Hi Jochen,
The groovy grammar bases on Java7
grammar(https://github.com/antlr/grammars-v4/blob/master/java/Java.g4) at
the beginning because I noticed the comment of Java8 grammar, which tells us
Java7 has better performance.
In addition, I refine the cache management of antlr4, so the memory
will not grow forever and use the cache as far as it can. I find that about
20% time saved after the work done.
Cheers,
Daniel.Sun
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