Current File : //snap/core20/2379/lib/python3/dist-packages/urwid/compat.py
#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# Urwid python compatibility definitions
# Copyright (C) 2011 Ian Ward
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Urwid web site: http://excess.org/urwid/
from __future__ import division, print_function
import sys
try: # python 2.4 and 2.5 compat
bytes = bytes
except NameError:
bytes = str
PYTHON3 = sys.version_info > (3, 0)
# for iterating over byte strings:
# ord2 calls ord in python2 only
# chr2 converts an ordinal value to a length-1 byte string
# B returns a byte string in all supported python versions
# bytes3 creates a byte string from a list of ordinal values
if PYTHON3:
ord2 = lambda x: x
chr2 = lambda x: bytes([x])
B = lambda x: x.encode('iso8859-1')
bytes3 = bytes
text_type = str
xrange = range
text_types = (str,)
def reraise(tp, value, tb=None):
"""
Reraise an exception.
Taken from "six" library (https://pythonhosted.org/six/).
"""
try:
if value is None:
value = tp()
if value.__traceback__ is not tb:
raise value.with_traceback(tb)
raise value
finally:
value = None
tb = None
else:
ord2 = ord
chr2 = chr
B = lambda x: x
bytes3 = lambda x: bytes().join([chr(c) for c in x])
text_type = unicode
xrange = xrange
text_types = (str, unicode)
"""
Reraise an exception.
Taken from "six" library (https://pythonhosted.org/six/).
"""
def exec_(_code_, _globs_=None, _locs_=None):
"""Execute code in a namespace."""
if _globs_ is None:
frame = sys._getframe(1)
_globs_ = frame.f_globals
if _locs_ is None:
_locs_ = frame.f_locals
del frame
elif _locs_ is None:
_locs_ = _globs_
exec("""exec _code_ in _globs_, _locs_""")
exec_("""def reraise(tp, value, tb=None):
try:
raise tp, value, tb
finally:
tb = None
""")
def with_metaclass(meta, *bases):
"""
Create a base class with a metaclass.
Taken from "six" library (https://pythonhosted.org/six/).
"""
# This requires a bit of explanation: the basic idea is to make a dummy
# metaclass for one level of class instantiation that replaces itself with
# the actual 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', (), {})
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