[Intl] Add ResourceBundle and RelativeDateTimeFormatter to GetAvailableLocales

R=bstell@chromium.org, cira@chromium.org, yangguo@chromium.org

Bug: v8:7869
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: Ia7176016ecd6da317b3b0eb7af7bf482f99c8129
Reviewed-on: https://chromium-review.googlesource.com/1121657
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Jungshik Shin <jshin@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54382}

src/intl.h

@@ -28,7 +28,9 @@ enum class IcuService {
   kCollator,
   kDateFormat,
   kNumberFormat,
-  kPluralRules
+  kPluralRules,
+  kResourceBundle,
+  kRelativeDateTimeFormatter
 };
 
 const UChar* GetUCharBufferFromFlat(const String::FlatContent& flat,

src/objects/intl-objects.cc

@@ -42,6 +42,7 @@
 #include "unicode/ucurr.h"
 #include "unicode/unum.h"
 #include "unicode/upluralrules.h"
+#include "unicode/ures.h"
 #include "unicode/uvernum.h"
 #include "unicode/uversion.h"
 
@@ -1103,6 +1104,7 @@ bool Intl::RemoveLocaleScriptTag(const std::string& icu_locale,
 std::set<std::string> Intl::GetAvailableLocales(const IcuService& service) {
   const icu::Locale* icu_available_locales = nullptr;
   int32_t count = 0;
+  std::set<std::string> locales;
 
   switch (service) {
     case IcuService::kBreakIterator:
@@ -1125,12 +1127,48 @@ std::set<std::string> Intl::GetAvailableLocales(const IcuService& service) {
       // https://ssl.icu-project.org/trac/ticket/12756
       icu_available_locales = icu::Locale::getAvailableLocales(count);
       break;
+    case IcuService::kResourceBundle: {
+      UErrorCode status = U_ZERO_ERROR;
+      UEnumeration* en = ures_openAvailableLocales(nullptr, &status);
+      int32_t length = 0;
+      const char* locale_str = uenum_next(en, &length, &status);
+      while (U_SUCCESS(status) && (locale_str != nullptr)) {
+        std::string locale(locale_str, length);
+        std::replace(locale.begin(), locale.end(), '_', '-');
+        locales.insert(locale);
+        std::string shortened_locale;
+        if (Intl::RemoveLocaleScriptTag(locale_str, &shortened_locale)) {
+          std::replace(shortened_locale.begin(), shortened_locale.end(), '_',
+                       '-');
+          locales.insert(shortened_locale);
+        }
+        locale_str = uenum_next(en, &length, &status);
+      }
+      uenum_close(en);
+      return locales;
+    }
+    case IcuService::kRelativeDateTimeFormatter: {
+      // ICU RelativeDateTimeFormatter does not provide a getAvailableLocales()
+      // interface, because RelativeDateTimeFormatter depends on
+      // 1. NumberFormat and 2. ResourceBundle, return the
+      // intersection of these two set.
+      // ICU FR at https://unicode-org.atlassian.net/browse/ICU-20009
+      // TODO(ftang): change to call ICU's getAvailableLocales() after it is
+      // added.
+      std::set<std::string> number_format_set(
+          Intl::GetAvailableLocales(IcuService::kNumberFormat));
+      std::set<std::string> resource_bundle_set(
+          Intl::GetAvailableLocales(IcuService::kResourceBundle));
+      set_intersection(resource_bundle_set.begin(), resource_bundle_set.end(),
+                       number_format_set.begin(), number_format_set.end(),
+                       std::inserter(locales, locales.begin()));
+      return locales;
+    }
   }
 
   UErrorCode error = U_ZERO_ERROR;
   char result[ULOC_FULLNAME_CAPACITY];
 
-  std::set<std::string> locales;
   for (int32_t i = 0; i < count; ++i) {
     const char* icu_name = icu_available_locales[i].getName();
 

test/cctest/test-intl.cc

@@ -248,6 +248,12 @@ TEST(GetAvailableLocales) {
 
   locales = Intl::GetAvailableLocales(IcuService::kPluralRules);
   CHECK(locales.count("en-US"));
+
+  locales = Intl::GetAvailableLocales(IcuService::kResourceBundle);
+  CHECK(locales.count("en-US"));
+
+  locales = Intl::GetAvailableLocales(IcuService::kRelativeDateTimeFormatter);
+  CHECK(locales.count("en-US"));
 }
 
 TEST(IsObjectOfType) {