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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2747) Deprecate/remove language-specific tokenizers in favor of StandardTokenizer
Date Mon, 08 Nov 2010 20:58:07 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2747?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Muir updated LUCENE-2747:
--------------------------------

    Attachment: LUCENE-2747.patch

here's a quick stab at a patch.

I had to add at least minimal support to ReusableAnalyzerBase in case you want charfilters,
since it doesn't have any today.

maybe there is a better way to do it though.


> 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
>
>
> 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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