34 lines
759 B
Python
34 lines
759 B
Python
from bu4.evaluation.enull import ENull
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from bu4.codes import CODE_NULL
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from bu4.parsing.linked import Linked, LinkingState, Parsed
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from bu4.linking.linkingfinished import LinkingFinished
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from bu4.evaluation.aftervalue import envtype, Evaluable
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__all__ = ('LNull', '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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