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Diffstat (limited to 'src/prompt_toolkit/input/win32.py')
| -rw-r--r-- | src/prompt_toolkit/input/win32.py | 757 |
1 files changed, 757 insertions, 0 deletions
diff --git a/src/prompt_toolkit/input/win32.py b/src/prompt_toolkit/input/win32.py new file mode 100644 index 0000000..db3fa2b --- /dev/null +++ b/src/prompt_toolkit/input/win32.py @@ -0,0 +1,757 @@ +import os +import sys +from abc import abstractmethod +from contextlib import contextmanager + +from prompt_toolkit.eventloop import get_event_loop + +from ..utils import SPHINX_AUTODOC_RUNNING + +assert sys.platform == "win32" + +# Do not import win32-specific stuff when generating documentation. +# Otherwise RTD would be unable to generate docs for this module. +if not SPHINX_AUTODOC_RUNNING: + import msvcrt + from ctypes import windll + +from ctypes import Array, pointer +from ctypes.wintypes import DWORD, HANDLE +from typing import ( + Callable, + ContextManager, + Dict, + Iterable, + Iterator, + List, + Optional, + TextIO, +) + +from prompt_toolkit.eventloop import run_in_executor_with_context +from prompt_toolkit.eventloop.win32 import create_win32_event, wait_for_handles +from prompt_toolkit.key_binding.key_processor import KeyPress +from prompt_toolkit.keys import Keys +from prompt_toolkit.mouse_events import MouseButton, MouseEventType +from prompt_toolkit.win32_types import ( + INPUT_RECORD, + KEY_EVENT_RECORD, + MOUSE_EVENT_RECORD, + STD_INPUT_HANDLE, + EventTypes, +) + +from .ansi_escape_sequences import REVERSE_ANSI_SEQUENCES +from .base import Input + +__all__ = [ + "Win32Input", + "ConsoleInputReader", + "raw_mode", + "cooked_mode", + "attach_win32_input", + "detach_win32_input", +] + +# Win32 Constants for MOUSE_EVENT_RECORD. +# See: https://docs.microsoft.com/en-us/windows/console/mouse-event-record-str +FROM_LEFT_1ST_BUTTON_PRESSED = 0x1 +RIGHTMOST_BUTTON_PRESSED = 0x2 +MOUSE_MOVED = 0x0001 +MOUSE_WHEELED = 0x0004 + + +class _Win32InputBase(Input): + """ + Base class for `Win32Input` and `Win32PipeInput`. + """ + + def __init__(self) -> None: + self.win32_handles = _Win32Handles() + + @property + @abstractmethod + def handle(self) -> HANDLE: + pass + + +class Win32Input(_Win32InputBase): + """ + `Input` class that reads from the Windows console. + """ + + def __init__(self, stdin: Optional[TextIO] = None) -> None: + super().__init__() + self.console_input_reader = ConsoleInputReader() + + def attach(self, input_ready_callback: Callable[[], None]) -> ContextManager[None]: + """ + Return a context manager that makes this input active in the current + event loop. + """ + return attach_win32_input(self, input_ready_callback) + + def detach(self) -> ContextManager[None]: + """ + Return a context manager that makes sure that this input is not active + in the current event loop. + """ + return detach_win32_input(self) + + def read_keys(self) -> List[KeyPress]: + return list(self.console_input_reader.read()) + + def flush(self) -> None: + pass + + @property + def closed(self) -> bool: + return False + + def raw_mode(self) -> ContextManager[None]: + return raw_mode() + + def cooked_mode(self) -> ContextManager[None]: + return cooked_mode() + + def fileno(self) -> int: + # The windows console doesn't depend on the file handle, so + # this is not used for the event loop (which uses the + # handle instead). But it's used in `Application.run_system_command` + # which opens a subprocess with a given stdin/stdout. + return sys.stdin.fileno() + + def typeahead_hash(self) -> str: + return "win32-input" + + def close(self) -> None: + self.console_input_reader.close() + + @property + def handle(self) -> HANDLE: + return self.console_input_reader.handle + + +class ConsoleInputReader: + """ + :param recognize_paste: When True, try to discover paste actions and turn + the event into a BracketedPaste. + """ + + # Keys with character data. + mappings = { + b"\x1b": Keys.Escape, + b"\x00": Keys.ControlSpace, # Control-Space (Also for Ctrl-@) + b"\x01": Keys.ControlA, # Control-A (home) + b"\x02": Keys.ControlB, # Control-B (emacs cursor left) + b"\x03": Keys.ControlC, # Control-C (interrupt) + b"\x04": Keys.ControlD, # Control-D (exit) + b"\x05": Keys.ControlE, # Control-E (end) + b"\x06": Keys.ControlF, # Control-F (cursor forward) + b"\x07": Keys.ControlG, # Control-G + b"\x08": Keys.ControlH, # Control-H (8) (Identical to '\b') + b"\x09": Keys.ControlI, # Control-I (9) (Identical to '\t') + b"\x0a": Keys.ControlJ, # Control-J (10) (Identical to '\n') + b"\x0b": Keys.ControlK, # Control-K (delete until end of line; vertical tab) + b"\x0c": Keys.ControlL, # Control-L (clear; form feed) + b"\x0d": Keys.ControlM, # Control-M (enter) + b"\x0e": Keys.ControlN, # Control-N (14) (history forward) + b"\x0f": Keys.ControlO, # Control-O (15) + b"\x10": Keys.ControlP, # Control-P (16) (history back) + b"\x11": Keys.ControlQ, # Control-Q + b"\x12": Keys.ControlR, # Control-R (18) (reverse search) + b"\x13": Keys.ControlS, # Control-S (19) (forward search) + b"\x14": Keys.ControlT, # Control-T + b"\x15": Keys.ControlU, # Control-U + b"\x16": Keys.ControlV, # Control-V + b"\x17": Keys.ControlW, # Control-W + b"\x18": Keys.ControlX, # Control-X + b"\x19": Keys.ControlY, # Control-Y (25) + b"\x1a": Keys.ControlZ, # Control-Z + b"\x1c": Keys.ControlBackslash, # Both Control-\ and Ctrl-| + b"\x1d": Keys.ControlSquareClose, # Control-] + b"\x1e": Keys.ControlCircumflex, # Control-^ + b"\x1f": Keys.ControlUnderscore, # Control-underscore (Also for Ctrl-hyphen.) + b"\x7f": Keys.Backspace, # (127) Backspace (ASCII Delete.) + } + + # Keys that don't carry character data. + keycodes = { + # Home/End + 33: Keys.PageUp, + 34: Keys.PageDown, + 35: Keys.End, + 36: Keys.Home, + # Arrows + 37: Keys.Left, + 38: Keys.Up, + 39: Keys.Right, + 40: Keys.Down, + 45: Keys.Insert, + 46: Keys.Delete, + # F-keys. + 112: Keys.F1, + 113: Keys.F2, + 114: Keys.F3, + 115: Keys.F4, + 116: Keys.F5, + 117: Keys.F6, + 118: Keys.F7, + 119: Keys.F8, + 120: Keys.F9, + 121: Keys.F10, + 122: Keys.F11, + 123: Keys.F12, + } + + LEFT_ALT_PRESSED = 0x0002 + RIGHT_ALT_PRESSED = 0x0001 + SHIFT_PRESSED = 0x0010 + LEFT_CTRL_PRESSED = 0x0008 + RIGHT_CTRL_PRESSED = 0x0004 + + def __init__(self, recognize_paste: bool = True) -> None: + self._fdcon = None + self.recognize_paste = recognize_paste + + # When stdin is a tty, use that handle, otherwise, create a handle from + # CONIN$. + self.handle: HANDLE + if sys.stdin.isatty(): + self.handle = HANDLE(windll.kernel32.GetStdHandle(STD_INPUT_HANDLE)) + else: + self._fdcon = os.open("CONIN$", os.O_RDWR | os.O_BINARY) + self.handle = HANDLE(msvcrt.get_osfhandle(self._fdcon)) + + def close(self) -> None: + "Close fdcon." + if self._fdcon is not None: + os.close(self._fdcon) + + def read(self) -> Iterable[KeyPress]: + """ + Return a list of `KeyPress` instances. It won't return anything when + there was nothing to read. (This function doesn't block.) + + http://msdn.microsoft.com/en-us/library/windows/desktop/ms684961(v=vs.85).aspx + """ + max_count = 2048 # Max events to read at the same time. + + read = DWORD(0) + arrtype = INPUT_RECORD * max_count + input_records = arrtype() + + # Check whether there is some input to read. `ReadConsoleInputW` would + # block otherwise. + # (Actually, the event loop is responsible to make sure that this + # function is only called when there is something to read, but for some + # reason this happened in the asyncio_win32 loop, and it's better to be + # safe anyway.) + if not wait_for_handles([self.handle], timeout=0): + return + + # Get next batch of input event. + windll.kernel32.ReadConsoleInputW( + self.handle, pointer(input_records), max_count, pointer(read) + ) + + # First, get all the keys from the input buffer, in order to determine + # whether we should consider this a paste event or not. + all_keys = list(self._get_keys(read, input_records)) + + # Fill in 'data' for key presses. + all_keys = [self._insert_key_data(key) for key in all_keys] + + # Correct non-bmp characters that are passed as separate surrogate codes + all_keys = list(self._merge_paired_surrogates(all_keys)) + + if self.recognize_paste and self._is_paste(all_keys): + gen = iter(all_keys) + k: Optional[KeyPress] + + for k in gen: + # Pasting: if the current key consists of text or \n, turn it + # into a BracketedPaste. + data = [] + while k and ( + not isinstance(k.key, Keys) + or k.key in {Keys.ControlJ, Keys.ControlM} + ): + data.append(k.data) + try: + k = next(gen) + except StopIteration: + k = None + + if data: + yield KeyPress(Keys.BracketedPaste, "".join(data)) + if k is not None: + yield k + else: + yield from all_keys + + def _insert_key_data(self, key_press: KeyPress) -> KeyPress: + """ + Insert KeyPress data, for vt100 compatibility. + """ + if key_press.data: + return key_press + + if isinstance(key_press.key, Keys): + data = REVERSE_ANSI_SEQUENCES.get(key_press.key, "") + else: + data = "" + + return KeyPress(key_press.key, data) + + def _get_keys( + self, read: DWORD, input_records: "Array[INPUT_RECORD]" + ) -> Iterator[KeyPress]: + """ + Generator that yields `KeyPress` objects from the input records. + """ + for i in range(read.value): + ir = input_records[i] + + # Get the right EventType from the EVENT_RECORD. + # (For some reason the Windows console application 'cmder' + # [http://gooseberrycreative.com/cmder/] can return '0' for + # ir.EventType. -- Just ignore that.) + if ir.EventType in EventTypes: + ev = getattr(ir.Event, EventTypes[ir.EventType]) + + # Process if this is a key event. (We also have mouse, menu and + # focus events.) + if type(ev) == KEY_EVENT_RECORD and ev.KeyDown: + yield from self._event_to_key_presses(ev) + + elif type(ev) == MOUSE_EVENT_RECORD: + yield from self._handle_mouse(ev) + + @staticmethod + def _merge_paired_surrogates(key_presses: List[KeyPress]) -> Iterator[KeyPress]: + """ + Combines consecutive KeyPresses with high and low surrogates into + single characters + """ + buffered_high_surrogate = None + for key in key_presses: + is_text = not isinstance(key.key, Keys) + is_high_surrogate = is_text and "\uD800" <= key.key <= "\uDBFF" + is_low_surrogate = is_text and "\uDC00" <= key.key <= "\uDFFF" + + if buffered_high_surrogate: + if is_low_surrogate: + # convert high surrogate + low surrogate to single character + fullchar = ( + (buffered_high_surrogate.key + key.key) + .encode("utf-16-le", "surrogatepass") + .decode("utf-16-le") + ) + key = KeyPress(fullchar, fullchar) + else: + yield buffered_high_surrogate + buffered_high_surrogate = None + + if is_high_surrogate: + buffered_high_surrogate = key + else: + yield key + + if buffered_high_surrogate: + yield buffered_high_surrogate + + @staticmethod + def _is_paste(keys: List[KeyPress]) -> bool: + """ + Return `True` when we should consider this list of keys as a paste + event. Pasted text on windows will be turned into a + `Keys.BracketedPaste` event. (It's not 100% correct, but it is probably + the best possible way to detect pasting of text and handle that + correctly.) + """ + # Consider paste when it contains at least one newline and at least one + # other character. + text_count = 0 + newline_count = 0 + + for k in keys: + if not isinstance(k.key, Keys): + text_count += 1 + if k.key == Keys.ControlM: + newline_count += 1 + + return newline_count >= 1 and text_count >= 1 + + def _event_to_key_presses(self, ev: KEY_EVENT_RECORD) -> List[KeyPress]: + """ + For this `KEY_EVENT_RECORD`, return a list of `KeyPress` instances. + """ + assert type(ev) == KEY_EVENT_RECORD and ev.KeyDown + + result: Optional[KeyPress] = None + + control_key_state = ev.ControlKeyState + u_char = ev.uChar.UnicodeChar + # Use surrogatepass because u_char may be an unmatched surrogate + ascii_char = u_char.encode("utf-8", "surrogatepass") + + # NOTE: We don't use `ev.uChar.AsciiChar`. That appears to be the + # unicode code point truncated to 1 byte. See also: + # https://github.com/ipython/ipython/issues/10004 + # https://github.com/jonathanslenders/python-prompt-toolkit/issues/389 + + if u_char == "\x00": + if ev.VirtualKeyCode in self.keycodes: + result = KeyPress(self.keycodes[ev.VirtualKeyCode], "") + else: + if ascii_char in self.mappings: + if self.mappings[ascii_char] == Keys.ControlJ: + u_char = ( + "\n" # Windows sends \n, turn into \r for unix compatibility. + ) + result = KeyPress(self.mappings[ascii_char], u_char) + else: + result = KeyPress(u_char, u_char) + + # First we handle Shift-Control-Arrow/Home/End (need to do this first) + if ( + ( + control_key_state & self.LEFT_CTRL_PRESSED + or control_key_state & self.RIGHT_CTRL_PRESSED + ) + and control_key_state & self.SHIFT_PRESSED + and result + ): + mapping: Dict[str, str] = { + Keys.Left: Keys.ControlShiftLeft, + Keys.Right: Keys.ControlShiftRight, + Keys.Up: Keys.ControlShiftUp, + Keys.Down: Keys.ControlShiftDown, + Keys.Home: Keys.ControlShiftHome, + Keys.End: Keys.ControlShiftEnd, + Keys.Insert: Keys.ControlShiftInsert, + Keys.PageUp: Keys.ControlShiftPageUp, + Keys.PageDown: Keys.ControlShiftPageDown, + } + result.key = mapping.get(result.key, result.key) + + # Correctly handle Control-Arrow/Home/End and Control-Insert/Delete keys. + if ( + control_key_state & self.LEFT_CTRL_PRESSED + or control_key_state & self.RIGHT_CTRL_PRESSED + ) and result: + mapping = { + Keys.Left: Keys.ControlLeft, + Keys.Right: Keys.ControlRight, + Keys.Up: Keys.ControlUp, + Keys.Down: Keys.ControlDown, + Keys.Home: Keys.ControlHome, + Keys.End: Keys.ControlEnd, + Keys.Insert: Keys.ControlInsert, + Keys.Delete: Keys.ControlDelete, + Keys.PageUp: Keys.ControlPageUp, + Keys.PageDown: Keys.ControlPageDown, + } + result.key = mapping.get(result.key, result.key) + + # Turn 'Tab' into 'BackTab' when shift was pressed. + # Also handle other shift-key combination + if control_key_state & self.SHIFT_PRESSED and result: + mapping = { + Keys.Tab: Keys.BackTab, + Keys.Left: Keys.ShiftLeft, + Keys.Right: Keys.ShiftRight, + Keys.Up: Keys.ShiftUp, + Keys.Down: Keys.ShiftDown, + Keys.Home: Keys.ShiftHome, + Keys.End: Keys.ShiftEnd, + Keys.Insert: Keys.ShiftInsert, + Keys.Delete: Keys.ShiftDelete, + Keys.PageUp: Keys.ShiftPageUp, + Keys.PageDown: Keys.ShiftPageDown, + } + result.key = mapping.get(result.key, result.key) + + # Turn 'Space' into 'ControlSpace' when control was pressed. + if ( + ( + control_key_state & self.LEFT_CTRL_PRESSED + or control_key_state & self.RIGHT_CTRL_PRESSED + ) + and result + and result.data == " " + ): + result = KeyPress(Keys.ControlSpace, " ") + + # Turn Control-Enter into META-Enter. (On a vt100 terminal, we cannot + # detect this combination. But it's really practical on Windows.) + if ( + ( + control_key_state & self.LEFT_CTRL_PRESSED + or control_key_state & self.RIGHT_CTRL_PRESSED + ) + and result + and result.key == Keys.ControlJ + ): + return [KeyPress(Keys.Escape, ""), result] + + # Return result. If alt was pressed, prefix the result with an + # 'Escape' key, just like unix VT100 terminals do. + + # NOTE: Only replace the left alt with escape. The right alt key often + # acts as altgr and is used in many non US keyboard layouts for + # typing some special characters, like a backslash. We don't want + # all backslashes to be prefixed with escape. (Esc-\ has a + # meaning in E-macs, for instance.) + if result: + meta_pressed = control_key_state & self.LEFT_ALT_PRESSED + + if meta_pressed: + return [KeyPress(Keys.Escape, ""), result] + else: + return [result] + + else: + return [] + + def _handle_mouse(self, ev: MOUSE_EVENT_RECORD) -> List[KeyPress]: + """ + Handle mouse events. Return a list of KeyPress instances. + """ + event_flags = ev.EventFlags + button_state = ev.ButtonState + + event_type: Optional[MouseEventType] = None + button: MouseButton = MouseButton.NONE + + # Scroll events. + if event_flags & MOUSE_WHEELED: + if button_state > 0: + event_type = MouseEventType.SCROLL_UP + else: + event_type = MouseEventType.SCROLL_DOWN + else: + # Handle button state for non-scroll events. + if button_state == FROM_LEFT_1ST_BUTTON_PRESSED: + button = MouseButton.LEFT + + elif button_state == RIGHTMOST_BUTTON_PRESSED: + button = MouseButton.RIGHT + + # Move events. + if event_flags & MOUSE_MOVED: + event_type = MouseEventType.MOUSE_MOVE + + # No key pressed anymore: mouse up. + if event_type is None: + if button_state > 0: + # Some button pressed. + event_type = MouseEventType.MOUSE_DOWN + else: + # No button pressed. + event_type = MouseEventType.MOUSE_UP + + data = ";".join( + [ + button.value, + event_type.value, + str(ev.MousePosition.X), + str(ev.MousePosition.Y), + ] + ) + return [KeyPress(Keys.WindowsMouseEvent, data)] + + +class _Win32Handles: + """ + Utility to keep track of which handles are connectod to which callbacks. + + `add_win32_handle` starts a tiny event loop in another thread which waits + for the Win32 handle to become ready. When this happens, the callback will + be called in the current asyncio event loop using `call_soon_threadsafe`. + + `remove_win32_handle` will stop this tiny event loop. + + NOTE: We use this technique, so that we don't have to use the + `ProactorEventLoop` on Windows and we can wait for things like stdin + in a `SelectorEventLoop`. This is important, because our inputhook + mechanism (used by IPython), only works with the `SelectorEventLoop`. + """ + + def __init__(self) -> None: + self._handle_callbacks: Dict[int, Callable[[], None]] = {} + + # Windows Events that are triggered when we have to stop watching this + # handle. + self._remove_events: Dict[int, HANDLE] = {} + + def add_win32_handle(self, handle: HANDLE, callback: Callable[[], None]) -> None: + """ + Add a Win32 handle to the event loop. + """ + handle_value = handle.value + + if handle_value is None: + raise ValueError("Invalid handle.") + + # Make sure to remove a previous registered handler first. + self.remove_win32_handle(handle) + + loop = get_event_loop() + self._handle_callbacks[handle_value] = callback + + # Create remove event. + remove_event = create_win32_event() + self._remove_events[handle_value] = remove_event + + # Add reader. + def ready() -> None: + # Tell the callback that input's ready. + try: + callback() + finally: + run_in_executor_with_context(wait, loop=loop) + + # Wait for the input to become ready. + # (Use an executor for this, the Windows asyncio event loop doesn't + # allow us to wait for handles like stdin.) + def wait() -> None: + # Wait until either the handle becomes ready, or the remove event + # has been set. + result = wait_for_handles([remove_event, handle]) + + if result is remove_event: + windll.kernel32.CloseHandle(remove_event) + return + else: + loop.call_soon_threadsafe(ready) + + run_in_executor_with_context(wait, loop=loop) + + def remove_win32_handle(self, handle: HANDLE) -> Optional[Callable[[], None]]: + """ + Remove a Win32 handle from the event loop. + Return either the registered handler or `None`. + """ + if handle.value is None: + return None # Ignore. + + # Trigger remove events, so that the reader knows to stop. + try: + event = self._remove_events.pop(handle.value) + except KeyError: + pass + else: + windll.kernel32.SetEvent(event) + + try: + return self._handle_callbacks.pop(handle.value) + except KeyError: + return None + + +@contextmanager +def attach_win32_input( + input: _Win32InputBase, callback: Callable[[], None] +) -> Iterator[None]: + """ + Context manager that makes this input active in the current event loop. + + :param input: :class:`~prompt_toolkit.input.Input` object. + :param input_ready_callback: Called when the input is ready to read. + """ + win32_handles = input.win32_handles + handle = input.handle + + if handle.value is None: + raise ValueError("Invalid handle.") + + # Add reader. + previous_callback = win32_handles.remove_win32_handle(handle) + win32_handles.add_win32_handle(handle, callback) + + try: + yield + finally: + win32_handles.remove_win32_handle(handle) + + if previous_callback: + win32_handles.add_win32_handle(handle, previous_callback) + + +@contextmanager +def detach_win32_input(input: _Win32InputBase) -> Iterator[None]: + win32_handles = input.win32_handles + handle = input.handle + + if handle.value is None: + raise ValueError("Invalid handle.") + + previous_callback = win32_handles.remove_win32_handle(handle) + + try: + yield + finally: + if previous_callback: + win32_handles.add_win32_handle(handle, previous_callback) + + +class raw_mode: + """ + :: + + with raw_mode(stdin): + ''' the windows terminal is now in 'raw' mode. ''' + + The ``fileno`` attribute is ignored. This is to be compatible with the + `raw_input` method of `.vt100_input`. + """ + + def __init__(self, fileno: Optional[int] = None) -> None: + self.handle = HANDLE(windll.kernel32.GetStdHandle(STD_INPUT_HANDLE)) + + def __enter__(self) -> None: + # Remember original mode. + original_mode = DWORD() + windll.kernel32.GetConsoleMode(self.handle, pointer(original_mode)) + self.original_mode = original_mode + + self._patch() + + def _patch(self) -> None: + # Set raw + ENABLE_ECHO_INPUT = 0x0004 + ENABLE_LINE_INPUT = 0x0002 + ENABLE_PROCESSED_INPUT = 0x0001 + + windll.kernel32.SetConsoleMode( + self.handle, + self.original_mode.value + & ~(ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT | ENABLE_PROCESSED_INPUT), + ) + + def __exit__(self, *a: object) -> None: + # Restore original mode + windll.kernel32.SetConsoleMode(self.handle, self.original_mode) + + +class cooked_mode(raw_mode): + """ + :: + + with cooked_mode(stdin): + ''' The pseudo-terminal stdin is now used in cooked mode. ''' + """ + + def _patch(self) -> None: + # Set cooked. + ENABLE_ECHO_INPUT = 0x0004 + ENABLE_LINE_INPUT = 0x0002 + ENABLE_PROCESSED_INPUT = 0x0001 + + windll.kernel32.SetConsoleMode( + self.handle, + self.original_mode.value + | (ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT | ENABLE_PROCESSED_INPUT), + ) |