parser.py 文件源码

def parse_concat(self):
        lineno = self.stream.current.lineno
        args = [self.parse_math2()]
        while self.stream.current.type == 'tilde':
            next(self.stream)
            args.append(self.parse_math2())
        if len(args) == 1:
            return args[0]
        return nodes.Concat(args, lineno=lineno)