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