问题描述

C++实现命令行功能：`ls`,`cd`,`cat`, `add`, `remove`

#题目 要求

Browse and modify a JSON data structure with ls,cd,cat, add, remove

#实现功能

• Let's say we have this address entry data structure in JSON

  {
      "entries": {
          "lilei" : {
              "age": 27,
              "mobile" : "13700000000",
              "address" : "Earth somewhere"
          },
          "hanmeimei" : {
              "age": 26,
              "mobile" : "13700000001",
              "address" : "Earth somewhere else"
          }
      }
  }
  

• start interactive command line application

  sh> ./ab

  ab> _

• use ls command to list the items in current position

  ab> ls

  ab> entries

• use cd command to go to the entry like go to a directory

  ab> cd entries

  ab> ls

  ab> lilei hanmeimei

• use cat command to display th item data

  ab> cat lilei

  ab> "lilei" : { "age": 27, "mobile" : "13700000000", "address" : "Earth somewhere" }

• use add command to add new address entry to JSON

  ab> cd entries

  ab> add

  key: xiaoming

  value: { "age": 28, "mobile" : "13700000002", "address" : "Earth somewhere too" }

  address entry added

  ab> ls

  ab> lilei hanmeimei xiaoming

  Note: the key should be identical, if trying to add duplicated key, just display an error message

• use remove command to get one or more address entries

  ab> cd entries

  ab> remove

  please give the key: xiaoming

  xiaoming was deleted from JSON

  Note: if trying to delete an non-exist key, just display an error message

• get help

  ab> !help

  then help message should be displayed, and when encoutering invalid command, help message
  should also be displayed.

• quit from the application

  ab> !quit

  sh> _