+++ /dev/null
-(*
- ||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_______________________________________________________________ *)
-
-(* kernel version: basic, relative, global *)
-(* note : ufficial basic lambda-delta *)
-
-type uri = Entity.uri
-type id = Entity.id
-type attrs = Entity.attrs
-
-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 si root s =
- let kernel = if si then "brg-si" else "brg" in
- String.concat "/" ["ld:"; kernel; 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