LibJS: Implement the Intl.PluralRules constructor

1 files changed, 45 insertions, 0 deletions

diff --git a/Userland/Libraries/LibJS/Runtime/Intl/PluralRules.cpp b/Userland/Libraries/LibJS/Runtime/Intl/PluralRules.cpp
index 25e89517e8..51fcd89a22 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/PluralRules.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/PluralRules.cpp
@@ -4,6 +4,8 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <AK/Array.h>
+#include <LibJS/Runtime/GlobalObject.h>
 #include <LibJS/Runtime/Intl/PluralRules.h>
 
 namespace JS::Intl {
@@ -37,4 +39,47 @@ StringView PluralRules::type_string() const
     }
 }
 
+// 16.1.1 InitializePluralRules ( pluralRules, locales, options ), https://tc39.es/ecma402/#sec-initializepluralrules
+ThrowCompletionOr<PluralRules*> initialize_plural_rules(GlobalObject& global_object, PluralRules& plural_rules, Value locales_value, Value options_value)
+{
+    auto& vm = global_object.vm();
+
+    // 1. Let requestedLocales be ? CanonicalizeLocaleList(locales).
+    auto requested_locales = TRY(canonicalize_locale_list(global_object, locales_value));
+
+    // 2. Set options to ? CoerceOptionsToObject(options).
+    auto* options = TRY(coerce_options_to_object(global_object, options_value));
+
+    // 3. Let opt be a new Record.
+    LocaleOptions opt {};
+
+    // 4. Let matcher be ? GetOption(options, "localeMatcher", "string", « "lookup", "best fit" », "best fit").
+    auto matcher = TRY(get_option(global_object, *options, vm.names.localeMatcher, Value::Type::String, AK::Array { "lookup"sv, "best fit"sv }, "best fit"sv));
+
+    // 5. Set opt.[[localeMatcher]] to matcher.
+    opt.locale_matcher = matcher;
+
+    // 6. Let t be ? GetOption(options, "type", "string", « "cardinal", "ordinal" », "cardinal").
+    auto type = TRY(get_option(global_object, *options, vm.names.type, Value::Type::String, AK::Array { "cardinal"sv, "ordinal"sv }, "cardinal"sv));
+
+    // 7. Set pluralRules.[[Type]] to t.
+    plural_rules.set_type(type.as_string().string());
+
+    // 8. Perform ? SetNumberFormatDigitOptions(pluralRules, options, +0𝔽, 3𝔽, "standard").
+    TRY(set_number_format_digit_options(global_object, plural_rules, *options, 0, 3, NumberFormat::Notation::Standard));
+
+    // 9. Let localeData be %PluralRules%.[[LocaleData]].
+    // 10. Let r be ResolveLocale(%PluralRules%.[[AvailableLocales]], requestedLocales, opt, %PluralRules%.[[RelevantExtensionKeys]], localeData).
+    auto result = resolve_locale(requested_locales, opt, {});
+
+    // 11. Set pluralRules.[[Locale]] to r.[[locale]].
+    plural_rules.set_locale(move(result.locale));
+
+    // Non-standard, the data locale is used by our NumberFormat implementation.
+    plural_rules.set_data_locale(move(result.data_locale));
+
+    // 12. Return pluralRules.
+    return &plural_rules;
+}
+
 }