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+--  VHDL lexical scanner.
+--  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 Types; use Types;
+with Tokens; use Tokens;
+
+package Scan is
+   -- Global variables
+   -- The token that was just scanned.
+   -- When the token was eaten, you can call invalidate_current_token to
+   -- set it to tok_invalid.
+   -- Current_token should not be written outside of scan package.
+   -- It can be replaced by a function call.
+   Current_Token: Token_Type := Tok_Invalid;
+
+   -- Simply set current_token to tok_invalid.
+   procedure Invalidate_Current_Token;
+   pragma Inline (Invalidate_Current_Token);
+
+   -- When CURRENT_TOKEN is an tok_identifier, tok_char or tok_string,
+   -- its name_id can be got via this function.
+   function Current_Identifier return Name_Id;
+   pragma Inline (Current_Identifier);
+
+   -- Get current string identifier and length.
+   function Current_String_Id return String_Id;
+   function Current_String_Length return Nat32;
+   pragma Inline (Current_String_Id);
+   pragma Inline (Current_String_Length);
+
+   -- Set Current_identifier to null_identifier.
+   -- Can be used to catch bugs.
+   procedure Invalidate_Current_Identifier;
+   pragma Inline (Invalidate_Current_Identifier);
+
+   -- When CURRENT_TOKEN is tok_integer, returns the value.
+   -- When CURRENT_TOKEN is tok_bit_string, returns the base.
+   function Current_Iir_Int64 return Iir_Int64;
+   pragma Inline (Current_Iir_Int64);
+
+   -- When CURRENT_TOKEN is tok_real, it returns the value.
+   function Current_Iir_Fp64 return Iir_Fp64;
+   pragma Inline (Current_Iir_Fp64);
+
+   -- Advances the lexical analyser.  Put a new token into current_token.
+   procedure Scan;
+
+   -- Initialize the scanner with file SOURCE_FILE.
+   procedure Set_File (Source_File : Source_File_Entry);
+
+   procedure Set_Current_Position (Position: Source_Ptr);
+
+   -- Finalize the scanner.
+   procedure Close_File;
+
+   --  If true, comments are reported as a token.
+   Flag_Comment : Boolean := False;
+
+   --  If true, newlines are reported as a token.
+   Flag_Newline : Boolean := False;
+
+   -- Get the current location, or the location of the current token.
+   -- Since a token cannot spread over lines, file and line of the current
+   -- token are the same as those of the current position.
+   function Get_Current_File return Name_Id;
+   function Get_Current_Source_File return Source_File_Entry;
+   function Get_Current_Line return Natural;
+   function Get_Current_Column return Natural;
+   function Get_Token_Location return Location_Type;
+   function Get_Token_Column return Natural;
+   function Get_Token_Position return Source_Ptr;
+   function Get_Position return Source_Ptr;
+
+   --  Convert (canonicalize) an identifier stored in name_buffer/name_length.
+   --  Upper case letters are converted into lower case.
+   --  Lexical checks are performed.
+   --  This procedure is not used by Scan, but should be used for identifiers
+   --  given in the command line.
+   --  Errors are directly reported through error_msg_option.
+   --  Also, Vhdl_Std should be set.
+   procedure Convert_Identifier;
+
+end Scan;