- #!/usr/bin/env python
-
- # portable serial port access with python
- # this is a wrapper module for different platform implementations
- #
- # (C) 2001-2010 Chris Liechti <cliechti@gmx.net>
- # this is distributed under a free software license, see license.txt
-
- VERSION = '2.7'
-
- import sys
-
- if sys.platform == 'cli':
- from serial.serialcli import *
- else:
- import os
- # chose an implementation, depending on os
- if os.name == 'nt': #sys.platform == 'win32':
- from serial.serialwin32 import *
- elif os.name == 'posix':
- from serial.serialposix import *
- elif os.name == 'java':
- from serial.serialjava import *
- else:
- raise ImportError("Sorry: no implementation for your platform ('%s') available" % (os.name,))
-
-
- protocol_handler_packages = [
- 'serial.urlhandler',
- ]
-
- def serial_for_url(url, *args, **kwargs):
- """\
- Get an instance of the Serial class, depending on port/url. The port is not
- opened when the keyword parameter 'do_not_open' is true, by default it
- is. All other parameters are directly passed to the __init__ method when
- the port is instantiated.
-
- The list of package names that is searched for protocol handlers is kept in
- ``protocol_handler_packages``.
-
- e.g. we want to support a URL ``foobar://``. A module
- ``my_handlers.protocol_foobar`` is provided by the user. Then
- ``protocol_handler_packages.append("my_handlers")`` would extend the search
- path so that ``serial_for_url("foobar://"))`` would work.
- """
- # check remove extra parameter to not confuse the Serial class
- do_open = 'do_not_open' not in kwargs or not kwargs['do_not_open']
- if 'do_not_open' in kwargs: del kwargs['do_not_open']
- # the default is to use the native version
- klass = Serial # 'native' implementation
- # check port type and get class
- try:
- url_nocase = url.lower()
- except AttributeError:
- # it's not a string, use default
- pass
- else:
- if '://' in url_nocase:
- protocol = url_nocase.split('://', 1)[0]
- for package_name in protocol_handler_packages:
- module_name = '%s.protocol_%s' % (package_name, protocol,)
- try:
- handler_module = __import__(module_name)
- except ImportError:
- pass
- else:
- klass = sys.modules[module_name].Serial
- break
- else:
- raise ValueError('invalid URL, protocol %r not known' % (protocol,))
- else:
- klass = Serial # 'native' implementation
- # instantiate and open when desired
- instance = klass(None, *args, **kwargs)
- instance.port = url
- if do_open:
- instance.open()
- return instance