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# ========================================================================== #
# #
# KVMD - The main Pi-KVM daemon. #
# #
# Copyright (C) 2020 Maxim Devaev <[email protected]> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU 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 General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
# #
# ========================================================================== #
import dataclasses
import pkgutil
import functools
from typing import Dict
import Xlib.keysymdef
from ..logging import get_logger
from .mappings import At1Key
from .mappings import X11_TO_AT1
from .mappings import AT1_TO_WEB
# =====
@dataclasses.dataclass(frozen=True)
class SymmapWebKey:
name: str
shift: bool
altgr: bool
ctrl: bool
def build_symmap(path: str) -> Dict[int, SymmapWebKey]:
# https://github.com/qemu/qemu/blob/95a9457fd44ad97c518858a4e1586a5498f9773c/ui/keymaps.c
logger = get_logger()
symmap: Dict[int, SymmapWebKey] = {}
for (src, items) in [
("<builtin>", list(X11_TO_AT1.items())),
(path, list(_read_keyboard_layout(path).items())),
]:
for (code, key) in items:
web_name = AT1_TO_WEB.get(key.code)
if web_name is not None:
if (
(web_name in ["ShiftLeft", "ShiftRight"] and key.shift) # pylint: disable=too-many-boolean-expressions
or (web_name in ["AltLeft", "AltRight"] and key.altgr)
or (web_name in ["ControlLeft", "ControlRight"] and key.ctrl)
):
logger.error("Invalid modifier key at mapping %s: %s / %s", src, web_name, key)
continue
symmap[code] = SymmapWebKey(
name=web_name,
shift=key.shift,
altgr=key.altgr,
ctrl=key.ctrl,
)
return symmap
# =====
@functools.lru_cache()
def _get_keysyms() -> Dict[str, int]:
keysyms: Dict[str, int] = {}
for (loader, module_name, _) in pkgutil.walk_packages(Xlib.keysymdef.__path__):
module = loader.find_module(module_name).load_module(module_name)
for keysym_name in dir(module):
if keysym_name.startswith("XK_"):
short_name = keysym_name[3:]
if short_name.startswith("XF86_"):
short_name = "XF86" + short_name[5:]
# assert short_name not in keysyms, short_name
keysyms[short_name] = int(getattr(module, keysym_name))
return keysyms
def _resolve_keysym(name: str) -> int:
code = _get_keysyms().get(name)
if code is not None:
return code
if len(name) == 5 and name[0] == "U": # Try unicode Uxxxx
try:
return int(name[1:], 16)
except ValueError:
pass
return 0
def _read_keyboard_layout(path: str) -> Dict[int, At1Key]: # Keysym to evdev (at1)
logger = get_logger(0)
logger.info("Reading keyboard layout %s ...", path)
with open(path) as layout_file:
lines = list(map(str.strip, layout_file.read().split("\n")))
layout: Dict[int, At1Key] = {}
for (lineno, line) in enumerate(lines):
if len(line) == 0 or line.startswith(("#", "map ", "include ")):
continue
parts = line.split()
if len(parts) >= 2:
x11_code = _resolve_keysym(parts[0])
if x11_code != 0:
try:
at1_code = int(parts[1], 16)
except ValueError as err:
logger.error("Syntax error at %s:%d: %s", path, lineno, err)
continue
rest = parts[2:]
layout[x11_code] = At1Key(
code=at1_code,
shift=("shift" in rest),
altgr=("altgr" in rest),
ctrl=("ctrl" in rest),
)
if "addupper" in rest:
x11_code = _resolve_keysym(parts[0].upper())
if x11_code != 0:
layout[x11_code] = At1Key(
code=at1_code,
shift=True,
)
return layout
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