phonebook.scala

JAVA 语言的函数式编程扩展

package phonebook ;

object phonebook {

  val labPhoneBook = 
    <phonebook>
      <descr>
        This is the <b>phonebook</b> of the 
        <a href="http://acme.org">ACME</a> corporation.
      </descr>
      <entry>
        <name>Burak</name> 
        <phone where="work">  [phone]</phone>
        <phone where="mobile">[phone]</phone>
      </entry>
    </phonebook>;

  Console.println( labPhoneBook );

  // XML is immutable - adding an element

  import scala.xml.{ Node, Text };

  def add( phonebook:Node, newEntry:Node ):Node = phonebook match {
    case <phonebook>{ ch @ _* }</phonebook> => 
            <phonebook>{ ch }{ newEntry }</phonebook>
  }

  val pb2 = 
    add( labPhoneBook, 
         <entry>
           <name>Kim</name> 
           <phone where="work">  [phone]</phone>
         </entry> );

  def main(args:Array[String]) = Console.println( pb2 );

}