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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#include "builtin/temporal/TemporalFields.h"
#include "mozilla/Assertions.h"
#include "mozilla/Likely.h"
#include "mozilla/Maybe.h"
#include "mozilla/Range.h"
#include "mozilla/RangedPtr.h"
#include <algorithm>
#include <cstring>
#include <iterator>
#include <stdint.h>
#include <utility>
#include "jsnum.h"
#include "jspubtd.h"
#include "NamespaceImports.h"
#include "builtin/temporal/Temporal.h"
#include "ds/Sort.h"
#include "gc/Barrier.h"
#include "gc/Tracer.h"
#include "js/AllocPolicy.h"
#include "js/ComparisonOperators.h"
#include "js/ErrorReport.h"
#include "js/friend/ErrorMessages.h"
#include "js/GCVector.h"
#include "js/Id.h"
#include "js/Printer.h"
#include "js/RootingAPI.h"
#include "js/TracingAPI.h"
#include "js/TypeDecls.h"
#include "js/Utility.h"
#include "js/Value.h"
#include "util/Text.h"
#include "vm/BytecodeUtil.h"
#include "vm/JSAtomState.h"
#include "vm/JSContext.h"
#include "vm/JSObject.h"
#include "vm/PlainObject.h"
#include "vm/StringType.h"
#include "vm/SymbolType.h"
#include "vm/JSAtomUtils-inl.h"
#include "vm/ObjectOperations-inl.h"
using namespace js;
using namespace js::temporal;
void TemporalFields::trace(JSTracer* trc) {
TraceNullableRoot(trc, &monthCode, "TemporalFields::monthCode");
TraceNullableRoot(trc, &offset, "TemporalFields::offset");
TraceNullableRoot(trc, &era, "TemporalFields::era");
TraceRoot(trc, &timeZone, "TemporalFields::timeZone");
}
static PropertyName* ToPropertyName(JSContext* cx, TemporalField field) {
switch (field) {
case TemporalField::Year:
return cx->names().year;
case TemporalField::Month:
return cx->names().month;
case TemporalField::MonthCode:
return cx->names().monthCode;
case TemporalField::Day:
return cx->names().day;
case TemporalField::Hour:
return cx->names().hour;
case TemporalField::Minute:
return cx->names().minute;
case TemporalField::Second:
return cx->names().second;
case TemporalField::Millisecond:
return cx->names().millisecond;
case TemporalField::Microsecond:
return cx->names().microsecond;
case TemporalField::Nanosecond:
return cx->names().nanosecond;
case TemporalField::Offset:
return cx->names().offset;
case TemporalField::Era:
return cx->names().era;
case TemporalField::EraYear:
return cx->names().eraYear;
case TemporalField::TimeZone:
return cx->names().timeZone;
}
MOZ_CRASH("invalid temporal field name");
}
static const char* ToCString(TemporalField field) {
switch (field) {
case TemporalField::Year:
return "year";
case TemporalField::Month:
return "month";
case TemporalField::MonthCode:
return "monthCode";
case TemporalField::Day:
return "day";
case TemporalField::Hour:
return "hour";
case TemporalField::Minute:
return "minute";
case TemporalField::Second:
return "second";
case TemporalField::Millisecond:
return "millisecond";
case TemporalField::Microsecond:
return "microsecond";
case TemporalField::Nanosecond:
return "nanosecond";
case TemporalField::Offset:
return "offset";
case TemporalField::Era:
return "era";
case TemporalField::EraYear:
return "eraYear";
case TemporalField::TimeZone:
return "timeZone";
}
MOZ_CRASH("invalid temporal field name");
}
static JS::UniqueChars QuoteString(JSContext* cx, const char* str) {
Sprinter sprinter(cx);
if (!sprinter.init()) {
return nullptr;
}
mozilla::Range range(reinterpret_cast<const Latin1Char*>(str),
std::strlen(str));
QuoteString<QuoteTarget::String>(&sprinter, range);
return sprinter.release();
}
static JS::UniqueChars QuoteString(JSContext* cx, PropertyKey key) {
if (key.isString()) {
return QuoteString(cx, key.toString());
}
if (key.isInt()) {
Int32ToCStringBuf buf;
size_t length;
const char* str = Int32ToCString(&buf, key.toInt(), &length);
return DuplicateString(cx, str, length);
}
MOZ_ASSERT(key.isSymbol());
return QuoteString(cx, key.toSymbol()->description());
}
static mozilla::Maybe<TemporalField> ToTemporalField(JSContext* cx,
PropertyKey property) {
static constexpr TemporalField fieldNames[] = {
TemporalField::Year, TemporalField::Month,
TemporalField::MonthCode, TemporalField::Day,
TemporalField::Hour, TemporalField::Minute,
TemporalField::Second, TemporalField::Millisecond,
TemporalField::Microsecond, TemporalField::Nanosecond,
TemporalField::Offset, TemporalField::Era,
TemporalField::EraYear, TemporalField::TimeZone,
};
for (const auto& fieldName : fieldNames) {
auto* name = ToPropertyName(cx, fieldName);
if (property.isAtom(name)) {
return mozilla::Some(fieldName);
}
}
return mozilla::Nothing();
}
static JSString* ToPrimitiveAndRequireString(JSContext* cx,
Handle<Value> value) {
Rooted<Value> primitive(cx, value);
if (!ToPrimitive(cx, JSTYPE_STRING, &primitive)) {
return nullptr;
}
if (!primitive.isString()) {
ReportValueError(cx, JSMSG_UNEXPECTED_TYPE, JSDVG_IGNORE_STACK, primitive,
nullptr, "not a string");
return nullptr;
}
return primitive.toString();
}
static Value TemporalFieldDefaultValue(TemporalField field) {
switch (field) {
case TemporalField::Year:
case TemporalField::Month:
case TemporalField::MonthCode:
case TemporalField::Day:
case TemporalField::Offset:
case TemporalField::Era:
case TemporalField::EraYear:
case TemporalField::TimeZone:
return UndefinedValue();
case TemporalField::Hour:
case TemporalField::Minute:
case TemporalField::Second:
case TemporalField::Millisecond:
case TemporalField::Microsecond:
case TemporalField::Nanosecond:
return Int32Value(0);
}
MOZ_CRASH("invalid temporal field name");
}
static bool TemporalFieldConvertValue(JSContext* cx, TemporalField field,
MutableHandle<Value> value) {
const auto* name = ToCString(field);
switch (field) {
case TemporalField::Year:
case TemporalField::Hour:
case TemporalField::Minute:
case TemporalField::Second:
case TemporalField::Millisecond:
case TemporalField::Microsecond:
case TemporalField::Nanosecond:
case TemporalField::EraYear: {
double num;
if (!ToIntegerWithTruncation(cx, value, name, &num)) {
return false;
}
value.setNumber(num);
return true;
}
case TemporalField::Month:
case TemporalField::Day: {
double num;
if (!ToPositiveIntegerWithTruncation(cx, value, name, &num)) {
return false;
}
value.setNumber(num);
return true;
}
case TemporalField::MonthCode:
case TemporalField::Offset:
case TemporalField::Era: {
JSString* str = ToPrimitiveAndRequireString(cx, value);
if (!str) {
return false;
}
value.setString(str);
return true;
}
case TemporalField::TimeZone:
// NB: timeZone has no conversion function.
return true;
}
MOZ_CRASH("invalid temporal field name");
}
static int32_t ComparePropertyKey(PropertyKey x, PropertyKey y) {
MOZ_ASSERT(x.isAtom() || x.isInt());
MOZ_ASSERT(y.isAtom() || y.isInt());
if (MOZ_LIKELY(x.isAtom() && y.isAtom())) {
return CompareStrings(x.toAtom(), y.toAtom());
}
if (x.isInt() && y.isInt()) {
return x.toInt() - y.toInt();
}
uint32_t index = uint32_t(x.isInt() ? x.toInt() : y.toInt());
JSAtom* str = x.isAtom() ? x.toAtom() : y.toAtom();
char16_t buf[UINT32_CHAR_BUFFER_LENGTH];
mozilla::RangedPtr<char16_t> end(std::end(buf), buf, std::end(buf));
mozilla::RangedPtr<char16_t> start = BackfillIndexInCharBuffer(index, end);
int32_t result = CompareChars(start.get(), end - start, str);
return x.isInt() ? result : -result;
}
#ifdef DEBUG
static bool IsSorted(std::initializer_list<TemporalField> fieldNames) {
return std::is_sorted(fieldNames.begin(), fieldNames.end(),
[](auto x, auto y) {
auto* a = ToCString(x);
auto* b = ToCString(y);
return std::strcmp(a, b) < 0;
});
}
static bool IsSorted(const TemporalFieldNames& fieldNames) {
return std::is_sorted(
fieldNames.begin(), fieldNames.end(),
[](auto x, auto y) { return ComparePropertyKey(x, y) < 0; });
}
#endif
// clang-format off
//
// TODO: |fields| is often a built-in Temporal type, so we likely want to
// optimise for this case.
//
// Consider the case when PlainDate.prototype.toPlainMonthDay is called. The
// following steps are applied:
//
// 1. CalendarFields(calendar, «"day", "monthCode"») is called to retrieve the
// relevant calendar fields. For (most?) built-in calendars this will just
// return the input list «"day", "monthCode"».
// 2. PrepareTemporalFields(plainDate, «"day", "monthCode"») is called. This
// will access the properties `plainDate.day` and `plainDate.monthCode`.
// a. `plainDate.day` will call CalendarDay(calendar, plainDate).
// b. For built-in calendars, this will simply access `plainDate.[[IsoDay]]`.
// c. `plainDate.monthCode` will call CalendarMonthCode(calendar, plainDate).
// d. For built-in calendars, ISOMonthCode(plainDate.[[IsoMonth]]) is called.
// 3. CalendarMonthDayFromFields(calendar, {day, monthCode}) is called.
// 4. For built-in calendars, this calls PrepareTemporalFields({day, monthCode},
// «"day", "month", "monthCode", "year"», «"day"»).
// 5. The previous PrepareTemporalFields call is a no-op and returns {day, monthCode}.
// 6. Then ISOMonthDayFromFields({day, monthCode}, "constrain") gets called.
// 7. ResolveISOMonth(monthCode) is called to parse the just created `monthCode`.
// 8. RegulateISODate(referenceISOYear, month, day, "constrain") is called.
// 9. Finally CreateTemporalMonthDay is called to create the PlainMonthDay instance.
//
// All these steps could be simplified to just:
// 1. CreateTemporalMonthDay(referenceISOYear, plainDate.[[IsoMonth]], plainDate.[[IsoDay]]).
//
// When the following conditions are true:
// 1. The `plainDate` is a Temporal.PlainDate instance and has no overridden methods.
// 2. The `calendar` is a Temporal.Calendar instance and has no overridden methods.
// 3. Temporal.PlainDate.prototype and Temporal.Calendar.prototype are in their initial state.
// 4. Array iteration is still in its initial state. (Required by CalendarFields)
//
// PlainDate_toPlainMonthDay has an example implementation for this optimisation.
//
// clang-format on
/**
* PrepareTemporalFields ( fields, fieldNames, requiredFields )
*/
bool js::temporal::PrepareTemporalFields(
JSContext* cx, Handle<JSObject*> fields,
std::initializer_list<TemporalField> fieldNames,
std::initializer_list<TemporalField> requiredFields,
MutableHandle<TemporalFields> result) {
// Steps 1-3. (Not applicable in our implementation.)
// Step 4. (|fieldNames| is sorted in our implementation.)
MOZ_ASSERT(IsSorted(fieldNames));
// Step 5. (The list doesn't contain duplicates in our implementation.)
MOZ_ASSERT(std::adjacent_find(fieldNames.begin(), fieldNames.end()) ==
fieldNames.end());
// |requiredFields| is sorted and doesn't contain any duplicate elements.
MOZ_ASSERT(IsSorted(requiredFields));
MOZ_ASSERT(std::adjacent_find(requiredFields.begin(), requiredFields.end()) ==
requiredFields.end());
// Step 6.
Rooted<Value> value(cx);
for (auto fieldName : fieldNames) {
auto* property = ToPropertyName(cx, fieldName);
const auto* cstr = ToCString(fieldName);
// Step 6.a. (Not applicable in our implementation.)
// Step 6.b.i.
if (!GetProperty(cx, fields, fields, property, &value)) {
return false;
}
// Steps 6.b.ii-iii.
if (!value.isUndefined()) {
// Step 6.b.ii.1. (Not applicable in our implementation.)
// Steps 6.b.ii.2-3.
switch (fieldName) {
case TemporalField::Year:
if (!ToIntegerWithTruncation(cx, value, cstr, &result.year())) {
return false;
}
break;
case TemporalField::Month:
if (!ToPositiveIntegerWithTruncation(cx, value, cstr,
&result.month())) {
return false;
}
break;
case TemporalField::MonthCode: {
JSString* str = ToPrimitiveAndRequireString(cx, value);
if (!str) {
return false;
}
result.monthCode().set(str);
break;
}
case TemporalField::Day:
if (!ToPositiveIntegerWithTruncation(cx, value, cstr,
&result.day())) {
return false;
}
break;
case TemporalField::Hour:
if (!ToIntegerWithTruncation(cx, value, cstr, &result.hour())) {
return false;
}
break;
case TemporalField::Minute:
if (!ToIntegerWithTruncation(cx, value, cstr, &result.minute())) {
return false;
}
break;
case TemporalField::Second:
if (!ToIntegerWithTruncation(cx, value, cstr, &result.second())) {
return false;
}
break;
case TemporalField::Millisecond:
if (!ToIntegerWithTruncation(cx, value, cstr,
&result.millisecond())) {
return false;
}
break;
case TemporalField::Microsecond:
if (!ToIntegerWithTruncation(cx, value, cstr,
&result.microsecond())) {
return false;
}
break;
case TemporalField::Nanosecond:
if (!ToIntegerWithTruncation(cx, value, cstr, &result.nanosecond())) {
return false;
}
break;
case TemporalField::Offset: {
JSString* str = ToPrimitiveAndRequireString(cx, value);
if (!str) {
return false;
}
result.offset().set(str);
break;
}
case TemporalField::Era: {
JSString* str = ToPrimitiveAndRequireString(cx, value);
if (!str) {
return false;
}
result.era().set(str);
break;
}
case TemporalField::EraYear:
if (!ToIntegerWithTruncation(cx, value, cstr, &result.eraYear())) {
return false;
}
break;
case TemporalField::TimeZone:
// NB: TemporalField::TimeZone has no conversion function.
result.timeZone().set(value);
break;
}
} else {
// Step 6.b.iii.1.
if (std::find(requiredFields.begin(), requiredFields.end(), fieldName) !=
requiredFields.end()) {
if (auto chars = QuoteString(cx, cstr)) {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
JSMSG_TEMPORAL_MISSING_PROPERTY,
chars.get());
}
return false;
}
// `const` can be changed to `constexpr` when we switch to C++20.
const TemporalFields FallbackValues{};
// Steps 6.b.iii.2-3.
switch (fieldName) {
case TemporalField::Year:
result.year() = FallbackValues.year;
break;
case TemporalField::Month:
result.month() = FallbackValues.month;
break;
case TemporalField::MonthCode:
result.monthCode().set(FallbackValues.monthCode);
break;
case TemporalField::Day:
result.day() = FallbackValues.day;
break;
case TemporalField::Hour:
result.hour() = FallbackValues.hour;
break;
case TemporalField::Minute:
result.minute() = FallbackValues.minute;
break;
case TemporalField::Second:
result.second() = FallbackValues.second;
break;
case TemporalField::Millisecond:
result.millisecond() = FallbackValues.millisecond;
break;
case TemporalField::Microsecond:
result.microsecond() = FallbackValues.microsecond;
break;
case TemporalField::Nanosecond:
result.nanosecond() = FallbackValues.nanosecond;
break;
case TemporalField::Offset:
result.offset().set(FallbackValues.offset);
break;
case TemporalField::Era:
result.era().set(FallbackValues.era);
break;
case TemporalField::EraYear:
result.eraYear() = FallbackValues.eraYear;
break;
case TemporalField::TimeZone:
result.timeZone().set(FallbackValues.timeZone);
break;
}
}
// Steps 6.c-d. (Not applicable in our implementation.)
}
// Step 7. (Not applicable in our implementation.)
// Step 8.
return true;
}
/**
* PrepareTemporalFields ( fields, fieldNames, requiredFields [ ,
* duplicateBehaviour ] )
*/
PlainObject* js::temporal::PrepareTemporalFields(
JSContext* cx, Handle<JSObject*> fields,
Handle<TemporalFieldNames> fieldNames) {
// Step 1. (Not applicable in our implementation.)
// Step 2.
Rooted<PlainObject*> result(cx, NewPlainObjectWithProto(cx, nullptr));
if (!result) {
return nullptr;
}
// Step 3. (Not applicable in our implementation.)
// Step 4. (The list is already sorted in our implementation.)
MOZ_ASSERT(IsSorted(fieldNames));
// Step 5. (The list doesn't contain duplicates in our implementation.)
MOZ_ASSERT(std::adjacent_find(fieldNames.begin(), fieldNames.end()) ==
fieldNames.end());
// Step 6.
Rooted<Value> value(cx);
for (size_t i = 0; i < fieldNames.length(); i++) {
Handle<PropertyKey> property = fieldNames[i];
// Step 6.a.
MOZ_ASSERT(property != NameToId(cx->names().constructor));
MOZ_ASSERT(property != NameToId(cx->names().proto_));
// Step 6.b.i.
if (!GetProperty(cx, fields, fields, property, &value)) {
return nullptr;
}
// Steps 6.b.ii-iii.
if (auto fieldName = ToTemporalField(cx, property)) {
if (!value.isUndefined()) {
// Step 6.b.ii.1. (Not applicable in our implementation.)
// Step 6.b.ii.2.
if (!TemporalFieldConvertValue(cx, *fieldName, &value)) {
return nullptr;
}
} else {
// Step 6.b.iii.1. (Not applicable in our implementation.)
// Step 6.b.iii.2.
value = TemporalFieldDefaultValue(*fieldName);
}
}
// Steps 6.b.ii.3 and 6.b.iii.3.
if (!DefineDataProperty(cx, result, property, value)) {
return nullptr;
}
// Steps 6.c-d. (Not applicable in our implementation.)
}
// Step 7. (Not applicable in our implementation.)
// Step 8.
return result;
}
/**
* PrepareTemporalFields ( fields, fieldNames, requiredFields [ ,
* duplicateBehaviour ] )
*/
PlainObject* js::temporal::PrepareTemporalFields(
JSContext* cx, Handle<JSObject*> fields,
Handle<TemporalFieldNames> fieldNames,
std::initializer_list<TemporalField> requiredFields) {
// Step 1. (Not applicable in our implementation.)
// Step 2.
Rooted<PlainObject*> result(cx, NewPlainObjectWithProto(cx, nullptr));
if (!result) {
return nullptr;
}
// Step 3. (Not applicable in our implementation.)
// Step 4. (The list is already sorted in our implementation.)
MOZ_ASSERT(IsSorted(fieldNames));
// Step 5. (The list doesn't contain duplicates in our implementation.)
MOZ_ASSERT(std::adjacent_find(fieldNames.begin(), fieldNames.end()) ==
fieldNames.end());
// |requiredFields| is sorted and doesn't include any duplicate elements.
MOZ_ASSERT(IsSorted(requiredFields));
MOZ_ASSERT(std::adjacent_find(requiredFields.begin(), requiredFields.end()) ==
requiredFields.end());
// Step 6.
Rooted<Value> value(cx);
for (size_t i = 0; i < fieldNames.length(); i++) {
Handle<PropertyKey> property = fieldNames[i];
// Step 6.a.
MOZ_ASSERT(property != NameToId(cx->names().constructor));
MOZ_ASSERT(property != NameToId(cx->names().proto_));
// Step 6.b.i.
if (!GetProperty(cx, fields, fields, property, &value)) {
return nullptr;
}
// Steps 6.b.ii-iii.
if (auto fieldName = ToTemporalField(cx, property)) {
if (!value.isUndefined()) {
// Step 6.b.ii.1. (Not applicable in our implementation.)
// Step 6.b.ii.2.
if (!TemporalFieldConvertValue(cx, *fieldName, &value)) {
return nullptr;
}
} else {
// Step 6.b.iii.1.
if (std::find(requiredFields.begin(), requiredFields.end(),
*fieldName) != requiredFields.end()) {
if (auto chars = QuoteString(cx, property.toString())) {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
JSMSG_TEMPORAL_MISSING_PROPERTY,
chars.get());
}
return nullptr;
}
// Step 6.b.iii.2.
value = TemporalFieldDefaultValue(*fieldName);
}
}
// Steps 6.b.ii.3 and 6.b.iii.3.
if (!DefineDataProperty(cx, result, property, value)) {
return nullptr;
}
// Steps 6.c-d. (Not applicable in our implementation.)
}
// Step 7. (Not applicable in our implementation.)
// Step 8.
return result;
}
/**
* PrepareTemporalFields ( fields, fieldNames, requiredFields [ ,
* duplicateBehaviour ] )
*/
PlainObject* js::temporal::PreparePartialTemporalFields(
JSContext* cx, Handle<JSObject*> fields,
Handle<TemporalFieldNames> fieldNames) {
// Step 1. (Not applicable in our implementation.)
// Step 2.
Rooted<PlainObject*> result(cx, NewPlainObjectWithProto(cx, nullptr));
if (!result) {
return nullptr;
}
// Step 3.
bool any = false;
// Step 4. (The list is already sorted in our implementation.)
MOZ_ASSERT(IsSorted(fieldNames));
// Step 5. (The list doesn't contain duplicates in our implementation.)
MOZ_ASSERT(std::adjacent_find(fieldNames.begin(), fieldNames.end()) ==
fieldNames.end());
// Step 6.
Rooted<Value> value(cx);
for (size_t i = 0; i < fieldNames.length(); i++) {
Handle<PropertyKey> property = fieldNames[i];
// Step 6.a.
MOZ_ASSERT(property != NameToId(cx->names().constructor));
MOZ_ASSERT(property != NameToId(cx->names().proto_));
// Step 6.b.i.
if (!GetProperty(cx, fields, fields, property, &value)) {
return nullptr;
}
// Steps 6.b.ii-iii.
if (!value.isUndefined()) {
// Step 6.b.ii.1.
any = true;
// Step 6.b.ii.2.
if (auto fieldName = ToTemporalField(cx, property)) {
if (!TemporalFieldConvertValue(cx, *fieldName, &value)) {
return nullptr;
}
}
// Steps 6.b.ii.3.
if (!DefineDataProperty(cx, result, property, value)) {
return nullptr;
}
} else {
// Step 6.b.iii. (Not applicable in our implementation.)
}
// Steps 6.c-d. (Not applicable in our implementation.)
}
// Step 7.
if (!any) {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
JSMSG_TEMPORAL_MISSING_TEMPORAL_FIELDS);
return nullptr;
}
// Step 8.
return result;
}
/**
* Performs list-concatenation, removes any duplicates, and sorts the result.
*/
bool js::temporal::ConcatTemporalFieldNames(
const TemporalFieldNames& receiverFieldNames,
const TemporalFieldNames& inputFieldNames,
TemporalFieldNames& concatenatedFieldNames) {
MOZ_ASSERT(IsSorted(receiverFieldNames));
MOZ_ASSERT(IsSorted(inputFieldNames));
MOZ_ASSERT(concatenatedFieldNames.empty());
auto appendUnique = [&](auto key) {
if (concatenatedFieldNames.empty() ||
concatenatedFieldNames.back() != key) {
return concatenatedFieldNames.append(key);
}
return true;
};
size_t i = 0;
size_t j = 0;
// Append the names from |receiverFieldNames| and |inputFieldNames|.
while (i < receiverFieldNames.length() && j < inputFieldNames.length()) {
auto x = receiverFieldNames[i];
auto y = inputFieldNames[j];
PropertyKey z;
if (ComparePropertyKey(x, y) <= 0) {
z = x;
i++;
} else {
z = y;
j++;
}
if (!appendUnique(z)) {
return false;
}
}
// Append the remaining names from |receiverFieldNames|.
while (i < receiverFieldNames.length()) {
if (!appendUnique(receiverFieldNames[i++])) {
return false;
}
}
// Append the remaining names from |inputFieldNames|.
while (j < inputFieldNames.length()) {
if (!appendUnique(inputFieldNames[j++])) {
return false;
}
}
return true;
}
bool js::temporal::AppendSorted(
JSContext* cx, TemporalFieldNames& fieldNames,
std::initializer_list<TemporalField> additionalNames) {
// |fieldNames| is sorted and doesn't include any duplicates
MOZ_ASSERT(IsSorted(fieldNames));
MOZ_ASSERT(std::adjacent_find(fieldNames.begin(), fieldNames.end()) ==
fieldNames.end());
// |additionalNames| is non-empty, sorted, and doesn't include any duplicates.
MOZ_ASSERT(additionalNames.size() > 0);
MOZ_ASSERT(IsSorted(additionalNames));
MOZ_ASSERT(
std::adjacent_find(additionalNames.begin(), additionalNames.end()) ==
additionalNames.end());
// Allocate space for entries from |additionalNames|.
if (!fieldNames.growBy(additionalNames.size())) {
return false;
}
const auto* left = std::prev(fieldNames.end(), additionalNames.size());
const auto* right = additionalNames.end();
auto* out = fieldNames.end();
// Write backwards into the newly allocated space.
while (left != fieldNames.begin() && right != additionalNames.begin()) {
MOZ_ASSERT(out != fieldNames.begin());
auto x = *std::prev(left);
auto y = NameToId(ToPropertyName(cx, *std::prev(right)));
int32_t r = ComparePropertyKey(x, y);
// Reject duplicates per PrepareTemporalFields, step 6.c.
if (r == 0) {
if (auto chars = QuoteString(cx, x)) {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
JSMSG_TEMPORAL_DUPLICATE_PROPERTY,
chars.get());
}
return false;
}
// Insert the lexicographically greater key.
PropertyKey z;
if (r > 0) {
z = x;
left--;
} else {
z = y;
right--;
}
*--out = z;
}
// Avoid unnecessary copying if possible.
if (left == out) {
MOZ_ASSERT(right == additionalNames.begin());
return true;
}
// Prepend the remaining names from |fieldNames|.
while (left != fieldNames.begin()) {
MOZ_ASSERT(out != fieldNames.begin());
*--out = *--left;
}
// Prepend the remaining names from |additionalNames|.
while (right != additionalNames.begin()) {
MOZ_ASSERT(out != fieldNames.begin());
*--out = NameToId(ToPropertyName(cx, *--right));
}
// All field names were written into the result list.
MOZ_ASSERT(out == fieldNames.begin());
return true;
}
bool js::temporal::SortTemporalFieldNames(JSContext* cx,
TemporalFieldNames& fieldNames) {
// Create scratch space for MergeSort().
TemporalFieldNames scratch(cx);
if (!scratch.resize(fieldNames.length())) {
return false;
}
// Sort all field names in alphabetical order.
auto comparator = [](const auto& x, const auto& y, bool* lessOrEqual) {
*lessOrEqual = ComparePropertyKey(x, y) <= 0;
return true;
};
MOZ_ALWAYS_TRUE(MergeSort(fieldNames.begin(), fieldNames.length(),
scratch.begin(), comparator));
for (size_t i = 0; i < fieldNames.length(); i++) {
auto property = fieldNames[i];
// Reject "constructor" and "__proto__" per PrepareTemporalFields, step 6.a.
if (property == NameToId(cx->names().constructor) ||
property == NameToId(cx->names().proto_)) {
if (auto chars = QuoteString(cx, property)) {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
JSMSG_TEMPORAL_INVALID_PROPERTY, chars.get());
}
return false;
}
// Reject duplicates per PrepareTemporalFields, step 6.c.
if (i > 0 && property == fieldNames[i - 1]) {
if (auto chars = QuoteString(cx, property)) {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
JSMSG_TEMPORAL_DUPLICATE_PROPERTY,
chars.get());
}
return false;
}
}
return true;
}