зеркало из https://github.com/mozilla/gecko-dev.git
344 строки
12 KiB
C++
344 строки
12 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
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* Base class for the XML and HTML content sinks, which construct a
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* DOM based on information from the parser.
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*/
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#ifndef _nsContentSink_h_
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#define _nsContentSink_h_
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// Base class for contentsink implementations.
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#include "mozilla/Attributes.h"
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#include "nsICSSLoaderObserver.h"
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#include "nsWeakReference.h"
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#include "nsCOMPtr.h"
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#include "nsString.h"
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#include "nsGkAtoms.h"
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#include "nsITimer.h"
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#include "nsStubDocumentObserver.h"
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#include "nsIContentSink.h"
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#include "mozilla/Logging.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsThreadUtils.h"
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#include "mozilla/StaticPrefs_content.h"
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class nsIURI;
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class nsIChannel;
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class nsIDocShell;
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class nsAtom;
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class nsIChannel;
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class nsIContent;
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class nsNodeInfoManager;
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class nsIApplicationCache;
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namespace mozilla {
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namespace css {
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class Loader;
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} // namespace css
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namespace dom {
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class Document;
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class ScriptLoader;
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} // namespace dom
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} // namespace mozilla
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#ifdef DEBUG
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extern mozilla::LazyLogModule gContentSinkLogModuleInfo;
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# define SINK_TRACE_CALLS 0x1
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# define SINK_TRACE_REFLOW 0x2
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# define SINK_ALWAYS_REFLOW 0x4
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# define SINK_LOG_TEST(_lm, _bit) (int((_lm)->Level()) & (_bit))
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# define SINK_TRACE(_lm, _bit, _args) \
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do { \
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if (SINK_LOG_TEST(_lm, _bit)) { \
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printf_stderr _args; \
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} \
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} while (0)
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#else
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# define SINK_TRACE(_lm, _bit, _args)
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#endif
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#undef SINK_NO_INCREMENTAL
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//----------------------------------------------------------------------
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class nsContentSink : public nsICSSLoaderObserver,
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public nsSupportsWeakReference,
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public nsStubDocumentObserver,
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public nsITimerCallback,
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public nsINamed {
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protected:
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typedef mozilla::dom::Document Document;
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private:
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsContentSink, nsICSSLoaderObserver)
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// nsITimerCallback
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NS_DECL_NSITIMERCALLBACK
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NS_DECL_NSINAMED
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// nsICSSLoaderObserver
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NS_IMETHOD StyleSheetLoaded(mozilla::StyleSheet* aSheet, bool aWasDeferred,
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nsresult aStatus) override;
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virtual nsresult ProcessMETATag(nsIContent* aContent);
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// nsIContentSink implementation helpers
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nsresult WillParseImpl(void);
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nsresult WillInterruptImpl(void);
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nsresult WillResumeImpl(void);
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nsresult DidProcessATokenImpl(void);
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void WillBuildModelImpl(void);
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void DidBuildModelImpl(bool aTerminated);
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void DropParserAndPerfHint(void);
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bool IsScriptExecutingImpl();
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void NotifyAppend(nsIContent* aContent, uint32_t aStartIndex);
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// nsIDocumentObserver
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NS_DECL_NSIDOCUMENTOBSERVER_BEGINUPDATE
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NS_DECL_NSIDOCUMENTOBSERVER_ENDUPDATE
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virtual void UpdateChildCounts() = 0;
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bool IsTimeToNotify();
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bool LinkContextIsOurDocument(const nsAString& aAnchor);
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bool Decode5987Format(nsAString& aEncoded);
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protected:
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nsContentSink();
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virtual ~nsContentSink();
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enum CacheSelectionAction {
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// There is no offline cache manifest specified by the document,
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// or the document was loaded from a cache other than the one it
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// specifies via its manifest attribute and IS NOT a top-level
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// document, or an error occurred during the cache selection
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// algorithm.
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CACHE_SELECTION_NONE = 0,
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// The offline cache manifest must be updated.
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CACHE_SELECTION_UPDATE = 1,
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// The document was loaded from a cache other than the one it
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// specifies via its manifest attribute and IS a top-level
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// document. In this case, the document is marked as foreign in
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// the cache it was loaded from and must be reloaded from the
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// correct cache (the one it specifies).
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CACHE_SELECTION_RELOAD = 2,
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// Some conditions require we must reselect the cache without the manifest
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CACHE_SELECTION_RESELECT_WITHOUT_MANIFEST = 3
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};
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nsresult Init(Document* aDoc, nsIURI* aURI, nsISupports* aContainer,
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nsIChannel* aChannel);
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nsresult ProcessHTTPHeaders(nsIChannel* aChannel);
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nsresult ProcessHeaderData(nsAtom* aHeader, const nsAString& aValue,
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nsIContent* aContent = nullptr);
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nsresult ProcessLinkHeader(const nsAString& aLinkData);
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nsresult ProcessLinkFromHeader(
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const nsAString& aAnchor, const nsAString& aHref, const nsAString& aRel,
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const nsAString& aTitle, const nsAString& aIntegrity,
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const nsAString& aSrcset, const nsAString& aSizes, const nsAString& aType,
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const nsAString& aMedia, const nsAString& aCrossOrigin,
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const nsAString& aReferrerPolicy, const nsAString& aAs);
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virtual nsresult ProcessStyleLinkFromHeader(
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const nsAString& aHref, bool aAlternate, const nsAString& aTitle,
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const nsAString& aIntegrity, const nsAString& aType,
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const nsAString& aMedia, const nsAString& aReferrerPolicy);
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void PrefetchHref(const nsAString& aHref, const nsAString& aAs,
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const nsAString& aType, const nsAString& aMedia);
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void PreloadHref(const nsAString& aHref, const nsAString& aAs,
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const nsAString& aType, const nsAString& aMedia,
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const nsAString& aIntegrity, const nsAString& aSrcset,
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const nsAString& aSizes, const nsAString& aCORS,
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const nsAString& aReferrerPolicy);
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// For PrefetchDNS() aHref can either be the usual
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// URI format or of the form "//www.hostname.com" without a scheme.
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void PrefetchDNS(const nsAString& aHref);
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// Gets the cache key (used to identify items in a cache) of the channel.
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nsresult GetChannelCacheKey(nsIChannel* aChannel, nsACString& aCacheKey);
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// There is an offline cache manifest attribute specified and the
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// document is allowed to use the offline cache. Process the cache
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// selection algorithm for this document and the manifest. Result is
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// an action that must be taken on the manifest, see
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// CacheSelectionAction enum above.
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//
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// @param aLoadApplicationCache
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// The application cache from which the load originated, if
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// any.
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// @param aManifestURI
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// The manifest URI listed in the document.
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// @param aFetchedWithHTTPGetOrEquiv
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// TRUE if this was fetched using the HTTP GET method.
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// @param aAction
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// Out parameter, returns the action that should be performed
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// by the calling function.
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nsresult SelectDocAppCache(nsIApplicationCache* aLoadApplicationCache,
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nsIURI* aManifestURI,
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bool aFetchedWithHTTPGetOrEquiv,
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CacheSelectionAction* aAction);
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// There is no offline cache manifest attribute specified. Process
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// the cache selection algorithm w/o the manifest. Result is an
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// action that must be taken, see CacheSelectionAction enum
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// above. In case the offline cache manifest has to be updated the
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// manifest URI is returned in aManifestURI.
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//
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// @param aLoadApplicationCache
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// The application cache from which the load originated, if
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// any.
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// @param aManifestURI
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// Out parameter, returns the manifest URI of the cache that
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// was selected.
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// @param aAction
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// Out parameter, returns the action that should be performed
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// by the calling function.
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nsresult SelectDocAppCacheNoManifest(
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nsIApplicationCache* aLoadApplicationCache, nsIURI** aManifestURI,
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CacheSelectionAction* aAction);
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public:
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// Searches for the offline cache manifest attribute and calls one
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// of the above defined methods to select the document's application
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// cache, let it be associated with the document and eventually
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// schedule the cache update process.
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// This method MUST be called with the empty string as the argument
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// when there is no manifest attribute!
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void ProcessOfflineManifest(const nsAString& aManifestSpec);
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// Extracts the manifest attribute from the element if it is the root
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// element and calls the above method.
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void ProcessOfflineManifest(nsIContent* aElement);
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// For Preconnect() aHref can either be the usual
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// URI format or of the form "//www.hostname.com" without a scheme.
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void Preconnect(const nsAString& aHref, const nsAString& aCrossOrigin);
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protected:
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// Tries to scroll to the URI's named anchor. Once we've successfully
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// done that, further calls to this method will be ignored.
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MOZ_CAN_RUN_SCRIPT_BOUNDARY void ScrollToRef();
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// Start layout. If aIgnorePendingSheets is true, this will happen even if
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// we still have stylesheet loads pending. Otherwise, we'll wait until the
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// stylesheets are all done loading.
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public:
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void StartLayout(bool aIgnorePendingSheets);
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static void NotifyDocElementCreated(Document* aDoc);
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Document* GetDocument() { return mDocument; }
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protected:
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void FavorPerformanceHint(bool perfOverStarvation, uint32_t starvationDelay);
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inline int32_t GetNotificationInterval() {
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if (mDynamicLowerValue) {
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return 1000;
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}
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return mozilla::StaticPrefs::content_notify_interval();
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}
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virtual nsresult FlushTags() = 0;
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// Later on we might want to make this more involved somehow
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// (e.g. stop waiting after some timeout or whatnot).
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bool WaitForPendingSheets() { return mPendingSheetCount > 0; }
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void DoProcessLinkHeader();
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void StopDeflecting() {
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mDeflectedCount = mozilla::StaticPrefs::content_sink_perf_deflect_count();
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}
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protected:
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RefPtr<Document> mDocument;
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RefPtr<nsParserBase> mParser;
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nsCOMPtr<nsIURI> mDocumentURI;
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nsCOMPtr<nsIDocShell> mDocShell;
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RefPtr<mozilla::css::Loader> mCSSLoader;
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RefPtr<nsNodeInfoManager> mNodeInfoManager;
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RefPtr<mozilla::dom::ScriptLoader> mScriptLoader;
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// back off timer notification after count
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int32_t mBackoffCount;
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// Time of last notification
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// Note: mLastNotificationTime is only valid once mLayoutStarted is true.
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PRTime mLastNotificationTime;
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// Timer used for notification
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nsCOMPtr<nsITimer> mNotificationTimer;
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uint8_t mLayoutStarted : 1;
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uint8_t mDynamicLowerValue : 1;
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uint8_t mParsing : 1;
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uint8_t mDroppedTimer : 1;
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// If true, we deferred starting layout until sheets load
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uint8_t mDeferredLayoutStart : 1;
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// If true, we deferred notifications until sheets load
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uint8_t mDeferredFlushTags : 1;
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// If false, we're not ourselves a document observer; that means we
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// shouldn't be performing any more content model notifications,
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// since we're not longer updating our child counts.
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uint8_t mIsDocumentObserver : 1;
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// True if this is parser is a fragment parser or an HTML DOMParser.
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// XML DOMParser leaves this to false for now!
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uint8_t mRunsToCompletion : 1;
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// True if we are blocking load event.
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bool mIsBlockingOnload : 1;
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//
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// -- Can interrupt parsing members --
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//
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// The number of tokens that have been processed since we measured
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// if it's time to return to the main event loop.
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uint32_t mDeflectedCount;
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// Is there currently a pending event?
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bool mHasPendingEvent;
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// When to return to the main event loop
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uint32_t mCurrentParseEndTime;
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int32_t mBeginLoadTime;
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// Last mouse event or keyboard event time sampled by the content
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// sink
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uint32_t mLastSampledUserEventTime;
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int32_t mInMonolithicContainer;
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int32_t mInNotification;
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uint32_t mUpdatesInNotification;
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uint32_t mPendingSheetCount;
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nsRevocableEventPtr<nsRunnableMethod<nsContentSink, void, false> >
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mProcessLinkHeaderEvent;
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};
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#endif // _nsContentSink_h_
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