feat: SCXML processing model

Author: fgmacedo

docs/processing_model.md

@@ -77,4 +77,3 @@ after 'connection_succeed' from 'connecting' to 'connected'
 ```{note}
 Note that the events `connect` and `connection_succeed` are executed sequentially, and the `connect.after` runs on the expected order.
 ```
-

docs/transitions.md

@@ -84,7 +84,7 @@ Syntax:
 >>> draft = State("Draft")
 
 >>> draft.to.itself()
-TransitionList([Transition(State('Draft', ...
+TransitionList([Transition('Draft', 'Draft', event='', internal=False)])
 
 ```
 
@@ -101,7 +101,7 @@ Syntax:
 >>> draft = State("Draft")
 
 >>> draft.to.itself(internal=True)
-TransitionList([Transition(State('Draft', ...
+TransitionList([Transition('Draft', 'Draft', event='', internal=True)])
 
 ```
 

pyproject.toml

@@ -170,6 +170,7 @@ select = [
 ignore = [
     "UP006", # `use-pep585-annotation` Requires Python3.9+
     "UP035", # `use-pep585-annotation` Requires Python3.9+
+    "UP037", # `use-pep586-annotation` Requires Python3.9+
     "UP038", # `use-pep585-annotation` Requires Python3.9+
 ]
 

statemachine/engines/async_.py

@@ -5,7 +5,6 @@
 from ..event_data import EventData
 from ..event_data import TriggerData
 from ..exceptions import TransitionNotAllowed
-from ..i18n import _
 from .base import BaseEngine
 
 if TYPE_CHECKING:
@@ -46,7 +45,7 @@ async def processing_loop(self):
         first_result = self._sentinel
         try:
             # Execute the triggers in the queue in FIFO order until the queue is empty
-            while self._running and not self.empty():
+            while self.running and not self.empty():
                 trigger_data = self.pop()
                 current_time = time()
                 if trigger_data.execution_time > current_time: