package code.instr;

import code.space.Computation;
import code.space.Space;
import code.stuff.Logger;
import code.stuff.Tracer;

/**
 * Push the register on the pre-term stack.
 *
 * @author Sergio Antoy
 * @since June 17, 2003
 */

public class Push implements Instruction {

    private Push() {}
    public final static Push singleton = new Push();

    public void execute(Computation computation) {
        if (Tracer.instruction) {
            Logger.logln(computation.getIdString() +
                    ": Push: " + Space.instance.current);
        }
        Space.instance.preTerm.push(Space.instance.current);
    }

    public String printAsTxtLoadable() { return "Push"; }
}