# 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 os

import sys

ispy3 = (sys.version_info[0] >= 3)

if not ispy3:

    import cPickle as pickle

    import cStringIO as io

    import httplib

    import Queue as _queue

    import SocketServer as socketserver

    import urlparse

    urlunquote = urlparse.unquote

    import xmlrpclib

else:

    import http.client as httplib

    import io

    import pickle

    import queue as _queue

    import socketserver

    import urllib.parse as urlparse

    urlunquote = urlparse.unquote_to_bytes

    import xmlrpc.client as xmlrpclib

if ispy3:

    import builtins

    import functools

    fsencode = os.fsencode

    fsdecode = os.fsdecode

    # A bytes version of os.name.

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

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

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

    # os.getcwd() on Python 3 returns string, but it has os.getcwdb() which

    # returns bytes.

    getcwd = os.getcwdb

    # 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

    #

    # TODO: On Windows, the native argv is wchar_t, so we'll need a different

    # workaround to simulate the Python 2 (i.e. ANSI Win32 API) behavior.

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

    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(u'latin-1')

    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

    # getopt.getopt() on Python 3 deals with unicodes internally so we cannot

    # pass bytes there. Passing unicodes will result in unicodes as return

    # values which we need to convert again to bytes.

    def getoptb(args, shortlist, namelist):

        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 = getopt.getopt(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

else:

    def sysstr(s):

        return s

    # Partial backport from os.py in Python 3, which only accepts bytes.

    # In Python 2, our paths should only ever be bytes, a unicode path

    # indicates a bug.

    def fsencode(filename):

        if isinstance(filename, str):

            return filename

        else:

            raise TypeError(

                "expect str, not %s" % type(filename).__name__)

    # In Python 2, fsdecode() has a very chance to receive bytes. So it's

    # better not to touch Python 2 part as it's already working fine.

    def fsdecode(filename):

        return filename

    def getoptb(args, shortlist, namelist):

        return getopt.getopt(args, shortlist, namelist)

    osname = os.name

    ospathsep = os.pathsep

    ossep = os.sep

    stdin = sys.stdin

    stdout = sys.stdout

    stderr = sys.stderr

    sysargv = sys.argv

    getcwd = os.getcwd

stringio = io.StringIO

empty = _queue.Empty

queue = _queue.Queue

class _pycompatstub(object):

    def __init__(self):

        self._aliases = {}

    def _registeraliases(self, origin, items):

        """Add items that will be populated at the first access"""

        items = map(sysstr, items)

        self._aliases.update(

            (item.replace(sysstr('_'), sysstr('')).lower(), (origin, item))

            for item in items)

    def __getattr__(self, name):

        try:

            origin, item = self._aliases[name]

        except KeyError:

            raise AttributeError(name)

        self.__dict__[name] = obj = getattr(origin, item)

        return obj

httpserver = _pycompatstub()

urlreq = _pycompatstub()

urlerr = _pycompatstub()

if not ispy3:

    import BaseHTTPServer

    import CGIHTTPServer

    import SimpleHTTPServer

    import urllib2

    import urllib

    urlreq._registeraliases(urllib, (

        "addclosehook",

        "addinfourl",

        "ftpwrapper",

        "pathname2url",

        "quote",

        "splitattr",

        "splitpasswd",

        "splitport",

        "splituser",

        "unquote",

        "url2pathname",

        "urlencode",

    ))

    urlreq._registeraliases(urllib2, (

        "AbstractHTTPHandler",

        "BaseHandler",

        "build_opener",

        "FileHandler",

        "FTPHandler",

        "HTTPBasicAuthHandler",

        "HTTPDigestAuthHandler",

        "HTTPHandler",

        "HTTPPasswordMgrWithDefaultRealm",

        "HTTPSHandler",

        "install_opener",

        "ProxyHandler",

        "Request",

        "urlopen",

    ))

    urlerr._registeraliases(urllib2, (

        "HTTPError",

        "URLError",

    ))

    httpserver._registeraliases(BaseHTTPServer, (

        "HTTPServer",

        "BaseHTTPRequestHandler",

    ))

    httpserver._registeraliases(SimpleHTTPServer, (

        "SimpleHTTPRequestHandler",

    ))

    httpserver._registeraliases(CGIHTTPServer, (

        "CGIHTTPRequestHandler",

    ))

else:

    import urllib.request

    urlreq._registeraliases(urllib.request, (

        "AbstractHTTPHandler",

        "addclosehook",

        "addinfourl",

        "BaseHandler",

        "build_opener",

        "FileHandler",

        "FTPHandler",

        "ftpwrapper",

        "HTTPHandler",

        "HTTPSHandler",

        "install_opener",

        "pathname2url",

        "HTTPBasicAuthHandler",

        "HTTPDigestAuthHandler",

        "HTTPPasswordMgrWithDefaultRealm",

        "ProxyHandler",

        "quote",

        "Request",

        "splitattr",

        "splitpasswd",

        "splitport",

        "splituser",

        "unquote",

        "url2pathname",

        "urlopen",

    ))

    import urllib.error

    urlerr._registeraliases(urllib.error, (

        "HTTPError",

        "URLError",

    ))

    import http.server

    httpserver._registeraliases(http.server, (

        "HTTPServer",

        "BaseHTTPRequestHandler",

        "SimpleHTTPRequestHandler",

        "CGIHTTPRequestHandler",

    ))