mirror of
https://github.com/mozilla/gecko-dev.git
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138 lines
3.8 KiB
C++
138 lines
3.8 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/FallbackEncoding.h"
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#include "mozilla/dom/EncodingUtils.h"
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#include "nsUConvPropertySearch.h"
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#include "nsIChromeRegistry.h"
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#include "mozilla/Preferences.h"
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#include "mozilla/Services.h"
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namespace mozilla {
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namespace dom {
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static const char* localesFallbacks[][3] = {
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#include "localesfallbacks.properties.h"
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};
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FallbackEncoding* FallbackEncoding::sInstance = nullptr;
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FallbackEncoding::FallbackEncoding()
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{
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MOZ_COUNT_CTOR(FallbackEncoding);
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MOZ_ASSERT(!FallbackEncoding::sInstance,
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"Singleton already exists.");
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}
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FallbackEncoding::~FallbackEncoding()
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{
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MOZ_COUNT_DTOR(FallbackEncoding);
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}
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void
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FallbackEncoding::Get(nsACString& aFallback)
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{
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if (!mFallback.IsEmpty()) {
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aFallback = mFallback;
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return;
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}
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const nsAdoptingCString& override =
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Preferences::GetCString("intl.charset.fallback.override");
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// Don't let the user break things by setting the override to unreasonable
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// values via about:config
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if (!EncodingUtils::FindEncodingForLabel(override, mFallback) ||
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!EncodingUtils::IsAsciiCompatible(mFallback) ||
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mFallback.EqualsLiteral("UTF-8")) {
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mFallback.Truncate();
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}
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if (!mFallback.IsEmpty()) {
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aFallback = mFallback;
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return;
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}
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nsAutoCString locale;
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nsCOMPtr<nsIXULChromeRegistry> registry =
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mozilla::services::GetXULChromeRegistryService();
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if (registry) {
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registry->GetSelectedLocale(NS_LITERAL_CSTRING("global"), locale);
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}
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// Let's lower case the string just in case unofficial language packs
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// don't stick to conventions.
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ToLowerCase(locale); // ASCII lowercasing with CString input!
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// Special case Traditional Chinese before throwing away stuff after the
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// language itself. Today we only ship zh-TW, but be defensive about
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// possible future values.
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if (locale.EqualsLiteral("zh-tw") ||
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locale.EqualsLiteral("zh-hk") ||
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locale.EqualsLiteral("zh-mo") ||
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locale.EqualsLiteral("zh-hant")) {
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mFallback.AssignLiteral("Big5");
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aFallback = mFallback;
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return;
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}
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// Throw away regions and other variants to accommodate weird stuff seen
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// in telemetry--apparently unofficial language packs.
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int32_t index = locale.FindChar('-');
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if (index >= 0) {
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locale.Truncate(index);
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}
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if (NS_FAILED(nsUConvPropertySearch::SearchPropertyValue(
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localesFallbacks, ArrayLength(localesFallbacks), locale, mFallback))) {
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mFallback.AssignLiteral("windows-1252");
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}
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aFallback = mFallback;
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}
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void
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FallbackEncoding::FromLocale(nsACString& aFallback)
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{
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MOZ_ASSERT(FallbackEncoding::sInstance,
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"Using uninitialized fallback cache.");
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FallbackEncoding::sInstance->Get(aFallback);
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}
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// PrefChangedFunc
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int
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FallbackEncoding::PrefChanged(const char*, void*)
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{
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MOZ_ASSERT(FallbackEncoding::sInstance,
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"Pref callback called with null fallback cache.");
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FallbackEncoding::sInstance->Invalidate();
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return 0;
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}
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void
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FallbackEncoding::Initialize()
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{
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MOZ_ASSERT(!FallbackEncoding::sInstance,
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"Initializing pre-existing fallback cache.");
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FallbackEncoding::sInstance = new FallbackEncoding;
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Preferences::RegisterCallback(FallbackEncoding::PrefChanged,
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"intl.charset.fallback.override",
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nullptr);
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Preferences::RegisterCallback(FallbackEncoding::PrefChanged,
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"general.useragent.locale",
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nullptr);
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}
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void
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FallbackEncoding::Shutdown()
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{
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MOZ_ASSERT(FallbackEncoding::sInstance,
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"Releasing non-existent fallback cache.");
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delete FallbackEncoding::sInstance;
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FallbackEncoding::sInstance = nullptr;
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}
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} // namespace dom
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} // namespace mozilla
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