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83 lines
1.9 KiB
Python
83 lines
1.9 KiB
Python
from typing import TypeVar, Optional, TYPE_CHECKING
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from abc import ABCMeta, abstractmethod
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from ..error import PatternError
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if TYPE_CHECKING:
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from ..repetition import Repetition
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T = TypeVar('T', bound='Repeatable')
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I = TypeVar('I', bound='RepeatableImpl')
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class Repeatable(metaclass=ABCMeta):
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"""
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Abstract class for all repeatable entities
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"""
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__slots__ = ()
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'''
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---- Properties
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'''
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@property
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@abstractmethod
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def repetition(self) -> Optional['Repetition']:
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"""
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Repetition object, or None (single instance only)
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"""
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pass
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# @repetition.setter
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# @abstractmethod
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# def repetition(self, repetition: Optional['Repetition']):
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# pass
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'''
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---- Methods
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'''
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@abstractmethod
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def set_repetition(self: T, repetition: Optional['Repetition']) -> T:
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"""
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Set the repetition
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Args:
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repetition: new value for repetition, or None (single instance)
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Returns:
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self
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"""
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pass
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class RepeatableImpl(Repeatable, metaclass=ABCMeta):
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"""
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Simple implementation of `Repeatable`
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"""
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__slots__ = ()
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_repetition: Optional['Repetition']
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""" Repetition object, or None (single instance only) """
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'''
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---- Non-abstract properties
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'''
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@property
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def repetition(self) -> Optional['Repetition']:
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return self._repetition
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@repetition.setter
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def repetition(self, repetition: Optional['Repetition']):
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from ..repetition import Repetition
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if repetition is not None and not isinstance(repetition, Repetition):
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raise PatternError(f'{repetition} is not a valid Repetition object!')
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self._repetition = repetition
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'''
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---- Non-abstract methods
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'''
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def set_repetition(self: I, repetition: Optional['Repetition']) -> I:
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self.repetition = repetition
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return self
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