54 lines
1.7 KiB
Python
54 lines
1.7 KiB
Python
from bu4.codes import CODE_MAKE, CODE_NULL
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from bu4.evaluation.elambda import ELambda
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from bu4.linking.afterlinking import AfterLinking
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from bu4.linking.allambda import ALLambda
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from bu4.parsing.linked import Linked, Parsed, LinkingState
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from bu4.linking.linkingfinished import LinkingFinished
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from bu4.linking.linkingparsed import LinkingParsed
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from bu4.evaluation.aftervalue import envtype, Evaluable
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__all__ = ('LLambda', 'PLambda',)
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class LLambda(Linked):
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value: Linked
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def __init__(self, promise: set[bytes], name: bytes, value: Parsed):
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assert name not in promise, f'overloaded: {name}'
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self.promise = promise
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self.name = name
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self._value = value
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def link(self) -> LinkingState:
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return AfterLinking(LinkingParsed(self.promise | {self.name}, self._value), ALLambda(self._given_value))
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def _given_value(self, value: Linked) -> LinkingState:
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self.value = value
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self.future = self.value.future - {self.name}
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return LinkingFinished(self)
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def evaluable(self, env: envtype) -> Evaluable:
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return ELambda(
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{name: container for name, container in env.items() if name in self.future},
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self.name,
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self.value
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)
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def __str__(self):
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return f'({self.name.decode()}){self.value}'
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def unlink(self) -> Parsed:
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return PLambda(self.name, self._value)
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class PLambda(Parsed):
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def __init__(self, name: bytes, value: Parsed):
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self.name = name
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self.value = value
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def link(self, promise: set[bytes]) -> Linked:
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return LLambda(promise, self.name, self.value)
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def __bytes__(self):
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return bytes([CODE_MAKE, *self.name, CODE_NULL, *bytes(self.value)])
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