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LUCENE-10081: KoreanTokenizer should check the max backtrace gap on whitespaces (#272) 

This change ensures that we don't skip consecutive whitespaces without checking the maximum backtrace gap.
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Jim Ferenczi 2021-09-06 08:46:39 +02:00 committed by GitHub
parent 34f37d0d43
commit 4df8d641ac
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2 changed files with 9 additions and 12 deletions
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3
lucene/CHANGES.txt
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@ -484,6 +484,9 @@ Bug Fixes
* LUCENE-10060: Ensure DrillSidewaysQuery instances never get cached. (Greg Miller, Zachary Chen)
* LUCENE-10081: KoreanTokenizer should check the max backtrace gap on whitespaces.
(Jim Ferenczi)
Other
---------------------
(No changes)

18
lucene/analysis/nori/src/java/org/apache/lucene/analysis/ko/KoreanTokenizer.java
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@ -746,21 +746,15 @@ public final class KoreanTokenizer extends Tokenizer {
System.out.println(" " + posData.count + " arcs in");
}
// Move to the first character that is not a whitespace.
// The whitespaces are added as a prefix for the term that we extract,
// this information is then used when computing the cost for the term using
// the space penalty factor.
// They are removed when the final tokens are generated.
// We add single space separator as prefixes of the terms that we extract.
// This information is needed to compute the space penalty factor of each term.
// These whitespace prefixes are removed when the final tokens are generated, or
// added as separated tokens when discardPunctuation is unset.
if (Character.getType(buffer.get(pos)) == Character.SPACE_SEPARATOR) {
int nextChar = buffer.get(++pos);
while (nextChar != -1 && Character.getType(nextChar) == Character.SPACE_SEPARATOR) {
pos++;
nextChar = buffer.get(pos);
if (buffer.get(++pos) == -1) {
pos = posData.pos;
}
}
if (buffer.get(pos) == -1) {
pos = posData.pos;
}
boolean anyMatches = false;