\ / 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 = Item.uri
+type id = Item.id
-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 attr = Name of bool * id (* real?, name *)
+ | Apix of int (* additional position index *)
-type obj = int * uri * bind * term (* age, uri, binder, contents *)
+type attrs = attr list
-type item = obj option
+type bind = Void (* exclusion *)
+ | Abst of term (* abstraction *)
+ | Abbr of term (* abbreviation *)
+
+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 obj = bind Item.obj (* age, uri, binder *)
+
+type item = bind Item.item
+
+type context = Null
+(* Cons: tail, relative context, attrs, binder *)
+ | Cons of context * context option * attrs * bind
+
+type message = (context, term) Log.item list
+
+(* 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)
+
+(* context handling functions ***********************************************)
+
+let empty_context = Null
+
+let push f es ?c a b =
+ let es = Cons (es, c, a, b) in f es
+
+let get err f es i =
+ let rec aux j = function
+ | Null -> err i
+ | Cons (tl, None, a, b) when j = 0 -> f tl a b
+ | Cons (_, Some c, a, b) when j = 0 -> f c a b
+ | Cons (tl, _, _, _) -> aux (pred j) tl
+ in
+ aux i es
+
+let rec rev_iter f map = function
+ | Null -> f ()
+ | Cons (tl, None, a, b) ->
+ let f () = map f tl a b in rev_iter f map tl
+ | Cons (tl, Some c, a, b) ->
+ let f () = map f c a b in rev_iter f map tl
+
+let rec fold_left f map x = function
+ | Null -> f x
+ | Cons (tl, _, a, b) ->
+ let f x = fold_left f map x tl in
+ map f x a b
+
+let rec name err f = function
+ | [] -> err ()
+ | Name (r, n) :: _ -> f n r
+ | _ :: tl -> name err f tl
+
+let rec apix err f = function
+ | [] -> err ()
+ | Apix i :: _ -> f i
+ | _ :: tl -> apix err f tl