(* 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/.
 *)

(***************************************************************************)
(*                                                                         *)
(*                             PROJECT HELM                                *)
(*                                                                         *)
(*                  29/01/2003 Claudio Sacerdoti Coen                      *)
(*                                                                         *)
(*                                                                         *)
(***************************************************************************)

open MatitaTypes

(* List utility functions *)
exception Skip;;

let list_map_fail f =
 let rec aux =
  function
     [] -> []
   | he::tl ->
      try
       let he' = f he in
        he'::(aux tl)
      with Skip ->
       (aux tl)
 in
  aux
;;
(* End of the list utility functions *)

class sequent_viewer ~(mml_of_cic_sequent:mml_of_cic_sequent) obj =
 object(self)

  inherit GMathViewAux.multi_selection_math_view obj

  val mutable current_infos = None

  method get_selected_terms =
   let selections = self#get_selections in
    list_map_fail
     (function node ->
       let xpath =
        ((node : Gdome.element)#getAttributeNS
          ~namespaceURI:Misc.helmns
          ~localName:(Gdome.domString "xref"))#to_string
       in
        if xpath = "" then assert false (* "ERROR: No xref found!!!" *)
        else
         match current_infos with
            Some (ids_to_terms,_,_) ->
             let id = xpath in
              (try
                Hashtbl.find ids_to_terms id
               with _ -> raise Skip)
          | None -> assert false (* "ERROR: No current term!!!" *)
     ) selections

  method get_selected_hypotheses =
   let selections = self#get_selections in
    list_map_fail
     (function node ->
       let xpath =
        ((node : Gdome.element)#getAttributeNS
          ~namespaceURI:Misc.helmns
          ~localName:(Gdome.domString "xref"))#to_string
       in
        if xpath = "" then assert false (* "ERROR: No xref found!!!" *)
        else
         match current_infos with
            Some (_,_,ids_to_hypotheses) ->
             let id = xpath in
              (try
                Hashtbl.find ids_to_hypotheses id
               with _ -> raise Skip)
          | None -> assert false (* "ERROR: No current term!!!" *)
     ) selections
  
  method load_sequent metasenv sequent =
   let sequent_mml,(ids_to_terms,ids_to_father_ids,ids_to_hypotheses) =
     mml_of_cic_sequent metasenv sequent
   in
    self#load_root ~root:sequent_mml#get_documentElement ;
     current_infos <-
      Some (ids_to_terms,ids_to_father_ids,ids_to_hypotheses)
 end
;;

class proof_viewer ~(mml_of_cic_object:mml_of_cic_object) obj =
 object(self)

  inherit GMathViewAux.single_selection_math_view obj

  val mutable current_infos = None
  val mutable current_mml = None

  method load_proof uri currentproof =
    let
      (acic,ids_to_terms,ids_to_father_ids,ids_to_inner_sorts,
       ids_to_inner_types,ids_to_conjectures,ids_to_hypotheses)
      = Cic2acic.acic_object_of_cic_object currentproof
    in
    let mml =
      mml_of_cic_object
        ~explode_all:true uri acic ids_to_inner_sorts ids_to_inner_types
    in
    current_infos <-
      Some
       (ids_to_terms,ids_to_father_ids,ids_to_conjectures,ids_to_hypotheses);
    (match current_mml with
      None ->
        self#load_root ~root:mml#get_documentElement ;
        current_mml <- Some mml
    | Some current_mml' ->
        self#freeze ;
        XmlDiff.update_dom ~from:current_mml' mml ;
        self#thaw);
    (acic, ids_to_inner_types, ids_to_inner_sorts)
  end

 (** constructors *)

let sequent_viewer ~(mml_of_cic_sequent: mml_of_cic_sequent) =
  GtkBase.Widget.size_params
    ~cont:(OgtkMathViewProps.pack_return (fun p ->
      OgtkMathViewProps.set_params
        (new sequent_viewer ~mml_of_cic_sequent
          (GtkMathViewProps.MathView_GMetaDOM.create p))
        ?font_size:None ?log_verbosity:None))
    ?width:None ?height:None []

let proof_viewer ~(mml_of_cic_object: mml_of_cic_object) =
  GtkBase.Widget.size_params
    ~cont:(OgtkMathViewProps.pack_return (fun p ->
      OgtkMathViewProps.set_params
        (new proof_viewer ~mml_of_cic_object
          (GtkMathViewProps.MathView_GMetaDOM.create p))
        ?font_size:None ?log_verbosity:None))
    ?width:None ?height:None []