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Work around a currency service defect for localization (#2302) (#2303)
* always use `lang-region` for localization * language code may have a single segment
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‎src/CalcViewModel/DataLoaders/CurrencyDataLoader.cpp

+103-49
Original file line numberDiff line numberDiff line change
@@ -2,6 +2,8 @@
22
// Licensed under the MIT License.
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#include "pch.h"
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#include <optional>
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#include "CurrencyDataLoader.h"
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#include "Common/AppResourceProvider.h"
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#include "Common/LocalizationStringUtil.h"
@@ -31,41 +33,104 @@ using namespace Windows::System::UserProfile;
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using namespace Windows::UI::Core;
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using namespace Windows::Web::Http;
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34-
static constexpr auto CURRENCY_UNIT_FROM_KEY = L"CURRENCY_UNIT_FROM_KEY";
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static constexpr auto CURRENCY_UNIT_TO_KEY = L"CURRENCY_UNIT_TO_KEY";
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// Calculate number of 100-nanosecond intervals-per-day
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// (1 interval/100 nanosecond)(100 nanosecond/1e-7 s)(60 s/1 min)(60 min/1 hr)(24 hr/1 day) = (interval/day)
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static constexpr long long DAY_DURATION = 1LL * 60 * 60 * 24 * 10000000;
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static constexpr long long WEEK_DURATION = DAY_DURATION * 7;
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static constexpr int FORMATTER_RATE_FRACTION_PADDING = 2;
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static constexpr int FORMATTER_RATE_MIN_DECIMALS = 4;
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static constexpr int FORMATTER_RATE_MIN_SIGNIFICANT_DECIMALS = 4;
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static constexpr auto CACHE_TIMESTAMP_KEY = L"CURRENCY_CONVERTER_TIMESTAMP";
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static constexpr auto CACHE_LANGCODE_KEY = L"CURRENCY_CONVERTER_LANGCODE";
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static constexpr auto CACHE_DELIMITER = L"%";
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static constexpr auto STATIC_DATA_FILENAME = L"CURRENCY_CONVERTER_STATIC_DATA.txt";
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static constexpr array<wstring_view, 5> STATIC_DATA_PROPERTIES = { wstring_view{ L"CountryCode", 11 },
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wstring_view{ L"CountryName", 11 },
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wstring_view{ L"CurrencyCode", 12 },
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wstring_view{ L"CurrencyName", 12 },
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wstring_view{ L"CurrencySymbol", 14 } };
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static constexpr auto ALL_RATIOS_DATA_FILENAME = L"CURRENCY_CONVERTER_ALL_RATIOS_DATA.txt";
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static constexpr auto RATIO_KEY = L"Rt";
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static constexpr auto CURRENCY_CODE_KEY = L"An";
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static constexpr array<wstring_view, 2> ALL_RATIOS_DATA_PROPERTIES = { wstring_view{ RATIO_KEY, 2 }, wstring_view{ CURRENCY_CODE_KEY, 2 } };
61-
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static constexpr auto DEFAULT_FROM_TO_CURRENCY_FILE_URI = L"ms-appx:///DataLoaders/DefaultFromToCurrency.json";
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static constexpr auto FROM_KEY = L"from";
64-
static constexpr auto TO_KEY = L"to";
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namespace
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{
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constexpr auto CURRENCY_UNIT_FROM_KEY = L"CURRENCY_UNIT_FROM_KEY";
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constexpr auto CURRENCY_UNIT_TO_KEY = L"CURRENCY_UNIT_TO_KEY";
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// Calculate number of 100-nanosecond intervals-per-day
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// (1 interval/100 nanosecond)(100 nanosecond/1e-7 s)(60 s/1 min)(60 min/1 hr)(24 hr/1 day) = (interval/day)
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constexpr long long DAY_DURATION = 1LL * 60 * 60 * 24 * 10000000;
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constexpr long long WEEK_DURATION = DAY_DURATION * 7;
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constexpr int FORMATTER_RATE_FRACTION_PADDING = 2;
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constexpr int FORMATTER_RATE_MIN_DECIMALS = 4;
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constexpr int FORMATTER_RATE_MIN_SIGNIFICANT_DECIMALS = 4;
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constexpr auto CACHE_TIMESTAMP_KEY = L"CURRENCY_CONVERTER_TIMESTAMP";
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constexpr auto CACHE_LANGCODE_KEY = L"CURRENCY_CONVERTER_LANGCODE";
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constexpr auto CACHE_DELIMITER = L"%";
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constexpr auto STATIC_DATA_FILENAME = L"CURRENCY_CONVERTER_STATIC_DATA.txt";
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constexpr array<wstring_view, 5> STATIC_DATA_PROPERTIES = { wstring_view{ L"CountryCode", 11 },
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wstring_view{ L"CountryName", 11 },
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wstring_view{ L"CurrencyCode", 12 },
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wstring_view{ L"CurrencyName", 12 },
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wstring_view{ L"CurrencySymbol", 14 } };
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constexpr auto ALL_RATIOS_DATA_FILENAME = L"CURRENCY_CONVERTER_ALL_RATIOS_DATA.txt";
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constexpr auto RATIO_KEY = L"Rt";
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constexpr auto CURRENCY_CODE_KEY = L"An";
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constexpr array<wstring_view, 2> ALL_RATIOS_DATA_PROPERTIES = { wstring_view{ RATIO_KEY, 2 }, wstring_view{ CURRENCY_CODE_KEY, 2 } };
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constexpr auto DEFAULT_FROM_TO_CURRENCY_FILE_URI = L"ms-appx:///DataLoaders/DefaultFromToCurrency.json";
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constexpr auto FROM_KEY = L"from";
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constexpr auto TO_KEY = L"to";
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// Fallback default values.
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constexpr auto DEFAULT_FROM_CURRENCY = DefaultCurrencyCode.data();
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constexpr auto DEFAULT_TO_CURRENCY = L"EUR";
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// ParseLanguageCode returns language code in form of `lang-region`
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// TODO: unit testing.
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std::optional<std::wstring> ParseLanguageCode(const wchar_t* bcp47)
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{
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// the IETF BCP 47 language tag syntax is: language[-script][-region]...
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std::vector<std::wstring> segments;
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std::wstring cur;
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// TODO: use C++20 - ranges::views::split_view in the future.
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for (; *bcp47 != L'\0' && segments.size() < 3; ++bcp47)
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{
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auto ch = *bcp47;
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if (std::isalpha(static_cast<unsigned char>(ch)))
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{
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cur += ch;
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}
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else if (ch == L'-')
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{
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segments.push_back(std::exchange(cur, {}));
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}
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else
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{
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return std::nullopt;
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}
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}
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if (!cur.empty())
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{
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segments.push_back(std::move(cur));
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}
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66-
// Fallback default values.
67-
static constexpr auto DEFAULT_FROM_CURRENCY = DefaultCurrencyCode.data();
68-
static constexpr auto DEFAULT_TO_CURRENCY = L"EUR";
103+
switch (segments.size())
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{
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case 1:
106+
return segments[0];
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case 2:
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if (segments[1].size() == 2)
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{ // segments[1] is a region subtag.
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return segments[0] + L"-" + segments[1];
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}
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else
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{
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return segments[0];
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}
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case 3:
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if (segments[1].size() == 2)
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{ // segments[1] is a region subtag.
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return segments[0] + L"-" + segments[1];
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}
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else if (segments[1].size() != 2 && segments[2].size() == 2)
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{ // segments[2] is a region subtag.
123+
return segments[0] + L"-" + segments[2];
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}
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else
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{
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return segments[0];
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}
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default:
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return std::nullopt;
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}
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}
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} // namespace
69134

70135
namespace CalculatorApp
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{
@@ -99,25 +164,14 @@ CurrencyDataLoader::CurrencyDataLoader(const wchar_t* forcedResponseLanguage)
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{
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if (forcedResponseLanguage != nullptr)
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{
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assert(wcslen(forcedResponseLanguage) > 0 && "forcedResponseLanguage shall not be empty.");
102168
m_responseLanguage = ref new Platform::String(forcedResponseLanguage);
103169
}
104-
else
170+
else if (GlobalizationPreferences::Languages->Size > 0)
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{
106-
if (GlobalizationPreferences::Languages->Size > 0)
107-
{
108-
m_responseLanguage = GlobalizationPreferences::Languages->GetAt(0);
109-
110-
// Workaround for Simplified Chinese localization issue of currency API.
111-
std::wstring_view responseLanguage(m_responseLanguage->Data(), m_responseLanguage->Length());
112-
std::match_results<std::wstring_view::const_iterator> match;
113-
if (std::regex_match(responseLanguage.cbegin(), responseLanguage.cend(), match, std::wregex(L"zh-hans-[a-z]+", std::regex_constants::icase)))
114-
{
115-
m_responseLanguage = L"zh-CN";
116-
}
117-
}
118-
else
172+
if (auto lang = ParseLanguageCode(GlobalizationPreferences::Languages->GetAt(0)->Data()); lang.has_value())
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{
120-
m_responseLanguage = L"en-US";
174+
m_responseLanguage = ref new Platform::String{ lang->c_str() };
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}
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}
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