yacc w/ coroutines (reentrant parser)?

I have a situation where I would like to parse a file incrementally in
semantic chunks interspersed with processing. It would be a ton of
work to rework things so that the processing could take place as
callbacks from within the parser. Ideally, I would implement the
parser as a coroutine, but this is C++ and a yacc generated parser.
Does anyone know of any tricks to do this sort of thing?

[You might try one of the many software threads packages lying around, one of
them might do the trick. -John]

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