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https://issues.apache.org/jira/browse/LUCENE-4019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13260612#comment-13260612
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Luca Cavanna commented on LUCENE-4019:
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Robert, with "spec" I meant exactly your links :)
Actually it's clear that the affix header has 4 elements while each rule has at
least 5 elements. I don't really know what hunspell does with that kind of
malformed rules. Lucene just throws an error while loading the dictionary.
Looking at the hunspell source code, I might be wrong but I suspect it just
skips that specific rule with some warning. But honestly it's hard to believe
that at least 4 dictionaries I tried contain mistaken rules, isn't it? I'll
investigate more, thanks!
> Parsing Hunspell affix rules without regexp condition
> -----------------------------------------------------
>
> Key: LUCENE-4019
> URL: https://issues.apache.org/jira/browse/LUCENE-4019
> Project: Lucene - Java
> Issue Type: Improvement
> Components: modules/analysis
> Affects Versions: 3.6
> Reporter: Luca Cavanna
>
> We found out that some recent Dutch hunspell dictionaries contain suffix or
> prefix rules like the following:
> {code}
> SFX Na N 1
> SFX Na 0 ste
> {code}
> The rule on the second line doesn't contain the 5th parameter, which should
> be the condition (a regexp usually). You can usually see a '.' as condition,
> meaning always (for every character). As explained in LUCENE-3976 the
> readAffix method throws error. I wonder if we should treat the missing value
> as a kind of default value, like '.'. On the other hand I haven't found any
> information about this within the spec. Any thoughts?
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