280 lines
7.7 KiB
Python
280 lines
7.7 KiB
Python
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# This module is based on the excellent work by Adam Bartoš who
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# provided a lot of what went into the implementation here in
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# the discussion to issue1602 in the Python bug tracker.
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#
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# There are some general differences in regards to how this works
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# compared to the original patches as we do not need to patch
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# the entire interpreter but just work in our little world of
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# echo and prompt.
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import io
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import sys
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import time
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import typing as t
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from ctypes import byref
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from ctypes import c_char
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from ctypes import c_char_p
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from ctypes import c_int
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from ctypes import c_ssize_t
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from ctypes import c_ulong
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from ctypes import c_void_p
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from ctypes import POINTER
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from ctypes import py_object
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from ctypes import Structure
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from ctypes.wintypes import DWORD
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from ctypes.wintypes import HANDLE
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from ctypes.wintypes import LPCWSTR
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from ctypes.wintypes import LPWSTR
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from ._compat import _NonClosingTextIOWrapper
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assert sys.platform == "win32"
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import msvcrt # noqa: E402
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from ctypes import windll # noqa: E402
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from ctypes import WINFUNCTYPE # noqa: E402
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c_ssize_p = POINTER(c_ssize_t)
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kernel32 = windll.kernel32
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GetStdHandle = kernel32.GetStdHandle
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ReadConsoleW = kernel32.ReadConsoleW
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WriteConsoleW = kernel32.WriteConsoleW
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GetConsoleMode = kernel32.GetConsoleMode
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GetLastError = kernel32.GetLastError
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GetCommandLineW = WINFUNCTYPE(LPWSTR)(("GetCommandLineW", windll.kernel32))
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CommandLineToArgvW = WINFUNCTYPE(POINTER(LPWSTR), LPCWSTR, POINTER(c_int))(
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("CommandLineToArgvW", windll.shell32)
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)
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LocalFree = WINFUNCTYPE(c_void_p, c_void_p)(("LocalFree", windll.kernel32))
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STDIN_HANDLE = GetStdHandle(-10)
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STDOUT_HANDLE = GetStdHandle(-11)
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STDERR_HANDLE = GetStdHandle(-12)
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PyBUF_SIMPLE = 0
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PyBUF_WRITABLE = 1
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ERROR_SUCCESS = 0
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ERROR_NOT_ENOUGH_MEMORY = 8
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ERROR_OPERATION_ABORTED = 995
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STDIN_FILENO = 0
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STDOUT_FILENO = 1
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STDERR_FILENO = 2
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EOF = b"\x1a"
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MAX_BYTES_WRITTEN = 32767
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try:
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from ctypes import pythonapi
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except ImportError:
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# On PyPy we cannot get buffers so our ability to operate here is
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# severely limited.
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get_buffer = None
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else:
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class Py_buffer(Structure):
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_fields_ = [
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("buf", c_void_p),
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("obj", py_object),
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("len", c_ssize_t),
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("itemsize", c_ssize_t),
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("readonly", c_int),
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("ndim", c_int),
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("format", c_char_p),
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("shape", c_ssize_p),
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("strides", c_ssize_p),
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("suboffsets", c_ssize_p),
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("internal", c_void_p),
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]
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PyObject_GetBuffer = pythonapi.PyObject_GetBuffer
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PyBuffer_Release = pythonapi.PyBuffer_Release
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def get_buffer(obj, writable=False):
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buf = Py_buffer()
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flags = PyBUF_WRITABLE if writable else PyBUF_SIMPLE
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PyObject_GetBuffer(py_object(obj), byref(buf), flags)
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try:
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buffer_type = c_char * buf.len
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return buffer_type.from_address(buf.buf)
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finally:
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PyBuffer_Release(byref(buf))
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class _WindowsConsoleRawIOBase(io.RawIOBase):
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def __init__(self, handle):
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self.handle = handle
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def isatty(self):
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super().isatty()
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return True
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class _WindowsConsoleReader(_WindowsConsoleRawIOBase):
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def readable(self):
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return True
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def readinto(self, b):
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bytes_to_be_read = len(b)
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if not bytes_to_be_read:
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return 0
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elif bytes_to_be_read % 2:
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raise ValueError(
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"cannot read odd number of bytes from UTF-16-LE encoded console"
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)
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buffer = get_buffer(b, writable=True)
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code_units_to_be_read = bytes_to_be_read // 2
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code_units_read = c_ulong()
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rv = ReadConsoleW(
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HANDLE(self.handle),
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buffer,
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code_units_to_be_read,
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byref(code_units_read),
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None,
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)
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if GetLastError() == ERROR_OPERATION_ABORTED:
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# wait for KeyboardInterrupt
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time.sleep(0.1)
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if not rv:
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raise OSError(f"Windows error: {GetLastError()}")
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if buffer[0] == EOF:
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return 0
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return 2 * code_units_read.value
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class _WindowsConsoleWriter(_WindowsConsoleRawIOBase):
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def writable(self):
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return True
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@staticmethod
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def _get_error_message(errno):
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if errno == ERROR_SUCCESS:
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return "ERROR_SUCCESS"
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elif errno == ERROR_NOT_ENOUGH_MEMORY:
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return "ERROR_NOT_ENOUGH_MEMORY"
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return f"Windows error {errno}"
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def write(self, b):
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bytes_to_be_written = len(b)
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buf = get_buffer(b)
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code_units_to_be_written = min(bytes_to_be_written, MAX_BYTES_WRITTEN) // 2
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code_units_written = c_ulong()
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WriteConsoleW(
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HANDLE(self.handle),
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buf,
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code_units_to_be_written,
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byref(code_units_written),
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None,
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)
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bytes_written = 2 * code_units_written.value
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if bytes_written == 0 and bytes_to_be_written > 0:
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raise OSError(self._get_error_message(GetLastError()))
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return bytes_written
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class ConsoleStream:
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def __init__(self, text_stream: t.TextIO, byte_stream: t.BinaryIO) -> None:
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self._text_stream = text_stream
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self.buffer = byte_stream
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@property
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def name(self) -> str:
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return self.buffer.name
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def write(self, x: t.AnyStr) -> int:
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if isinstance(x, str):
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return self._text_stream.write(x)
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try:
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self.flush()
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except Exception:
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pass
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return self.buffer.write(x)
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def writelines(self, lines: t.Iterable[t.AnyStr]) -> None:
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for line in lines:
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self.write(line)
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def __getattr__(self, name: str) -> t.Any:
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return getattr(self._text_stream, name)
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def isatty(self) -> bool:
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return self.buffer.isatty()
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def __repr__(self):
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return f"<ConsoleStream name={self.name!r} encoding={self.encoding!r}>"
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def _get_text_stdin(buffer_stream: t.BinaryIO) -> t.TextIO:
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text_stream = _NonClosingTextIOWrapper(
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io.BufferedReader(_WindowsConsoleReader(STDIN_HANDLE)),
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"utf-16-le",
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"strict",
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line_buffering=True,
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)
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return t.cast(t.TextIO, ConsoleStream(text_stream, buffer_stream))
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def _get_text_stdout(buffer_stream: t.BinaryIO) -> t.TextIO:
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text_stream = _NonClosingTextIOWrapper(
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io.BufferedWriter(_WindowsConsoleWriter(STDOUT_HANDLE)),
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"utf-16-le",
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"strict",
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line_buffering=True,
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)
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return t.cast(t.TextIO, ConsoleStream(text_stream, buffer_stream))
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def _get_text_stderr(buffer_stream: t.BinaryIO) -> t.TextIO:
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text_stream = _NonClosingTextIOWrapper(
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io.BufferedWriter(_WindowsConsoleWriter(STDERR_HANDLE)),
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"utf-16-le",
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"strict",
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line_buffering=True,
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)
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return t.cast(t.TextIO, ConsoleStream(text_stream, buffer_stream))
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_stream_factories: t.Mapping[int, t.Callable[[t.BinaryIO], t.TextIO]] = {
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0: _get_text_stdin,
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1: _get_text_stdout,
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2: _get_text_stderr,
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}
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def _is_console(f: t.TextIO) -> bool:
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if not hasattr(f, "fileno"):
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return False
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try:
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fileno = f.fileno()
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except (OSError, io.UnsupportedOperation):
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return False
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handle = msvcrt.get_osfhandle(fileno)
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return bool(GetConsoleMode(handle, byref(DWORD())))
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def _get_windows_console_stream(
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f: t.TextIO, encoding: t.Optional[str], errors: t.Optional[str]
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) -> t.Optional[t.TextIO]:
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if (
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get_buffer is not None
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and encoding in {"utf-16-le", None}
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and errors in {"strict", None}
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and _is_console(f)
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):
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func = _stream_factories.get(f.fileno())
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if func is not None:
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b = getattr(f, "buffer", None)
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if b is None:
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return None
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return func(b)
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