import java.io.PrintWriter;
import Instruction;

/**
 * The standard "Compare" instruction for AAAL, the amazingly abstract
 * assembly language.  Used with the Jump-if-Equal and Jump-if-not-Equal
 * instructions.
 *
 * @author Samuel A. Rebelsky
 * @version 1.0 of April 2001
 */
public class Compare
  implements Instruction
{
  // +--------+------------------------------------------------------------
  // | Fields |
  // +--------+

  /** The first thing to compare. */
  protected Location first;

  /** The second thing to compare. */
  protected Location second;

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

  /**
   * Build a new instruction to compare two values.
   */
  public Compare(Location first, Location second) {
    this.first = first;
    this.second = second;
  } // Compare(Location, Location);

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

  /**
   * Print the instruction.
   */
  public void print(PrintWriter out) {
    out.print("  CMP ");
    this.first.print(out);
    out.print(" to ");
    this.second.print(out);
    out.println();
  } // print(PrintWriter)

} // class Compare