parser.py 文件源码

def parse_match_arm(self):
        left, right = [], None

        if self.cur_is(token.STAR):
            left = None
            self.next()
        else:    
            left = self.parse_expr_list(token.F_ARROW)

        self.next()

        if self.cur_is(token.LBRACE):
            right = self.parse_block_statement()
            self.next()
        else:
            right = self.parse_stmt()

        return (left, right)