2019-07-28 14:57:52 +02:00
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<!doctype html>
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<title>CodeMirror: Crystal mode</title>
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<meta charset="utf-8"/>
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<link rel=stylesheet href="../../doc/docs.css">
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<link rel="stylesheet" href="../../lib/codemirror.css">
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<script src="../../lib/codemirror.js"></script>
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<script src="../../addon/edit/matchbrackets.js"></script>
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<script src="crystal.js"></script>
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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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<div id=nav>
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2020-10-02 13:05:50 +02:00
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<a href="https://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png" alt=""></a>
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2019-07-28 14:57:52 +02:00
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<ul>
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<li><a href="../../index.html">Home</a>
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<li><a href="../../doc/manual.html">Manual</a>
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<li><a href="https://github.com/codemirror/codemirror">Code</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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<article>
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<h2>Crystal mode</h2>
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<form><textarea id="code" name="code">
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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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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 : ::Foo)
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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 : Int32)
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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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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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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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<script>
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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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