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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2747) Deprecate/remove language-specific tokenizers in favor of StandardTokenizer
Date Wed, 10 Nov 2010 11:43:14 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12930580#action_12930580
] 

Robert Muir commented on LUCENE-2747:
-------------------------------------

bq. I meant o.a.l.analysis.core. I'd expect the premier analyzers to be in core.

I guess the package doesn't make a big difference to me, all the analyzers are in one place
and the same.
its true we mixed the "core" analysis stuff with contrib and solr, but if there are warts
with the contrib stuff,
we should be able to clean it up (I think this has been happening)

bq. I guess I meant: Shouldn't the SimpleAnalyzer just be constructed the same as StandardAnalyzer
with the addition of a Filter that pitch tokens that are not needed?

I don't think so, this seems like a trap. Lots of people use StandardTokenizer without any
filter... I don't think 
it should emit trash (punctuation). if you want to do the other stuff, you can use ClassicTokenizer,
or even 
WhitespaceTokenizer and filter to your heart's content.


> Deprecate/remove language-specific tokenizers in favor of StandardTokenizer
> ---------------------------------------------------------------------------
>
>                 Key: LUCENE-2747
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2747
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Analysis
>    Affects Versions: 3.1, 4.0
>            Reporter: Steven Rowe
>             Fix For: 3.1, 4.0
>
>         Attachments: LUCENE-2747.patch, LUCENE-2747.patch
>
>
> As of Lucene 3.1, StandardTokenizer implements UAX#29 word boundary rules to provide
language-neutral tokenization.  Lucene contains several language-specific tokenizers that
should be replaced by UAX#29-based StandardTokenizer (deprecated in 3.1 and removed in 4.0).
 The language-specific *analyzers*, by contrast, should remain, because they contain language-specific
post-tokenization filters.  The language-specific analyzers should switch to StandardTokenizer
in 3.1.
> Some usages of language-specific tokenizers will need additional work beyond just replacing
the tokenizer in the language-specific analyzer.  
> For example, PersianAnalyzer currently uses ArabicLetterTokenizer, and depends on the
fact that this tokenizer breaks tokens on the ZWNJ character (zero-width non-joiner; U+200C),
but in the UAX#29 word boundary rules, ZWNJ is not a word boundary.  Robert Muir has suggested
using a char filter converting ZWNJ to spaces prior to StandardTokenizer in the converted
PersianAnalyzer.

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