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|
package JSON::PP5005;
use 5.005;
use strict;
my @properties;
$JSON::PP5005::VERSION = '1.04';
BEGIN {
*JSON::PP::JSON_PP_encode_ascii = \&_encode_ascii;
*JSON::PP::JSON_PP_encode_latin1 = \&_encode_latin1;
*JSON::PP::JSON_PP_decode_surrogates = \&_decode_surrogates;
*JSON::PP::JSON_PP_decode_unicode = \&_decode_unicode;
sub utf8::is_utf8 {
0; # It is considered that UTF8 flag off for Perl 5.005.
}
sub utf8::upgrade {
}
sub utf8::downgrade {
1; # must always return true.
}
sub utf8::encode {
}
sub utf8::decode {
}
# missing in B module.
sub B::SVf_IOK () { 0x00010000; }
sub B::SVf_NOK () { 0x00020000; }
sub B::SVf_POK () { 0x00040000; }
sub B::SVp_IOK () { 0x01000000; }
sub B::SVp_NOK () { 0x02000000; }
$INC{'bytes.pm'} = 1; # dummy
push @JSON::PP::_properties, 'ascii', 'latin1';
}
sub _encode_ascii {
join('', map { $_ <= 127 ? chr($_) : sprintf('\u%04x', $_) } unpack('C*', $_[0]) );
}
sub _encode_latin1 {
join('', map { chr($_) } unpack('C*', $_[0]) );
}
sub _decode_surrogates { # from http://homepage1.nifty.com/nomenclator/unicode/ucs_utf.htm
my $uni = 0x10000 + (hex($_[0]) - 0xD800) * 0x400 + (hex($_[1]) - 0xDC00); # from perlunicode
my $bit = unpack('B32', pack('N', $uni));
if ( $bit =~ /^00000000000(...)(......)(......)(......)$/ ) {
my ($w, $x, $y, $z) = ($1, $2, $3, $4);
return pack('B*', sprintf('11110%s10%s10%s10%s', $w, $x, $y, $z));
}
else {
Carp::croak("Invalid surrogate pair");
}
}
sub _decode_unicode {
my ($u) = @_;
my ($utf8bit);
my $bit = unpack("B*", pack("H*", $u));
if ( $bit =~ /^00000(.....)(......)$/ ) {
$utf8bit = sprintf('110%s10%s', $1, $2);
}
elsif ( $bit =~ /^(....)(......)(......)$/ ) {
$utf8bit = sprintf('1110%s10%s10%s', $1, $2, $3);
}
else {
Carp::croak("Invalid escaped unicode");
}
return pack('B*', $utf8bit);
}
sub _is_valid_utf8 {
my $str = $_[0];
my $is_utf8;
while ($str =~ /(?:
(
[\x00-\x7F]
|[\xC2-\xDF][\x80-\xBF]
|[\xE0][\xA0-\xBF][\x80-\xBF]
|[\xE1-\xEC][\x80-\xBF][\x80-\xBF]
|[\xED][\x80-\x9F][\x80-\xBF]
|[\xEE-\xEF][\x80-\xBF][\x80-\xBF]
|[\xF0][\x90-\xBF][\x80-\xBF][\x80-\xBF]
|[\xF1-\xF3][\x80-\xBF][\x80-\xBF][\x80-\xBF]
|[\xF4][\x80-\x8F][\x80-\xBF][\x80-\xBF]
)
| (.)
)/xg)
{
if (defined $1) {
$is_utf8 = 1 if (!defined $is_utf8);
}
else {
$is_utf8 = 0 if (!defined $is_utf8);
if ($is_utf8) { # eventually, not utf8
return;
}
}
}
return $is_utf8;
}
1;
__END__
=pod
=head1 NAME
JSON::PP5005 - Helper module in using JSON::PP in Perl 5.005
=head1 DESCRIPTION
JSON::PP calls internally.
=head1 AUTHOR
Makamaka Hannyaharamitu, E<lt>makamaka[at]cpan.orgE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright 2007 by Makamaka Hannyaharamitu
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut
|
