class V8::Portal::Caller

def initialize(portal)
  @portal = portal
end

def invoke(code, *args, &block)
  protect do
    code.call(*args, &block)
  end
end

def protect(*args, &block)
  @portal.v8 raw(*args, &block)
end

def raw
  begin
    yield
  rescue Exception => e
    case e
    when SystemExit, NoMemoryError
      raise e
    else
      error = V8::C::Exception::Error(V8::C::String::New(e.message))
      #TODO: This is almost certainly a crash here.
      #we need to hold onto `error` while it bubbles up the javascript stack.
      error.SetHiddenValue("TheRubyRacer::Cause", C::External::New(e))
      V8::C::ThrowException(error)
    end
  end
end