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Nov 25, 2009, 1:54 PM
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[jira] Issue Comment Edited: (LUCENE-2069) fix LowerCaseFilter for unicode 4.0
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[ https://issues.apache.org/jira/browse/LUCENE-2069?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12782637#action_12782637 ]
Simon Willnauer edited comment on LUCENE-2069 at 11/25/09 9:54 PM:
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bq. damn we have to use the limit form of codePointAt, just to be sure.
no we don't - at least not in this particular case
bq. if term text truly ends with unpaired lead surrogate, codePointAt could pair it with leftover trash trail surrogate from a previous token...
if this rare situation occurs the term length will still prevent the changed trail surrogate from being part of the token. This includes a super tiny overhead but I guess we can simply ignore this. The lead surrogate will not be changed at all in this case - if there is a situation where this could happen I'm not aware of it!
was (Author: simonw):
bq. damn we have to use the limit form of codePointAt, just to be sure.
no we don't - at least not in this particular case
bq. if term text truly ends with unpaired lead surrogate, codePointAt could pair it with leftover trash trail surrogate from a previous token...
if this rare situation occurs the term length will still prevent the changed trail surrogate from being part of the token. This includes a super tiny overhead but I guess we can simply ignore this.
> fix LowerCaseFilter for unicode 4.0
> -----------------------------------
>
> Key: LUCENE-2069
> URL: https://issues.apache.org/jira/browse/LUCENE-2069
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Analysis
> Reporter: Robert Muir
> Assignee: Robert Muir
> Priority: Minor
> Fix For: 3.1
>
> Attachments: LUCENE-2069.patch, LUCENE-2069.patch, LUCENE-2069.patch, LUCENE-2069.patch, LUCENE-2069.patch
>
>
> lowercase suppl. characters correctly.
> this only fixes the filter, the LowerCaseTokenizer is part of a more complex issue (CharTokenizer)
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