On Tue, Jan 26, 2016 at 10:29 PM, Bram Moolenaar <b...@moolenaar.net> wrote:
>
> Yukihiro Nakadaira wrote:
>
> > :echo jsondecode('{"":"x"}')
> > E713: Cannot use empty key for Dictionary
> >
> > Will Vim allow empty key?
>
> Hmm, if you take the standard literally I suppose it allows for an empty
> key. In practice it's an indication something went wrong.
>
> Why are you asking, do you see a practical application for it?
>
I don't know practical example in JSON.
In Vim script, counting line is a possible example.
let d = {}
for line in getline(1, '$')
let d[line] = get(d, line, 0) + 1
endfor
for line in getline(1, '$')
if d[line] == 1
do something
else
do something
endif
endfor
Patience diff algorithm uses such a method, for example.
https://github.com/ynkdir/vim-diff/blob/master/autoload/diff/patience.vim
Although, there is a workaround like d['x'.line] = ...
> The standard also allows for duplicate names, even though in practice
> that doesn't work. So even though it's valid JSON, it doesn't mean it's
> a valid value after converting from JSON to Vim types.
>
> So the error is actually correct, it's not saying the JSON is invalid,
> it's saying the result in Vim types is invalid.
>
I see.
--
Yukihiro Nakadaira - yukihiro.nakada...@gmail.com
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