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ORPA-pyOpenRPA/WPy32-3720/python-3.7.2/Lib/site-packages/parso/_compatibility.py

104 lines
3.4 KiB

6 years ago
"""
To ensure compatibility from Python ``2.6`` - ``3.3``, a module has been
created. Clearly there is huge need to use conforming syntax.
"""
import sys
import platform
# Cannot use sys.version.major and minor names, because in Python 2.6 it's not
# a namedtuple.
py_version = int(str(sys.version_info[0]) + str(sys.version_info[1]))
# unicode function
try:
unicode = unicode
except NameError:
unicode = str
is_pypy = platform.python_implementation() == 'PyPy'
def use_metaclass(meta, *bases):
""" Create a class with a metaclass. """
if not bases:
bases = (object,)
return meta("HackClass", bases, {})
try:
encoding = sys.stdout.encoding
if encoding is None:
encoding = 'utf-8'
except AttributeError:
encoding = 'ascii'
def u(string):
"""Cast to unicode DAMMIT!
Written because Python2 repr always implicitly casts to a string, so we
have to cast back to a unicode (and we know that we always deal with valid
unicode, because we check that in the beginning).
"""
if py_version >= 30:
return str(string)
if not isinstance(string, unicode):
return unicode(str(string), 'UTF-8')
return string
try:
FileNotFoundError = FileNotFoundError
except NameError:
FileNotFoundError = IOError
def utf8_repr(func):
"""
``__repr__`` methods in Python 2 don't allow unicode objects to be
returned. Therefore cast them to utf-8 bytes in this decorator.
"""
def wrapper(self):
result = func(self)
if isinstance(result, unicode):
return result.encode('utf-8')
else:
return result
if py_version >= 30:
return func
else:
return wrapper
try:
from functools import total_ordering
except ImportError:
# Python 2.6
def total_ordering(cls):
"""Class decorator that fills in missing ordering methods"""
convert = {
'__lt__': [('__gt__', lambda self, other: not (self < other or self == other)),
('__le__', lambda self, other: self < other or self == other),
('__ge__', lambda self, other: not self < other)],
'__le__': [('__ge__', lambda self, other: not self <= other or self == other),
('__lt__', lambda self, other: self <= other and not self == other),
('__gt__', lambda self, other: not self <= other)],
'__gt__': [('__lt__', lambda self, other: not (self > other or self == other)),
('__ge__', lambda self, other: self > other or self == other),
('__le__', lambda self, other: not self > other)],
'__ge__': [('__le__', lambda self, other: (not self >= other) or self == other),
('__gt__', lambda self, other: self >= other and not self == other),
('__lt__', lambda self, other: not self >= other)]
}
roots = set(dir(cls)) & set(convert)
if not roots:
raise ValueError('must define at least one ordering operation: < > <= >=')
root = max(roots) # prefer __lt__ to __le__ to __gt__ to __ge__
for opname, opfunc in convert[root]:
if opname not in roots:
opfunc.__name__ = opname
opfunc.__doc__ = getattr(int, opname).__doc__
setattr(cls, opname, opfunc)
return cls