transformer.py 文件源码

def shift_expr(self, nodelist):
        # shift_expr ('<<'|'>>' shift_expr)*
        node = self.com_node(nodelist[0])
        for i in range(2, len(nodelist), 2):
            right = self.com_node(nodelist[i])
            if nodelist[i-1][0] == token.LEFTSHIFT:
                node = LeftShift([node, right], lineno=nodelist[1][2])
            elif nodelist[i-1][0] == token.RIGHTSHIFT:
                node = RightShift([node, right], lineno=nodelist[1][2])
            else:
                raise ValueError, "unexpected token: %s" % nodelist[i-1][0]
        return node