On 24 January 2016, Bram Moolenaar <b...@moolenaar.net> wrote:
>
> Lcd wrote:
[...]
> > Actually, since you added two more values for type(), it would
> > make sense to make Bool and Null standard types, Vim citizens with
> > full rights. But some careful consideration would be needed for the
> > interaction with the other types, so that they can also be used for
> > other purposes, unrelated to JSON.
>
> The thing is that the only valid values are what we have now. Giving
> those types a name doesn't really help.
>
> > The alternative would be to make jsondecode() return only
> > standard Vim values (that is, true --> 1, false --> 0, null --> ''),
> > and leave v:<special> only for encoding. Less powerful, but a lot
> > simpler, and a lot more robust.
>
> Then you can't tell the difference between decoding a zero or "false".
> This drops information that might be important. I'm sure this will be
> a problem at a later time.
Yes, but now we have the worst of the two worlds: types that aren't
quite types, and values that aren't quite values. They'll break things
eventually. Actually, Nikolai Aleksandrovich Pavlov has a few examples
when they do. F.i. eval(string(var)) is no longer guaranteed to be the
same as var.
[...]
> > This is still somewhat inconsistent:
> >
> > :echo jsondecode('{"a":}')
> > E474: Invalid argument
> > {'a': none}
> >
> > A better way to deal with this might be to find a JSON linter /
> > validator / pretty printer with tests, and run said tests in Vim.
>
> We can easily add more JSON examples in the test_json.vim test.
[...]
My point is not that there aren't enough tests. What I'm saying
is that Vim doesn't do proper validation, and it doesn't return a
well-defined condition when it finds errors. Basically the behaviour of
jsondecode(val) is undefined if val is not valid JSON, and in most cases
that isn't useful.
/lcd
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