| 776 |
lars |
1 |
<!doctype html>
|
|
|
2 |
<title>CodeMirror: Haskell mode</title>
|
|
|
3 |
<meta charset="utf-8" />
|
|
|
4 |
<link rel=stylesheet href="../../doc/docs.css">
|
|
|
5 |
<link rel="stylesheet" href="../../lib/codemirror.css">
|
|
|
6 |
<link rel="stylesheet" href="../../theme/elegant.css">
|
|
|
7 |
<script src="../../lib/codemirror.js"></script>
|
|
|
8 |
<script src="../../addon/edit/matchbrackets.js"></script>
|
|
|
9 |
<script src="haskell.js"></script>
|
|
|
10 |
<style type="text/css">
|
|
|
11 |
.CodeMirror {
|
|
|
12 |
border-top: 1px solid black;
|
|
|
13 |
border-bottom: 1px solid black;
|
|
|
14 |
}
|
|
|
15 |
</style>
|
|
|
16 |
<div id=nav>
|
|
|
17 |
<a href="http://codemirror.net">
|
|
|
18 |
<h1>CodeMirror</h1>
|
|
|
19 |
<img id=logo src="../../doc/logo.png">
|
|
|
20 |
</a>
|
|
|
21 |
<ul>
|
|
|
22 |
<li>
|
|
|
23 |
<a href="../../index.html">Home</a>
|
|
|
24 |
<li>
|
|
|
25 |
<a href="../../doc/manual.html">Manual</a>
|
|
|
26 |
<li>
|
|
|
27 |
<a href="https://github.com/codemirror/codemirror">Code</a>
|
|
|
28 |
</ul>
|
|
|
29 |
<ul>
|
|
|
30 |
<li>
|
|
|
31 |
<a href="../index.html">Language modes</a>
|
|
|
32 |
<li>
|
|
|
33 |
<a class=active href="#">Haskell</a>
|
|
|
34 |
</ul>
|
|
|
35 |
</div>
|
|
|
36 |
<article>
|
|
|
37 |
<h2>Haskell mode</h2>
|
|
|
38 |
<form>
|
|
|
39 |
<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
|
|
|
40 |
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 |
|
|
|
41 |
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
|
|
|
42 |
in (a,bs') : mapSnd (an:) (oneOfEach bs) apSnd f (a,b) = (a, f b) mapSnd = map . apSnd </textarea>
|
|
|
43 |
</form>
|
|
|
44 |
<script>
|
|
|
45 |
var editor = CodeMirror.fromTextArea(document.getElementById("code"),
|
|
|
46 |
{
|
|
|
47 |
lineNumbers: true,
|
|
|
48 |
matchBrackets: true,
|
|
|
49 |
theme: "elegant"
|
|
|
50 |
});
|
|
|
51 |
</script>
|
|
|
52 |
<p>
|
|
|
53 |
<strong>MIME types defined:</strong> <code>text/x-haskell</code>.</p>
|
|
|
54 |
</article>
|