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# Copyright (c) 2015-2020 Vector 35 Inc
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to
# deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
# sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
# 2-3 compatibility
import sys
PY2 = sys.version_info[0] == 2
PY3 = sys.version_info[0] == 3
PY34 = sys.version_info[0:2] >= (3, 4)
if PY2:
def range(*args):
return xrange(*args)
def valid_import(mod_name):
import imp
try:
imp.find_module(mod_name)
found = True
except ImportError:
found = False
return found
def pyNativeStr(arg):
return arg
if PY3:
range = range # Range needs to explicitly be defined or it's an error
def valid_import(mod_name):
import importlib
mod_loader = importlib.find_loader(mod_name)
found = mod_loader is not None
return found
def pyNativeStr(arg):
if isinstance(arg, str):
return arg
else:
try:
return arg.decode('utf8')
except UnicodeDecodeError:
return arg.decode('charmap')
if PY34:
def valid_import(mod_name):
import importlib.util
return importlib.util.find_spec(mod_name) is not None
def with_metaclass(meta, *bases):
"""Create a base class with a metaclass."""
class metaclass(type):
def __new__(cls, name, this_bases, d):
return meta(name, bases, d)
@classmethod
def __prepare__(cls, name, this_bases):
return meta.__prepare__(name, bases)
return type.__new__(metaclass, 'temporary_class', (), {})
def cstr(arg):
if isinstance(arg, bytes) or arg is None:
return arg
else:
try:
return arg.encode('charmap')
except UnicodeEncodeError:
return arg.encode('utf8')
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