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gecko-dev
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gecko-dev/dom/base/nsContentSink.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "mozilla/Logging.h"
#include "nsCycleCollectionParticipant.h"
#include "nsThreadUtils.h"
class nsIDocument;
class nsIURI;
class nsIChannel;
class nsIDocShell;
class nsIAtom;
class nsIChannel;
class nsIContent;
class nsNodeInfoManager;
class nsScriptLoader;
class nsIApplicationCache;
namespace mozilla {
namespace css {
class Loader;
} // namespace css
} // namespace mozilla
#ifdef DEBUG
extern mozilla::LazyLogModule 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(mozilla::CSSStyleSheet* aSheet,
bool aWasAlternate,
nsresult aStatus) override;
virtual nsresult ProcessMETATag(nsIContent* aContent);
// nsIContentSink implementation helpers
nsresult WillParseImpl(void);
nsresult WillInterruptImpl(void);
nsresult WillResumeImpl(void);
nsresult DidProcessATokenImpl(void);
void WillBuildModelImpl(void);
void DidBuildModelImpl(bool aTerminated);
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, const nsSubstring& aCrossOrigin);
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);
// For PrefetchDNS() 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);
// For Preconnect() aHref can either be the usual
// URI format or of the form "//www.hostname.com" without a scheme.
void Preconnect(const nsAString& aHref, const nsAString& aCrossOrigin);
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;
RefPtr<nsParserBase> mParser;
nsCOMPtr<nsIURI> mDocumentURI;
nsCOMPtr<nsIDocShell> mDocShell;
RefPtr<mozilla::css::Loader> mCSSLoader;
RefPtr<nsNodeInfoManager> mNodeInfoManager;
RefPtr<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_
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