Supporting multiple input syntaxes

I've got my project successfully parsing the circa-1975 C syntax
from that old manual. I'd like to add parsers for K&R1 and c90
syntaxes.


How separate should these be? Should they be complete
separate grammars, or more piecewise selection?


My feeling is that separating them will be less headache, but maybe
there's some advantage to changing out smaller pieces of the grammar
in that it might be easier to make sure that they produce the same
structure compatible with the backend.


Any guidance in this area?


https://github.com/luser-dr00g/pcomb/blob/master/pc9syn.c


[Really, it's up to you. My inclination would be to make them
separate but use some sort of macro setup so you can insert
common pieces into each of the grammars. -John]

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