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https://issues.apache.org/jira/browse/LUCENE-2167?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steven Rowe updated LUCENE-2167:
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Attachment: LUCENE-2167.patch
Attached patch includes a Perl script to generate a test based on Unicode.org's
WordBreakTest.txt UAX#29 test sequences, along with the java source generated
by the Perl script. Both UAX29Tokenizer and StandardTokenizerImpl are tested,
and all Lucene and Solr tests pass. I added a note to
modules/analyzer/NOTICE.txt about the Unicode.org data files used in creating
the test class.
This test suite turned up a problem in both tested grammars: the WORD_TYPE rule
could match zero characters, and so was in certain cases involving underscores
returning a zero-length token instead of end-of-stream. I fixed the issue by
changing the rule in both grammars to require at least one character for a
match to succeed. All test sequences are now successfully tokenized.
I attempted to also test ICUAnalyzer, but since it downcases, the expected
tokens are incorrect in some cases. I didn't pursue it further.
I ran the best-of-25-rounds/20k docs benchmark, and the grammar change has not
noticeably affected the results.
> Implement StandardTokenizer with the UAX#29 Standard
> ----------------------------------------------------
>
> Key: LUCENE-2167
> URL: https://issues.apache.org/jira/browse/LUCENE-2167
> Project: Lucene - Java
> Issue Type: New Feature
> Components: contrib/analyzers
> Affects Versions: 3.1
> Reporter: Shyamal Prasad
> Assignee: Robert Muir
> Priority: Minor
> Attachments: LUCENE-2167-jflex-tld-macro-gen.patch,
> LUCENE-2167-jflex-tld-macro-gen.patch, LUCENE-2167-jflex-tld-macro-gen.patch,
> LUCENE-2167-lucene-buildhelper-maven-plugin.patch,
> LUCENE-2167.benchmark.patch, LUCENE-2167.benchmark.patch,
> LUCENE-2167.benchmark.patch, LUCENE-2167.patch, LUCENE-2167.patch,
> LUCENE-2167.patch, LUCENE-2167.patch, LUCENE-2167.patch, LUCENE-2167.patch,
> LUCENE-2167.patch, LUCENE-2167.patch, LUCENE-2167.patch, LUCENE-2167.patch,
> LUCENE-2167.patch, LUCENE-2167.patch, LUCENE-2167.patch, LUCENE-2167.patch,
> LUCENE-2167.patch, LUCENE-2167.patch, standard.zip,
> StandardTokenizerImpl.jflex
>
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> It would be really nice for StandardTokenizer to adhere straight to the
> standard as much as we can with jflex. Then its name would actually make
> sense.
> Such a transition would involve renaming the old StandardTokenizer to
> EuropeanTokenizer, as its javadoc claims:
> bq. This should be a good tokenizer for most European-language documents
> The new StandardTokenizer could then say
> bq. This should be a good tokenizer for most languages.
> All the english/euro-centric stuff like the acronym/company/apostrophe stuff
> can stay with that EuropeanTokenizer, and it could be used by the european
> analyzers.
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