feat(experimental): removed expect_override (#676) and added `trigg…

…er` and `with_trigger_decorator`

expect_override (introduced recently in #676) was revoked as a heterogenous model structure is not to be expecred

transitions/experimental/decoration.py

@@ -1,3 +1,33 @@
-def expect_override(func):
-    setattr(func, "expect_override", True)
-    return func
+from transitions.core import listify
+from collections import deque
+
+_attribute_name = "transition_definitions"
+
+
+def with_trigger_decorator(cls):
+    add_model = getattr(cls, "add_model")
+
+    def add_model_override(self, model, initial=None) -> None:
+        self.model_override = True
+        for model in listify(model):
+            model = self if model == "self" else model
+            for name, method in model.__class__.__dict__.items():
+                for spec in getattr(method, _attribute_name, []):
+                    self.add_transition(name, **spec)
+        add_model(self, model, initial)
+
+    setattr(cls, 'add_model', add_model_override)
+    return cls
+
+
+def trigger(source, dest, conditions=None, unless=None, before=None, after=None, prepare=None):
+    def _outer(trigger_func):
+        if not hasattr(trigger_func, _attribute_name):
+            setattr(trigger_func, _attribute_name, deque())
+        getattr(trigger_func, _attribute_name).appendleft({
+            "source": source, "dest": dest, "conditions": conditions, "unless": unless, "before": before,
+            "after": after, "prepare": prepare
+        })
+        return trigger_func
+
+    return _outer

transitions/experimental/decoration.pyi

@@ -1,6 +1,11 @@
-from typing import Callable, ParamSpec
+from typing import Union, Type, Callable
+from transitions.core import StateIdentifier, CallbacksArg, CallbackFunc, Machine
 
-P = ParamSpec("P")
 
+def with_trigger_decorator(cls: Type[Machine]) -> Type[Machine]: ...
 
-def expect_override(func: Callable[P, bool | None]) -> Callable[P, bool | None]: ...
+def trigger(source: Union[StateIdentifier, list[StateIdentifier]],
+            dest: StateIdentifier | None = ...,
+            conditions: CallbacksArg = ..., unless: CallbacksArg = ...,
+            before: CallbacksArg = ..., after: CallbacksArg = ...,
+            prepare: CallbacksArg = ...) -> Callable[[CallbackFunc], CallbackFunc]: ...