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  1. import scala.xml
  2.  
  3. case class NodeID(id: Long)
  4.  
  5. abstract class Node {
  6.     def id: NodeID
  7.     def title: String
  8. }
  9.  
  10. case class HTMLNode(id: NodeID, title: String, body: xml.Elem) extends Node
  11. case class PortalNode(id: NodeID, title: String, links: Seq[NodeID]) extends Node
  12.  
  13. ////////////////////////////////////////////////////////////////////////////////
  14.  
  15. trait HTMLRenderer[N <: Node] { this: N =>
  16.     def asHTML: xml.Elem
  17. }
  18.  
  19. trait HTMLNodeHTMLRenderer extends HTMLRenderer[HTMLNode] { this: HTMLNode =>
  20.     override def asHTML = body
  21. }
  22.  
  23. trait PortalNodeHTMLRenderer extends HTMLRenderer[PortalNode] { this: PortalNode =>
  24.     override def asHTML = <ul>{for (link <- links) yield <li>{link}</li>}</ul>
  25. }
  26.  
  27. ////////////////////////////////////////////////////////////////////////////////
  28.  
  29. object Main extends App {
  30.     val htmlNode = new HTMLNode(NodeID(1), "Hello, world!", <strong>Woo!</strong>) with HTMLNodeHTMLRenderer
  31.     println(htmlNode.asHTML)
  32.  
  33.     val portalNode = new PortalNode(NodeID(1), "Hello!", Seq(NodeID(2), NodeID(3))) with PortalNodeHTMLRenderer
  34.     println(portalNode.asHTML)
  35. }
  36.  
Success #stdin #stdout 0.4s 382080KB
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Standard input is empty
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<strong>Woo!</strong>
<ul><li>NodeID(2)</li><li>NodeID(3)</li></ul>
https://ideone.com/eKWIgH
language:
Scala (scala 2.12.8)
created:
10 years ago
visibility:
public

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