627 lines
18 KiB
Python
627 lines
18 KiB
Python
import codecs
|
|
import io
|
|
import os
|
|
import re
|
|
import sys
|
|
import typing as t
|
|
from weakref import WeakKeyDictionary
|
|
|
|
CYGWIN = sys.platform.startswith("cygwin")
|
|
MSYS2 = sys.platform.startswith("win") and ("GCC" in sys.version)
|
|
# Determine local App Engine environment, per Google's own suggestion
|
|
APP_ENGINE = "APPENGINE_RUNTIME" in os.environ and "Development/" in os.environ.get(
|
|
"SERVER_SOFTWARE", ""
|
|
)
|
|
WIN = sys.platform.startswith("win") and not APP_ENGINE and not MSYS2
|
|
auto_wrap_for_ansi: t.Optional[t.Callable[[t.TextIO], t.TextIO]] = None
|
|
_ansi_re = re.compile(r"\033\[[;?0-9]*[a-zA-Z]")
|
|
|
|
|
|
def get_filesystem_encoding() -> str:
|
|
return sys.getfilesystemencoding() or sys.getdefaultencoding()
|
|
|
|
|
|
def _make_text_stream(
|
|
stream: t.BinaryIO,
|
|
encoding: t.Optional[str],
|
|
errors: t.Optional[str],
|
|
force_readable: bool = False,
|
|
force_writable: bool = False,
|
|
) -> t.TextIO:
|
|
if encoding is None:
|
|
encoding = get_best_encoding(stream)
|
|
if errors is None:
|
|
errors = "replace"
|
|
return _NonClosingTextIOWrapper(
|
|
stream,
|
|
encoding,
|
|
errors,
|
|
line_buffering=True,
|
|
force_readable=force_readable,
|
|
force_writable=force_writable,
|
|
)
|
|
|
|
|
|
def is_ascii_encoding(encoding: str) -> bool:
|
|
"""Checks if a given encoding is ascii."""
|
|
try:
|
|
return codecs.lookup(encoding).name == "ascii"
|
|
except LookupError:
|
|
return False
|
|
|
|
|
|
def get_best_encoding(stream: t.IO) -> str:
|
|
"""Returns the default stream encoding if not found."""
|
|
rv = getattr(stream, "encoding", None) or sys.getdefaultencoding()
|
|
if is_ascii_encoding(rv):
|
|
return "utf-8"
|
|
return rv
|
|
|
|
|
|
class _NonClosingTextIOWrapper(io.TextIOWrapper):
|
|
def __init__(
|
|
self,
|
|
stream: t.BinaryIO,
|
|
encoding: t.Optional[str],
|
|
errors: t.Optional[str],
|
|
force_readable: bool = False,
|
|
force_writable: bool = False,
|
|
**extra: t.Any,
|
|
) -> None:
|
|
self._stream = stream = t.cast(
|
|
t.BinaryIO, _FixupStream(stream, force_readable, force_writable)
|
|
)
|
|
super().__init__(stream, encoding, errors, **extra)
|
|
|
|
def __del__(self) -> None:
|
|
try:
|
|
self.detach()
|
|
except Exception:
|
|
pass
|
|
|
|
def isatty(self) -> bool:
|
|
# https://bitbucket.org/pypy/pypy/issue/1803
|
|
return self._stream.isatty()
|
|
|
|
|
|
class _FixupStream:
|
|
"""The new io interface needs more from streams than streams
|
|
traditionally implement. As such, this fix-up code is necessary in
|
|
some circumstances.
|
|
|
|
The forcing of readable and writable flags are there because some tools
|
|
put badly patched objects on sys (one such offender are certain version
|
|
of jupyter notebook).
|
|
"""
|
|
|
|
def __init__(
|
|
self,
|
|
stream: t.BinaryIO,
|
|
force_readable: bool = False,
|
|
force_writable: bool = False,
|
|
):
|
|
self._stream = stream
|
|
self._force_readable = force_readable
|
|
self._force_writable = force_writable
|
|
|
|
def __getattr__(self, name: str) -> t.Any:
|
|
return getattr(self._stream, name)
|
|
|
|
def read1(self, size: int) -> bytes:
|
|
f = getattr(self._stream, "read1", None)
|
|
|
|
if f is not None:
|
|
return t.cast(bytes, f(size))
|
|
|
|
return self._stream.read(size)
|
|
|
|
def readable(self) -> bool:
|
|
if self._force_readable:
|
|
return True
|
|
x = getattr(self._stream, "readable", None)
|
|
if x is not None:
|
|
return t.cast(bool, x())
|
|
try:
|
|
self._stream.read(0)
|
|
except Exception:
|
|
return False
|
|
return True
|
|
|
|
def writable(self) -> bool:
|
|
if self._force_writable:
|
|
return True
|
|
x = getattr(self._stream, "writable", None)
|
|
if x is not None:
|
|
return t.cast(bool, x())
|
|
try:
|
|
self._stream.write("") # type: ignore
|
|
except Exception:
|
|
try:
|
|
self._stream.write(b"")
|
|
except Exception:
|
|
return False
|
|
return True
|
|
|
|
def seekable(self) -> bool:
|
|
x = getattr(self._stream, "seekable", None)
|
|
if x is not None:
|
|
return t.cast(bool, x())
|
|
try:
|
|
self._stream.seek(self._stream.tell())
|
|
except Exception:
|
|
return False
|
|
return True
|
|
|
|
|
|
def _is_binary_reader(stream: t.IO, default: bool = False) -> bool:
|
|
try:
|
|
return isinstance(stream.read(0), bytes)
|
|
except Exception:
|
|
return default
|
|
# This happens in some cases where the stream was already
|
|
# closed. In this case, we assume the default.
|
|
|
|
|
|
def _is_binary_writer(stream: t.IO, default: bool = False) -> bool:
|
|
try:
|
|
stream.write(b"")
|
|
except Exception:
|
|
try:
|
|
stream.write("")
|
|
return False
|
|
except Exception:
|
|
pass
|
|
return default
|
|
return True
|
|
|
|
|
|
def _find_binary_reader(stream: t.IO) -> t.Optional[t.BinaryIO]:
|
|
# We need to figure out if the given stream is already binary.
|
|
# This can happen because the official docs recommend detaching
|
|
# the streams to get binary streams. Some code might do this, so
|
|
# we need to deal with this case explicitly.
|
|
if _is_binary_reader(stream, False):
|
|
return t.cast(t.BinaryIO, stream)
|
|
|
|
buf = getattr(stream, "buffer", None)
|
|
|
|
# Same situation here; this time we assume that the buffer is
|
|
# actually binary in case it's closed.
|
|
if buf is not None and _is_binary_reader(buf, True):
|
|
return t.cast(t.BinaryIO, buf)
|
|
|
|
return None
|
|
|
|
|
|
def _find_binary_writer(stream: t.IO) -> t.Optional[t.BinaryIO]:
|
|
# We need to figure out if the given stream is already binary.
|
|
# This can happen because the official docs recommend detaching
|
|
# the streams to get binary streams. Some code might do this, so
|
|
# we need to deal with this case explicitly.
|
|
if _is_binary_writer(stream, False):
|
|
return t.cast(t.BinaryIO, stream)
|
|
|
|
buf = getattr(stream, "buffer", None)
|
|
|
|
# Same situation here; this time we assume that the buffer is
|
|
# actually binary in case it's closed.
|
|
if buf is not None and _is_binary_writer(buf, True):
|
|
return t.cast(t.BinaryIO, buf)
|
|
|
|
return None
|
|
|
|
|
|
def _stream_is_misconfigured(stream: t.TextIO) -> bool:
|
|
"""A stream is misconfigured if its encoding is ASCII."""
|
|
# If the stream does not have an encoding set, we assume it's set
|
|
# to ASCII. This appears to happen in certain unittest
|
|
# environments. It's not quite clear what the correct behavior is
|
|
# but this at least will force Click to recover somehow.
|
|
return is_ascii_encoding(getattr(stream, "encoding", None) or "ascii")
|
|
|
|
|
|
def _is_compat_stream_attr(stream: t.TextIO, attr: str, value: t.Optional[str]) -> bool:
|
|
"""A stream attribute is compatible if it is equal to the
|
|
desired value or the desired value is unset and the attribute
|
|
has a value.
|
|
"""
|
|
stream_value = getattr(stream, attr, None)
|
|
return stream_value == value or (value is None and stream_value is not None)
|
|
|
|
|
|
def _is_compatible_text_stream(
|
|
stream: t.TextIO, encoding: t.Optional[str], errors: t.Optional[str]
|
|
) -> bool:
|
|
"""Check if a stream's encoding and errors attributes are
|
|
compatible with the desired values.
|
|
"""
|
|
return _is_compat_stream_attr(
|
|
stream, "encoding", encoding
|
|
) and _is_compat_stream_attr(stream, "errors", errors)
|
|
|
|
|
|
def _force_correct_text_stream(
|
|
text_stream: t.IO,
|
|
encoding: t.Optional[str],
|
|
errors: t.Optional[str],
|
|
is_binary: t.Callable[[t.IO, bool], bool],
|
|
find_binary: t.Callable[[t.IO], t.Optional[t.BinaryIO]],
|
|
force_readable: bool = False,
|
|
force_writable: bool = False,
|
|
) -> t.TextIO:
|
|
if is_binary(text_stream, False):
|
|
binary_reader = t.cast(t.BinaryIO, text_stream)
|
|
else:
|
|
text_stream = t.cast(t.TextIO, text_stream)
|
|
# If the stream looks compatible, and won't default to a
|
|
# misconfigured ascii encoding, return it as-is.
|
|
if _is_compatible_text_stream(text_stream, encoding, errors) and not (
|
|
encoding is None and _stream_is_misconfigured(text_stream)
|
|
):
|
|
return text_stream
|
|
|
|
# Otherwise, get the underlying binary reader.
|
|
possible_binary_reader = find_binary(text_stream)
|
|
|
|
# If that's not possible, silently use the original reader
|
|
# and get mojibake instead of exceptions.
|
|
if possible_binary_reader is None:
|
|
return text_stream
|
|
|
|
binary_reader = possible_binary_reader
|
|
|
|
# Default errors to replace instead of strict in order to get
|
|
# something that works.
|
|
if errors is None:
|
|
errors = "replace"
|
|
|
|
# Wrap the binary stream in a text stream with the correct
|
|
# encoding parameters.
|
|
return _make_text_stream(
|
|
binary_reader,
|
|
encoding,
|
|
errors,
|
|
force_readable=force_readable,
|
|
force_writable=force_writable,
|
|
)
|
|
|
|
|
|
def _force_correct_text_reader(
|
|
text_reader: t.IO,
|
|
encoding: t.Optional[str],
|
|
errors: t.Optional[str],
|
|
force_readable: bool = False,
|
|
) -> t.TextIO:
|
|
return _force_correct_text_stream(
|
|
text_reader,
|
|
encoding,
|
|
errors,
|
|
_is_binary_reader,
|
|
_find_binary_reader,
|
|
force_readable=force_readable,
|
|
)
|
|
|
|
|
|
def _force_correct_text_writer(
|
|
text_writer: t.IO,
|
|
encoding: t.Optional[str],
|
|
errors: t.Optional[str],
|
|
force_writable: bool = False,
|
|
) -> t.TextIO:
|
|
return _force_correct_text_stream(
|
|
text_writer,
|
|
encoding,
|
|
errors,
|
|
_is_binary_writer,
|
|
_find_binary_writer,
|
|
force_writable=force_writable,
|
|
)
|
|
|
|
|
|
def get_binary_stdin() -> t.BinaryIO:
|
|
reader = _find_binary_reader(sys.stdin)
|
|
if reader is None:
|
|
raise RuntimeError("Was not able to determine binary stream for sys.stdin.")
|
|
return reader
|
|
|
|
|
|
def get_binary_stdout() -> t.BinaryIO:
|
|
writer = _find_binary_writer(sys.stdout)
|
|
if writer is None:
|
|
raise RuntimeError("Was not able to determine binary stream for sys.stdout.")
|
|
return writer
|
|
|
|
|
|
def get_binary_stderr() -> t.BinaryIO:
|
|
writer = _find_binary_writer(sys.stderr)
|
|
if writer is None:
|
|
raise RuntimeError("Was not able to determine binary stream for sys.stderr.")
|
|
return writer
|
|
|
|
|
|
def get_text_stdin(
|
|
encoding: t.Optional[str] = None, errors: t.Optional[str] = None
|
|
) -> t.TextIO:
|
|
rv = _get_windows_console_stream(sys.stdin, encoding, errors)
|
|
if rv is not None:
|
|
return rv
|
|
return _force_correct_text_reader(sys.stdin, encoding, errors, force_readable=True)
|
|
|
|
|
|
def get_text_stdout(
|
|
encoding: t.Optional[str] = None, errors: t.Optional[str] = None
|
|
) -> t.TextIO:
|
|
rv = _get_windows_console_stream(sys.stdout, encoding, errors)
|
|
if rv is not None:
|
|
return rv
|
|
return _force_correct_text_writer(sys.stdout, encoding, errors, force_writable=True)
|
|
|
|
|
|
def get_text_stderr(
|
|
encoding: t.Optional[str] = None, errors: t.Optional[str] = None
|
|
) -> t.TextIO:
|
|
rv = _get_windows_console_stream(sys.stderr, encoding, errors)
|
|
if rv is not None:
|
|
return rv
|
|
return _force_correct_text_writer(sys.stderr, encoding, errors, force_writable=True)
|
|
|
|
|
|
def _wrap_io_open(
|
|
file: t.Union[str, os.PathLike, int],
|
|
mode: str,
|
|
encoding: t.Optional[str],
|
|
errors: t.Optional[str],
|
|
) -> t.IO:
|
|
"""Handles not passing ``encoding`` and ``errors`` in binary mode."""
|
|
if "b" in mode:
|
|
return open(file, mode)
|
|
|
|
return open(file, mode, encoding=encoding, errors=errors)
|
|
|
|
|
|
def open_stream(
|
|
filename: str,
|
|
mode: str = "r",
|
|
encoding: t.Optional[str] = None,
|
|
errors: t.Optional[str] = "strict",
|
|
atomic: bool = False,
|
|
) -> t.Tuple[t.IO, bool]:
|
|
binary = "b" in mode
|
|
|
|
# Standard streams first. These are simple because they ignore the
|
|
# atomic flag. Use fsdecode to handle Path("-").
|
|
if os.fsdecode(filename) == "-":
|
|
if any(m in mode for m in ["w", "a", "x"]):
|
|
if binary:
|
|
return get_binary_stdout(), False
|
|
return get_text_stdout(encoding=encoding, errors=errors), False
|
|
if binary:
|
|
return get_binary_stdin(), False
|
|
return get_text_stdin(encoding=encoding, errors=errors), False
|
|
|
|
# Non-atomic writes directly go out through the regular open functions.
|
|
if not atomic:
|
|
return _wrap_io_open(filename, mode, encoding, errors), True
|
|
|
|
# Some usability stuff for atomic writes
|
|
if "a" in mode:
|
|
raise ValueError(
|
|
"Appending to an existing file is not supported, because that"
|
|
" would involve an expensive `copy`-operation to a temporary"
|
|
" file. Open the file in normal `w`-mode and copy explicitly"
|
|
" if that's what you're after."
|
|
)
|
|
if "x" in mode:
|
|
raise ValueError("Use the `overwrite`-parameter instead.")
|
|
if "w" not in mode:
|
|
raise ValueError("Atomic writes only make sense with `w`-mode.")
|
|
|
|
# Atomic writes are more complicated. They work by opening a file
|
|
# as a proxy in the same folder and then using the fdopen
|
|
# functionality to wrap it in a Python file. Then we wrap it in an
|
|
# atomic file that moves the file over on close.
|
|
import errno
|
|
import random
|
|
|
|
try:
|
|
perm: t.Optional[int] = os.stat(filename).st_mode
|
|
except OSError:
|
|
perm = None
|
|
|
|
flags = os.O_RDWR | os.O_CREAT | os.O_EXCL
|
|
|
|
if binary:
|
|
flags |= getattr(os, "O_BINARY", 0)
|
|
|
|
while True:
|
|
tmp_filename = os.path.join(
|
|
os.path.dirname(filename),
|
|
f".__atomic-write{random.randrange(1 << 32):08x}",
|
|
)
|
|
try:
|
|
fd = os.open(tmp_filename, flags, 0o666 if perm is None else perm)
|
|
break
|
|
except OSError as e:
|
|
if e.errno == errno.EEXIST or (
|
|
os.name == "nt"
|
|
and e.errno == errno.EACCES
|
|
and os.path.isdir(e.filename)
|
|
and os.access(e.filename, os.W_OK)
|
|
):
|
|
continue
|
|
raise
|
|
|
|
if perm is not None:
|
|
os.chmod(tmp_filename, perm) # in case perm includes bits in umask
|
|
|
|
f = _wrap_io_open(fd, mode, encoding, errors)
|
|
af = _AtomicFile(f, tmp_filename, os.path.realpath(filename))
|
|
return t.cast(t.IO, af), True
|
|
|
|
|
|
class _AtomicFile:
|
|
def __init__(self, f: t.IO, tmp_filename: str, real_filename: str) -> None:
|
|
self._f = f
|
|
self._tmp_filename = tmp_filename
|
|
self._real_filename = real_filename
|
|
self.closed = False
|
|
|
|
@property
|
|
def name(self) -> str:
|
|
return self._real_filename
|
|
|
|
def close(self, delete: bool = False) -> None:
|
|
if self.closed:
|
|
return
|
|
self._f.close()
|
|
os.replace(self._tmp_filename, self._real_filename)
|
|
self.closed = True
|
|
|
|
def __getattr__(self, name: str) -> t.Any:
|
|
return getattr(self._f, name)
|
|
|
|
def __enter__(self) -> "_AtomicFile":
|
|
return self
|
|
|
|
def __exit__(self, exc_type, exc_value, tb): # type: ignore
|
|
self.close(delete=exc_type is not None)
|
|
|
|
def __repr__(self) -> str:
|
|
return repr(self._f)
|
|
|
|
|
|
def strip_ansi(value: str) -> str:
|
|
return _ansi_re.sub("", value)
|
|
|
|
|
|
def _is_jupyter_kernel_output(stream: t.IO) -> bool:
|
|
while isinstance(stream, (_FixupStream, _NonClosingTextIOWrapper)):
|
|
stream = stream._stream
|
|
|
|
return stream.__class__.__module__.startswith("ipykernel.")
|
|
|
|
|
|
def should_strip_ansi(
|
|
stream: t.Optional[t.IO] = None, color: t.Optional[bool] = None
|
|
) -> bool:
|
|
if color is None:
|
|
if stream is None:
|
|
stream = sys.stdin
|
|
return not isatty(stream) and not _is_jupyter_kernel_output(stream)
|
|
return not color
|
|
|
|
|
|
# On Windows, wrap the output streams with colorama to support ANSI
|
|
# color codes.
|
|
# NOTE: double check is needed so mypy does not analyze this on Linux
|
|
if sys.platform.startswith("win") and WIN:
|
|
from ._winconsole import _get_windows_console_stream
|
|
|
|
def _get_argv_encoding() -> str:
|
|
import locale
|
|
|
|
return locale.getpreferredencoding()
|
|
|
|
_ansi_stream_wrappers: t.MutableMapping[t.TextIO, t.TextIO] = WeakKeyDictionary()
|
|
|
|
def auto_wrap_for_ansi(
|
|
stream: t.TextIO, color: t.Optional[bool] = None
|
|
) -> t.TextIO:
|
|
"""Support ANSI color and style codes on Windows by wrapping a
|
|
stream with colorama.
|
|
"""
|
|
try:
|
|
cached = _ansi_stream_wrappers.get(stream)
|
|
except Exception:
|
|
cached = None
|
|
|
|
if cached is not None:
|
|
return cached
|
|
|
|
import colorama
|
|
|
|
strip = should_strip_ansi(stream, color)
|
|
ansi_wrapper = colorama.AnsiToWin32(stream, strip=strip)
|
|
rv = t.cast(t.TextIO, ansi_wrapper.stream)
|
|
_write = rv.write
|
|
|
|
def _safe_write(s):
|
|
try:
|
|
return _write(s)
|
|
except BaseException:
|
|
ansi_wrapper.reset_all()
|
|
raise
|
|
|
|
rv.write = _safe_write
|
|
|
|
try:
|
|
_ansi_stream_wrappers[stream] = rv
|
|
except Exception:
|
|
pass
|
|
|
|
return rv
|
|
|
|
else:
|
|
|
|
def _get_argv_encoding() -> str:
|
|
return getattr(sys.stdin, "encoding", None) or get_filesystem_encoding()
|
|
|
|
def _get_windows_console_stream(
|
|
f: t.TextIO, encoding: t.Optional[str], errors: t.Optional[str]
|
|
) -> t.Optional[t.TextIO]:
|
|
return None
|
|
|
|
|
|
def term_len(x: str) -> int:
|
|
return len(strip_ansi(x))
|
|
|
|
|
|
def isatty(stream: t.IO) -> bool:
|
|
try:
|
|
return stream.isatty()
|
|
except Exception:
|
|
return False
|
|
|
|
|
|
def _make_cached_stream_func(
|
|
src_func: t.Callable[[], t.TextIO], wrapper_func: t.Callable[[], t.TextIO]
|
|
) -> t.Callable[[], t.TextIO]:
|
|
cache: t.MutableMapping[t.TextIO, t.TextIO] = WeakKeyDictionary()
|
|
|
|
def func() -> t.TextIO:
|
|
stream = src_func()
|
|
try:
|
|
rv = cache.get(stream)
|
|
except Exception:
|
|
rv = None
|
|
if rv is not None:
|
|
return rv
|
|
rv = wrapper_func()
|
|
try:
|
|
cache[stream] = rv
|
|
except Exception:
|
|
pass
|
|
return rv
|
|
|
|
return func
|
|
|
|
|
|
_default_text_stdin = _make_cached_stream_func(lambda: sys.stdin, get_text_stdin)
|
|
_default_text_stdout = _make_cached_stream_func(lambda: sys.stdout, get_text_stdout)
|
|
_default_text_stderr = _make_cached_stream_func(lambda: sys.stderr, get_text_stderr)
|
|
|
|
|
|
binary_streams: t.Mapping[str, t.Callable[[], t.BinaryIO]] = {
|
|
"stdin": get_binary_stdin,
|
|
"stdout": get_binary_stdout,
|
|
"stderr": get_binary_stderr,
|
|
}
|
|
|
|
text_streams: t.Mapping[
|
|
str, t.Callable[[t.Optional[str], t.Optional[str]], t.TextIO]
|
|
] = {
|
|
"stdin": get_text_stdin,
|
|
"stdout": get_text_stdout,
|
|
"stderr": get_text_stderr,
|
|
}
|