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from typing import Any
from ._helper import remove_none
from ._error import CruException
class CruNamespaceError(CruException):
"""Raised when a namespace is not found."""
class _Cru:
NAME_PREFIXES = ("CRU_", "Cru", "cru_")
def __init__(self) -> None:
self._d: dict[str, Any] = {}
def all_names(self) -> list[str]:
return list(self._d.keys())
def get(self, name: str) -> Any:
return self._d[name]
def has_name(self, name: str) -> bool:
return name in self._d
@staticmethod
def _maybe_remove_prefix(name: str) -> str | None:
for prefix in _Cru.NAME_PREFIXES:
if name.startswith(prefix):
return name[len(prefix) :]
return None
def _check_name_exist(self, *names: str | None) -> None:
for name in names:
if name is None:
continue
if self.has_name(name):
raise CruNamespaceError(f"Name {name} exists in CRU.")
@staticmethod
def check_name_format(name: str) -> tuple[str, str]:
no_prefix_name = _Cru._maybe_remove_prefix(name)
if no_prefix_name is None:
raise CruNamespaceError(
f"Name {name} is not prefixed with any of {_Cru.NAME_PREFIXES}."
)
return name, no_prefix_name
@staticmethod
def _check_object_name(o) -> tuple[str, str]:
return _Cru.check_name_format(o.__name__)
def _do_add(self, o, *names: str | None) -> list[str]:
name_list: list[str] = remove_none(names)
for name in name_list:
self._d[name] = o
return name_list
def add(self, o, name: str | None) -> tuple[str, str | None]:
no_prefix_name: str | None
if name is None:
name, no_prefix_name = self._check_object_name(o)
else:
no_prefix_name = self._maybe_remove_prefix(name)
self._check_name_exist(name, no_prefix_name)
self._do_add(o, name, no_prefix_name)
return name, no_prefix_name
def add_with_alias(self, o, name: str | None = None, *aliases: str) -> list[str]:
final_names: list[str | None] = []
no_prefix_name: str | None
if name is None:
name, no_prefix_name = self._check_object_name(o)
self._check_name_exist(name, no_prefix_name)
final_names.extend([name, no_prefix_name])
for alias in aliases:
no_prefix_name = self._maybe_remove_prefix(alias)
self._check_name_exist(alias, no_prefix_name)
final_names.extend([alias, no_prefix_name])
return self._do_add(o, *final_names)
def add_objects(self, *objects):
final_list = []
for o in objects:
name, no_prefix_name = self._check_object_name(o)
self._check_name_exist(name, no_prefix_name)
final_list.append((o, name, no_prefix_name))
for o, name, no_prefix_name in final_list:
self._do_add(o, name, no_prefix_name)
def __getitem__(self, item):
return self.get(item)
def __getattr__(self, item):
return self.get(item)
CRU_NAME_PREFIXES = _Cru.NAME_PREFIXES
CRU = _Cru()
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