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"""
Implementation helper: a struct that looks like a tuple. See timemodule
and posixmodule for example uses.
"""
from __pypy__ import hidden_applevel
make_none = lambda self: None
class structseqfield(object):
"""Definition of field of a structseq. The 'index' is for positional
tuple-like indexing. Fields whose index is after a gap in the numbers
cannot be accessed like this, but only by name.
"""
__name__ = "?"
def __init__(self, index, doc=None, default=None):
# these attributes should not be overwritten after setting them for the
# first time, to make them immutable
# self.__name__ is set later
self.index = index
# self.is_positional = True/False, set later
self.__doc__ = doc
if default: # also written below
self._default = default
def __repr__(self):
return '<field %s (%s)>' % (self.__name__,
self.__doc__ or 'undocumented')
@hidden_applevel
def __get__(self, obj, typ=None):
if obj is None:
return self
if not self.is_positional:
return obj.__dict__[self.__name__]
else:
return obj[self.index]
def __set__(self, obj, value):
raise AttributeError("readonly attribute")
class structseqtype(type):
def __new__(metacls, classname, bases, dict):
assert not bases
fields_by_index = {}
for name, field in dict.items():
if isinstance(field, structseqfield):
assert field.index not in fields_by_index
fields_by_index[field.index] = field
field.__name__ = name
dict['n_fields'] = len(fields_by_index)
extra_fields = sorted(fields_by_index.items())
n_sequence_fields = 0
sequence_fields = []
while extra_fields and extra_fields[0][0] == n_sequence_fields:
num, field = extra_fields.pop(0)
field.is_positional = True
assert not hasattr(field, "_default")
sequence_fields.append(field.__name__)
n_sequence_fields += 1
dict['n_sequence_fields'] = n_sequence_fields
dict['n_unnamed_fields'] = 0 # no fully anonymous fields in PyPy
extra_fields = [field for index, field in extra_fields]
for field in extra_fields:
field.is_positional = False
if not hasattr(field, "_default"):
field._default = make_none
dict['_extra_fields'] = tuple(extra_fields)
if '__new__' not in dict:
dict['__new__'] = structseq_new
dict['__reduce__'] = structseq_reduce
dict['__setattr__'] = structseq_setattr
dict['__repr__'] = structseq_repr
dict['__str__'] = structseq_repr
dict['_name'] = dict.get('name', classname)
dict['__match_args__'] = tuple(sequence_fields)
return type.__new__(metacls, classname, (tuple,), dict)
builtin_dict = dict
MISSING = object()
@hidden_applevel
def structseq_new(cls, sequence, dict=MISSING):
if dict is MISSING:
dict = {}
elif not isinstance(dict, builtin_dict):
raise TypeError(cls._name + " takes a dict as second arg, if any")
N = cls.n_sequence_fields
# total fields (unnamed are not yet supported, extra fields not included)
if N == 1:
sequence = tuple([sequence])
else:
sequence = tuple(sequence)
if len(sequence) < N:
if N < cls.n_fields:
msg = "at least"
else:
msg = "exactly"
raise TypeError("expected a sequence with %s %d items. has %d" % (
msg, N, len(sequence)))
if len(sequence) > N:
if len(sequence) > cls.n_fields:
if N < cls.n_fields:
msg = "at most"
else:
msg = "exactly"
raise TypeError("expected a sequence with %s %d items. has %d" \
% (msg, cls.n_fields, len(sequence)))
result = tuple.__new__(cls, sequence[:N])
difference = len(sequence) - N
for i in range(len(sequence) - N):
name = cls._extra_fields[i].__name__
if name in dict:
raise TypeError("duplicate value for %r" % (name,))
result.__dict__[name] = sequence[N + i]
startindex = len(sequence) - N
if startindex == len(cls._extra_fields):
return result
else:
result = tuple.__new__(cls, sequence)
startindex = 0
for i in range(startindex, len(cls._extra_fields)):
field = cls._extra_fields[i]
name = field.__name__
try:
value = dict[name]
except KeyError:
value = field._default(result)
result.__dict__[name] = value
return result
def structseq_reduce(self):
return type(self), (tuple(self), self.__dict__)
def structseq_setattr(self, attr, value):
if attr not in type(self).__dict__:
raise AttributeError("%r object has no attribute %r" % (
self.__class__.__name__, attr))
else:
raise AttributeError("readonly attribute")
def structseq_repr(self):
fields = {}
for field in type(self).__dict__.values():
if isinstance(field, structseqfield):
fields[field.index] = field
parts = ["%s=%r" % (fields[index].__name__, value)
for index, value in enumerate(self)]
return "%s(%s)" % (self._name, ", ".join(parts))
class SimpleNamespace:
"""A simple attribute-based namespace.
SimpleNamespace(**kwargs)"""
def __init__(self, **kwargs):
self.__dict__.update(kwargs)
def __repr__(self):
ident = id(self)
if ident in sns_recurse:
return "namespace(...)"
sns_recurse.add(ident)
try:
pairs = ('%s=%r' % item for item in sorted(self.__dict__.items()))
return "namespace(%s)" % ', '.join(pairs)
finally:
sns_recurse.discard(ident)
def __eq__(self, other):
if issubclass(type(other), SimpleNamespace):
return self.__dict__ == other.__dict__
return NotImplemented
def __ne__(self, other):
if issubclass(type(other), SimpleNamespace):
return self.__dict__ != other.__dict__
return NotImplemented
sns_recurse = set()
# This class is not exposed in sys, but by the types module.
SimpleNamespace.__module__ = 'types'
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