X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fng_kernel%2FnCicEnvironment.ml;h=57f130546d9ed4c5a663e88119fba719d6df2e7f;hb=5f87c295e57d5c5ef9bcb13d71f19b24642355be;hp=9b33de70184bfc3e3a1d32ff44aeb6c99f585a69;hpb=e2381427bca733bd36a099002fa8b7140f7a20d0;p=helm.git

diff --git a/helm/software/components/ng_kernel/nCicEnvironment.ml b/helm/software/components/ng_kernel/nCicEnvironment.ml
index 9b33de701..57f130546 100644
--- a/helm/software/components/ng_kernel/nCicEnvironment.ml
+++ b/helm/software/components/ng_kernel/nCicEnvironment.ml
@@ -11,51 +11,49 @@
 
 (* $Id$ *)
 
+module C = NCic
+module Ref = NReference
+
 exception CircularDependency of string Lazy.t;;
 exception ObjectNotFound of string Lazy.t;;
 exception BadDependency of string Lazy.t;;
+exception BadConstraint of string Lazy.t;;
 
-let type0 = [false, NUri.uri_of_string ("cic:/matita/pts/Type.univ")]
+let type0 = []
 
-let u_eq (a1,a2) (b1,b2) = a1=b1 && NUri.eq a2 b2
+let le_constraints = ref [] (* strict,a,b *)
 
-let u_lt a b = 
-  match a,b with
-  | (false,a2), (true,b2) -> NUri.eq a2 b2
-  | _ -> false
+let rec le_path_uri avoid strict a b =
+ (not strict && NUri.eq a b) ||
+ List.exists
+  (fun (strict',x,y) ->
+     NUri.eq y b && not (List.exists (NUri.eq x) avoid) &&
+       le_path_uri (x::avoid) (strict && not strict') a x
+  ) !le_constraints
 ;;
-  
-let leq_constraints = ref []
 
-let rec path a b = 
-  List.exists (fun (x,y) -> u_eq y b && (u_eq a x || u_lt a x || path a x))
-    !leq_constraints
+let leq_path a b = le_path_uri [b] (fst a) (snd a) b;;
 
 let universe_leq a b = 
   match a, b with
-  | a,[b] -> List.for_all (fun a -> path a b) a
-  | _ -> assert false
-
-let universe_eq a b = universe_leq b a || universe_leq a b
+  | a,[(false,b)] -> List.for_all (fun a -> leq_path a b) a
+  | _,_ ->
+     raise (BadConstraint
+      (lazy "trying to check if a universe is less or equal than an inferred universe"))
 
-let add_lt_constraint a b = 
-  match a,b with
-  | [false,a2 as a],[false,_ as b] -> 
-      if path b a then (raise (Failure "universe inconsistency"));
-      leq_constraints := ((true,a2),b) :: !leq_constraints  
-  | _ -> assert false
-;;
+let universe_eq a b = universe_leq b a && universe_leq a b
 
-let add_leq_constraint a b = 
+let add_constraint strict a b = 
   match a,b with
-  | [false,_ as a],[false,b2 as b] -> 
-      if path (true,b2) a then (raise (Failure "universe inconsistency"));
-      leq_constraints := (a,b) :: !leq_constraints  
-  | _ -> assert false
+  | [false,a2],[false,b2] -> 
+      if not (le_path_uri [] strict a2 b2) then (
+        if le_path_uri [] (not strict) b2 a2 then
+         (raise (BadConstraint (lazy "universe inconsistency")));
+        le_constraints := (strict,a2,b2) :: !le_constraints)
+  | _ -> raise (BadConstraint
+          (lazy "trying to add a constraint on an inferred universe"))
 ;;
 
-
-
 let typecheck_obj,already_set = ref (fun _ -> assert false), ref false;;
 let set_typecheck_obj f =
  if !already_set then
@@ -123,69 +121,60 @@ let get_checked_obj u =
 ;;
 
 let get_checked_decl = function
-  | NReference.Ref (uri, NReference.Decl) ->
+  | Ref.Ref (uri, Ref.Decl) ->
       (match get_checked_obj uri with
-      | _,height,_,_, NCic.Constant (rlv,name,None,ty,att) ->
+      | _,height,_,_, C.Constant (rlv,name,None,ty,att) ->
           rlv,name,ty,att,height
-      | _,_,_,_, NCic.Constant (_,_,Some _,_,_) ->
+      | _,_,_,_, C.Constant (_,_,Some _,_,_) ->
           prerr_endline "get_checked_decl on a definition"; assert false
       | _ -> prerr_endline "get_checked_decl on a non decl 2"; assert false)
   | _ -> prerr_endline "get_checked_decl on a non decl"; assert false
 ;;
 
 let get_checked_def = function
-  | NReference.Ref (uri, NReference.Def _) ->
+  | Ref.Ref (uri, Ref.Def _) ->
       (match get_checked_obj uri with
-      | _,height,_,_, NCic.Constant (rlv,name,Some bo,ty,att) ->
+      | _,height,_,_, C.Constant (rlv,name,Some bo,ty,att) ->
           rlv,name,bo,ty,att,height
-      | _,_,_,_, NCic.Constant (_,_,None,_,_) ->
+      | _,_,_,_, C.Constant (_,_,None,_,_) ->
           prerr_endline "get_checked_def on an axiom"; assert false
       | _ -> prerr_endline "get_checked_def on a non def 2"; assert false)
   | _ -> prerr_endline "get_checked_def on a non def"; assert false
 ;;
 
 let get_checked_indtys = function
-  | NReference.Ref (uri, (NReference.Ind (_,n)|NReference.Con (n,_))) ->
+  | Ref.Ref (uri, (Ref.Ind (_,n,_)|Ref.Con (n,_,_))) ->
       (match get_checked_obj uri with
-      | _,_,_,_, NCic.Inductive (inductive,leftno,tys,att) ->
+      | _,_,_,_, C.Inductive (inductive,leftno,tys,att) ->
         inductive,leftno,tys,att,n
       | _ -> prerr_endline "get_checked_indtys on a non ind 2"; assert false)
   | _ -> prerr_endline "get_checked_indtys on a non ind"; assert false
 ;;
 
 let get_checked_fixes_or_cofixes = function
-  | NReference.Ref (uri, (NReference.Fix (fixno,_,_)|NReference.CoFix fixno))->
+  | Ref.Ref (uri, (Ref.Fix _|Ref.CoFix _))->
       (match get_checked_obj uri with
-      | _,height,_,_, NCic.Fixpoint (_,funcs,att) ->
+      | _,height,_,_, C.Fixpoint (_,funcs,att) ->
          funcs, att, height
       | _ ->prerr_endline "get_checked_(co)fix on a non (co)fix 2";assert false)
-  | r -> prerr_endline ("get_checked_(co)fix on " ^ NReference.string_of_reference r); assert false
-;;
-
-let get_indty_leftno = function 
-  | NReference.Ref (uri, NReference.Ind _) 
-  | NReference.Ref (uri, NReference.Con _) ->
-      (match get_checked_obj uri with
-      | _,_,_,_, NCic.Inductive (_,left,_,_) -> left
-      | _ ->prerr_endline "get_indty_leftno called on a non ind 2";assert false)
-  | _ -> prerr_endline "get_indty_leftno called on a non indty";assert false
+  | _ -> prerr_endline "get_checked_(co)fix on a non (co)fix"; assert false
 ;;
 
-let get_relevance (NReference.Ref (_, infos) as r) =
+let get_relevance (Ref.Ref (_, infos) as r) =
   match infos with
-     NReference.Def _ -> let res,_,_,_,_,_ = get_checked_def r in res
-   | NReference.Decl -> let res,_,_,_,_ = get_checked_decl r in res
-   | NReference.Ind _ ->
+     Ref.Def _ -> let res,_,_,_,_,_ = get_checked_def r in res
+   | Ref.Decl -> let res,_,_,_,_ = get_checked_decl r in res
+   | Ref.Ind _ ->
        let _,_,tl,_,n = get_checked_indtys r in
        let res,_,_,_ = List.nth tl n in
          res
-    | NReference.Con (_,i) ->
+    | Ref.Con (_,i,_) ->
        let _,_,tl,_,n = get_checked_indtys r in
        let _,_,_,cl = List.nth tl n in
        let res,_,_ = List.nth cl (i - 1) in
          res
-    | NReference.Fix (fixno,_,_)
-    | NReference.CoFix fixno ->
+    | Ref.Fix (fixno,_,_)
+    | Ref.CoFix fixno ->
         let fl,_,_ = get_checked_fixes_or_cofixes r in
         let res,_,_,_,_ = List.nth fl fixno in
           res