LibJS: Implement Intl.NumberFormat.prototype.formatToParts

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

@@ -5,6 +5,7 @@
  */
 
 #include <AK/Array.h>
+#include <LibJS/Runtime/Array.h>
 #include <LibJS/Runtime/GlobalObject.h>
 #include <LibJS/Runtime/Intl/NumberFormat.h>
 #include <LibJS/Runtime/Intl/NumberFormatFunction.h>
@@ -959,6 +960,43 @@ String format_numeric(NumberFormat& number_format, double number)
     return result.build();
 }
 
+// 15.1.9 FormatNumericToParts ( numberFormat, x ), https://tc39.es/ecma402/#sec-formatnumbertoparts
+Array* format_numeric_to_parts(GlobalObject& global_object, NumberFormat& number_format, double number)
+{
+    auto& vm = global_object.vm();
+
+    // 1. Let parts be ? PartitionNumberPattern(numberFormat, x).
+    // Note: Our implementation of PartitionNumberPattern does not throw.
+    auto parts = partition_number_pattern(number_format, number);
+
+    // 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(result, ! ToString(n), O).
+        MUST(result->create_data_property_or_throw(n, object));
+
+        // e. Increment n by 1.
+        ++n;
+    }
+
+    // 5. Return result.
+    return result;
+}
+
 static String cut_trailing_zeroes(StringView string, int cut)
 {
     // These steps are exactly the same between ToRawPrecision and ToRawFixed.

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

@@ -199,6 +199,7 @@ FormatResult format_numeric_to_string(NumberFormat& number_format, double number
 Vector<PatternPartition> partition_number_pattern(NumberFormat& number_format, double number);
 Vector<PatternPartition> partition_notation_sub_pattern(NumberFormat& number_format, double number, String formatted_string, int exponent);
 String format_numeric(NumberFormat& number_format, double number);
+Array* format_numeric_to_parts(GlobalObject& global_object, NumberFormat& number_format, double number);
 RawFormatResult to_raw_precision(double number, int min_precision, int max_precision);
 RawFormatResult to_raw_fixed(double number, int min_fraction, int max_fraction);
 ThrowCompletionOr<void> set_number_format_unit_options(GlobalObject& global_object, NumberFormat& intl_object, Object const& options);

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

@@ -5,6 +5,7 @@
  */
 
 #include <AK/TypeCasts.h>
+#include <LibJS/Runtime/Array.h>
 #include <LibJS/Runtime/GlobalObject.h>
 #include <LibJS/Runtime/Intl/NumberFormat.h>
 #include <LibJS/Runtime/Intl/NumberFormatFunction.h>
@@ -30,6 +31,7 @@ void NumberFormatPrototype::initialize(GlobalObject& global_object)
     define_native_accessor(vm.names.format, format, nullptr, Attribute::Configurable);
 
     u8 attr = Attribute::Writable | Attribute::Configurable;
+    define_native_function(vm.names.formatToParts, format_to_parts, 1, attr);
     define_native_function(vm.names.resolvedOptions, resolved_options, 0, attr);
 }
 
@@ -56,6 +58,27 @@ JS_DEFINE_NATIVE_FUNCTION(NumberFormatPrototype::format)
     return number_format->bound_format();
 }
 
+// 15.4.4 Intl.NumberFormat.prototype.formatToParts ( value ), https://tc39.es/ecma402/#sec-intl.numberformat.prototype.formattoparts
+JS_DEFINE_NATIVE_FUNCTION(NumberFormatPrototype::format_to_parts)
+{
+    auto value = vm.argument(0);
+
+    // 1. Let nf be the this value.
+    // 2. Perform ? RequireInternalSlot(nf, [[InitializedNumberFormat]]).
+    auto* number_format = TRY(typed_this_object(global_object));
+
+    // 3. Let x be ? ToNumeric(value).
+    value = TRY(value.to_numeric(global_object));
+
+    // FIXME: Support BigInt number formatting.
+    if (value.is_bigint())
+        return vm.throw_completion<InternalError>(global_object, ErrorType::NotImplemented, "BigInt number formatting");
+
+    // 4. Return ? FormatNumericToParts(nf, x).
+    // Note: Our implementation of FormatNumericToParts does not throw.
+    return format_numeric_to_parts(global_object, *number_format, value.as_double());
+}
+
 // 15.4.5 Intl.NumberFormat.prototype.resolvedOptions ( ), https://tc39.es/ecma402/#sec-intl.numberformat.prototype.resolvedoptions
 JS_DEFINE_NATIVE_FUNCTION(NumberFormatPrototype::resolved_options)
 {

Userland/Libraries/LibJS/Runtime/Intl/NumberFormatPrototype.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);
 };