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#-*- perl -*-
#
# Copyright (C) 2018 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.
#
# $FML$
#
package Mail::Message::Encode::Perl;
use strict;
use vars qw(@ISA @EXPORT @EXPORT_OK $AUTOLOAD);
use Carp;
use Encode;
use Encode::MIME::Header;
=head1 NAME
Mail::Message::Encode::Perl - Perl (character-oriented) based Encoding
=head1 SYNOPSIS
use Mail::Message::Encode::Perl;
my $obj = new Mail::Message::Encode::Perl;
my $pif_str = $obj->mime_header_decode($str);
# ("[BSG:75] Re: Exodus Part II", "UTF-8", "base64")
# ... several works ...
$pif_str =~ s/Re: //;
Mail::Message::Subject->rewrite_XXX($pif_str);
$mime_str = $obj->mime_header_encode($pif_str);
print $mime_str;
=head1 DESCRIPTION
=head1 METHODS
=head2 new()
constructor.
=cut
# Descriptions: constructor.
# Arguments: OBJ($self) HASH_REF($args)
# Side Effects: none
# Return Value: OBJ
sub new
{
my ($self, $args) = @_;
my ($type) = ref($self) || $self;
my $me = {};
return bless $me, $type;
}
=head2 guess_encoding($str)
speculate the encoding of $str string. $str is checked by
Unicode::Japanese. Unicode::Japanes::getcode() can detect the following
code: jis, sjis, euc, utf8, ucs2, ucs4, utf16, utf16-ge, utf16-le,
utf32, utf32-ge, utf32-le, ascii, binary, sjis-imode, sjis-doti,
sjis-jsky.
C<CAUTION>: Hmm, we suppose we handle only Japanese and English here...
=cut
# Descriptions: speculate code of $str string.
# Arguments: OBJ($self) STR($str)
# Side Effects: none
# Return Value: STR
sub guess_encoding
{
my ($self, $str) = @_;
use Unicode::Japanese;
my $obj = new Unicode::Japanese;
return $obj->getcode($str);
}
=head2 mime_header_enecode($str)
encode the given Perl internal format string to the mime header one.
=head2 mime_header_decode($str)
decode the given mime header format string to the Perl internal one.
=head3 CAUTION
In the current Perl (for backward compatibility),
we need to handle the string this way.
IN -> decode() -> Perl Internal UTF8 format -> encode() -> OUT
=cut
# Descriptions: encode the Perl internal format string to the mime header one.
# Arguments: OBJ($self) STR($pif_str)
# Side Effects: none
# Return Value: STR
sub mime_header_encode
{
my ($self, $pif_str) = @_;
my $m;
# XXX how we specify the encoding ?
if (1) { # base64 by default
$m = encode("MIME-Header", $pif_str, Encode::FB_WARN);
}
else {
$m = encode("MIME-Q", $pif_str, Encode::FB_WARN);
}
return $m;
}
# Descriptions: decode mime header format string to the Perl internal one.
# Arguments: OBJ($self) STR($pef_str)
# Side Effects: none
# Return Value: STR(perl internal UTF8 format)
sub mime_header_decode
{
my ($self, $pef_str) = @_;
decode("MIME-Header", $pef_str);
}
# Descriptions: decode mime header format string and return it as
# printable format not the Perl internal one.
# Arguments: OBJ($self) STR($pef_str)
# Side Effects: none
# Return Value: STR
sub mime_header_decode_as_octets
{
my ($self, $pef_str) = @_;
# XXX-TODO hard-coded now anyway.
my $code = "EUC-JP";
encode($code, decode("MIME-Header", $pef_str));
}
=head2 convert_from_internal_to_external_form($pif_str)
convert the given Perl internal form to the external printable one.
=cut
# Descriptions: convert the given Perl internal form
# to the external printable one.
# Arguments: OBJ($self) STR($pif_str)
# Side Effects: none
# Return Value: STR
sub convert_from_internal_to_external_form
{
my ($self, $pif_str) = @_;
# XXX-TODO hard-coded now anyway.
my $code = "EUC-JP";
utf8::is_utf8($pif_str) ? encode($code, $pif_str) : $pif_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) 2018 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::Encode first appeared in fml8 mailing list driver package.
See C<http://www.fml.org/> for more details.
=cut
1;
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