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| import _warnings | |
| import os.path | |
| # note: implementations | |
| # copied from cpython's import code | |
| # _zip_searchorder defines how we search for a module in the Zip | |
| # archive: we first search for a package __init__, then for | |
| # non-package .pyc, and .py entries. The .pyc entries | |
| # are swapped by initzipimport() if we run in optimized mode. Also, | |
| # '/' is replaced by path_sep there. | |
| _zip_searchorder = ( | |
| ("/__init__.py", True), | |
| (".py", False), | |
| ) | |
| # Replace any occurrences of '\r\n?' in the input string with '\n'. | |
| # This converts DOS and Mac line endings to Unix line endings. | |
| def _normalize_line_endings(source): | |
| source = source.replace(b"\r\n", b"\n") | |
| source = source.replace(b"\r", b"\n") | |
| return source | |
| def _resolve_name(name, package, level): | |
| """Resolve a relative module name to an absolute one.""" | |
| bits = package.rsplit(".", level - 1) | |
| if len(bits) < level: | |
| raise ValueError("attempted relative import beyond top-level package") | |
| base = bits[0] | |
| return f"{base}.{name}" if name else base | |
| def _sanity_check(name, package, level): | |
| """Verify arguments are "sane".""" | |
| if not isinstance(name, str): | |
| raise TypeError(f"module name must be str, not {type(name)}") | |
| if level < 0: | |
| raise ValueError("level must be >= 0") | |
| if level > 0: | |
| if not isinstance(package, str): | |
| raise TypeError("__package__ not set to a string") | |
| elif not package: | |
| raise ImportError("attempted relative import with no known parent package") | |
| if not name and level == 0: | |
| raise ValueError("Empty module name") | |
| def _calc___package__(globals): | |
| """Calculate what __package__ should be. | |
| __package__ is not guaranteed to be defined or could be set to None | |
| to represent that its proper value is unknown. | |
| """ | |
| package = globals.get("__package__") | |
| spec = globals.get("__spec__") | |
| if package is not None: | |
| if spec is not None and package != spec.parent: | |
| _warnings.warn( # noqa: G010 | |
| f"__package__ != __spec__.parent ({package!r} != {spec.parent!r})", # noqa: G004 | |
| ImportWarning, | |
| stacklevel=3, | |
| ) | |
| return package | |
| elif spec is not None: | |
| return spec.parent | |
| else: | |
| _warnings.warn( # noqa: G010 | |
| "can't resolve package from __spec__ or __package__, " | |
| "falling back on __name__ and __path__", | |
| ImportWarning, | |
| stacklevel=3, | |
| ) | |
| package = globals["__name__"] | |
| if "__path__" not in globals: | |
| package = package.rpartition(".")[0] | |
| return package | |
| def _normalize_path(path): | |
| """Normalize a path by ensuring it is a string. | |
| If the resulting string contains path separators, an exception is raised. | |
| """ | |
| parent, file_name = os.path.split(path) | |
| if parent: | |
| raise ValueError(f"{path!r} must be only a file name") | |
| else: | |
| return file_name | |