The Tor Browser: content/base/src/nsContentSink.h@6474c204b198 (annotated)

content/base/src/nsContentSink.h@6474c204b198 (annotated)

content/base/src/nsContentSink.h

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- 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/. */
 /*
  * Base class for the XML and HTML content sinks, which construct a
  * DOM based on information from the parser.
  */
 #ifndef _nsContentSink_h_
 #define _nsContentSink_h_
 // Base class for contentsink implementations.
 #include "mozilla/Attributes.h"
 #include "nsICSSLoaderObserver.h"
 #include "nsWeakReference.h"
 #include "nsCOMPtr.h"
 #include "nsString.h"
 #include "nsAutoPtr.h"
 #include "nsGkAtoms.h"
 #include "nsITimer.h"
 #include "nsStubDocumentObserver.h"
 #include "nsIContentSink.h"
 #include "prlog.h"
 #include "nsCycleCollectionParticipant.h"
 #include "nsThreadUtils.h"
 class nsIDocument;
 class nsIURI;
 class nsIChannel;
 class nsIDocShell;
 class nsIParser;
 class nsIAtom;
 class nsIChannel;
 class nsIContent;
 class nsViewManager;
 class nsNodeInfoManager;
 class nsScriptLoader;
 class nsIApplicationCache;
 namespace mozilla {
 namespace css {
 class Loader;
 }
 }
 #ifdef DEBUG
 extern PRLogModuleInfo* gContentSinkLogModuleInfo;
 #define SINK_TRACE_CALLS              0x1
 #define SINK_TRACE_REFLOW             0x2
 #define SINK_ALWAYS_REFLOW            0x4
 #define SINK_LOG_TEST(_lm, _bit) (int((_lm)->level) & (_bit))
 #define SINK_TRACE(_lm, _bit, _args) \
   PR_BEGIN_MACRO                     \
     if (SINK_LOG_TEST(_lm, _bit)) {  \
       PR_LogPrint _args;             \
     }                                \
   PR_END_MACRO
 #else
 #define SINK_TRACE(_lm, _bit, _args)
 #endif
 #undef SINK_NO_INCREMENTAL
 //----------------------------------------------------------------------
 // 1/2 second fudge factor for window creation
 #define NS_DELAY_FOR_WINDOW_CREATION  500000
 class nsContentSink : public nsICSSLoaderObserver,
                       public nsSupportsWeakReference,
                       public nsStubDocumentObserver,
                       public nsITimerCallback
 {
   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
   NS_DECL_CYCLE_COLLECTION_CLASS_AMBIGUOUS(nsContentSink,
                                            nsICSSLoaderObserver)
     // nsITimerCallback
   NS_DECL_NSITIMERCALLBACK
   // nsICSSLoaderObserver
   NS_IMETHOD StyleSheetLoaded(nsCSSStyleSheet* aSheet, bool aWasAlternate,
                               nsresult aStatus) MOZ_OVERRIDE;
   virtual nsresult ProcessMETATag(nsIContent* aContent);
   // nsIContentSink implementation helpers
   NS_HIDDEN_(nsresult) WillParseImpl(void);
   NS_HIDDEN_(nsresult) WillInterruptImpl(void);
   NS_HIDDEN_(nsresult) WillResumeImpl(void);
   NS_HIDDEN_(nsresult) DidProcessATokenImpl(void);
   NS_HIDDEN_(void) WillBuildModelImpl(void);
   NS_HIDDEN_(void) DidBuildModelImpl(bool aTerminated);
   NS_HIDDEN_(void) DropParserAndPerfHint(void);
   bool IsScriptExecutingImpl();
   void NotifyAppend(nsIContent* aContent, uint32_t aStartIndex);
   // nsIDocumentObserver
   NS_DECL_NSIDOCUMENTOBSERVER_BEGINUPDATE
   NS_DECL_NSIDOCUMENTOBSERVER_ENDUPDATE
   virtual void UpdateChildCounts() = 0;
   bool IsTimeToNotify();
   bool LinkContextIsOurDocument(const nsSubstring& aAnchor);
   bool Decode5987Format(nsAString& aEncoded);
   static void InitializeStatics();
 protected:
   nsContentSink();
   virtual ~nsContentSink();
   enum CacheSelectionAction {
     // There is no offline cache manifest specified by the document,
     // or the document was loaded from a cache other than the one it
     // specifies via its manifest attribute and IS NOT a top-level
     // document, or an error occurred during the cache selection
     // algorithm.
     CACHE_SELECTION_NONE = 0,
     // The offline cache manifest must be updated.
     CACHE_SELECTION_UPDATE = 1,
     // The document was loaded from a cache other than the one it
     // specifies via its manifest attribute and IS a top-level
     // document.  In this case, the document is marked as foreign in
     // the cache it was loaded from and must be reloaded from the
     // correct cache (the one it specifies).
     CACHE_SELECTION_RELOAD = 2,
     // Some conditions require we must reselect the cache without the manifest
     CACHE_SELECTION_RESELECT_WITHOUT_MANIFEST = 3
   };
   nsresult Init(nsIDocument* aDoc, nsIURI* aURI,
                 nsISupports* aContainer, nsIChannel* aChannel);
   nsresult ProcessHTTPHeaders(nsIChannel* aChannel);
   nsresult ProcessHeaderData(nsIAtom* aHeader, const nsAString& aValue,
                              nsIContent* aContent = nullptr);
   nsresult ProcessLinkHeader(const nsAString& aLinkData);
   nsresult ProcessLink(const nsSubstring& aAnchor,
                        const nsSubstring& aHref, const nsSubstring& aRel,
                        const nsSubstring& aTitle, const nsSubstring& aType,
                        const nsSubstring& aMedia);
   virtual nsresult ProcessStyleLink(nsIContent* aElement,
                                     const nsSubstring& aHref,
                                     bool aAlternate,
                                     const nsSubstring& aTitle,
                                     const nsSubstring& aType,
                                     const nsSubstring& aMedia);
   void PrefetchHref(const nsAString &aHref, nsINode *aSource,
                     bool aExplicit);
   // aHref can either be the usual URI format or of the form "//www.hostname.com"
   // without a scheme.
   void PrefetchDNS(const nsAString &aHref);
   // Gets the cache key (used to identify items in a cache) of the channel.
   nsresult GetChannelCacheKey(nsIChannel* aChannel, nsACString& aCacheKey);
   // There is an offline cache manifest attribute specified and the
   // document is allowed to use the offline cache.  Process the cache
   // selection algorithm for this document and the manifest. Result is
   // an action that must be taken on the manifest, see
   // CacheSelectionAction enum above.
   //
   // @param aLoadApplicationCache
   //        The application cache from which the load originated, if
   //        any.
   // @param aManifestURI
   //        The manifest URI listed in the document.
   // @param aFetchedWithHTTPGetOrEquiv
   //        TRUE if this was fetched using the HTTP GET method.
   // @param aAction
   //        Out parameter, returns the action that should be performed
   //        by the calling function.
   nsresult SelectDocAppCache(nsIApplicationCache *aLoadApplicationCache,
                              nsIURI *aManifestURI,
                              bool aFetchedWithHTTPGetOrEquiv,
                              CacheSelectionAction *aAction);
   // There is no offline cache manifest attribute specified.  Process
   // the cache selection algorithm w/o the manifest. Result is an
   // action that must be taken, see CacheSelectionAction enum
   // above. In case the offline cache manifest has to be updated the
   // manifest URI is returned in aManifestURI.
   //
   // @param aLoadApplicationCache
   //        The application cache from which the load originated, if
   //        any.
   // @param aManifestURI
   //        Out parameter, returns the manifest URI of the cache that
   //        was selected.
   // @param aAction
   //        Out parameter, returns the action that should be performed
   //        by the calling function.
   nsresult SelectDocAppCacheNoManifest(nsIApplicationCache *aLoadApplicationCache,
                                        nsIURI **aManifestURI,
                                        CacheSelectionAction *aAction);
 public:
   // Searches for the offline cache manifest attribute and calls one
   // of the above defined methods to select the document's application
   // cache, let it be associated with the document and eventually
   // schedule the cache update process.
   // This method MUST be called with the empty string as the argument
   // when there is no manifest attribute!
   void ProcessOfflineManifest(const nsAString& aManifestSpec);
   // Extracts the manifest attribute from the element if it is the root
   // element and calls the above method.
   void ProcessOfflineManifest(nsIContent *aElement);
 protected:
   // Tries to scroll to the URI's named anchor. Once we've successfully
   // done that, further calls to this method will be ignored.
   void ScrollToRef();
   // Start layout.  If aIgnorePendingSheets is true, this will happen even if
   // we still have stylesheet loads pending.  Otherwise, we'll wait until the
   // stylesheets are all done loading.
 public:
   void StartLayout(bool aIgnorePendingSheets);
   static void NotifyDocElementCreated(nsIDocument* aDoc);
 protected:
   void
   FavorPerformanceHint(bool perfOverStarvation, uint32_t starvationDelay);
   inline int32_t GetNotificationInterval()
   {
     if (mDynamicLowerValue) {
       return 1000;
     }
     return sNotificationInterval;
   }
   virtual nsresult FlushTags() = 0;
   // Later on we might want to make this more involved somehow
   // (e.g. stop waiting after some timeout or whatnot).
   bool WaitForPendingSheets() { return mPendingSheetCount > 0; }
   void DoProcessLinkHeader();
   void StopDeflecting() {
     mDeflectedCount = sPerfDeflectCount;
   }
 private:
   // People shouldn't be allocating this class directly.  All subclasses should
   // be allocated using a zeroing operator new.
   void* operator new(size_t sz) CPP_THROW_NEW;  // Not to be implemented
 protected:
   nsCOMPtr<nsIDocument>         mDocument;
   nsRefPtr<nsParserBase>        mParser;
   nsCOMPtr<nsIURI>              mDocumentURI;
   nsCOMPtr<nsIDocShell>         mDocShell;
   nsRefPtr<mozilla::css::Loader> mCSSLoader;
   nsRefPtr<nsNodeInfoManager>   mNodeInfoManager;
   nsRefPtr<nsScriptLoader>      mScriptLoader;
   // back off timer notification after count
   int32_t mBackoffCount;
   // Time of last notification
   // Note: mLastNotificationTime is only valid once mLayoutStarted is true.
   PRTime mLastNotificationTime;
   // Timer used for notification
   nsCOMPtr<nsITimer> mNotificationTimer;
   // Have we already called BeginUpdate for this set of content changes?
   uint8_t mBeganUpdate : 1;
   uint8_t mLayoutStarted : 1;
   uint8_t mDynamicLowerValue : 1;
   uint8_t mParsing : 1;
   uint8_t mDroppedTimer : 1;
   // If true, we deferred starting layout until sheets load
   uint8_t mDeferredLayoutStart : 1;
   // If true, we deferred notifications until sheets load
   uint8_t mDeferredFlushTags : 1;
   // If false, we're not ourselves a document observer; that means we
   // shouldn't be performing any more content model notifications,
   // since we're not longer updating our child counts.
   uint8_t mIsDocumentObserver : 1;
   // True if this is parser is a fragment parser or an HTML DOMParser.
   // XML DOMParser leaves this to false for now!
   uint8_t mRunsToCompletion : 1;
   //
   // -- Can interrupt parsing members --
   //
   // The number of tokens that have been processed since we measured
   // if it's time to return to the main event loop.
   uint32_t mDeflectedCount;
   // Is there currently a pending event?
   bool mHasPendingEvent;
   // When to return to the main event loop
   uint32_t mCurrentParseEndTime;
   int32_t mBeginLoadTime;
   // Last mouse event or keyboard event time sampled by the content
   // sink
   uint32_t mLastSampledUserEventTime;
   int32_t mInMonolithicContainer;
   int32_t mInNotification;
   uint32_t mUpdatesInNotification;
   uint32_t mPendingSheetCount;
   nsRevocableEventPtr<nsRunnableMethod<nsContentSink, void, false> >
     mProcessLinkHeaderEvent;
   // Do we notify based on time?
   static bool sNotifyOnTimer;
   // Back off timer notification after count.
   static int32_t sBackoffCount;
   // Notification interval in microseconds
   static int32_t sNotificationInterval;
   // How many times to deflect in interactive/perf modes
   static int32_t sInteractiveDeflectCount;
   static int32_t sPerfDeflectCount;
   // 0 = don't check for pending events
   // 1 = don't deflect if there are pending events
   // 2 = bail if there are pending events
   static int32_t sPendingEventMode;
   // How often to probe for pending events. 1=every token
   static int32_t sEventProbeRate;
   // How long to stay off the event loop in interactive/perf modes
   static int32_t sInteractiveParseTime;
   static int32_t sPerfParseTime;
   // How long to be in interactive mode after an event
   static int32_t sInteractiveTime;
   // How long to stay in perf mode after initial loading
   static int32_t sInitialPerfTime;
   // Should we switch between perf-mode and interactive-mode
   static int32_t sEnablePerfMode;
 };
 #endif // _nsContentSink_h_

The Tor Browser / annotate

content/base/src/nsContentSink.h@6474c204b198 (annotated)

content/base/src/nsContentSink.h