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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1689) supplementary character handling
Date Fri, 12 Jun 2009 18:56:07 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12718938#action_12718938
] 

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

my example has some "issues" (i.e. it depends upon the knowledge that no surrogate pairs lowercase
to BMP codepoints).
it also doesn't correctly handle invalid unicode data (unpaired surrogates).

Such complexity can be all added to the slower-path supplementary case. the intent is just
to show it wouldnt be a terribly invasive change.
Thanks!

> 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
>         Attachments: LUCENE-1689_lowercase_example.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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