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gecko-dev/layout/style/nsCSSStyleSheet.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 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "nsICSSStyleSheet.h"
#include "nsIArena.h"
#include "nsCRT.h"
#include "nsIAtom.h"
#include "nsIURL.h"
#include "nsISupportsArray.h"
#include "nsHashtable.h"
#include "nsICSSStyleRule.h"
#include "nsIHTMLContent.h"
#include "nsIDocument.h"
#include "nsIPresContext.h"
#include "nsILinkHandler.h"
#include "nsHTMLAtoms.h"
#include "nsIFrame.h"
#include "nsString.h"
#include "nsIPtr.h"
#include "nsHTMLIIDs.h"
#include "nsIDOMStyleSheetCollection.h"
#include "nsIDOMCSSStyleSheet.h"
#include "nsIDOMCSSStyleRule.h"
#include "nsIDOMCSSStyleRuleCollection.h"
#include "nsIScriptObjectOwner.h"
#include "nsIScriptGlobalObject.h"
#include "nsICSSParser.h"
//#define DEBUG_REFS
//#define DEBUG_RULES
static NS_DEFINE_IID(kICSSStyleSheetIID, NS_ICSS_STYLE_SHEET_IID);
static NS_DEFINE_IID(kIStyleSheetIID, NS_ISTYLE_SHEET_IID);
static NS_DEFINE_IID(kIStyleRuleIID, NS_ISTYLE_RULE_IID);
static NS_DEFINE_IID(kIDOMStyleSheetIID, NS_IDOMSTYLESHEET_IID);
static NS_DEFINE_IID(kIDOMCSSStyleSheetIID, NS_IDOMCSSSTYLESHEET_IID);
static NS_DEFINE_IID(kIDOMCSSStyleRuleIID, NS_IDOMCSSSTYLERULE_IID);
static NS_DEFINE_IID(kIDOMCSSStyleRuleCollectionIID, NS_IDOMCSSSTYLERULECOLLECTION_IID);
static NS_DEFINE_IID(kIDOMStyleSheetCollectionIID, NS_IDOMSTYLESHEETCOLLECTION_IID);
static NS_DEFINE_IID(kIScriptObjectOwnerIID, NS_ISCRIPTOBJECTOWNER_IID);
NS_DEF_PTR(nsIHTMLContent);
NS_DEF_PTR(nsIContent);
NS_DEF_PTR(nsIStyleRule);
NS_DEF_PTR(nsICSSStyleRule);
NS_DEF_PTR(nsIURL);
NS_DEF_PTR(nsISupportsArray);
NS_DEF_PTR(nsICSSStyleSheet);
// ----------------------
// Rule hash key
//
class RuleKey: public nsHashKey {
public:
RuleKey(nsIAtom* aAtom);
RuleKey(const RuleKey& aKey);
virtual ~RuleKey(void);
virtual PRUint32 HashValue(void) const;
virtual PRBool Equals(const nsHashKey *aKey) const;
virtual nsHashKey *Clone(void) const;
nsIAtom* mAtom;
};
RuleKey::RuleKey(nsIAtom* aAtom)
{
mAtom = aAtom;
NS_ADDREF(mAtom);
}
RuleKey::RuleKey(const RuleKey& aKey)
{
mAtom = aKey.mAtom;
NS_ADDREF(mAtom);
}
RuleKey::~RuleKey(void)
{
NS_RELEASE(mAtom);
}
PRUint32 RuleKey::HashValue(void) const
{
return (PRUint32)mAtom;
}
PRBool RuleKey::Equals(const nsHashKey* aKey) const
{
return PRBool (((RuleKey*)aKey)->mAtom == mAtom);
}
nsHashKey* RuleKey::Clone(void) const
{
return new RuleKey(*this);
}
struct RuleValue {
RuleValue(nsICSSStyleRule* aRule, PRInt32 aIndex)
{
mRule = aRule;
mIndex = aIndex;
mNext = nsnull;
}
~RuleValue(void)
{
if (nsnull != mNext) {
delete mNext;
}
}
nsICSSStyleRule* mRule;
PRInt32 mIndex;
RuleValue* mNext;
};
// ------------------------------
// Rule hash table
//
// Enumerator callback function.
typedef void (*RuleEnumFunc)(nsICSSStyleRule* aRule, void *aData);
class RuleHash {
public:
RuleHash(void);
~RuleHash(void);
void AppendRule(nsICSSStyleRule* aRule);
void EnumerateAllRules(nsIAtom* aTag, nsIAtom* aID, nsIAtom* aClass,
RuleEnumFunc aFunc, void* aData);
void EnumerateTagRules(nsIAtom* aTag,
RuleEnumFunc aFunc, void* aData);
protected:
void AppendRuleToTable(nsHashtable& aTable, nsIAtom* aAtom, nsICSSStyleRule* aRule);
PRInt32 mRuleCount;
nsHashtable mTagTable;
nsHashtable mIdTable;
nsHashtable mClassTable;
};
RuleHash::RuleHash(void)
: mRuleCount(0),
mTagTable(), mIdTable(), mClassTable()
{
}
static PRBool DeleteValue(nsHashKey* aKey, void* aValue, void* closure)
{
delete ((RuleValue*)aValue);
return PR_TRUE;
}
RuleHash::~RuleHash(void)
{
mTagTable.Enumerate(DeleteValue);
mIdTable.Enumerate(DeleteValue);
mClassTable.Enumerate(DeleteValue);
}
void RuleHash::AppendRuleToTable(nsHashtable& aTable, nsIAtom* aAtom, nsICSSStyleRule* aRule)
{
RuleKey key(aAtom);
RuleValue* value = (RuleValue*)aTable.Get(&key);
if (nsnull == value) {
value = new RuleValue(aRule, mRuleCount++);
aTable.Put(&key, value);
}
else {
while (nsnull != value->mNext) {
value = value->mNext;
}
value->mNext = new RuleValue(aRule, mRuleCount++);
}
}
void RuleHash::AppendRule(nsICSSStyleRule* aRule)
{
nsCSSSelector* selector = aRule->FirstSelector();
if (nsnull != selector->mID) {
AppendRuleToTable(mIdTable, selector->mID, aRule);
}
else if (nsnull != selector->mClass) {
AppendRuleToTable(mClassTable, selector->mClass, aRule);
}
else if (nsnull != selector->mTag) {
AppendRuleToTable(mTagTable, selector->mTag, aRule);
}
}
void RuleHash::EnumerateAllRules(nsIAtom* aTag, nsIAtom* aID, nsIAtom* aClass,
RuleEnumFunc aFunc, void* aData)
{
RuleValue* tagValue = nsnull;
RuleValue* idValue = nsnull;
RuleValue* classValue = nsnull;
if (nsnull != aTag) {
RuleKey tagKey(aTag);
tagValue = (RuleValue*)mTagTable.Get(&tagKey);
}
if (nsnull != aID) {
RuleKey idKey(aID);
idValue = (RuleValue*)mIdTable.Get(&idKey);
}
if (nsnull != aClass) {
RuleKey classKey(aClass);
classValue = (RuleValue*)mClassTable.Get(&classKey);
}
PRInt32 tagIndex = ((nsnull != tagValue) ? tagValue->mIndex : mRuleCount);
PRInt32 idIndex = ((nsnull != idValue) ? idValue->mIndex : mRuleCount);
PRInt32 classIndex = ((nsnull != classValue) ? classValue->mIndex : mRuleCount);
while ((nsnull != tagValue) || (nsnull != idValue) || (nsnull != classValue)) {
if ((tagIndex < idIndex) && (tagIndex < classIndex)) {
(*aFunc)(tagValue->mRule, aData);
tagValue = tagValue->mNext;
tagIndex = ((nsnull != tagValue) ? tagValue->mIndex : mRuleCount);
}
else if (idIndex < classIndex) {
(*aFunc)(idValue->mRule, aData);
idValue = idValue->mNext;
idIndex = ((nsnull != idValue) ? idValue->mIndex : mRuleCount);
}
else {
(*aFunc)(classValue->mRule, aData);
classValue = classValue->mNext;
classIndex = ((nsnull != classValue) ? classValue->mIndex : mRuleCount);
}
}
}
void RuleHash::EnumerateTagRules(nsIAtom* aTag, RuleEnumFunc aFunc, void* aData)
{
RuleKey tagKey(aTag);
RuleValue* value = (RuleValue*)mTagTable.Get(&tagKey);
while (nsnull != value) {
(*aFunc)(value->mRule, aData);
value = value->mNext;
}
}
// -------------------------------
// Style Rule Collection for the DOM
//
class CSSStyleRuleCollectionImpl : public nsIDOMCSSStyleRuleCollection,
public nsIScriptObjectOwner
{
public:
CSSStyleRuleCollectionImpl(nsICSSStyleSheet *aStyleSheet);
NS_DECL_ISUPPORTS
// nsIDOMCSSStyleRuleCollection interface
NS_IMETHOD GetLength(PRUint32* aLength);
NS_IMETHOD Item(PRUint32 aIndex, nsIDOMCSSStyleRule** aReturn);
// nsIScriptObjectOwner interface
NS_IMETHOD GetScriptObject(nsIScriptContext *aContext, void** aScriptObject);
NS_IMETHOD SetScriptObject(void* aScriptObject);
void DropReference() { mStyleSheet = nsnull; }
protected:
virtual ~CSSStyleRuleCollectionImpl();
nsICSSStyleSheet* mStyleSheet;
void* mScriptObject;
};
CSSStyleRuleCollectionImpl::CSSStyleRuleCollectionImpl(nsICSSStyleSheet *aStyleSheet)
{
NS_INIT_REFCNT();
// Not reference counted to avoid circular references.
// The style sheet will tell us when its going away.
mStyleSheet = aStyleSheet;
mScriptObject = nsnull;
}
CSSStyleRuleCollectionImpl::~CSSStyleRuleCollectionImpl()
{
}
NS_IMPL_ADDREF(CSSStyleRuleCollectionImpl);
NS_IMPL_RELEASE(CSSStyleRuleCollectionImpl);
nsresult
CSSStyleRuleCollectionImpl::QueryInterface(REFNSIID aIID, void** aInstancePtrResult)
{
if (NULL == aInstancePtrResult) {
return NS_ERROR_NULL_POINTER;
}
static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
if (aIID.Equals(kIDOMCSSStyleRuleCollectionIID)) {
nsIDOMCSSStyleRuleCollection *tmp = this;
*aInstancePtrResult = (void*) tmp;
AddRef();
return NS_OK;
}
if (aIID.Equals(kIScriptObjectOwnerIID)) {
nsIScriptObjectOwner *tmp = this;
*aInstancePtrResult = (void*) tmp;
AddRef();
return NS_OK;
}
if (aIID.Equals(kISupportsIID)) {
nsIDOMCSSStyleRuleCollection *tmp = this;
nsISupports *tmp2 = tmp;
*aInstancePtrResult = (void*) tmp2;
AddRef();
return NS_OK;
}
return NS_NOINTERFACE;
}
NS_IMETHODIMP
CSSStyleRuleCollectionImpl::GetLength(PRUint32* aLength)
{
if (nsnull != mStyleSheet) {
*aLength = mStyleSheet->StyleRuleCount();
}
else {
*aLength = 0;
}
return NS_OK;
}
NS_IMETHODIMP
CSSStyleRuleCollectionImpl::Item(PRUint32 aIndex, nsIDOMCSSStyleRule** aReturn)
{
nsresult result = NS_OK;
*aReturn = nsnull;
if (nsnull != mStyleSheet) {
nsICSSStyleRule *rule;
result = mStyleSheet->GetStyleRuleAt(aIndex, rule);
if (NS_OK == result) {
result = rule->QueryInterface(kIDOMCSSStyleRuleIID, (void **)aReturn);
}
NS_RELEASE(rule);
}
return result;
}
NS_IMETHODIMP
CSSStyleRuleCollectionImpl::GetScriptObject(nsIScriptContext *aContext,
void** aScriptObject)
{
nsresult res = NS_OK;
if (nsnull == mScriptObject) {
nsISupports *supports = (nsISupports *)(nsIDOMCSSStyleRuleCollection *)this;
// XXX Should be done through factory
res = NS_NewScriptCSSStyleRuleCollection(aContext,
supports,
(nsISupports *)mStyleSheet,
(void**)&mScriptObject);
}
*aScriptObject = mScriptObject;
return res;
}
NS_IMETHODIMP
CSSStyleRuleCollectionImpl::SetScriptObject(void* aScriptObject)
{
mScriptObject = aScriptObject;
return NS_OK;
}
// -------------------------------
// Imports Collection for the DOM
//
class CSSImportsCollectionImpl : public nsIDOMStyleSheetCollection,
public nsIScriptObjectOwner
{
public:
CSSImportsCollectionImpl(nsICSSStyleSheet *aStyleSheet);
NS_DECL_ISUPPORTS
// nsIDOMCSSStyleSheetCollection interface
NS_IMETHOD GetLength(PRUint32* aLength);
NS_IMETHOD Item(PRUint32 aIndex, nsIDOMStyleSheet** aReturn);
// nsIScriptObjectOwner interface
NS_IMETHOD GetScriptObject(nsIScriptContext *aContext, void** aScriptObject);
NS_IMETHOD SetScriptObject(void* aScriptObject);
void DropReference() { mStyleSheet = nsnull; }
protected:
virtual ~CSSImportsCollectionImpl();
nsICSSStyleSheet* mStyleSheet;
void* mScriptObject;
};
CSSImportsCollectionImpl::CSSImportsCollectionImpl(nsICSSStyleSheet *aStyleSheet)
{
NS_INIT_REFCNT();
// Not reference counted to avoid circular references.
// The style sheet will tell us when its going away.
mStyleSheet = aStyleSheet;
mScriptObject = nsnull;
}
CSSImportsCollectionImpl::~CSSImportsCollectionImpl()
{
}
NS_IMPL_ADDREF(CSSImportsCollectionImpl);
NS_IMPL_RELEASE(CSSImportsCollectionImpl);
nsresult
CSSImportsCollectionImpl::QueryInterface(REFNSIID aIID, void** aInstancePtrResult)
{
if (NULL == aInstancePtrResult) {
return NS_ERROR_NULL_POINTER;
}
static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
if (aIID.Equals(kIDOMStyleSheetCollectionIID)) {
nsIDOMStyleSheetCollection *tmp = this;
*aInstancePtrResult = (void*) tmp;
AddRef();
return NS_OK;
}
if (aIID.Equals(kIScriptObjectOwnerIID)) {
nsIScriptObjectOwner *tmp = this;
*aInstancePtrResult = (void*) tmp;
AddRef();
return NS_OK;
}
if (aIID.Equals(kISupportsIID)) {
nsIDOMStyleSheetCollection *tmp = this;
nsISupports *tmp2 = tmp;
*aInstancePtrResult = (void*) tmp2;
AddRef();
return NS_OK;
}
return NS_NOINTERFACE;
}
NS_IMETHODIMP
CSSImportsCollectionImpl::GetLength(PRUint32* aLength)
{
if (nsnull != mStyleSheet) {
*aLength = mStyleSheet->StyleSheetCount();
}
else {
*aLength = 0;
}
return NS_OK;
}
NS_IMETHODIMP
CSSImportsCollectionImpl::Item(PRUint32 aIndex, nsIDOMStyleSheet** aReturn)
{
nsresult result = NS_OK;
*aReturn = nsnull;
if (nsnull != mStyleSheet) {
nsICSSStyleSheet *sheet;
result = mStyleSheet->GetStyleSheetAt(aIndex, sheet);
if (NS_OK == result) {
result = sheet->QueryInterface(kIDOMStyleSheetIID, (void **)aReturn);
}
NS_RELEASE(sheet);
}
return result;
}
NS_IMETHODIMP
CSSImportsCollectionImpl::GetScriptObject(nsIScriptContext *aContext,
void** aScriptObject)
{
nsresult res = NS_OK;
if (nsnull == mScriptObject) {
nsISupports *supports = (nsISupports *)(nsIDOMStyleSheetCollection *)this;
// XXX Should be done through factory
res = NS_NewScriptStyleSheetCollection(aContext,
supports,
(nsISupports *)mStyleSheet,
(void**)&mScriptObject);
}
*aScriptObject = mScriptObject;
return res;
}
NS_IMETHODIMP
CSSImportsCollectionImpl::SetScriptObject(void* aScriptObject)
{
mScriptObject = aScriptObject;
return NS_OK;
}
// -------------------------------
// CSS Style Sheet
//
class CSSStyleSheetImpl : public nsICSSStyleSheet,
public nsIDOMCSSStyleSheet,
public nsIScriptObjectOwner {
public:
void* operator new(size_t size);
void* operator new(size_t size, nsIArena* aArena);
void operator delete(void* ptr);
CSSStyleSheetImpl(nsIURL* aURL);
NS_IMETHOD QueryInterface(const nsIID& aIID, void** aInstancePtr);
NS_IMETHOD_(nsrefcnt) AddRef();
NS_IMETHOD_(nsrefcnt) Release();
virtual PRInt32 RulesMatching(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIStyleContext* aParentContext,
nsISupportsArray* aResults);
virtual PRInt32 RulesMatching(nsIPresContext* aPresContext,
nsIContent* aParentContent,
nsIAtom* aPseudoTag,
nsIStyleContext* aParentContext,
nsISupportsArray* aResults);
virtual nsIURL* GetURL(void);
virtual PRBool ContainsStyleSheet(nsIURL* aURL);
virtual void AppendStyleSheet(nsICSSStyleSheet* aSheet);
// XXX do these belong here or are they generic?
virtual void PrependStyleRule(nsICSSStyleRule* aRule);
virtual void AppendStyleRule(nsICSSStyleRule* aRule);
virtual PRInt32 StyleRuleCount(void);
virtual nsresult GetStyleRuleAt(PRInt32 aIndex, nsICSSStyleRule*& aRule);
virtual PRInt32 StyleSheetCount();
virtual nsresult GetStyleSheetAt(PRInt32 aIndex, nsICSSStyleSheet*& aSheet);
virtual void List(FILE* out = stdout, PRInt32 aIndent = 0) const;
// nsIDOMStyleSheet interface
NS_IMETHOD GetDisabled(PRBool* aDisabled);
NS_IMETHOD SetDisabled(PRBool aDisabled);
NS_IMETHOD GetReadOnly(PRBool* aReadOnly);
// nsIDOMCSSStyleSheet interface
NS_IMETHOD GetOwningElement(nsIDOMHTMLElement** aOwningElement);
NS_IMETHOD GetParentStyleSheet(nsIDOMCSSStyleSheet** aParentStyleSheet);
NS_IMETHOD GetHref(nsString& aHref);
NS_IMETHOD GetTitle(nsString& aTitle);
NS_IMETHOD GetImports(nsIDOMStyleSheetCollection** aImports);
NS_IMETHOD GetRules(nsIDOMCSSStyleRuleCollection** aRules);
NS_IMETHOD AddRule(const nsString& aSelector, const nsString& aDeclaration, PRUint32 aIndex, PRUint32* aReturn);
NS_IMETHOD AddImport(const nsString& aUrl, PRUint32 aIndex, PRUint32* aReturn);
NS_IMETHOD RemoveRule(PRUint32 aIndex);
NS_IMETHOD RemoveImport(PRUint32 aIndex);
// nsIScriptObjectOwner interface
NS_IMETHOD GetScriptObject(nsIScriptContext *aContext, void** aScriptObject);
NS_IMETHOD SetScriptObject(void* aScriptObject);
private:
// These are not supported and are not implemented!
CSSStyleSheetImpl(const CSSStyleSheetImpl& aCopy);
CSSStyleSheetImpl& operator=(const CSSStyleSheetImpl& aCopy);
protected:
virtual ~CSSStyleSheetImpl();
void ClearHash(void);
void BuildHash(void);
protected:
PRUint32 mInHeap : 1;
PRUint32 mRefCnt : 31;
nsIURLPtr mURL;
nsICSSStyleSheetPtr mFirstChild;
nsISupportsArrayPtr mOrderedRules;
nsISupportsArrayPtr mWeightedRules;
nsICSSStyleSheetPtr mNext;
nsICSSStyleSheet* mParent;
RuleHash* mRuleHash;
CSSStyleRuleCollectionImpl* mRuleCollection;
CSSImportsCollectionImpl* mImportsCollection;
void * mScriptObject;
};
void* CSSStyleSheetImpl::operator new(size_t size)
{
CSSStyleSheetImpl* rv = (CSSStyleSheetImpl*) ::operator new(size);
#ifdef NS_DEBUG
if (nsnull != rv) {
nsCRT::memset(rv, 0xEE, size);
}
#endif
rv->mInHeap = 1;
return (void*) rv;
}
void* CSSStyleSheetImpl::operator new(size_t size, nsIArena* aArena)
{
CSSStyleSheetImpl* rv = (CSSStyleSheetImpl*) aArena->Alloc(PRInt32(size));
#ifdef NS_DEBUG
if (nsnull != rv) {
nsCRT::memset(rv, 0xEE, size);
}
#endif
rv->mInHeap = 0;
return (void*) rv;
}
void CSSStyleSheetImpl::operator delete(void* ptr)
{
CSSStyleSheetImpl* sheet = (CSSStyleSheetImpl*) ptr;
if (nsnull != sheet) {
if (sheet->mInHeap) {
::delete ptr;
}
}
}
#ifdef DEBUG_REFS
static PRInt32 gInstanceCount;
#endif
CSSStyleSheetImpl::CSSStyleSheetImpl(nsIURL* aURL)
: nsICSSStyleSheet(),
mURL(nsnull), mFirstChild(nsnull),
mOrderedRules(nsnull), mWeightedRules(nsnull),
mNext(nsnull),
mRuleHash(nsnull)
{
NS_INIT_REFCNT();
mURL.SetAddRef(aURL);
mParent = nsnull;
mRuleCollection = nsnull;
mImportsCollection = nsnull;
mScriptObject = nsnull;
#ifdef DEBUG_REFS
++gInstanceCount;
fprintf(stdout, "%d + CSSStyleSheet size: %d\n", gInstanceCount, sizeof(*this));
#endif
}
static PRBool DropStyleSheetReference(nsISupports* aElement, void *aData)
{
nsICSSStyleRule *rule = (nsICSSStyleRule *)aElement;
if (nsnull != rule) {
rule->SetStyleSheet(nsnull);
}
return PR_TRUE;
}
CSSStyleSheetImpl::~CSSStyleSheetImpl()
{
#ifdef DEBUG_REFS
--gInstanceCount;
fprintf(stdout, "%d - CSSStyleSheet\n", gInstanceCount);
#endif
if (mFirstChild.IsNotNull()) {
nsICSSStyleSheet* child = mFirstChild;
while (nsnull != child) {
((CSSStyleSheetImpl *)child)->mParent = nsnull;
child = ((CSSStyleSheetImpl*)child)->mNext;
}
}
if (nsnull != mRuleCollection) {
mRuleCollection->DropReference();
NS_RELEASE(mRuleCollection);
}
if (nsnull != mImportsCollection) {
mImportsCollection->DropReference();
NS_RELEASE(mImportsCollection);
}
if (mOrderedRules.IsNotNull()) {
mOrderedRules->EnumerateForwards(DropStyleSheetReference, nsnull);
}
ClearHash();
}
NS_IMPL_ADDREF(CSSStyleSheetImpl)
NS_IMPL_RELEASE(CSSStyleSheetImpl)
nsresult CSSStyleSheetImpl::QueryInterface(const nsIID& aIID,
void** aInstancePtrResult)
{
NS_PRECONDITION(nsnull != aInstancePtrResult, "null pointer");
if (nsnull == aInstancePtrResult) {
return NS_ERROR_NULL_POINTER;
}
static NS_DEFINE_IID(kISupportsIID, NS_ISUPPORTS_IID);
if (aIID.Equals(kICSSStyleSheetIID)) {
*aInstancePtrResult = (void*) ((nsICSSStyleSheet*)this);
NS_ADDREF_THIS();
return NS_OK;
}
if (aIID.Equals(kIStyleSheetIID)) {
*aInstancePtrResult = (void*) ((nsIStyleSheet*)this);
NS_ADDREF_THIS();
return NS_OK;
}
if (aIID.Equals(kIDOMStyleSheetIID)) {
nsIDOMStyleSheet *tmp = this;
*aInstancePtrResult = (void*) tmp;
NS_ADDREF_THIS();
return NS_OK;
}
if (aIID.Equals(kIDOMCSSStyleSheetIID)) {
nsIDOMCSSStyleSheet *tmp = this;
*aInstancePtrResult = (void*) tmp;
NS_ADDREF_THIS();
return NS_OK;
}
if (aIID.Equals(kIScriptObjectOwnerIID)) {
nsIScriptObjectOwner *tmp = this;
*aInstancePtrResult = (void*) tmp;
NS_ADDREF_THIS();
return NS_OK;
}
if (aIID.Equals(kISupportsIID)) {
nsICSSStyleSheet *tmp = this;
nsISupports *tmp2 = tmp;
*aInstancePtrResult = (void*) tmp2;
NS_ADDREF_THIS();
return NS_OK;
}
return NS_NOINTERFACE;
}
static PRBool SelectorMatches(nsIPresContext* aPresContext,
nsCSSSelector* aSelector, nsIContent* aContent)
{
PRBool result = PR_FALSE;
nsIAtom* contentTag;
aContent->GetTag(contentTag);
if ((nsnull == aSelector->mTag) || (aSelector->mTag == contentTag)) {
if ((nsnull != aSelector->mClass) || (nsnull != aSelector->mID) ||
(nsnull != aSelector->mPseudoClass)) {
nsIHTMLContent* htmlContent;
if (NS_OK == aContent->QueryInterface(kIHTMLContentIID, (void**)&htmlContent)) {
nsIAtom* contentClass;
htmlContent->GetClass(contentClass);
nsIAtom* contentID;
htmlContent->GetID(contentID);
if ((nsnull == aSelector->mClass) || (aSelector->mClass == contentClass)) {
if ((nsnull == aSelector->mID) || (aSelector->mID == contentID)) {
if ((contentTag == nsHTMLAtoms::a) && (nsnull != aSelector->mPseudoClass)) {
// test link state
nsILinkHandler* linkHandler;
if ((NS_OK == aPresContext->GetLinkHandler(&linkHandler)) &&
(nsnull != linkHandler)) {
nsAutoString base, href; // XXX base??
nsresult attrState = htmlContent->GetAttribute("href", href);
if (NS_CONTENT_ATTR_HAS_VALUE == attrState) {
nsIURL* docURL = nsnull;
nsIDocument* doc = nsnull;
aContent->GetDocument(doc);
if (nsnull != doc) {
docURL = doc->GetDocumentURL();
NS_RELEASE(doc);
}
nsAutoString absURLSpec;
nsresult rv = NS_MakeAbsoluteURL(docURL, base, href, absURLSpec);
NS_IF_RELEASE(docURL);
nsLinkState state;
if (NS_OK == linkHandler->GetLinkState(absURLSpec, state)) {
switch (state) {
case eLinkState_Unvisited:
result = PRBool (aSelector->mPseudoClass == nsHTMLAtoms::link);
break;
case eLinkState_Visited:
result = PRBool (aSelector->mPseudoClass == nsHTMLAtoms::visited);
break;
case eLinkState_OutOfDate:
result = PRBool (aSelector->mPseudoClass == nsHTMLAtoms::outOfDate);
break;
case eLinkState_Active:
result = PRBool (aSelector->mPseudoClass == nsHTMLAtoms::active);
break;
case eLinkState_Hover:
result = PRBool (aSelector->mPseudoClass == nsHTMLAtoms::hover);
break;
}
}
}
NS_RELEASE(linkHandler);
}
}
else {
result = PR_TRUE;
}
}
}
NS_RELEASE(htmlContent);
NS_IF_RELEASE(contentClass);
NS_IF_RELEASE(contentID);
}
}
else {
result = PR_TRUE;
}
}
NS_IF_RELEASE(contentTag);
return result;
}
struct ContentEnumData {
ContentEnumData(nsIPresContext* aPresContext, nsIContent* aContent,
nsIStyleContext* aParentContext, nsISupportsArray* aResults)
{
mPresContext = aPresContext;
mContent = aContent;
mParentContext = aParentContext;
mResults = aResults;
mCount = 0;
}
nsIPresContext* mPresContext;
nsIContent* mContent;
nsIStyleContext* mParentContext;
nsISupportsArray* mResults;
PRInt32 mCount;
};
static void ContentEnumFunc(nsICSSStyleRule* aRule, void* aData)
{
ContentEnumData* data = (ContentEnumData*)aData;
nsCSSSelector* selector = aRule->FirstSelector();
if (SelectorMatches(data->mPresContext, selector, data->mContent)) {
selector = selector->mNext;
nsIContent* content = nsnull;
nsIContent* lastContent = nsnull;
data->mContent->GetParent(content);
while ((nsnull != selector) && (nsnull != content)) { // check compound selectors
if (SelectorMatches(data->mPresContext, selector, content)) {
selector = selector->mNext;
}
lastContent = content;
content->GetParent(content);
NS_IF_RELEASE(lastContent);
}
NS_IF_RELEASE(lastContent);
if (nsnull == selector) { // ran out, it matched
nsIStyleRule* iRule;
if (NS_OK == aRule->QueryInterface(kIStyleRuleIID, (void**)&iRule)) {
data->mResults->AppendElement(iRule);
data->mCount++;
NS_RELEASE(iRule);
iRule = aRule->GetImportantRule();
if (nsnull != iRule) {
data->mResults->AppendElement(iRule);
data->mCount++;
NS_RELEASE(iRule);
}
}
}
}
}
#ifdef DEBUG_RULES
static PRBool ContentEnumWrap(nsISupports* aRule, void* aData)
{
ContentEnumFunc((nsICSSStyleRule*)aRule, aData);
return PR_TRUE;
}
#endif
PRInt32 CSSStyleSheetImpl::RulesMatching(nsIPresContext* aPresContext,
nsIContent* aContent,
nsIStyleContext* aParentContext,
nsISupportsArray* aResults)
{
NS_PRECONDITION(nsnull != aPresContext, "null arg");
NS_PRECONDITION(nsnull != aContent, "null arg");
NS_PRECONDITION(nsnull != aResults, "null arg");
PRInt32 matchCount = 0;
nsICSSStyleSheet* child = mFirstChild;
while (nsnull != child) {
matchCount += child->RulesMatching(aPresContext, aContent, aParentContext, aResults);
child = ((CSSStyleSheetImpl*)child)->mNext;
}
if (mWeightedRules.IsNotNull()) {
if (nsnull == mRuleHash) {
BuildHash();
}
ContentEnumData data(aPresContext, aContent, aParentContext, aResults);
nsIAtom* tagAtom;
aContent->GetTag(tagAtom);
nsIAtom* idAtom = nsnull;
nsIAtom* classAtom = nsnull;
nsIHTMLContent* htmlContent;
if (NS_OK == aContent->QueryInterface(kIHTMLContentIID, (void**)&htmlContent)) {
htmlContent->GetID(idAtom);
htmlContent->GetClass(classAtom);
NS_RELEASE(htmlContent);
}
mRuleHash->EnumerateAllRules(tagAtom, idAtom, classAtom, ContentEnumFunc, &data);
matchCount += data.mCount;
#ifdef DEBUG_RULES
nsISupportsArray* list1;
nsISupportsArray* list2;
NS_NewISupportsArray(&list1);
NS_NewISupportsArray(&list2);
data.mResults = list1;
mRuleHash->EnumerateAllRules(tagAtom, idAtom, classAtom, ContentEnumFunc, &data);
data.mResults = list2;
mWeightedRules->EnumerateBackwards(ContentEnumWrap, &data);
NS_ASSERTION(list1->Equals(list2), "lists not equal");
NS_RELEASE(list1);
NS_RELEASE(list2);
#endif
NS_IF_RELEASE(tagAtom);
NS_IF_RELEASE(idAtom);
NS_IF_RELEASE(classAtom);
}
return matchCount;
}
struct PseudoEnumData {
PseudoEnumData(nsIPresContext* aPresContext, nsIContent* aParentContent,
nsIAtom* aPseudoTag, nsIStyleContext* aParentContext,
nsISupportsArray* aResults)
{
mPresContext = aPresContext;
mParentContent = aParentContent;
mPseudoTag = aPseudoTag;
mParentContext = aParentContext;
mResults = aResults;
mCount = 0;
}
nsIPresContext* mPresContext;
nsIContent* mParentContent;
nsIAtom* mPseudoTag;
nsIStyleContext* mParentContext;
nsISupportsArray* mResults;
PRInt32 mCount;
};
static void PseudoEnumFunc(nsICSSStyleRule* aRule, void* aData)
{
PseudoEnumData* data = (PseudoEnumData*)aData;
nsCSSSelector* selector = aRule->FirstSelector();
if (selector->mTag == data->mPseudoTag) {
selector = selector->mNext;
nsIContent* content = data->mParentContent;
nsIContent* lastContent = nsnull;
NS_IF_ADDREF(content);
while ((nsnull != selector) && (nsnull != content)) { // check compound selectors
if (SelectorMatches(data->mPresContext, selector, content)) {
selector = selector->mNext;
}
lastContent = content;
content->GetParent(content);
NS_IF_RELEASE(lastContent);
}
NS_IF_RELEASE(lastContent);
if (nsnull == selector) { // ran out, it matched
nsIStyleRule* iRule;
if (NS_OK == aRule->QueryInterface(kIStyleRuleIID, (void**)&iRule)) {
data->mResults->AppendElement(iRule);
data->mCount++;
NS_RELEASE(iRule);
iRule = aRule->GetImportantRule();
if (nsnull != iRule) {
data->mResults->AppendElement(iRule);
data->mCount++;
NS_RELEASE(iRule);
}
}
}
}
}
#ifdef DEBUG_RULES
static PRBool PseudoEnumWrap(nsISupports* aRule, void* aData)
{
PseudoEnumFunc((nsICSSStyleRule*)aRule, aData);
return PR_TRUE;
}
#endif
PRInt32 CSSStyleSheetImpl::RulesMatching(nsIPresContext* aPresContext,
nsIContent* aParentContent,
nsIAtom* aPseudoTag,
nsIStyleContext* aParentContext,
nsISupportsArray* aResults)
{
NS_PRECONDITION(nsnull != aPresContext, "null arg");
NS_PRECONDITION(nsnull != aPseudoTag, "null arg");
NS_PRECONDITION(nsnull != aResults, "null arg");
PRInt32 matchCount = 0;
nsICSSStyleSheet* child = mFirstChild;
while (nsnull != child) {
matchCount += child->RulesMatching(aPresContext, aParentContent, aPseudoTag,
aParentContext, aResults);
child = ((CSSStyleSheetImpl*)child)->mNext;
}
if (mWeightedRules.IsNotNull()) {
if (nsnull == mRuleHash) {
BuildHash();
}
PseudoEnumData data(aPresContext, aParentContent, aPseudoTag, aParentContext, aResults);
mRuleHash->EnumerateTagRules(aPseudoTag, PseudoEnumFunc, &data);
matchCount += data.mCount;
#ifdef DEBUG_RULES
nsISupportsArray* list1;
nsISupportsArray* list2;
NS_NewISupportsArray(&list1);
NS_NewISupportsArray(&list2);
data.mResults = list1;
mRuleHash->EnumerateTagRules(aPseudoTag, PseudoEnumFunc, &data);
data.mResults = list2;
mWeightedRules->EnumerateBackwards(PseudoEnumWrap, &data);
NS_ASSERTION(list1->Equals(list2), "lists not equal");
NS_RELEASE(list1);
NS_RELEASE(list2);
#endif
}
return matchCount;
}
nsIURL* CSSStyleSheetImpl::GetURL(void)
{
return mURL.AddRef();
}
PRBool CSSStyleSheetImpl::ContainsStyleSheet(nsIURL* aURL)
{
NS_PRECONDITION(nsnull != aURL, "null arg");
PRBool result = (*mURL == *aURL);
nsICSSStyleSheet* child = mFirstChild;
while ((PR_FALSE == result) && (nsnull != child)) {
result = child->ContainsStyleSheet(aURL);
child = ((CSSStyleSheetImpl*)child)->mNext;
}
return result;
}
void CSSStyleSheetImpl::AppendStyleSheet(nsICSSStyleSheet* aSheet)
{
NS_PRECONDITION(nsnull != aSheet, "null arg");
if (mFirstChild.IsNull()) {
mFirstChild.SetAddRef(aSheet);
}
else {
nsICSSStyleSheet* child = mFirstChild;
while (((CSSStyleSheetImpl*)child)->mNext.IsNotNull()) {
child = ((CSSStyleSheetImpl*)child)->mNext;
}
((CSSStyleSheetImpl*)child)->mNext.SetAddRef(aSheet);
}
// This is not reference counted. Our parent tells us when
// it's going away.
((CSSStyleSheetImpl*)aSheet)->mParent = this;
}
void CSSStyleSheetImpl::PrependStyleRule(nsICSSStyleRule* aRule)
{
NS_PRECONDITION(nsnull != aRule, "null arg");
ClearHash();
//XXX replace this with a binary search?
PRInt32 weight = aRule->GetWeight();
if (mWeightedRules.IsNull()) {
if (NS_OK != NS_NewISupportsArray(mWeightedRules.AssignPtr()))
return;
}
if (mOrderedRules.IsNull()) {
if (NS_OK != NS_NewISupportsArray(mOrderedRules.AssignPtr()))
return;
}
PRInt32 index = mWeightedRules->Count();
while (0 <= --index) {
nsICSSStyleRule* rule = (nsICSSStyleRule*)mWeightedRules->ElementAt(index);
if (rule->GetWeight() >= weight) { // insert before rules with equal or lesser weight
NS_RELEASE(rule);
break;
}
NS_RELEASE(rule);
}
mWeightedRules->InsertElementAt(aRule, index + 1);
mOrderedRules->InsertElementAt(aRule, 0);
aRule->SetStyleSheet(this);
}
void CSSStyleSheetImpl::AppendStyleRule(nsICSSStyleRule* aRule)
{
NS_PRECONDITION(nsnull != aRule, "null arg");
ClearHash();
//XXX replace this with a binary search?
PRInt32 weight = aRule->GetWeight();
if (mWeightedRules.IsNull()) {
if (NS_OK != NS_NewISupportsArray(mWeightedRules.AssignPtr()))
return;
}
if (mOrderedRules.IsNull()) {
if (NS_OK != NS_NewISupportsArray(mOrderedRules.AssignPtr()))
return;
}
PRInt32 count = mWeightedRules->Count();
PRInt32 index = -1;
while (++index < count) {
nsICSSStyleRule* rule = (nsICSSStyleRule*)mWeightedRules->ElementAt(index);
if (rule->GetWeight() <= weight) { // insert after rules with greater weight (before equal or lower weight)
NS_RELEASE(rule);
break;
}
NS_RELEASE(rule);
}
mWeightedRules->InsertElementAt(aRule, index);
mOrderedRules->AppendElement(aRule);
aRule->SetStyleSheet(this);
}
PRInt32 CSSStyleSheetImpl::StyleRuleCount(void)
{
if (mOrderedRules.IsNotNull()) {
return mOrderedRules->Count();
}
return 0;
}
nsresult CSSStyleSheetImpl::GetStyleRuleAt(PRInt32 aIndex, nsICSSStyleRule*& aRule)
{
nsresult result = NS_ERROR_ILLEGAL_VALUE;
if (mOrderedRules.IsNotNull()) {
aRule = (nsICSSStyleRule*)mOrderedRules->ElementAt(aIndex);
if (nsnull != aRule) {
result = NS_OK;
}
}
else {
aRule = nsnull;
}
return result;
}
PRInt32 CSSStyleSheetImpl::StyleSheetCount()
{
// XXX Far from an ideal way to do this, but the hope is that
// it won't be done too often. If it is, we might want to
// consider storing the children in an array.
PRInt32 count = 0;
if (mFirstChild.IsNotNull()) {
nsICSSStyleSheet* child = mFirstChild;
while (nsnull != child) {
count++;
child = ((CSSStyleSheetImpl*)child)->mNext;
}
}
return count;
}
nsresult CSSStyleSheetImpl::GetStyleSheetAt(PRInt32 aIndex, nsICSSStyleSheet*& aSheet)
{
// XXX Ughh...an O(n^2) method for doing iteration. Again, we hope
// that this isn't done too often. If it is, we need to change the
// underlying storage mechanism
aSheet = nsnull;
if (mFirstChild.IsNotNull()) {
nsICSSStyleSheet* child = mFirstChild;
while ((nsnull != child) && (0 != aIndex)) {
--aIndex;
child = ((CSSStyleSheetImpl*)child)->mNext;
}
aSheet = child;
NS_IF_ADDREF(child);
}
return NS_OK;
}
void CSSStyleSheetImpl::List(FILE* out, PRInt32 aIndent) const
{
nsAutoString buffer;
PRInt32 index;
// Indent
for (index = aIndent; --index >= 0; ) fputs(" ", out);
fputs("CSS Style Sheet: ", out);
mURL->ToString(buffer);
fputs(buffer, out);
fputs("\n", out);
const nsICSSStyleSheet* child = mFirstChild;
while (nsnull != child) {
child->List(out, aIndent + 1);
child = ((CSSStyleSheetImpl*)child)->mNext;
}
PRInt32 count = (mWeightedRules.IsNotNull() ? mWeightedRules->Count() : 0);
for (index = 0; index < count; index++) {
nsICSSStyleRulePtr rule = (nsICSSStyleRule*)mWeightedRules->ElementAt(index);
rule->List(out, aIndent);
}
}
void CSSStyleSheetImpl::ClearHash(void)
{
if (nsnull != mRuleHash) {
delete mRuleHash;
mRuleHash = nsnull;
}
}
PRBool BuildHashEnum(nsISupports* aRule, void* aHash)
{
nsICSSStyleRule* rule = (nsICSSStyleRule*)aRule;
RuleHash* hash = (RuleHash*)aHash;
hash->AppendRule(rule);
return PR_TRUE;
}
void CSSStyleSheetImpl::BuildHash(void)
{
NS_ASSERTION(nsnull == mRuleHash, "clear rule hash first");
mRuleHash = new RuleHash();
if ((nsnull != mRuleHash) && mWeightedRules.IsNotNull()) {
mWeightedRules->EnumerateBackwards(BuildHashEnum, mRuleHash);
}
}
NS_IMETHODIMP
CSSStyleSheetImpl::GetDisabled(PRBool* aDisabled)
{
// XXX TBI
*aDisabled = PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP
CSSStyleSheetImpl::SetDisabled(PRBool aDisabled)
{
// XXX TBI
return NS_OK;
}
NS_IMETHODIMP
CSSStyleSheetImpl::GetReadOnly(PRBool* aReadOnly)
{
// XXX TBI
*aReadOnly = PR_FALSE;
return NS_OK;
}
NS_IMETHODIMP
CSSStyleSheetImpl::GetOwningElement(nsIDOMHTMLElement** aOwningElement)
{
// XXX TBI
*aOwningElement = nsnull;
return NS_OK;
}
NS_IMETHODIMP
CSSStyleSheetImpl::GetParentStyleSheet(nsIDOMCSSStyleSheet** aParentStyleSheet)
{
if (nsnull != mParent) {
return mParent->QueryInterface(kIDOMCSSStyleSheetIID, (void **)aParentStyleSheet);
}
else {
*aParentStyleSheet = nsnull;
return NS_OK;
}
}
NS_IMETHODIMP
CSSStyleSheetImpl::GetHref(nsString& aHref)
{
if (mURL.IsNotNull()) {
mURL->ToString(aHref);
}
else {
aHref.SetLength(0);
}
return NS_OK;
}
NS_IMETHODIMP
CSSStyleSheetImpl::GetTitle(nsString& aTitle)
{
// XX TBI
return NS_OK;
}
NS_IMETHODIMP
CSSStyleSheetImpl::GetImports(nsIDOMStyleSheetCollection** aImports)
{
if (nsnull == mImportsCollection) {
mImportsCollection = new CSSImportsCollectionImpl(this);
if (nsnull == mImportsCollection) {
return NS_ERROR_OUT_OF_MEMORY;
}
NS_ADDREF(mImportsCollection);
}
*aImports = mImportsCollection;
NS_ADDREF(mImportsCollection);
return NS_OK;
}
NS_IMETHODIMP
CSSStyleSheetImpl::GetRules(nsIDOMCSSStyleRuleCollection** aRules)
{
if (nsnull == mRuleCollection) {
mRuleCollection = new CSSStyleRuleCollectionImpl(this);
if (nsnull == mRuleCollection) {
return NS_ERROR_OUT_OF_MEMORY;
}
NS_ADDREF(mRuleCollection);
}
*aRules = mRuleCollection;
NS_ADDREF(mRuleCollection);
return NS_OK;
}
NS_IMETHODIMP
CSSStyleSheetImpl::AddRule(const nsString& aSelector,
const nsString& aDeclaration,
PRUint32 aIndex,
PRUint32* aReturn)
{
nsICSSParser* css;
nsresult result = NS_NewCSSParser(&css);
if (NS_OK == result) {
nsAutoString str;
str.SetString(aSelector);
// XXX Can we assume that the braces aren't there?
str.Append(" { ");
str.Append(aDeclaration);
str.Append(" } ");
nsIUnicharInputStream* input = nsnull;
result = NS_NewStringUnicharInputStream(&input, &str);
if (NS_OK == result) {
nsIStyleSheet *tmp;
css->SetStyleSheet(this);
// XXX Currently, the parser will append the rule to the
// style sheet. We shouldn't ignore the index.
result = css->Parse(input, mURL, tmp);
NS_ASSERTION(tmp = this, "parser incorrectly created a new stylesheet");
NS_RELEASE(input);
*aReturn = mOrderedRules->Count();
}
NS_RELEASE(css);
}
return result;
}
NS_IMETHODIMP
CSSStyleSheetImpl::AddImport(const nsString& aUrl, PRUint32 aIndex, PRUint32* aReturn)
{
nsICSSParser* css;
nsresult result = NS_NewCSSParser(&css);
if (NS_OK == result) {
css->SetStyleSheet(this);
result = css->ProcessImport(aUrl);
}
return result;
}
NS_IMETHODIMP
CSSStyleSheetImpl::RemoveRule(PRUint32 aIndex)
{
nsICSSStyleRule *rule;
rule = (nsICSSStyleRule *)mOrderedRules->ElementAt(aIndex);
if (nsnull != rule) {
mOrderedRules->RemoveElementAt(aIndex);
mWeightedRules->RemoveElement(rule);
rule->SetStyleSheet(nsnull);
NS_RELEASE(rule);
}
return NS_OK;
}
NS_IMETHODIMP
CSSStyleSheetImpl::RemoveImport(PRUint32 aIndex)
{
if (mFirstChild.IsNotNull()) {
nsICSSStyleSheet* prev = nsnull;
nsICSSStyleSheet* child = mFirstChild;
while ((nsnull != child) && (0 != aIndex)) {
prev = child;
child = ((CSSStyleSheetImpl*)child)->mNext;
--aIndex;
}
if ((nsnull != child) && (0 == aIndex)) {
// Hold on to the child while we clean it up
NS_ADDREF(child);
if (nsnull == prev) {
mFirstChild.SetAddRef(((CSSStyleSheetImpl*)child)->mNext);
}
else {
((CSSStyleSheetImpl*)prev)->mNext.SetAddRef(((CSSStyleSheetImpl*)child)->mNext);
}
((CSSStyleSheetImpl*)child)->mNext.SetAddRef(nsnull);
((CSSStyleSheetImpl*)child)->mParent = nsnull;
NS_RELEASE(child);
}
}
return NS_OK;
}
NS_IMETHODIMP
CSSStyleSheetImpl::GetScriptObject(nsIScriptContext *aContext, void** aScriptObject)
{
nsresult res = NS_OK;
nsIScriptGlobalObject *global = aContext->GetGlobalObject();
if (nsnull == mScriptObject) {
nsISupports *supports = (nsISupports *)(nsICSSStyleSheet *)this;
// XXX Should be done through factory
res = NS_NewScriptCSSStyleSheet(aContext,
supports,
(nsISupports *)global,
(void**)&mScriptObject);
}
*aScriptObject = mScriptObject;
NS_RELEASE(global);
return res;
}
NS_IMETHODIMP
CSSStyleSheetImpl::SetScriptObject(void* aScriptObject)
{
mScriptObject = aScriptObject;
return NS_OK;
}
NS_HTML nsresult
NS_NewCSSStyleSheet(nsICSSStyleSheet** aInstancePtrResult, nsIURL* aURL)
{
if (aInstancePtrResult == nsnull) {
return NS_ERROR_NULL_POINTER;
}
CSSStyleSheetImpl *it = new CSSStyleSheetImpl(aURL);
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
return it->QueryInterface(kICSSStyleSheetIID, (void **) aInstancePtrResult);
}
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