public TreeElement addInternal(TreeElement first, ASTNode last, ASTNode anchor, Boolean beforeB) {
TreeElement firstAppended = null;
boolean before = beforeB == null || beforeB.booleanValue();
try {
TreeElement next;
do {
next = first.getTreeNext();
if (firstAppended == null) {
firstAppended = addInternal(first, anchor, before);
anchor = firstAppended;
} else {
anchor = addInternal(first, anchor, false);
}
} while (first != last && (first = next) != null);
} catch (IncorrectOperationException ignored) {
} finally {
clearCaches();
}
return firstAppended;
}
