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#! python
#
# Python Serial Port Extension for Win32, Linux, BSD, Jython
# see __init__.py
#
# This module implements a special URL handler that uses the port listing to
# find ports by searching the string descriptions.
#
# (C) 2011-2015 Chris Liechti <cliechti@gmx.net>
#
# SPDX-License-Identifier: BSD-3-Clause
#
# URL format: hwgrep://regexp
import serial
import serial.tools.list_ports
try:
basestring
except NameError:
basestring = str # python 3
class Serial(serial.Serial):
"""Just inherit the native Serial port implementation and patch the port property."""
@serial.Serial.port.setter
def port(self, value):
"""translate port name before storing it"""
if isinstance(value, basestring) and value.startswith('hwgrep://'):
serial.Serial.port.__set__(self, self.from_url(value))
else:
serial.Serial.port.__set__(self, value)
def from_url(self, url):
"""extract host and port from an URL string"""
if url.lower().startswith("hwgrep://"):
url = url[9:]
# use a for loop to get the 1st element from the generator
for port, desc, hwid in serial.tools.list_ports.grep(url):
return port
else:
raise serial.SerialException('no ports found matching regexp %r' % (url,))
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
if __name__ == '__main__':
#~ s = Serial('hwgrep://ttyS0')
s = Serial(None)
s.port = 'hwgrep://ttyS0'
print(s)
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