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Posted to dev@lucene.apache.org by "Jack Conradson (JIRA)" <ji...@apache.org> on 2015/04/11 03:54:12 UTC

[jira] [Created] (LUCENE-6417) Upgrade ANTLR to version 4.5

Jack Conradson created LUCENE-6417:
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             Summary: 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


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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