object_template_as_function.rb

require 'v8'
include V8::C

print = FunctionTemplate::New() do |arguments|
  for i in 0..arguments.Length() - 1
    print case arg = arguments[i]
    when TrueClass,FalseClass, nil
      arg
    else
      arg.ToString().AsciiValue()
    end
  end
  puts
end

template = ObjectTemplate::New()
template.SetCallAsFunctionHandler() do |arguments|
  V8::C::Object::New()
end

context = Context::New()
context.Enter()
context.Global().Set("Foo", template.NewInstance())
context.Global().Set("print", print.GetFunction())
TryCatch.try do |try_catch|
  script = Script::Compile(<<-JS, "<eval>")
  Foo.prototype = {bar: 'baz'}
  var f = new Foo()
  print("foo: ", Foo) //=> [object Object], should be function Foo() {}.
  print("typeof Foo: ", typeof Foo) //=> 'object', should be 'function'
  print("f.constructor == Foo: ", f.constructor == Foo) //=> false, should be true
  print("f.bar: ", f.bar) //=> undefined, should be 'baz'
  print("f instanceof Foo", f instanceof Foo) //=> TypeError: Expecting a function in instanceof check, but got #<an Object>
JS
  result = script.Run()
  if try_catch.HasCaught()
    msg = try_catch.Message()
    puts msg.Get().AsciiValue() + ": #{msg.GetLineNumber()}"
  end
end
context.Exit()