private String subtreeAsText(PopsIONode node, String s, Stack<Integer> x, int depth, String b) {
Integer[] y = x.toArray(new Integer[x.size()]);
StringBuffer indent = new StringBuffer();
for (int i = 0; i < depth; i++) {
indent.append(" ");
}
for (int i = 0; i < y.length; i++) {
indent.replace(2 * y[i], 2 * y[i] + 1, "|");
}
if (b.length() > 0) {
indent.replace(indent.length() - b.length(), indent.length(), b);
}
s += indent;
s += node.asText(indent.length());
s += System.getProperty("line.separator");
String subs = "";
if (node.lft >= 0) {
x.push(depth);
subs += subtreeAsText(pionodes[node.lft], "", x, depth + 1, "-");
x.pop();
subs += subtreeAsText(pionodes[node.rgt], "", x, depth + 1, "`-");
}
return s + subs;
}
