1package # This is JSON::backportPP
2    JSON::backportPP56;
3
4use 5.006;
5use strict;
6
7my @properties;
8
9$JSON::PP56::VERSION = '1.08';
10
11BEGIN {
12
13    sub utf8::is_utf8 {
14        my $len =  length $_[0]; # char length
15        {
16            use bytes; #  byte length;
17            return $len != length $_[0]; # if !=, UTF8-flagged on.
18        }
19    }
20
21
22    sub utf8::upgrade {
23        ; # noop;
24    }
25
26
27    sub utf8::downgrade ($;$) {
28        return 1 unless ( utf8::is_utf8( $_[0] ) );
29
30        if ( _is_valid_utf8( $_[0] ) ) {
31            my $downgrade;
32            for my $c ( unpack( "U*", $_[0] ) ) {
33                if ( $c < 256 ) {
34                    $downgrade .= pack("C", $c);
35                }
36                else {
37                    $downgrade .= pack("U", $c);
38                }
39            }
40            $_[0] = $downgrade;
41            return 1;
42        }
43        else {
44            Carp::croak("Wide character in subroutine entry") unless ( $_[1] );
45            0;
46        }
47    }
48
49
50    sub utf8::encode ($) { # UTF8 flag off
51        if ( utf8::is_utf8( $_[0] ) ) {
52            $_[0] = pack( "C*", unpack( "C*", $_[0] ) );
53        }
54        else {
55            $_[0] = pack( "U*", unpack( "C*", $_[0] ) );
56            $_[0] = pack( "C*", unpack( "C*", $_[0] ) );
57        }
58    }
59
60
61    sub utf8::decode ($) { # UTF8 flag on
62        if ( _is_valid_utf8( $_[0] ) ) {
63            utf8::downgrade( $_[0] );
64            $_[0] = pack( "U*", unpack( "U*", $_[0] ) );
65        }
66    }
67
68
69    *JSON::PP::JSON_PP_encode_ascii      = \&_encode_ascii;
70    *JSON::PP::JSON_PP_encode_latin1     = \&_encode_latin1;
71    *JSON::PP::JSON_PP_decode_surrogates = \&JSON::PP::_decode_surrogates;
72    *JSON::PP::JSON_PP_decode_unicode    = \&JSON::PP::_decode_unicode;
73
74    unless ( defined &B::SVp_NOK ) { # missing in B module.
75        eval q{ sub B::SVp_NOK () { 0x02000000; } };
76    }
77
78}
79
80
81
82sub _encode_ascii {
83    join('',
84        map {
85            $_ <= 127 ?
86                chr($_) :
87            $_ <= 65535 ?
88                sprintf('\u%04x', $_) : sprintf('\u%x\u%x', JSON::PP::_encode_surrogates($_));
89        } _unpack_emu($_[0])
90    );
91}
92
93
94sub _encode_latin1 {
95    join('',
96        map {
97            $_ <= 255 ?
98                chr($_) :
99            $_ <= 65535 ?
100                sprintf('\u%04x', $_) : sprintf('\u%x\u%x', JSON::PP::_encode_surrogates($_));
101        } _unpack_emu($_[0])
102    );
103}
104
105
106sub _unpack_emu { # for Perl 5.6 unpack warnings
107    return   !utf8::is_utf8($_[0]) ? unpack('C*', $_[0])
108           : _is_valid_utf8($_[0]) ? unpack('U*', $_[0])
109           : unpack('C*', $_[0]);
110}
111
112
113sub _is_valid_utf8 {
114    my $str = $_[0];
115    my $is_utf8;
116
117    while ($str =~ /(?:
118          (
119             [\x00-\x7F]
120            |[\xC2-\xDF][\x80-\xBF]
121            |[\xE0][\xA0-\xBF][\x80-\xBF]
122            |[\xE1-\xEC][\x80-\xBF][\x80-\xBF]
123            |[\xED][\x80-\x9F][\x80-\xBF]
124            |[\xEE-\xEF][\x80-\xBF][\x80-\xBF]
125            |[\xF0][\x90-\xBF][\x80-\xBF][\x80-\xBF]
126            |[\xF1-\xF3][\x80-\xBF][\x80-\xBF][\x80-\xBF]
127            |[\xF4][\x80-\x8F][\x80-\xBF][\x80-\xBF]
128          )
129        | (.)
130    )/xg)
131    {
132        if (defined $1) {
133            $is_utf8 = 1 if (!defined $is_utf8);
134        }
135        else {
136            $is_utf8 = 0 if (!defined $is_utf8);
137            if ($is_utf8) { # eventually, not utf8
138                return;
139            }
140        }
141    }
142
143    return $is_utf8;
144}
145
146
1471;
148__END__
149
150=pod
151
152=head1 NAME
153
154JSON::PP56 - Helper module in using JSON::PP in Perl 5.6
155
156=head1 DESCRIPTION
157
158JSON::PP calls internally.
159
160=head1 AUTHOR
161
162Makamaka Hannyaharamitu, E<lt>makamaka[at]cpan.orgE<gt>
163
164
165=head1 COPYRIGHT AND LICENSE
166
167Copyright 2007-2009 by Makamaka Hannyaharamitu
168
169This library is free software; you can redistribute it and/or modify
170it under the same terms as Perl itself.
171
172=cut
173
174