Current File : //lib/python3/dist-packages/serial/tools/list_ports_common.py
#!/usr/bin/env python
#
# This is a helper module for the various platform dependent list_port
# implementations.
#
# This file is part of pySerial. https://github.com/pyserial/pyserial
# (C) 2015 Chris Liechti <cliechti@gmx.net>
#
# SPDX-License-Identifier: BSD-3-Clause
from __future__ import absolute_import
import re
import glob
import os
import os.path
def numsplit(text):
"""\
Convert string into a list of texts and numbers in order to support a
natural sorting.
"""
result = []
for group in re.split(r'(\d+)', text):
if group:
try:
group = int(group)
except ValueError:
pass
result.append(group)
return result
class ListPortInfo(object):
"""Info collection base class for serial ports"""
def __init__(self, device, skip_link_detection=False):
self.device = device
self.name = os.path.basename(device)
self.description = 'n/a'
self.hwid = 'n/a'
# USB specific data
self.vid = None
self.pid = None
self.serial_number = None
self.location = None
self.manufacturer = None
self.product = None
self.interface = None
# special handling for links
if not skip_link_detection and device is not None and os.path.islink(device):
self.hwid = 'LINK={}'.format(os.path.realpath(device))
def usb_description(self):
"""return a short string to name the port based on USB info"""
if self.interface is not None:
return '{} - {}'.format(self.product, self.interface)
elif self.product is not None:
return self.product
else:
return self.name
def usb_info(self):
"""return a string with USB related information about device"""
return 'USB VID:PID={:04X}:{:04X}{}{}'.format(
self.vid or 0,
self.pid or 0,
' SER={}'.format(self.serial_number) if self.serial_number is not None else '',
' LOCATION={}'.format(self.location) if self.location is not None else '')
def apply_usb_info(self):
"""update description and hwid from USB data"""
self.description = self.usb_description()
self.hwid = self.usb_info()
def __eq__(self, other):
return isinstance(other, ListPortInfo) and self.device == other.device
def __hash__(self):
return hash(self.device)
def __lt__(self, other):
if not isinstance(other, ListPortInfo):
raise TypeError('unorderable types: {}() and {}()'.format(
type(self).__name__,
type(other).__name__))
return numsplit(self.device) < numsplit(other.device)
def __str__(self):
return '{} - {}'.format(self.device, self.description)
def __getitem__(self, index):
"""Item access: backwards compatible -> (port, desc, hwid)"""
if index == 0:
return self.device
elif index == 1:
return self.description
elif index == 2:
return self.hwid
else:
raise IndexError('{} > 2'.format(index))
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
def list_links(devices):
"""\
search all /dev devices and look for symlinks to known ports already
listed in devices.
"""
links = []
for device in glob.glob('/dev/*'):
if os.path.islink(device) and os.path.realpath(device) in devices:
links.append(device)
return links
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# test
if __name__ == '__main__':
print(ListPortInfo('dummy'))
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