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4384 dpurdie 1 
package # This is JSON::backportPP
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    JSON::backportPP56;
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use 5.006;
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use strict;
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my @properties;
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$JSON::PP56::VERSION = '1.08';
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BEGIN {
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    sub utf8::is_utf8 {
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        my $len =  length $_[0]; # char length
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        {
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            use bytes; #  byte length;
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            return $len != length $_[0]; # if !=, UTF8-flagged on.
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        }
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    }
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    sub utf8::upgrade {
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        ; # noop;
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    }
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    sub utf8::downgrade ($;$) {
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        return 1 unless ( utf8::is_utf8( $_[0] ) );
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        if ( _is_valid_utf8( $_[0] ) ) {
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            my $downgrade;
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            for my $c ( unpack( "U*", $_[0] ) ) {
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                if ( $c < 256 ) {
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                    $downgrade .= pack("C", $c);
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                }
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                else {
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                    $downgrade .= pack("U", $c);
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                }
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            }
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            $_[0] = $downgrade;
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            return 1;
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        }
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        else {
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            Carp::croak("Wide character in subroutine entry") unless ( $_[1] );
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            0;
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        }
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    }
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    sub utf8::encode ($) { # UTF8 flag off
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        if ( utf8::is_utf8( $_[0] ) ) {
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            $_[0] = pack( "C*", unpack( "C*", $_[0] ) );
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        }
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        else {
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            $_[0] = pack( "U*", unpack( "C*", $_[0] ) );
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            $_[0] = pack( "C*", unpack( "C*", $_[0] ) );
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        }
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    }
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    sub utf8::decode ($) { # UTF8 flag on
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        if ( _is_valid_utf8( $_[0] ) ) {
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            utf8::downgrade( $_[0] );
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            $_[0] = pack( "U*", unpack( "U*", $_[0] ) );
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        }
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    }
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    *JSON::PP::JSON_PP_encode_ascii      = \&_encode_ascii;
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    *JSON::PP::JSON_PP_encode_latin1     = \&_encode_latin1;
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    *JSON::PP::JSON_PP_decode_surrogates = \&JSON::PP::_decode_surrogates;
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    *JSON::PP::JSON_PP_decode_unicode    = \&JSON::PP::_decode_unicode;
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    unless ( defined &B::SVp_NOK ) { # missing in B module.
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        eval q{ sub B::SVp_NOK () { 0x02000000; } };
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    }
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}
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sub _encode_ascii {
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    join('',
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        map {
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            $_ <= 127 ?
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                chr($_) :
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            $_ <= 65535 ?
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                sprintf('\u%04x', $_) : sprintf('\u%x\u%x', JSON::PP::_encode_surrogates($_));
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        } _unpack_emu($_[0])
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    );
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}
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sub _encode_latin1 {
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    join('',
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        map {
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            $_ <= 255 ?
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                chr($_) :
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            $_ <= 65535 ?
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                sprintf('\u%04x', $_) : sprintf('\u%x\u%x', JSON::PP::_encode_surrogates($_));
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        } _unpack_emu($_[0])
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    );
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}
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sub _unpack_emu { # for Perl 5.6 unpack warnings
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    return   !utf8::is_utf8($_[0]) ? unpack('C*', $_[0])
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           : _is_valid_utf8($_[0]) ? unpack('U*', $_[0])
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           : unpack('C*', $_[0]);
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}
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sub _is_valid_utf8 {
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    my $str = $_[0];
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    my $is_utf8;
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    while ($str =~ /(?:
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          (
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             [\x00-\x7F]
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            |[\xC2-\xDF][\x80-\xBF]
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            |[\xE0][\xA0-\xBF][\x80-\xBF]
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            |[\xE1-\xEC][\x80-\xBF][\x80-\xBF]
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            |[\xED][\x80-\x9F][\x80-\xBF]
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            |[\xEE-\xEF][\x80-\xBF][\x80-\xBF]
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            |[\xF0][\x90-\xBF][\x80-\xBF][\x80-\xBF]
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            |[\xF1-\xF3][\x80-\xBF][\x80-\xBF][\x80-\xBF]
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            |[\xF4][\x80-\x8F][\x80-\xBF][\x80-\xBF]
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          )
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        | (.)
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    )/xg)
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    {
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        if (defined $1) {
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            $is_utf8 = 1 if (!defined $is_utf8);
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        }
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        else {
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            $is_utf8 = 0 if (!defined $is_utf8);
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            if ($is_utf8) { # eventually, not utf8
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                return;
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            }
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        }
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    }
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    return $is_utf8;
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}
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1;
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__END__
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=pod
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=head1 NAME
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JSON::PP56 - Helper module in using JSON::PP in Perl 5.6
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=head1 DESCRIPTION
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JSON::PP calls internally.
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=head1 AUTHOR
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Makamaka Hannyaharamitu, E<lt>makamaka[at]cpan.orgE<gt>
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=head1 COPYRIGHT AND LICENSE
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Copyright 2007-2012 by Makamaka Hannyaharamitu
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This library is free software; you can redistribute it and/or modify
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it under the same terms as Perl itself.
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=cut
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