NAME

JSON::MultiValueOrdered - handle JSON like {"a":1, "a":2}

SYNOPSIS

use Test::More tests => 4;
use JSON::MultiValueOrdered;

my $j = JSON::MultiValueOrdered->new;
isa_ok $j, 'JSON::Tiny';

my $data = $j->decode(<<'JSON');
{
   "a": 1,
   "b": 2,
   "a": 3,
   "b": 4
}
JSON

# As you'd expect, for repeated values, the last value is used
is_deeply(
   $data,
   { a => 3, b => 4 },
 );

# But hashes within the structure are tied to Tie::Hash::MultiValueOrdered
is_deeply(
   [ tied(%$data)->get('b') ],
   [ 2, 4 ],
 );

# And the extra information from the tied hash is used when re-encoding
is(
   $j->encode($data),
   q({"a":1,"b":2,"a":3,"b":4}),
);

done_testing;

DESCRIPTION

The JSON specification allows keys to be repeated within objects. It remains silent on how repeated keys should be interpreted. Most JSON implementations end up choosing just one of the values; sometimes the first, sometimes the last.

JSON::MultiValueOrdered is a subclass of JSON::Tiny which treats objects as ordered lists of key-value pairs, with duplicate keys allowed. It achieves this by returning all hashes as tied using Tie::Hash::MultiValueOrdered. While these hashes behave like standard Perl hashes (albeit while preserving the original order of the keys), they provide a tied object interface allowing you to retrieve additional values for each key.

JSON::MultiValueOrdered serialisation also serialises these additional values and preserves order.

JSON::MultiValueOrdered is a subclass of JSON::Tiny::Subclassable and JSON::Tiny, which is itself a fork of Mojo::JSON. Except where noted, the methods listed below behave identically to the methods of the same names in the superclasses.

Constructor

new(%attributes)

Attributes

pretty

error

Methods

decode($bytes)

encode($ref)

false

true

Functions

j(\@array) / j(\%hash) / j($bytes)

Encode or decode JSON as applicable.

This function may be exported, but is not exported by default. You may request to import it with a different name:

use JSON::MultiValueOrdered j => { -as => 'quick_json' };

BUGS

Please report any bugs to http://rt.cpan.org/Dist/Display.html?Queue=JSON-MultiValueOrdered.

SEE ALSO

JSON::Tiny::Subclassable, JSON::Tiny, Mojo::JSON.

Tie::Hash::MultiValueOrdered.

AUTHOR

Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENCE

This software is copyright (c) 2012-2013 by Toby Inkster.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

DISCLAIMER OF WARRANTIES

THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.