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from __future__ import annotations
import json
import os
import gettext
from pathlib import Path
from typing import List, Dict, Any, TYPE_CHECKING
from .exceptions import TranslationError
if TYPE_CHECKING:
_: Any
class Languages:
def __init__(self):
self._mappings = self._get_language_mappings()
def _get_language_mappings(self) -> List[Dict[str, str]]:
locales_dir = Translation.get_locales_dir()
languages = Path.joinpath(locales_dir, 'languages.json')
with open(languages, 'r') as fp:
return json.load(fp)
def get_language(self, abbr: str) -> str:
for entry in self._mappings:
if entry['abbr'] == abbr:
return entry['lang']
raise ValueError(f'No language with abbrevation "{abbr}" found')
class DeferredTranslation:
def __init__(self, message: str):
self.message = message
def __len__(self) -> int:
return len(self.message)
def __str__(self) -> str:
translate = _
if translate is DeferredTranslation:
return self.message
return translate(self.message)
def __lt__(self, other) -> bool:
return self.message < other
def __gt__(self, other) -> bool:
return self.message > other
def __add__(self, other) -> DeferredTranslation:
if isinstance(other, str):
other = DeferredTranslation(other)
concat = self.message + other.message
return DeferredTranslation(concat)
def format(self, *args) -> str:
return self.message.format(*args)
@classmethod
def install(cls):
import builtins
builtins._ = cls
class Translation:
def __init__(self, locales_dir):
self._languages = {}
for name in self.get_all_names():
try:
self._languages[name] = gettext.translation('base', localedir=locales_dir, languages=[name])
except FileNotFoundError as error:
raise TranslationError(f"Could not locate language file for '{name}': {error}")
def activate(self, name):
if language := self._languages.get(name, None):
language.install()
else:
raise ValueError(f'Language not supported: {name}')
@classmethod
def load_nationalization(cls) -> Translation:
locales_dir = cls.get_locales_dir()
return Translation(locales_dir)
@classmethod
def get_locales_dir(cls) -> Path:
cur_path = Path(__file__).parent.parent
locales_dir = Path.joinpath(cur_path, 'locales')
return locales_dir
@classmethod
def get_all_names(cls) -> List[str]:
locales_dir = cls.get_locales_dir()
filenames = os.listdir(locales_dir)
def_languages = filter(lambda x: len(x) == 2, filenames)
languages = Languages()
return [languages.get_language(lang) for lang in def_languages]
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