mirror of
https://github.com/renbaoshuo/S2OJ.git
synced 2024-09-21 09:15:19 +00:00
96d4a3ecf7
Due to historical reasons, the code is in subfolder "1". With SVN removal, we place the code back and remove the annoying "1" folder.
180 lines
4.3 KiB
HTML
180 lines
4.3 KiB
HTML
<!doctype html>
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<title>CodeMirror: ML-like mode</title>
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<meta charset="utf-8"/>
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<link rel=stylesheet href="../../doc/docs.css">
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<link rel=stylesheet href=../../lib/codemirror.css>
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<script src=../../lib/codemirror.js></script>
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<script src=../../addon/edit/matchbrackets.js></script>
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<script src=mllike.js></script>
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<style type=text/css>
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.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}
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</style>
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<div id=nav>
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<a href="http://codemirror.net"><img id=logo src="../../doc/logo.png"></a>
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<ul>
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<li><a href="../../index.html">Home</a>
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<li><a href="../../doc/manual.html">Manual</a>
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<li><a href="https://github.com/marijnh/codemirror">Code</a>
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</ul>
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<ul>
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<li><a href="../index.html">Language modes</a>
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<li><a class=active href="#">ML-like</a>
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</ul>
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</div>
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<article>
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<h2>OCaml mode</h2>
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<textarea id="ocamlCode">
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(* Summing a list of integers *)
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let rec sum xs =
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match xs with
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| [] -> 0
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| x :: xs' -> x + sum xs'
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(* Quicksort *)
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let rec qsort = function
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| [] -> []
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| pivot :: rest ->
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let is_less x = x < pivot in
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let left, right = List.partition is_less rest in
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qsort left @ [pivot] @ qsort right
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(* Fibonacci Sequence *)
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let rec fib_aux n a b =
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match n with
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| 0 -> a
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| _ -> fib_aux (n - 1) (a + b) a
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let fib n = fib_aux n 0 1
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(* Birthday paradox *)
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let year_size = 365.
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let rec birthday_paradox prob people =
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let prob' = (year_size -. float people) /. year_size *. prob in
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if prob' < 0.5 then
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Printf.printf "answer = %d\n" (people+1)
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else
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birthday_paradox prob' (people+1) ;;
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birthday_paradox 1.0 1
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(* Church numerals *)
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let zero f x = x
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let succ n f x = f (n f x)
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let one = succ zero
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let two = succ (succ zero)
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let add n1 n2 f x = n1 f (n2 f x)
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let to_string n = n (fun k -> "S" ^ k) "0"
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let _ = to_string (add (succ two) two)
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(* Elementary functions *)
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let square x = x * x;;
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let rec fact x =
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if x <= 1 then 1 else x * fact (x - 1);;
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(* Automatic memory management *)
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let l = 1 :: 2 :: 3 :: [];;
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[1; 2; 3];;
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5 :: l;;
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(* Polymorphism: sorting lists *)
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let rec sort = function
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| [] -> []
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| x :: l -> insert x (sort l)
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and insert elem = function
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| [] -> [elem]
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| x :: l ->
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if elem < x then elem :: x :: l else x :: insert elem l;;
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(* Imperative features *)
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let add_polynom p1 p2 =
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let n1 = Array.length p1
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and n2 = Array.length p2 in
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let result = Array.create (max n1 n2) 0 in
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for i = 0 to n1 - 1 do result.(i) <- p1.(i) done;
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for i = 0 to n2 - 1 do result.(i) <- result.(i) + p2.(i) done;
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result;;
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add_polynom [| 1; 2 |] [| 1; 2; 3 |];;
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(* We may redefine fact using a reference cell and a for loop *)
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let fact n =
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let result = ref 1 in
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for i = 2 to n do
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result := i * !result
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done;
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!result;;
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fact 5;;
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(* Triangle (graphics) *)
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let () =
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ignore( Glut.init Sys.argv );
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Glut.initDisplayMode ~double_buffer:true ();
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ignore (Glut.createWindow ~title:"OpenGL Demo");
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let angle t = 10. *. t *. t in
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let render () =
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GlClear.clear [ `color ];
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GlMat.load_identity ();
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GlMat.rotate ~angle: (angle (Sys.time ())) ~z:1. ();
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GlDraw.begins `triangles;
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List.iter GlDraw.vertex2 [-1., -1.; 0., 1.; 1., -1.];
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GlDraw.ends ();
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Glut.swapBuffers () in
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GlMat.mode `modelview;
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Glut.displayFunc ~cb:render;
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Glut.idleFunc ~cb:(Some Glut.postRedisplay);
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Glut.mainLoop ()
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(* A Hundred Lines of Caml - http://caml.inria.fr/about/taste.en.html *)
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(* OCaml page on Wikipedia - http://en.wikipedia.org/wiki/OCaml *)
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</textarea>
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<h2>F# mode</h2>
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<textarea id="fsharpCode">
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module CodeMirror.FSharp
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let rec fib = function
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| 0 -> 0
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| 1 -> 1
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| n -> fib (n - 1) + fib (n - 2)
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type Point =
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{
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x : int
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y : int
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}
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type Color =
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| Red
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| Green
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| Blue
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[0 .. 10]
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|> List.map ((+) 2)
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|> List.fold (fun x y -> x + y) 0
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|> printf "%i"
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</textarea>
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<script>
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var ocamlEditor = CodeMirror.fromTextArea(document.getElementById('ocamlCode'), {
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mode: 'text/x-ocaml',
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lineNumbers: true,
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matchBrackets: true
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});
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var fsharpEditor = CodeMirror.fromTextArea(document.getElementById('fsharpCode'), {
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mode: 'text/x-fsharp',
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lineNumbers: true,
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matchBrackets: true
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});
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</script>
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<p><strong>MIME types defined:</strong> <code>text/x-ocaml</code> (OCaml) and <code>text/x-fsharp</code> (F#).</p>
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</article>
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