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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="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a> <ul> <li><a href="../../index.html">Home</a> <li><a href="../../doc/manual.html">Manual</a> <li><a href="https://github.com/codemirror/codemirror">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 def initialize(@foo); end abstract def abstract_method : String @[AlwaysInline] def with_foofoo with Foo.new(self) yield end struct Foo def initialize(@foo); end def hello_world @foo.abstract_method end end end class Bar include Foo @@foobar = 12345 def initialize(@bar) super(@bar.not_nil! + 100) 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 macro def show_instance_vars : Nil {% for var in @type.instance_vars %} puts "@{{ var }} = #{ @{{ var }} }" {% end %} nil 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>
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