655 lines
22 KiB
Python
655 lines
22 KiB
Python
import msvcrt
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import os
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import sys
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from abc import abstractmethod
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from asyncio import get_event_loop
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from contextlib import contextmanager
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from ctypes import pointer, windll
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from ctypes.wintypes import DWORD, HANDLE
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from typing import Callable, ContextManager, Dict, Iterable, List, Optional, TextIO
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from prompt_toolkit.eventloop import run_in_executor_with_context
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from prompt_toolkit.eventloop.win32 import create_win32_event, wait_for_handles
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from prompt_toolkit.key_binding.key_processor import KeyPress
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from prompt_toolkit.keys import Keys
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from prompt_toolkit.mouse_events import MouseEventType
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from prompt_toolkit.win32_types import (
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INPUT_RECORD,
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KEY_EVENT_RECORD,
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MOUSE_EVENT_RECORD,
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STD_INPUT_HANDLE,
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EventTypes,
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)
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from .ansi_escape_sequences import REVERSE_ANSI_SEQUENCES
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from .base import Input
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__all__ = [
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"Win32Input",
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"ConsoleInputReader",
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"raw_mode",
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"cooked_mode",
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"attach_win32_input",
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"detach_win32_input",
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]
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class _Win32InputBase(Input):
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"""
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Base class for `Win32Input` and `Win32PipeInput`.
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"""
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def __init__(self) -> None:
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self.win32_handles = _Win32Handles()
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@property
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@abstractmethod
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def handle(self) -> HANDLE:
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pass
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class Win32Input(_Win32InputBase):
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"""
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`Input` class that reads from the Windows console.
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"""
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def __init__(self, stdin: Optional[TextIO] = None) -> None:
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super().__init__()
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self.console_input_reader = ConsoleInputReader()
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def attach(self, input_ready_callback: Callable[[], None]) -> ContextManager[None]:
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"""
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Return a context manager that makes this input active in the current
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event loop.
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"""
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return attach_win32_input(self, input_ready_callback)
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def detach(self) -> ContextManager[None]:
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"""
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Return a context manager that makes sure that this input is not active
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in the current event loop.
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"""
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return detach_win32_input(self)
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def read_keys(self) -> List[KeyPress]:
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return list(self.console_input_reader.read())
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def flush(self) -> None:
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pass
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@property
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def closed(self) -> bool:
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return False
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def raw_mode(self) -> ContextManager[None]:
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return raw_mode()
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def cooked_mode(self) -> ContextManager[None]:
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return cooked_mode()
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def fileno(self) -> int:
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# The windows console doesn't depend on the file handle, so
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# this is not used for the event loop (which uses the
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# handle instead). But it's used in `Application.run_system_command`
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# which opens a subprocess with a given stdin/stdout.
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return sys.stdin.fileno()
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def typeahead_hash(self) -> str:
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return "win32-input"
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def close(self) -> None:
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self.console_input_reader.close()
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@property
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def handle(self) -> HANDLE:
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return self.console_input_reader.handle
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class ConsoleInputReader:
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"""
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:param recognize_paste: When True, try to discover paste actions and turn
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the event into a BracketedPaste.
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"""
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# Keys with character data.
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mappings = {
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b"\x1b": Keys.Escape,
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b"\x00": Keys.ControlSpace, # Control-Space (Also for Ctrl-@)
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b"\x01": Keys.ControlA, # Control-A (home)
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b"\x02": Keys.ControlB, # Control-B (emacs cursor left)
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b"\x03": Keys.ControlC, # Control-C (interrupt)
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b"\x04": Keys.ControlD, # Control-D (exit)
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b"\x05": Keys.ControlE, # Control-E (end)
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b"\x06": Keys.ControlF, # Control-F (cursor forward)
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b"\x07": Keys.ControlG, # Control-G
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b"\x08": Keys.ControlH, # Control-H (8) (Identical to '\b')
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b"\x09": Keys.ControlI, # Control-I (9) (Identical to '\t')
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b"\x0a": Keys.ControlJ, # Control-J (10) (Identical to '\n')
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b"\x0b": Keys.ControlK, # Control-K (delete until end of line; vertical tab)
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b"\x0c": Keys.ControlL, # Control-L (clear; form feed)
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b"\x0d": Keys.ControlM, # Control-M (enter)
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b"\x0e": Keys.ControlN, # Control-N (14) (history forward)
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b"\x0f": Keys.ControlO, # Control-O (15)
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b"\x10": Keys.ControlP, # Control-P (16) (history back)
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b"\x11": Keys.ControlQ, # Control-Q
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b"\x12": Keys.ControlR, # Control-R (18) (reverse search)
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b"\x13": Keys.ControlS, # Control-S (19) (forward search)
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b"\x14": Keys.ControlT, # Control-T
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b"\x15": Keys.ControlU, # Control-U
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b"\x16": Keys.ControlV, # Control-V
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b"\x17": Keys.ControlW, # Control-W
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b"\x18": Keys.ControlX, # Control-X
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b"\x19": Keys.ControlY, # Control-Y (25)
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b"\x1a": Keys.ControlZ, # Control-Z
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b"\x1c": Keys.ControlBackslash, # Both Control-\ and Ctrl-|
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b"\x1d": Keys.ControlSquareClose, # Control-]
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b"\x1e": Keys.ControlCircumflex, # Control-^
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b"\x1f": Keys.ControlUnderscore, # Control-underscore (Also for Ctrl-hyphen.)
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b"\x7f": Keys.Backspace, # (127) Backspace (ASCII Delete.)
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}
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# Keys that don't carry character data.
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keycodes = {
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# Home/End
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33: Keys.PageUp,
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34: Keys.PageDown,
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35: Keys.End,
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36: Keys.Home,
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# Arrows
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37: Keys.Left,
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38: Keys.Up,
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39: Keys.Right,
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40: Keys.Down,
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45: Keys.Insert,
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46: Keys.Delete,
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# F-keys.
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112: Keys.F1,
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113: Keys.F2,
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114: Keys.F3,
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115: Keys.F4,
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116: Keys.F5,
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117: Keys.F6,
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118: Keys.F7,
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119: Keys.F8,
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120: Keys.F9,
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121: Keys.F10,
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122: Keys.F11,
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123: Keys.F12,
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}
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LEFT_ALT_PRESSED = 0x0002
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RIGHT_ALT_PRESSED = 0x0001
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SHIFT_PRESSED = 0x0010
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LEFT_CTRL_PRESSED = 0x0008
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RIGHT_CTRL_PRESSED = 0x0004
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def __init__(self, recognize_paste: bool = True) -> None:
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self._fdcon = None
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self.recognize_paste = recognize_paste
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# When stdin is a tty, use that handle, otherwise, create a handle from
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# CONIN$.
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self.handle: HANDLE
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if sys.stdin.isatty():
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self.handle = HANDLE(windll.kernel32.GetStdHandle(STD_INPUT_HANDLE))
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else:
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self._fdcon = os.open("CONIN$", os.O_RDWR | os.O_BINARY)
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self.handle = HANDLE(msvcrt.get_osfhandle(self._fdcon))
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def close(self) -> None:
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" Close fdcon. "
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if self._fdcon is not None:
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os.close(self._fdcon)
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def read(self) -> Iterable[KeyPress]:
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"""
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Return a list of `KeyPress` instances. It won't return anything when
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there was nothing to read. (This function doesn't block.)
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http://msdn.microsoft.com/en-us/library/windows/desktop/ms684961(v=vs.85).aspx
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"""
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max_count = 2048 # Max events to read at the same time.
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read = DWORD(0)
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arrtype = INPUT_RECORD * max_count
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input_records = arrtype()
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# Check whether there is some input to read. `ReadConsoleInputW` would
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# block otherwise.
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# (Actually, the event loop is responsible to make sure that this
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# function is only called when there is something to read, but for some
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# reason this happened in the asyncio_win32 loop, and it's better to be
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# safe anyway.)
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if not wait_for_handles([self.handle], timeout=0):
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return
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# Get next batch of input event.
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windll.kernel32.ReadConsoleInputW(
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self.handle, pointer(input_records), max_count, pointer(read)
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)
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# First, get all the keys from the input buffer, in order to determine
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# whether we should consider this a paste event or not.
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all_keys = list(self._get_keys(read, input_records))
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# Fill in 'data' for key presses.
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all_keys = [self._insert_key_data(key) for key in all_keys]
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if self.recognize_paste and self._is_paste(all_keys):
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gen = iter(all_keys)
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k: Optional[KeyPress]
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for k in gen:
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# Pasting: if the current key consists of text or \n, turn it
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# into a BracketedPaste.
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data = []
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while k and (isinstance(k.key, str) or k.key == Keys.ControlJ):
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data.append(k.data)
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try:
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k = next(gen)
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except StopIteration:
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k = None
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if data:
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yield KeyPress(Keys.BracketedPaste, "".join(data))
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if k is not None:
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yield k
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else:
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for k2 in all_keys:
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yield k2
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def _insert_key_data(self, key_press: KeyPress) -> KeyPress:
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"""
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Insert KeyPress data, for vt100 compatibility.
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"""
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if key_press.data:
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return key_press
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if isinstance(key_press.key, Keys):
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data = REVERSE_ANSI_SEQUENCES.get(key_press.key, "")
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else:
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data = ""
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return KeyPress(key_press.key, data)
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def _get_keys(self, read, input_records):
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"""
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Generator that yields `KeyPress` objects from the input records.
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"""
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for i in range(read.value):
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ir = input_records[i]
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# Get the right EventType from the EVENT_RECORD.
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# (For some reason the Windows console application 'cmder'
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# [http://gooseberrycreative.com/cmder/] can return '0' for
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# ir.EventType. -- Just ignore that.)
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if ir.EventType in EventTypes:
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ev = getattr(ir.Event, EventTypes[ir.EventType])
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# Process if this is a key event. (We also have mouse, menu and
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# focus events.)
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if type(ev) == KEY_EVENT_RECORD and ev.KeyDown:
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for key_press in self._event_to_key_presses(ev):
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yield key_press
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elif type(ev) == MOUSE_EVENT_RECORD:
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for key_press in self._handle_mouse(ev):
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yield key_press
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@staticmethod
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def _is_paste(keys) -> bool:
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"""
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Return `True` when we should consider this list of keys as a paste
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event. Pasted text on windows will be turned into a
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`Keys.BracketedPaste` event. (It's not 100% correct, but it is probably
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the best possible way to detect pasting of text and handle that
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correctly.)
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"""
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# Consider paste when it contains at least one newline and at least one
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# other character.
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text_count = 0
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newline_count = 0
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for k in keys:
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if isinstance(k.key, str):
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text_count += 1
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if k.key == Keys.ControlM:
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newline_count += 1
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return newline_count >= 1 and text_count > 1
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def _event_to_key_presses(self, ev):
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"""
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For this `KEY_EVENT_RECORD`, return a list of `KeyPress` instances.
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"""
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assert type(ev) == KEY_EVENT_RECORD and ev.KeyDown
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result = None
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u_char = ev.uChar.UnicodeChar
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ascii_char = u_char.encode("utf-8")
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# NOTE: We don't use `ev.uChar.AsciiChar`. That appears to be latin-1
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# encoded. See also:
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# https://github.com/ipython/ipython/issues/10004
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# https://github.com/jonathanslenders/python-prompt-toolkit/issues/389
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if u_char == "\x00":
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if ev.VirtualKeyCode in self.keycodes:
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result = KeyPress(self.keycodes[ev.VirtualKeyCode], "")
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else:
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if ascii_char in self.mappings:
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if self.mappings[ascii_char] == Keys.ControlJ:
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u_char = (
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"\n" # Windows sends \n, turn into \r for unix compatibility.
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)
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result = KeyPress(self.mappings[ascii_char], u_char)
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else:
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result = KeyPress(u_char, u_char)
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# First we handle Shift-Control-Arrow/Home/End (need to do this first)
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if (
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(
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ev.ControlKeyState & self.LEFT_CTRL_PRESSED
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or ev.ControlKeyState & self.RIGHT_CTRL_PRESSED
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)
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and ev.ControlKeyState & self.SHIFT_PRESSED
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and result
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):
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result.key = {
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Keys.Left: Keys.ControlShiftLeft,
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Keys.Right: Keys.ControlShiftRight,
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Keys.Up: Keys.ControlShiftUp,
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Keys.Down: Keys.ControlShiftDown,
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Keys.Home: Keys.ControlShiftHome,
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Keys.End: Keys.ControlShiftEnd,
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Keys.Insert: Keys.ControlShiftInsert,
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Keys.PageUp: Keys.ControlShiftPageUp,
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Keys.PageDown: Keys.ControlShiftPageDown,
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}.get(result.key, result.key)
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# Correctly handle Control-Arrow/Home/End and Control-Insert keys.
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if (
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ev.ControlKeyState & self.LEFT_CTRL_PRESSED
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or ev.ControlKeyState & self.RIGHT_CTRL_PRESSED
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) and result:
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result.key = {
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Keys.Left: Keys.ControlLeft,
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Keys.Right: Keys.ControlRight,
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Keys.Up: Keys.ControlUp,
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Keys.Down: Keys.ControlDown,
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Keys.Home: Keys.ControlHome,
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Keys.End: Keys.ControlEnd,
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Keys.Insert: Keys.ControlInsert,
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Keys.PageUp: Keys.ControlPageUp,
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Keys.PageDown: Keys.ControlPageDown,
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}.get(result.key, result.key)
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# Turn 'Tab' into 'BackTab' when shift was pressed.
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# Also handle other shift-key combination
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if ev.ControlKeyState & self.SHIFT_PRESSED and result:
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result.key = {
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Keys.Tab: Keys.BackTab,
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Keys.Left: Keys.ShiftLeft,
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Keys.Right: Keys.ShiftRight,
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Keys.Up: Keys.ShiftUp,
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Keys.Down: Keys.ShiftDown,
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Keys.Home: Keys.ShiftHome,
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Keys.End: Keys.ShiftEnd,
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Keys.Insert: Keys.ShiftInsert,
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Keys.PageUp: Keys.ShiftPageUp,
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Keys.PageDown: Keys.ShiftPageDown,
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}.get(result.key, result.key)
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# Turn 'Space' into 'ControlSpace' when control was pressed.
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if (
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(
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ev.ControlKeyState & self.LEFT_CTRL_PRESSED
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or ev.ControlKeyState & self.RIGHT_CTRL_PRESSED
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)
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and result
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and result.data == " "
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):
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result = KeyPress(Keys.ControlSpace, " ")
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# Turn Control-Enter into META-Enter. (On a vt100 terminal, we cannot
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# detect this combination. But it's really practical on Windows.)
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if (
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(
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ev.ControlKeyState & self.LEFT_CTRL_PRESSED
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or ev.ControlKeyState & self.RIGHT_CTRL_PRESSED
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)
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and result
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and result.key == Keys.ControlJ
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):
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return [KeyPress(Keys.Escape, ""), result]
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# Return result. If alt was pressed, prefix the result with an
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# 'Escape' key, just like unix VT100 terminals do.
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# NOTE: Only replace the left alt with escape. The right alt key often
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# acts as altgr and is used in many non US keyboard layouts for
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# typing some special characters, like a backslash. We don't want
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# all backslashes to be prefixed with escape. (Esc-\ has a
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# meaning in E-macs, for instance.)
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if result:
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meta_pressed = ev.ControlKeyState & self.LEFT_ALT_PRESSED
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if meta_pressed:
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return [KeyPress(Keys.Escape, ""), result]
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else:
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return [result]
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else:
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return []
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def _handle_mouse(self, ev):
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"""
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Handle mouse events. Return a list of KeyPress instances.
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"""
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FROM_LEFT_1ST_BUTTON_PRESSED = 0x1
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result = []
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# Check event type.
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if ev.ButtonState == FROM_LEFT_1ST_BUTTON_PRESSED:
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# On a key press, generate both the mouse down and up event.
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for event_type in [MouseEventType.MOUSE_DOWN, MouseEventType.MOUSE_UP]:
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data = ";".join(
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[event_type.value, str(ev.MousePosition.X), str(ev.MousePosition.Y)]
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)
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result.append(KeyPress(Keys.WindowsMouseEvent, data))
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return result
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class _Win32Handles:
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"""
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Utility to keep track of which handles are connectod to which callbacks.
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`add_win32_handle` starts a tiny event loop in another thread which waits
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for the Win32 handle to become ready. When this happens, the callback will
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be called in the current asyncio event loop using `call_soon_threadsafe`.
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`remove_win32_handle` will stop this tiny event loop.
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NOTE: We use this technique, so that we don't have to use the
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`ProactorEventLoop` on Windows and we can wait for things like stdin
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in a `SelectorEventLoop`. This is important, because our inputhook
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mechanism (used by IPython), only works with the `SelectorEventLoop`.
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"""
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def __init__(self) -> None:
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self._handle_callbacks: Dict[int, Callable[[], None]] = {}
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# Windows Events that are triggered when we have to stop watching this
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# handle.
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self._remove_events: Dict[int, HANDLE] = {}
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def add_win32_handle(self, handle: HANDLE, callback: Callable[[], None]) -> None:
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"""
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Add a Win32 handle to the event loop.
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"""
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handle_value = handle.value
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if handle_value is None:
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raise ValueError("Invalid handle.")
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# Make sure to remove a previous registered handler first.
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self.remove_win32_handle(handle)
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loop = get_event_loop()
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self._handle_callbacks[handle_value] = callback
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# Create remove event.
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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]):
|
|
"""
|
|
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):
|
|
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=None):
|
|
self.handle = HANDLE(windll.kernel32.GetStdHandle(STD_INPUT_HANDLE))
|
|
|
|
def __enter__(self):
|
|
# 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),
|
|
)
|