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//usr/lib/python2.7/site-packages/werkzeug/_compat.py

# flake8: noqa
# This whole file is full of lint errors
import functools
import operator
import sys

try:
    import builtins
except ImportError:
    import __builtin__ as builtins

PY2 = sys.version_info[0] == 2
WIN = sys.platform.startswith("win")

_identity = lambda x: x

if PY2:
    unichr = unichr
    text_type = unicode
    string_types = (str, unicode)
    integer_types = (int, long)

iterkeys = lambda d, *args, **kwargs: d.iterkeys(*args, **kwargs)
    itervalues = lambda d, *args, **kwargs: d.itervalues(*args, **kwargs)
    iteritems = lambda d, *args, **kwargs: d.iteritems(*args, **kwargs)

iterlists = lambda d, *args, **kwargs: d.iterlists(*args, **kwargs)
    iterlistvalues = lambda d, *args, **kwargs: d.iterlistvalues(*args, **kwargs)

int_to_byte = chr
    iter_bytes = iter

import collections as collections_abc

exec("def reraise(tp, value, tb=None):\n raise tp, value, tb")

def fix_tuple_repr(obj):
        def __repr__(self):
            cls = self.__class__
            return "%s(%s)" % (
                cls.__name__,
                ", ".join(
                    "%s=%r" % (field, self[index])
                    for index, field in enumerate(cls._fields)
                ),
            )

obj.__repr__ = __repr__
        return obj

def implements_iterator(cls):
        cls.next = cls.__next__
        del cls.__next__
        return cls

def implements_to_string(cls):
        cls.__unicode__ = cls.__str__
        cls.__str__ = lambda x: x.__unicode__().encode("utf-8")
        return cls

def native_string_result(func):
        def wrapper(*args, **kwargs):
            return func(*args, **kwargs).encode("utf-8")

return functools.update_wrapper(wrapper, func)

def implements_bool(cls):
        cls.__nonzero__ = cls.__bool__
        del cls.__bool__
        return cls

from itertools import imap, izip, ifilter

range_type = xrange

from StringIO import StringIO
    from cStringIO import StringIO as BytesIO

NativeStringIO = BytesIO

def make_literal_wrapper(reference):
        return _identity

def normalize_string_tuple(tup):
        """Normalizes a string tuple to a common type. Following Python 2
        rules, upgrades to unicode are implicit.
        """
        if any(isinstance(x, text_type) for x in tup):
            return tuple(to_unicode(x) for x in tup)
        return tup

def try_coerce_native(s):
        """Try to coerce a unicode string to native if possible. Otherwise,
        leave it as unicode.
        """
        try:
            return to_native(s)
        except UnicodeError:
            return s

wsgi_get_bytes = _identity

def wsgi_decoding_dance(s, charset="utf-8", errors="replace"):
        return s.decode(charset, errors)

def wsgi_encoding_dance(s, charset="utf-8", errors="replace"):
        if isinstance(s, bytes):
            return s
        return s.encode(charset, errors)

def to_bytes(x, charset=sys.getdefaultencoding(), errors="strict"):
        if x is None:
            return None
        if isinstance(x, (bytes, bytearray, buffer)):
            return bytes(x)
        if isinstance(x, unicode):
            return x.encode(charset, errors)
        raise TypeError("Expected bytes")

def to_native(x, charset=sys.getdefaultencoding(), errors="strict"):
        if x is None or isinstance(x, str):
            return x
        return x.encode(charset, errors)

else:
    unichr = chr
    text_type = str
    string_types = (str,)
    integer_types = (int,)

iterkeys = lambda d, *args, **kwargs: iter(d.keys(*args, **kwargs))
    itervalues = lambda d, *args, **kwargs: iter(d.values(*args, **kwargs))
    iteritems = lambda d, *args, **kwargs: iter(d.items(*args, **kwargs))

iterlists = lambda d, *args, **kwargs: iter(d.lists(*args, **kwargs))
    iterlistvalues = lambda d, *args, **kwargs: iter(d.listvalues(*args, **kwargs))

int_to_byte = operator.methodcaller("to_bytes", 1, "big")
    iter_bytes = functools.partial(map, int_to_byte)

import collections.abc as collections_abc

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

fix_tuple_repr = _identity
    implements_iterator = _identity
    implements_to_string = _identity
    implements_bool = _identity
    native_string_result = _identity
    imap = map
    izip = zip
    ifilter = filter
    range_type = range

from io import StringIO, BytesIO

NativeStringIO = StringIO

_latin1_encode = operator.methodcaller("encode", "latin1")

def make_literal_wrapper(reference):
        if isinstance(reference, text_type):
            return _identity
        return _latin1_encode

def normalize_string_tuple(tup):
        """Ensures that all types in the tuple are either strings
        or bytes.
        """
        tupiter = iter(tup)
        is_text = isinstance(next(tupiter, None), text_type)
        for arg in tupiter:
            if isinstance(arg, text_type) != is_text:
                raise TypeError(
                    "Cannot mix str and bytes arguments (got %s)" % repr(tup)
                )
        return tup

try_coerce_native = _identity
    wsgi_get_bytes = _latin1_encode

def wsgi_decoding_dance(s, charset="utf-8", errors="replace"):
        return s.encode("latin1").decode(charset, errors)

def wsgi_encoding_dance(s, charset="utf-8", errors="replace"):
        if isinstance(s, text_type):
            s = s.encode(charset)
        return s.decode("latin1", errors)

def to_bytes(x, charset=sys.getdefaultencoding(), errors="strict"):
        if x is None:
            return None
        if isinstance(x, (bytes, bytearray, memoryview)):  # noqa
            return bytes(x)
        if isinstance(x, str):
            return x.encode(charset, errors)
        raise TypeError("Expected bytes")

def to_native(x, charset=sys.getdefaultencoding(), errors="strict"):
        if x is None or isinstance(x, str):
            return x
        return x.decode(charset, errors)

def to_unicode(
    x, charset=sys.getdefaultencoding(), errors="strict", allow_none_charset=False
):
    if x is None:
        return None
    if not isinstance(x, bytes):
        return text_type(x)
    if charset is None and allow_none_charset:
        return x
    return x.decode(charset, errors)