LibJS: Start implementing Temporal.Duration

This patch adds the Duration object itself, its constructor and
prototype (currently empty), and three required abstract operations.

Userland/Libraries/LibJS/Runtime/Temporal/DurationConstructor.cpp

@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2021, Linus Groh <linusg@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/Temporal/Duration.h>
+#include <LibJS/Runtime/Temporal/DurationConstructor.h>
+
+namespace JS::Temporal {
+
+// 7.1 The Temporal.Duration Constructor, https://tc39.es/proposal-temporal/#sec-temporal-duration-constructor
+DurationConstructor::DurationConstructor(GlobalObject& global_object)
+    : NativeFunction(vm().names.Duration.as_string(), *global_object.function_prototype())
+{
+}
+
+void DurationConstructor::initialize(GlobalObject& global_object)
+{
+    NativeFunction::initialize(global_object);
+
+    auto& vm = this->vm();
+
+    // 7.2.1 Temporal.Duration.prototype, https://tc39.es/proposal-temporal/#sec-temporal-duration-prototype
+    define_direct_property(vm.names.prototype, global_object.temporal_duration_prototype(), 0);
+
+    define_direct_property(vm.names.length, Value(0), Attribute::Configurable);
+}
+
+// 7.1.1 Temporal.Duration ( [ years [ , months [ , weeks [ , days [ , hours [ , minutes [ , seconds [ , milliseconds [ , microseconds [ , nanoseconds ] ] ] ] ] ] ] ] ] ] ), https://tc39.es/proposal-temporal/#sec-temporal.duration
+Value DurationConstructor::call()
+{
+    auto& vm = this->vm();
+
+    // 1. If NewTarget is undefined, then
+    // a. Throw a TypeError exception.
+    vm.throw_exception<TypeError>(global_object(), ErrorType::ConstructorWithoutNew, "Temporal.Duration");
+    return {};
+}
+
+// 7.1.1 Temporal.Duration ( [ years [ , months [ , weeks [ , days [ , hours [ , minutes [ , seconds [ , milliseconds [ , microseconds [ , nanoseconds ] ] ] ] ] ] ] ] ] ] ), https://tc39.es/proposal-temporal/#sec-temporal.duration
+Value DurationConstructor::construct(FunctionObject& new_target)
+{
+    auto& vm = this->vm();
+    auto& global_object = this->global_object();
+
+    // 2. Let y be ? ToIntegerOrInfinity(years).
+    auto y = vm.argument(0).to_integer_or_infinity(global_object);
+    if (vm.exception())
+        return {};
+
+    // 3. Let mo be ? ToIntegerOrInfinity(months).
+    auto mo = vm.argument(1).to_integer_or_infinity(global_object);
+    if (vm.exception())
+        return {};
+
+    // 4. Let w be ? ToIntegerOrInfinity(weeks).
+    auto w = vm.argument(2).to_integer_or_infinity(global_object);
+    if (vm.exception())
+        return {};
+
+    // 5. Let d be ? ToIntegerOrInfinity(days).
+    auto d = vm.argument(3).to_integer_or_infinity(global_object);
+    if (vm.exception())
+        return {};
+
+    // 6. Let h be ? ToIntegerOrInfinity(hours).
+    auto h = vm.argument(4).to_integer_or_infinity(global_object);
+    if (vm.exception())
+        return {};
+
+    // 7. Let m be ? ToIntegerOrInfinity(minutes).
+    auto m = vm.argument(5).to_integer_or_infinity(global_object);
+    if (vm.exception())
+        return {};
+
+    // 8. Let s be ? ToIntegerOrInfinity(seconds).
+    auto s = vm.argument(6).to_integer_or_infinity(global_object);
+    if (vm.exception())
+        return {};
+
+    // 9. Let ms be ? ToIntegerOrInfinity(milliseconds).
+    auto ms = vm.argument(7).to_integer_or_infinity(global_object);
+    if (vm.exception())
+        return {};
+
+    // 10. Let mis be ? ToIntegerOrInfinity(microseconds).
+    auto mis = vm.argument(8).to_integer_or_infinity(global_object);
+    if (vm.exception())
+        return {};
+
+    // 11. Let ns be ? ToIntegerOrInfinity(nanoseconds).
+    auto ns = vm.argument(9).to_integer_or_infinity(global_object);
+    if (vm.exception())
+        return {};
+
+    // 12. Return ? CreateTemporalDuration(y, mo, w, d, h, m, s, ms, mis, ns, NewTarget).
+    return create_temporal_duration(global_object, y, mo, w, d, h, m, s, ms, mis, ns, &new_target);
+}
+
+}