X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Flambda-delta%2Fbasic_rg%2Fbrg.ml;h=e42db3319b5739aea2bb9f00218b102f411adf35;hb=4dc87cc7384ba61136bc82a23effe6a52160e720;hp=17532c970f32f234a4f5d5654e852a36834b63a4;hpb=41bf338d7e638ebb5d97e525055bff05b1f0f045;p=helm.git

diff --git a/helm/software/lambda-delta/basic_rg/brg.ml b/helm/software/lambda-delta/basic_rg/brg.ml
index 17532c970..e42db3319 100644
--- a/helm/software/lambda-delta/basic_rg/brg.ml
+++ b/helm/software/lambda-delta/basic_rg/brg.ml
@@ -9,6 +9,9 @@
      \ /   This software is distributed as is, NO WARRANTY.              
       V_______________________________________________________________ *)
 
+(* kernel version: basic, relative, global *)
+(* note          : ufficial basic lambda-delta *) 
+
 type uri = NUri.uri
 type id = Aut.id
 
@@ -16,54 +19,70 @@ type bind = Void         (* exclusion *)
           | Abst of term (* abstraction *)
           | Abbr of term (* abbreviation *)
 
-and 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 (* name, binder, scope *)
+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 *)
+
+and attr = Name of bool * id   (* real?, name *)
+         | Entry of int * bind (* age, binder *)
+
+and attrs = attr list
 
 type obj = int * uri * bind (* age, uri, binder, contents *)
 
 type item = obj option
 
-type context = int * (id * bind) list
+type context = (attrs * bind) list (* attrs, binder *) 
 
 type message = (context, term) Log.item list
 
-type hierarchy = int -> int
-
 (* Currified constructors ***************************************************)
 
 let abst w = Abst w
 
 let abbr v = Abbr v
 
-let cast u t = Cast (u, t)
+let lref a i = LRef (a, i)
 
-let appl u t = Appl (u, t)
+let cast a u t = Cast (a, u, t)
 
-let bind id b t = Bind (id, b, t)
+let appl a u t = Appl (a, u, t)
 
-(* context handling functions ***********************************************)
+let bind a b t = Bind (a, b, t)
 
-let empty_context = 0, []
+let bind_abst a u t = Bind (a, Abst u, t)
 
-let push f (l, es) id b =
-   let c = succ l, (id, b) :: es in 
-   f c
+let bind_abbr a v t = Bind (a, Abbr v, t)
 
-let append f (l1, es1) (l2, es2) =
-   f (l2 + l1, List.append es2 es1)
+(* context handling functions ***********************************************)
 
-let map f map (l, es) =
-   let f es = f (l, es) in
-   Cps.list_map f map es
+let empty_context = []
 
-let contents f (l, es) = f l es
+let push f es a b =
+   let c = (a, b) :: es in f c
 
-let get f (l, es) i =
-   if i < 0 || i >= l then f None else 
-   let result = List.nth es (l - succ i) in
-   f (Some result)
+let append f es1 es2 = 
+   f (List.append es2 es1)
+
+let map f map es =
+   Cps.list_map f map es
 
+let contents f es = f es
+
+let get f es i =
+   let rec aux e i = function
+      | []       -> f e None
+      | hd :: tl -> 
+         if i = 0 then f e (Some hd) else 
+	 let e = match hd with _, Abst _ -> succ e | _ -> e in  
+	 aux e (pred i) tl
+   in
+   aux 0 i es
+
+let rec name f = function
+   | []               -> f None
+   | Name (r, n) :: _ -> f (Some (r, n))
+   | _ :: tl          -> name f tl