LibJS: Start implementing Temporal.PlainDate

This commit adds the PlainDate object itself, its constructor and
prototype (currently empty), and several required abstract operations.

1 files changed, 57 insertions, 1 deletions

diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainDate.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/PlainDate.cpp
index bf18c9a5c2..efe78699f8 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/PlainDate.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainDate.cpp
@@ -4,12 +4,68 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <LibJS/Runtime/AbstractOperations.h>
+#include <LibJS/Runtime/GlobalObject.h>
 #include <LibJS/Runtime/Temporal/Calendar.h>
 #include <LibJS/Runtime/Temporal/PlainDate.h>
-#include <LibJS/Runtime/Value.h>
+#include <LibJS/Runtime/Temporal/PlainDateConstructor.h>
+#include <LibJS/Runtime/Temporal/PlainDateTime.h>
 
 namespace JS::Temporal {
 
+// 3 Temporal.PlainDate Objects, https://tc39.es/proposal-temporal/#sec-temporal-plaindate-objects
+PlainDate::PlainDate(i32 year, i32 month, i32 day, Object& calendar, Object& prototype)
+    : Object(prototype)
+    , m_iso_year(year)
+    , m_iso_month(month)
+    , m_iso_day(day)
+    , m_calendar(calendar)
+{
+}
+
+void PlainDate::visit_edges(Visitor& visitor)
+{
+    visitor.visit(&m_calendar);
+}
+
+// 3.5.1 CreateTemporalDate ( isoYear, isoMonth, isoDay, calendar [ , newTarget ] ), https://tc39.es/proposal-temporal/#sec-temporal-createtemporaldate
+PlainDate* create_temporal_date(GlobalObject& global_object, i32 iso_year, i32 iso_month, i32 iso_day, Object& calendar, FunctionObject* new_target)
+{
+    auto& vm = global_object.vm();
+
+    // 1. Assert: isoYear is an integer.
+    // 2. Assert: isoMonth is an integer.
+    // 3. Assert: isoDay is an integer.
+    // 4. Assert: Type(calendar) is Object.
+
+    // 5. If ! IsValidISODate(isoYear, isoMonth, isoDay) is false, throw a RangeError exception.
+    if (!is_valid_iso_date(iso_year, iso_month, iso_day)) {
+        vm.throw_exception<RangeError>(global_object, ErrorType::TemporalInvalidPlainDate);
+        return {};
+    }
+
+    // 6. If ! ISODateTimeWithinLimits(isoYear, isoMonth, isoDay, 12, 0, 0, 0, 0, 0) is false, throw a RangeError exception.
+    if (!iso_date_time_within_limits(global_object, iso_year, iso_month, iso_day, 12, 0, 0, 0, 0, 0)) {
+        vm.throw_exception<RangeError>(global_object, ErrorType::TemporalInvalidPlainDate);
+        return {};
+    }
+
+    // 7. If newTarget is not present, set it to %Temporal.PlainDate%.
+    if (!new_target)
+        new_target = global_object.temporal_plain_date_constructor();
+
+    // 8. Let object be ? OrdinaryCreateFromConstructor(newTarget, "%Temporal.PlainDate.prototype%", « [[InitializedTemporalDate]], [[ISOYear]], [[ISOMonth]], [[ISODay]], [[Calendar]] »).
+    // 9. Set object.[[ISOYear]] to isoYear.
+    // 10. Set object.[[ISOMonth]] to isoMonth.
+    // 11. Set object.[[ISODay]] to isoDay.
+    // 12. Set object.[[Calendar]] to calendar.
+    auto* object = ordinary_create_from_constructor<PlainDate>(global_object, *new_target, &GlobalObject::temporal_plain_date_prototype, iso_year, iso_month, iso_day, calendar);
+    if (vm.exception())
+        return {};
+
+    return object;
+}
+
 // 3.5.5 IsValidISODate ( year, month, day ), https://tc39.es/proposal-temporal/#sec-temporal-isvalidisodate
 bool is_valid_iso_date(i32 year, i32 month, i32 day)
 {