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comparison .cms/lib/codemirror/mode/haskell/index.html @ 0:78edf6b517a0 draft
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author | Coffee CMS <info@coffee-cms.ru> |
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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> |