LibJS: Implement Intl.NumberFormat.prototype.formatRangeToParts

Userland/Libraries/LibJS/Runtime/Intl/NumberFormat.cpp

@@ -1862,4 +1862,43 @@ ThrowCompletionOr<String> format_numeric_range(GlobalObject& global_object, Numb
     return result.build();
 }
 
+// 1.1.25 FormatNumericRangeToParts( numberFormat, x, y ), https://tc39.es/proposal-intl-numberformat-v3/out/numberformat/proposed.html#sec-formatnumericrangetoparts
+ThrowCompletionOr<Array*> format_numeric_range_to_parts(GlobalObject& global_object, NumberFormat& number_format, MathematicalValue start, MathematicalValue end)
+{
+    auto& vm = global_object.vm();
+
+    // 1. Let parts be ? PartitionNumberRangePattern(numberFormat, x, y).
+    auto parts = TRY(partition_number_range_pattern(global_object, number_format, move(start), move(end)));
+
+    // 2. Let result be ! ArrayCreate(0).
+    auto* result = MUST(Array::create(global_object, 0));
+
+    // 3. Let n be 0.
+    size_t n = 0;
+
+    // 4. For each Record { [[Type]], [[Value]] } part in parts, do
+    for (auto& part : parts) {
+        // a. Let O be OrdinaryObjectCreate(%Object.prototype%).
+        auto* object = Object::create(global_object, global_object.object_prototype());
+
+        // b. Perform ! CreateDataPropertyOrThrow(O, "type", part.[[Type]]).
+        MUST(object->create_data_property_or_throw(vm.names.type, js_string(vm, part.type)));
+
+        // c. Perform ! CreateDataPropertyOrThrow(O, "value", part.[[Value]]).
+        MUST(object->create_data_property_or_throw(vm.names.value, js_string(vm, move(part.value))));
+
+        // d. Perform ! CreateDataPropertyOrThrow(O, "source", part.[[Source]]).
+        MUST(object->create_data_property_or_throw(vm.names.source, js_string(vm, part.source)));
+
+        // e. Perform ! CreateDataPropertyOrThrow(result, ! ToString(n), O).
+        MUST(result->create_data_property_or_throw(n, object));
+
+        // f. Increment n by 1.
+        ++n;
+    }
+
+    // 5. Return result.
+    return result;
+}
+
 }