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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
#ifdef MOZILLA_INTERNAL_API
# include "mozilla/Assertions.h"
# include "mozilla/UniquePtr.h"
# include "ICUUtils.h"
# include "mozilla/ClearOnShutdown.h"
# include "mozilla/StaticPrefs_dom.h"
# include "mozilla/intl/LocaleService.h"
# include "mozilla/intl/FormatBuffer.h"
# include "mozilla/intl/NumberFormat.h"
# include "mozilla/intl/NumberParser.h"
# include "nsIContent.h"
# include "mozilla/dom/Document.h"
# include "nsString.h"
using namespace mozilla;
using mozilla::intl::LocaleService;
already_AddRefed<nsAtom> ICUUtils::LanguageTagIterForContent::GetNext() {
if (mCurrentFallbackIndex < 0) {
mCurrentFallbackIndex = 0;
// Try the language specified by a 'lang'/'xml:lang' attribute on mContent
// or any ancestor, if such an attribute is specified:
if (auto* lang = mContent->GetLang()) {
return do_AddRef(lang);
}
}
if (mCurrentFallbackIndex < 1) {
mCurrentFallbackIndex = 1;
// Else try the language specified by any Content-Language HTTP header or
// pragma directive:
if (nsAtom* lang = mContent->OwnerDoc()->GetContentLanguage()) {
return do_AddRef(lang);
}
}
if (mCurrentFallbackIndex < 2) {
mCurrentFallbackIndex = 2;
// Else take the app's locale (or en-US, if spoof English applies):
if (mContent->OwnerDoc()->ShouldResistFingerprinting(RFPTarget::JSLocale)) {
return NS_Atomize("en-US");
}
nsAutoCString appLocale;
LocaleService::GetInstance()->GetAppLocaleAsBCP47(appLocale);
return NS_Atomize(appLocale);
}
// TODO: Probably not worth it, but maybe have a fourth fallback to using
// the OS locale?
return nullptr;
}
/* static */
bool ICUUtils::LocalizeNumber(double aValue,
LanguageTagIterForContent& aLangTags,
nsAString& aLocalizedValue) {
MOZ_ASSERT(aLangTags.IsAtStart(), "Don't call Next() before passing");
MOZ_ASSERT(NS_IsMainThread());
using LangToFormatterCache =
nsTHashMap<RefPtr<nsAtom>, UniquePtr<intl::NumberFormat>>;
static StaticAutoPtr<LangToFormatterCache> sCache;
if (!sCache) {
sCache = new LangToFormatterCache();
ClearOnShutdown(&sCache);
}
intl::NumberFormatOptions options;
if (StaticPrefs::dom_forms_number_grouping()) {
options.mGrouping = intl::NumberFormatOptions::Grouping::Always;
} else {
options.mGrouping = intl::NumberFormatOptions::Grouping::Never;
}
// ICU default is a maximum of 3 significant fractional digits. We don't
// want that limit, so we set it to the maximum that a double can represent
// (14-16 decimal fractional digits).
options.mFractionDigits = Some(std::make_pair(0, 16));
while (RefPtr<nsAtom> langTag = aLangTags.GetNext()) {
auto& formatter = sCache->LookupOrInsertWith(langTag, [&] {
nsAutoCString tag;
langTag->ToUTF8String(tag);
return intl::NumberFormat::TryCreate(tag, options).unwrapOr(nullptr);
});
if (!formatter) {
continue;
}
intl::nsTStringToBufferAdapter adapter(aLocalizedValue);
if (formatter->format(aValue, adapter).isOk()) {
return true;
}
}
return false;
}
/* static */
double ICUUtils::ParseNumber(const nsAString& aValue,
LanguageTagIterForContent& aLangTags) {
MOZ_ASSERT(aLangTags.IsAtStart(), "Don't call Next() before passing");
using LangToParserCache =
nsTHashMap<RefPtr<nsAtom>, UniquePtr<intl::NumberParser>>;
static StaticAutoPtr<LangToParserCache> sCache;
if (aValue.IsEmpty()) {
return std::numeric_limits<float>::quiet_NaN();
}
if (!sCache) {
sCache = new LangToParserCache();
ClearOnShutdown(&sCache);
}
const Span<const char16_t> value(aValue.BeginReading(), aValue.Length());
while (RefPtr<nsAtom> langTag = aLangTags.GetNext()) {
auto& parser = sCache->LookupOrInsertWith(langTag, [&] {
nsAutoCString tag;
langTag->ToUTF8String(tag);
return intl::NumberParser::TryCreate(
tag.get(), StaticPrefs::dom_forms_number_grouping())
.unwrapOr(nullptr);
});
if (!parser) {
continue;
}
static_assert(sizeof(UChar) == 2 && sizeof(nsAString::char_type) == 2,
"Unexpected character size - the following cast is unsafe");
auto parseResult = parser->ParseDouble(value);
if (!parseResult.isOk()) {
continue;
}
std::pair<double, int32_t> parsed = parseResult.unwrap();
if (parsed.second == static_cast<int32_t>(value.Length())) {
return parsed.first;
}
}
return std::numeric_limits<float>::quiet_NaN();
}
/* static */
void ICUUtils::AssignUCharArrayToString(UChar* aICUString, int32_t aLength,
nsAString& aMozString) {
// Both ICU's UnicodeString and Mozilla's nsAString use UTF-16, so we can
// cast here.
static_assert(sizeof(UChar) == 2 && sizeof(nsAString::char_type) == 2,
"Unexpected character size - the following cast is unsafe");
aMozString.Assign((const nsAString::char_type*)aICUString, aLength);
NS_ASSERTION((int32_t)aMozString.Length() == aLength, "Conversion failed");
}
/* static */
nsresult ICUUtils::ICUErrorToNsResult(const intl::ICUError aError) {
switch (aError) {
case intl::ICUError::OutOfMemory:
return NS_ERROR_OUT_OF_MEMORY;
default:
return NS_ERROR_FAILURE;
}
}
#endif /* MOZILLA_INTERNAL_API */