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我有下面的数据结构，我试图返回顶级密钥（lo、eth0 或 eth1），如果它的值中递归和任意深度是给定的字符串。然后在找到字符串的第一个实例后终止搜索。

在包含任意数量的嵌套散列和数组的散列中查找键/值对这 有点类似于我正在尝试做的事情，但我无法将它映射到我自己的问题

h.find{ |k,v| break k if v.include? "number" }
 => "eth0"

h.find{ |k,v| break k if v.include? "10.0.128.26" }
 => nil
#Should return eth0

我想知道如何通常使用这样的嵌套数据结构，但我会满足于能够在特定的子哈希中专门搜索，在我的情况下是地址。

    h = \
    {"lo"=>
      {"mtu"=>"65536",
       "flags"=>["LOOPBACK", "UP", "LOWER_UP"],
       "encapsulation"=>"Loopback",
       "addresses"=>
        {"127.0.0.1"=>
          {"family"=>"inet",
           "prefixlen"=>"8",
           "netmask"=>"255.0.0.0",
           "scope"=>"Node"}},
       "state"=>"unknown"},
     "eth0"=>
      {"type"=>"eth",
       "number"=>"0",
       "mtu"=>"1500",
       "flags"=>["BROADCAST", "MULTICAST", "UP", "LOWER_UP"],
       "encapsulation"=>"Ethernet",
       "addresses"=>
        {"00:0C:29:1A:64:6A"=>{"family"=>"lladdr"},
         "10.0.128.26"=>
          {"family"=>"inet",
           "prefixlen"=>"24",
           "netmask"=>"255.255.255.0",
           "broadcast"=>"10.0.128.255",
           "scope"=>"Global"}},
       "state"=>"up",
       "arp"=>
        {"10.0.128.31"=>"00:0c:29:04:12:9a",
         "10.0.128.100"=>"00:0c:29:5b:b4:46",
         "10.0.128.30"=>"00:0c:29:05:a4:c7",
         "10.0.128.18"=>"00:0c:29:6a:3f:75",
         "10.0.128.3"=>"0c:c4:7a:c0:31:d1",
         "10.0.128.43"=>"00:0c:29:01:eb:6b",
         "10.0.128.44"=>"00:09:0f:09:00:03",
         "10.0.128.14"=>"00:0c:29:d2:15:80",
         "10.0.128.22"=>"00:0c:29:18:99:30"},
       "routes"=>
        [{"destination"=>"10.0.128.0/24",
          "family"=>"inet",
          "scope"=>"link",
          "proto"=>"kernel",
          "src"=>"10.0.128.26"}],
       "link_speed"=>10000,
       "duplex"=>"Full",
       "port"=>"Twisted Pair",
       "transceiver"=>"internal",
       "auto_negotiation"=>"off",
       "mdi_x"=>"Unknown",
       "ring_params"=>
        {"max_rx"=>4096,
         "max_rx_mini"=>0,
         "max_rx_jumbo"=>2048,
         "max_tx"=>4096,
         "current_rx"=>256,
         "current_rx_mini"=>0,
         "current_rx_jumbo"=>128,
         "current_tx"=>512}},
     "eth1"=>
      {"type"=>"eth",
       "number"=>"1",
       "mtu"=>"1500",
       "flags"=>["BROADCAST", "MULTICAST", "UP", "LOWER_UP"],
       "encapsulation"=>"Ethernet",
       "addresses"=>
        {"00:0C:29:1A:64:74"=>{"family"=>"lladdr"},
         "11.11.11.1"=>
          {"family"=>"inet",
           "prefixlen"=>"24",
           "netmask"=>"255.255.255.0",
           "broadcast"=>"11.11.11.1",
           "scope"=>"Global"}},
       "state"=>"up",
       "routes"=>
        [{"destination"=>"default", "family"=>"inet", "via"=>"11.11.11.1"},
         {"destination"=>"11.11.11.1/24",
          "family"=>"inet",
          "scope"=>"link",
          "proto"=>"kernel",
          "src"=>"11.11.11.1"}],
       "link_speed"=>10000,
       "duplex"=>"Full",
       "port"=>"Twisted Pair",
       "transceiver"=>"internal",
       "auto_negotiation"=>"off",
       "mdi_x"=>"Unknown",
       "ring_params"=>
        {"max_rx"=>4096,
         "max_rx_mini"=>0,
         "max_rx_jumbo"=>2048,
         "max_tx"=>4096,
         "current_rx"=>256,
         "current_rx_mini"=>0,
         "current_rx_jumbo"=>128,
         "current_tx"=>512}}}
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2 回答 2

3

由于您对顶级密钥感兴趣，您可以执行以下操作：

hash.find{ |k,v| break k if v.to_s.include? "10.0.128.26" }
#=> eth0

通过使用v.to_s，我们可以在哈希的字符串表示中进行搜索，也可以避免递归。

于 2017-05-04T03:31:08.533 回答
1

当您想返回顶部父键时，您可以使用提到的答案和find顶部哈希键以简单的方式完成它

#return true if find or nil
def deep_key?(obj, key)
  if obj.respond_to?(:key?) && obj.key?(key)
    true
  elsif obj.respond_to?(:each)
    r = nil
    obj.find{ |*a| r = deep_key?(a.last, key) }
    r
  end
end

key = '00:0C:29:1A:64:74'

#now you check if the provided key is a top level key or run search
h.key?(key) ? key : h.find { |k, v| deep_key?(v, key) }.first

它deep_key?是从提到的答案中修改的搜索功能，true如果找到一个键（或者nil如果没有找到）则返回。您可以在块内使用此函数Hash#find- 顶级键和他的值将是找到的结果（添加first以仅返回一个键）。

于 2017-05-04T06:41:21.947 回答