(* Copyright (C) 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/.
 *)

val id_tac : ProofEngineTypes.tactic
val fail_tac: ProofEngineTypes.tactic

module type Status =
 sig
   type input_status
   type output_status
   type tactic
   val id_tac : tactic
   val mk_tactic : (input_status -> output_status) -> tactic
   val apply_tactic : tactic -> input_status -> output_status
   val goals : output_status -> ProofEngineTypes.goal list
   val set_goals: output_status -> ProofEngineTypes.goal list -> output_status
   val focus : output_status -> ProofEngineTypes.goal -> input_status
 end

module type T =
 sig
  type tactic

  val first: tactics: (string * tactic) list -> tactic

  val thens: start: tactic -> continuations: tactic list -> tactic

  val then_: start: tactic -> continuation: tactic -> tactic

   (** "folding" of then_ *)
  val seq: tactics: tactic list -> tactic

  val repeat_tactic: tactic: tactic -> tactic

  val do_tactic: n: int -> tactic: tactic -> tactic 

  val try_tactic: tactic: tactic -> tactic 

  val solve_tactics: tactics: (string * tactic) list -> tactic
 end

module Make (S:Status) : T with type tactic = S.tactic

include T with type tactic = ProofEngineTypes.tactic