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📝 firstAnnotation.

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Rob Rix 2016-07-05 09:35:47 -04:00
parent 1e2ff9340f
commit be674ecd97
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src/Data/RandomWalkSimilarity.hs
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@ -43,6 +43,7 @@ rws compare getLabel as bs
pure $! fromMaybe (replace found v) (compare found v)
deleteRemaining diffs unmapped = foldl' (flip (List.insertBy (comparing firstAnnotation))) diffs (delete . snd <$> unmapped)
-- | Extract the annotation for the before state of a diff node. This is returned in `Maybe` because e.g. an `Insert` patch does not have an annotation for the before state.
firstAnnotation :: Diff leaf annotation -> Maybe annotation
firstAnnotation diff = case runFree diff of
Free (annotations :< _) -> Just (fst (runJoin annotations))