gistfile1.txt

trait XmlRenderer {
  val handlers = Map(
    "span" -> ((n: Node) => 
      <handled>
        <div class="boink">
          {n.label}
        </div>
      </handled>
      )
  )
  
  def render(xml: Node, depth: Int): NodeSeq = xml.child.map((n) => {
    processNode(n) match {
      case Some(node) => node
      case None => Elem(n.prefix, n.label, n.attributes, n.scope, render(n, depth + 1):_*)
    }
  })
  
  /**
   * Process a node, resulting in a new node or not.
   */
  def processNode(n: Node): Option[Node] = n match {
    case Text(text) => Some(n)
    case _ => handlers.get(n.label) match {
      case Some(f) => Some(f(n))
      case None => None
    }
  }
}