Question

OS X命令system_profiler SPAudioDataType给出附录1

中显示的输出

这对我来说很难解析。

例如：

获取Connection

Speaker

对grep

^\s+Connection: (.*)$没有帮助：捕获论坛\1将具有Connection值，但也会为行而不是选择值嵌套在Speaker下。

有趣的是，使用sed解析可能更容易。例如等待看到线路音频，然后线扬声器，...，然后正则表达:之后的文本。

我可以grep MULTILINE在整篇文章中首先匹配Speaker，然后Connection，跳过换行符/空白。

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？

有没有办法查询类似于CSS选择器的对象模型？例如Audio > Speaker > Connection > Value

我喜欢YAML考虑空格的方式，但这不会解析为YAML。

Java或Python中的库非常适合学习。

我自己编码，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

我怀疑我需要假设第一个节点将处于缩进0并记住所有看到的缩进级别，以便能够重新附加减少的节点缩进与其父级的先前级别相比或作为更高级别嵌套的兄弟级别。

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“OSX管理员”的问题。使用-xml flag：

system_profiler -xml SPAudioDataType

它输出一个准备解析的pList文件。

Answer 2

我将其编码为解析：

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()

产生这个对象模型：

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..

你怎么看？不正确的？

命令输出解析

附录1

2 个答案: