package vm

type Output interface {
	Write(message string) error
}

type EmptyOutput struct{}

func NewEmptyOutput() *EmptyOutput {
	return &EmptyOutput{}
}

func (o *EmptyOutput) Write(message string) error {
	return nil
}

type GatheringOutput struct {
	messages []string
}

func NewGatheringOutput() *GatheringOutput {
	return &GatheringOutput{
		messages: make([]string, 0, 8),
	}
}

func (o *GatheringOutput) Messages() []string {
	return o.messages
}

func (o *GatheringOutput) Write(message string) error {
	o.messages = append(o.messages, message)
	return nil
}

type ConsoleOutput struct{}

func NewConsoleOutput() *ConsoleOutput {
	return &ConsoleOutput{}
}

func (o *ConsoleOutput) Write(message string) error {
	println(message)
	return nil
}