368 lines
12 KiB
C++
368 lines
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 "nsAutoPtr.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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class nsIDocument;
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class nsIURI;
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class nsIChannel;
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class nsIDocShell;
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class nsIAtom;
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class nsIChannel;
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class nsIContent;
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class nsNodeInfoManager;
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class nsScriptLoader;
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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 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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PR_BEGIN_MACRO \
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if (SINK_LOG_TEST(_lm, _bit)) { \
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PR_LogPrint _args; \
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} \
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PR_END_MACRO
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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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// 1/2 second fudge factor for window creation
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#define NS_DELAY_FOR_WINDOW_CREATION 500000
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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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{
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsContentSink,
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nsICSSLoaderObserver)
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// nsITimerCallback
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NS_DECL_NSITIMERCALLBACK
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// nsICSSLoaderObserver
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NS_IMETHOD StyleSheetLoaded(mozilla::CSSStyleSheet* aSheet,
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bool aWasAlternate,
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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 nsSubstring& aAnchor);
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bool Decode5987Format(nsAString& aEncoded);
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static void InitializeStatics();
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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(nsIDocument* aDoc, nsIURI* aURI,
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nsISupports* aContainer, nsIChannel* aChannel);
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nsresult ProcessHTTPHeaders(nsIChannel* aChannel);
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nsresult ProcessHeaderData(nsIAtom* 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 ProcessLink(const nsSubstring& aAnchor,
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const nsSubstring& aHref, const nsSubstring& aRel,
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const nsSubstring& aTitle, const nsSubstring& aType,
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const nsSubstring& aMedia, const nsSubstring& aCrossOrigin);
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virtual nsresult ProcessStyleLink(nsIContent* aElement,
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const nsSubstring& aHref,
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bool aAlternate,
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const nsSubstring& aTitle,
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const nsSubstring& aType,
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const nsSubstring& aMedia);
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void PrefetchHref(const nsAString &aHref, nsINode *aSource,
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bool aExplicit);
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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(nsIApplicationCache *aLoadApplicationCache,
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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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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(nsIDocument* aDoc);
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protected:
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void
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FavorPerformanceHint(bool perfOverStarvation, uint32_t starvationDelay);
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inline int32_t GetNotificationInterval()
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{
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if (mDynamicLowerValue) {
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return 1000;
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}
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return sNotificationInterval;
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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 = sPerfDeflectCount;
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}
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private:
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// People shouldn't be allocating this class directly. All subclasses should
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// be allocated using a zeroing operator new.
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void* operator new(size_t sz) CPP_THROW_NEW; // Not to be implemented
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protected:
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nsCOMPtr<nsIDocument> 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<nsScriptLoader> 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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// Have we already called BeginUpdate for this set of content changes?
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uint8_t mBeganUpdate : 1;
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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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//
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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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// Do we notify based on time?
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static bool sNotifyOnTimer;
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// Back off timer notification after count.
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static int32_t sBackoffCount;
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// Notification interval in microseconds
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static int32_t sNotificationInterval;
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// How many times to deflect in interactive/perf modes
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static int32_t sInteractiveDeflectCount;
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static int32_t sPerfDeflectCount;
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// 0 = don't check for pending events
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// 1 = don't deflect if there are pending events
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// 2 = bail if there are pending events
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static int32_t sPendingEventMode;
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// How often to probe for pending events. 1=every token
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static int32_t sEventProbeRate;
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// How long to stay off the event loop in interactive/perf modes
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static int32_t sInteractiveParseTime;
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static int32_t sPerfParseTime;
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// How long to be in interactive mode after an event
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static int32_t sInteractiveTime;
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// How long to stay in perf mode after initial loading
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static int32_t sInitialPerfTime;
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// Should we switch between perf-mode and interactive-mode
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static int32_t sEnablePerfMode;
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};
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#endif // _nsContentSink_h_
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