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-<!doctype html>
-<html>
- <head>
- <title>CodeMirror 2: Haskell mode</title>
- <link rel="stylesheet" href="../../lib/codemirror.css">
- <script src="../../lib/codemirror.js"></script>
- <script src="haskell.js"></script>
- <link rel="stylesheet" href="haskell.css">
- <style type="text/css">.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}</style>
- <link rel="stylesheet" href="../../css/docs.css">
- </head>
- <body>
- <h1>CodeMirror 2: Haskell mode</h1>
-
-<form><textarea id="code" name="code">
-module UniquePerms (
- uniquePerms
- )
-where
-
--- | Find all unique permutations of a list where there might be duplicates.
-uniquePerms :: (Eq a) => [a] -> [[a]]
-uniquePerms = permBag . makeBag
-
--- | An unordered collection where duplicate values are allowed,
--- but represented with a single value and a count.
-type Bag a = [(a, Int)]
-
-makeBag :: (Eq a) => [a] -> Bag a
-makeBag [] = []
-makeBag (a:as) = mix a $ makeBag as
- where
- mix a [] = [(a,1)]
- mix a (bn@(b,n):bs) | a == b = (b,n+1):bs
- | otherwise = bn : mix a bs
-
-permBag :: Bag a -> [[a]]
-permBag [] = [[]]
-permBag bs = concatMap (\(f,cs) -> map (f:) $ permBag cs) . oneOfEach $ bs
- where
- oneOfEach [] = []
- oneOfEach (an@(a,n):bs) =
- let bs' = if n == 1 then bs else (a,n-1):bs
- in (a,bs') : mapSnd (an:) (oneOfEach bs)
-
- apSnd f (a,b) = (a, f b)
- mapSnd = map . apSnd
-</textarea></form>
-
- <script>
- var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
- lineNumbers: true,
- matchBrackets: true
- });
- </script>
-
- <p><strong>MIME types defined:</strong> <code>text/x-haskell</code>.</p>
- </body>
-</html>