Re: : in the flow context for PyYAML and SnakeYAML

On 08/25/2010 11:29 PM, William Spitzak wrote:
> Kirill Simonov wrote:
>> On 08/25/2010 10:12 PM, William Spitzak wrote:
>>> Kirill Simonov wrote:
>>>
>>>> By unquoted JSON, do you mean something like:
>>>>       {foo:"bar"}
>>>
>>> Yes, though
>>>      {foo: "bar"}
>>> is probably a better example (note the space!)
>>>
>>>> This is definitely not a valid JSON and I'm certain most of the JSON
>>>> parsers will fail to parse it.
>>>
>>> However there are a lot of pseudo-JSON parsers that *do* parse it,
>>> including libyaml itself!
>>
>> A lot? Other than Javascript eval(), I'm not aware of any parser library
>> that could parse it.  Python's standard json.py module certainly cannot
>> do it.  Could you name some of the parsers, please?
>
> libyaml!

And that's it?  Hardly a lot.

>
>>>      {foo:http:baz: zoo}
>>>
>>> would be interpreted as:
>>>
>>>      {"foo" : "http:baz: zoo")
>   >
>> I see two problems with this definition.
>>
>> First, it complicates the YAML grammar even further by creating 3
>> similar, but subtly different plain scalar styles.  The YAML grammar is
>> already complex enough, I'd prefer not to have it even more complex.
>
> Fair enough.
>
>> Second, it creates an ambiguity in the case:
>>          [foo:bar] (or even [foo: bar])
>> which could be interpreted as
>>      ["foo:bar"]
>> or as
>>      [{"foo": "bar"}]
>> depending on whether you consider `foo: bar` a single value or a key:
>> value pair.
>
> A quick check shows that libyaml already accepts [foo: bar] and
> interprets it as [{"foo": "bar"}] so this problem already exists and my
> change would do nothing to make this harder or easier.

The problem is that according to your proposal, this should be 
interpreted as ["foo: bar"] instead.


Thanks,
Kirill

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