java命令输出解析

Question

OSX命令system_profiler SPAudioDataType给出了附录1中所示的输出

对我来说，这看起来很难解析

例如：

• 获取Speaker的Connection

grep对于^\s+Connection: (.*)$没有帮助：捕获组\1将具有Connection值，但也会为嵌套在Speaker下的非行拾取值

有趣的是，用sed解析可能更容易。e、 g.等待查看线路音频，然后是线路扬声器。。。，然后是:后面文本的regex

我可以grepMULTILINE在全文中，首先匹配Speaker，然后Connection，跳过换行符/空格

是否有一个库可以从不同缩进的文本行构建嵌套节点的对象模型

有没有一种方法可以查询类似于CSS选择器的对象模型？e、 g.Audio > Speaker > Connection > Value

我喜欢YAML考虑空格的方式，但这并不是作为YAML进行解析

用Java或Python编写的库非常适合学习

我在自己编写代码，然后我决定问：

---

 def main():
     c = 0
     with open(sys.argv[1]) as f:
         for l in (l.rstrip() for l in f):
             m = l.lstrip()
             if not m:
                 continue
             i = len(l) - len(m)
             if i < c:
               pass # Towards parent
             elif i > c:
               pass # A child
             else:
               pass # A sibling
             c = i

---

我想我需要假设第一个节点将位于缩进0，并记住所有看到的缩进级别，以便能够将一个缩进比前一级别减少的节点重新连接到其父节点，或作为嵌套级别更高的同级节点

附录1

---

Audio:

    Intel High Definition Audio:

      Audio ID: 29

        Headphone:

          Connection: Combination Output

        Speaker:

          Connection: Internal

        Line Input:

          Connection: Combination Input

        Internal Microphone:

          Connection: Internal

        S/PDIF Optical Digital Audio Input:

          Connection: Combination Input

        S/PDIF Optical Digital Audio Output:

          Connection: Combination Output

        External Microphone / iPhone Headset:

          Connection: Combination Output

        HDMI / DisplayPort Output:

          Connection: Display

    Devices:

        Built-in Microphone:

          Default Input Device: Yes
          Input Channels: 2
          Manufacturer: Apple Inc.
          Current SampleRate: 44100
          Transport: Built-in

        Built-in Input:

          Input Channels: 2
          Manufacturer: Apple Inc.
          Current SampleRate: 44100
          Transport: Built-in

        Built-in Output:

          Default Output Device: Yes
          Default System Output Device: Yes
          Manufacturer: Apple Inc.
          Output Channels: 2
          Current SampleRate: 44100
          Transport: Built-in

---

Answer 1

这仍然是一个“OSX管理员”问题。使用^{} flag：

system_profiler -xml SPAudioDataType

它输出一个准备好解析的pList文件

Answer 2

我为解析编写了以下代码：

import sys
import asciitree
class Node(object):
    def __init__(self, name, indent, parent):
        self.name = name
        self.indent = indent
        self.parent = parent
        self.children = []
    def add(self, child):
        self.children.append(child)
    def __str__(self):
        return self.name
def main():
    current_indent = -1
    root_node = Node('Root', current_indent, None)
    current_node = root_node
    with open(sys.argv[1]) as file_to_parse:
        for scanned_line in (l.rstrip() for l in file_to_parse):
            line_content = scanned_line.lstrip()
            if not line_content:
                continue
            indent = len(scanned_line) - len(line_content)
            while True:
              if indent > current_node.indent:
                  parent = current_node
                  break
              elif indent == current_node.indent:
                  parent = current_node.parent
                  break
              else:
                  current_node = current_node.parent
            child = Node(line_content, indent, parent)
            parent.add(child)
            current_node = child
    print(asciitree.draw_tree(root_node))

if __name__ == '__main__':
    main()

生成此对象模型：

Root
  + Audio:
     + Intel High Definition Audio:
     |  + Audio ID: 29
     |     + Headphone:
     |     |  + Connection: Combination Output
     |     + Speaker:
     |     |  + Connection: Internal
     |     + Line Input:
     |     |  + Connection: Combination Input
     |     + Internal Microphone:
     |     |  + Connection: Internal
     |     + S/PDIF Optical Digital Audio Input:
     |     |  + Connection: Combination Input
     |     + S/PDIF Optical Digital Audio Output:
     |     |  + Connection: Combination Output
     |     + External Microphone / iPhone Headset:
     |     |  + Connection: Combination Output
     |     + HDMI / DisplayPort Output:
     |        + Connection: Display
     + Devices:
        + Built-in Microphone:
        |  + Default Input Device: Yes
        |  + Input Channels: 2
        |  + Manufacturer: Apple Inc.
        |  + Current SampleRate: 44100
        |  + Transport: Built-in
        + Built-in Input:
        |  + Input Channels: 2
        |  + Manufacturer: Apple Inc.
        |  + Current SampleRate: 44100
        |  + Transport: Built-in
        + Built-in Output:
        |  + Default Output Device: Yes
        |  + Default System Output Device: Yes
        |  + Manufacturer: Apple Inc.
        |  + Output Channels: 2
        |  + Current SampleRate: 44100
        |  + Transport: Built-in
        + After Effects 11.0:
        |  + Manufacturer: Apple, Inc.
        |  + Current SampleRate: 0
        |  + Transport: Unknown
        + Prelude 1.0:
        |  + Manufacturer: Apple, Inc.
        |  + Current SampleRate: 0
        |  + Transport: Unknown
        + Premiere Pro 6.0:
           + Manufacturer: Apple, Inc.
           + Current SampleRate: 0
           + Transport: Unknown

我现在需要实现像CSS选择器这样的搜索功能

你觉得呢？不对