Bug 1847182 - Part 8: Synchronise time zone offset handling. r=dminor

Implements the changes from:
- tc39/proposal-temporal#2621
- tc39/proposal-temporal#2622
- tc39/proposal-temporal#2632
- tc39/proposal-temporal#2607

Differential Revision: https://phabricator.services.mozilla.com/D185412

Author: anba

js/public/friend/ErrorNumbers.msg

@@ -829,7 +829,7 @@ MSG_DEF(JSMSG_TEMPORAL_INVALID_UNIT_RANGE,          0, JSEXN_RANGEERR, "smallest
 MSG_DEF(JSMSG_TEMPORAL_INVALID_UNIT_OPTION,         2, JSEXN_RANGEERR, "{0} is not a valid {1} option in this context")
 MSG_DEF(JSMSG_TEMPORAL_INVALID_NUMBER,              1, JSEXN_RANGEERR, "{0} must be larger than zero")
 MSG_DEF(JSMSG_TEMPORAL_INVALID_INTEGER,             1, JSEXN_RANGEERR, "{0} must be an integer")
-MSG_DEF(JSMSG_TEMPORAL_INVALID_OBJECT,              2, JSEXN_TYPEERR, "{0} mustn't be a {1} object")
+MSG_DEF(JSMSG_TEMPORAL_INVALID_OBJECT,              2, JSEXN_TYPEERR, "{0} must not be a {1} object")
 MSG_DEF(JSMSG_TEMPORAL_MISSING_OPTION,              1, JSEXN_RANGEERR, "undefined {0} option")
 MSG_DEF(JSMSG_TEMPORAL_MISSING_PROPERTY,            1, JSEXN_TYPEERR, "{0} property is undefined")
 MSG_DEF(JSMSG_TEMPORAL_UNEXPECTED_PROPERTY,         1, JSEXN_TYPEERR, "{0} property is not undefined")
@@ -906,5 +906,6 @@ MSG_DEF(JSMSG_TEMPORAL_PARSER_INVALID_UTC_DESIGNATOR,   0, JSEXN_RANGEERR, "unex
 MSG_DEF(JSMSG_TEMPORAL_PARSER_INVALID_UTC_DESIGNATOR_WITHOUT_NAME, 0, JSEXN_RANGEERR, "unexpected UTC designator 'Z' without a bracketed time zone")
 MSG_DEF(JSMSG_TEMPORAL_PARSER_MONTH_DAY_CALENDAR_NOT_ISO8601, 0, JSEXN_RANGEERR, "Month-Day formats only support the \"iso8601\" calendar")
 MSG_DEF(JSMSG_TEMPORAL_PARSER_YEAR_MONTH_CALENDAR_NOT_ISO8601, 0, JSEXN_RANGEERR, "Year-Month formats only support the \"iso8601\" calendar")
+MSG_DEF(JSMSG_TEMPORAL_PARSER_INVALID_SUBMINUTE_TIMEZONE, 0, JSEXN_RANGEERR, "time zone offset must not contain seconds precision")
 
 //clang-format on

js/src/builtin/temporal/Duration.cpp

@@ -4085,7 +4085,7 @@ static bool ToRelativeTemporalObject(JSContext* cx, Handle<JSObject*> options,
         }
 
         // Step 8.b.
-        if (!ParseTimeZoneOffsetString(cx, offsetString, &offsetNs)) {
+        if (!ParseDateTimeUTCOffset(cx, offsetString, &offsetNs)) {
           return false;
         }
       } else {
@@ -4106,7 +4106,7 @@ static bool ToRelativeTemporalObject(JSContext* cx, Handle<JSObject*> options,
     bool isUTC;
     bool hasOffset;
     int64_t timeZoneOffset;
-    Rooted<JSString*> timeZoneName(cx);
+    Rooted<ParsedTimeZone> timeZoneName(cx);
     Rooted<JSString*> calendarString(cx);
     if (!ParseTemporalRelativeToString(cx, string, &dateTime, &isUTC,
                                        &hasOffset, &timeZoneOffset,
@@ -4150,7 +4150,7 @@ static bool ToRelativeTemporalObject(JSContext* cx, Handle<JSObject*> options,
       if (offsetBehaviour == OffsetBehaviour::Option) {
         MOZ_ASSERT(hasOffset);
 
-        // Steps 8.a-b.
+        // Step 8.a.
         offsetNs = timeZoneOffset;
       } else {
         // Step 9.

js/src/builtin/temporal/Instant.cpp

@@ -578,7 +578,7 @@ static bool ParseTemporalInstant(JSContext* cx, Handle<JSString*> isoString,
 
   // Step 4. (Not applicable in our implementation.)
 
-  // Step 6. (Reordered)
+  // Step 8. (Reordered)
   if (!ISODateTimeWithinLimits(dateTime)) {
     JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
                               JSMSG_TEMPORAL_INSTANT_INVALID);
@@ -588,6 +588,9 @@ static bool ParseTemporalInstant(JSContext* cx, Handle<JSString*> isoString,
   // Step 5.
   auto utc = GetUTCEpochNanoseconds(dateTime);
 
+  // FIXME: spec bug - ParseDateTimeUTCOffset is infallible
+  // https://github.com/tc39/proposal-temporal/issues/2637
+
   // Step 6.
   auto offsetNanoseconds = InstantSpan::fromNanoseconds(offset);
 

js/src/builtin/temporal/TemporalNow.cpp

@@ -29,6 +29,7 @@
 #include "builtin/temporal/PlainDate.h"
 #include "builtin/temporal/PlainDateTime.h"
 #include "builtin/temporal/PlainTime.h"
+#include "builtin/temporal/TemporalParser.h"
 #include "builtin/temporal/TemporalTypes.h"
 #include "builtin/temporal/TimeZone.h"
 #include "builtin/temporal/ZonedDateTime.h"