import codecs

import functools

import io

import struct

if os.name == r'nt' and sys.version_info >= (3, 6):

    # MBCS (or ANSI) filesystem encoding must be used as before.

    # Otherwise non-ASCII filenames in existing repositories would be

    # corrupted.

    # This must be set once prior to any fsencode/fsdecode calls.

    sys._enablelegacywindowsfsencoding()  # pytype: disable=module-attr

fsencode = os.fsencode

fsdecode = os.fsdecode

oscurdir = os.curdir.encode('ascii')

oslinesep = os.linesep.encode('ascii')

osname = os.name.encode('ascii')

ospathsep = os.pathsep.encode('ascii')

ospardir = os.pardir.encode('ascii')

ossep = os.sep.encode('ascii')

osaltsep = os.altsep

if osaltsep:

    osaltsep = osaltsep.encode('ascii')

osdevnull = os.devnull.encode('ascii')

sysplatform = sys.platform.encode('ascii')

sysexecutable = sys.executable

if sysexecutable:

    sysexecutable = os.fsencode(sysexecutable)

bytesio = io.BytesIO

# TODO deprecate stringio name, as it is a lie on Python 3.

stringio = bytesio

def maplist(*args):

    return list(map(*args))

def rangelist(*args):

    return list(range(*args))

def ziplist(*args):

    return list(zip(*args))

rawinput = input

getargspec = inspect.getfullargspec

long = int

if getattr(sys, 'argv', None) is not None:

    # On POSIX, the char** argv array is converted to Python str using

    # Py_DecodeLocale(). The inverse of this is Py_EncodeLocale(), which

    # isn't directly callable from Python code. In practice, os.fsencode()

    # can be used instead (this is recommended by Python's documentation

    # for sys.argv).

    #

    # On Windows, the wchar_t **argv is passed into the interpreter as-is.

    # Like POSIX, we need to emulate what Py_EncodeLocale() would do. But

    # there's an additional wrinkle. What we really want to access is the

    # ANSI codepage representation of the arguments, as this is what

    # `int main()` would receive if Python 3 didn't define `int wmain()`

    # (this is how Python 2 worked). To get that, we encode with the mbcs

    # encoding, which will pass CP_ACP to the underlying Windows API to

    # produce bytes.

    if os.name == r'nt':

        sysargv = [a.encode("mbcs", "ignore") for a in sys.argv]

    else:

        sysargv = [fsencode(a) for a in sys.argv]

bytechr = struct.Struct('>B').pack

byterepr = b'%r'.__mod__

class bytestr(bytes):

    """A bytes which mostly acts as a Python 2 str

    >>> bytestr(), bytestr(bytearray(b'foo')), bytestr(u'ascii'), bytestr(1)

    ('', 'foo', 'ascii', '1')

    >>> s = bytestr(b'foo')

    >>> assert s is bytestr(s)

    __bytes__() should be called if provided:

    >>> class bytesable(object):

    ...     def __bytes__(self):

    ...         return b'bytes'

    >>> bytestr(bytesable())

    'bytes'

    There's no implicit conversion from non-ascii str as its encoding is

    unknown:

    >>> bytestr(chr(0x80)) # doctest: +ELLIPSIS

    Traceback (most recent call last):

      ...

    UnicodeEncodeError: ...

    Comparison between bytestr and bytes should work:

    >>> assert bytestr(b'foo') == b'foo'

    >>> assert b'foo' == bytestr(b'foo')

    >>> assert b'f' in bytestr(b'foo')

    >>> assert bytestr(b'f') in b'foo'

    Sliced elements should be bytes, not integer:

    >>> s[1], s[:2]

    (b'o', b'fo')

    >>> list(s), list(reversed(s))

    ([b'f', b'o', b'o'], [b'o', b'o', b'f'])

    As bytestr type isn't propagated across operations, you need to cast

    bytes to bytestr explicitly:

    >>> s = bytestr(b'foo').upper()

    >>> t = bytestr(s)

    >>> s[0], t[0]

    (70, b'F')

    Be careful to not pass a bytestr object to a function which expects

    bytearray-like behavior.

    >>> t = bytes(t)  # cast to bytes

    >>> assert type(t) is bytes

    """

    # Trick pytype into not demanding Iterable[int] be passed to __new__(),

    # since the appropriate bytes format is done internally.

    #

    # https://github.com/google/pytype/issues/500

    if TYPE_CHECKING:

        def __init__(self, s=b''):

            pass

    def __new__(cls, s=b''):

        if isinstance(s, bytestr):

        if not isinstance(

            s, (bytes, bytearray)

        ) and not hasattr(  # hasattr-py3-only

            s, u'__bytes__'

        ):

            s = str(s).encode('ascii')

        return bytes.__new__(cls, s)

    def __getitem__(self, key):

        s = bytes.__getitem__(self, key)

        if not isinstance(s, bytes):

            s = bytechr(s)

    def __iter__(self):

        return iterbytestr(bytes.__iter__(self))

    def __repr__(self):

        return bytes.__repr__(self)[1:]  # drop b''

def iterbytestr(s):

    """Iterate bytes as if it were a str object of Python 2"""

    return map(bytechr, s)

def maybebytestr(s):

    """Promote bytes to bytestr"""

    if isinstance(s, bytes):

        return bytestr(s)

    return s

def sysbytes(s):

    """Convert an internal str (e.g. keyword, __doc__) back to bytes

    This never raises UnicodeEncodeError, but only ASCII characters

    can be round-trip by sysstr(sysbytes(s)).

    """

    if isinstance(s, bytes):

        return s

    return s.encode('utf-8')

def sysstr(s):

    """Return a keyword str to be passed to Python functions such as

    getattr() and str.encode()

    This never raises UnicodeDecodeError. Non-ascii characters are

    considered invalid and mapped to arbitrary but unique code points

    such that 'sysstr(a) != sysstr(b)' for all 'a != b'.

    """

    if isinstance(s, builtins.str):

        return s

    return s.decode('latin-1')

def strurl(url):

    """Converts a bytes url back to str"""

    if isinstance(url, bytes):

        return url.decode('ascii')

    return url

def bytesurl(url):

    """Converts a str url to bytes by encoding in ascii"""

    if isinstance(url, str):

        return url.encode('ascii')

    return url

def raisewithtb(exc, tb):

    """Raise exception with the given traceback"""

    raise exc.with_traceback(tb)

def getdoc(obj):

    """Get docstring as bytes; may be None so gettext() won't confuse it

    with _('')"""

    doc = getattr(obj, '__doc__', None)

    if doc is None:

        return doc

    return sysbytes(doc)

def _wrapattrfunc(f):

    @functools.wraps(f)

    def w(object, name, *args):

        return f(object, sysstr(name), *args)

    return w

# these wrappers are automagically imported by hgloader

delattr = _wrapattrfunc(builtins.delattr)

getattr = _wrapattrfunc(builtins.getattr)

hasattr = _wrapattrfunc(builtins.hasattr)

setattr = _wrapattrfunc(builtins.setattr)

xrange = builtins.range

unicode = str

def open(name, mode=b'r', buffering=-1, encoding=None):

    return builtins.open(name, sysstr(mode), buffering, encoding)

safehasattr = _wrapattrfunc(builtins.hasattr)

def _getoptbwrapper(orig, args, shortlist, namelist):

    """

    Takes bytes arguments, converts them to unicode, pass them to

    getopt.getopt(), convert the returned values back to bytes and then

    return them for Python 3 compatibility as getopt.getopt() don't accepts

    bytes on Python 3.

    """

    args = [a.decode('latin-1') for a in args]

    shortlist = shortlist.decode('latin-1')

    namelist = [a.decode('latin-1') for a in namelist]

    opts, args = orig(args, shortlist, namelist)

    opts = [(a[0].encode('latin-1'), a[1].encode('latin-1')) for a in opts]

    args = [a.encode('latin-1') for a in args]

    return opts, args

def strkwargs(dic):

    """

    Converts the keys of a python dictonary to str i.e. unicodes so that

    they can be passed as keyword arguments as dictionaries with bytes keys

    can't be passed as keyword arguments to functions on Python 3.

    """

    dic = {k.decode('latin-1'): v for k, v in dic.items()}

    return dic

def byteskwargs(dic):

    """

    Converts keys of python dictionaries to bytes as they were converted to

    str to pass that dictonary as a keyword argument on Python 3.

    """

    dic = {k.encode('latin-1'): v for k, v in dic.items()}

    return dic

# TODO: handle shlex.shlex().

def shlexsplit(s, comments=False, posix=True):

    """

    Takes bytes argument, convert it to str i.e. unicodes, pass that into

    shlex.split(), convert the returned value to bytes and return that for

    Python 3 compatibility as shelx.split() don't accept bytes on Python 3.

    """

    ret = shlex.split(s.decode('latin-1'), comments, posix)

    return [a.encode('latin-1') for a in ret]

iteritems = lambda x: x.items()

itervalues = lambda x: x.values()

# Python 3.5's json.load and json.loads require str. We polyfill its

# code for detecting encoding from bytes.

if sys.version_info[0:2] < (3, 6):

    def _detect_encoding(b):

        bstartswith = b.startswith

        if bstartswith((codecs.BOM_UTF32_BE, codecs.BOM_UTF32_LE)):

            return 'utf-32'

        if bstartswith((codecs.BOM_UTF16_BE, codecs.BOM_UTF16_LE)):

            return 'utf-16'

        if bstartswith(codecs.BOM_UTF8):

            return 'utf-8-sig'

        if len(b) >= 4:

            if not b[0]:

                # 00 00 -- -- - utf-32-be

                # 00 XX -- -- - utf-16-be

                return 'utf-16-be' if b[1] else 'utf-32-be'

            if not b[1]:

                # XX 00 00 00 - utf-32-le

                # XX 00 00 XX - utf-16-le

                # XX 00 XX -- - utf-16-le

                return 'utf-16-le' if b[2] or b[3] else 'utf-32-le'