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