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from automat import MethodicalMachine
class CoffeeBrewer(object):
_machine = MethodicalMachine()
@_machine.input()
def brew_button(self):
"The user pressed the 'brew' button."
@_machine.output()
def _heat_the_heating_element(self):
"Heat up the heating element, which should cause coffee to happen."
# self._heating_element.turn_on()
@_machine.state()
def have_beans(self):
"In this state, you have some beans."
@_machine.state(initial=True)
def dont_have_beans(self):
"In this state, you don't have any beans."
@_machine.input()
def put_in_beans(self, beans):
"The user put in some beans."
@_machine.output()
def _save_beans(self, beans):
"The beans are now in the machine; save them."
self._beans = beans
@_machine.output()
def _describe_coffee(self):
return "A cup of coffee made with {}.".format(self._beans)
dont_have_beans.upon(put_in_beans, enter=have_beans, outputs=[_save_beans])
have_beans.upon(
brew_button,
enter=dont_have_beans,
outputs=[_heat_the_heating_element, _describe_coffee],
collector=lambda iterable: list(iterable)[-1],
)
cb = CoffeeBrewer()
cb.put_in_beans("real good beans")
print(cb.brew_button())
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