# pycompat.py - portability shim for python 3

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

"""Mercurial portability shim for python 3.

This contains aliases to hide python version-specific details from the core.

"""

import builtins

import codecs

import concurrent.futures as futures

import functools

import getopt

import http.client as httplib

import http.cookiejar as cookielib

import inspect

import io

import json

import os

import queue

import shlex

import socketserver

import struct

import sys

import tempfile

import xmlrpc.client as xmlrpclib

from typing import (

    Any,

    AnyStr,

    BinaryIO,

    Callable,

    Dict,

    Iterable,

    Iterator,

    List,

    Mapping,

    NoReturn,

    Optional,

    Sequence,

    Tuple,

    Type,

    TypeVar,

    cast,

    overload,

)

ispy3 = sys.version_info[0] >= 3

ispypy = '__pypy__' in sys.builtin_module_names

TYPE_CHECKING = False

if not globals():  # hide this from non-pytype users

    import typing

    TYPE_CHECKING = typing.TYPE_CHECKING

_GetOptResult = Tuple[List[Tuple[bytes, bytes]], List[bytes]]

_T0 = TypeVar('_T0')

_T1 = TypeVar('_T1')

_S = TypeVar('_S')

_Tbytestr = TypeVar('_Tbytestr', bound='bytestr')

def future_set_exception_info(f, exc_info):

    f.set_exception(exc_info[0])

FileNotFoundError = builtins.FileNotFoundError

def identity(a: _T0) -> _T0:

    return a

def _rapply(f, xs):

    if xs is None:

        # assume None means non-value of optional data

        return xs

    if isinstance(xs, (list, set, tuple)):

        return type(xs)(_rapply(f, x) for x in xs)

    if isinstance(xs, dict):

        return type(xs)((_rapply(f, k), _rapply(f, v)) for k, v in xs.items())

    return f(xs)

def rapply(f, xs):

    """Apply function recursively to every item preserving the data structure

    >>> def f(x):

    ...     return 'f(%s)' % x

    >>> rapply(f, None) is None

    True

    >>> rapply(f, 'a')

    'f(a)'

    >>> rapply(f, {'a'}) == {'f(a)'}

    True

    >>> rapply(f, ['a', 'b', None, {'c': 'd'}, []])

    ['f(a)', 'f(b)', None, {'f(c)': 'f(d)'}, []]

    >>> xs = [object()]

    >>> rapply(identity, xs) is xs

    True

    """

    if f is identity:

        # fast path mainly for py2

        return xs

    return _rapply(f, xs)

if os.name == r'nt':

    # 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: bytes = os.curdir.encode('ascii')

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

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

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

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

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

osaltsep: Optional[bytes] = os.altsep.encode('ascii') if os.altsep else None

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

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

sysexecutable: bytes = os.fsencode(sys.executable) if sys.executable else b''

if TYPE_CHECKING:

    @overload

    def maplist(f: Callable[[_T0], _S], arg: Iterable[_T0]) -> List[_S]:

        ...

    @overload

    def maplist(

        f: Callable[[_T0, _T1], _S], arg1: Iterable[_T0], arg2: Iterable[_T1]

    ) -> List[_S]:

        ...

def maplist(f, *args):

    return list(map(f, *args))

def rangelist(*args) -> List[int]:

    return list(range(*args))

def ziplist(*args):

    return list(zip(*args))

rawinput = input

getargspec = inspect.getfullargspec

long = int

if builtins.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.

    sysargv: List[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:

    ...     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: object = b'') -> None:

            pass

    def __new__(cls: Type[_Tbytestr], s: object = b'') -> _Tbytestr:

        if isinstance(s, bytestr):

            return s

        if not isinstance(

            s, (bytes, bytearray)

        ) and not builtins.hasattr(  # hasattr-py3-only

            s, u'__bytes__'

        ):

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

        return bytes.__new__(cls, s)

    # The base class uses `int` return in py3, but the point of this class is to

    # behave like py2.

    def __getitem__(self, key) -> bytes:  # pytype: disable=signature-mismatch

        s = bytes.__getitem__(self, key)

        if not isinstance(s, bytes):

            s = bytechr(s)

        return s

    # The base class expects `Iterator[int]` return in py3, but the point of

    # this class is to behave like py2.

    def __iter__(self) -> Iterator[bytes]:  # pytype: disable=signature-mismatch

        return iterbytestr(bytes.__iter__(self))

    def __repr__(self) -> str:

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

def iterbytestr(s: Iterable[int]) -> Iterator[bytes]:

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

    return map(bytechr, s)

if TYPE_CHECKING:

    @overload

    def maybebytestr(s: bytes) -> bytestr:

        ...

    @overload

    def maybebytestr(s: _T0) -> _T0:

        ...

def maybebytestr(s):

    """Promote bytes to bytestr"""

    if isinstance(s, bytes):

        return bytestr(s)

    return s

def sysbytes(s: AnyStr) -> bytes:

    """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: AnyStr) -> str:

    """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: AnyStr) -> str:

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

    if isinstance(url, bytes):

        return url.decode('ascii')

    return url

def bytesurl(url: AnyStr) -> bytes:

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

    if isinstance(url, str):

        return url.encode('ascii')

    return url

def raisewithtb(exc: BaseException, tb) -> NoReturn:

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

    raise exc.with_traceback(tb)

def getdoc(obj: object) -> Optional[bytes]:

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

    with _('')"""

    doc = builtins.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: AnyStr = b'r',

    buffering: int = -1,

    encoding: Optional[str] = None,

) -> Any:

    # TODO: assert binary mode, and cast result to BinaryIO?

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

safehasattr = _wrapattrfunc(builtins.hasattr)

def _getoptbwrapper(

    orig, args: Sequence[bytes], shortlist: bytes, namelist: Sequence[bytes]

) -> _GetOptResult:

    """

    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]