Current File : /home/vacivi36/vittasync.vacivitta.com.br/vittasync/node/deps/v8/src/objects/intl-objects.cc
// Copyright 2013 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_INTL_SUPPORT
#error Internationalization is expected to be enabled.
#endif // V8_INTL_SUPPORT
#include "src/objects/intl-objects.h"
#include <algorithm>
#include <memory>
#include <string>
#include <vector>
#include "src/api/api-inl.h"
#include "src/base/strings.h"
#include "src/date/date.h"
#include "src/execution/isolate.h"
#include "src/execution/local-isolate.h"
#include "src/handles/global-handles.h"
#include "src/heap/factory.h"
#include "src/objects/js-collator-inl.h"
#include "src/objects/js-date-time-format-inl.h"
#include "src/objects/js-locale-inl.h"
#include "src/objects/js-locale.h"
#include "src/objects/js-number-format-inl.h"
#include "src/objects/js-temporal-objects.h"
#include "src/objects/managed-inl.h"
#include "src/objects/objects-inl.h"
#include "src/objects/option-utils.h"
#include "src/objects/property-descriptor.h"
#include "src/objects/smi.h"
#include "src/objects/string.h"
#include "src/strings/string-case.h"
#include "unicode/basictz.h"
#include "unicode/brkiter.h"
#include "unicode/calendar.h"
#include "unicode/coll.h"
#include "unicode/datefmt.h"
#include "unicode/decimfmt.h"
#include "unicode/formattedvalue.h"
#include "unicode/localebuilder.h"
#include "unicode/localematcher.h"
#include "unicode/locid.h"
#include "unicode/normalizer2.h"
#include "unicode/numberformatter.h"
#include "unicode/numfmt.h"
#include "unicode/numsys.h"
#include "unicode/timezone.h"
#include "unicode/ures.h"
#include "unicode/ustring.h"
#include "unicode/uvernum.h" // U_ICU_VERSION_MAJOR_NUM
#define XSTR(s) STR(s)
#define STR(s) #s
static_assert(
V8_MINIMUM_ICU_VERSION <= U_ICU_VERSION_MAJOR_NUM,
"v8 is required to build with ICU " XSTR(V8_MINIMUM_ICU_VERSION) " and up");
#undef STR
#undef XSTR
namespace v8 {
namespace internal {
namespace {
constexpr uint8_t kToLower[256] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B,
0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23,
0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B,
0x3C, 0x3D, 0x3E, 0x3F, 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72, 0x73,
0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F,
0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x6B,
0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, 0x7F, 0x80, 0x81, 0x82, 0x83,
0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B,
0x9C, 0x9D, 0x9E, 0x9F, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB0, 0xB1, 0xB2, 0xB3,
0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF,
0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xEB,
0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xD7,
0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xDF, 0xE0, 0xE1, 0xE2, 0xE3,
0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB,
0xFC, 0xFD, 0xFE, 0xFF,
};
inline constexpr uint16_t ToLatin1Lower(uint16_t ch) {
return static_cast<uint16_t>(kToLower[ch]);
}
// Does not work for U+00DF (sharp-s), U+00B5 (micron), U+00FF.
inline constexpr uint16_t ToLatin1Upper(uint16_t ch) {
DCHECK(ch != 0xDF && ch != 0xB5 && ch != 0xFF);
return ch &
~((IsAsciiLower(ch) || (((ch & 0xE0) == 0xE0) && ch != 0xF7)) << 5);
}
template <typename Char>
bool ToUpperFastASCII(base::Vector<const Char> src,
Handle<SeqOneByteString> result) {
// Do a faster loop for the case where all the characters are ASCII.
uint16_t ored = 0;
int32_t index = 0;
for (auto it = src.begin(); it != src.end(); ++it) {
uint16_t ch = static_cast<uint16_t>(*it);
ored |= ch;
result->SeqOneByteStringSet(index++, ToAsciiUpper(ch));
}
return !(ored & ~0x7F);
}
const uint16_t sharp_s = 0xDF;
template <typename Char>
bool ToUpperOneByte(base::Vector<const Char> src, uint8_t* dest,
int* sharp_s_count) {
// Still pretty-fast path for the input with non-ASCII Latin-1 characters.
// There are two special cases.
// 1. U+00B5 and U+00FF are mapped to a character beyond U+00FF.
// 2. Lower case sharp-S converts to "SS" (two characters)
*sharp_s_count = 0;
for (auto it = src.begin(); it != src.end(); ++it) {
uint16_t ch = static_cast<uint16_t>(*it);
if (V8_UNLIKELY(ch == sharp_s)) {
++(*sharp_s_count);
continue;
}
if (V8_UNLIKELY(ch == 0xB5 || ch == 0xFF)) {
// Since this upper-cased character does not fit in an 8-bit string, we
// need to take the 16-bit path.
return false;
}
*dest++ = ToLatin1Upper(ch);
}
return true;
}
template <typename Char>
void ToUpperWithSharpS(base::Vector<const Char> src,
Handle<SeqOneByteString> result) {
int32_t dest_index = 0;
for (auto it = src.begin(); it != src.end(); ++it) {
uint16_t ch = static_cast<uint16_t>(*it);
if (ch == sharp_s) {
result->SeqOneByteStringSet(dest_index++, 'S');
result->SeqOneByteStringSet(dest_index++, 'S');
} else {
result->SeqOneByteStringSet(dest_index++, ToLatin1Upper(ch));
}
}
}
inline int FindFirstUpperOrNonAscii(Tagged<String> s, int length) {
for (int index = 0; index < length; ++index) {
uint16_t ch = s->Get(index);
if (V8_UNLIKELY(IsAsciiUpper(ch) || ch & ~0x7F)) {
return index;
}
}
return length;
}
const UChar* GetUCharBufferFromFlat(const String::FlatContent& flat,
std::unique_ptr<base::uc16[]>* dest,
int32_t length) {
DCHECK(flat.IsFlat());
if (flat.IsOneByte()) {
if (!*dest) {
dest->reset(NewArray<base::uc16>(length));
CopyChars(dest->get(), flat.ToOneByteVector().begin(), length);
}
return reinterpret_cast<const UChar*>(dest->get());
} else {
return reinterpret_cast<const UChar*>(flat.ToUC16Vector().begin());
}
}
template <typename T>
MaybeHandle<T> New(Isolate* isolate, Handle<JSFunction> constructor,
Handle<Object> locales, Handle<Object> options,
const char* method_name) {
Handle<Map> map;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, map,
JSFunction::GetDerivedMap(isolate, constructor, constructor), T);
return T::New(isolate, map, locales, options, method_name);
}
} // namespace
const uint8_t* Intl::ToLatin1LowerTable() { return &kToLower[0]; }
icu::UnicodeString Intl::ToICUUnicodeString(Isolate* isolate,
Handle<String> string, int offset) {
DCHECK(string->IsFlat());
DisallowGarbageCollection no_gc;
std::unique_ptr<base::uc16[]> sap;
// Short one-byte strings can be expanded on the stack to avoid allocating a
// temporary buffer.
constexpr int kShortStringSize = 80;
UChar short_string_buffer[kShortStringSize];
const UChar* uchar_buffer = nullptr;
const String::FlatContent& flat = string->GetFlatContent(no_gc);
int32_t length = string->length();
DCHECK_LE(offset, length);
if (flat.IsOneByte() && length <= kShortStringSize) {
CopyChars(short_string_buffer, flat.ToOneByteVector().begin(), length);
uchar_buffer = short_string_buffer;
} else {
uchar_buffer = GetUCharBufferFromFlat(flat, &sap, length);
}
return icu::UnicodeString(uchar_buffer + offset, length - offset);
}
namespace {
icu::StringPiece ToICUStringPiece(Isolate* isolate, Handle<String> string,
int offset = 0) {
DCHECK(string->IsFlat());
DisallowGarbageCollection no_gc;
const String::FlatContent& flat = string->GetFlatContent(no_gc);
if (!flat.IsOneByte()) return icu::StringPiece();
int32_t length = string->length();
const char* char_buffer =
reinterpret_cast<const char*>(flat.ToOneByteVector().begin());
if (!String::IsAscii(char_buffer, length)) {
return icu::StringPiece();
}
return icu::StringPiece(char_buffer + offset, length - offset);
}
MaybeHandle<String> LocaleConvertCase(Isolate* isolate, Handle<String> s,
bool is_to_upper, const char* lang) {
auto case_converter = is_to_upper ? u_strToUpper : u_strToLower;
int32_t src_length = s->length();
int32_t dest_length = src_length;
UErrorCode status;
Handle<SeqTwoByteString> result;
std::unique_ptr<base::uc16[]> sap;
if (dest_length == 0) return ReadOnlyRoots(isolate).empty_string_handle();
// This is not a real loop. It'll be executed only once (no overflow) or
// twice (overflow).
for (int i = 0; i < 2; ++i) {
// Case conversion can increase the string length (e.g. sharp-S => SS) so
// that we have to handle RangeError exceptions here.
ASSIGN_RETURN_ON_EXCEPTION(
isolate, result, isolate->factory()->NewRawTwoByteString(dest_length),
String);
DisallowGarbageCollection no_gc;
DCHECK(s->IsFlat());
String::FlatContent flat = s->GetFlatContent(no_gc);
const UChar* src = GetUCharBufferFromFlat(flat, &sap, src_length);
status = U_ZERO_ERROR;
dest_length =
case_converter(reinterpret_cast<UChar*>(result->GetChars(no_gc)),
dest_length, src, src_length, lang, &status);
if (status != U_BUFFER_OVERFLOW_ERROR) break;
}
// In most cases, the output will fill the destination buffer completely
// leading to an unterminated string (U_STRING_NOT_TERMINATED_WARNING).
// Only in rare cases, it'll be shorter than the destination buffer and
// |result| has to be truncated.
DCHECK(U_SUCCESS(status));
if (V8_LIKELY(status == U_STRING_NOT_TERMINATED_WARNING)) {
DCHECK(dest_length == result->length());
return result;
}
DCHECK(dest_length < result->length());
return SeqString::Truncate(isolate, result, dest_length);
}
} // namespace
// A stripped-down version of ConvertToLower that can only handle flat one-byte
// strings and does not allocate. Note that {src} could still be, e.g., a
// one-byte sliced string with a two-byte parent string.
// Called from TF builtins.
Tagged<String> Intl::ConvertOneByteToLower(Tagged<String> src,
Tagged<String> dst) {
DCHECK_EQ(src->length(), dst->length());
DCHECK(src->IsOneByteRepresentation());
DCHECK(src->IsFlat());
DCHECK(IsSeqOneByteString(dst));
DisallowGarbageCollection no_gc;
const int length = src->length();
String::FlatContent src_flat = src->GetFlatContent(no_gc);
uint8_t* dst_data = SeqOneByteString::cast(dst)->GetChars(no_gc);
if (src_flat.IsOneByte()) {
const uint8_t* src_data = src_flat.ToOneByteVector().begin();
bool has_changed_character = false;
int index_to_first_unprocessed =
FastAsciiConvert<true>(reinterpret_cast<char*>(dst_data),
reinterpret_cast<const char*>(src_data), length,
&has_changed_character);
if (index_to_first_unprocessed == length) {
return has_changed_character ? dst : src;
}
// If not ASCII, we keep the result up to index_to_first_unprocessed and
// process the rest.
for (int index = index_to_first_unprocessed; index < length; ++index) {
dst_data[index] = ToLatin1Lower(static_cast<uint16_t>(src_data[index]));
}
} else {
DCHECK(src_flat.IsTwoByte());
int index_to_first_unprocessed = FindFirstUpperOrNonAscii(src, length);
if (index_to_first_unprocessed == length) return src;
const uint16_t* src_data = src_flat.ToUC16Vector().begin();
CopyChars(dst_data, src_data, index_to_first_unprocessed);
for (int index = index_to_first_unprocessed; index < length; ++index) {
dst_data[index] = ToLatin1Lower(static_cast<uint16_t>(src_data[index]));
}
}
return dst;
}
MaybeHandle<String> Intl::ConvertToLower(Isolate* isolate, Handle<String> s) {
if (!s->IsOneByteRepresentation()) {
// Use a slower implementation for strings with characters beyond U+00FF.
return LocaleConvertCase(isolate, s, false, "");
}
int length = s->length();
// We depend here on the invariant that the length of a Latin1
// string is invariant under ToLowerCase, and the result always
// fits in the Latin1 range in the *root locale*. It does not hold
// for ToUpperCase even in the root locale.
// Scan the string for uppercase and non-ASCII characters for strings
// shorter than a machine-word without any memory allocation overhead.
// TODO(jshin): Apply this to a longer input by breaking FastAsciiConvert()
// to two parts, one for scanning the prefix with no change and the other for
// handling ASCII-only characters.
bool is_short = length < static_cast<int>(sizeof(uintptr_t));
if (is_short) {
bool is_lower_ascii = FindFirstUpperOrNonAscii(*s, length) == length;
if (is_lower_ascii) return s;
}
Handle<SeqOneByteString> result =
isolate->factory()->NewRawOneByteString(length).ToHandleChecked();
return Handle<String>(Intl::ConvertOneByteToLower(*s, *result), isolate);
}
MaybeHandle<String> Intl::ConvertToUpper(Isolate* isolate, Handle<String> s) {
int32_t length = s->length();
if (s->IsOneByteRepresentation() && length > 0) {
Handle<SeqOneByteString> result =
isolate->factory()->NewRawOneByteString(length).ToHandleChecked();
DCHECK(s->IsFlat());
int sharp_s_count;
bool is_result_single_byte;
{
DisallowGarbageCollection no_gc;
String::FlatContent flat = s->GetFlatContent(no_gc);
uint8_t* dest = result->GetChars(no_gc);
if (flat.IsOneByte()) {
base::Vector<const uint8_t> src = flat.ToOneByteVector();
bool has_changed_character = false;
int index_to_first_unprocessed = FastAsciiConvert<false>(
reinterpret_cast<char*>(result->GetChars(no_gc)),
reinterpret_cast<const char*>(src.begin()), length,
&has_changed_character);
if (index_to_first_unprocessed == length) {
return has_changed_character ? result : s;
}
// If not ASCII, we keep the result up to index_to_first_unprocessed and
// process the rest.
is_result_single_byte =
ToUpperOneByte(src.SubVector(index_to_first_unprocessed, length),
dest + index_to_first_unprocessed, &sharp_s_count);
} else {
DCHECK(flat.IsTwoByte());
base::Vector<const uint16_t> src = flat.ToUC16Vector();
if (ToUpperFastASCII(src, result)) return result;
is_result_single_byte = ToUpperOneByte(src, dest, &sharp_s_count);
}
}
// Go to the full Unicode path if there are characters whose uppercase
// is beyond the Latin-1 range (cannot be represented in OneByteString).
if (V8_UNLIKELY(!is_result_single_byte)) {
return LocaleConvertCase(isolate, s, true, "");
}
if (sharp_s_count == 0) return result;
// We have sharp_s_count sharp-s characters, but the result is still
// in the Latin-1 range.
ASSIGN_RETURN_ON_EXCEPTION(
isolate, result,
isolate->factory()->NewRawOneByteString(length + sharp_s_count),
String);
DisallowGarbageCollection no_gc;
String::FlatContent flat = s->GetFlatContent(no_gc);
if (flat.IsOneByte()) {
ToUpperWithSharpS(flat.ToOneByteVector(), result);
} else {
ToUpperWithSharpS(flat.ToUC16Vector(), result);
}
return result;
}
return LocaleConvertCase(isolate, s, true, "");
}
std::string Intl::GetNumberingSystem(const icu::Locale& icu_locale) {
// Ugly hack. ICU doesn't expose numbering system in any way, so we have
// to assume that for given locale NumberingSystem constructor produces the
// same digits as NumberFormat/Calendar would.
UErrorCode status = U_ZERO_ERROR;
std::unique_ptr<icu::NumberingSystem> numbering_system(
icu::NumberingSystem::createInstance(icu_locale, status));
if (U_SUCCESS(status) && !numbering_system->isAlgorithmic()) {
return numbering_system->getName();
}
return "latn";
}
namespace {
Maybe<icu::Locale> CreateICULocale(const std::string& bcp47_locale) {
DisallowGarbageCollection no_gc;
// Convert BCP47 into ICU locale format.
UErrorCode status = U_ZERO_ERROR;
icu::Locale icu_locale = icu::Locale::forLanguageTag(bcp47_locale, status);
if (U_FAILURE(status) || icu_locale.isBogus()) {
return Nothing<icu::Locale>();
}
return Just(icu_locale);
}
} // anonymous namespace
// static
MaybeHandle<String> Intl::ToString(Isolate* isolate,
const icu::UnicodeString& string) {
return isolate->factory()->NewStringFromTwoByte(base::Vector<const uint16_t>(
reinterpret_cast<const uint16_t*>(string.getBuffer()), string.length()));
}
MaybeHandle<String> Intl::ToString(Isolate* isolate,
const icu::UnicodeString& string,
int32_t begin, int32_t end) {
return Intl::ToString(isolate, string.tempSubStringBetween(begin, end));
}
namespace {
Handle<JSObject> InnerAddElement(Isolate* isolate, Handle<JSArray> array,
int index, Handle<String> field_type_string,
Handle<String> value) {
// let element = $array[$index] = {
// type: $field_type_string,
// value: $value
// }
// return element;
Factory* factory = isolate->factory();
Handle<JSObject> element = factory->NewJSObject(isolate->object_function());
JSObject::AddProperty(isolate, element, factory->type_string(),
field_type_string, NONE);
JSObject::AddProperty(isolate, element, factory->value_string(), value, NONE);
// TODO(victorgomes): Temporarily forcing a fatal error here in case of
// overflow, until Intl::AddElement can handle exceptions.
if (JSObject::AddDataElement(array, index, element, NONE).IsNothing()) {
FATAL("Fatal JavaScript invalid size error when adding element");
UNREACHABLE();
}
return element;
}
} // namespace
void Intl::AddElement(Isolate* isolate, Handle<JSArray> array, int index,
Handle<String> field_type_string, Handle<String> value) {
// Same as $array[$index] = {type: $field_type_string, value: $value};
InnerAddElement(isolate, array, index, field_type_string, value);
}
void Intl::AddElement(Isolate* isolate, Handle<JSArray> array, int index,
Handle<String> field_type_string, Handle<String> value,
Handle<String> additional_property_name,
Handle<String> additional_property_value) {
// Same as $array[$index] = {
// type: $field_type_string, value: $value,
// $additional_property_name: $additional_property_value
// }
Handle<JSObject> element =
InnerAddElement(isolate, array, index, field_type_string, value);
JSObject::AddProperty(isolate, element, additional_property_name,
additional_property_value, NONE);
}
namespace {
// Build the shortened locale; eg, convert xx_Yyyy_ZZ to xx_ZZ.
//
// If locale has a script tag then return true and the locale without the
// script else return false and an empty string.
bool RemoveLocaleScriptTag(const std::string& icu_locale,
std::string* locale_less_script) {
icu::Locale new_locale = icu::Locale::createCanonical(icu_locale.c_str());
const char* icu_script = new_locale.getScript();
if (icu_script == nullptr || strlen(icu_script) == 0) {
*locale_less_script = std::string();
return false;
}
const char* icu_language = new_locale.getLanguage();
const char* icu_country = new_locale.getCountry();
icu::Locale short_locale = icu::Locale(icu_language, icu_country);
*locale_less_script = short_locale.getName();
return true;
}
bool ValidateResource(const icu::Locale locale, const char* path,
const char* key) {
bool result = false;
UErrorCode status = U_ZERO_ERROR;
UResourceBundle* bundle = ures_open(path, locale.getName(), &status);
if (bundle != nullptr && status == U_ZERO_ERROR) {
if (key == nullptr) {
result = true;
} else {
UResourceBundle* key_bundle =
ures_getByKey(bundle, key, nullptr, &status);
result = key_bundle != nullptr && (status == U_ZERO_ERROR);
ures_close(key_bundle);
}
}
ures_close(bundle);
if (!result) {
if ((locale.getCountry()[0] != '\0') && (locale.getScript()[0] != '\0')) {
// Fallback to try without country.
std::string without_country(locale.getLanguage());
without_country = without_country.append("-").append(locale.getScript());
return ValidateResource(without_country.c_str(), path, key);
} else if ((locale.getCountry()[0] != '\0') ||
(locale.getScript()[0] != '\0')) {
// Fallback to try with only language.
std::string language(locale.getLanguage());
return ValidateResource(language.c_str(), path, key);
}
}
return result;
}
} // namespace
std::set<std::string> Intl::BuildLocaleSet(
const std::vector<std::string>& icu_available_locales, const char* path,
const char* validate_key) {
std::set<std::string> locales;
for (const std::string& locale : icu_available_locales) {
if (path != nullptr || validate_key != nullptr) {
if (!ValidateResource(icu::Locale(locale.c_str()), path, validate_key)) {
// FIXME(chromium:1215606) Find a beter fix for nb->no fallback
if (locale != "nb") {
continue;
}
// Try no for nb
if (!ValidateResource(icu::Locale("no"), path, validate_key)) {
continue;
}
}
}
locales.insert(locale);
std::string shortened_locale;
if (RemoveLocaleScriptTag(locale, &shortened_locale)) {
std::replace(shortened_locale.begin(), shortened_locale.end(), '_', '-');
locales.insert(shortened_locale);
}
}
return locales;
}
Maybe<std::string> Intl::ToLanguageTag(const icu::Locale& locale) {
UErrorCode status = U_ZERO_ERROR;
std::string res = locale.toLanguageTag<std::string>(status);
if (U_FAILURE(status)) {
return Nothing<std::string>();
}
DCHECK(U_SUCCESS(status));
return Just(res);
}
// See ecma402/#legacy-constructor.
MaybeHandle<Object> Intl::LegacyUnwrapReceiver(Isolate* isolate,
Handle<JSReceiver> receiver,
Handle<JSFunction> constructor,
bool has_initialized_slot) {
Handle<Object> obj_ordinary_has_instance;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, obj_ordinary_has_instance,
Object::OrdinaryHasInstance(isolate, constructor, receiver), Object);
bool ordinary_has_instance =
Object::BooleanValue(*obj_ordinary_has_instance, isolate);
// 2. If receiver does not have an [[Initialized...]] internal slot
// and ? OrdinaryHasInstance(constructor, receiver) is true, then
if (!has_initialized_slot && ordinary_has_instance) {
// 2. a. Let new_receiver be ? Get(receiver, %Intl%.[[FallbackSymbol]]).
Handle<Object> new_receiver;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, new_receiver,
JSReceiver::GetProperty(isolate, receiver,
isolate->factory()->intl_fallback_symbol()),
Object);
return new_receiver;
}
return receiver;
}
namespace {
bool IsTwoLetterLanguage(const std::string& locale) {
// Two letters, both in range 'a'-'z'...
return locale.length() == 2 && IsAsciiLower(locale[0]) &&
IsAsciiLower(locale[1]);
}
bool IsDeprecatedOrLegacyLanguage(const std::string& locale) {
// Check if locale is one of the deprecated language tags:
return locale == "in" || locale == "iw" || locale == "ji" || locale == "jw" ||
locale == "mo" ||
// Check if locale is one of the legacy language tags:
locale == "sh" || locale == "tl" || locale == "no";
}
bool IsStructurallyValidLanguageTag(const std::string& tag) {
return JSLocale::StartsWithUnicodeLanguageId(tag);
}
// Canonicalize the locale.
// https://tc39.github.io/ecma402/#sec-canonicalizelanguagetag,
// including type check and structural validity check.
Maybe<std::string> CanonicalizeLanguageTag(Isolate* isolate,
const std::string& locale_in) {
std::string locale = locale_in;
if (locale.length() == 0 ||
!String::IsAscii(locale.data(), static_cast<int>(locale.length()))) {
THROW_NEW_ERROR_RETURN_VALUE(
isolate,
NewRangeError(
MessageTemplate::kInvalidLanguageTag,
isolate->factory()->NewStringFromAsciiChecked(locale.c_str())),
Nothing<std::string>());
}
// Optimize for the most common case: a 2-letter language code in the
// canonical form/lowercase that is not one of the deprecated codes
// (in, iw, ji, jw). Don't check for ~70 of 3-letter deprecated language
// codes. Instead, let them be handled by ICU in the slow path. However,
// fast-track 'fil' (3-letter canonical code).
if ((IsTwoLetterLanguage(locale) && !IsDeprecatedOrLegacyLanguage(locale)) ||
locale == "fil") {
return Just(locale);
}
// Because per BCP 47 2.1.1 language tags are case-insensitive, lowercase
// the input before any more check.
std::transform(locale.begin(), locale.end(), locale.begin(), ToAsciiLower);
// // ECMA 402 6.2.3
// TODO(jshin): uloc_{for,to}TanguageTag can fail even for a structually valid
// language tag if it's too long (much longer than 100 chars). Even if we
// allocate a longer buffer, ICU will still fail if it's too long. Either
// propose to Ecma 402 to put a limit on the locale length or change ICU to
// handle long locale names better. See
// https://unicode-org.atlassian.net/browse/ICU-13417
UErrorCode error = U_ZERO_ERROR;
// uloc_forLanguageTag checks the structrual validity. If the input BCP47
// language tag is parsed all the way to the end, it indicates that the input
// is structurally valid. Due to a couple of bugs, we can't use it
// without Chromium patches or ICU 62 or earlier.
icu::Locale icu_locale = icu::Locale::forLanguageTag(locale.c_str(), error);
if (U_FAILURE(error) || icu_locale.isBogus()) {
THROW_NEW_ERROR_RETURN_VALUE(
isolate,
NewRangeError(
MessageTemplate::kInvalidLanguageTag,
isolate->factory()->NewStringFromAsciiChecked(locale.c_str())),
Nothing<std::string>());
}
// Use LocaleBuilder to validate locale.
icu_locale = icu::LocaleBuilder().setLocale(icu_locale).build(error);
icu_locale.canonicalize(error);
if (U_FAILURE(error) || icu_locale.isBogus()) {
THROW_NEW_ERROR_RETURN_VALUE(
isolate,
NewRangeError(
MessageTemplate::kInvalidLanguageTag,
isolate->factory()->NewStringFromAsciiChecked(locale.c_str())),
Nothing<std::string>());
}
Maybe<std::string> maybe_to_language_tag = Intl::ToLanguageTag(icu_locale);
if (maybe_to_language_tag.IsNothing()) {
THROW_NEW_ERROR_RETURN_VALUE(
isolate,
NewRangeError(
MessageTemplate::kInvalidLanguageTag,
isolate->factory()->NewStringFromAsciiChecked(locale.c_str())),
Nothing<std::string>());
}
return maybe_to_language_tag;
}
Maybe<std::string> CanonicalizeLanguageTag(Isolate* isolate,
Handle<Object> locale_in) {
Handle<String> locale_str;
// This does part of the validity checking spec'ed in CanonicalizeLocaleList:
// 7c ii. If Type(kValue) is not String or Object, throw a TypeError
// exception.
// 7c iii. Let tag be ? ToString(kValue).
// 7c iv. If IsStructurallyValidLanguageTag(tag) is false, throw a
// RangeError exception.
if (IsString(*locale_in)) {
locale_str = Handle<String>::cast(locale_in);
} else if (IsJSReceiver(*locale_in)) {
ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate, locale_str,
Object::ToString(isolate, locale_in),
Nothing<std::string>());
} else {
THROW_NEW_ERROR_RETURN_VALUE(isolate,
NewTypeError(MessageTemplate::kLanguageID),
Nothing<std::string>());
}
std::string locale(locale_str->ToCString().get());
if (!IsStructurallyValidLanguageTag(locale)) {
THROW_NEW_ERROR_RETURN_VALUE(
isolate, NewRangeError(MessageTemplate::kLocaleBadParameters),
Nothing<std::string>());
}
return CanonicalizeLanguageTag(isolate, locale);
}
} // anonymous namespace
Maybe<std::vector<std::string>> Intl::CanonicalizeLocaleList(
Isolate* isolate, Handle<Object> locales, bool only_return_one_result) {
// 1. If locales is undefined, then
if (IsUndefined(*locales, isolate)) {
// 1a. Return a new empty List.
return Just(std::vector<std::string>());
}
// 2. Let seen be a new empty List.
std::vector<std::string> seen;
// 3. If Type(locales) is String or locales has an [[InitializedLocale]]
// internal slot, then
if (IsJSLocale(*locales)) {
// Since this value came from JSLocale, which is already went though the
// CanonializeLanguageTag process once, therefore there are no need to
// call CanonializeLanguageTag again.
seen.push_back(JSLocale::ToString(Handle<JSLocale>::cast(locales)));
return Just(seen);
}
if (IsString(*locales)) {
// 3a. Let O be CreateArrayFromList(« locales »).
// Instead of creating a one-element array and then iterating over it,
// we inline the body of the iteration:
std::string canonicalized_tag;
if (!CanonicalizeLanguageTag(isolate, locales).To(&canonicalized_tag)) {
return Nothing<std::vector<std::string>>();
}
seen.push_back(canonicalized_tag);
return Just(seen);
}
// 4. Else,
// 4a. Let O be ? ToObject(locales).
Handle<JSReceiver> o;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate, o,
Object::ToObject(isolate, locales),
Nothing<std::vector<std::string>>());
// 5. Let len be ? ToLength(? Get(O, "length")).
Handle<Object> length_obj;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate, length_obj,
Object::GetLengthFromArrayLike(isolate, o),
Nothing<std::vector<std::string>>());
// TODO(jkummerow): Spec violation: strictly speaking, we have to iterate
// up to 2^53-1 if {length_obj} says so. Since cases above 2^32 probably
// don't happen in practice (and would be very slow if they do), we'll keep
// the code simple for now by using a saturating to-uint32 conversion.
double raw_length = Object::Number(*length_obj);
uint32_t len =
raw_length >= kMaxUInt32 ? kMaxUInt32 : static_cast<uint32_t>(raw_length);
// 6. Let k be 0.
// 7. Repeat, while k < len
for (uint32_t k = 0; k < len; k++) {
// 7a. Let Pk be ToString(k).
// 7b. Let kPresent be ? HasProperty(O, Pk).
LookupIterator it(isolate, o, k);
Maybe<bool> maybe_found = JSReceiver::HasProperty(&it);
MAYBE_RETURN(maybe_found, Nothing<std::vector<std::string>>());
// 7c. If kPresent is true, then
if (!maybe_found.FromJust()) continue;
// 7c i. Let kValue be ? Get(O, Pk).
Handle<Object> k_value;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(isolate, k_value, Object::GetProperty(&it),
Nothing<std::vector<std::string>>());
// 7c ii. If Type(kValue) is not String or Object, throw a TypeError
// exception.
// 7c iii. If Type(kValue) is Object and kValue has an [[InitializedLocale]]
// internal slot, then
std::string canonicalized_tag;
if (IsJSLocale(*k_value)) {
// 7c iii. 1. Let tag be kValue.[[Locale]].
canonicalized_tag = JSLocale::ToString(Handle<JSLocale>::cast(k_value));
// 7c iv. Else,
} else {
// 7c iv 1. Let tag be ? ToString(kValue).
// 7c v. If IsStructurallyValidLanguageTag(tag) is false, throw a
// RangeError exception.
// 7c vi. Let canonicalizedTag be CanonicalizeLanguageTag(tag).
if (!CanonicalizeLanguageTag(isolate, k_value).To(&canonicalized_tag)) {
return Nothing<std::vector<std::string>>();
}
}
// 7c vi. If canonicalizedTag is not an element of seen, append
// canonicalizedTag as the last element of seen.
if (std::find(seen.begin(), seen.end(), canonicalized_tag) == seen.end()) {
seen.push_back(canonicalized_tag);
}
// 7d. Increase k by 1. (See loop header.)
// Optimization: some callers only need one result.
if (only_return_one_result) return Just(seen);
}
// 8. Return seen.
return Just(seen);
}
// ecma402 #sup-string.prototype.tolocalelowercase
// ecma402 #sup-string.prototype.tolocaleuppercase
MaybeHandle<String> Intl::StringLocaleConvertCase(Isolate* isolate,
Handle<String> s,
bool to_upper,
Handle<Object> locales) {
std::vector<std::string> requested_locales;
if (!CanonicalizeLocaleList(isolate, locales, true).To(&requested_locales)) {
return MaybeHandle<String>();
}
std::string requested_locale = requested_locales.size() == 0
? isolate->DefaultLocale()
: requested_locales[0];
size_t dash = requested_locale.find('-');
if (dash != std::string::npos) {
requested_locale = requested_locale.substr(0, dash);
}
// Primary language tag can be up to 8 characters long in theory.
// https://tools.ietf.org/html/bcp47#section-2.2.1
DCHECK_LE(requested_locale.length(), 8);
s = String::Flatten(isolate, s);
// All the languages requiring special-handling have two-letter codes.
// Note that we have to check for '!= 2' here because private-use language
// tags (x-foo) or grandfathered irregular tags (e.g. i-enochian) would have
// only 'x' or 'i' when they get here.
if (V8_UNLIKELY(requested_locale.length() != 2)) {
if (to_upper) {
return ConvertToUpper(isolate, s);
}
return ConvertToLower(isolate, s);
}
// TODO(jshin): Consider adding a fast path for ASCII or Latin-1. The fastpath
// in the root locale needs to be adjusted for az, lt and tr because even case
// mapping of ASCII range characters are different in those locales.
// Greek (el) does not require any adjustment.
if (V8_UNLIKELY((requested_locale == "tr") || (requested_locale == "el") ||
(requested_locale == "lt") || (requested_locale == "az"))) {
return LocaleConvertCase(isolate, s, to_upper, requested_locale.c_str());
} else {
if (to_upper) {
return ConvertToUpper(isolate, s);
}
return ConvertToLower(isolate, s);
}
}
// static
template <class IsolateT>
Intl::CompareStringsOptions Intl::CompareStringsOptionsFor(
IsolateT* isolate, Handle<Object> locales, Handle<Object> options) {
if (!IsUndefined(*options, isolate)) {
return CompareStringsOptions::kNone;
}
// Lists all of the available locales that are statically known to fulfill
// fast path conditions. See the StringLocaleCompareFastPath test as a
// starting point to update this list.
//
// Locale entries are roughly sorted s.t. common locales come first.
//
// The actual conditions are verified in debug builds in
// CollatorAllowsFastComparison.
static const char* const kFastLocales[] = {
"en-US", "en", "fr", "es", "de", "pt", "it", "ca",
"de-AT", "fi", "id", "id-ID", "ms", "nl", "pl", "ro",
"sl", "sv", "sw", "vi", "en-DE", "en-GB",
};
if (IsUndefined(*locales, isolate)) {
const std::string& default_locale = isolate->DefaultLocale();
for (const char* fast_locale : kFastLocales) {
if (strcmp(fast_locale, default_locale.c_str()) == 0) {
return CompareStringsOptions::kTryFastPath;
}
}
return CompareStringsOptions::kNone;
}
if (!IsString(*locales)) return CompareStringsOptions::kNone;
Handle<String> locales_string = Handle<String>::cast(locales);
for (const char* fast_locale : kFastLocales) {
if (locales_string->IsEqualTo(base::CStrVector(fast_locale), isolate)) {
return CompareStringsOptions::kTryFastPath;
}
}
return CompareStringsOptions::kNone;
}
// Instantiations.
template Intl::CompareStringsOptions Intl::CompareStringsOptionsFor(
Isolate*, Handle<Object>, Handle<Object>);
template Intl::CompareStringsOptions Intl::CompareStringsOptionsFor(
LocalIsolate*, Handle<Object>, Handle<Object>);
base::Optional<int> Intl::StringLocaleCompare(
Isolate* isolate, Handle<String> string1, Handle<String> string2,
Handle<Object> locales, Handle<Object> options, const char* method_name) {
// We only cache the instance when locales is a string/undefined and
// options is undefined, as that is the only case when the specified
// side-effects of examining those arguments are unobservable.
const bool can_cache =
(IsString(*locales) || IsUndefined(*locales, isolate)) &&
IsUndefined(*options, isolate);
// We may be able to take the fast path, depending on the `locales` and
// `options` arguments.
const CompareStringsOptions compare_strings_options =
CompareStringsOptionsFor(isolate, locales, options);
if (can_cache) {
// Both locales and options are undefined, check the cache.
icu::Collator* cached_icu_collator =
static_cast<icu::Collator*>(isolate->get_cached_icu_object(
Isolate::ICUObjectCacheType::kDefaultCollator, locales));
// We may use the cached icu::Collator for a fast path.
if (cached_icu_collator != nullptr) {
return Intl::CompareStrings(isolate, *cached_icu_collator, string1,
string2, compare_strings_options);
}
}
Handle<JSFunction> constructor = Handle<JSFunction>(
JSFunction::cast(
isolate->context()->native_context()->intl_collator_function()),
isolate);
Handle<JSCollator> collator;
MaybeHandle<JSCollator> maybe_collator =
New<JSCollator>(isolate, constructor, locales, options, method_name);
if (!maybe_collator.ToHandle(&collator)) return {};
if (can_cache) {
isolate->set_icu_object_in_cache(
Isolate::ICUObjectCacheType::kDefaultCollator, locales,
std::static_pointer_cast<icu::UMemory>(
collator->icu_collator()->get()));
}
icu::Collator* icu_collator = collator->icu_collator()->raw();
return Intl::CompareStrings(isolate, *icu_collator, string1, string2,
compare_strings_options);
}
namespace {
// Weights for the Unicode Collation Algorithm for charcodes [0x00,0x7F].
// https://unicode.org/reports/tr10/.
//
// Generated from:
//
// $ wget http://www.unicode.org/Public/UCA/latest/allkeys.txt
// $ cat ~/allkeys.txt | grep '^00[0-7]. ;' | sort | sed 's/[*.]/ /g' |\
// sed 's/.*\[ \(.*\)\].*/\1/' | python ~/gen_weights.py
//
// Where gen_weights.py does an ordinal rank s.t. weights fit in a uint8_t:
//
// import sys
//
// def to_ordinal(ws):
// weight_map = {}
// weights_uniq_sorted = sorted(set(ws))
// for i in range(0, len(weights_uniq_sorted)):
// weight_map[weights_uniq_sorted[i]] = i
// return [weight_map[x] for x in ws]
//
// def print_weight_list(array_name, ws):
// print("constexpr uint8_t %s[256] = {" % array_name, end = "")
// i = 0
// for w in ws:
// if (i % 16) == 0:
// print("\n ", end = "")
// print("%3d," % w, end = "")
// i += 1
// print("\n};\n")
//
// if __name__ == "__main__":
// l1s = []
// l3s = []
// for line in sys.stdin:
// weights = line.split()
// l1s.append(int(weights[0], 16))
// l3s.append(int(weights[2], 16))
// print_weight_list("kCollationWeightsL1", to_ordinal(l1s))
// print_weight_list("kCollationWeightsL3", to_ordinal(l3s))
// clang-format off
constexpr uint8_t kCollationWeightsL1[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
6, 12, 16, 28, 38, 29, 27, 15, 17, 18, 24, 32, 9, 8, 14, 25,
39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 11, 10, 33, 34, 35, 13,
23, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 19, 26, 20, 31, 7,
30, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 21, 36, 22, 37, 0,
};
constexpr uint8_t kCollationWeightsL3[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
};
constexpr int kCollationWeightsLength = arraysize(kCollationWeightsL1);
static_assert(kCollationWeightsLength == arraysize(kCollationWeightsL3));
// clang-format on
// Normalize a comparison delta (usually `lhs - rhs`) to UCollationResult
// values.
constexpr UCollationResult ToUCollationResult(int delta) {
return delta < 0 ? UCollationResult::UCOL_LESS
: (delta > 0 ? UCollationResult::UCOL_GREATER
: UCollationResult::UCOL_EQUAL);
}
struct FastCompareStringsData {
UCollationResult l1_result = UCollationResult::UCOL_EQUAL;
UCollationResult l3_result = UCollationResult::UCOL_EQUAL;
int processed_until = 0;
int first_diff_at = 0; // The first relevant diff (L1 if exists, else L3).
bool has_diff = false;
base::Optional<UCollationResult> FastCompareFailed(
int* processed_until_out) const {
if (has_diff) {
// Found some difference, continue there to ensure the generic algorithm
// picks it up.
*processed_until_out = first_diff_at;
} else {
// No difference found, reprocess the last processed character since it
// may be followed by a unicode combining character (which alters it's
// meaning).
*processed_until_out = std::max(processed_until - 1, 0);
}
return {};
}
};
template <class CharT>
constexpr bool CanFastCompare(CharT c) {
return c < kCollationWeightsLength && kCollationWeightsL1[c] != 0;
}
template <class Char1T, class Char2T>
bool FastCompareFlatString(const Char1T* lhs, const Char2T* rhs, int length,
FastCompareStringsData* d) {
for (int i = 0; i < length; i++) {
const Char1T l = lhs[i];
const Char2T r = rhs[i];
if (!CanFastCompare(l) || !CanFastCompare(r)) {
d->processed_until = i;
return false;
}
UCollationResult l1_result =
ToUCollationResult(kCollationWeightsL1[l] - kCollationWeightsL1[r]);
if (l1_result != UCollationResult::UCOL_EQUAL) {
d->has_diff = true;
d->first_diff_at = i;
d->processed_until = i;
d->l1_result = l1_result;
return true;
}
if (l != r && d->l3_result == UCollationResult::UCOL_EQUAL) {
// Collapse the two-pass algorithm into one: if we find a difference in
// L1 weights, that is our result. If not, use the first L3 weight
// difference.
UCollationResult l3_result =
ToUCollationResult(kCollationWeightsL3[l] - kCollationWeightsL3[r]);
d->l3_result = l3_result;
if (!d->has_diff) {
d->has_diff = true;
d->first_diff_at = i;
}
}
}
d->processed_until = length;
return true;
}
bool FastCompareStringFlatContent(const String::FlatContent& lhs,
const String::FlatContent& rhs, int length,
FastCompareStringsData* d) {
if (lhs.IsOneByte()) {
base::Vector<const uint8_t> l = lhs.ToOneByteVector();
if (rhs.IsOneByte()) {
base::Vector<const uint8_t> r = rhs.ToOneByteVector();
return FastCompareFlatString(l.data(), r.data(), length, d);
} else {
base::Vector<const uint16_t> r = rhs.ToUC16Vector();
return FastCompareFlatString(l.data(), r.data(), length, d);
}
} else {
base::Vector<const uint16_t> l = lhs.ToUC16Vector();
if (rhs.IsOneByte()) {
base::Vector<const uint8_t> r = rhs.ToOneByteVector();
return FastCompareFlatString(l.data(), r.data(), length, d);
} else {
base::Vector<const uint16_t> r = rhs.ToUC16Vector();
return FastCompareFlatString(l.data(), r.data(), length, d);
}
}
UNREACHABLE();
}
bool CharIsAsciiOrOutOfBounds(const String::FlatContent& string,
int string_length, int index) {
DCHECK_EQ(string.length(), string_length);
return index >= string_length || isascii(string.Get(index));
}
bool CharCanFastCompareOrOutOfBounds(const String::FlatContent& string,
int string_length, int index) {
DCHECK_EQ(string.length(), string_length);
return index >= string_length || CanFastCompare(string.Get(index));
}
#ifdef DEBUG
bool USetContainsAllAsciiItem(USet* set) {
static constexpr int kBufferSize = 64;
UChar buffer[kBufferSize];
const int length = uset_getItemCount(set);
for (int i = 0; i < length; i++) {
UChar32 start, end;
UErrorCode status = U_ZERO_ERROR;
const int item_length =
uset_getItem(set, i, &start, &end, buffer, kBufferSize, &status);
CHECK(U_SUCCESS(status));
DCHECK_GE(item_length, 0);
if (item_length == 0) {
// Empty string or a range.
if (isascii(start)) return true;
} else {
// A non-empty string.
bool all_ascii = true;
for (int j = 0; j < item_length; j++) {
if (!isascii(buffer[j])) {
all_ascii = false;
break;
}
}
if (all_ascii) return true;
}
}
return false;
}
bool CollatorAllowsFastComparison(const icu::Collator& icu_collator) {
UErrorCode status = U_ZERO_ERROR;
icu::Locale icu_locale(icu_collator.getLocale(ULOC_VALID_LOCALE, status));
DCHECK(U_SUCCESS(status));
static constexpr int kBufferSize = 64;
char buffer[kBufferSize];
const int collation_keyword_length =
icu_locale.getKeywordValue("collation", buffer, kBufferSize, status);
DCHECK(U_SUCCESS(status));
if (collation_keyword_length != 0) return false;
// These attributes must be set to the expected value for fast comparisons.
static constexpr struct {
UColAttribute attribute;
UColAttributeValue legal_value;
} kAttributeChecks[] = {
{UCOL_ALTERNATE_HANDLING, UCOL_NON_IGNORABLE},
{UCOL_CASE_FIRST, UCOL_OFF},
{UCOL_CASE_LEVEL, UCOL_OFF},
{UCOL_FRENCH_COLLATION, UCOL_OFF},
{UCOL_NUMERIC_COLLATION, UCOL_OFF},
{UCOL_STRENGTH, UCOL_TERTIARY},
};
for (const auto& check : kAttributeChecks) {
if (icu_collator.getAttribute(check.attribute, status) !=
check.legal_value) {
return false;
}
DCHECK(U_SUCCESS(status));
}
// No reordering codes are allowed.
int num_reorder_codes =
ucol_getReorderCodes(icu_collator.toUCollator(), nullptr, 0, &status);
if (num_reorder_codes != 0) return false;
DCHECK(U_SUCCESS(status)); // Must check *after* num_reorder_codes != 0.
// No tailored rules are allowed.
int32_t rules_length = 0;
ucol_getRules(icu_collator.toUCollator(), &rules_length);
if (rules_length != 0) return false;
USet* tailored_set = ucol_getTailoredSet(icu_collator.toUCollator(), &status);
DCHECK(U_SUCCESS(status));
if (USetContainsAllAsciiItem(tailored_set)) return false;
uset_close(tailored_set);
// No ASCII contractions or expansions are allowed.
USet* contractions = uset_openEmpty();
USet* expansions = uset_openEmpty();
ucol_getContractionsAndExpansions(icu_collator.toUCollator(), contractions,
expansions, true, &status);
if (USetContainsAllAsciiItem(contractions)) return false;
if (USetContainsAllAsciiItem(expansions)) return false;
DCHECK(U_SUCCESS(status));
uset_close(contractions);
uset_close(expansions);
return true;
}
#endif // DEBUG
// Fast comparison is implemented for charcodes for which the L1 collation
// weight (see kCollactionWeightsL1 above) is not 0.
//
// Note it's possible to partially process strings as long as their leading
// characters all satisfy the above criteria. In that case, and if the L3
// result is EQUAL, we set `processed_until_out` to the first non-processed
// index - future processing can begin at that offset.
//
// This fast path looks somewhat complex; mostly because it combines multiple
// passes into one. The pseudo-code for simplified multi-pass algorithm is:
//
// {
// // We can only fast-compare a certain subset of the ASCII range.
// // Additionally, unicode characters can change the meaning of preceding
// // characters, for example: "o\u0308" is treated like "ö".
// //
// // Note, in the actual single-pass algorithm below, we tolerate non-ASCII
// // contents outside the relevant range.
// for (int i = 0; i < string1.length; i++) {
// if (!CanFastCompare(string1[i])) return {};
// }
// for (int i = 0; i < string2.length; i++) {
// if (!CanFastCompare(string2[i])) return {};
// }
//
// // Apply L1 weights.
// for (int i = 0; i < common_length; i++) {
// Char1T c1 = string1[i];
// Char2T c2 = string2[i];
// if (L1Weight[c1] != L1Weight[c2]) {
// return L1Weight[c1] - L1Weight[c2];
// }
// }
//
// // Strings are L1-equal up to the common length; if lengths differ, the
// // longer string is treated as 'greater'.
// if (string1.length != string2.length) string1.length - string2.length;
//
// // Apply L3 weights.
// for (int i = 0; i < common_length; i++) {
// Char1T c1 = string1[i];
// Char2T c2 = string2[i];
// if (L3Weight[c1] != L3Weight[c2]) {
// return L3Weight[c1] - L3Weight[c2];
// }
// }
//
// return UCOL_EQUAL;
// }
base::Optional<UCollationResult> TryFastCompareStrings(
Isolate* isolate, const icu::Collator& icu_collator, Handle<String> string1,
Handle<String> string2, int* processed_until_out) {
// TODO(jgruber): We could avoid the flattening (done by the caller) as well
// by implementing comparison through string iteration. This has visible
// performance benefits (e.g. 7% on CDJS) but complicates the code. Consider
// doing this in the future.
DCHECK(string1->IsFlat());
DCHECK(string2->IsFlat());
*processed_until_out = 0;
#ifdef DEBUG
// Checked by the caller, see CompareStringsOptionsFor.
SLOW_DCHECK(CollatorAllowsFastComparison(icu_collator));
USE(CollatorAllowsFastComparison);
#endif // DEBUG
DCHECK(!SharedStringAccessGuardIfNeeded::IsNeeded(*string1));
DCHECK(!SharedStringAccessGuardIfNeeded::IsNeeded(*string2));
const int length1 = string1->length();
const int length2 = string2->length();
int common_length = std::min(length1, length2);
FastCompareStringsData d;
DisallowGarbageCollection no_gc;
const String::FlatContent& flat1 = string1->GetFlatContent(no_gc);
const String::FlatContent& flat2 = string2->GetFlatContent(no_gc);
if (!FastCompareStringFlatContent(flat1, flat2, common_length, &d)) {
DCHECK_EQ(d.l1_result, UCollationResult::UCOL_EQUAL);
return d.FastCompareFailed(processed_until_out);
}
// The result is only valid if the last processed character is not followed
// by a unicode combining character (we are overly strict and restrict to
// ASCII).
if (!CharIsAsciiOrOutOfBounds(flat1, length1, d.processed_until + 1) ||
!CharIsAsciiOrOutOfBounds(flat2, length2, d.processed_until + 1)) {
return d.FastCompareFailed(processed_until_out);
}
if (d.l1_result != UCollationResult::UCOL_EQUAL) {
return d.l1_result;
}
// Strings are L1-equal up to their common length, length differences win.
UCollationResult length_result = ToUCollationResult(length1 - length2);
if (length_result != UCollationResult::UCOL_EQUAL) {
// Strings of different lengths may still compare as equal if the longer
// string has a fully ignored suffix, e.g. "a" vs. "a\u{1}".
if (!CharCanFastCompareOrOutOfBounds(flat1, length1, common_length) ||
!CharCanFastCompareOrOutOfBounds(flat2, length2, common_length)) {
return d.FastCompareFailed(processed_until_out);
}
return length_result;
}
// L1-equal and same length, the L3 result wins.
return d.l3_result;
}
} // namespace
// static
const uint8_t* Intl::AsciiCollationWeightsL1() {
return &kCollationWeightsL1[0];
}
// static
const uint8_t* Intl::AsciiCollationWeightsL3() {
return &kCollationWeightsL3[0];
}
// static
const int Intl::kAsciiCollationWeightsLength = kCollationWeightsLength;
// ecma402/#sec-collator-comparestrings
int Intl::CompareStrings(Isolate* isolate, const icu::Collator& icu_collator,
Handle<String> string1, Handle<String> string2,
CompareStringsOptions compare_strings_options) {
// Early return for identical strings.
if (string1.is_identical_to(string2)) {
return UCollationResult::UCOL_EQUAL;
}
// We cannot return early for 0-length strings because of Unicode
// ignorable characters. See also crbug.com/1347690.
string1 = String::Flatten(isolate, string1);
string2 = String::Flatten(isolate, string2);
int processed_until = 0;
if (compare_strings_options == CompareStringsOptions::kTryFastPath) {
base::Optional<int> maybe_result = TryFastCompareStrings(
isolate, icu_collator, string1, string2, &processed_until);
if (maybe_result.has_value()) return maybe_result.value();
}
UCollationResult result;
UErrorCode status = U_ZERO_ERROR;
icu::StringPiece string_piece1 =
ToICUStringPiece(isolate, string1, processed_until);
if (!string_piece1.empty()) {
icu::StringPiece string_piece2 =
ToICUStringPiece(isolate, string2, processed_until);
if (!string_piece2.empty()) {
result = icu_collator.compareUTF8(string_piece1, string_piece2, status);
DCHECK(U_SUCCESS(status));
return result;
}
}
icu::UnicodeString string_val1 =
Intl::ToICUUnicodeString(isolate, string1, processed_until);
icu::UnicodeString string_val2 =
Intl::ToICUUnicodeString(isolate, string2, processed_until);
result = icu_collator.compare(string_val1, string_val2, status);
DCHECK(U_SUCCESS(status));
return result;
}
// ecma402/#sup-properties-of-the-number-prototype-object
MaybeHandle<String> Intl::NumberToLocaleString(Isolate* isolate,
Handle<Object> num,
Handle<Object> locales,
Handle<Object> options,
const char* method_name) {
Handle<Object> numeric_obj;
ASSIGN_RETURN_ON_EXCEPTION(isolate, numeric_obj,
Object::ToNumeric(isolate, num), String);
// We only cache the instance when locales is a string/undefined and
// options is undefined, as that is the only case when the specified
// side-effects of examining those arguments are unobservable.
bool can_cache = (IsString(*locales) || IsUndefined(*locales, isolate)) &&
IsUndefined(*options, isolate);
if (can_cache) {
icu::number::LocalizedNumberFormatter* cached_number_format =
static_cast<icu::number::LocalizedNumberFormatter*>(
isolate->get_cached_icu_object(
Isolate::ICUObjectCacheType::kDefaultNumberFormat, locales));
// We may use the cached icu::NumberFormat for a fast path.
if (cached_number_format != nullptr) {
return JSNumberFormat::FormatNumeric(isolate, *cached_number_format,
numeric_obj);
}
}
Handle<JSFunction> constructor = Handle<JSFunction>(
JSFunction::cast(
isolate->context()->native_context()->intl_number_format_function()),
isolate);
Handle<JSNumberFormat> number_format;
// 2. Let numberFormat be ? Construct(%NumberFormat%, « locales, options »).
StackLimitCheck stack_check(isolate);
// New<JSNumberFormat>() requires a lot of stack space.
const int kStackSpaceRequiredForNewJSNumberFormat = 16 * KB;
if (stack_check.JsHasOverflowed(kStackSpaceRequiredForNewJSNumberFormat)) {
isolate->StackOverflow();
return MaybeHandle<String>();
}
ASSIGN_RETURN_ON_EXCEPTION(
isolate, number_format,
New<JSNumberFormat>(isolate, constructor, locales, options, method_name),
String);
if (can_cache) {
isolate->set_icu_object_in_cache(
Isolate::ICUObjectCacheType::kDefaultNumberFormat, locales,
std::static_pointer_cast<icu::UMemory>(
number_format->icu_number_formatter()->get()));
}
// Return FormatNumber(numberFormat, x).
icu::number::LocalizedNumberFormatter* icu_number_format =
number_format->icu_number_formatter()->raw();
return JSNumberFormat::FormatNumeric(isolate, *icu_number_format,
numeric_obj);
}
namespace {
// 22. is in « 1, 2, 5, 10, 20, 25, 50, 100, 200, 250, 500, 1000, 2000, 2500,
// 5000 »
bool IsValidRoundingIncrement(int value) {
switch (value) {
case 1:
case 2:
case 5:
case 10:
case 20:
case 25:
case 50:
case 100:
case 200:
case 250:
case 500:
case 1000:
case 2000:
case 2500:
case 5000:
return true;
default:
return false;
}
}
} // namespace
Maybe<Intl::NumberFormatDigitOptions> Intl::SetNumberFormatDigitOptions(
Isolate* isolate, Handle<JSReceiver> options, int mnfd_default,
int mxfd_default, bool notation_is_compact, const char* service) {
Factory* factory = isolate->factory();
Intl::NumberFormatDigitOptions digit_options;
// 1. Let mnid be ? GetNumberOption(options, "minimumIntegerDigits,", 1, 21,
// 1).
int mnid = 1;
if (!GetNumberOption(isolate, options, factory->minimumIntegerDigits_string(),
1, 21, 1)
.To(&mnid)) {
return Nothing<NumberFormatDigitOptions>();
}
// 2. Let mnfd be ? Get(options, "minimumFractionDigits").
Handle<Object> mnfd_obj;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, mnfd_obj,
JSReceiver::GetProperty(isolate, options,
factory->minimumFractionDigits_string()),
Nothing<NumberFormatDigitOptions>());
// 3. Let mxfd be ? Get(options, "maximumFractionDigits").
Handle<Object> mxfd_obj;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, mxfd_obj,
JSReceiver::GetProperty(isolate, options,
factory->maximumFractionDigits_string()),
Nothing<NumberFormatDigitOptions>());
// 4. Let mnsd be ? Get(options, "minimumSignificantDigits").
Handle<Object> mnsd_obj;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, mnsd_obj,
JSReceiver::GetProperty(isolate, options,
factory->minimumSignificantDigits_string()),
Nothing<NumberFormatDigitOptions>());
// 5. Let mxsd be ? Get(options, "maximumSignificantDigits").
Handle<Object> mxsd_obj;
ASSIGN_RETURN_ON_EXCEPTION_VALUE(
isolate, mxsd_obj,
JSReceiver::GetProperty(isolate, options,
factory->maximumSignificantDigits_string()),
Nothing<NumberFormatDigitOptions>());
digit_options.rounding_priority = RoundingPriority::kAuto;
digit_options.minimum_significant_digits = 0;
digit_options.maximum_significant_digits = 0;
// 6. Set intlObj.[[MinimumIntegerDigits]] to mnid.
digit_options.minimum_integer_digits = mnid;
// 7. Let roundingPriority be ? GetOption(options, "roundingPriority",
// "string", « "auto", "morePrecision", "lessPrecision" », "auto").
Maybe<RoundingPriority> maybe_rounding_priority =
GetStringOption<RoundingPriority>(
isolate, options, "roundingPriority", service,
{"auto", "morePrecision", "lessPrecision"},
{RoundingPriority::kAuto, RoundingPriority::kMorePrecision,
RoundingPriority::kLessPrecision},
RoundingPriority::kAuto);
MAYBE_RETURN(maybe_rounding_priority, Nothing<NumberFormatDigitOptions>());
digit_options.rounding_priority = maybe_rounding_priority.FromJust();
// 8. Let roundingIncrement be ? GetNumberOption(options, "roundingIncrement",
// 1, 5000, 1).
Maybe<int> maybe_rounding_increment = GetNumberOption(
isolate, options, factory->roundingIncrement_string(), 1, 5000, 1);
if (!maybe_rounding_increment.To(&digit_options.rounding_increment)) {
return Nothing<NumberFormatDigitOptions>();
}
// 9. If roundingIncrement is not in « 1, 2, 5, 10, 20, 25, 50, 100, 200, 250,
// 500, 1000, 2000, 2500, 5000 », throw a RangeError exception.
if (!IsValidRoundingIncrement(digit_options.rounding_increment)) {
THROW_NEW_ERROR_RETURN_VALUE(
isolate,
NewRangeError(MessageTemplate::kPropertyValueOutOfRange,
factory->roundingIncrement_string()),
Nothing<NumberFormatDigitOptions>());
}
// 10. Let roundingMode be ? GetOption(options, "roundingMode", string, «
// "ceil", "floor", "expand", "trunc", "halfCeil", "halfFloor", "halfExpand",
// "halfTrunc", "halfEven" », "halfExpand").
Maybe<RoundingMode> maybe_rounding_mode = GetStringOption<RoundingMode>(
isolate, options, "roundingMode", service,
{"ceil", "floor", "expand", "trunc", "halfCeil", "halfFloor",
"halfExpand", "halfTrunc", "halfEven"},
{RoundingMode::kCeil, RoundingMode::kFloor, RoundingMode::kExpand,
RoundingMode::kTrunc, RoundingMode::kHalfCeil, RoundingMode::kHalfFloor,
RoundingMode::kHalfExpand, RoundingMode::kHalfTrunc,
RoundingMode::kHalfEven},
RoundingMode::kHalfExpand);
MAYBE_RETURN(maybe_rounding_mode, Nothing<NumberFormatDigitOptions>());
digit_options.rounding_mode = maybe_rounding_mode.FromJust();
// 11. Let trailingZeroDisplay be ? GetOption(options, "trailingZeroDisplay",
// string, « "auto", "stripIfInteger" », "auto").
Maybe<TrailingZeroDisplay> maybe_trailing_zero_display =
GetStringOption<TrailingZeroDisplay>(
isolate, options, "trailingZeroDisplay", service,
{"auto", "stripIfInteger"},
{TrailingZeroDisplay::kAuto, TrailingZeroDisplay::kStripIfInteger},
TrailingZeroDisplay::kAuto);
MAYBE_RETURN(maybe_trailing_zero_display,
Nothing<NumberFormatDigitOptions>());
digit_options.trailing_zero_display = maybe_trailing_zero_display.FromJust();
// 12. NOTE: All fields required by SetNumberFormatDigitOptions have now been
// read from options. The remainder of this AO interprets the options and may
// throw exceptions.
// 17. If mnsd is not undefined or mxsd is not undefined, then
// a. Set hasSd to true.
// 18. Else,
// a. Set hasSd to false.
bool has_sd =
(!IsUndefined(*mnsd_obj, isolate)) || (!IsUndefined(*mxsd_obj, isolate));
// 19. If mnfd is not undefined or mxfd is not undefined, then
// a. Set hasFd to true.
// 22. Else,
// a. Set hasFd to false.
bool has_fd =
(!IsUndefined(*mnfd_obj, isolate)) || (!IsUndefined(*mxfd_obj, isolate));
// 21. Let needSd be true.
bool need_sd = true;
// 22. Let needFd be true.
bool need_fd = true;
// 23. If roundingPriority is "auto", then
if (RoundingPriority::kAuto == digit_options.rounding_priority) {
// a. Set needSd to hasSd.
need_sd = has_sd;
// b. If needSd is true, or hasFd is false and notation is "compact", then
if (need_sd || ((!has_fd) && notation_is_compact)) {
// i. Set needFd to false.
need_fd = false;
}
}
// 24. If needSd is true, then
if (need_sd) {
// 24.a If hasSd is true, then
if (has_sd) {
// i. Set intlObj.[[MinimumSignificantDigits]] to ?
// DefaultNumberOption(mnsd, 1, 21, 1).
int mnsd;
if (!DefaultNumberOption(isolate, mnsd_obj, 1, 21, 1,
factory->minimumSignificantDigits_string())
.To(&mnsd)) {
return Nothing<NumberFormatDigitOptions>();
}
digit_options.minimum_significant_digits = mnsd;
// ii. Set intlObj.[[MaximumSignificantDigits]] to ?
// DefaultNumberOption(mxsd, intlObj.[[MinimumSignificantDigits]], 21,
// 21).
int mxsd;
if (!DefaultNumberOption(isolate, mxsd_obj, mnsd, 21, 21,
factory->maximumSignificantDigits_string())
.To(&mxsd)) {
return Nothing<NumberFormatDigitOptions>();
}
digit_options.maximum_significant_digits = mxsd;
} else {
// 24.b Else
// 24.b.i Set intlObj.[[MinimumSignificantDigits]] to 1.
digit_options.minimum_significant_digits = 1;
// 24.b.ii Set intlObj.[[MaximumSignificantDigits]] to 21.
digit_options.maximum_significant_digits = 21;
}
}
Handle<String> mxfd_str = factory->maximumFractionDigits_string();
// 25. If needFd is true, then
if (need_fd) {
// a. If hasFd is true, then
if (has_fd) {
Handle<String> mnfd_str = factory->minimumFractionDigits_string();
// i. Let mnfd be ? DefaultNumberOption(mnfd, 0, 100, undefined).
int mnfd;
if (!DefaultNumberOption(isolate, mnfd_obj, 0, 100, -1, mnfd_str)
.To(&mnfd)) {
return Nothing<NumberFormatDigitOptions>();
}
// ii. Let mxfd be ? DefaultNumberOption(mxfd, 0, 100, undefined).
int mxfd;
if (!DefaultNumberOption(isolate, mxfd_obj, 0, 100, -1, mxfd_str)
.To(&mxfd)) {
return Nothing<NumberFormatDigitOptions>();
}
// iii. If mnfd is undefined, set mnfd to min(mnfdDefault, mxfd).
if (IsUndefined(*mnfd_obj, isolate)) {
mnfd = std::min(mnfd_default, mxfd);
} else if (IsUndefined(*mxfd_obj, isolate)) {
// iv. Else if mxfd is undefined, set mxfd to max(mxfdDefault,
// mnfd).
mxfd = std::max(mxfd_default, mnfd);
} else if (mnfd > mxfd) {
// v. Else if mnfd is greater than mxfd, throw a RangeError
// exception.
THROW_NEW_ERROR_RETURN_VALUE(
isolate,
NewRangeError(MessageTemplate::kPropertyValueOutOfRange, mxfd_str),
Nothing<NumberFormatDigitOptions>());
}
// vi. Set intlObj.[[MinimumFractionDigits]] to mnfd.
digit_options.minimum_fraction_digits = mnfd;
// vii. Set intlObj.[[MaximumFractionDigits]] to mxfd.
digit_options.maximum_fraction_digits = mxfd;
} else { // b. Else
// i. Set intlObj.[[MinimumFractionDigits]] to mnfdDefault.
digit_options.minimum_fraction_digits = mnfd_default;
// ii. Set intlObj.[[MaximumFractionDigits]] to mxfdDefault.
digit_options.maximum_fraction_digits = mxfd_default;
}
}
// 26. If needSd is false and needFd is false, then
if ((!need_sd) && (!need_fd)) {
// a. Set intlObj.[[MinimumFractionDigits]] to 0.
digit_options.minimum_fraction_digits = 0;
// b. Set intlObj.[[MaximumFractionDigits]] to 0.
digit_options.maximum_fraction_digits = 0;
// c. Set intlObj.[[MinimumSignificantDigits]] to 1.
digit_options.minimum_significant_digits = 1;
// d. Set intlObj.[[MaximumSignificantDigits]] to 2.
digit_options.maximum_significant_digits = 2;
// e. Set intlObj.[[RoundingType]] to morePrecision.
digit_options.rounding_type = RoundingType::kMorePrecision;
// 27. Else if roundingPriority is "morePrecision", then
} else if (digit_options.rounding_priority ==
RoundingPriority::kMorePrecision) {
// i. Set intlObj.[[RoundingType]] to morePrecision.
digit_options.rounding_type = RoundingType::kMorePrecision;
// 28. Else if roundingPriority is "lessPrecision", then
} else if (digit_options.rounding_priority ==
RoundingPriority::kLessPrecision) {
// i. Set intlObj.[[RoundingType]] to lessPrecision.
digit_options.rounding_type = RoundingType::kLessPrecision;
// 29. Else if hasSd, then
} else if (has_sd) {
// i. Set intlObj.[[RoundingType]] to significantDigits.
digit_options.rounding_type = RoundingType::kSignificantDigits;
// 30. Else,
} else {
// i.Set intlObj.[[RoundingType]] to fractionDigits.
digit_options.rounding_type = RoundingType::kFractionDigits;
}
// 31. If roundingIncrement is not 1, then
if (digit_options.rounding_increment != 1) {
// a. If intlObj.[[RoundingType]] is not fractionDigits, throw a TypeError
// exception.
if (digit_options.rounding_type != RoundingType::kFractionDigits) {
THROW_NEW_ERROR_RETURN_VALUE(
isolate, NewTypeError(MessageTemplate::kBadRoundingType),
Nothing<NumberFormatDigitOptions>());
}
// b. If intlObj.[[MaximumFractionDigits]] is not equal to
// intlObj.[[MinimumFractionDigits]], throw a RangeError exception.
if (digit_options.maximum_fraction_digits !=
digit_options.minimum_fraction_digits) {
THROW_NEW_ERROR_RETURN_VALUE(
isolate,
NewRangeError(MessageTemplate::kPropertyValueOutOfRange, mxfd_str),
Nothing<NumberFormatDigitOptions>());
}
}
return Just(digit_options);
}
namespace {
// ecma402/#sec-bestavailablelocale
std::string BestAvailableLocale(const std::set<std::string>& available_locales,
const std::string& locale) {
// 1. Let candidate be locale.
std::string candidate = locale;
// 2. Repeat,
while (true) {
// 2.a. If availableLocales contains an element equal to candidate, return
// candidate.
if (available_locales.find(candidate) != available_locales.end()) {
return candidate;
}
// 2.b. Let pos be the character index of the last occurrence of "-"
// (U+002D) within candidate. If that character does not occur, return
// undefined.
size_t pos = candidate.rfind('-');
if (pos == std::string::npos) {
return std::string();
}
// 2.c. If pos ≥ 2 and the character "-" occurs at index pos-2 of candidate,
// decrease pos by 2.
if (pos >= 2 && candidate[pos - 2] == '-') {
pos -= 2;
}
// 2.d. Let candidate be the substring of candidate from position 0,
// inclusive, to position pos, exclusive.
candidate = candidate.substr(0, pos);
}
}
struct ParsedLocale {
std::string no_extensions_locale;
std::string extension;
};
// Returns a struct containing a bcp47 tag without unicode extensions
// and the removed unicode extensions.
//
// For example, given 'en-US-u-co-emoji' returns 'en-US' and
// 'u-co-emoji'.
ParsedLocale ParseBCP47Locale(const std::string& locale) {
size_t length = locale.length();
ParsedLocale parsed_locale;
// Privateuse or grandfathered locales have no extension sequences.
if ((length > 1) && (locale[1] == '-')) {
// Check to make sure that this really is a grandfathered or
// privateuse extension. ICU can sometimes mess up the
// canonicalization.
DCHECK(locale[0] == 'x' || locale[0] == 'i');
parsed_locale.no_extensions_locale = locale;
return parsed_locale;
}
size_t unicode_extension_start = locale.find("-u-");
// No unicode extensions found.
if (unicode_extension_start == std::string::npos) {
parsed_locale.no_extensions_locale = locale;
return parsed_locale;
}
size_t private_extension_start = locale.find("-x-");
// Unicode extensions found within privateuse subtags don't count.
if (private_extension_start != std::string::npos &&
private_extension_start < unicode_extension_start) {
parsed_locale.no_extensions_locale = locale;
return parsed_locale;
}
const std::string beginning = locale.substr(0, unicode_extension_start);
size_t unicode_extension_end = length;
DCHECK_GT(length, 2);
// Find the end of the extension production as per the bcp47 grammar
// by looking for '-' followed by 2 chars and then another '-'.
for (size_t i = unicode_extension_start + 1; i < length - 2; i++) {
if (locale[i] != '-') continue;
if (locale[i + 2] == '-') {
unicode_extension_end = i;
break;
}
i += 2;
}
const std::string end = locale.substr(unicode_extension_end);
parsed_locale.no_extensions_locale = beginning + end;
parsed_locale.extension = locale.substr(
unicode_extension_start, unicode_extension_end - unicode_extension_start);
return parsed_locale;
}
// ecma402/#sec-lookupsupportedlocales
std::vector<std::string> LookupSupportedLocales(
const std::set<std::string>& available_locales,
const std::vector<std::string>& requested_locales) {
// 1. Let subset be a new empty List.
std::vector<std::string> subset;
// 2. For each element locale of requestedLocales in List order, do
for (const std::string& locale : requested_locales) {
// 2. a. Let noExtensionsLocale be the String value that is locale
// with all Unicode locale extension sequences removed.
std::string no_extension_locale =
ParseBCP47Locale(locale).no_extensions_locale;
// 2. b. Let availableLocale be
// BestAvailableLocale(availableLocales, noExtensionsLocale).
std::string available_locale =
BestAvailableLocale(available_locales, no_extension_locale);
// 2. c. If availableLocale is not undefined, append locale to the
// end of subset.
if (!available_locale.empty()) {
subset.push_back(locale);
}
}
// 3. Return subset.
return subset;
}
icu::LocaleMatcher BuildLocaleMatcher(
Isolate* isolate, const std::set<std::string>& available_locales,
UErrorCode* status) {
icu::Locale default_locale =
icu::Locale::forLanguageTag(isolate->DefaultLocale(), *status);
icu::LocaleMatcher::Builder builder;
if (U_FAILURE(*status)) {
return builder.build(*status);
}
builder.setDefaultLocale(&default_locale);
for (auto it = available_locales.begin(); it != available_locales.end();
++it) {
*status = U_ZERO_ERROR;
icu::Locale l = icu::Locale::forLanguageTag(it->c_str(), *status);
// skip invalid locale such as no-NO-NY
if (U_SUCCESS(*status)) {
builder.addSupportedLocale(l);
}
}
return builder.build(*status);
}
class Iterator : public icu::Locale::Iterator {
public:
Iterator(std::vector<std::string>::const_iterator begin,
std::vector<std::string>::const_iterator end)
: iter_(begin), end_(end) {}
~Iterator() override = default;
UBool hasNext() const override { return iter_ != end_; }
const icu::Locale& next() override {
UErrorCode status = U_ZERO_ERROR;
locale_ = icu::Locale::forLanguageTag(iter_->c_str(), status);
DCHECK(U_SUCCESS(status));
++iter_;
return locale_;
}
private:
std::vector<std::string>::const_iterator iter_;
std::vector<std::string>::const_iterator end_;
icu::Locale locale_;
};
// ecma402/#sec-bestfitmatcher
// The BestFitMatcher abstract operation compares requestedLocales, which must
// be a List as returned by CanonicalizeLocaleList, against the locales in
// availableLocales and determines the best available language to meet the
// request. The algorithm is implementation dependent, but should produce
// results that a typical user of the requested locales would perceive
// as at least as good as those produced by the LookupMatcher abstract
// operation. Options specified through Unicode locale extension sequences must
// be ignored by the algorithm. Information about such subsequences is returned
// separately. The abstract operation returns a record with a [[locale]] field,
// whose value is the language tag of the selected locale, which must be an
// element of availableLocales. If the language tag of the request locale that
// led to the selected locale contained a Unicode locale extension sequence,
// then the returned record also contains an [[extension]] field whose value is
// the first Unicode locale extension sequence within the request locale
// language tag.
std::string BestFitMatcher(Isolate* isolate,
const std::set<std::string>& available_locales,
const std::vector<std::string>& requested_locales) {
UErrorCode status = U_ZERO_ERROR;
Iterator iter(requested_locales.cbegin(), requested_locales.cend());
std::string bestfit = BuildLocaleMatcher(isolate, available_locales, &status)
.getBestMatchResult(iter, status)
.makeResolvedLocale(status)
.toLanguageTag<std::string>(status);
DCHECK(U_SUCCESS(status));
return bestfit;
}
// ECMA 402 9.2.8 BestFitSupportedLocales(availableLocales, requestedLocales)
// https://tc39.github.io/ecma402/#sec-bestfitsupportedlocales
std::vector<std::string> BestFitSupportedLocales(
Isolate* isolate, const std::set<std::string>& available_locales,
const std::vector<std::string>& requested_locales) {
UErrorCode status = U_ZERO_ERROR;
icu::LocaleMatcher matcher =
BuildLocaleMatcher(isolate, available_locales, &status);
std::vector<std::string> result;
if (U_SUCCESS(status)) {
for (auto it = requested_locales.cbegin(); it != requested_locales.cend();
it++) {
status = U_ZERO_ERROR;
icu::Locale desired = icu::Locale::forLanguageTag(it->c_str(), status);
icu::LocaleMatcher::Result matched =
matcher.getBestMatchResult(desired, status);
if (U_FAILURE(status)) continue;
if (matched.getSupportedIndex() < 0) continue;
// The BestFitSupportedLocales abstract operation returns the *SUBSET* of
// the provided BCP 47 language priority list requestedLocales for which
// availableLocales has a matching locale when using the Best Fit Matcher
// algorithm. Locales appear in the same order in the returned list as in
// requestedLocales. The steps taken are implementation dependent.
std::string bestfit = desired.toLanguageTag<std::string>(status);
if (U_FAILURE(status)) continue;
result.push_back(bestfit);
}
}
return result;
}
// ecma262 #sec-createarrayfromlist
MaybeHandle<JSArray> CreateArrayFromList(Isolate* isolate,
std::vector<std::string> elements,
PropertyAttributes attr) {
Factory* factory = isolate->factory();
// Let array be ! ArrayCreate(0).
Handle<JSArray> array = factory->NewJSArray(0);
uint32_t length = static_cast<uint32_t>(elements.size());
// 3. Let n be 0.
// 4. For each element e of elements, do
for (uint32_t i = 0; i < length; i++) {
// a. Let status be CreateDataProperty(array, ! ToString(n), e).
const std::string& part = elements[i];
Handle<String> value =
factory->NewStringFromUtf8(base::CStrVector(part.c_str()))
.ToHandleChecked();
MAYBE_RETURN(JSObject::AddDataElement(array, i, value, attr),
MaybeHandle<JSArray>());
}
// 5. Return array.
return MaybeHandle<JSArray>(array);
}
// ECMA 402 9.2.9 SupportedLocales(availableLocales, requestedLocales, options)
// https://tc39.github.io/ecma402/#sec-supportedlocales
MaybeHandle<JSObject> SupportedLocales(
Isolate* isolate, const char* method_name,
const std::set<std::string>& available_locales,
const std::vector<std::string>& requested_locales, Handle<Object> options) {
std::vector<std::string> supported_locales;
// 1. Set options to ? CoerceOptionsToObject(options).
Handle<JSReceiver> options_obj;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, options_obj,
CoerceOptionsToObject(isolate, options, method_name), JSObject);
// 2. Let matcher be ? GetOption(options, "localeMatcher", "string",
// « "lookup", "best fit" », "best fit").
Maybe<Intl::MatcherOption> maybe_locale_matcher =
Intl::GetLocaleMatcher(isolate, options_obj, method_name);
MAYBE_RETURN(maybe_locale_matcher, MaybeHandle<JSObject>());
Intl::MatcherOption matcher = maybe_locale_matcher.FromJust();
// 3. If matcher is "best fit", then
// a. Let supportedLocales be BestFitSupportedLocales(availableLocales,
// requestedLocales).
if (matcher == Intl::MatcherOption::kBestFit &&
v8_flags.harmony_intl_best_fit_matcher) {
supported_locales =
BestFitSupportedLocales(isolate, available_locales, requested_locales);
} else {
// 4. Else,
// a. Let supportedLocales be LookupSupportedLocales(availableLocales,
// requestedLocales).
supported_locales =
LookupSupportedLocales(available_locales, requested_locales);
}
// 5. Return CreateArrayFromList(supportedLocales).
return CreateArrayFromList(isolate, supported_locales,
PropertyAttributes::NONE);
}
} // namespace
// ecma-402 #sec-intl.getcanonicallocales
MaybeHandle<JSArray> Intl::GetCanonicalLocales(Isolate* isolate,
Handle<Object> locales) {
// 1. Let ll be ? CanonicalizeLocaleList(locales).
Maybe<std::vector<std::string>> maybe_ll =
CanonicalizeLocaleList(isolate, locales, false);
MAYBE_RETURN(maybe_ll, MaybeHandle<JSArray>());
// 2. Return CreateArrayFromList(ll).
return CreateArrayFromList(isolate, maybe_ll.FromJust(),
PropertyAttributes::NONE);
}
namespace {
MaybeHandle<JSArray> AvailableCollations(Isolate* isolate) {
UErrorCode status = U_ZERO_ERROR;
std::unique_ptr<icu::StringEnumeration> enumeration(
icu::Collator::getKeywordValues("collation", status));
if (U_FAILURE(status)) {
THROW_NEW_ERROR(isolate, NewRangeError(MessageTemplate::kIcuError),
JSArray);
}
return Intl::ToJSArray(isolate, "co", enumeration.get(),
Intl::RemoveCollation, true);
}
MaybeHandle<JSArray> VectorToJSArray(Isolate* isolate,
const std::vector<std::string>& array) {
Factory* factory = isolate->factory();
Handle<FixedArray> fixed_array =
factory->NewFixedArray(static_cast<int32_t>(array.size()));
int32_t index = 0;
for (std::string item : array) {
Handle<String> str = factory->NewStringFromAsciiChecked(item.c_str());
fixed_array->set(index++, *str);
}
return factory->NewJSArrayWithElements(fixed_array);
}
namespace {
class ResourceAvailableCurrencies {
public:
ResourceAvailableCurrencies() {
UErrorCode status = U_ZERO_ERROR;
UEnumeration* uenum =
ucurr_openISOCurrencies(UCURR_COMMON | UCURR_NON_DEPRECATED, &status);
DCHECK(U_SUCCESS(status));
const char* next = nullptr;
while (U_SUCCESS(status) &&
(next = uenum_next(uenum, nullptr, &status)) != nullptr) {
// Work around the issue that we do not support VEF currency code
// in DisplayNames by not reporting it.
if (strcmp(next, "VEF") == 0) continue;
AddIfAvailable(next);
}
// Work around the issue that we do support the following currency codes
// in DisplayNames but the ICU API is not reporting it.
AddIfAvailable("SVC");
AddIfAvailable("XDR");
AddIfAvailable("XSU");
AddIfAvailable("ZWL");
std::sort(list_.begin(), list_.end());
uenum_close(uenum);
}
const std::vector<std::string>& Get() const { return list_; }
void AddIfAvailable(const char* currency) {
icu::UnicodeString code(currency, -1, US_INV);
UErrorCode status = U_ZERO_ERROR;
int32_t len = 0;
const UChar* result =
ucurr_getName(code.getTerminatedBuffer(), "en", UCURR_LONG_NAME,
nullptr, &len, &status);
if (U_SUCCESS(status) &&
u_strcmp(result, code.getTerminatedBuffer()) != 0) {
list_.push_back(currency);
}
}
private:
std::vector<std::string> list_;
};
const std::vector<std::string>& GetAvailableCurrencies() {
static base::LazyInstance<ResourceAvailableCurrencies>::type
available_currencies = LAZY_INSTANCE_INITIALIZER;
return available_currencies.Pointer()->Get();
}
} // namespace
MaybeHandle<JSArray> AvailableCurrencies(Isolate* isolate) {
return VectorToJSArray(isolate, GetAvailableCurrencies());
}
MaybeHandle<JSArray> AvailableNumberingSystems(Isolate* isolate) {
UErrorCode status = U_ZERO_ERROR;
std::unique_ptr<icu::StringEnumeration> enumeration(
icu::NumberingSystem::getAvailableNames(status));
if (U_FAILURE(status)) {
THROW_NEW_ERROR(isolate, NewRangeError(MessageTemplate::kIcuError),
JSArray);
}
// Need to filter out isAlgorithmic
return Intl::ToJSArray(
isolate, "nu", enumeration.get(),
[](const char* value) {
UErrorCode status = U_ZERO_ERROR;
std::unique_ptr<icu::NumberingSystem> numbering_system(
icu::NumberingSystem::createInstanceByName(value, status));
// Skip algorithmic one since chrome filter out the resource.
return U_FAILURE(status) || numbering_system->isAlgorithmic();
},
true);
}
MaybeHandle<JSArray> AvailableTimeZones(Isolate* isolate) {
UErrorCode status = U_ZERO_ERROR;
std::unique_ptr<icu::StringEnumeration> enumeration(
icu::TimeZone::createTimeZoneIDEnumeration(
UCAL_ZONE_TYPE_CANONICAL_LOCATION, nullptr, nullptr, status));
if (U_FAILURE(status)) {
THROW_NEW_ERROR(isolate, NewRangeError(MessageTemplate::kIcuError),
JSArray);
}
return Intl::ToJSArray(isolate, nullptr, enumeration.get(), nullptr, true);
}
MaybeHandle<JSArray> AvailableUnits(Isolate* isolate) {
Factory* factory = isolate->factory();
std::set<std::string> sanctioned(Intl::SanctionedSimpleUnits());
Handle<FixedArray> fixed_array =
factory->NewFixedArray(static_cast<int32_t>(sanctioned.size()));
int32_t index = 0;
for (std::string item : sanctioned) {
Handle<String> str = factory->NewStringFromAsciiChecked(item.c_str());
fixed_array->set(index++, *str);
}
return factory->NewJSArrayWithElements(fixed_array);
}
} // namespace
// ecma-402 #sec-intl.supportedvaluesof
MaybeHandle<JSArray> Intl::SupportedValuesOf(Isolate* isolate,
Handle<Object> key_obj) {
Factory* factory = isolate->factory();
// 1. 1. Let key be ? ToString(key).
Handle<String> key_str;
ASSIGN_RETURN_ON_EXCEPTION(isolate, key_str,
Object::ToString(isolate, key_obj), JSArray);
// 2. If key is "calendar", then
if (factory->calendar_string()->Equals(*key_str)) {
// a. Let list be ! AvailableCalendars( ).
return Intl::AvailableCalendars(isolate);
}
// 3. Else if key is "collation", then
if (factory->collation_string()->Equals(*key_str)) {
// a. Let list be ! AvailableCollations( ).
return AvailableCollations(isolate);
}
// 4. Else if key is "currency", then
if (factory->currency_string()->Equals(*key_str)) {
// a. Let list be ! AvailableCurrencies( ).
return AvailableCurrencies(isolate);
}
// 5. Else if key is "numberingSystem", then
if (factory->numberingSystem_string()->Equals(*key_str)) {
// a. Let list be ! AvailableNumberingSystems( ).
return AvailableNumberingSystems(isolate);
}
// 6. Else if key is "timeZone", then
if (factory->timeZone_string()->Equals(*key_str)) {
// a. Let list be ! AvailableTimeZones( ).
return AvailableTimeZones(isolate);
}
// 7. Else if key is "unit", then
if (factory->unit_string()->Equals(*key_str)) {
// a. Let list be ! AvailableUnits( ).
return AvailableUnits(isolate);
}
// 8. Else,
// a. Throw a RangeError exception.
// 9. Return ! CreateArrayFromList( list ).
THROW_NEW_ERROR(
isolate,
NewRangeError(MessageTemplate::kInvalid,
factory->NewStringFromStaticChars("key"), key_str),
JSArray);
}
// ECMA 402 Intl.*.supportedLocalesOf
MaybeHandle<JSObject> Intl::SupportedLocalesOf(
Isolate* isolate, const char* method_name,
const std::set<std::string>& available_locales, Handle<Object> locales,
Handle<Object> options) {
// Let availableLocales be %Collator%.[[AvailableLocales]].
// Let requestedLocales be ? CanonicalizeLocaleList(locales).
Maybe<std::vector<std::string>> requested_locales =
CanonicalizeLocaleList(isolate, locales, false);
MAYBE_RETURN(requested_locales, MaybeHandle<JSObject>());
// Return ? SupportedLocales(availableLocales, requestedLocales, options).
return SupportedLocales(isolate, method_name, available_locales,
requested_locales.FromJust(), options);
}
namespace {
template <typename T>
bool IsValidExtension(const icu::Locale& locale, const char* key,
const std::string& value) {
const char* legacy_type = uloc_toLegacyType(key, value.c_str());
if (legacy_type == nullptr) {
return false;
}
UErrorCode status = U_ZERO_ERROR;
std::unique_ptr<icu::StringEnumeration> enumeration(
T::getKeywordValuesForLocale(key, icu::Locale(locale.getBaseName()),
false, status));
if (U_FAILURE(status)) {
return false;
}
int32_t length;
for (const char* item = enumeration->next(&length, status);
U_SUCCESS(status) && item != nullptr;
item = enumeration->next(&length, status)) {
if (strcmp(legacy_type, item) == 0) {
return true;
}
}
return false;
}
} // namespace
bool Intl::IsValidCollation(const icu::Locale& locale,
const std::string& value) {
std::set<std::string> invalid_values = {"standard", "search"};
if (invalid_values.find(value) != invalid_values.end()) return false;
return IsValidExtension<icu::Collator>(locale, "collation", value);
}
bool Intl::IsWellFormedCalendar(const std::string& value) {
return JSLocale::Is38AlphaNumList(value);
}
// ecma402/#sec-iswellformedcurrencycode
bool Intl::IsWellFormedCurrency(const std::string& currency) {
return JSLocale::Is3Alpha(currency);
}
bool Intl::IsValidCalendar(const icu::Locale& locale,
const std::string& value) {
return IsValidExtension<icu::Calendar>(locale, "calendar", value);
}
bool Intl::IsValidNumberingSystem(const std::string& value) {
std::set<std::string> invalid_values = {"native", "traditio", "finance"};
if (invalid_values.find(value) != invalid_values.end()) return false;
UErrorCode status = U_ZERO_ERROR;
std::unique_ptr<icu::NumberingSystem> numbering_system(
icu::NumberingSystem::createInstanceByName(value.c_str(), status));
return U_SUCCESS(status) && numbering_system.get() != nullptr &&
!numbering_system->isAlgorithmic();
}
namespace {
bool IsWellFormedNumberingSystem(const std::string& value) {
return JSLocale::Is38AlphaNumList(value);
}
std::map<std::string, std::string> LookupAndValidateUnicodeExtensions(
icu::Locale* icu_locale, const std::set<std::string>& relevant_keys) {
std::map<std::string, std::string> extensions;
UErrorCode status = U_ZERO_ERROR;
icu::LocaleBuilder builder;
builder.setLocale(*icu_locale).clearExtensions();
std::unique_ptr<icu::StringEnumeration> keywords(
icu_locale->createKeywords(status));
if (U_FAILURE(status)) return extensions;
if (!keywords) return extensions;
char value[ULOC_FULLNAME_CAPACITY];
int32_t length;
status = U_ZERO_ERROR;
for (const char* keyword = keywords->next(&length, status);
keyword != nullptr; keyword = keywords->next(&length, status)) {
// Ignore failures in ICU and skip to the next keyword.
//
// This is fine.™
if (U_FAILURE(status)) {
status = U_ZERO_ERROR;
continue;
}
icu_locale->getKeywordValue(keyword, value, ULOC_FULLNAME_CAPACITY, status);
// Ignore failures in ICU and skip to the next keyword.
//
// This is fine.™
if (U_FAILURE(status)) {
status = U_ZERO_ERROR;
continue;
}
const char* bcp47_key = uloc_toUnicodeLocaleKey(keyword);
if (bcp47_key && (relevant_keys.find(bcp47_key) != relevant_keys.end())) {
const char* bcp47_value = uloc_toUnicodeLocaleType(bcp47_key, value);
bool is_valid_value = false;
// 8.h.ii.1.a If keyLocaleData contains requestedValue, then
if (strcmp("ca", bcp47_key) == 0) {
is_valid_value = Intl::IsValidCalendar(*icu_locale, bcp47_value);
} else if (strcmp("co", bcp47_key) == 0) {
is_valid_value = Intl::IsValidCollation(*icu_locale, bcp47_value);
} else if (strcmp("hc", bcp47_key) == 0) {
// https://www.unicode.org/repos/cldr/tags/latest/common/bcp47/calendar.xml
std::set<std::string> valid_values = {"h11", "h12", "h23", "h24"};
is_valid_value = valid_values.find(bcp47_value) != valid_values.end();
} else if (strcmp("lb", bcp47_key) == 0) {
// https://www.unicode.org/repos/cldr/tags/latest/common/bcp47/segmentation.xml
std::set<std::string> valid_values = {"strict", "normal", "loose"};
is_valid_value = valid_values.find(bcp47_value) != valid_values.end();
} else if (strcmp("kn", bcp47_key) == 0) {
// https://www.unicode.org/repos/cldr/tags/latest/common/bcp47/collation.xml
std::set<std::string> valid_values = {"true", "false"};
is_valid_value = valid_values.find(bcp47_value) != valid_values.end();
} else if (strcmp("kf", bcp47_key) == 0) {
// https://www.unicode.org/repos/cldr/tags/latest/common/bcp47/collation.xml
std::set<std::string> valid_values = {"upper", "lower", "false"};
is_valid_value = valid_values.find(bcp47_value) != valid_values.end();
} else if (strcmp("nu", bcp47_key) == 0) {
is_valid_value = Intl::IsValidNumberingSystem(bcp47_value);
}
if (is_valid_value) {
extensions.insert(
std::pair<std::string, std::string>(bcp47_key, bcp47_value));
builder.setUnicodeLocaleKeyword(bcp47_key, bcp47_value);
}
}
}
status = U_ZERO_ERROR;
*icu_locale = builder.build(status);
return extensions;
}
// ecma402/#sec-lookupmatcher
std::string LookupMatcher(Isolate* isolate,
const std::set<std::string>& available_locales,
const std::vector<std::string>& requested_locales) {
// 1. Let result be a new Record.
std::string result;
// 2. For each element locale of requestedLocales in List order, do
for (const std::string& locale : requested_locales) {
// 2. a. Let noExtensionsLocale be the String value that is locale
// with all Unicode locale extension sequences removed.
ParsedLocale parsed_locale = ParseBCP47Locale(locale);
std::string no_extensions_locale = parsed_locale.no_extensions_locale;
// 2. b. Let availableLocale be
// BestAvailableLocale(availableLocales, noExtensionsLocale).
std::string available_locale =
BestAvailableLocale(available_locales, no_extensions_locale);
// 2. c. If availableLocale is not undefined, append locale to the
// end of subset.
if (!available_locale.empty()) {
// Note: The following steps are not performed here because we
// can use ICU to parse the unicode locale extension sequence
// as part of Intl::ResolveLocale.
//
// There's no need to separate the unicode locale extensions
// right here. Instead just return the available locale with the
// extensions.
//
// 2. c. i. Set result.[[locale]] to availableLocale.
// 2. c. ii. If locale and noExtensionsLocale are not the same
// String value, then
// 2. c. ii. 1. Let extension be the String value consisting of
// the first substring of locale that is a Unicode locale
// extension sequence.
// 2. c. ii. 2. Set result.[[extension]] to extension.
// 2. c. iii. Return result.
return available_locale + parsed_locale.extension;
}
}
// 3. Let defLocale be DefaultLocale();
// 4. Set result.[[locale]] to defLocale.
// 5. Return result.
return isolate->DefaultLocale();
}
} // namespace
// This function doesn't correspond exactly with the spec. Instead
// we use ICU to do all the string manipulations that the spec
// peforms.
//
// The spec uses this function to normalize values for various
// relevant extension keys (such as disallowing "search" for
// collation). Instead of doing this here, we let the callers of
// this method perform such normalization.
//
// ecma402/#sec-resolvelocale
Maybe<Intl::ResolvedLocale> Intl::ResolveLocale(
Isolate* isolate, const std::set<std::string>& available_locales,
const std::vector<std::string>& requested_locales, MatcherOption matcher,
const std::set<std::string>& relevant_extension_keys) {
std::string locale;
if (matcher == Intl::MatcherOption::kBestFit &&
v8_flags.harmony_intl_best_fit_matcher) {
locale = BestFitMatcher(isolate, available_locales, requested_locales);
} else {
locale = LookupMatcher(isolate, available_locales, requested_locales);
}
Maybe<icu::Locale> maybe_icu_locale = CreateICULocale(locale);
MAYBE_RETURN(maybe_icu_locale, Nothing<Intl::ResolvedLocale>());
icu::Locale icu_locale = maybe_icu_locale.FromJust();
std::map<std::string, std::string> extensions =
LookupAndValidateUnicodeExtensions(&icu_locale, relevant_extension_keys);
std::string canonicalized_locale = Intl::ToLanguageTag(icu_locale).FromJust();
// TODO(gsathya): Remove privateuse subtags from extensions.
return Just(
Intl::ResolvedLocale{canonicalized_locale, icu_locale, extensions});
}
Handle<Managed<icu::UnicodeString>> Intl::SetTextToBreakIterator(
Isolate* isolate, Handle<String> text, icu::BreakIterator* break_iterator) {
text = String::Flatten(isolate, text);
icu::UnicodeString* u_text = static_cast<icu::UnicodeString*>(
Intl::ToICUUnicodeString(isolate, text).clone());
Handle<Managed<icu::UnicodeString>> new_u_text =
Managed<icu::UnicodeString>::FromRawPtr(isolate, 0, u_text);
break_iterator->setText(*u_text);
return new_u_text;
}
// ecma262 #sec-string.prototype.normalize
MaybeHandle<String> Intl::Normalize(Isolate* isolate, Handle<String> string,
Handle<Object> form_input) {
const char* form_name;
UNormalization2Mode form_mode;
if (IsUndefined(*form_input, isolate)) {
// default is FNC
form_name = "nfc";
form_mode = UNORM2_COMPOSE;
} else {
Handle<String> form;
ASSIGN_RETURN_ON_EXCEPTION(isolate, form,
Object::ToString(isolate, form_input), String);
if (String::Equals(isolate, form, isolate->factory()->NFC_string())) {
form_name = "nfc";
form_mode = UNORM2_COMPOSE;
} else if (String::Equals(isolate, form,
isolate->factory()->NFD_string())) {
form_name = "nfc";
form_mode = UNORM2_DECOMPOSE;
} else if (String::Equals(isolate, form,
isolate->factory()->NFKC_string())) {
form_name = "nfkc";
form_mode = UNORM2_COMPOSE;
} else if (String::Equals(isolate, form,
isolate->factory()->NFKD_string())) {
form_name = "nfkc";
form_mode = UNORM2_DECOMPOSE;
} else {
Handle<String> valid_forms =
isolate->factory()->NewStringFromStaticChars("NFC, NFD, NFKC, NFKD");
THROW_NEW_ERROR(
isolate,
NewRangeError(MessageTemplate::kNormalizationForm, valid_forms),
String);
}
}
int length = string->length();
string = String::Flatten(isolate, string);
icu::UnicodeString result;
std::unique_ptr<base::uc16[]> sap;
UErrorCode status = U_ZERO_ERROR;
icu::UnicodeString input = ToICUUnicodeString(isolate, string);
// Getting a singleton. Should not free it.
const icu::Normalizer2* normalizer =
icu::Normalizer2::getInstance(nullptr, form_name, form_mode, status);
DCHECK(U_SUCCESS(status));
DCHECK_NOT_NULL(normalizer);
int32_t normalized_prefix_length =
normalizer->spanQuickCheckYes(input, status);
// Quick return if the input is already normalized.
if (length == normalized_prefix_length) return string;
icu::UnicodeString unnormalized =
input.tempSubString(normalized_prefix_length);
// Read-only alias of the normalized prefix.
result.setTo(false, input.getBuffer(), normalized_prefix_length);
// copy-on-write; normalize the suffix and append to |result|.
normalizer->normalizeSecondAndAppend(result, unnormalized, status);
if (U_FAILURE(status)) {
THROW_NEW_ERROR(isolate, NewTypeError(MessageTemplate::kIcuError), String);
}
return Intl::ToString(isolate, result);
}
// ICUTimezoneCache calls out to ICU for TimezoneCache
// functionality in a straightforward way.
class ICUTimezoneCache : public base::TimezoneCache {
public:
ICUTimezoneCache() : timezone_(nullptr) { Clear(TimeZoneDetection::kSkip); }
~ICUTimezoneCache() override { Clear(TimeZoneDetection::kSkip); }
const char* LocalTimezone(double time_ms) override;
double DaylightSavingsOffset(double time_ms) override;
double LocalTimeOffset(double time_ms, bool is_utc) override;
void Clear(TimeZoneDetection time_zone_detection) override;
private:
icu::TimeZone* GetTimeZone();
bool GetOffsets(double time_ms, bool is_utc, int32_t* raw_offset,
int32_t* dst_offset);
icu::TimeZone* timezone_;
std::string timezone_name_;
std::string dst_timezone_name_;
};
const char* ICUTimezoneCache::LocalTimezone(double time_ms) {
bool is_dst = DaylightSavingsOffset(time_ms) != 0;
std::string* name = is_dst ? &dst_timezone_name_ : &timezone_name_;
if (name->empty()) {
icu::UnicodeString result;
GetTimeZone()->getDisplayName(is_dst, icu::TimeZone::LONG, result);
result += '\0';
icu::StringByteSink<std::string> byte_sink(name);
result.toUTF8(byte_sink);
}
DCHECK(!name->empty());
return name->c_str();
}
icu::TimeZone* ICUTimezoneCache::GetTimeZone() {
if (timezone_ == nullptr) {
timezone_ = icu::TimeZone::createDefault();
}
return timezone_;
}
bool ICUTimezoneCache::GetOffsets(double time_ms, bool is_utc,
int32_t* raw_offset, int32_t* dst_offset) {
UErrorCode status = U_ZERO_ERROR;
if (is_utc) {
GetTimeZone()->getOffset(time_ms, false, *raw_offset, *dst_offset, status);
} else {
// Note that casting TimeZone to BasicTimeZone is safe because we know that
// icu::TimeZone used here is a BasicTimeZone.
static_cast<const icu::BasicTimeZone*>(GetTimeZone())
->getOffsetFromLocal(time_ms, UCAL_TZ_LOCAL_FORMER,
UCAL_TZ_LOCAL_FORMER, *raw_offset, *dst_offset,
status);
}
return U_SUCCESS(status);
}
double ICUTimezoneCache::DaylightSavingsOffset(double time_ms) {
int32_t raw_offset, dst_offset;
if (!GetOffsets(time_ms, true, &raw_offset, &dst_offset)) return 0;
return dst_offset;
}
double ICUTimezoneCache::LocalTimeOffset(double time_ms, bool is_utc) {
int32_t raw_offset, dst_offset;
if (!GetOffsets(time_ms, is_utc, &raw_offset, &dst_offset)) return 0;
return raw_offset + dst_offset;
}
void ICUTimezoneCache::Clear(TimeZoneDetection time_zone_detection) {
delete timezone_;
timezone_ = nullptr;
timezone_name_.clear();
dst_timezone_name_.clear();
if (time_zone_detection == TimeZoneDetection::kRedetect) {
icu::TimeZone::adoptDefault(icu::TimeZone::detectHostTimeZone());
}
}
base::TimezoneCache* Intl::CreateTimeZoneCache() {
return v8_flags.icu_timezone_data ? new ICUTimezoneCache()
: base::OS::CreateTimezoneCache();
}
Maybe<Intl::MatcherOption> Intl::GetLocaleMatcher(Isolate* isolate,
Handle<JSReceiver> options,
const char* method_name) {
return GetStringOption<Intl::MatcherOption>(
isolate, options, "localeMatcher", method_name, {"best fit", "lookup"},
{Intl::MatcherOption::kBestFit, Intl::MatcherOption::kLookup},
Intl::MatcherOption::kBestFit);
}
Maybe<bool> Intl::GetNumberingSystem(Isolate* isolate,
Handle<JSReceiver> options,
const char* method_name,
std::unique_ptr<char[]>* result) {
const std::vector<const char*> empty_values = {};
Maybe<bool> maybe = GetStringOption(isolate, options, "numberingSystem",
empty_values, method_name, result);
MAYBE_RETURN(maybe, Nothing<bool>());
if (maybe.FromJust() && *result != nullptr) {
if (!IsWellFormedNumberingSystem(result->get())) {
THROW_NEW_ERROR_RETURN_VALUE(
isolate,
NewRangeError(
MessageTemplate::kInvalid,
isolate->factory()->numberingSystem_string(),
isolate->factory()->NewStringFromAsciiChecked(result->get())),
Nothing<bool>());
}
return Just(true);
}
return Just(false);
}
const std::set<std::string>& Intl::GetAvailableLocales() {
static base::LazyInstance<Intl::AvailableLocales<>>::type available_locales =
LAZY_INSTANCE_INITIALIZER;
return available_locales.Pointer()->Get();
}
namespace {
struct CheckCalendar {
static const char* key() { return "calendar"; }
static const char* path() { return nullptr; }
};
} // namespace
const std::set<std::string>& Intl::GetAvailableLocalesForDateFormat() {
static base::LazyInstance<Intl::AvailableLocales<CheckCalendar>>::type
available_locales = LAZY_INSTANCE_INITIALIZER;
return available_locales.Pointer()->Get();
}
constexpr uint16_t kInfinityChar = 0x221e;
Handle<String> Intl::NumberFieldToType(Isolate* isolate,
const NumberFormatSpan& part,
const icu::UnicodeString& text,
bool is_nan) {
switch (static_cast<UNumberFormatFields>(part.field_id)) {
case UNUM_INTEGER_FIELD:
if (is_nan) return isolate->factory()->nan_string();
if (text.charAt(part.begin_pos) == kInfinityChar ||
// en-US-POSIX output "INF" for Infinity
(part.end_pos - part.begin_pos == 3 &&
text.tempSubString(part.begin_pos, 3) == "INF")) {
return isolate->factory()->infinity_string();
}
return isolate->factory()->integer_string();
case UNUM_FRACTION_FIELD:
return isolate->factory()->fraction_string();
case UNUM_DECIMAL_SEPARATOR_FIELD:
return isolate->factory()->decimal_string();
case UNUM_GROUPING_SEPARATOR_FIELD:
return isolate->factory()->group_string();
case UNUM_CURRENCY_FIELD:
return isolate->factory()->currency_string();
case UNUM_PERCENT_FIELD:
return isolate->factory()->percentSign_string();
case UNUM_SIGN_FIELD:
return (text.charAt(part.begin_pos) == '+')
? isolate->factory()->plusSign_string()
: isolate->factory()->minusSign_string();
case UNUM_EXPONENT_SYMBOL_FIELD:
return isolate->factory()->exponentSeparator_string();
case UNUM_EXPONENT_SIGN_FIELD:
return isolate->factory()->exponentMinusSign_string();
case UNUM_EXPONENT_FIELD:
return isolate->factory()->exponentInteger_string();
case UNUM_PERMILL_FIELD:
// We're not creating any permill formatter, and it's not even clear how
// that would be possible with the ICU API.
UNREACHABLE();
case UNUM_COMPACT_FIELD:
return isolate->factory()->compact_string();
case UNUM_MEASURE_UNIT_FIELD:
return isolate->factory()->unit_string();
case UNUM_APPROXIMATELY_SIGN_FIELD:
return isolate->factory()->approximatelySign_string();
default:
UNREACHABLE();
}
}
// A helper function to convert the FormattedValue for several Intl objects.
MaybeHandle<String> Intl::FormattedToString(
Isolate* isolate, const icu::FormattedValue& formatted) {
UErrorCode status = U_ZERO_ERROR;
icu::UnicodeString result = formatted.toString(status);
if (U_FAILURE(status)) {
THROW_NEW_ERROR(isolate, NewTypeError(MessageTemplate::kIcuError), String);
}
return Intl::ToString(isolate, result);
}
MaybeHandle<JSArray> Intl::ToJSArray(
Isolate* isolate, const char* unicode_key,
icu::StringEnumeration* enumeration,
const std::function<bool(const char*)>& removes, bool sort) {
UErrorCode status = U_ZERO_ERROR;
std::vector<std::string> array;
for (const char* item = enumeration->next(nullptr, status);
U_SUCCESS(status) && item != nullptr;
item = enumeration->next(nullptr, status)) {
if (unicode_key != nullptr) {
item = uloc_toUnicodeLocaleType(unicode_key, item);
}
if (removes == nullptr || !(removes)(item)) {
array.push_back(item);
}
}
if (sort) {
std::sort(array.begin(), array.end());
}
return VectorToJSArray(isolate, array);
}
bool Intl::RemoveCollation(const char* collation) {
return strcmp("standard", collation) == 0 || strcmp("search", collation) == 0;
}
// See the list in ecma402 #sec-issanctionedsimpleunitidentifier
std::set<std::string> Intl::SanctionedSimpleUnits() {
return std::set<std::string>(
{"acre", "bit", "byte", "celsius",
"centimeter", "day", "degree", "fahrenheit",
"fluid-ounce", "foot", "gallon", "gigabit",
"gigabyte", "gram", "hectare", "hour",
"inch", "kilobit", "kilobyte", "kilogram",
"kilometer", "liter", "megabit", "megabyte",
"meter", "microsecond", "mile", "mile-scandinavian",
"millimeter", "milliliter", "millisecond", "minute",
"month", "nanosecond", "ounce", "percent",
"petabyte", "pound", "second", "stone",
"terabit", "terabyte", "week", "yard",
"year"});
}
// ecma-402/#sec-isvalidtimezonename
namespace {
bool IsUnicodeStringValidTimeZoneName(const icu::UnicodeString& id) {
UErrorCode status = U_ZERO_ERROR;
icu::UnicodeString canonical;
icu::TimeZone::getCanonicalID(id, canonical, status);
return U_SUCCESS(status) &&
canonical != icu::UnicodeString("Etc/Unknown", -1, US_INV);
}
} // namespace
MaybeHandle<String> Intl::CanonicalizeTimeZoneName(Isolate* isolate,
Handle<String> identifier) {
UErrorCode status = U_ZERO_ERROR;
std::string time_zone =
JSDateTimeFormat::CanonicalizeTimeZoneID(identifier->ToCString().get());
icu::UnicodeString time_zone_ustring =
icu::UnicodeString(time_zone.c_str(), -1, US_INV);
icu::UnicodeString canonical;
icu::TimeZone::getCanonicalID(time_zone_ustring, canonical, status);
CHECK(U_SUCCESS(status));
return JSDateTimeFormat::TimeZoneIdToString(isolate, canonical);
}
bool Intl::IsValidTimeZoneName(Isolate* isolate, Handle<String> id) {
std::string time_zone =
JSDateTimeFormat::CanonicalizeTimeZoneID(id->ToCString().get());
icu::UnicodeString time_zone_ustring =
icu::UnicodeString(time_zone.c_str(), -1, US_INV);
return IsUnicodeStringValidTimeZoneName(time_zone_ustring);
}
bool Intl::IsValidTimeZoneName(const icu::TimeZone& tz) {
icu::UnicodeString id;
tz.getID(id);
return IsUnicodeStringValidTimeZoneName(id);
}
// Function to support Temporal
std::string Intl::TimeZoneIdFromIndex(int32_t index) {
if (index == JSTemporalTimeZone::kUTCTimeZoneIndex) {
return "UTC";
}
std::unique_ptr<icu::StringEnumeration> enumeration(
icu::TimeZone::createEnumeration());
int32_t curr = 0;
const char* id;
UErrorCode status = U_ZERO_ERROR;
while (U_SUCCESS(status) && curr < index &&
((id = enumeration->next(nullptr, status)) != nullptr)) {
CHECK(U_SUCCESS(status));
curr++;
}
CHECK(U_SUCCESS(status));
CHECK(id != nullptr);
return id;
}
int32_t Intl::GetTimeZoneIndex(Isolate* isolate, Handle<String> identifier) {
if (identifier->Equals(*isolate->factory()->UTC_string())) {
return 0;
}
std::string identifier_str(identifier->ToCString().get());
std::unique_ptr<icu::TimeZone> tz(
icu::TimeZone::createTimeZone(identifier_str.c_str()));
if (!IsValidTimeZoneName(*tz)) {
return -1;
}
std::unique_ptr<icu::StringEnumeration> enumeration(
icu::TimeZone::createEnumeration());
int32_t curr = 0;
const char* id;
UErrorCode status = U_ZERO_ERROR;
while (U_SUCCESS(status) &&
(id = enumeration->next(nullptr, status)) != nullptr) {
curr++;
if (identifier_str == id) {
return curr;
}
}
CHECK(U_SUCCESS(status));
// We should not reach here, the !IsValidTimeZoneName should return earlier
UNREACHABLE();
}
Intl::FormatRangeSourceTracker::FormatRangeSourceTracker() {
start_[0] = start_[1] = limit_[0] = limit_[1] = 0;
}
void Intl::FormatRangeSourceTracker::Add(int32_t field, int32_t start,
int32_t limit) {
DCHECK_LT(field, 2);
start_[field] = start;
limit_[field] = limit;
}
Intl::FormatRangeSource Intl::FormatRangeSourceTracker::GetSource(
int32_t start, int32_t limit) const {
FormatRangeSource source = FormatRangeSource::kShared;
if (FieldContains(0, start, limit)) {
source = FormatRangeSource::kStartRange;
} else if (FieldContains(1, start, limit)) {
source = FormatRangeSource::kEndRange;
}
return source;
}
bool Intl::FormatRangeSourceTracker::FieldContains(int32_t field, int32_t start,
int32_t limit) const {
DCHECK_LT(field, 2);
return (start_[field] <= start) && (start <= limit_[field]) &&
(start_[field] <= limit) && (limit <= limit_[field]);
}
Handle<String> Intl::SourceString(Isolate* isolate, FormatRangeSource source) {
switch (source) {
case FormatRangeSource::kShared:
return ReadOnlyRoots(isolate).shared_string_handle();
case FormatRangeSource::kStartRange:
return ReadOnlyRoots(isolate).startRange_string_handle();
case FormatRangeSource::kEndRange:
return ReadOnlyRoots(isolate).endRange_string_handle();
}
}
Handle<String> Intl::DefaultTimeZone(Isolate* isolate) {
icu::UnicodeString id;
{
std::unique_ptr<icu::TimeZone> tz(icu::TimeZone::createDefault());
tz->getID(id);
}
UErrorCode status = U_ZERO_ERROR;
icu::UnicodeString canonical;
icu::TimeZone::getCanonicalID(id, canonical, status);
DCHECK(U_SUCCESS(status));
return JSDateTimeFormat::TimeZoneIdToString(isolate, canonical)
.ToHandleChecked();
}
namespace {
const icu::BasicTimeZone* CreateBasicTimeZoneFromIndex(
int32_t time_zone_index) {
DCHECK_NE(time_zone_index, 0);
return static_cast<const icu::BasicTimeZone*>(
icu::TimeZone::createTimeZone(icu::UnicodeString(
Intl::TimeZoneIdFromIndex(time_zone_index).c_str(), -1, US_INV)));
}
// ICU only support TimeZone information in millisecond but Temporal require
// nanosecond. For most of the case, we find a approximate millisecond by
// floor to the millisecond just past the nanosecond_epoch. For negative epoch
// value, the BigInt Divide will floor closer to zero so we need to minus 1 if
// the remainder is not zero. For the case of finding previous transition, we
// need to ceil to the millisecond in the near future of the nanosecond_epoch.
enum class Direction { kPast, kFuture };
int64_t ApproximateMillisecondEpoch(Isolate* isolate,
Handle<BigInt> nanosecond_epoch,
Direction direction = Direction::kPast) {
Handle<BigInt> one_million = BigInt::FromUint64(isolate, 1000000);
int64_t ms = BigInt::Divide(isolate, nanosecond_epoch, one_million)
.ToHandleChecked()
->AsInt64();
Handle<BigInt> remainder =
BigInt::Remainder(isolate, nanosecond_epoch, one_million)
.ToHandleChecked();
// If the nanosecond_epoch is not on the exact millisecond
if (remainder->ToBoolean()) {
if (direction == Direction::kPast) {
if (remainder->IsNegative()) {
// If the remaninder is negative, we know we have an negative epoch
// We need to decrease one millisecond.
// Move to the previous millisecond
ms -= 1;
}
} else {
if (!remainder->IsNegative()) {
// Move to the future millisecond
ms += 1;
}
}
}
return ms;
}
// Helper function to convert the milliseconds in int64_t
// to a BigInt in nanoseconds.
Handle<BigInt> MillisecondToNanosecond(Isolate* isolate, int64_t ms) {
return BigInt::Multiply(isolate, BigInt::FromInt64(isolate, ms),
BigInt::FromUint64(isolate, 1000000))
.ToHandleChecked();
}
} // namespace
Handle<Object> Intl::GetTimeZoneOffsetTransitionNanoseconds(
Isolate* isolate, int32_t time_zone_index, Handle<BigInt> nanosecond_epoch,
Intl::Transition transition) {
std::unique_ptr<const icu::BasicTimeZone> basic_time_zone(
CreateBasicTimeZoneFromIndex(time_zone_index));
icu::TimeZoneTransition icu_transition;
UBool has_transition;
switch (transition) {
case Intl::Transition::kNext:
has_transition = basic_time_zone->getNextTransition(
ApproximateMillisecondEpoch(isolate, nanosecond_epoch), false,
icu_transition);
break;
case Intl::Transition::kPrevious:
has_transition = basic_time_zone->getPreviousTransition(
ApproximateMillisecondEpoch(isolate, nanosecond_epoch,
Direction::kFuture),
false, icu_transition);
break;
}
if (!has_transition) {
return isolate->factory()->null_value();
}
// #sec-temporal-getianatimezonenexttransition and
// #sec-temporal-getianatimezoneprevioustransition states:
// "The operation returns null if no such transition exists for which t ≤
// ℤ(nsMaxInstant)." and "The operation returns null if no such transition
// exists for which t ≥ ℤ(nsMinInstant)."
//
// nsMinInstant = -nsMaxInstant = -8.64 × 10^21 => msMinInstant = -8.64 x
// 10^15
constexpr int64_t kMsMinInstant = -8.64e15;
// nsMaxInstant = 10^8 × nsPerDay = 8.64 × 10^21 => msMaxInstant = 8.64 x
// 10^15
constexpr int64_t kMsMaxInstant = 8.64e15;
int64_t time_ms = static_cast<int64_t>(icu_transition.getTime());
if (time_ms < kMsMinInstant || time_ms > kMsMaxInstant) {
return isolate->factory()->null_value();
}
return MillisecondToNanosecond(isolate, time_ms);
}
std::vector<Handle<BigInt>> Intl::GetTimeZonePossibleOffsetNanoseconds(
Isolate* isolate, int32_t time_zone_index,
Handle<BigInt> nanosecond_epoch) {
std::unique_ptr<const icu::BasicTimeZone> basic_time_zone(
CreateBasicTimeZoneFromIndex(time_zone_index));
int64_t time_ms = ApproximateMillisecondEpoch(isolate, nanosecond_epoch);
int32_t raw_offset;
int32_t dst_offset;
UErrorCode status = U_ZERO_ERROR;
basic_time_zone->getOffsetFromLocal(time_ms, UCAL_TZ_LOCAL_FORMER,
UCAL_TZ_LOCAL_FORMER, raw_offset,
dst_offset, status);
DCHECK(U_SUCCESS(status));
// offset for time_ms interpretted as before a time zone
// transition
int64_t offset_former = raw_offset + dst_offset;
basic_time_zone->getOffsetFromLocal(time_ms, UCAL_TZ_LOCAL_LATTER,
UCAL_TZ_LOCAL_LATTER, raw_offset,
dst_offset, status);
DCHECK(U_SUCCESS(status));
// offset for time_ms interpretted as after a time zone
// transition
int64_t offset_latter = raw_offset + dst_offset;
std::vector<Handle<BigInt>> result;
if (offset_former == offset_latter) {
// For most of the time, when either interpretation are the same, we are not
// in a moment of offset transition based on rule changing: Just return that
// value.
result.push_back(MillisecondToNanosecond(isolate, offset_former));
} else if (offset_former > offset_latter) {
// When the input represents a local time repeating multiple times at a
// negative time zone transition (e.g. when the daylight saving time ends
// or the time zone offset is decreased due to a time zone rule change).
result.push_back(MillisecondToNanosecond(isolate, offset_former));
result.push_back(MillisecondToNanosecond(isolate, offset_latter));
} else {
// If the offset after the transition is greater than the offset before the
// transition, that mean it is in the moment the time "skip" an hour, or two
// (or six in a Time Zone in south pole) in that case there are no possible
// Time Zone offset for that moment and nothing will be added to the result.
}
return result;
}
int64_t Intl::GetTimeZoneOffsetNanoseconds(Isolate* isolate,
int32_t time_zone_index,
Handle<BigInt> nanosecond_epoch) {
std::unique_ptr<const icu::BasicTimeZone> basic_time_zone(
CreateBasicTimeZoneFromIndex(time_zone_index));
int64_t time_ms = ApproximateMillisecondEpoch(isolate, nanosecond_epoch);
int32_t raw_offset;
int32_t dst_offset;
UErrorCode status = U_ZERO_ERROR;
basic_time_zone->getOffset(time_ms, false, raw_offset, dst_offset, status);
DCHECK(U_SUCCESS(status));
// Turn ms into ns
return static_cast<int64_t>(raw_offset + dst_offset) * 1000000;
}
} // namespace internal
} // namespace v8
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