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-- CXAA014.A

--

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--*

--

-- OBJECTIVE:

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

--      to check for the end of a line or page using the predefined functions

--      End_Of_Line or End_Of_Page 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 CXAA014 is

   use Ada;

   Text_File     : Text_IO.File_Type;

   Text_Filename : constant String :=

                              Report.Legal_File_Name ( Nam => "CXAA014" );

   Incomplete : exception;

begin

         Report.Test ("CXAA014", "Check that the exception Mode_Error is "  &

                                 "raised when an attempt is made to check " &

                                 "for the end of a line or page using the " &

                                 "predefined functions End_Of_Line or "     &

                                 "End_Of_Page on a text file with mode "    &

                                 "Append_File");

         Test_for_Text_IO_Support:

         begin

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

-- supported.

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

   exception

       when Text_IO.Use_Error | Text_IO.Name_Error =>

          Report.Not_Applicable

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

          raise Incomplete;

   end Test_for_Text_IO_Support;

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

            for I in 1 .. 10 loop

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

            end loop;

            Text_IO.Close (Text_File);

            Operational_Test_Block:

            declare

               TC_Number_Of_Forced_Mode_Errors : constant Natural := 2;

               TC_Mode_Errors : Natural := 0;

            begin

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

               Test_for_End_Of_Line:

               declare

                  TC_End_Of_Line : Boolean;

               begin

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

-- invoke the End_Of_Line function 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.

                  TC_End_Of_Line := Text_IO.End_Of_Line (Text_File);

                  Report.Failed ("Exception not raised by End_Of_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 End_Of_Line processing");

               end Test_for_End_Of_Line;

               Test_for_End_Of_Page:

               declare

                  TC_End_Of_Page : Boolean;

               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

-- End_Of_Page function for the file (that is currently in Append_File mode).

                  TC_End_Of_Page := Text_IO.End_Of_Page (Text_File);

                  Report.Failed ("Exception not raised by End_Of_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 End_Of_Page processing");

               end Test_for_End_Of_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 CXAA014;