forked from mirrors/gecko-dev
97 lines
2.4 KiB
C++
97 lines
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_FallbackEncoding_h_
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#define mozilla_dom_FallbackEncoding_h_
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#include "mozilla/NotNull.h"
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#include "mozilla/StaticPtr.h"
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#include "nsIObserver.h"
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#include "nsString.h"
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#include "nsWeakReference.h"
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namespace mozilla {
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class Encoding;
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namespace dom {
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class FallbackEncoding : public nsIObserver, nsSupportsWeakReference {
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOBSERVER
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/**
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* Whether FromTopLevelDomain() should be used.
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*/
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static bool sGuessFallbackFromTopLevelDomain;
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/**
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* Gets the locale-dependent fallback encoding for legacy HTML and plain
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* text content.
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*
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* @param aFallback the outparam for the fallback encoding
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*/
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static NotNull<const Encoding*> FromLocale();
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/**
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* Checks if it is appropriate to call FromTopLevelDomain() for a given TLD.
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*
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* @param aTLD the top-level domain (in Punycode)
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* @return true if OK to call FromTopLevelDomain()
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*/
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static bool IsParticipatingTopLevelDomain(const nsACString& aTLD);
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/**
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* Gets a top-level domain-depedendent fallback encoding for legacy HTML
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* and plain text content
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*
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* @param aTLD the top-level domain (in Punycode)
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* @param aFallback the outparam for the fallback encoding
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*/
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static NotNull<const Encoding*> FromTopLevelDomain(const nsACString& aTLD);
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// public API ends here!
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/**
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* Allocate sInstance used by FromLocale().
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* To be called from nsLayoutStatics only.
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*/
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static void Initialize();
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/**
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* Delete sInstance used by FromLocale().
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* To be called from nsLayoutStatics only.
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*/
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static void Shutdown();
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private:
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/**
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* The fallback cache.
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*/
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static StaticRefPtr<FallbackEncoding> sInstance;
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FallbackEncoding();
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virtual ~FallbackEncoding(){};
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/**
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* Invalidates the cache.
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*/
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void Invalidate() { mFallback = nullptr; }
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static void PrefChanged(const char*, void*);
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/**
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* Gets the fallback encoding label.
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* @param aFallback the fallback encoding
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*/
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NotNull<const Encoding*> Get();
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const Encoding* mFallback;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_FallbackEncoding_h_
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