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dhruv
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myenv/lib/python3.10/site-packages/pynput/_util/xorg.py Normal file
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# coding=utf-8
# pynput
# Copyright (C) 2015-2024 Moses Palmér
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Utility functions and classes for the *Xorg* backend.
"""
# pylint: disable=R0903
# We implement stubs
import contextlib
import functools
import itertools
import operator
import Xlib.display
import Xlib.keysymdef
import Xlib.threaded
import Xlib.XK
from . import AbstractListener
from .xorg_keysyms import SYMBOLS
# Create a display to verify that we have an X connection
def _check_and_initialize():
display = Xlib.display.Display()
display.close()
for group in Xlib.keysymdef.__all__:
Xlib.XK.load_keysym_group(group)
_check_and_initialize()
del _check_and_initialize
class X11Error(Exception):
"""An error that is thrown at the end of a code block managed by a
:func:`display_manager` if an *X11* error occurred.
"""
pass
@contextlib.contextmanager
def display_manager(display):
"""Traps *X* errors and raises an :class:``X11Error`` at the end if any
error occurred.
This handler also ensures that the :class:`Xlib.display.Display` being
managed is sync'd.
:param Xlib.display.Display display: The *X* display.
:return: the display
:rtype: Xlib.display.Display
"""
errors = []
def handler(*args):
"""The *Xlib* error handler.
"""
errors.append(args)
old_handler = display.set_error_handler(handler)
try:
yield display
display.sync()
finally:
display.set_error_handler(old_handler)
if errors:
raise X11Error(errors)
def _find_mask(display, symbol):
"""Returns the mode flags to use for a modifier symbol.
:param Xlib.display.Display display: The *X* display.
:param str symbol: The name of the symbol.
:return: the modifier mask
"""
# Get the key code for the symbol
modifier_keycode = display.keysym_to_keycode(
Xlib.XK.string_to_keysym(symbol))
for index, keycodes in enumerate(display.get_modifier_mapping()):
for keycode in keycodes:
if keycode == modifier_keycode:
return 1 << index
return 0
def alt_mask(display):
"""Returns the *alt* mask flags.
The first time this function is called for a display, the value is cached.
Subsequent calls will return the cached value.
:param Xlib.display.Display display: The *X* display.
:return: the modifier mask
"""
if not hasattr(display, '__alt_mask'):
display.__alt_mask = _find_mask(display, 'Alt_L')
return display.__alt_mask
def alt_gr_mask(display):
"""Returns the *alt* mask flags.
The first time this function is called for a display, the value is cached.
Subsequent calls will return the cached value.
:param Xlib.display.Display display: The *X* display.
:return: the modifier mask
"""
if not hasattr(display, '__altgr_mask'):
display.__altgr_mask = _find_mask(display, 'Mode_switch')
return display.__altgr_mask
def numlock_mask(display):
"""Returns the *numlock* mask flags.
The first time this function is called for a display, the value is cached.
Subsequent calls will return the cached value.
:param Xlib.display.Display display: The *X* display.
:return: the modifier mask
"""
if not hasattr(display, '__numlock_mask'):
display.__numlock_mask = _find_mask(display, 'Num_Lock')
return display.__numlock_mask
def keysym_is_latin_upper(keysym):
"""Determines whether a *keysym* is an upper case *latin* character.
This is true only if ``XK_A`` <= ``keysym`` <= ` XK_Z``.
:param in keysym: The *keysym* to check.
"""
return Xlib.XK.XK_A <= keysym <= Xlib.XK.XK_Z
def keysym_is_latin_lower(keysym):
"""Determines whether a *keysym* is a lower case *latin* character.
This is true only if ``XK_a`` <= ``keysym`` <= ` XK_z``.
:param in keysym: The *keysym* to check.
"""
return Xlib.XK.XK_a <= keysym <= Xlib.XK.XK_z
def keysym_group(ks1, ks2):
"""Generates a group from two *keysyms*.
The implementation of this function comes from:
Within each group, if the second element of the group is ``NoSymbol``,
then the group should be treated as if the second element were the same
as the first element, except when the first element is an alphabetic
*KeySym* ``K`` for which both lowercase and uppercase forms are
defined.
In that case, the group should be treated as if the first element were
the lowercase form of ``K`` and the second element were the uppercase
form of ``K``.
This function assumes that *alphabetic* means *latin*; this assumption
appears to be consistent with observations of the return values from
``XGetKeyboardMapping``.
:param ks1: The first *keysym*.
:param ks2: The second *keysym*.
:return: a tuple conforming to the description above
"""
if ks2 == Xlib.XK.NoSymbol:
if keysym_is_latin_upper(ks1):
return (Xlib.XK.XK_a + ks1 - Xlib.XK.XK_A, ks1)
elif keysym_is_latin_lower(ks1):
return (ks1, Xlib.XK.XK_A + ks1 - Xlib.XK.XK_a)
else:
return (ks1, ks1)
else:
return (ks1, ks2)
def keysym_normalize(keysym):
"""Normalises a list of *keysyms*.
The implementation of this function comes from:
If the list (ignoring trailing ``NoSymbol`` entries) is a single
*KeySym* ``K``, then the list is treated as if it were the list
``K NoSymbol K NoSymbol``.
If the list (ignoring trailing ``NoSymbol`` entries) is a pair of
*KeySyms* ``K1 K2``, then the list is treated as if it were the list
``K1 K2 K1 K2``.
If the list (ignoring trailing ``NoSymbol`` entries) is a triple of
*KeySyms* ``K1 K2 K3``, then the list is treated as if it were the list
``K1 K2 K3 NoSymbol``.
This function will also group the *keysyms* using :func:`keysym_group`.
:param keysyms: A list of keysyms.
:return: the tuple ``(group_1, group_2)`` or ``None``
"""
# Remove trailing NoSymbol
stripped = list(reversed(list(
itertools.dropwhile(
lambda n: n == Xlib.XK.NoSymbol,
reversed(keysym)))))
if not stripped:
return
elif len(stripped) == 1:
return (
keysym_group(stripped[0], Xlib.XK.NoSymbol),
keysym_group(stripped[0], Xlib.XK.NoSymbol))
elif len(stripped) == 2:
return (
keysym_group(stripped[0], stripped[1]),
keysym_group(stripped[0], stripped[1]))
elif len(stripped) == 3:
return (
keysym_group(stripped[0], stripped[1]),
keysym_group(stripped[2], Xlib.XK.NoSymbol))
elif len(stripped) >= 6:
# TODO: Find out why this is necessary; using only the documented
# behaviour may lead to only a US layout being used?
return (
keysym_group(stripped[0], stripped[1]),
keysym_group(stripped[4], stripped[5]))
else:
return (
keysym_group(stripped[0], stripped[1]),
keysym_group(stripped[2], stripped[3]))
def index_to_shift(display, index):
"""Converts an index in a *key code* list to the corresponding shift state.
:param Xlib.display.Display display: The display for which to retrieve the
shift mask.
:param int index: The keyboard mapping *key code* index.
:return: a shift mask
"""
return (
(1 << 0 if index & 1 else 0) |
(alt_gr_mask(display) if index & 2 else 0))
def shift_to_index(display, shift):
"""Converts an index in a *key code* list to the corresponding shift state.
:param Xlib.display.Display display: The display for which to retrieve the
shift mask.
:param int index: The keyboard mapping *key code* index.
:return: a shift mask
"""
return (
(1 if shift & 1 else 0) +
(2 if shift & alt_gr_mask(display) else 0))
def keyboard_mapping(display):
"""Generates a mapping from *keysyms* to *key codes* and required
modifier shift states.
:param Xlib.display.Display display: The display for which to retrieve the
keyboard mapping.
:return: the keyboard mapping
"""
mapping = {}
shift_mask = 1 << 0
group_mask = alt_gr_mask(display)
# Iterate over all keysym lists in the keyboard mapping
min_keycode = display.display.info.min_keycode
keycode_count = display.display.info.max_keycode - min_keycode + 1
for index, keysyms in enumerate(display.get_keyboard_mapping(
min_keycode, keycode_count)):
key_code = index + min_keycode
# Normalise the keysym list to yield a tuple containing the two groups
normalized = keysym_normalize(keysyms)
if not normalized:
continue
# Iterate over the groups to extract the shift and modifier state
for groups, group in zip(normalized, (False, True)):
for keysym, shift in zip(groups, (False, True)):
if not keysym:
continue
shift_state = 0 \
| (shift_mask if shift else 0) \
| (group_mask if group else 0)
# Prefer already known lesser shift states
if keysym in mapping and mapping[keysym][1] < shift_state:
continue
mapping[keysym] = (key_code, shift_state)
return mapping
def char_to_keysym(char):
"""Converts a unicode character to a *keysym*.
:param str char: The unicode character.
:return: the corresponding *keysym*, or ``0`` if it cannot be found
"""
ordinal = ord(char)
if ordinal < 0x100:
return ordinal
else:
return ordinal | 0x01000000
def symbol_to_keysym(symbol):
"""Converts a symbol name to a *keysym*.
:param str symbol: The name of the symbol.
:return: the corresponding *keysym*, or ``0`` if it cannot be found
"""
# First try simple translation, the try a module attribute of
# Xlib.keysymdef.xkb and fall back on our pre-generated table
return (0
or Xlib.XK.string_to_keysym(symbol)
or getattr(Xlib.keysymdef.xkb, "XK_" + symbol, 0)
or SYMBOLS.get(symbol, (0,))[0])
class ListenerMixin(object):
"""A mixin for *X* event listeners.
Subclasses should set a value for :attr:`_EVENTS` and implement
:meth:`_handle_message`.
"""
#: The events for which to listen
_EVENTS = tuple()
#: We use this instance for parsing the binary data
_EVENT_PARSER = Xlib.protocol.rq.EventField(None)
def _run(self):
self._display_stop = Xlib.display.Display()
self._display_record = Xlib.display.Display()
self._stopped = False
with display_manager(self._display_record) as dm:
self._context = dm.record_create_context(
0,
[Xlib.ext.record.AllClients],
[{
'core_requests': (0, 0),
'core_replies': (0, 0),
'ext_requests': (0, 0, 0, 0),
'ext_replies': (0, 0, 0, 0),
'delivered_events': (0, 0),
'device_events': self._EVENTS,
'errors': (0, 0),
'client_started': False,
'client_died': False}])
# pylint: disable=W0702; we want to silence errors
try:
self._initialize(self._display_stop)
self._mark_ready()
if self.suppress:
with display_manager(self._display_stop) as dm:
self._suppress_start(dm)
self._display_record.record_enable_context(
self._context, self._handler)
except:
# This exception will have been passed to the main thread
pass
finally:
if self.suppress:
with display_manager(self._display_stop) as dm:
self._suppress_stop(dm)
self._display_stop.record_disable_context(self._context)
self._display_stop.flush()
self._display_record.record_free_context(self._context)
self._display_stop.close()
self._display_record.close()
# pylint: enable=W0702
def _stop_platform(self):
if not hasattr(self, '_context'):
self.wait()
# Do this asynchronously to avoid deadlocks
self._display_record.record_disable_context(self._context)
def _suppress_start(self, display):
"""Starts suppressing events.
:param Xlib.display.Display display: The display for which to suppress
events.
"""
raise NotImplementedError()
def _suppress_stop(self, display):
"""Starts suppressing events.
:param Xlib.display.Display display: The display for which to suppress
events.
"""
raise NotImplementedError()
@property
def _event_mask(self):
"""The event mask.
"""
return functools.reduce(operator.__or__, self._EVENTS, 0)
@AbstractListener._emitter
def _handler(self, events):
"""The callback registered with *X* for mouse events.
This method will parse the response and call the callbacks registered
on initialisation.
:param events: The events passed by *X*. This is a binary block
parsable by :attr:`_EVENT_PARSER`.
"""
if not self.running:
raise self.StopException()
data = events.data
while data and len(data):
event, data = self._EVENT_PARSER.parse_binary_value(
data, self._display_record.display, None, None)
injected = event.send_event
self._handle_message(self._display_stop, event, injected)
def _initialize(self, display):
"""Initialises this listener.
This method is called immediately before the event loop, from the
handler thread.
:param display: The display being used.
"""
pass
def _handle_message(self, display, event, injected):
"""The device specific callback handler.
This method calls the appropriate callback registered when this
listener was created based on the event.
:param display: The display being used.
:param event: The event.
:param bool injected: Whether the event was injected.
"""
pass