(* $Id: terms.mli 9822 2009-06-03 15:37:06Z tassi $ *)
-let eqPref = ref (fun _ -> assert false);;
-let set_eqP t = eqPref := fun _ -> t;;
-
-let default_eqP() =
+let default_eqP =
let uri = NUri.uri_of_string "cic:/matita/basics/logic/eq.ind" in
let ref = NReference.reference_of_spec uri (NReference.Ind(true,0,2)) in
NCic.Const ref
;;
+let eqPref = ref default_eqP;;
+let set_eqP t = eqPref := t;;
+
let equivalence_relation =
let uri = NUri.uri_of_string "cic:/matita/ng/properties/relations/eq_rel.con"
in
;;
- let compare x y =
+ let rec alpha_norm k = function
+ | NCic.Lambda (_,ty,t) ->
+ NCic.Lambda("_",alpha_norm k ty,alpha_norm k t)
+ | NCic.Prod (_,ty,t) ->
+ NCic.Prod("_",alpha_norm k ty,alpha_norm k t)
+ | NCic.LetIn (_,ty,t,b) ->
+ NCic.LetIn("_",alpha_norm k ty,alpha_norm k t,alpha_norm k b)
+ | NCic.Meta (_,(_,NCic.Irl _)) as t -> t
+ | NCic.Meta (n,(s,NCic.Ctx tl)) as t ->
+ let tl' = HExtlib.sharing_map (alpha_norm k) tl in
+ if tl == tl' then t else NCic.Meta (n,(s,NCic.Ctx tl'))
+ | t -> NCicUtils.map ~hbr:false (new NCicPp.status None)
+ (fun _ _ -> ()) () alpha_norm t
+
+ (* let compare x y =
(* CSC: NCicPp.status is the best I can put here *)
(* WR: and I can't guess a user id, so I must put None *)
if NCicReduction.alpha_eq (new NCicPp.status None) [] [] [] x y then 0
(* if x = y then 0 *)
else compare x y
- ;;
+ ;; *)
- let eqP = (!eqPref)()
+ let eqP = fun () -> !eqPref
;;
let is_eq = function
- | Terms.Node [ Terms.Leaf eqt ; ty; l; r ] when eq eqP eqt ->
+ | Terms.Node [ Terms.Leaf eqt ; ty; l; r ] when eq (eqP()) eqt ->
Some (ty,l,r)
+ | Terms.Node [ Terms.Leaf eqt ; ty; l; r ] ->
+ None
(*
| Terms.Node [ Terms.Leaf eqt ; _; Terms.Node [Terms.Leaf eqt2 ; ty]; l; r]
when eq equivalence_relation eqt && eq setoid_eq eqt2 ->
let res,vars = List.fold_left
(fun (r,v) t -> let r1,v1 = embed t in (r1::r),aux [] v v1) ([],[]) l
in (Terms.Node (List.rev res)), vars
- | t -> Terms.Leaf t, []
+ | t -> Terms.Leaf (alpha_norm () t), []
;;
let embed t = fst (embed t) ;;