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wp-content/plugins/smart-slider-3/Nextend/Framework/Localization/AbstractLocalization.php

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+<?php
+
+namespace Nextend\Framework\Localization;
+
+abstract class AbstractLocalization {
+
+    public function getLocale() {
+        return 'en_US';
+    }
+
+    abstract public function createMo();
+
+    abstract public function createNOOP_Translations();
+}

wp-content/plugins/smart-slider-3/Nextend/Framework/Localization/Functions.php

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+<?php
+
+use Nextend\Framework\Localization\Localization;
+
+function n2_($text, $domain = 'nextend', $escape = true) {
+    $translations = Localization::getTranslationsForDomain($domain);
+
+    if ($escape) {
+        return esc_html($translations->translate($text));
+    } else {
+        return $translations->translate($text);
+    }
+}
+
+function n2_e($text, $domain = 'nextend') {
+    echo esc_html(n2_($text, $domain, false));
+}
+
+function n2_n($single, $plural, $number, $domain = 'nextend') {
+    $translations = Localization::getTranslationsForDomain($domain);
+
+    return $translations->translate_plural($single, $plural, $number);
+}
+
+function n2_en($single, $plural, $number, $domain = 'nextend') {
+    echo esc_html(n2_n($single, $plural, $number, $domain));
+}
+
+function n2_x($text, $context, $domain = 'nextend') {
+    $translations = Localization::getTranslationsForDomain($domain);
+
+    return $translations->translate($text, $context);
+}
+
+function n2_ex($text, $context, $domain = 'nextend') {
+    echo esc_html(n2_x($text, $context, $domain));
+}

wp-content/plugins/smart-slider-3/Nextend/Framework/Localization/Localization.php

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+<?php
+
+namespace Nextend\Framework\Localization;
+
+use Nextend\Framework\Filesystem\Filesystem;
+use Nextend\Framework\Localization\Joomla\JoomlaLocalization;
+use Nextend\Framework\Localization\WordPress\WordPressLocalization;
+use Nextend\Framework\Pattern\SingletonTrait;
+use Nextend\Framework\Platform\Platform;
+use Nextend\Framework\Settings;
+
+class Localization {
+
+    use SingletonTrait;
+
+    /**
+     * @var AbstractLocalization
+     */
+    private static $platformLocalization;
+
+    private static $l10n = array();
+
+    private static $js = array();
+
+    protected function init() {
+
+        require_once dirname(__FILE__) . DIRECTORY_SEPARATOR . 'Functions.php';
+        self::$platformLocalization = new WordPressLocalization();
+    }
+
+    public static function getLocale() {
+        return self::$platformLocalization->getLocale();
+    }
+
+    private static function checkMoFile($path, $locale) {
+        if (Filesystem::fileexists($path . '/' . $locale . '.mo')) return $locale . '.mo';
+
+        if (strpos($locale, '_')) {
+            $nextLangStep = implode('_', explode('_', $locale, -1));
+
+            return self::checkMoFile($path, $nextLangStep);
+        }
+
+        return false;
+
+    }
+
+    private static function loadTextDomain($domain, $mofile) {
+
+        $mo = self::$platformLocalization->createMo();
+        if (!$mo->import_from_file($mofile)) return false;
+
+        if (isset(self::$l10n[$domain])) $mo->merge_with(self::$l10n[$domain]);
+        self::$l10n[$domain] = &$mo;
+
+        return true;
+    }
+
+    public static function loadPluginTextDomain($path, $domain = 'nextend') {
+        if (Platform::isAdmin() && Settings::get('force-english-backend')) {
+            $locale = 'en_EN';
+        } else {
+            $locale = self::getLocale();
+        }
+        $mofile = self::checkMoFile($path, $locale);
+
+        if ($mofile && $loaded = self::loadTextDomain($domain, $path . '/' . $mofile)) {
+            return $loaded;
+        }
+
+        return false;
+    }
+
+    public static function getTranslationsForDomain($domain) {
+        if (!isset(self::$l10n[$domain])) {
+            self::$l10n[$domain] = self::$platformLocalization->createNOOP_Translations();
+        }
+
+        return self::$l10n[$domain];
+    }
+
+    public static function addJS($texts) {
+        foreach ((array)$texts as $text) {
+            self::$js[$text] = n2_($text);
+        }
+    }
+
+    public static function toJS() {
+        if (count(self::$js)) {
+            return '_N2._localization = ' . json_encode(self::$js) . ';';
+        }
+
+        return '';
+    }
+}

wp-content/plugins/smart-slider-3/Nextend/Framework/Localization/WordPress/WordPressLocalization.php

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+<?php
+
+namespace Nextend\Framework\Localization\WordPress;
+
+use Mo;
+use Nextend\Framework\Localization\AbstractLocalization;
+use NOOP_Translations;
+use function get_locale;
+use function get_user_locale;
+use function is_admin;
+
+class WordPressLocalization extends AbstractLocalization {
+
+
+    public function getLocale() {
+
+        return is_admin() && function_exists('\\get_user_locale') ? get_user_locale() : get_locale();
+    }
+
+    public function createMo() {
+
+        require_once ABSPATH . WPINC . '/pomo/mo.php';
+
+        return new MO();
+    }
+
+    public function createNOOP_Translations() {
+
+        require_once ABSPATH . WPINC . '/pomo/mo.php';
+
+        return new NOOP_Translations();
+    }
+}