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2025-09-07 22:09:54 +02:00
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"""
babel.localedata
~~~~~~~~~~~~~~~~
Low-level locale data access.
:note: The `Locale` class, which uses this module under the hood, provides a
more convenient interface for accessing the locale data.
:copyright: (c) 2013-2025 by the Babel Team.
:license: BSD, see LICENSE for more details.
"""
from __future__ import annotations
import os
import pickle
import re
import sys
import threading
from collections import abc
from collections.abc import Iterator, Mapping, MutableMapping
from functools import lru_cache
from itertools import chain
from typing import Any
_cache: dict[str, Any] = {}
_cache_lock = threading.RLock()
_dirname = os.path.join(os.path.dirname(__file__), 'locale-data')
_windows_reserved_name_re = re.compile("^(con|prn|aux|nul|com[0-9]|lpt[0-9])$", re.I)
def normalize_locale(name: str) -> str | None:
"""Normalize a locale ID by stripping spaces and apply proper casing.
Returns the normalized locale ID string or `None` if the ID is not
recognized.
"""
if not name or not isinstance(name, str):
return None
name = name.strip().lower()
for locale_id in chain.from_iterable([_cache, locale_identifiers()]):
if name == locale_id.lower():
return locale_id
def resolve_locale_filename(name: os.PathLike[str] | str) -> str:
"""
Resolve a locale identifier to a `.dat` path on disk.
"""
# Clean up any possible relative paths.
name = os.path.basename(name)
# Ensure we're not left with one of the Windows reserved names.
if sys.platform == "win32" and _windows_reserved_name_re.match(os.path.splitext(name)[0]):
raise ValueError(f"Name {name} is invalid on Windows")
# Build the path.
return os.path.join(_dirname, f"{name}.dat")
def exists(name: str) -> bool:
"""Check whether locale data is available for the given locale.
Returns `True` if it exists, `False` otherwise.
:param name: the locale identifier string
"""
if not name or not isinstance(name, str):
return False
if name in _cache:
return True
file_found = os.path.exists(resolve_locale_filename(name))
return True if file_found else bool(normalize_locale(name))
@lru_cache(maxsize=None)
def locale_identifiers() -> list[str]:
"""Return a list of all locale identifiers for which locale data is
available.
This data is cached after the first invocation.
You can clear the cache by calling `locale_identifiers.cache_clear()`.
.. versionadded:: 0.8.1
:return: a list of locale identifiers (strings)
"""
return [
stem
for stem, extension in
(os.path.splitext(filename) for filename in os.listdir(_dirname))
if extension == '.dat' and stem != 'root'
]
def _is_non_likely_script(name: str) -> bool:
"""Return whether the locale is of the form ``lang_Script``,
and the script is not the likely script for the language.
This implements the behavior of the ``nonlikelyScript`` value of the
``localRules`` attribute for parent locales added in CLDR 45.
"""
from babel.core import get_global, parse_locale
try:
lang, territory, script, variant, *rest = parse_locale(name)
except ValueError:
return False
if lang and script and not territory and not variant and not rest:
likely_subtag = get_global('likely_subtags').get(lang)
_, _, likely_script, *_ = parse_locale(likely_subtag)
return script != likely_script
return False
def load(name: os.PathLike[str] | str, merge_inherited: bool = True) -> dict[str, Any]:
"""Load the locale data for the given locale.
The locale data is a dictionary that contains much of the data defined by
the Common Locale Data Repository (CLDR). This data is stored as a
collection of pickle files inside the ``babel`` package.
>>> d = load('en_US')
>>> d['languages']['sv']
u'Swedish'
Note that the results are cached, and subsequent requests for the same
locale return the same dictionary:
>>> d1 = load('en_US')
>>> d2 = load('en_US')
>>> d1 is d2
True
:param name: the locale identifier string (or "root")
:param merge_inherited: whether the inherited data should be merged into
the data of the requested locale
:raise `IOError`: if no locale data file is found for the given locale
identifier, or one of the locales it inherits from
"""
name = os.path.basename(name)
_cache_lock.acquire()
try:
data = _cache.get(name)
if not data:
# Load inherited data
if name == 'root' or not merge_inherited:
data = {}
else:
from babel.core import get_global
parent = get_global('parent_exceptions').get(name)
if not parent:
if _is_non_likely_script(name):
parent = 'root'
else:
parts = name.split('_')
parent = "root" if len(parts) == 1 else "_".join(parts[:-1])
data = load(parent).copy()
filename = resolve_locale_filename(name)
with open(filename, 'rb') as fileobj:
if name != 'root' and merge_inherited:
merge(data, pickle.load(fileobj))
else:
data = pickle.load(fileobj)
_cache[name] = data
return data
finally:
_cache_lock.release()
def merge(dict1: MutableMapping[Any, Any], dict2: Mapping[Any, Any]) -> None:
"""Merge the data from `dict2` into the `dict1` dictionary, making copies
of nested dictionaries.
>>> d = {1: 'foo', 3: 'baz'}
>>> merge(d, {1: 'Foo', 2: 'Bar'})
>>> sorted(d.items())
[(1, 'Foo'), (2, 'Bar'), (3, 'baz')]
:param dict1: the dictionary to merge into
:param dict2: the dictionary containing the data that should be merged
"""
for key, val2 in dict2.items():
if val2 is not None:
val1 = dict1.get(key)
if isinstance(val2, dict):
if val1 is None:
val1 = {}
if isinstance(val1, Alias):
val1 = (val1, val2)
elif isinstance(val1, tuple):
alias, others = val1
others = others.copy()
merge(others, val2)
val1 = (alias, others)
else:
val1 = val1.copy()
merge(val1, val2)
else:
val1 = val2
dict1[key] = val1
class Alias:
"""Representation of an alias in the locale data.
An alias is a value that refers to some other part of the locale data,
as specified by the `keys`.
"""
def __init__(self, keys: tuple[str, ...]) -> None:
self.keys = tuple(keys)
def __repr__(self) -> str:
return f"<{type(self).__name__} {self.keys!r}>"
def resolve(self, data: Mapping[str | int | None, Any]) -> Mapping[str | int | None, Any]:
"""Resolve the alias based on the given data.
This is done recursively, so if one alias resolves to a second alias,
that second alias will also be resolved.
:param data: the locale data
:type data: `dict`
"""
base = data
for key in self.keys:
data = data[key]
if isinstance(data, Alias):
data = data.resolve(base)
elif isinstance(data, tuple):
alias, others = data
data = alias.resolve(base)
return data
class LocaleDataDict(abc.MutableMapping):
"""Dictionary wrapper that automatically resolves aliases to the actual
values.
"""
def __init__(self, data: MutableMapping[str | int | None, Any], base: Mapping[str | int | None, Any] | None = None):
self._data = data
if base is None:
base = data
self.base = base
def __len__(self) -> int:
return len(self._data)
def __iter__(self) -> Iterator[str | int | None]:
return iter(self._data)
def __getitem__(self, key: str | int | None) -> Any:
orig = val = self._data[key]
if isinstance(val, Alias): # resolve an alias
val = val.resolve(self.base)
if isinstance(val, tuple): # Merge a partial dict with an alias
alias, others = val
val = alias.resolve(self.base).copy()
merge(val, others)
if isinstance(val, dict): # Return a nested alias-resolving dict
val = LocaleDataDict(val, base=self.base)
if val is not orig:
self._data[key] = val
return val
def __setitem__(self, key: str | int | None, value: Any) -> None:
self._data[key] = value
def __delitem__(self, key: str | int | None) -> None:
del self._data[key]
def copy(self) -> LocaleDataDict:
return LocaleDataDict(self._data.copy(), base=self.base)