Allow json to decode streamed data / async json parser

[darronschall]

Originally filed by marko.kocic on 2009-02-12T16:03:24

It would be a great addition to json library if it could be used to decode
String stream. It is usefull when you are reading a sockes and parsing its
content on the fly.

I slightly modified JSONDecoder and JSONTokenizer (made some vars public)
and addet new classes JSonFlow and JSonDataEvent. JSonFlow can take partial
json strings in its feedIt method. Then it parses the string and generates
events whenever it parses some object.

It basically works, but I still didn't figure out the best way to handle
errors. Currently, if ParseError is catched, it just aborts and waits for
new feed of data, assuming it failed because of incomplete input. Real
error handling would probably raquire more changer to Tokenizer.

Are you interesting in cleaning this up and adding to the one of the
following releases?

Regards,
Marko Kocić

Attached 2 files.

[darronschall]

Updated by darron.schall on 2009-07-08T19:08:33

Hi Marko,

This is definitely something to consider. Other people have requested this type of functionality. See this
question on stack overflow: http://stackoverflow.com/questions/869780/streaming-parsers-json-xml-for-
as3-flex-adobe-air-application

I'm not sure of the best approach right now, but I'll take a look at this patch as well as the answer to the
question on stack overflow and see if this warrants building support directly into the API, or if it just needs an
example added on the wiki about how to use this library when trying to read potentially incomplete data.

Added label Type-Patch

[darronschall]

Updated by marko.kocic on 2009-07-09T10:28:56

Hi,

I'm attaching the slightly improved version of the patch that was used in my
application. I know it is not ideal, since my goal was to modify as little as
possible upstream code.

I think that some support for streaming will be useful, especialy since it can be
localized to separate class without affecting existing code.