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+--  GHDL Run Time (GRT) - Wave option file package for reading the tree.
+--  Copyright (C) 2016 Jonas Baggett
+--
+--  GHDL 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, or (at your option) any later
+--  version.
+--
+--  GHDL 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 GCC; see the file COPYING.  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.
+
+-- Description: Wave option file child package doing the link between the
+--              design and the other wave option packages.
+--              Provides functions to find in the tree which signals are to be
+--              displayed or not.
+--              When State = Display_Tree, it reads the tree created after
+--              parsing the wave option file and filters signals accordingly.
+--              When State = Write_File, it calls File.Update_Tree to create
+--              the tree from the design tree and write the signal paths of all
+--              the design to a new wave option file.
+
+with Grt.Types; use Grt.Types;
+
+package Grt.Wave_Opt.Design is
+   pragma Preelaborate;
+
+   -- Returns the top element of the tree corresponding to the index given, but
+   -- only if the name given matches with it.  Otherwise returns null
+   function Get_Top_Cursor (Tree_Index : Tree_Index_Type; Name : Ghdl_C_String)
+                           return Elem_Acc;
+
+   -- If there is an element in the parent element given that matches the name
+   -- given, returns it, otherwise returns null
+   function Get_Cursor
+     (Parent : Elem_Acc; Name : Ghdl_C_String; Is_Signal : Boolean := False)
+     return Elem_Acc;
+
+   -- Returns true if the element given is not null, which means it exists in
+   -- the tree of the VHDL elements to be displayed
+   function Is_Displayed (Cursor : Elem_Acc) return Boolean;
+
+   -- If relevent, read the whole tree and check if every element was found in
+   -- design
+   procedure Last_Checks;
+
+end Grt.Wave_Opt.Design;