(***********************************************************************)
(*  v      *   The Coq Proof Assistant  /  The Coq Development Team    *)
(* <O___,, *        INRIA-Rocquencourt  &  LRI-CNRS-Orsay              *)
(*   \VV/  *************************************************************)
(*    //   *      This file is distributed under the terms of the      *)
(*         *       GNU Lesser General Public License Version 2.1       *)
(***********************************************************************)

(*i $Id$ i*)

(*i*)
open Names
open Sign
open Term
open Environ
open Libnames
open Nametab
(*i*)

type constr_pattern =
  | PRef of global_reference
  | PVar of identifier
  | PEvar of existential_key
  | PRel of int
  | PApp of constr_pattern * constr_pattern array
  | PSoApp of int * constr_pattern list
  | PLambda of name * constr_pattern * constr_pattern
  | PProd of name * constr_pattern * constr_pattern
  | PLetIn of name * constr_pattern * constr_pattern
  | PSort of Rawterm.rawsort
  | PMeta of int option
  | PCase of case_style * constr_pattern option * constr_pattern * 
      constr_pattern array
  | PFix of fixpoint
  | PCoFix of cofixpoint

val occur_meta_pattern : constr_pattern -> bool

val subst_pattern : substitution -> constr_pattern -> constr_pattern

type constr_label =
  | ConstNode of constant
  | IndNode of inductive
  | CstrNode of constructor
  | VarNode of identifier

val label_of_ref : global_reference -> constr_label

val subst_label : substitution -> constr_label -> constr_label

exception BoundPattern

(* [head_pattern_bound t] extracts the head variable/constant of the
   type [t] or raises [BoundPattern] (even if a sort); it raises an anomaly
   if [t] is an abstraction *)

val head_pattern_bound : constr_pattern -> constr_label

(* [head_of_constr_reference c] assumes [r] denotes a reference and
   returns its label; raises an anomaly otherwise *)

val head_of_constr_reference : Term.constr -> constr_label

(* [pattern_of_constr c] translates a term [c] with metavariables into
   a pattern; currently, no destructor (Cases, Fix, Cofix) and no
   existential variable are allowed in [c] *)

val pattern_of_constr : constr -> constr_pattern

(* [pattern_of_rawconstr l c] translates a term [c] with metavariables into
   a pattern; variables bound in [l] are replaced by the pattern to which they
    are bound *)

val pattern_of_rawconstr : Rawterm.rawconstr -> int list * constr_pattern

val instantiate_pattern :
  (identifier * constr_pattern) list -> constr_pattern -> constr_pattern