(* Copyright (C) 2004, 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/
 *)

let to_string object_to_string b =
  let layout = ref [] in
  let rec aux_h current_s =
    function
	[] -> layout := current_s::!layout
      | Box.Text (_,s)::tl -> aux_h (current_s ^ s) tl
      | (Box.Space _)::_ -> assert false
      | Box.H (_,bl)::tl -> aux_h current_s (bl@tl)
      | Box.V (_,[])::tl -> aux_h current_s tl
      | Box.V (_,[b])::tl -> aux_h current_s (b::tl)
      | Box.V (_,b::bl')::tl ->
	  aux_h current_s [b] ; 
	  aux_h (String.make (String.length current_s) ' ') (Box.V([],bl')::tl)
      | Box.Object (_,obj)::tl -> aux_h (current_s ^ (object_to_string obj)) tl
      | (Box.Action _)::tl -> assert false
  in
    aux_h "" [b] ;
    List.rev !layout

let pp_term t =
  String.concat "\n" (to_string CicAstPp.pp_term (Ast2pres.ast2box t))