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-- C730004.A
--
--                             Grant of Unlimited Rights
--
--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
--     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained 
--     unlimited rights in the software and documentation contained herein.
--     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making 
--     this public release, the Government intends to confer upon all 
--     recipients unlimited rights  equal to those held by the Government.  
--     These rights include rights to use, duplicate, release or disclose the 
--     released technical data and computer software in whole or in part, in 
--     any manner and for any purpose whatsoever, and to have or permit others 
--     to do so.
--
--                                    DISCLAIMER
--
--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED 
--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE 
--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
--     PARTICULAR PURPOSE OF SAID MATERIAL.
--*
--
-- OBJECTIVE:
--      Check that for a type declared in a package, descendants of the package
--      use the full view of type.  Specifically check that full view of the
--      limited type is visible only in private descendants (children) and in
--      the private parts and bodies of public descendants (children).
--      Check that a limited type may be used as an out parameter outside
--      the package that defines the type.
--
-- TEST DESCRIPTION:
--      This test defines a parent package containing limited private type 
--      definitions. Children packages are defined (one public, one private) 
--      that use the nonlimited full view of the types defined in the private 
--      part of the parent specification.
--      The main declares a procedure with an out parameter that was defined
--      as limited in the specification of the parent package.
--
--
-- CHANGE HISTORY:
--      15 Sep 95   SAIC    Initial prerelease version.
--      23 Apr 96   SAIC    Added prefix for parameter in Call_Modify_File.
--      02 Nov 96   SAIC    ACVC 2.1: Modified prologue and Test.Report. 
--
--!

package C730004_0 is 

   -- Full views of File_Descriptor, File_Mode, File_Name, and File_Type are
   -- are nonlimited.

   type File_Descriptor is limited private;

   type File_Mode is limited private;

   Active_Mode  : constant File_Mode;

   type File_Name is limited private;

   type File_Type is limited private;

   function Next_Available_File return File_Descriptor;

private

   type File_Descriptor is new Integer;

   Null_File    : constant File_Descriptor := 0;
   First_File   : constant File_Descriptor := 1;

   type File_Mode is 
     (Read_Only, Write_Only, Read_Write, Archived, Corrupt, Lost);

   Default_Mode : constant File_Mode       := Read_Only;
   Active_Mode  : constant File_Mode       := Read_Write;

   type File_Name is array (1 .. 6) of Character;

   Null_String : File_Name := "      ";
   String1     : File_Name := "ACVC  ";
   String2     : File_Name := "  1995";

   type File_Type is 
     record
        Descriptor : File_Descriptor := Null_File;
        Mode       : File_Mode       := Default_Mode;
        Name       : File_Name       := Null_String;
     end record;

end C730004_0;       

     --=================================================================--

package body C730004_0 is     

   File_Count : Integer := 0;

   function Next_Available_File return File_Descriptor is
   begin
      File_Count := File_Count + 1;
      return (File_Descriptor(File_Count));    -- Type conversion.
   end Next_Available_File;

end C730004_0;     

     --=================================================================--

private
package C730004_0.C730004_1 is                             -- private child

   -- Since full view of the nontagged File_Name is nonlimited in the parent 
   -- package, it is not limited in the private child, so concatenation is 
   -- available.

   System_File_Name :  constant File_Name
                    := String1(1..4) & String2(5..6);

   -- Since full view of the nontagged File_Type is nonlimited in the parent 
   -- package, it is not limited in the private child, so a default expression
   -- is available.

   function New_File_Validated (File :  File_Type 
                                     := (Descriptor => First_File,
                                         Mode       => Active_Mode,
                                         Name       => System_File_Name))
     return Boolean;

   -- Since full view of the nontagged File_Type is nonlimited in the parent 
   -- package, it is not limited in the private child, so initialization
   -- expression in an object declaration is available.

   System_File      :  File_Type 
                    := (Null_File, Read_Only, System_File_Name);


end C730004_0.C730004_1;    

     --=================================================================--

package body C730004_0.C730004_1 is 

   function New_File_Validated (File :  File_Type 
                                     := (Descriptor => First_File,
                                         Mode       => Active_Mode,
                                         Name       => System_File_Name))
     return Boolean is                                   
      Result : Boolean := False;                         
   begin                                                 
      if (File.Descriptor > System_File.Descriptor) and  
         (File.Mode in Read_Only .. Read_Write) and (File.Name = "ACVC95")
      then
         Result := True;
      end if;

      return (Result);

   end New_File_Validated;

end C730004_0.C730004_1;       

     --=================================================================--

package C730004_0.C730004_2 is                   -- public child

   -- File_Type is limited here.

   procedure Create_File (File : out File_Type);    
                          
   procedure Modify_File (File : out File_Type);

   type File_Dir is limited private;

   -- The following three validation functions provide the capability to 
   -- check the limited private types defined in the parent and the
   -- private child package from within the client program.
                                   
   function  Validate_Create (File : in File_Type) return Boolean;

   function  Validate_Modification (File : in File_Type) 
     return Boolean;

   function  Validate_Dir (Dir : in File_Dir) return Boolean;

private

   -- Since full view of the nontagged File_Type is nonlimited in the parent 
   -- package, it is not limited in the private part of the public child, so 
   -- aggregates are available.

   Child_File :  File_Type 
              := File_Type'(Descriptor => Null_File, 
                            Mode       => Write_Only,
                            Name       => String2);
                     
   -- Since full view of the nontagged component File_Type is nonlimited in 
   -- the parent package, it is not limited in the private part of the public 
   -- child, so default expressions are available.

   type File_Dir is 
     record
        Comp : File_Type := Child_File;
     end record;

end C730004_0.C730004_2;             

     --=================================================================--

with C730004_0.C730004_1;

package body C730004_0.C730004_2 is  

   procedure Create_File (File : out File_Type) is
      New_File : File_Type;

   begin
      New_File.Descriptor := Next_Available_File;       
      New_File.Mode       := Default_Mode;
      New_File.Name       := C730004_0.C730004_1.System_File_Name;

      if C730004_0.C730004_1.New_File_Validated (New_File) then
         File := New_File;
      else 
         File := (Null_File, Lost, "MISSED");
      end if;

   end Create_File;

   --------------------------------------------------------------
   procedure Modify_File (File : out File_Type) is
   begin
      File.Descriptor := Next_Available_File;      
      File.Mode       := Active_Mode;
      File.Name       := String1;
   end Modify_File;     

   --------------------------------------------------------------
   function  Validate_Create (File : in File_Type) return Boolean is
   begin
      if ((File.Descriptor /= Child_File.Descriptor) and
          (File.Mode = Read_Only) and (File.Name = "ACVC95"))
      then
         return True;
      else
         return False;
      end if;
   end Validate_Create;
  
   ------------------------------------------------------------------------
   function  Validate_Modification (File : in File_Type) 
      return Boolean is      
   begin
      if ((File.Descriptor /= C730004_0.C730004_1.System_File.Descriptor) and 
          (File.Mode = Read_Write) and (File.Name = "ACVC  "))
      then
         return True;
      else
         return False;
      end if;
   end Validate_Modification;

   ------------------------------------------------------------------------
   function  Validate_Dir (Dir : in File_Dir) return Boolean is      
   begin
      if ((Dir.Comp.Descriptor = C730004_0.C730004_1.System_File.Descriptor) 
        and (Dir.Comp.Mode = Write_Only) and (Dir.Comp.Name = String2))
      then
         return True;
      else
         return False;
      end if;
   end Validate_Dir;

end C730004_0.C730004_2;

     --=================================================================--

with C730004_0.C730004_2; 
with Report;

procedure C730004 is

   package File      renames C730004_0;
   package File_Ops  renames C730004_0.C730004_2;            

   Validation_File : File.File_Type;     

   Validation_Dir  : File_Ops.File_Dir;

   ------------------------------------------------------------------------ 
   -- Limited File_Type is allowed as an out parameter outside package File.

   procedure Call_Modify_File (Modified_File : out File.File_Type) is
   begin
      File_Ops.Modify_File (Modified_File);
   end Call_Modify_File;     
  
begin

   Report.Test ("C730004", "Check that for a type declared in a package, "   &
                           "descendants of the package use the full view "   &
                           "of the type.  Specifically check that full "     &
                           "view of the limited type is visible only in "    &
                           "private children and in the private parts and "  &
                           "bodies of public children");

   File_Ops.Create_File (Validation_File);

   if not File_Ops.Validate_Create (Validation_File) then
      Report.Failed ("Incorrect creation of file");
   end if;

   Call_Modify_File (Validation_File);

   if not File_Ops.Validate_Modification (Validation_File) then 
      Report.Failed ("Incorrect modification of file");
   end if;

   if not File_Ops.Validate_Dir (Validation_Dir) then
      Report.Failed ("Incorrect creation of directory");
   end if;

   Report.Result;

end C730004;