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- # mypy: allow-untyped-defs
- """Import mangling.
- See mangling.md for details.
- """
- import re
- _mangle_index = 0
- class PackageMangler:
- """
- Used on import, to ensure that all modules imported have a shared mangle parent.
- """
- def __init__(self) -> None:
- global _mangle_index
- self._mangle_index = _mangle_index
- # Increment the global index
- _mangle_index += 1
- # Angle brackets are used so that there is almost no chance of
- # confusing this module for a real module. Plus, it is Python's
- # preferred way of denoting special modules.
- self._mangle_parent = f"<torch_package_{self._mangle_index}>"
- def mangle(self, name) -> str:
- if len(name) == 0:
- raise AssertionError("name must not be empty")
- return self._mangle_parent + "." + name
- def demangle(self, mangled: str) -> str:
- """
- Note: This only demangles names that were mangled by this specific
- PackageMangler. It will pass through names created by a different
- PackageMangler instance.
- """
- if mangled.startswith(self._mangle_parent + "."):
- return mangled.partition(".")[2]
- # wasn't a mangled name
- return mangled
- def parent_name(self):
- return self._mangle_parent
- def is_mangled(name: str) -> bool:
- return bool(re.match(r"<torch_package_\d+>", name))
- def demangle(name: str) -> str:
- """
- Note: Unlike PackageMangler.demangle, this version works on any
- mangled name, irrespective of which PackageMangler created it.
- """
- if is_mangled(name):
- _first, sep, last = name.partition(".")
- # If there is only a base mangle prefix, e.g. '<torch_package_0>',
- # then return an empty string.
- return last if len(sep) != 0 else ""
- return name
- def get_mangle_prefix(name: str) -> str:
- return name.partition(".")[0] if is_mangled(name) else name
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