(* Copyright (C) 2000, 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                                 *)
(*                                                                            *)
(*                Claudio Sacerdoti Coen <sacerdot@cs.unibo.it>               *)
(*                                 24/01/2000                                 *)
(*                                                                            *)
(* This module implements a trival cache system (an hash-table) for cic       *)
(* objects. Uses the getter (getter.ml) and the parser (cicParser.ml)         *)
(*                                                                            *)
(******************************************************************************)

exception CircularDependency of string;;

(* get_obj uri                                                                *)
(* returns the cic object whose uri is uri. If the term is not just in cache, *)
(* then it is parsed via CicParser.term_of_xml from the file whose name is    *)
(* the result of Getter.get uri                                               *)
val get_obj : UriManager.uri -> Cic.obj

type type_checked_obj =
   CheckedObj of Cic.obj    (* cooked obj *)
 | UncheckedObj of Cic.obj  (* uncooked obj *)

(* is_type_checked uri cookingsno                                   *)
(*CSC commento falso ed obsoleto *)
(* returns (true,object) if the object has been type-checked        *)
(* otherwise it returns (false,object) and freeze the object for    *)
(* type-checking                                                    *)
(* set_type_checking_info must be called to unfreeze the object     *)
val is_type_checked : ?trust:bool -> UriManager.uri -> type_checked_obj

(* set_type_checking_info uri                                         *)
(* must be called once the type-checking of uri is finished           *)
(* The object whose uri is uri is unfreezed and won't be type-checked *)
(* again in the future (is_type_checked will return true)             *)
val set_type_checking_info : UriManager.uri -> unit

(* get_cooked_obj ~trust uri                                        *)
(* returns the object if it is already type-checked or if it can be *)
(* trusted (if [trust] = true and the trusting function accepts it) *)
(* Otherwise it raises Not_found                                    *)
val get_cooked_obj : ?trust:bool -> UriManager.uri -> Cic.obj

(* FUNCTIONS USED ONLY IN THE TOPLEVEL/PROOF-ENGINE *)

exception OnlyPutOfInductiveDefinitionsIsAllowed

(* put_inductive_definition uri obj                                      *)
(* put [obj] (that must be an InductiveDefinition and show URI is [uri]) *)
(* in the environment.                                                   *)
(* WARNING: VERY UNSAFE.                                                 *)
(* This function should be called only on a well-typed definition.       *)
val put_inductive_definition : UriManager.uri -> Cic.obj -> unit

(* (de)serialization *)
val dump_to_channel : ?callback:(string -> unit) -> out_channel -> unit
val restore_from_channel : ?callback:(string -> unit) -> in_channel -> unit
val empty : unit -> unit

(* for filtering in tacticChaser *)
(* NEW *)
val in_cache : UriManager.uri -> bool