm/.
 *)

(* the type for the callback used to saturate terms that are not
 * equalities (but have = in main conclusion) *)
type auto_type =
  int -> (* maxmeta *)
  AutoTypes.flags ->
  ProofEngineTypes.proof -> 
  Cic.context -> 
  AutoCache.cache -> 
  ProofEngineTypes.goal list ->
    Cic.substitution list * AutoCache.cache * int
    
(**
   scans the context to find all Declarations "left = right"; returns a
   list of equalities and their indexes, the maxmeta and the cache resulted
   by calling auto.
*)
val find_context_equalities:
  int -> (* maxmeta *)
  Equality.equality_bag ->
  ?auto:auto_type ->
  Cic.context -> ProofEngineTypes.proof -> (* FIXME:Why bot context and proof?*)
  AutoCache.cache -> 
    int list * Equality.equality list * int * AutoCache.cache

(**
   searches the library for equalities and operates as find_context_equalities
*)
val find_library_equalities:
  Equality.equality_bag ->
  ?auto:auto_type ->
  bool -> HMysql.dbd -> Cic.context -> ProofEngineTypes.status -> int ->
  AutoCache.cache ->  
    UriManager.UriSet.t * (UriManager.uri * Equality.equality) list * int *
    AutoCache.cache