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<!doctype html>
<title>CodeMirror: Crystal 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="crystal.js"></script>
<style>
.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}
.cm-s-default span.cm-arrow { color: red; }
</style>
<div id=nav>
<a href="https://codemirror.net/5"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png" alt=""></a>
<ul>
<li><a href="../../index.html">Home</a>
<li><a href="../../doc/manual.html">Manual</a>
<li><a href="https://github.com/codemirror/codemirror5">Code</a>
</ul>
<ul>
<li><a href="../index.html">Language modes</a>
<li><a class=active href="#">Crystal</a>
</ul>
</div>
<article>
<h2>Crystal mode</h2>
<form><textarea id="code" name="code">
# Features of Crystal
# - Ruby-inspired syntax.
# - Statically type-checked but without having to specify the type of variables or method arguments.
# - Be able to call C code by writing bindings to it in Crystal.
# - Have compile-time evaluation and generation of code, to avoid boilerplate code.
# - Compile to efficient native code.
# A very basic HTTP server
require "http/server"
server = HTTP::Server.new(8080) do |request|
HTTP::Response.ok "text/plain", "Hello world, got #{request.path}!"
end
puts "Listening on http://0.0.0.0:8080"
server.listen
module Foo
abstract def abstract_method : String
@[AlwaysInline]
def with_foofoo
with Foo.new(self) yield
end
struct Foo
def initialize(@foo : ::Foo)
end
def hello_world
@foo.abstract_method
end
end
end
class Bar
include Foo
@@foobar = 12345
def initialize(@bar : Int32)
end
macro alias_method(name, method)
def {{ name }}(*args)
{{ method }}(*args)
end
end
def a_method
"Hello, World"
end
alias_method abstract_method, a_method
def show_instance_vars : Nil
{% for var in @type.instance_vars %}
puts "@{{ var }} = #{ @{{ var }} }"
{% end %}
end
end
class Baz < Bar; end
lib LibC
fun c_puts = "puts"(str : Char*) : Int
end
baz = Baz.new(100)
baz.show_instance_vars
baz.with_foofoo do
LibC.c_puts hello_world
end
</textarea></form>
<script>
var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
mode: "text/x-crystal",
matchBrackets: true,
indentUnit: 2
});
</script>
<p><strong>MIME types defined:</strong> <code>text/x-crystal</code>.</p>
</article>