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From "Dawid Weiss (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-3820) Wrong trailing index calculation in PatternReplaceCharFilter
Date Thu, 23 Feb 2012 02:03:48 GMT
Wrong trailing index calculation in PatternReplaceCharFilter
------------------------------------------------------------

                 Key: LUCENE-3820
                 URL: https://issues.apache.org/jira/browse/LUCENE-3820
             Project: Lucene - Java
          Issue Type: Bug
            Reporter: Dawid Weiss
            Assignee: Dawid Weiss
            Priority: Minor
             Fix For: 4.0


I need to use PatternReplaceCharFilter's index corrections directly and it fails for me --
the trailing index is not mapped correctly for a pattern "\\.[\\s]*" and replacement ".",
input "A. .B.".

I tried to understand the logic in getReplaceBlock but I eventually failed and simply rewrote
it from scratch. After my changes a few tests don't pass but I don't know if it's the tests
that are screwed up or my logic. In essence, the difference between the previous implementation
and my implementation is how indexes are mapped for shorter replacements. I shift indexes
of shorter regions to the "right" of the original index pool and the previous patch seems
to squeeze them to the left (don't know why though).

If anybody remembers how it's supposed to work, feel free to correct me?

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