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From "Benson Margulies (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-5202) LookaheadTokenFilter consumes an extra token in nextToken
Date Sun, 08 Sep 2013 15:40:52 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-5202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13761475#comment-13761475
] 

Benson Margulies commented on LUCENE-5202:
------------------------------------------

OK, I see.

So I'll leave it to you to apply this patch to pick up the fix you made.

thanks
                
> LookaheadTokenFilter consumes an extra token in nextToken
> ---------------------------------------------------------
>
>                 Key: LUCENE-5202
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5202
>             Project: Lucene - Core
>          Issue Type: Bug
>    Affects Versions: 4.3.1
>            Reporter: Benson Margulies
>         Attachments: LUCENE-5202.patch, LUCENE-5202.patch
>
>
> This is a bit hard to explain except by looking at the test case. I've coded a filter
that uses LookaheadTokenFilter. The incrementToken method peeks some tokens. Then, it seems,
nextToken in the Lookahead class calls peekToken itself, which seems to me to consume a token
so that it's not seen when the derived class sets out to process the next set of tokens.
> In passing, this test case can be used to demonstrate that it does not work to try to
use the afterPosition method to set up attributes of the token that we're 'after'. Probably
that was never intended. However, I'm hoping for some feedback as to whether the rest of the
structure here is as intended for subclasses of LookaheadTokenFilter.

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