[core] Add number-format expression

1 files changed, 35 insertions, 0 deletions

diff --git a/platform/default/src/mbgl/util/format_number.cpp b/platform/default/src/mbgl/util/format_number.cpp
new file mode 100644
index 0000000000..7cc863818a
--- /dev/null
+++ b/platform/default/src/mbgl/util/format_number.cpp
@@ -0,0 +1,35 @@
+#include <mbgl/util/platform.hpp>
+
+#include <unicode/numberformatter.h>
+
+namespace mbgl {
+namespace platform {
+
+std::string formatNumber(double number, const std::string& localeId, const std::string& currency,
+                         uint8_t minFractionDigits, uint8_t maxFractionDigits) {
+
+    UErrorCode status = U_ZERO_ERROR;
+    icu::UnicodeString ustr;
+    std::string formatted;
+
+    icu::Locale locale = icu::Locale(localeId.c_str());
+    // Print the value as currency
+    if (!currency.empty()) {
+        icu::UnicodeString ucurrency = icu::UnicodeString::fromUTF8(currency);
+        ustr = icu::number::NumberFormatter::with()
+                .unit(icu::CurrencyUnit(ucurrency.getBuffer(), status))
+                .locale(locale)
+                .formatDouble(number, status)
+                .toString();
+    } else {
+        ustr = icu::number::NumberFormatter::with()
+                .precision(icu::number::Precision::minMaxFraction(minFractionDigits, maxFractionDigits))
+                .locale(locale)
+                .formatDouble(number, status)
+                .toString();
+    }
+    return ustr.toUTF8String(formatted);
+}
+
+} // namespace platform
+} // namespace mbgl