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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2906) Filter to process output of ICUTokenizer and create overlapping bigrams for CJK
Date Sun, 06 Feb 2011 13:31:30 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2906?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Robert Muir updated LUCENE-2906:
--------------------------------

    Attachment: LUCENE-2906.patch

here's a patch going in a slightly different direction (though we can still add some special
icu-only stuff here).

instead the patch synchronizes the token types of ICUTokenizer with StandardTokenizer, adds
the necessarily types to both, and then adds the bigramming logic to standardfilter.

this way, cjk works easily "out of box", for all of unicode (e.g. supplementaries) and plays
well with other languages. i deprecated cjktokenizer in the patch and pulled out its special
full-width filter into a separate tokenfilter.


> Filter to process output of ICUTokenizer and create overlapping bigrams for CJK 
> --------------------------------------------------------------------------------
>
>                 Key: LUCENE-2906
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2906
>             Project: Lucene - Java
>          Issue Type: New Feature
>          Components: Analysis
>            Reporter: Tom Burton-West
>            Priority: Minor
>         Attachments: LUCENE-2906.patch
>
>
> The ICUTokenizer produces unigrams for CJK. We would like to use the ICUTokenizer but
have overlapping bigrams created for CJK as in the CJK Analyzer.  This filter would take the
output of the ICUtokenizer, read the ScriptAttribute and for selected scripts (Han, Kana),
would produce overlapping bigrams.

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