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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