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import inspect |
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import attr |
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from green_magic.utils import Command |
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from green_magic.utils import Subject, Observer |
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class MyDecorator(type): |
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"""Metaclass that provides a decorator able to be invoked both with and without parenthesis. |
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The wrapper function logic should be implemented by the client code. |
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""" |
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@classmethod |
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def magic_decorator(mcs, arg=None): |
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print("DEBUG magic_decorator 1, args:", str(arg)) |
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def decorator(func): |
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print("DEBUG magic_decorator 2, args:", str(func)) |
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def wrapper(*a, **ka): |
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print("DEBUG magic_decorator 3, args: [{}]".format(', '.join(str(x) for x in a))) |
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mcs._wrapper(func, *a, **ka) |
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return func(*a, **ka) |
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return wrapper |
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if callable(arg): |
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return decorator(arg) # return 'wrapper' |
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else: |
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return decorator # ... or 'decorator' |
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def _wrapper(cls, function, *args, **kwargs): |
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print('LA8OS') |
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raise NotImplementedError |
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class CommandRegistrator(MyDecorator): |
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"""Classes can use this class as metaclass to obtain a single registration point accessible as class attribute |
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""" |
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def __new__(mcs, *args, **kwargs): |
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class_object = super().__new__(mcs, *args, **kwargs) |
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class_object.state = None |
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class_object.registry = {} |
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return class_object |
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def __getitem__(self, item): |
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if item not in self.registry: |
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raise RuntimeError(f"Key '{item}' fot found in registry: [{', '.join(str(x) for x in self.registry.keys())}]") |
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return self.registry[item] |
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@attr.s |
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class CommandFactory(Subject): |
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"""A factory class able to construct new command objects.""" |
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command_constructor = attr.ib(init=True, default=Command) |
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def create(self, *args) -> Command: |
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"""Call to create a new Command object. The input arguments can be in two formats: |
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1. create(an_object, method, *arguments) |
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In this case the command is of the form an_object.method(*arguments) |
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2. create(a_function, *arguments) |
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In this case the command is of the form a_function(*arguments) |
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Returns: |
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Command: an instance of a command object |
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""" |
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is_function = hasattr(args[0], '__code__') |
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if is_function: # if receiver is a function; creating from function |
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return self.command_constructor(args[0], '__call__', *args[1:]) |
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return self.command_constructor(args[0], args[1], *args[2:]) |
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@attr.s |
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class MagicCommandFactory(Subject): |
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"""Instances of this class act as callable command factories that notify, |
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subscribed observers/listeners upon new command object creation. |
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Args: |
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command_factory (CommandFactory, optional): an instance of a CommandFActory |
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""" |
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command_factory = attr.ib(init=True, default=CommandFactory()) |
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def __call__(self, *args, **kwargs): |
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self._state = self.command_factory.create(*args) |
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self.notify() |
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return self._state |
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@attr.s |
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class CommandsAccumulator(Observer): |
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"""""" |
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commands = attr.ib(init=False, default={}) |
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def update(self, subject: Subject) -> None: |
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self.commands[getattr(subject, 'name', str(subject.state))] = subject.state |
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@attr.s |
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class CommandGetter: |
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_commands_accumulator = attr.ib(init=True, default=CommandsAccumulator()) |
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def __getattr__(self, item): |
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if item not in self._commands_accumulator.commands: |
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raise KeyError(f"Item '{item}' not found in [{', '.join(str(_) for _ in self._commands_accumulator.commands.keys())}]") |
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return self._commands_accumulator.commands[item] |
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@attr.s |
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class CommandsManager: |
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"""[summary] |
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Args: |
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prototypes (dict, optional): initial prototypes to be supplied |
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command_factory (callable, optional): a callable that returns an instance of Command |
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""" |
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_commands_getter = attr.ib(init=True, default=CommandGetter()) |
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@property |
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def command(self): |
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return self._commands_getter |
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@property |
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def commands_dict(self): |
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return self._commands_accumulator.commands |
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def __getattr__(self, item): |
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if item not in self._commands_accumulator.commands: |
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raise KeyError(f"Item '{item}' not found in [{', '.join(str(_) for _ in self._commands_accumulator.commands.keys())}]") |
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return self._commands_accumulator.commands[item] |
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boromir674 /
so-magic
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