- sort inclusion must be restricted to term backbone in order to avoid

[helm.git] / helm / software / lambda-delta / basic_rg / brg.ml

diff --git a/helm/software/lambda-delta/basic_rg/brg.ml b/helm/software/lambda-delta/basic_rg/brg.ml
index 45777ead4f41d41dcc1ab793d5473a35b54df016..5ad05a72f7da075221bedd10490b63900ddcf438 100644 (file)
--- a/helm/software/lambda-delta/basic_rg/brg.ml
+++ b/helm/software/lambda-delta/basic_rg/brg.ml
@@ -9,18 +9,91 @@
      \ /   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