splitting grammars in LL / LR / Backtrack / ...

I wonder if it is possible to split a grammar into seperately parsable
parts to 'isolate' the parts that are not parsable with an LL(1) or
LR(1) parser. This way, a parse-function could parse a grammar mainly
using a cheap parsing strategy and call more general (=expensive)
parse-functions only for those parts that need the more general
techniques. Are there any tools for this?


I know that several tools generate C or C++ functions that parse a
part of a grammar and that different tools use different parse
strategies, but probably functions generated by different tools are
hard to combine. Does anyone know more about this? Or are there any
helpful links to pages/articles/books?


Thanks in advance,
Mic


        M.J. Koens Philips Research Laboratories
        Phone: +31-40-2742026 E-mail: koens@natlab.research.philips.com
[Sounds intractable to me. -John]


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