[antlr-interest] Re: Lexer problem

[manfredlotz]

--- In antlr-interest at y..., mzukowski at b... wrote:
> Yes try something like this:
> 
> ( ".a" | (".a.a")=>".a.a" | ".b" | 'a' | 'c' )
> 
> Read the docs and look at the generated code to understand what it
does.
> 
> Monty

Hi Monty,

Your suggestion was great. 

That did the trick. Now the lexer is able to scan a ".a.b" as well as
".a.a". 

I read the docs. My understanding is that the syntactic predicate
gives the lexer a way to backtrack if it is on a wrong path like after
".a." where there is no 'a' but a 'b'.


Best,
Manfred


 

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