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-- CXAA013.A

--

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--*

--

-- OBJECTIVE:

--      Check that the exception Mode_Error is raised when an attempt is made

--      to skip a line or page using the predefined Skip_Line and Skip_Page

--      procedures on a text file with mode Append_File.

--

-- TEST DESCRIPTION:

--      A scenario is created that demonstrates the potential for the

--      incorrect usage of predefined text processing subprograms, which

--      results in the raising of a Mode_Error exception.

--      A count is kept to ensure that each anticipated exception is in fact

--      raised and handled properly.

--

-- APPLICABILITY CRITERIA:

--      This test is applicable only to implementations that support text

--      files.

--

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--      28 Feb 97   PWB.CTA Allowed for non-support of some IO operations

--!

with Ada.Text_IO;

with Report;

procedure CXAA013 is

   use Ada;

   Text_File     : Text_IO.File_Type;

   Text_Filename : constant String :=

                              Report.Legal_File_Name ( Nam => "CXAA013" );

   Incomplete : exception;

begin

         Report.Test ("CXAA013", "Check that the exception Mode_Error is " &

                                 "raised when an attempt is made to skip " &

                                 "a line or page using the predefined "    &

                                 "Skip_Line and Skip_Page procedures on "  &

                                 "a text file with mode Append_File");

         Test_for_Text_IO_Support:

         begin

-- An application creates a text file with mode Append_File.

-- Use_Error will be raised if Text_IO operations or external files are not

-- supported.

            Text_IO.Create (Text_File, Text_IO.Append_File, Text_Filename);

   exception

       when Text_IO.Use_Error | Text_IO.Name_Error =>

          Report.Not_Applicable

             ( "Files not supported - Create as Append_File for Text_IO" );

          raise Incomplete;

   end Test_for_Text_IO_Support;

-- The application writes some amount of data to the file.

   Text_IO.Put_Line (Text_File, "Data entered into the file");

   Operational_Test_Block:

   declare

      TC_Number_Of_Forced_Mode_Errors : constant Natural := 2;

      TC_Mode_Errors : Natural := 0;

   begin

      Test_for_Skip_Line:

      declare

         TC_Spacing : constant Text_IO.Count := 3;

      begin

-- During the course of its processing, the application may attempt to

-- invoke the Skip_Line procedure on a file that is currently in Append_File

-- mode (instead of the anticipated In_File mode).  This results in the

-- raising of Mode_Error.

         Text_IO.Skip_Line (Text_File, TC_Spacing);

         Report.Failed ("Exception not raised by Skip_Line");

-- An exception handler present within the application handles the exception

-- and processing can continue.

      exception

         when Text_IO.Mode_Error =>

            TC_Mode_Errors := TC_Mode_Errors + 1;

         when others =>

            Report.Failed("Exception in Skip_Line processing");

      end Test_for_Skip_Line;

      Test_for_Skip_Page:

      begin

-- Again, during the course of its processing, the application incorrectly

-- assumes that the file mode is In_File, this time attempting to call the

-- Skip_Page procedure for the file (that is currently in Append_File mode).

         Text_IO.Skip_Page (Text_File);

         Report.Failed ("Exception not raised by Skip_Page");

-- Once again, an exception handler present within the application handles

-- the exception and processing continues.

      exception

         when Text_IO.Mode_Error =>

            TC_Mode_Errors := TC_Mode_Errors + 1;

         when others =>

            Report.Failed("Exception in Skip_Page processing");

      end Test_for_Skip_Page;

      if (TC_Mode_Errors /= TC_Number_Of_Forced_Mode_Errors) then

         Report.Failed ("Incorrect number of exceptions handled");

      end if;

   end Operational_Test_Block;

   Deletion:

   begin

      -- Delete the external file.

      if Text_IO.Is_Open (Text_File) then

         Text_IO.Delete (Text_File);

      else

         Text_IO.Open (Text_File, Text_IO.In_File, Text_Filename);

         Text_IO.Delete (Text_File);

      end if;

   exception

      when others =>

         Report.Failed

            ( "Delete not properly implemented for Text_IO" );

   end Deletion;

   Report.Result;

exception

   when Incomplete =>

      Report.Result;

   when others     =>

      Report.Failed ( "Unexpected exception" );

      Report.Result;

end CXAA013;