You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
163 lines
4.4 KiB
163 lines
4.4 KiB
from __future__ import absolute_import, division, print_function
|
|
|
|
import platform
|
|
import sys
|
|
import types
|
|
import warnings
|
|
|
|
|
|
PY2 = sys.version_info[0] == 2
|
|
PYPY = platform.python_implementation() == "PyPy"
|
|
|
|
|
|
if PYPY or sys.version_info[:2] >= (3, 6):
|
|
ordered_dict = dict
|
|
else:
|
|
from collections import OrderedDict
|
|
|
|
ordered_dict = OrderedDict
|
|
|
|
|
|
if PY2:
|
|
from UserDict import IterableUserDict
|
|
|
|
# We 'bundle' isclass instead of using inspect as importing inspect is
|
|
# fairly expensive (order of 10-15 ms for a modern machine in 2016)
|
|
def isclass(klass):
|
|
return isinstance(klass, (type, types.ClassType))
|
|
|
|
# TYPE is used in exceptions, repr(int) is different on Python 2 and 3.
|
|
TYPE = "type"
|
|
|
|
def iteritems(d):
|
|
return d.iteritems()
|
|
|
|
# Python 2 is bereft of a read-only dict proxy, so we make one!
|
|
class ReadOnlyDict(IterableUserDict):
|
|
"""
|
|
Best-effort read-only dict wrapper.
|
|
"""
|
|
|
|
def __setitem__(self, key, val):
|
|
# We gently pretend we're a Python 3 mappingproxy.
|
|
raise TypeError(
|
|
"'mappingproxy' object does not support item assignment"
|
|
)
|
|
|
|
def update(self, _):
|
|
# We gently pretend we're a Python 3 mappingproxy.
|
|
raise AttributeError(
|
|
"'mappingproxy' object has no attribute 'update'"
|
|
)
|
|
|
|
def __delitem__(self, _):
|
|
# We gently pretend we're a Python 3 mappingproxy.
|
|
raise TypeError(
|
|
"'mappingproxy' object does not support item deletion"
|
|
)
|
|
|
|
def clear(self):
|
|
# We gently pretend we're a Python 3 mappingproxy.
|
|
raise AttributeError(
|
|
"'mappingproxy' object has no attribute 'clear'"
|
|
)
|
|
|
|
def pop(self, key, default=None):
|
|
# We gently pretend we're a Python 3 mappingproxy.
|
|
raise AttributeError(
|
|
"'mappingproxy' object has no attribute 'pop'"
|
|
)
|
|
|
|
def popitem(self):
|
|
# We gently pretend we're a Python 3 mappingproxy.
|
|
raise AttributeError(
|
|
"'mappingproxy' object has no attribute 'popitem'"
|
|
)
|
|
|
|
def setdefault(self, key, default=None):
|
|
# We gently pretend we're a Python 3 mappingproxy.
|
|
raise AttributeError(
|
|
"'mappingproxy' object has no attribute 'setdefault'"
|
|
)
|
|
|
|
def __repr__(self):
|
|
# Override to be identical to the Python 3 version.
|
|
return "mappingproxy(" + repr(self.data) + ")"
|
|
|
|
def metadata_proxy(d):
|
|
res = ReadOnlyDict()
|
|
res.data.update(d) # We blocked update, so we have to do it like this.
|
|
return res
|
|
|
|
|
|
else:
|
|
|
|
def isclass(klass):
|
|
return isinstance(klass, type)
|
|
|
|
TYPE = "class"
|
|
|
|
def iteritems(d):
|
|
return d.items()
|
|
|
|
def metadata_proxy(d):
|
|
return types.MappingProxyType(dict(d))
|
|
|
|
|
|
def import_ctypes():
|
|
"""
|
|
Moved into a function for testability.
|
|
"""
|
|
import ctypes
|
|
|
|
return ctypes
|
|
|
|
|
|
if not PY2:
|
|
|
|
def just_warn(*args, **kw):
|
|
"""
|
|
We only warn on Python 3 because we are not aware of any concrete
|
|
consequences of not setting the cell on Python 2.
|
|
"""
|
|
warnings.warn(
|
|
"Missing ctypes. Some features like bare super() or accessing "
|
|
"__class__ will not work with slots classes.",
|
|
RuntimeWarning,
|
|
stacklevel=2,
|
|
)
|
|
|
|
|
|
else:
|
|
|
|
def just_warn(*args, **kw): # pragma: nocover
|
|
"""
|
|
We only warn on Python 3 because we are not aware of any concrete
|
|
consequences of not setting the cell on Python 2.
|
|
"""
|
|
|
|
|
|
def make_set_closure_cell():
|
|
"""
|
|
Moved into a function for testability.
|
|
"""
|
|
if PYPY: # pragma: no cover
|
|
|
|
def set_closure_cell(cell, value):
|
|
cell.__setstate__((value,))
|
|
|
|
else:
|
|
try:
|
|
ctypes = import_ctypes()
|
|
|
|
set_closure_cell = ctypes.pythonapi.PyCell_Set
|
|
set_closure_cell.argtypes = (ctypes.py_object, ctypes.py_object)
|
|
set_closure_cell.restype = ctypes.c_int
|
|
except Exception:
|
|
# We try best effort to set the cell, but sometimes it's not
|
|
# possible. For example on Jython or on GAE.
|
|
set_closure_cell = just_warn
|
|
return set_closure_cell
|
|
|
|
|
|
set_closure_cell = make_set_closure_cell()
|