dsmiley commented on a change in pull request #1123: LUCENE-9093: Unified
highlighter with word separator never gives context to the left
URL: https://github.com/apache/lucene-solr/pull/1123#discussion_r361539250
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File path:
lucene/highlighter/src/java/org/apache/lucene/search/uhighlight/LengthGoalBreakIterator.java
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@@ -174,7 +175,48 @@ private int moveToBreak(int idx) { // precondition: idx
is a known break
// called at start of new Passage given first word start offset
@Override
public int preceding(int offset) {
- return baseIter.preceding(offset); // no change needed
+ final int fragmentStart = Math.max(baseIter.preceding(offset), 0); //
convert DONE to 0
+ fragmentEndFromPreceding = baseIter.following(fragmentStart);
+ if (fragmentEndFromPreceding == DONE) {
+ fragmentEndFromPreceding = baseIter.last();
+ }
+ final int centerLength = fragmentEndFromPreceding - fragmentStart;
+ final int extraPrecedingLengthGoal = (int)((lengthGoal - centerLength) *
fragmentAlignment);
Review comment:
I'm glad you're cool with entertaining reworking the whole thing :-) BTW my
proposal is rather incomplete or imperfect or both. We probably won't get a
perfect lengthGoal hit (hence "goal" in the name). And we almost certainly
won't get a perfect fragmentAlignment ratio with before/after -- it should
perhaps also have "goal" in the name. So whatever the solution is will have
some inherent fuzziness to it. This is probably all obvious to you but I just
want to state I'm aware you can poke lots of holes in my proposal. I just
think we can do a bit better than your original proposal by using some more
information.
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