小编Pet*_*e C的帖子

在一个大型 json 文件中，我想从嵌套列表中删除一些元素，但保留文档的整体结构。

我的示例将其输入为（但真实的输入足够大以要求流式传输）。

{
  "keep_untouched": {
    "keep_this": [
      "this",
      "list"
    ]
  },
  "filter_this":
  [
    {"keep" : "true"},
    {
      "keep": "true",
      "extra": "keeper"
    } ,
    {
      "keep": "false",
      "extra": "non-keeper"
    }
  ]
}

所需的输出仅删除了“filter_this”块的一个元素：

{
  "keep_untouched": {
    "keep_this": [
      "this",
      "list"
    ]
  },
  "filter_this":
  [
    {"keep" : "true"},
    {
      "keep": "true",
      "extra": "keeper"
    } ,
  ]
}

处理此类情况的标准方法似乎是使用“truncate_stream”来重构流对象，然后再以通常的 jq 方式过滤这些对象。具体来说，命令：

jq -nc --stream 'fromstream(1|truncate_stream(inputs))' 

提供对对象流的访问：

{"keep_this":["this","list"]}
[{"keep":"true"},{"keep":"true","extra":"keeper"}, 
 {"keep":"false","extra":"non-keeper"}]

此时很容易过滤所需的对象。但是，这会从其父对象的上下文中剥离结果，这不是我想要的。

查看流式结构：

[["keep_untouched","keep_this",0],"this"]
[["keep_untouched","keep_this",1],"list"]
[["keep_untouched","keep_this",1]]
[["keep_untouched","keep_this"]]
[["filter_this",0,"keep"],"true"]
[["filter_this",0,"keep"]]
[["filter_this",1,"keep"],"true"]
[["filter_this",1,"extra"],"keeper"]
[["filter_this",1,"extra"]]
[["filter_this",2,"keep"],"false"] …