1·If there are less than three args, we print a message and exit.
如果少于三个参数,则打印消息并退出。
2·The second all-strings function similarly generates a conditional visitor that looks for a concat node with all string args.
第二个all - strings函数生成了一个条件访问者,它将查找带有全部字符串参数的concat节点。
3·After scanning all option args (that is, those prefixed by a hyphen), if it finds one more arg, it takes it to be the name of the input file and tries to open it for reading.
在扫描了所有的选项参数(也就是那些以连字符为前缀的参数)后,如果selpg发现还有一个参数,则它会接受该参数为输入文件的名称并尝试打开它以进行读取。
4·Create your local address variable with the proper args.
创建你的本机地址变量并有正确的参数。