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pjs/layout/style/nsCSSLoader.cpp

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30 KiB
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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) 1999 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "nsICSSLoader.h"
#include "nsICSSParser.h"
#include "nsICSSStyleSheet.h"
#include "nsIParser.h"
#include "nsIHTMLContent.h"
#include "nsIDOMNode.h"
#include "nsIStyleSheetLinkingElement.h"
#include "nsIDocument.h"
#include "nsIUnicharStreamLoader.h"
#include "nsIUnicharInputStream.h"
#include "nsHashtable.h"
#include "nsIURL.h"
#include "nsCRT.h"
#include "nsVoidArray.h"
#include "nsISupportsArray.h"
static NS_DEFINE_IID(kICSSLoaderIID, NS_ICSS_LOADER_IID);
//static NS_DEFINE_IID(kICSSParserIID, NS_ICSS_PARSER_IID);
//static NS_DEFINE_IID(kICSSStyleSheetIID, NS_ICSS_STYLE_SHEET_IID);
//static NS_DEFINE_IID(kIStyleSheetIID, NS_ISTYLE_SHEET_IID);
static NS_DEFINE_IID(kIDOMNodeIID, NS_IDOMNODE_IID);
static NS_DEFINE_IID(kIStyleSheetLinkingElementIID, NS_ISTYLESHEETLINKINGELEMENT_IID);
class CSSLoaderImpl;
class URLKey: public nsHashKey {
public:
URLKey(nsIURL* aURL)
: nsHashKey(),
mURL(aURL)
{
NS_ADDREF(mURL);
mHashValue = 0;
PRUnichar* urlStr;
mURL->ToString(&urlStr);
if (urlStr) {
mHashValue = nsCRT::HashValue(urlStr);
delete [] urlStr;
}
}
URLKey(const URLKey& aKey)
: nsHashKey(),
mURL(aKey.mURL),
mHashValue(aKey.mHashValue)
{
NS_ADDREF(mURL);
}
virtual ~URLKey(void)
{
NS_RELEASE(mURL);
}
virtual PRUint32 HashValue(void) const
{
return mHashValue;
}
virtual PRBool Equals(const nsHashKey* aKey) const
{
URLKey* key = (URLKey*)aKey;
return mURL->Equals(key->mURL);
}
virtual nsHashKey *Clone(void) const
{
return new URLKey(*this);
}
nsIURL* mURL;
PRUint32 mHashValue;
};
class SupportsKey: public nsHashKey {
public:
SupportsKey(nsISupports* aSupports)
: nsHashKey(),
mSupports(aSupports)
{ // note: does not hold reference on supports pointer
}
SupportsKey(const SupportsKey& aKey)
: nsHashKey(),
mSupports(aKey.mSupports)
{
}
virtual ~SupportsKey(void)
{
}
virtual PRUint32 HashValue(void) const
{
return (PRUint32)mSupports;
}
virtual PRBool Equals(const nsHashKey* aKey) const
{
SupportsKey* key = (SupportsKey*)aKey;
return PRBool(mSupports == key->mSupports);
}
virtual nsHashKey *Clone(void) const
{
return new SupportsKey(*this);
}
nsISupports* mSupports;
};
struct SheetLoadData {
SheetLoadData(CSSLoaderImpl* aLoader, nsIURL* aURL,
const nsString& aTitle, const nsString& aMedia,
nsIHTMLContent* aOwner, PRInt32 aDocIndex,
nsIParser* aParserToUnblock, PRBool aIsInline);
SheetLoadData(CSSLoaderImpl* aLoader, nsIURL* aURL, const nsString& aMedia,
nsICSSStyleSheet* aParentSheet, PRInt32 aSheetIndex);
~SheetLoadData(void);
CSSLoaderImpl* mLoader;
nsIURL* mURL;
nsString mTitle;
nsString mMedia;
PRInt32 mSheetIndex;
nsIHTMLContent* mOwningElement;
nsIParser* mParserToUnblock;
nsICSSStyleSheet* mParentSheet;
SheetLoadData* mNext;
SheetLoadData* mParentData;
PRUint32 mPendingChildren;
PRBool mIsInline;
};
struct PendingSheetData {
PendingSheetData(nsICSSStyleSheet* aSheet, PRInt32 aDocIndex,
nsIHTMLContent* aElement)
: mSheet(aSheet),
mDocIndex(aDocIndex),
mOwningElement(aElement),
mNotify(PR_FALSE)
{
NS_ADDREF(mSheet);
NS_IF_ADDREF(mOwningElement);
}
~PendingSheetData(void)
{
NS_RELEASE(mSheet);
NS_IF_RELEASE(mOwningElement);
}
nsICSSStyleSheet* mSheet;
PRInt32 mDocIndex;
nsIHTMLContent* mOwningElement;
PRBool mNotify;
};
class CSSLoaderImpl: public nsICSSLoader {
public:
CSSLoaderImpl(void);
virtual ~CSSLoaderImpl(void);
NS_DECL_ISUPPORTS
NS_IMETHOD Init(nsIDocument* aDocument);
NS_IMETHOD SetCaseSensitive(PRBool aCaseSensitive);
NS_IMETHOD SetPreferredSheet(const nsString& aTitle);
NS_IMETHOD GetParserFor(nsICSSStyleSheet* aSheet,
nsICSSParser** aParser);
NS_IMETHOD RecycleParser(nsICSSParser* aParser);
NS_IMETHOD LoadInlineStyle(nsIHTMLContent* aElement,
nsIUnicharInputStream* aIn,
const nsString& aTitle,
const nsString& aMedia,
PRInt32 aIndex,
nsIParser* aParserToUnblock,
PRBool& aCompleted);
NS_IMETHOD LoadStyleLink(nsIHTMLContent* aElement,
nsIURL* aURL,
const nsString& aTitle,
const nsString& aMedia,
PRInt32 aIndex,
nsIParser* aParserToUnblock,
PRBool& aCompleted);
NS_IMETHOD LoadChildSheet(nsICSSStyleSheet* aParentSheet,
nsIURL* aURL,
const nsString& aMedia,
PRInt32 aIndex);
// local helper methods (public for access from statics)
void Cleanup(URLKey& aKey, SheetLoadData* aLoadData);
nsresult SheetComplete(nsICSSStyleSheet* aSheet, SheetLoadData* aLoadData);
nsresult ParseSheet(nsIUnicharInputStream* aIn, SheetLoadData* aLoadData,
PRBool& aCompleted);
void DidLoadStyle(nsIUnicharStreamLoader* aLoader,
nsString& aStyleData,
SheetLoadData* aLoadData,
nsresult aStatus);
nsresult SetMedia(nsICSSStyleSheet* aSheet, const nsString& aMedia);
nsresult PrepareSheet(nsICSSStyleSheet* aSheet, const nsString& aTitle,
const nsString& aMedia);
nsresult AddPendingSheet(nsICSSStyleSheet* aSheet, PRInt32 aDocIndex,
nsIHTMLContent* aElement);
PRBool IsAlternate(const nsString& aTitle);
nsresult InsertSheetInDoc(nsICSSStyleSheet* aSheet, PRInt32 aDocIndex,
nsIHTMLContent* aElement, PRBool aNotify);
nsresult InsertChildSheet(nsICSSStyleSheet* aSheet, nsICSSStyleSheet* aParentSheet,
PRInt32 aIndex);
nsresult LoadSheet(URLKey& aKey, SheetLoadData* aData);
nsIDocument* mDocument; // the document we live for
PRBool mCaseSensitive; // is document CSS case sensitive
nsString mPreferredSheet; // title of preferred sheet
nsISupportsArray* mParsers; // array of CSS parsers
nsHashtable mLoadedSheets; // url to first sheet fully loaded for URL
nsHashtable mLoadingSheets; // all current loads
nsVoidArray mParsingData; // array of data for sheets currently parsing
nsVoidArray mPendingDocSheets; // loaded sheet waiting for doc insertion
nsVoidArray mPendingAlternateSheets; // alternates waiting for load to start
nsHashtable mSheetMapTable; // map to insertion index arrays
};
SheetLoadData::SheetLoadData(CSSLoaderImpl* aLoader, nsIURL* aURL,
const nsString& aTitle, const nsString& aMedia,
nsIHTMLContent* aOwner, PRInt32 aDocIndex,
nsIParser* aParserToUnblock, PRBool aIsInline)
: mLoader(aLoader),
mURL(aURL),
mTitle(aTitle),
mMedia(aMedia),
mOwningElement(aOwner),
mSheetIndex(aDocIndex),
mParserToUnblock(aParserToUnblock),
mParentSheet(nsnull),
mNext(nsnull),
mParentData(nsnull),
mPendingChildren(0),
mIsInline(aIsInline)
{
NS_ADDREF(mLoader);
NS_ADDREF(mURL);
NS_IF_ADDREF(mOwningElement);
NS_IF_ADDREF(mParserToUnblock);
}
SheetLoadData::SheetLoadData(CSSLoaderImpl* aLoader, nsIURL* aURL,
const nsString& aMedia, nsICSSStyleSheet* aParentSheet,
PRInt32 aSheetIndex)
: mLoader(aLoader),
mURL(aURL),
mTitle(),
mMedia(aMedia),
mSheetIndex(aSheetIndex),
mOwningElement(nsnull),
mParserToUnblock(nsnull),
mParentSheet(aParentSheet),
mNext(nsnull),
mParentData(nsnull),
mPendingChildren(0),
mIsInline(PR_FALSE)
{
NS_ADDREF(mLoader);
NS_ADDREF(mURL);
NS_ADDREF(mParentSheet);
}
SheetLoadData::~SheetLoadData(void)
{
NS_RELEASE(mLoader);
NS_RELEASE(mURL);
NS_IF_RELEASE(mOwningElement);
NS_IF_RELEASE(mParserToUnblock);
NS_IF_RELEASE(mParentSheet);
if (mNext) {
delete mNext;
}
}
CSSLoaderImpl::CSSLoaderImpl(void)
{
NS_INIT_REFCNT();
mDocument = nsnull;
mCaseSensitive = PR_FALSE;
mParsers = nsnull;
}
static PRBool ReleaseSheet(nsHashKey* aKey, void* aData, void* aClosure)
{
nsICSSStyleSheet* sheet = (nsICSSStyleSheet*)aData;
NS_RELEASE(sheet);
return PR_TRUE;
}
static PRBool DeleteHashLoadData(nsHashKey* aKey, void* aData, void* aClosure)
{
SheetLoadData* data = (SheetLoadData*)aData;
delete data;
return PR_TRUE;
}
static PRBool DeletePendingData(void* aData, void* aClosure)
{
PendingSheetData* data = (PendingSheetData*)aData;
delete data;
return PR_TRUE;
}
static PRBool DeleteLoadData(void* aData, void* aClosure)
{
SheetLoadData* data = (SheetLoadData*)aData;
delete data;
return PR_TRUE;
}
static PRBool DeleteSheetMap(nsHashKey* aKey, void* aData, void* aClosure)
{
nsVoidArray* map = (nsVoidArray*)aData;
delete map;
return PR_TRUE;
}
CSSLoaderImpl::~CSSLoaderImpl(void)
{
NS_IF_RELEASE(mParsers);
mLoadedSheets.Enumerate(ReleaseSheet);
mLoadingSheets.Enumerate(DeleteHashLoadData);
mPendingDocSheets.EnumerateForwards(DeletePendingData, nsnull);
mPendingAlternateSheets.EnumerateForwards(DeleteLoadData, nsnull);
mSheetMapTable.Enumerate(DeleteSheetMap);
}
NS_IMPL_ISUPPORTS(CSSLoaderImpl, kICSSLoaderIID)
NS_IMETHODIMP
CSSLoaderImpl::Init(nsIDocument* aDocument)
{
NS_ASSERTION(! mDocument, "already initialized");
if (! mDocument) {
mDocument = aDocument;
return NS_OK;
}
return NS_ERROR_ALREADY_INITIALIZED;
}
NS_IMETHODIMP
CSSLoaderImpl::SetCaseSensitive(PRBool aCaseSensitive)
{
mCaseSensitive = aCaseSensitive;
return NS_OK;
}
NS_IMETHODIMP
CSSLoaderImpl::SetPreferredSheet(const nsString& aTitle)
{
mPreferredSheet = aTitle;
// start any pending alternates that aren't alternates anymore
PRInt32 index = 0;
while (index < mPendingAlternateSheets.Count()) { // count will change during loop
SheetLoadData* data = (SheetLoadData*)mPendingAlternateSheets.ElementAt(index);
if (! IsAlternate(data->mTitle)) {
mPendingAlternateSheets.RemoveElementAt(index);
URLKey key(data->mURL);
LoadSheet(key, data); // this may steal pending alternates too
}
else {
index++;
}
}
return NS_OK;
}
NS_IMETHODIMP
CSSLoaderImpl::GetParserFor(nsICSSStyleSheet* aSheet,
nsICSSParser** aParser)
{
NS_ASSERTION(aParser, "null pointer");
if (! aParser) {
return NS_ERROR_NULL_POINTER;
}
nsresult result = NS_OK;
*aParser = nsnull;
if (mParsers) {
PRUint32 count = 0;
mParsers->Count(&count);
if (0 < count--) {
*aParser = (nsICSSParser*)mParsers->ElementAt(count);
mParsers->RemoveElementAt(count);
}
}
if (! *aParser) {
result = NS_NewCSSParser(aParser);
}
if (*aParser) {
(*aParser)->SetCaseSensitive(mCaseSensitive);
if (aSheet) {
(*aParser)->SetStyleSheet(aSheet);
}
(*aParser)->SetChildLoader(this);
}
return result;
}
NS_IMETHODIMP
CSSLoaderImpl::RecycleParser(nsICSSParser* aParser)
{
nsresult result = NS_ERROR_NULL_POINTER;
if (aParser) {
result = NS_OK;
if (! mParsers) {
result = NS_NewISupportsArray(&mParsers);
}
if (mParsers) {
mParsers->AppendElement(aParser);
}
NS_RELEASE(aParser);
}
return result;
}
static void
DoneLoadingStyle(nsIUnicharStreamLoader* aLoader,
nsString& aStyleData,
void* aLoadData,
nsresult aStatus)
{
SheetLoadData* data = (SheetLoadData*)aLoadData;
data->mLoader->DidLoadStyle(aLoader, aStyleData, data, aStatus);
// We added a reference when the loader was created. This
// release should destroy it.
NS_RELEASE(aLoader);
}
static PRBool
InsertPendingSheet(void* aPendingData, void* aLoader)
{
PendingSheetData* data = (PendingSheetData*)aPendingData;
CSSLoaderImpl* loader = (CSSLoaderImpl*)aLoader;
loader->InsertSheetInDoc(data->mSheet, data->mDocIndex,
data->mOwningElement, data->mNotify);
delete data;
return PR_TRUE;
}
static PRBool
AreAllPendingAlternateSheets(void* aPendingData, void* aLoader)
{
PendingSheetData* data = (PendingSheetData*)aPendingData;
CSSLoaderImpl* loader = (CSSLoaderImpl*)aLoader;
nsAutoString title;
data->mSheet->GetTitle(title);
if (loader->IsAlternate(title)) {
return PR_TRUE;
}
return PR_FALSE;
}
void
CSSLoaderImpl::Cleanup(URLKey& aKey, SheetLoadData* aLoadData)
{
// unblock parser
SheetLoadData* data = aLoadData;
do {
if (data->mParentData) {
if (0 == --(data->mParentData->mPendingChildren)) { // all children are done, handle parent
NS_ASSERTION(data->mParentSheet, "bug");
SheetComplete(data->mParentSheet, data->mParentData);
}
}
if (data->mParserToUnblock) {
data->mParserToUnblock->EnableParser(PR_TRUE);
break;
}
data = data->mNext;
} while (data);
if (! aLoadData->mIsInline) { // inline sheets don't go in loading table
mLoadingSheets.Remove(&aKey);
}
// if all loads complete, put pending sheets into doc
if (0 == mLoadingSheets.Count()) {
PRInt32 count = mPendingDocSheets.Count();
if (count) {
if (! mPendingDocSheets.EnumerateForwards(AreAllPendingAlternateSheets, this)) {
PendingSheetData* last = (PendingSheetData*)mPendingDocSheets.ElementAt(count - 1);
last->mNotify = PR_TRUE;
}
mPendingDocSheets.EnumerateForwards(InsertPendingSheet, this);
mPendingDocSheets.Clear();
}
// start pending alternate loads
while (mPendingAlternateSheets.Count()) {
SheetLoadData* data = (SheetLoadData*)mPendingAlternateSheets.ElementAt(0);
mPendingAlternateSheets.RemoveElementAt(0);
URLKey key(data->mURL);
LoadSheet(key, data); // this may pull other pending alternates (with same URL)
}
}
delete aLoadData; // delete data last, it may have last ref on loader...
}
nsresult
CSSLoaderImpl::SheetComplete(nsICSSStyleSheet* aSheet, SheetLoadData* aLoadData)
{
nsresult result = NS_OK;
URLKey key(aLoadData->mURL);
if (! aLoadData->mIsInline) { // don't remember inline sheets
NS_ADDREF(aSheet); // add ref for table
mLoadedSheets.Put(&key, aSheet);
}
SheetLoadData* data = aLoadData;
do { // add to parent sheet, parent doc or pending doc sheet list
PrepareSheet(aSheet, data->mTitle, data->mMedia);
if (data->mParentSheet) {
InsertChildSheet(aSheet, data->mParentSheet, data->mSheetIndex);
}
else {
if (data->mParserToUnblock || data->mIsInline) {
InsertSheetInDoc(aSheet, data->mSheetIndex, data->mOwningElement, PR_TRUE);
}
else {
AddPendingSheet(aSheet, data->mSheetIndex, data->mOwningElement);
}
}
data = data->mNext;
if (data) { // clone sheet for next insertion
nsICSSStyleSheet* clone = nsnull;
result = aSheet->Clone(clone);
NS_RELEASE(aSheet);
if (NS_SUCCEEDED(result)) {
aSheet = clone;
}
}
else {
NS_RELEASE(aSheet);
}
} while (data && aSheet);
Cleanup(key, aLoadData);
return result;
}
nsresult
CSSLoaderImpl::ParseSheet(nsIUnicharInputStream* aIn,
SheetLoadData* aLoadData,
PRBool& aCompleted)
{
nsresult result;
aCompleted = PR_TRUE;
nsICSSStyleSheet* sheet = nsnull;
result = NS_NewCSSStyleSheet(&sheet, aLoadData->mURL);
if (NS_SUCCEEDED(result)) {
nsICSSParser* parser;
result = GetParserFor(sheet, &parser);
if (NS_SUCCEEDED(result)) {
mParsingData.AppendElement(aLoadData);
result = parser->Parse(aIn, aLoadData->mURL, sheet); // this may result in re-entrant load child sheet calls
mParsingData.RemoveElementAt(mParsingData.Count() - 1);
if (NS_SUCCEEDED(result)) {
if (0 == aLoadData->mPendingChildren) { // sheet isn't still loading children
if (aLoadData->mIsInline) {
NS_IF_RELEASE(aLoadData->mParserToUnblock); // don't need to unblock, we're done and won't block
}
SheetComplete(sheet, aLoadData);
}
else { // else sheet is still waiting for children to load, last child will complete it
aCompleted = PR_FALSE;
}
}
RecycleParser(parser);
}
NS_RELEASE(sheet);
}
return result;
}
void
CSSLoaderImpl::DidLoadStyle(nsIUnicharStreamLoader* aLoader,
nsString& aStyleData,
SheetLoadData* aLoadData,
nsresult aStatus)
{
if (NS_SUCCEEDED(aStatus) && (0 < aStyleData.Length())) {
nsresult result;
nsIUnicharInputStream* uin = nsnull;
// wrap the string with the CSS data up in a unicode input stream.
result = NS_NewStringUnicharInputStream(&uin, new nsString(aStyleData));
if (NS_SUCCEEDED(result)) {
// XXX We have no way of indicating failure. Silently fail?
PRBool completed;
result = ParseSheet(uin, aLoadData, completed);
NS_RELEASE(uin);
}
}
else { // load failed, cleanup
URLKey key(aLoadData->mURL);
Cleanup(key, aLoadData);
}
}
typedef PRBool (*nsStringEnumFunc)(const nsString& aSubString, void *aData);
static PRBool EnumerateMediaString(const nsString& aStringList, nsStringEnumFunc aFunc, void* aData)
{
PRBool running = PR_TRUE;
nsAutoString stringList(aStringList); // copy to work buffer
nsAutoString subStr;
stringList.Append(kNullCh); // put an extra null at the end
PRUnichar* start = (PRUnichar*)(const PRUnichar*)stringList.GetUnicode();
PRUnichar* end = start;
while (running && (kNullCh != *start)) {
PRBool quoted = PR_FALSE;
while ((kNullCh != *start) && nsString::IsSpace(*start)) { // skip leading space
start++;
}
if ((kApostrophe == *start) || (kQuote == *start)) { // quoted string
PRUnichar quote = *start++;
quoted = PR_TRUE;
end = start;
while (kNullCh != *end) {
if (quote == *end) { // found closing quote
*end++ = kNullCh; // end string here
while ((kNullCh != *end) && (kComma != *end)) { // keep going until comma
end++;
}
break;
}
end++;
}
}
else { // non-quoted string or ended
end = start;
while ((kNullCh != *end) && (kComma != *end)) { // look for comma
end++;
}
*end = kNullCh; // end string here
}
// truncate at first non letter, digit or hyphen
PRUnichar* test = start;
while (test <= end) {
if ((PR_FALSE == nsString::IsAlpha(*test)) &&
(PR_FALSE == nsString::IsDigit(*test)) && (kMinus != *test)) {
*test = kNullCh;
break;
}
test++;
}
subStr = start;
if (PR_FALSE == quoted) {
subStr.CompressWhitespace(PR_FALSE, PR_TRUE);
}
if (0 < subStr.Length()) {
running = (*aFunc)(subStr, aData);
}
start = ++end;
}
return running;
}
static PRBool MediumEnumFunc(const nsString& aSubString, void* aData)
{
nsIAtom* medium = NS_NewAtom(aSubString);
((nsICSSStyleSheet*)aData)->AppendMedium(medium);
return PR_TRUE;
}
nsresult
CSSLoaderImpl::SetMedia(nsICSSStyleSheet* aSheet, const nsString& aMedia)
{
if (0 < aMedia.Length()) {
EnumerateMediaString(aMedia, MediumEnumFunc, aSheet);
}
return NS_OK;
}
nsresult
CSSLoaderImpl::PrepareSheet(nsICSSStyleSheet* aSheet, const nsString& aTitle,
const nsString& aMedia)
{
nsresult result = SetMedia(aSheet, aMedia);
aSheet->SetTitle(aTitle);
return result;
}
nsresult
CSSLoaderImpl::AddPendingSheet(nsICSSStyleSheet* aSheet, PRInt32 aDocIndex,
nsIHTMLContent* aElement)
{
PendingSheetData* data = new PendingSheetData(aSheet, aDocIndex, aElement);
if (data) {
mPendingDocSheets.AppendElement(data);
return NS_OK;
}
return NS_ERROR_OUT_OF_MEMORY;
}
PRBool
CSSLoaderImpl::IsAlternate(const nsString& aTitle)
{
if (0 < aTitle.Length()) {
return PRBool(! aTitle.EqualsIgnoreCase(mPreferredSheet));
}
return PR_FALSE;
}
nsresult
CSSLoaderImpl::InsertSheetInDoc(nsICSSStyleSheet* aSheet, PRInt32 aDocIndex,
nsIHTMLContent* aElement, PRBool aNotify)
{
if ((! mDocument) || (! aSheet)) {
return NS_ERROR_NULL_POINTER;
}
if (nsnull != aElement) {
nsIDOMNode* domNode = nsnull;
if (NS_SUCCEEDED(aElement->QueryInterface(kIDOMNodeIID, (void**)&domNode))) {
aSheet->SetOwningNode(domNode);
NS_RELEASE(domNode);
}
nsIStyleSheetLinkingElement* element;
if (NS_SUCCEEDED(aElement->QueryInterface(kIStyleSheetLinkingElementIID,
(void**)&element))) {
element->SetStyleSheet(aSheet);
NS_RELEASE(element);
}
}
nsAutoString title;
aSheet->GetTitle(title);
aSheet->SetEnabled(! IsAlternate(title));
SupportsKey key(mDocument);
nsVoidArray* sheetMap = (nsVoidArray*)mSheetMapTable.Get(&key);
if (! sheetMap) {
sheetMap = new nsVoidArray();
if (sheetMap) {
mSheetMapTable.Put(&key, sheetMap);
}
}
if (sheetMap) {
PRInt32 insertIndex = sheetMap->Count();
while (0 <= --insertIndex) {
PRInt32 targetIndex = (PRInt32)sheetMap->ElementAt(insertIndex);
if (targetIndex < aDocIndex) {
mDocument->InsertStyleSheetAt(aSheet, insertIndex + 1, aNotify);
sheetMap->InsertElementAt((void*)aDocIndex, insertIndex + 1);
aSheet = nsnull;
break;
}
}
if (nsnull != aSheet) { // didn't insert yet
mDocument->InsertStyleSheetAt(aSheet, 0, aNotify);
sheetMap->InsertElementAt((void*)aDocIndex, 0);
}
return NS_OK;
}
return NS_ERROR_OUT_OF_MEMORY;
}
nsresult
CSSLoaderImpl::InsertChildSheet(nsICSSStyleSheet* aSheet, nsICSSStyleSheet* aParentSheet,
PRInt32 aIndex)
{
if ((! aParentSheet) || (! aSheet)) {
return NS_ERROR_NULL_POINTER;
}
SupportsKey key(aParentSheet);
nsVoidArray* sheetMap = (nsVoidArray*)mSheetMapTable.Get(&key);
if (! sheetMap) {
sheetMap = new nsVoidArray();
if (sheetMap) {
mSheetMapTable.Put(&key, sheetMap);
}
}
if (sheetMap) {
PRInt32 insertIndex = sheetMap->Count();
while (0 <= --insertIndex) {
PRInt32 targetIndex = (PRInt32)sheetMap->ElementAt(insertIndex);
if (targetIndex < aIndex) {
aParentSheet->InsertStyleSheetAt(aSheet, insertIndex + 1);
sheetMap->InsertElementAt((void*)aIndex, insertIndex + 1);
aSheet = nsnull;
break;
}
}
if (nsnull != aSheet) { // didn't insert yet
aParentSheet->InsertStyleSheetAt(aSheet, 0);
sheetMap->InsertElementAt((void*)aIndex, 0);
}
return NS_OK;
}
return NS_ERROR_OUT_OF_MEMORY;
}
nsresult
CSSLoaderImpl::LoadSheet(URLKey& aKey, SheetLoadData* aData)
{
nsresult result = NS_OK;
SheetLoadData* loadingData = (SheetLoadData*)mLoadingSheets.Get(&aKey);
if (loadingData) { // already loading this sheet, glom on to the load
while (loadingData->mNext) {
loadingData = loadingData->mNext;
}
loadingData->mNext = aData;
}
else { // not loading, go load it
nsIUnicharStreamLoader* loader;
result = NS_NewUnicharStreamLoader(&loader, aKey.mURL, DoneLoadingStyle, aData);
if (NS_SUCCEEDED(result)) {
mLoadingSheets.Put(&aKey, aData);
// grab any pending alternates that have this URL
loadingData = aData;
PRInt32 index = 0;
while (index < mPendingAlternateSheets.Count()) {
SheetLoadData* data = (SheetLoadData*)mPendingAlternateSheets.ElementAt(index);
if (aKey.mURL->Equals(data->mURL)) {
mPendingAlternateSheets.RemoveElementAt(index);
loadingData->mNext = data;
loadingData = data;
}
else {
index++;
}
}
}
}
return result;
}
NS_IMETHODIMP
CSSLoaderImpl::LoadInlineStyle(nsIHTMLContent* aElement,
nsIUnicharInputStream* aIn,
const nsString& aTitle,
const nsString& aMedia,
PRInt32 aDocIndex,
nsIParser* aParserToUnblock,
PRBool& aCompleted)
{
// XXX need to add code to cancel any pending sheets for element
nsresult result = NS_ERROR_NULL_POINTER;
if (aIn) {
nsIURL* docURL;
mDocument->GetBaseURL(docURL);
SheetLoadData* data = new SheetLoadData(this, docURL, aTitle, aMedia,
aElement,
aDocIndex, aParserToUnblock,
PR_TRUE);
result = ParseSheet(aIn, data, aCompleted);
NS_RELEASE(docURL);
}
return result;
}
NS_IMETHODIMP
CSSLoaderImpl::LoadStyleLink(nsIHTMLContent* aElement,
nsIURL* aURL,
const nsString& aTitle,
const nsString& aMedia,
PRInt32 aDocIndex,
nsIParser* aParserToUnblock,
PRBool& aCompleted)
{
// XXX need to add code to cancel any pending sheets for element
nsresult result = NS_ERROR_NULL_POINTER;
aCompleted = PR_TRUE;
if (aURL) {
URLKey key(aURL);
nsICSSStyleSheet* sheet = (nsICSSStyleSheet*)mLoadedSheets.Get(&key);
// XXX need to make sure it hasn't been modified via DOM
// if so, load a new one
if (sheet) { // already have one fully loaded
nsICSSStyleSheet* clone = nsnull;
result = sheet->Clone(clone);
if (NS_SUCCEEDED(result)) {
PrepareSheet(clone, aTitle, aMedia);
if (aParserToUnblock) { // stick it in now, parser is waiting for it
result = InsertSheetInDoc(clone, aDocIndex, aElement, PR_TRUE);
}
else { // add to pending list?
result = AddPendingSheet(clone, aDocIndex, aElement);
}
NS_RELEASE(clone);
}
}
else { // need to load it
SheetLoadData* data = new SheetLoadData(this, aURL, aTitle, aMedia,
aElement, aDocIndex,
aParserToUnblock, PR_FALSE);
if (IsAlternate(aTitle) && mLoadingSheets.Count() &&
(! mLoadingSheets.Get(&key)) && (! aParserToUnblock)) {
// this is an alternate, and we're already loading others, but not loading this, defer it
mPendingAlternateSheets.AppendElement(data);
result = NS_OK;
}
else {
result = LoadSheet(key, data);
}
aCompleted = PR_FALSE;
}
}
return result;
}
NS_IMETHODIMP
CSSLoaderImpl::LoadChildSheet(nsICSSStyleSheet* aParentSheet,
nsIURL* aURL,
const nsString& aMedia,
PRInt32 aIndex)
{
nsresult result = NS_ERROR_NULL_POINTER;
if (aURL) {
URLKey key(aURL);
nsICSSStyleSheet* sheet = (nsICSSStyleSheet*)mLoadedSheets.Get(&key);
// XXX need to verify hasn't been modified via DOM
// otherwise load a new one
if (sheet) { // already have one loaded
nsICSSStyleSheet* clone = nsnull;
result = sheet->Clone(clone);
if (NS_SUCCEEDED(result)) {
SetMedia(clone, aMedia);
result = InsertChildSheet(clone, aParentSheet, aIndex);
NS_RELEASE(clone);
}
}
else {
SheetLoadData* data = new SheetLoadData(this, aURL, aMedia,
aParentSheet, aIndex);
PRInt32 count = mParsingData.Count();
if (count) { // still parsing the parent (expected for @import)
// XXX assert that last parsing == parent sheet
SheetLoadData* parentData = (SheetLoadData*)mParsingData.ElementAt(count - 1);
data->mParentData = parentData;
// verify that sheet doesn't have new child as a parent
do {
if (parentData->mURL->Equals(aURL)) { // houston, we have a loop, blow off this child
data->mParentData = nsnull;
delete data;
return NS_OK;
}
parentData = parentData->mParentData;
} while (parentData);
(data->mParentData->mPendingChildren)++;
}
result = LoadSheet(key, data);
}
}
return result;
}
nsresult NS_NewCSSLoader(nsIDocument* aDocument, nsICSSLoader** aLoader)
{
CSSLoaderImpl* it = new CSSLoaderImpl();
if (it == nsnull) {
return NS_ERROR_OUT_OF_MEMORY;
}
it->Init(aDocument);
return it->QueryInterface(kICSSLoaderIID, (void **)aLoader);
}
nsresult NS_NewCSSLoader(nsICSSLoader** aLoader)
{
CSSLoaderImpl* it = new CSSLoaderImpl();
if (it == nsnull) {
return NS_ERROR_OUT_OF_MEMORY;
}
return it->QueryInterface(kICSSLoaderIID, (void **)aLoader);
}
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