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Issue #2691: Implement ParseSupportsSelector

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erixreyes 2025-07-09 06:44:26 +08:00 • committed by roytam1
commit 8be86514f0
1 changed files with 107 additions and 0 deletions
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107
layout/style/nsCSSParser.cpp
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@ -755,6 +755,7 @@ protected:
bool ParseSupportsConditionTermsAfterOperator(
bool& aConditionMet,
SupportsConditionTermOperator aOperator);
bool ParseSupportsSelector(bool& aConditionMet);
bool ParseCounterStyleRule(RuleAppendFunc aAppendFunc, void* aProcessData);
bool ParseCounterStyleName(nsAString& aName, bool aForDefinition);
@ -4784,6 +4785,11 @@ CSSParserImpl::ParseSupportsConditionInParens(bool& aConditionMet)
return ParseSupportsMozBoolPrefName(aConditionMet);
}
if (mToken.mType == eCSSToken_Function &&
mToken.mIdent.LowerCaseEqualsLiteral("selector")) {
return ParseSupportsSelector(aConditionMet);
}
if (mToken.mType == eCSSToken_Function ||
mToken.mType == eCSSToken_Bad_URL) {
if (!SkipUntil(')')) {
@ -4844,6 +4850,105 @@ CSSParserImpl::ParseSupportsMozBoolPrefName(bool& aConditionMet)
return true;
}
// supports_selector
// : 'selector(' single_selector ')'
// ;
bool
CSSParserImpl::ParseSupportsSelector(bool& aConditionMet)
{
aConditionMet = false;
nsAutoString selectorText;
bool foundClosingParen = false;
bool hasContent = false;
for (;;) {
if (!GetToken(true)) {
return false; // fail unexpected EOF
}
if (mToken.IsSymbol(')')) {
foundClosingParen = true;
break;
}
hasContent = true;
bool needSpace = false;
if (!selectorText.IsEmpty()) {
char16_t lastChar = selectorText.Last();
if (lastChar != ':' && lastChar != '.' && lastChar != '#' && lastChar != '[' && lastChar != '(') {
needSpace = true;
}
}
if (mToken.mType == eCSSToken_Ident) {
if (needSpace) selectorText.Append(' ');
selectorText.Append(mToken.mIdent);
} else if (mToken.mType == eCSSToken_AtKeyword) {
if (needSpace) selectorText.Append(' ');
selectorText.Append('@');
selectorText.Append(mToken.mIdent);
} else if (mToken.mType == eCSSToken_Hash) {
if (needSpace) selectorText.Append(' ');
selectorText.Append('#');
selectorText.Append(mToken.mIdent);
} else if (mToken.mType == eCSSToken_Symbol) {
selectorText.Append(mToken.mSymbol);
} else if (mToken.mType == eCSSToken_String) {
if (needSpace) selectorText.Append(' ');
selectorText.Append('"');
selectorText.Append(mToken.mIdent);
selectorText.Append('"');
} else if (mToken.mType == eCSSToken_Function) {
if (needSpace) selectorText.Append(' ');
selectorText.Append(mToken.mIdent);
selectorText.Append('(');
} else {
if (!mToken.mIdent.IsEmpty()) {
if (needSpace) selectorText.Append(' ');
selectorText.Append(mToken.mIdent);
}
}
}
if (!foundClosingParen) {
return false;
}
if (!hasContent) {
aConditionMet = false;
return true;
}
selectorText.CompressWhitespace(true, true);
// basic validation
// reject issues like multiple selectors (comma-separated)
if (selectorText.FindChar(',') >= 0) {
aConditionMet = false;
} else if (selectorText.IsEmpty()) {
aConditionMet = false;
} else {
// assume basic selectors, pseudo-elements, and compound selectors to be true
aConditionMet = true;
// special case: reject obviously unsupported pseudo-elements
if (selectorText.Find(NS_LITERAL_STRING("::-webkit-")) >= 0) {
aConditionMet = false;
}
}
return true;
}
// supports_condition_in_parens_inside_parens
// : core_declaration
// | supports_condition_negation
@ -4912,6 +5017,8 @@ CSSParserImpl::ParseSupportsConditionInParensInsideParens(bool& aConditionMet)
ParseSupportsConditionTerms(aConditionMet);
}
// supports_condition_terms
// : S+ 'and' supports_condition_terms_after_operator('and')
// | S+ 'or' supports_condition_terms_after_operator('or')