data/lib/JSON/backportPP/Compat5005.pm

   1 package # This is JSON::backportPP
   2     JSON::backportPP5005;
   3
   4 use 5.005;
   5 use strict;
   6
   7 my @properties;
   8
   9 $JSON::PP5005::VERSION = '1.10';
  10
  11 BEGIN {
  12
  13     sub utf8::is_utf8 {
  14         0; # It is considered that UTF8 flag off for Perl 5.005.
  15     }
  16
  17     sub utf8::upgrade {
  18     }
  19
  20     sub utf8::downgrade {
  21         1; # must always return true.
  22     }
  23
  24     sub utf8::encode  {
  25     }
  26
  27     sub utf8::decode {
  28     }
  29
  30     *JSON::PP::JSON_PP_encode_ascii      = \&_encode_ascii;
  31     *JSON::PP::JSON_PP_encode_latin1     = \&_encode_latin1;
  32     *JSON::PP::JSON_PP_decode_surrogates = \&_decode_surrogates;
  33     *JSON::PP::JSON_PP_decode_unicode    = \&_decode_unicode;
  34
  35     # missing in B module.
  36     sub B::SVp_IOK () { 0x01000000; }
  37     sub B::SVp_NOK () { 0x02000000; }
  38     sub B::SVp_POK () { 0x04000000; }
  39
  40     $INC{'bytes.pm'} = 1; # dummy
  41 }
  42
  43
  44
  45 sub _encode_ascii {
  46     join('', map { $_ <= 127 ? chr($_) : sprintf('\u%04x', $_) } unpack('C*', $_[0]) );
  47 }
  48
  49
  50 sub _encode_latin1 {
  51     join('', map { chr($_) } unpack('C*', $_[0]) );
  52 }
  53
  54
  55 sub _decode_surrogates { # from http://homepage1.nifty.com/nomenclator/unicode/ucs_utf.htm
  56     my $uni = 0x10000 + (hex($_[0]) - 0xD800) * 0x400 + (hex($_[1]) - 0xDC00); # from perlunicode
  57     my $bit = unpack('B32', pack('N', $uni));
  58
  59     if ( $bit =~ /^00000000000(...)(......)(......)(......)$/ ) {
  60         my ($w, $x, $y, $z) = ($1, $2, $3, $4);
  61         return pack('B*', sprintf('11110%s10%s10%s10%s', $w, $x, $y, $z));
  62     }
  63     else {
  64         Carp::croak("Invalid surrogate pair");
  65     }
  66 }
  67
  68
  69 sub _decode_unicode {
  70     my ($u) = @_;
  71     my ($utf8bit);
  72
  73     if ( $u =~ /^00([89a-f][0-9a-f])$/i ) { # 0x80-0xff
  74          return pack( 'H2', $1 );
  75     }
  76
  77     my $bit = unpack("B*", pack("H*", $u));
  78
  79     if ( $bit =~ /^00000(.....)(......)$/ ) {
  80         $utf8bit = sprintf('110%s10%s', $1, $2);
  81     }
  82     elsif ( $bit =~ /^(....)(......)(......)$/ ) {
  83         $utf8bit = sprintf('1110%s10%s10%s', $1, $2, $3);
  84     }
  85     else {
  86         Carp::croak("Invalid escaped unicode");
  87     }
  88
  89     return pack('B*', $utf8bit);
  90 }
  91
  92
  93 sub JSON::PP::incr_text {
  94     $_[0]->{_incr_parser} ||= JSON::PP::IncrParser->new;
  95
  96     if ( $_[0]->{_incr_parser}->{incr_parsing} ) {
  97         Carp::croak("incr_text can not be called when the incremental parser already started parsing");
  98     }
  99
 100     $_[0]->{_incr_parser}->{incr_text} = $_[1] if ( @_ > 1 );
 101     $_[0]->{_incr_parser}->{incr_text};
 102 }
 103
 104
 105 1;
 106 __END__
 107
 108 =pod
 109
 110 =head1 NAME
 111
 112 JSON::PP5005 - Helper module in using JSON::PP in Perl 5.005
 113
 114 =head1 DESCRIPTION
 115
 116 JSON::PP calls internally.
 117
 118 =head1 AUTHOR
 119
 120 Makamaka Hannyaharamitu, E<lt>makamaka[at]cpan.orgE<gt>
 121
 122
 123 =head1 COPYRIGHT AND LICENSE
 124
 125 Copyright 2007-2010 by Makamaka Hannyaharamitu
 126
 127 This library is free software; you can redistribute it and/or modify
 128 it under the same terms as Perl itself.
 129
 130 =cut
 131