cache base64encode calls since it's actually fairly slow
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@ -24,6 +24,7 @@ import copy
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from pprint import pformat
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from collections import defaultdict
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from abc import ABCMeta, abstractmethod
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from functools import lru_cache
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import numpy
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from numpy.typing import ArrayLike, NDArray
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@ -351,9 +352,7 @@ class ILibraryView(Mapping[str, 'Pattern'], metaclass=ABCMeta):
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ii = 0
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suffixed_name = sanitized_name
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while suffixed_name in self or suffixed_name == '':
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suffix = base64.b64encode(struct.pack('>Q', ii), altchars=b'$?').decode('ASCII')
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suffixed_name = sanitized_name + '$' + suffix[:-1].lstrip('A')
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suffixed_name = sanitized_name + b64suffix(ii)
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ii += 1
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if len(suffixed_name) > max_length:
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@ -1231,3 +1230,10 @@ class AbstractView(Mapping[str, Abstract]):
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def __len__(self) -> int:
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return self.library.__len__()
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@lru_cache(maxsize=8_000)
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def b64suffix(ii: int) -> str:
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"""Turn an integer into a base64-equivalent suffix."""
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suffix = base64.b64encode(struct.pack('>Q', ii), altchars=b'$?').decode('ASCII')
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return '$' + suffix[:-1].lstrip('A')
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