744e33f42d
In some cases, nMigen uses type() instead of isinstance() to dispatch on types. Make sure all such uses of type() are robust; in addition, make it clear that nMigen AST classes are not meant to be subclassed. (Record is an exception.) Fixes #65.
103 lines
2.4 KiB
Python
103 lines
2.4 KiB
Python
import contextlib
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import functools
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import warnings
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from collections import OrderedDict
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from collections.abc import Iterable
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from contextlib import contextmanager
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__all__ = ["flatten", "union", "log2_int", "bits_for", "memoize", "final", "deprecated"]
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def flatten(i):
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for e in i:
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if isinstance(e, Iterable):
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yield from flatten(e)
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else:
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yield e
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def union(i, start=None):
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r = start
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for e in i:
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if r is None:
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r = e
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else:
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r |= e
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return r
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def log2_int(n, need_pow2=True):
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if n == 0:
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return 0
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r = (n - 1).bit_length()
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if need_pow2 and (1 << r) != n:
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raise ValueError("{} is not a power of 2".format(n))
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return r
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def bits_for(n, require_sign_bit=False):
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if n > 0:
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r = log2_int(n + 1, False)
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else:
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require_sign_bit = True
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r = log2_int(-n, False)
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if require_sign_bit:
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r += 1
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return r
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def memoize(f):
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memo = OrderedDict()
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@functools.wraps(f)
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def g(*args):
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if args not in memo:
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memo[args] = f(*args)
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return memo[args]
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return g
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def final(cls):
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def init_subclass():
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raise TypeError("Subclassing {}.{} is not supported"
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.format(cls.__module__, cls.__name__))
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cls.__init_subclass__ = init_subclass
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return cls
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def deprecated(message, stacklevel=2):
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def decorator(f):
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@functools.wraps(f)
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def wrapper(*args, **kwargs):
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warnings.warn(message, DeprecationWarning, stacklevel=stacklevel)
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return f(*args, **kwargs)
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return wrapper
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return decorator
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def _ignore_deprecated(f=None):
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if f is None:
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@contextlib.contextmanager
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def context_like():
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with warnings.catch_warnings():
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warnings.filterwarnings(action="ignore", category=DeprecationWarning)
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yield
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return context_like()
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else:
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@functools.wraps(f)
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def decorator_like(*args, **kwargs):
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with warnings.catch_warnings():
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warnings.filterwarnings(action="ignore", category=DeprecationWarning)
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f(*args, **kwargs)
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return decorator_like
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def extend(cls):
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def decorator(f):
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if isinstance(f, property):
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name = f.fget.__name__
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else:
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name = f.__name__
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setattr(cls, name, f)
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return decorator
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