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