/**
* Gets whether or not {@code a} is an ancestor of or equal to {@code b}.
*
* @param a The first tree.
* @param b The second tree.
* @return {@code true} if {@code a} is an ancestor of or is equal to {@code b}, otherwise {@code
* false}.
*/
public static boolean isAncestorOf(@NonNull ParseTree a, @NonNull ParseTree b) {
for (ParseTree current = b; current != null; current = current.getParent()) {
if (current.equals(a)) {
return true;
}
}
return false;
}
/**
* Gets next sibling of ParseTree node.
*
* @param node ParseTree node
* @return next sibling of ParseTree node.
*/
private static ParseTree getNextSibling(ParseTree node) {
ParseTree nextSibling = null;
if (node.getParent() != null) {
final ParseTree parent = node.getParent();
final int childCount = parent.getChildCount();
int index = 0;
while (true) {
final ParseTree currentNode = parent.getChild(index);
if (currentNode.equals(node)) {
if (index != childCount - 1) {
nextSibling = parent.getChild(index + 1);
}
break;
}
index++;
}
}
return nextSibling;
}