# 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.

"""

from __future__ import absolute_import

import getopt

import inspect

import json

import os

import shlex

import sys

import tempfile

ispy3 = sys.version_info[0] >= 3

ispypy = r'__pypy__' in sys.builtin_module_names

if not ispy3:

    import cookielib

    import cPickle as pickle

    import httplib

    import Queue as queue

    import SocketServer as socketserver

    import xmlrpclib

    from .thirdparty.concurrent import futures

    def future_set_exception_info(f, exc_info):

        f.set_exception_info(*exc_info)

else:

    import concurrent.futures as futures

    import http.cookiejar as cookielib

    import http.client as httplib

    import pickle

    import queue as queue

    import socketserver

    import xmlrpc.client as xmlrpclib

    def future_set_exception_info(f, exc_info):

        f.set_exception(exc_info[0])

def identity(a):

    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 ispy3:

    import builtins

    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()

    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')

    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

    # TODO: .buffer might not exist if std streams were replaced; we'll need

    # a silly wrapper to make a bytes stream backed by a unicode one.

    stdin = sys.stdin.buffer

    stdout = sys.stdout.buffer

    stderr = sys.stderr.buffer

    # Since Python 3 converts argv to wchar_t type by Py_DecodeLocale() on Unix,

    # we can use os.fsencode() to get back bytes argv.

    #

    # https://hg.python.org/cpython/file/v3.5.1/Programs/python.c#l55

    #

    # On Windows, the native argv is unicode and is converted to MBCS bytes

    # since we do enable the legacy filesystem encoding.

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

        sysargv = list(map(os.fsencode, sys.argv))

    bytechr = struct.Struct(r'>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

        """

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

            if isinstance(s, bytestr):

                return s

            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)

            return 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)).

        """

        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 dictonaries with bytes keys

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

        """

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

        return dic

    def byteskwargs(dic):

        """

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

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

        """

        dic = dict((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'

            elif len(b) == 2:

                if not b[0]:

                    # 00 XX - utf-16-be

                    return 'utf-16-be'

                if not b[1]:

                    # XX 00 - utf-16-le

                    return 'utf-16-le'

            # default

            return 'utf-8'

        def json_loads(s, *args, **kwargs):

            if isinstance(s, (bytes, bytearray)):

                s = s.decode(_detect_encoding(s), 'surrogatepass')

            return json.loads(s, *args, **kwargs)

    else:

        json_loads = json.loads

else:

    import cStringIO

    xrange = xrange

    unicode = unicode