def test_composite_statechart_finished(self):
statechart = Statechart(name='statechart')
init = InitialState(statechart)
final = FinalState(statechart)
composite = CompositeState(name='composite', context=statechart)
composite_init = InitialState(composite)
composite_default = State(name='composite_default', context=composite)
composite_final = FinalState(composite)
finish = Event('finish')
Transition(start=init, end=composite)
Transition(start=composite_init, end=composite_default)
Transition(start=composite_default, end=composite_final, event=finish)
Transition(start=composite, end=final)
statechart.start()
assert statechart.is_active('composite')
assert statechart.is_active('composite_default')
assert not statechart.is_finished()
statechart.dispatch(finish)
assert statechart.is_finished()
def state():
statechart = Statechart(name="statechart")
initial_state = InitialState(statechart)
next_state = State(name="next", context=statechart)
Transition(initial_state, next_state)
statechart.start()
return next_state
def test_choice_state_transitions(self, choice, expected_state_name):
class MyMetadata(Metadata):
def __init__(self):
super().__init__()
self.value = None
class IsA(Guard):
def check(self, metadata, event):
return metadata.value == 'a'
myMetadata = MyMetadata()
myMetadata.value = choice
statechart = Statechart(name='statechart', metadata=myMetadata)
init = InitialState(statechart)
state_a = State(name='a', context=statechart)
state_b = State(name='b', context=statechart)
choice = ChoiceState(context=statechart)
Transition(start=init, end=choice)
Transition(start=choice, end=state_a, event=None, guard=IsA())
Transition(start=choice, end=state_b, event=None, guard=ElseGuard())
statechart.start()
assert statechart.is_active(expected_state_name)
def concurrent_statechart():
def composite(name, context):
composite = CompositeState(name=name, context=context)
composite.init = InitialState(composite)
composite.state = State(name='state', context=composite)
composite.final = FinalState(composite)
Transition(start=composite.init, end=composite.state)
Transition(start=composite.state,
end=composite.final,
event=Event('finish'))
return composite
sc = Statechart('simple')
sc.init = InitialState(sc)
sc.concurrent = ConcurrentState(name='compound', context=sc)
sc.concurrent.composite_a = composite(name='a', context=sc.concurrent)
sc.concurrent.composite_b = composite(name='b', context=sc.concurrent)
sc.concurrent.composite_c = composite(name='c', context=sc.concurrent)
sc.final = FinalState(sc)
Transition(start=sc.init, end=sc.concurrent)
Transition(start=sc.concurrent, end=sc.final, event=Event('finish'))
return sc
def state():
statechart = Statechart(name='statechart')
initial_state = InitialState(statechart)
next_state = State(name='next', context=statechart)
Transition(initial_state, next_state)
statechart.start()
return next_state
def test_activate_initial_state(self):
startchart = Statechart(name='statechart')
initial_state = InitialState(startchart)
default_state = State(name='default', context=startchart)
Transition(start=initial_state, end=default_state)
startchart.start()
initial_state.activate(metadata=startchart._metadata, event=None)
assert startchart.is_active('default')
def test_activate_initial_state(self):
startchart = Statechart(name='statechart')
initial_state = InitialState(startchart)
default_state = State(name='default', context=startchart)
Transition(start=initial_state, end=default_state)
startchart.start()
initial_state.activate(metadata=startchart.metadata, event=None)
assert startchart.is_active('default')
def simple_statechart():
sc = Statechart('simple')
sc.init = InitialState(sc)
sc.state = State(name='state', context=sc)
sc.final = FinalState(sc)
Transition(start=sc.init, end=sc.state)
Transition(start=sc.state, end=sc.final, event=Event('finish'))
return sc
def test_composite_statechart_finished(self):
statechart = Statechart(name="statechart")
init = InitialState(statechart)
final = FinalState(statechart)
composite = CompositeState(name="composite", context=statechart)
composite_init = InitialState(composite)
composite_default = State(name="composite_default", context=composite)
composite_final = FinalState(composite)
finish = Event("finish")
Transition(start=init, end=composite)
Transition(start=composite_init, end=composite_default)
Transition(start=composite_default, end=composite_final, event=finish)
Transition(start=composite, end=final)
statechart.start()
assert statechart.is_active("composite")
assert statechart.is_active("composite_default")
assert not statechart.is_finished()
statechart.dispatch(finish)
assert statechart.is_finished()
def test_default_transition_from_finished_composite_state(self):
statechart = Statechart(name='statechart')
statechart_init = InitialState(statechart)
composite_state = CompositeState(name='composite', context=statechart)
comp_init = InitialState(composite_state)
a = State(name='a', context=composite_state)
comp_final = FinalState(composite_state)
Transition(start=statechart_init, end=composite_state)
Transition(start=comp_init, end=a)
Transition(start=a, end=comp_final, event=Event('e'))
b = State(name='b', context=statechart)
c = State(name='c', context=statechart)
d = State(name='d', context=statechart)
Transition(start=composite_state, end=c, event=Event('f'))
Transition(start=composite_state, end=b, event=Event('e'))
Transition(start=composite_state, end=d)
statechart.start()
assert statechart.is_active('a')
statechart.dispatch(Event('e'))
assert statechart.is_active('d')
def test_transition_from_initial_state_with_event_trigger(self):
startchart = Statechart(name='statechart')
initial_state = InitialState(startchart)
default_state = State(name='default', context=startchart)
with pytest.raises(RuntimeError):
Transition(start=initial_state, end=default_state, event=Event('event'))
def test_multiple_transitions_from_initial_state(self):
startchart = Statechart(name='statechart')
initial_state = InitialState(startchart)
default_state = State(name='default', context=startchart)
Transition(start=initial_state, end=default_state)
with pytest.raises(RuntimeError):
Transition(start=initial_state, end=default_state)
def test_cannot_create_multiple_shallow_history_states(self):
startchart = Statechart(name='statechart')
composite_state = CompositeState(name='composite', context=startchart)
ShallowHistoryState(composite_state)
with pytest.raises(RuntimeError):
ShallowHistoryState(composite_state)
def test_add_transition(self):
statechart = Statechart(name='statechart')
initial_state = InitialState(statechart)
default_state = State(name='default', context=statechart)
default_transition = Transition(start=initial_state, end=default_state)
assert default_transition in initial_state._transitions
def test_default_transition_from_finished_composite_state(self):
statechart = Statechart(name="statechart")
statechart_init = InitialState(statechart)
composite_state = CompositeState(name="composite", context=statechart)
comp_init = InitialState(composite_state)
a = State(name="a", context=composite_state)
comp_final = FinalState(composite_state)
Transition(start=statechart_init, end=composite_state)
Transition(start=comp_init, end=a)
Transition(start=a, end=comp_final, event=Event("e"))
b = State(name="b", context=statechart)
c = State(name="c", context=statechart)
d = State(name="d", context=statechart)
Transition(start=composite_state, end=c, event=Event("f"))
Transition(start=composite_state, end=b, event=Event("e"))
Transition(start=composite_state, end=d)
statechart.start()
assert statechart.is_active("a")
statechart.dispatch(Event("e"))
assert statechart.is_active("d")
def test_active_states(self):
statechart = Statechart(name='a')
statechart_init = InitialState(statechart)
b = CompositeState(name='b', context=statechart)
b_init = InitialState(b)
c = CompositeState(name='c', context=b)
c_init = InitialState(c)
d = State(name='d', context=c)
Transition(start=statechart_init, end=b)
Transition(start=b_init, end=c)
Transition(start=c_init, end=d)
statechart.start()
assert statechart.active_states() == [statechart, b, c, d]
def test_light_switch(self):
"""
--Flick-->
init ---> Off On
<--Flick-- Entry: Light = ON
Exit: Light = OFF
Internal:
Flick: Count++
"""
class On(State):
def __init__(self, name, context, data):
State.__init__(self, name=name, context=context)
self.data = data
def entry(self, event):
self.data['light'] = 'on'
def exit(self, event):
self.data['light'] = 'off'
def handle_internal(self, event):
if event.name == 'flick':
self.data['on_count'] += 1
sm = Statechart(name='sm')
data = dict(light='off', on_count=0)
sm.initial_state = InitialState(context=sm)
off = State(name='off', context=sm)
on = On(name='on', context=sm, data=data)
Transition(start=sm.initial_state, end=off)
Transition(start=off, end=on, event=Event('flick'))
Transition(start=on, end=off, event=Event('flick'))
sm.start()
assert data['light'] == 'off'
sm.dispatch(Event('flick'))
assert data['light'] == 'on'
assert data['on_count'] == 0
sm.dispatch(Event('flick'))
assert data['light'] == 'off'
assert data['on_count'] == 1
def test_transition_from_initial_state_with_guard_condition(self):
class MyGuard(Guard):
def check(self, metadata, event):
return False
startchart = Statechart(name='statechart')
initial_state = InitialState(startchart)
default_state = State(name='default', context=startchart)
with pytest.raises(RuntimeError):
Transition(start=initial_state, end=default_state, event=None, guard=MyGuard())
def test_choice_state_transitions(self, state_name, expected_state_name):
def is_a(**kwargs):
return state_name == 'a'
statechart = Statechart(name='statechart')
init = InitialState(statechart)
state_a = State(name='a', context=statechart)
state_b = State(name='b', context=statechart)
choice = ChoiceState(context=statechart)
Transition(start=init, end=choice)
Transition(start=choice, end=state_a, event=None, guard=is_a)
Transition(start=choice, end=state_b, event=None, guard=None) # else
statechart.start()
assert statechart.is_active(expected_state_name)
def main() -> None:
"""Code here shows how everything is wired together.
The following lines are the expected output:
state 'state-a' got event 'None'
state 'state-b' got event 'Event(name="to-state-b", data={})'
"""
# Create the state machine -- the root context of every workflow.
state_machine = Statechart("state-machine")
# Create the workflow metadata with all the data accessible to all states and workflows.
metadata = WorkflowMetadata(a=10, b="foo", c="bar")
# Create the workflow factory backed by the workflow metadata.
factory = WorkflowFactory(metadata)
# Create the main workflow using the workflow factory.
main_workflow = factory.create_workflow("main-workflow", state_machine, MainWorkflow)
# Set up the main transitions.
init = InitialState(state_machine)
final = FinalState(state_machine)
Transition(init, main_workflow)
Transition(main_workflow, final, event=Event("final"))
# Run the state machine.
state_machine.start()
state_machine.dispatch(Event("to-state-b"))
def test_simple_statechart_finished(self):
statechart = Statechart(name='statechart')
init = InitialState(statechart)
default = State(name='default', context=statechart)
final = FinalState(statechart)
finish = Event('finish')
Transition(start=init, end=default)
Transition(start=default, end=final, event=finish)
statechart.start()
assert statechart.is_active('default')
assert not statechart.is_finished()
statechart.dispatch(finish)
assert statechart.is_finished()
def test_transition_from_initial_state_with_guard_condition(self):
startchart = Statechart(name='statechart')
initial_state = InitialState(startchart)
default_state = State(name='default', context=startchart)
def my_guard(**kwargs):
return False
with pytest.raises(RuntimeError):
Transition(start=initial_state,
end=default_state,
event=None,
guard=my_guard)
def test_simple_statechart_finished(self):
statechart = Statechart(name="statechart")
init = InitialState(statechart)
default = State(name="default", context=statechart)
final = FinalState(statechart)
finish = Event("finish")
Transition(start=init, end=default)
Transition(start=default, end=final, event=finish)
statechart.start()
assert statechart.is_active("default")
assert not statechart.is_finished()
statechart.dispatch(finish)
assert statechart.is_finished()
def test_default_transition_isnt_executed_from_unfinished_composite_state(
self):
statechart = Statechart(name='statechart')
statechart_init = InitialState(statechart)
composite_state = CompositeState(name='composite', context=statechart)
comp_init = InitialState(composite_state)
a = State(name='a', context=composite_state)
Transition(start=statechart_init, end=composite_state)
Transition(start=comp_init, end=a)
b = State(name='b', context=statechart)
Transition(start=composite_state, end=b)
statechart.start()
assert statechart.is_active('a')
statechart.dispatch(Event('e'))
assert statechart.is_active('a')
def test_default_transition_isnt_executed_from_unfinished_composite_state(self):
statechart = Statechart(name="statechart")
statechart_init = InitialState(statechart)
composite_state = CompositeState(name="composite", context=statechart)
comp_init = InitialState(composite_state)
a = State(name="a", context=composite_state)
Transition(start=statechart_init, end=composite_state)
Transition(start=comp_init, end=a)
b = State(name="b", context=statechart)
Transition(start=composite_state, end=b)
statechart.start()
assert statechart.is_active("a")
statechart.dispatch(Event("e"))
assert statechart.is_active("a")
class Main:
def __init__(self):
self.sm = Statechart()
self.ti = TimerService()
self.cb = Callback(self.sm)
def setup(self):
self.sm.timer_service = self.ti
self.sm.operation_callback = self.cb
self.sm.enter()
def run(self):
try:
while True:
self.sm.user.raise_clock()
time.sleep(1)
self.sm.run_cycle()
except KeyboardInterrupt:
self.shutdown()
def shutdown(self):
print('State machine shuts down.')
self.sm.exit()
print('Bye!')
def test_activate_shallow_history_state(self):
"""
statechart:
statechart_init
|
*** csa ********************** *** csb *************
* * * *
* csa_init-csa_hist * * csb_init *
* | * --J--> * | *
* A --I--> B * <--K-- * C --L--> D *
* * * *
****************************** *********************
"""
# Top level states
statechart = Statechart(name='statechart')
csa = CompositeState(name='csa', context=statechart)
csb = CompositeState(name='csb', context=statechart)
# Child states
# statechart
statechart_init = InitialState(statechart)
# csa
csa_init = InitialState(csa)
csa_hist = ShallowHistoryState(context=csa)
A = State(name='A', context=csa)
B = State(name='B', context=csa)
# csb
csb_init = InitialState(csb)
C = State(name='C', context=csb)
D = State(name='D', context=csb)
# Events
I = Event(name='I')
J = Event(name='J')
K = Event(name='K')
L = Event(name='L')
# Transitions between states & event triggers
Transition(start=statechart_init, end=csa)
Transition(start=csa_init, end=csa_hist)
Transition(start=csa_hist, end=A)
Transition(start=A, end=B, event=I)
Transition(start=csa, end=csb, event=J)
Transition(start=csb, end=csa, event=K)
Transition(start=csb_init, end=C)
Transition(start=C, end=D, event=L)
# Execute statechart
statechart.start()
statechart.dispatch(I)
# Assert we have reached state B, history should restore this state
assert statechart.is_active('B')
statechart.dispatch(J)
# Assert we have reached state C
assert statechart.is_active('C')
statechart.dispatch(K)
# Assert the history state has restored state B
assert statechart.is_active('B')
def test_activate_shallow_history_state(self):
"""
statechart:
statechart_init
|
*** csa ********************** *** csb *************
* * * *
* csa_init-csa_hist * * csb_init *
* | * --J--> * | *
* A --I--> B * <--K-- * C --L--> D *
* * * *
****************************** *********************
"""
# Top level states
statechart = Statechart(name='statechart')
csa = CompositeState(name='csa', context=statechart)
csb = CompositeState(name='csb', context=statechart)
# Child states
# statechart
statechart_init = InitialState(statechart)
# csa
csa_init = InitialState(csa)
csa_hist = ShallowHistoryState(context=csa)
A = State(name='A', context=csa)
B = State(name='B', context=csa)
# csb
csb_init = InitialState(csb)
C = State(name='C', context=csb)
D = State(name='D', context=csb)
# Events
I = Event(name='I')
J = Event(name='J')
K = Event(name='K')
L = Event(name='L')
# Transitions between states & event triggers
Transition(start=statechart_init, end=csa)
Transition(start=csa_init, end=csa_hist)
Transition(start=csa_hist, end=A)
Transition(start=A, end=B, event=I)
Transition(start=csa, end=csb, event=J)
Transition(start=csb, end=csa, event=K)
Transition(start=csb_init, end=C)
Transition(start=C, end=D, event=L)
# Execute statechart
statechart.start()
statechart.dispatch(I)
# Assert we have reached state B, history should restore this state
assert statechart.is_active('B')
statechart.dispatch(J)
# Assert we have reached state C
assert statechart.is_active('C')
statechart.dispatch(K)
# Assert the history state has restored state B
assert statechart.is_active('B')
def test_keyboard_example(self):
"""
Test classic concurrent state keyboard example with concurrent states
for caps, num and scroll lock.
init - -
|
v
-- keyboard --------------------------------------
| |
| init ---> --caps lock off -- |
| --- | | <-- |
| | -----------------| | |
| caps lock pressed caps lock pressed |
| | -- caps lock on -- | |
| --> | | --- |
| ------------------ |
| |
--------------------------------------------------
| |
| init ---> --num lock off --- |
| --- | | <-- |
| | -----------------| | |
| num lock pressed num lock pressed |
| | -- num lock on --- | |
| --> | | --- |
| ------------------ |
| |
--------------------------------------------------
| |
| init ---> -- scroll lock off -- |
| --- | | <-- |
| | ---------------------| | |
| scroll lock pressed scroll lock pressed |
| | -- scroll lock on ---| | |
| --> | | --- |
| ---------------------- |
| |
--------------------------------------------------
"""
statechart = Statechart(name="statechart")
start_state = InitialState(statechart)
keyboard = ConcurrentState(name="keyboard", context=statechart)
Transition(start=start_state, end=keyboard)
caps_lock = CompositeState(name="caps_lock", context=keyboard)
caps_lock_initial = InitialState(caps_lock)
caps_lock_on = State(name="caps_lock_on", context=caps_lock)
caps_lock_off = State(name="caps_lock_off", context=caps_lock)
caps_lock_pressed = Event(name="caps_lock_pressed")
Transition(start=caps_lock_initial, end=caps_lock_off)
Transition(start=caps_lock_on, end=caps_lock_off, event=caps_lock_pressed)
Transition(start=caps_lock_off, end=caps_lock_on, event=caps_lock_pressed)
num_lock = CompositeState(name="num_lock", context=keyboard)
num_lock_initial = InitialState(num_lock)
num_lock_on = State(name="num_lock_on", context=num_lock)
num_lock_off = State(name="num_lock_off", context=num_lock)
num_lock_pressed = Event(name="num_lock_pressed")
Transition(start=num_lock_initial, end=num_lock_off)
Transition(start=num_lock_on, end=num_lock_off, event=num_lock_pressed)
Transition(start=num_lock_off, end=num_lock_on, event=num_lock_pressed)
scroll_lock = CompositeState(name="scroll_lock", context=keyboard)
scroll_lock_initial = InitialState(scroll_lock)
scroll_lock_on = State(name="scroll_lock_on", context=scroll_lock)
scroll_lock_off = State(name="scroll_lock_off", context=scroll_lock)
scroll_lock_pressed = Event(name="scroll_lock_pressed")
Transition(start=scroll_lock_initial, end=scroll_lock_off)
Transition(start=scroll_lock_on, end=scroll_lock_off, event=scroll_lock_pressed)
Transition(start=scroll_lock_off, end=scroll_lock_on, event=scroll_lock_pressed)
statechart.start()
assert statechart.is_active("keyboard")
assert statechart.is_active("caps_lock_off")
assert statechart.is_active("num_lock_off")
assert statechart.is_active("scroll_lock_off")
statechart.dispatch(event=caps_lock_pressed)
assert statechart.is_active("caps_lock_on")
statechart.dispatch(event=num_lock_pressed)
assert statechart.is_active("num_lock_on")
statechart.dispatch(event=scroll_lock_pressed)
assert statechart.is_active("scroll_lock_on")
statechart.dispatch(event=caps_lock_pressed)
assert statechart.is_active("caps_lock_off")
statechart.dispatch(event=num_lock_pressed)
assert statechart.is_active("num_lock_off")
statechart.dispatch(event=scroll_lock_pressed)
assert statechart.is_active("scroll_lock_off")
def test_create_shallow_history_state(self):
startchart = Statechart(name='statechart')
composite_state = CompositeState(name='composite', context=startchart)
ShallowHistoryState(composite_state)
def test_submachines(self):
statechart = Statechart(name="statechart")
init = InitialState(statechart)
top_a = self.Submachine("top a", statechart)
top_b = self.Submachine("top b", statechart)
top_a_to_b = Event("top ab")
Transition(start=init, end=top_a)
Transition(start=top_a, end=top_b, event=top_a_to_b)
statechart.start()
assert statechart.is_active("top a")
assert statechart.is_active("sub state a")
statechart.dispatch(top_a.sub_a_to_b)
assert statechart.is_active("top a")
assert statechart.is_active("sub state b")
statechart.dispatch(top_a_to_b)
assert statechart.is_active("top b")
assert statechart.is_active("sub state a")
statechart.dispatch(top_a.sub_a_to_b)
assert statechart.is_active("top b")
assert statechart.is_active("sub state b")
def test_submachines(self):
statechart = Statechart(name='statechart')
init = InitialState(statechart)
top_a = self.Submachine('top a', statechart)
top_b = self.Submachine('top b', statechart)
top_a_to_b = Event('top ab')
Transition(start=init, end=top_a)
Transition(start=top_a, end=top_b, event=top_a_to_b)
statechart.start()
assert statechart.is_active('top a')
assert statechart.is_active('sub state a')
statechart.dispatch(top_a.sub_a_to_b)
assert statechart.is_active('top a')
assert statechart.is_active('sub state b')
statechart.dispatch(top_a_to_b)
assert statechart.is_active('top b')
assert statechart.is_active('sub state a')
statechart.dispatch(top_a.sub_a_to_b)
assert statechart.is_active('top b')
assert statechart.is_active('sub state b')
def test_missing_transition_from_initial_state(self):
startchart = Statechart(name='statechart')
InitialState(startchart)
with pytest.raises(RuntimeError):
startchart.start()
def test_activate_multiple_shallow_history_states(self):
"""
statechart:
statechart_init
|
*** csa ***************************************************** *** csc *************
* * * *
* csa_init--csa_hist * * csc_init *
* | * --K--> * | *
* A --I--> *** csb *********************** * <--L-- * D --M--> E *
* * * * * *
* * csb_init--csb_hist * * *********************
* * | * *
* * B --J--> C * *
* * * *
* ******************************* *
* *
*************************************************************
"""
# Top level states
statechart = Statechart(name='statechart')
csa = CompositeState(name='csa', context=statechart)
csb = CompositeState(name='csb', context=csa)
csc = CompositeState(name='csc', context=statechart)
# Child states
# statechart
statechart_init = InitialState(statechart)
# csa
csa_init = InitialState(csa)
csa_hist = ShallowHistoryState(context=csa)
A = State(name='A', context=csa)
# csb
csb_init = InitialState(csb)
csb_hist = ShallowHistoryState(context=csb)
B = State(name='B', context=csb)
C = State(name='C', context=csb)
# csc
csc_init = InitialState(csc)
D = State(name='D', context=csc)
E = State(name='E', context=csc)
# Events
I = Event(name='I')
J = Event(name='J')
K = Event(name='K')
L = Event(name='L')
M = Event(name='M')
# Transitions between states & event triggers
Transition(start=statechart_init, end=csa)
Transition(start=csa_init, end=csa_hist)
Transition(start=csa_hist, end=A)
Transition(start=A, end=csb, event=I)
Transition(start=csb_init, end=csb_hist)
Transition(start=csb_hist, end=B)
Transition(start=B, end=C, event=J)
Transition(start=csa, end=csc, event=K)
Transition(start=csc, end=csa, event=L)
Transition(start=csc_init, end=D)
Transition(start=D, end=E, event=M)
# Execute statechart
statechart.start()
statechart.dispatch(I)
assert statechart.is_active('B')
statechart.dispatch(J)
# Assert we have reached state C, csb's history state should restore
# this state
assert statechart.is_active('C')
statechart.dispatch(K)
# Assert we have reached state D
assert statechart.is_active('D')
statechart.dispatch(L)
# Assert the history state has restored state C
assert statechart.is_active('C')
def test_keyboard_example(self):
"""
Test classic concurrent state keyboard example with concurrent states
for caps, num and scroll lock.
init - -
|
v
-- keyboard --------------------------------------
| |
| init ---> --caps lock off -- |
| --- | | <-- |
| | -----------------| | |
| caps lock pressed caps lock pressed |
| | -- caps lock on -- | |
| --> | | --- |
| ------------------ |
| |
--------------------------------------------------
| |
| init ---> --num lock off --- |
| --- | | <-- |
| | -----------------| | |
| num lock pressed num lock pressed |
| | -- num lock on --- | |
| --> | | --- |
| ------------------ |
| |
--------------------------------------------------
| |
| init ---> -- scroll lock off -- |
| --- | | <-- |
| | ---------------------| | |
| scroll lock pressed scroll lock pressed |
| | -- scroll lock on ---| | |
| --> | | --- |
| ---------------------- |
| |
--------------------------------------------------
"""
statechart = Statechart(name='statechart')
start_state = InitialState(statechart)
keyboard = ConcurrentState(name='keyboard', context=statechart)
Transition(start=start_state, end=keyboard)
caps_lock = CompositeState(name='caps_lock', context=keyboard)
caps_lock_initial = InitialState(caps_lock)
caps_lock_on = State(name='caps_lock_on', context=caps_lock)
caps_lock_off = State(name='caps_lock_off', context=caps_lock)
caps_lock_pressed = Event(name='caps_lock_pressed')
Transition(start=caps_lock_initial, end=caps_lock_off)
Transition(start=caps_lock_on,
end=caps_lock_off,
event=caps_lock_pressed)
Transition(start=caps_lock_off,
end=caps_lock_on,
event=caps_lock_pressed)
num_lock = CompositeState(name='num_lock', context=keyboard)
num_lock_initial = InitialState(num_lock)
num_lock_on = State(name='num_lock_on', context=num_lock)
num_lock_off = State(name='num_lock_off', context=num_lock)
num_lock_pressed = Event(name='num_lock_pressed')
Transition(start=num_lock_initial, end=num_lock_off)
Transition(start=num_lock_on, end=num_lock_off, event=num_lock_pressed)
Transition(start=num_lock_off, end=num_lock_on, event=num_lock_pressed)
scroll_lock = CompositeState(name='scroll_lock', context=keyboard)
scroll_lock_initial = InitialState(scroll_lock)
scroll_lock_on = State(name='scroll_lock_on', context=scroll_lock)
scroll_lock_off = State(name='scroll_lock_off', context=scroll_lock)
scroll_lock_pressed = Event(name='scroll_lock_pressed')
Transition(start=scroll_lock_initial, end=scroll_lock_off)
Transition(start=scroll_lock_on,
end=scroll_lock_off,
event=scroll_lock_pressed)
Transition(start=scroll_lock_off,
end=scroll_lock_on,
event=scroll_lock_pressed)
statechart.start()
assert statechart.is_active('keyboard')
assert statechart.is_active('caps_lock_off')
assert statechart.is_active('num_lock_off')
assert statechart.is_active('scroll_lock_off')
statechart.dispatch(event=caps_lock_pressed)
assert statechart.is_active('caps_lock_on')
statechart.dispatch(event=num_lock_pressed)
assert statechart.is_active('num_lock_on')
statechart.dispatch(event=scroll_lock_pressed)
assert statechart.is_active('scroll_lock_on')
statechart.dispatch(event=caps_lock_pressed)
assert statechart.is_active('caps_lock_off')
statechart.dispatch(event=num_lock_pressed)
assert statechart.is_active('num_lock_off')
statechart.dispatch(event=scroll_lock_pressed)
assert statechart.is_active('scroll_lock_off')
def test_activate_multiple_shallow_history_states(self):
"""
statechart:
statechart_init
|
*** csa ***************************************************** *** csc *************
* * * *
* csa_init--csa_hist * * csc_init *
* | * --K--> * | *
* A --I--> *** csb *********************** * <--L-- * D --M--> E *
* * * * * *
* * csb_init--csb_hist * * *********************
* * | * *
* * B --J--> C * *
* * * *
* ******************************* *
* *
*************************************************************
"""
# Top level states
statechart = Statechart(name='statechart')
csa = CompositeState(name='csa', context=statechart)
csb = CompositeState(name='csb', context=csa)
csc = CompositeState(name='csc', context=statechart)
# Child states
# statechart
statechart_init = InitialState(statechart)
# csa
csa_init = InitialState(csa)
csa_hist = ShallowHistoryState(context=csa)
A = State(name='A', context=csa)
# csb
csb_init = InitialState(csb)
csb_hist = ShallowHistoryState(context=csb)
B = State(name='B', context=csb)
C = State(name='C', context=csb)
# csc
csc_init = InitialState(csc)
D = State(name='D', context=csc)
E = State(name='E', context=csc)
# Events
I = Event(name='I')
J = Event(name='J')
K = Event(name='K')
L = Event(name='L')
M = Event(name='M')
# Transitions between states & event triggers
Transition(start=statechart_init, end=csa)
Transition(start=csa_init, end=csa_hist)
Transition(start=csa_hist, end=A)
Transition(start=A, end=csb, event=I)
Transition(start=csb_init, end=csb_hist)
Transition(start=csb_hist, end=B)
Transition(start=B, end=C, event=J)
Transition(start=csa, end=csc, event=K)
Transition(start=csc, end=csa, event=L)
Transition(start=csc_init, end=D)
Transition(start=D, end=E, event=M)
# Execute statechart
statechart.start()
statechart.dispatch(I)
assert statechart.is_active('B')
statechart.dispatch(J)
# Assert we have reached state C, csb's history state should restore
# this state
assert statechart.is_active('C')
statechart.dispatch(K)
# Assert we have reached state D
assert statechart.is_active('D')
statechart.dispatch(L)
# Assert the history state has restored state C
assert statechart.is_active('C')
def test_create_initial_state(self):
startchart = Statechart(name='statechart')
InitialState(startchart)
def test_create_state(self):
statechart = Statechart(name='statechart')
State(name='anon', context=statechart)
def test_missing_transition_from_initial_state(self):
startchart = Statechart(name='statechart')
InitialState(startchart)
with pytest.raises(RuntimeError):
startchart.start()
def test_add_transition(self):
statechart = Statechart(name='statechart')
final_state = FinalState(statechart)
with pytest.raises(RuntimeError):
Transition(start=final_state, end=statechart)
def test_create_statechart(self):
Statechart(name='statechart')
