# Copyright (c) 2006-2008 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: MailSubject.pm,v 1.3 2008/02/11 04:48:41 nagler Exp $
package Bivio::Type::MailSubject;
use strict;
use base 'Bivio::Type::Line';

our($VERSION) = sprintf('%d.%02d', q$Revision: 1.3 $ =~ /\d+/g);

sub CLEAN_REGEX {
    return qr{\s$|/|@{[shift->get_instance('FilePath')->ILLEGAL_CHAR_REGEXP]}}o;
}

sub EMPTY_VALUE {
    return '(No Subject)';
}

sub clean_and_trim {
    return lc(shift->trim_literal($_[0], 1));
}

sub trim_literal {
    my($proto, $value, $clean) = @_;
    $value = ''
	unless defined($value);
    $value =~ s/\s+/ /;
    0 while $value =~ s/^(\s+|\[\S*\]|[a-z]{1,3}(:|\[\d+\])|\.)//i;
    $value =~ s{@{[$proto->CLEAN_REGEX]}}{}g
	if $clean;
    return length($value) ? substr($value, 0, $proto->get_width)
	: $proto->EMPTY_VALUE;
}

1;