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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
/*
* The nsILanguageAtomService provides a mapping from languages or charsets
* to language groups, and access to the system locale language.
*/
#ifndef nsLanguageAtomService_h_
#define nsLanguageAtomService_h_
#include "mozilla/NotNull.h"
#include "nsCOMPtr.h"
#include "nsAtomHashKeys.h"
#include "nsTHashMap.h"
namespace mozilla {
class Encoding;
}
class nsLanguageAtomService final {
using Encoding = mozilla::Encoding;
template <typename T>
using NotNull = mozilla::NotNull<T>;
public:
static nsLanguageAtomService* GetService();
static void Shutdown();
nsStaticAtom* LookupLanguage(const nsACString& aLanguage);
already_AddRefed<nsAtom> LookupCharSet(NotNull<const Encoding*> aCharSet);
nsAtom* GetLocaleLanguage();
// Returns the language group that the specified language is a part of.
//
// aNeedsToCache is used for two things. If null, it indicates that
// the nsLanguageAtomService is safe to cache the result of the
// language group lookup, either because we're on the main thread,
// or because we're on a style worker thread but the font lock has
// been acquired. If non-null, it indicates that it's not safe to
// cache the result of the language group lookup (because we're on
// a style worker thread without the lock acquired). In this case,
// GetLanguageGroup will store true in *aNeedsToCache true if we
// would have cached the result of a new lookup, and false if we
// were able to use an existing cached result. Thus, callers that
// get a true *aNeedsToCache outparam value should make an effort
// to re-call GetLanguageGroup when it is safe to cache, to avoid
// recomputing the language group again later.
nsStaticAtom* GetLanguageGroup(nsAtom* aLanguage,
bool* aNeedsToCache = nullptr);
nsStaticAtom* GetUncachedLanguageGroup(nsAtom* aLanguage) const;
private:
nsTHashMap<RefPtr<nsAtom>, nsStaticAtom*> mLangToGroup;
RefPtr<nsAtom> mLocaleLanguage;
};
#endif
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