fix: Fix type hints for Python 3.9 as the | operator is not supported

statemachine/io/__init__.py

@@ -11,42 +11,37 @@
 from ..statemachine import StateMachine
 from ..transition_list import TransitionList
 
-CallbacksType = str | Callable | List[str] | List[Callable]
-
 
 class TransitionDict(TypedDict, total=False):
     target: str
-    event: str | None
+    event: "str | None"
     internal: bool
     validators: bool
-    cond: CallbacksType
-    unless: CallbacksType
-    on: CallbacksType
-    before: CallbacksType
-    after: CallbacksType
+    cond: "str | Callable | List[str] | List[Callable]"
+    unless: "str | Callable | List[str] | List[Callable]"
+    on: "str | Callable | List[str] | List[Callable]"
+    before: "str | Callable | List[str] | List[Callable]"
+    after: "str | Callable | List[str] | List[Callable]"
 
 
-TransitionsDict = Dict[str | None, List[TransitionDict]]
+TransitionsDict = Dict["str | None", List[TransitionDict]]
 
 
 class StateDict(TypedDict, total=False):
     name: str
     value: Any
     initial: bool
     final: bool
-    enter: CallbacksType
-    exit: CallbacksType
+    enter: "str | Callable | List[str] | List[Callable]"
+    exit: "str | Callable | List[str] | List[Callable]"
 
 
 class StateWithTransitionsDict(StateDict, total=False):
     on: TransitionsDict
 
 
-StateOptions = StateDict | StateWithTransitionsDict
-
-
 def create_machine_class_from_definition(
-    name: str, states: Mapping[str, StateOptions], **definition
+    name: str, states: Mapping[str, "StateDict | StateWithTransitionsDict"], **definition
 ) -> StateMachine:  # noqa: C901
     """
     Creates a StateMachine class from a dictionary definition, using the StateMachineMetaclass.

statemachine/io/scxml/actions.py

@@ -34,7 +34,7 @@ class ParseTime:
     pattern = re.compile(r"(\d+)?(\.\d+)?(s|ms)")
 
     @classmethod
-    def parse_delay(cls, delay: str | None, delayexpr: str | None, **kwargs):
+    def parse_delay(cls, delay: "str | None", delayexpr: "str | None", **kwargs):
         if delay:
             return cls.time_in_ms(delay)
         elif delayexpr:
@@ -377,7 +377,7 @@ def data_initializer(machine: StateMachine, **kwargs):
     return data_initializer
 
 
-def create_datamodel_action_callable(action: DataModel) -> Callable | None:
+def create_datamodel_action_callable(action: DataModel) -> "Callable | None":
     data_elements = [_create_dataitem_callable(item) for item in action.data]
     data_elements.extend([create_script_action_callable(script) for script in action.scripts])
 

statemachine/io/scxml/parser.py

@@ -69,7 +69,7 @@ def parse_scxml(scxml_content: str) -> StateMachineDefinition:
     return definition
 
 
-def parse_datamodel(root: ET.Element) -> DataModel | None:
+def parse_datamodel(root: ET.Element) -> "DataModel | None":
     data_model = DataModel()
 
     for datamodel_elem in root.findall(".//datamodel"):
@@ -95,7 +95,7 @@ def parse_datamodel(root: ET.Element) -> DataModel | None:
 
 def parse_state(
     state_elem: ET.Element,
-    initial_state: str | None,
+    initial_state: "str | None",
     is_final: bool = False,
     is_parallel: bool = False,
 ) -> State:

statemachine/io/scxml/processor.py

@@ -3,7 +3,6 @@
 from typing import Dict
 from typing import List
 
-from .. import StateOptions
 from .. import StateWithTransitionsDict
 from .. import TransitionDict
 from .. import TransitionsDict
@@ -33,7 +32,7 @@ def parse_scxml(self, sm_name: str, scxml_content: str):
         self.process_definition(definition, location=sm_name)
 
     def process_definition(self, definition, location: str):
-        states_dict: Dict[str, StateOptions] = {}
+        states_dict: Dict[str, StateWithTransitionsDict] = {}
         for state_id, state in definition.states.items():
             state_dict = StateWithTransitionsDict()
             if state.initial:

statemachine/io/scxml/schema.py

@@ -27,13 +27,13 @@ class AssignAction(Action):
 
 @dataclass
 class LogAction(Action):
-    label: str | None
+    label: "str | None"
     expr: str
 
 
 @dataclass
 class IfBranch(Action):
-    cond: str | None
+    cond: "str | None"
     actions: List[Action] = field(default_factory=list)
 
     def append(self, action: Action):
@@ -49,36 +49,36 @@ class IfAction(Action):
 class ForeachAction(Action):
     array: str
     item: str
-    index: str | None
+    index: "str | None"
     content: ExecutableContent
 
 
 @dataclass
 class Param:
     name: str
-    expr: str | None
-    location: str | None = None
+    expr: "str | None"
+    location: "str | None" = None
 
 
 @dataclass
 class SendAction(Action):
-    event: str | None = None
-    eventexpr: str | None = None
-    target: str | None = None
-    type: str | None = None
-    id: str | None = None
-    idlocation: str | None = None
-    delay: str | None = None
-    delayexpr: str | None = None
-    namelist: str | None = None
+    event: "str | None" = None
+    eventexpr: "str | None" = None
+    target: "str | None" = None
+    type: "str | None" = None
+    id: "str | None" = None
+    idlocation: "str | None" = None
+    delay: "str | None" = None
+    delayexpr: "str | None" = None
+    namelist: "str | None" = None
     params: List[Param] = field(default_factory=list)
-    content: str | None = None
+    content: "str | None" = None
 
 
 @dataclass
 class CancelAction(Action):
-    sendid: str | None = None
-    sendidexpr: str | None = None
+    sendid: "str | None" = None
+    sendidexpr: "str | None" = None
 
 
 @dataclass
@@ -89,9 +89,9 @@ class ScriptAction(Action):
 @dataclass
 class Transition:
     target: str
-    event: str | None = None
-    cond: str | None = None
-    on: ExecutableContent | None = None
+    event: "str | None" = None
+    cond: "str | None" = None
+    on: "ExecutableContent | None" = None
 
 
 @dataclass
@@ -109,9 +109,9 @@ class State:
 @dataclass
 class DataItem:
     id: str
-    src: str | None
-    expr: str | None
-    content: str | None
+    src: "str | None"
+    expr: "str | None"
+    content: "str | None"
 
 
 @dataclass
@@ -123,5 +123,5 @@ class DataModel:
 @dataclass
 class StateMachineDefinition:
     states: Dict[str, State] = field(default_factory=dict)
-    initial_state: str | None = None
-    datamodel: DataModel | None = None
+    initial_state: "str | None" = None
+    datamodel: "DataModel | None" = None