add icu-based tokenizer for unicode text segmentation
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Key: LUCENE-2414
URL: https://issues.apache.org/jira/browse/LUCENE-2414
Project: Lucene - Java
Issue Type: New Feature
Components: contrib/*
Affects Versions: 3.1
Reporter: Robert Muir
Fix For: 3.1
I pulled out the last part of LUCENE-1488, the tokenizer itself and cleaned it
up some.
The idea is simple:
* First step is to divide text into writing system boundaries (scripts)
* You supply an ICUTokenizerConfig (or just use the default) which lets you
tailor segmentation on a per-writing system basis.
* This tailoring can be any BreakIterator, so rule-based or dictionary-based or
your own.
The default implementation (if you do not customize) is just to do UAX#29, but
with tailorings for stuff with no clear word division:
* Thai (uses dictionary-based word breaking)
* Khmer, Myanmar, Lao (uses custom rules for syllabification)
Additionally as more of an example i have a tailoring for hebrew that treats
the punctuation special. (People have asked before
for ways to make standardanalyzer treat dashes differently, etc)
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