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Add the mappedness conditions to the alternative definition.

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This commit is contained in:
Rob Rix 2017-10-23 16:12:38 -04:00
parent e57b96c1de
commit 44e58494af
1 changed files with 3 additions and 3 deletions
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6
src/RWS.hs
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@ -183,12 +183,12 @@ findNearestNeighbourTo' canCompare kdTreeA kdTreeB = go
where go _ [] [] = []
go _ as [] = This . (termIndex &&& term) <$> as
go _ [] bs = That . (termIndex &&& term) <$> bs
go previous unmappedA@(_ : restUnmappedA) (termB@(UnmappedTerm j _ b) : restUnmappedB) =
go previous unmappedA@(UnmappedTerm minA _ _ : restUnmappedA) (termB@(UnmappedTerm j _ b) : restUnmappedB) =
fromMaybe (That (j, b) : go previous unmappedA restUnmappedB) $ do
-- Look up the nearest unmapped term in `unmappedA`.
foundA@(UnmappedTerm i _ a) <- nearestUnmapped (isNearAndComparableTo canCompare previous b) kdTreeA termB
foundA@(UnmappedTerm i _ a) <- nearestUnmapped (\ a -> isNearAndComparableTo canCompare previous b a && termIndex a >= minA) kdTreeA termB
-- Look up the nearest `foundA` in `unmappedB`
UnmappedTerm j' _ _ <- nearestUnmapped (isNearAndComparableTo (flip canCompare) (pred j) a) kdTreeB foundA
UnmappedTerm j' _ _ <- nearestUnmapped (\ b -> isNearAndComparableTo (flip canCompare) (pred j) a b && termIndex b >= j) kdTreeB foundA
-- Return Nothing if their indices don't match
guard (j == j')
pure $!