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"""Logilab common library (aka Logilab's extension to the standard library).
:type STD_BLACKLIST: tuple
:var STD_BLACKLIST: directories ignored by default by the functions in
this package which have to recurse into directories
:type IGNORED_EXTENSIONS: tuple
:var IGNORED_EXTENSIONS: file extensions that may usually be ignored
:copyright:
2000-2009 `LOGILAB S.A. <http://www.logilab.fr>`_ (Paris, FRANCE),
all rights reserved.
:contact:
http://www.logilab.org/project/logilab-common --
mailto:python-projects@logilab.org
:license:
`General Public License version 2
<http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>`_
"""
__docformat__ = "restructuredtext en"
from logilab.common.__pkginfo__ import version as __version__
STD_BLACKLIST = ('CVS', '.svn', '.hg', 'debian', 'dist', 'build')
IGNORED_EXTENSIONS = ('.pyc', '.pyo', '.elc', '~')
# set this to False if you've mx DateTime installed but you don't want your db
# adapter to use it (should be set before you got a connection)
USE_MX_DATETIME = True
class attrdict(dict):
"""A dictionary for which keys are also accessible as attributes."""
def __getattr__(self, attr):
try:
return self[attr]
except KeyError:
raise AttributeError(attr)
class dictattr(dict):
def __init__(self, proxy):
self.__proxy = proxy
def __getitem__(self, attr):
try:
return getattr(self.__proxy, attr)
except AttributeError:
raise KeyError(attr)
class nullobject(object):
def __nonzero__(self):
return False
# flatten -----
# XXX move in a specific module and use yield instead
# do not mix flatten and translate
#
# def iterable(obj):
# try: iter(obj)
# except: return False
# return True
#
# def is_string_like(obj):
# try: obj +''
# except (TypeError, ValueError): return False
# return True
#
#def is_scalar(obj):
# return is_string_like(obj) or not iterable(obj)
#
#def flatten(seq):
# for item in seq:
# if is_scalar(item):
# yield item
# else:
# for subitem in flatten(item):
# yield subitem
def flatten(iterable, tr_func=None, results=None):
"""Flatten a list of list with any level.
If tr_func is not None, it should be a one argument function that'll be called
on each final element.
:rtype: list
>>> flatten([1, [2, 3]])
[1, 2, 3]
"""
if results is None:
results = []
for val in iterable:
if isinstance(val, (list, tuple)):
flatten(val, tr_func, results)
elif tr_func is None:
results.append(val)
else:
results.append(tr_func(val))
return results
# XXX is function below still used ?
def make_domains(lists):
"""
Given a list of lists, return a list of domain for each list to produce all
combinations of possibles values.
:rtype: list
Example:
>>> make_domains(['a', 'b'], ['c','d', 'e'])
[['a', 'b', 'a', 'b', 'a', 'b'], ['c', 'c', 'd', 'd', 'e', 'e']]
"""
domains = []
for iterable in lists:
new_domain = iterable[:]
for i in range(len(domains)):
domains[i] = domains[i]*len(iterable)
if domains:
missing = (len(domains[0]) - len(iterable)) / len(iterable)
i = 0
for j in range(len(iterable)):
value = iterable[j]
for dummy in range(missing):
new_domain.insert(i, value)
i += 1
i += 1
domains.append(new_domain)
return domains
|
