(***********************************************************************)
(*                                                                     *)
(*                               TAToo                                 *)
(*                                                                     *)
(*                  Lucca Hirschi, ?                                   *)
(*                  ?                                                  *)
(*                                                                     *)
(*  Copyright 2010-2012 Université Paris-Sud and Centre National de la *)
(*  Recherche Scientifique. All rights reserved.  This file is         *)
(*  distributed under the terms of the GNU Lesser General Public       *)
(*  License, with the special exception on linking described in file   *)
(*  ../LICENSE.                                                        *)
(*                                                                     *)
(***********************************************************************)

(** Implementation of alternating selecting tree automata (ASTA) *)


type state = State.t
(** The type of states *)

type label = QNameSet.t
(** The type of labels of the transitions *)

type formula = Formula.t
(** The type of transition formulae *)

type transition = (state*label*formula)
(** The type of transitions *)

type t
(** The type of ASTAs *)

val transition : t -> state -> label -> formula
(** Give the formula which must hold for a current state and label *)

val transitions : t -> state -> ((label*formula) list)*((label*formula) list)
(** Give the list of labels and formulae from queries and recognizing
    transitions for a given state *)

val empty : t
(** The empty automaton *)

val any_label : label
(** Set of all labels which can occur in a tree *)

val new_state : unit -> state
(** Give a new state (different from all others states) *)

val add_tr : t -> transition -> bool -> unit
(** Add a query transition (recognizing transition if flag=false) to an asta *) 

val add_reco : t -> state -> unit
(** Add a state to the recognizing states of an asta *)

val add_quer : t -> state -> unit
(** Add a state to the query states of an asta *)

val add_selec : t -> state -> unit
(** Add a state to the selecting states of an asta *)

val add_bot : t -> state -> unit
(** Add a state to the bottom states of an asta *)

val add_top : t -> state -> unit
(** Add a state to the top states of an asta *)

val init_top : t -> unit
(** Remove all top states *)

val top_states : t -> state list
(** Give the list of top states of an ASTA *)

val print : Format.formatter -> t -> unit
(** Pretty printer *)

val to_file : out_channel -> t -> unit
(** Outputs the description of the automaton on the given out_channel *)