init

joomla_data/plugins/system/highlight/highlight.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<extension type="plugin" group="system" method="upgrade">
+	<name>plg_system_highlight</name>
+	<author>Joomla! Project</author>
+	<creationDate>2011-08</creationDate>
+	<copyright>(C) 2011 Open Source Matters, Inc.</copyright>
+	<license>GNU General Public License version 2 or later; see	LICENSE.txt</license>
+	<authorEmail>admin@joomla.org</authorEmail>
+	<authorUrl>www.joomla.org</authorUrl>
+	<version>3.0.0</version>
+	<description>PLG_SYSTEM_HIGHLIGHT_XML_DESCRIPTION</description>
+	<namespace path="src">Joomla\Plugin\System\Highlight</namespace>
+	<files>
+		<folder plugin="highlight">services</folder>
+		<folder>src</folder>
+	</files>
+	<languages>
+		<language tag="en-GB">language/en-GB/plg_system_highlight.ini</language>
+		<language tag="en-GB">language/en-GB/plg_system_highlight.sys.ini</language>
+	</languages>
+</extension>

joomla_data/plugins/system/highlight/services/provider.php

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+<?php
+
+/**
+ * @package     Joomla.Plugin
+ * @subpackage  System.highlight
+ *
+ * @copyright   (C) 2023 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+\defined('_JEXEC') or die;
+
+use Joomla\CMS\Extension\PluginInterface;
+use Joomla\CMS\Plugin\PluginHelper;
+use Joomla\DI\Container;
+use Joomla\DI\ServiceProviderInterface;
+use Joomla\Plugin\System\Highlight\Extension\Highlight;
+
+return new class () implements ServiceProviderInterface {
+    /**
+     * Registers the service provider with a DI container.
+     *
+     * @param   Container  $container  The DI container.
+     *
+     * @return  void
+     *
+     * @since   4.4.0
+     */
+    public function register(Container $container): void
+    {
+        $container->set(
+            PluginInterface::class,
+            $container->lazy(Highlight::class, function (Container $container) {
+                $plugin     = new Highlight(
+                    (array) PluginHelper::getPlugin('system', 'highlight')
+                );
+
+                return $plugin;
+            })
+        );
+    }
+};

joomla_data/plugins/system/highlight/src/Extension/Highlight.php

@@ -0,0 +1,151 @@
+<?php
+
+/**
+ * @package     Joomla.Plugin
+ * @subpackage  System.highlight
+ *
+ * @copyright   (C) 2011 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+namespace Joomla\Plugin\System\Highlight\Extension;
+
+use Joomla\CMS\Component\ComponentHelper;
+use Joomla\CMS\Event\Application\AfterDispatchEvent;
+use Joomla\CMS\Event\Finder\ResultEvent;
+use Joomla\CMS\Filter\InputFilter;
+use Joomla\CMS\Plugin\CMSPlugin;
+use Joomla\CMS\Uri\Uri;
+use Joomla\Event\SubscriberInterface;
+
+// phpcs:disable PSR1.Files.SideEffects
+\defined('_JEXEC') or die;
+// phpcs:enable PSR1.Files.SideEffects
+
+/**
+ * System plugin to highlight terms.
+ *
+ * @since  2.5
+ */
+final class Highlight extends CMSPlugin implements SubscriberInterface
+{
+    /**
+     * Returns an array of events this subscriber will listen to.
+     *
+     * @return array
+     *
+     * @since   5.3.0
+     */
+    public static function getSubscribedEvents(): array
+    {
+        return [
+            'onAfterDispatch' => 'onAfterDispatch',
+            'onFinderResult'  => 'onFinderResult',
+        ];
+    }
+
+    /**
+     * Method to catch the onAfterDispatch event.
+     *
+     * This is where we setup the click-through content highlighting for.
+     * The highlighting is done with JavaScript so we just
+     * need to check a few parameters and the JHtml behavior will do the rest.
+     *
+     * @param  AfterDispatchEvent $event  The event object
+     *
+     * @return  void
+     *
+     * @since   2.5
+     */
+    public function onAfterDispatch(AfterDispatchEvent $event): void
+    {
+        // Check that we are in the site application.
+        if (!$event->getApplication()->isClient('site')) {
+            return;
+        }
+
+        // Set the variables.
+        $input     = $event->getApplication()->getInput();
+        $extension = $input->get('option', '', 'cmd');
+
+        // Check if the highlighter is enabled.
+        if (!ComponentHelper::getParams($extension)->get('highlight_terms', 1)) {
+            return;
+        }
+
+        // Check if the highlighter should be activated in this environment.
+        if ($input->get('tmpl', '', 'cmd') === 'component' || $event->getApplication()->getDocument()->getType() !== 'html') {
+            return;
+        }
+
+        // Get the terms to highlight from the request.
+        $terms = $input->request->get('highlight', null, 'base64');
+        $terms = $terms ? json_decode(base64_decode($terms)) : null;
+
+        // Check the terms.
+        if (empty($terms)) {
+            return;
+        }
+
+        // Clean the terms array.
+        $filter     = InputFilter::getInstance();
+
+        $cleanTerms = [];
+
+        foreach ($terms as $term) {
+            $cleanTerms[] = htmlspecialchars($filter->clean($term, 'string'));
+        }
+
+        /** @var \Joomla\CMS\Document\HtmlDocument $doc */
+        $doc = $event->getApplication()->getDocument();
+
+        // Activate the highlighter.
+        if (!empty($cleanTerms)) {
+            $doc->getWebAssetManager()->useScript('highlight');
+            $doc->addScriptOptions(
+                'highlight',
+                [[
+                    'class'     => 'js-highlight',
+                    'highLight' => $cleanTerms,
+                ]]
+            );
+        }
+
+        // Adjust the component buffer.
+        $buf = $doc->getBuffer('component');
+        $buf = '<div class="js-highlight">' . $buf . '</div>';
+        $doc->setBuffer($buf, 'component');
+    }
+
+    /**
+     * Method to catch the onFinderResult event.
+     *
+     * @param  ResultEvent $event  The event object
+     *
+     * @return  void
+     *
+     * @since   4.0.0
+     */
+    public function onFinderResult(ResultEvent $event): void
+    {
+        static $params;
+
+        if (\is_null($params)) {
+            $params = ComponentHelper::getParams('com_finder');
+        }
+
+        $item  = $event->getItem();
+        $query = $event->getQuery();
+
+        // Get the route with highlighting information.
+        if (
+            !empty($query->highlight)
+            && empty($item->mime)
+            && $params->get('highlight_terms', 1)
+        ) {
+            $uri = new Uri($item->route);
+            $uri->setVar('highlight', base64_encode(json_encode(\array_slice($query->highlight, 0, 10))));
+            $item->route = $uri->toString();
+        }
+    }
+}