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Add a maybeUnionRanges function.

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Rob Rix 2016-03-04 19:59:31 -05:00
parent 7cb85f6571
commit 34e798cb09
1 changed files with 3 additions and 0 deletions
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src/Range.hs
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@ -72,6 +72,9 @@ unionRanges = unionRangesFrom (Range 0 0)
unionRangesFrom :: (Functor f, Foldable f) => Range -> f Range -> Range
unionRangesFrom range ranges = option range id . foldl mappend mempty $ Option . Just <$> ranges
maybeUnionRanges :: (Functor f, Foldable f) => f Range -> Maybe Range
maybeUnionRanges ranges = getOption $ foldl mappend mempty $ Option . Just <$> ranges
instance Monoid (Option Range) where
mempty = Option Nothing
mappend (Option (Just a)) (Option (Just b)) = Option (Just (unionRange a b))