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https://issues.apache.org/jira/browse/LUCENE-1406?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Grant Ingersoll reassigned LUCENE-1406:
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Assignee: Grant Ingersoll
> new Arabic Analyzer (Apache license)
> ------------------------------------
>
> Key: LUCENE-1406
> URL: https://issues.apache.org/jira/browse/LUCENE-1406
> Project: Lucene - Java
> Issue Type: New Feature
> Components: Analysis
> Reporter: Robert Muir
> Assignee: Grant Ingersoll
> Priority: Minor
> Attachments: arabic.zip
>
>
> I've noticed there is no Arabic analyzer for Lucene, most likely because Tim
> Buckwalter's morphological dictionary is GPL.
> However, it is not necessary to have full morphological analysis engine for
> a quality arabic search.
> This implementation implements the light-8s algorithm present in the
> following paper: http://ciir.cs.umass.edu/pubfiles/ir-249.pdf
> As you can see from the paper, improvement via this method over searching
> surface forms (as lucene currently does) is significant, with almost 100%
> improvement in average precision.
> While I personally don't think all the choices were the best, and some easily
> improvements are still possible, the major motivation for implementing it
> exactly the way it is presented in the paper is that the algorithm is
> TREC-tested, so the precision/recall improvements to lucene are already
> documented.
> For a stopword list, I used a list present at
> http://members.unine.ch/jacques.savoy/clef/index.html simply because the
> creator of this list documents the data as BSD-licensed.
> This implementation (Analyzer) consists of above mentioned stopword list plus
> two filters:
> ArabicNormalizationFilter: performs orthographic normalization (such as
> hamza seated on alif, alif maksura, teh marbuta, removal of harakat, tatweel,
> etc)
> ArabicStemFilter: performs arabic light stemming
> Both filters operate directly on termbuffer for maximum performance. There is
> no object creation in this Analyzer.
> There are no external dependencies. I've indexed about half a billion words
> of arabic text and tested against that.
> If there are any issues with this implementation I am willing to fix them. I
> use lucene on a daily basis and would like to give something back. Thanks.
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