LibJS: Implement the Temporal.PlainMonthDay constructor

And the simple Temporal.PlainMonthDay.prototype getters, so that the constructed Temporal.PlainMonthDay may actually be validated.
Author: https://github.com/trflynn89 Commit: 1a386e78c3 Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2471
2025-07-30 04:39:06 +00:00 · 2024-11-20 12:59:15 -05:00 · 2024-11-20 12:59:15 -05:00 · 1a386e78c3 · 2024-11-22 00:25:44 +00:00
commit 1a386e78c3
parent b3b968bed9
31 changed files with 2515 additions and 4 deletions
--- a/Libraries/LibJS/Runtime/Temporal/PlainMonthDayConstructor.cpp
+++ b/Libraries/LibJS/Runtime/Temporal/PlainMonthDayConstructor.cpp
@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2021-2023, Linus Groh <linusg@serenityos.org>
+ * Copyright (c) 2024, Tim Flynn <trflynn89@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Runtime/Temporal/AbstractOperations.h>
+#include <LibJS/Runtime/Temporal/Calendar.h>
+#include <LibJS/Runtime/Temporal/PlainDate.h>
+#include <LibJS/Runtime/Temporal/PlainMonthDay.h>
+#include <LibJS/Runtime/Temporal/PlainMonthDayConstructor.h>
+
+namespace JS::Temporal {
+
+GC_DEFINE_ALLOCATOR(PlainMonthDayConstructor);
+
+// 10.1 The Temporal.PlainMonthDay Constructor, https://tc39.es/proposal-temporal/#sec-temporal-plainmonthday-constructor
+PlainMonthDayConstructor::PlainMonthDayConstructor(Realm& realm)
+    : NativeFunction(realm.vm().names.PlainMonthDay.as_string(), realm.intrinsics().function_prototype())
+{
+}
+
+void PlainMonthDayConstructor::initialize(Realm& realm)
+{
+    Base::initialize(realm);
+
+    auto& vm = this->vm();
+
+    // 10.2.1 Temporal.PlainMonthDay.prototype, https://tc39.es/proposal-temporal/#sec-temporal.plainmonthday.prototype
+    define_direct_property(vm.names.prototype, realm.intrinsics().temporal_plain_month_day_prototype(), 0);
+
+    define_direct_property(vm.names.length, Value(2), Attribute::Configurable);
+
+    u8 attr = Attribute::Writable | Attribute::Configurable;
+    define_native_function(realm, vm.names.from, from, 1, attr);
+}
+
+// 10.1.1 Temporal.PlainMonthDay ( isoMonth, isoDay [ , calendar [ , referenceISOYear ] ] ), https://tc39.es/proposal-temporal/#sec-temporal.plainmonthday
+ThrowCompletionOr<Value> PlainMonthDayConstructor::call()
+{
+    auto& vm = this->vm();
+
+    // 1. If NewTarget is undefined, throw a TypeError exception.
+    return vm.throw_completion<TypeError>(ErrorType::ConstructorWithoutNew, "Temporal.PlainMonthDay");
+}
+
+// 10.1.1 Temporal.PlainMonthDay ( isoMonth, isoDay [ , calendar [ , referenceISOYear ] ] ), https://tc39.es/proposal-temporal/#sec-temporal.plainmonthday
+ThrowCompletionOr<GC::Ref<Object>> PlainMonthDayConstructor::construct(FunctionObject& new_target)
+{
+    auto& vm = this->vm();
+
+    auto iso_month = vm.argument(0);
+    auto iso_day = vm.argument(1);
+    auto calendar_value = vm.argument(2);
+    auto reference_iso_year = vm.argument(3);
+
+    // 2. If referenceISOYear is undefined, then
+    if (reference_iso_year.is_undefined()) {
+        // a. Set referenceISOYear to 1972𝔽 (the first ISO 8601 leap year after the epoch).
+        reference_iso_year = Value { 1972 };
+    }
+
+    // 3. Let m be ? ToIntegerWithTruncation(isoMonth).
+    auto month = TRY(to_integer_with_truncation(vm, iso_month, ErrorType::TemporalInvalidPlainMonthDay));
+
+    // 4. Let d be ? ToIntegerWithTruncation(isoDay).
+    auto day = TRY(to_integer_with_truncation(vm, iso_day, ErrorType::TemporalInvalidPlainMonthDay));
+
+    // 5. If calendar is undefined, set calendar to "iso8601".
+    if (calendar_value.is_undefined())
+        calendar_value = PrimitiveString::create(vm, "iso8601"_string);
+
+    // 6. If calendar is not a String, throw a TypeError exception.
+    if (!calendar_value.is_string())
+        return vm.throw_completion<TypeError>(ErrorType::NotAString, calendar_value);
+
+    // 7. Set calendar to ? CanonicalizeCalendar(calendar).
+    auto calendar = TRY(canonicalize_calendar(vm, calendar_value.as_string().utf8_string_view()));
+
+    // 8. Let y be ? ToIntegerWithTruncation(referenceISOYear).
+    auto year = TRY(to_integer_with_truncation(vm, reference_iso_year, ErrorType::TemporalInvalidPlainMonthDay));
+
+    // 9. If IsValidISODate(y, m, d) is false, throw a RangeError exception.
+    if (!is_valid_iso_date(year, month, day))
+        return vm.throw_completion<RangeError>(ErrorType::TemporalInvalidPlainMonthDay);
+
+    // 10. Let isoDate be CreateISODateRecord(y, m, d).
+    auto iso_date = create_iso_date_record(year, month, day);
+
+    // 11. Return ? CreateTemporalMonthDay(isoDate, calendar, NewTarget).
+    return TRY(create_temporal_month_day(vm, iso_date, move(calendar), &new_target));
+}
+
+// 10.2.2 Temporal.PlainMonthDay.from ( item [ , options ] ), https://tc39.es/proposal-temporal/#sec-temporal.plainmonthday.from
+JS_DEFINE_NATIVE_FUNCTION(PlainMonthDayConstructor::from)
+{
+    // 1. Return ? ToTemporalMonthDay(item, options).
+    return TRY(to_temporal_month_day(vm, vm.argument(0), vm.argument(1)));
+}
+
+}