simple interactive test for completing parser

App.scala

object CompletingParserTestApp extends TestParser with App {
  println( "Type something and hit enter" );

  var input = ""
  do {
    input = readLine();
    parseAll( propertyPath, input ) match {
      case s : Success[Any] => println ( "valid, parsed as "+ s.get)
      case MissingCompletionOrFailure( completions, msg, in)
          => if ( completions.isEmpty )
                println( msg )
             else {
                println( "possible completions: ");
                for ( c <- completions ) println( input + c )
             }
    }
  }
  while ( input != "" )
}