properties.swift

struct Property<N> {
  typealias N = N

  func toPropertyList() -> PropertyList<N> {
    return PropertyList<N>(properties: [self])
  }
}

struct PropertyList<N>: PropertyListConvertible {
  typealias N = N
  let properties: [Property<N>]

  func toPropertyList() -> PropertyList<N> {
    return self
  }
}

protocol PropertyListConvertible {
  associatedtype N

  func toPropertyList() -> PropertyList<N>
}


protocol ComponentType {}

struct Component<N>: ComponentType {
  let id: Identifier<N>
  let properties: [Property<N>]
  let children: [ComponentType]
}

extension Component {
  static func button<P>(_ id: String, _ properties: P...) -> ComponentType
    where P: PropertyListConvertible, P.N == UIButton {
    return Component<UIButton>(id: Identifier<UIButton>(id), properties: properties.map { $0.toPropertyList() }, children: [])
  }
}