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From "Robert Muir (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-1702) Thai token type() bug
Date Fri, 19 Jun 2009 15:34:07 GMT
Thai token type() bug
---------------------

                 Key: LUCENE-1702
                 URL: https://issues.apache.org/jira/browse/LUCENE-1702
             Project: Lucene - Java
          Issue Type: Bug
          Components: contrib/analyzers
            Reporter: Robert Muir
            Priority: Minor


While adding tests for offsets & type to ThaiAnalyzer, i discovered it does not type Thai
numeric digits correctly.
ThaiAnalyzer uses StandardTokenizer, and this is really an issue with the grammar, which adds
the entire [:Thai:] block to ALPHANUM.

i propose that alphanum be described a little bit differently in the grammar.
Instead, [:letter:] should be allowed to have diacritics/signs/combining marks attached to
it.

this would allow the [:thai:] hack to be completely removed, would allow StandardTokenizer
to parse complex writing systems such as Indian languages, and would fix LUCENE-1545.


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