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package # This is JSON::backportPP
    JSON::backportPP56;

use 5.006;
use strict;

my @properties;

$JSON::PP56::VERSION = '1.08';

BEGIN {

sub utf8::is_utf8 {
        my $len =  length $_[0]; # char length
        {
            use bytes; #  byte length;
            return $len != length $_[0]; # if !=, UTF8-flagged on.
        }
    }

sub utf8::upgrade {
        ; # noop;
    }

sub utf8::downgrade ($;$) {
        return 1 unless ( utf8::is_utf8( $_[0] ) );

if ( _is_valid_utf8( $_[0] ) ) {
            my $downgrade;
            for my $c ( unpack( "U*", $_[0] ) ) {
                if ( $c < 256 ) {
                    $downgrade .= pack("C", $c);
                }
                else {
                    $downgrade .= pack("U", $c);
                }
            }
            $_[0] = $downgrade;
            return 1;
        }
        else {
            Carp::croak("Wide character in subroutine entry") unless ( $_[1] );
            0;
        }
    }

sub utf8::encode ($) { # UTF8 flag off
        if ( utf8::is_utf8( $_[0] ) ) {
            $_[0] = pack( "C*", unpack( "C*", $_[0] ) );
        }
        else {
            $_[0] = pack( "U*", unpack( "C*", $_[0] ) );
            $_[0] = pack( "C*", unpack( "C*", $_[0] ) );
        }
    }

sub utf8::decode ($) { # UTF8 flag on
        if ( _is_valid_utf8( $_[0] ) ) {
            utf8::downgrade( $_[0] );
            $_[0] = pack( "U*", unpack( "U*", $_[0] ) );
        }
    }

*JSON::PP::JSON_PP_encode_ascii      = \&_encode_ascii;
    *JSON::PP::JSON_PP_encode_latin1     = \&_encode_latin1;
    *JSON::PP::JSON_PP_decode_surrogates = \&JSON::PP::_decode_surrogates;
    *JSON::PP::JSON_PP_decode_unicode    = \&JSON::PP::_decode_unicode;

unless ( defined &B::SVp_NOK ) { # missing in B module.
        eval q{ sub B::SVp_NOK () { 0x02000000; } };
    }

}

sub _encode_ascii {
    join('',
        map {
            $_ <= 127 ?
                chr($_) :
            $_ <= 65535 ?
                sprintf('\u%04x', $_) : sprintf('\u%x\u%x', JSON::PP::_encode_surrogates($_));
        } _unpack_emu($_[0])
    );
}

sub _encode_latin1 {
    join('',
        map {
            $_ <= 255 ?
                chr($_) :
            $_ <= 65535 ?
                sprintf('\u%04x', $_) : sprintf('\u%x\u%x', JSON::PP::_encode_surrogates($_));
        } _unpack_emu($_[0])
    );
}

sub _unpack_emu { # for Perl 5.6 unpack warnings
    return   !utf8::is_utf8($_[0]) ? unpack('C*', $_[0]) 
           : _is_valid_utf8($_[0]) ? unpack('U*', $_[0])
           : unpack('C*', $_[0]);
}

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::PP56 - Helper module in using JSON::PP in Perl 5.6

=head1 DESCRIPTION

JSON::PP calls internally.

=head1 AUTHOR

Makamaka Hannyaharamitu, E<lt>makamaka[at]cpan.orgE<gt>

=head1 COPYRIGHT AND LICENSE

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.

=cut

${this.title}

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