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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1689) supplementary character handling
Date Sat, 08 Aug 2009 13:28:14 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12740896#action_12740896
] 

Robert Muir commented on LUCENE-1689:
-------------------------------------

Michael, I do think that would be the simplest, but most invasive (we would have to make new
duplicate classes for Arabic & Russian even!) 
i think i will try to create a patch for my 2nd method, and if it cannot be made simple, we
can always do the new class/deprecation route?


> supplementary character handling
> --------------------------------
>
>                 Key: LUCENE-1689
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1689
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Robert Muir
>            Priority: Minor
>             Fix For: 3.1
>
>         Attachments: LUCENE-1689.patch, LUCENE-1689_lowercase_example.txt, testCurrentBehavior.txt
>
>
> for Java 5. Java 5 is based on unicode 4, which means variable-width encoding.
> supplementary character support should be fixed for code that works with char/char[]
> For example:
> StandardAnalyzer, SimpleAnalyzer, StopAnalyzer, etc should at least be changed so they
don't actually remove suppl characters, or modified to look for surrogates and behave correctly.
> LowercaseFilter should be modified to lowercase suppl. characters correctly.
> CharTokenizer should either be deprecated or changed so that isTokenChar() and normalize()
use int.
> in all of these cases code should remain optimized for the BMP case, and suppl characters
should be the exception, but still work.

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