/* -*- 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): * Boris Zbarsky * * 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 "nsIContent.h" #include "nsIDOMNode.h" #include "nsIDOMWindow.h" #include "nsIDocument.h" #include "nsIUnicharInputStream.h" #include "nsIConverterInputStream.h" #include "nsICharsetAlias.h" #include "nsUnicharUtils.h" #include "nsHashtable.h" #include "nsIURL.h" #include "nsIServiceManager.h" #include "nsNetUtil.h" #include "nsCRT.h" #include "nsCOMArray.h" #include "nsCOMPtr.h" #include "nsIScriptSecurityManager.h" #include "nsContentPolicyUtils.h" #include "nsIScriptGlobalObject.h" #include "nsITimelineService.h" #include "nsIHttpChannel.h" #include "nsIConsoleService.h" #include "nsIScriptError.h" #include "nsIStringBundle.h" #include "nsMimeTypes.h" #include "nsIAtom.h" #include "nsCSSLoader.h" #include "nsIDOM3Node.h" #ifdef MOZ_XUL #include "nsIXULPrototypeCache.h" #endif #include "nsIDOMMediaList.h" #include "nsIDOMStyleSheet.h" #include "nsIDOMCSSStyleSheet.h" #include "nsIDOMCSSImportRule.h" #ifdef MOZ_LOGGING // #define FORCE_PR_LOG /* Allow logging in the release build */ #endif /* MOZ_LOGGING */ #include "prlog.h" #ifdef PR_LOGGING static PRLogModuleInfo *gLoaderLog = PR_NewLogModule("nsCSSLoader"); #endif /* PR_LOGGING */ #define LOG_FORCE(args) PR_LOG(gLoaderLog, PR_LOG_ALWAYS, args) #define LOG_ERROR(args) PR_LOG(gLoaderLog, PR_LOG_ERROR, args) #define LOG_WARN(args) PR_LOG(gLoaderLog, PR_LOG_WARNING, args) #define LOG_DEBUG(args) PR_LOG(gLoaderLog, PR_LOG_DEBUG, args) #define LOG(args) LOG_DEBUG(args) #define LOG_FORCE_ENABLED() PR_LOG_TEST(gLoaderLog, PR_LOG_ALWAYS) #define LOG_ERROR_ENABLED() PR_LOG_TEST(gLoaderLog, PR_LOG_ERROR) #define LOG_WARN_ENABLED() PR_LOG_TEST(gLoaderLog, PR_LOG_WARNING) #define LOG_DEBUG_ENABLED() PR_LOG_TEST(gLoaderLog, PR_LOG_DEBUG) #define LOG_ENABLED() LOG_DEBUG_ENABLED() #ifdef PR_LOGGING #define LOG_URI(format, uri) \ PR_BEGIN_MACRO \ NS_ASSERTION(uri, "Logging null uri"); \ if (LOG_ENABLED()) { \ nsCAutoString _logURISpec; \ uri->GetSpec(_logURISpec); \ LOG((format, _logURISpec.get())); \ } \ PR_END_MACRO #else // PR_LOGGING #define LOG_URI(format, uri) #endif // PR_LOGGING // And some convenience strings... #ifdef PR_LOGGING static const char* const gStateStrings[] = { "eSheetStateUnknown", "eSheetNeedsParser", "eSheetPending", "eSheetLoading", "eSheetComplete" }; #endif /******************************** * SheetLoadData implementation * ********************************/ NS_IMPL_ISUPPORTS1(SheetLoadData, nsIUnicharStreamLoaderObserver); SheetLoadData::SheetLoadData(CSSLoaderImpl* aLoader, const nsAString& aTitle, nsIParser* aParserToUnblock, nsIURI* aURI, nsICSSStyleSheet* aSheet, nsIStyleSheetLinkingElement* aOwningElement, nsICSSLoaderObserver* aObserver) : mLoader(aLoader), mTitle(aTitle), mParserToUnblock(aParserToUnblock), mURI(aURI), mSheet(aSheet), mNext(nsnull), mParentData(nsnull), mPendingChildren(0), mSyncLoad(PR_FALSE), mIsAgent(PR_FALSE), mIsLoading(PR_FALSE), mIsCancelled(PR_FALSE), mOwningElement(aOwningElement), mObserver(aObserver) { NS_PRECONDITION(mLoader, "Must have a loader!"); NS_ADDREF(mLoader); } SheetLoadData::SheetLoadData(CSSLoaderImpl* aLoader, nsIURI* aURI, nsICSSStyleSheet* aSheet, SheetLoadData* aParentData, nsICSSLoaderObserver* aObserver) : mLoader(aLoader), mParserToUnblock(nsnull), mURI(aURI), mSheet(aSheet), mNext(nsnull), mParentData(aParentData), mPendingChildren(0), mSyncLoad(PR_FALSE), mIsAgent(PR_FALSE), mIsLoading(PR_FALSE), mIsCancelled(PR_FALSE), mOwningElement(nsnull), mObserver(aObserver) { NS_PRECONDITION(mLoader, "Must have a loader!"); NS_ADDREF(mLoader); if (mParentData) { NS_ADDREF(mParentData); mSyncLoad = mParentData->mSyncLoad; mIsAgent = mParentData->mIsAgent; ++(mParentData->mPendingChildren); } } SheetLoadData::SheetLoadData(CSSLoaderImpl* aLoader, nsIURI* aURI, nsICSSStyleSheet* aSheet, PRBool aSyncLoad, nsICSSLoaderObserver* aObserver) : mLoader(aLoader), mParserToUnblock(nsnull), mURI(aURI), mSheet(aSheet), mNext(nsnull), mParentData(nsnull), mPendingChildren(0), mSyncLoad(aSyncLoad), mIsAgent(PR_TRUE), mIsLoading(PR_FALSE), mIsCancelled(PR_FALSE), mOwningElement(nsnull), mObserver(aObserver) { NS_PRECONDITION(mLoader, "Must have a loader!"); NS_ADDREF(mLoader); } SheetLoadData::~SheetLoadData() { NS_RELEASE(mLoader); NS_IF_RELEASE(mParentData); NS_IF_RELEASE(mNext); } /************************* * Loader Implementation * *************************/ // static nsCOMArray* CSSLoaderImpl::gParsers = nsnull; CSSLoaderImpl::CSSLoaderImpl(void) : mDocument(nsnull), mCaseSensitive(PR_FALSE), mEnabled(PR_TRUE), mCompatMode(eCompatibility_FullStandards) { } CSSLoaderImpl::~CSSLoaderImpl(void) { NS_ASSERTION((!mLoadingDatas.IsInitialized()) || mLoadingDatas.Count() == 0, "How did we get destroyed when there are loading data?"); NS_ASSERTION((!mPendingDatas.IsInitialized()) || mPendingDatas.Count() == 0, "How did we get destroyed when there are pending data?"); } NS_IMPL_ISUPPORTS1(CSSLoaderImpl, nsICSSLoader) void CSSLoaderImpl::Shutdown() { delete gParsers; } NS_IMETHODIMP CSSLoaderImpl::Init(nsIDocument* aDocument) { NS_ASSERTION(! mDocument, "already initialized"); if (! mDocument) { mDocument = aDocument; return NS_OK; } return NS_ERROR_ALREADY_INITIALIZED; } PR_STATIC_CALLBACK(PLDHashOperator) StartAlternateLoads(nsIURI *aKey, SheetLoadData* &aData, void* aClosure) { NS_STATIC_CAST(CSSLoaderImpl*,aClosure)->LoadSheet(aData, eSheetNeedsParser); return PL_DHASH_REMOVE; } NS_IMETHODIMP CSSLoaderImpl::DropDocumentReference(void) { mDocument = nsnull; // Flush out pending datas just so we don't leak by accident. These // loads should short-circuit through the mDocument check in // LoadSheet and just end up in SheetComplete immediately mPendingDatas.Enumerate(StartAlternateLoads, this); return NS_OK; } NS_IMETHODIMP CSSLoaderImpl::SetCaseSensitive(PRBool aCaseSensitive) { mCaseSensitive = aCaseSensitive; return NS_OK; } NS_IMETHODIMP CSSLoaderImpl::SetCompatibilityMode(nsCompatibility aCompatMode) { mCompatMode = aCompatMode; return NS_OK; } PR_STATIC_CALLBACK(PLDHashOperator) StartNonAlternates(nsIURI *aKey, SheetLoadData* &aData, void* aClosure) { NS_PRECONDITION(aData, "Must have a data"); NS_PRECONDITION(aClosure, "Must have a loader"); CSSLoaderImpl* loader = NS_STATIC_CAST(CSSLoaderImpl*, aClosure); if (loader->IsAlternate(aData->mTitle)) { return PL_DHASH_NEXT; } // Need to start the load loader->LoadSheet(aData, eSheetNeedsParser); return PL_DHASH_REMOVE; } NS_IMETHODIMP CSSLoaderImpl::SetPreferredSheet(const nsAString& aTitle) { mPreferredSheet = aTitle; // start any pending alternates that aren't alternates anymore mPendingDatas.Enumerate(StartNonAlternates, this); return NS_OK; } NS_IMETHODIMP CSSLoaderImpl::GetParserFor(nsICSSStyleSheet* aSheet, nsICSSParser** aParser) { NS_PRECONDITION(aParser, "Null out param"); *aParser = nsnull; if (!gParsers) { gParsers = new nsCOMArray; if (!gParsers) { return NS_ERROR_OUT_OF_MEMORY; } } PRInt32 count = gParsers->Count(); if (0 < count--) { *aParser = gParsers->ObjectAt(count); NS_ADDREF(*aParser); gParsers->RemoveObjectAt(count); } nsresult result = NS_OK; if (! *aParser) { result = NS_NewCSSParser(aParser); } if (*aParser) { (*aParser)->SetCaseSensitive(mCaseSensitive); (*aParser)->SetQuirkMode(mCompatMode == eCompatibility_NavQuirks); if (aSheet) { (*aParser)->SetStyleSheet(aSheet); } (*aParser)->SetChildLoader(this); } return result; } NS_IMETHODIMP CSSLoaderImpl::RecycleParser(nsICSSParser* aParser) { NS_PRECONDITION(aParser, "Recycle only good parsers, please"); NS_ENSURE_TRUE(gParsers, NS_ERROR_UNEXPECTED); if (!gParsers->AppendObject(aParser)) { return NS_ERROR_FAILURE; } return NS_OK; } static const char kCharsetSym[] = "@charset"; static nsresult GetCharsetFromData(const unsigned char* aStyleSheetData, PRUint32 aDataLength, nsACString& aCharset) { aCharset.Truncate(); if (aDataLength <= sizeof(kCharsetSym) - 1) return NS_ERROR_NOT_AVAILABLE; PRUint32 step = 1; PRUint32 pos = 0; // Determine the encoding type if (*aStyleSheetData == 0x40 && *(aStyleSheetData+1) == 0x63 /* '@c' */ ) { // 1-byte ASCII-based encoding (ISO-8859-*, UTF-8, etc) step = 1; pos = 0; } else if (*aStyleSheetData == 0xEF && *(aStyleSheetData+1) == 0xBB && *(aStyleSheetData+2) == 0xBF) { // UTF-8 BOM step = 1; pos = 3; } else if (*aStyleSheetData == 0xFE && *(aStyleSheetData+1) == 0xFF) { // big-endian 2-byte encoding BOM step = 2; pos = 3; } else if (*aStyleSheetData == 0xFF && *(aStyleSheetData+1) == 0xFE) { // little-endian 2-byte encoding BOM NS_WARNING("Our unicode decoders aren't likely to deal with this one"); step = 2; pos = 2; } else if (*aStyleSheetData == 0x00 && *(aStyleSheetData+1) == 0x00 && *(aStyleSheetData+2) == 0xFE && *(aStyleSheetData+3) == 0xFF) { // big-endian 4-byte encoding BOM step = 4; pos = 7; } else if (*aStyleSheetData == 0xFF && *(aStyleSheetData+1) == 0xFE && *(aStyleSheetData+2) == 0x00 && *(aStyleSheetData+3) == 0x00) { // little-endian 4-byte encoding BOM NS_WARNING("Our unicode decoders aren't likely to deal with this one"); step = 4; pos = 4; } else if (*aStyleSheetData == 0x00 && *(aStyleSheetData+1) == 0x00 && *(aStyleSheetData+2) == 0xFF && *(aStyleSheetData+3) == 0xFE) { // 4-byte encoding BOM in 2143 order NS_WARNING("Our unicode decoders aren't likely to deal with this one"); step = 4; pos = 6; } else if (*aStyleSheetData == 0xFE && *(aStyleSheetData+1) == 0xFF && *(aStyleSheetData+2) == 0x00 && *(aStyleSheetData+3) == 0x00) { // 4-byte encoding BOM in 3412 order NS_WARNING("Our unicode decoders aren't likely to deal with this one"); step = 4; pos = 5; } else if (*aStyleSheetData == 0x00 && *(aStyleSheetData+1) == 0x00 && *(aStyleSheetData+2) == 0x00 && *(aStyleSheetData+3) == 0x40) { // big-endian 4-byte encoding, no BOM step = 4; pos = 3; } else if (*aStyleSheetData == 0x40 && *(aStyleSheetData+1) == 0x00 && *(aStyleSheetData+2) == 0x00 && *(aStyleSheetData+3) == 0x00) { // little-encoding 4-byte encoding, no BOM NS_WARNING("Our unicode decoders aren't likely to deal with this one"); step = 4; pos = 0; } else if (*aStyleSheetData == 0x00 && *(aStyleSheetData+1) == 0x00 && *(aStyleSheetData+2) == 0x40 && *(aStyleSheetData+3) == 0x00) { // 4-byte encoding in 2143 order, no BOM NS_WARNING("Our unicode decoders aren't likely to deal with this one"); step = 4; pos = 2; } else if (*aStyleSheetData == 0x00 && *(aStyleSheetData+1) == 0x40 && *(aStyleSheetData+2) == 0x00 && *(aStyleSheetData+3) == 0x00) { // 4-byte encoding in 3412 order, no BOM NS_WARNING("Our unicode decoders aren't likely to deal with this one"); step = 4; pos = 1; } else if (*aStyleSheetData == 0x00 && *(aStyleSheetData+1) == 0x40 && *(aStyleSheetData+2) == 0x00 && *(aStyleSheetData+3) == 0x00) { // 4-byte encoding in 3412 order, no BOM NS_WARNING("Our unicode decoders aren't likely to deal with this one"); step = 4; pos = 1; } else if (*aStyleSheetData == 0x00 && *(aStyleSheetData+1) == 0x40 && *(aStyleSheetData+2) == 0x00 && *(aStyleSheetData+3) == 0x63) { // 2-byte big-endian encoding, no BOM step = 2; pos = 1; } else if (*aStyleSheetData == 0x40 && *(aStyleSheetData+1) == 0x00 && *(aStyleSheetData+2) == 0x63 && *(aStyleSheetData+3) == 0x00) { // 2-byte big-endian encoding, no BOM NS_WARNING("Our unicode decoders aren't likely to deal with this one"); step = 2; pos = 0; } else { // no clue what this is return NS_ERROR_UNEXPECTED; } PRUint32 index = 0; while (pos < aDataLength && index < sizeof(kCharsetSym) - 1) { if (aStyleSheetData[pos] != kCharsetSym[index]) { return NS_ERROR_NOT_AVAILABLE; } ++index; pos += step; } while (pos < aDataLength && nsCRT::IsAsciiSpace(aStyleSheetData[pos])) { pos += step; } if (pos >= aDataLength || (aStyleSheetData[pos] != '"' && aStyleSheetData[pos] != '\'')) { return NS_ERROR_NOT_AVAILABLE; } char quote = aStyleSheetData[pos]; pos += step; while (pos < aDataLength) { if (aStyleSheetData[pos] == '\\') { pos += step; if (pos >= aDataLength) { break; } } else if (aStyleSheetData[pos] == quote) { break; } // casting to avoid ambiguities aCharset.Append(char(aStyleSheetData[pos])); pos += step; } // Check for the ending ';' pos += step; while (pos < aDataLength && nsCRT::IsAsciiSpace(aStyleSheetData[pos])) { pos += step; } if (pos >= aDataLength || aStyleSheetData[pos] != ';') { aCharset.Truncate(); return NS_ERROR_NOT_AVAILABLE; } return NS_OK; } NS_IMETHODIMP SheetLoadData::OnDetermineCharset(nsIUnicharStreamLoader* aLoader, nsISupports* aContext, const char* aData, PRUint32 aDataLength, nsACString& aCharset) { nsCOMPtr channel; nsresult result = aLoader->GetChannel(getter_AddRefs(channel)); if (NS_FAILED(result)) channel = nsnull; aCharset.Truncate(); /* * First determine the charset (if one is indicated) * 1) Check nsIChannel::contentCharset * 2) Check @charset rules in the data * 3) Check "charset" attribute of the or * * 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) */ if (channel) { channel->GetContentCharset(aCharset); } result = NS_ERROR_NOT_AVAILABLE; #ifdef DEBUG_bzbarsky if (! aCharset.IsEmpty()) { fprintf(stderr, "Setting from HTTP to: %s\n", PromiseFlatCString(aCharset).get()); } #endif if (aCharset.IsEmpty()) { // We have no charset // Try @charset rule result = GetCharsetFromData((const unsigned char*)aData, aDataLength, aCharset); #ifdef DEBUG_bzbarsky if (NS_SUCCEEDED(result)) { fprintf(stderr, "Setting from @charset rule: %s\n", PromiseFlatCString(aCharset).get()); } #endif } if (aCharset.IsEmpty()) { // Now try the charset on the or processing instruction // that loaded us if (mOwningElement) { nsAutoString elementCharset; mOwningElement->GetCharset(elementCharset); CopyUCS2toASCII(elementCharset, aCharset); #ifdef DEBUG_bzbarsky if (! aCharset.IsEmpty()) { fprintf(stderr, "Setting from property on element: %s\n", PromiseFlatCString(aCharset).get()); } #endif } } if (aCharset.IsEmpty() && mLoader->mDocument) { // no useful data on charset. Try the document charset. // That needs no resolution, since it's already fully resolved mLoader->mDocument->GetDocumentCharacterSet(aCharset); #ifdef DEBUG_bzbarsky fprintf(stderr, "Set from document: %s\n", PromiseFlatCString(aCharset).get()); #endif } if (aCharset.IsEmpty()) { NS_WARNING("Unable to determine charset for sheet, using ISO-8859-1!"); aCharset = NS_LITERAL_CSTRING("ISO-8859-1"); } return NS_OK; } /** * Report an error to the error console. * @param aErrorName The name of a string in css.properties. * @param aParams The parameters for that string in css.properties. * @param aParamsLength The length of aParams. * @param aErrorFlags Error/warning flag to pass to nsIScriptError::Init. * * XXX This should be a static method on a class called something like * nsCSSUtils, since it's a general way of accessing css.properties and * will be useful for localizability work on CSS parser error reporting. * However, it would need some way of reporting source file name, text, * line, and column information. */ static nsresult ReportToConsole(const PRUnichar* aMessageName, const PRUnichar **aParams, PRUint32 aParamsLength, PRUint32 aErrorFlags) { nsresult rv; nsCOMPtr consoleService = do_GetService(NS_CONSOLESERVICE_CONTRACTID, &rv); NS_ENSURE_SUCCESS(rv, rv); nsCOMPtr errorObject = do_CreateInstance(NS_SCRIPTERROR_CONTRACTID, &rv); NS_ENSURE_SUCCESS(rv, rv); nsCOMPtr stringBundleService = do_GetService(NS_STRINGBUNDLE_CONTRACTID, &rv); NS_ENSURE_SUCCESS(rv, rv); nsCOMPtr bundle; rv = stringBundleService->CreateBundle( "chrome://global/locale/css.properties", getter_AddRefs(bundle)); NS_ENSURE_SUCCESS(rv, rv); nsXPIDLString errorText; rv = bundle->FormatStringFromName(aMessageName, aParams, aParamsLength, getter_Copies(errorText)); NS_ENSURE_SUCCESS(rv, rv); rv = errorObject->Init(errorText.get(), NS_LITERAL_STRING("").get(), /* file name */ NS_LITERAL_STRING("").get(), /* source line */ 0, /* line number */ 0, /* column number */ aErrorFlags, "CSS Loader"); NS_ENSURE_SUCCESS(rv, rv); consoleService->LogMessage(errorObject); return NS_OK; } /* * Here we need to check that the load did not give us an http error * page and check the mimetype on the channel to make sure we're not * loading non-text/css data in standards mode. */ NS_IMETHODIMP SheetLoadData::OnStreamComplete(nsIUnicharStreamLoader* aLoader, nsISupports* aContext, nsresult aStatus, nsIUnicharInputStream* aDataStream) { LOG(("SheetLoadData::OnStreamComplete")); NS_ASSERTION(!mLoader->mSyncCallback, "Synchronous callback from necko"); if (mIsCancelled) { // Just return. Don't call SheetComplete -- it's already been // called and calling it again will lead to an extra NS_RELEASE on // this data and a likely crash. return NS_OK; } if (!mLoader->mDocument && !mIsAgent) { // Sorry, we don't care about this load anymore LOG_WARN((" No document and not agent sheet; dropping load")); mLoader->SheetComplete(this, PR_FALSE); return NS_OK; } nsCOMPtr channel; nsresult result = aLoader->GetChannel(getter_AddRefs(channel)); if (NS_FAILED(result)) channel = nsnull; nsCOMPtr channelURI; if (channel) { channel->GetURI(getter_AddRefs(channelURI)); } #ifdef MOZ_TIMELINE NS_TIMELINE_OUTDENT(); NS_TIMELINE_MARK_CHANNEL("SheetLoadData::OnStreamComplete(%s)", channel); #endif // MOZ_TIMELINE // If it's an HTTP channel, we want to make sure this is not an // error document we got. nsCOMPtr httpChannel(do_QueryInterface(channel)); if (httpChannel) { PRBool requestSucceeded; result = httpChannel->GetRequestSucceeded(&requestSucceeded); if (NS_SUCCEEDED(result) && !requestSucceeded) { LOG((" Load returned an error page")); mLoader->SheetComplete(this, PR_FALSE); return NS_OK; } } if (aDataStream) { nsCAutoString contentType; if (channel) { channel->GetContentType(contentType); } PRBool validType = contentType.Equals(NS_LITERAL_CSTRING("text/css")) || contentType.Equals(NS_LITERAL_CSTRING(UNKNOWN_CONTENT_TYPE)) || contentType.IsEmpty(); if (mLoader->mCompatMode == eCompatibility_NavQuirks || validType) { if (!validType) { nsCAutoString spec; if (channelURI) { channelURI->GetSpec(spec); } const nsAFlatString& specUCS2 = NS_ConvertUTF8toUCS2(spec); const nsAFlatString& ctypeUCS2 = NS_ConvertASCIItoUCS2(contentType); const PRUnichar *strings[] = { specUCS2.get(), ctypeUCS2.get() }; ReportToConsole(NS_LITERAL_STRING("MimeNotCssWarn").get(), strings, 2, nsIScriptError::warningFlag); } } else { // Drop the data stream so that we do not load it aDataStream = nsnull; nsCAutoString spec; if (channelURI) { channelURI->GetSpec(spec); } const nsAFlatString& specUCS2 = NS_ConvertUTF8toUCS2(spec); const nsAFlatString& ctypeUCS2 = NS_ConvertASCIItoUCS2(contentType); const PRUnichar *strings[] = { specUCS2.get(), ctypeUCS2.get() }; ReportToConsole(NS_LITERAL_STRING("MimeNotCss").get(), strings, 2, nsIScriptError::errorFlag); } } if (NS_FAILED(aStatus) || !aDataStream) { LOG_WARN((" Load failed: status %u, data stream %p", aStatus, aDataStream)); mLoader->SheetComplete(this, PR_FALSE); return NS_OK; } PRBool completed; return mLoader->ParseSheet(aDataStream, this, channelURI ? channelURI : mURI, completed); } #ifdef MOZ_XUL static PRBool IsChromeURI(nsIURI* aURI) { NS_ASSERTION(aURI, "Have to pass in a URI"); PRBool isChrome = PR_FALSE; aURI->SchemeIs("chrome", &isChrome); return isChrome; } #endif typedef nsresult (*nsStringEnumFunc)(const nsAString& aSubString, void *aData); static nsresult EnumerateMediaString(const nsAString& 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 (!subStr.IsEmpty()) { status = (*aFunc)(subStr, aData); } start = ++end; } return status; } static nsresult MediumEnumFunc(const nsAString& aSubString, void* aData) { nsCOMPtr medium = do_GetAtom(aSubString); NS_ENSURE_TRUE(medium, NS_ERROR_OUT_OF_MEMORY); ((nsICSSStyleSheet*)aData)->AppendMedium(medium); return NS_OK; } PRBool CSSLoaderImpl::IsAlternate(const nsAString& aTitle) { if (!aTitle.IsEmpty()) { return PRBool(! aTitle.Equals(mPreferredSheet, nsCaseInsensitiveStringComparator())); } return PR_FALSE; } /** * CheckLoadAllowed will return success if the load is allowed, * failure otherwise. * * @param aSourceURI the uri of the document or parent sheet loading the sheet * @param aTargetURI the uri of the sheet to be loaded * @param aContext the context. This is the element or the @import * rule doing the loading */ nsresult CSSLoaderImpl::CheckLoadAllowed(nsIURI* aSourceURI, nsIURI* aTargetURI, nsISupports* aContext) { LOG(("CSSLoaderImpl::CheckLoadAllowed")); // Check with the security manager nsresult rv; nsCOMPtr secMan = do_GetService(NS_SCRIPTSECURITYMANAGER_CONTRACTID, &rv); NS_ENSURE_SUCCESS(rv, rv); rv = secMan->CheckLoadURI(aSourceURI, aTargetURI, nsIScriptSecurityManager::ALLOW_CHROME); if (NS_FAILED(rv)) { // failure is normal here; don't warn return rv; } LOG((" Passed security check")); // Check with content policy if (!mDocument) { return NS_OK; } nsCOMPtr globalObject; rv = mDocument->GetScriptGlobalObject(getter_AddRefs(globalObject)); if (NS_FAILED(rv) || !globalObject) { LOG((" No script global object")); return rv; } nsCOMPtr domWin(do_QueryInterface(globalObject)); NS_ASSERTION(domWin, "Global object not DOM window?"); PRBool shouldLoad = PR_TRUE; rv = NS_CheckContentLoadPolicy(nsIContentPolicy::STYLESHEET, aTargetURI, aContext, domWin, &shouldLoad); if (NS_SUCCEEDED(rv) && !shouldLoad) { LOG((" Blocked by content policy")); return NS_ERROR_FAILURE; } return rv; } /** * CreateSheet() creates an nsICSSStyleSheet object for the given URI, * if any. If there is no URI given, we just create a new style sheet * object. Otherwise, we check for an existing style sheet object for * that uri in various caches and clone it if we find it. Cloned * sheets will have the title/media/enabled state of the sheet they * are clones off; make sure to call PrepareSheet() on the result of * CreateSheet(). */ nsresult CSSLoaderImpl::CreateSheet(nsIURI* aURI, nsIContent* aLinkingContent, PRBool aSyncLoad, StyleSheetState& aSheetState, nsICSSStyleSheet** aSheet) { LOG(("CSSLoaderImpl::CreateSheet")); NS_PRECONDITION(aSheet, "Null out param!"); NS_ENSURE_TRUE((mCompleteSheets.IsInitialized() || mCompleteSheets.Init()) && (mLoadingDatas.IsInitialized() || mLoadingDatas.Init()) && (mPendingDatas.IsInitialized() || mPendingDatas.Init()), NS_ERROR_OUT_OF_MEMORY); nsresult rv = NS_OK; *aSheet = nsnull; aSheetState = eSheetStateUnknown; if (aURI) { aSheetState = eSheetComplete; nsCOMPtr sheet; // First, the XUL cache #ifdef MOZ_XUL if (IsChromeURI(aURI)) { nsCOMPtr cache(do_GetService("@mozilla.org/xul/xul-prototype-cache;1")); if (cache) { PRBool enabled; cache->GetEnabled(&enabled); if (enabled) { cache->GetStyleSheet(aURI, getter_AddRefs(sheet)); LOG((" From XUL cache: %p", sheet.get())); } } } #endif if (!sheet) { // Then complete sheets mCompleteSheets.Get(aURI, getter_AddRefs(sheet)); LOG((" From completed: %p", sheet.get())); // Then loading sheets if (!sheet && !aSyncLoad) { aSheetState = eSheetLoading; SheetLoadData* loadData = nsnull; mLoadingDatas.Get(aURI, &loadData); if (loadData) { sheet = loadData->mSheet; LOG((" From loading: %p", sheet.get())); } // Then alternate sheets if (!sheet) { aSheetState = eSheetPending; SheetLoadData* loadData = nsnull; mPendingDatas.Get(aURI, &loadData); if (loadData) { sheet = loadData->mSheet; LOG((" From pending: %p", sheet.get())); } } } } if (sheet) { // We can use this cached sheet if it's either incomplete or unmodified PRBool modified = PR_TRUE; sheet->IsModified(&modified); PRBool complete = PR_FALSE; sheet->GetComplete(complete); if (!modified || !complete) { // Proceed on failures; at worst we'll try to create one below sheet->Clone(nsnull, nsnull, nsnull, nsnull, aSheet); NS_ASSERTION(complete || aSheetState != eSheetComplete, "Sheet thinks it's not complete while we think it is"); } } } if (!*aSheet) { aSheetState = eSheetNeedsParser; rv = NS_NewCSSStyleSheet(aSheet); // Don't init the sheet here, but in // ParseSheet once we know the final URI NS_ENSURE_SUCCESS(rv, rv); } NS_ASSERTION(*aSheet, "We should have a sheet by now!"); NS_ASSERTION(aSheetState != eSheetStateUnknown, "Have to set a state!"); LOG((" State: %s", gStateStrings[aSheetState])); return NS_OK; } /** * PrepareSheet() handles setting the media and title on the sheet, as * well as setting the enabled state based on the title */ nsresult CSSLoaderImpl::PrepareSheet(nsICSSStyleSheet* aSheet, const nsAString& aTitle, const nsAString& aMedia) { NS_PRECONDITION(aSheet, "Must have a sheet!"); nsresult rv = NS_OK; aSheet->ClearMedia(); if (!aMedia.IsEmpty()) { rv = EnumerateMediaString(aMedia, MediumEnumFunc, aSheet); } NS_ENSURE_SUCCESS(rv, rv); aSheet->SetTitle(aTitle); aSheet->SetEnabled(! IsAlternate(aTitle)); return NS_OK; } /** * InsertSheetInDoc handles ordering of sheets in the document. Here * we have two types of sheets -- those with linking elements and * those without. The latter are loaded by Link: headers. * The following constraints are observed: * 1) Any sheet with a linking element comes after all sheets without * linking elements * 2) Sheets without linking elements are inserted in the order in * which the inserting requests come in, since all of these are * inserted during header data processing in the content sink * 3) Sheets with linking elements are ordered based on document order * as determined by CompareDocumentPosition. */ nsresult CSSLoaderImpl::InsertSheetInDoc(nsICSSStyleSheet* aSheet, nsIContent* aLinkingContent, nsIDocument* aDocument) { LOG(("CSSLoaderImpl::InsertSheetInDoc")); NS_PRECONDITION(aSheet, "Nothing to insert"); NS_PRECONDITION(aDocument, "Must have a document to insert into"); // all nodes that link in sheets should be implementing nsIDOM3Node nsresult rv = NS_OK; nsCOMPtr linkingNode = do_QueryInterface(aLinkingContent); NS_ASSERTION(linkingNode || !aLinkingContent, "Need to implement nsIDOM3Node to get insertion order right"); // XXX Need to cancel pending sheet loads for this element, if any PRInt32 sheetCount; aDocument->GetNumberOfStyleSheets(PR_FALSE, &sheetCount); /* * Start the walk at the _end_ of the list, since in the typical * case we'll just want to append anyway. We want to break out of * the loop when insertionPoint points to just before the index we * want to insert at. In other words, when we leave the loop * insertionPoint is the index of the stylesheet that immediately * precedes the one we're inserting. */ PRInt32 insertionPoint; for (insertionPoint = sheetCount - 1; insertionPoint >= 0; --insertionPoint) { nsCOMPtr curSheet; aDocument->GetStyleSheetAt(insertionPoint, PR_FALSE, getter_AddRefs(curSheet)); NS_ASSERTION(curSheet, "There must be a sheet here!"); nsCOMPtr domSheet = do_QueryInterface(curSheet); NS_ASSERTION(domSheet, "All the \"normal\" sheets implement nsIDOMStyleSheet"); nsCOMPtr sheetOwner; domSheet->GetOwnerNode(getter_AddRefs(sheetOwner)); if (sheetOwner && !linkingNode) { // Keep moving; all sheets with a sheetOwner come after all // sheets without a linkingNode continue; } if (!sheetOwner) { // Aha! The current sheet has no sheet owner, so we want to // insert after it no matter whether we have a linkingNode break; } // Have to compare PRUint16 comparisonFlags = 0; rv = linkingNode->CompareDocumentPosition(sheetOwner, &comparisonFlags); // If we can't get the order right, just bail... NS_ENSURE_SUCCESS(rv, rv); NS_ASSERTION(!(comparisonFlags & nsIDOM3Node::DOCUMENT_POSITION_DISCONNECTED), "Why are these elements in different documents?"); #ifdef DEBUG { PRBool sameNode = PR_FALSE; linkingNode->IsSameNode(sheetOwner, &sameNode); NS_ASSERTION(!sameNode, "Why do we still have our old sheet?"); } #endif // DEBUG if (comparisonFlags & nsIDOM3Node::DOCUMENT_POSITION_PRECEDING) { // The current sheet comes before us, and it better be the first // such, because now we break break; } } ++insertionPoint; // adjust the index to the spot we want to insert in // XXX elements do not implement nsIStyleSheetLinkingElement; // need to fix this for them to be ordered correctly. nsCOMPtr linkingElement = do_QueryInterface(aLinkingContent); if (linkingElement) { linkingElement->SetStyleSheet(aSheet); // This sets the ownerNode on the sheet } aDocument->InsertStyleSheetAt(aSheet, insertionPoint); LOG((" Inserting into document at position %d", insertionPoint)); return NS_OK; } /** * InsertChildSheet handles ordering of @import-ed sheet in their * parent sheets. Here we want to just insert based on order of the * @import rules that imported the sheets. In theory we can't just * append to the end because the CSSOM can insert @import rules. In * practice, we get the call to load the child sheet before the CSSOM * has finished inserting the @import rule, so we have no idea where * to put it anyway. So just append for now. */ nsresult CSSLoaderImpl::InsertChildSheet(nsICSSStyleSheet* aSheet, nsICSSStyleSheet* aParentSheet, nsICSSImportRule* aParentRule) { LOG(("CSSLoaderImpl::InsertChildSheet")); NS_PRECONDITION(aSheet, "Nothing to insert"); NS_PRECONDITION(aParentSheet, "Need a parent to insert into"); NS_PRECONDITION(aParentSheet, "How did we get imported?"); // child sheets should always start out enabled, even if they got // cloned off of top-level sheets which were disabled aSheet->SetEnabled(PR_TRUE); aParentSheet->AppendStyleSheet(aSheet); aParentRule->SetSheet(aSheet); // This sets the ownerRule on the sheet LOG((" Inserting into parent sheet")); // LOG((" Inserting into parent sheet at position %d", insertionPoint)); return NS_OK; } /** * LoadSheet handles the actual load of a sheet. If the load is * supposed to be synchronous it just opens a channel synchronously * using the given uri, wraps the resulting stream in a converter * stream and calls ParseSheet. Otherwise it tries to look for an * existing load for this URI and piggyback on it. Failing all that, * a new load is kicked off asynchronously. */ nsresult CSSLoaderImpl::LoadSheet(SheetLoadData* aLoadData, StyleSheetState aSheetState) { LOG(("CSSLoaderImpl::LoadSheet")); NS_PRECONDITION(aLoadData, "Need a load data"); NS_PRECONDITION(aLoadData->mURI, "Need a URI to load"); NS_PRECONDITION(aLoadData->mSheet, "Need a sheet to load into"); NS_PRECONDITION(aSheetState != eSheetComplete, "Why bother?"); NS_ASSERTION(mLoadingDatas.IsInitialized(), "mLoadingDatas should be initialized by now."); LOG_URI(" Load from: '%s'", aLoadData->mURI); nsresult rv = NS_OK; if (!mDocument && !aLoadData->mIsAgent) { // No point starting the load; just release all the data and such. LOG_WARN((" No document and not agent sheet; pre-dropping load")); SheetComplete(aLoadData, PR_FALSE); return NS_OK; } if (aLoadData->mSyncLoad) { LOG((" Synchronous load")); NS_ASSERTION(aSheetState == eSheetNeedsParser, "Sync loads can't reuse existing async loads"); // Just load it nsCOMPtr stream; rv = NS_OpenURI(getter_AddRefs(stream), aLoadData->mURI); if (NS_FAILED(rv)) { LOG_ERROR((" Failed to open URI synchronously")); SheetComplete(aLoadData, PR_FALSE); return rv; } nsCOMPtr converterStream = do_CreateInstance("@mozilla.org/intl/converter-input-stream;1", &rv); if (NS_FAILED(rv)) { LOG_ERROR((" Failed to create converter stream")); SheetComplete(aLoadData, PR_FALSE); return rv; } // This forces UA sheets to be UTF-8. We should really look for // @charset rules here via ReadSegments on the raw stream... // 8192 is a nice magic number that happens to be what a lot of // other things use for buffer sizes. rv = converterStream->Init(stream, "UTF-8", 8192, PR_TRUE); if (NS_FAILED(rv)) { LOG_ERROR((" Failed to initialize converter stream")); SheetComplete(aLoadData, PR_FALSE); return rv; } PRBool completed; rv = ParseSheet(converterStream, aLoadData, aLoadData->mURI, completed); NS_ASSERTION(completed, "sync load did not complete"); return rv; } SheetLoadData* existingData = nsnull; if (aSheetState == eSheetLoading) { mLoadingDatas.Get(aLoadData->mURI, &existingData); NS_ASSERTION(existingData, "CreateSheet lied about the state"); } else if (aSheetState == eSheetPending){ mPendingDatas.Get(aLoadData->mURI, &existingData); NS_ASSERTION(existingData, "CreateSheet lied about the state"); } if (existingData) { LOG((" Glomming on to existing load")); SheetLoadData* data = existingData; while (data->mNext) { data = data->mNext; } data->mNext = aLoadData; // transfer ownership if (aSheetState == eSheetPending && !IsAlternate(aLoadData->mTitle)) { // Kick the load off; someone cares about it right away #ifdef DEBUG SheetLoadData* removedData; NS_ASSERTION(mPendingDatas.Get(aLoadData->mURI, &removedData) && removedData == existingData, "Bad pending table."); #endif mPendingDatas.Remove(aLoadData->mURI); LOG((" Forcing load of pending data")); LoadSheet(existingData, eSheetNeedsParser); } // All done here; once the load completes we'll be marked complete // automatically return NS_OK; } #ifdef DEBUG mSyncCallback = PR_TRUE; #endif nsCOMPtr loadGroup; if (mDocument) { mDocument->GetDocumentLoadGroup(getter_AddRefs(loadGroup)); NS_ASSERTION(loadGroup, "No loadgroup for stylesheet; onload will fire early"); } #ifdef MOZ_TIMELINE NS_TIMELINE_MARK_URI("Loading style sheet: %s", aLoadData->mURI); NS_TIMELINE_INDENT(); #endif nsCOMPtr channel; rv = NS_NewChannel(getter_AddRefs(channel), aLoadData->mURI, nsnull, loadGroup, nsnull, nsIChannel::LOAD_NORMAL); if (NS_FAILED(rv)) { LOG_ERROR((" Failed to create channel")); SheetComplete(aLoadData, PR_FALSE); return rv; } nsCOMPtr httpChannel(do_QueryInterface(channel)); if (httpChannel) { // send a minimal Accept header for text/css httpChannel->SetRequestHeader(NS_LITERAL_CSTRING("Accept"), NS_LITERAL_CSTRING("text/css,*/*;q=0.1"), PR_FALSE); if (mDocument) { nsCOMPtr documentURI; mDocument->GetDocumentURL(getter_AddRefs(documentURI)); NS_ASSERTION(documentURI, "Null document uri is bad!"); if (documentURI) { httpChannel->SetReferrer(documentURI); } } } // Now tell the channel we expect text/css data back.... We do // this before opening it, so it's only treated as a hint. channel->SetContentType(NS_LITERAL_CSTRING("text/css")); // We don't have to hold on to the stream loader. The ownership // model is: Necko owns the stream loader, which owns the load data, // which owns us nsCOMPtr streamLoader; rv = NS_NewUnicharStreamLoader(getter_AddRefs(streamLoader), channel, aLoadData); #ifdef DEBUG mSyncCallback = PR_FALSE; #endif if (NS_FAILED(rv)) { LOG_ERROR((" Failed to create stream loader")); SheetComplete(aLoadData, PR_FALSE); return rv; } mLoadingDatas.Put(aLoadData->mURI, aLoadData); aLoadData->mIsLoading = PR_TRUE; return NS_OK; } /** * ParseSheet handles parsing the data stream. The main idea here is * to push the current load data onto the parse stack before letting * the CSS parser at the data stream. That lets us handle @import * correctly. */ nsresult CSSLoaderImpl::ParseSheet(nsIUnicharInputStream* aStream, SheetLoadData* aLoadData, nsIURI* aSheetURI, PRBool& aCompleted) { LOG(("CSSLoaderImpl::ParseSheet")); NS_PRECONDITION(aStream, "Must have data to parse"); NS_PRECONDITION(aLoadData, "Must have load data"); NS_PRECONDITION(aSheetURI, "Must have sheet URI"); NS_PRECONDITION(aLoadData->mSheet, "Must have sheet to parse into"); aCompleted = PR_FALSE; // Init the sheet with the correct URI so that the relative URIs in // it will be resolved properly. nsresult rv = aLoadData->mSheet->Init(aSheetURI); NS_ASSERTION(NS_SUCCEEDED(rv), "If this is failing, something has gone terribly wrong"); nsCOMPtr parser; rv = GetParserFor(aLoadData->mSheet, getter_AddRefs(parser)); if (NS_FAILED(rv)) { LOG_ERROR((" Failed to get CSS parser")); SheetComplete(aLoadData, PR_FALSE); return rv; } // The parser insists on passing out a strong ref to the sheet it // parsed. We don't care. nsCOMPtr dummySheet; // Push our load data on the stack so any kids can pick it up mParsingDatas.AppendElement(aLoadData); rv = parser->Parse(aStream, aSheetURI, *getter_AddRefs(dummySheet)); mParsingDatas.RemoveElementAt(mParsingDatas.Count() - 1); RecycleParser(parser); NS_ASSERTION(aLoadData->mPendingChildren == 0 || !aLoadData->mSyncLoad, "Sync load has leftover pending children!"); if (aLoadData->mPendingChildren == 0) { LOG((" No pending kids from parse")); aCompleted = PR_TRUE; if (!aLoadData->mURI) { // inline sheet and we're all done with no kids, so we will not // be blocking the parser LOG((" Inline sheet with no pending kids; nulling out parser")); aLoadData->mParserToUnblock = nsnull; } SheetComplete(aLoadData, PR_TRUE); } // Otherwise, the children are holding strong refs to the data and // will call SheetComplete() on it when they complete. return NS_OK; } /** * SheetComplete is the do-it-all cleanup function. It removes the * load data from the "loading" hashtable, adds the sheet to the * "completed" hashtable, massages the XUL cache, handles siblings of * the load data (other loads for the same URI, handles unblocking * blocked parent loads as needed, and most importantly calls * NS_RELEASE on the load data to destroy the whole mess. */ void CSSLoaderImpl::SheetComplete(SheetLoadData* aLoadData, PRBool aSucceeded) { LOG(("CSSLoaderImpl::SheetComplete")); NS_PRECONDITION(aLoadData, "Must have a load data!"); NS_PRECONDITION(aLoadData->mSheet, "Must have a sheet"); NS_ASSERTION(mLoadingDatas.IsInitialized(),"mLoadingDatas should be initialized by now."); LOG(("Load completed: %d", aSucceeded)); // Twiddle the hashtables if (aLoadData->mURI) { LOG_URI(" Finished loading: '%s'", aLoadData->mURI); // Remove the data from the list of loading datas if (aLoadData->mIsLoading) { #ifdef DEBUG SheetLoadData *loadingData; NS_ASSERTION(mLoadingDatas.Get(aLoadData->mURI, &loadingData) && loadingData == aLoadData, "Bad loading table"); #endif mLoadingDatas.Remove(aLoadData->mURI); aLoadData->mIsLoading = PR_FALSE; } } // This is a mess. If we have a document.write() that writes out // two elements pointing to the same url, we will actually // end up blocking the same parser twice. This seems very wrong -- // if we blocked it the first time, why is more stuff getting // written?? In any case, we only want to unblock it once. // Otherwise we get icky things like crashes in layout... We need // to stop blocking the parser. We really do. PRBool seenParser = PR_FALSE; // Go through and deal with the whole linked list. SheetLoadData* data = aLoadData; while (data) { data->mSheet->SetModified(PR_FALSE); // it's clean data->mSheet->SetComplete(); if (data->mObserver) { data->mObserver->StyleSheetLoaded(data->mSheet, PR_TRUE); } if (data->mParserToUnblock) { LOG(("Parser to unblock: %p", data->mParserToUnblock.get())); if (!seenParser) { LOG(("Unblocking parser: %p", data->mParserToUnblock.get())); seenParser = PR_TRUE; data->mParserToUnblock->ContinueParsing(); } data->mParserToUnblock = nsnull; // drop the ref, just in case } NS_ASSERTION(!data->mParentData || data->mParentData->mPendingChildren != 0, "Broken pending child count on our parent"); // If we have a parent, our parent is no longer being parsed, and // we are the last pending child, then our load completion // completes the parent too. Note that the parent _can_ still be // being parsed (eg if the child (us) failed to open the channel // or some such). if (data->mParentData && --(data->mParentData->mPendingChildren) == 0 && mParsingDatas.IndexOf(data->mParentData) == -1) { SheetComplete(data->mParentData, aSucceeded); } data = data->mNext; } // Now that it's marked complete, put the sheet in our cache if (aSucceeded && aLoadData->mURI) { #ifdef MOZ_XUL if (IsChromeURI(aLoadData->mURI)) { nsCOMPtr cache(do_GetService("@mozilla.org/xul/xul-prototype-cache;1")); if (cache) { PRBool enabled; cache->GetEnabled(&enabled); if (enabled) { nsCOMPtr sheet; cache->GetStyleSheet(aLoadData->mURI, getter_AddRefs(sheet)); if (!sheet) { LOG((" Putting sheet in XUL prototype cache")); cache->PutStyleSheet(aLoadData->mSheet); } } } } else { #endif mCompleteSheets.Put(aLoadData->mURI, aLoadData->mSheet); #ifdef MOZ_XUL } #endif } NS_RELEASE(aLoadData); // this will release parents and siblings and all that if (mLoadingDatas.Count() == 0 && mPendingDatas.Count() > 0) { LOG((" No more loading sheets; starting alternates")); mPendingDatas.Enumerate(StartAlternateLoads, this); } } NS_IMETHODIMP CSSLoaderImpl::LoadInlineStyle(nsIContent* aElement, nsIUnicharInputStream* aStream, const nsAString& aTitle, const nsAString& aMedia, nsIParser* aParserToUnblock, PRBool& aCompleted, nsICSSLoaderObserver* aObserver) { LOG(("CSSLoaderImpl::LoadInlineStyle")); NS_PRECONDITION(aStream, "Must have a stream to parse!"); NS_ASSERTION(mParsingDatas.Count() == 0, "We're in the middle of a parse?"); aCompleted = PR_TRUE; if (!mEnabled) { LOG_WARN((" Not enabled")); return NS_ERROR_NOT_AVAILABLE; } NS_ENSURE_TRUE(mDocument, NS_ERROR_NOT_INITIALIZED); nsCOMPtr owningElement(do_QueryInterface(aElement)); NS_ASSERTION(owningElement, "Element is not a style linking element!"); StyleSheetState state; nsCOMPtr sheet; nsresult rv = CreateSheet(nsnull, aElement, PR_FALSE, state, getter_AddRefs(sheet)); NS_ENSURE_SUCCESS(rv, rv); NS_ASSERTION(state == eSheetNeedsParser, "Inline sheets should not be cached"); rv = PrepareSheet(sheet, aTitle, aMedia); NS_ENSURE_SUCCESS(rv, rv); rv = InsertSheetInDoc(sheet, aElement, mDocument); NS_ENSURE_SUCCESS(rv, rv); SheetLoadData* data = new SheetLoadData(this, aTitle, aParserToUnblock, nsnull, sheet, owningElement, aObserver); if (!data) { sheet->SetComplete(); return NS_ERROR_OUT_OF_MEMORY; } nsCOMPtr baseURI; aElement->GetBaseURL(getter_AddRefs(baseURI)); NS_ADDREF(data); // Parse completion releases the load data return ParseSheet(aStream, data, baseURI, aCompleted); } NS_IMETHODIMP CSSLoaderImpl::LoadStyleLink(nsIContent* aElement, nsIURI* aURL, const nsAString& aTitle, const nsAString& aMedia, nsIParser* aParserToUnblock, PRBool& aCompleted, nsICSSLoaderObserver* aObserver) { LOG(("CSSLoaderImpl::LoadStyleLink")); NS_PRECONDITION(aURL, "Must have URL to load"); NS_ASSERTION(mParsingDatas.Count() == 0, "We're in the middle of a parse?"); LOG_URI(" Link uri: '%s'", aURL); aCompleted = PR_TRUE; if (!mEnabled) { LOG_WARN((" Not enabled")); return NS_ERROR_NOT_AVAILABLE; } NS_ENSURE_TRUE(mDocument, NS_ERROR_NOT_INITIALIZED); // Check whether we should even load nsCOMPtr docURI; nsresult rv = mDocument->GetDocumentURL(getter_AddRefs(docURI)); if (NS_FAILED(rv) || !docURI) return NS_ERROR_FAILURE; rv = CheckLoadAllowed(docURI, aURL, aElement); if (NS_FAILED(rv)) return rv; LOG((" Passed load check")); StyleSheetState state; nsCOMPtr sheet; rv = CreateSheet(aURL, aElement, PR_FALSE, state, getter_AddRefs(sheet)); NS_ENSURE_SUCCESS(rv, rv); rv = PrepareSheet(sheet, aTitle, aMedia); NS_ENSURE_SUCCESS(rv, rv); rv = InsertSheetInDoc(sheet, aElement, mDocument); NS_ENSURE_SUCCESS(rv, rv); if (state == eSheetComplete) { LOG((" Sheet already complete")); // We're completely done; this sheet is fully loaded, clean, and so forth if (aObserver) { aObserver->StyleSheetLoaded(sheet, PR_TRUE); } return NS_OK; } nsCOMPtr owningElement(do_QueryInterface(aElement)); // Now we need to actually load it SheetLoadData* data = new SheetLoadData(this, aTitle, aParserToUnblock, aURL, sheet, owningElement, aObserver); if (!data) { sheet->SetComplete(); if (aObserver) { aObserver->StyleSheetLoaded(sheet, PR_TRUE); } return NS_ERROR_OUT_OF_MEMORY; } NS_ADDREF(data); // Caller gets to wait for the sheet to load. aCompleted = PR_FALSE; // If we have to parse and it's an alternate non-inline, defer it if (aURL && state == eSheetNeedsParser && mLoadingDatas.Count() != 0 && IsAlternate(aTitle)) { LOG((" Deferring alternate sheet load")); mPendingDatas.Put(aURL, data); return NS_OK; } // Load completion will free the data return LoadSheet(data, state); } NS_IMETHODIMP CSSLoaderImpl::LoadChildSheet(nsICSSStyleSheet* aParentSheet, nsIURI* aURL, const nsAString& aMedia, nsICSSImportRule* aParentRule) { LOG(("CSSLoaderImpl::LoadChildSheet")); NS_PRECONDITION(aURL, "Must have a URI to load"); if (!mEnabled) { LOG_WARN((" Not enabled")); return NS_ERROR_NOT_AVAILABLE; } LOG_URI(" Child uri: '%s'", aURL); // Check whether we should even load nsCOMPtr sheetURI; nsresult rv = aParentSheet->GetURL(*getter_AddRefs(sheetURI)); if (NS_FAILED(rv) || !sheetURI) return NS_ERROR_FAILURE; rv = CheckLoadAllowed(sheetURI, aURL, aParentRule); if (NS_FAILED(rv)) return rv; LOG((" Passed load check")); SheetLoadData* parentData = nsnull; nsCOMPtr observer; PRInt32 count = mParsingDatas.Count(); if (count > 0) { LOG((" Have a parent load")); parentData = NS_STATIC_CAST(SheetLoadData*, mParsingDatas.ElementAt(count - 1)); // Check for cycles SheetLoadData* data = parentData; while (data && data->mURI) { PRBool equal; if (NS_SUCCEEDED(data->mURI->Equals(aURL, &equal)) && equal) { // Houston, we have a loop, blow off this child and pretend this never // happened LOG_ERROR((" @import cycle detected, dropping load")); return NS_OK; } data = data->mParentData; } NS_ASSERTION(parentData->mSheet == aParentSheet, "Unexpected call to LoadChildSheet"); } else { LOG((" No parent load; must be CSSOM")); // No parent load data, so the sheet will need to be notified when // we finish, if it can be, if we do the load asynchronously. observer = do_QueryInterface(aParentSheet); } // Now that we know it's safe to load this (passes security check and not a // loop) do so nsCOMPtr sheet; StyleSheetState state; rv = CreateSheet(aURL, nsnull, parentData ? parentData->mSyncLoad : PR_FALSE, state, getter_AddRefs(sheet)); NS_ENSURE_SUCCESS(rv, rv); rv = PrepareSheet(sheet, NS_LITERAL_STRING(""), aMedia); NS_ENSURE_SUCCESS(rv, rv); rv = InsertChildSheet(sheet, aParentSheet, aParentRule); NS_ENSURE_SUCCESS(rv, rv); if (state == eSheetComplete) { LOG((" Sheet already complete")); // We're completely done. No need to notify, even, since the // @import rule addition/modification will trigger the right style // changes automatically. return NS_OK; } SheetLoadData* data = new SheetLoadData(this, aURL, sheet, parentData, observer); if (!data) { sheet->SetComplete(); return NS_ERROR_OUT_OF_MEMORY; } NS_ADDREF(data); // Load completion will release the data return LoadSheet(data, state); } NS_IMETHODIMP CSSLoaderImpl::LoadAgentSheet(nsIURI* aURL, nsICSSStyleSheet** aSheet) { LOG(("CSSLoaderImpl::LoadAgentSheet synchronous")); return InternalLoadAgentSheet(aURL, aSheet, nsnull); } NS_IMETHODIMP CSSLoaderImpl::LoadAgentSheet(nsIURI* aURL, nsICSSLoaderObserver* aObserver) { LOG(("CSSLoaderImpl::LoadAgentSheet asynchronous")); return InternalLoadAgentSheet(aURL, nsnull, aObserver); } nsresult CSSLoaderImpl::InternalLoadAgentSheet(nsIURI* aURL, nsICSSStyleSheet** aSheet, nsICSSLoaderObserver* aObserver) { NS_PRECONDITION(aURL, "Must have a URI to load"); NS_PRECONDITION((!aSheet || !aObserver) && (aSheet || aObserver), "One or the other please, at most one"); NS_ASSERTION(mParsingDatas.Count() == 0, "We're in the middle of a parse?"); LOG_URI(" Agent uri: '%s'", aURL); if (!mEnabled) { LOG_WARN((" Not enabled")); return NS_ERROR_NOT_AVAILABLE; } StyleSheetState state; nsCOMPtr sheet; PRBool syncLoad = (aObserver == nsnull); nsresult rv = CreateSheet(aURL, nsnull, syncLoad, state, getter_AddRefs(sheet)); NS_ENSURE_SUCCESS(rv, rv); NS_NAMED_LITERAL_STRING(empty, ""); rv = PrepareSheet(sheet, empty, empty); NS_ENSURE_SUCCESS(rv, rv); if (aSheet) { *aSheet = nsnull; } if (state == eSheetComplete) { LOG((" Sheet already complete")); if (aSheet) { *aSheet = sheet; NS_ADDREF(*aSheet); } else { aObserver->StyleSheetLoaded(sheet, PR_TRUE); } return NS_OK; } SheetLoadData* data = new SheetLoadData(this, aURL, sheet, syncLoad, aObserver); if (!data) { sheet->SetComplete(); return NS_ERROR_OUT_OF_MEMORY; } NS_ADDREF(data); rv = LoadSheet(data, state); if (NS_SUCCEEDED(rv) && aSheet) { *aSheet = sheet; NS_ADDREF(*aSheet); } return rv; } nsresult NS_NewCSSLoader(nsIDocument* aDocument, nsICSSLoader** aLoader) { CSSLoaderImpl* it = new CSSLoaderImpl(); NS_ENSURE_TRUE(it, NS_ERROR_OUT_OF_MEMORY); it->Init(aDocument); return CallQueryInterface(it, aLoader); } nsresult NS_NewCSSLoader(nsICSSLoader** aLoader) { CSSLoaderImpl* it = new CSSLoaderImpl(); NS_ENSURE_TRUE(it, NS_ERROR_OUT_OF_MEMORY); return CallQueryInterface(it, aLoader); } PR_STATIC_CALLBACK(PLDHashOperator) StopLoadingSheetCallback(nsIURI* aKey, SheetLoadData*& aData, void* aClosure) { NS_PRECONDITION(aData, "Must have a data!"); NS_PRECONDITION(aClosure, "Must have a loader"); aData->mIsLoading = PR_FALSE; // we will handle the removal right here aData->mIsCancelled = PR_TRUE; NS_STATIC_CAST(CSSLoaderImpl*,aClosure)->SheetComplete(aData, PR_FALSE); return PL_DHASH_REMOVE; } NS_IMETHODIMP CSSLoaderImpl::Stop() { if (mLoadingDatas.Count() > 0) { mLoadingDatas.Enumerate(StopLoadingSheetCallback, this); } if (mPendingDatas.Count() > 0) { mPendingDatas.Enumerate(StopLoadingSheetCallback, this); } return NS_OK; } NS_IMETHODIMP CSSLoaderImpl::StopLoadingSheet(nsIURI* aURL) { NS_ENSURE_TRUE(aURL, NS_ERROR_NULL_POINTER); if (mLoadingDatas.Count() > 0 || mPendingDatas.Count() > 0) { SheetLoadData* loadData = nsnull; mLoadingDatas.Get(aURL, &loadData); if (!loadData) { mPendingDatas.Get(aURL, &loadData); if (loadData) { // have to remove from mPendingDatas ourselves, since // SheetComplete won't do that. mPendingDatas.Remove(aURL); } } if (loadData) { loadData->mIsCancelled = PR_TRUE; SheetComplete(loadData, PR_FALSE); } } return NS_OK; } NS_IMETHODIMP CSSLoaderImpl::GetEnabled(PRBool *aEnabled) { NS_ENSURE_ARG_POINTER(aEnabled); *aEnabled = mEnabled; return NS_OK; } NS_IMETHODIMP CSSLoaderImpl::SetEnabled(PRBool aEnabled) { mEnabled = aEnabled; return NS_OK; }