[x3d-public] How to tell if a file is JSON

[John Carlson]

There might be a comment before the first x3d object.
On Nov 23, 2015 5:19 PM, "John Carlson" <yottzumm at gmail.com> wrote:

> I wonder if we should develop a X3D JSON parser which shows streaming
> parsing of X3D JSON for large files.  Getting a large file which our
> current tools don't support would be a good idea.
> On Nov 23, 2015 5:11 PM, "John Carlson" <yottzumm at gmail.com> wrote:
>
>> Don is correct from my reading.  Another thing you can do is parse the
>> JSON, then insure the first *object* has an "X3D" key.  Good luck!
>> On Nov 23, 2015 5:04 PM, "Don Brutzman" <brutzman at nps.edu> wrote:
>>
>>> On 11/20/2015 11:37 AM, Roy Walmsley wrote:
>>>
>>>> Hi Don and John,
>>>>
>>>> Sounds like you are making excellent progress on JSON.
>>>>
>>>
>>> thanks.  updated the description page today, not many TODO items left.
>>>
>>>         http://www.web3d.org/x3d/stylesheets/X3dToJson.html
>>>
>>> So, I am just thinking ahead, to maybe one day getting JSON to load
>>>> directly into my C++ Viewer. I am thinking of a loader, and asking myself
>>>> the following question:
>>>>
>>>> Apart from the .json file extension, is there any other definitive way
>>>> of determining that this is, or is not, a JSON X3D file. I am looking at
>>>> your HelloWorld.json example, and seeing the text
>>>>
>>>>                                  { “X3D”: {
>>>>
>>>> on the first line. So, I’m thinking that the initial test that it is a
>>>> JSON X3D file goes as follows:
>>>>
>>>> 1)Is the first character a left brace?
>>>>
>>>> 2)Ignoring white space, is the next token the quoted string “X3D”?
>>>>
>>>> 3)Ignoring white space, is the next token a colon?
>>>>
>>>> 4)Ignoring white space, is the next token a left brace?
>>>>
>>>
>>> yes to all
>>>
>>> That is the equivalent of reading the header line. By the way, is it
>>>> permitted to have white space before the first left brace?
>>>>
>>>
>>> yes
>>>
>>> i went ahead and experimented with the Netbeans plugin JS CSS Minify
>>> Compress, available via Netbeans/X3D-Edit Tools/Plugins menu and described
>>> at
>>>
>>>         http://plugins.netbeans.org/plugin/49666/js-css-minify-compress
>>>
>>> this also showed that getting rid of all intermediate whitespace was OK.
>>>
>>> I guess  I just want to know that my thinking is not incorrect – double
>>>> negative intended.
>>>>
>>>
>>> no response   :)
>>>
>>> all the best, Don
>>> --
>>> Don Brutzman  Naval Postgraduate School, Code USW/Br
>>> brutzman at nps.edu
>>> Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA
>>> +1.831.656.2149
>>> X3D graphics, virtual worlds, navy robotics
>>> http://faculty.nps.edu/brutzman
>>>
>>
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