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package bjc.utils.esodata;
import java.util.ArrayList;
public class Tape<T> {
private ArrayList<T> backing;
private int pos;
public Tape() {
backing = new ArrayList<>();
}
public T item() {
return backing.get(pos);
}
public int size() {
return backing.size();
}
public void item(T itm) {
backing.set(pos, itm);
}
public void append(T itm) {
backing.add(itm);
}
// Add an item before the current
public void insert(T itm) {
backing.add(pos, itm);
}
public T remove() {
if(pos != 0) pos -= 1;
return backing.remove(pos);
}
public void first() {
pos = 0;
}
public void last() {
pos = backing.size() - 1;
}
public boolean left() {
if(pos == 0) return false;
pos -= 1;
return true;
}
public boolean left(int amt) {
if((pos - amt) < 0) return false;
pos -= amt;
return true;
}
public boolean right() {
if(pos == (backing.size() - 1)) return false;
pos += 1;
return true;
}
public boolean right(int amt) {
if((pos + amt) >= (backing.size() - 1)) return false;
pos += amt;
return true;
}
}
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