File: six.py

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"""Utilities for writing code that runs on Python 2 and 3"""

# Copyright (c) 2010-2014 Benjamin Peterson
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

import operator
import sys
import types

__author__ = "Benjamin Peterson <benjamin@python.org>"
__version__ = "1.6.1"

# Useful for very coarse version differentiation.
PY2 = sys.version_info[0] == 2
PY3 = sys.version_info[0] == 3

if PY3:
    string_types = str,
    integer_types = int,
    class_types = type,
    text_type = str
    binary_type = bytes

    MAXSIZE = sys.maxsize
else:
    string_types = basestring,
    integer_types = (int, long)
    class_types = (type, types.ClassType)
    text_type = unicode
    binary_type = str

    if sys.platform.startswith("java"):
        # Jython always uses 32 bits.
        MAXSIZE = int((1 << 31) - 1)
    else:
        # It's possible to have sizeof(long) != sizeof(Py_ssize_t).
        class X(object):

            def __len__(self):
                return 1 << 31

        try:
            len(X())
        except OverflowError:
            # 32-bit
            MAXSIZE = int((1 << 31) - 1)
        else:
            # 64-bit
            MAXSIZE = int((1 << 63) - 1)
        del X


def _add_doc(func, doc):
    """Add documentation to a function."""
    func.__doc__ = doc


def _import_module(name):
    """Import module, returning the module after the last dot."""
    __import__(name)
    return sys.modules[name]


class _LazyDescr(object):

    def __init__(self, name):
        self.name = name

    def __get__(self, obj, tp):
        try:
            result = self._resolve()
        except ImportError:
            # See the nice big comment in MovedModule.__getattr__.
            raise AttributeError("%s could not be imported " % self.name)
        setattr(obj, self.name, result)  # Invokes __set__.
        # This is a bit ugly, but it avoids running this again.
        delattr(obj.__class__, self.name)
        return result


class MovedModule(_LazyDescr):

    def __init__(self, name, old, new=None):
        super(MovedModule, self).__init__(name)
        if PY3:
            if new is None:
                new = name
            self.mod = new
        else:
            self.mod = old

    def _resolve(self):
        return _import_module(self.mod)

    def __getattr__(self, attr):
        # It turns out many Python frameworks like to traverse sys.modules and
        # try to load various attributes. This causes problems if this is a
        # platform-specific module on the wrong platform, like _winreg on
        # Unixes. Therefore, we silently pretend unimportable modules do not
        # have any attributes. See issues #51, #53, #56, and #63 for the full
        # tales of woe.
        #
        # First, if possible, avoid loading the module just to look at __file__,
        # __name__, or __path__.
        if (attr in ("__file__", "__name__", "__path__") and self.mod not in sys.modules):
            raise AttributeError(attr)
        try:
            _module = self._resolve()
        except ImportError:
            raise AttributeError(attr)
        value = getattr(_module, attr)
        setattr(self, attr, value)
        return value


class _LazyModule(types.ModuleType):

    def __init__(self, name):
        super(_LazyModule, self).__init__(name)
        self.__doc__ = self.__class__.__doc__

    def __dir__(self):
        attrs = ["__doc__", "__name__"]
        attrs += [attr.name for attr in self._moved_attributes]
        return attrs

    # Subclasses should override this
    _moved_attributes = []


class MovedAttribute(_LazyDescr):

    def __init__(self, name, old_mod, new_mod, old_attr=None, new_attr=None):
        super(MovedAttribute, self).__init__(name)
        if PY3:
            if new_mod is None:
                new_mod = name
            self.mod = new_mod
            if new_attr is None:
                if old_attr is None:
                    new_attr = name
                else:
                    new_attr = old_attr
            self.attr = new_attr
        else:
            self.mod = old_mod
            if old_attr is None:
                old_attr = name
            self.attr = old_attr

    def _resolve(self):
        module = _import_module(self.mod)
        return getattr(module, self.attr)


class _MovedItems(_LazyModule):
    """Lazy loading of moved objects"""


_moved_attributes = [
  MovedAttribute("cStringIO", "cStringIO", "io", "StringIO"),
  MovedAttribute("filter", "itertools", "builtins", "ifilter", "filter"),
  MovedAttribute("filterfalse", "itertools", "itertools", "ifilterfalse", "filterfalse"),
  MovedAttribute("input", "__builtin__", "builtins", "raw_input", "input"),
  MovedAttribute("map", "itertools", "builtins", "imap", "map"),
  MovedAttribute("range", "__builtin__", "builtins", "xrange", "range"),
  MovedAttribute("reload_module", "__builtin__", "imp", "reload"),
  MovedAttribute("reduce", "__builtin__", "functools"),
  MovedAttribute("StringIO", "StringIO", "io"),
  MovedAttribute("UserDict", "UserDict", "collections"),
  MovedAttribute("UserList", "UserList", "collections"),
  MovedAttribute("UserString", "UserString", "collections"),
  MovedAttribute("xrange", "__builtin__", "builtins", "xrange", "range"),
  MovedAttribute("zip", "itertools", "builtins", "izip", "zip"),
  MovedAttribute("zip_longest", "itertools", "itertools", "izip_longest", "zip_longest"),
  MovedModule("builtins", "__builtin__"),
  MovedModule("configparser", "ConfigParser"),
  MovedModule("copyreg", "copy_reg"),
  MovedModule("dbm_gnu", "gdbm", "dbm.gnu"),
  MovedModule("http_cookiejar", "cookielib", "http.cookiejar"),
  MovedModule("http_cookies", "Cookie", "http.cookies"),
  MovedModule("html_entities", "htmlentitydefs", "html.entities"),
  MovedModule("html_parser", "HTMLParser", "html.parser"),
  MovedModule("http_client", "httplib", "http.client"),
  MovedModule("email_mime_multipart", "email.MIMEMultipart", "email.mime.multipart"),
  MovedModule("email_mime_text", "email.MIMEText", "email.mime.text"),
  MovedModule("email_mime_base", "email.MIMEBase", "email.mime.base"),
  MovedModule("BaseHTTPServer", "BaseHTTPServer", "http.server"),
  MovedModule("CGIHTTPServer", "CGIHTTPServer", "http.server"),
  MovedModule("SimpleHTTPServer", "SimpleHTTPServer", "http.server"),
  MovedModule("cPickle", "cPickle", "pickle"),
  MovedModule("queue", "Queue"),
  MovedModule("reprlib", "repr"),
  MovedModule("socketserver", "SocketServer"),
  MovedModule("_thread", "thread", "_thread"),
  MovedModule("tkinter", "Tkinter"),
  MovedModule("tkinter_dialog", "Dialog", "tkinter.dialog"),
  MovedModule("tkinter_filedialog", "FileDialog", "tkinter.filedialog"),
  MovedModule("tkinter_scrolledtext", "ScrolledText", "tkinter.scrolledtext"),
  MovedModule("tkinter_simpledialog", "SimpleDialog", "tkinter.simpledialog"),
  MovedModule("tkinter_tix", "Tix", "tkinter.tix"),
  MovedModule("tkinter_ttk", "ttk", "tkinter.ttk"),
  MovedModule("tkinter_constants", "Tkconstants", "tkinter.constants"),
  MovedModule("tkinter_dnd", "Tkdnd", "tkinter.dnd"),
  MovedModule("tkinter_colorchooser", "tkColorChooser", "tkinter.colorchooser"),
  MovedModule("tkinter_commondialog", "tkCommonDialog", "tkinter.commondialog"),
  MovedModule("tkinter_tkfiledialog", "tkFileDialog", "tkinter.filedialog"),
  MovedModule("tkinter_font", "tkFont", "tkinter.font"),
  MovedModule("tkinter_messagebox", "tkMessageBox", "tkinter.messagebox"),
  MovedModule("tkinter_tksimpledialog", "tkSimpleDialog", "tkinter.simpledialog"),
  MovedModule("urllib_parse", __name__ + ".moves.urllib_parse", "urllib.parse"),
  MovedModule("urllib_error", __name__ + ".moves.urllib_error", "urllib.error"),
  MovedModule("urllib", __name__ + ".moves.urllib", __name__ + ".moves.urllib"),
  MovedModule("urllib_robotparser", "robotparser", "urllib.robotparser"),
  MovedModule("xmlrpc_client", "xmlrpclib", "xmlrpc.client"),
  MovedModule("xmlrpc_server", "xmlrpclib", "xmlrpc.server"),
  MovedModule("winreg", "_winreg"),
]
for attr in _moved_attributes:
    setattr(_MovedItems, attr.name, attr)
    if isinstance(attr, MovedModule):
        sys.modules[__name__ + ".moves." + attr.name] = attr
del attr

_MovedItems._moved_attributes = _moved_attributes

moves = sys.modules[__name__ + ".moves"] = _MovedItems(__name__ + ".moves")


class Module_six_moves_urllib_parse(_LazyModule):
    """Lazy loading of moved objects in six.moves.urllib_parse"""


_urllib_parse_moved_attributes = [
  MovedAttribute("ParseResult", "urlparse", "urllib.parse"),
  MovedAttribute("SplitResult", "urlparse", "urllib.parse"),
  MovedAttribute("parse_qs", "urlparse", "urllib.parse"),
  MovedAttribute("parse_qsl", "urlparse", "urllib.parse"),
  MovedAttribute("urldefrag", "urlparse", "urllib.parse"),
  MovedAttribute("urljoin", "urlparse", "urllib.parse"),
  MovedAttribute("urlparse", "urlparse", "urllib.parse"),
  MovedAttribute("urlsplit", "urlparse", "urllib.parse"),
  MovedAttribute("urlunparse", "urlparse", "urllib.parse"),
  MovedAttribute("urlunsplit", "urlparse", "urllib.parse"),
  MovedAttribute("quote", "urllib", "urllib.parse"),
  MovedAttribute("quote_plus", "urllib", "urllib.parse"),
  MovedAttribute("unquote", "urllib", "urllib.parse"),
  MovedAttribute("unquote_plus", "urllib", "urllib.parse"),
  MovedAttribute("urlencode", "urllib", "urllib.parse"),
  MovedAttribute("splitquery", "urllib", "urllib.parse"),
]
for attr in _urllib_parse_moved_attributes:
    setattr(Module_six_moves_urllib_parse, attr.name, attr)
del attr

Module_six_moves_urllib_parse._moved_attributes = _urllib_parse_moved_attributes

sys.modules[__name__ + ".moves.urllib_parse"] = sys.modules[
  __name__ + ".moves.urllib.parse"] = Module_six_moves_urllib_parse(__name__
                                                                    + ".moves.urllib_parse")


class Module_six_moves_urllib_error(_LazyModule):
    """Lazy loading of moved objects in six.moves.urllib_error"""


_urllib_error_moved_attributes = [
  MovedAttribute("URLError", "urllib2", "urllib.error"),
  MovedAttribute("HTTPError", "urllib2", "urllib.error"),
  MovedAttribute("ContentTooShortError", "urllib", "urllib.error"),
]
for attr in _urllib_error_moved_attributes:
    setattr(Module_six_moves_urllib_error, attr.name, attr)
del attr

Module_six_moves_urllib_error._moved_attributes = _urllib_error_moved_attributes

sys.modules[__name__ + ".moves.urllib_error"] = sys.modules[
  __name__ + ".moves.urllib.error"] = Module_six_moves_urllib_error(__name__
                                                                    + ".moves.urllib.error")


class Module_six_moves_urllib_request(_LazyModule):
    """Lazy loading of moved objects in six.moves.urllib_request"""


_urllib_request_moved_attributes = [
  MovedAttribute("urlopen", "urllib2", "urllib.request"),
  MovedAttribute("install_opener", "urllib2", "urllib.request"),
  MovedAttribute("build_opener", "urllib2", "urllib.request"),
  MovedAttribute("pathname2url", "urllib", "urllib.request"),
  MovedAttribute("url2pathname", "urllib", "urllib.request"),
  MovedAttribute("getproxies", "urllib", "urllib.request"),
  MovedAttribute("Request", "urllib2", "urllib.request"),
  MovedAttribute("OpenerDirector", "urllib2", "urllib.request"),
  MovedAttribute("HTTPDefaultErrorHandler", "urllib2", "urllib.request"),
  MovedAttribute("HTTPRedirectHandler", "urllib2", "urllib.request"),
  MovedAttribute("HTTPCookieProcessor", "urllib2", "urllib.request"),
  MovedAttribute("ProxyHandler", "urllib2", "urllib.request"),
  MovedAttribute("BaseHandler", "urllib2", "urllib.request"),
  MovedAttribute("HTTPPasswordMgr", "urllib2", "urllib.request"),
  MovedAttribute("HTTPPasswordMgrWithDefaultRealm", "urllib2", "urllib.request"),
  MovedAttribute("AbstractBasicAuthHandler", "urllib2", "urllib.request"),
  MovedAttribute("HTTPBasicAuthHandler", "urllib2", "urllib.request"),
  MovedAttribute("ProxyBasicAuthHandler", "urllib2", "urllib.request"),
  MovedAttribute("AbstractDigestAuthHandler", "urllib2", "urllib.request"),
  MovedAttribute("HTTPDigestAuthHandler", "urllib2", "urllib.request"),
  MovedAttribute("ProxyDigestAuthHandler", "urllib2", "urllib.request"),
  MovedAttribute("HTTPHandler", "urllib2", "urllib.request"),
  MovedAttribute("HTTPSHandler", "urllib2", "urllib.request"),
  MovedAttribute("FileHandler", "urllib2", "urllib.request"),
  MovedAttribute("FTPHandler", "urllib2", "urllib.request"),
  MovedAttribute("CacheFTPHandler", "urllib2", "urllib.request"),
  MovedAttribute("UnknownHandler", "urllib2", "urllib.request"),
  MovedAttribute("HTTPErrorProcessor", "urllib2", "urllib.request"),
  MovedAttribute("urlretrieve", "urllib", "urllib.request"),
  MovedAttribute("urlcleanup", "urllib", "urllib.request"),
  MovedAttribute("URLopener", "urllib", "urllib.request"),
  MovedAttribute("FancyURLopener", "urllib", "urllib.request"),
  MovedAttribute("proxy_bypass", "urllib", "urllib.request"),
]
for attr in _urllib_request_moved_attributes:
    setattr(Module_six_moves_urllib_request, attr.name, attr)
del attr

Module_six_moves_urllib_request._moved_attributes = _urllib_request_moved_attributes

sys.modules[__name__ + ".moves.urllib_request"] = sys.modules[
  __name__ + ".moves.urllib.request"] = Module_six_moves_urllib_request(__name__
                                                                        + ".moves.urllib.request")


class Module_six_moves_urllib_response(_LazyModule):
    """Lazy loading of moved objects in six.moves.urllib_response"""


_urllib_response_moved_attributes = [
  MovedAttribute("addbase", "urllib", "urllib.response"),
  MovedAttribute("addclosehook", "urllib", "urllib.response"),
  MovedAttribute("addinfo", "urllib", "urllib.response"),
  MovedAttribute("addinfourl", "urllib", "urllib.response"),
]
for attr in _urllib_response_moved_attributes:
    setattr(Module_six_moves_urllib_response, attr.name, attr)
del attr

Module_six_moves_urllib_response._moved_attributes = _urllib_response_moved_attributes

sys.modules[__name__ + ".moves.urllib_response"] = sys.modules[
  __name__ + ".moves.urllib.response"] = Module_six_moves_urllib_response(__name__
                                                                          + ".moves.urllib.response")


class Module_six_moves_urllib_robotparser(_LazyModule):
    """Lazy loading of moved objects in six.moves.urllib_robotparser"""


_urllib_robotparser_moved_attributes = [
  MovedAttribute("RobotFileParser", "robotparser", "urllib.robotparser"),
]
for attr in _urllib_robotparser_moved_attributes:
    setattr(Module_six_moves_urllib_robotparser, attr.name, attr)
del attr

Module_six_moves_urllib_robotparser._moved_attributes = _urllib_robotparser_moved_attributes

sys.modules[__name__ + ".moves.urllib_robotparser"] = sys.modules[
  __name__ + ".moves.urllib.robotparser"] = Module_six_moves_urllib_robotparser(
    __name__ + ".moves.urllib.robotparser")


class Module_six_moves_urllib(types.ModuleType):
    """Create a six.moves.urllib namespace that resembles the Python 3 namespace"""
    parse = sys.modules[__name__ + ".moves.urllib_parse"]
    error = sys.modules[__name__ + ".moves.urllib_error"]
    request = sys.modules[__name__ + ".moves.urllib_request"]
    response = sys.modules[__name__ + ".moves.urllib_response"]
    robotparser = sys.modules[__name__ + ".moves.urllib_robotparser"]

    def __dir__(self):
        return ['parse', 'error', 'request', 'response', 'robotparser']


sys.modules[__name__ + ".moves.urllib"] = Module_six_moves_urllib(__name__ + ".moves.urllib")


def add_move(move):
    """Add an item to six.moves."""
    setattr(_MovedItems, move.name, move)


def remove_move(name):
    """Remove item from six.moves."""
    try:
        delattr(_MovedItems, name)
    except AttributeError:
        try:
            del moves.__dict__[name]
        except KeyError:
            raise AttributeError("no such move, %r" % (name, ))


if PY3:
    _meth_func = "__func__"
    _meth_self = "__self__"

    _func_closure = "__closure__"
    _func_code = "__code__"
    _func_defaults = "__defaults__"
    _func_globals = "__globals__"
else:
    _meth_func = "im_func"
    _meth_self = "im_self"

    _func_closure = "func_closure"
    _func_code = "func_code"
    _func_defaults = "func_defaults"
    _func_globals = "func_globals"

try:
    advance_iterator = next
except NameError:

    def advance_iterator(it):
        return it.next()


next = advance_iterator

try:
    callable = callable
except NameError:

    def callable(obj):
        return any("__call__" in klass.__dict__ for klass in type(obj).__mro__)


if PY3:

    def get_unbound_function(unbound):
        return unbound

    create_bound_method = types.MethodType

    Iterator = object
else:

    def get_unbound_function(unbound):
        return unbound.im_func

    def create_bound_method(func, obj):
        return types.MethodType(func, obj, obj.__class__)

    class Iterator(object):

        def next(self):
            return type(self).__next__(self)

    callable = callable
_add_doc(get_unbound_function, """Get the function out of a possibly unbound function""")

get_method_function = operator.attrgetter(_meth_func)
get_method_self = operator.attrgetter(_meth_self)
get_function_closure = operator.attrgetter(_func_closure)
get_function_code = operator.attrgetter(_func_code)
get_function_defaults = operator.attrgetter(_func_defaults)
get_function_globals = operator.attrgetter(_func_globals)

if PY3:

    def iterkeys(d, **kw):
        return iter(d.keys(**kw))

    def itervalues(d, **kw):
        return iter(d.values(**kw))

    def iteritems(d, **kw):
        return iter(d.items(**kw))

    def iterlists(d, **kw):
        return iter(d.lists(**kw))
else:

    def iterkeys(d, **kw):
        return iter(d.iterkeys(**kw))

    def itervalues(d, **kw):
        return iter(d.itervalues(**kw))

    def iteritems(d, **kw):
        return iter(d.iteritems(**kw))

    def iterlists(d, **kw):
        return iter(d.iterlists(**kw))


_add_doc(iterkeys, "Return an iterator over the keys of a dictionary.")
_add_doc(itervalues, "Return an iterator over the values of a dictionary.")
_add_doc(iteritems, "Return an iterator over the (key, value) pairs of a dictionary.")
_add_doc(iterlists, "Return an iterator over the (key, [values]) pairs of a dictionary.")

if PY3:

    def b(s):
        return s.encode("latin-1")

    def u(s):
        return s

    unichr = chr
    if sys.version_info[1] <= 1:

        def int2byte(i):
            return bytes((i, ))
    else:
        # This is about 2x faster than the implementation above on 3.2+
        int2byte = operator.methodcaller("to_bytes", 1, "big")
    byte2int = operator.itemgetter(0)
    indexbytes = operator.getitem
    iterbytes = iter
    import io
    StringIO = io.StringIO
    BytesIO = io.BytesIO
else:

    def b(s):
        return s
    # Workaround for standalone backslash

    def u(s):
        return unicode(s.replace(r'\\', r'\\\\'), "unicode_escape")

    unichr = unichr
    int2byte = chr

    def byte2int(bs):
        return ord(bs[0])

    def indexbytes(buf, i):
        return ord(buf[i])

    def iterbytes(buf):
        return (ord(byte) for byte in buf)

    import StringIO
    StringIO = BytesIO = StringIO.StringIO
_add_doc(b, """Byte literal""")
_add_doc(u, """Text literal""")

if PY3:
    exec_ = getattr(moves.builtins, "exec")

    def reraise(tp, value, tb=None):
        if value.__traceback__ is not tb:
            raise value.with_traceback(tb)
        raise value

else:

    def exec_(_code_, _globs_=None, _locs_=None):
        """Execute code in a namespace."""
        if _globs_ is None:
            frame = sys._getframe(1)
            _globs_ = frame.f_globals
            if _locs_ is None:
                _locs_ = frame.f_locals
            del frame
        elif _locs_ is None:
            _locs_ = _globs_
        exec("""exec _code_ in _globs_, _locs_""")

    exec_("""def reraise(tp, value, tb=None):
    raise tp, value, tb
""")

print_ = getattr(moves.builtins, "print", None)
if print_ is None:

    def print_(*args, **kwargs):
        """The new-style print function for Python 2.4 and 2.5."""
        fp = kwargs.pop("file", sys.stdout)
        if fp is None:
            return

        def write(data):
            if not isinstance(data, basestring):
                data = str(data)
            # If the file has an encoding, encode unicode with it.
            if (isinstance(fp, file) and isinstance(data, unicode) and fp.encoding is not None):
                errors = getattr(fp, "errors", None)
                if errors is None:
                    errors = "strict"
                data = data.encode(fp.encoding, errors)
            fp.write(data)

        want_unicode = False
        sep = kwargs.pop("sep", None)
        if sep is not None:
            if isinstance(sep, unicode):
                want_unicode = True
            elif not isinstance(sep, str):
                raise TypeError("sep must be None or a string")
        end = kwargs.pop("end", None)
        if end is not None:
            if isinstance(end, unicode):
                want_unicode = True
            elif not isinstance(end, str):
                raise TypeError("end must be None or a string")
        if kwargs:
            raise TypeError("invalid keyword arguments to print()")
        if not want_unicode:
            for arg in args:
                if isinstance(arg, unicode):
                    want_unicode = True
                    break
        if want_unicode:
            newline = unicode("\n")
            space = unicode(" ")
        else:
            newline = "\n"
            space = " "
        if sep is None:
            sep = space
        if end is None:
            end = newline
        for i, arg in enumerate(args):
            if i:
                write(sep)
            write(arg)
        write(end)


_add_doc(reraise, """Reraise an exception.""")


def with_metaclass(meta, *bases):
    """Create a base class with a metaclass."""
    return meta("NewBase", bases, {})


def add_metaclass(metaclass):
    """Class decorator for creating a class with a metaclass."""

    def wrapper(cls):
        orig_vars = cls.__dict__.copy()
        orig_vars.pop('__dict__', None)
        orig_vars.pop('__weakref__', None)
        slots = orig_vars.get('__slots__')
        if slots is not None:
            if isinstance(slots, str):
                slots = [slots]
            for slots_var in slots:
                orig_vars.pop(slots_var)
        return metaclass(cls.__name__, cls.__bases__, orig_vars)

    return wrapper


# added as part of the RDKit port
if PY3:

    def cmp(t1, t2):
        return (t1 < t2) * -1 or (t1 > t2) * 1
else:
    cmp = cmp