[idea] Re-startable "incremental" Spirit Parser Generator?

Hi Guys,

I just have a question: has there been thought put into creating a
re-startable "state-ful" parser? This type of parser is generally
useful in implementing an asynchronous parsing model -- i.e. in
network applications.

I've recently had to implement my own re-startable parser that is just
a whole big switch statement. I know there is a multi_pass_iterator,
but the read operation in the underlying stream actually blocks --
using that in a high performance / throughput environment doesn't
really make sense.

The solution I came up with was to have a separate protocol-specific
incremental parser, that then once it's parsed a chunk that has its
own structure, I then have a spirit-qi generated parser that deals
with the turning of the string into actual data structures.

It would be great if we were able to create function objects from
spirit parsers that had its own state and could deal with the semantic
actions as they come. A tribool would indicate whether the parsing is
done (true), in progress (indeterminate), or has failed (false).

Any insight into this would be greatly appreciated.

Have a good one everyone and I hope to hear your thoughts about this. :)

-- 
Dean Michael Berris
deanberris.com

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