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LibJS: Replace GetEpochFromISOParts with GetUTCEpochNanoseconds

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This is an editorial change in the Temporal spec. See:
1b051cc

Note that since Date's implementation of this AO uses Crypto bigints
rather than allocating JS bigints, this change has the fallout of
removing some unused VM parameters and adding an overload of the
IsValidEpochNanoseconds AO for use without a JS::BigInt.
This commit is contained in:
Timothy Flynn 2022-10-14 09:47:17 -04:00 • committed by Linus Groh
parent 4fbec2e8b3
commit 1a84dbcb07
11 changed files with 56 additions and 72 deletions
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19
Userland/Libraries/LibJS/Runtime/Temporal/Instant.cpp
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@ -9,6 +9,7 @@
#include <LibCrypto/BigInt/SignedBigInteger.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/Completion.h>
#include <LibJS/Runtime/Date.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Temporal/AbstractOperations.h>
#include <LibJS/Runtime/Temporal/Calendar.h>
@ -36,11 +37,17 @@ void Instant::visit_edges(Cell::Visitor& visitor)
// 8.5.1 IsValidEpochNanoseconds ( epochNanoseconds ), https://tc39.es/proposal-temporal/#sec-temporal-isvalidepochnanoseconds
bool is_valid_epoch_nanoseconds(BigInt const& epoch_nanoseconds)
{
return is_valid_epoch_nanoseconds(epoch_nanoseconds.big_integer());
}
// 8.5.1 IsValidEpochNanoseconds ( epochNanoseconds ), https://tc39.es/proposal-temporal/#sec-temporal-isvalidepochnanoseconds
bool is_valid_epoch_nanoseconds(Crypto::SignedBigInteger const& epoch_nanoseconds)
{
// 1. Assert: Type(epochNanoseconds) is BigInt.
// 2. If ℝ(epochNanoseconds) < nsMinInstant or ℝ(epochNanoseconds) > nsMaxInstant, then
if (epoch_nanoseconds.big_integer() < ns_min_instant || epoch_nanoseconds.big_integer() > ns_max_instant) {
if (epoch_nanoseconds < ns_min_instant || epoch_nanoseconds > ns_max_instant) {
// a. Return false.
return false;
}
@ -115,23 +122,23 @@ ThrowCompletionOr<BigInt*> parse_temporal_instant(VM& vm, String const& iso_stri
// 4. Assert: offsetString is not undefined.
VERIFY(offset_string.has_value());
// 5. Let utc be GetEpochFromISOParts(result.[[Year]], result.[[Month]], result.[[Day]], result.[[Hour]], result.[[Minute]], result.[[Second]], result.[[Millisecond]], result.[[Microsecond]], result.[[Nanosecond]]).
auto* utc = get_epoch_from_iso_parts(vm, result.year, result.month, result.day, result.hour, result.minute, result.second, result.millisecond, result.microsecond, result.nanosecond);
// 5. Let utc be GetUTCEpochNanoseconds(result.[[Year]], result.[[Month]], result.[[Day]], result.[[Hour]], result.[[Minute]], result.[[Second]], result.[[Millisecond]], result.[[Microsecond]], result.[[Nanosecond]]).
auto utc = get_utc_epoch_nanoseconds(result.year, result.month, result.day, result.hour, result.minute, result.second, result.millisecond, result.microsecond, result.nanosecond);
// 6. Let offsetNanoseconds be ? ParseTimeZoneOffsetString(offsetString).
auto offset_nanoseconds = TRY(parse_time_zone_offset_string(vm, *offset_string));
// 7. Let result be utc - ℤ(offsetNanoseconds).
auto* result_ns = js_bigint(vm, utc->big_integer().minus(Crypto::SignedBigInteger { offset_nanoseconds }));
auto result_ns = utc.minus(Crypto::SignedBigInteger { offset_nanoseconds });
// 8. If ! IsValidEpochNanoseconds(result) is false, then
if (!is_valid_epoch_nanoseconds(*result_ns)) {
if (!is_valid_epoch_nanoseconds(result_ns)) {
// a. Throw a RangeError exception.
return vm.throw_completion<RangeError>(ErrorType::TemporalInvalidEpochNanoseconds);
}
// 9. Return result.
return result_ns;
return js_bigint(vm, move(result_ns));
}
// 8.5.5 CompareEpochNanoseconds ( epochNanosecondsOne, epochNanosecondsTwo ), https://tc39.es/proposal-temporal/#sec-temporal-compareepochnanoseconds