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<!doctype html>
<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="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>
<ul>
<li><a href="../../index.html">Home</a>
<li><a href="../../doc/manual.html">Manual</a>
<li><a href="https://github.com/codemirror/codemirror">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
| [] -&gt; 0
| x :: xs' -&gt; x + sum xs'
(* Quicksort *)
let rec qsort = function
| [] -&gt; []
| pivot :: rest -&gt;
let is_less x = x &lt; 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 -&gt; a
| _ -&gt; fib_aux (n - 1) (a + b) a
let 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' &lt; 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 = x
let succ n f x = f (n f x)
let one = succ zero
let two = succ (succ zero)
let add n1 n2 f x = n1 f (n2 f x)
let to_string n = n (fun k -&gt; "S" ^ k) "0"
let _ = to_string (add (succ two) two)
(* Elementary functions *)
let square x = x * x;;
let rec fact x =
if x &lt;= 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
| [] -&gt; []
| x :: l -&gt; insert x (sort l)
and insert elem = function
| [] -&gt; [elem]
| x :: l -&gt;
if elem &lt; 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) &lt;- p1.(i) done;
for i = 0 to n2 - 1 do result.(i) &lt;- 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 *)
</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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// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE
(function(mod) {
if (typeof exports == "object" && typeof module == "object") // CommonJS
mod(require("../../lib/codemirror"));
else if (typeof define == "function" && define.amd) // AMD
define(["../../lib/codemirror"], mod);
else // Plain browser env
mod(CodeMirror);
})(function(CodeMirror) {
"use strict";
CodeMirror.defineMode('mllike', function(_config, parserConfig) {
var words = {
'let': 'keyword',
'rec': 'keyword',
'in': 'keyword',
'of': 'keyword',
'and': 'keyword',
'if': 'keyword',
'then': 'keyword',
'else': 'keyword',
'for': 'keyword',
'to': 'keyword',
'while': 'keyword',
'do': 'keyword',
'done': 'keyword',
'fun': 'keyword',
'function': 'keyword',
'val': 'keyword',
'type': 'keyword',
'mutable': 'keyword',
'match': 'keyword',
'with': 'keyword',
'try': 'keyword',
'open': 'builtin',
'ignore': 'builtin',
'begin': 'keyword',
'end': 'keyword'
};
var extraWords = parserConfig.extraWords || {};
for (var prop in extraWords) {
if (extraWords.hasOwnProperty(prop)) {
words[prop] = parserConfig.extraWords[prop];
}
}
function tokenBase(stream, state) {
var ch = stream.next();
if (ch === '"') {
state.tokenize = tokenString;
return state.tokenize(stream, state);
}
if (ch === '(') {
if (stream.eat('*')) {
state.commentLevel++;
state.tokenize = tokenComment;
return state.tokenize(stream, state);
}
}
if (ch === '~') {
stream.eatWhile(/\w/);
return 'variable-2';
}
if (ch === '`') {
stream.eatWhile(/\w/);
return 'quote';
}
if (ch === '/' && parserConfig.slashComments && stream.eat('/')) {
stream.skipToEnd();
return 'comment';
}
if (/\d/.test(ch)) {
stream.eatWhile(/[\d]/);
if (stream.eat('.')) {
stream.eatWhile(/[\d]/);
}
return 'number';
}
if ( /[+\-*&%=<>!?|]/.test(ch)) {
return 'operator';
}
stream.eatWhile(/\w/);
var cur = stream.current();
return words[cur] || 'variable';
}
function tokenString(stream, state) {
var next, end = false, escaped = false;
while ((next = stream.next()) != null) {
if (next === '"' && !escaped) {
end = true;
break;
}
escaped = !escaped && next === '\\';
}
if (end && !escaped) {
state.tokenize = tokenBase;
}
return 'string';
};
function tokenComment(stream, state) {
var prev, next;
while(state.commentLevel > 0 && (next = stream.next()) != null) {
if (prev === '(' && next === '*') state.commentLevel++;
if (prev === '*' && next === ')') state.commentLevel--;
prev = next;
}
if (state.commentLevel <= 0) {
state.tokenize = tokenBase;
}
return 'comment';
}
return {
startState: function() {return {tokenize: tokenBase, commentLevel: 0};},
token: function(stream, state) {
if (stream.eatSpace()) return null;
return state.tokenize(stream, state);
},
blockCommentStart: "(*",
blockCommentEnd: "*)",
lineComment: parserConfig.slashComments ? "//" : null
};
});
CodeMirror.defineMIME('text/x-ocaml', {
name: 'mllike',
extraWords: {
'succ': 'keyword',
'trace': 'builtin',
'exit': 'builtin',
'print_string': 'builtin',
'print_endline': 'builtin',
'true': 'atom',
'false': 'atom',
'raise': 'keyword'
}
});
CodeMirror.defineMIME('text/x-fsharp', {
name: 'mllike',
extraWords: {
'abstract': 'keyword',
'as': 'keyword',
'assert': 'keyword',
'base': 'keyword',
'class': 'keyword',
'default': 'keyword',
'delegate': 'keyword',
'downcast': 'keyword',
'downto': 'keyword',
'elif': 'keyword',
'exception': 'keyword',
'extern': 'keyword',
'finally': 'keyword',
'global': 'keyword',
'inherit': 'keyword',
'inline': 'keyword',
'interface': 'keyword',
'internal': 'keyword',
'lazy': 'keyword',
'let!': 'keyword',
'member' : 'keyword',
'module': 'keyword',
'namespace': 'keyword',
'new': 'keyword',
'null': 'keyword',
'override': 'keyword',
'private': 'keyword',
'public': 'keyword',
'return': 'keyword',
'return!': 'keyword',
'select': 'keyword',
'static': 'keyword',
'struct': 'keyword',
'upcast': 'keyword',
'use': 'keyword',
'use!': 'keyword',
'val': 'keyword',
'when': 'keyword',
'yield': 'keyword',
'yield!': 'keyword',
'List': 'builtin',
'Seq': 'builtin',
'Map': 'builtin',
'Set': 'builtin',
'int': 'builtin',
'string': 'builtin',
'raise': 'builtin',
'failwith': 'builtin',
'not': 'builtin',
'true': 'builtin',
'false': 'builtin'
},
slashComments: true
});
});