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# -*- coding: utf-8 -*-
#
# Copyright (c) 2010 Red Hat, Inc
#
# kitchen is free software; you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation; either version 2.1 of the License, or (at your option)
# any later version.
#.
# kitchen is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
# more details.
#.
# You should have received a copy of the GNU Lesser General Public License
# along with kitchen; if not, see <http://www.gnu.org/licenses/>
#
# Authors:
# Toshio Kuratomi <toshio@fedoraproject.org>
# Luke Macken <lmacken@redhat.com>
#
# Portions of code taken from python-fedora fedora/iterutils.py
'''
Functions to manipulate iterables
.. versionadded:: Kitchen: 0.2.1a1
.. moduleauthor:: Toshio Kuratomi <toshio@fedoraproject.org>
.. moduleauthor:: Luke Macken <lmacken@redhat.com>
'''
from kitchen.versioning import version_tuple_to_string
__version_info__ = ((0, 0, 1),)
__version__ = version_tuple_to_string(__version_info__)
def isiterable(obj, include_string=False):
'''Check whether an object is an iterable
:arg obj: Object to test whether it is an iterable
:kwarg include_string: If :data:`True` and :attr:`obj` is a byte
:class:`str` or :class:`unicode` string this function will return
:data:`True`. If set to :data:`False`, byte :class:`str` and
:class:`unicode` strings will cause this function to return
:data:`False`. Default :data:`False`.
:returns: :data:`True` if :attr:`obj` is iterable, otherwise
:data:`False`.
'''
if include_string or not isinstance(obj, basestring):
try:
iter(obj)
except TypeError:
return False
else:
return True
return False
def iterate(obj, include_string=False):
'''Generator that can be used to iterate over anything
:arg obj: The object to iterate over
:kwarg include_string: if :data:`True`, treat strings as iterables.
Otherwise treat them as a single scalar value. Default :data:`False`
This function will create an iterator out of any scalar or iterable. It
is useful for making a value given to you an iterable before operating on it.
Iterables have their items returned. scalars are transformed into iterables.
A string is treated as a scalar value unless the :attr:`include_string`
parameter is set to :data:`True`. Example usage::
>>> list(iterate(None))
[None]
>>> list(iterate([None]))
[None]
>>> list(iterate([1, 2, 3]))
[1, 2, 3]
>>> list(iterate(set([1, 2, 3])))
[1, 2, 3]
>>> list(iterate(dict(a='1', b='2')))
['a', 'b']
>>> list(iterate(1))
[1]
>>> list(iterate(iter([1, 2, 3])))
[1, 2, 3]
>>> list(iterate('abc'))
['abc']
>>> list(iterate('abc', include_string=True))
['a', 'b', 'c']
'''
if isiterable(obj, include_string=include_string):
for item in obj:
yield item
else:
yield obj
__all__ = ('isiterable', 'iterate',)
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