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#! python
#
# This module implements a special URL handler that allows selecting an
# alternate implementation provided by some backends.
#
# This file is part of pySerial. https://github.com/pyserial/pyserial
# (C) 2015 Chris Liechti <cliechti@gmx.net>
#
# SPDX-License-Identifier: BSD-3-Clause
#
# URL format: alt://port[?option[=value][&option[=value]]]
# options:
# - class=X used class named X instead of Serial
#
# example:
# use poll based implementation on Posix (Linux):
# python -m serial.tools.miniterm alt:///dev/ttyUSB0?class=PosixPollSerial
import sys
import time
import serial
try:
import urlparse
except ImportError:
import urllib.parse as urlparse
def serial_class_for_url(url):
"""extract host and port from an URL string"""
parts = urlparse.urlsplit(url)
if parts.scheme != 'alt':
raise serial.SerialException('expected a string in the form "alt://port[?option[=value][&option[=value]]]": not starting with alt:// (%r)' % (parts.scheme,))
class_name = 'Serial'
try:
for option, values in urlparse.parse_qs(parts.query, True).items():
if option == 'class':
class_name = values[0]
else:
raise ValueError('unknown option: %r' % (option,))
except ValueError as e:
raise serial.SerialException('expected a string in the form "alt://port[?option[=value][&option[=value]]]": %s' % e)
return (''.join([parts.netloc, parts.path]), getattr(serial, class_name))
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
if __name__ == '__main__':
s = serial_for_url('alt:///dev/ttyS0?class=PosixPollSerial')
print(s)
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