File : aws-headers-values.ads


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

--                              Ada Web Server                              --

--                                                                          --

--                         Copyright (C) 2002-2003                          --

--                                ACT-Europe                                --

--                                                                          --

--  Authors: Dmitriy Anisimkov - Pascal Obry                                --

--                                                                          --

--  This library is free software; you can redistribute it and/or modify    --

--  it under the terms of the GNU General Public License as published by    --

--  the Free Software Foundation; either version 2 of the License, or (at   --

--  your option) any later version.                                         --

--                                                                          --

--  This library is distributed in the hope that it will be useful, but     --

--  WITHOUT 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       --

--  along with this library; if not, write to the Free Software Foundation, --

--  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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.                                     --

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


--  $Id: aws-headers-values.ads,v 1.1 2003/10/05 19:59:54 Jano Exp $


with Ada.Strings.Unbounded;

package AWS.Headers.Values is

   use Ada.Strings.Unbounded;

   --  Data represent a token from an header line. There is two kinds of

   --  token, either named or un-named.

   --

   --     Content-Type: xyz boundary="uvt"

   --

   --  Here xyz is an un-named value and uvt a named value the name is

   --  boundary.


   type Data (Named_Value : Boolean := True) is record
      Value : Unbounded_String;
      case Named_Value is
         when True =>
            Name : Unbounded_String;
         when False =>
            null;
      end case;
   end record;

   type Set is array (Positive range <>) of Data;

   -----------

   -- Parse --

   -----------


   generic

      with procedure Value
        (Item : in     String;
         Quit : in out Boolean);
      --  Called for every un-named value read from the header value


      with procedure Named_Value
        (Name  : in     String;
         Value : in     String;
         Quit  : in out Boolean);
      --  Called for every named value read from the header value


   procedure Parse (Header_Value : in String);
   --  Look for un-named values and named ones (Name="Value" pairs) in the

   --  header line, and call appropriate routines when found. Quit is set to

   --  False before calling Value or Named_Value, the parsing can be stopped

   --  by setting Quit to True.


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

   -- Split / Index --

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


   function Split (Header_Value : in String) return Set;
   --  Returns a Set with each named and un-named values splited from Data.


   function Index
     (Set            : in Values.Set;
      Name           : in String;
      Case_Sensitive : in Boolean := True)
      return Natural;
   --  Returns index for Name in the set or 0 if Name not found.

   --  If Case_Sensitive is false the find is case_insensitive.


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

   -- Other search routines --

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


   function Search
     (Header_Value   : in String;
      Name           : in String;
      Case_Sensitive : in Boolean := True)
      return String;
   --  Returns Value for Name in Header_Value or the empty string if Name not

   --  found. If Case_Sensitive is False the search is case insensitive.


   function Get_Unnamed_Value
     (Header_Value : in String;
      N            : in Positive := 1)
      return String;
   --  Returns N-th un-named value from Header_Value.


   function Unnamed_Value_Exists
     (Header_Value   : in String;
      Value          : in String;
      Case_Sensitive : in Boolean := True)
      return Boolean;
   --  Returns True if the unnamed value specified has been found in

   --  Header_Value.


end AWS.Headers.Values;