Re: Bison Parser negate production rules

>> (here i want to write a block of statements or rules which will be
>>executed if B doesnt match to C/D/E.)


>>Now, the "modern" parsing methodologies like GLR, PEGs, and
>>predicated
>>grammars are closed under complement, so if you use a technique like
>>that, you can add a NOT rule and still create a parser.


> I'd appreciate some references.




With TextTransformer


http://www.texttransformer.com


you can write a look-ahead production


B ::= C|D|E


and then call it in another production like


IF(!B())
block of statements or rules
ELSE
produce an error or do something else
END


You can immediately try it in the TextTransformer interpreter.




Detlef

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