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-- CXAA003.A
--
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--     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 the procedures New_Page, Set_Line, Set_Col, and New_Line
--      subprograms perform properly on a text file reset (from Out_File) 
--      with mode Append_File.
--      Check that the attributes Page, Line, and Column are all set to 1
--      following the reset of a text file with mode Append_File.
--      Check that the functions Page, Line, and Col perform properly on a
--      text file reset with mode Append_File.
--      Check that the procedures Put and Put_Line perform properly on text
--      files reset with mode Append_File.
--      Check that the procedure Set_Line sets the current line number to
--      the value specified by the parameter "To" for text files reset with
--      mode Append_File.  Check that Set_Line has no effect if the specified
--      line equals the current line.
--      Check that the procedure Set_Col sets the current column number to
--      the value specified by the parameter "To" for text files reset with
--      mode Append_File.
--
-- TEST DESCRIPTION:
--      This test is designed to simulate the text processing that could
--      occur with files that have been created in Out_File mode,
--      and then reset to Append_File mode. 
--      Various calls to Text_IO formatting subprograms are called to properly
--      position text appended to a document.  The text content and position
--      are subsequently verified for accuracy.
--
-- APPLICABILITY CRITERIA: 
--      This test is applicable only to implementations that support text
--      files.
--
--       
-- CHANGE HISTORY:
--      06 Dec 94   SAIC    ACVC 2.0
--      24 Feb 97   PWB.CTA Allowed for non-support of some IO operations.
--!

with Ada.Text_IO;
with Report;

procedure CXAA003 is
   use Ada;  
   Data_File        : Text_IO.File_Type;
   Data_Filename    : constant String :=
                      Report.Legal_File_Name ( Nam => "CXAA003" );
   Incomplete       : exception;

begin

   Report.Test ("CXAA003", "Check that page, line, and column formatting " &
                           "subprograms perform properly on text files "   &
                           "reset with mode Append_File");

   Test_for_Text_IO_Support:
   begin

      -- An implementation that does not support Text_IO in a particular
      -- environment will raise Use_Error on calls to various
      -- Text_IO operations.  This block statement encloses a call to
      -- Create, which should raise the exception in a non-supportive 
      -- environment.  This exception will be handled to produce a
      -- Not_Applicable result.

      Text_IO.Create (File => Data_File,
                      Mode => Text_IO.Out_File,
                      Name => Data_Filename);
   exception
      when Text_IO.Use_Error | Text_IO.Name_Error =>
        Report.Not_Applicable
          ( "Text files not supported - Create as Out_File" );
        raise Incomplete;
   end Test_for_Text_IO_Support;

   Operational_Test_Block:
   declare

      Default_Position : constant Text_IO.Positive_Count := 1;

      Section_Header   : constant String := "IX.  ";
      Glossary_Title   : constant String := "GLOSSARY";
      Glossary_Content : constant String := "TBD";

      -- The following procedure simulates the addition of a Glossary page
      -- to an existing text file that has been reset with mode 
      -- Append_File.

      procedure Position_Glossary_Text 
        (The_File : in out Text_IO.File_Type) is
         use Text_IO;   -- To provide visibility to the "/=" operator.
      begin

         -- Test control code.
         -- Verify initial page value.
         if (Text_IO.Page (The_File) /= Default_Position) then
            Report.Failed ("Incorrect default page number");  
         end if;
         -- Verify initial line number.
         if (Text_IO.Line (The_File) /= Default_Position) then
            Report.Failed ("Incorrect default line number");  
         end if;   
         -- Verify initial column number.
         if (Text_IO.Col (The_File) /= Default_Position) then 
            Report.Failed ("Incorrect default column number");
         end if;   
         -- Simulated usage code.  Set new page/line positions.
         Text_IO.New_Page (The_File);                           
         Text_IO.New_Page (The_File);                       
         Text_IO.New_Line (File => The_File, Spacing => 1); 

         -- Test control code.
         if (Integer(Text_IO.Page(The_File))  /= 
             Report.Ident_Int(3))                or else
            (Integer(Text_IO.Line (The_File)) /= 
             Report.Ident_Int(2)) then 
            Report.Failed ("Incorrect results from page/line positioning");
         end if;

         -- Simulated usage code.  Position title of Glossary.
         Text_IO.Put      (The_File, Section_Header);        
         Text_IO.Put_Line (The_File, Glossary_Title);        
         -- Set line to the current line.
         Text_IO.Set_Line (File => The_File, To => 3);       

         -- Test control code.
         if (Integer(Text_IO.Page (The_File)) /= Report.Ident_Int(3)) or
            (Integer(Text_IO.Line (The_File)) /= Report.Ident_Int(3)) or
            (Integer(Text_IO.Col (The_File))  /= Report.Ident_Int(1)) then
            Report.Failed ("Set_Line failed for current line");
         end if;

         -- Simulated usage code.
         Text_IO.Set_Line (File => The_File, To => 4);        -- Set new 
         Text_IO.Set_Col  (File => The_File, To => 10);       -- position.

         -- Test control code.
         if (Integer(Text_IO.Line (The_File)) /= Report.Ident_Int(4))  or
            (Integer(Text_IO.Col  (The_File)) /= Report.Ident_Int(10)) then
            Report.Failed 
              ("Incorrect results from line/column positioning");
         end if;

         -- Simulated usage code.                          -- Position 
         Text_IO.Put_Line (The_File, Glossary_Content);    -- content of 
                                                           -- Glossary.
      end Position_Glossary_Text;


   begin

      -- In the scenario, data is added to the file here.
      Text_IO.Put_Line (File => Data_File, Item => "Some optional data");

      -- This code section simulates a scenario that could occur in a 
      -- text processing environment.  Text is to be appended to an 
      -- existing document: 
      --   The file is reset to append mode.
      --   A procedure is called to perform the positioning and placement
      --   of text.
      --   The position on the appended page is set, verified, and text is
      --   placed in the file.  
      -- 
      -- Note: The text file has been originally created in Out_File
      -- mode, and has subsequently been reset to Append_File mode.

      Reset1:
      begin
         -- Reset has effect of calling New_Page.
         Text_IO.Reset  (Data_File, Text_IO.Append_File);
      exception
         when Text_IO.Use_Error =>
            Report.Not_Applicable
               ( "Reset to Append_File not supported for Text_IO" );
            raise Incomplete;
      end Reset1;

      Position_Glossary_Text (The_File => Data_File);

      Test_Verification_Block:
      declare
         TC_Page, TC_Line, TC_Column  : Text_IO.Positive_Count;
         TC_Position                  : Natural := 0;
         Blanks                       : constant String  :=
           "               ";
         TC_String                    : String (1 .. 15) := Blanks;
      begin                                          
         Reset2:
         begin
            Text_IO.Reset     (Data_File, Text_IO.In_File);
         exception
           when Text_IO.Use_Error =>
             Report.Not_Applicable
               ( "Reset to In_File not supported for Text_IO" );
             raise Incomplete;
         end Reset2;

         Text_IO.Skip_Page (Data_File);
         Text_IO.Skip_Page (Data_File);

         -- If the Reset to Append_File mode actually put a page terminator
         -- on the file, as allowed (but not required) by RM A.10.2(4), then
         -- we are now on page 3, an empty page.  We'll need to skip one more.

         if Text_IO.End_Of_Page (Data_File) then
            Text_IO.Skip_Page (Data_File);
         end if;

         -- Now we're on the Glossary page.

                                                -- Loop to the second line
         for I in 1 .. 2 loop                   -- and read the contents.
            Text_IO.Get_Line (Data_File, TC_String, TC_Position); 
         end loop;
            if (TC_Position /= 13) or else         -- Verify the title line.
               (TC_String (1..2)  /= "IX") or else             
               (TC_String (3..13) /= (".  " & Glossary_Title)) then
               Report.Failed ("Incorrect positioning of title line");
            end if;

            TC_String := Blanks;                   -- Clear string.
                                                   -- Loop to the fourth line
            for I in 3 .. 4 loop                   -- and read the contents.
               Text_IO.Get_Line (Data_File, TC_String, TC_Position); 
            end loop;

            if (TC_Position /= 12) or              -- Verify the contents.
               (TC_String (8..12) /= "  " & Glossary_Content) then     
               Report.Failed ("Incorrect positioning of contents line");
            end if;

         exception
            when Incomplete =>
               raise;
            when others => 
               Report.Failed ("Error raised during data verification");

         end Test_Verification_Block;

      exception
         when Incomplete =>
            raise;
         when others => 
            Report.Failed ("Exception raised during Text_IO processing");

      end Operational_Test_Block;

      Final_Block:
      begin
         -- Delete the external file.
         if Text_IO.Is_Open (Data_File) then
            Text_IO.Delete (Data_File);        
         else
            Text_IO.Open (Data_File, Text_IO.In_File, Data_Filename);
            Text_IO.Delete (Data_File);        
         end if;
      exception
         when others =>
            Report.Failed ( "Delete not properly implemented for Text_IO" );
      end Final_Block;

   Report.Result;

   exception
     when Incomplete =>
       Report.Result;
     when others     =>
       Report.Failed ( "Unexpected exception" );
       Report.Result;

end CXAA003;