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"""passlib.utils.compat - python 2/3 compatibility helpers""" #============================================================================= # figure out what we're running #============================================================================= #------------------------------------------------------------------------ # python version #------------------------------------------------------------------------ import sys PY2 = sys.version_info < (3,0) PY3 = sys.version_info >= (3,0) # make sure it's not an unsupported version, even if we somehow got this far if sys.version_info < (2,6) or (3,0) <= sys.version_info < (3,2): raise RuntimeError("Passlib requires Python 2.6, 2.7, or >= 3.2 (as of passlib 1.7)") PY26 = sys.version_info < (2,7) #------------------------------------------------------------------------ # python implementation #------------------------------------------------------------------------ JYTHON = sys.platform.startswith('java') PYPY = hasattr(sys, "pypy_version_info") if PYPY and sys.pypy_version_info < (2,0): raise RuntimeError("passlib requires pypy >= 2.0 (as of passlib 1.7)") # e.g. '2.7.7\n[Pyston 0.5.1]' # NOTE: deprecated support 2019-11 PYSTON = "Pyston" in sys.version #============================================================================= # common imports #============================================================================= import logging; log = logging.getLogger(__name__) if PY3: import builtins else: import __builtin__ as builtins def add_doc(obj, doc): """add docstring to an object""" obj.__doc__ = doc #============================================================================= # the default exported vars #============================================================================= __all__ = [ # python versions 'PY2', 'PY3', 'PY26', # io 'BytesIO', 'StringIO', 'NativeStringIO', 'SafeConfigParser', 'print_', # type detection ## 'is_mapping', 'int_types', 'num_types', 'unicode_or_bytes_types', 'native_string_types', # unicode/bytes types & helpers 'u', 'unicode', 'uascii_to_str', 'bascii_to_str', 'str_to_uascii', 'str_to_bascii', 'join_unicode', 'join_bytes', 'join_byte_values', 'join_byte_elems', 'byte_elem_value', 'iter_byte_values', # iteration helpers 'irange', #'lrange', 'imap', 'lmap', 'iteritems', 'itervalues', 'next', # collections 'OrderedDict', # introspection 'get_method_function', 'add_doc', ] # begin accumulating mapping of lazy-loaded attrs, # 'merged' into module at bottom _lazy_attrs = dict() #============================================================================= # unicode & bytes types #============================================================================= if PY3: unicode = str # TODO: once we drop python 3.2 support, can use u'' again! def u(s): assert isinstance(s, str) return s unicode_or_bytes_types = (str, bytes) native_string_types = (unicode,) else: unicode = builtins.unicode def u(s): assert isinstance(s, str) return s.decode("unicode_escape") unicode_or_bytes_types = (basestring,) native_string_types = (basestring,) # shorter preferred aliases unicode_or_bytes = unicode_or_bytes_types unicode_or_str = native_string_types # unicode -- unicode type, regardless of python version # bytes -- bytes type, regardless of python version # unicode_or_bytes_types -- types that text can occur in, whether encoded or not # native_string_types -- types that native python strings (dict keys etc) can occur in. #============================================================================= # unicode & bytes helpers #============================================================================= # function to join list of unicode strings join_unicode = u('').join # function to join list of byte strings join_bytes = b''.join if PY3: def uascii_to_str(s): assert isinstance(s, unicode) return s def bascii_to_str(s): assert isinstance(s, bytes) return s.decode("ascii") def str_to_uascii(s): assert isinstance(s, str) return s def str_to_bascii(s): assert isinstance(s, str) return s.encode("ascii") join_byte_values = join_byte_elems = bytes def byte_elem_value(elem): assert isinstance(elem, int) return elem def iter_byte_values(s): assert isinstance(s, bytes) return s def iter_byte_chars(s): assert isinstance(s, bytes) # FIXME: there has to be a better way to do this return (bytes([c]) for c in s) else: def uascii_to_str(s): assert isinstance(s, unicode) return s.encode("ascii") def bascii_to_str(s): assert isinstance(s, bytes) return s def str_to_uascii(s): assert isinstance(s, str) return s.decode("ascii") def str_to_bascii(s): assert isinstance(s, str) return s def join_byte_values(values): return join_bytes(chr(v) for v in values) join_byte_elems = join_bytes byte_elem_value = ord def iter_byte_values(s): assert isinstance(s, bytes) return (ord(c) for c in s) def iter_byte_chars(s): assert isinstance(s, bytes) return s add_doc(uascii_to_str, "helper to convert ascii unicode -> native str") add_doc(bascii_to_str, "helper to convert ascii bytes -> native str") add_doc(str_to_uascii, "helper to convert ascii native str -> unicode") add_doc(str_to_bascii, "helper to convert ascii native str -> bytes") # join_byte_values -- function to convert list of ordinal integers to byte string. # join_byte_elems -- function to convert list of byte elements to byte string; # i.e. what's returned by ``b('a')[0]``... # this is b('a') under PY2, but 97 under PY3. # byte_elem_value -- function to convert byte element to integer -- a noop under PY3 add_doc(iter_byte_values, "iterate over byte string as sequence of ints 0-255") add_doc(iter_byte_chars, "iterate over byte string as sequence of 1-byte strings") #============================================================================= # numeric #============================================================================= if PY3: int_types = (int,) num_types = (int, float) else: int_types = (int, long) num_types = (int, long, float) #============================================================================= # iteration helpers # # irange - range iterable / view (xrange under py2, range under py3) # lrange - range list (range under py2, list(range()) under py3) # # imap - map to iterator # lmap - map to list #============================================================================= if PY3: irange = range ##def lrange(*a,**k): ## return list(range(*a,**k)) def lmap(*a, **k): return list(map(*a,**k)) imap = map def iteritems(d): return d.items() def itervalues(d): return d.values() def nextgetter(obj): return obj.__next__ izip = zip else: irange = xrange ##lrange = range lmap = map from itertools import imap, izip def iteritems(d): return d.iteritems() def itervalues(d): return d.itervalues() def nextgetter(obj): return obj.next add_doc(nextgetter, "return function that yields successive values from iterable") #============================================================================= # typing #============================================================================= ##def is_mapping(obj): ## # non-exhaustive check, enough to distinguish from lists, etc ## return hasattr(obj, "items") #============================================================================= # introspection #============================================================================= if PY3: method_function_attr = "__func__" else: method_function_attr = "im_func" def get_method_function(func): """given (potential) method, return underlying function""" return getattr(func, method_function_attr, func) def get_unbound_method_function(func): """given unbound method, return underlying function""" return func if PY3 else func.__func__ def suppress_cause(exc): """ backward compat hack to suppress exception cause in python3.3+ one python < 3.3 support is dropped, can replace all uses with "raise exc from None" """ exc.__cause__ = None return exc #============================================================================= # input/output #============================================================================= if PY3: _lazy_attrs = dict( BytesIO="io.BytesIO", UnicodeIO="io.StringIO", NativeStringIO="io.StringIO", SafeConfigParser="configparser.ConfigParser", ) print_ = getattr(builtins, "print") else: _lazy_attrs = dict( BytesIO="cStringIO.StringIO", UnicodeIO="StringIO.StringIO", NativeStringIO="cStringIO.StringIO", SafeConfigParser="ConfigParser.SafeConfigParser", ) def print_(*args, **kwds): """The new-style print function.""" # extract kwd args fp = kwds.pop("file", sys.stdout) sep = kwds.pop("sep", None) end = kwds.pop("end", None) if kwds: raise TypeError("invalid keyword arguments") # short-circuit if no target if fp is None: return # use unicode or bytes ? want_unicode = isinstance(sep, unicode) or isinstance(end, unicode) or \ any(isinstance(arg, unicode) for arg in args) # pick default end sequence if end is None: end = u("\n") if want_unicode else "\n" elif not isinstance(end, unicode_or_bytes_types): raise TypeError("end must be None or a string") # pick default separator if sep is None: sep = u(" ") if want_unicode else " " elif not isinstance(sep, unicode_or_bytes_types): raise TypeError("sep must be None or a string") # write to buffer first = True write = fp.write for arg in args: if first: first = False else: write(sep) if not isinstance(arg, basestring): arg = str(arg) write(arg) write(end) #============================================================================= # collections #============================================================================= if PY26: _lazy_attrs['OrderedDict'] = 'passlib.utils.compat._ordered_dict.OrderedDict' else: _lazy_attrs['OrderedDict'] = 'collections.OrderedDict' #============================================================================= # lazy overlay module #============================================================================= from types import ModuleType def _import_object(source): """helper to import object from module; accept format `path.to.object`""" modname, modattr = source.rsplit(".",1) mod = __import__(modname, fromlist=[modattr], level=0) return getattr(mod, modattr) class _LazyOverlayModule(ModuleType): """proxy module which overlays original module, and lazily imports specified attributes. this is mainly used to prevent importing of resources that are only needed by certain password hashes, yet allow them to be imported from a single location. used by :mod:`passlib.utils`, :mod:`passlib.crypto`, and :mod:`passlib.utils.compat`. """ @classmethod def replace_module(cls, name, attrmap): orig = sys.modules[name] self = cls(name, attrmap, orig) sys.modules[name] = self return self def __init__(self, name, attrmap, proxy=None): ModuleType.__init__(self, name) self.__attrmap = attrmap self.__proxy = proxy self.__log = logging.getLogger(name) def __getattr__(self, attr): proxy = self.__proxy if proxy and hasattr(proxy, attr): return getattr(proxy, attr) attrmap = self.__attrmap if attr in attrmap: source = attrmap[attr] if callable(source): value = source() else: value = _import_object(source) setattr(self, attr, value) self.__log.debug("loaded lazy attr %r: %r", attr, value) return value raise AttributeError("'module' object has no attribute '%s'" % (attr,)) def __repr__(self): proxy = self.__proxy if proxy: return repr(proxy) else: return ModuleType.__repr__(self) def __dir__(self): attrs = set(dir(self.__class__)) attrs.update(self.__dict__) attrs.update(self.__attrmap) proxy = self.__proxy if proxy is not None: attrs.update(dir(proxy)) return list(attrs) # replace this module with overlay that will lazily import attributes. _LazyOverlayModule.replace_module(__name__, _lazy_attrs) #============================================================================= # eof #=============================================================================