Editorial: Remove Duration Records

These are no longer necessary. We should either be using Normalized
Duration Records (or their subcomponents, Date Duration Records and
Normalized Time Duration Records) or Temporal.Duration instances.

The records were still used in a few places: ToTemporalDurationRecord can
be inlined into ToTemporalDuration since that is its only caller, and
ParseTemporalDurationString can just return a Temporal.Duration instance
directly.

Author: ptomato

polyfill/lib/ecmascript.mjs

@@ -641,7 +641,7 @@ export function ParseTemporalTimeZoneString(stringIdent) {
   throw new ErrorCtor('this line should not be reached');
 }
 
-export function ParseTemporalDurationString(isoString) {
+function ParseTemporalDurationString(isoString) {
   const match = Call(RegExpPrototypeExec, PARSE.duration, [isoString]);
   if (!match) throw new RangeErrorCtor(`invalid duration: ${isoString}`);
   if (Call(ArrayPrototypeEvery, match, [(part, i) => i < 2 || part === undefined])) {
@@ -690,8 +690,19 @@ export function ParseTemporalDurationString(isoString) {
   seconds += MathTrunc(excessNanoseconds / 1e9) % 60;
   minutes += MathTrunc(excessNanoseconds / 60e9);
 
-  RejectDuration(years, months, weeks, days, hours, minutes, seconds, milliseconds, microseconds, nanoseconds);
-  return { years, months, weeks, days, hours, minutes, seconds, milliseconds, microseconds, nanoseconds };
+  const TemporalDuration = GetIntrinsic('%Temporal.Duration%');
+  return new TemporalDuration(
+    years,
+    months,
+    weeks,
+    days,
+    hours,
+    minutes,
+    seconds,
+    milliseconds,
+    microseconds,
+    nanoseconds
+  );
 }
 
 export function RegulateISODate(year, month, day, overflow) {
@@ -738,49 +749,6 @@ export function RegulateISOYearMonth(year, month, overflow) {
   return { year, month };
 }
 
-export function ToTemporalDurationRecord(item) {
-  if (Type(item) !== 'Object') {
-    return ParseTemporalDurationString(RequireString(item));
-  }
-  if (IsTemporalDuration(item)) {
-    return {
-      years: GetSlot(item, YEARS),
-      months: GetSlot(item, MONTHS),
-      weeks: GetSlot(item, WEEKS),
-      days: GetSlot(item, DAYS),
-      hours: GetSlot(item, HOURS),
-      minutes: GetSlot(item, MINUTES),
-      seconds: GetSlot(item, SECONDS),
-      milliseconds: GetSlot(item, MILLISECONDS),
-      microseconds: GetSlot(item, MICROSECONDS),
-      nanoseconds: GetSlot(item, NANOSECONDS)
-    };
-  }
-  const result = {
-    years: 0,
-    months: 0,
-    weeks: 0,
-    days: 0,
-    hours: 0,
-    minutes: 0,
-    seconds: 0,
-    milliseconds: 0,
-    microseconds: 0,
-    nanoseconds: 0
-  };
-  let partial = ToTemporalPartialDurationRecord(item);
-  for (let index = 0; index < DURATION_FIELDS.length; index++) {
-    const property = DURATION_FIELDS[index];
-    const value = partial[property];
-    if (value !== undefined) {
-      result[property] = value;
-    }
-  }
-  let { years, months, weeks, days, hours, minutes, seconds, milliseconds, microseconds, nanoseconds } = result;
-  RejectDuration(years, months, weeks, days, hours, minutes, seconds, milliseconds, microseconds, nanoseconds);
-  return result;
-}
-
 export function ToTemporalPartialDurationRecord(temporalDurationLike) {
   if (Type(temporalDurationLike) !== 'Object') {
     throw new TypeErrorCtor('invalid duration-like');
@@ -1312,20 +1280,41 @@ export function ToTemporalDateTime(item, options = undefined) {
 
 export function ToTemporalDuration(item) {
   if (IsTemporalDuration(item)) return item;
-  let { years, months, weeks, days, hours, minutes, seconds, milliseconds, microseconds, nanoseconds } =
-    ToTemporalDurationRecord(item);
+  if (Type(item) !== 'Object') {
+    return ParseTemporalDurationString(RequireString(item));
+  }
+  const result = {
+    years: 0,
+    months: 0,
+    weeks: 0,
+    days: 0,
+    hours: 0,
+    minutes: 0,
+    seconds: 0,
+    milliseconds: 0,
+    microseconds: 0,
+    nanoseconds: 0
+  };
+  let partial = ToTemporalPartialDurationRecord(item);
+  for (let index = 0; index < DURATION_FIELDS.length; index++) {
+    const property = DURATION_FIELDS[index];
+    const value = partial[property];
+    if (value !== undefined) {
+      result[property] = value;
+    }
+  }
   const TemporalDuration = GetIntrinsic('%Temporal.Duration%');
   return new TemporalDuration(
-    years,
-    months,
-    weeks,
-    days,
-    hours,
-    minutes,
-    seconds,
-    milliseconds,
-    microseconds,
-    nanoseconds
+    result.years,
+    result.months,
+    result.weeks,
+    result.days,
+    result.hours,
+    result.minutes,
+    result.seconds,
+    result.milliseconds,
+    result.microseconds,
+    result.nanoseconds
   );
 }
 

spec/abstractops.html

@@ -1747,7 +1747,7 @@ <h1>
     <h1>
       ParseTemporalDurationString (
         _isoString_: a String,
-      ): either a normal completion containing a Duration Record or a throw completion
+      ): either a normal completion containing a Temporal.Duration or a throw completion
     </h1>
     <dl class="header">
       <dt>description</dt>
@@ -1843,8 +1843,7 @@ <h1>
       1. Set _millisecondsMV_ to floor(_millisecondsMV_) × _factor_.
       1. Set _microsecondsMV_ to floor(_microsecondsMV_) × _factor_.
       1. Set _nanosecondsMV_ to floor(_nanosecondsMV_) × _factor_.
-      1. If IsValidDuration(_yearsMV_, _monthsMV_, _weeksMV_, _daysMV_, _hoursMV_, _minutesMV_, _secondsMV_, _millisecondsMV_, _microsecondsMV_, _nanosecondsMV_) is *false*, throw a *RangeError* exception.
-      1. Return CreateDurationRecord(_yearsMV_, _monthsMV_, _weeksMV_, _daysMV_, _hoursMV_, _minutesMV_, _secondsMV_, _millisecondsMV_, _microsecondsMV_, _nanosecondsMV_).
+      1. Return ? CreateTemporalDuration(_yearsMV_, _monthsMV_, _weeksMV_, _daysMV_, _hoursMV_, _minutesMV_, _secondsMV_, _millisecondsMV_, _microsecondsMV_, _nanosecondsMV_).
     </emu-alg>
   </emu-clause>