\ / This software is distributed as is, NO WARRANTY.
V_______________________________________________________________ *)
-type uri = NUri.uri
-type id = Aut.id
+(* kernel version: basic, relative, global *)
+(* note : ufficial basic lambda-delta *)
-type bind = Abst | Abbr (* abstraction, abbreviation *)
+type uri = Entity.uri
+type id = Entity.id
+type attrs = Entity.attrs
-type term = Sort of int (* hierarchy index *)
- | LRef of int (* reverse de Bruijn index *)
- | GRef of uri (* reference *)
- | Cast of term * term (* type, term *)
- | Appl of term * term (* argument, function *)
- | Bind of id * bind * term * term (* name, binder, content, scope *)
+type bind = Void (* *)
+ | Abst of term (* type *)
+ | Abbr of term (* body *)
-type obj = bind * term (* binder, contents *)
+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 item = (obj * uri) option (* uri, object *)
+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