#  Copyright (c) PARRRATE T&V 2021. All rights reserved.

import abc

from bu4.evaluation.constructs.evaluable import Evaluable
from bu4.evaluation.constructs.evalue import EValue

__all__ = ('EVoid', 'ECoVoid',)


class EVoid(EValue, abc.ABC):
    def call(self, argument: Evaluable) -> Evaluable:
        if isinstance(argument, ECoVoid):
            return argument.call(self)
        else:
            return self


class ECoVoid(EValue):
    def void(self) -> EVoid:
        raise NotImplementedError

    def covoid(self, void: EVoid) -> Evaluable:
        raise NotImplementedError

    def call(self, argument: Evaluable) -> Evaluable:
        if isinstance(argument, EVoid):
            return self.covoid(argument)
        else:
            return self.void()