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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>