(* 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/
 *)

class type script =
object

  (** @return current status *)
  method status: MatitaTypes.status
    
  (** {2 Observers} *)

  method addObserver : (MatitaTypes.status -> unit) -> unit

  (** {2 History} *)

  method advance : ?statement:string -> unit -> unit
  method retract : unit -> unit
  method goto: [`Top | `Bottom | `Cursor] -> unit -> unit
  method reset: unit -> unit

  (** {2 Load/save} *)

  method assignFileName : string -> unit (* to the current active file *)
  method loadFromFile : unit -> unit
  method saveToFile : unit -> unit

  (** {2 Current proof} (if any) *)

  (** @return true if there is an ongoing proof, false otherise *)
  method onGoingProof: unit -> bool

  method proofStatus: ProofEngineTypes.status (** @raise Statement_error *)
  method proofMetasenv: Cic.metasenv          (** @raise Statement_error *)
  method proofContext: Cic.context            (** @raise Statement_error *)

  method setGoal: int -> unit

  (** end of script, true if the whole script has been executed *)
  method eos: bool
  
  (* debug *)
  method dump : unit -> unit

end

  (** @param set_star callback used to set the modified symbol (usually a star
   * "*") on the side of a script name *)
val script: 
  buffer:GText.buffer -> 
  init:MatitaTypes.status -> 
  mathviewer: MatitaTypes.mathViewer-> 
  urichooser: (UriManager.uri list -> UriManager.uri list) -> 
  ask_confirmation: 
    (title:string -> message:string -> [`YES | `NO | `CANCEL]) -> 
  set_star: (string -> bool -> unit) ->
  unit -> 
    script

(* each time script above is called an internal ref is set, instance will return
 * the value of this ref *)
(* TODO Zack: orrible solution until we found a better one for having a single
 * access point for the script *)
val instance: unit -> script