constant.java

23种设计模式JAVA实现,很好很有用的东西.

package inter;
import lexer.*; import symbols.*;

public class Constant extends Expr {

   public Constant(Token tok, Type p) { super(tok, p); }
   public Constant(int i) { super(new Num(i), Type.Int); }

   public static final Constant
      True  = new Constant(Word.True,  Type.Bool),
      False = new Constant(Word.False, Type.Bool);

   public void jumping(int t, int f) {
      if ( this == True && t != 0 ) emit("goto L" + t);
      else if ( this == False && f != 0) emit("goto L" + f);
   }
}