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From "Shyamal Prasad (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2167) StandardTokenizer Javadoc does not correctly describe tokenization around punctuation characters
Date Thu, 25 Feb 2010 22:44:28 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12838574#action_12838574
] 

Shyamal Prasad commented on LUCENE-2167:
----------------------------------------

Robert Muir wrote:
{quote}
I would love it if you could produce a grammar that implemented UAX#29!

If so, in my opinion it should become the StandardAnalyzer for the next lucene version. If
I thought I could do it correctly, I would have already done it, as the support for the unicode
properties needed to do this is now in the trunk of Jflex!
{quote}

I'm not smart enough to know if I should even try to do it at all (leave alone correctly),
but am always willing to learn! Thanks for the references, I will certainly give it an honest
try.

/Shyamal

> StandardTokenizer Javadoc does not correctly describe tokenization around punctuation
characters
> ------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-2167
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2167
>             Project: Lucene - Java
>          Issue Type: Bug
>    Affects Versions: 2.4.1, 2.9, 2.9.1, 3.0
>            Reporter: Shyamal Prasad
>            Priority: Minor
>         Attachments: LUCENE-2167.patch, LUCENE-2167.patch
>
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
>
> The Javadoc for StandardTokenizer states:
> {quote}
> Splits words at punctuation characters, removing punctuation. 
> However, a dot that's not followed by whitespace is considered part of a token.
> Splits words at hyphens, unless there's a number in the token, in which case the whole

> token is interpreted as a product number and is not split.
> {quote}
> This is not accurate. The actual JFlex implementation treats hyphens interchangeably
with
> punctuation. So, for example "video,mp4,test" results in a *single* token and not three
tokens
> as the documentation would suggest.
> Additionally, the documentation suggests that "video-mp4-test-again" would become a single
> token, but in reality it results in two tokens: "video-mp4-test" and "again".
> IMHO the parser implementation is fine as is since it is hard to keep everyone happy,
but it is probably
> worth cleaning up the documentation string. 
> The patch included here updates the documentation string and adds a few test cases to
confirm the cases described above.

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