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Posted to dev@lucene.apache.org by "Adrien Grand (JIRA)" <ji...@apache.org> on 2013/06/06 17:29:19 UTC

[jira] [Created] (LUCENE-5042) Improve NGramTokenizer

Adrien Grand created LUCENE-5042:
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             Summary: Improve NGramTokenizer
                 Key: LUCENE-5042
                 URL: https://issues.apache.org/jira/browse/LUCENE-5042
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Adrien Grand
            Assignee: Adrien Grand
             Fix For: 5.0, 4.4


Now that we fixed NGramTokenizer and NGramTokenFilter to not produce corrupt token streams, the only way to have "true" offsets for n-grams is to use the tokenizer (the filter emits the offsets of the original token).

Yet, our NGramTokenizer has a few flaws, in particular:
 - it doesn't have the ability to pre-tokenize the input stream, for example on whitespaces,
 - it doesn't play nice with surrogate pairs.

Since we already broke backward compatibility for it in 4.4, I'd like to also fix these issues before we release.

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