[core] Add number-format expression

platform/android/src/text/format_number.cpp

@@ -0,0 +1,81 @@
+#include <mbgl/style/expression/collator.hpp>
+#include <mbgl/text/language_tag.hpp>
+#include <mbgl/util/platform.hpp>
+
+#include <jni/jni.hpp>
+
+#include "../attach_env.hpp"
+#include "format_number_jni.hpp"
+
+namespace mbgl {
+namespace android {
+
+void NumberFormat::registerNative(jni::JNIEnv& env) {
+    jni::Class<NumberFormat>::Singleton(env);
+}
+
+jni::Local<jni::Object<NumberFormat>> NumberFormat::getInstance(jni::JNIEnv& env, const jni::Object<Locale>& locale) {
+    static auto& javaClass = jni::Class<NumberFormat>::Singleton(env);
+    static auto method = javaClass.GetStaticMethod<jni::Object<NumberFormat> (jni::Object<Locale>)>(env, "getInstance");
+    return javaClass.Call(env, method, locale);
+}
+
+jni::Local<jni::Object<NumberFormat>> NumberFormat::getCurrencyInstance(jni::JNIEnv& env, const jni::Object<Locale>& locale) {
+    static auto& javaClass = jni::Class<NumberFormat>::Singleton(env);
+    static auto method = javaClass.GetStaticMethod<jni::Object<NumberFormat> (jni::Object<Locale>)>(env, "getCurrencyInstance");
+    return javaClass.Call(env, method, locale);
+}
+
+jni::Local<jni::String> NumberFormat::format(jni::JNIEnv& env, const jni::Object<NumberFormat>& nf, jni::jdouble number) {
+    static auto& javaClass = jni::Class<NumberFormat>::Singleton(env);
+    static auto method = javaClass.GetMethod<jni::String (jni::jdouble)>(env, "format");
+    return nf.Call(env, method, number);
+}
+
+void NumberFormat::setMinimumFractionDigits(jni::JNIEnv& env, const jni::Object<NumberFormat>& nf, jni::jint value) {
+    static auto& javaClass = jni::Class<NumberFormat>::Singleton(env);
+    static auto method = javaClass.GetMethod<void (jni::jint)>(env, "setMinimumFractionDigits");
+    return nf.Call(env, method, value);
+}
+
+void NumberFormat::setMaximumFractionDigits(jni::JNIEnv& env, const jni::Object<NumberFormat>& nf, jni::jint value) {
+    static auto& javaClass = jni::Class<NumberFormat>::Singleton(env);
+    static auto method = javaClass.GetMethod<void (jni::jint)>(env, "setMaximumFractionDigits");
+    return nf.Call(env, method, value);
+}
+
+} // namespace android
+
+namespace platform {
+
+std::string formatNumber(double number, const std::string& localeId, const std::string& currency,
+                         uint8_t minFractionDigits, uint8_t maxFractionDigits) {
+
+    auto env{ android::AttachEnv() };
+
+    jni::Global<jni::Object<android::Locale>> locale;
+    LanguageTag languageTag = !localeId.empty() ? LanguageTag::fromBCP47(localeId) : LanguageTag();
+    if (!languageTag.language) {
+        locale = jni::NewGlobal(*env, android::Locale::getDefault(*env));
+    } else if (!languageTag.region) {
+        locale = jni::NewGlobal(*env, android::Locale::New(*env, jni::Make<jni::String>(*env, *languageTag.language)));
+    } else {
+        locale = jni::NewGlobal(*env, android::Locale::New(*env, jni::Make<jni::String>(*env, *languageTag.language),
+                                                                 jni::Make<jni::String>(*env, *languageTag.region)));
+    }
+
+    jni::Global<jni::Object<android::NumberFormat>> formatter;
+    if (currency.empty()) {
+        formatter = jni::NewGlobal(*env, android::NumberFormat::getInstance(*env, locale));
+        android::NumberFormat::setMinimumFractionDigits(*env, formatter, static_cast<jni::jint>(minFractionDigits));
+        android::NumberFormat::setMaximumFractionDigits(*env, formatter, static_cast<jni::jint>(maxFractionDigits));
+    } else {
+        formatter = jni::NewGlobal(*env, android::NumberFormat::getCurrencyInstance(*env, locale));
+    }
+
+    auto result = android::NumberFormat::format(*env, formatter, static_cast<jni::jdouble>(number));
+    return jni::Make<std::string>(*env, result);
+}
+
+} // namespace platform
+} // namespace mbgl