First import from sources

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+--  VHDL parser.
+--  Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold
+--
+--  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.
+with Iirs; use Iirs;
+
+package Parse is
+   -- Parse a single design unit.
+   -- The scanner must have been initialized, however, the current_token
+   -- shouldn't have been set.
+   -- At return, the last token accepted is the semi_colon that terminates
+   -- the library unit.
+   -- Return Null_Iir when end of file.
+   function Parse_Design_Unit return Iir_Design_Unit;
+
+   --  Parse a file.
+   --  The scanner must habe been initialized as for parse_design_unit.
+   --  Return Null_Iir in case of error.
+   function Parse_Design_File return Iir_Design_File;
+end Parse;