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hdl.ast: formatting. NFC.

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whitequark 2020-12-12 14:11:40 +00:00
parent 818c8bc464
commit 7dde2aac7c
1 changed files with 8 additions and 7 deletions
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15
nmigen/hdl/ast.py
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@ -1290,19 +1290,20 @@ class ValueCastable:
Note that it is necessary to ensure that nMigen's view of representation of all values stays
internally consistent. The class deriving from ``ValueCastable`` must decorate the ``as_value``
method with the ``lowermethod`` decorator, which ensures that all calls to ``as_value``return the
same ``Value`` representation. If the class deriving from ``ValueCastable`` is mutable, it is
up to the user to ensure that it is not mutated in a way that changes its representation after
the first call to ``as_value``.
method with the ``lowermethod`` decorator, which ensures that all calls to ``as_value`` return
the same ``Value`` representation. If the class deriving from ``ValueCastable`` is mutable,
it is up to the user to ensure that it is not mutated in a way that changes its representation
after the first call to ``as_value``.
"""
def __new__(cls, *args, **kwargs):
self = super().__new__(cls)
if not hasattr(self, "as_value"):
raise TypeError(f"Class '{cls.__name__}' deriving from `ValueCastable` must override the `as_value` method")
raise TypeError(f"Class '{cls.__name__}' deriving from `ValueCastable` must override "
"the `as_value` method")
if not hasattr(self.as_value, "_ValueCastable__memoized"):
raise TypeError(f"Class '{cls.__name__}' deriving from `ValueCastable` must decorate the `as_value` "
"method with the `ValueCastable.lowermethod` decorator")
raise TypeError(f"Class '{cls.__name__}' deriving from `ValueCastable` must decorate "
"the `as_value` method with the `ValueCastable.lowermethod` decorator")
return self
@staticmethod