X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Flambda-delta%2Fbasic_rg%2Fbrg.ml;h=e42db3319b5739aea2bb9f00218b102f411adf35;hb=be0ca791abbf1084b7218f2d17ab48462fbb3049;hp=45777ead4f41d41dcc1ab793d5473a35b54df016;hpb=25fba20748a951f7061188cc5fabece8f5ac97b9;p=helm.git

diff --git a/helm/software/lambda-delta/basic_rg/brg.ml b/helm/software/lambda-delta/basic_rg/brg.ml
index 45777ead4..e42db3319 100644
--- a/helm/software/lambda-delta/basic_rg/brg.ml
+++ b/helm/software/lambda-delta/basic_rg/brg.ml
@@ -9,18 +9,80 @@
      \ /   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
 
-type bind = Abst | Abbr (* abstraction, abbreviation *)
+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 *)
+
+and attr = Name of bool * id   (* real?, name *)
+         | Entry of int * bind (* age, binder *)
 
-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 *)
+and attrs = attr list
 
-type obj = int * uri * bind * term (* age, uri, binder, contents *)
+type obj = int * uri * bind (* age, uri, binder, contents *)
 
 type item = obj option
+
+type context = (attrs * bind) list (* attrs, binder *) 
+
+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 = []
+
+let push f es a b =
+   let c = (a, b) :: es in f c
+
+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