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Span and split the intersecting first lines.

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This commit is contained in:
Rob Rix 2016-04-13 11:08:01 -04:00
parent 2f241803af
commit de05043c67
1 changed files with 8 additions and 0 deletions
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src/Alignment.hs
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@ -153,6 +153,14 @@ group2 ranges children | Just (headRanges, tailRanges) <- unconsThese ranges
| ([]:rest) <- children = group2 ranges rest | ([]:rest) <- children = group2 ranges rest
| otherwise = ([] <$ ranges, children, fmap (flip (,) []) <$> sequenceL ranges) | otherwise = ([] <$ ranges, children, fmap (flip (,) []) <$> sequenceL ranges)
spanAndSplitFirstLines :: (Join These a -> Join These Bool) -> [[Join These a]] -> ([Join These a], [[Join These a]])
spanAndSplitFirstLines pred = foldr go ([], [])
where go (first:rest) (fs, rs) = let ~(l, r) = split first in case fromThese False False . runJoin $ pred first of
(True, True) -> (first : fs, rest : rs)
(True, False) -> (head l : fs, (r ++ rest) : rs)
(False, True) -> (head r : fs, (l ++ rest) : rs)
_ -> (fs, (first:rest):rs)
-- | Partitions and splits a list of children into a tuple consisting of: -- | Partitions and splits a list of children into a tuple consisting of:
-- | - elements which matched; if an element matches only partially this field will contain only the matching side -- | - elements which matched; if an element matches only partially this field will contain only the matching side
-- | - the left sides of elements which matched only on the right side -- | - the left sides of elements which matched only on the right side