public Object findNode(Object ast, int offset) {
if (ast instanceof ITree) {
return TreeAdapter.locateLexical((ITree) ast, offset);
} else if (ast instanceof AbstractAST) {
return ((AbstractAST) ast).findNode(offset);
} else if (ast instanceof ModelTreeNode) {
return findNode(((ModelTreeNode) ast).getASTNode(), offset);
}
return null;
}
