-module U = NUri
-module A = Aut
+(*
+ ||M|| This file is part of HELM, an Hypertextual, Electronic
+ ||A|| Library of Mathematics, developed at the Computer Science
+ ||T|| Department, University of Bologna, Italy.
+ ||I||
+ ||T|| HELM is free software; you can redistribute it and/or
+ ||A|| modify it under the terms of the GNU General Public License
+ \ / version 2 or (at your option) any later version.
+ \ / This software is distributed as is, NO WARRANTY.
+ V_______________________________________________________________ *)
-type uri = U.uri
-type id = A.id
+(* kernel version: basic, relative, global *)
+(* note : ufficial basic lambda-delta *)
-type binder = Abst | Abbr
+type uri = Entity.uri
+type id = Entity.id
+type attrs = Entity.attrs
-type term = Sort of int
- | LRef of int
- | GRef of uri
- | Cast of term * term
- | Appl of term * term
- | Bind of id * binder * term * term
-
+type bind = Void (* *)
+ | Abst of term (* type *)
+ | Abbr of term (* body *)
+
+and term = Sort of attrs * int (* attrs, hierarchy index *)
+ | LRef of attrs * int (* attrs, position index *)
+ | GRef of attrs * uri (* attrs, reference *)
+ | Cast of attrs * term * term (* attrs, type, term *)
+ | Appl of attrs * term * term (* attrs, argument, function *)
+ | Bind of attrs * bind * term (* attrs, binder, scope *)
+
+type entity = term Entity.entity (* attrs, uri, binder *)
+
+type lenv = Null
+(* Cons: tail, relative local environment, attrs, binder *)
+ | Cons of lenv * lenv * attrs * bind
+
+(* helpers ******************************************************************)
+
+let mk_uri root s =
+ String.concat "/" ["ld:"; "brg"; root; s ^ ".ld"]
+
+(* Currified constructors ***************************************************)
+
+let abst w = Abst w
+
+let abbr v = Abbr v
+
+let lref a i = LRef (a, i)
+
+let cast a u t = Cast (a, u, t)
+
+let appl a u t = Appl (a, u, t)
+
+let bind a b t = Bind (a, b, t)
+
+let bind_abst a u t = Bind (a, Abst u, t)
+
+let bind_abbr a v t = Bind (a, Abbr v, t)
+
+let bind_void a t = Bind (a, Void, t)
+
+(* local environment handling functions *************************************)
+
+let empty = Null
+
+let push e c a b = Cons (e, c, a, b)
+
+let rec get i = function
+ | Null -> Null, Null, [], Void
+ | Cons (e, c, a, b) when i = 0 -> e, c, a, b
+ | Cons (e, _, _, _) -> get (pred i) e
+
+let get e i = get i e
+
+(* used in BrgOutput.pp_lenv *)
+let rec fold_right f map e x = match e with
+ | Null -> f x
+ | Cons (e, c, a, b) -> fold_right (map f e c a b) map e x
+
+(* used in MetaBrg.unwind_to_xlate_term *)
+let rec fold_left map x = function
+ | Null -> x
+ | Cons (e, _, a, b) -> fold_left map (map x a b) e