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https://issues.apache.org/jira/browse/LUCENE-6417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14654604#comment-14654604
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Jack Conradson commented on LUCENE-6417:
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[~rcmuir] then maybe the best solution is to drop the visitor and parse the
tree as before? As a possible third option, I checked to see if it was
possible to easily modify the string template files used to generate the code
from the grammars, but there's no easy way to point to a custom one. We might
be able to still do this, but it would either be through some fragile classes
that I don't anticipate were meant to be overridden or by injecting a custom
template file into a copied version of the antler 4 jar -- definitely not a
pretty solution.
> Upgrade ANTLR to version 4.5
> ----------------------------
>
> Key: LUCENE-6417
> URL: https://issues.apache.org/jira/browse/LUCENE-6417
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Jack Conradson
> Assignee: Uwe Schindler
> Attachments: LUCENE-6471.patch, LUCENE-6471.patch, LUCENE-6471.patch
>
>
> I would like to upgrade ANTLR from 3.5 to 4.5. This version adds several
> features that will improve the existing grammars. The main improvement would
> be the allowance of left-hand recursion in grammar rules which will reduce
> the number of rules significantly for expressions.
> This change will require some code refactoring to the existing expressions
> work.
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