RewriteRuleExample for Scala XML

output.txt

<document>
    <people><person name="John" id="john"/><person name="Mary" id="mary"/></people>
    <text>Hello <a href="john">John</a>, say hi to <a href="mary">Mary</a></text>
</document>

RewriteRuleExample.scala

import scala.xml._
import scala.xml.transform._

object RewriteRuleExample extends App {

  val xml = 
<document>
    <people><person name="John" id="john"/><person name="Mary" id="mary"/></people>
    <text>Hello John, say hi to Mary</text>
</document>

  val persons = xml \\ "person"

  def doReplace(textIn: Node) = {
    var text = textIn.text
    for {
      person <- persons
      name = person \ "@name"
      id = person \ "@id"
    } text = text.replace(name text, <a href={id}>{name}</a> toString)
    Unparsed(text)
  }

  object Handle extends RewriteRule {
    override def transform(n: Node) = n match {
      case text @ <text>{x}</text>  => text.asInstanceOf[Elem].copy(child=doReplace(x))
      case _ => n
    }
  }

  println(new RuleTransformer(Handle)(xml))

}