how to know which rules are in process during parse

hi all.
I have made a boost::spirit parser for a language and it's quite lovely.
Excellent compile speed and robustness. (No X3 at the current time.)

Now I want to do a few advanced things for developers. Nice things like code
completion. So knowing which rule I am in and where in that rule would be
helpful to have good suggestions for code completion. 

Has anyone integrated this with boost::spirit? Could I 'piggyback' on the
debug support? It's a bit of a black box in the middle of parsing of course. 

Thank you for your assistance or any ideas. 

lucidbee



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