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Re: make duplicate JSON keys an error

by vsespb (Hermit)
on Oct 24, 2013 at 17:22 UTC ( #1059521=note: print w/ replies, xml ) Need Help??

in reply to make duplicate JSON keys an error

You could try to write code (perhaps, a single regexp) which will prepend prefix to all keys in JSON string

{ "1_op": "add", "2_path": "/baz", "3_value": "qux", "4_op": "remove" + }

You don't even have to check if this string is a key (it's ok to damage values)
next, parse with JSON module, and when you find "1_op" and "4_op" in same hash - that would mean error.
Alpha version:
use strict; use warnings; use JSON::XS; use Data::Dumper; my $s = <<"END"; [ { "op": "add", "path": "/baz", "value": "qux", "op": "remove" } ] END my $x = 1; $s =~ s/\"([^\"]+)\"/"\"".++$x."_".$1."\""/ge; my $j = JSON::XS->new()->filter_json_object(sub { my %seen; for (keys %{shift()}) { die unless /^\d+\_(.*)$/; die "key [$1] already seen" if $seen{$1}++; } }); $j->decode($s);
key [op] already seen
You can even avoid double-parsing, just remove prepended numbers in filter_json_object and return correct data. In the end yo'll get correct hash on first pass.

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