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Cleanup of shift code

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Michael G. Sloan
2007-07-22 20:53:37 +00:00
parent fc70bed46b
commit 5068bd27f0
1 changed files with 4 additions and 4 deletions
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8
StackSet.hs
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@@ -487,7 +487,7 @@ swapMaster = modify' $ \c -> case c of
-- element on the current stack, the original stackSet is returned.
--
shift :: (Ord a, Eq s, Integral i) => i -> StackSet i a s sd -> StackSet i a s sd
shift n s = if and [n >= 0,n `tagMember` s, n /= tag (workspace (current s))]
then maybe s go (peek s) else s
where go w = foldr ($) s [view (tag (workspace (current s))),insertUp w,view n,delete w]
-- ^^ poor man's state monad :-)
shift n s = if n >= 0 && n `tagMember` s && n /= curtag
then maybe s go (peek s) else s
where go w = view curtag . insertUp w . view n . delete w $ s
curtag = tag (workspace (current s))