def GetFlagValue()

in pkg/private/helpers.py [0:0]

• 13 lines of code
• 7 McCabe index (conditional complexity)

def GetFlagValue(flagvalue, strip=True):
  """Converts a raw flag string to a useable value.

  1. Expand @filename style flags to the content of filename.
  2. Cope with Python3 strangness of sys.argv.
     sys.argv is not actually proper str types on Unix with Python3
     The bytes of the arg are each directly transcribed to the characters of
     the str. It is actually more complex than that, as described in the docs.
       https://docs.python.org/3/library/sys.html#sys.argv
       https://docs.python.org/3/library/os.html#os.fsencode
       https://www.python.org/dev/peps/pep-0383/

  Args:
    flagvalue: (str) raw flag value
    strip: (bool) Strip white space.

  Returns:
    Python2: unicode
    Python3: str
  """
  if flagvalue:
    if sys.version_info[0] < 3:
      # python2 gives us raw bytes in argv.
      flagvalue = flagvalue.decode('utf-8')
    # assertion: py2: flagvalue is unicode
    # assertion: py3: flagvalue is str, but in weird format
    if flagvalue[0] == '@':
      # Subtle: We do not want to re-encode the value here, because it
      # is encoded in the right format for file open operations.
      with open(flagvalue[1:], 'rb') as f:
        flagvalue = f.read().decode('utf-8')
    else:
      # convert fs specific encoding back to proper unicode.
      if sys.version_info[0] > 2:
        flagvalue = os.fsencode(flagvalue).decode('utf-8')

    if strip:
      return flagvalue.strip()
  return flagvalue