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.