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1 <!doctype html>
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2
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3 <title>CodeMirror: ML-like mode</title>
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4 <meta charset="utf-8"/>
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5 <link rel=stylesheet href="../../doc/docs.css">
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6
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7 <link rel=stylesheet href=../../lib/codemirror.css>
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8 <script src=../../lib/codemirror.js></script>
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9 <script src=../../addon/edit/matchbrackets.js></script>
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10 <script src=mllike.js></script>
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11 <style type=text/css>
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12 .CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}
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13 </style>
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14 <div id=nav>
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15 <a href="https://codemirror.net/5"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png" alt=""></a>
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16
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17 <ul>
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18 <li><a href="../../index.html">Home</a>
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19 <li><a href="../../doc/manual.html">Manual</a>
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20 <li><a href="https://github.com/codemirror/codemirror5">Code</a>
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21 </ul>
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22 <ul>
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23 <li><a href="../index.html">Language modes</a>
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24 <li><a class=active href="#">ML-like</a>
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25 </ul>
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26 </div>
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27
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28 <article>
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29 <h2>OCaml mode</h2>
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30
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31
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32 <textarea id="ocamlCode">
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33 (* Summing a list of integers *)
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34 let rec sum xs =
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35 match xs with
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36 | [] -> 0
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37 | x :: xs' -> x + sum xs'
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38
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39 (* Quicksort *)
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40 let rec qsort = function
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41 | [] -> []
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42 | pivot :: rest ->
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43 let is_less x = x < pivot in
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44 let left, right = List.partition is_less rest in
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45 qsort left @ [pivot] @ qsort right
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46
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47 (* Fibonacci Sequence *)
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48 let rec fib_aux n a b =
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49 match n with
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50 | 0 -> a
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51 | _ -> fib_aux (n - 1) (a + b) a
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52 let fib n = fib_aux n 0 1
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53
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54 (* Birthday paradox *)
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55 let year_size = 365.
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56
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57 let rec birthday_paradox prob people =
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58 let prob' = (year_size -. float people) /. year_size *. prob in
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59 if prob' < 0.5 then
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60 Printf.printf "answer = %d\n" (people+1)
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61 else
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62 birthday_paradox prob' (people+1) ;;
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63
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64 birthday_paradox 1.0 1
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65
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66 (* Church numerals *)
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67 let zero f x = x
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68 let succ n f x = f (n f x)
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69 let one = succ zero
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70 let two = succ (succ zero)
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71 let add n1 n2 f x = n1 f (n2 f x)
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72 let to_string n = n (fun k -> "S" ^ k) "0"
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73 let _ = to_string (add (succ two) two)
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74
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75 (* Elementary functions *)
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76 let square x = x * x;;
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77 let rec fact x =
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78 if x <= 1 then 1 else x * fact (x - 1);;
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79
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80 (* Automatic memory management *)
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81 let l = 1 :: 2 :: 3 :: [];;
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82 [1; 2; 3];;
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83 5 :: l;;
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84
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85 (* Polymorphism: sorting lists *)
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86 let rec sort = function
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87 | [] -> []
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88 | x :: l -> insert x (sort l)
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89
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90 and insert elem = function
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91 | [] -> [elem]
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92 | x :: l ->
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93 if elem < x then elem :: x :: l else x :: insert elem l;;
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94
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95 (* Imperative features *)
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96 let add_polynom p1 p2 =
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97 let n1 = Array.length p1
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98 and n2 = Array.length p2 in
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99 let result = Array.create (max n1 n2) 0 in
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100 for i = 0 to n1 - 1 do result.(i) <- p1.(i) done;
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101 for i = 0 to n2 - 1 do result.(i) <- result.(i) + p2.(i) done;
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102 result;;
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103 add_polynom [| 1; 2 |] [| 1; 2; 3 |];;
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104
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105 (* We may redefine fact using a reference cell and a for loop *)
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106 let fact n =
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107 let result = ref 1 in
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108 for i = 2 to n do
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109 result := i * !result
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110 done;
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111 !result;;
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112 fact 5;;
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113
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114 (* Triangle (graphics) *)
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115 let () =
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116 ignore( Glut.init Sys.argv );
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117 Glut.initDisplayMode ~double_buffer:true ();
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118 ignore (Glut.createWindow ~title:"OpenGL Demo");
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119 let angle t = 10. *. t *. t in
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120 let render () =
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121 GlClear.clear [ `color ];
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122 GlMat.load_identity ();
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123 GlMat.rotate ~angle: (angle (Sys.time ())) ~z:1. ();
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124 GlDraw.begins `triangles;
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125 List.iter GlDraw.vertex2 [-1., -1.; 0., 1.; 1., -1.];
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126 GlDraw.ends ();
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127 Glut.swapBuffers () in
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128 GlMat.mode `modelview;
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129 Glut.displayFunc ~cb:render;
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130 Glut.idleFunc ~cb:(Some Glut.postRedisplay);
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131 Glut.mainLoop ()
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132
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133 (* A Hundred Lines of Caml - http://caml.inria.fr/about/taste.en.html *)
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134 (* OCaml page on Wikipedia - http://en.wikipedia.org/wiki/OCaml *)
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135
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136 module type S = sig type t end
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137
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138 let x = {|
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139 this is a long string
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140 with many lines and stuff
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141 |}
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142
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143 let b = 0b00110
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144 let h = 0x123abcd
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145 let e = 1e-10
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146 let i = 1.
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147 let x = 30_000
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148 let o = 0o1234
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149
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150 [1; 2; 3] (* lists *)
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151
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152 1 @ 2
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153 1. +. 2.
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154 </textarea>
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155
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156 <h2>F# mode</h2>
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157 <textarea id="fsharpCode">
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158 module CodeMirror.FSharp
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159
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160 let rec fib = function
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161 | 0 -> 0
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162 | 1 -> 1
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163 | n -> fib (n - 1) + fib (n - 2)
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164
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165 type Point =
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166 {
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167 x : int
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168 y : int
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169 }
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170
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171 type Color =
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172 | Red
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173 | Green
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174 | Blue
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175
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176 [0 .. 10]
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177 |> List.map ((+) 2)
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178 |> List.fold (fun x y -> x + y) 0
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179 |> printf "%i"
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180 </textarea>
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181
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182
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183 <script>
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184 var ocamlEditor = CodeMirror.fromTextArea(document.getElementById('ocamlCode'), {
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185 mode: 'text/x-ocaml',
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186 lineNumbers: true,
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187 matchBrackets: true
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188 });
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189
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190 var fsharpEditor = CodeMirror.fromTextArea(document.getElementById('fsharpCode'), {
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191 mode: 'text/x-fsharp',
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192 lineNumbers: true,
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193 matchBrackets: true
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194 });
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195 </script>
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196
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197 <p><strong>MIME types defined:</strong> <code>text/x-ocaml</code> (OCaml) and <code>text/x-fsharp</code> (F#).</p>
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198 </article>
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