gecko-dev/intl/locale/nsLanguageAtomService.h
Nicholas Nethercote d225f7151b Bug 1400460 - Rename nsIAtom as nsAtom. r=hiro.
(Path is actually r=froydnj.)

Bug 1400459 devirtualized nsIAtom so that it is no longer a subclass of
nsISupports. This means that nsAtom is now a better name for it than nsIAtom.

MozReview-Commit-ID: 91U22X2NydP

--HG--
rename : xpcom/ds/nsIAtom.h => xpcom/ds/nsAtom.h
extra : rebase_source : ac3e904a21b8b48e74534fff964f1623ee937c67
2017-10-03 09:05:19 +11:00

58 lines
2.2 KiB
C++

/* -*- 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 "nsAtom.h"
#include "nsRefPtrHashtable.h"
namespace mozilla {
class Encoding;
}
class nsLanguageAtomService final
{
using Encoding = mozilla::Encoding;
template <typename T> using NotNull = mozilla::NotNull<T>;
public:
static nsLanguageAtomService* GetService();
nsAtom* 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.
nsAtom* GetLanguageGroup(nsAtom* aLanguage, bool* aNeedsToCache = nullptr);
already_AddRefed<nsAtom> GetUncachedLanguageGroup(nsAtom* aLanguage) const;
private:
nsRefPtrHashtable<nsRefPtrHashKey<nsAtom>, nsAtom> mLangToGroup;
RefPtr<nsAtom> mLocaleLanguage;
};
#endif