38 lines
933 B
Python
38 lines
933 B
Python
# Copyright (c) PARRRATE T&V 2021. All rights reserved.
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from bu4.evaluation.constructs.enull import ENull
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from bu4.evaluation.av.envtype import envtype
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from bu4.linking.states.linkingstate import LinkingState
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from bu4.parsing.codes import CODE_NULL
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from bu4.parsing.constructs.linked import Linked, Parsed
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from bu4.linking.states.linkingfinished import LinkingFinished
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from bu4.evaluation.constructs.evaluable import Evaluable
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__all__ = ('PNull',)
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class LNull(Linked):
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def __init__(self):
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self.future = set()
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def link(self) -> LinkingState:
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return LinkingFinished(self)
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def evaluable(self, env: envtype) -> Evaluable:
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return ENull()
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def __str__(self):
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return '?'
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def unlink(self) -> Parsed:
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return PNull()
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class PNull(Parsed):
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def link(self, promise: set[bytes]) -> Linked:
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return LNull()
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def __bytes__(self):
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return bytes([CODE_NULL])
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