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<h1>Source code for searx.locales</h1><div class="highlight"><pre>
<span></span><span class="c1"># SPDX-License-Identifier: AGPL-3.0-or-later</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd">SearXNG’s locale data</span>
<span class="sd">=====================</span>
<span class="sd">The variables :py:obj:`RTL_LOCALES` and :py:obj:`LOCALE_NAMES` are loaded from</span>
<span class="sd">:origin:`searx/data/locales.json` / see :py:obj:`locales_initialize` and</span>
<span class="sd">:ref:`update_locales.py`.</span>
<span class="sd">.. hint::</span>
<span class="sd"> Whenever the value of :py:obj:`ADDITIONAL_TRANSLATIONS` or</span>
<span class="sd"> :py:obj:`LOCALE_BEST_MATCH` is modified, the</span>
<span class="sd"> :origin:`searx/data/locales.json` needs to be rebuild::</span>
<span class="sd"> ./manage data.locales</span>
<span class="sd">SearXNG&#39;s locale codes</span>
<span class="sd">======================</span>
<span class="sd">.. automodule:: searx.sxng_locales</span>
<span class="sd"> :members:</span>
<span class="sd">SearXNG’s locale implementations</span>
<span class="sd">================================</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="kn">from</span> <span class="nn">__future__</span> <span class="kn">import</span> <span class="n">annotations</span>
<span class="kn">from</span> <span class="nn">pathlib</span> <span class="kn">import</span> <span class="n">Path</span>
<span class="kn">import</span> <span class="nn">babel</span>
<span class="kn">from</span> <span class="nn">babel.support</span> <span class="kn">import</span> <span class="n">Translations</span>
<span class="kn">import</span> <span class="nn">babel.languages</span>
<span class="kn">import</span> <span class="nn">babel.core</span>
<span class="kn">import</span> <span class="nn">flask_babel</span>
<span class="kn">import</span> <span class="nn">flask</span>
<span class="kn">from</span> <span class="nn">flask.ctx</span> <span class="kn">import</span> <span class="n">has_request_context</span>
<span class="kn">from</span> <span class="nn">searx</span> <span class="kn">import</span> <span class="p">(</span>
<span class="n">data</span><span class="p">,</span>
<span class="n">logger</span><span class="p">,</span>
<span class="n">searx_dir</span><span class="p">,</span>
<span class="p">)</span>
<span class="n">logger</span> <span class="o">=</span> <span class="n">logger</span><span class="o">.</span><span class="n">getChild</span><span class="p">(</span><span class="s1">&#39;locales&#39;</span><span class="p">)</span>
<span class="c1"># safe before monkey patching flask_babel.get_translations</span>
<span class="n">_flask_babel_get_translations</span> <span class="o">=</span> <span class="n">flask_babel</span><span class="o">.</span><span class="n">get_translations</span>
<span class="n">LOCALE_NAMES</span> <span class="o">=</span> <span class="p">{}</span>
<span class="sd">&quot;&quot;&quot;Mapping of locales and their description. Locales e.g. &#39;fr&#39; or &#39;pt-BR&#39; (see</span>
<span class="sd">:py:obj:`locales_initialize`).</span>
<span class="sd">:meta hide-value:</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="n">RTL_LOCALES</span><span class="p">:</span> <span class="nb">set</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
<span class="sd">&quot;&quot;&quot;List of *Right-To-Left* locales e.g. &#39;he&#39; or &#39;fa-IR&#39; (see</span>
<span class="sd">:py:obj:`locales_initialize`).&quot;&quot;&quot;</span>
<span class="n">ADDITIONAL_TRANSLATIONS</span> <span class="o">=</span> <span class="p">{</span>
<span class="s2">&quot;dv&quot;</span><span class="p">:</span> <span class="s2">&quot;ދިވެހި (Dhivehi)&quot;</span><span class="p">,</span>
<span class="s2">&quot;oc&quot;</span><span class="p">:</span> <span class="s2">&quot;Occitan&quot;</span><span class="p">,</span>
<span class="s2">&quot;szl&quot;</span><span class="p">:</span> <span class="s2">&quot;Ślōnski (Silesian)&quot;</span><span class="p">,</span>
<span class="s2">&quot;pap&quot;</span><span class="p">:</span> <span class="s2">&quot;Papiamento&quot;</span><span class="p">,</span>
<span class="p">}</span>
<span class="sd">&quot;&quot;&quot;Additional languages SearXNG has translations for but not supported by</span>
<span class="sd">python-babel (see :py:obj:`locales_initialize`).&quot;&quot;&quot;</span>
<span class="n">LOCALE_BEST_MATCH</span> <span class="o">=</span> <span class="p">{</span>
<span class="s2">&quot;dv&quot;</span><span class="p">:</span> <span class="s2">&quot;si&quot;</span><span class="p">,</span>
<span class="s2">&quot;oc&quot;</span><span class="p">:</span> <span class="s1">&#39;fr-FR&#39;</span><span class="p">,</span>
<span class="s2">&quot;szl&quot;</span><span class="p">:</span> <span class="s2">&quot;pl&quot;</span><span class="p">,</span>
<span class="s2">&quot;nl-BE&quot;</span><span class="p">:</span> <span class="s2">&quot;nl&quot;</span><span class="p">,</span>
<span class="s2">&quot;zh-HK&quot;</span><span class="p">:</span> <span class="s2">&quot;zh-Hant-TW&quot;</span><span class="p">,</span>
<span class="s2">&quot;pap&quot;</span><span class="p">:</span> <span class="s2">&quot;pt-BR&quot;</span><span class="p">,</span>
<span class="p">}</span>
<span class="sd">&quot;&quot;&quot;Map a locale we do not have a translations for to a locale we have a</span>
<span class="sd">translation for. By example: use Taiwan version of the translation for Hong</span>
<span class="sd">Kong.&quot;&quot;&quot;</span>
<span class="k">def</span> <span class="nf">localeselector</span><span class="p">():</span>
<span class="n">locale</span> <span class="o">=</span> <span class="s1">&#39;en&#39;</span>
<span class="k">if</span> <span class="n">has_request_context</span><span class="p">():</span>
<span class="n">value</span> <span class="o">=</span> <span class="n">flask</span><span class="o">.</span><span class="n">request</span><span class="o">.</span><span class="n">preferences</span><span class="o">.</span><span class="n">get_value</span><span class="p">(</span><span class="s1">&#39;locale&#39;</span><span class="p">)</span>
<span class="k">if</span> <span class="n">value</span><span class="p">:</span>
<span class="n">locale</span> <span class="o">=</span> <span class="n">value</span>
<span class="c1"># first, set the language that is not supported by babel</span>
<span class="k">if</span> <span class="n">locale</span> <span class="ow">in</span> <span class="n">ADDITIONAL_TRANSLATIONS</span><span class="p">:</span>
<span class="n">flask</span><span class="o">.</span><span class="n">request</span><span class="o">.</span><span class="n">form</span><span class="p">[</span><span class="s1">&#39;use-translation&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">locale</span>
<span class="c1"># second, map locale to a value python-babel supports</span>
<span class="n">locale</span> <span class="o">=</span> <span class="n">LOCALE_BEST_MATCH</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">locale</span><span class="p">,</span> <span class="n">locale</span><span class="p">)</span>
<span class="k">if</span> <span class="n">locale</span> <span class="o">==</span> <span class="s1">&#39;&#39;</span><span class="p">:</span>
<span class="c1"># if there is an error loading the preferences</span>
<span class="c1"># the locale is going to be &#39;&#39;</span>
<span class="n">locale</span> <span class="o">=</span> <span class="s1">&#39;en&#39;</span>
<span class="c1"># babel uses underscore instead of hyphen.</span>
<span class="n">locale</span> <span class="o">=</span> <span class="n">locale</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="s1">&#39;-&#39;</span><span class="p">,</span> <span class="s1">&#39;_&#39;</span><span class="p">)</span>
<span class="k">return</span> <span class="n">locale</span>
<div class="viewcode-block" id="get_translations">
<a class="viewcode-back" href="../../src/searx.locales.html#searx.locales.get_translations">[docs]</a>
<span class="k">def</span> <span class="nf">get_translations</span><span class="p">():</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;Monkey patch of :py:obj:`flask_babel.get_translations`&quot;&quot;&quot;</span>
<span class="k">if</span> <span class="n">has_request_context</span><span class="p">():</span>
<span class="n">use_translation</span> <span class="o">=</span> <span class="n">flask</span><span class="o">.</span><span class="n">request</span><span class="o">.</span><span class="n">form</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;use-translation&#39;</span><span class="p">)</span>
<span class="k">if</span> <span class="n">use_translation</span> <span class="ow">in</span> <span class="n">ADDITIONAL_TRANSLATIONS</span><span class="p">:</span>
<span class="n">babel_ext</span> <span class="o">=</span> <span class="n">flask_babel</span><span class="o">.</span><span class="n">current_app</span><span class="o">.</span><span class="n">extensions</span><span class="p">[</span><span class="s1">&#39;babel&#39;</span><span class="p">]</span>
<span class="k">return</span> <span class="n">Translations</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">babel_ext</span><span class="o">.</span><span class="n">translation_directories</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="n">use_translation</span><span class="p">)</span>
<span class="k">return</span> <span class="n">_flask_babel_get_translations</span><span class="p">()</span></div>
<span class="n">_TR_LOCALES</span><span class="p">:</span> <span class="nb">list</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="p">[]</span>
<div class="viewcode-block" id="get_translation_locales">
<a class="viewcode-back" href="../../src/searx.locales.html#searx.locales.get_translation_locales">[docs]</a>
<span class="k">def</span> <span class="nf">get_translation_locales</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="nb">list</span><span class="p">[</span><span class="nb">str</span><span class="p">]:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;Returns the list of transaltion locales (*underscore*). The list is</span>
<span class="sd"> generated from the translation folders in :origin:`searx/translations`&quot;&quot;&quot;</span>
<span class="k">global</span> <span class="n">_TR_LOCALES</span> <span class="c1"># pylint:disable=global-statement</span>
<span class="k">if</span> <span class="n">_TR_LOCALES</span><span class="p">:</span>
<span class="k">return</span> <span class="n">_TR_LOCALES</span>
<span class="n">tr_locales</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="n">folder</span> <span class="ow">in</span> <span class="p">(</span><span class="n">Path</span><span class="p">(</span><span class="n">searx_dir</span><span class="p">)</span> <span class="o">/</span> <span class="s1">&#39;translations&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">iterdir</span><span class="p">():</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">folder</span><span class="o">.</span><span class="n">is_dir</span><span class="p">():</span>
<span class="k">continue</span>
<span class="k">if</span> <span class="ow">not</span> <span class="p">(</span><span class="n">folder</span> <span class="o">/</span> <span class="s1">&#39;LC_MESSAGES&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">is_dir</span><span class="p">():</span>
<span class="k">continue</span>
<span class="n">tr_locales</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">folder</span><span class="o">.</span><span class="n">name</span><span class="p">)</span>
<span class="n">_TR_LOCALES</span> <span class="o">=</span> <span class="nb">sorted</span><span class="p">(</span><span class="n">tr_locales</span><span class="p">)</span>
<span class="k">return</span> <span class="n">_TR_LOCALES</span></div>
<div class="viewcode-block" id="locales_initialize">
<a class="viewcode-back" href="../../src/searx.locales.html#searx.locales.locales_initialize">[docs]</a>
<span class="k">def</span> <span class="nf">locales_initialize</span><span class="p">():</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;Initialize locales environment of the SearXNG session.</span>
<span class="sd"> - monkey patch :py:obj:`flask_babel.get_translations` by :py:obj:`get_translations`</span>
<span class="sd"> - init global names :py:obj:`LOCALE_NAMES`, :py:obj:`RTL_LOCALES`</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">flask_babel</span><span class="o">.</span><span class="n">get_translations</span> <span class="o">=</span> <span class="n">get_translations</span>
<span class="n">LOCALE_NAMES</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">data</span><span class="o">.</span><span class="n">LOCALES</span><span class="p">[</span><span class="s2">&quot;LOCALE_NAMES&quot;</span><span class="p">])</span>
<span class="n">RTL_LOCALES</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">data</span><span class="o">.</span><span class="n">LOCALES</span><span class="p">[</span><span class="s2">&quot;RTL_LOCALES&quot;</span><span class="p">])</span></div>
<div class="viewcode-block" id="region_tag">
<a class="viewcode-back" href="../../src/searx.locales.html#searx.locales.region_tag">[docs]</a>
<span class="k">def</span> <span class="nf">region_tag</span><span class="p">(</span><span class="n">locale</span><span class="p">:</span> <span class="n">babel</span><span class="o">.</span><span class="n">Locale</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;Returns SearXNG&#39;s region tag from the locale (e.g. zh-TW , en-US).&quot;&quot;&quot;</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">locale</span><span class="o">.</span><span class="n">territory</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">&#39;</span><span class="si">%s</span><span class="s1"> missed a territory&#39;</span><span class="p">)</span>
<span class="k">return</span> <span class="n">locale</span><span class="o">.</span><span class="n">language</span> <span class="o">+</span> <span class="s1">&#39;-&#39;</span> <span class="o">+</span> <span class="n">locale</span><span class="o">.</span><span class="n">territory</span></div>
<div class="viewcode-block" id="language_tag">
<a class="viewcode-back" href="../../src/searx.locales.html#searx.locales.language_tag">[docs]</a>
<span class="k">def</span> <span class="nf">language_tag</span><span class="p">(</span><span class="n">locale</span><span class="p">:</span> <span class="n">babel</span><span class="o">.</span><span class="n">Locale</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;Returns SearXNG&#39;s language tag from the locale and if exits, the tag</span>
<span class="sd"> includes the script name (e.g. en, zh_Hant).</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">sxng_lang</span> <span class="o">=</span> <span class="n">locale</span><span class="o">.</span><span class="n">language</span>
<span class="k">if</span> <span class="n">locale</span><span class="o">.</span><span class="n">script</span><span class="p">:</span>
<span class="n">sxng_lang</span> <span class="o">+=</span> <span class="s1">&#39;_&#39;</span> <span class="o">+</span> <span class="n">locale</span><span class="o">.</span><span class="n">script</span>
<span class="k">return</span> <span class="n">sxng_lang</span></div>
<div class="viewcode-block" id="get_locale">
<a class="viewcode-back" href="../../src/searx.locales.html#searx.locales.get_locale">[docs]</a>
<span class="k">def</span> <span class="nf">get_locale</span><span class="p">(</span><span class="n">locale_tag</span><span class="p">:</span> <span class="nb">str</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">babel</span><span class="o">.</span><span class="n">Locale</span> <span class="o">|</span> <span class="kc">None</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;Returns a :py:obj:`babel.Locale` object parsed from argument</span>
<span class="sd"> ``locale_tag``&quot;&quot;&quot;</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">locale</span> <span class="o">=</span> <span class="n">babel</span><span class="o">.</span><span class="n">Locale</span><span class="o">.</span><span class="n">parse</span><span class="p">(</span><span class="n">locale_tag</span><span class="p">,</span> <span class="n">sep</span><span class="o">=</span><span class="s1">&#39;-&#39;</span><span class="p">)</span>
<span class="k">return</span> <span class="n">locale</span>
<span class="k">except</span> <span class="n">babel</span><span class="o">.</span><span class="n">core</span><span class="o">.</span><span class="n">UnknownLocaleError</span><span class="p">:</span>
<span class="k">return</span> <span class="kc">None</span></div>
<div class="viewcode-block" id="get_official_locales">
<a class="viewcode-back" href="../../src/searx.locales.html#searx.locales.get_official_locales">[docs]</a>
<span class="k">def</span> <span class="nf">get_official_locales</span><span class="p">(</span>
<span class="n">territory</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">languages</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">regional</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">False</span><span class="p">,</span> <span class="n">de_facto</span><span class="p">:</span> <span class="nb">bool</span> <span class="o">=</span> <span class="kc">True</span>
<span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">set</span><span class="p">[</span><span class="n">babel</span><span class="o">.</span><span class="n">Locale</span><span class="p">]:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;Returns a list of :py:obj:`babel.Locale` with languages from</span>
<span class="sd"> :py:obj:`babel.languages.get_official_languages`.</span>
<span class="sd"> :param territory: The territory (country or region) code.</span>
<span class="sd"> :param languages: A list of language codes the languages from</span>
<span class="sd"> :py:obj:`babel.languages.get_official_languages` should be in</span>
<span class="sd"> (intersection). If this argument is ``None``, all official languages in</span>
<span class="sd"> this territory are used.</span>
<span class="sd"> :param regional: If the regional flag is set, then languages which are</span>
<span class="sd"> regionally official are also returned.</span>
<span class="sd"> :param de_facto: If the de_facto flag is set to `False`, then languages</span>
<span class="sd"> which are “de facto” official are not returned.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">ret_val</span> <span class="o">=</span> <span class="nb">set</span><span class="p">()</span>
<span class="n">o_languages</span> <span class="o">=</span> <span class="n">babel</span><span class="o">.</span><span class="n">languages</span><span class="o">.</span><span class="n">get_official_languages</span><span class="p">(</span><span class="n">territory</span><span class="p">,</span> <span class="n">regional</span><span class="o">=</span><span class="n">regional</span><span class="p">,</span> <span class="n">de_facto</span><span class="o">=</span><span class="n">de_facto</span><span class="p">)</span>
<span class="k">if</span> <span class="n">languages</span><span class="p">:</span>
<span class="n">languages</span> <span class="o">=</span> <span class="p">[</span><span class="n">l</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span> <span class="k">for</span> <span class="n">l</span> <span class="ow">in</span> <span class="n">languages</span><span class="p">]</span>
<span class="n">o_languages</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">l</span> <span class="k">for</span> <span class="n">l</span> <span class="ow">in</span> <span class="n">o_languages</span> <span class="k">if</span> <span class="n">l</span><span class="o">.</span><span class="n">lower</span><span class="p">()</span> <span class="ow">in</span> <span class="n">languages</span><span class="p">)</span>
<span class="k">for</span> <span class="n">lang</span> <span class="ow">in</span> <span class="n">o_languages</span><span class="p">:</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">locale</span> <span class="o">=</span> <span class="n">babel</span><span class="o">.</span><span class="n">Locale</span><span class="o">.</span><span class="n">parse</span><span class="p">(</span><span class="n">lang</span> <span class="o">+</span> <span class="s1">&#39;_&#39;</span> <span class="o">+</span> <span class="n">territory</span><span class="p">)</span>
<span class="n">ret_val</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">locale</span><span class="p">)</span>
<span class="k">except</span> <span class="n">babel</span><span class="o">.</span><span class="n">UnknownLocaleError</span><span class="p">:</span>
<span class="k">continue</span>
<span class="k">return</span> <span class="n">ret_val</span></div>
<div class="viewcode-block" id="get_engine_locale">
<a class="viewcode-back" href="../../src/searx.locales.html#searx.locales.get_engine_locale">[docs]</a>
<span class="k">def</span> <span class="nf">get_engine_locale</span><span class="p">(</span><span class="n">searxng_locale</span><span class="p">,</span> <span class="n">engine_locales</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;Return engine&#39;s language (aka locale) string that best fits to argument</span>
<span class="sd"> ``searxng_locale``.</span>
<span class="sd"> Argument ``engine_locales`` is a python dict that maps *SearXNG locales* to</span>
<span class="sd"> corresponding *engine locales*::</span>
<span class="sd"> &lt;engine&gt;: {</span>
<span class="sd"> # SearXNG string : engine-string</span>
<span class="sd"> &#39;ca-ES&#39; : &#39;ca_ES&#39;,</span>
<span class="sd"> &#39;fr-BE&#39; : &#39;fr_BE&#39;,</span>
<span class="sd"> &#39;fr-CA&#39; : &#39;fr_CA&#39;,</span>
<span class="sd"> &#39;fr-CH&#39; : &#39;fr_CH&#39;,</span>
<span class="sd"> &#39;fr&#39; : &#39;fr_FR&#39;,</span>
<span class="sd"> ...</span>
<span class="sd"> &#39;pl-PL&#39; : &#39;pl_PL&#39;,</span>
<span class="sd"> &#39;pt-PT&#39; : &#39;pt_PT&#39;</span>
<span class="sd"> ..</span>
<span class="sd"> &#39;zh&#39; : &#39;zh&#39;</span>
<span class="sd"> &#39;zh_Hans&#39; : &#39;zh&#39;</span>
<span class="sd"> &#39;zh_Hant&#39; : &#39;zh_TW&#39;</span>
<span class="sd"> }</span>
<span class="sd"> .. hint::</span>
<span class="sd"> The *SearXNG locale* string has to be known by babel!</span>
<span class="sd"> If there is no direct 1:1 mapping, this functions tries to narrow down</span>
<span class="sd"> engine&#39;s language (locale). If no value can be determined by these</span>
<span class="sd"> approximation attempts the ``default`` value is returned.</span>
<span class="sd"> Assumptions:</span>
<span class="sd"> A. When user select a language the results should be optimized according to</span>
<span class="sd"> the selected language.</span>
<span class="sd"> B. When user select a language and a territory the results should be</span>
<span class="sd"> optimized with first priority on territory and second on language.</span>
<span class="sd"> First approximation rule (*by territory*):</span>
<span class="sd"> When the user selects a locale with territory (and a language), the</span>
<span class="sd"> territory has priority over the language. If any of the official languages</span>
<span class="sd"> in the territory is supported by the engine (``engine_locales``) it will</span>
<span class="sd"> be used.</span>
<span class="sd"> Second approximation rule (*by language*):</span>
<span class="sd"> If &quot;First approximation rule&quot; brings no result or the user selects only a</span>
<span class="sd"> language without a territory. Check in which territories the language</span>
<span class="sd"> has an official status and if one of these territories is supported by the</span>
<span class="sd"> engine.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="c1"># pylint: disable=too-many-branches, too-many-return-statements</span>
<span class="n">engine_locale</span> <span class="o">=</span> <span class="n">engine_locales</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">searxng_locale</span><span class="p">)</span>
<span class="k">if</span> <span class="n">engine_locale</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="c1"># There was a 1:1 mapping (e.g. a region &quot;fr-BE --&gt; fr_BE&quot; or a language</span>
<span class="c1"># &quot;zh --&gt; zh&quot;), no need to narrow language-script nor territory.</span>
<span class="k">return</span> <span class="n">engine_locale</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">locale</span> <span class="o">=</span> <span class="n">babel</span><span class="o">.</span><span class="n">Locale</span><span class="o">.</span><span class="n">parse</span><span class="p">(</span><span class="n">searxng_locale</span><span class="p">,</span> <span class="n">sep</span><span class="o">=</span><span class="s1">&#39;-&#39;</span><span class="p">)</span>
<span class="k">except</span> <span class="n">babel</span><span class="o">.</span><span class="n">core</span><span class="o">.</span><span class="n">UnknownLocaleError</span><span class="p">:</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">locale</span> <span class="o">=</span> <span class="n">babel</span><span class="o">.</span><span class="n">Locale</span><span class="o">.</span><span class="n">parse</span><span class="p">(</span><span class="n">searxng_locale</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">&#39;-&#39;</span><span class="p">)[</span><span class="mi">0</span><span class="p">])</span>
<span class="k">except</span> <span class="n">babel</span><span class="o">.</span><span class="n">core</span><span class="o">.</span><span class="n">UnknownLocaleError</span><span class="p">:</span>
<span class="k">return</span> <span class="n">default</span>
<span class="n">searxng_lang</span> <span class="o">=</span> <span class="n">language_tag</span><span class="p">(</span><span class="n">locale</span><span class="p">)</span>
<span class="n">engine_locale</span> <span class="o">=</span> <span class="n">engine_locales</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">searxng_lang</span><span class="p">)</span>
<span class="k">if</span> <span class="n">engine_locale</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="c1"># There was a 1:1 mapping (e.g. &quot;zh-HK --&gt; zh_Hant&quot; or &quot;zh-CN --&gt; zh_Hans&quot;)</span>
<span class="k">return</span> <span class="n">engine_locale</span>
<span class="c1"># SearXNG&#39;s selected locale is not supported by the engine ..</span>
<span class="k">if</span> <span class="n">locale</span><span class="o">.</span><span class="n">territory</span><span class="p">:</span>
<span class="c1"># Try to narrow by *official* languages in the territory (??-XX).</span>
<span class="k">for</span> <span class="n">official_language</span> <span class="ow">in</span> <span class="n">babel</span><span class="o">.</span><span class="n">languages</span><span class="o">.</span><span class="n">get_official_languages</span><span class="p">(</span><span class="n">locale</span><span class="o">.</span><span class="n">territory</span><span class="p">,</span> <span class="n">de_facto</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
<span class="n">searxng_locale</span> <span class="o">=</span> <span class="n">official_language</span> <span class="o">+</span> <span class="s1">&#39;-&#39;</span> <span class="o">+</span> <span class="n">locale</span><span class="o">.</span><span class="n">territory</span>
<span class="n">engine_locale</span> <span class="o">=</span> <span class="n">engine_locales</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">searxng_locale</span><span class="p">)</span>
<span class="k">if</span> <span class="n">engine_locale</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span> <span class="n">engine_locale</span>
<span class="c1"># Engine does not support one of the official languages in the territory or</span>
<span class="c1"># there is only a language selected without a territory.</span>
<span class="c1"># Now lets have a look if the searxng_lang (the language selected by the</span>
<span class="c1"># user) is a official language in other territories. If so, check if</span>
<span class="c1"># engine does support the searxng_lang in this other territory.</span>
<span class="k">if</span> <span class="n">locale</span><span class="o">.</span><span class="n">language</span><span class="p">:</span>
<span class="n">terr_lang_dict</span> <span class="o">=</span> <span class="p">{}</span>
<span class="k">for</span> <span class="n">territory</span><span class="p">,</span> <span class="n">langs</span> <span class="ow">in</span> <span class="n">babel</span><span class="o">.</span><span class="n">core</span><span class="o">.</span><span class="n">get_global</span><span class="p">(</span><span class="s2">&quot;territory_languages&quot;</span><span class="p">)</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">langs</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">searxng_lang</span><span class="p">,</span> <span class="p">{})</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;official_status&#39;</span><span class="p">):</span>
<span class="k">continue</span>
<span class="n">terr_lang_dict</span><span class="p">[</span><span class="n">territory</span><span class="p">]</span> <span class="o">=</span> <span class="n">langs</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">searxng_lang</span><span class="p">)</span>
<span class="c1"># first: check fr-FR, de-DE .. is supported by the engine</span>
<span class="c1"># exception: &#39;en&#39; --&gt; &#39;en-US&#39;</span>
<span class="n">territory</span> <span class="o">=</span> <span class="n">locale</span><span class="o">.</span><span class="n">language</span><span class="o">.</span><span class="n">upper</span><span class="p">()</span>
<span class="k">if</span> <span class="n">territory</span> <span class="o">==</span> <span class="s1">&#39;EN&#39;</span><span class="p">:</span>
<span class="n">territory</span> <span class="o">=</span> <span class="s1">&#39;US&#39;</span>
<span class="k">if</span> <span class="n">terr_lang_dict</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">territory</span><span class="p">):</span>
<span class="n">searxng_locale</span> <span class="o">=</span> <span class="n">locale</span><span class="o">.</span><span class="n">language</span> <span class="o">+</span> <span class="s1">&#39;-&#39;</span> <span class="o">+</span> <span class="n">territory</span>
<span class="n">engine_locale</span> <span class="o">=</span> <span class="n">engine_locales</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">searxng_locale</span><span class="p">)</span>
<span class="k">if</span> <span class="n">engine_locale</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span> <span class="n">engine_locale</span>
<span class="c1"># second: sort by population_percent and take first match</span>
<span class="c1"># drawback of &quot;population percent&quot;: if there is a territory with a</span>
<span class="c1"># small number of people (e.g 100) but the majority speaks the</span>
<span class="c1"># language, then the percentage might be 100% (--&gt; 100 people) but in</span>
<span class="c1"># a different territory with more people (e.g. 10.000) where only 10%</span>
<span class="c1"># speak the language the total amount of speaker is higher (--&gt; 200</span>
<span class="c1"># people).</span>
<span class="c1">#</span>
<span class="c1"># By example: The population of Saint-Martin is 33.000, of which 100%</span>
<span class="c1"># speak French, but this is less than the 30% of the approximately 2.5</span>
<span class="c1"># million Belgian citizens</span>
<span class="c1">#</span>
<span class="c1"># - &#39;fr-MF&#39;, &#39;population_percent&#39;: 100.0, &#39;official_status&#39;: &#39;official&#39;</span>
<span class="c1"># - &#39;fr-BE&#39;, &#39;population_percent&#39;: 38.0, &#39;official_status&#39;: &#39;official&#39;</span>
<span class="n">terr_lang_list</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">terr_lang_dict</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
<span class="n">terr_lang_list</span><span class="o">.</span><span class="n">append</span><span class="p">((</span><span class="n">k</span><span class="p">,</span> <span class="n">v</span><span class="p">))</span>
<span class="k">for</span> <span class="n">territory</span><span class="p">,</span> <span class="n">_lang</span> <span class="ow">in</span> <span class="nb">sorted</span><span class="p">(</span><span class="n">terr_lang_list</span><span class="p">,</span> <span class="n">key</span><span class="o">=</span><span class="k">lambda</span> <span class="n">item</span><span class="p">:</span> <span class="n">item</span><span class="p">[</span><span class="mi">1</span><span class="p">][</span><span class="s1">&#39;population_percent&#39;</span><span class="p">],</span> <span class="n">reverse</span><span class="o">=</span><span class="kc">True</span><span class="p">):</span>
<span class="n">searxng_locale</span> <span class="o">=</span> <span class="n">locale</span><span class="o">.</span><span class="n">language</span> <span class="o">+</span> <span class="s1">&#39;-&#39;</span> <span class="o">+</span> <span class="n">territory</span>
<span class="n">engine_locale</span> <span class="o">=</span> <span class="n">engine_locales</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">searxng_locale</span><span class="p">)</span>
<span class="k">if</span> <span class="n">engine_locale</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span> <span class="n">engine_locale</span>
<span class="c1"># No luck: narrow by &quot;language from territory&quot; and &quot;territory from language&quot;</span>
<span class="c1"># does not fit to a locale supported by the engine.</span>
<span class="k">if</span> <span class="n">engine_locale</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">engine_locale</span> <span class="o">=</span> <span class="n">default</span>
<span class="k">return</span> <span class="n">default</span></div>
<div class="viewcode-block" id="match_locale">
<a class="viewcode-back" href="../../src/searx.locales.html#searx.locales.match_locale">[docs]</a>
<span class="k">def</span> <span class="nf">match_locale</span><span class="p">(</span><span class="n">searxng_locale</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">locale_tag_list</span><span class="p">:</span> <span class="nb">list</span><span class="p">[</span><span class="nb">str</span><span class="p">],</span> <span class="n">fallback</span><span class="p">:</span> <span class="nb">str</span> <span class="o">|</span> <span class="kc">None</span> <span class="o">=</span> <span class="kc">None</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span> <span class="o">|</span> <span class="kc">None</span><span class="p">:</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;Return tag from ``locale_tag_list`` that best fits to ``searxng_locale``.</span>
<span class="sd"> :param str searxng_locale: SearXNG&#39;s internal representation of locale (de,</span>
<span class="sd"> de-DE, fr-BE, zh, zh-CN, zh-TW ..).</span>
<span class="sd"> :param list locale_tag_list: The list of locale tags to select from</span>
<span class="sd"> :param str fallback: fallback locale tag (if unset --&gt; ``None``)</span>
<span class="sd"> The rules to find a match are implemented in :py:obj:`get_engine_locale`,</span>
<span class="sd"> the ``engine_locales`` is build up by :py:obj:`build_engine_locales`.</span>
<span class="sd"> .. hint::</span>
<span class="sd"> The *SearXNG locale* string and the members of ``locale_tag_list`` has to</span>
<span class="sd"> be known by babel! The :py:obj:`ADDITIONAL_TRANSLATIONS` are used in the</span>
<span class="sd"> UI and are not known by babel --&gt; will be ignored.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="c1"># searxng_locale = &#39;es&#39;</span>
<span class="c1"># locale_tag_list = [&#39;es-AR&#39;, &#39;es-ES&#39;, &#39;es-MX&#39;]</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">searxng_locale</span><span class="p">:</span>
<span class="k">return</span> <span class="n">fallback</span>
<span class="n">locale</span> <span class="o">=</span> <span class="n">get_locale</span><span class="p">(</span><span class="n">searxng_locale</span><span class="p">)</span>
<span class="k">if</span> <span class="n">locale</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span> <span class="n">fallback</span>
<span class="c1"># normalize to a SearXNG locale that can be passed to get_engine_locale</span>
<span class="n">searxng_locale</span> <span class="o">=</span> <span class="n">language_tag</span><span class="p">(</span><span class="n">locale</span><span class="p">)</span>
<span class="k">if</span> <span class="n">locale</span><span class="o">.</span><span class="n">territory</span><span class="p">:</span>
<span class="n">searxng_locale</span> <span class="o">=</span> <span class="n">region_tag</span><span class="p">(</span><span class="n">locale</span><span class="p">)</span>
<span class="c1"># clean up locale_tag_list</span>
<span class="n">tag_list</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="n">tag</span> <span class="ow">in</span> <span class="n">locale_tag_list</span><span class="p">:</span>
<span class="k">if</span> <span class="n">tag</span> <span class="ow">in</span> <span class="p">(</span><span class="s1">&#39;all&#39;</span><span class="p">,</span> <span class="s1">&#39;auto&#39;</span><span class="p">)</span> <span class="ow">or</span> <span class="n">tag</span> <span class="ow">in</span> <span class="n">ADDITIONAL_TRANSLATIONS</span><span class="p">:</span>
<span class="k">continue</span>
<span class="n">tag_list</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">tag</span><span class="p">)</span>
<span class="c1"># emulate fetch_traits</span>
<span class="n">engine_locales</span> <span class="o">=</span> <span class="n">build_engine_locales</span><span class="p">(</span><span class="n">tag_list</span><span class="p">)</span>
<span class="k">return</span> <span class="n">get_engine_locale</span><span class="p">(</span><span class="n">searxng_locale</span><span class="p">,</span> <span class="n">engine_locales</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="n">fallback</span><span class="p">)</span></div>
<div class="viewcode-block" id="build_engine_locales">
<a class="viewcode-back" href="../../src/searx.locales.html#searx.locales.build_engine_locales">[docs]</a>
<span class="k">def</span> <span class="nf">build_engine_locales</span><span class="p">(</span><span class="n">tag_list</span><span class="p">:</span> <span class="nb">list</span><span class="p">[</span><span class="nb">str</span><span class="p">]):</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;From a list of locale tags a dictionary is build that can be passed by</span>
<span class="sd"> argument ``engine_locales`` to :py:obj:`get_engine_locale`. This function</span>
<span class="sd"> is mainly used by :py:obj:`match_locale` and is similar to what the</span>
<span class="sd"> ``fetch_traits(..)`` function of engines do.</span>
<span class="sd"> If there are territory codes in the ``tag_list`` that have a *script code*</span>
<span class="sd"> additional keys are added to the returned dictionary.</span>
<span class="sd"> .. code:: python</span>
<span class="sd"> &gt;&gt;&gt; import locales</span>
<span class="sd"> &gt;&gt;&gt; engine_locales = locales.build_engine_locales([&#39;en&#39;, &#39;en-US&#39;, &#39;zh&#39;, &#39;zh-CN&#39;, &#39;zh-TW&#39;])</span>
<span class="sd"> &gt;&gt;&gt; engine_locales</span>
<span class="sd"> {</span>
<span class="sd"> &#39;en&#39;: &#39;en&#39;, &#39;en-US&#39;: &#39;en-US&#39;,</span>
<span class="sd"> &#39;zh&#39;: &#39;zh&#39;, &#39;zh-CN&#39;: &#39;zh-CN&#39;, &#39;zh_Hans&#39;: &#39;zh-CN&#39;,</span>
<span class="sd"> &#39;zh-TW&#39;: &#39;zh-TW&#39;, &#39;zh_Hant&#39;: &#39;zh-TW&#39;</span>
<span class="sd"> }</span>
<span class="sd"> &gt;&gt;&gt; get_engine_locale(&#39;zh-Hans&#39;, engine_locales)</span>
<span class="sd"> &#39;zh-CN&#39;</span>
<span class="sd"> This function is a good example to understand the language/region model</span>
<span class="sd"> of SearXNG:</span>
<span class="sd"> SearXNG only distinguishes between **search languages** and **search</span>
<span class="sd"> regions**, by adding the *script-tags*, languages with *script-tags* can</span>
<span class="sd"> be assigned to the **regions** that SearXNG supports.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="n">engine_locales</span> <span class="o">=</span> <span class="p">{}</span>
<span class="k">for</span> <span class="n">tag</span> <span class="ow">in</span> <span class="n">tag_list</span><span class="p">:</span>
<span class="n">locale</span> <span class="o">=</span> <span class="n">get_locale</span><span class="p">(</span><span class="n">tag</span><span class="p">)</span>
<span class="k">if</span> <span class="n">locale</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">warning</span><span class="p">(</span><span class="s2">&quot;build_engine_locales: skip locale tag </span><span class="si">%s</span><span class="s2"> / unknown by babel&quot;</span><span class="p">,</span> <span class="n">tag</span><span class="p">)</span>
<span class="k">continue</span>
<span class="k">if</span> <span class="n">locale</span><span class="o">.</span><span class="n">territory</span><span class="p">:</span>
<span class="n">engine_locales</span><span class="p">[</span><span class="n">region_tag</span><span class="p">(</span><span class="n">locale</span><span class="p">)]</span> <span class="o">=</span> <span class="n">tag</span>
<span class="k">if</span> <span class="n">locale</span><span class="o">.</span><span class="n">script</span><span class="p">:</span>
<span class="n">engine_locales</span><span class="p">[</span><span class="n">language_tag</span><span class="p">(</span><span class="n">locale</span><span class="p">)]</span> <span class="o">=</span> <span class="n">tag</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">engine_locales</span><span class="p">[</span><span class="n">language_tag</span><span class="p">(</span><span class="n">locale</span><span class="p">)]</span> <span class="o">=</span> <span class="n">tag</span>
<span class="k">return</span> <span class="n">engine_locales</span></div>
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