parser.py 文件源码

def parse_unary(self, with_filter=True):
        token_type = self.stream.current.type
        lineno = self.stream.current.lineno
        if token_type == 'sub':
            next(self.stream)
            node = nodes.Neg(self.parse_unary(False), lineno=lineno)
        elif token_type == 'add':
            next(self.stream)
            node = nodes.Pos(self.parse_unary(False), lineno=lineno)
        else:
            node = self.parse_primary()
        node = self.parse_postfix(node)
        if with_filter:
            node = self.parse_filter_expr(node)
        return node