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51 lines
1.4 KiB
51 lines
1.4 KiB
3 years ago
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from copy import deepcopy
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__all__ = ['get_img_extensions', 'is_img_extension', 'set_img_extensions', 'add_img_extensions', 'del_img_extensions']
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IMG_EXTENSIONS = ('.png', '.jpg', '.jpeg') # singleton, kept public for bwd compat use
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_IMG_EXTENSIONS_SET = set(IMG_EXTENSIONS) # set version, private, kept in sync
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def _set_extensions(extensions):
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global IMG_EXTENSIONS
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global _IMG_EXTENSIONS_SET
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dedupe = set() # NOTE de-duping tuple while keeping original order
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IMG_EXTENSIONS = tuple(x for x in extensions if x not in dedupe and not dedupe.add(x))
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_IMG_EXTENSIONS_SET = set(extensions)
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def _valid_extension(x: str):
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return x and isinstance(x, str) and len(x) >= 2 and x.startswith('.')
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def is_img_extension(ext):
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return ext in _IMG_EXTENSIONS_SET
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def get_img_extensions(as_set=False):
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return deepcopy(_IMG_EXTENSIONS_SET if as_set else IMG_EXTENSIONS)
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def set_img_extensions(extensions):
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assert len(extensions)
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for x in extensions:
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assert _valid_extension(x)
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_set_extensions(extensions)
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def add_img_extensions(ext):
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if not isinstance(ext, (list, tuple, set)):
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ext = (ext,)
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for x in ext:
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assert _valid_extension(x)
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extensions = IMG_EXTENSIONS + tuple(ext)
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_set_extensions(extensions)
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def del_img_extensions(ext):
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if not isinstance(ext, (list, tuple, set)):
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ext = (ext,)
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extensions = tuple(x for x in IMG_EXTENSIONS if x not in ext)
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_set_extensions(extensions)
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