package jp.ac.kobe_u.cs.prolog.builtin;
import jp.ac.kobe_u.cs.prolog.lang.IntegerTerm;
import jp.ac.kobe_u.cs.prolog.lang.Predicate;
import jp.ac.kobe_u.cs.prolog.lang.Prolog;
import jp.ac.kobe_u.cs.prolog.lang.Term;
/**
* <code>'$get_level'/1</code><br>
*
* @author Mutsunori Banbara (banbara@kobe-u.ac.jp)
* @author Naoyuki Tamura (tamura@kobe-u.ac.jp)
* @version 1.0
*/
public class PRED_$get_level_1 extends Predicate {
/**
*
*/
private static final long serialVersionUID = -7887964772753161151L;
private Term arg1;
public PRED_$get_level_1(Term a1, Predicate cont) {
arg1 = a1;
this.cont = cont;
}
public PRED_$get_level_1() {
}
@Override
public void setArgument(Term[] args, Predicate cont) {
arg1 = args[0];
this.cont = cont;
}
@Override
public int arity() {
return 1;
}
@Override
public String toString() {
return "$get_level(" + arg1 + ")";
}
@Override
public Predicate exec(Prolog engine) {
// engine.setB0();
Term a1;
a1 = arg1;
if (!a1.unify(new IntegerTerm(engine.B0), engine.trail)) {
return engine.fail();
}
return cont;
}
}