import java.io.PrintWriter;
import Instruction;

/**
 * A label in AAAL, the amazingly abstract assembly language.
 * Listed as an instruction when it's not really, but what's a
 * little bit of semantics among friends.
 *
 * @author Samuel A. Rebelsky
 * @version 1.0 of April 2001
 */
public class Label
  implements Instruction
{
  // +--------+------------------------------------------------------------
  // | Fields |
  // +--------+

  /** The text used for the label. */
  protected String label;

  /** A count of the automatically-generated labels. */
  protected static int count = 0;

  // +--------------+------------------------------------------------------
  // | Constructors |
  // +--------------+

  /**
   * Build a new label with specified name.
   */
  public Label(String name) {
    this.label = name;
  } // Label(String)

  /**
   * Build a new label with an automatically-generated name.
   */
  public Label() {
    this("Label_" + (count++));
  } // Label()

  // +---------------------+-----------------------------------------------
  // | Instruction Methods |
  // +---------------------+

  /**
   * Print the instruction.
   */
  public void print(PrintWriter out) {
    out.println(label + ":");
  } // print(PrintWriter)

} // class Label