.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;} .cm-s-default span.cm-arrow { color: red; }
CodeMirror
Home Manual Code
Language modes Crystal
Crystal mode
# 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
var editor = CodeMirror.fromTextArea(document.getElementById("code"), { mode: "text/x-crystal", matchBrackets: true, indentUnit: 2 });
MIME types defined: text/x-crystal .