46 lines
1.6 KiB
Python
46 lines
1.6 KiB
Python
# Copyright (c) PARRRATE T&V 2021. All rights reserved.
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from bu4.evaluation.constructs.evaluable import Evaluable
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from bu4.evaluation.constructs.evalue import EValue
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from bu4.evaluation.targets.avtarget import AVTarget
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__all__ = ('AfterValue',)
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class AfterValue(Evaluable):
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def __init__(self, evaluable: Evaluable, target: AVTarget):
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self.evaluable = evaluable
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self.target = target
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def next(self) -> Evaluable:
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if isinstance(self.evaluable, EValue):
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if isinstance(self.target, AVChain):
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self.target.evaluable.evaluable = self.evaluable
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self.evaluable, self.target = self.target.evaluable.target.given(
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self.evaluable), self.target.target
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return self
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return self.target.given(self.evaluable)
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if isinstance(self.evaluable, AfterValue):
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self.evaluable, self.target = self.evaluable.evaluable, AVChain(self.evaluable, self.target)
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del self.target.evaluable.evaluable
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self.evaluable = self.evaluable.next()
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return self
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def __str__(self):
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return f'{self.evaluable}->{self.target}'
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class AVChain(AVTarget):
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def __init__(self, evaluable: AfterValue, target: AVTarget):
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if isinstance(evaluable.target, AVChain):
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raise TypeError
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self.evaluable = evaluable
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self.target = target
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def given(self, value: EValue) -> Evaluable:
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self.evaluable.evaluable = value
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return AfterValue(self.evaluable.target.given(value), self.target)
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def __str__(self):
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return f'{self.evaluable.target}->{self.target}'
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