[processor-sdk/performance-audio-sr.git] / processor_audio_sdk_1_00_00_00 / tools / pyalpha / pyalpha / serial / urlhandler / protocol_alt.py
diff --git a/processor_audio_sdk_1_00_00_00/tools/pyalpha/pyalpha/serial/urlhandler/protocol_alt.py b/processor_audio_sdk_1_00_00_00/tools/pyalpha/pyalpha/serial/urlhandler/protocol_alt.py
--- /dev/null
@@ -0,0 +1,55 @@
+#! 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
+
+try:
+ import urlparse
+except ImportError:
+ import urllib.parse as urlparse
+
+import serial
+
+
+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})'.format(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}'.format(option))
+ except ValueError as e:
+ raise serial.SerialException(
+ 'expected a string in the form '
+ '"alt://port[?option[=value][&option[=value]]]": {!r}'.format(e))
+ if not hasattr(serial, class_name):
+ raise ValueError('unknown class: {!r}'.format(class_name))
+ cls = getattr(serial, class_name)
+ if not issubclass(cls, serial.Serial):
+ raise ValueError('class {!r} is not an instance of Serial'.format(class_name))
+ return (''.join([parts.netloc, parts.path]), cls)
+
+# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+if __name__ == '__main__':
+ s = serial.serial_for_url('alt:///dev/ttyS0?class=PosixPollSerial')
+ print(s)