Metadata-Version: 1.1
Name: python-statemachine
Version: 0.7.0
Summary: Python Finite State Machines made easy.
Home-page: https://github.com/fgmacedo/python-statemachine
Author: Fernando Macedo
Author-email: fgmacedo@gmail.com
License: MIT license
Description: ====================
        Python State Machine
        ====================
        
        
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        Python `finite-state machines <https://en.wikipedia.org/wiki/Finite-state_machine>`_ made easy.
        
        
        * Free software: MIT license
        * Documentation: https://python-statemachine.readthedocs.io.
        
        
        Getting started
        ===============
        
        To install Python State Machine, run this command in your terminal:
        
        .. code-block:: console
        
            $ pip install python-statemachine
        
        
        Define your state machine:
        
        .. code-block:: python
        
            from statemachine import StateMachine, State
        
            class TrafficLightMachine(StateMachine):
                green = State('Green', initial=True)
                yellow = State('Yellow')
                red = State('Red')
        
                slowdown = green.to(yellow)
                stop = yellow.to(red)
                go = red.to(green)
        
        
        You can now create an instance:
        
        >>> traffic_light = TrafficLightMachine()
        
        And inspect about the current state:
        
        >>> traffic_light.current_state
        State('Green', identifier='green', value='green', initial=True)
        >>> traffic_light.current_state == TrafficLightMachine.green == traffic_light.green
        True
        
        For each state, there's a dinamically created property in the form ``is_<state.identifier>``, that
        returns ``True`` if the current status matches the query:
        
        >>> traffic_light.is_green
        True
        >>> traffic_light.is_yellow
        False
        >>> traffic_light.is_red
        False
        
        Query about metadata:
        
        >>> [s.identifier for s in m.states]
        ['green', 'red', 'yellow']
        >>> [t.identifier for t in m.transitions]
        ['go', 'slowdown', 'stop']
        
        Call a transition:
        
        >>> traffic_light.slowdown()
        
        And check for the current status:
        
        >>> traffic_light.current_state
        State('Yellow', identifier='yellow', value='yellow', initial=False)
        >>> traffic_light.is_yellow
        True
        
        You can't run a transition from an invalid state:
        
        >>> traffic_light.is_yellow
        True
        >>> traffic_light.slowdown()
        Traceback (most recent call last):
        ...
        LookupError: Can't slowdown when in Yellow.
        
        You can also trigger events in an alternative way, calling the ``run(<transition.identificer>)`` method:
        
        >>> traffic_light.is_yellow
        True
        >>> traffic_light.run('stop')
        >>> traffic_light.is_red
        True
        
        A state machine can be instantiated with an initial value:
        
        >>> machine = TrafficLightMachine(start_value='red')
        >>> traffic_light.is_red
        True
        
        
        Models
        ------
        
        If you need to persist the current state on another object, or you're using the
        state machine to control the flow of another object, you can pass this object
        to the ``StateMachine`` constructor:
        
        >>> class MyModel(object):
        ...     def __init__(self, state):
        ...         self.state = state
        ...
        >>> obj = MyModel(state='red')
        >>> traffic_light = TrafficLightMachine(obj)
        >>> traffic_light.is_red
        True
        >>> obj.state
        'red'
        >>> obj.state = 'green'
        >>> traffic_light.is_green
        True
        >>> traffic_light.slowdown()
        >>> obj.state
        'yellow'
        >>> traffic_light.is_yellow
        True
        
        
        Callbacks
        ---------
        
        Callbacks when running events:
        
        .. code-block:: python
        
            from statemachine import StateMachine, State
        
            class TrafficLightMachine(StateMachine):
                "A traffic light machine"
                green = State('Green', initial=True)
                yellow = State('Yellow')
                red = State('Red')
        
                slowdown = green.to(yellow)
                stop = yellow.to(red)
                go = red.to(green)
        
                def on_slowdown(self):
                    print('Calma, lá!')
        
                def on_stop(self):
                    print('Parou.')
        
                def on_go(self):
                    print('Valendo!')
        
        
        >>> stm = TrafficLightMachine()
        >>> stm.slowdown()
        Calma, lá!
        >>> stm.stop()
        Parou.
        >>> stm.go()
        Valendo!
        
        
        Or when entering/exiting states:
        
        .. code-block:: python
        
            from statemachine import StateMachine, State
        
            class TrafficLightMachine(StateMachine):
                "A traffic light machine"
                green = State('Green', initial=True)
                yellow = State('Yellow')
                red = State('Red')
        
                cycle = green.to(yellow) | yellow.to(red) | red.to(green)
        
                def on_enter_green(self):
                    print('Valendo!')
        
                def on_enter_yellow(self):
                    print('Calma, lá!')
        
                def on_enter_red(self):
                    print('Parou.')
        
        >>> stm = TrafficLightMachine()
        >>> stm.cycle()
        Calma, lá!
        >>> stm.cycle()
        Parou.
        >>> stm.cycle()
        Valendo!
        
        Mixins
        ------
        
        Your model can inherited from a custom mixin to auto-instantiate a state machine.
        
        .. code-block:: python
        
            class CampaignMachineWithKeys(StateMachine):
                "A workflow machine"
                draft = State('Draft', initial=True, value=1)
                producing = State('Being produced', value=2)
                closed = State('Closed', value=3)
        
                add_job = draft.to(draft) | producing.to(producing)
                produce = draft.to(producing)
                deliver = producing.to(closed)
        
        
            class MyModel(MachineMixin):
                state_machine_name = 'CampaignMachine'
        
                def __init__(self, **kwargs):
                    for k, v in kwargs.items():
                        setattr(self, k, v)
                    super(MyModel, self).__init__()
        
                def __repr__(self):
                    return "{}({!r})".format(type(self).__name__, self.__dict__)
        
        
            model = MyModel(state='draft')
            assert isinstance(model.statemachine, campaign_machine)
            assert model.state == 'draft'
            assert model.statemachine.current_state == model.statemachine.draft
        
        
        History
        =======
        
        0.7.0 (2018-04-01)
        ------------------
        
        * New event callbacks: `on_enter_<state>` and `on_exit_<state>`.
        
        0.6.2 (2017-08-25)
        ------------------
        
        * Fix README.
        
        
        0.6.1 (2017-08-25)
        ------------------
        
        * Fix deploy issues.
        
        
        0.6.0 (2017-08-25)
        ------------------
        
        * Auto-discovering `statemachine`/`statemachines` under a Django project when
          they are requested using the mixin/registry feature.
        
        0.5.1 (2017-07-24)
        ------------------
        
        * Fix bug on ``CombinedTransition._can_run`` not allowing transitions to run if there are more than
          two transitions combined.
        
        0.5.0 (2017-07-13)
        ------------------
        
        * Custom exceptions.
        * Duplicated definition of ``on_execute`` callback is not allowed.
        * Fix bug on ``StateMachine.on_<transition.identifier>`` being called with extra ``self`` param.
        
        0.4.2 (2017-07-10)
        ------------------
        
        * Python 3.6 support.
        * Drop official support for Python 3.3.
        * `Transition` can be used as decorator for `on_execute` callback definition.
        * `Transition` can point to multiple destination states.
        
        
        0.3.0 (2017-03-22)
        ------------------
        
        * README getting started section.
        * Tests to state machine without model.
        
        
        0.2.0 (2017-03-22)
        ------------------
        
        * ``State`` can hold a value that will be assigned to the model as the state value.
        * Travis-CI integration.
        * RTD integration.
        
        
        0.1.0 (2017-03-21)
        ------------------
        
        * First release on PyPI.
        
Keywords: statemachine
Platform: UNKNOWN
Classifier: Development Status :: 3 - Alpha
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: MIT License
Classifier: Natural Language :: English
Classifier: Programming Language :: Python :: 2
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.4
Classifier: Programming Language :: Python :: 3.5
Classifier: Programming Language :: Python :: 3.6
Classifier: Topic :: Software Development :: Libraries
