(* 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/.
 *)

type sort =
 | Prop
 | Set
 | Type of int
 | CProp

type implicit_annotation = [ `Closed | `Type | `Hole | `Term ]

type name = Name of string | Anonymous

type local_context = int * (term list) option         (* shift (0 -> no shift), 
                                                         subst (None means id) *) 

and term =
 | Rel      of int                                    (* DeBruijn index, 1 based         *)
 | Meta     of int * string option * local_context
 | Appl     of term list                              (* arguments                       *)
 | Prod     of name * term * term                     (* binder, source, target          *)
 | Lambda   of name * term * term                     (* binder, source, target          *)
 | LetIn    of name * term * term * term              (* binder, type, term, body        *)
 | Const    of NUriManager.uri                         (* uri contains indtypeno/constrno *)
 | Sort     of sort                                   (* sort                            *)
 | Implicit of implicit_annotation                    (* ... *)
 | MutCase  of NUriManager.uri *                      (* ind. uri,             *)
    term * term *                                   (*  outtype, ind. term   *)
    term list                                       (*  patterns             *)

and obj =
 | Constant of term option * term
 | InductiveDefinition of inductiveType list    (* inductive types,         *)

and inductiveType = 
 string * bool * term *                       (* typename, inductive, arity *)
  constructor list                            (*  constructors              *)

and constructor =
 string * term                                (* id, type *)