Package: Util.Environment.Windows

Description

Copyright © 2001, 2002 by Thomas Wolf.
This piece of software 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. This software 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 with this distribution, 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 from the GPL, 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 GPL. This exception does not however invalidate any other reasons why the executable file might be covered by the GPL.

Version: 1.1

Author:
Thomas Wolf (TW) <twolf AT acm DOT org>
Purpose:
Windows-style environment variable substitution.
Tasking Semantics
Neither task- nor abortion-safe.
Storage Semantics
No dynamic storage allocation.

Header

package Util.Environment.Windows is

 
pragma Elaborate_Body;

Type Summary

Windows_Expander derived from String_Expander
Overridden Operations:  Expand
Inherited Operations:  Get

Other Items:

type Windows_Expander is new String_Expander with private;
function Expand
  (Self   : access Windows_Expander;
   Source : in     String)
  return String;
Replaces all references to environment variables in Source by that variable's definition (or the empty string, if an environment variable is not defined) and returns the resulting string.

A reference has the format "%Var_Name%". To include a literal '%' sign, either make sure it is followed by whitespace, there is no second '%' in the Source string, or double it. 

private

   --  Implementation-defined ...

end Util.Environment.Windows;
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