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https://issues.apache.org/jira/browse/LUCENE-1689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12719158#action_12719158
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Robert Muir commented on LUCENE-1689:
-------------------------------------
i forgot to answer your question Michael:
it depends upon the knowledge that no surrogate pairs lowercase to BMP
codepoints
Is it invalid to make this assumption? Ie, does the unicode standard not
guarantee it?
I do not think it guarantees this for all future unicode versions. In my
opinion, we should exploit things like this if I can show a test case that
proves its true for all codepoint in the current version of unicode :)
And it should be documented that this could possibly change in some future
version.
In this example, its a nice simplification because it guarantees the length (in
code units) will not change!
I think for a next step on this issue I will create and upload a test case
showing the issues and detailing some possible solutions.
For some of them, maybe a javadoc update is the most appropriate, but for
others, maybe an API change is the right way to go.
Then we can figure out what should be done.
> 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: 2.9
>
> 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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