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Simplify focusUp/Down

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This commit is contained in:
Spencer Janssen
2007-06-04 18:22:28 +00:00
parent fc70307325
commit 89a31eaf52
1 changed files with 2 additions and 4 deletions
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6
StackSet.hs
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@@ -272,14 +272,12 @@ index = with [] integrate
--
focusUp, focusDown, swapUp, swapDown :: StackSet i a s -> StackSet i a s
focusUp = modify Empty $ \c -> case c of
Node _ [] [] -> c
Node t (l:ls) rs -> Node l ls (t:rs)
Node t [] rs -> Node x (xs ++ [t]) [] where (x:xs) = reverse rs
Node t [] rs -> Node x xs [] where (x:xs) = reverse (t:rs)
focusDown = modify Empty $ \c -> case c of
Node _ [] [] -> c
Node t ls (r:rs) -> Node r (t:ls) rs
Node t ls [] -> Node x [] (xs ++ [t]) where (x:xs) = reverse ls
Node t ls [] -> Node x [] xs where (x:xs) = reverse (t:ls)
swapUp = modify Empty $ \c -> case c of
Node _ [] [] -> c