63 lines
1.8 KiB
Python
63 lines
1.8 KiB
Python
"""Import mangling.
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See mangling.md for details.
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"""
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import re
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_mangle_index = 0
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class PackageMangler:
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"""
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Used on import, to ensure that all modules imported have a shared mangle parent.
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"""
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def __init__(self):
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global _mangle_index
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self._mangle_index = _mangle_index
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# Increment the global index
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_mangle_index += 1
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# Angle brackets are used so that there is almost no chance of
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# confusing this module for a real module. Plus, it is Python's
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# preferred way of denoting special modules.
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self._mangle_parent = f"<torch_package_{self._mangle_index}>"
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def mangle(self, name) -> str:
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assert len(name) != 0
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return self._mangle_parent + "." + name
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def demangle(self, mangled: str) -> str:
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"""
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Note: This only demangles names that were mangled by this specific
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PackageMangler. It will pass through names created by a different
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PackageMangler instance.
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"""
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if mangled.startswith(self._mangle_parent + "."):
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return mangled.partition(".")[2]
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# wasn't a mangled name
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return mangled
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def parent_name(self):
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return self._mangle_parent
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def is_mangled(name: str) -> bool:
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return bool(re.match(r"<torch_package_\d+>", name))
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def demangle(name: str) -> str:
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"""
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Note: Unlike PackageMangler.demangle, this version works on any
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mangled name, irrespective of which PackageMangler created it.
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"""
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if is_mangled(name):
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first, sep, last = name.partition(".")
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# If there is only a base mangle prefix, e.g. '<torch_package_0>',
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# then return an empty string.
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return last if len(sep) != 0 else ""
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return name
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def get_mangle_prefix(name: str) -> str:
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return name.partition(".")[0] if is_mangled(name) else name
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