some more work for ng-coercions

[helm.git] / helm / software / components / ng_kernel / nCicEnvironment.ml

diff --git a/helm/software/components/ng_kernel/nCicEnvironment.ml b/helm/software/components/ng_kernel/nCicEnvironment.ml
index f31c4e9b1ebbc71416ced0dbbc120e4bf60c7448..b3b1eda16eab228c19944d7f7f176e2ffd6433e9 100644 (file)
--- a/helm/software/components/ng_kernel/nCicEnvironment.ml
+++ b/helm/software/components/ng_kernel/nCicEnvironment.ml
@@ -18,6 +18,14 @@ exception CircularDependency of string Lazy.t;;
 exception ObjectNotFound 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 = []
 
@@ -67,6 +75,14 @@ let pp_constraints () =
 
 let universes = ref [];;
 
+let get_universes () = List.map (fun x -> [false,x]) !universes;;
+
+let is_declared u =
+ match u with
+    [false,x] -> List.exists (fun y -> NUri.eq x y) !universes
+  | _ -> assert false
+;;
+
 let add_constraint strict a b = 
   match a,b with
   | [false,a2],[false,b2] -> 
@@ -76,7 +92,8 @@ let add_constraint strict a b =
            ^ " 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)
+        le_constraints := (strict,a2,b2) :: !le_constraints);
+        history := (`Constr (strict,a,b))::!history;
   | _ -> raise (BadConstraint
           (lazy "trying to add a constraint on an inferred universe"))
 ;;
@@ -109,60 +126,93 @@ 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 (strict,[_,u1],[_,u2]) as c -> 
+          let w = strict,u1,u2 in
+          if not(List.mem c !history) then 
+           le_constraints := List.filter ((<>) w) !le_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',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;
-         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