(* Copyright (C) 2000-2002, 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/.
 *)


let in_hypothesis = "'http://www.cs.unibo.it/helm/schemas/schema-helm#InHypothesis'" ;;

let main_hypothesis = "'http://www.cs.unibo.it/helm/schemas/schema-helm#MainHypothesis'" ;;

let main_conclusion = "'http://www.cs.unibo.it/helm/schemas/schema-helm#MainConclusion'" ;;

let in_conclusion = "'http://www.cs.unibo.it/helm/schemas/schema-helm#InConclusion'" ;;

let escape = Str.global_replace (Str.regexp_string "\'") "\\'";;

let hyp_const (conn:Mysql.dbd) uri =
  let uri = escape uri in
  (*query to obtain all the constants in the hypothesis of the theorem*)
  let query =
     "select h_occurrence from refObj where source='"^uri^
    "' and (h_position="^main_hypothesis^" or h_position="^in_hypothesis^
    "or h_position="^main_conclusion^" or h_position="^in_conclusion^")" in
  prerr_endline ("$$$$$$$$$$$$$$$"^query);
  let result = Mysql.exec conn query in 
  (* now we transform the result in a set *)
  let f a = 
    match (Array.to_list a) with
	[Some uri] -> uri
      | _ -> assert false in
  let result = Mysql.map ~f:f result in
  List.fold_left 
    (fun set uri ->
       NewConstraints.StringSet.add uri set)
    NewConstraints.StringSet.empty result
;;

(* for each uri check if its costants are a subset of
   const, the set of the costants of the proof *)
let filter_new_constants (conn:Mysql.dbd) const (_,uri) =
   let hyp = hyp_const conn uri in
   prerr_endline (NewConstraints.pp_StringSet hyp);
    NewConstraints.StringSet.subset hyp const
;;