LibJS: Implement Intl.RelativeTimeFormat.prototype.formatToParts

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

@@ -6,6 +6,7 @@
 
 #include <AK/StringBuilder.h>
 #include <LibJS/Runtime/AbstractOperations.h>
+#include <LibJS/Runtime/Array.h>
 #include <LibJS/Runtime/GlobalObject.h>
 #include <LibJS/Runtime/Intl/NumberFormat.h>
 #include <LibJS/Runtime/Intl/NumberFormatConstructor.h>
@@ -313,4 +314,46 @@ ThrowCompletionOr<String> format_relative_time(GlobalObject& global_object, Rela
     return result.build();
 }
 
+// 17.1.6 FormatRelativeTimeToParts ( relativeTimeFormat, value, unit ), https://tc39.es/ecma402/#sec-FormatRelativeTimeToParts
+ThrowCompletionOr<Array*> format_relative_time_to_parts(GlobalObject& global_object, RelativeTimeFormat& relative_time_format, double value, StringView unit)
+{
+    auto& vm = global_object.vm();
+
+    // 1. Let parts be ? PartitionRelativeTimePattern(relativeTimeFormat, value, unit).
+    auto parts = TRY(partition_relative_time_pattern(global_object, relative_time_format, value, unit));
+
+    // 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]], [[Unit]] } 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. If part.[[Unit]] is not empty, then
+        if (!part.unit.is_empty()) {
+            // i. Perform ! CreateDataPropertyOrThrow(O, "unit", part.[[Unit]]).
+            MUST(object->create_data_property_or_throw(vm.names.unit, js_string(vm, part.unit)));
+        }
+
+        // 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;
+}
+
 }

Userland/Libraries/LibJS/Runtime/Intl/RelativeTimeFormat.h

@@ -82,5 +82,6 @@ ThrowCompletionOr<Unicode::TimeUnit> singular_relative_time_unit(GlobalObject& g
 ThrowCompletionOr<Vector<PatternPartitionWithUnit>> partition_relative_time_pattern(GlobalObject& global_object, RelativeTimeFormat& relative_time_format, double value, StringView unit);
 Vector<PatternPartitionWithUnit> make_parts_list(StringView pattern, StringView unit, Vector<PatternPartition> parts);
 ThrowCompletionOr<String> format_relative_time(GlobalObject& global_object, RelativeTimeFormat& relative_time_format, double value, StringView unit);
+ThrowCompletionOr<Array*> format_relative_time_to_parts(GlobalObject& global_object, RelativeTimeFormat& relative_time_format, double value, StringView unit);
 
 }

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

@@ -4,6 +4,7 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <LibJS/Runtime/Array.h>
 #include <LibJS/Runtime/GlobalObject.h>
 #include <LibJS/Runtime/Intl/RelativeTimeFormatPrototype.h>
 
@@ -26,6 +27,7 @@ void RelativeTimeFormatPrototype::initialize(GlobalObject& global_object)
 
     u8 attr = Attribute::Writable | Attribute::Configurable;
     define_native_function(vm.names.format, format, 2, attr);
+    define_native_function(vm.names.formatToParts, format_to_parts, 2, attr);
     define_native_function(vm.names.resolvedOptions, resolved_options, 0, attr);
 }
 
@@ -47,6 +49,23 @@ JS_DEFINE_NATIVE_FUNCTION(RelativeTimeFormatPrototype::format)
     return js_string(vm, move(formatted));
 }
 
+// 17.4.4 Intl.RelativeTimeFormat.prototype.formatToParts ( value, unit ), https://tc39.es/ecma402/#sec-Intl.RelativeTimeFormat.prototype.formatToParts
+JS_DEFINE_NATIVE_FUNCTION(RelativeTimeFormatPrototype::format_to_parts)
+{
+    // 1. Let relativeTimeFormat be the this value.
+    // 2. Perform ? RequireInternalSlot(relativeTimeFormat, [[InitializedRelativeTimeFormat]]).
+    auto* relative_time_format = TRY(typed_this_object(global_object));
+
+    // 3. Let value be ? ToNumber(value).
+    auto value = TRY(vm.argument(0).to_number(global_object));
+
+    // 4. Let unit be ? ToString(unit).
+    auto unit = TRY(vm.argument(1).to_string(global_object));
+
+    // 5. Return ? FormatRelativeTimeToParts(relativeTimeFormat, value, unit).
+    return TRY(format_relative_time_to_parts(global_object, *relative_time_format, value.as_double(), unit));
+}
+
 // 17.4.5 Intl.RelativeTimeFormat.prototype.resolvedOptions ( ), https://tc39.es/ecma402/#sec-intl.relativetimeformat.prototype.resolvedoptions
 JS_DEFINE_NATIVE_FUNCTION(RelativeTimeFormatPrototype::resolved_options)
 {

Userland/Libraries/LibJS/Runtime/Intl/RelativeTimeFormatPrototype.h

@@ -21,6 +21,7 @@ public:
 
 private:
     JS_DECLARE_NATIVE_FUNCTION(format);
+    JS_DECLARE_NATIVE_FUNCTION(format_to_parts);
     JS_DECLARE_NATIVE_FUNCTION(resolved_options);
 };