X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fng_kernel%2FnCicEnvironment.ml;h=893e514b1fef9f642a212997aa92e54be2c0533c;hb=ec07ff398325533d848da92e9dc69852d24b78a5;hp=0ddd3601db02f4502f0cc0d9780adaff6b74584a;hpb=1ee5193677b8e2a80d4f068ee79ecac335de1196;p=helm.git

diff --git a/helm/software/components/ng_kernel/nCicEnvironment.ml b/helm/software/components/ng_kernel/nCicEnvironment.ml
index 0ddd3601d..893e514b1 100644
--- a/helm/software/components/ng_kernel/nCicEnvironment.ml
+++ b/helm/software/components/ng_kernel/nCicEnvironment.ml
@@ -16,73 +16,190 @@ module Ref = NReference
 
 exception CircularDependency of string Lazy.t;;
 exception ObjectNotFound of string Lazy.t;;
-exception BadDependency of string Lazy.t;;
+exception BadDependency of string Lazy.t * exn;;
 exception BadConstraint of string Lazy.t;;
+exception AlreadyDefined of string Lazy.t;;
+
+let cache = NUri.UriHash.create 313;;
+let history = ref [];;
+let frozen_list = ref [];;
+
+let get_obj = ref (fun _ -> assert false);;
+let set_get_obj f = get_obj := f;;
 
 let type0 = []
 
-let le_constraints = ref [] (* strict,a,b *)
+module F = Format 
+
+let rec ppsort f = function
+  | C.Prop -> F.fprintf f "Prop"
+  | (C.Type []) -> F.fprintf f "Type0"
+  | (C.Type [`Type, u]) -> F.fprintf f "%s" (NUri.name_of_uri u)
+  | (C.Type [`Succ, u]) -> F.fprintf f "S(%s)" (NUri.name_of_uri u)
+  | (C.Type [`CProp, u]) -> F.fprintf f "P(%s)" (NUri.name_of_uri u)
+  | (C.Type l) -> 
+      F.fprintf f "Max(";
+      ppsort f ((C.Type [List.hd l]));
+      List.iter (fun x -> F.fprintf f ",";ppsort f ((C.Type [x]))) (List.tl l);
+      F.fprintf f ")"
+;;
+
+let string_of_univ u =
+  let b = Buffer.create 100 in
+  let f = Format.formatter_of_buffer b in
+  ppsort f (NCic.Type u);
+  Format.fprintf f "@?";
+  Buffer.contents b
+;;
 
-let rec le_path_uri avoid strict a b =
- (not strict && NUri.eq a b) ||
+let eq_univ (b1,u1) (b2,u2) = b1=b2 && NUri.eq u1 u2;;
+
+let max (l1:NCic.universe) (l2:NCic.universe) =
+ match l2 with
+ | x::tl -> 
+    let rest = List.filter (fun y -> not (eq_univ x y)) (l1@tl) in
+    x :: HExtlib.list_uniq ~eq:eq_univ
+      (List.sort (fun (b1,u1) (b2,u2) ->
+         let res = compare b1 b2 in 
+         if res = 0 then NUri.compare u1 u2 else res)
+      rest)
+ | [] -> 
+     match l1 with
+     | [] -> []
+     | ((`Type|`Succ), _)::_ -> l1
+     | (`CProp, u)::tl -> (`Type, u)::tl
+;;
+
+let lt_constraints = ref [] (* a,b := a < b *)
+
+let rec lt_path_uri avoid 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
+  (fun (x,y) ->
+      NUri.eq y b && 
+     (NUri.eq a x ||
+        (not (List.exists (NUri.eq x) avoid) &&
+        lt_path_uri (x::avoid) a x))
+  ) !lt_constraints
 ;;
 
-let leq_path a b = le_path_uri [b] (fst a) (snd a) b;;
+let lt_path a b = lt_path_uri [b] a b;;
+
+let universe_eq a b = 
+  match a,b with 
+  | [(`Type|`CProp) as b1, u1], [(`Type|`CProp) as b2, u2] -> 
+         b1 = b2 && NUri.eq u1 u2
+  | _, [(`Type|`CProp),_]
+  | [(`Type|`CProp),_],_ -> false
+  | _ ->
+     raise (BadConstraint
+      (lazy "trying to check if two inferred universes are equal"))
+;;
 
 let universe_leq a b = 
   match a, b with
-  | 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"))
+  | (((`Type|`Succ),_)::_ | []) , [`CProp,_] -> false
+  | l, [((`Type|`CProp),b)] -> 
+       List.for_all 
+         (function 
+         | `Succ,a -> lt_path a b 
+         | _, a -> NUri.eq a b || lt_path a b) l
+  | _, ([] | [`Succ,_] | _::_::_) -> 
+     raise (BadConstraint (lazy (
+       "trying to check if "^string_of_univ a^
+       " is leq than the inferred universe " ^ string_of_univ b)))
+;;
 
-let universe_eq a b = universe_leq b a && universe_leq a b
+let are_sorts_convertible ~test_eq_only s1 s2 =
+   match s1,s2 with
+   | C.Type a, C.Type b when not test_eq_only -> universe_leq a b
+   | C.Type a, C.Type b -> universe_eq a b
+   | C.Prop,C.Type _ -> (not test_eq_only)
+   | C.Prop, C.Prop -> true
+   | _ -> false
+;;
 
-let pp_constraint b x y =  
-  NUri.name_of_uri x ^ (if b then " < " else " <= ") ^ NUri.name_of_uri y
+let pp_constraint x y =  
+  NUri.name_of_uri x ^ " < " ^ NUri.name_of_uri y
 ;;
 
 let pp_constraints () =
-  String.concat "\n" (List.map (fun (b,x,y) -> pp_constraint b x y) !le_constraints)
+  String.concat "\n" (List.map (fun (x,y) -> pp_constraint x y) !lt_constraints)
 ;;
 
 let universes = ref [];;
 
-let add_constraint strict a b = 
+let get_universes () = 
+  List.map (fun x -> [`Type,x]) !universes @
+  List.map (fun x -> [`CProp,x]) !universes
+;;
+
+let is_declared u =
+ match u with
+ | [(`CProp|`Type),x] -> List.exists (fun y -> NUri.eq x y) !universes
+ | _ -> assert false
+;;
+
+exception UntypableSort of string Lazy.t
+exception AssertFailure of string Lazy.t
+
+let typeof_sort = function
+  | C.Type ([(`Type|`CProp),u] as univ) ->
+     if is_declared univ then (C.Type [`Succ, u])
+     else 
+       raise (UntypableSort (lazy ("undeclared universe " ^
+         NUri.string_of_uri u ^ "\ndeclared ones are: " ^ 
+         String.concat ", " (List.map NUri.string_of_uri !universes)
+     )))
+  | C.Type t -> 
+      raise (AssertFailure (lazy (
+              "Cannot type an inferred type: "^ string_of_univ t)))
+  | C.Prop -> (C.Type type0)
+;;
+
+let add_lt_constraint a b = 
   match a,b with
-  | [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 adding "^pp_constraint strict a2 b2
+  | [`Type,a2],[`Type,b2] -> 
+      if not (lt_path_uri [] a2 b2) then (
+        if lt_path_uri [] b2 a2 || NUri.eq a2 b2 then
+         (raise(BadConstraint(lazy("universe inconsistency adding "^
+                    pp_constraint a2 b2
            ^ " to:\n" ^ pp_constraints ()))));
         universes := a2 :: b2 :: 
           List.filter (fun x -> not (NUri.eq x a2 || NUri.eq x b2)) !universes;
-        le_constraints := (strict,a2,b2) :: !le_constraints)
+        lt_constraints := (a2,b2) :: !lt_constraints);
+      history := (`Constr (a,b))::!history;
   | _ -> raise (BadConstraint
           (lazy "trying to add a constraint on an inferred universe"))
 ;;
 
 let sup l =
   match l with
-  | [false,_] -> Some l
+  | [(`Type|`CProp),_] -> Some l
   | l ->
-   let bigger_than acc (s1,n1) = List.filter (le_path_uri [] s1 n1) acc in
+   let bigger_than acc (_s1,n1) = 
+     List.filter (fun x -> lt_path_uri [] n1 x || NUri.eq n1 x) acc 
+   in
    let solutions = List.fold_left bigger_than !universes l in
+   let fam = match l with (`CProp,_)::_ -> `CProp | _ -> `Type in
    let rec aux = function
      | [] -> None
      | u :: tl ->
-         if List.exists (fun x -> le_path_uri [] true x u) solutions then aux tl
-         else Some [false,u]
+         if List.exists (fun x -> lt_path_uri [] x u) solutions then aux tl
+         else Some [fam,u]
    in
     aux solutions
 ;;
 
+let allowed_sort_elimination s1 s2 =
+  match s1, s2 with
+  | C.Type (((`Type|`Succ),_)::_ | []), C.Type (((`Type|`Succ),_)::_ | []) 
+  | C.Type _, C.Type ((`CProp,_)::_) 
+  | C.Type _, C.Prop
+  | C.Prop, C.Prop -> `Yes
 
+  | C.Type ((`CProp,_)::_), C.Type (((`Type|`Succ),_)::_ | [])
+  | C.Prop, C.Type _ -> `UnitOnly
+;;
 
 let typecheck_obj,already_set = ref (fun _ -> assert false), ref false;;
 let set_typecheck_obj f =
@@ -95,59 +212,93 @@ let set_typecheck_obj f =
   end
 ;;
 
-let cache = NUri.UriHash.create 313;;
-let frozen_list = ref [];;
+let invalidate_item item =
+ let item_eq a b = 
+   match a, b with
+   | `Obj (u1,_), `Obj (u2,_) -> NUri.eq u1 u2
+   | `Constr _, `Constr _ -> a=b (* MAKE EFFICIENT *)
+   | _ -> false
+ in
+ let rec aux to_be_deleted =
+  function
+     [] -> assert false
+   | item'::tl when item_eq item item' -> item'::to_be_deleted,tl
+   | item'::tl -> aux (item'::to_be_deleted) tl
+ in
+  let to_be_deleted,h = aux [] !history in
+   history := h;
+   List.iter 
+     (function 
+     | `Obj (uri,_) -> NUri.UriHash.remove cache uri
+     | `Constr ([_,u1],[_,u2]) as c -> 
+          let w = u1,u2 in
+          if not(List.mem c !history) then 
+           lt_constraints := List.filter ((<>) w) !lt_constraints;
+     | `Constr _ -> assert false
+     ) to_be_deleted
+;;
 
 exception Propagate of NUri.uri * exn;;
 
+let to_exn f x =
+ match f x with
+    `WellTyped o -> o
+  | `Exn e -> raise e
+;;
+
+let check_and_add_obj ((u,_,_,_,_) as obj) =
+ let saved_frozen_list = !frozen_list in
+ try
+   frozen_list := (u,obj)::saved_frozen_list;
+   !typecheck_obj obj;
+   frozen_list := saved_frozen_list;
+   let obj' = `WellTyped obj in
+   NUri.UriHash.add cache u obj';
+   history := (`Obj (u,obj))::!history;
+   obj'
+ with
+    Sys.Break as e ->
+     frozen_list := saved_frozen_list;
+     raise e
+  | Propagate (u',old_exn) as e' ->
+     frozen_list := saved_frozen_list;
+     let exn = `Exn (BadDependency (lazy (NUri.string_of_uri u ^
+       " depends (recursively) on " ^ NUri.string_of_uri u' ^
+       " which is not well-typed"), 
+       match old_exn with BadDependency (_,e) -> e | _ -> old_exn)) in
+     NUri.UriHash.add cache u exn;
+     history := (`Obj (u,obj))::!history;
+     if saved_frozen_list = [] then
+      exn
+     else
+      raise e'
+  | e ->
+     frozen_list := saved_frozen_list;
+     let exn = `Exn e in
+     NUri.UriHash.add cache u exn;
+     history := (`Obj (u,obj))::!history;
+     if saved_frozen_list = [] then
+      exn
+     else
+      raise (Propagate (u,e))
+;;
+
 let get_checked_obj u =
  if List.exists (fun (k,_) -> NUri.eq u k) !frozen_list
  then
   raise (CircularDependency (lazy (NUri.string_of_uri u)))
  else
-  let obj =
-   try NUri.UriHash.find cache u
-   with
-    Not_found ->
-     let saved_frozen_list = !frozen_list in
-     try
-      let obj =
-       try NCicLibrary.get_obj u
-       with
-        NCicLibrary.ObjectNotFound m -> raise (ObjectNotFound m)
-      in
-        frozen_list := (u,obj)::saved_frozen_list;
-        !typecheck_obj obj;
-        frozen_list := saved_frozen_list;
-        let obj = `WellTyped obj in
-        NUri.UriHash.add cache u obj;
-        obj
-     with
-        Sys.Break as e ->
-         frozen_list := saved_frozen_list;
-         raise e
-      | Propagate (u',_) as e' ->
-         frozen_list := saved_frozen_list;
-         let exn = `Exn (BadDependency (lazy (NUri.string_of_uri u ^
-           " depends (recursively) on " ^ NUri.string_of_uri u' ^
-           " which is not well-typed"))) in
-         NUri.UriHash.add cache u exn;
-         if saved_frozen_list = [] then
-          exn
-         else
-          raise e'
-      | e ->
-         frozen_list := saved_frozen_list;
-         let exn = `Exn e in
-         NUri.UriHash.add cache u exn;
-         if saved_frozen_list = [] then
-          exn
-         else
-          raise (Propagate (u,e))
-  in
-   match obj with
-      `WellTyped o -> o
-    | `Exn e -> raise e
+  try NUri.UriHash.find cache u
+  with Not_found -> check_and_add_obj (!get_obj u)
+;;
+
+let get_checked_obj u = to_exn get_checked_obj u;;
+
+let check_and_add_obj ((u,_,_,_,_) as obj) =
+ if NUri.UriHash.mem cache u then
+  raise (AlreadyDefined (lazy (NUri.string_of_uri u)))
+ else
+  ignore (to_exn check_and_add_obj obj)
 ;;
 
 let get_checked_decl = function