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author Coffee CMS <info@coffee-cms.ru>
date Fri, 11 Oct 2024 22:40:23 +0000
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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>.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}</style>
13 <div id=nav>
14 <a href="https://codemirror.net/5"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png" alt=""></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/codemirror5">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>