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gecko-dev/layout/style/nsStyleSet.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#include "nsCOMPtr.h"
#include "nsIStyleSet.h"
#include "nsIStyleSheet.h"
#include "nsIStyleRuleProcessor.h"
#include "nsIStyleRule.h"
#include "nsIStyleContext.h"
#include "nsISupportsArray.h"
#include "nsIFrame.h"
#include "nsIPresContext.h"
#include "nsIPresShell.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsIStyleFrameConstruction.h"
#include "nsLayoutAtoms.h"
#include "nsTimer.h"
#include "nsICSSStyleSheet.h"
#include "nsNetUtil.h"
#include "nsIStyleRuleSupplier.h"
#ifdef MOZ_PERF_METRICS
#include "nsITimeRecorder.h"
#define STYLESET_START_TIMER(a) \
StartTimer(a)
#define STYLESET_STOP_TIMER(a) \
StopTimer(a)
#else
#define STYLESET_START_TIMER(a) ((void)0)
#define STYLESET_STOP_TIMER(a) ((void)0)
#endif
#include "nsISizeOfHandler.h"
static NS_DEFINE_IID(kIStyleFrameConstructionIID, NS_ISTYLE_FRAME_CONSTRUCTION_IID);
// - fast cache uses a CRC32 on the style context to quickly find sharing candidates.
// Enabling it by defining USE_FAST_CACHE makes style sharing significantly faster
// but introduces more code and logic, and is thus potentially more error-prone
// - Enabled by default: disable to determine if there are problems in the fast-cache
// NOTE: make sure the define COMPUTE_STYLEDATA_CRC is ON in nsStyleContext.cpp for
// this to be affective...
#define USE_FAST_CACHE
#ifdef USE_FAST_CACHE
///////////////////////////////////////
// DEBUG defines for the fast cache:
///////////////////////////////////////
// - define DUMP_CACHE_STATS to get a dump of the cache's depth and breadth
//#define DUMP_CACHE_STATS
// - define ENABLE_FAST_CACHE_TICKLE to enable tickling of each element in the cache
// whenever the cache is accessed (to find stale pointers)
//#define ENABLE_FAST_CACHE_TICKLE
#endif //ifdef USE_FAST_CACHE
#ifdef USE_FAST_CACHE
PRBool PR_CALLBACK HashTableEnumDestroy(nsHashKey *aKey, void *aData, void* closure);
PRBool PR_CALLBACK HashTableEnumDump(nsHashKey *aKey, void *aData, void* closure);
PRBool PR_CALLBACK HashTableEnumTickle(nsHashKey *aKey, void *aData, void* closure);
class StyleContextCache
{
// friendship for the Destroy method...
friend PRBool PR_CALLBACK HashTableEnumDestroy(nsHashKey *aKey, void *aData, void* closure);
public :
StyleContextCache(void);
~StyleContextCache(void);
nsresult AddContext(scKey aKey, nsIStyleContext *aContext);
nsresult RemoveContext(scKey aKey, nsIStyleContext *aContext);
nsresult RemoveAllContexts(scKey aKey);
nsresult GetContexts(scKey aKey, nsVoidArray **aResults); // do not munge list
PRUint32 Count(void);
private:
StyleContextCache(StyleContextCache &aNoSrcAllowed); // Not Implemented
void DumpStats(void);
void Tickle(const char *msg = nsnull);
// make sure there is a list for the specified key (allocates one if necessary)
nsresult VerifyList(scKey aKey);
// returns the list for the key, may be null
nsVoidArray *GetList(scKey aKey);
// allocate / destroy the list
static nsVoidArray *AllocateList(void);
static nsresult DestroyList(nsVoidArray* aList);
nsObjectHashtable mHashTable;
PRUint32 mCount;
};
#endif /* USE_FSAT_CACHE */
class StyleSetImpl : public nsIStyleSet
#ifdef MOZ_PERF_METRICS
, public nsITimeRecorder
#endif
{
public:
StyleSetImpl();
NS_DECL_ISUPPORTS
virtual void AppendOverrideStyleSheet(nsIStyleSheet* aSheet);
virtual void InsertOverrideStyleSheetAfter(nsIStyleSheet* aSheet,
nsIStyleSheet* aAfterSheet);
virtual void InsertOverrideStyleSheetBefore(nsIStyleSheet* aSheet,
nsIStyleSheet* aBeforeSheet);
virtual void RemoveOverrideStyleSheet(nsIStyleSheet* aSheet);
virtual PRInt32 GetNumberOfOverrideStyleSheets();
virtual nsIStyleSheet* GetOverrideStyleSheetAt(PRInt32 aIndex);
virtual void AddDocStyleSheet(nsIStyleSheet* aSheet, nsIDocument* aDocument);
virtual void RemoveDocStyleSheet(nsIStyleSheet* aSheet);
virtual PRInt32 GetNumberOfDocStyleSheets();
virtual nsIStyleSheet* GetDocStyleSheetAt(PRInt32 aIndex);
virtual void AppendBackstopStyleSheet(nsIStyleSheet* aSheet);
virtual void InsertBackstopStyleSheetAfter(nsIStyleSheet* aSheet,
nsIStyleSheet* aAfterSheet);
virtual void InsertBackstopStyleSheetBefore(nsIStyleSheet* aSheet,
nsIStyleSheet* aBeforeSheet);
virtual void RemoveBackstopStyleSheet(nsIStyleSheet* aSheet);
virtual PRInt32 GetNumberOfBackstopStyleSheets();
virtual nsIStyleSheet* GetBackstopStyleSheetAt(PRInt32 aIndex);
virtual void ReplaceBackstopStyleSheets(nsISupportsArray* aNewSheets);
NS_IMETHOD EnableQuirkStyleSheet(PRBool aEnable);
NS_IMETHOD NotifyStyleSheetStateChanged(PRBool aDisabled);
virtual nsIStyleContext* ResolveStyleFor(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIStyleContext* aParentContext,
PRBool aForceUnique = PR_FALSE);
virtual nsIStyleContext* ResolvePseudoStyleFor(nsIPresContext* aPresContext,
nsIContent* aParentContent,
nsIAtom* aPseudoTag,
nsIStyleContext* aParentContext,
PRBool aForceUnique = PR_FALSE,
nsICSSPseudoComparator* aComparator = nsnull);
virtual nsIStyleContext* ProbePseudoStyleFor(nsIPresContext* aPresContext,
nsIContent* aParentContent,
nsIAtom* aPseudoTag,
nsIStyleContext* aParentContext,
PRBool aForceUnique = PR_FALSE);
NS_IMETHOD ReParentStyleContext(nsIPresContext* aPresContext,
nsIStyleContext* aStyleContext,
nsIStyleContext* aNewParentContext,
nsIStyleContext** aNewStyleContext);
NS_IMETHOD HasStateDependentStyle(nsIPresContext* aPresContext,
nsIContent* aContent);
NS_IMETHOD ConstructRootFrame(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIFrame*& aFrameSubTree);
NS_IMETHOD ReconstructDocElementHierarchy(nsIPresContext* aPresContext);
NS_IMETHOD ContentAppended(nsIPresContext* aPresContext,
nsIContent* aContainer,
PRInt32 aNewIndexInContainer);
NS_IMETHOD ContentInserted(nsIPresContext* aPresContext,
nsIContent* aContainer,
nsIContent* aChild,
PRInt32 aIndexInContainer);
NS_IMETHOD ContentReplaced(nsIPresContext* aPresContext,
nsIContent* aContainer,
nsIContent* aOldChild,
nsIContent* aNewChild,
PRInt32 aIndexInContainer);
NS_IMETHOD ContentRemoved(nsIPresContext* aPresContext,
nsIContent* aContainer,
nsIContent* aChild,
PRInt32 aIndexInContainer);
NS_IMETHOD ContentChanged(nsIPresContext* aPresContext,
nsIContent* aContent,
nsISupports* aSubContent);
NS_IMETHOD ContentStatesChanged(nsIPresContext* aPresContext,
nsIContent* aContent1,
nsIContent* aContent2);
NS_IMETHOD AttributeChanged(nsIPresContext* aPresContext,
nsIContent* aChild,
PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aHint); // See nsStyleConsts fot hint values
// xxx style rules enumeration
// Style change notifications
NS_IMETHOD StyleRuleChanged(nsIPresContext* aPresContext,
nsIStyleSheet* aStyleSheet,
nsIStyleRule* aStyleRule,
PRInt32 aHint); // See nsStyleConsts fot hint values
NS_IMETHOD StyleRuleAdded(nsIPresContext* aPresContext,
nsIStyleSheet* aStyleSheet,
nsIStyleRule* aStyleRule);
NS_IMETHOD StyleRuleRemoved(nsIPresContext* aPresContext,
nsIStyleSheet* aStyleSheet,
nsIStyleRule* aStyleRule);
// Notification that we were unable to render a replaced element.
NS_IMETHOD CantRenderReplacedElement(nsIPresContext* aPresContext,
nsIFrame* aFrame);
// Request to create a continuing frame
NS_IMETHOD CreateContinuingFrame(nsIPresContext* aPresContext,
nsIFrame* aFrame,
nsIFrame* aParentFrame,
nsIFrame** aContinuingFrame);
// Request to find the primary frame associated with a given content object.
// This is typically called by the pres shell when there is no mapping in
// the pres shell hash table
NS_IMETHOD FindPrimaryFrameFor(nsIPresContext* aPresContext,
nsIFrameManager* aFrameManager,
nsIContent* aContent,
nsIFrame** aFrame,
nsFindFrameHint* aHint);
// APIs for registering objects that can supply additional
// rules during processing.
NS_IMETHOD SetStyleRuleSupplier(nsIStyleRuleSupplier* aSupplier);
NS_IMETHOD GetStyleRuleSupplier(nsIStyleRuleSupplier** aSupplier);
virtual void List(FILE* out = stdout, PRInt32 aIndent = 0);
virtual void SizeOf(nsISizeOfHandler *aSizeofHandler, PRUint32 &aSize);
virtual void ResetUniqueStyleItems(void);
#ifdef SHARE_STYLECONTEXTS
// add and remove from the cache of all contexts
NS_IMETHOD AddStyleContext(nsIStyleContext *aNewStyleContext);
NS_IMETHOD RemoveStyleContext(nsIStyleContext *aNewStyleContext);
NS_IMETHOD FindMatchingContext(nsIStyleContext *aStyleContextToMatch,
nsIStyleContext **aMatchingContext);
#endif
#ifdef MOZ_PERF_METRICS
NS_DECL_NSITIMERECORDER
#endif
NS_IMETHOD AttributeAffectsStyle(nsIAtom *aAttribute, nsIContent *aContent,
PRBool &aAffects);
void WalkRuleProcessors(nsISupportsArrayEnumFunc aFunc, void* aData,
nsIContent* aContent);
private:
static nsrefcnt gInstances;
static nsIURI *gQuirkURI;
// These are not supported and are not implemented!
StyleSetImpl(const StyleSetImpl& aCopy);
StyleSetImpl& operator=(const StyleSetImpl& aCopy);
protected:
virtual ~StyleSetImpl();
PRBool EnsureArray(nsISupportsArray** aArray);
void RecycleArray(nsISupportsArray** aArray);
void ClearRuleProcessors(void);
void ClearOverrideRuleProcessors(void);
void ClearBackstopRuleProcessors(void);
void ClearDocRuleProcessors(void);
nsresult GatherRuleProcessors(void);
nsIStyleContext* GetContext(nsIPresContext* aPresContext, nsIStyleContext* aParentContext,
nsIAtom* aPseudoTag, nsISupportsArray* aRules, PRBool aForceUnique,
PRBool& aUsedRules);
void List(FILE* out, PRInt32 aIndent, nsISupportsArray* aSheets);
void ListContexts(nsIStyleContext* aRootContext, FILE* out, PRInt32 aIndent);
nsISupportsArray* mOverrideSheets; // most significant first
nsISupportsArray* mDocSheets; // " "
nsISupportsArray* mBackstopSheets; // " "
nsISupportsArray* mBackstopRuleProcessors; // least significant first
nsISupportsArray* mDocRuleProcessors; // " "
nsISupportsArray* mOverrideRuleProcessors; // " "
nsISupportsArray* mRecycler;
nsIStyleFrameConstruction* mFrameConstructor;
nsIStyleSheet* mQuirkStyleSheet; // cached instance for enabling/disabling
nsCOMPtr<nsIStyleRuleSupplier> mStyleRuleSupplier;
#ifdef SHARE_STYLECONTEXTS
#ifdef USE_FAST_CACHE
// a cache of all style contexts for faster searching
// when we want to find style contexts in GetContext
StyleContextCache mStyleContextCache;
#else
nsVoidArray mStyleContextCache;
#endif
#endif
MOZ_TIMER_DECLARE(mStyleResolutionWatch)
#ifdef MOZ_PERF_METRICS
PRBool mTimerEnabled; // true if timing is enabled, false if disabled
#endif
};
nsrefcnt StyleSetImpl::gInstances = 0;
nsIURI *StyleSetImpl::gQuirkURI = 0;
StyleSetImpl::StyleSetImpl()
: mOverrideSheets(nsnull),
mDocSheets(nsnull),
mBackstopSheets(nsnull),
mBackstopRuleProcessors(nsnull),
mDocRuleProcessors(nsnull),
mOverrideRuleProcessors(nsnull),
mRecycler(nsnull),
mFrameConstructor(nsnull),
mQuirkStyleSheet(nsnull),
mStyleRuleSupplier(nsnull)
#ifdef SHARE_STYLECONTEXTS
#ifdef USE_FAST_CACHE
,mStyleContextCache()
#else
,mStyleContextCache(0)
#endif // USE_FAST_CACHE
#endif
#ifdef MOZ_PERF_METRICS
,mTimerEnabled(PR_FALSE)
#endif
{
NS_INIT_REFCNT();
if (gInstances++ == 0)
{
const char kQuirk_href[] = "resource:/res/quirk.css";
NS_NewURI (&gQuirkURI, kQuirk_href);
NS_ASSERTION (gQuirkURI != 0, "Cannot allocate nsStyleSetImpl::gQuirkURI");
}
}
StyleSetImpl::~StyleSetImpl()
{
NS_IF_RELEASE(mOverrideSheets);
NS_IF_RELEASE(mDocSheets);
NS_IF_RELEASE(mBackstopSheets);
NS_IF_RELEASE(mBackstopRuleProcessors);
NS_IF_RELEASE(mDocRuleProcessors);
NS_IF_RELEASE(mOverrideRuleProcessors);
NS_IF_RELEASE(mFrameConstructor);
NS_IF_RELEASE(mRecycler);
NS_IF_RELEASE(mQuirkStyleSheet);
#ifdef SHARE_STYLECONTEXTS
#ifdef DEBUG
NS_ASSERTION( mStyleContextCache.Count() == 0, "StyleContextCache is not empty in StyleSet destructor: style contexts are being leaked");
if (mStyleContextCache.Count() > 0) {
printf("*** Leaking %d style context instances (reported by the StyleContextCache) ***\n", mStyleContextCache.Count());
}
#endif
#endif
if (--gInstances == 0)
{
NS_IF_RELEASE (gQuirkURI);
}
}
#ifndef MOZ_PERF_METRICS
NS_IMPL_ISUPPORTS(StyleSetImpl, NS_GET_IID(nsIStyleSet))
#else
NS_IMPL_ISUPPORTS2(StyleSetImpl, nsIStyleSet, nsITimeRecorder)
#endif
PRBool StyleSetImpl::EnsureArray(nsISupportsArray** aArray)
{
if (nsnull == *aArray) {
(*aArray) = mRecycler;
mRecycler = nsnull;
if (nsnull == *aArray) {
if (NS_OK != NS_NewISupportsArray(aArray)) {
return PR_FALSE;
}
}
}
return PR_TRUE;
}
void
StyleSetImpl::RecycleArray(nsISupportsArray** aArray)
{
if (! mRecycler) {
mRecycler = *aArray; // take ref
mRecycler->Clear();
*aArray = nsnull;
}
else { // already have a recycled array
NS_RELEASE(*aArray);
}
}
void
StyleSetImpl::ClearRuleProcessors(void)
{
ClearBackstopRuleProcessors();
ClearDocRuleProcessors();
ClearOverrideRuleProcessors();
}
void
StyleSetImpl::ClearBackstopRuleProcessors(void)
{
if (mBackstopRuleProcessors)
RecycleArray(&mBackstopRuleProcessors);
}
void
StyleSetImpl::ClearDocRuleProcessors(void)
{
if (mDocRuleProcessors)
RecycleArray(&mDocRuleProcessors);
}
void
StyleSetImpl::ClearOverrideRuleProcessors(void)
{
if (mOverrideRuleProcessors)
RecycleArray(&mOverrideRuleProcessors);
}
struct RuleProcessorData {
RuleProcessorData(nsISupportsArray* aRuleProcessors)
: mRuleProcessors(aRuleProcessors),
mPrevProcessor(nsnull)
{}
nsISupportsArray* mRuleProcessors;
nsIStyleRuleProcessor* mPrevProcessor;
};
static PRBool
EnumRuleProcessor(nsISupports* aSheet, void* aData)
{
nsIStyleSheet* sheet = (nsIStyleSheet*)aSheet;
RuleProcessorData* data = (RuleProcessorData*)aData;
nsIStyleRuleProcessor* processor = nsnull;
nsresult result = sheet->GetStyleRuleProcessor(processor, data->mPrevProcessor);
if (NS_SUCCEEDED(result) && processor) {
if (processor != data->mPrevProcessor) {
data->mRuleProcessors->AppendElement(processor);
data->mPrevProcessor = processor; // ref is held by array
}
NS_RELEASE(processor);
}
return PR_TRUE;
}
nsresult
StyleSetImpl::GatherRuleProcessors(void)
{
nsresult result = NS_ERROR_OUT_OF_MEMORY;
if (mBackstopSheets && !mBackstopRuleProcessors) {
if (EnsureArray(&mBackstopRuleProcessors)) {
RuleProcessorData data(mBackstopRuleProcessors);
mBackstopSheets->EnumerateBackwards(EnumRuleProcessor, &data);
PRUint32 count;
mBackstopRuleProcessors->Count(&count);
if (0 == count) {
RecycleArray(&mBackstopRuleProcessors);
}
} else return result;
}
if (mDocSheets && !mDocRuleProcessors) {
if (EnsureArray(&mDocRuleProcessors)) {
RuleProcessorData data(mDocRuleProcessors);
mDocSheets->EnumerateBackwards(EnumRuleProcessor, &data);
PRUint32 count;
mDocRuleProcessors->Count(&count);
if (0 == count) {
RecycleArray(&mDocRuleProcessors);
}
} else return result;
}
if (mOverrideSheets && !mOverrideRuleProcessors) {
if (EnsureArray(&mOverrideRuleProcessors)) {
RuleProcessorData data(mOverrideRuleProcessors);
mOverrideSheets->EnumerateBackwards(EnumRuleProcessor, &data);
PRUint32 count;
mOverrideRuleProcessors->Count(&count);
if (0 == count) {
RecycleArray(&mOverrideRuleProcessors);
}
} else return result;
}
return NS_OK;
}
// ----- Override sheets
void StyleSetImpl::AppendOverrideStyleSheet(nsIStyleSheet* aSheet)
{
NS_PRECONDITION(nsnull != aSheet, "null arg");
if (EnsureArray(&mOverrideSheets)) {
mOverrideSheets->RemoveElement(aSheet);
mOverrideSheets->AppendElement(aSheet);
ClearOverrideRuleProcessors();
}
}
void StyleSetImpl::InsertOverrideStyleSheetAfter(nsIStyleSheet* aSheet,
nsIStyleSheet* aAfterSheet)
{
NS_PRECONDITION(nsnull != aSheet, "null arg");
if (EnsureArray(&mOverrideSheets)) {
mOverrideSheets->RemoveElement(aSheet);
PRInt32 index = mOverrideSheets->IndexOf(aAfterSheet);
mOverrideSheets->InsertElementAt(aSheet, ++index);
ClearOverrideRuleProcessors();
}
}
void StyleSetImpl::InsertOverrideStyleSheetBefore(nsIStyleSheet* aSheet,
nsIStyleSheet* aBeforeSheet)
{
NS_PRECONDITION(nsnull != aSheet, "null arg");
if (EnsureArray(&mOverrideSheets)) {
mOverrideSheets->RemoveElement(aSheet);
PRInt32 index = mOverrideSheets->IndexOf(aBeforeSheet);
mOverrideSheets->InsertElementAt(aSheet, ((-1 < index) ? index : 0));
ClearOverrideRuleProcessors();
}
}
void StyleSetImpl::RemoveOverrideStyleSheet(nsIStyleSheet* aSheet)
{
NS_PRECONDITION(nsnull != aSheet, "null arg");
if (nsnull != mOverrideSheets) {
mOverrideSheets->RemoveElement(aSheet);
ClearOverrideRuleProcessors();
}
}
PRInt32 StyleSetImpl::GetNumberOfOverrideStyleSheets()
{
if (nsnull != mOverrideSheets) {
PRUint32 cnt;
nsresult rv = mOverrideSheets->Count(&cnt);
if (NS_FAILED(rv)) return 0; // XXX error?
return cnt;
}
return 0;
}
nsIStyleSheet* StyleSetImpl::GetOverrideStyleSheetAt(PRInt32 aIndex)
{
nsIStyleSheet* sheet = nsnull;
if (nsnull != mOverrideSheets) {
sheet = (nsIStyleSheet*)mOverrideSheets->ElementAt(aIndex);
}
return sheet;
}
// -------- Doc Sheets
void StyleSetImpl::AddDocStyleSheet(nsIStyleSheet* aSheet, nsIDocument* aDocument)
{
NS_PRECONDITION((nsnull != aSheet) && (nsnull != aDocument), "null arg");
if (EnsureArray(&mDocSheets)) {
mDocSheets->RemoveElement(aSheet);
// lowest index last
PRInt32 newDocIndex = aDocument->GetIndexOfStyleSheet(aSheet);
PRUint32 count;
nsresult rv = mDocSheets->Count(&count);
if (NS_FAILED(rv)) return; // XXX error?
PRUint32 index;
for (index = 0; index < count; index++) {
nsIStyleSheet* sheet = (nsIStyleSheet*)mDocSheets->ElementAt(index);
PRInt32 sheetDocIndex = aDocument->GetIndexOfStyleSheet(sheet);
if (sheetDocIndex < newDocIndex) {
mDocSheets->InsertElementAt(aSheet, index);
index = count; // break loop
}
NS_RELEASE(sheet);
}
PRUint32 cnt;
rv = mDocSheets->Count(&cnt);
if (NS_FAILED(rv)) return; // XXX error?
if (cnt == count) { // didn't insert it
mDocSheets->AppendElement(aSheet);
}
if (nsnull == mFrameConstructor) {
aSheet->QueryInterface(kIStyleFrameConstructionIID, (void **)&mFrameConstructor);
}
ClearDocRuleProcessors();
}
}
void StyleSetImpl::RemoveDocStyleSheet(nsIStyleSheet* aSheet)
{
NS_PRECONDITION(nsnull != aSheet, "null arg");
if (nsnull != mDocSheets) {
mDocSheets->RemoveElement(aSheet);
ClearDocRuleProcessors();
}
}
PRInt32 StyleSetImpl::GetNumberOfDocStyleSheets()
{
if (nsnull != mDocSheets) {
PRUint32 cnt;
nsresult rv = mDocSheets->Count(&cnt);
if (NS_FAILED(rv)) return 0; // XXX error?
return cnt;
}
return 0;
}
nsIStyleSheet* StyleSetImpl::GetDocStyleSheetAt(PRInt32 aIndex)
{
nsIStyleSheet* sheet = nsnull;
if (nsnull != mDocSheets) {
sheet = (nsIStyleSheet*)mDocSheets->ElementAt(aIndex);
}
return sheet;
}
// ------ backstop sheets
void StyleSetImpl::AppendBackstopStyleSheet(nsIStyleSheet* aSheet)
{
NS_PRECONDITION(nsnull != aSheet, "null arg");
if (EnsureArray(&mBackstopSheets)) {
mBackstopSheets->RemoveElement(aSheet);
mBackstopSheets->AppendElement(aSheet);
ClearBackstopRuleProcessors();
}
}
void StyleSetImpl::InsertBackstopStyleSheetAfter(nsIStyleSheet* aSheet,
nsIStyleSheet* aAfterSheet)
{
NS_PRECONDITION(nsnull != aSheet, "null arg");
if (EnsureArray(&mBackstopSheets)) {
mBackstopSheets->RemoveElement(aSheet);
PRInt32 index = mBackstopSheets->IndexOf(aAfterSheet);
mBackstopSheets->InsertElementAt(aSheet, ++index);
ClearBackstopRuleProcessors();
}
}
void StyleSetImpl::InsertBackstopStyleSheetBefore(nsIStyleSheet* aSheet,
nsIStyleSheet* aBeforeSheet)
{
NS_PRECONDITION(nsnull != aSheet, "null arg");
if (EnsureArray(&mBackstopSheets)) {
mBackstopSheets->RemoveElement(aSheet);
PRInt32 index = mBackstopSheets->IndexOf(aBeforeSheet);
mBackstopSheets->InsertElementAt(aSheet, ((-1 < index) ? index : 0));
ClearBackstopRuleProcessors();
}
}
void StyleSetImpl::RemoveBackstopStyleSheet(nsIStyleSheet* aSheet)
{
NS_PRECONDITION(nsnull != aSheet, "null arg");
if (nsnull != mBackstopSheets) {
mBackstopSheets->RemoveElement(aSheet);
ClearBackstopRuleProcessors();
}
}
PRInt32 StyleSetImpl::GetNumberOfBackstopStyleSheets()
{
if (nsnull != mBackstopSheets) {
PRUint32 cnt;
nsresult rv = mBackstopSheets->Count(&cnt);
if (NS_FAILED(rv)) return 0; // XXX error?
return cnt;
}
return 0;
}
NS_IMETHODIMP StyleSetImpl::EnableQuirkStyleSheet(PRBool aEnable)
{
nsresult rv = NS_OK;
if (nsnull == mQuirkStyleSheet) {
// first find the quirk sheet:
// - run through all of the backstop sheets and check for a CSSStyleSheet that
// has the URL we want
PRUint32 i, nSheets = GetNumberOfBackstopStyleSheets();
for (i=0; i< nSheets; i++) {
nsCOMPtr<nsIStyleSheet> sheet;
sheet = getter_AddRefs(GetBackstopStyleSheetAt(i));
if (sheet) {
nsCOMPtr<nsICSSStyleSheet> cssSheet;
sheet->QueryInterface(NS_GET_IID(nsICSSStyleSheet), getter_AddRefs(cssSheet));
if (cssSheet) {
nsCOMPtr<nsIStyleSheet> quirkSheet;
PRBool bHasSheet = PR_FALSE;
NS_ASSERTION(gQuirkURI != nsnull, "StyleSetImpl::gQuirkStyleSet is not initialized!");
if (gQuirkURI != nsnull
&& NS_SUCCEEDED(cssSheet->ContainsStyleSheet(gQuirkURI, bHasSheet,
getter_AddRefs(quirkSheet)))
&& bHasSheet) {
NS_ASSERTION(quirkSheet, "QuirkSheet must be set: ContainsStyleSheet is hosed");
// cache the sheet for faster lookup next time
mQuirkStyleSheet = quirkSheet.get();
// addref for our cached reference
NS_ADDREF(mQuirkStyleSheet);
}
}
}
}
}
if (mQuirkStyleSheet) {
#ifdef DEBUG
printf( "%s Quirk StyleSheet\n", aEnable ? "Enabling" : "Disabling" );
#endif
mQuirkStyleSheet->SetEnabled(aEnable);
}
return rv;
}
NS_IMETHODIMP
StyleSetImpl::NotifyStyleSheetStateChanged(PRBool aDisabled)
{
ClearRuleProcessors();
GatherRuleProcessors();
return NS_OK;
}
nsIStyleSheet* StyleSetImpl::GetBackstopStyleSheetAt(PRInt32 aIndex)
{
nsIStyleSheet* sheet = nsnull;
if (nsnull != mBackstopSheets) {
sheet = (nsIStyleSheet*)mBackstopSheets->ElementAt(aIndex);
}
return sheet;
}
void
StyleSetImpl::ReplaceBackstopStyleSheets(nsISupportsArray* aNewBackstopSheets)
{
ClearBackstopRuleProcessors();
NS_IF_RELEASE(mBackstopSheets);
mBackstopSheets = aNewBackstopSheets;
NS_IF_ADDREF(mBackstopSheets);
}
struct RulesMatchingData {
RulesMatchingData(nsIPresContext* aPresContext,
nsIAtom* aMedium,
nsIContent* aContent,
nsIStyleContext* aParentContext,
nsISupportsArray* aResults)
: mPresContext(aPresContext),
mMedium(aMedium),
mContent(aContent),
mParentContext(aParentContext),
mResults(aResults)
{
}
nsIPresContext* mPresContext;
nsIAtom* mMedium;
nsIContent* mContent;
nsIStyleContext* mParentContext;
nsISupportsArray* mResults;
};
static PRBool
EnumRulesMatching(nsISupports* aProcessor, void* aData)
{
nsIStyleRuleProcessor* processor = (nsIStyleRuleProcessor*)aProcessor;
RulesMatchingData* data = (RulesMatchingData*)aData;
processor->RulesMatching(data->mPresContext, data->mMedium, data->mContent,
data->mParentContext, data->mResults);
return PR_TRUE;
}
#ifdef SHARE_STYLECONTEXTS
#ifdef NOISY_DEBUG
static int gNewCount=0;
static int gSharedCount=0;
#endif
#endif
nsIStyleContext* StyleSetImpl::GetContext(nsIPresContext* aPresContext,
nsIStyleContext* aParentContext, nsIAtom* aPseudoTag,
nsISupportsArray* aRules,
PRBool aForceUnique, PRBool& aUsedRules)
{
nsIStyleContext* result = nsnull;
aUsedRules = PR_FALSE;
if ((PR_FALSE == aForceUnique) && (nsnull != aParentContext)) {
aParentContext->FindChildWithRules(aPseudoTag, aRules, result);
}
if (nsnull == result) {
if (NS_SUCCEEDED(NS_NewStyleContext(&result, aParentContext, aPseudoTag, aRules, aPresContext))) {
if (PR_TRUE == aForceUnique) {
result->ForceUnique();
}
aUsedRules = PRBool(nsnull != aRules);
}
#ifdef NOISY_DEBUG
fprintf(stdout, "+++ NewSC %d +++\n", ++gNewCount);
#endif
}
#ifdef NOISY_DEBUG
else {
fprintf(stdout, "--- SharedSC %d ---\n", ++gSharedCount);
}
#endif
return result;
}
// XXX for now only works for strength 0 & 1
static void SortRulesByStrength(nsISupportsArray* aRules)
{
PRUint32 cnt;
nsresult rv = aRules->Count(&cnt);
if (NS_FAILED(rv)) return; // XXX error?
PRInt32 count = (PRInt32)cnt;
if (1 < count) {
PRInt32 index;
PRInt32 strength;
for (index = 0; index < count; ) {
nsIStyleRule* rule = (nsIStyleRule*)aRules->ElementAt(index);
rule->GetStrength(strength);
if (0 < strength) {
aRules->RemoveElementAt(index);
aRules->AppendElement(rule);
count--;
}
else {
index++;
}
NS_RELEASE(rule);
}
}
}
#ifdef NS_DEBUG
#define NS_ASSERT_REFCOUNT(ptr,cnt,msg) { \
nsrefcnt count = ptr->AddRef(); \
ptr->Release(); \
NS_ASSERTION(--count == cnt, msg); \
}
#else
#define NS_ASSERT_REFCOUNT(ptr,cnt,msg) {}
#endif
nsIStyleContext* StyleSetImpl::ResolveStyleFor(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIStyleContext* aParentContext,
PRBool aForceUnique)
{
MOZ_TIMER_DEBUGLOG(("Start: StyleSetImpl::ResolveStyleFor(), this=%p\n", this));
STYLESET_START_TIMER(NS_TIMER_STYLE_RESOLUTION);
nsIStyleContext* result = nsnull;
NS_ASSERTION(aContent, "must have content");
NS_ASSERTION(aPresContext, "must have pres context");
if (aContent && aPresContext) {
GatherRuleProcessors();
if (mBackstopRuleProcessors || mDocRuleProcessors || mOverrideRuleProcessors) {
nsISupportsArray* rules = nsnull;
if (EnsureArray(&rules)) {
nsIAtom* medium = nsnull;
aPresContext->GetMedium(&medium);
RulesMatchingData data(aPresContext, medium, aContent, aParentContext, rules);
WalkRuleProcessors(EnumRulesMatching, &data, aContent);
PRBool usedRules = PR_FALSE;
PRUint32 ruleCount = 0;
rules->Count(&ruleCount);
if (0 < ruleCount) {
SortRulesByStrength(rules);
result = GetContext(aPresContext, aParentContext, nsnull, rules, aForceUnique, usedRules);
if (usedRules) {
NS_ASSERT_REFCOUNT(rules, 2, "rules array was used elsewhere");
NS_RELEASE(rules);
}
else {
NS_ASSERT_REFCOUNT(rules, 1, "rules array was used elsewhere");
RecycleArray(&rules);
}
}
else {
NS_ASSERT_REFCOUNT(rules, 1, "rules array was used elsewhere");
RecycleArray(&rules);
result = GetContext(aPresContext, aParentContext, nsnull, nsnull, aForceUnique, usedRules);
}
NS_RELEASE(medium);
}
}
}
MOZ_TIMER_DEBUGLOG(("Stop: StyleSetImpl::ResolveStyleFor(), this=%p\n", this));
STYLESET_STOP_TIMER(NS_TIMER_STYLE_RESOLUTION);
return result;
}
struct PseudoRulesMatchingData {
PseudoRulesMatchingData(nsIPresContext* aPresContext,
nsIAtom* aMedium,
nsIContent* aParentContent,
nsIAtom* aPseudoTag,
nsIStyleContext* aParentContext,
nsICSSPseudoComparator* aComparator,
nsISupportsArray* aResults)
: mPresContext(aPresContext),
mMedium(aMedium),
mParentContent(aParentContent),
mPseudoTag(aPseudoTag),
mParentContext(aParentContext),
mComparator(aComparator),
mResults(aResults)
{
}
nsIPresContext* mPresContext;
nsIAtom* mMedium;
nsIContent* mParentContent;
nsIAtom* mPseudoTag;
nsIStyleContext* mParentContext;
nsICSSPseudoComparator* mComparator;
nsISupportsArray* mResults;
};
static PRBool
EnumPseudoRulesMatching(nsISupports* aProcessor, void* aData)
{
nsIStyleRuleProcessor* processor = (nsIStyleRuleProcessor*)aProcessor;
PseudoRulesMatchingData* data = (PseudoRulesMatchingData*)aData;
processor->RulesMatching(data->mPresContext, data->mMedium,
data->mParentContent, data->mPseudoTag,
data->mParentContext, data->mComparator, data->mResults);
return PR_TRUE;
}
nsIStyleContext* StyleSetImpl::ResolvePseudoStyleFor(nsIPresContext* aPresContext,
nsIContent* aParentContent,
nsIAtom* aPseudoTag,
nsIStyleContext* aParentContext,
PRBool aForceUnique,
nsICSSPseudoComparator* aComparator)
{
MOZ_TIMER_DEBUGLOG(("Start: StyleSetImpl::ResolvePseudoStyleFor(), this=%p\n", this));
STYLESET_START_TIMER(NS_TIMER_STYLE_RESOLUTION);
nsIStyleContext* result = nsnull;
NS_ASSERTION(aPseudoTag, "must have pseudo tag");
NS_ASSERTION(aPresContext, "must have pres context");
if (aPseudoTag && aPresContext) {
GatherRuleProcessors();
if (mBackstopRuleProcessors || mDocRuleProcessors || mOverrideRuleProcessors) {
nsISupportsArray* rules = nsnull;
if (EnsureArray(&rules)) {
nsIAtom* medium = nsnull;
aPresContext->GetMedium(&medium);
PseudoRulesMatchingData data(aPresContext, medium, aParentContent,
aPseudoTag, aParentContext, aComparator, rules);
WalkRuleProcessors(EnumPseudoRulesMatching, &data, aParentContent);
PRBool usedRules = PR_FALSE;
PRUint32 ruleCount = 0;
rules->Count(&ruleCount);
if (0 < ruleCount) {
SortRulesByStrength(rules);
result = GetContext(aPresContext, aParentContext, aPseudoTag, rules, aForceUnique, usedRules);
if (usedRules) {
NS_ASSERT_REFCOUNT(rules, 2, "rules array was used elsewhere");
NS_RELEASE(rules);
}
else {
NS_ASSERT_REFCOUNT(rules, 1, "rules array was used elsewhere");
rules->Clear();
RecycleArray(&rules);
}
}
else {
NS_ASSERT_REFCOUNT(rules, 1, "rules array was used elsewhere");
RecycleArray(&rules);
result = GetContext(aPresContext, aParentContext, aPseudoTag, nsnull, aForceUnique, usedRules);
}
NS_IF_RELEASE(medium);
}
}
}
MOZ_TIMER_DEBUGLOG(("Stop: StyleSetImpl::ResolvePseudoStyleFor(), this=%p\n", this));
STYLESET_STOP_TIMER(NS_TIMER_STYLE_RESOLUTION);
return result;
}
nsIStyleContext* StyleSetImpl::ProbePseudoStyleFor(nsIPresContext* aPresContext,
nsIContent* aParentContent,
nsIAtom* aPseudoTag,
nsIStyleContext* aParentContext,
PRBool aForceUnique)
{
MOZ_TIMER_DEBUGLOG(("Start: StyleSetImpl::ProbePseudoStyleFor(), this=%p\n", this));
STYLESET_START_TIMER(NS_TIMER_STYLE_RESOLUTION);
nsIStyleContext* result = nsnull;
NS_ASSERTION(aPseudoTag, "must have pseudo tag");
NS_ASSERTION(aPresContext, "must have pres context");
if (aPseudoTag && aPresContext) {
GatherRuleProcessors();
if (mBackstopRuleProcessors || mDocRuleProcessors || mOverrideRuleProcessors) {
nsISupportsArray* rules = nsnull;
if (EnsureArray(&rules)) {
nsIAtom* medium = nsnull;
aPresContext->GetMedium(&medium);
PseudoRulesMatchingData data(aPresContext, medium, aParentContent,
aPseudoTag, aParentContext, nsnull, rules);
WalkRuleProcessors(EnumPseudoRulesMatching, &data, aParentContent);
PRBool usedRules = PR_FALSE;
PRUint32 ruleCount;
rules->Count(&ruleCount);
if (0 < ruleCount) {
SortRulesByStrength(rules);
result = GetContext(aPresContext, aParentContext, aPseudoTag, rules, aForceUnique, usedRules);
if (usedRules) {
NS_ASSERT_REFCOUNT(rules, 2, "rules array was used elsewhere");
NS_RELEASE(rules);
}
else {
NS_ASSERT_REFCOUNT(rules, 1, "rules array was used elsewhere");
rules->Clear();
RecycleArray(&rules);
}
}
else {
NS_ASSERT_REFCOUNT(rules, 1, "rules array was used elsewhere");
RecycleArray(&rules);
}
NS_IF_RELEASE(medium);
}
}
}
MOZ_TIMER_DEBUGLOG(("Stop: StyleSetImpl::ProbePseudoStyleFor(), this=%p\n", this));
STYLESET_STOP_TIMER(NS_TIMER_STYLE_RESOLUTION);
return result;
}
NS_IMETHODIMP
StyleSetImpl::ReParentStyleContext(nsIPresContext* aPresContext,
nsIStyleContext* aStyleContext,
nsIStyleContext* aNewParentContext,
nsIStyleContext** aNewStyleContext)
{
NS_ASSERTION(aPresContext, "must have pres context");
NS_ASSERTION(aStyleContext, "must have style context");
NS_ASSERTION(aNewStyleContext, "must have new style context");
nsresult result = NS_ERROR_NULL_POINTER;
if (aPresContext && aStyleContext && aNewStyleContext) {
nsIStyleContext* oldParent = aStyleContext->GetParent();
if (oldParent == aNewParentContext) {
result = NS_OK;
NS_ADDREF(aStyleContext); // for return
*aNewStyleContext = aStyleContext;
}
else { // really a new parent
nsIStyleContext* newChild = nsnull;
nsIAtom* pseudoTag = nsnull;
aStyleContext->GetPseudoType(pseudoTag);
nsISupportsArray* rules = aStyleContext->GetStyleRules();
if (aNewParentContext) {
result = aNewParentContext->FindChildWithRules(pseudoTag, rules, newChild);
}
if (newChild) { // new parent already has one
*aNewStyleContext = newChild;
}
else { // need to make one in the new parent
nsISupportsArray* newRules = nsnull;
if (rules) {
if (EnsureArray(&newRules)) {
newRules->AppendElements(rules);
}
}
result = NS_NewStyleContext(aNewStyleContext, aNewParentContext, pseudoTag,
newRules, aPresContext);
NS_IF_RELEASE(newRules);
}
NS_IF_RELEASE(rules);
NS_IF_RELEASE(pseudoTag);
}
NS_IF_RELEASE(oldParent);
}
return result;
}
struct StatefulData {
StatefulData(nsIPresContext* aPresContext, nsIAtom* aMedium, nsIContent* aContent)
: mPresContext(aPresContext),
mMedium(aMedium),
mContent(aContent),
mStateful(PR_FALSE)
{}
nsIPresContext* mPresContext;
nsIAtom* mMedium;
nsIContent* mContent;
PRBool mStateful;
};
static PRBool SheetHasStatefulStyle(nsISupports* aProcessor, void *aData)
{
nsIStyleRuleProcessor* processor = (nsIStyleRuleProcessor*)aProcessor;
StatefulData* data = (StatefulData*)aData;
if (NS_OK == processor->HasStateDependentStyle(data->mPresContext, data->mMedium,
data->mContent)) {
data->mStateful = PR_TRUE;
return PR_FALSE; // stop iteration
}
return PR_TRUE; // continue
}
// Test if style is dependent on content state
NS_IMETHODIMP
StyleSetImpl::HasStateDependentStyle(nsIPresContext* aPresContext,
nsIContent* aContent)
{
GatherRuleProcessors();
if (mBackstopRuleProcessors || mDocRuleProcessors || mOverrideRuleProcessors) {
nsIAtom* medium = nsnull;
aPresContext->GetMedium(&medium);
StatefulData data(aPresContext, medium, aContent);
WalkRuleProcessors(SheetHasStatefulStyle, &data, aContent);
NS_IF_RELEASE(medium);
return ((data.mStateful) ? NS_OK : NS_COMFALSE);
}
return NS_COMFALSE;
}
NS_IMETHODIMP StyleSetImpl::ConstructRootFrame(nsIPresContext* aPresContext,
nsIContent* aDocElement,
nsIFrame*& aFrameSubTree)
{
nsCOMPtr<nsIPresShell> shell;
aPresContext->GetShell(getter_AddRefs(shell));
return mFrameConstructor->ConstructRootFrame(shell, aPresContext, aDocElement,
aFrameSubTree);
}
NS_IMETHODIMP
StyleSetImpl::ReconstructDocElementHierarchy(nsIPresContext* aPresContext)
{
return mFrameConstructor->ReconstructDocElementHierarchy(aPresContext);
}
NS_IMETHODIMP StyleSetImpl::ContentAppended(nsIPresContext* aPresContext,
nsIContent* aContainer,
PRInt32 aNewIndexInContainer)
{
return mFrameConstructor->ContentAppended(aPresContext,
aContainer, aNewIndexInContainer);
}
NS_IMETHODIMP StyleSetImpl::ContentInserted(nsIPresContext* aPresContext,
nsIContent* aContainer,
nsIContent* aChild,
PRInt32 aIndexInContainer)
{
return mFrameConstructor->ContentInserted(aPresContext, aContainer,
aChild, aIndexInContainer, nsnull);
}
NS_IMETHODIMP StyleSetImpl::ContentReplaced(nsIPresContext* aPresContext,
nsIContent* aContainer,
nsIContent* aOldChild,
nsIContent* aNewChild,
PRInt32 aIndexInContainer)
{
return mFrameConstructor->ContentReplaced(aPresContext, aContainer,
aOldChild, aNewChild, aIndexInContainer);
}
NS_IMETHODIMP StyleSetImpl::ContentRemoved(nsIPresContext* aPresContext,
nsIContent* aContainer,
nsIContent* aChild,
PRInt32 aIndexInContainer)
{
return mFrameConstructor->ContentRemoved(aPresContext, aContainer,
aChild, aIndexInContainer);
}
NS_IMETHODIMP
StyleSetImpl::ContentChanged(nsIPresContext* aPresContext,
nsIContent* aContent,
nsISupports* aSubContent)
{
return mFrameConstructor->ContentChanged(aPresContext,
aContent, aSubContent);
}
NS_IMETHODIMP
StyleSetImpl::ContentStatesChanged(nsIPresContext* aPresContext,
nsIContent* aContent1,
nsIContent* aContent2)
{
return mFrameConstructor->ContentStatesChanged(aPresContext, aContent1, aContent2);
}
NS_IMETHODIMP
StyleSetImpl::AttributeChanged(nsIPresContext* aPresContext,
nsIContent* aContent,
PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aHint)
{
return mFrameConstructor->AttributeChanged(aPresContext, aContent,
aNameSpaceID, aAttribute, aHint);
}
// Style change notifications
NS_IMETHODIMP
StyleSetImpl::StyleRuleChanged(nsIPresContext* aPresContext,
nsIStyleSheet* aStyleSheet,
nsIStyleRule* aStyleRule,
PRInt32 aHint)
{
return mFrameConstructor->StyleRuleChanged(aPresContext, aStyleSheet, aStyleRule, aHint);
}
NS_IMETHODIMP
StyleSetImpl::StyleRuleAdded(nsIPresContext* aPresContext,
nsIStyleSheet* aStyleSheet,
nsIStyleRule* aStyleRule)
{
return mFrameConstructor->StyleRuleAdded(aPresContext, aStyleSheet, aStyleRule);
}
NS_IMETHODIMP
StyleSetImpl::StyleRuleRemoved(nsIPresContext* aPresContext,
nsIStyleSheet* aStyleSheet,
nsIStyleRule* aStyleRule)
{
return mFrameConstructor->StyleRuleRemoved(aPresContext, aStyleSheet, aStyleRule);
}
NS_IMETHODIMP
StyleSetImpl::CantRenderReplacedElement(nsIPresContext* aPresContext,
nsIFrame* aFrame)
{
nsCOMPtr<nsIPresShell> shell;
aPresContext->GetShell(getter_AddRefs(shell));
return mFrameConstructor->CantRenderReplacedElement(shell, aPresContext, aFrame);
}
NS_IMETHODIMP
StyleSetImpl::CreateContinuingFrame(nsIPresContext* aPresContext,
nsIFrame* aFrame,
nsIFrame* aParentFrame,
nsIFrame** aContinuingFrame)
{
nsCOMPtr<nsIPresShell> shell;
aPresContext->GetShell(getter_AddRefs(shell));
return mFrameConstructor->CreateContinuingFrame(shell, aPresContext, aFrame, aParentFrame,
aContinuingFrame);
}
// Request to find the primary frame associated with a given content object.
// This is typically called by the pres shell when there is no mapping in
// the pres shell hash table
NS_IMETHODIMP
StyleSetImpl::FindPrimaryFrameFor(nsIPresContext* aPresContext,
nsIFrameManager* aFrameManager,
nsIContent* aContent,
nsIFrame** aFrame,
nsFindFrameHint* aHint)
{
return mFrameConstructor->FindPrimaryFrameFor(aPresContext, aFrameManager,
aContent, aFrame, aHint);
}
void StyleSetImpl::List(FILE* out, PRInt32 aIndent, nsISupportsArray* aSheets)
{
PRUint32 cnt = 0;
if (aSheets) {
nsresult rv = aSheets->Count(&cnt);
if (NS_FAILED(rv)) return; // XXX error?
}
for (PRInt32 index = 0; index < (PRInt32)cnt; index++) {
nsIStyleSheet* sheet = (nsIStyleSheet*)aSheets->ElementAt(index);
sheet->List(out, aIndent);
fputs("\n", out);
NS_RELEASE(sheet);
}
}
// APIs for registering objects that can supply additional
// rules during processing.
NS_IMETHODIMP
StyleSetImpl::SetStyleRuleSupplier(nsIStyleRuleSupplier* aSupplier)
{
mStyleRuleSupplier = aSupplier;
return NS_OK;
}
NS_IMETHODIMP
StyleSetImpl::GetStyleRuleSupplier(nsIStyleRuleSupplier** aSupplier)
{
*aSupplier = mStyleRuleSupplier;
NS_IF_ADDREF(*aSupplier);
return NS_OK;
}
void StyleSetImpl::List(FILE* out, PRInt32 aIndent)
{
// List(out, aIndent, mOverrideSheets);
List(out, aIndent, mDocSheets);
// List(out, aIndent, mBackstopSheets);
}
void StyleSetImpl::ListContexts(nsIStyleContext* aRootContext, FILE* out, PRInt32 aIndent)
{
aRootContext->List(out, aIndent);
}
NS_LAYOUT nsresult
NS_NewStyleSet(nsIStyleSet** aInstancePtrResult)
{
if (aInstancePtrResult == nsnull) {
return NS_ERROR_NULL_POINTER;
}
StyleSetImpl *it = new StyleSetImpl();
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
return it->QueryInterface(NS_GET_IID(nsIStyleSet), (void **) aInstancePtrResult);
}
// nsITimeRecorder implementation
#ifdef MOZ_PERF_METRICS
NS_IMETHODIMP
StyleSetImpl::EnableTimer(PRUint32 aTimerID)
{
nsresult rv = NS_OK;
if (NS_TIMER_STYLE_RESOLUTION == aTimerID) {
mTimerEnabled = PR_TRUE;
}
else
rv = NS_ERROR_NOT_IMPLEMENTED;
return rv;
}
NS_IMETHODIMP
StyleSetImpl::DisableTimer(PRUint32 aTimerID)
{
nsresult rv = NS_OK;
if (NS_TIMER_STYLE_RESOLUTION == aTimerID) {
mTimerEnabled = PR_FALSE;
}
else
rv = NS_ERROR_NOT_IMPLEMENTED;
return rv;
}
NS_IMETHODIMP
StyleSetImpl::IsTimerEnabled(PRBool *aIsEnabled, PRUint32 aTimerID)
{
NS_ASSERTION(aIsEnabled != nsnull, "aIsEnabled paramter cannot be null" );
nsresult rv = NS_OK;
if (NS_TIMER_STYLE_RESOLUTION == aTimerID) {
if (*aIsEnabled != nsnull) {
*aIsEnabled = mTimerEnabled;
}
}
else
rv = NS_ERROR_NOT_IMPLEMENTED;
return rv;
}
NS_IMETHODIMP
StyleSetImpl::ResetTimer(PRUint32 aTimerID)
{
nsresult rv = NS_OK;
if (NS_TIMER_STYLE_RESOLUTION == aTimerID) {
MOZ_TIMER_RESET(mStyleResolutionWatch);
}
else
rv = NS_ERROR_NOT_IMPLEMENTED;
return rv;
}
NS_IMETHODIMP
StyleSetImpl::StartTimer(PRUint32 aTimerID)
{
nsresult rv = NS_OK;
if (NS_TIMER_STYLE_RESOLUTION == aTimerID) {
// only do it if enabled
if (mTimerEnabled) {
MOZ_TIMER_START(mStyleResolutionWatch);
} else {
#ifdef NOISY_DEBUG
printf( "Attempt to start timer while disabled - ignoring\n" );
#endif
}
}
else
rv = NS_ERROR_NOT_IMPLEMENTED;
return rv;
}
NS_IMETHODIMP
StyleSetImpl::StopTimer(PRUint32 aTimerID)
{
nsresult rv = NS_OK;
if (NS_TIMER_STYLE_RESOLUTION == aTimerID) {
// only do it if enabled
if (mTimerEnabled) {
MOZ_TIMER_STOP(mStyleResolutionWatch);
} else {
#ifdef NOISY_DEBUG
printf( "Attempt to stop timer while disabled - ignoring\n" );
#endif
}
}
else
rv = NS_ERROR_NOT_IMPLEMENTED;
return rv;
}
NS_IMETHODIMP
StyleSetImpl::PrintTimer(PRUint32 aTimerID)
{
nsresult rv = NS_OK;
if (NS_TIMER_STYLE_RESOLUTION == aTimerID) {
MOZ_TIMER_PRINT(mStyleResolutionWatch);
}
else
rv = NS_ERROR_NOT_IMPLEMENTED;
return rv;
}
#endif
//-----------------------------------------------------------------------------
#ifdef SHARE_STYLECONTEXTS
#ifdef USE_FAST_CACHE
// StyleContextCache is a hash table based data structure that maintains
// a list of entries on each hashkey. Thus, multiple items with the same
// ID (key) can be stored in the hash table. The hash-lookup gets the list of
// items having that ID (key). The list is unsorted and vector-based so it is
// best if kept short.
//
// This choice of data structures was based upon knowledge that there are not
// many items sharing the same ID, and that there are many unique IDs, so
// this is a comprimise between a sorted-list based lookup and a hash-type
// lookup which is not possible due to non-guaranteed-unique keys.
MOZ_DECL_CTOR_COUNTER(StyleContextCache)
StyleContextCache::StyleContextCache(void)
:mHashTable(nsnull, nsnull, HashTableEnumDestroy, nsnull),
mCount(0)
{
MOZ_COUNT_CTOR(StyleContextCache);
}
StyleContextCache::~StyleContextCache(void)
{
// mHashTable memeber is reset automatically in nsObjectHashTable's dtor
MOZ_COUNT_DTOR(StyleContextCache);
}
PRUint32 StyleContextCache::Count(void)
{
#ifdef ENABLE_FAST_CACHE_TICKLE
// Tickle will test the integrity of the elements in the chace...
// - use if it is in question (has already been tested so it is now being commented-out)
Tickle("From Count()");
#endif
#ifdef NOISY_DEBUG
printf("StyleContextCache count: %ld\n", (long)mCount);
#endif
return mCount;
}
nsresult StyleContextCache::AddContext(scKey aKey, nsIStyleContext *aContext)
{
// verify we have a list
nsresult rv = VerifyList(aKey);
if (NS_SUCCEEDED(rv)){
nsVoidArray *pList = GetList(aKey);
NS_ASSERTION(pList != nsnull, "VerifyList failed me!");
NS_ASSERTION(pList->IndexOf(aContext) == -1, "Context already in list");
if(pList->IndexOf(aContext) == -1){
if (!(pList->AppendElement(aContext))) {
rv = NS_ERROR_FAILURE;
} else {
mCount++;
}
DumpStats();
} else {
#ifdef DEBUG
printf( "Context already in list in StyleContextCache::AddContext\n");
#endif
rv = NS_ERROR_FAILURE;
}
}
return rv;
}
nsresult StyleContextCache::RemoveContext(scKey aKey, nsIStyleContext *aContext)
{
nsresult rv = NS_ERROR_FAILURE;
nsVoidArray *pResults = nsnull;
if (NS_SUCCEEDED(GetContexts(aKey,&pResults)) && pResults) {
PRUint32 nCountBefore = Count();
if (nCountBefore > 0){
if(pResults->RemoveElement(aContext)) {
mCount--;
}
#ifdef DEBUG
else {
NS_ASSERTION(PR_FALSE,"Failure to remove context at provided key!");
}
#endif
}
DumpStats();
static PRBool bRemoveEmptyLists = PR_FALSE;
// if no more entries left, remove the list and all...
if (bRemoveEmptyLists && pResults->Count() == 0) {
rv = RemoveAllContexts(aKey);
if (NS_SUCCEEDED(rv)) {
NS_ASSERTION(GetList(aKey) == nsnull, "Failed to delete list in StyleContextCache::RemoveContext");
}
#ifdef DEBUG
else {
printf( "Error removing all contexts in StyleContextCache::RemoveContext\n");
}
#endif
}
}
#ifdef DEBUG
else {
NS_ASSERTION(PR_FALSE, "Failure to find any contexts at provided key!");
}
#endif
return rv;
}
nsresult StyleContextCache::RemoveAllContexts(scKey aKey)
{
nsresult rv = NS_OK;
nsVoidKey key((void *)aKey);
nsVoidArray *pResults = (nsVoidArray *)mHashTable.Remove(&key);
if (pResults) {
delete pResults;
}
return rv;
}
nsresult StyleContextCache::GetContexts(scKey aKey, nsVoidArray **aResults)
{
nsresult rv = NS_OK;
*aResults = GetList(aKey);
if (nsnull==aResults) rv = NS_ERROR_FAILURE;
return rv;
}
// make sure there is a list for the specified key
nsresult StyleContextCache::VerifyList(scKey aKey)
{
nsresult rv = NS_OK;
nsVoidKey key((void *)aKey);
if (GetList(aKey) == nsnull) {
nsVoidArray *pList = AllocateList();
if (pList) {
mHashTable.Put(&key,pList);
} else {
rv = NS_ERROR_FAILURE;
}
}
return rv;
}
nsVoidArray *StyleContextCache::AllocateList(void)
{
// we allocate it using 'new'
return new nsVoidArray();
}
nsresult StyleContextCache::DestroyList(nsVoidArray* aList)
{
if(aList) {
// we free it using 'delete'
delete aList;
}
return NS_OK;
}
// returns the list for the key, may be null
nsVoidArray *StyleContextCache::GetList(scKey aKey)
{
nsVoidKey key((void *)aKey);
return (nsVoidArray *)mHashTable.Get(&key);
}
// called to destroy each list in the hash table:
// - must free the list passed in as aData
PRBool PR_CALLBACK HashTableEnumDestroy(nsHashKey *aKey, void *aData, void* closure)
{
if(aData) {
StyleContextCache::DestroyList((nsVoidArray*)aData);
}
return PR_TRUE;
}
PRBool PR_CALLBACK HashTableEnumDump(nsHashKey *aKey, void *aData, void* closure)
{
static PRUint32 nTotal, nCount, nMax, nMin, nUnary;
if (nsnull == aKey && nsnull == aData && nsnull == closure) {
// reset the counters
nTotal = nCount = nMax = nMin = nUnary = 0;
return PR_TRUE;
}
if (nsnull == aKey && nsnull == aData && closure != nsnull) {
// dump the cumulatives
printf("----------------------------------------------------------------------------------\n");
printf("(%d lists, %ld contexts) List Lengths: Min=%ld Max=%ld Average=%ld Unary=%ld\n",
(int)nCount, (long)nTotal, (long)nMin, (long)nMax, (long)(nCount>0 ? nTotal/nCount : 0), (long)nUnary);
printf("----------------------------------------------------------------------------------\n");
return PR_TRUE;
}
// actually do the dump
nsVoidArray *pList = (nsVoidArray *)aData;
if (pList) {
PRUint32 count = pList->Count();
printf("List Length at key %lu:\t%ld\n",
(unsigned long)aKey->HashCode(),
(long)count );
nCount++;
nTotal += count;
if (count > nMax) nMax = count;
if (count < nMin) nMin = count;
if (count == 1) nUnary++;
}
return PR_TRUE;
}
PRBool PR_CALLBACK HashTableEnumTickle(nsHashKey *aKey, void *aData, void* closure)
{
PRUint32 nCount = 0;
// each entry is a list
nsVoidArray *pList = (nsVoidArray *)aData;
if (pList) {
PRUint32 count = pList->Count();
PRUint32 i;
// walk the list and get each context's key (just a way to tickle it)
for (i=0; i < count; i++) {
nsIStyleContext *pContext = (nsIStyleContext *)pList->ElementAt(i);
if (pContext) {
scKey key;
pContext->GetStyleContextKey(key);
if((PRUint32)key != (PRUint32)aKey->HashCode()){
NS_ASSERTION(PR_FALSE,"Key Changed in context!");
}
// printf( "%p tickled\n", pContext);
}
}
}
return PR_TRUE;
}
void StyleContextCache::DumpStats(void)
{
#ifdef DUMP_CACHE_STATS
printf("StyleContextCache DumpStats BEGIN\n");
HashTableEnumDump(nsnull, nsnull, nsnull);
mHashTable.Enumerate(HashTableEnumDump);
HashTableEnumDump(nsnull, nsnull, "HACK!");
printf("StyleContextCache DumpStats END\n");
#endif
}
void StyleContextCache::Tickle(const char *msg)
{
#ifdef DEBUG
// printf("Tickling: %s\n", msg ? msg : "");
mHashTable.Enumerate(HashTableEnumTickle);
// printf("Tickle done.\n");
#endif
}
#endif // USE_FASTCACHE
NS_IMETHODIMP
StyleSetImpl::AddStyleContext(nsIStyleContext *aNewStyleContext)
{
nsresult rv = NS_OK;
// ASSERT the input is valid
NS_ASSERTION(aNewStyleContext != nsnull, "NULL style context not allowed in AddStyleContext");
#ifdef USE_FAST_CACHE
if (aNewStyleContext) {
scKey key;
aNewStyleContext->GetStyleContextKey(key);
rv = mStyleContextCache.AddContext(key,aNewStyleContext);
#ifdef NOISY_DEBUG
printf( "StyleContextCount: %ld\n", (long)mStyleContextCache.Count());
#endif
}
#else // DONT USE_FAST_CACHE
// ASSERT it is not already in the collection
NS_ASSERTION((mStyleContextCache.IndexOf(aNewStyleContext) == -1), "StyleContext added in AddStyleContext is already in cache");
if (aNewStyleContext) {
rv = mStyleContextCache.AppendElement(aNewStyleContext);
#ifdef NOISY_DEBUG
printf( "StyleContextCount: %ld\n", (long)mStyleContextCache.Count());
#endif
}
#endif // USE_FAST_CACHE
return rv;
}
NS_IMETHODIMP
StyleSetImpl::RemoveStyleContext(nsIStyleContext *aNewStyleContext)
{
nsresult rv = NS_OK;
// ASSERT the input is valid
NS_ASSERTION(aNewStyleContext != nsnull, "NULL style context not allowed in RemoveStyleContext");
#ifdef USE_FAST_CACHE
if (aNewStyleContext) {
scKey key;
aNewStyleContext->GetStyleContextKey(key);
rv = mStyleContextCache.RemoveContext(key,aNewStyleContext);
#ifdef NOISY_DEBUG
printf( "StyleContextCount: %ld\n", (long)mStyleContextCache.Count());
#endif
}
#else //DONT USE_FAST_CACHE
// ASSERT it is already in the collection
NS_ASSERTION((mStyleContextCache.IndexOf(aNewStyleContext) != -1), "StyleContext removed in AddStyleContext is not in cache");
if (aNewStyleContext) {
rv = mStyleContextCache.RemoveElement(aNewStyleContext);
#ifdef NOISY_DEBUG
printf( "StyleContextCount: %ld\n", (long)mStyleContextCache.Count());
#endif
}
#endif //#ifdef USE_FAST_CACHE
return rv;
}
NS_IMETHODIMP
StyleSetImpl::FindMatchingContext(nsIStyleContext *aStyleContextToMatch,
nsIStyleContext **aMatchingContext)
{
nsresult rv = NS_ERROR_FAILURE;
*aMatchingContext = nsnull;
#ifdef USE_FAST_CACHE
nsVoidArray *pList = nsnull;
scKey key;
aStyleContextToMatch->GetStyleContextKey(key);
if (NS_SUCCEEDED(mStyleContextCache.GetContexts(key, &pList)) && pList) {
PRInt32 count = pList->Count();
PRInt32 i;
for (i=0; i<count;i++) {
nsIStyleContext *pContext = (nsIStyleContext *)pList->ElementAt(i);
if (pContext && pContext != aStyleContextToMatch) {
PRBool bMatches = PR_FALSE;
NS_ADDREF(pContext);
if (NS_SUCCEEDED(pContext->StyleDataMatches(aStyleContextToMatch, &bMatches)) &&
bMatches) {
*aMatchingContext = pContext;
rv = NS_OK;
break;
} else {
NS_RELEASE(pContext);
}
}
}
}
#else // DONT USE_FAST_CACHE
PRInt32 count = mStyleContextCache.Count();
PRInt32 i;
for (i=0; i<count;i++) {
nsIStyleContext *pContext = (nsIStyleContext *)mStyleContextCache.ElementAt(i);
if (pContext && pContext != aStyleContextToMatch) {
PRBool bMatches = PR_FALSE;
NS_ADDREF(pContext);
if (NS_SUCCEEDED(pContext->StyleDataMatches(aStyleContextToMatch, &bMatches)) &&
bMatches) {
*aMatchingContext = pContext;
rv = NS_OK;
break;
} else {
NS_RELEASE(pContext);
}
}
}
#endif // #ifdef USE_FAST_CACHE
return rv;
}
#endif // SHARE_STYLECONTEXTS
//-----------------------------------------------------------------------------
// static
nsUniqueStyleItems *nsUniqueStyleItems ::mInstance = nsnull;
void StyleSetImpl::ResetUniqueStyleItems(void)
{
UNIQUE_STYLE_ITEMS(uniqueItems);
uniqueItems->Clear();
}
struct AttributeContentPair {
nsIAtom *attribute;
nsIContent *content;
};
static PRBool
EnumAffectsStyle(nsISupports *aElement, void *aData)
{
nsIStyleSheet *sheet = NS_STATIC_CAST(nsIStyleSheet *, aElement);
AttributeContentPair *pair = (AttributeContentPair *)aData;
PRBool affects;
if (NS_FAILED(sheet->AttributeAffectsStyle(pair->attribute, pair->content,
affects)) || affects)
return PR_FALSE; // stop checking
return PR_TRUE;
}
NS_IMETHODIMP
StyleSetImpl::AttributeAffectsStyle(nsIAtom *aAttribute, nsIContent *aContent,
PRBool &aAffects)
{
AttributeContentPair pair;
pair.attribute = aAttribute;
pair.content = aContent;
/* check until we find a sheet that will be affected */
if ((mDocSheets && !mDocSheets->EnumerateForwards(EnumAffectsStyle, &pair)) ||
(mOverrideSheets && !mOverrideSheets->EnumerateForwards(EnumAffectsStyle,
&pair)) ||
(mBackstopSheets && !mBackstopSheets->EnumerateForwards(EnumAffectsStyle,
&pair))) {
aAffects = PR_TRUE;
} else {
aAffects = PR_FALSE;
}
return NS_OK;
}
/******************************************************************************
* SizeOf method:
*
* Self (reported as StyleSetImpl's size):
* 1) sizeof(*this) + sizeof (overhead only) each collection that exists
* and the FrameConstructor overhead
*
* Contained / Aggregated data (not reported as StyleSetImpl's size):
* 1) Override Sheets, DocSheets, BackstopSheets, RuleProcessors, Recycler
* are all delegated to.
*
* Children / siblings / parents:
* none
*
******************************************************************************/
void StyleSetImpl::SizeOf(nsISizeOfHandler *aSizeOfHandler, PRUint32 &aSize)
{
NS_ASSERTION(aSizeOfHandler != nsnull, "SizeOf handler cannot be null");
// first get the unique items collection
UNIQUE_STYLE_ITEMS(uniqueItems);
if(! uniqueItems->AddItem((void*)this) ){
NS_ASSERTION(0, "StyleSet has already been conted in SizeOf operation");
// styleset has already been accounted for
return;
}
// get or create a tag for this instance
nsCOMPtr<nsIAtom> tag;
tag = getter_AddRefs(NS_NewAtom("StyleSet"));
// get the size of an empty instance and add to the sizeof handler
aSize = sizeof(StyleSetImpl);
// Next get the size of the OVERHEAD of objects we will delegate to:
if (mOverrideSheets && uniqueItems->AddItem(mOverrideSheets)){
aSize += sizeof(*mOverrideSheets);
}
if (mDocSheets && uniqueItems->AddItem(mDocSheets)){
aSize += sizeof(*mDocSheets);
}
if (mBackstopSheets && uniqueItems->AddItem(mBackstopSheets)){
aSize += sizeof(*mBackstopSheets);
}
if (mBackstopRuleProcessors && uniqueItems->AddItem(mBackstopRuleProcessors)){
aSize += sizeof(*mBackstopRuleProcessors);
}
if (mDocRuleProcessors && uniqueItems->AddItem(mDocRuleProcessors)){
aSize += sizeof(*mDocRuleProcessors);
}
if (mOverrideRuleProcessors && uniqueItems->AddItem(mOverrideRuleProcessors)){
aSize += sizeof(*mOverrideRuleProcessors);
}
if (mRecycler && uniqueItems->AddItem(mRecycler)){
aSize += sizeof(*mRecycler);
}
if (mQuirkStyleSheet) {
aSize += sizeof(mQuirkStyleSheet); // just the pointer: the sheet is counted elsewhere
}
///////////////////////////////////////////////
// now the FrameConstructor
if(mFrameConstructor && uniqueItems->AddItem((void*)mFrameConstructor)){
aSize += sizeof(mFrameConstructor);
}
aSizeOfHandler->AddSize(tag,aSize);
///////////////////////////////////////////////
// Now travers the collections and delegate
PRInt32 numSheets, curSheet;
PRUint32 localSize=0;
numSheets = GetNumberOfOverrideStyleSheets();
for(curSheet=0; curSheet < numSheets; curSheet++){
nsIStyleSheet* pSheet = GetOverrideStyleSheetAt(curSheet); //addref
if(pSheet){
localSize=0;
pSheet->SizeOf(aSizeOfHandler, localSize);
}
NS_IF_RELEASE(pSheet);
}
numSheets = GetNumberOfDocStyleSheets();
for(curSheet=0; curSheet < numSheets; curSheet++){
nsIStyleSheet* pSheet = GetDocStyleSheetAt(curSheet);
if(pSheet){
localSize=0;
pSheet->SizeOf(aSizeOfHandler, localSize);
}
NS_IF_RELEASE(pSheet);
}
numSheets = GetNumberOfBackstopStyleSheets();
for(curSheet=0; curSheet < numSheets; curSheet++){
nsIStyleSheet* pSheet = GetBackstopStyleSheetAt(curSheet);
if(pSheet){
localSize=0;
pSheet->SizeOf(aSizeOfHandler, localSize);
}
NS_IF_RELEASE(pSheet);
}
///////////////////////////////////////////////
// rule processors
PRUint32 numRuleProcessors,curRuleProcessor;
if(mBackstopRuleProcessors){
mBackstopRuleProcessors->Count(&numRuleProcessors);
for(curRuleProcessor=0; curRuleProcessor < numRuleProcessors; curRuleProcessor++){
nsIStyleRuleProcessor* processor =
(nsIStyleRuleProcessor* )mBackstopRuleProcessors->ElementAt(curRuleProcessor);
if(processor){
localSize=0;
processor->SizeOf(aSizeOfHandler, localSize);
}
NS_IF_RELEASE(processor);
}
}
if(mDocRuleProcessors){
mDocRuleProcessors->Count(&numRuleProcessors);
for(curRuleProcessor=0; curRuleProcessor < numRuleProcessors; curRuleProcessor++){
nsIStyleRuleProcessor* processor =
(nsIStyleRuleProcessor* )mDocRuleProcessors->ElementAt(curRuleProcessor);
if(processor){
localSize=0;
processor->SizeOf(aSizeOfHandler, localSize);
}
NS_IF_RELEASE(processor);
}
}
if(mOverrideRuleProcessors){
mOverrideRuleProcessors->Count(&numRuleProcessors);
for(curRuleProcessor=0; curRuleProcessor < numRuleProcessors; curRuleProcessor++){
nsIStyleRuleProcessor* processor =
(nsIStyleRuleProcessor* )mOverrideRuleProcessors->ElementAt(curRuleProcessor);
if(processor){
localSize=0;
processor->SizeOf(aSizeOfHandler, localSize);
}
NS_IF_RELEASE(processor);
}
}
///////////////////////////////////////////////
// and the recycled ones too
if(mRecycler){
mRecycler->Count(&numRuleProcessors);
for(curRuleProcessor=0; curRuleProcessor < numRuleProcessors; curRuleProcessor++){
nsIStyleRuleProcessor* processor =
(nsIStyleRuleProcessor* )mRecycler->ElementAt(curRuleProcessor);
if(processor && uniqueItems->AddItem((void*)processor)){
localSize=0;
processor->SizeOf(aSizeOfHandler, localSize);
}
NS_IF_RELEASE(processor);
}
}
// XXX - do the stylecontext cache too
// now delegate the sizeof to the larger or more complex aggregated objects
// - none
}
void
StyleSetImpl::WalkRuleProcessors(nsISupportsArrayEnumFunc aFunc, void* aData,
nsIContent* aContent)
{
// Walk the backstop rules first.
if (mBackstopRuleProcessors)
mBackstopRuleProcessors->EnumerateForwards(aFunc, aData);
PRBool useRuleProcessors = PR_TRUE;
if (mStyleRuleSupplier) {
// We can supply additional document-level sheets that should be walked.
mStyleRuleSupplier->WalkRules(this, aFunc, aData, aContent);
mStyleRuleSupplier->UseDocumentRules(aContent, &useRuleProcessors);
}
// Walk the doc rules next.
if (mDocRuleProcessors && useRuleProcessors)
mDocRuleProcessors->EnumerateForwards(aFunc, aData);
// Walk the override rules last.
if (mOverrideRuleProcessors)
mOverrideRuleProcessors->EnumerateForwards(aFunc, aData);
}
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