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language code may have a single segment

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This commit is contained in:
Tian Liao 2025-02-21 16:15:11 +08:00
commit 497f3619d0
1 changed files with 27 additions and 13 deletions
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40
src/CalcViewModel/DataLoaders/CurrencyDataLoader.cpp
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@ -75,7 +75,7 @@ namespace
// TODO: unit testing.
std::optional<std::wstring> ParseLanguageCode(const wchar_t* bcp47)
{
// the IETF BCP 47 language tag syntax is: language[-script][-region][-variant[*][-extension*][-privateuse*]]
// the IETF BCP 47 language tag syntax is: language[-script][-region]...
std::vector<std::wstring> segments;
std::wstring cur;
// TODO: use C++20 - ranges::views::split_view in the future.
@ -102,10 +102,30 @@ namespace
switch (segments.size())
{
case 1:
return segments[0];
case 2:
return segments[0] + L"-" + segments[1];
if (segments[1].size() == 2)
{ // segments[1] is a region subtag.
return segments[0] + L"-" + segments[1];
}
else
{
return segments[0];
}
case 3:
return segments[0] + L"-" + segments[2];
if (segments[1].size() == 2)
{ // segments[1] is a region subtag.
return segments[0] + L"-" + segments[1];
}
else if (segments[1].size() != 2 && segments[2].size() == 2)
{ // segments[2] is a region subtag.
return segments[0] + L"-" + segments[2];
}
else
{
return segments[0];
}
default:
return std::nullopt;
}
@ -144,20 +164,14 @@ CurrencyDataLoader::CurrencyDataLoader(const wchar_t* forcedResponseLanguage)
{
if (forcedResponseLanguage != nullptr)
{
assert(wcslen(forcedResponseLanguage) > 0 && "forcedResponseLanguage shall not be empty.");
m_responseLanguage = ref new Platform::String(forcedResponseLanguage);
}
else
else if (GlobalizationPreferences::Languages->Size > 0)
{
if (GlobalizationPreferences::Languages->Size > 0)
if (auto lang = ParseLanguageCode(GlobalizationPreferences::Languages->GetAt(0)->Data()); lang.has_value())
{
if (auto lang = ParseLanguageCode(GlobalizationPreferences::Languages->GetAt(0)->Data()); lang.has_value())
{
m_responseLanguage = ref new String{ lang->c_str() };
}
}
else
{
m_responseLanguage = L"en-US";
m_responseLanguage = ref new Platform::String{ lang->c_str() };
}
}