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57 lines (48 loc) · 2.04 KB
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# MIT License
#
# Copyright (c) 2025 Guus Bertens
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
from functools import partialmethod
from typing import Optional
class FSM:
_FSM_EVENTS = []
_FSM_INITIAL_STATE = None
__state: Optional[str]
@classmethod
def __init_subclass__(cls, **kwargs):
super().__init_subclass__(**kwargs)
for event in cls._FSM_EVENTS:
fn = partialmethod(cls._fsm_event, event)
setattr(cls, f'_{event}', fn)
def __init__(self):
self.__state = self._FSM_INITIAL_STATE
self._fsm_event('enter')
super().__init__()
def _fsm_event(self, event, *args, **kwargs):
if not self.__state: return
try: fn = getattr(self, f'_{self.__state}__{event}')
except AttributeError: pass
else: return fn(*args, **kwargs)
def _fsm_set_state(self, state, *args, **kwargs):
self._fsm_event('leave')
self.__state = state
self._fsm_event('enter', *args, **kwargs)
def _fsm_get_state(self):
return self.__state