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306 lines
11 KiB
Python
306 lines
11 KiB
Python
# -*- coding: utf-8 -*-
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# SPDX-License-Identifier: AGPL-3.0-or-later
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# lint: pylint
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"""Initialize :py:obj:`LOCALE_NAMES`, :py:obj:`RTL_LOCALES`.
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"""
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from typing import Set
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import os
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import pathlib
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from babel import Locale
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from babel.support import Translations
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import babel.languages
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import babel.core
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import flask_babel
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import flask
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from flask.ctx import has_request_context
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from searx import logger
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logger = logger.getChild('locales')
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# safe before monkey patching flask_babel.get_translations
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_flask_babel_get_translations = flask_babel.get_translations
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LOCALE_NAMES = {}
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"""Mapping of locales and their description. Locales e.g. 'fr' or 'pt-BR' (see
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:py:obj:`locales_initialize`).
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:meta hide-value:
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"""
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RTL_LOCALES: Set[str] = set()
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"""List of *Right-To-Left* locales e.g. 'he' or 'fa-IR' (see
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:py:obj:`locales_initialize`)."""
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ADDITIONAL_TRANSLATIONS = {
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"dv": "ދިވެހި (Dhivehi)",
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"oc": "Occitan",
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"szl": "Ślōnski (Silesian)",
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"pap": "Papiamento",
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}
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"""Additional languages SearXNG has translations for but not supported by
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python-babel (see :py:obj:`locales_initialize`)."""
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LOCALE_BEST_MATCH = {
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"dv": "si",
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"oc": 'fr-FR',
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"szl": "pl",
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"nl-BE": "nl",
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"zh-HK": "zh-Hant-TW",
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"pap": "pt-BR",
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}
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"""Map a locale we do not have a translations for to a locale we have a
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translation for. By example: use Taiwan version of the translation for Hong
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Kong."""
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def localeselector():
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locale = 'en'
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if has_request_context():
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value = flask.request.preferences.get_value('locale')
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if value:
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locale = value
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# first, set the language that is not supported by babel
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if locale in ADDITIONAL_TRANSLATIONS:
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flask.request.form['use-translation'] = locale
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# second, map locale to a value python-babel supports
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locale = LOCALE_BEST_MATCH.get(locale, locale)
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if locale == '':
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# if there is an error loading the preferences
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# the locale is going to be ''
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locale = 'en'
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# babel uses underscore instead of hyphen.
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locale = locale.replace('-', '_')
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return locale
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def get_translations():
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"""Monkey patch of :py:obj:`flask_babel.get_translations`"""
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if has_request_context():
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use_translation = flask.request.form.get('use-translation')
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if use_translation in ADDITIONAL_TRANSLATIONS:
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babel_ext = flask_babel.current_app.extensions['babel']
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return Translations.load(next(babel_ext.translation_directories), use_translation)
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return _flask_babel_get_translations()
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def get_locale_descr(locale, locale_name):
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"""Get locale name e.g. 'Français - fr' or 'Português (Brasil) - pt-BR'
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:param locale: instance of :py:class:`Locale`
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:param locale_name: name e.g. 'fr' or 'pt_BR' (delimiter is *underscore*)
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"""
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native_language, native_territory = _get_locale_descr(locale, locale_name)
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english_language, english_territory = _get_locale_descr(locale, 'en')
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if native_territory == english_territory:
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english_territory = None
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if not native_territory and not english_territory:
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if native_language == english_language:
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return native_language
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return native_language + ' (' + english_language + ')'
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result = native_language + ', ' + native_territory + ' (' + english_language
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if english_territory:
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return result + ', ' + english_territory + ')'
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return result + ')'
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def _get_locale_descr(locale, language_code):
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language_name = locale.get_language_name(language_code).capitalize()
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if language_name and ('a' <= language_name[0] <= 'z'):
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language_name = language_name.capitalize()
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terrirtory_name = locale.get_territory_name(language_code)
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return language_name, terrirtory_name
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def locales_initialize(directory=None):
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"""Initialize locales environment of the SearXNG session.
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- monkey patch :py:obj:`flask_babel.get_translations` by :py:obj:`get_translations`
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- init global names :py:obj:`LOCALE_NAMES`, :py:obj:`RTL_LOCALES`
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"""
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directory = directory or pathlib.Path(__file__).parent / 'translations'
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logger.debug("locales_initialize: %s", directory)
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flask_babel.get_translations = get_translations
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for tag, descr in ADDITIONAL_TRANSLATIONS.items():
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locale = Locale.parse(LOCALE_BEST_MATCH[tag], sep='-')
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LOCALE_NAMES[tag] = descr
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if locale.text_direction == 'rtl':
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RTL_LOCALES.add(tag)
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for tag in LOCALE_BEST_MATCH:
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descr = LOCALE_NAMES.get(tag)
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if not descr:
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locale = Locale.parse(tag, sep='-')
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LOCALE_NAMES[tag] = get_locale_descr(locale, tag.replace('-', '_'))
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if locale.text_direction == 'rtl':
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RTL_LOCALES.add(tag)
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for dirname in sorted(os.listdir(directory)):
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# Based on https://flask-babel.tkte.ch/_modules/flask_babel.html#Babel.list_translations
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if not os.path.isdir(os.path.join(directory, dirname, 'LC_MESSAGES')):
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continue
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tag = dirname.replace('_', '-')
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descr = LOCALE_NAMES.get(tag)
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if not descr:
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locale = Locale.parse(dirname)
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LOCALE_NAMES[tag] = get_locale_descr(locale, dirname)
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if locale.text_direction == 'rtl':
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RTL_LOCALES.add(tag)
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def get_engine_locale(searxng_locale, engine_locales, default=None):
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"""Return engine's language (aka locale) string that best fits to argument
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``searxng_locale``.
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Argument ``engine_locales`` is a python dict that maps *SearXNG locales* to
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corresponding *engine locales*::
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<engine>: {
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# SearXNG string : engine-string
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'ca-ES' : 'ca_ES',
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'fr-BE' : 'fr_BE',
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'fr-CA' : 'fr_CA',
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'fr-CH' : 'fr_CH',
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'fr' : 'fr_FR',
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...
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'pl-PL' : 'pl_PL',
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'pt-PT' : 'pt_PT'
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}
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.. hint::
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The *SearXNG locale* string has to be known by babel!
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If there is no direct 1:1 mapping, this functions tries to narrow down
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engine's language (locale). If no value can be determined by these
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approximation attempts the ``default`` value is returned.
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Assumptions:
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A. When user select a language the results should be optimized according to
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the selected language.
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B. When user select a language and a territory the results should be
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optimized with first priority on terrirtory and second on language.
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First approximation rule (*by territory*):
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When the user selects a locale with terrirtory (and a language), the
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territory has priority over the language. If any of the offical languages
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in the terrirtory is supported by the engine (``engine_locales``) it will
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be used.
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Second approximation rule (*by language*):
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If "First approximation rule" brings no result or the user selects only a
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language without a terrirtory. Check in which territories the language
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has an offical status and if one of these territories is supported by the
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engine.
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"""
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# pylint: disable=too-many-branches
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engine_locale = engine_locales.get(searxng_locale)
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if engine_locale is not None:
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# There was a 1:1 mapping (e.g. "fr-BE --> fr_BE" or "fr --> fr_FR"), no
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# need to narrow language nor territory.
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return engine_locale
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try:
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locale = babel.Locale.parse(searxng_locale, sep='-')
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except babel.core.UnknownLocaleError:
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try:
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locale = babel.Locale.parse(searxng_locale.split('-')[0])
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except babel.core.UnknownLocaleError:
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return default
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# SearXNG's selected locale is not supported by the engine ..
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if locale.territory:
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# Try to narrow by *offical* languages in the territory (??-XX).
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for official_language in babel.languages.get_official_languages(locale.territory, de_facto=True):
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searxng_locale = official_language + '-' + locale.territory
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engine_locale = engine_locales.get(searxng_locale)
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if engine_locale is not None:
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return engine_locale
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# Engine does not support one of the offical languages in the territory or
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# there is only a language selected without a territory.
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# Now lets have a look if the searxng_lang (the language selected by the
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# user) is a offical language in other territories. If so, check if
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# engine does support the searxng_lang in this other territory.
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if locale.language:
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searxng_lang = locale.language
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if locale.script:
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searxng_lang += '_' + locale.script
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terr_lang_dict = {}
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for territory, langs in babel.core.get_global("territory_languages").items():
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if not langs.get(searxng_lang, {}).get('official_status'):
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continue
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terr_lang_dict[territory] = langs.get(searxng_lang)
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# first: check fr-FR, de-DE .. is supported by the engine
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# exception: 'en' --> 'en-US'
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territory = locale.language.upper()
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if territory == 'EN':
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territory = 'US'
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if terr_lang_dict.get(territory):
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searxng_locale = locale.language + '-' + territory
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engine_locale = engine_locales.get(searxng_locale)
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if engine_locale is not None:
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return engine_locale
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# second: sort by population_percent and take first match
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# drawback of "population percent": if there is a terrirtory with a
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# small number of people (e.g 100) but the majority speaks the
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# language, then the percentage migth be 100% (--> 100 people) but in
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# a different terrirtory with more people (e.g. 10.000) where only 10%
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# speak the language the total amount of speaker is higher (--> 200
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# people).
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#
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# By example: The population of Saint-Martin is 33.000, of which 100%
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# speak French, but this is less than the 30% of the approximately 2.5
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# million Belgian citizens
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#
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# - 'fr-MF', 'population_percent': 100.0, 'official_status': 'official'
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# - 'fr-BE', 'population_percent': 38.0, 'official_status': 'official'
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terr_lang_list = []
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for k, v in terr_lang_dict.items():
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terr_lang_list.append((k, v))
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for territory, _lang in sorted(terr_lang_list, key=lambda item: item[1]['population_percent'], reverse=True):
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searxng_locale = locale.language + '-' + territory
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engine_locale = engine_locales.get(searxng_locale)
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if engine_locale is not None:
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return engine_locale
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# No luck: narrow by "language from territory" and "territory from language"
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# does not fit to a locale supported by the engine.
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if engine_locale is None:
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engine_locale = default
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return default
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