package traverse

type EventStage int

const (
	EventStart EventStage = iota
	EventComplete
)

type TraversalEvent struct {
	Stage     EventStage
	Result    TraversalResult
	IsResolve bool
}

type EventHandler func(TraversalEvent)

type TraverserHooks struct {
	OnEvent EventHandler
}

func (h *TraverserHooks) emit(stage EventStage, result TraversalResult, isResolve bool) {
	if h == nil || h.OnEvent == nil {
		return
	}
	h.OnEvent(TraversalEvent{
		Stage:     stage,
		Result:    result,
		IsResolve: isResolve,
	})
}