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From "Steven Rowe (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2167) Implement StandardTokenizer with the UAX#29 Standard
Date Tue, 29 Jun 2010 19:15:50 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12883659#action_12883659
] 

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

Robert,

Special handling for bracketed URLs makes no sense - that rule can be dropped.

Bracketed emails are useful, though, since the domain in the host portion doesn't need to
be a registerable domain.  I think this could be handled with two changes to the bracketed
email rule.  Here it is in the form you wrote:

{code}
"<" {EMAILaddressLoose} ">" { return EMAIL_TYPE; }
{code}

Here is my suggestion:

{code}
"<" {EMAILaddressLoose} / ">" { ++zzStartRead; return EMAIL_TYPE; }
{code}

This combines incrementing the start of the matched region ({{++zzStartRead;}}) and lookahead
for the trailing angle bracket ({{/ ">"}}).  AFAICT, directly modifying {{zzStartRead}}
shouldn't cause any problems.  After this rule completes, the trailing angle bracket will
be at the beginning of the remaining text to be matched.


> 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.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
>
>   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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