File modules/editor/codemirror/mode/haskell/index.html

Last commit: Sun Dec 17 01:14:09 2017 +0100	Jan Dankert	Integration eines weiteren Code-Editors: Codemirror. Demnächst müssen wir hier mal aufräumen und andere Editoren rauswerfen.


     1 <!doctype html>
     2 
     3 <title>CodeMirror: Haskell mode</title>
     4 <meta charset="utf-8"/>
     5 <link rel=stylesheet href="../../doc/docs.css">
     6 
     7 <link rel="stylesheet" href="../../lib/codemirror.css">
     8 <link rel="stylesheet" href="../../theme/elegant.css">
     9 <script src="../../lib/codemirror.js"></script>
    10 <script src="../../addon/edit/matchbrackets.js"></script>
    11 <script src="haskell.js"></script>
    12 <style type="text/css">.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}</style>
    13 <div id=nav>
    14   <a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>
    15 
    16   <ul>
    17     <li><a href="../../index.html">Home</a>
    18     <li><a href="../../doc/manual.html">Manual</a>
    19     <li><a href="https://github.com/codemirror/codemirror">Code</a>
    20   </ul>
    21   <ul>
    22     <li><a href="../index.html">Language modes</a>
    23     <li><a class=active href="#">Haskell</a>
    24   </ul>
    25 </div>
    26 
    27 <article>
    28 <h2>Haskell mode</h2>
    29 <form><textarea id="code" name="code">
    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
    62 </textarea></form>
    63 
    64     <script>
    65       var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
    66         lineNumbers: true,
    67         matchBrackets: true,
    68         theme: "elegant"
    69       });
    70     </script>
    71 
    72     <p><strong>MIME types defined:</strong> <code>text/x-haskell</code>.</p>
    73   </article>



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Sun, 17 Dec 2017 01:14:09 +0100	Jan Dankert	Integration eines weiteren Code-Editors: Codemirror. Demnächst müssen wir hier mal aufräumen und andere Editoren rauswerfen.