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<!doctype html>

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<title>CodeMirror: Crystal mode</title>

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<style>

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.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}

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.cm-s-default span.cm-arrow { color: red; }

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</style>

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<a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>

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<ul>

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<li><a href="../../doc/manual.html">Manual</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="#">Crystal</a>

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</ul>

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</div>

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<h2>Crystal mode</h2>

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# Features of Crystal

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# - Ruby-inspired syntax.

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# - Statically type-checked but without having to specify the type of variables or method arguments.

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# - Be able to call C code by writing bindings to it in Crystal.

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# - Have compile-time evaluation and generation of code, to avoid boilerplate code.

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# - Compile to efficient native code.

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# A very basic HTTP server

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require "http/server"

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server = HTTP::Server.new(8080) do |request|

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HTTP::Response.ok "text/plain", "Hello world, got #{request.path}!"

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end

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puts "Listening on http://0.0.0.0:8080"

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server.listen

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module Foo

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def initialize(@foo); end

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abstract def abstract_method : String

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@[AlwaysInline]

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def with_foofoo

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with Foo.new(self) yield

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end

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struct Foo

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def initialize(@foo); end

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def hello_world

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@foo.abstract_method

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end

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end

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end

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class Bar

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include Foo

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@@foobar = 12345

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def initialize(@bar)

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super(@bar.not_nil! + 100)

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end

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macro alias_method(name, method)

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def {{ name }}(*args)

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{{ method }}(*args)

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end

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end

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def a_method

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"Hello, World"

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end

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alias_method abstract_method, a_method

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macro def show_instance_vars : Nil

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{% for var in @type.instance_vars %}

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puts "@{{ var }} = #{ @{{ var }} }"

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{% end %}

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nil

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end

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end

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class Baz < Bar; end

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lib LibC

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fun c_puts = "puts"(str : Char*) : Int

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end

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$baz = Baz.new(100)

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$baz.show_instance_vars

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$baz.with_foofoo do

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LibC.c_puts hello_world

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end

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</textarea></form>

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var editor = CodeMirror.fromTextArea(document.getElementById("code"), {

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mode: "text/x-crystal",

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matchBrackets: true,

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indentUnit: 2

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});

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</script>

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<p><strong>MIME types defined:</strong> <code>text/x-crystal</code>.</p>

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</article>

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