LibJS: Implement Temporal.PlainTime.prototype.since()

3 files changed, 138 insertions, 0 deletions

diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainTimePrototype.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/PlainTimePrototype.cpp
index a85061ca5c..6af80a41fe 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/PlainTimePrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainTimePrototype.cpp
@@ -47,6 +47,7 @@ void PlainTimePrototype::initialize(GlobalObject& global_object)
     define_native_function(vm.names.subtract, subtract, 1, attr);
     define_native_function(vm.names.with, with, 1, attr);
     define_native_function(vm.names.until, until, 1, attr);
+    define_native_function(vm.names.since, since, 1, attr);
     define_native_function(vm.names.round, round, 1, attr);
     define_native_function(vm.names.equals, equals, 1, attr);
     define_native_function(vm.names.toPlainDateTime, to_plain_date_time, 1, attr);
@@ -295,6 +296,53 @@ JS_DEFINE_NATIVE_FUNCTION(PlainTimePrototype::until)
     return TRY(create_temporal_duration(global_object, 0, 0, 0, 0, result.hours, result.minutes, result.seconds, result.milliseconds, result.microseconds, result.nanoseconds));
 }
 
+// 4.3.14 Temporal.PlainTime.prototype.since ( other [ , options ] ), https://tc39.es/proposal-temporal/#sec-temporal.plaintime.prototype.since
+JS_DEFINE_NATIVE_FUNCTION(PlainTimePrototype::since)
+{
+    // 1. Let temporalTime be the this value.
+    // 2. Perform ? RequireInternalSlot(temporalTime, [[InitializedTemporalTime]]).
+    auto* temporal_time = TRY(typed_this_object(global_object));
+
+    // 3. Set other to ? ToTemporalTime(other).
+    auto* other = TRY(to_temporal_time(global_object, vm.argument(0)));
+
+    // 4. Set options to ? GetOptionsObject(options).
+    auto* options = TRY(get_options_object(global_object, vm.argument(1)));
+
+    // 5. Let smallestUnit be ? ToSmallestTemporalUnit(options, « "year", "month", "week", "day" », "nanosecond").
+    auto smallest_unit = TRY(to_smallest_temporal_unit(global_object, *options, { "year"sv, "month"sv, "week"sv, "day"sv }, "nanosecond"sv));
+
+    // 6. Let largestUnit be ? ToLargestTemporalUnit(options, « "year", "month", "week", "day" », "auto", "hour").
+    auto largest_unit = TRY(to_largest_temporal_unit(global_object, *options, { "year"sv, "month"sv, "week"sv, "day"sv }, "auto"sv, "hour"sv));
+
+    // 7. Perform ? ValidateTemporalUnitRange(largestUnit, smallestUnit).
+    TRY(validate_temporal_unit_range(global_object, largest_unit, *smallest_unit));
+
+    // 8. Let roundingMode be ? ToTemporalRoundingMode(options, "trunc").
+    auto rounding_mode = TRY(to_temporal_rounding_mode(global_object, *options, "trunc"sv));
+
+    // 9. Set roundingMode to ! NegateTemporalRoundingMode(roundingMode).
+    rounding_mode = negate_temporal_rounding_mode(rounding_mode);
+
+    // 10. Let maximum be ! MaximumTemporalDurationRoundingIncrement(smallestUnit).
+    auto maximum = maximum_temporal_duration_rounding_increment(*smallest_unit);
+
+    // 11. Let roundingIncrement be ? ToTemporalRoundingIncrement(options, maximum, false).
+    auto rounding_increment = TRY(to_temporal_rounding_increment(global_object, *options, maximum.has_value() ? *maximum : Optional<double> {}, false));
+
+    // 12. Let result be ! DifferenceTime(other.[[ISOHour]], other.[[ISOMinute]], other.[[ISOSecond]], other.[[ISOMillisecond]], other.[[ISOMicrosecond]], other.[[ISONanosecond]], temporalTime.[[ISOHour]], temporalTime.[[ISOMinute]], temporalTime.[[ISOSecond]], temporalTime.[[ISOMillisecond]], temporalTime.[[ISOMicrosecond]], temporalTime.[[ISONanosecond]]).
+    auto result = difference_time(other->iso_hour(), other->iso_minute(), other->iso_second(), other->iso_millisecond(), other->iso_microsecond(), other->iso_nanosecond(), temporal_time->iso_hour(), temporal_time->iso_minute(), temporal_time->iso_second(), temporal_time->iso_millisecond(), temporal_time->iso_microsecond(), temporal_time->iso_nanosecond());
+
+    // 13. Set result to ? RoundDuration(0, 0, 0, 0, −result.[[Hours]], −result.[[Minutes]], −result.[[Seconds]], −result.[[Milliseconds]], −result.[[Microseconds]], −result.[[Nanoseconds]], roundingIncrement, smallestUnit, roundingMode).
+    auto rounded_result = TRY(round_duration(global_object, 0, 0, 0, 0, -result.hours, -result.minutes, -result.seconds, -result.milliseconds, -result.microseconds, -result.nanoseconds, rounding_increment, *smallest_unit, rounding_mode));
+
+    // 14. Set result to ! BalanceDuration(0, −result.[[Hours]], −result.[[Minutes]], −result.[[Seconds]], −result.[[Milliseconds]], −result.[[Microseconds]], −result.[[Nanoseconds]], largestUnit).
+    result = MUST(balance_duration(global_object, 0, -rounded_result.hours, -rounded_result.minutes, -rounded_result.seconds, -rounded_result.milliseconds, -rounded_result.microseconds, *js_bigint(vm, { (i32)-rounded_result.nanoseconds }), largest_unit));
+
+    // 15. Return ? CreateTemporalDuration(0, 0, 0, 0, result.[[Hours]], result.[[Minutes]], result.[[Seconds]], result.[[Milliseconds]], result.[[Microseconds]], result.[[Nanoseconds]]).
+    return TRY(create_temporal_duration(global_object, 0, 0, 0, 0, result.hours, result.minutes, result.seconds, result.milliseconds, result.microseconds, result.nanoseconds));
+}
+
 // 4.3.15 Temporal.PlainTime.prototype.round ( roundTo ), https://tc39.es/proposal-temporal/#sec-temporal.plaintime.prototype.round
 JS_DEFINE_NATIVE_FUNCTION(PlainTimePrototype::round)
 {
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainTimePrototype.h b/Userland/Libraries/LibJS/Runtime/Temporal/PlainTimePrototype.h
index 73453f4a01..5341989da2 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/PlainTimePrototype.h
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainTimePrototype.h
@@ -31,6 +31,7 @@ private:
     JS_DECLARE_NATIVE_FUNCTION(subtract);
     JS_DECLARE_NATIVE_FUNCTION(with);
     JS_DECLARE_NATIVE_FUNCTION(until);
+    JS_DECLARE_NATIVE_FUNCTION(since);
     JS_DECLARE_NATIVE_FUNCTION(round);
     JS_DECLARE_NATIVE_FUNCTION(equals);
     JS_DECLARE_NATIVE_FUNCTION(to_plain_date_time);
diff --git a/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainTime/PlainTime.prototype.since.js b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainTime/PlainTime.prototype.since.js
new file mode 100644
index 0000000000..134ef2961d
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/builtins/Temporal/PlainTime/PlainTime.prototype.since.js
@@ -0,0 +1,89 @@
+describe("correct behavior", () => {
+    test("length is 1", () => {
+        expect(Temporal.PlainTime.prototype.since).toHaveLength(1);
+    });
+
+    test("basic functionality", () => {
+        const values = [
+            [[0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0], "PT0S"],
+            [[2, 3, 4, 5, 6, 7], [1, 2, 3, 4, 5, 6], "PT1H1M1.001001001S"],
+            [[1, 2, 3, 4, 5, 6], [0, 0, 0, 0, 0, 0], "PT1H2M3.004005006S"],
+            [[0, 0, 0, 0, 0, 0], [1, 2, 3, 4, 5, 6], "-PT1H2M3.004005006S"],
+            [[23, 59, 59, 999, 999, 999], [0, 0, 0, 0, 0, 0], "PT23H59M59.999999999S"],
+            [[0, 0, 0, 0, 0, 0], [23, 59, 59, 999, 999, 999], "-PT23H59M59.999999999S"],
+        ];
+        for (const [args, argsOther, expected] of values) {
+            const plainTime = new Temporal.PlainTime(...args);
+            const other = new Temporal.PlainTime(...argsOther);
+            expect(plainTime.since(other).toString()).toBe(expected);
+        }
+    });
+
+    test("smallestUnit option", () => {
+        const plainTime = new Temporal.PlainTime(1, 2, 3, 4, 5, 6);
+        const other = new Temporal.PlainTime(0, 0, 0, 0, 0, 0);
+        const values = [
+            ["hour", "PT1H"],
+            ["minute", "PT1H2M"],
+            ["second", "PT1H2M3S"],
+            ["millisecond", "PT1H2M3.004S"],
+            ["microsecond", "PT1H2M3.004005S"],
+            ["nanosecond", "PT1H2M3.004005006S"],
+        ];
+        for (const [smallestUnit, expected] of values) {
+            expect(plainTime.since(other, { smallestUnit }).toString()).toBe(expected);
+        }
+    });
+
+    test("largestUnit option", () => {
+        const plainTime = new Temporal.PlainTime(1, 2, 3, 4, 5, 6);
+        const other = new Temporal.PlainTime(0, 0, 0, 0, 0, 0);
+        const values = [
+            ["hour", "PT1H2M3.004005006S"],
+            ["minute", "PT62M3.004005006S"],
+            ["second", "PT3723.004005006S"],
+            ["millisecond", "PT3723.004005006S"],
+            ["microsecond", "PT3723.004005006S"],
+            ["nanosecond", "PT3723.004005006S"],
+        ];
+        for (const [largestUnit, expected] of values) {
+            expect(plainTime.since(other, { largestUnit }).toString()).toBe(expected);
+        }
+    });
+});
+
+describe("errors", () => {
+    test("this value must be a Temporal.PlainTime object", () => {
+        expect(() => {
+            Temporal.PlainTime.prototype.since.call("foo", {});
+        }).toThrowWithMessage(TypeError, "Not an object of type Temporal.PlainTime");
+    });
+
+    test("disallowed smallestUnit option values", () => {
+        const values = ["year", "month", "week", "day"];
+        for (const smallestUnit of values) {
+            const plainTime = new Temporal.PlainTime();
+            const other = new Temporal.PlainTime();
+            expect(() => {
+                plainTime.since(other, { smallestUnit });
+            }).toThrowWithMessage(
+                RangeError,
+                `${smallestUnit} is not a valid value for option smallestUnit`
+            );
+        }
+    });
+
+    test("disallowed largestUnit option values", () => {
+        const values = ["year", "month", "week", "day"];
+        for (const largestUnit of values) {
+            const plainTime = new Temporal.PlainTime();
+            const other = new Temporal.PlainTime();
+            expect(() => {
+                plainTime.since(other, { largestUnit });
+            }).toThrowWithMessage(
+                RangeError,
+                `${largestUnit} is not a valid value for option largestUnit`
+            );
+        }
+    });
+});