Adjust all offsets under node

def fixup_offsets(self, new_start, node):
        """Adjust all offsets under node"""
        if hasattr(node, 'start'):
            node.start += new_start
            node.finish += new_start
        for n in node:
            if hasattr(n, 'offset'):
                if hasattr(n, 'start'):
                    n.start += new_start
                    n.finish += new_start
            else:
                self.fixup_offsets(new_start, n)
        return