File indexing completed on 2024-05-19 04:56:13

 /**
  * \file loadtranslation.cpp
  * Load application translation.
  *
  * \b Project: Kid3
  * \author Urs Fleisch
  * \date 26 Mar 2013
  *
  * Copyright (C) 2013-2024  Urs Fleisch
  *
  * This file is part of Kid3.
  *
  * Kid3 is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * Kid3 is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #include "loadtranslation.h"
 #include <QCoreApplication>
 #include <QStringList>
 #include <QLibraryInfo>
 #include <QLocale>
 #include <QTranslator>
 #include <QFileInfo>
 #include <QDir>
 #include "config.h"
 
 namespace {
 
 const char* const QT_TRANSLATION_PREFIX = "qtbase_";
 
 }
 
 /**
  * @brief Load application translation.
  *
  * @param lang preferred language, if not set, the language is determined by
  * the system configuration
  */
 void Utils::loadTranslation(const QString& lang)
 {
   QLocale locale;
 
   QStringList languages(
 #ifndef Q_OS_WIN32
         locale.uiLanguages()
 #else
         locale.name()
 #endif
         );
   if (!lang.isEmpty()) {
     languages.prepend(lang);
   }
 
   // Fix the translations returned from QLocale::uiLanguages() if '_' or '@'
   // have been replaced by '-'. "zh_CN" is returned as "zh-CN", "sr@latin" as
   // "sr-latin". Both "sr@ijekavian" and "sr@ijekavianlatin" give "sr-ijekavia",
   // so this case cannot be fixed.
   for (auto it = languages.begin(); it != languages.end(); ++it) {
     const int len = it->length();
     if (const int dashPos = it->lastIndexOf(QLatin1Char('-'));
         dashPos > 0 && dashPos < len -1) {
       (*it)[dashPos] = QLatin1Char(dashPos == len - 3 ? '_' : '@');
     }
     // Some more fixes for languages encountered on macOS,
     // e.g. "sr-Latn_SP", "zh-Hant_TW".
     it->replace(QLatin1String("@Latn"), QLatin1String("@latin"))
         .replace(QLatin1String("-Latn"), QLatin1String("@latin"))
         .remove(QLatin1String("-Hant"))
         .remove(QLatin1String("-Hans"));
   }
 
   QString translationsDir;
 #ifdef CFG_TRANSLATIONSDIR
   translationsDir = QLatin1String(CFG_TRANSLATIONSDIR);
   prependApplicationDirPathIfRelative(translationsDir);
 #endif
 
   // '-' is added to default delimiters because it is used on Mac OS X instead
   // of '_'.
   const QString searchDelimiters(QLatin1String("_.-"));
 
   // translation file for Qt
   auto qtTr = new QTranslator(qApp);
   const auto localeNames = languages;
   for (const QString& localeName : localeNames) {
     if (
         localeName.startsWith(QLatin1String("en")) ||
         (!translationsDir.isNull() &&
          qtTr->load(QLatin1String(QT_TRANSLATION_PREFIX) + localeName,
                     translationsDir, searchDelimiters)) ||
         qtTr->load(QLatin1String(QT_TRANSLATION_PREFIX) + localeName,
                    QLatin1String("."), searchDelimiters)
 #if !(defined Q_OS_WIN32 || defined Q_OS_MAC || defined Q_OS_ANDROID)
         || qtTr->load(QLatin1String(QT_TRANSLATION_PREFIX) + localeName,
 #if QT_VERSION >= 0x060000
                    QLibraryInfo::path(QLibraryInfo::TranslationsPath),
 #else
                    QLibraryInfo::location(QLibraryInfo::TranslationsPath),
 #endif
                    searchDelimiters)
 #endif
         ) {
       break;
     }
   }
   qApp->installTranslator(qtTr);
 
   // translation file for application strings
   auto kid3Tr = new QTranslator(qApp);
   for (const QString& localeName : localeNames) {
     if (
         (!translationsDir.isNull() &&
          kid3Tr->load(QLatin1String("kid3_") + localeName, translationsDir,
                       searchDelimiters)) ||
         kid3Tr->load(QLatin1String("kid3_") + localeName, QLatin1String("."),
                      searchDelimiters) ||
         localeName.startsWith(QLatin1String("en"))
         ) {
       break;
     }
   }
   qApp->installTranslator(kid3Tr);
 }
 
 /**
  * Prepend the application directory path to a path if it is relative.
  *
  * @param path file or directory path, will be modified if relative
  */
 void Utils::prependApplicationDirPathIfRelative(QString& path)
 {
   if (QFileInfo(path).isRelative()) {
     if (QString appDir = QCoreApplication::applicationDirPath();
         !appDir.isEmpty()) {
       if (!appDir.endsWith(QLatin1Char('/'))) {
         appDir.append(QLatin1Char('/'));
       }
       path.prepend(appDir);
     }
   }
 }
 
 /**
  * Load list of available translations.
  * @return language codes of installed translations, e.g. {"de", "en", ...}.
  */
 QStringList Utils::availableTranslations()
 {
   QString translationsDir;
 #ifdef CFG_TRANSLATIONSDIR
   translationsDir = QLatin1String(CFG_TRANSLATIONSDIR);
   prependApplicationDirPathIfRelative(translationsDir);
 #endif
   QDir dir(translationsDir);
   const QStringList fileNames = dir.entryList({QLatin1String("kid3_*.qm")},
                                               QDir::Files, QDir::Name);
   QStringList languages;
   for (const auto& fileName : fileNames) {
     languages.append(fileName.mid(5, fileName.length() - 8));
   }
   return languages;
 }