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https://issues.apache.org/jira/browse/LUCENE-6874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14985704#comment-14985704
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David Smiley commented on LUCENE-6874:
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Uwe,
I beg to differ on WDF but I think we can put that behind us. It's great to
see a solution come together on using ICU's rules :-)
For something as trivial as detecting if the character is in a set, do we
really need to depend on ICU? It would be so nice to not need it, even if it's
internal implementation seems fast. Then we could consider deprecating
WhitespaceTokenizer since, after all, why would one use it when
ICUWhitespaceTokenizer exists? Anyone wanting atypical tokenization could
easily subclass CharTokenizer or consider a MappingCharFilter.
> WhitespaceTokenizer should tokenize on NBSP
> -------------------------------------------
>
> Key: LUCENE-6874
> URL: https://issues.apache.org/jira/browse/LUCENE-6874
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/analysis
> Reporter: David Smiley
> Priority: Minor
> Attachments: LUCENE-6874.patch
>
>
> WhitespaceTokenizer uses [Character.isWhitespace
> |http://docs.oracle.com/javase/8/docs/api/java/lang/Character.html#isWhitespace-int-]
> to decide what is whitespace. Here's a pertinent excerpt:
> bq. It is a Unicode space character (SPACE_SEPARATOR, LINE_SEPARATOR, or
> PARAGRAPH_SEPARATOR) but is not also a non-breaking space ('\u00A0',
> '\u2007', '\u202F')
> Perhaps Character.isWhitespace should have been called
> isLineBreakableWhitespace?
> I think WhitespaceTokenizer should tokenize on this. I am aware it's easy to
> work around but why leave this trap in by default?
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