[Intl] Clean up Intl::GetStringOption

Add a templates: Intl::GetStringOptionTo<> to simplify the reading
of string from options.
Add GetCaseFirst and GetHourCycle into Intl for later reuse
by different Intl objects
Move some enum shared by Intl object into Intl::

Bug: v8:5751
Cq-Include-Trybots: luci.v8.try:v8_linux_noi18n_rel_ng
Change-Id: If9ed1889a594f7c0ee6669b4679dda9169e4a771
Reviewed-on: https://chromium-review.googlesource.com/c/1297772Reviewed-by: Adam Klein <adamk@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57201}

src/objects/intl-objects.cc

@@ -1954,21 +1954,33 @@ base::TimezoneCache* Intl::CreateTimeZoneCache() {
                                 : base::OS::CreateTimezoneCache();
 }
 
+Maybe<Intl::CaseFirst> Intl::GetCaseFirst(Isolate* isolate,
+                                          Handle<JSReceiver> options,
+                                          const char* method) {
+  return Intl::GetStringOption<Intl::CaseFirst>(
+      isolate, options, "caseFirst", method, {"upper", "lower", "false"},
+      {Intl::CaseFirst::kUpper, Intl::CaseFirst::kLower,
+       Intl::CaseFirst::kFalse},
+      Intl::CaseFirst::kUndefined);
+}
+
+Maybe<Intl::HourCycle> Intl::GetHourCycle(Isolate* isolate,
+                                          Handle<JSReceiver> options,
+                                          const char* method) {
+  return Intl::GetStringOption<Intl::HourCycle>(
+      isolate, options, "hourCycle", method, {"h11", "h12", "h23", "h24"},
+      {Intl::HourCycle::kH11, Intl::HourCycle::kH12, Intl::HourCycle::kH23,
+       Intl::HourCycle::kH24},
+      Intl::HourCycle::kUndefined);
+}
+
 Maybe<Intl::MatcherOption> Intl::GetLocaleMatcher(Isolate* isolate,
                                                   Handle<JSReceiver> options,
                                                   const char* method) {
-  const std::vector<const char*> values = {"lookup", "best fit"};
-  std::unique_ptr<char[]> matcher_str = nullptr;
-  Maybe<bool> found_matcher = Intl::GetStringOption(
-      isolate, options, "localeMatcher", values, method, &matcher_str);
-  MAYBE_RETURN(found_matcher, Nothing<Intl::MatcherOption>());
-  if (found_matcher.FromJust()) {
-    DCHECK_NOT_NULL(matcher_str.get());
-    if (strcmp(matcher_str.get(), "lookup") == 0) {
-      return Just(Intl::MatcherOption::kLookup);
-    }
-  }
-  return Just(Intl::MatcherOption::kBestFit);
+  return Intl::GetStringOption<Intl::MatcherOption>(
+      isolate, options, "localeMatcher", method, {"best fit", "lookup"},
+      {Intl::MatcherOption::kLookup, Intl::MatcherOption::kBestFit},
+      Intl::MatcherOption::kLookup);
 }
 
 }  // namespace internal

src/objects/intl-objects.h

@@ -81,6 +81,32 @@ class Intl {
       std::vector<const char*> values, const char* service,
       std::unique_ptr<char[]>* result);
 
+  // A helper template to get string from option into a enum.
+  // The enum in the enum_values is the corresponding value to the strings
+  // in the str_values. If the option does not contains name,
+  // default_value will be return.
+  template <typename T>
+  V8_WARN_UNUSED_RESULT static Maybe<T> GetStringOption(
+      Isolate* isolate, Handle<JSReceiver> options, const char* name,
+      const char* method, const std::vector<const char*>& str_values,
+      const std::vector<T>& enum_values, T default_value) {
+    DCHECK_EQ(str_values.size(), enum_values.size());
+    std::unique_ptr<char[]> cstr;
+    Maybe<bool> found = Intl::GetStringOption(isolate, options, name,
+                                              str_values, method, &cstr);
+    MAYBE_RETURN(found, Nothing<T>());
+    if (found.FromJust()) {
+      DCHECK_NOT_NULL(cstr.get());
+      for (size_t i = 0; i < str_values.size(); i++) {
+        if (strcmp(cstr.get(), str_values[i]) == 0) {
+          return Just(enum_values[i]);
+        }
+      }
+      UNREACHABLE();
+    }
+    return Just(default_value);
+  }
+
   // ECMA402 9.2.10. GetOption( options, property, type, values, fallback)
   // ecma402/#sec-getoption
   //
@@ -189,7 +215,26 @@ class Intl {
       Isolate* isolate, Handle<String> service, Handle<Object> locales,
       Handle<Object> options, Handle<Object> internal_options);
 
-  enum MatcherOption { kBestFit, kLookup };
+  // enum for "caseFirst" option: shared by Intl.Locale and Intl.Collator.
+  enum class CaseFirst { kUpper, kLower, kFalse, kUndefined };
+
+  // Shared function to read the "caseFirst" option.
+  V8_WARN_UNUSED_RESULT static Maybe<CaseFirst> GetCaseFirst(
+      Isolate* isolate, Handle<JSReceiver> options, const char* method);
+
+  // enum for "hourCycle" option: shared by Intl.Locale and Intl.DateTimeFormat.
+  enum class HourCycle { kH11, kH12, kH23, kH24, kUndefined };
+
+  // Shared function to read the "hourCycle" option.
+  V8_WARN_UNUSED_RESULT static Maybe<HourCycle> GetHourCycle(
+      Isolate* isolate, Handle<JSReceiver> options, const char* method);
+
+  // enum for "localeMatcher" option: shared by many Intl objects.
+  enum class MatcherOption { kBestFit, kLookup };
+
+  // Shared function to read the "localeMatcher" option.
+  V8_WARN_UNUSED_RESULT static Maybe<MatcherOption> GetLocaleMatcher(
+      Isolate* isolate, Handle<JSReceiver> options, const char* method);
 
   struct ResolvedLocale {
     std::string locale;
@@ -202,10 +247,6 @@ class Intl {
       const std::vector<std::string>& requested_locales, MatcherOption options,
       const std::set<std::string>& relevant_extension_keys);
 
-  // Shared function to read the "localeMatcher" option.
-  V8_WARN_UNUSED_RESULT static Maybe<MatcherOption> GetLocaleMatcher(
-      Isolate* isolate, Handle<JSReceiver> options, const char* method);
-
   // Utility function to set text to BreakIterator.
   static Managed<icu::UnicodeString>* SetTextToBreakIterator(
       Isolate* isolate, Handle<String> text,

src/objects/js-break-iterator.cc

@@ -15,14 +15,6 @@
 namespace v8 {
 namespace internal {
 
-JSV8BreakIterator::Type JSV8BreakIterator::getType(const char* str) {
-  if (strcmp(str, "character") == 0) return Type::CHARACTER;
-  if (strcmp(str, "word") == 0) return Type::WORD;
-  if (strcmp(str, "sentence") == 0) return Type::SENTENCE;
-  if (strcmp(str, "line") == 0) return Type::LINE;
-  UNREACHABLE();
-}
-
 MaybeHandle<JSV8BreakIterator> JSV8BreakIterator::Initialize(
     Isolate* isolate, Handle<JSV8BreakIterator> break_iterator_holder,
     Handle<Object> locales, Handle<Object> options_obj) {
@@ -56,17 +48,12 @@ MaybeHandle<JSV8BreakIterator> JSV8BreakIterator::Initialize(
                           requested_locales, matcher, {});
 
   // Extract type from options
-  std::unique_ptr<char[]> type_str = nullptr;
-  std::vector<const char*> type_values = {"character", "word", "sentence",
-                                          "line"};
-  Maybe<bool> maybe_found_type = Intl::GetStringOption(
-      isolate, options, "type", type_values, "Intl.v8BreakIterator", &type_str);
-  Type type_enum = Type::WORD;
-  MAYBE_RETURN(maybe_found_type, MaybeHandle<JSV8BreakIterator>());
-  if (maybe_found_type.FromJust()) {
-    DCHECK_NOT_NULL(type_str.get());
-    type_enum = getType(type_str.get());
-  }
+  Maybe<Type> maybe_type = Intl::GetStringOption<Type>(
+      isolate, options, "type", "Intl.v8BreakIterator",
+      {"word", "character", "sentence", "line"},
+      {Type::WORD, Type::CHARACTER, Type::SENTENCE, Type::LINE}, Type::WORD);
+  MAYBE_RETURN(maybe_type, MaybeHandle<JSV8BreakIterator>());
+  Type type_enum = maybe_type.FromJust();
 
   icu::Locale icu_locale = r.icu_locale;
   DCHECK(!icu_locale.isBogus());

src/objects/js-break-iterator.h

@@ -88,8 +88,6 @@ class JSV8BreakIterator : public JSObject {
 #undef BREAK_ITERATOR_FIELDS
 
  private:
-  static Type getType(const char* str);
-
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSV8BreakIterator)
 };
 

src/objects/js-collator.cc

@@ -27,6 +27,14 @@ enum class Usage {
   SEARCH,
 };
 
+enum class Sensitivity {
+  kBase,
+  kAccent,
+  kCase,
+  kVariant,
+  kUndefined,
+};
+
 // TODO(gsathya): Consider internalizing the value strings.
 void CreateDataPropertyForOptions(Isolate* isolate, Handle<JSObject> options,
                                   Handle<String> key, const char* value) {
@@ -208,17 +216,31 @@ Handle<JSObject> JSCollator::ResolvedOptions(Isolate* isolate,
 
 namespace {
 
-void SetCaseFirstOption(icu::Collator* icu_collator, const char* value) {
+Intl::CaseFirst ToCaseFirst(const char* str) {
+  if (strcmp(str, "upper") == 0) return Intl::CaseFirst::kUpper;
+  if (strcmp(str, "lower") == 0) return Intl::CaseFirst::kLower;
+  if (strcmp(str, "false") == 0) return Intl::CaseFirst::kFalse;
+  return Intl::CaseFirst::kUndefined;
+}
+
+UColAttributeValue ToUColAttributeValue(Intl::CaseFirst case_first) {
+  switch (case_first) {
+    case Intl::CaseFirst::kUpper:
+      return UCOL_UPPER_FIRST;
+    case Intl::CaseFirst::kLower:
+      return UCOL_LOWER_FIRST;
+    case Intl::CaseFirst::kFalse:
+    case Intl::CaseFirst::kUndefined:
+      return UCOL_OFF;
+  }
+}
+
+void SetCaseFirstOption(icu::Collator* icu_collator,
+                        Intl::CaseFirst case_first) {
   CHECK_NOT_NULL(icu_collator);
-  CHECK_NOT_NULL(value);
   UErrorCode status = U_ZERO_ERROR;
-  if (strcmp(value, "upper") == 0) {
-    icu_collator->setAttribute(UCOL_CASE_FIRST, UCOL_UPPER_FIRST, status);
-  } else if (strcmp(value, "lower") == 0) {
-    icu_collator->setAttribute(UCOL_CASE_FIRST, UCOL_LOWER_FIRST, status);
-  } else {
-    icu_collator->setAttribute(UCOL_CASE_FIRST, UCOL_OFF, status);
-  }
+  icu_collator->setAttribute(UCOL_CASE_FIRST, ToUColAttributeValue(case_first),
+                             status);
   CHECK(U_SUCCESS(status));
 }
 
@@ -253,19 +275,11 @@ MaybeHandle<JSCollator> JSCollator::Initialize(Isolate* isolate,
 
   // 4. Let usage be ? GetOption(options, "usage", "string", « "sort",
   // "search" », "sort").
-  std::vector<const char*> values = {"sort", "search"};
-  std::unique_ptr<char[]> usage_str = nullptr;
-  Usage usage = Usage::SORT;
-  Maybe<bool> found_usage = Intl::GetStringOption(
-      isolate, options, "usage", values, "Intl.Collator", &usage_str);
-  MAYBE_RETURN(found_usage, MaybeHandle<JSCollator>());
-
-  if (found_usage.FromJust()) {
-    DCHECK_NOT_NULL(usage_str.get());
-    if (strcmp(usage_str.get(), "search") == 0) {
-      usage = Usage::SEARCH;
-    }
-  }
+  Maybe<Usage> maybe_usage = Intl::GetStringOption<Usage>(
+      isolate, options, "usage", "Intl.Collator", {"sort", "search"},
+      {Usage::SORT, Usage::SEARCH}, Usage::SORT);
+  MAYBE_RETURN(maybe_usage, MaybeHandle<JSCollator>());
+  Usage usage = maybe_usage.FromJust();
 
   // 9. Let matcher be ? GetOption(options, "localeMatcher", "string",
   // « "lookup", "best fit" », "best fit").
@@ -292,12 +306,10 @@ MaybeHandle<JSCollator> JSCollator::Initialize(Isolate* isolate,
 
   // 14. Let caseFirst be ? GetOption(options, "caseFirst", "string",
   //     « "upper", "lower", "false" », undefined).
-  // 15. Set opt.[[kf]] to caseFirst.
-  values = {"upper", "lower", "false"};
-  std::unique_ptr<char[]> case_first_str = nullptr;
-  Maybe<bool> found_case_first = Intl::GetStringOption(
-      isolate, options, "caseFirst", values, "Intl.Collator", &case_first_str);
-  MAYBE_RETURN(found_case_first, MaybeHandle<JSCollator>());
+  Maybe<Intl::CaseFirst> maybe_case_first =
+      Intl::GetCaseFirst(isolate, options, "Intl.Collator");
+  MAYBE_RETURN(maybe_case_first, MaybeHandle<JSCollator>());
+  Intl::CaseFirst case_first = maybe_case_first.FromJust();
 
   // The relevant unicode extensions accepted by Collator as specified here:
   // https://tc39.github.io/ecma402/#sec-intl-collator-internal-slots
@@ -420,14 +432,13 @@ MaybeHandle<JSCollator> JSCollator::Initialize(Isolate* isolate,
   // If the caseFirst value is passed in through the options object,
   // then we use it. Otherwise, we check if the caseFirst value is
   // passed in through the unicode extensions.
-  if (found_case_first.FromJust()) {
-    const char* case_first_cstr = case_first_str.get();
-    SetCaseFirstOption(icu_collator.get(), case_first_cstr);
+  if (case_first != Intl::CaseFirst::kUndefined) {
+    SetCaseFirstOption(icu_collator.get(), case_first);
   } else {
     auto kf_extension_it = extensions.find("kf");
     if (kf_extension_it != extensions.end()) {
       const std::string& value = kf_extension_it->second;
-      SetCaseFirstOption(icu_collator.get(), value.c_str());
+      SetCaseFirstOption(icu_collator.get(), ToCaseFirst(value.c_str()));
     }
   }
 
@@ -440,40 +451,42 @@ MaybeHandle<JSCollator> JSCollator::Initialize(Isolate* isolate,
 
   // 24. Let sensitivity be ? GetOption(options, "sensitivity",
   // "string", « "base", "accent", "case", "variant" », undefined).
-  values = {"base", "accent", "case", "variant"};
-  std::unique_ptr<char[]> sensitivity_str = nullptr;
-  Maybe<bool> found_sensitivity =
-      Intl::GetStringOption(isolate, options, "sensitivity", values,
-                            "Intl.Collator", &sensitivity_str);
-  MAYBE_RETURN(found_sensitivity, MaybeHandle<JSCollator>());
+  Maybe<Sensitivity> maybe_sensitivity = Intl::GetStringOption<Sensitivity>(
+      isolate, options, "sensitivity", "Intl.Collator",
+      {"base", "accent", "case", "variant"},
+      {Sensitivity::kBase, Sensitivity::kAccent, Sensitivity::kCase,
+       Sensitivity::kVariant},
+      Sensitivity::kUndefined);
+  MAYBE_RETURN(maybe_sensitivity, MaybeHandle<JSCollator>());
+  Sensitivity sensitivity = maybe_sensitivity.FromJust();
 
   // 25. If sensitivity is undefined, then
-  if (!found_sensitivity.FromJust()) {
+  if (sensitivity == Sensitivity::kUndefined) {
     // 25. a. If usage is "sort", then
     if (usage == Usage::SORT) {
       // 25. a. i. Let sensitivity be "variant".
-      // 26. Set collator.[[Sensitivity]] to sensitivity.
-      icu_collator->setStrength(icu::Collator::TERTIARY);
+      sensitivity = Sensitivity::kVariant;
     }
-  } else {
-    DCHECK(found_sensitivity.FromJust());
-    const char* sensitivity_cstr = sensitivity_str.get();
-    DCHECK_NOT_NULL(sensitivity_cstr);
-
-    // 26. Set collator.[[Sensitivity]] to sensitivity.
-    if (strcmp(sensitivity_cstr, "base") == 0) {
+  }
+  // 26. Set collator.[[Sensitivity]] to sensitivity.
+  switch (sensitivity) {
+    case Sensitivity::kBase:
       icu_collator->setStrength(icu::Collator::PRIMARY);
-    } else if (strcmp(sensitivity_cstr, "accent") == 0) {
+      break;
+    case Sensitivity::kAccent:
       icu_collator->setStrength(icu::Collator::SECONDARY);
-    } else if (strcmp(sensitivity_cstr, "case") == 0) {
+      break;
+    case Sensitivity::kCase:
       icu_collator->setStrength(icu::Collator::PRIMARY);
       status = U_ZERO_ERROR;
       icu_collator->setAttribute(UCOL_CASE_LEVEL, UCOL_ON, status);
       CHECK(U_SUCCESS(status));
-    } else {
-      DCHECK_EQ(0, strcmp(sensitivity_cstr, "variant"));
+      break;
+    case Sensitivity::kVariant:
       icu_collator->setStrength(icu::Collator::TERTIARY);
-    }
+      break;
+    case Sensitivity::kUndefined:
+      break;
   }
 
   // 27.Let ignorePunctuation be ? GetOption(options,

src/objects/js-date-time-format.cc

@@ -785,16 +785,17 @@ MaybeHandle<JSDateTimeFormat> JSDateTimeFormat::Initialize(
 
   // 7. Let hourCycle be ? GetOption(options, "hourCycle", "string", « "h11",
   // "h12", "h23", "h24" », undefined).
-  const std::vector<const char*> hour_cycle_values{"h11", "h12", "h23", "h24"};
-  std::unique_ptr<char[]> hour_cycle = nullptr;
-  Maybe<bool> maybe_hour_cycle =
-      Intl::GetStringOption(isolate, options, "hourCycle", hour_cycle_values,
-                            "Intl.DateTimeFormat", &hour_cycle);
-  MAYBE_RETURN(maybe_hour_cycle, Handle<JSDateTimeFormat>());
+  Maybe<Intl::HourCycle> maybe_hour_cycle =
+      Intl::GetHourCycle(isolate, options, "Intl.DateTimeFormat");
+  MAYBE_RETURN(maybe_hour_cycle, MaybeHandle<JSDateTimeFormat>());
+  // TODO(ftang): uncomment the following line and handle hour_cycle.
+  // Intl::HourCycle hour_cycle = maybe_hour_cycle.FromJust();
+
   // 8. If hour12 is not undefined, then
   if (maybe_get_hour12.FromJust()) {
     // a. Let hourCycle be null.
-    hour_cycle = nullptr;
+    // TODO(ftang): uncomment the following line and handle hour_cycle.
+    // hour_cycle = Intl::HourCycle::kUndefined;
   }
   // 9. Set opt.[[hc]] to hourCycle.
   // TODO(ftang): change behavior based on hour_cycle.
@@ -838,20 +839,20 @@ MaybeHandle<JSDateTimeFormat> JSDateTimeFormat::Initialize(
     }
   }
 
+  enum FormatMatcherOption { kBestFit, kBasic };
   // We implement only best fit algorithm, but still need to check
   // if the formatMatcher values are in range.
   // 25. Let matcher be ? GetOption(options, "formatMatcher", "string",
   //     «  "basic", "best fit" », "best fit").
-  Handle<JSReceiver> options_obj;
-  ASSIGN_RETURN_ON_EXCEPTION(isolate, options_obj,
-                             Object::ToObject(isolate, options),
-                             JSDateTimeFormat);
-  std::unique_ptr<char[]> matcher_str = nullptr;
-  std::vector<const char*> matcher_values = {"basic", "best fit"};
-  Maybe<bool> maybe_found_matcher = Intl::GetStringOption(
-      isolate, options_obj, "formatMatcher", matcher_values,
-      "Intl.DateTimeFormat", &matcher_str);
-  MAYBE_RETURN(maybe_found_matcher, Handle<JSDateTimeFormat>());
+  Maybe<FormatMatcherOption> maybe_format_matcher =
+      Intl::GetStringOption<FormatMatcherOption>(
+          isolate, options, "formatMatcher", "Intl.DateTimeFormat",
+          {"best fit", "basic"},
+          {FormatMatcherOption::kBestFit, FormatMatcherOption::kBasic},
+          FormatMatcherOption::kBestFit);
+  MAYBE_RETURN(maybe_format_matcher, MaybeHandle<JSDateTimeFormat>());
+  // TODO(ftang): uncomment the following line and handle format_matcher.
+  // FormatMatcherOption format_matcher = maybe_format_matcher.FromJust();
 
   std::unique_ptr<icu::SimpleDateFormat> date_format(
       CreateICUDateFormat(isolate, icu_locale, skeleton));

src/objects/js-list-format.cc

@@ -150,32 +150,24 @@ MaybeHandle<JSListFormat> JSListFormat::Initialize(
 
   // 7. Let t be GetOption(options, "type", "string", «"conjunction",
   //    "disjunction", "unit"», "conjunction").
-  std::unique_ptr<char[]> type_str = nullptr;
-  std::vector<const char*> type_values = {"conjunction", "disjunction", "unit"};
-  Maybe<bool> maybe_found_type = Intl::GetStringOption(
-      isolate, options, "type", type_values, "Intl.ListFormat", &type_str);
-  Type type_enum = Type::CONJUNCTION;
-  MAYBE_RETURN(maybe_found_type, MaybeHandle<JSListFormat>());
-  if (maybe_found_type.FromJust()) {
-    DCHECK_NOT_NULL(type_str.get());
-    type_enum = get_type(type_str.get());
-  }
+  Maybe<Type> maybe_type = Intl::GetStringOption<Type>(
+      isolate, options, "type", "Intl.ListFormat",
+      {"conjunction", "disjunction", "unit"},
+      {Type::CONJUNCTION, Type::DISJUNCTION, Type::UNIT}, Type::CONJUNCTION);
+  MAYBE_RETURN(maybe_type, MaybeHandle<JSListFormat>());
+  Type type_enum = maybe_type.FromJust();
 
   // 8. Set listFormat.[[Type]] to t.
   list_format->set_type(type_enum);
 
   // 9. Let s be ? GetOption(options, "style", "string",
   //                          «"long", "short", "narrow"», "long").
-  std::unique_ptr<char[]> style_str = nullptr;
-  std::vector<const char*> style_values = {"long", "short", "narrow"};
-  Maybe<bool> maybe_found_style = Intl::GetStringOption(
-      isolate, options, "style", style_values, "Intl.ListFormat", &style_str);
-  Style style_enum = Style::LONG;
-  MAYBE_RETURN(maybe_found_style, MaybeHandle<JSListFormat>());
-  if (maybe_found_style.FromJust()) {
-    DCHECK_NOT_NULL(style_str.get());
-    style_enum = get_style(style_str.get());
-  }
+  Maybe<Style> maybe_style = Intl::GetStringOption<Style>(
+      isolate, options, "style", "Intl.ListFormat", {"long", "short", "narrow"},
+      {Style::LONG, Style::SHORT, Style::NARROW}, Style::LONG);
+  MAYBE_RETURN(maybe_style, MaybeHandle<JSListFormat>());
+  Style style_enum = maybe_style.FromJust();
+
   // 10. Set listFormat.[[Style]] to s.
   list_format->set_style(style_enum);
 

src/objects/js-number-format.cc

@@ -27,6 +27,20 @@ namespace internal {
 
 namespace {
 
+UNumberFormatStyle ToNumberFormatStyle(
+    JSNumberFormat::CurrencyDisplay currency_display) {
+  switch (currency_display) {
+    case JSNumberFormat::CurrencyDisplay::SYMBOL:
+      return UNUM_CURRENCY;
+    case JSNumberFormat::CurrencyDisplay::CODE:
+      return UNUM_CURRENCY_ISO;
+    case JSNumberFormat::CurrencyDisplay::NAME:
+      return UNUM_CURRENCY_PLURAL;
+    case JSNumberFormat::CurrencyDisplay::COUNT:
+      UNREACHABLE();
+  }
+}
+
 // ecma-402/#sec-currencydigits
 // The currency is expected to an all upper case string value.
 int CurrencyDigits(const icu::UnicodeString& currency) {
@@ -277,21 +291,11 @@ MaybeHandle<JSNumberFormat> JSNumberFormat::Initialize(
   // 12. Let style be ? GetOption(options, "style", "string",  « "decimal",
   // "percent", "currency" », "decimal").
   const char* service = "Intl.NumberFormat";
-  std::unique_ptr<char[]> style_cstr;
-  const std::vector<const char*> style_values = {"decimal", "percent",
-                                                 "currency"};
-  Maybe<bool> found_style = Intl::GetStringOption(
-      isolate, options, "style", style_values, service, &style_cstr);
-  MAYBE_RETURN(found_style, MaybeHandle<JSNumberFormat>());
-  Style style = Style::DECIMAL;
-  if (found_style.FromJust()) {
-    DCHECK_NOT_NULL(style_cstr.get());
-    if (strcmp(style_cstr.get(), "percent") == 0) {
-      style = Style::PERCENT;
-    } else if (strcmp(style_cstr.get(), "currency") == 0) {
-      style = Style::CURRENCY;
-    }
-  }
+  Maybe<Style> maybe_style = Intl::GetStringOption<Style>(
+      isolate, options, "style", service, {"decimal", "percent", "currency"},
+      {Style::DECIMAL, Style::PERCENT, Style::CURRENCY}, Style::DECIMAL);
+  MAYBE_RETURN(maybe_style, MaybeHandle<JSNumberFormat>());
+  Style style = maybe_style.FromJust();
 
   // 13. Set numberFormat.[[Style]] to style.
   number_format->set_style(style);
@@ -340,26 +344,16 @@ MaybeHandle<JSNumberFormat> JSNumberFormat::Initialize(
 
   // 18. Let currencyDisplay be ? GetOption(options, "currencyDisplay",
   // "string", « "code",  "symbol", "name" », "symbol").
-  std::unique_ptr<char[]> currency_display_cstr;
-  const std::vector<const char*> currency_display_values = {"code", "name",
-                                                            "symbol"};
-  Maybe<bool> found_currency_display = Intl::GetStringOption(
-      isolate, options, "currencyDisplay", currency_display_values, service,
-      &currency_display_cstr);
-  MAYBE_RETURN(found_currency_display, MaybeHandle<JSNumberFormat>());
-  CurrencyDisplay currency_display = CurrencyDisplay::SYMBOL;
-  UNumberFormatStyle format_style = UNUM_CURRENCY;
-
-  if (found_currency_display.FromJust()) {
-    DCHECK_NOT_NULL(currency_display_cstr.get());
-    if (strcmp(currency_display_cstr.get(), "code") == 0) {
-      currency_display = CurrencyDisplay::CODE;
-      format_style = UNUM_CURRENCY_ISO;
-    } else if (strcmp(currency_display_cstr.get(), "name") == 0) {
-      currency_display = CurrencyDisplay::NAME;
-      format_style = UNUM_CURRENCY_PLURAL;
-    }
-  }
+  Maybe<CurrencyDisplay> maybe_currencyDisplay =
+      Intl::GetStringOption<CurrencyDisplay>(
+          isolate, options, "currencyDisplay", service,
+          {"code", "symbol", "name"},
+          {CurrencyDisplay::CODE, CurrencyDisplay::SYMBOL,
+           CurrencyDisplay::NAME},
+          CurrencyDisplay::SYMBOL);
+  MAYBE_RETURN(maybe_currencyDisplay, MaybeHandle<JSNumberFormat>());
+  CurrencyDisplay currency_display = maybe_currencyDisplay.FromJust();
+  UNumberFormatStyle format_style = ToNumberFormatStyle(currency_display);
 
   UErrorCode status = U_ZERO_ERROR;
   std::unique_ptr<icu::NumberFormat> icu_number_format;

src/objects/js-plural-rules.cc

@@ -130,20 +130,11 @@ MaybeHandle<JSPluralRules> JSPluralRules::Initialize(
 
   // 7. Let t be ? GetOption(options, "type", "string", « "cardinal",
   // "ordinal" », "cardinal").
-  std::vector<const char*> values = {"cardinal", "ordinal"};
-  std::unique_ptr<char[]> type_str = nullptr;
-  JSPluralRules::Type type = JSPluralRules::Type::CARDINAL;
-  Maybe<bool> found = Intl::GetStringOption(isolate, options, "type", values,
-                                            "Intl.PluralRules", &type_str);
-  MAYBE_RETURN(found, MaybeHandle<JSPluralRules>());
-  if (found.FromJust()) {
-    DCHECK_NOT_NULL(type_str.get());
-    if (strcmp("ordinal", type_str.get()) == 0) {
-      type = JSPluralRules::Type::ORDINAL;
-    } else {
-      DCHECK_EQ(0, strcmp("cardinal", type_str.get()));
-    }
-  }
+  Maybe<Type> maybe_type = Intl::GetStringOption<Type>(
+      isolate, options, "type", "Intl.PluralRules", {"cardinal", "ordinal"},
+      {Type::CARDINAL, Type::ORDINAL}, Type::CARDINAL);
+  MAYBE_RETURN(maybe_type, MaybeHandle<JSPluralRules>());
+  Type type = maybe_type.FromJust();
 
   // 8. Set pluralRules.[[Type]] to t.
   plural_rules->set_type(type);

src/objects/js-relative-time-format.cc

@@ -108,34 +108,23 @@ MaybeHandle<JSRelativeTimeFormat> JSRelativeTimeFormat::Initialize(
 
   // 12. Let s be ? GetOption(options, "style", "string",
   //                          «"long", "short", "narrow"», "long").
-  std::unique_ptr<char[]> style_str = nullptr;
-  std::vector<const char*> style_values = {"long", "short", "narrow"};
-  Maybe<bool> maybe_found_style =
-      Intl::GetStringOption(isolate, options, "style", style_values,
-                            "Intl.RelativeTimeFormat", &style_str);
-  Style style_enum = Style::LONG;
-  MAYBE_RETURN(maybe_found_style, MaybeHandle<JSRelativeTimeFormat>());
-  if (maybe_found_style.FromJust()) {
-    DCHECK_NOT_NULL(style_str.get());
-    style_enum = getStyle(style_str.get());
-  }
+  Maybe<Style> maybe_style = Intl::GetStringOption<Style>(
+      isolate, options, "style", "Intl.RelativeTimeFormat",
+      {"long", "short", "narrow"}, {Style::LONG, Style::SHORT, Style::NARROW},
+      Style::LONG);
+  MAYBE_RETURN(maybe_style, MaybeHandle<JSRelativeTimeFormat>());
+  Style style_enum = maybe_style.FromJust();
 
   // 13. Set relativeTimeFormat.[[Style]] to s.
   relative_time_format_holder->set_style(style_enum);
 
   // 14. Let numeric be ? GetOption(options, "numeric", "string",
   //                                «"always", "auto"», "always").
-  std::unique_ptr<char[]> numeric_str = nullptr;
-  std::vector<const char*> numeric_values = {"always", "auto"};
-  Maybe<bool> maybe_found_numeric =
-      Intl::GetStringOption(isolate, options, "numeric", numeric_values,
-                            "Intl.RelativeTimeFormat", &numeric_str);
-  Numeric numeric_enum = Numeric::ALWAYS;
-  MAYBE_RETURN(maybe_found_numeric, MaybeHandle<JSRelativeTimeFormat>());
-  if (maybe_found_numeric.FromJust()) {
-    DCHECK_NOT_NULL(numeric_str.get());
-    numeric_enum = getNumeric(numeric_str.get());
-  }
+  Maybe<Numeric> maybe_numeric = Intl::GetStringOption<Numeric>(
+      isolate, options, "numeric", "Intl.RelativeTimeFormat",
+      {"always", "auto"}, {Numeric::ALWAYS, Numeric::AUTO}, Numeric::ALWAYS);
+  MAYBE_RETURN(maybe_numeric, MaybeHandle<JSRelativeTimeFormat>());
+  Numeric numeric_enum = maybe_numeric.FromJust();
 
   // 15. Set relativeTimeFormat.[[Numeric]] to numeric.
   relative_time_format_holder->set_numeric(numeric_enum);

src/objects/js-segmenter.cc

@@ -82,18 +82,15 @@ MaybeHandle<JSSegmenter> JSSegmenter::Initialize(
 
   // 7. Let lineBreakStyle be ? GetOption(options, "lineBreakStyle", "string", «
   // "strict", "normal", "loose" », "normal").
-  std::unique_ptr<char[]> line_break_style_str = nullptr;
-  const std::vector<const char*> line_break_style_values = {"strict", "normal",
-                                                            "loose"};
-  Maybe<bool> maybe_found_line_break_style = Intl::GetStringOption(
-      isolate, options, "lineBreakStyle", line_break_style_values,
-      "Intl.Segmenter", &line_break_style_str);
-  LineBreakStyle line_break_style_enum = LineBreakStyle::NORMAL;
-  MAYBE_RETURN(maybe_found_line_break_style, MaybeHandle<JSSegmenter>());
-  if (maybe_found_line_break_style.FromJust()) {
-    DCHECK_NOT_NULL(line_break_style_str.get());
-    line_break_style_enum = GetLineBreakStyle(line_break_style_str.get());
-  }
+  Maybe<LineBreakStyle> maybe_line_break_style =
+      Intl::GetStringOption<LineBreakStyle>(
+          isolate, options, "lineBreakStyle", "Intl.Segmenter",
+          {"strict", "normal", "loose"},
+          {LineBreakStyle::STRICT, LineBreakStyle::NORMAL,
+           LineBreakStyle::LOOSE},
+          LineBreakStyle::NORMAL);
+  MAYBE_RETURN(maybe_line_break_style, MaybeHandle<JSSegmenter>());
+  LineBreakStyle line_break_style_enum = maybe_line_break_style.FromJust();
 
   // 10. Set segmenter.[[Locale]] to the value of r.[[Locale]].
   Handle<String> locale_str =
@@ -102,19 +99,14 @@ MaybeHandle<JSSegmenter> JSSegmenter::Initialize(
 
   // 13. Let granularity be ? GetOption(options, "granularity", "string", «
   // "grapheme", "word", "sentence", "line" », "grapheme").
-
-  std::unique_ptr<char[]> granularity_str = nullptr;
-  const std::vector<const char*> granularity_values = {"grapheme", "word",
-                                                       "sentence", "line"};
-  Maybe<bool> maybe_found_granularity =
-      Intl::GetStringOption(isolate, options, "granularity", granularity_values,
-                            "Intl.Segmenter", &granularity_str);
-  Granularity granularity_enum = Granularity::GRAPHEME;
-  MAYBE_RETURN(maybe_found_granularity, MaybeHandle<JSSegmenter>());
-  if (maybe_found_granularity.FromJust()) {
-    DCHECK_NOT_NULL(granularity_str.get());
-    granularity_enum = GetGranularity(granularity_str.get());
-  }
+  Maybe<Granularity> maybe_granularity = Intl::GetStringOption<Granularity>(
+      isolate, options, "granularity", "Intl.Segmenter",
+      {"grapheme", "word", "sentence", "line"},
+      {Granularity::GRAPHEME, Granularity::WORD, Granularity::SENTENCE,
+       Granularity::LINE},
+      Granularity::GRAPHEME);
+  MAYBE_RETURN(maybe_granularity, MaybeHandle<JSSegmenter>());
+  Granularity granularity_enum = maybe_granularity.FromJust();
 
   // 14. Set segmenter.[[SegmenterGranularity]] to granularity.
   segmenter_holder->set_granularity(granularity_enum);