repeatcommandnode.java

《深入浅出设计模式》的完整源代码

package littlecompiler;
//重复命令类，相应的文法为:<repeat command> ::= REPEAT <number> <command list>
public class RepeatCommandNode implements Node {
  private int number;
  private Node commandListNode;
  public void parse (Context context) {
    context.skipToken ("REPEAT");
    number = context.currentNumber ();
    context.nextToken ();
    commandListNode = new CommandListNode ();
    commandListNode.parse (context);
  }
  public void execute () {
    for (int i = 0; i < number; i++)
      commandListNode.execute ();
  }
  public String toString () {
    return "[REPEAT " + number + " " + commandListNode + "]";
  }
}