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# pycompat.py - portability shim for python 3
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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"""Mercurial portability shim for python 3.
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This contains aliases to hide python version-specific details from the core.
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"""
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import builtins
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import codecs
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import concurrent.futures as futures
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import functools
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import getopt
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import http.client as httplib
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import http.cookiejar as cookielib
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import inspect
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import io
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import json
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import os
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import queue
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import shlex
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import socketserver
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import struct
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import sys
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import tempfile
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import xmlrpc.client as xmlrpclib
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ispy3 = sys.version_info[0] >= 3
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ispypy = '__pypy__' in sys.builtin_module_names
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TYPE_CHECKING = False
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if not globals(): # hide this from non-pytype users
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import typing
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TYPE_CHECKING = typing.TYPE_CHECKING
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def future_set_exception_info(f, exc_info):
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f.set_exception(exc_info[0])
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FileNotFoundError = builtins.FileNotFoundError
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def identity(a):
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return a
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def _rapply(f, xs):
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if xs is None:
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# assume None means non-value of optional data
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return xs
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if isinstance(xs, (list, set, tuple)):
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return type(xs)(_rapply(f, x) for x in xs)
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if isinstance(xs, dict):
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return type(xs)((_rapply(f, k), _rapply(f, v)) for k, v in xs.items())
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return f(xs)
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def rapply(f, xs):
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"""Apply function recursively to every item preserving the data structure
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>>> def f(x):
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... return 'f(%s)' % x
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>>> rapply(f, None) is None
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True
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>>> rapply(f, 'a')
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'f(a)'
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>>> rapply(f, {'a'}) == {'f(a)'}
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True
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>>> rapply(f, ['a', 'b', None, {'c': 'd'}, []])
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['f(a)', 'f(b)', None, {'f(c)': 'f(d)'}, []]
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>>> xs = [object()]
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>>> rapply(identity, xs) is xs
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True
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"""
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if f is identity:
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# fast path mainly for py2
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return xs
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return _rapply(f, xs)
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if os.name == r'nt':
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# MBCS (or ANSI) filesystem encoding must be used as before.
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# Otherwise non-ASCII filenames in existing repositories would be
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# corrupted.
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# This must be set once prior to any fsencode/fsdecode calls.
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sys._enablelegacywindowsfsencoding() # pytype: disable=module-attr
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fsencode = os.fsencode
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fsdecode = os.fsdecode
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oscurdir = os.curdir.encode('ascii')
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oslinesep = os.linesep.encode('ascii')
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osname = os.name.encode('ascii')
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ospathsep = os.pathsep.encode('ascii')
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ospardir = os.pardir.encode('ascii')
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ossep = os.sep.encode('ascii')
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osaltsep = os.altsep
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if osaltsep:
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osaltsep = osaltsep.encode('ascii')
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osdevnull = os.devnull.encode('ascii')
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sysplatform = sys.platform.encode('ascii')
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sysexecutable = sys.executable
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if sysexecutable:
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sysexecutable = os.fsencode(sysexecutable)
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def maplist(*args):
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return list(map(*args))
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def rangelist(*args):
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return list(range(*args))
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def ziplist(*args):
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return list(zip(*args))
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rawinput = input
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getargspec = inspect.getfullargspec
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long = int
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if getattr(sys, 'argv', None) is not None:
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# On POSIX, the char** argv array is converted to Python str using
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# Py_DecodeLocale(). The inverse of this is Py_EncodeLocale(), which
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# isn't directly callable from Python code. In practice, os.fsencode()
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# can be used instead (this is recommended by Python's documentation
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# for sys.argv).
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#
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# On Windows, the wchar_t **argv is passed into the interpreter as-is.
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# Like POSIX, we need to emulate what Py_EncodeLocale() would do. But
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# there's an additional wrinkle. What we really want to access is the
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# ANSI codepage representation of the arguments, as this is what
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# `int main()` would receive if Python 3 didn't define `int wmain()`
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# (this is how Python 2 worked). To get that, we encode with the mbcs
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# encoding, which will pass CP_ACP to the underlying Windows API to
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# produce bytes.
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if os.name == r'nt':
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sysargv = [a.encode("mbcs", "ignore") for a in sys.argv]
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else:
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sysargv = [fsencode(a) for a in sys.argv]
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bytechr = struct.Struct('>B').pack
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byterepr = b'%r'.__mod__
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class bytestr(bytes):
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"""A bytes which mostly acts as a Python 2 str
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>>> bytestr(), bytestr(bytearray(b'foo')), bytestr(u'ascii'), bytestr(1)
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('', 'foo', 'ascii', '1')
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>>> s = bytestr(b'foo')
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>>> assert s is bytestr(s)
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__bytes__() should be called if provided:
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>>> class bytesable:
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... def __bytes__(self):
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... return b'bytes'
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>>> bytestr(bytesable())
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'bytes'
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There's no implicit conversion from non-ascii str as its encoding is
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unknown:
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>>> bytestr(chr(0x80)) # doctest: +ELLIPSIS
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Traceback (most recent call last):
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...
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UnicodeEncodeError: ...
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Comparison between bytestr and bytes should work:
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>>> assert bytestr(b'foo') == b'foo'
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>>> assert b'foo' == bytestr(b'foo')
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>>> assert b'f' in bytestr(b'foo')
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>>> assert bytestr(b'f') in b'foo'
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Sliced elements should be bytes, not integer:
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>>> s[1], s[:2]
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(b'o', b'fo')
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>>> list(s), list(reversed(s))
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([b'f', b'o', b'o'], [b'o', b'o', b'f'])
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As bytestr type isn't propagated across operations, you need to cast
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bytes to bytestr explicitly:
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>>> s = bytestr(b'foo').upper()
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>>> t = bytestr(s)
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>>> s[0], t[0]
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(70, b'F')
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Be careful to not pass a bytestr object to a function which expects
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bytearray-like behavior.
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>>> t = bytes(t) # cast to bytes
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>>> assert type(t) is bytes
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"""
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# Trick pytype into not demanding Iterable[int] be passed to __new__(),
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# since the appropriate bytes format is done internally.
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#
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# https://github.com/google/pytype/issues/500
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if TYPE_CHECKING:
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def __init__(self, s=b''):
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pass
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def __new__(cls, s=b''):
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if isinstance(s, bytestr):
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return s
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if not isinstance(
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s, (bytes, bytearray)
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) and not hasattr( # hasattr-py3-only
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s, u'__bytes__'
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):
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s = str(s).encode('ascii')
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return bytes.__new__(cls, s)
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def __getitem__(self, key):
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s = bytes.__getitem__(self, key)
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if not isinstance(s, bytes):
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s = bytechr(s)
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return s
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def __iter__(self):
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return iterbytestr(bytes.__iter__(self))
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def __repr__(self):
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return bytes.__repr__(self)[1:] # drop b''
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def iterbytestr(s):
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"""Iterate bytes as if it were a str object of Python 2"""
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return map(bytechr, s)
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def maybebytestr(s):
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"""Promote bytes to bytestr"""
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if isinstance(s, bytes):
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return bytestr(s)
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return s
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def sysbytes(s):
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"""Convert an internal str (e.g. keyword, __doc__) back to bytes
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This never raises UnicodeEncodeError, but only ASCII characters
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can be round-trip by sysstr(sysbytes(s)).
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"""
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if isinstance(s, bytes):
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return s
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return s.encode('utf-8')
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def sysstr(s):
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"""Return a keyword str to be passed to Python functions such as
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getattr() and str.encode()
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This never raises UnicodeDecodeError. Non-ascii characters are
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considered invalid and mapped to arbitrary but unique code points
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such that 'sysstr(a) != sysstr(b)' for all 'a != b'.
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"""
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if isinstance(s, builtins.str):
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return s
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return s.decode('latin-1')
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def strurl(url):
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"""Converts a bytes url back to str"""
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if isinstance(url, bytes):
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return url.decode('ascii')
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return url
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def bytesurl(url):
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"""Converts a str url to bytes by encoding in ascii"""
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if isinstance(url, str):
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return url.encode('ascii')
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return url
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def raisewithtb(exc, tb):
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"""Raise exception with the given traceback"""
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raise exc.with_traceback(tb)
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def getdoc(obj):
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"""Get docstring as bytes; may be None so gettext() won't confuse it
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with _('')"""
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doc = getattr(obj, '__doc__', None)
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if doc is None:
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return doc
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return sysbytes(doc)
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def _wrapattrfunc(f):
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@functools.wraps(f)
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def w(object, name, *args):
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return f(object, sysstr(name), *args)
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return w
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# these wrappers are automagically imported by hgloader
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delattr = _wrapattrfunc(builtins.delattr)
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getattr = _wrapattrfunc(builtins.getattr)
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hasattr = _wrapattrfunc(builtins.hasattr)
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setattr = _wrapattrfunc(builtins.setattr)
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xrange = builtins.range
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unicode = str
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def open(name, mode=b'r', buffering=-1, encoding=None):
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return builtins.open(name, sysstr(mode), buffering, encoding)
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safehasattr = _wrapattrfunc(builtins.hasattr)
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def _getoptbwrapper(orig, args, shortlist, namelist):
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"""
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Takes bytes arguments, converts them to unicode, pass them to
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getopt.getopt(), convert the returned values back to bytes and then
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return them for Python 3 compatibility as getopt.getopt() don't accepts
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bytes on Python 3.
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"""
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args = [a.decode('latin-1') for a in args]
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shortlist = shortlist.decode('latin-1')
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namelist = [a.decode('latin-1') for a in namelist]
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opts, args = orig(args, shortlist, namelist)
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opts = [(a[0].encode('latin-1'), a[1].encode('latin-1')) for a in opts]
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args = [a.encode('latin-1') for a in args]
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return opts, args
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def strkwargs(dic):
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"""
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Converts the keys of a python dictonary to str i.e. unicodes so that
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they can be passed as keyword arguments as dictionaries with bytes keys
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can't be passed as keyword arguments to functions on Python 3.
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"""
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dic = {k.decode('latin-1'): v for k, v in dic.items()}
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return dic
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def byteskwargs(dic):
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"""
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Converts keys of python dictionaries to bytes as they were converted to
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str to pass that dictonary as a keyword argument on Python 3.
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"""
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dic = {k.encode('latin-1'): v for k, v in dic.items()}
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return dic
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# TODO: handle shlex.shlex().
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def shlexsplit(s, comments=False, posix=True):
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"""
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Takes bytes argument, convert it to str i.e. unicodes, pass that into
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shlex.split(), convert the returned value to bytes and return that for
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Python 3 compatibility as shelx.split() don't accept bytes on Python 3.
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"""
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ret = shlex.split(s.decode('latin-1'), comments, posix)
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return [a.encode('latin-1') for a in ret]
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iteritems = lambda x: x.items()
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itervalues = lambda x: x.values()
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json_loads = json.loads
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isjython = sysplatform.startswith(b'java')
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isdarwin = sysplatform.startswith(b'darwin')
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islinux = sysplatform.startswith(b'linux')
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isposix = osname == b'posix'
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iswindows = osname == b'nt'
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def getoptb(args, shortlist, namelist):
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return _getoptbwrapper(getopt.getopt, args, shortlist, namelist)
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def gnugetoptb(args, shortlist, namelist):
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return _getoptbwrapper(getopt.gnu_getopt, args, shortlist, namelist)
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def mkdtemp(suffix=b'', prefix=b'tmp', dir=None):
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return tempfile.mkdtemp(suffix, prefix, dir)
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# text=True is not supported; use util.from/tonativeeol() instead
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def mkstemp(suffix=b'', prefix=b'tmp', dir=None):
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return tempfile.mkstemp(suffix, prefix, dir)
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# TemporaryFile does not support an "encoding=" argument on python2.
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# This wrapper file are always open in byte mode.
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def unnamedtempfile(mode=None, *args, **kwargs):
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if mode is None:
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mode = 'w+b'
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else:
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mode = sysstr(mode)
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assert 'b' in mode
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return tempfile.TemporaryFile(mode, *args, **kwargs)
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# NamedTemporaryFile does not support an "encoding=" argument on python2.
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# This wrapper file are always open in byte mode.
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def namedtempfile(
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mode=b'w+b', bufsize=-1, suffix=b'', prefix=b'tmp', dir=None, delete=True
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):
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mode = sysstr(mode)
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assert 'b' in mode
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return tempfile.NamedTemporaryFile(
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mode, bufsize, suffix=suffix, prefix=prefix, dir=dir, delete=delete
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)
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