LibJS: Implement Intl.NumberFormat.prototype.resolvedOptions

2 files changed, 75 insertions, 0 deletions

diff --git a/Userland/Libraries/LibJS/Runtime/Intl/NumberFormatPrototype.cpp b/Userland/Libraries/LibJS/Runtime/Intl/NumberFormatPrototype.cpp
index da9e01bb3e..6d11996b1f 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/NumberFormatPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/NumberFormatPrototype.cpp
@@ -4,11 +4,29 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <AK/TypeCasts.h>
 #include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/Intl/NumberFormat.h>
 #include <LibJS/Runtime/Intl/NumberFormatPrototype.h>
 
 namespace JS::Intl {
 
+static NumberFormat* typed_this(GlobalObject& global_object)
+{
+    auto& vm = global_object.vm();
+
+    auto* this_object = vm.this_value(global_object).to_object(global_object);
+    if (!this_object)
+        return nullptr;
+
+    if (!is<NumberFormat>(this_object)) {
+        vm.throw_exception<TypeError>(global_object, ErrorType::NotA, "Intl.NumberFormat");
+        return nullptr;
+    }
+
+    return static_cast<NumberFormat*>(this_object);
+}
+
 // 15.4 Properties of the Intl.NumberFormat Prototype Object, https://tc39.es/ecma402/#sec-properties-of-intl-numberformat-prototype-object
 NumberFormatPrototype::NumberFormatPrototype(GlobalObject& global_object)
     : Object(*global_object.object_prototype())
@@ -23,6 +41,60 @@ void NumberFormatPrototype::initialize(GlobalObject& global_object)
 
     // 15.4.2 Intl.NumberFormat.prototype [ @@toStringTag ], https://tc39.es/ecma402/#sec-intl.numberformat.prototype-@@tostringtag
     define_direct_property(*vm.well_known_symbol_to_string_tag(), js_string(vm, "Intl.NumberFormat"), Attribute::Configurable);
+
+    u8 attr = Attribute::Writable | Attribute::Configurable;
+    define_native_function(vm.names.resolvedOptions, resolved_options, 0, attr);
+}
+
+// 15.4.5 Intl.NumberFormat.prototype.resolvedOptions ( ), https://tc39.es/ecma402/#sec-intl.numberformat.prototype.resolvedoptions
+JS_DEFINE_NATIVE_FUNCTION(NumberFormatPrototype::resolved_options)
+{
+    // 1. Let nf be the this value.
+    // 2. If the implementation supports the normative optional constructor mode of 4.3 Note 1, then
+    //     a. Set nf to ? UnwrapNumberFormat(nf).
+    // 3. Perform ? RequireInternalSlot(nf, [[InitializedNumberFormat]]).
+    auto* number_format = typed_this(global_object);
+    if (vm.exception())
+        return {};
+
+    // 4. Let options be ! OrdinaryObjectCreate(%Object.prototype%).
+    auto* options = Object::create(global_object, global_object.object_prototype());
+
+    // 5. For each row of Table 11, except the header row, in table order, do
+    //     a. Let p be the Property value of the current row.
+    //     b. Let v be the value of nf's internal slot whose name is the Internal Slot value of the current row.
+    //     c. If v is not undefined, then
+    //         i. Perform ! CreateDataPropertyOrThrow(options, p, v).
+    options->create_data_property_or_throw(vm.names.locale, js_string(vm, number_format->locale()));
+    options->create_data_property_or_throw(vm.names.numberingSystem, js_string(vm, number_format->numbering_system()));
+    options->create_data_property_or_throw(vm.names.style, js_string(vm, number_format->style_string()));
+    if (number_format->has_currency())
+        options->create_data_property_or_throw(vm.names.currency, js_string(vm, number_format->currency()));
+    if (number_format->has_currency_display())
+        options->create_data_property_or_throw(vm.names.currencyDisplay, js_string(vm, number_format->currency_display_string()));
+    if (number_format->has_currency_sign())
+        options->create_data_property_or_throw(vm.names.currencySign, js_string(vm, number_format->currency_sign_string()));
+    if (number_format->has_unit())
+        options->create_data_property_or_throw(vm.names.unit, js_string(vm, number_format->unit()));
+    if (number_format->has_unit_display())
+        options->create_data_property_or_throw(vm.names.unitDisplay, js_string(vm, number_format->unit_display_string()));
+    options->create_data_property_or_throw(vm.names.minimumIntegerDigits, Value(number_format->min_integer_digits()));
+    if (number_format->has_min_fraction_digits())
+        options->create_data_property_or_throw(vm.names.minimumFractionDigits, Value(number_format->min_fraction_digits()));
+    if (number_format->has_max_fraction_digits())
+        options->create_data_property_or_throw(vm.names.maximumFractionDigits, Value(number_format->max_fraction_digits()));
+    if (number_format->has_min_significant_digits())
+        options->create_data_property_or_throw(vm.names.minimumSignificantDigits, Value(number_format->min_significant_digits()));
+    if (number_format->has_max_significant_digits())
+        options->create_data_property_or_throw(vm.names.maximumSignificantDigits, Value(number_format->max_significant_digits()));
+    options->create_data_property_or_throw(vm.names.useGrouping, Value(number_format->use_grouping()));
+    options->create_data_property_or_throw(vm.names.notation, js_string(vm, number_format->notation_string()));
+    if (number_format->has_compact_display())
+        options->create_data_property_or_throw(vm.names.compactDisplay, js_string(vm, number_format->compact_display_string()));
+    options->create_data_property_or_throw(vm.names.signDisplay, js_string(vm, number_format->sign_display_string()));
+
+    // 5. Return options.
+    return options;
 }
 
 }
diff --git a/Userland/Libraries/LibJS/Runtime/Intl/NumberFormatPrototype.h b/Userland/Libraries/LibJS/Runtime/Intl/NumberFormatPrototype.h
index a9bd319006..f392ab7824 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/NumberFormatPrototype.h
+++ b/Userland/Libraries/LibJS/Runtime/Intl/NumberFormatPrototype.h
@@ -17,6 +17,9 @@ public:
     explicit NumberFormatPrototype(GlobalObject&);
     virtual void initialize(GlobalObject&) override;
     virtual ~NumberFormatPrototype() override = default;
+
+private:
+    JS_DECLARE_NATIVE_FUNCTION(resolved_options);
 };
 
 }