Function PrioritizedMapLanguageIndexes

libs/i18n/localisation.cpp:163–222

}

vector<LanguageIndex> PrioritizedMapLanguageIndexes(vector<LanguageIndex> const regionalLanguageIndexes)
{
  AlternativeMapLanguageHandling const alternativeMapLanguageHandling = UsedAlternativeMapLanguageHandling();

  vector<LanguageIndex> prioritizedMapLanguageIndexes = {};
  vector<LanguageIndex> const mapLanguageIndexes = GetMapLanguageIndexes();

  if (!mapLanguageIndexes.empty() && mapLanguageIndexes.front() == kDefaultNameIndex)
  {
    prioritizedMapLanguageIndexes.push_back(kDefaultNameIndex);
    for (LanguageIndex const regionalLanguageIndex : regionalLanguageIndexes)
      prioritizedMapLanguageIndexes.push_back(regionalLanguageIndex);
  }
  
  LanguageIndex defaultLang = kUnsupportedLanguageIndex;
  if (!regionalLanguageIndexes.empty())
    defaultLang = MatchingRegionalLanguageIndex(regionalLanguageIndexes, mapLanguageIndexes);

  for (LanguageIndex const mapLanguageIndex : mapLanguageIndexes)
  {
    if (alternativeMapLanguageHandling != AlternativeMapLanguageHandling::IgnoreAlternatives ||
        prioritizedMapLanguageIndexes.empty())
    {
      if (alternativeMapLanguageHandling != AlternativeMapLanguageHandling::LocalOnly &&
          find(prioritizedMapLanguageIndexes.begin(), prioritizedMapLanguageIndexes.end(), mapLanguageIndex) ==
              prioritizedMapLanguageIndexes.end())
        prioritizedMapLanguageIndexes.push_back(mapLanguageIndex);

      if (defaultLang != kUnsupportedLanguageIndex && defaultLang == mapLanguageIndex)
      {
        if (mapLanguageIndex != kDefaultNameIndex)
          prioritizedMapLanguageIndexes.push_back(defaultLang);
        prioritizedMapLanguageIndexes.push_back(kDefaultNameIndex);
      }

      if (alternativeMapLanguageHandling != AlternativeMapLanguageHandling::LocalOnly)
      {
        vector<LanguageIndex> const similarMapLanguageIndexes = SimilarLanguageIndexes(mapLanguageIndex);
        prioritizedMapLanguageIndexes.insert(prioritizedMapLanguageIndexes.cend(), similarMapLanguageIndexes.cbegin(),
                                             similarMapLanguageIndexes.cend());
      }
    }
  }

  if (alternativeMapLanguageHandling == AlternativeMapLanguageHandling::LocalOnly)
  {
    LanguageIndex mapLanguageIndex = mapLanguageIndexes.front();
    prioritizedMapLanguageIndexes.push_back(mapLanguageIndex);

    vector<LanguageIndex> const similarLanguageIndexes = SimilarLanguageIndexes(mapLanguageIndex);
    prioritizedMapLanguageIndexes.insert(prioritizedMapLanguageIndexes.cend(), similarLanguageIndexes.cbegin(),
                                         similarLanguageIndexes.cend());
  }

  prioritizedMapLanguageIndexes.push_back(kInternationalNameIndex);
  prioritizedMapLanguageIndexes.push_back(kEnglishLanguageIndex);
  prioritizedMapLanguageIndexes.push_back(kDefaultNameIndex);