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"""Contains all logic related to placing an import within a certain section."""
import importlib
from fnmatch import fnmatch
from functools import lru_cache
from pathlib import Path
from typing import FrozenSet, Iterable, Optional, Tuple
from isort import sections
from isort.settings import DEFAULT_CONFIG, Config
from isort.utils import exists_case_sensitive
LOCAL = "LOCALFOLDER"
def module(name: str, config: Config = DEFAULT_CONFIG) -> str:
"""Returns the section placement for the given module name."""
return module_with_reason(name, config)[0]
@lru_cache(maxsize=1000)
def module_with_reason(name: str, config: Config = DEFAULT_CONFIG) -> Tuple[str, str]:
"""Returns the section placement for the given module name alongside the reasoning."""
return (
_forced_separate(name, config)
or _local(name, config)
or _known_pattern(name, config)
or _src_path(name, config)
or (config.default_section, "Default option in Config or universal default.")
)
def _forced_separate(name: str, config: Config) -> Optional[Tuple[str, str]]:
for forced_separate in config.forced_separate:
# Ensure all forced_separate patterns will match to end of string
path_glob = forced_separate
if not forced_separate.endswith("*"):
path_glob = f"{forced_separate}*"
if fnmatch(name, path_glob) or fnmatch(name, "." + path_glob):
return (forced_separate, f"Matched forced_separate ({forced_separate}) config value.")
return None
def _local(name: str, config: Config) -> Optional[Tuple[str, str]]:
if name.startswith("."):
return (LOCAL, "Module name started with a dot.")
return None
def _known_pattern(name: str, config: Config) -> Optional[Tuple[str, str]]:
parts = name.split(".")
module_names_to_check = (".".join(parts[:first_k]) for first_k in range(len(parts), 0, -1))
for module_name_to_check in module_names_to_check:
for pattern, placement in config.known_patterns:
if placement in config.sections and pattern.match(module_name_to_check):
return (placement, f"Matched configured known pattern {pattern}")
return None
def _src_path(
name: str,
config: Config,
src_paths: Optional[Iterable[Path]] = None,
prefix: Tuple[str, ...] = (),
) -> Optional[Tuple[str, str]]:
if src_paths is None:
src_paths = config.src_paths
root_module_name, *nested_module = name.split(".", 1)
new_prefix = prefix + (root_module_name,)
namespace = ".".join(new_prefix)
for src_path in src_paths:
module_path = (src_path / root_module_name).resolve()
if not prefix and not module_path.is_dir() and src_path.name == root_module_name:
module_path = src_path.resolve()
if nested_module and (
namespace in config.namespace_packages
or (
config.auto_identify_namespace_packages
and _is_namespace_package(module_path, config.supported_extensions)
)
):
return _src_path(nested_module[0], config, (module_path,), new_prefix)
if (
_is_module(module_path)
or _is_package(module_path)
or _src_path_is_module(src_path, root_module_name)
):
return (sections.FIRSTPARTY, f"Found in one of the configured src_paths: {src_path}.")
return None
def _is_module(path: Path) -> bool:
return (
exists_case_sensitive(str(path.with_suffix(".py")))
or any(
exists_case_sensitive(str(path.with_suffix(ext_suffix)))
for ext_suffix in importlib.machinery.EXTENSION_SUFFIXES
)
or exists_case_sensitive(str(path / "__init__.py"))
)
def _is_package(path: Path) -> bool:
return exists_case_sensitive(str(path)) and path.is_dir()
def _is_namespace_package(path: Path, src_extensions: FrozenSet[str]) -> bool:
if not _is_package(path):
return False
init_file = path / "__init__.py"
if not init_file.exists():
filenames = [
filepath
for filepath in path.iterdir()
if filepath.suffix.lstrip(".") in src_extensions
or filepath.name.lower() in ("setup.cfg", "pyproject.toml")
]
if filenames:
return False
else:
with init_file.open("rb") as open_init_file:
file_start = open_init_file.read(4096)
if (
b"__import__('pkg_resources').declare_namespace(__name__)" not in file_start
and b'__import__("pkg_resources").declare_namespace(__name__)' not in file_start
and b"__path__ = __import__('pkgutil').extend_path(__path__, __name__)"
not in file_start
and b'__path__ = __import__("pkgutil").extend_path(__path__, __name__)'
not in file_start
):
return False
return True
def _src_path_is_module(src_path: Path, module_name: str) -> bool:
return (
module_name == src_path.name and src_path.is_dir() and exists_case_sensitive(str(src_path))
)