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From "Steven Rowe (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2167) Implement StandardTokenizer with the UAX#29 Standard
Date Sun, 07 Nov 2010 23:26:06 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12929408#action_12929408
] 

Steven Rowe commented on LUCENE-2167:
-------------------------------------

bq. Why don't we teach StandardTokenizer to produce tokens for separator chars?

I've been thinking about this - the word break rules in UAX#29 are intended for use in break
iterators, and tokenizers take that one step further by discarding stuff between some breaks.

StandardTokenizer is faster, though, since it doesn't have to tokenize the stuff between tokens,
so if we go down this route, I think it should go somewhere else: UAX29WordBreakSegmenter
or something like that.

I'd like to have (nestable) SentenceSegmenter, ParagraphSegmenter, etc., the output from which
could be the input to tokenizers.

> 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, 4.0
>            Reporter: Shyamal Prasad
>            Assignee: Steven Rowe
>            Priority: Minor
>             Fix For: 3.1, 4.0
>
>         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,
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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