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|
#-*- perl -*-
#
# Copyright (C) 2001 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.
#
# $Id$
# $FML$
#
package FML::Header::Subject;
use strict;
use vars qw(@ISA @EXPORT @EXPORT_OK);
use Carp;
use FML::Log qw(Log LogWarn LogError);
=head1 NAME
FML::Header::Subject - manipule the header subject
=head1 SYNOPSIS
use FML::Header::Subject;
FML::Header::Subject->rewrite_subject_tag($header, $config, $args);
=head1 DESCRIPTION
a collection of functions to manipulate the header subject.
=head1 METHODS
=head2 C<new()>
the usual constructor.
=cut
# Descriptions: usual constructor
# Arguments: $self
# Side Effects: none
# Return Value: object
sub new
{
my ($self) = @_;
my ($type) = ref($self) || $self;
my $me = {};
return bless $me, $type;
}
=head2 C<rewrite_subject_tag($header, $config, $args)>
add or update the subject tag for C<$header>
=cut
# Descriptions: add or update the subject tag
# Arguments: $self $header $config $args
# Side Effects: the header subject is rewritten
# Return Value: none
sub rewrite_subject_tag
{
my ($self, $header, $config, $args) = @_;
# for example, ml_name = elena
my $ml_name = $config->{ ml_name };
my $tag = $config->{ subject_tag };
my $subject = $header->get('subject');
# cut off Re: Re: Re: ...
$self->_cut_off_reply(\$subject);
# de-tag
$subject = _delete_subject_tag( $subject, $tag );
# cut off Re: Re: Re: ...
$self->_cut_off_reply(\$subject);
# add(prepend) the updated tag
$tag = sprintf($tag, $args->{ id });
my $new_subject = $tag." ".$subject;
$header->replace('subject', $new_subject);
}
# Descriptions: remove tag-like string
# Arguments: $subject $args
# XXX non OO type function
# Side Effects: none
# Return Value: subject string
sub _delete_subject_tag
{
my ($subject, $tag) = @_;
my $retag = _regexp_compile($tag);
$subject =~ s/$retag//g;
$subject =~ s/^\s*//;
return $subject;
}
=head2 C<regexp_compile($string)>
build a regular expression to trap C<$string>.
=cut
# Descriptions: wrapper for _regexp_compile
# Arguments: $self $args
# Side Effects: none
# Return Value: string (regular expression)
sub regexp_compile
{
my ($self, $string) = @_;
_regexp_compile($string);
}
# Descriptions: create regexp for a subject tag, for example
# "[%s %05d]" => "\[\S+ \d+\]"
# Arguments: a subject tag string
# XXX non OO type function
# Side Effects: none
# Return Value: a regexp for the given tag
sub _regexp_compile
{
my ($s) = @_;
$s =~ s@\%s@\\S+@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;
$s;
}
=head2 C<is_reply($subject_string)>
speculate C<$subject_string> looks a reply message or not?
It depends on each language specific representations.
Now we can trap Japanese specific keywords.
=cut
# Descriptions: speculate $subject looks a reply message or not?
# Arguments: $self $subject
# Side Effects: none
# Return Value: 1 (looks reply message) or 0
sub is_reply
{
my ($self, $subject) = @_;
return 1 if $subject =~ /^\s*Re:/i;
my $pkg = 'Dialect::Japanese::Subject';
eval qq{ require $pkg; $pkg->import();};
unless ($@) {
return 1 if &Dialect::Japanese::Subject::is_reply($subject);
};
return 0;
}
# Descriptions: cut off reply keywords like "Re:"
# Arguments: $self $r_subject
# $r_subject is SCALAR REREFENCE to the subject string
# Side Effects: none
# Return Value: none
sub _cut_off_reply
{
my ($self, $r_subject) = @_;
my $pkg = 'Dialect::Japanese::Subject';
eval qq{ require $pkg; $pkg->import();};
unless ($@) {
$$r_subject =
&Dialect::Japanese::Subject::cut_off_reply_tag($$r_subject);
}
else {
Log($@);
}
}
=head1 AUTHOR
Ken'ichi Fukamachi
=head1 COPYRIGHT
Copyright (C) 2001 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
FML::Header::Subject appeared in fml5 mailing list driver package.
See C<http://www.fml.org/> for more details.
=cut
1;
|
