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-------------------------------------------------------------------------------
--
-- Copyright (C) 2012 - 2014 Stephe Leake
-- Copyright (C) 1999 Ted Dennison
--
-- This file is part of the OpenToken package.
--
-- The OpenToken package 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 3, or (at your option)
-- any later version. The OpenToken package 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  distributed with the OpenToken
-- package;  see file GPL.txt.  If not, write to  the Free Software Foundation,
-- 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.
--
-------------------------------------------------------------------------------

-----------------------------------------------------------------------------
--  This package provides a type and operations for building lists of
--  tokens for use in grammar productions
-----------------------------------------------------------------------------
generic

package OpenToken.Token.Enumerated.List is

   type Instance is tagged private;

   Null_List : constant Instance;

   function Length (Item : in Instance) return Natural;

   ----------------------------------------------------------------------------
   --  Create a token list from a single instance.
   ----------------------------------------------------------------------------
   function Only (Subject : in Class) return Instance;
   function Only (Subject : in Handle) return Instance;

   ----------------------------------------------------------------------------
   --  Create a token list from a pair of token instances.
   ----------------------------------------------------------------------------
   function "&" (Left  : in Class;
                 Right : in Class) return Instance;

   ----------------------------------------------------------------------------
   --  Create a token list from a token instance and a token list.
   ----------------------------------------------------------------------------
   function "&" (Left  : in Class;
                 Right : in Instance) return Instance;
   function "&" (Left  : in Instance;
                 Right : in Class) return Instance;

   ----------------------------------------------------------------------------
   --  Create a token list from a pair of token lists.
   ----------------------------------------------------------------------------
   function "&" (Left  : in Instance;
                 Right : in Instance) return Instance;

   function "&"
     (Left  : in Handle;
      Right : in Handle)
     return Instance;

   function "&"
     (Left  : in Instance;
      Right : in Handle)
     return Instance;

   --------------------------------------------------------------------------
   --  This routine needs to be called when you are done using a list,
   --  or want to reset it to empty.
   --------------------------------------------------------------------------
   procedure Clean (List : in out Instance);

   type List_Iterator is private;
   Null_Iterator : constant List_Iterator;

   ----------------------------------------------------------------------------
   --  Return an initialized iterator for traversing the token list
   ----------------------------------------------------------------------------
   function Initial_Iterator (List : in Instance) return List_Iterator;

   ----------------------------------------------------------------------------
   --  Move the iterator down the list to the next token, or to
   --  Null_Iterator if there is no next token.
   ----------------------------------------------------------------------------
   procedure Next_Token (Iterator : in out List_Iterator);
   procedure Next (Iterator : in out List_Iterator) renames Next_Token;

   function Next_Token (Iterator : in List_Iterator) return List_Iterator;
   function Next (Iterator : in List_Iterator) return List_Iterator renames Next_Token;

   function Token_Handle (Iterator : in List_Iterator) return Handle;
   function ID (Iterator : in List_Iterator) return Token_ID;

   ---------------------
   -- Parser Routines --

   --  Enqueue Token on List, at the head. Token itself is not
   --  copied; it will be freed by Clean.
   procedure Enqueue
     (List  : in out Instance;
      Token : in     Handle);

   --  Append to tail of List, without copying Token
   procedure Append
     (List  : in out Instance;
      Token : in     Handle);

   procedure Print (Item : in Instance);
   --  Print Item to Ada.Text_IO.Current_Output.

private
   type List_Node;
   type List_Node_Ptr is access List_Node;
   type List_Node is record
      Token : Handle;
      Next  : List_Node_Ptr;
   end record;

   type Instance is tagged record
      Head : List_Node_Ptr;
      Tail : List_Node_Ptr;
   end record;

   type List_Iterator is new List_Node_Ptr;
   Null_Iterator : constant List_Iterator := null;

   Null_List : constant Instance := (null, null);

end OpenToken.Token.Enumerated.List;