/usr/share/pyshared/pybridge/enum.py is in pybridge-common 0.3.0-7.2.
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# enum.py
# Part of enum, a package providing enumerated types for Python.
#
# Copyright © 2006 Ben Finney
# This is free software; you may copy, modify and/or distribute this work
# under the terms of the GNU General Public License, version 2 or later
# or, at your option, the terms of the Python license.
"""Robust enumerated type support in Python
This package provides a module for robust enumerations in Python.
An enumeration object is created with a sequence of string arguments
to the Enum() constructor::
>>> from enum import Enum
>>> Colours = Enum('red', 'blue', 'green')
>>> Weekdays = Enum('mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun')
The return value is an immutable sequence object with a value for each
of the string arguments. Each value is also available as an attribute
named from the corresponding string argument::
>>> pizza_night = Weekdays[4]
>>> shirt_colour = Colours.green
The values are constants that can be compared only with values from
the same enumeration; comparison with other values will invoke
Python's fallback comparisons::
>>> pizza_night == Weekdays.fri
True
>>> shirt_colour > Colours.red
True
>>> shirt_colour == "green"
False
Each value from an enumeration exports its sequence index
as an integer, and can be coerced to a simple string matching the
original arguments used to create the enumeration::
>>> str(pizza_night)
'fri'
>>> shirt_colour.index
2
"""
__author_name__ = "Ben Finney"
__author_email__ = "ben+python@benfinney.id.au"
__author__ = "%s <%s>" % (__author_name__, __author_email__)
__date__ = "2006-10-13"
__copyright__ = "Copyright © %s %s" % (
__date__.split('-')[0], __author_name__
)
__license__ = "Choice of GPL or Python license"
__url__ = "http://cheeseshop.python.org/pypi/enum/"
__version__ = "0.4.2"
class EnumException(Exception):
""" Base class for all exceptions in this module """
def __init__(self):
if self.__class__ is EnumException:
raise NotImplementedError, \
"%s is an abstract class for subclassing" % self.__class__
class EnumEmptyError(AssertionError, EnumException):
""" Raised when attempting to create an empty enumeration """
def __str__(self):
return "Enumerations cannot be empty"
class EnumBadKeyError(TypeError, EnumException):
""" Raised when creating an Enum with non-string keys """
def __init__(self, key):
self.key = key
def __str__(self):
return "Enumeration keys must be strings: %s" % (self.key,)
class EnumImmutableError(TypeError, EnumException):
""" Raised when attempting to modify an Enum """
def __init__(self, *args):
self.args = args
def __str__(self):
return "Enumeration does not allow modification"
class EnumValue(object):
""" A specific value of an enumerated type """
def __init__(self, enumtype, index, key):
""" Set up a new instance """
self.__enumtype = enumtype
self.__index = index
self.__key = key
def __get_enumtype(self):
return self.__enumtype
enumtype = property(__get_enumtype)
def __get_key(self):
return self.__key
key = property(__get_key)
def __str__(self):
return "%s" % (self.key)
def __get_index(self):
return self.__index
index = property(__get_index)
def __repr__(self):
return "EnumValue(%s, %s, %s)" % (
repr(self.__enumtype),
repr(self.__index),
repr(self.__key),
)
def __hash__(self):
return hash(self.__index)
def __cmp__(self, other):
result = NotImplemented
self_type = self.enumtype
try:
assert self_type == other.enumtype
result = cmp(self.index, other.index)
except (AssertionError, AttributeError):
result = NotImplemented
return result
class Enum(object):
""" Enumerated type """
def __init__(self, *keys, **kwargs):
""" Create an enumeration instance """
value_type = kwargs.get('value_type', EnumValue)
if not keys:
raise EnumEmptyError()
keys = tuple(keys)
values = [None] * len(keys)
for i, key in enumerate(keys):
value = value_type(self, i, key)
values[i] = value
try:
super(Enum, self).__setattr__(key, value)
except TypeError, e:
raise EnumBadKeyError(key)
super(Enum, self).__setattr__('_keys', keys)
super(Enum, self).__setattr__('_values', values)
def __setattr__(self, name, value):
raise EnumImmutableError(name)
def __delattr__(self, name):
raise EnumImmutableError(name)
def __len__(self):
return len(self._values)
def __getitem__(self, index):
return self._values[index]
def __setitem__(self, index, value):
raise EnumImmutableError(index)
def __delitem__(self, index):
raise EnumImmutableError(index)
def __iter__(self):
return iter(self._values)
def __contains__(self, value):
is_member = False
if isinstance(value, basestring):
is_member = (value in self._keys)
else:
try:
is_member = (value in self._values)
except EnumValueCompareError, e:
is_member = False
return is_member
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