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gecko-dev/layout/style/nsCSSLoader.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) 1999 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* This Original Code has been modified by IBM Corporation. Modifications made by IBM
* described herein are Copyright (c) International Business Machines Corporation, 2000.
* Modifications to Mozilla code or documentation identified per MPL Section 3.3
*
* Date Modified by Description of modification
* 04/20/2000 IBM Corp. OS/2 VisualAge build.
*/
#include "nsICSSLoader.h"
#include "nsICSSLoaderObserver.h"
#include "nsICSSParser.h"
#include "nsICSSStyleSheet.h"
#include "nsIParser.h"
#include "nsIContent.h"
#include "nsIDOMNode.h"
#include "nsIStyleSheetLinkingElement.h"
#include "nsIDocument.h"
#include "nsINameSpaceManager.h"
#include "nsIStreamLoader.h"
#include "nsIUnicharInputStream.h"
#include "nsIConverterInputStream.h"
#include "nsICharsetConverterManager.h"
#include "nsIUnicodeDecoder.h"
#include "nsICharsetAlias.h"
#include "nsHashtable.h"
#include "nsIURL.h"
#include "nsIURL.h"
#include "nsIServiceManager.h"
#include "nsNetUtil.h"
#include "nsCRT.h"
#include "nsVoidArray.h"
#include "nsISupportsArray.h"
#include "nsCOMPtr.h"
#include "nsIScriptSecurityManager.h"
#include "nsITimelineService.h"
#include "nsIHttpChannel.h"
#include "nsHTMLAtoms.h"
#ifdef INCLUDE_XUL
#include "nsIXULPrototypeCache.h"
#endif
#include "nsIDOMMediaList.h"
#include "nsIDOMStyleSheet.h"
static NS_DEFINE_CID(kCharsetConverterManagerCID, NS_ICHARSETCONVERTERMANAGER_CID);
class CSSLoaderImpl;
MOZ_DECL_CTOR_COUNTER(URLKey)
class URLKey: public nsHashKey {
public:
URLKey(nsIURI* aURL)
: nsHashKey(),
mURL(aURL),
mSpec(nsnull)
{
MOZ_COUNT_CTOR(URLKey);
NS_ADDREF(mURL);
mHashValue = 0;
mURL->GetSpec((char **)&mSpec);
if (mSpec) {
mHashValue = nsCRT::HashCode(mSpec);
}
}
URLKey(const URLKey& aKey)
: nsHashKey(),
mURL(aKey.mURL),
mHashValue(aKey.mHashValue),
mSpec(nsnull)
{
MOZ_COUNT_CTOR(URLKey);
NS_ADDREF(mURL);
if (aKey.mSpec)
mSpec = nsCRT::strdup(aKey.mSpec);
}
virtual ~URLKey(void)
{
MOZ_COUNT_DTOR(URLKey);
NS_RELEASE(mURL);
if (mSpec)
nsCRT::free((char *)mSpec);
mSpec = nsnull;
}
virtual PRUint32 HashCode(void) const
{
return mHashValue;
}
virtual PRBool Equals(const nsHashKey* aKey) const
{
URLKey* key = (URLKey*)aKey;
#if 0 // bug 47846
PRBool equals = PR_FALSE;
nsresult result = mURL->Equals(key->mURL, &equals);
return (NS_SUCCEEDED(result) && equals);
#else
return (nsCRT::strcasecmp(mSpec, key->mSpec) == 0);
#endif
}
virtual nsHashKey *Clone(void) const
{
return new URLKey(*this);
}
nsIURI* mURL;
PRUint32 mHashValue;
const char* mSpec;
};
class SheetLoadData : public nsIStreamLoaderObserver
{
public:
virtual ~SheetLoadData(void);
SheetLoadData(CSSLoaderImpl* aLoader, nsIURI* aURL,
const nsString& aTitle, const nsString& aMedia,
PRInt32 aDefaultNameSpaceID,
nsIContent* aOwner, PRInt32 aDocIndex,
nsIParser* aParserToUnblock, PRBool aIsInline,
nsICSSLoaderObserver* aObserver);
SheetLoadData(CSSLoaderImpl* aLoader, nsIURI* aURL, const nsString& aMedia,
PRInt32 aDefaultNameSpaceID,
nsICSSStyleSheet* aParentSheet, PRInt32 aSheetIndex,
nsICSSImportRule* aParentRule);
SheetLoadData(CSSLoaderImpl* aLoader, nsIURI* aURL,
nsICSSLoaderObserver* aObserver);
NS_DECL_ISUPPORTS
NS_DECL_NSISTREAMLOADEROBSERVER
CSSLoaderImpl* mLoader;
nsIURI* mURL;
nsString mTitle;
nsString mMedia;
PRInt32 mDefaultNameSpaceID;
PRInt32 mSheetIndex;
nsIContent* mOwningElement;
nsIParser* mParserToUnblock;
PRBool mDidBlockParser;
nsICSSStyleSheet* mParentSheet;
nsICSSImportRule* mParentRule;
SheetLoadData* mNext;
SheetLoadData* mParentData;
PRUint32 mPendingChildren;
PRBool mIsInline;
PRBool mIsAgent;
PRBool mSyncLoad;
nsICSSLoaderObserver* mObserver;
};
NS_IMPL_ISUPPORTS1(SheetLoadData, nsIStreamLoaderObserver);
MOZ_DECL_CTOR_COUNTER(PendingSheetData)
struct PendingSheetData {
PendingSheetData(nsICSSStyleSheet* aSheet, PRInt32 aDocIndex,
nsIContent* aElement, nsICSSLoaderObserver* aObserver)
: mSheet(aSheet),
mDocIndex(aDocIndex),
mOwningElement(aElement),
mNotify(PR_FALSE),
mObserver(aObserver)
{
MOZ_COUNT_CTOR(PendingSheetData);
NS_ADDREF(mSheet);
NS_IF_ADDREF(mOwningElement);
NS_IF_ADDREF(mObserver);
}
~PendingSheetData(void)
{
MOZ_COUNT_DTOR(PendingSheetData);
NS_RELEASE(mSheet);
NS_IF_RELEASE(mOwningElement);
NS_IF_RELEASE(mObserver);
}
nsICSSStyleSheet* mSheet;
PRInt32 mDocIndex;
nsIContent* mOwningElement;
PRBool mNotify;
nsICSSLoaderObserver* mObserver;
};
class CSSLoaderImpl: public nsICSSLoader {
public:
CSSLoaderImpl(void);
virtual ~CSSLoaderImpl(void);
NS_DECL_ISUPPORTS
NS_IMETHOD Init(nsIDocument* aDocument);
NS_IMETHOD DropDocumentReference(void);
NS_IMETHOD SetCaseSensitive(PRBool aCaseSensitive);
NS_IMETHOD SetQuirkMode(PRBool aQuirkMode);
NS_IMETHOD SetPreferredSheet(const nsAReadableString& aTitle);
NS_IMETHOD GetParserFor(nsICSSStyleSheet* aSheet,
nsICSSParser** aParser);
NS_IMETHOD RecycleParser(nsICSSParser* aParser);
NS_IMETHOD LoadInlineStyle(nsIContent* aElement,
nsIUnicharInputStream* aIn,
const nsString& aTitle,
const nsString& aMedia,
PRInt32 aDefaultNameSpaceID,
PRInt32 aIndex,
nsIParser* aParserToUnblock,
PRBool& aCompleted,
nsICSSLoaderObserver* aObserver);
NS_IMETHOD LoadStyleLink(nsIContent* aElement,
nsIURI* aURL,
const nsString& aTitle,
const nsString& aMedia,
PRInt32 aDefaultNameSpaceID,
PRInt32 aIndex,
nsIParser* aParserToUnblock,
PRBool& aCompleted,
nsICSSLoaderObserver* aObserver);
NS_IMETHOD LoadChildSheet(nsICSSStyleSheet* aParentSheet,
nsIURI* aURL,
const nsString& aMedia,
PRInt32 aDefaultNameSpaceID,
PRInt32 aIndex,
nsICSSImportRule* aRule);
NS_IMETHOD LoadAgentSheet(nsIURI* aURL,
nsICSSStyleSheet*& aSheet,
PRBool& aCompleted,
nsICSSLoaderObserver* aObserver);
// 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, nsICSSStyleSheet*& aSheet);
void DidLoadStyle(nsIStreamLoader* aLoader,
nsString* aStyleData, // takes ownership, will delete when done
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,
nsIContent* aElement,
nsICSSLoaderObserver* aObserver);
PRBool IsAlternate(const nsString& aTitle);
nsresult InsertSheetInDoc(nsICSSStyleSheet* aSheet, PRInt32 aDocIndex,
nsIContent* aElement, PRBool aNotify,
nsICSSLoaderObserver* aObserver);
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
PRBool mNavQuirkMode; // should CSS be in quirk mode
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
// mParsingData is (almost?) always needed, so create with storage
nsAutoVoidArray 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
// @charset support
nsString mCharset; // the charset we are using
NS_IMETHOD GetCharset(/*out*/nsAString &aCharsetDest) const; // PUBLIC
NS_IMETHOD SetCharset(/*in*/ const nsAString &aCharsetSrc); // PUBLIC
// public method for clients to set the charset if they know it
// NOTE: the SetCharset method will always get the preferred
// charset from the charset passed in unless it is the
// emptystring, which causes the default charset (that of the
// document, falling back to ISO-8869-1) to be set
nsresult SetCharset(/*in*/ const char* aStyleSheetData,
/*in*/ PRUint32 aDataLength);
// sets the charset based upon the data passed in
// - if the StyleSheetData is not empty and it has '@charset'
// as the first substring, then use that
// - otherwise return an error
// stop loading all sheets
NS_IMETHOD Stop(void);
// stop loading one sheet
NS_IMETHOD StopLoadingSheet(nsIURI* aURL);
#ifdef NS_DEBUG
PRBool mSyncCallback;
#endif
};
SheetLoadData::SheetLoadData(CSSLoaderImpl* aLoader, nsIURI* aURL,
const nsString& aTitle, const nsString& aMedia,
PRInt32 aDefaultNameSpaceID,
nsIContent* aOwner, PRInt32 aDocIndex,
nsIParser* aParserToUnblock, PRBool aIsInline,
nsICSSLoaderObserver* aObserver)
: mLoader(aLoader),
mURL(aURL),
mTitle(aTitle),
mMedia(aMedia),
mDefaultNameSpaceID(aDefaultNameSpaceID),
mSheetIndex(aDocIndex),
mOwningElement(aOwner),
mParserToUnblock(aParserToUnblock),
mDidBlockParser(PR_FALSE),
mParentSheet(nsnull),
mParentRule(nsnull),
mNext(nsnull),
mParentData(nsnull),
mPendingChildren(0),
mIsInline(aIsInline),
mIsAgent(PR_FALSE),
mSyncLoad(PR_FALSE),
mObserver(aObserver)
{
NS_INIT_REFCNT();
NS_ADDREF(mLoader);
NS_ADDREF(mURL);
NS_IF_ADDREF(mOwningElement);
NS_IF_ADDREF(mParserToUnblock);
NS_IF_ADDREF(mObserver);
}
SheetLoadData::SheetLoadData(CSSLoaderImpl* aLoader, nsIURI* aURL,
const nsString& aMedia,
PRInt32 aDefaultNameSpaceID,
nsICSSStyleSheet* aParentSheet,
PRInt32 aSheetIndex,
nsICSSImportRule* aParentRule)
: mLoader(aLoader),
mURL(aURL),
mTitle(),
mMedia(aMedia),
mDefaultNameSpaceID(aDefaultNameSpaceID),
mSheetIndex(aSheetIndex),
mOwningElement(nsnull),
mParserToUnblock(nsnull),
mDidBlockParser(PR_FALSE),
mParentSheet(aParentSheet),
mParentRule(aParentRule),
mNext(nsnull),
mParentData(nsnull),
mPendingChildren(0),
mIsInline(PR_FALSE),
mIsAgent(PR_FALSE),
mSyncLoad(PR_FALSE),
mObserver(nsnull)
{
NS_INIT_REFCNT();
NS_ADDREF(mLoader);
NS_ADDREF(mURL);
NS_ADDREF(mParentSheet);
NS_ADDREF(mParentRule);
}
SheetLoadData::SheetLoadData(CSSLoaderImpl* aLoader, nsIURI* aURL,
nsICSSLoaderObserver* aObserver)
: mLoader(aLoader),
mURL(aURL),
mTitle(),
mMedia(),
mDefaultNameSpaceID(kNameSpaceID_Unknown),
mSheetIndex(-1),
mOwningElement(nsnull),
mParserToUnblock(nsnull),
mDidBlockParser(PR_FALSE),
mParentSheet(nsnull),
mParentRule(nsnull),
mNext(nsnull),
mParentData(nsnull),
mPendingChildren(0),
mIsInline(PR_FALSE),
mIsAgent(PR_TRUE),
mSyncLoad(PRBool(nsnull == aObserver)),
mObserver(aObserver)
{
NS_INIT_REFCNT();
NS_ADDREF(mLoader);
NS_ADDREF(mURL);
NS_IF_ADDREF(mObserver);
}
SheetLoadData::~SheetLoadData(void)
{
NS_RELEASE(mLoader);
NS_RELEASE(mURL);
NS_IF_RELEASE(mOwningElement);
NS_IF_RELEASE(mParserToUnblock);
NS_IF_RELEASE(mParentSheet);
NS_IF_RELEASE(mParentRule);
NS_IF_RELEASE(mObserver);
NS_IF_RELEASE(mNext);
}
CSSLoaderImpl::CSSLoaderImpl(void)
{
NS_INIT_REFCNT();
mDocument = nsnull;
mCaseSensitive = PR_FALSE;
mNavQuirkMode = PR_FALSE;
mParsers = nsnull;
SetCharset(NS_LITERAL_STRING(""));
}
static PRBool PR_CALLBACK ReleaseSheet(nsHashKey* aKey, void* aData, void* aClosure)
{
nsICSSStyleSheet* sheet = (nsICSSStyleSheet*)aData;
NS_RELEASE(sheet);
return PR_TRUE;
}
static PRBool PR_CALLBACK DeleteHashLoadData(nsHashKey* aKey, void* aData, void* aClosure)
{
SheetLoadData* data = (SheetLoadData*)aData;
NS_RELEASE(data);
return PR_TRUE;
}
static PRBool PR_CALLBACK DeletePendingData(void* aData, void* aClosure)
{
PendingSheetData* data = (PendingSheetData*)aData;
delete data;
return PR_TRUE;
}
static PRBool PR_CALLBACK DeleteLoadData(void* aData, void* aClosure)
{
SheetLoadData* data = (SheetLoadData*)aData;
NS_RELEASE(data);
return PR_TRUE;
}
static PRBool PR_CALLBACK DeleteSheetMap(nsHashKey* aKey, void* aData, void* aClosure)
{
nsAutoVoidArray* map = (nsAutoVoidArray*)aData;
delete map;
return PR_TRUE;
}
CSSLoaderImpl::~CSSLoaderImpl(void)
{
if (mLoadingSheets.Count() > 0) {
Stop();
}
NS_IF_RELEASE(mParsers);
mLoadedSheets.Enumerate(ReleaseSheet);
mLoadingSheets.Enumerate(DeleteHashLoadData);
mPendingDocSheets.EnumerateForwards(DeletePendingData, nsnull);
mPendingAlternateSheets.EnumerateForwards(DeleteLoadData, nsnull);
mSheetMapTable.Enumerate(DeleteSheetMap);
}
NS_IMPL_ISUPPORTS1(CSSLoaderImpl, nsICSSLoader)
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::DropDocumentReference(void)
{
mDocument = nsnull;
return NS_OK;
}
NS_IMETHODIMP
CSSLoaderImpl::SetCaseSensitive(PRBool aCaseSensitive)
{
mCaseSensitive = aCaseSensitive;
return NS_OK;
}
NS_IMETHODIMP
CSSLoaderImpl::SetQuirkMode(PRBool aQuirkMode)
{
mNavQuirkMode = aQuirkMode;
return NS_OK;
}
NS_IMETHODIMP
CSSLoaderImpl::SetPreferredSheet(const nsAReadableString& 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);
(*aParser)->SetQuirkMode(mNavQuirkMode);
(*aParser)->SetCharset(mCharset);
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);
}
}
return result;
}
NS_IMETHODIMP
SheetLoadData::OnStreamComplete(nsIStreamLoader* aLoader,
nsISupports* aContext,
nsresult aStatus,
PRUint32 aStringLen,
const char* aString)
{
NS_TIMELINE_OUTDENT();
NS_TIMELINE_MARK_LOADER("SheetLoadData::OnStreamComplete(%s)", aLoader);
nsresult result = NS_OK;
nsString *strUnicodeBuffer = nsnull;
if (aString && aStringLen>0) {
nsCOMPtr<nsIRequest> request;
aLoader->GetRequest(getter_AddRefs(request));
nsXPIDLCString contentType;
if (! (mLoader->mNavQuirkMode)) {
nsCOMPtr<nsIChannel> channel(do_QueryInterface(request));
if (channel) {
channel->GetContentType(getter_Copies(contentType));
}
}
if (mLoader->mNavQuirkMode ||
Compare(contentType,
NS_LITERAL_CSTRING("text/css"),
nsCaseInsensitiveCStringComparator()) == 0 ||
contentType.IsEmpty()) {
/*
* First determine the charset (if one is indicated)
* 1) Check HTTP charset
* 2) Check @charset rules
* 3) Check "charset" attribute of the <LINK> or <?xml-stylesheet?>
*
* If all these fail to give us a charset, fall back on our
* default (document charset or ISO-8859-1 if we have no document
* charset)
*/
nsAutoString strHTTPCharset;
nsCOMPtr<nsIHttpChannel> httpChannel = do_QueryInterface(request);
if (httpChannel) {
nsXPIDLCString httpCharset;
httpChannel->GetCharset(getter_Copies(httpCharset));
CopyASCIItoUCS2(httpCharset, strHTTPCharset);
}
result = NS_ERROR_NOT_AVAILABLE;
if (! strHTTPCharset.IsEmpty()) {
result = mLoader->SetCharset(strHTTPCharset);
}
if (NS_FAILED(result)) {
// We have no charset or the HTTP charset is not recognized.
// Try @charset rules
result = mLoader->SetCharset(aString, aStringLen);
}
if (NS_FAILED(result)) {
// Now try the charset on the <link> or processing instruction
// that loaded us
nsCOMPtr<nsIStyleSheetLinkingElement>
element(do_QueryInterface(mOwningElement));
if (element) {
nsAutoString linkCharset;
element->GetCharset(linkCharset);
if (! linkCharset.IsEmpty()) {
result = mLoader->SetCharset(linkCharset);
}
}
}
if (NS_FAILED(result)) {
// no useful data on charset. Just set to empty string, and let
// SetCharset pick a sane default
mLoader->SetCharset(NS_LITERAL_STRING(""));
}
{
// now get the decoder
nsCOMPtr<nsICharsetConverterManager> ccm =
do_GetService(kCharsetConverterManagerCID, &result);
if (NS_SUCCEEDED(result) && ccm) {
nsString charset;
mLoader->GetCharset(charset);
nsIUnicodeDecoder *decoder = nsnull;
ccm->GetUnicodeDecoder(&charset,&decoder);
if (decoder) {
PRInt32 unicodeLength=0;
if (NS_SUCCEEDED(decoder->GetMaxLength(aString,aStringLen,&unicodeLength))) {
PRUnichar *unicodeString = nsnull;
strUnicodeBuffer = new nsString;
if (nsnull == strUnicodeBuffer) {
result = NS_ERROR_OUT_OF_MEMORY;
} else {
// make space for the decoding
strUnicodeBuffer->SetCapacity(unicodeLength);
unicodeString = (PRUnichar *) strUnicodeBuffer->get();
result = decoder->Convert(aString, (PRInt32 *) &aStringLen, unicodeString, &unicodeLength);
if (NS_SUCCEEDED(result)) {
strUnicodeBuffer->SetLength(unicodeLength);
} else {
strUnicodeBuffer->SetLength(0);
}
}
}
NS_RELEASE(decoder);
}
}
}
}
}
mLoader->DidLoadStyle(aLoader, strUnicodeBuffer, this, aStatus);
// NOTE: passed ownership of strUnicodeBuffer to mLoader in the call,
// so nulling it out for clarity / safety
strUnicodeBuffer = nsnull;
// We added a reference when the loader was created. This
// release should destroy it.
NS_RELEASE(aLoader);
return result;
}
static PRBool PR_CALLBACK
InsertPendingSheet(void* aPendingData, void* aLoader)
{
PendingSheetData* data = (PendingSheetData*)aPendingData;
CSSLoaderImpl* loader = (CSSLoaderImpl*)aLoader;
loader->InsertSheetInDoc(data->mSheet, data->mDocIndex,
data->mOwningElement, data->mNotify,
data->mObserver);
delete data;
return PR_TRUE;
}
static PRBool PR_CALLBACK
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)
{
// notify any parents that child is done
SheetLoadData* data = aLoadData;
do {
if (data->mParentData) {
if (0 == --(data->mParentData->mPendingChildren)) { // all children are done, handle parent
NS_ASSERTION(data->mParentSheet, "bug");
if (! data->mSyncLoad) {
SheetComplete(data->mParentSheet, data->mParentData);
}
}
}
data = data->mNext;
} while (data);
if (! aLoadData->mIsInline) { // inline sheets don't go in loading table
SheetLoadData* oldData = (SheetLoadData*)mLoadingSheets.Remove(&aKey);
NS_ASSERTION(oldData == aLoadData, "broken loading table");
}
// release all parsers, but we only need to unblock one
data = aLoadData;
PRBool done = PR_FALSE;
do {
if (data->mParserToUnblock) {
if (!done && data->mDidBlockParser) {
done = PR_TRUE;
data->mParserToUnblock->ContinueParsing(); // this may result in re-entrant calls to loader
}
// To reduce the risk of leaking a parser if we leak a SheetLoadData,
// release the parser here.
NS_RELEASE(data->mParserToUnblock); // assigns nsnull
}
data = data->mNext;
} while (data);
// 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()) {
data = (SheetLoadData*)mPendingAlternateSheets.ElementAt(0);
mPendingAlternateSheets.RemoveElementAt(0);
URLKey key(data->mURL);
LoadSheet(key, data); // this may pull other pending alternates (with same URL)
}
}
NS_RELEASE(aLoadData); // delete data last, it may have last ref on loader...
}
#ifdef INCLUDE_XUL
static PRBool IsChromeURI(nsIURI* aURI)
{
NS_ASSERTION(aURI, "bad caller");
PRBool isChrome = PR_FALSE;
aURI->SchemeIs("chrome", &isChrome);
return isChrome;
}
#endif
nsresult
CSSLoaderImpl::SheetComplete(nsICSSStyleSheet* aSheet, SheetLoadData* aLoadData)
{
#ifdef INCLUDE_XUL
if (IsChromeURI(aLoadData->mURL)) {
nsCOMPtr<nsIXULPrototypeCache> cache(do_GetService("@mozilla.org/xul/xul-prototype-cache;1"));
if (cache) {
PRBool enabled;
cache->GetEnabled(&enabled);
if (enabled) {
nsCOMPtr<nsICSSStyleSheet> sheet;
cache->GetStyleSheet(aLoadData->mURL, getter_AddRefs(sheet));
if (!sheet) {
cache->PutStyleSheet(aSheet);
aSheet->SetModified(PR_FALSE); // We're clean.
}
}
}
}
#endif
nsresult result = NS_OK;
URLKey key(aLoadData->mURL);
if (! aLoadData->mIsInline) { // don't remember inline sheets
NS_ADDREF(aSheet); // add ref for table
nsICSSStyleSheet* oldSheet = (nsICSSStyleSheet*)mLoadedSheets.Put(&key, aSheet);
NS_IF_RELEASE(oldSheet); // relase predecessor (was dirty)
}
SheetLoadData* data = aLoadData;
do { // add to parent sheet, parent doc or pending doc sheet list
PrepareSheet(aSheet, data->mTitle, data->mMedia);
if (data->mParentSheet) { // is child sheet
InsertChildSheet(aSheet, data->mParentSheet, data->mSheetIndex);
if (data->mParentRule) { // we have the @import rule that loaded this sheet
data->mParentRule->SetSheet(aSheet);
}
}
else if (data->mIsAgent) { // is agent sheet
if (data->mObserver) {
data->mObserver->StyleSheetLoaded(aSheet, PR_FALSE);
}
}
else { // doc sheet
if (data->mParserToUnblock) { // if blocking, insert it immediately
InsertSheetInDoc(aSheet, data->mSheetIndex, data->mOwningElement, PR_TRUE, data->mObserver);
}
else { // otherwise wait until all are loaded (even inlines)
AddPendingSheet(aSheet, data->mSheetIndex, data->mOwningElement, data->mObserver);
}
}
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,
nsICSSStyleSheet*& aSheet)
{
nsresult result;
PRBool failed = PR_TRUE;
aCompleted = PR_TRUE;
aSheet = nsnull;
result = NS_NewCSSStyleSheet(&aSheet, aLoadData->mURL);
if (NS_SUCCEEDED(result)) {
nsCOMPtr<nsICSSParser> parser;
result = GetParserFor(aSheet, getter_AddRefs(parser));
if (NS_SUCCEEDED(result)) {
mParsingData.AppendElement(aLoadData);
if (kNameSpaceID_Unknown != aLoadData->mDefaultNameSpaceID) {
aSheet->SetDefaultNameSpaceID(aLoadData->mDefaultNameSpaceID);
}
result = parser->Parse(aIn, aLoadData->mURL, aSheet); // this may result in re-entrant load child sheet calls
mParsingData.RemoveElementAt(mParsingData.Count() - 1);
if (NS_SUCCEEDED(result)) {
aSheet->SetModified(PR_FALSE); // make it clean from the load
failed = PR_FALSE;
if (0 == aLoadData->mPendingChildren) { // sheet isn't still loading children
if (aLoadData->mIsInline) {
aLoadData->mDidBlockParser = PR_FALSE; // don't need to unblock, we're done and won't block
}
SheetComplete(aSheet, aLoadData);
}
else { // else sheet is still waiting for children to load, last child will complete it
aCompleted = PR_FALSE;
}
}
RecycleParser(parser);
}
}
if (failed) {
URLKey key(aLoadData->mURL);
Cleanup(key, aLoadData);
}
return result;
}
void
CSSLoaderImpl::DidLoadStyle(nsIStreamLoader* aLoader,
nsString* aStyleData,
SheetLoadData* aLoadData,
nsresult aStatus)
{
#ifdef NS_DEBUG
NS_ASSERTION(! mSyncCallback, "getting synchronous callback from netlib");
#endif
if (NS_SUCCEEDED(aStatus) && (aStyleData) && (0 < aStyleData->Length()) && (mDocument)) {
nsresult result;
nsIUnicharInputStream* uin = nsnull;
// wrap the string with the CSS data up in a unicode input stream.
result = NS_NewStringUnicharInputStream(&uin, aStyleData);
if (NS_SUCCEEDED(result)) {
// XXX We have no way of indicating failure. Silently fail?
PRBool completed;
nsICSSStyleSheet* sheet;
result = ParseSheet(uin, aLoadData, completed, sheet);
NS_IF_RELEASE(sheet);
NS_IF_RELEASE(uin);
}
else {
URLKey key(aLoadData->mURL);
Cleanup(key, aLoadData);
}
}
else { // load failed or document now gone, cleanup
#ifdef DEBUG
if (mDocument && NS_FAILED(aStatus)) { // still have doc, must have failed
// Dump error message to console.
nsXPIDLCString url;
aLoadData->mURL->GetSpec(getter_Copies(url));
nsCAutoString errorMessage(NS_LITERAL_CSTRING("CSSLoaderImpl::DidLoadStyle: Load of URL '") +
nsDependentCString(url) +
NS_LITERAL_CSTRING("' failed. Error code: "));
errorMessage.AppendInt(NS_ERROR_GET_CODE(aStatus));
NS_WARNING(errorMessage.get());
}
#endif
URLKey key(aLoadData->mURL);
Cleanup(key, aLoadData);
}
}
typedef nsresult (*nsStringEnumFunc)(const nsString& aSubString, void *aData);
static nsresult EnumerateMediaString(const nsString& aStringList, nsStringEnumFunc aFunc, void* aData)
{
nsresult status = NS_OK;
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.get();
PRUnichar* end = start;
while (NS_SUCCEEDED(status) && (kNullCh != *start)) {
PRBool quoted = PR_FALSE;
while ((kNullCh != *start) && nsCRT::IsAsciiSpace(*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 == nsCRT::IsAsciiAlpha(*test)) &&
(PR_FALSE == nsCRT::IsAsciiDigit(*test)) && (kMinus != *test)) {
*test = kNullCh;
break;
}
test++;
}
subStr = start;
if (PR_FALSE == quoted) {
subStr.CompressWhitespace(PR_FALSE, PR_TRUE);
}
if (0 < subStr.Length()) {
status = (*aFunc)(subStr, aData);
}
start = ++end;
}
return status;
}
static nsresult MediumEnumFunc(const nsString& aSubString, void* aData)
{
nsIAtom* medium = NS_NewAtom(aSubString);
if (!medium) return NS_ERROR_OUT_OF_MEMORY;
((nsICSSStyleSheet*)aData)->AppendMedium(medium);
NS_RELEASE(medium);
return NS_OK;
}
nsresult
CSSLoaderImpl::SetMedia(nsICSSStyleSheet* aSheet, const nsString& aMedia)
{
nsresult rv = NS_OK;
aSheet->ClearMedia();
if (0 < aMedia.Length()) {
rv = EnumerateMediaString(aMedia, MediumEnumFunc, aSheet);
}
return rv;
}
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,
nsIContent* aElement,
nsICSSLoaderObserver* aObserver)
{
PendingSheetData* data = new PendingSheetData(aSheet,
aDocIndex,
aElement,
aObserver);
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,
nsIContent* aElement, PRBool aNotify,
nsICSSLoaderObserver* aObserver)
{
if ((! mDocument) || (! aSheet)) {
return NS_ERROR_NULL_POINTER;
}
if (nsnull != aElement) {
nsIDOMNode* domNode = nsnull;
if (NS_SUCCEEDED(aElement->QueryInterface(NS_GET_IID(nsIDOMNode), (void**)&domNode))) {
aSheet->SetOwningNode(domNode);
NS_RELEASE(domNode);
}
nsIStyleSheetLinkingElement* element;
if (NS_SUCCEEDED(aElement->QueryInterface(NS_GET_IID(nsIStyleSheetLinkingElement),
(void**)&element))) {
element->SetStyleSheet(aSheet);
NS_RELEASE(element);
}
}
nsAutoString title;
aSheet->GetTitle(title);
aSheet->SetEnabled(! IsAlternate(title));
nsVoidKey key(mDocument);
nsAutoVoidArray* sheetMap = (nsAutoVoidArray*)mSheetMapTable.Get(&key);
if (! sheetMap) {
sheetMap = new nsAutoVoidArray();
if (sheetMap) {
mSheetMapTable.Put(&key, sheetMap);
}
}
if (sheetMap) {
PRInt32 insertIndex = sheetMap->Count();
PRBool insertedSheet = PR_FALSE;
while (0 <= --insertIndex) {
PRInt32 targetIndex = NS_PTR_TO_INT32(sheetMap->ElementAt(insertIndex));
if (targetIndex < aDocIndex) {
mDocument->InsertStyleSheetAt(aSheet, insertIndex + 1, aNotify);
sheetMap->InsertElementAt((void*)aDocIndex, insertIndex + 1);
insertedSheet = PR_TRUE;
break;
}
}
if (!insertedSheet) { // didn't insert yet
mDocument->InsertStyleSheetAt(aSheet, 0, aNotify);
sheetMap->InsertElementAt((void*)aDocIndex, 0);
}
if (nsnull != aObserver) {
aObserver->StyleSheetLoaded(aSheet, aNotify);
}
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;
}
nsVoidKey key(aParentSheet);
nsAutoVoidArray* sheetMap = (nsAutoVoidArray*)mSheetMapTable.Get(&key);
if (! sheetMap) {
sheetMap = new nsAutoVoidArray();
if (sheetMap) {
mSheetMapTable.Put(&key, sheetMap);
}
}
if (sheetMap) {
PRInt32 insertIndex = sheetMap->Count();
while (0 <= --insertIndex) {
PRInt32 targetIndex = NS_PTR_TO_INT32(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
if (aData->mSyncLoad) { // handle agent sheets synchronously
nsIURI* urlClone;
result = aKey.mURL->Clone(&urlClone); // dont give key URL to netlib, it gets munged
if (NS_SUCCEEDED(result)) {
nsIInputStream* in;
result = NS_OpenURI(&in, urlClone);
NS_RELEASE(urlClone);
if (NS_SUCCEEDED(result)) {
// Translate the input using the argument character set id into unicode
nsIUnicharInputStream* uin;
result = NS_NewUTF8ConverterStream(&uin, in, 0);
if (NS_SUCCEEDED(result)) {
mLoadingSheets.Put(&aKey, aData);
PRBool completed;
nsICSSStyleSheet* sheet;
result = ParseSheet(uin, aData, completed, sheet);
NS_ASSERTION(completed, "sync sheet load failed to complete");
NS_IF_RELEASE(sheet);
NS_RELEASE(uin);
}
else {
fputs("CSSLoader::LoadSheet - failed to get converter stream\n", stderr);
}
NS_RELEASE(in);
}
#ifdef DEBUG
else {
// Dump an error message to the console
nsXPIDLCString url;
aKey.mURL->GetSpec(getter_Copies(url));
nsCAutoString errorMessage(NS_LITERAL_CSTRING("CSSLoaderImpl::LoadSheet: Load of URL '") +
nsDependentCString(url) +
NS_LITERAL_CSTRING("' failed. Error code: "));
errorMessage.AppendInt(NS_ERROR_GET_CODE(result));
NS_WARNING(errorMessage.get());
}
#endif
}
}
else if (mDocument || aData->mIsAgent) { // we're still live, start an async load
nsIStreamLoader* loader;
nsIURI* urlClone;
result = aKey.mURL->Clone(&urlClone); // dont give key URL to netlib, it gets munged
if (NS_SUCCEEDED(result)) {
#ifdef NS_DEBUG
mSyncCallback = PR_TRUE;
#endif
nsCOMPtr<nsILoadGroup> loadGroup;
mDocument->GetDocumentLoadGroup(getter_AddRefs(loadGroup));
NS_ASSERTION(loadGroup, "A stylesheet was unable to locate a load group. This means the onload is going to fire too early!");
#ifdef MOZ_TIMELINE
NS_TIMELINE_MARK_URI("Loading style sheet: %s", urlClone);
NS_TIMELINE_INDENT();
#endif
result = NS_NewStreamLoader(&loader, urlClone, aData, nsnull, loadGroup,
nsnull, nsIChannel::LOAD_NORMAL);
#ifdef NS_DEBUG
mSyncCallback = PR_FALSE;
#endif
NS_RELEASE(urlClone);
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);
PRBool equals = PR_FALSE;
result = aKey.mURL->Equals(data->mURL, &equals);
if (NS_SUCCEEDED(result) && equals)
{
mPendingAlternateSheets.RemoveElementAt(index);
NS_IF_RELEASE(loadingData->mNext);
loadingData->mNext = data;
loadingData = data;
}
else {
index++;
}
}
}
}
}
else { // document gone, no point in starting the load
NS_RELEASE(aData);
}
}
return result;
}
NS_IMETHODIMP
CSSLoaderImpl::LoadInlineStyle(nsIContent* aElement,
nsIUnicharInputStream* aIn,
const nsString& aTitle,
const nsString& aMedia,
PRInt32 aDefaultNameSpaceID,
PRInt32 aDocIndex,
nsIParser* aParserToUnblock,
PRBool& aCompleted,
nsICSSLoaderObserver* aObserver)
{
NS_ASSERTION(mDocument, "not initialized");
if (! mDocument) {
return NS_ERROR_NOT_INITIALIZED;
}
// XXX need to add code to cancel any pending sheets for element
nsresult result = NS_ERROR_NULL_POINTER;
if (aIn) {
nsIURI* docURL;
mDocument->GetBaseURL(docURL);
SheetLoadData* data = new SheetLoadData(this, docURL, aTitle, aMedia, aDefaultNameSpaceID,
aElement,
aDocIndex, aParserToUnblock,
PR_TRUE, aObserver);
if (data == nsnull) {
result = NS_ERROR_OUT_OF_MEMORY;
}
else {
NS_ADDREF(data);
nsICSSStyleSheet* sheet;
result = ParseSheet(aIn, data, aCompleted, sheet);
NS_IF_RELEASE(sheet);
if ((! aCompleted) && (aParserToUnblock)) {
data->mDidBlockParser = PR_TRUE;
}
}
NS_RELEASE(docURL);
}
return result;
}
NS_IMETHODIMP
CSSLoaderImpl::LoadStyleLink(nsIContent* aElement,
nsIURI* aURL,
const nsString& aTitle,
const nsString& aMedia,
PRInt32 aDefaultNameSpaceID,
PRInt32 aDocIndex,
nsIParser* aParserToUnblock,
PRBool& aCompleted,
nsICSSLoaderObserver* aObserver)
{
NS_ASSERTION(mDocument, "not initialized");
if (! mDocument) {
return NS_ERROR_NOT_INITIALIZED;
}
//-- Make sure this page is allowed to load this URL
nsresult rv;
nsCOMPtr<nsIScriptSecurityManager> secMan =
do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID, &rv);
if (NS_FAILED(rv)) return rv;
nsIURI* docURI;
rv = mDocument->GetBaseURL(docURI);
if (NS_FAILED(rv) || !docURI) return NS_ERROR_FAILURE;
rv = secMan->CheckLoadURI(docURI, aURL, nsIScriptSecurityManager::ALLOW_CHROME);
NS_IF_RELEASE(docURI);
if (NS_FAILED(rv)) return rv;
// 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);
PRBool sheetModified = PR_FALSE;
nsICSSStyleSheet* sheet = (nsICSSStyleSheet*)mLoadedSheets.Get(&key);
#ifdef INCLUDE_XUL
if (!sheet && IsChromeURI(aURL)) {
nsCOMPtr<nsIXULPrototypeCache> cache(do_GetService("@mozilla.org/xul/xul-prototype-cache;1"));
if (cache) {
PRBool enabled;
cache->GetEnabled(&enabled);
if (enabled) {
nsCOMPtr<nsICSSStyleSheet> cachedSheet;
cache->GetStyleSheet(aURL, getter_AddRefs(cachedSheet));
if (cachedSheet)
sheet = cachedSheet;
}
}
}
#endif
if (sheet && (NS_OK == sheet->IsModified(&sheetModified)) && sheetModified) { // if dirty, forget it
sheet = nsnull;
}
if (sheet) { // already have one fully loaded and unmodified
nsICSSStyleSheet* clone = nsnull;
result = sheet->Clone(clone);
if (NS_SUCCEEDED(result)) {
PrepareSheet(clone, aTitle, aMedia);
if (aParserToUnblock || (0 == mLoadingSheets.Count())) {
// we either have a parser that needs the sheet now, or we aren't currently
// busy. go ahead and put the sheet right into the doc.
result = InsertSheetInDoc(clone, aDocIndex, aElement, PR_TRUE, aObserver);
}
else { // add to pending list
result = AddPendingSheet(clone, aDocIndex, aElement, aObserver);
}
NS_RELEASE(clone);
}
}
else { // need to load it
SheetLoadData* data = new SheetLoadData(this, aURL, aTitle, aMedia, aDefaultNameSpaceID,
aElement, aDocIndex,
aParserToUnblock, PR_FALSE,
aObserver);
if (data == nsnull) {
result = NS_ERROR_OUT_OF_MEMORY;
}
else {
NS_ADDREF(data);
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 {
if (aParserToUnblock) {
data->mDidBlockParser = PR_TRUE;
}
result = LoadSheet(key, data);
}
}
aCompleted = PR_FALSE;
}
}
return result;
}
NS_IMETHODIMP
CSSLoaderImpl::LoadChildSheet(nsICSSStyleSheet* aParentSheet,
nsIURI* aURL,
const nsString& aMedia,
PRInt32 aDefaultNameSpaceID,
PRInt32 aIndex,
nsICSSImportRule* aParentRule)
{
nsresult result = NS_ERROR_NULL_POINTER;
if (aURL) {
URLKey key(aURL);
PRBool sheetModified = PR_FALSE;
nsICSSStyleSheet* sheet = (nsICSSStyleSheet*)mLoadedSheets.Get(&key);
#ifdef INCLUDE_XUL
if (!sheet && IsChromeURI(aURL)) {
nsCOMPtr<nsIXULPrototypeCache> cache(do_GetService("@mozilla.org/xul/xul-prototype-cache;1"));
if (cache) {
PRBool enabled;
cache->GetEnabled(&enabled);
if (enabled) {
nsCOMPtr<nsICSSStyleSheet> cachedSheet;
cache->GetStyleSheet(aURL, getter_AddRefs(cachedSheet));
if (cachedSheet)
sheet = cachedSheet;
}
}
}
#endif
if (sheet && (NS_OK == sheet->IsModified(&sheetModified)) && sheetModified) { // if dirty, forget it
sheet = nsnull;
}
if (sheet) { // already have one loaded and unmodified
nsICSSStyleSheet* clone = nsnull;
result = sheet->Clone(clone);
if (NS_SUCCEEDED(result)) {
result = SetMedia(clone, aMedia);
if (NS_SUCCEEDED(result)) {
result = InsertChildSheet(clone, aParentSheet, aIndex);
if (NS_SUCCEEDED(result) && aParentRule) {
aParentRule->SetSheet(clone);
}
}
NS_RELEASE(clone);
}
}
else {
SheetLoadData* data = new SheetLoadData(this, aURL, aMedia, aDefaultNameSpaceID,
aParentSheet, aIndex, aParentRule);
if (data == nsnull) {
result = NS_ERROR_OUT_OF_MEMORY;
}
else {
NS_ADDREF(data);
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;
data->mIsAgent = parentData->mIsAgent;
data->mSyncLoad = parentData->mSyncLoad;
// verify that sheet doesn't have new child as a parent
do {
PRBool equals;
result = parentData->mURL->Equals(aURL, &equals);
if (NS_SUCCEEDED(result) && equals) { // houston, we have a loop, blow off this child
data->mParentData = nsnull;
NS_RELEASE(data);
return NS_OK;
}
parentData = parentData->mParentData;
} while (parentData);
(data->mParentData->mPendingChildren)++;
}
result = LoadSheet(key, data);
}
}
}
return result;
}
NS_IMETHODIMP
CSSLoaderImpl::LoadAgentSheet(nsIURI* aURL,
nsICSSStyleSheet*& aSheet,
PRBool& aCompleted,
nsICSSLoaderObserver* aObserver)
{
nsresult result = NS_ERROR_NULL_POINTER;
if (aURL) {
// Get an input stream from the url
nsIInputStream* in;
nsIURI* urlClone;
result = aURL->Clone(&urlClone); // dont give key URL to netlib, it gets munged
if (NS_SUCCEEDED(result)) {
result = NS_OpenURI(&in, urlClone);
NS_RELEASE(urlClone);
if (NS_SUCCEEDED(result)) {
// Translate the input, using our characterset, into unicode
nsCOMPtr<nsIConverterInputStream> uin =
do_CreateInstance("@mozilla.org/intl/converter-input-stream;1",
&result);
if (NS_SUCCEEDED(result))
result = uin->Init(in, mCharset.get(), 0);
if (NS_SUCCEEDED(result)) {
SheetLoadData* data = new SheetLoadData(this, aURL, aObserver);
if (data == nsnull) {
result = NS_ERROR_OUT_OF_MEMORY;
}
else {
NS_ADDREF(data);
URLKey key(aURL);
if (aObserver == nsnull) {
mLoadingSheets.Put(&key, data);
result = ParseSheet(uin, data, aCompleted, aSheet);
}
else {
result = LoadSheet(key, data); // this may steal pending alternates too
aCompleted = PR_FALSE;
}
}
}
else {
fputs("CSSLoader::LoadAgentSheet - failed to get converter stream\n", stderr);
}
NS_RELEASE(in);
}
#ifdef DEBUG
else {
// Dump an error message to the console
nsXPIDLCString url;
aURL->GetSpec(getter_Copies(url));
nsCAutoString errorMessage(NS_LITERAL_CSTRING("CSSLoaderImpl::LoadAgentSheet: Load of URL '") +
nsDependentCString(url) +
NS_LITERAL_CSTRING("' failed. Error code: "));
errorMessage.AppendInt(NS_ERROR_GET_CODE(result));
NS_WARNING(errorMessage.get());
}
#endif
}
}
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(NS_GET_IID(nsICSSLoader), (void **)aLoader);
}
nsresult NS_NewCSSLoader(nsICSSLoader** aLoader)
{
CSSLoaderImpl* it = new CSSLoaderImpl();
if (it == nsnull) {
return NS_ERROR_OUT_OF_MEMORY;
}
return it->QueryInterface(NS_GET_IID(nsICSSLoader), (void **)aLoader);
}
NS_IMETHODIMP CSSLoaderImpl::GetCharset(/*out*/nsAString &aCharsetDest) const
{
NS_ASSERTION(mCharset.Length() > 0, "CSSLoader charset should be set in ctor" );
nsresult rv = NS_OK;
aCharsetDest = mCharset;
return rv;
}
NS_IMETHODIMP CSSLoaderImpl::SetCharset(/*in*/ const nsAString &aCharsetSrc)
// public method for clients to set the charset if they know it
// NOTE: the SetCharset method will always get the preferred
// charset from the charset passed in unless it is the
// emptystring, which causes the default charset (that of the
// document, falling back to ISO-8869-1) to be set
{
nsresult rv = NS_ERROR_NOT_AVAILABLE;
if (! aCharsetSrc.IsEmpty()) {
nsCOMPtr<nsICharsetAlias> calias(do_GetService(kCharsetAliasCID, &rv));
NS_ASSERTION(calias, "cannot find charset alias");
if (calias)
{
PRBool same = PR_FALSE;
rv = calias->Equals(aCharsetSrc, mCharset, &same);
if(NS_SUCCEEDED(rv) && same)
{
return NS_OK; // no difference, don't change it
}
rv = calias->GetPreferred(aCharsetSrc, mCharset);
}
} else if (mDocument) {
// GetDocumentCharacterSet returns a charset which already has
// alias resolution done
rv = mDocument->GetDocumentCharacterSet(mCharset);
}
if (mCharset.IsEmpty()) {
mCharset = NS_LITERAL_STRING("ISO-8859-1");
rv = NS_ERROR_NOT_AVAILABLE;
}
return rv;
}
nsresult CSSLoaderImpl::SetCharset(/*in*/ const char* aStyleSheetData,
/*in*/ PRUint32 aDataLength)
// sets the charset based upon the data passed in
// - if the StyleSheetData is not empty and it has '@charset'
// as the first substring, then use that
// - otherwise return an error
{
nsresult rv = NS_ERROR_NOT_AVAILABLE;
nsString strStyleDataUndecoded;
strStyleDataUndecoded.AssignWithConversion(aStyleSheetData, aDataLength);
PRInt32 charsetOffset;
if (strStyleDataUndecoded.Length() > 0) {
nsString str;
static const char atCharsetStr[] = "@charset";
if ((charsetOffset = strStyleDataUndecoded.Find(atCharsetStr)) > -1) {
nsString strValue;
// skip past the ident
strStyleDataUndecoded.Right(str, strStyleDataUndecoded.Length() -
(sizeof(atCharsetStr)-1));
// strip any whitespace
str.StripWhitespace();
// truncate everything past the delimiter (semicolon)
PRInt32 pos = str.Find(";");
if (pos > -1) {
str.Left(strValue,pos);
}
// strip any quotes
strValue.Trim("\"\'");
// that's the charset!
if (!strValue.IsEmpty()) {
rv = SetCharset(strValue);
}
}
}
return rv;
}
static PRBool PR_CALLBACK StopLoadingSheetCallback(nsHashKey* aKey, void* aData, void* aClosure)
{
NS_ENSURE_TRUE(aData, NS_ERROR_NULL_POINTER);
SheetLoadData* data = (SheetLoadData*)aData;
NS_ENSURE_TRUE(data->mLoader, NS_ERROR_NULL_POINTER);
NS_ENSURE_TRUE(data->mURL, NS_ERROR_NULL_POINTER);
data->mLoader->StopLoadingSheet(data->mURL);
return PR_TRUE;
}
NS_IMETHODIMP
CSSLoaderImpl::Stop()
{
if (mLoadingSheets.Count() > 0) {
mLoadingSheets.Enumerate(StopLoadingSheetCallback);
}
return NS_OK;
}
NS_IMETHODIMP
CSSLoaderImpl::StopLoadingSheet(nsIURI* aURL)
{
NS_ENSURE_TRUE(aURL, NS_ERROR_NULL_POINTER);
if (mLoadingSheets.Count() > 0) {
URLKey key(aURL);
SheetLoadData* loadData = (SheetLoadData*)mLoadingSheets.Get(&key);
if (loadData) {
Cleanup(key, loadData);
}
}
return NS_OK;
}
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