(************************************************************************)
(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
(*   \VV/  **************************************************************)
(*    //   *      This file is distributed under the terms of the       *)
(*         *       GNU Lesser General Public License Version 2.1        *)
(************************************************************************)

(* $Id: conv_oracle.ml 6303 2004-11-16 12:37:40Z sacerdot $ *)

open Names

(* Opaque constants *)
let cst_transp = ref Cpred.full

let set_opaque_const kn = cst_transp := Cpred.remove kn !cst_transp
let set_transparent_const kn = cst_transp := Cpred.add kn !cst_transp

let is_opaque_cst kn = not (Cpred.mem kn !cst_transp)

(* Opaque variables *)
let var_transp = ref Idpred.full

let set_opaque_var kn = var_transp := Idpred.remove kn !var_transp
let set_transparent_var kn = var_transp := Idpred.add kn !var_transp

let is_opaque_var kn = not (Idpred.mem kn !var_transp)

(* Opaque reference keys *)
let is_opaque = function
  | ConstKey cst -> is_opaque_cst cst
  | VarKey id -> is_opaque_var id
  | RelKey _ -> false

(* Unfold the first only if it is not opaque and the second is opaque *)
let oracle_order k1 k2 = is_opaque k2 & not (is_opaque k1)

(* summary operations *)
type transparent_state = Idpred.t * Cpred.t
let init() = (cst_transp := Cpred.full; var_transp := Idpred.full)
let freeze () = (!var_transp, !cst_transp)
let unfreeze (vo,co) = (cst_transp := co; var_transp := vo)