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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/FallbackEncoding.h"
#include "mozilla/dom/EncodingUtils.h"
#include "nsUConvPropertySearch.h"
#include "nsIChromeRegistry.h"
#include "mozilla/Preferences.h"
#include "mozilla/Services.h"
namespace mozilla {
namespace dom {
static const nsUConvProp localesFallbacks[] = {
#include "localesfallbacks.properties.h"
};
static const nsUConvProp domainsFallbacks[] = {
#include "domainsfallbacks.properties.h"
};
static const nsUConvProp nonParticipatingDomains[] = {
#include "nonparticipatingdomains.properties.h"
};
FallbackEncoding* FallbackEncoding::sInstance = nullptr;
bool FallbackEncoding::sGuessFallbackFromTopLevelDomain = true;
FallbackEncoding::FallbackEncoding()
{
MOZ_COUNT_CTOR(FallbackEncoding);
MOZ_ASSERT(!FallbackEncoding::sInstance,
"Singleton already exists.");
}
FallbackEncoding::~FallbackEncoding()
{
MOZ_COUNT_DTOR(FallbackEncoding);
}
void
FallbackEncoding::Get(nsACString& aFallback)
{
if (!mFallback.IsEmpty()) {
aFallback = mFallback;
return;
}
const nsAdoptingCString& override =
Preferences::GetCString("intl.charset.fallback.override");
// Don't let the user break things by setting the override to unreasonable
// values via about:config
if (!EncodingUtils::FindEncodingForLabel(override, mFallback) ||
!EncodingUtils::IsAsciiCompatible(mFallback) ||
mFallback.EqualsLiteral("UTF-8")) {
mFallback.Truncate();
}
if (!mFallback.IsEmpty()) {
aFallback = mFallback;
return;
}
nsAutoCString locale;
nsCOMPtr<nsIXULChromeRegistry> registry =
mozilla::services::GetXULChromeRegistryService();
if (registry) {
registry->GetSelectedLocale(NS_LITERAL_CSTRING("global"), false, locale);
}
// Let's lower case the string just in case unofficial language packs
// don't stick to conventions.
ToLowerCase(locale); // ASCII lowercasing with CString input!
// Special case Traditional Chinese before throwing away stuff after the
// language itself. Today we only ship zh-TW, but be defensive about
// possible future values.
if (locale.EqualsLiteral("zh-tw") ||
locale.EqualsLiteral("zh-hk") ||
locale.EqualsLiteral("zh-mo") ||
locale.EqualsLiteral("zh-hant")) {
mFallback.AssignLiteral("Big5");
aFallback = mFallback;
return;
}
// Throw away regions and other variants to accommodate weird stuff seen
// in telemetry--apparently unofficial language packs.
int32_t index = locale.FindChar('-');
if (index >= 0) {
locale.Truncate(index);
}
if (NS_FAILED(nsUConvPropertySearch::SearchPropertyValue(
localesFallbacks, ArrayLength(localesFallbacks), locale, mFallback))) {
mFallback.AssignLiteral("windows-1252");
}
aFallback = mFallback;
}
void
FallbackEncoding::FromLocale(nsACString& aFallback)
{
MOZ_ASSERT(FallbackEncoding::sInstance,
"Using uninitialized fallback cache.");
FallbackEncoding::sInstance->Get(aFallback);
}
// PrefChangedFunc
void
FallbackEncoding::PrefChanged(const char*, void*)
{
MOZ_ASSERT(FallbackEncoding::sInstance,
"Pref callback called with null fallback cache.");
FallbackEncoding::sInstance->Invalidate();
}
void
FallbackEncoding::Initialize()
{
MOZ_ASSERT(!FallbackEncoding::sInstance,
"Initializing pre-existing fallback cache.");
FallbackEncoding::sInstance = new FallbackEncoding;
Preferences::RegisterCallback(FallbackEncoding::PrefChanged,
"intl.charset.fallback.override",
nullptr);
Preferences::RegisterCallback(FallbackEncoding::PrefChanged,
"general.useragent.locale",
nullptr);
Preferences::AddBoolVarCache(&sGuessFallbackFromTopLevelDomain,
"intl.charset.fallback.tld");
}
void
FallbackEncoding::Shutdown()
{
MOZ_ASSERT(FallbackEncoding::sInstance,
"Releasing non-existent fallback cache.");
delete FallbackEncoding::sInstance;
FallbackEncoding::sInstance = nullptr;
}
bool
FallbackEncoding::IsParticipatingTopLevelDomain(const nsACString& aTLD)
{
nsAutoCString dummy;
return NS_FAILED(nsUConvPropertySearch::SearchPropertyValue(
nonParticipatingDomains,
ArrayLength(nonParticipatingDomains),
aTLD,
dummy));
}
void
FallbackEncoding::FromTopLevelDomain(const nsACString& aTLD,
nsACString& aFallback)
{
if (NS_FAILED(nsUConvPropertySearch::SearchPropertyValue(
domainsFallbacks, ArrayLength(domainsFallbacks), aTLD, aFallback))) {
aFallback.AssignLiteral("windows-1252");
}
}
} // namespace dom
} // namespace mozilla
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