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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 Dialect::Japanese::Utils;
use strict;
use vars qw(@ISA @EXPORT @EXPORT_OK $AUTOLOAD);
use Carp;
=head1 NAME
Dialect::Japanese::Utils - what is this
=head1 SYNOPSIS
use Dialect::Japanese::Utils qw(is_iso2022jp_string);
if ( is_iso2022jp_string($string) ) { do_something_if_Japanese;}
=head1 DESCRIPTION
Utilities for Japanse string
=head1 METHODS
=head2 <is_iso2022jp_string($string)>
check whether $string looks Japanese.
return 1 if it looks so.
=cut
require Exporter;
@ISA = qw(Exporter);
@EXPORT_OK = qw(is_iso2022jp_string);
sub is_iso2022jp_string
{
my ($buf) = @_;
return (not _look_not_iso2022jp_string($buf));
}
# based on fml-support: 07020, 07029
# Koji Sudo <koji@cherry.or.jp>
# Takahiro Kambe <taca@sky.yamashina.kyoto.jp>
# check the given buffer has unusual Japanese (not ISO-2022-JP)
sub _look_not_iso2022jp_string
{
my ($buf) = @_;
# check 8 bit on
if ($buf =~ /[\x80-\xFF]/){
return 1;
}
# check SI/SO
if ($buf =~ /[\016\017]/) {
return 1;
}
# HANKAKU KANA
if ($buf =~ /\033\(I/) {
return 1;
}
# MSB flag or other control sequences
if ($buf =~ /[\001-\007\013\015\020-\032\034-\037\177-\377]/) {
return 1;
}
0; # O.K.
}
=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
Dialect::Japanese::Utils appeared in fml5 mailing list driver package.
See C<http://www.fml.org/> for more details.
=cut
1;
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