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From "Robert Muir (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3820) Wrong trailing index calculation in PatternReplaceCharFilter
Date Thu, 23 Feb 2012 11:23:48 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214554#comment-13214554
] 

Robert Muir commented on LUCENE-3820:
-------------------------------------

{quote}
I'll go back to this later today, but I can tell you right now that from my paper considerations
negative indexes make logical sense
{quote}

We cannot do this... this is the offset (character position in the reader). 

Offsets can never be negative.
                
> 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
>
>         Attachments: LUCENE-3820.patch, LUCENE-3820.patch, LUCENE-3820_test.patch, LUCENE-3820_test.patch
>
>
> 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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