1package String::Multibyte::Big5Plus;
2
3use vars qw($VERSION);
4$VERSION = '1.12';
5
6+{
7    charset  => 'Big-5 Plus',
8
9    regexp   => '(?:[\x00-\x7F]|[\x81-\xFE][\x40-\x7E\x80-\xFE])',
10
11    cmpchar => sub { $_[0] cmp $_[1] },
12
13    nextchar => sub {
14	my $ch = shift;
15	my $len = length $ch;
16	if ($len < 1 || 2 < $len) {
17	    return undef;
18	}
19	elsif ($len == 1) {
20	    return $ch eq "\x7F"
21		? "\x81\x40"
22		: chr(ord($ch)+1);
23	}
24	else {
25	    my($c, $d) = unpack('CC', $ch);
26	    return $ch eq "\xFE\xFE"
27		? undef
28		: $d == 0xFE
29		    ? chr($c+1)."\x40"
30		    : $d == 0x7E
31			? chr($c)."\x80"
32			: pack('CC', $c, $d+1);
33	}
34    },
35};
36
37__END__
38
39=head1 NAME
40
41String::Multibyte::Big5Plus - internally used by String::Multibyte
42for Big-5 Plus
43
44=head1 SYNOPSIS
45
46    use String::Multibyte;
47
48    $big5p = String::Multibyte->new('Big5Plus');
49    $big5p_length = $big5p->length($big5p_string);
50
51=head1 DESCRIPTION
52
53C<String::Multibyte::Big5Plus> is used for manipulation of strings
54in Big-5 Plus.
55
56Byte range of single-byte characters:
57C<0x00..0x7F>.
58
59Leading byte range of double-byte characters:
60C<0x81..0xFE>.
61
62Trailing byte range of double-byte characters:
63C<0x40..0x7E> and C<0x80..0xFE>.
64
65Character order (invalid code points are excluded):
66C<0x00..0x7F>, C<0x8140..0xFEFE>
67
68=head1 SEE ALSO
69
70L<String::Multibyte>
71
72=cut
73