RFC 6901 (JSON Pointer) support

[erosb]

What do you think about adding JSON Pointer support to the library?

From the API point of view I think it would mean a new method with a signature like Object query(String jsonPointer), both in JSONObject and JSONArray.

@stleary if you give green light for this proposal then I may work on it.

[johnjaylward]

is this like XML Path but for JSON?

[erosb]

Exactly (and simpler too).

[stleary]

Torn between liking the idea and thinking maybe it is not part of the purpose of the lib. Hard to decide because I am not familiar with it - I use JsonPath in the unit tests. JsonPointer does not seem to have wildcards. Is this the case?

[erosb]

I've never used JsonPath, but it doesn't seem to be a standard, so I would still prefer implementing JSON Pointer. JsonPath also seems to be a more complex language, deserving its own library, while a JSON Pointer implementation would be small-enough to fit into only a few methods in this project.

[stleary]

Please proceed with JSON Pointer if you are still interested. Let's see what it would look like.

[stleary]

Please see #222

[erosb]

@stleary will youl merge #222 ?

[stleary]

@erosb I expect so. The implementation looks good so far. Have not had a chance to go over the unit test cases or coverage yet.