# Copyright (c) 2002-2008 bivio Software, Inc.  All Rights Reserved.
#
# Visit http://www.bivio.biz for more info.
# 
# This library is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation; either version 2.1 of the
# License, or (at your option) any later version.
# 
# This library 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
# Lesser General Public License for more details.
# 
# You should have received a copy of the GNU Lesser General Public
# License along with this library;  If not, you may get a copy from:
# http://www.opensource.org/licenses/lgpl-license.html
# 
# $Id: DomainName.pm,v 2.5 2008/05/31 21:58:18 nagler Exp $
package Bivio::Type::DomainName;
use strict;
use Bivio::Base 'Type.SyntacticString';
use Socket ();

our($VERSION) = sprintf('%d.%02d', q$Revision: 2.5 $ =~ /\d+/g);

sub REGEX {
    return qr/((?:[-a-z0-9]{1,63})(?:\.[-a-z0-9]{1,63})+)/is;
}

sub SYNTAX_ERROR {
    return Bivio::TypeError->DOMAIN_NAME;
}

sub get_width {
    return 255;
}

sub internal_post_from_literal {
    return lc($_[1]);
}

sub unsafe_to_dotted_decimal {
    my($proto, $value) = @_;
    return Socket::inet_ntoa(
	gethostbyname($proto->from_literal_or_die($value))
	|| return undef,
    );
}

1;