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import kotlin.properties.ReadOnlyProperty |
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import kotlin.reflect.KProperty |
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interface AnimatedSlide<in T, out Slide> : ReadOnlyProperty<T, Slide> { |
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val currentSlide: Slide |
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override fun getValue(thisRef: T, property: KProperty<*>) = currentSlide |
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class VarargImpl<in T, out Slide>(private vararg val slides: Slide) : AnimatedSlide<T, Slide> { |
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private var i = 0 |
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override val currentSlide: Slide get() = slides[i].also { i = (i + 1) % slides.size } |
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} |
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} |
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interface TrafficLight { |
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val currentSignal: Signal |
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fun iterate() |
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fun show() |
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abstract class Abstract(initialSignal: Signal) : TrafficLight { |
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final override var currentSignal: Signal = initialSignal |
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private set |
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override fun iterate() { |
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currentSignal = currentSignal.next |
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} |
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} |
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abstract class ConsoleWriter(initialSignal: Signal) : Abstract(initialSignal) { |
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override fun show() = currentSignal.show() |
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} |
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interface Signal { |
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val next: Signal |
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fun show() |
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abstract class Abstract(private val getNext: () -> Signal) : Signal { |
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override val next: Signal get() = getNext() |
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} |
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abstract class ConsoleWriter( |
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private val text: String, |
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next: () -> ConsoleWriter |
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) : Abstract(next) { |
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override fun show() { |
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println(text) |
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} |
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} |
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} |
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} |
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class CarConsoleWriterTrafficLight(initialSignal: Signal) : TrafficLight.ConsoleWriter(initialSignal) { |
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abstract class Signal(text: String, next: () -> Signal) : TrafficLight.Signal.ConsoleWriter(text, next) // alias |
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class GreenSignal : Signal("Green light", ::YellowSignal) |
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class YellowSignal : Signal("Yellow light", ::RedSignal) |
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class RedSignal : Signal("Red light", ::GreenSignal) |
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} |
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class PedestrianConsoleWriterTrafficLight(initialSignal: Signal) : TrafficLight.ConsoleWriter(initialSignal) { |
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abstract class Signal(next: () -> Signal) : TrafficLight.Signal.Abstract(next) |
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class GoSignal : Signal(::StopSignal) { |
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private val currentSlide by AnimatedSlide.VarargImpl( |
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"Green man goes this way", |
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"Green man goes that way" |
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) |
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override fun show() = println(currentSlide) |
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} |
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class StopSignal : Signal(::GoSignal) { |
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override fun show() = println("Red man stands still") |
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} |
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} |
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fun main() { |
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// TrafficLightIrlManager и ConsoleImpl можешь сделать сам |
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val carTrafficLight = CarConsoleWriterTrafficLight(CarConsoleWriterTrafficLight.RedSignal()) |
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val pedestrianTrafficLight = PedestrianConsoleWriterTrafficLight(PedestrianConsoleWriterTrafficLight.StopSignal()) |
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println(">Подходим мы, значит, к перекрёстку\n") |
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println(">И видим пред собой светофоры для пешехода и для машин\n") |
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println(">Светофор для машин показывал:\n") |
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carTrafficLight.show() |
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println(">Светофор для пешеходов показывал:\n") |
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pedestrianTrafficLight.show() |
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println(">Промелькнула мысль, что странно всё это, может быть светофоры сломались\n") |
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carTrafficLight.iterate() |
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println(">, но в следующее мгновение всё переключилось и мы увидели, что следующие сигналы были таковые:\n") |
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carTrafficLight.show() |
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pedestrianTrafficLight.show() |
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println(">И стали мы ждать зелёного сигнала для себя\n") |
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println(">Машинам:\n") |
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carTrafficLight.show() |
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println(">Пешеходам:\n") |
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pedestrianTrafficLight.show() |
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println(">Машинам:\n") |
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carTrafficLight.show() |
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println(">Пешеходам:\n") |
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pedestrianTrafficLight.show() |
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println(">Машинам:\n") |
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carTrafficLight.show() |
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println(">Пешеходам:\n") |
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pedestrianTrafficLight.show() |
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carTrafficLight.iterate() |
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println(">Машинам:\n") |
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carTrafficLight.show() |
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println(">Пешеходам:\n") |
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pedestrianTrafficLight.show() |
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println(">Машинам:\n") |
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carTrafficLight.show() |
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println(">Пешеходам:\n") |
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pedestrianTrafficLight.show() |
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carTrafficLight.iterate() |
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println(">Машинам:\n") |
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carTrafficLight.show() |
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println(">Пешеходам:\n") |
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pedestrianTrafficLight.show() |
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println(">Ещё чуть-чуть, подумали мы\n") |
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pedestrianTrafficLight.iterate() |
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pedestrianTrafficLight.show() |
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println(">Времени на пешеходном светофоре было указано только лишь на то чтобы дойти быстрым шагом, вот мы и поспешили\n") |
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println(">Машинам:\n") |
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carTrafficLight.show() |
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println(">Пешеходам:\n") |
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pedestrianTrafficLight.show() |
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println(">Машинам:\n") |
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carTrafficLight.show() |
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println(">Пешеходам:\n") |
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pedestrianTrafficLight.show() |
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pedestrianTrafficLight.iterate() |
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println(">Пешеходам:\n") |
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pedestrianTrafficLight.show() |
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println(">Вот мы и прошли перекрёсток\n") |
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} |
