forked from zaclys/searxng
98 lines
4.2 KiB
Python
98 lines
4.2 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
|
|
# lint: pylint
|
|
"""Plugin to detect the search language from the search query.
|
|
|
|
The language detection is done by using the fastText_ library (`python
|
|
fasttext`_). fastText_ distributes the `language identification model`_, for
|
|
reference:
|
|
|
|
- `FastText.zip: Compressing text classification models`_
|
|
- `Bag of Tricks for Efficient Text Classification`_
|
|
|
|
The `language identification model`_ support the language codes (ISO-639-3)::
|
|
|
|
af als am an ar arz as ast av az azb ba bar bcl be bg bh bn bo bpy br bs bxr
|
|
ca cbk ce ceb ckb co cs cv cy da de diq dsb dty dv el eml en eo es et eu fa
|
|
fi fr frr fy ga gd gl gn gom gu gv he hi hif hr hsb ht hu hy ia id ie ilo io
|
|
is it ja jbo jv ka kk km kn ko krc ku kv kw ky la lb lez li lmo lo lrc lt lv
|
|
mai mg mhr min mk ml mn mr mrj ms mt mwl my myv mzn nah nap nds ne new nl nn
|
|
no oc or os pa pam pfl pl pms pnb ps pt qu rm ro ru rue sa sah sc scn sco sd
|
|
sh si sk sl so sq sr su sv sw ta te tg th tk tl tr tt tyv ug uk ur uz vec vep
|
|
vi vls vo wa war wuu xal xmf yi yo yue zh
|
|
|
|
The `language identification model`_ is harmonized with the SearXNG's language
|
|
(locale) model. General conditions of SearXNG's locale model are:
|
|
|
|
a. SearXNG's locale of a query is passed to the
|
|
:py:obj:`searx.locales.get_engine_locale` to get a language and/or region
|
|
code that is used by an engine.
|
|
|
|
b. SearXNG and most of the engines do not support all the languages from
|
|
language model and there might be also a discrepancy in the ISO-639-3 and
|
|
ISO-639-2 handling (:py:obj:`searx.locales.get_engine_locale`). Further
|
|
more, in SearXNG the locales like ``zh-TH`` (``zh-CN``) are mapped to
|
|
``zh_Hant`` (``zh_Hans``).
|
|
|
|
Conclusion: This plugin does only auto-detect the languages a user can select in
|
|
the language menu (:py:obj:`supported_langs`).
|
|
|
|
SearXNG's locale of a query comes from (*highest wins*):
|
|
|
|
1. The ``Accept-Language`` header from user's HTTP client.
|
|
2. The user select a locale in the preferences.
|
|
3. The user select a locale from the menu in the query form (e.g. ``:zh-TW``)
|
|
4. This plugin is activated in the preferences and the locale (only the language
|
|
code / none region code) comes from the fastText's language detection.
|
|
|
|
Conclusion: There is a conflict between the language selected by the user and
|
|
the language from language detection of this plugin. For example, the user
|
|
explicitly selects the German locale via the search syntax to search for a term
|
|
that is identified as an English term (try ``:de-DE thermomix``, for example).
|
|
|
|
.. hint::
|
|
|
|
To SearXNG maintainers; please take into account: under some circumstances
|
|
the auto-detection of the language of this plugin could be detrimental to
|
|
users expectations. Its not recommended to activate this plugin by
|
|
default. It should always be the user's decision whether to activate this
|
|
plugin or not.
|
|
|
|
.. _fastText: https://fasttext.cc/
|
|
.. _python fasttext: https://pypi.org/project/fasttext/
|
|
.. _language identification model: https://fasttext.cc/docs/en/language-identification.html
|
|
.. _Bag of Tricks for Efficient Text Classification: https://arxiv.org/abs/1607.01759
|
|
.. _`FastText.zip: Compressing text classification models`: https://arxiv.org/abs/1612.03651
|
|
|
|
"""
|
|
|
|
from flask_babel import gettext
|
|
import babel
|
|
|
|
from searx.utils import detect_language
|
|
from searx.languages import language_codes
|
|
|
|
name = gettext('Autodetect search language')
|
|
description = gettext('Automatically detect the query search language and switch to it.')
|
|
preference_section = 'general'
|
|
default_on = False
|
|
|
|
supported_langs = set()
|
|
"""Languages supported by most searxng engines (:py:obj:`searx.languages.language_codes`)."""
|
|
|
|
|
|
def pre_search(request, search): # pylint: disable=unused-argument
|
|
lang = detect_language(search.search_query.query, min_probability=0)
|
|
if lang in supported_langs:
|
|
search.search_query.lang = lang
|
|
try:
|
|
search.search_query.locale = babel.Locale.parse(lang)
|
|
except babel.core.UnknownLocaleError:
|
|
pass
|
|
return True
|
|
|
|
|
|
def init(app, settings): # pylint: disable=unused-argument
|
|
for searxng_locale in language_codes:
|
|
supported_langs.add(searxng_locale[0].split('-')[0])
|
|
return True
|