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#-*- perl -*-
#
# Copyright (C) 2004 Ken'ichi Fukamachi
#
# $FML: Subject.pm,v 1.1 2004/02/04 15:11:38 fukachan Exp $
#
package Mail::Message::Subject;
use strict;
use vars qw(@ISA @EXPORT @EXPORT_OK $AUTOLOAD);
use Carp;
# base class is "Mail::Message::String".
use Mail::Message::String;
@ISA = qw(Mail::Message::String);
=head1 NAME
Mail::Message::Subject - utilities to manipulate subject string.
=head1 SYNOPSIS
my $subject = new Mail::Message::Subject $header->get('subject');
if ($subject->has_reply_tag()) {
$subject->delete_dup_reply_tag();
}
$subject->mime_decode();
my $subject_str = $subject->as_str();
=head1 DESCRIPTION
=head2 new($subject)
constructor.
=cut
# Descriptions: constructor.
# Arguments: OBJ($self) STR($subject)
# Side Effects: none
# Return Value: OBJ
sub new
{
my ($self, $subject) = @_;
$self->SUPER::new($subject);
}
=head1 Re: TAG HANLING
=cut
# Descriptions: cut off reply keywords like "Re:".
# Arguments: OBJ($self)
# Side Effects: none
# Return Value: none
sub delete_dup_reply_tag
{
my ($self) = @_;
my $subject = $self->as_str();
my $charset = $self->get_mime_charset();
# XXX-TODO: care for not Japanese string!
if ($charset =~ /iso-2022-jp/io) {
use Mail::Message::Language::Japanese::Subject;
my $sbj = new Mail::Message::Language::Japanese::Subject;
$subject = $sbj->cut_off_reply_tag($subject);
$self->set($subject);
}
}
# Descriptions: speculate $subject looks a reply message or not?
# Arguments: OBJ($self)
# Side Effects: none
# Return Value: 1 (looks reply message) or 0
sub has_reply_tag
{
my ($self) = @_;
my $subject = $self->as_str();
my $charset = $self->get_mime_charset();
return 1 if $subject =~ /^\s*Re:/i;
# XXX anyway, we use this method always :-)
# XXX-TODO: care for not Japanese string!
if (1 || $charset =~ /iso-2022-jp/io) {
# XXX-TODO: method-ify ?
use Mail::Message::Language::Japanese::Subject;
if (&Mail::Message::Language::Japanese::Subject::is_reply($subject)) {
return 1;
}
}
return 0;
}
=head1 ML TAG HANDLING
=cut
# Descriptions: remove tag-like string.
# Arguments: OBJ($self) STR($tag)
# Side Effects: none
# Return Value: STR(subject string)
sub delete_tag
{
my ($self, $tag) = @_;
my $subject = $self->as_str();
# for example, ml_name = elena
# if $tag has special regexp such as \U$ml_name\E or \L$ml_name\E
if (defined $tag) {
if ($tag =~ /\\E/o && $tag =~ /\\U|\\L/o) {
eval qq{ \$tag = "$tag";};
carp($@) if $@;
}
my $retag = $self->_regexp_compile($tag);
$subject =~ s/$retag//g;
$subject =~ s/^\s*//;
$self->set($subject);
}
return $subject;
}
# Descriptions: create regexp for a subject tag, for example
# "[%s %05d]" => "\[\S+ \d+\]"
# not OO style.
# Arguments: OBJ($self) STR($s)
# $s == a subject tag string
# Side Effects: none
# Return Value: STR(a regexp for the given tag)
sub _regexp_compile
{
my ($self, $s) = @_;
if (defined $s) {
$s = quotemeta( $s );
$s =~ s@\\\%@\%@g;
$s =~ s@\%s@\\S+@g;
$s =~ s@\%d@\\d+@g;
$s =~ s@\%0\d+d@\\d+@g;
$s =~ s@\%\d+d@\\d+@g;
$s =~ s@\%\-\d+d@\\d+@g;
# quote for regexp substitute: [ something ] -> \[ something \]
# $s =~ s/^(.)/quotemeta($1)/e;
# $s =~ s/(.)$/quotemeta($1)/e;
return $s;
}
else {
return '';
}
}
######################################################################
#
# debug
#
# Descriptions: debug function.
# Arguments: STR($str)
# Side Effects: none
# Return Value: none
sub _debug
{
my ($str) = @_;
my $sbj = new Mail::Message::Subject $str;
# start.
print "\n";
print $str, " (original)\n";
# mime charset
print "# charset = ", $sbj->get_mime_charset() ,"\n";
# mime decode test.
$sbj->mime_decode();
print $sbj->as_str() ,"\n";
# delete subject tag.
if ($sbj->has_reply_tag()) {
print "# looks replied message. try cut off the dup tag.\n";
$sbj->delete_dup_reply_tag();
print $sbj->as_str(), " (cut off reply tag)\n";
}
# mime decode test.
$sbj->mime_encode();
print $sbj->as_str() ,"\n";
}
if ($0 eq __FILE__) {
my $str = '=?ISO-2022-JP?B?GyRCJDckRCRiJHMbKEI=?=';
_debug($str);
_debug("Re: $str");
_debug("Re: Re: $str");
}
=head1 CODING STYLE
See C<http://www.fml.org/software/FNF/> on fml coding style guide.
=head1 AUTHOR
Ken'ichi Fukamachi
=head1 COPYRIGHT
Copyright (C) 2004 Ken'ichi Fukamachi
All rights reserved. This program is free software; you can
redistribute it and/or modify it under the same terms as Perl itself.
=head1 HISTORY
Mail::Message::Subject first appeared in fml8 mailing list driver package.
See C<http://www.fml.org/> for more details.
C<Subject_to_unixtime> is imported from fml 4.0-current libmti.pl.
=cut
1;
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