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<title>CodeMirror: ML-like mode</title><meta charset="utf-8"/><link rel=stylesheet href="../../doc/docs.css">
<link rel=stylesheet href=../../lib/codemirror.css><script src=../../lib/codemirror.js></script><script src=../../addon/edit/matchbrackets.js></script><script src=mllike.js></script><style type=text/css> .CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}</style><div id=nav> <a href="https://codemirror.net/5"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png" alt=""></a>
<ul> <li><a href="../../index.html">Home</a> <li><a href="../../doc/manual.html">Manual</a> <li><a href="https://github.com/codemirror/codemirror5">Code</a> </ul> <ul> <li><a href="../index.html">Language modes</a> <li><a class=active href="#">ML-like</a> </ul></div>
<article><h2>OCaml mode</h2>
<textarea id="ocamlCode">(* Summing a list of integers *)let rec sum xs = match xs with | [] -> 0 | x :: xs' -> x + sum xs'
(* Quicksort *)let rec qsort = function | [] -> [] | pivot :: rest -> let is_less x = x < pivot in let left, right = List.partition is_less rest in qsort left @ [pivot] @ qsort right
(* Fibonacci Sequence *)let rec fib_aux n a b = match n with | 0 -> a | _ -> fib_aux (n - 1) (a + b) alet fib n = fib_aux n 0 1
(* Birthday paradox *)let year_size = 365.
let rec birthday_paradox prob people = let prob' = (year_size -. float people) /. year_size *. prob in if prob' < 0.5 then Printf.printf "answer = %d\n" (people+1) else birthday_paradox prob' (people+1) ;;
birthday_paradox 1.0 1
(* Church numerals *)let zero f x = xlet succ n f x = f (n f x)let one = succ zerolet two = succ (succ zero)let add n1 n2 f x = n1 f (n2 f x)let to_string n = n (fun k -> "S" ^ k) "0"let _ = to_string (add (succ two) two)
(* Elementary functions *)let square x = x * x;;let rec fact x = if x <= 1 then 1 else x * fact (x - 1);;
(* Automatic memory management *)let l = 1 :: 2 :: 3 :: [];;[1; 2; 3];;5 :: l;;
(* Polymorphism: sorting lists *)let rec sort = function | [] -> [] | x :: l -> insert x (sort l)
and insert elem = function | [] -> [elem] | x :: l -> if elem < x then elem :: x :: l else x :: insert elem l;;
(* Imperative features *)let add_polynom p1 p2 = let n1 = Array.length p1 and n2 = Array.length p2 in let result = Array.create (max n1 n2) 0 in for i = 0 to n1 - 1 do result.(i) <- p1.(i) done; for i = 0 to n2 - 1 do result.(i) <- result.(i) + p2.(i) done; result;;add_polynom [| 1; 2 |] [| 1; 2; 3 |];;
(* We may redefine fact using a reference cell and a for loop *)let fact n = let result = ref 1 in for i = 2 to n do result := i * !result done; !result;;fact 5;;
(* Triangle (graphics) *)let () = ignore( Glut.init Sys.argv ); Glut.initDisplayMode ~double_buffer:true (); ignore (Glut.createWindow ~title:"OpenGL Demo"); let angle t = 10. *. t *. t in let render () = GlClear.clear [ `color ]; GlMat.load_identity (); GlMat.rotate ~angle: (angle (Sys.time ())) ~z:1. (); GlDraw.begins `triangles; List.iter GlDraw.vertex2 [-1., -1.; 0., 1.; 1., -1.]; GlDraw.ends (); Glut.swapBuffers () in GlMat.mode `modelview; Glut.displayFunc ~cb:render; Glut.idleFunc ~cb:(Some Glut.postRedisplay); Glut.mainLoop ()
(* A Hundred Lines of Caml - http://caml.inria.fr/about/taste.en.html *)(* OCaml page on Wikipedia - http://en.wikipedia.org/wiki/OCaml *)
module type S = sig type t end
let x = {| this is a long string with many lines and stuff |}
let b = 0b00110let h = 0x123abcdlet e = 1e-10let i = 1.let x = 30_000let o = 0o1234
[1; 2; 3] (* lists *)
1 @ 21. +. 2.</textarea>
<h2>F# mode</h2><textarea id="fsharpCode">module CodeMirror.FSharp
let rec fib = function | 0 -> 0 | 1 -> 1 | n -> fib (n - 1) + fib (n - 2)
type Point = { x : int y : int }
type Color = | Red | Green | Blue
[0 .. 10]|> List.map ((+) 2)|> List.fold (fun x y -> x + y) 0|> printf "%i"</textarea>
<script> var ocamlEditor = CodeMirror.fromTextArea(document.getElementById('ocamlCode'), { mode: 'text/x-ocaml', lineNumbers: true, matchBrackets: true });
var fsharpEditor = CodeMirror.fromTextArea(document.getElementById('fsharpCode'), { mode: 'text/x-fsharp', lineNumbers: true, matchBrackets: true });</script>
<p><strong>MIME types defined:</strong> <code>text/x-ocaml</code> (OCaml) and <code>text/x-fsharp</code> (F#).</p></article>
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