github.com/jancarloviray/community@v0.41.1-0.20170124221257-33a66c87cf2f/app/public/codemirror/mode/haskell/index.html (about)

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    30  module UniquePerms (
    31      uniquePerms
    32      )
    33  where
    34  
    35  -- | Find all unique permutations of a list where there might be duplicates.
    36  uniquePerms :: (Eq a) => [a] -> [[a]]
    37  uniquePerms = permBag . makeBag
    38  
    39  -- | An unordered collection where duplicate values are allowed,
    40  -- but represented with a single value and a count.
    41  type Bag a = [(a, Int)]
    42  
    43  makeBag :: (Eq a) => [a] -> Bag a
    44  makeBag [] = []
    45  makeBag (a:as) = mix a $ makeBag as
    46    where
    47      mix a []                        = [(a,1)]
    48      mix a (bn@(b,n):bs) | a == b    = (b,n+1):bs
    49                          | otherwise = bn : mix a bs
    50  
    51  permBag :: Bag a -> [[a]]
    52  permBag [] = [[]]
    53  permBag bs = concatMap (\(f,cs) -> map (f:) $ permBag cs) . oneOfEach $ bs
    54    where
    55      oneOfEach [] = []
    56      oneOfEach (an@(a,n):bs) =
    57          let bs' = if n == 1 then bs else (a,n-1):bs
    58          in (a,bs') : mapSnd (an:) (oneOfEach bs)
    59      
    60      apSnd f (a,b) = (a, f b)
    61      mapSnd = map . apSnd
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