4 use warnings FATAL => 'all';
7 our $VERSION = '1.002004';
9 sub _choose_json_module {
10 return 'Cpanel::JSON::XS' if $INC{'Cpanel/JSON/XS.pm'};
11 return 'JSON::XS' if $INC{'JSON/XS.pm'};
15 return 'Cpanel::JSON::XS' if eval { require Cpanel::JSON::XS; 1; };
16 push @err, "Error loading Cpanel::JSON::XS: $@";
18 return 'JSON::XS' if eval { require JSON::XS; 1; };
19 push @err, "Error loading JSON::XS: $@";
21 return 'JSON::PP' if eval { require JSON::PP; 1 };
22 push @err, "Error loading JSON::PP: $@";
24 die join( "\n", "Couldn't load a JSON module:", @err );
29 our $JSON_Class = _choose_json_module();
30 $JSON_Class->import(qw(encode_json decode_json));
33 our @EXPORT = qw(encode_json decode_json JSON);
34 our @EXPORT_OK = qw(is_bool);
35 our %EXPORT_TAGS = ( all => [ @EXPORT, @EXPORT_OK ] );
37 sub JSON () { our $JSON_Class }
41 my %args = @_ == 1 ? %{$_[0]} : @_;
42 my $new = (our $JSON_Class)->new;
43 $new->$_($args{$_}) for keys %args;
50 die 'is_bool is not a method' if $_[1];
52 $_[0]->$_isa('JSON::XS::Boolean')
53 or $_[0]->$_isa('JSON::PP::Boolean');
60 JSON::MaybeXS - Use L<Cpanel::JSON::XS> with a fallback to L<JSON::XS> and L<JSON::PP>
66 my $data_structure = decode_json($json_input);
68 my $json_output = encode_json($data_structure);
72 my $json_with_args = JSON::MaybeXS->new(utf8 => 1); # or { utf8 => 1 }
76 This module first checks to see if either L<Cpanel::JSON::XS> or
77 L<JSON::XS> is already loaded, in which case it uses that module. Otherwise
78 it tries to load L<Cpanel::JSON::XS>, then L<JSON::XS>, then L<JSON::PP>
79 in order, and either uses the first module it finds or throws an error.
81 It then exports the C<encode_json> and C<decode_json> functions from the
82 loaded module, along with a C<JSON> constant that returns the class name
83 for calling C<new> on.
85 If you're writing fresh code rather than replacing L<JSON.pm|JSON> usage, you might
86 want to pass options as constructor args rather than calling mutators, so
87 we provide our own C<new> method that supports that.
91 C<encode_json>, C<decode_json> and C<JSON> are exported by default; C<is_bool>
92 is exported on request.
94 To import only some symbols, specify them on the C<use> line:
96 use JSON::MaybeXS qw(encode_json decode_json is_bool); # functions only
98 use JSON::MaybeXS qw(JSON); # JSON constant only
100 To import all available symbols, use C<:all>:
102 use JSON::MaybeXS ':all';
106 This is the C<encode_json> function provided by the selected implementation
107 module, and takes a perl data structure which is serialised to JSON text.
109 my $json_text = encode_json($data_structure);
113 This is the C<decode_json> function provided by the selected implementation
114 module, and takes a string of JSON text to deserialise to a perl data structure.
116 my $data_structure = decode_json($json_text);
120 The C<JSON> constant returns the selected implementation module's name for
121 use as a class name - so:
123 my $json_obj = JSON->new; # returns a Cpanel::JSON::XS or JSON::PP object
125 and that object can then be used normally:
127 my $data_structure = $json_obj->decode($json_text); # etc.
131 $is_boolean = is_bool($scalar)
133 Returns true if the passed scalar represents either C<true> or
134 C<false>, two constants that act like C<1> and C<0>, respectively
135 and are used to represent JSON C<true> and C<false> values in Perl.
137 Since this is a bare sub in the various backend classes, it cannot be called as
138 a class method like the other interfaces; it must be called as a function, with
139 no invocant. It supports the representation used in all JSON backends.
145 With L<JSON::PP>, L<JSON::XS> and L<Cpanel::JSON::XS> you are required to call
146 mutators to set options, such as:
148 my $json = $class->new->utf8(1)->pretty(1);
150 Since this is a trifle irritating and noticeably un-perlish, we also offer:
152 my $json = JSON::MaybeXS->new(utf8 => 1, pretty => 1);
154 which works equivalently to the above (and in the usual tradition will accept
155 a hashref instead of a hash, should you so desire).
159 To include JSON-aware booleans (C<true>, C<false>) in your data, just do:
162 my $true = JSON->true;
163 my $false = JSON->false;
167 mst - Matt S. Trout (cpan:MSTROUT) <mst@shadowcat.co.uk>
173 =item * Clinton Gormley <drtech@cpan.org>
175 =item * Karen Etheridge <ether@cpan.org>
181 Copyright (c) 2013 the C<JSON::MaybeXS> L</AUTHOR> and L</CONTRIBUTORS>
186 This library is free software and may be distributed under the same terms