(************************************************************************)
(*  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        *)
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(*i $Id$ i*)

(*i*)
open Names
open Term
open Environ
open Evd
open Reductionops
open Closure
open Rawterm
(*i*)

(*s Reduction functions associated to tactics. \label{tacred} *)

val is_evaluable : env -> evaluable_global_reference -> bool

exception Redelimination

(* Red (raise Redelimination if nothing reducible) *)
val red_product : reduction_function

(* Hnf *)
val hnf_constr :  reduction_function

(* Simpl *)
val nf :  reduction_function

(* Unfold *)
val unfoldn : 
  (int list * evaluable_global_reference) list ->  reduction_function

(* Fold *)
val fold_commands : constr list ->  reduction_function

(* Pattern *)
val pattern_occs : (int list * constr) list ->  reduction_function
(* Rem: Lazy strategies are defined in Reduction *)

(* Call by value strategy (uses Closures) *)
val cbv_norm_flags : Closure.RedFlags.reds ->  reduction_function
  val cbv_beta : local_reduction_function
  val cbv_betaiota : local_reduction_function
  val cbv_betadeltaiota :  reduction_function
  val compute :  reduction_function  (* = [cbv_betadeltaiota] *)

(* Call by value strategy (uses virtual machine) *)
val cbv_vm : reduction_function

(* [reduce_to_atomic_ind env sigma t] puts [t] in the form [t'=(I args)]
   with [I] an inductive definition;
   returns [I] and [t'] or fails with a user error *)
val reduce_to_atomic_ind : env ->  evar_map -> types -> inductive * types

(* [reduce_to_quantified_ind env sigma t] puts [t] in the form
   [t'=(x1:A1)..(xn:An)(I args)] with [I] an inductive definition;
   returns [I] and [t'] or fails with a user error *)
val reduce_to_quantified_ind : env ->  evar_map -> types -> inductive * types

(* [reduce_to_quantified_ref env sigma ref t] try to put [t] in the form
   [t'=(x1:A1)..(xn:An)(ref args)] and raise Not_found if not possible *)
val reduce_to_quantified_ref :
  env ->  evar_map -> Libnames.global_reference -> types -> types

val reduce_to_atomic_ref :
  env ->  evar_map -> Libnames.global_reference -> types -> types

type red_expr = (constr, evaluable_global_reference) red_expr_gen

val contextually : bool -> constr occurrences -> reduction_function
  -> reduction_function
val reduction_of_redexp : red_expr -> reduction_function

val declare_red_expr : string -> reduction_function -> unit

(* Opaque and Transparent commands. *)
val set_opaque_const      : constant -> unit
val set_transparent_const : constant -> unit

val set_opaque_var      : identifier -> unit
val set_transparent_var : identifier -> unit