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<h1>Source code for searx.plugins.calculator</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;Calculate mathematical expressions using :py:obj:`ast.parse` (mode=&quot;eval&quot;).</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">__future__</span><span class="w"> </span><span class="kn">import</span> <span class="n">annotations</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">typing</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">ast</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">re</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">operator</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">multiprocessing</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">babel</span>
<span class="kn">import</span><span class="w"> </span><span class="nn">babel.numbers</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">flask_babel</span><span class="w"> </span><span class="kn">import</span> <span class="n">gettext</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">searx.result_types</span><span class="w"> </span><span class="kn">import</span> <span class="n">EngineResults</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">searx.plugins</span><span class="w"> </span><span class="kn">import</span> <span class="n">Plugin</span><span class="p">,</span> <span class="n">PluginInfo</span>
<span class="k">if</span> <span class="n">typing</span><span class="o">.</span><span class="n">TYPE_CHECKING</span><span class="p">:</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">searx.search</span><span class="w"> </span><span class="kn">import</span> <span class="n">SearchWithPlugins</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">searx.extended_types</span><span class="w"> </span><span class="kn">import</span> <span class="n">SXNG_Request</span>
<span class="kn">from</span><span class="w"> </span><span class="nn">searx.plugins</span><span class="w"> </span><span class="kn">import</span> <span class="n">PluginCfg</span>
<div class="viewcode-block" id="SXNGPlugin">
<a class="viewcode-back" href="../../../dev/plugins/calculator.html#searx.plugins.calculator.SXNGPlugin">[docs]</a>
<span class="k">class</span><span class="w"> </span><span class="nc">SXNGPlugin</span><span class="p">(</span><span class="n">Plugin</span><span class="p">):</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;Plugin converts strings to different hash digests. The results are</span>
<span class="sd"> displayed in area for the &quot;answers&quot;.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="nb">id</span> <span class="o">=</span> <span class="s2">&quot;calculator&quot;</span>
<span class="k">def</span><span class="w"> </span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">plg_cfg</span><span class="p">:</span> <span class="s2">&quot;PluginCfg&quot;</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="kc">None</span><span class="p">:</span>
<span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="n">plg_cfg</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">info</span> <span class="o">=</span> <span class="n">PluginInfo</span><span class="p">(</span>
<span class="nb">id</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">id</span><span class="p">,</span>
<span class="n">name</span><span class="o">=</span><span class="n">gettext</span><span class="p">(</span><span class="s2">&quot;Basic Calculator&quot;</span><span class="p">),</span>
<span class="n">description</span><span class="o">=</span><span class="n">gettext</span><span class="p">(</span><span class="s2">&quot;Calculate mathematical expressions via the search bar&quot;</span><span class="p">),</span>
<span class="n">preference_section</span><span class="o">=</span><span class="s2">&quot;general&quot;</span><span class="p">,</span>
<span class="p">)</span>
<div class="viewcode-block" id="SXNGPlugin.post_search">
<a class="viewcode-back" href="../../../dev/plugins/calculator.html#searx.plugins.calculator.SXNGPlugin.post_search">[docs]</a>
<span class="k">def</span><span class="w"> </span><span class="nf">post_search</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">request</span><span class="p">:</span> <span class="s2">&quot;SXNG_Request&quot;</span><span class="p">,</span> <span class="n">search</span><span class="p">:</span> <span class="s2">&quot;SearchWithPlugins&quot;</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">EngineResults</span><span class="p">:</span>
<span class="n">results</span> <span class="o">=</span> <span class="n">EngineResults</span><span class="p">()</span>
<span class="c1"># only show the result of the expression on the first page</span>
<span class="k">if</span> <span class="n">search</span><span class="o">.</span><span class="n">search_query</span><span class="o">.</span><span class="n">pageno</span> <span class="o">&gt;</span> <span class="mi">1</span><span class="p">:</span>
<span class="k">return</span> <span class="n">results</span>
<span class="n">query</span> <span class="o">=</span> <span class="n">search</span><span class="o">.</span><span class="n">search_query</span><span class="o">.</span><span class="n">query</span>
<span class="c1"># in order to avoid DoS attacks with long expressions, ignore long expressions</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">query</span><span class="p">)</span> <span class="o">&gt;</span> <span class="mi">100</span><span class="p">:</span>
<span class="k">return</span> <span class="n">results</span>
<span class="c1"># replace commonly used math operators with their proper Python operator</span>
<span class="n">query</span> <span class="o">=</span> <span class="n">query</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="s2">&quot;x&quot;</span><span class="p">,</span> <span class="s2">&quot;*&quot;</span><span class="p">)</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="s2">&quot;:&quot;</span><span class="p">,</span> <span class="s2">&quot;/&quot;</span><span class="p">)</span>
<span class="c1"># use UI language</span>
<span class="n">ui_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">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="s2">&quot;locale&quot;</span><span class="p">),</span> <span class="n">sep</span><span class="o">=</span><span class="s2">&quot;-&quot;</span><span class="p">)</span>
<span class="c1"># parse the number system in a localized way</span>
<span class="k">def</span><span class="w"> </span><span class="nf">_decimal</span><span class="p">(</span><span class="n">match</span><span class="p">:</span> <span class="n">re</span><span class="o">.</span><span class="n">Match</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
<span class="n">val</span> <span class="o">=</span> <span class="n">match</span><span class="o">.</span><span class="n">string</span><span class="p">[</span><span class="n">match</span><span class="o">.</span><span class="n">start</span><span class="p">()</span> <span class="p">:</span> <span class="n">match</span><span class="o">.</span><span class="n">end</span><span class="p">()]</span>
<span class="n">val</span> <span class="o">=</span> <span class="n">babel</span><span class="o">.</span><span class="n">numbers</span><span class="o">.</span><span class="n">parse_decimal</span><span class="p">(</span><span class="n">val</span><span class="p">,</span> <span class="n">ui_locale</span><span class="p">,</span> <span class="n">numbering_system</span><span class="o">=</span><span class="s2">&quot;latn&quot;</span><span class="p">)</span>
<span class="k">return</span> <span class="nb">str</span><span class="p">(</span><span class="n">val</span><span class="p">)</span>
<span class="n">decimal</span> <span class="o">=</span> <span class="n">ui_locale</span><span class="o">.</span><span class="n">number_symbols</span><span class="p">[</span><span class="s2">&quot;latn&quot;</span><span class="p">][</span><span class="s2">&quot;decimal&quot;</span><span class="p">]</span>
<span class="n">group</span> <span class="o">=</span> <span class="n">ui_locale</span><span class="o">.</span><span class="n">number_symbols</span><span class="p">[</span><span class="s2">&quot;latn&quot;</span><span class="p">][</span><span class="s2">&quot;group&quot;</span><span class="p">]</span>
<span class="n">query</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">sub</span><span class="p">(</span><span class="sa">f</span><span class="s2">&quot;[0-9]+[</span><span class="si">{</span><span class="n">decimal</span><span class="si">}</span><span class="s2">|</span><span class="si">{</span><span class="n">group</span><span class="si">}</span><span class="s2">][0-9]+[</span><span class="si">{</span><span class="n">decimal</span><span class="si">}</span><span class="s2">|</span><span class="si">{</span><span class="n">group</span><span class="si">}</span><span class="s2">]?[0-9]?&quot;</span><span class="p">,</span> <span class="n">_decimal</span><span class="p">,</span> <span class="n">query</span><span class="p">)</span>
<span class="c1"># only numbers and math operators are accepted</span>
<span class="k">if</span> <span class="nb">any</span><span class="p">(</span><span class="nb">str</span><span class="o">.</span><span class="n">isalpha</span><span class="p">(</span><span class="n">c</span><span class="p">)</span> <span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">query</span><span class="p">):</span>
<span class="k">return</span> <span class="n">results</span>
<span class="c1"># in python, powers are calculated via **</span>
<span class="n">query_py_formatted</span> <span class="o">=</span> <span class="n">query</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="s2">&quot;^&quot;</span><span class="p">,</span> <span class="s2">&quot;**&quot;</span><span class="p">)</span>
<span class="c1"># Prevent the runtime from being longer than 50 ms</span>
<span class="n">res</span> <span class="o">=</span> <span class="n">timeout_func</span><span class="p">(</span><span class="mf">0.05</span><span class="p">,</span> <span class="n">_eval_expr</span><span class="p">,</span> <span class="n">query_py_formatted</span><span class="p">)</span>
<span class="k">if</span> <span class="n">res</span> <span class="ow">is</span> <span class="kc">None</span> <span class="ow">or</span> <span class="n">res</span> <span class="o">==</span> <span class="s2">&quot;&quot;</span><span class="p">:</span>
<span class="k">return</span> <span class="n">results</span>
<span class="n">res</span> <span class="o">=</span> <span class="n">babel</span><span class="o">.</span><span class="n">numbers</span><span class="o">.</span><span class="n">format_decimal</span><span class="p">(</span><span class="n">res</span><span class="p">,</span> <span class="n">locale</span><span class="o">=</span><span class="n">ui_locale</span><span class="p">)</span>
<span class="n">results</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">results</span><span class="o">.</span><span class="n">types</span><span class="o">.</span><span class="n">Answer</span><span class="p">(</span><span class="n">answer</span><span class="o">=</span><span class="sa">f</span><span class="s2">&quot;</span><span class="si">{</span><span class="n">search</span><span class="o">.</span><span class="n">search_query</span><span class="o">.</span><span class="n">query</span><span class="si">}</span><span class="s2"> = </span><span class="si">{</span><span class="n">res</span><span class="si">}</span><span class="s2">&quot;</span><span class="p">))</span>
<span class="k">return</span> <span class="n">results</span></div>
</div>
<span class="n">operators</span><span class="p">:</span> <span class="nb">dict</span><span class="p">[</span><span class="nb">type</span><span class="p">,</span> <span class="n">typing</span><span class="o">.</span><span class="n">Callable</span><span class="p">]</span> <span class="o">=</span> <span class="p">{</span>
<span class="n">ast</span><span class="o">.</span><span class="n">Add</span><span class="p">:</span> <span class="n">operator</span><span class="o">.</span><span class="n">add</span><span class="p">,</span>
<span class="n">ast</span><span class="o">.</span><span class="n">Sub</span><span class="p">:</span> <span class="n">operator</span><span class="o">.</span><span class="n">sub</span><span class="p">,</span>
<span class="n">ast</span><span class="o">.</span><span class="n">Mult</span><span class="p">:</span> <span class="n">operator</span><span class="o">.</span><span class="n">mul</span><span class="p">,</span>
<span class="n">ast</span><span class="o">.</span><span class="n">Div</span><span class="p">:</span> <span class="n">operator</span><span class="o">.</span><span class="n">truediv</span><span class="p">,</span>
<span class="n">ast</span><span class="o">.</span><span class="n">Pow</span><span class="p">:</span> <span class="n">operator</span><span class="o">.</span><span class="n">pow</span><span class="p">,</span>
<span class="n">ast</span><span class="o">.</span><span class="n">BitXor</span><span class="p">:</span> <span class="n">operator</span><span class="o">.</span><span class="n">xor</span><span class="p">,</span>
<span class="n">ast</span><span class="o">.</span><span class="n">USub</span><span class="p">:</span> <span class="n">operator</span><span class="o">.</span><span class="n">neg</span><span class="p">,</span>
<span class="p">}</span>
<span class="c1"># with multiprocessing.get_context(&quot;fork&quot;) we are ready for Py3.14 (by emulating</span>
<span class="c1"># the old behavior &quot;fork&quot;) but it will not solve the core problem of fork, nor</span>
<span class="c1"># will it remove the deprecation warnings in py3.12 &amp; py3.13. Issue is</span>
<span class="c1"># ddiscussed here: https://github.com/searxng/searxng/issues/4159</span>
<span class="n">mp_fork</span> <span class="o">=</span> <span class="n">multiprocessing</span><span class="o">.</span><span class="n">get_context</span><span class="p">(</span><span class="s2">&quot;fork&quot;</span><span class="p">)</span>
<span class="k">def</span><span class="w"> </span><span class="nf">_eval_expr</span><span class="p">(</span><span class="n">expr</span><span class="p">):</span>
<span class="w"> </span><span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> &gt;&gt;&gt; _eval_expr(&#39;2^6&#39;)</span>
<span class="sd"> 64</span>
<span class="sd"> &gt;&gt;&gt; _eval_expr(&#39;2**6&#39;)</span>
<span class="sd"> 64</span>
<span class="sd"> &gt;&gt;&gt; _eval_expr(&#39;1 + 2*3**(4^5) / (6 + -7)&#39;)</span>
<span class="sd"> -5.0</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="n">_eval</span><span class="p">(</span><span class="n">ast</span><span class="o">.</span><span class="n">parse</span><span class="p">(</span><span class="n">expr</span><span class="p">,</span> <span class="n">mode</span><span class="o">=</span><span class="s1">&#39;eval&#39;</span><span class="p">)</span><span class="o">.</span><span class="n">body</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">ZeroDivisionError</span><span class="p">:</span>
<span class="c1"># This is undefined</span>
<span class="k">return</span> <span class="s2">&quot;&quot;</span>
<span class="k">def</span><span class="w"> </span><span class="nf">_eval</span><span class="p">(</span><span class="n">node</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">ast</span><span class="o">.</span><span class="n">Constant</span><span class="p">)</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="o">.</span><span class="n">value</span><span class="p">,</span> <span class="p">(</span><span class="nb">int</span><span class="p">,</span> <span class="nb">float</span><span class="p">)):</span>
<span class="k">return</span> <span class="n">node</span><span class="o">.</span><span class="n">value</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">ast</span><span class="o">.</span><span class="n">BinOp</span><span class="p">):</span>
<span class="k">return</span> <span class="n">operators</span><span class="p">[</span><span class="nb">type</span><span class="p">(</span><span class="n">node</span><span class="o">.</span><span class="n">op</span><span class="p">)](</span><span class="n">_eval</span><span class="p">(</span><span class="n">node</span><span class="o">.</span><span class="n">left</span><span class="p">),</span> <span class="n">_eval</span><span class="p">(</span><span class="n">node</span><span class="o">.</span><span class="n">right</span><span class="p">))</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="n">ast</span><span class="o">.</span><span class="n">UnaryOp</span><span class="p">):</span>
<span class="k">return</span> <span class="n">operators</span><span class="p">[</span><span class="nb">type</span><span class="p">(</span><span class="n">node</span><span class="o">.</span><span class="n">op</span><span class="p">)](</span><span class="n">_eval</span><span class="p">(</span><span class="n">node</span><span class="o">.</span><span class="n">operand</span><span class="p">))</span>
<span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="n">node</span><span class="p">)</span>
<span class="k">def</span><span class="w"> </span><span class="nf">handler</span><span class="p">(</span><span class="n">q</span><span class="p">:</span> <span class="n">multiprocessing</span><span class="o">.</span><span class="n">Queue</span><span class="p">,</span> <span class="n">func</span><span class="p">,</span> <span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span> <span class="c1"># pylint:disable=invalid-name</span>
<span class="k">try</span><span class="p">:</span>
<span class="n">q</span><span class="o">.</span><span class="n">put</span><span class="p">(</span><span class="n">func</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">))</span>
<span class="k">except</span><span class="p">:</span>
<span class="n">q</span><span class="o">.</span><span class="n">put</span><span class="p">(</span><span class="kc">None</span><span class="p">)</span>
<span class="k">raise</span>
<span class="k">def</span><span class="w"> </span><span class="nf">timeout_func</span><span class="p">(</span><span class="n">timeout</span><span class="p">,</span> <span class="n">func</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="n">que</span> <span class="o">=</span> <span class="n">mp_fork</span><span class="o">.</span><span class="n">Queue</span><span class="p">()</span>
<span class="n">p</span> <span class="o">=</span> <span class="n">mp_fork</span><span class="o">.</span><span class="n">Process</span><span class="p">(</span><span class="n">target</span><span class="o">=</span><span class="n">handler</span><span class="p">,</span> <span class="n">args</span><span class="o">=</span><span class="p">(</span><span class="n">que</span><span class="p">,</span> <span class="n">func</span><span class="p">,</span> <span class="n">args</span><span class="p">),</span> <span class="n">kwargs</span><span class="o">=</span><span class="n">kwargs</span><span class="p">)</span>
<span class="n">p</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
<span class="n">p</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">timeout</span><span class="o">=</span><span class="n">timeout</span><span class="p">)</span>
<span class="n">ret_val</span> <span class="o">=</span> <span class="kc">None</span>
<span class="c1"># pylint: disable=used-before-assignment,undefined-variable</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">p</span><span class="o">.</span><span class="n">is_alive</span><span class="p">():</span>
<span class="n">ret_val</span> <span class="o">=</span> <span class="n">que</span><span class="o">.</span><span class="n">get</span><span class="p">()</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">logger</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">&quot;terminate function after timeout is exceeded&quot;</span><span class="p">)</span> <span class="c1"># type: ignore</span>
<span class="n">p</span><span class="o">.</span><span class="n">terminate</span><span class="p">()</span>
<span class="n">p</span><span class="o">.</span><span class="n">join</span><span class="p">()</span>
<span class="n">p</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
<span class="k">return</span> <span class="n">ret_val</span>
</pre></div>
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