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Issue #2691: Improve Parser State Handling

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erixreyes 2025-07-17 12:44:53 +08:00 • committed by roytam1
commit ea580ec54b
1 changed files with 13 additions and 19 deletions
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32
layout/style/nsCSSParser.cpp
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@ -5066,29 +5066,23 @@ CSSParserImpl::ParseSupportsSelector(bool& aConditionMet)
return true;
}
nsCSSScanner tempScanner(selectorText, 0);
css::ErrorReporter tempReporter(tempScanner, mSheet, mChildLoader, mSheetURI);
// isolate parser instance to avoid state corruption
CSSParserImpl tempParser;
tempParser.SetStyleSheet(mSheet);
tempParser.SetChildLoader(mChildLoader);
nsCSSScanner* savedScanner = mScanner;
css::ErrorReporter* savedReporter = mReporter;
mScanner = &tempScanner;
mReporter = &tempReporter;
nsCSSSelectorList* selectorList = nullptr;
// check support
SelectorParsingFlags flags = SelectorParsingFlags::eNone;
bool parseSuccess = ParseSelectorGroup(selectorList, flags);
mScanner = savedScanner;
mReporter = savedReporter;
if (parseSuccess && selectorList) {
aConditionMet = true;
nsCSSSelectorList* selectorList = nullptr;
bool supportSuccess = tempParser.ParseSelectorString(selectorText, mSheetURI, 0, &selectorList) == NS_OK;
// clean up
if (selectorList) {
delete selectorList;
} else {
aConditionMet = false;
}
aConditionMet = supportSuccess;
return true;
}