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gecko-dev/layout/style/nsCSSLoader.cpp
gerv%gerv.net 9d2ee4928c Bug 236613: change to MPL/LGPL/GPL tri-license.
2004-04-17 21:52:36 +00:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla 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/MPL/
*
* 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 the Initial Developer are Copyright (C) 1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK *****
*
* 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 "nsContentUtils.h"
#include "nsCRT.h"
#include "nsCOMArray.h"
#include "nsISupportsArray.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<nsICSSParser>* 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
if (mPendingDatas.IsInitialized())
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
if (mPendingDatas.IsInitialized())
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<nsICSSParser>;
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 we have a BOM, set aCharset to the
// charset listed for that BOM in http://www.w3.org/TR/REC-xml#sec-guessing;
// that way even if we don't have a valid @charset rule we can use the BOM to
// get a reasonable charset. If we do have an @charset rule, the string from
// that will override this fallback setting of aCharset.
if (*aStyleSheetData == 0x40 && *(aStyleSheetData+1) == 0x63 /* '@c' */ ) {
// 1-byte ASCII-based encoding (ISO-8859-*, UTF-8, etc), no BOM
step = 1;
pos = 0;
}
else if (aStyleSheetData[0] == 0xEF &&
aStyleSheetData[1] == 0xBB &&
aStyleSheetData[2] == 0xBF) {
// UTF-8 BOM
step = 1;
pos = 3;
aCharset = "UTF-8";
}
// Check for a 4-byte encoding BOM before checking for a 2-byte one,
// since the latter can be a proper subset of the former.
else if (aStyleSheetData[0] == 0x00 &&
aStyleSheetData[1] == 0x00 &&
aStyleSheetData[2] == 0xFE &&
aStyleSheetData[3] == 0xFF) {
// big-endian 4-byte encoding BOM
step = 4;
pos = 7;
aCharset = "UTF-32BE";
}
else if (aStyleSheetData[0] == 0xFF &&
aStyleSheetData[1] == 0xFE &&
aStyleSheetData[2] == 0x00 &&
aStyleSheetData[3] == 0x00) {
// little-endian 4-byte encoding BOM
step = 4;
pos = 4;
aCharset = "UTF-32LE";
}
else if (aStyleSheetData[0] == 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;
aCharset = "UTF-32";
}
else if (aStyleSheetData[0] == 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;
aCharset = "UTF-32";
}
else if (aStyleSheetData[0] == 0xFE && aStyleSheetData[1] == 0xFF) {
// big-endian 2-byte encoding BOM
step = 2;
pos = 3;
aCharset = "UTF-16BE";
}
else if (aStyleSheetData[0] == 0xFF && aStyleSheetData[1] == 0xFE) {
// little-endian 2-byte encoding BOM
step = 2;
pos = 2;
aCharset = "UTF-16LE";
}
else if (aStyleSheetData[0] == 0x00 &&
aStyleSheetData[1] == 0x00 &&
aStyleSheetData[2] == 0x00 &&
aStyleSheetData[3] == 0x40) {
// big-endian 4-byte encoding, no BOM
step = 4;
pos = 3;
}
else if (aStyleSheetData[0] == 0x40 &&
aStyleSheetData[1] == 0x00 &&
aStyleSheetData[2] == 0x00 &&
aStyleSheetData[3] == 0x00) {
// little-endian 4-byte encoding, no BOM
step = 4;
pos = 0;
}
else if (aStyleSheetData[0] == 0x00 &&
aStyleSheetData[1] == 0x00 &&
aStyleSheetData[2] == 0x40 &&
aStyleSheetData[3] == 0x00) {
// 4-byte encoding in 2143 order, no BOM
step = 4;
pos = 2;
}
else if (aStyleSheetData[0] == 0x00 &&
aStyleSheetData[1] == 0x40 &&
aStyleSheetData[2] == 0x00 &&
aStyleSheetData[3] == 0x00) {
// 4-byte encoding in 3412 order, no BOM
step = 4;
pos = 1;
}
else if (aStyleSheetData[0] == 0x00 &&
aStyleSheetData[1] == 0x40 &&
aStyleSheetData[2] == 0x00 &&
aStyleSheetData[3] == 0x63) {
// 2-byte big-endian encoding, no BOM
step = 2;
pos = 1;
}
else if (aStyleSheetData[0] == 0x40 &&
aStyleSheetData[1] == 0x00 &&
aStyleSheetData[2] == 0x63 &&
aStyleSheetData[3] == 0x00) {
// 2-byte little-endian encoding, no BOM
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]) {
// If we have a guess as to the charset based on the BOM, then
// we can just return NS_OK even if there is no valid @charset
// rule.
return aCharset.IsEmpty() ? NS_ERROR_NOT_AVAILABLE : NS_OK;
}
++index;
pos += step;
}
while (pos < aDataLength && nsCRT::IsAsciiSpace(aStyleSheetData[pos])) {
pos += step;
}
if (pos >= aDataLength ||
(aStyleSheetData[pos] != '"' && aStyleSheetData[pos] != '\'')) {
return aCharset.IsEmpty() ? NS_ERROR_NOT_AVAILABLE : NS_OK;
}
char quote = aStyleSheetData[pos];
pos += step;
nsCAutoString charset;
while (pos < aDataLength) {
if (aStyleSheetData[pos] == '\\') {
pos += step;
if (pos >= aDataLength) {
break;
}
} else if (aStyleSheetData[pos] == quote) {
break;
}
// casting to avoid ambiguities
charset.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] != ';') {
return aCharset.IsEmpty() ? NS_ERROR_NOT_AVAILABLE : NS_OK;
}
aCharset = charset;
return NS_OK;
}
NS_IMETHODIMP
SheetLoadData::OnDetermineCharset(nsIUnicharStreamLoader* aLoader,
nsISupports* aContext,
const char* aData,
PRUint32 aDataLength,
nsACString& aCharset)
{
LOG_URI("SheetLoadData::OnDetermineCharset for '%s'", mURI);
nsCOMPtr<nsIChannel> 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 <LINK> or <?xml-stylesheet?>
*
* If all these fail to give us a charset, fall back on our default
* (parent sheet charset, document charset or ISO-8859-1 in that order)
*/
if (channel) {
channel->GetContentCharset(aCharset);
}
result = NS_ERROR_NOT_AVAILABLE;
#ifdef PR_LOGGING
if (! aCharset.IsEmpty()) {
LOG((" Setting from HTTP to: %s", PromiseFlatCString(aCharset).get()));
}
#endif
if (aCharset.IsEmpty()) {
// We have no charset
// Try @charset rule and BOM
result = GetCharsetFromData((const unsigned char*)aData,
aDataLength, aCharset);
#ifdef PR_LOGGING
if (NS_SUCCEEDED(result)) {
LOG((" Setting from @charset rule or BOM: %s",
PromiseFlatCString(aCharset).get()));
}
#endif
}
if (aCharset.IsEmpty()) {
// Now try the charset on the <link> or processing instruction
// that loaded us
if (mOwningElement) {
nsAutoString elementCharset;
mOwningElement->GetCharset(elementCharset);
CopyUCS2toASCII(elementCharset, aCharset);
#ifdef PR_LOGGING
if (! aCharset.IsEmpty()) {
LOG((" Setting from property on element: %s",
PromiseFlatCString(aCharset).get()));
}
#endif
}
}
if (aCharset.IsEmpty() && mParentData) {
aCharset = mParentData->mCharset;
#ifdef PR_LOGGING
if (! aCharset.IsEmpty()) {
LOG((" Setting from parent sheet: %s",
PromiseFlatCString(aCharset).get()));
}
#endif
}
if (aCharset.IsEmpty() && mLoader->mDocument) {
// no useful data on charset. Try the document charset.
aCharset = mLoader->mDocument->GetDocumentCharacterSet();
#ifdef PR_LOGGING
LOG((" Set from document: %s", PromiseFlatCString(aCharset).get()));
#endif
}
if (aCharset.IsEmpty()) {
NS_WARNING("Unable to determine charset for sheet, using ISO-8859-1!");
#ifdef PR_LOGGING
LOG_WARN((" Falling back to ISO-8859-1"));
#endif
aCharset = NS_LITERAL_CSTRING("ISO-8859-1");
}
mCharset = aCharset;
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<nsIConsoleService> consoleService =
do_GetService(NS_CONSOLESERVICE_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIScriptError> errorObject =
do_CreateInstance(NS_SCRIPTERROR_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIStringBundleService> stringBundleService =
do_GetService(NS_STRINGBUNDLE_CONTRACTID, &rv);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIStringBundle> 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(),
EmptyString().get(), /* file name */
EmptyString().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<nsIChannel> channel;
nsresult result = aLoader->GetChannel(getter_AddRefs(channel));
if (NS_FAILED(result))
channel = nsnull;
nsCOMPtr<nsIURI> 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<nsIHttpChannel> 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;
}
if (channelURI) {
// Enough to set the URI on mSheet, since any sibling datas we have share
// the same mInner as mSheet and will thus get the same URI.
mSheet->SetURL(channelURI);
}
PRBool completed;
return mLoader->ParseSheet(aDataStream, this, 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 = stringList.BeginWriting();
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<nsIAtom> 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
nsIScriptSecurityManager *secMan = nsContentUtils::GetSecurityManager();
nsresult 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;
}
nsIScriptGlobalObject *globalObject = mDocument->GetScriptGlobalObject();
if (!globalObject) {
LOG((" No script global object"));
return NS_OK;
}
nsCOMPtr<nsIDOMWindow> 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<nsICSSStyleSheet> sheet;
// First, the XUL cache
#ifdef MOZ_XUL
if (IsChromeURI(aURI)) {
nsCOMPtr<nsIXULPrototypeCache> 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;
nsCOMPtr<nsIURI> sheetURI = aURI;
if (!sheetURI) {
// Inline style. Use the document's base URL so that @import in
// the inline sheet picks up the right base.
NS_ASSERTION(aLinkingContent, "Inline stylesheet without linking content?");
sheetURI = aLinkingContent->GetBaseURI();
}
rv = NS_NewCSSStyleSheet(aSheet, sheetURI);
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,
nsISupportsArray* aMediaArr)
{
NS_PRECONDITION(aSheet, "Must have a sheet!");
NS_PRECONDITION(aMedia.IsEmpty() || !aMediaArr,
"Can't have media array _and_ media string!");
nsresult rv = NS_OK;
aSheet->ClearMedia();
if (!aMedia.IsEmpty()) {
rv = EnumerateMediaString(aMedia, MediumEnumFunc, aSheet);
} else if (aMediaArr) {
PRUint32 count;
aMediaArr->Count(&count);
for (PRUint32 i = 0; i < count; ++i) {
nsCOMPtr<nsIAtom> medium = do_QueryElementAt(aMediaArr, i);
NS_ASSERTION(medium, "Null medium in media array!");
aSheet->AppendMedium(medium);
}
}
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<nsIDOM3Node> 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);
/*
* 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) {
nsIStyleSheet *curSheet = aDocument->GetStyleSheetAt(insertionPoint,
PR_FALSE);
NS_ASSERTION(curSheet, "There must be a sheet here!");
nsCOMPtr<nsIDOMStyleSheet> domSheet = do_QueryInterface(curSheet);
NS_ASSERTION(domSheet, "All the \"normal\" sheets implement nsIDOMStyleSheet");
nsCOMPtr<nsIDOMNode> 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 <meta> elements do not implement nsIStyleSheetLinkingElement;
// need to fix this for them to be ordered correctly.
nsCOMPtr<nsIStyleSheetLinkingElement>
linkingElement = do_QueryInterface(aLinkingContent);
if (linkingElement) {
linkingElement->SetStyleSheet(aSheet); // This sets the ownerNode on the sheet
}
aDocument->BeginUpdate(UPDATE_STYLE);
aDocument->InsertStyleSheetAt(aSheet, insertionPoint);
aDocument->EndUpdate(UPDATE_STYLE);
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<nsIInputStream> 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<nsIConverterInputStream> 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, 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<nsILoadGroup> loadGroup;
if (mDocument) {
loadGroup = mDocument->GetDocumentLoadGroup();
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<nsIChannel> 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<nsIHttpChannel> 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) {
nsIURI *documentURI = mDocument->GetDocumentURI();
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<nsIUnicharStreamLoader> 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,
PRBool& aCompleted)
{
LOG(("CSSLoaderImpl::ParseSheet"));
NS_PRECONDITION(aStream, "Must have data to parse");
NS_PRECONDITION(aLoadData, "Must have load data");
NS_PRECONDITION(aLoadData->mSheet, "Must have sheet to parse into");
aCompleted = PR_FALSE;
nsCOMPtr<nsICSSParser> parser;
nsresult 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<nsICSSStyleSheet> dummySheet;
// Push our load data on the stack so any kids can pick it up
mParsingDatas.AppendElement(aLoadData);
nsCOMPtr<nsIURI> uri;
aLoadData->mSheet->GetURL(*getter_AddRefs(uri));
rv = parser->Parse(aStream, uri, *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 <link> 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<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->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<nsIStyleSheetLinkingElement> owningElement(do_QueryInterface(aElement));
NS_ASSERTION(owningElement, "Element is not a style linking element!");
StyleSheetState state;
nsCOMPtr<nsICSSStyleSheet> 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, nsnull);
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;
}
NS_ADDREF(data);
// Parse completion releases the load data
return ParseSheet(aStream, data, 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
nsIURI *docURI = mDocument->GetDocumentURI();
if (!docURI) return NS_ERROR_FAILURE;
nsresult rv = CheckLoadAllowed(docURI, aURL, aElement);
if (NS_FAILED(rv)) return rv;
LOG((" Passed load check"));
StyleSheetState state;
nsCOMPtr<nsICSSStyleSheet> sheet;
rv = CreateSheet(aURL, aElement, PR_FALSE, state,
getter_AddRefs(sheet));
NS_ENSURE_SUCCESS(rv, rv);
rv = PrepareSheet(sheet, aTitle, aMedia, nsnull);
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<nsIStyleSheetLinkingElement> 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,
nsISupportsArray* 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<nsIURI> 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<nsICSSLoaderObserver> 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<nsICSSStyleSheet> sheet;
StyleSheetState state;
rv = CreateSheet(aURL, nsnull,
parentData ? parentData->mSyncLoad : PR_FALSE,
state, getter_AddRefs(sheet));
NS_ENSURE_SUCCESS(rv, rv);
const nsAString& empty = EmptyString();
rv = PrepareSheet(sheet, empty, empty, 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<nsICSSStyleSheet> sheet;
PRBool syncLoad = (aObserver == nsnull);
nsresult rv = CreateSheet(aURL, nsnull, syncLoad, state,
getter_AddRefs(sheet));
NS_ENSURE_SUCCESS(rv, rv);
const nsAString& empty = EmptyString();
rv = PrepareSheet(sheet, empty, empty, nsnull);
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;
}
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