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From "Steven Rowe (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2167) Implement StandardTokenizer with the UAX#29 Standard
Date Mon, 07 Jun 2010 08:02:02 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2167?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steven Rowe updated LUCENE-2167:
--------------------------------

    Attachment: LUCENE-2167.patch

New patch incorporating Uwe's JFlex TLD macro generation patch (with a few small adjustments),
and also including a jflex grammar for a new class: NewStandardTokenizer.  This grammar adds
recognition of URLs, e-mail addresses, and host names and IP addresses (both v4 and v6) to
the UAX29Tokenizer grammar.  

This is a work in progress -- testing for http: scheme URLs and e-mail addresses is included,
but there is no testing yet for the file:, https:, or ftp: schemes.

I have dropped the idea of recognizing mailto: URIs, because these seem more complicated than
they are worth (mailto: URIs can include multiple email addresses, comments, full email bodies,
etc.).  E-mail addresses within mailto: URIs should still be recognized.

WARNING: I had to invoke Ant with a 900MB heap ({{ANT_OPTS=-Xmx900m ant jflex}} on Windows
Vista, 64 bit Sun 1.) in order to allow the JFlex generation process to complete for NewStandardTokenizer;
the process also took a minute or two to finish.

> 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: Steven Rowe
>            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.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
>
>   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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