+
+from ctypes import byref, windll, c_ulong
+
+from win_unicode_console.buffer import get_buffer
+
+import io
+import sys
+import time
+
+
+kernel32 = windll.kernel32
+GetStdHandle = kernel32.GetStdHandle
+ReadConsoleW = kernel32.ReadConsoleW
+WriteConsoleW = kernel32.WriteConsoleW
+GetLastError = kernel32.GetLastError
+
+
+ERROR_SUCCESS = 0
+ERROR_NOT_ENOUGH_MEMORY = 8
+ERROR_OPERATION_ABORTED = 995
+
+STDIN_HANDLE = GetStdHandle(-10)
+STDOUT_HANDLE = GetStdHandle(-11)
+STDERR_HANDLE = GetStdHandle(-12)
+
+STDIN_FILENO = 0
+STDOUT_FILENO = 1
+STDERR_FILENO = 2
+
+EOF = b"\x1a"
+
+MAX_BYTES_WRITTEN = 32767 # arbitrary because WriteConsoleW ability to write big buffers depends on heap usage
+
+
+class ReprMixin:
+ def __repr__(self):
+ modname = self.__class__.__module__
+ clsname = self.__class__.__qualname__
+ attributes = []
+ for name in ["name", "encoding"]:
+ try:
+ value = getattr(self, name)
+ except AttributeError:
+ pass
+ else:
+ attributes.append("{}={}".format(name, repr(value)))
+
+ return "<{}.{} {}>".format(modname, clsname, " ".join(attributes))
+
+
+class WindowsConsoleRawIOBase(ReprMixin, io.RawIOBase):
+ def __init__(self, name, handle, fileno):
+ self.name = name
+ self.handle = handle
+ self.file_no = fileno
+
+ def fileno(self):
+ return self.file_no
+
+ def isatty(self):
+ super().isatty() # for close check in default implementation
+ return True
+
+class WindowsConsoleRawReader(WindowsConsoleRawIOBase):
+ def readable(self):
+ return True
+
+ def readinto(self, b):
+ bytes_to_be_read = len(b)
+ if not bytes_to_be_read:
+ return 0
+ elif bytes_to_be_read % 2:
+ raise ValueError("cannot read odd number of bytes from UTF-16-LE encoded console")
+
+ buffer = get_buffer(b, writable=True)
+ code_units_to_be_read = bytes_to_be_read // 2
+ code_units_read = c_ulong()
+
+ retval = ReadConsoleW(self.handle, buffer, code_units_to_be_read, byref(code_units_read), None)
+ if GetLastError() == ERROR_OPERATION_ABORTED:
+ time.sleep(0.1) # wait for KeyboardInterrupt
+ if not retval:
+ raise OSError("Windows error {}".format(GetLastError()))
+
+ if buffer[0] == EOF:
+ return 0
+ else:
+ return 2 * code_units_read.value
+
+class WindowsConsoleRawWriter(WindowsConsoleRawIOBase):
+ def writable(self):
+ return True
+
+ @staticmethod
+ def _error_message(errno):
+ if errno == ERROR_SUCCESS:
+ return "Windows error {} (ERROR_SUCCESS); zero bytes written on nonzero input, probably just one byte given".format(errno)
+ elif errno == ERROR_NOT_ENOUGH_MEMORY:
+ return "Windows error {} (ERROR_NOT_ENOUGH_MEMORY); try to lower `win_unicode_console.streams.MAX_BYTES_WRITTEN`".format(errno)
+ else:
+ return "Windows error {}".format(errno)
+
+ def write(self, b):
+ bytes_to_be_written = len(b)
+ buffer = get_buffer(b)
+ code_units_to_be_written = min(bytes_to_be_written, MAX_BYTES_WRITTEN) // 2
+ code_units_written = c_ulong()
+
+ retval = WriteConsoleW(self.handle, buffer, code_units_to_be_written, byref(code_units_written), None)
+ bytes_written = 2 * code_units_written.value
+
+ # fixes both infinite loop of io.BufferedWriter.flush() on when the buffer has odd length
+ # and situation when WriteConsoleW refuses to write lesser that MAX_BYTES_WRITTEN bytes
+ if bytes_written == 0 != bytes_to_be_written:
+ raise OSError(self._error_message(GetLastError()))
+ else:
+ return bytes_written
+
+class TextTranscodingWrapper(ReprMixin, io.TextIOBase):
+ encoding = None
+
+ def __init__(self, base, encoding):
+ self.base = base
+ self.encoding = encoding
+
+ @property
+ def errors(self):
+ return self.base.errors
+
+ @property
+ def line_buffering(self):
+ return self.base.line_buffering
+
+ def seekable(self):
+ return self.base.seekable()
+
+ def readable(self):
+ return self.base.readable()
+
+ def writable(self):
+ return self.base.writable()
+
+ def flush(self):
+ self.base.flush()
+
+ def close(self):
+ self.base.close()
+
+ @property
+ def closed(self):
+ return self.base.closed
+
+ @property
+ def name(self):
+ return self.base.name
+
+ def fileno(self):
+ return self.base.fileno()
+
+ def isatty(self):
+ return self.base.isatty()
+
+ def write(self, s):
+ return self.base.write(s)
+
+ def tell(self):
+ return self.base.tell()
+
+ def truncate(self, pos=None):
+ return self.base.truncate(pos)
+
+ def seek(self, cookie, whence=0):
+ return self.base.seek(cookie, whence)
+
+ def read(self, size=None):
+ return self.base.read(size)
+
+ def __next__(self):
+ return next(self.base)
+
+ def readline(self, size=-1):
+ return self.base.readline(size)
+
+ @property
+ def newlines(self):
+ return self.base.newlines
+
+
+stdin_raw = WindowsConsoleRawReader("<stdin>", STDIN_HANDLE, STDIN_FILENO)
+stdout_raw = WindowsConsoleRawWriter("<stdout>", STDOUT_HANDLE, STDOUT_FILENO)
+stderr_raw = WindowsConsoleRawWriter("<stderr>", STDERR_HANDLE, STDERR_FILENO)
+
+stdin_text = io.TextIOWrapper(io.BufferedReader(stdin_raw), encoding="utf-16-le", line_buffering=True)
+stdout_text = io.TextIOWrapper(io.BufferedWriter(stdout_raw), encoding="utf-16-le", line_buffering=True)
+stderr_text = io.TextIOWrapper(io.BufferedWriter(stderr_raw), encoding="utf-16-le", line_buffering=True)
+
+stdin_text_transcoded = TextTranscodingWrapper(stdin_text, encoding="utf-8")
+stdout_text_transcoded = TextTranscodingWrapper(stdout_text, encoding="utf-8")
+stderr_text_transcoded = TextTranscodingWrapper(stderr_text, encoding="utf-8")
+
+
+def disable():
+ sys.stdin.flush()
+ sys.stdout.flush()
+ sys.stderr.flush()
+ sys.stdin = sys.__stdin__
+ sys.stdout = sys.__stdout__
+ sys.stderr = sys.__stderr__
+
+def check_stream(stream, fileno):
+ if stream is None: # e.g. with IDLE
+ return True
+
+ try:
+ _fileno = stream.fileno()
+ except io.UnsupportedOperation:
+ return False
+ else:
+ if _fileno == fileno and stream.isatty():
+ stream.flush()
+ return True
+ else:
+ return False
+
+def enable_reader(*, transcode=True):
+ # transcoding because Python tokenizer cannot handle UTF-16
+ if check_stream(sys.stdin, STDIN_FILENO):
+ if transcode:
+ sys.stdin = stdin_text_transcoded
+ else:
+ sys.stdin = stdin_text
+
+def enable_writer(*, transcode=True):
+ if check_stream(sys.stdout, STDOUT_FILENO):
+ if transcode:
+ sys.stdout = stdout_text_transcoded
+ else:
+ sys.stdout = stdout_text
+
+def enable_error_writer(*, transcode=True):
+ if check_stream(sys.stderr, STDERR_FILENO):
+ if transcode:
+ sys.stderr = stderr_text_transcoded
+ else:
+ sys.stderr = stderr_text
+
+enablers = {"stdin": enable_reader, "stdout": enable_writer, "stderr": enable_error_writer}
+
+def enable(streams=("stdin", "stdout", "stderr"), *, transcode=frozenset(enablers.keys())):
+ if transcode is True:
+ transcode = enablers.keys()
+ elif transcode is False:
+ transcode = set()
+
+ if not set(streams) | set(transcode) <= enablers.keys():
+ raise ValueError("invalid stream names")
+
+ for stream in streams:
+ enablers[stream](transcode=(stream in transcode))
+
projects / wikipedia-api-cdsw / commitdiff