Gecko [ paroquia-rio-de-mouro.pt ]

Name	Size	Permission	Date
__pycache__	[ DIR ]	drwxr-xr-x	2016-11-15 15:19
__init__.py	0 B	-rw-r--r--	2015-08-03 00:00
protocol_alt.py	1.65 KB	-rw-r--r--	2015-12-16 22:50
protocol_hwgrep.py	2.97 KB	-rw-r--r--	2015-12-22 22:46
protocol_loop.py	9.26 KB	-rw-r--r--	2015-12-16 22:51
protocol_rfc2217.py	269 B	-rw-r--r--	2015-12-16 23:01
protocol_socket.py	9.6 KB	-rw-r--r--	2015-12-16 23:00
protocol_spy.py	8.1 KB	-rw-r--r--	2015-12-16 22:51

Rename

#! python
#
# This module implements a special URL handler that uses the port listing to
# find ports by searching the string descriptions.
#
# This file is part of pySerial. https://github.com/pyserial/pyserial
# (C) 2011-2015 Chris Liechti <cliechti@gmx.net>
#
# SPDX-License-Identifier:    BSD-3-Clause
#
# URL format:    hwgrep://<regexp>&<option>
#
# where <regexp> is a Python regexp according to the re module
#
# violating the normal definition for URLs, the charachter `&` is used to
# separate parameters from the arguments (instead of `?`, but the question mark
# is heavily used in regexp'es)
#
# options:
# n=<N>     pick the N'th entry instead of the first one (numbering starts at 1)
# skip_busy tries to open port to check if it is busy, fails on posix as ports are not locked!

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:]
        n = 0
        test_open = False
        args = url.split('&')
        regexp = args.pop(0)
        for arg in args:
            if '=' in arg:
                option, value = arg.split('=', 1)
            else:
                option = arg
                value = None
            if option == 'n':
                # pick n'th element
                n = int(value) - 1
                if n < 1:
                    raise ValueError('option "n" expects a positive integer larger than 1: %r' % (value,))
            elif option == 'skip_busy':
                # open to test if port is available. not the nicest way..
                test_open = True
            else:
                raise ValueError('unknown option: %r' % (option,))
        # use a for loop to get the 1st element from the generator
        for port, desc, hwid in sorted(serial.tools.list_ports.grep(regexp)):
            if test_open:
                try:
                    s = serial.Serial(port)
                except serial.SerialException:
                    # it has some error, skip this one
                    continue
                else:
                    s.close()
            if n:
                n -= 1
                continue
            return port
        else:
            raise serial.SerialException('no ports found matching regexp %r' % (url,))

# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
if __name__ == '__main__':
    s = Serial(None)
    s.port = 'hwgrep://ttyS0'
    print(s)