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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 '{}.{}'.format(base, name) if name else base
def _sanity_check(name, package, level):
"""Verify arguments are "sane"."""
if not isinstance(name, str):
raise TypeError('module name must be str, not {}'.format(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("__package__ != __spec__.parent "
f"({package!r} != {spec.parent!r})",
ImportWarning, stacklevel=3)
return package
elif spec is not None:
return spec.parent
else:
_warnings.warn("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('{!r} must be only a file name'.format(path))
else:
return file_name
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