Support language tag extensions with multiple subtags for a key

src/i18n.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 // limitations under the License.
 
 #include "src/i18n.h"
 
 #include "src/api.h"
 #include "src/factory.h"
 #include "src/isolate.h"
@@ skipping 139 matching lines @@
   JSObject::SetProperty(
       resolved, factory->intl_pattern_symbol(),
       factory->NewStringFromTwoByte(
                    Vector<const uint16_t>(
                        reinterpret_cast<const uint16_t*>(pattern.getBuffer()),
                        pattern.length())).ToHandleChecked(),
       SLOPPY).Assert();
 
   // Set time zone and calendar.
   const icu::Calendar* calendar = date_format->getCalendar();
+  // getType() returns legacy calendar type name instead of LDML/BCP47 calendar
+  // key values. i18n.js maps them to BCP47 values for key "ca".
+  // TODO(jshin): Consider doing it here, instead.
   const char* calendar_name = calendar->getType();
   JSObject::SetProperty(resolved, factory->NewStringFromStaticChars("calendar"),
                         factory->NewStringFromAsciiChecked(calendar_name),
                         SLOPPY).Assert();
 
   const icu::TimeZone& tz = calendar->getTimeZone();
   icu::UnicodeString time_zone;
   tz.getID(time_zone);
 
   icu::UnicodeString canonical_time_zone;
@@ skipping 785 matching lines @@
 
 void BreakIterator::DeleteBreakIterator(
     const v8::WeakCallbackInfo<void>& data) {
   delete reinterpret_cast<icu::BreakIterator*>(data.GetInternalField(0));
   delete reinterpret_cast<icu::UnicodeString*>(data.GetInternalField(1));
   GlobalHandles::Destroy(reinterpret_cast<Object**>(data.GetParameter()));
 }
 
 }  // namespace internal
 }  // namespace v8