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ErrorReporter.cpp
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ErrorReporter.cpp
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* diagnostic reporting for CSS style sheet parser */
#include "mozilla/css/ErrorReporter.h"
#include "mozilla/css/Loader.h"
#include "mozilla/Preferences.h"
#include "mozilla/Services.h"
#include "nsCSSScanner.h"
#include "nsCSSStyleSheet.h"
#include "nsIConsoleService.h"
#include "nsIDocument.h"
#include "nsIFactory.h"
#include "nsIScriptError.h"
#include "nsIStringBundle.h"
#include "nsServiceManagerUtils.h"
#include "nsStyleUtil.h"
#include "nsThreadUtils.h"
#ifdef CSS_REPORT_PARSE_ERRORS
using mozilla::Preferences;
namespace services = mozilla::services;
namespace {
class ShortTermURISpecCache : public nsRunnable {
public:
ShortTermURISpecCache() : mPending(false) {}
nsString const& GetSpec(nsIURI* aURI) {
if (mURI != aURI) {
mURI = aURI;
nsAutoCString cSpec;
mURI->GetSpec(cSpec);
CopyUTF8toUTF16(cSpec, mSpec);
}
return mSpec;
}
bool IsInUse() const { return mURI != nullptr; }
bool IsPending() const { return mPending; }
void SetPending() { mPending = true; }
// When invoked as a runnable, zap the cache.
NS_IMETHOD Run() {
mURI = nullptr;
mSpec.Truncate();
mPending = false;
return NS_OK;
}
private:
nsCOMPtr<nsIURI> mURI;
nsString mSpec;
bool mPending;
};
}
static bool sReportErrors;
static nsIConsoleService *sConsoleService;
static nsIFactory *sScriptErrorFactory;
static nsIStringBundle *sStringBundle;
static ShortTermURISpecCache *sSpecCache;
#define CSS_ERRORS_PREF "layout.css.report_errors"
static bool
InitGlobals()
{
NS_ABORT_IF_FALSE(!sConsoleService && !sScriptErrorFactory && !sStringBundle,
"should not have been called");
if (NS_FAILED(Preferences::AddBoolVarCache(&sReportErrors, CSS_ERRORS_PREF,
true))) {
return false;
}
nsCOMPtr<nsIConsoleService> cs = do_GetService(NS_CONSOLESERVICE_CONTRACTID);
if (!cs) {
return false;
}
nsCOMPtr<nsIFactory> sf = do_GetClassObject(NS_SCRIPTERROR_CONTRACTID);
if (!sf) {
return false;
}
nsCOMPtr<nsIStringBundleService> sbs = services::GetStringBundleService();
if (!sbs) {
return false;
}
nsCOMPtr<nsIStringBundle> sb;
nsresult rv = sbs->CreateBundle("chrome://global/locale/css.properties",
getter_AddRefs(sb));
if (NS_FAILED(rv) || !sb) {
return false;
}
sConsoleService = cs.forget().get();
sScriptErrorFactory = sf.forget().get();
sStringBundle = sb.forget().get();
return true;
}
static inline bool
ShouldReportErrors()
{
if (!sConsoleService) {
if (!InitGlobals()) {
return false;
}
}
return sReportErrors;
}
namespace mozilla {
namespace css {
/* static */ void
ErrorReporter::ReleaseGlobals()
{
NS_IF_RELEASE(sConsoleService);
NS_IF_RELEASE(sScriptErrorFactory);
NS_IF_RELEASE(sStringBundle);
NS_IF_RELEASE(sSpecCache);
}
ErrorReporter::ErrorReporter(const nsCSSScanner& aScanner,
const nsCSSStyleSheet* aSheet,
const Loader* aLoader,
nsIURI* aURI)
: mScanner(&aScanner), mSheet(aSheet), mLoader(aLoader), mURI(aURI),
mInnerWindowID(0), mErrorLineNumber(0), mPrevErrorLineNumber(0),
mErrorColNumber(0)
{
}
ErrorReporter::~ErrorReporter()
{
// Schedule deferred cleanup for cached data. We want to strike a
// balance between performance and memory usage, so we only allow
// short-term caching.
if (sSpecCache && sSpecCache->IsInUse() && !sSpecCache->IsPending()) {
if (NS_FAILED(NS_DispatchToCurrentThread(sSpecCache))) {
// Peform the "deferred" cleanup immediately if the dispatch fails.
sSpecCache->Run();
} else {
sSpecCache->SetPending();
}
}
}
void
ErrorReporter::OutputError()
{
if (mError.IsEmpty()) {
return;
}
if (!ShouldReportErrors()) {
ClearError();
return;
}
if (mInnerWindowID == 0 && (mSheet || mLoader)) {
if (mSheet) {
mInnerWindowID = mSheet->FindOwningWindowInnerID();
}
if (mInnerWindowID == 0 && mLoader) {
nsIDocument* doc = mLoader->GetDocument();
if (doc) {
mInnerWindowID = doc->InnerWindowID();
}
}
// don't attempt this again, even if we failed
mSheet = nullptr;
mLoader = nullptr;
}
if (mFileName.IsEmpty()) {
if (mURI) {
if (!sSpecCache) {
sSpecCache = new ShortTermURISpecCache;
NS_ADDREF(sSpecCache);
}
mFileName = sSpecCache->GetSpec(mURI);
mURI = nullptr;
} else {
mFileName.AssignLiteral("from DOM");
}
}
nsresult rv;
nsCOMPtr<nsIScriptError> errorObject =
do_CreateInstance(sScriptErrorFactory, &rv);
if (NS_SUCCEEDED(rv)) {
rv = errorObject->InitWithWindowID(mError,
mFileName,
mErrorLine,
mErrorLineNumber,
mErrorColNumber,
nsIScriptError::warningFlag,
"CSS Parser",
mInnerWindowID);
if (NS_SUCCEEDED(rv)) {
sConsoleService->LogMessage(errorObject);
}
}
ClearError();
}
void
ErrorReporter::ClearError()
{
mError.Truncate();
}
void
ErrorReporter::AddToError(const nsString &aErrorText)
{
if (!ShouldReportErrors()) return;
if (mError.IsEmpty()) {
mError = aErrorText;
mErrorLineNumber = mScanner->GetLineNumber();
mErrorColNumber = mScanner->GetColumnNumber();
// Retrieve the error line once per line, and reuse the same nsString
// for all errors on that line. That causes the text of the line to
// be shared among all the nsIScriptError objects.
if (mErrorLine.IsEmpty() || mErrorLineNumber != mPrevErrorLineNumber) {
mErrorLine = mScanner->GetCurrentLine();
mPrevErrorLineNumber = mErrorLineNumber;
}
} else {
mError.AppendLiteral(" ");
mError.Append(aErrorText);
}
}
void
ErrorReporter::ReportUnexpected(const char *aMessage)
{
if (!ShouldReportErrors()) return;
nsAutoString str;
sStringBundle->GetStringFromName(NS_ConvertASCIItoUTF16(aMessage).get(),
getter_Copies(str));
AddToError(str);
}
void
ErrorReporter::ReportUnexpected(const char *aMessage,
const nsString &aParam)
{
if (!ShouldReportErrors()) return;
nsAutoString qparam;
nsStyleUtil::AppendEscapedCSSIdent(aParam, qparam);
const PRUnichar *params[1] = { qparam.get() };
nsAutoString str;
sStringBundle->FormatStringFromName(NS_ConvertASCIItoUTF16(aMessage).get(),
params, ArrayLength(params),
getter_Copies(str));
AddToError(str);
}
void
ErrorReporter::ReportUnexpected(const char *aMessage,
const nsCSSToken &aToken)
{
if (!ShouldReportErrors()) return;
nsAutoString tokenString;
aToken.AppendToString(tokenString);
const PRUnichar *params[1] = { tokenString.get() };
nsAutoString str;
sStringBundle->FormatStringFromName(NS_ConvertASCIItoUTF16(aMessage).get(),
params, ArrayLength(params),
getter_Copies(str));
AddToError(str);
}
void
ErrorReporter::ReportUnexpected(const char *aMessage,
const nsCSSToken &aToken,
PRUnichar aChar)
{
if (!ShouldReportErrors()) return;
nsAutoString tokenString;
aToken.AppendToString(tokenString);
const PRUnichar charStr[2] = { aChar, 0 };
const PRUnichar *params[2] = { tokenString.get(), charStr };
nsAutoString str;
sStringBundle->FormatStringFromName(NS_ConvertASCIItoUTF16(aMessage).get(),
params, ArrayLength(params),
getter_Copies(str));
AddToError(str);
}
void
ErrorReporter::ReportUnexpectedEOF(const char *aMessage)
{
if (!ShouldReportErrors()) return;
nsAutoString innerStr;
sStringBundle->GetStringFromName(NS_ConvertASCIItoUTF16(aMessage).get(),
getter_Copies(innerStr));
const PRUnichar *params[1] = { innerStr.get() };
nsAutoString str;
sStringBundle->FormatStringFromName(NS_LITERAL_STRING("PEUnexpEOF2").get(),
params, ArrayLength(params),
getter_Copies(str));
AddToError(str);
}
void
ErrorReporter::ReportUnexpectedEOF(PRUnichar aExpected)
{
if (!ShouldReportErrors()) return;
const PRUnichar expectedStr[] = {
PRUnichar('\''), aExpected, PRUnichar('\''), PRUnichar(0)
};
const PRUnichar *params[1] = { expectedStr };
nsAutoString str;
sStringBundle->FormatStringFromName(NS_LITERAL_STRING("PEUnexpEOF2").get(),
params, ArrayLength(params),
getter_Copies(str));
AddToError(str);
}
} // namespace css
} // namespace mozilla
#endif