[antlr-interest] ANTLR Kudos...
Johannes Luber
jaluber at gmx.de
Fri Aug 15 05:14:40 PDT 2008
Ian Kaplan schrieb:
>
>
> /
> Performance is not bad with backtracking and memoization; linear
> time cost. Still better to let ANTLR predict with a simple DFA
> rather than backtracking. Also can set backtracking per rule./
>
>
>
> Only a part of my grammar requires more than two symbols of look
> a head. How do you turn on backtracking on a per rule basis? I've got
> it set globally and it may not need to be.
You can put an options block into a rule definition like so (didn't test
it, so syntax may be a bit off):
rule
options {
backtracking=true;
memoize=true;
}
: otherRule;
Johannes
>
> Thanks,
>
> Ian
>
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