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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                        G N A T . C G I . D E B U G                       --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--                     Copyright (C) 2000-2008, AdaCore                     --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 2,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNAT;  see file COPYING.  If not, write --

-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --

-- Boston, MA 02110-1301, USA.                                              --

--                                                                          --

-- As a special exception,  if other files  instantiate  generics from this --

-- unit, or you link  this unit with other files  to produce an executable, --

-- this  unit  does not  by itself cause  the resulting  executable  to  be --

-- covered  by the  GNU  General  Public  License.  This exception does not --

-- however invalidate  any other reasons why  the executable file  might be --

-- covered by the  GNU Public License.                                      --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

with Ada.Strings.Unbounded;

package body GNAT.CGI.Debug is

   use Ada.Strings.Unbounded;

   --  Define the abstract type which act as a template for all debug IO modes.

   --  To create a new IO mode you must:

   --     1. create a new package spec

   --     2. create a new type derived from IO.Format

   --     3. implement all the abstract routines in IO

   package IO is

      type Format is abstract tagged null record;

      function Output (Mode : Format'Class) return String;

      function Variable

        (Mode  : Format;

         Name  : String;

         Value : String) return String is abstract;

      --  Returns variable Name and its associated value

      function New_Line (Mode : Format) return String is abstract;

      --  Returns a new line such as this concatenated between two strings

      --  will display the strings on two lines.

      function Title (Mode : Format; Str : String) return String is abstract;

      --  Returns Str as a Title. A title must be alone and centered on a

      --  line. Next output will be on the following line.

      function Header

        (Mode : Format;

         Str  : String) return String is abstract;

      --  Returns Str as an Header. An header must be alone on its line. Next

      --  output will be on the following line.

   end IO;

   ----------------------

   -- IO for HTML Mode --

   ----------------------

   package HTML_IO is

      --  See IO for comments about these routines

      type Format is new IO.Format with null record;

      function Variable

        (IO    : Format;

         Name  : String;

         Value : String) return String;

      function New_Line (IO : Format) return String;

      function Title (IO : Format; Str : String) return String;

      function Header (IO : Format; Str : String) return String;

   end HTML_IO;

   ----------------------------

   -- IO for Plain Text Mode --

   ----------------------------

   package Text_IO is

      --  See IO for comments about these routines

      type Format is new IO.Format with null record;

      function Variable

        (IO    : Format;

         Name  : String;

         Value : String) return String;

      function New_Line (IO : Format) return String;

      function Title (IO : Format; Str : String) return String;

      function Header (IO : Format; Str : String) return String;

   end Text_IO;

   --------------

   -- Debug_IO --

   --------------

   package body IO is

      ------------

      -- Output --

      ------------

      function Output (Mode : Format'Class) return String is

         Result : Unbounded_String;

      begin

         Result :=

           To_Unbounded_String

             (Title (Mode, "CGI complete runtime environment")

              & Header (Mode, "CGI parameters:")

              & New_Line (Mode));

         for K in 1 .. Argument_Count loop

            Result := Result

              & Variable (Mode, Key (K), Value (K))

              & New_Line (Mode);

         end loop;

         Result := Result

           & New_Line (Mode)

           & Header (Mode, "CGI environment variables (Metavariables):")

           & New_Line (Mode);

         for P in Metavariable_Name'Range loop

            if Metavariable_Exists (P) then

               Result := Result

                 & Variable (Mode,

                             Metavariable_Name'Image (P),

                             Metavariable (P))

                 & New_Line (Mode);

            end if;

         end loop;

         return To_String (Result);

      end Output;

   end IO;

   -------------

   -- HTML_IO --

   -------------

   package body HTML_IO is

      NL : constant String := (1 => ASCII.LF);

      function Bold (S : String) return String;

      --  Returns S as an HTML bold string

      function Italic (S : String) return String;

      --  Returns S as an HTML italic string

      ----------

      -- Bold --

      ----------

      function Bold (S : String) return String is

      begin

         return "<b>" & S & "</b>";

      end Bold;

      ------------

      -- Header --

      ------------

      function Header (IO : Format; Str : String) return String is

         pragma Unreferenced (IO);

      begin

         return "<h2>" & Str & "</h2>" & NL;

      end Header;

      ------------

      -- Italic --

      ------------

      function Italic (S : String) return String is

      begin

         return "<i>" & S & "</i>";

      end Italic;

      --------------

      -- New_Line --

      --------------

      function New_Line (IO : Format) return String is

         pragma Unreferenced (IO);

      begin

         return "<br>" & NL;

      end New_Line;

      -----------

      -- Title --

      -----------

      function Title (IO : Format; Str : String) return String is

         pragma Unreferenced (IO);

      begin

         return "<p align=center><font size=+2>" & Str & "</font></p>" & NL;

      end Title;

      --------------

      -- Variable --

      --------------

      function Variable

        (IO    : Format;

         Name  : String;

         Value : String) return String

      is

         pragma Unreferenced (IO);

      begin

         return Bold (Name) & " = " & Italic (Value);

      end Variable;

   end HTML_IO;

   -------------

   -- Text_IO --

   -------------

   package body Text_IO is

      ------------

      -- Header --

      ------------

      function Header (IO : Format; Str : String) return String is

      begin

         return "*** " & Str & New_Line (IO);

      end Header;

      --------------

      -- New_Line --

      --------------

      function New_Line (IO : Format) return String is

         pragma Unreferenced (IO);

      begin

         return String'(1 => ASCII.LF);

      end New_Line;

      -----------

      -- Title --

      -----------

      function Title (IO : Format; Str : String) return String is

         Spaces : constant Natural := (80 - Str'Length) / 2;

         Indent : constant String (1 .. Spaces) := (others => ' ');

      begin

         return Indent & Str & New_Line (IO);

      end Title;

      --------------

      -- Variable --

      --------------

      function Variable

        (IO    : Format;

         Name  : String;

         Value : String) return String

      is

         pragma Unreferenced (IO);

      begin

         return "   " & Name & " = " & Value;

      end Variable;

   end Text_IO;

   -----------------

   -- HTML_Output --

   -----------------

   function HTML_Output return String is

      HTML : HTML_IO.Format;

   begin

      return IO.Output (Mode => HTML);

   end HTML_Output;

   -----------------

   -- Text_Output --

   -----------------

   function Text_Output return String is

      Text : Text_IO.Format;

   begin

      return IO.Output (Mode => Text);

   end Text_Output;

end GNAT.CGI.Debug;