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1 <!doctype html>
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2
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3 <title>CodeMirror: Crystal 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="crystal.js"></script>
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11 <style>
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12 .CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}
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13 .cm-s-default span.cm-arrow { color: red; }
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14 </style>
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15
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16 <div id=nav>
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17 <a href="https://codemirror.net/5"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png" alt=""></a>
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18
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19 <ul>
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20 <li><a href="../../index.html">Home</a>
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21 <li><a href="../../doc/manual.html">Manual</a>
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22 <li><a href="https://github.com/codemirror/codemirror5">Code</a>
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23 </ul>
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24 <ul>
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25 <li><a href="../index.html">Language modes</a>
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26 <li><a class=active href="#">Crystal</a>
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27 </ul>
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28 </div>
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29
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30 <article>
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31 <h2>Crystal mode</h2>
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32 <form><textarea id="code" name="code">
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33 # Features of Crystal
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34 # - Ruby-inspired syntax.
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35 # - Statically type-checked but without having to specify the type of variables or method arguments.
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36 # - Be able to call C code by writing bindings to it in Crystal.
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37 # - Have compile-time evaluation and generation of code, to avoid boilerplate code.
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38 # - Compile to efficient native code.
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39
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40 # A very basic HTTP server
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41 require "http/server"
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42
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43 server = HTTP::Server.new(8080) do |request|
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44 HTTP::Response.ok "text/plain", "Hello world, got #{request.path}!"
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45 end
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46
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47 puts "Listening on http://0.0.0.0:8080"
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48 server.listen
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49
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50 module Foo
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51 abstract def abstract_method : String
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52
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53 @[AlwaysInline]
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54 def with_foofoo
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55 with Foo.new(self) yield
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56 end
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57
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58 struct Foo
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59 def initialize(@foo : ::Foo)
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60 end
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61
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62 def hello_world
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63 @foo.abstract_method
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64 end
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65 end
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66 end
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67
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68 class Bar
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69 include Foo
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70
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71 @@foobar = 12345
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72
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73 def initialize(@bar : Int32)
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74 end
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75
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76 macro alias_method(name, method)
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77 def {{ name }}(*args)
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78 {{ method }}(*args)
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79 end
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80 end
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81
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82 def a_method
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83 "Hello, World"
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84 end
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85
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86 alias_method abstract_method, a_method
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87
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88 def show_instance_vars : Nil
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89 {% for var in @type.instance_vars %}
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90 puts "@{{ var }} = #{ @{{ var }} }"
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91 {% end %}
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92 end
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93 end
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94
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95 class Baz < Bar; end
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96
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97 lib LibC
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98 fun c_puts = "puts"(str : Char*) : Int
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99 end
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100
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101 baz = Baz.new(100)
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102 baz.show_instance_vars
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103 baz.with_foofoo do
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104 LibC.c_puts hello_world
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105 end
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106 </textarea></form>
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107 <script>
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108 var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
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109 mode: "text/x-crystal",
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110 matchBrackets: true,
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111 indentUnit: 2
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112 });
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113 </script>
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114
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115 <p><strong>MIME types defined:</strong> <code>text/x-crystal</code>.</p>
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116 </article>
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