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+--  GHDL Run Time (GRT) - Wave option file package for parsing.
+--  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 for file manipulation and
+--              tree creation.
+--              When State = Display_Tree, it parse the wave option file
+--              provided in the command line and create a tree with the path of
+--              the signals to be displayed on the waveform.
+
+with Grt.Stdio; use Grt.Stdio;
+
+package Grt.Wave_Opt.File is
+   pragma Preelaborate;
+
+   -- Open the wave option file given as parameter and parses it if it exists,
+   -- otherwise creates it and it will be written when reading the design
+   -- hierarchy
+   procedure Start (Option_File : String; To_Be_Created : Boolean);
+
+   -- Write the path of a signal to the option file
+   procedure Write_Signal_Path (Signal : Elem_Acc);
+
+   -- Write a starting comment before the first signal path of the packages
+   -- tree or of the entities tree is ever written
+   procedure Write_Tree_Comment (Tree_Index : Tree_Index_Type);
+
+   -- Update_Tree : Update the tree with the current VHDL element read from
+   -- the current path.
+   -- Called when the option file is read or when the option file is created
+   -- while reading the design hierarchy.
+   procedure Update_Tree (Cursor : in out Elem_Acc;
+                          Updated : out Boolean;
+                          Elem_Name : String;
+                          Level : Natural;
+                          Path_Context : Path_Context_Acc := null);
+
+   -- Destructor
+   procedure Finalize;
+
+private
+
+   Write_Stream : FILEs;
+
+   Buf_Size : constant := 1024;
+
+   type Version_Type is record
+      Major : Integer;
+      Minor : Integer;
+   end record;
+   Version : Version_Type := (others => -1);
+   Current_Version : constant Version_Type := (Major => 1, Minor => 0);
+
+   type Sep_Array is array (Tree_Index_Type) of Character;
+
+end Grt.Wave_Opt.File;