build-lego-model.kts

interface Component
class Detail : Component
class Model(val details: List<Component> = ArrayList()) : Component

operator fun Model.plusAssign(component: Component) {
    this.details + component
}

interface Source
class DetailSource : Source
class Packet(val content : List<Source>) : Source


val rootPacket = Packet(arrayListOf()) // пакет с другими пакетами и деталями
val rootModel = Model()

rootModel += buildModel(rootPacket)


fun buildModel(packet: Packet) : Model {
    val packets = packet.content
    val model = Model()
    for (childPacket in packets) {
        val childModel = buildModel(packet)
        model += childModel
    }
    return model
}