public extension NodeRepresentable {
  @inlinable
  func repeating(_ count: Int, separator: (any NodeRepresentable)? = nil) -> any NodeRepresentable {
    modifier(RepeatingNode(count: count, separator: separator))
  }
}

@usableFromInline
struct RepeatingNode: NodeModifier {

  @usableFromInline
  let count: Int

  @usableFromInline
  let separator: (any NodeRepresentable)?

  @usableFromInline
  init(
    count: Int,
    separator: (any NodeRepresentable)?
  ) {
    self.count = count
    self.separator = separator
  }

  @usableFromInline
  func render(_ node: any NodeRepresentable) -> any NodeRepresentable {
    let input = node.render()
    var output = input
    let separator = self.separator != nil
      ? self.separator!.render()
      : ""

    guard count > 0 else { return output }

    var count = count - 1
    while count > 0 {
      output = "\(output)\(separator)\(input)"
      count -= 1
    }

    return output
  }
}