37 lines
1.1 KiB
Python
37 lines
1.1 KiB
Python
# Copyright (c) PARRRATE T&V 2021. All rights reserved.
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from typing import Mapping, Iterator
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from bu4.evaluation.constructs.evaluable import Evaluable
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from bu4.evaluation.targets.avnamedcontainer import AVNamedContainer
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from bu4.linkable.evaluation.elvtype import elvtype
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__all__ = ('LambdaElv',)
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class LambdaElv(Mapping[bytes, Evaluable]):
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def __getitem__(self, k: bytes) -> Evaluable:
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if k == self.name:
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return self.container
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else:
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return self.env[k]
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def __len__(self) -> int:
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return len(self.env) + 1
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def __iter__(self) -> Iterator[Evaluable]:
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yield self.name
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yield from self.env
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def __init__(self, env: elvtype, name: bytes, evaluable: Evaluable, *, memoize):
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self.env = env
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self.name = name
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self.container = AVNamedContainer(evaluable, name).after_value if memoize else evaluable
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@staticmethod
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def strfy(self):
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return ''.join(f'\x7b{evaluable}|{name.decode()}\x7d' for name, evaluable in self.items())
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def __str__(self):
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return self.strfy(self)
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