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"""
Various containers.
"""
from pprint import pformat
from .py3compat import MutableMapping
def recursion_lock(retval, lock_name = "__recursion_lock__"):
def decorator(func):
def wrapper(self, *args, **kw):
if getattr(self, lock_name, False):
return retval
setattr(self, lock_name, True)
try:
return func(self, *args, **kw)
finally:
setattr(self, lock_name, False)
wrapper.__name__ = func.__name__
return wrapper
return decorator
class Container(MutableMapping):
"""
A generic container of attributes.
Containers are the common way to express parsed data.
"""
def __init__(self, **kw):
self.__dict__ = kw
# The core dictionary interface.
def __getitem__(self, name):
return self.__dict__[name]
def __delitem__(self, name):
del self.__dict__[name]
def __setitem__(self, name, value):
self.__dict__[name] = value
def keys(self):
return self.__dict__.keys()
def __len__(self):
return len(self.__dict__.keys())
# Extended dictionary interface.
def update(self, other):
self.__dict__.update(other)
__update__ = update
def __contains__(self, value):
return value in self.__dict__
# Rich comparisons.
def __eq__(self, other):
try:
return self.__dict__ == other.__dict__
except AttributeError:
return False
def __ne__(self, other):
return not self == other
# Copy interface.
def copy(self):
return self.__class__(**self.__dict__)
__copy__ = copy
# Iterator interface.
def __iter__(self):
return iter(self.__dict__)
def __repr__(self):
return "%s(%s)" % (self.__class__.__name__, repr(self.__dict__))
def __str__(self):
return "%s(%s)" % (self.__class__.__name__, str(self.__dict__))
class FlagsContainer(Container):
"""
A container providing pretty-printing for flags.
Only set flags are displayed.
"""
@recursion_lock("<...>")
def __str__(self):
d = dict((k, self[k]) for k in self
if self[k] and not k.startswith("_"))
return "%s(%s)" % (self.__class__.__name__, pformat(d))
class ListContainer(list):
"""
A container for lists.
"""
__slots__ = ["__recursion_lock__"]
@recursion_lock("[...]")
def __str__(self):
return pformat(self)
class LazyContainer(object):
__slots__ = ["subcon", "stream", "pos", "context", "_value"]
def __init__(self, subcon, stream, pos, context):
self.subcon = subcon
self.stream = stream
self.pos = pos
self.context = context
self._value = NotImplemented
def __eq__(self, other):
try:
return self._value == other._value
except AttributeError:
return False
def __ne__(self, other):
return not (self == other)
def __str__(self):
return self.__pretty_str__()
def __pretty_str__(self, nesting = 1, indentation = " "):
if self._value is NotImplemented:
text = "<unread>"
elif hasattr(self._value, "__pretty_str__"):
text = self._value.__pretty_str__(nesting, indentation)
else:
text = str(self._value)
return "%s: %s" % (self.__class__.__name__, text)
def read(self):
self.stream.seek(self.pos)
return self.subcon._parse(self.stream, self.context)
def dispose(self):
self.subcon = None
self.stream = None
self.context = None
self.pos = None
def _get_value(self):
if self._value is NotImplemented:
self._value = self.read()
return self._value
value = property(_get_value)
has_value = property(lambda self: self._value is not NotImplemented)
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