bool SizesAttributeParser::parse(CSSParserTokenRange range)
{
// Split on a comma token and parse the result tokens as (media-condition, length) pairs
while (!range.atEnd()) {
const CSSParserToken* mediaConditionStart = &range.peek();
// The length is the last component value before the comma which isn't whitespace or a comment
const CSSParserToken* lengthTokenStart = &range.peek();
const CSSParserToken* lengthTokenEnd = &range.peek();
while (!range.atEnd() && range.peek().type() != CommaToken) {
lengthTokenStart = &range.peek();
range.consumeComponentValue();
lengthTokenEnd = &range.peek();
range.consumeWhitespace();
}
range.consume();
float length;
if (!calculateLengthInPixels(range.makeSubRange(lengthTokenStart, lengthTokenEnd), length))
continue;
RefPtrWillBeRawPtr<MediaQuerySet> mediaCondition = MediaQueryParser::parseMediaCondition(range.makeSubRange(mediaConditionStart, lengthTokenStart));
if (!mediaCondition || !mediaConditionMatches(mediaCondition))
continue;
m_length = length;
m_lengthWasSet = true;
return true;
}
return false;
}
bool CSSVariableData::checkVariablesForCyclesWithRange(CSSParserTokenRange range, CustomPropertyValueMap& customProperties, HashSet<AtomicString>& seenProperties, HashSet<AtomicString>& invalidProperties) const
{
while (!range.atEnd()) {
if (range.peek().functionId() == CSSValueVar) {
CSSParserTokenRange block = range.consumeBlock();
block.consumeWhitespace();
ASSERT(block.peek().type() == IdentToken);
AtomicString variableName = block.consumeIncludingWhitespace().value().toAtomicString();
ASSERT(block.atEnd() || block.peek().type() == CommaToken);
if (seenProperties.contains(variableName))
return false;
RefPtr<CSSCustomPropertyValue> value = customProperties.get(variableName);
if (value && value->containsVariables() && !value->checkVariablesForCycles(variableName, customProperties, seenProperties, invalidProperties))
return false;
if (range.peek().type() == CommaToken) {
// Fallback.
range.consume();
return checkVariablesForCyclesWithRange(block, customProperties, seenProperties, invalidProperties);
}
} else
range.consume();
}
return true;
}
PassRefPtrWillBeRawPtr<StyleRuleBase> CSSParserImpl::consumeAtRule(CSSParserTokenRange& range, AllowedRulesType allowedRules)
{
ASSERT(range.peek().type() == AtKeywordToken);
const CSSParserString& name = range.consume().value();
const CSSParserToken* preludeStart = &range.peek();
while (!range.atEnd() && range.peek().type() != LeftBraceToken && range.peek().type() != SemicolonToken)
range.consumeComponentValue();
CSSParserTokenRange prelude = range.makeSubRange(preludeStart, &range.peek());
CSSAtRuleID id = cssAtRuleID(name);
if (id != CSSAtRuleInvalid && m_context.useCounter())
countAtRule(m_context.useCounter(), id);
if (range.atEnd() || range.peek().type() == SemicolonToken) {
range.consume();
if (allowedRules == AllowCharsetRules && id == CSSAtRuleCharset)
return consumeCharsetRule(prelude);
if (allowedRules <= AllowImportRules && id == CSSAtRuleImport)
return consumeImportRule(prelude);
if (allowedRules <= AllowNamespaceRules && id == CSSAtRuleNamespace)
return consumeNamespaceRule(prelude);
return nullptr; // Parse error, unrecognised at-rule without block
}
CSSParserTokenRange block = range.consumeBlock();
if (allowedRules == KeyframeRules)
return nullptr; // Parse error, no at-rules supported inside @keyframes
if (allowedRules == NoRules)
return nullptr; // Parse error, no at-rules supported inside declaration lists
ASSERT(allowedRules <= RegularRules);
switch (id) {
case CSSAtRuleMedia:
return consumeMediaRule(prelude, block);
case CSSAtRuleSupports:
return consumeSupportsRule(prelude, block);
case CSSAtRuleViewport:
return consumeViewportRule(prelude, block);
case CSSAtRuleFontFace:
return consumeFontFaceRule(prelude, block);
case CSSAtRuleWebkitKeyframes:
return consumeKeyframesRule(true, prelude, block);
case CSSAtRuleKeyframes:
return consumeKeyframesRule(false, prelude, block);
case CSSAtRulePage:
return consumePageRule(prelude, block);
default:
return nullptr; // Parse error, unrecognised at-rule with block
}
}
void CSSParserImpl::consumeDeclarationList(CSSParserTokenRange range, StyleRule::Type ruleType)
{
ASSERT(m_parsedProperties.isEmpty());
bool useObserver = m_observerWrapper && ruleType == StyleRule::Style;
if (useObserver) {
m_observerWrapper->observer().startRuleBody(m_observerWrapper->previousTokenStartOffset(range));
m_observerWrapper->skipCommentsBefore(range, true);
}
while (!range.atEnd()) {
switch (range.peek().type()) {
case WhitespaceToken:
case SemicolonToken:
range.consume();
break;
case IdentToken: {
const CSSParserToken* declarationStart = &range.peek();
if (useObserver)
m_observerWrapper->yieldCommentsBefore(range);
while (!range.atEnd() && range.peek().type() != SemicolonToken)
range.consumeComponentValue();
consumeDeclaration(range.makeSubRange(declarationStart, &range.peek()), ruleType);
if (useObserver)
m_observerWrapper->skipCommentsBefore(range, false);
break;
}
case AtKeywordToken: {
RefPtrWillBeRawPtr<StyleRuleBase> rule = consumeAtRule(range, NoRules);
ASSERT_UNUSED(rule, !rule);
break;
}
default: // Parse error, unexpected token in declaration list
while (!range.atEnd() && range.peek().type() != SemicolonToken)
range.consumeComponentValue();
break;
}
}
// Yield remaining comments
if (useObserver) {
m_observerWrapper->yieldCommentsBefore(range);
m_observerWrapper->observer().endRuleBody(m_observerWrapper->endOffset(range));
}
}
void CSSVariableResolver::resolveApplyAtRule(CSSParserTokenRange& range,
Vector<CSSParserToken>& result)
{
ASSERT(range.peek().type() == AtKeywordToken && range.peek().valueEqualsIgnoringASCIICase("apply"));
range.consumeIncludingWhitespace();
const CSSParserToken& variableName = range.consumeIncludingWhitespace();
// TODO(timloh): Should we actually be consuming this?
if (range.peek().type() == SemicolonToken)
range.consume();
CSSVariableData* variableData = valueForCustomProperty(variableName.value());
if (!variableData)
return; // Invalid custom property
CSSParserTokenRange rule = variableData->tokenRange();
rule.consumeWhitespace();
if (rule.peek().type() != LeftBraceToken)
return;
CSSParserTokenRange ruleContents = rule.consumeBlock();
rule.consumeWhitespace();
if (!rule.atEnd())
return;
result.appendRange(ruleContents.begin(), ruleContents.end());
}
bool parseValueMultiplicativeExpression(CSSParserTokenRange& tokens, int depth, Value* result)
{
if (checkDepthAndIndex(&depth, tokens) != OK)
return false;
if (!parseValueTerm(tokens, depth, result))
return false;
while (!tokens.atEnd()) {
char operatorCharacter = operatorValue(tokens.peek());
if (operatorCharacter != CalcMultiply && operatorCharacter != CalcDivide)
break;
tokens.consumeIncludingWhitespace();
Value rhs;
if (!parseValueTerm(tokens, depth, &rhs))
return false;
result->value = CSSCalcBinaryOperation::createSimplified(result->value, rhs.value, static_cast<CalcOperator>(operatorCharacter));
if (!result->value)
return false;
}
return true;
}
bool parseAdditiveValueExpression(CSSParserTokenRange& tokens, int depth, Value* result)
{
if (checkDepthAndIndex(&depth, tokens) != OK)
return false;
if (!parseValueMultiplicativeExpression(tokens, depth, result))
return false;
while (!tokens.atEnd()) {
char operatorCharacter = operatorValue(tokens.peek());
if (operatorCharacter != CalcAdd && operatorCharacter != CalcSubtract)
break;
if ((&tokens.peek() - 1)->type() != WhitespaceToken)
return false; // calc(1px+ 2px) is invalid
tokens.consume();
if (tokens.peek().type() != WhitespaceToken)
return false; // calc(1px +2px) is invalid
tokens.consumeIncludingWhitespace();
Value rhs;
if (!parseValueMultiplicativeExpression(tokens, depth, &rhs))
return false;
result->value = CSSCalcBinaryOperation::createSimplified(result->value, rhs.value, static_cast<CalcOperator>(operatorCharacter));
if (!result->value)
return false;
}
return true;
}
PassRefPtrWillBeRawPtr<StyleRuleKeyframes> CSSParserImpl::consumeKeyframesRule(bool webkitPrefixed, CSSParserTokenRange prelude, CSSParserTokenRange block)
{
prelude.consumeWhitespace();
const CSSParserToken& nameToken = prelude.consumeIncludingWhitespace();
if (!prelude.atEnd())
return nullptr; // Parse error; expected single non-whitespace token in @keyframes header
String name;
if (nameToken.type() == IdentToken) {
name = nameToken.value();
} else if (nameToken.type() == StringToken && webkitPrefixed) {
if (m_context.useCounter())
m_context.useCounter()->count(UseCounter::QuotedKeyframesRule);
name = nameToken.value();
} else {
return nullptr; // Parse error; expected ident token in @keyframes header
}
if (m_observerWrapper) {
unsigned endOffset = m_observerWrapper->endOffset(prelude);
m_observerWrapper->observer().startRuleHeader(StyleRule::Keyframes, m_observerWrapper->startOffset(prelude));
m_observerWrapper->observer().endRuleHeader(m_observerWrapper->endOffset(prelude));
m_observerWrapper->observer().startRuleBody(endOffset);
m_observerWrapper->observer().endRuleBody(endOffset);
}
RefPtrWillBeRawPtr<StyleRuleKeyframes> keyframeRule = StyleRuleKeyframes::create();
consumeRuleList(block, KeyframesRuleList, [keyframeRule](PassRefPtrWillBeRawPtr<StyleRuleBase> keyframe) {
keyframeRule->parserAppendKeyframe(toStyleRuleKeyframe(keyframe.get()));
});
keyframeRule->setName(name);
keyframeRule->setVendorPrefixed(webkitPrefixed);
return keyframeRule.release();
}
static bool parseRGBParameters(CSSParserTokenRange& range, RGBA32& result, bool parseAlpha)
{
ASSERT(range.peek().functionId() == CSSValueRgb || range.peek().functionId() == CSSValueRgba);
CSSParserTokenRange args = consumeFunction(range);
CSSPrimitiveValue* colorParameter = consumeInteger(args);
if (!colorParameter)
colorParameter = consumePercent(args, ValueRangeAll);
if (!colorParameter)
return false;
const bool isPercent = colorParameter->isPercentage();
int colorArray[3];
colorArray[0] = clampRGBComponent(*colorParameter);
for (int i = 1; i < 3; i++) {
if (!consumeCommaIncludingWhitespace(args))
return false;
colorParameter = isPercent ? consumePercent(args, ValueRangeAll) : consumeInteger(args);
if (!colorParameter)
return false;
colorArray[i] = clampRGBComponent(*colorParameter);
}
if (parseAlpha) {
if (!consumeCommaIncludingWhitespace(args))
return false;
double alpha;
if (!consumeNumberRaw(args, alpha))
return false;
// Convert the floating pointer number of alpha to an integer in the range [0, 256),
// with an equal distribution across all 256 values.
int alphaComponent = static_cast<int>(clampTo<double>(alpha, 0.0, 1.0) * nextafter(256.0, 0.0));
result = makeRGBA(colorArray[0], colorArray[1], colorArray[2], alphaComponent);
} else {
result = makeRGB(colorArray[0], colorArray[1], colorArray[2]);
}
return args.atEnd();
}
bool isValidVariableReference(CSSParserTokenRange range)
{
range.consumeWhitespace();
if (!CSSVariableParser::isValidVariableName(range.consumeIncludingWhitespace()))
return false;
if (range.atEnd())
return true;
if (range.consume().type() != CommaToken)
return false;
if (range.atEnd())
return false;
bool hasReferences = false;
return classifyBlock(range, hasReferences);
}
static bool parseHSLParameters(CSSParserTokenRange& range, RGBA32& result, bool parseAlpha)
{
ASSERT(range.peek().functionId() == CSSValueHsl || range.peek().functionId() == CSSValueHsla);
CSSParserTokenRange args = consumeFunction(range);
CSSPrimitiveValue* hslValue = consumeNumber(args, ValueRangeAll);
if (!hslValue)
return false;
double colorArray[3];
colorArray[0] = (((hslValue->getIntValue() % 360) + 360) % 360) / 360.0;
for (int i = 1; i < 3; i++) {
if (!consumeCommaIncludingWhitespace(args))
return false;
hslValue = consumePercent(args, ValueRangeAll);
if (!hslValue)
return false;
double doubleValue = hslValue->getDoubleValue();
colorArray[i] = clampTo<double>(doubleValue, 0.0, 100.0) / 100.0; // Needs to be value between 0 and 1.0.
}
double alpha = 1.0;
if (parseAlpha) {
if (!consumeCommaIncludingWhitespace(args))
return false;
if (!consumeNumberRaw(args, alpha))
return false;
alpha = clampTo<double>(alpha, 0.0, 1.0);
}
result = makeRGBAFromHSLA(colorArray[0], colorArray[1], colorArray[2], alpha);
return args.atEnd();
}
bool CSSVariableData::resolveVariableFallback(const CustomPropertyValueMap& customProperties, CSSParserTokenRange range, Vector<CSSParserToken>& result) const
{
if (range.atEnd())
return false;
ASSERT(range.peek().type() == CommaToken);
range.consume();
return resolveTokenRange(customProperties, range, result);
}
bool CSSVariableResolver::resolveFallback(CSSParserTokenRange range, Vector<CSSParserToken>& result)
{
if (range.atEnd())
return false;
ASSERT(range.peek().type() == CommaToken);
range.consume();
return resolveTokenRange(range, result);
}
PassRefPtrWillBeRawPtr<StyleRuleCharset> CSSParserImpl::consumeCharsetRule(CSSParserTokenRange prelude)
{
prelude.consumeWhitespace();
const CSSParserToken& string = prelude.consumeIncludingWhitespace();
if (string.type() != StringToken || !prelude.atEnd())
return nullptr; // Parse error, expected a single string
return StyleRuleCharset::create();
}
PassRefPtrWillBeRawPtr<StyleRuleBase> CSSParserImpl::consumeAtRule(CSSParserTokenRange& range, AllowedRulesType allowedRules)
{
ASSERT(range.peek().type() == AtKeywordToken);
const CSSParserString& name = range.consume().value();
const CSSParserToken* preludeStart = &range.peek();
while (!range.atEnd() && range.peek().type() != LeftBraceToken && range.peek().type() != SemicolonToken)
range.consumeComponentValue();
CSSParserTokenRange prelude = range.makeSubRange(preludeStart, &range.peek());
if (range.atEnd() || range.peek().type() == SemicolonToken) {
range.consume();
if (allowedRules == AllowCharsetRules && name.equalIgnoringCase("charset"))
return consumeCharsetRule(prelude);
if (allowedRules <= AllowImportRules && name.equalIgnoringCase("import"))
return consumeImportRule(prelude);
if (allowedRules <= AllowNamespaceRules && name.equalIgnoringCase("namespace"))
return consumeNamespaceRule(prelude);
return nullptr; // Parse error, unrecognised at-rule without block
}
CSSParserTokenRange block = range.consumeBlock();
if (allowedRules == KeyframeRules)
return nullptr; // Parse error, no at-rules supported inside @keyframes
if (allowedRules == NoRules)
return nullptr; // Parse error, no at-rules supported inside declaration lists
ASSERT(allowedRules <= RegularRules);
if (name.equalIgnoringCase("media"))
return consumeMediaRule(prelude, block);
if (name.equalIgnoringCase("supports"))
return consumeSupportsRule(prelude, block);
if (name.equalIgnoringCase("viewport"))
return consumeViewportRule(prelude, block);
if (name.equalIgnoringCase("font-face"))
return consumeFontFaceRule(prelude, block);
if (name.equalIgnoringCase("-webkit-keyframes"))
return consumeKeyframesRule(true, prelude, block);
if (name.equalIgnoringCase("keyframes"))
return consumeKeyframesRule(false, prelude, block);
if (name.equalIgnoringCase("page"))
return consumePageRule(prelude, block);
return nullptr; // Parse error, unrecognised at-rule with block
}
std::unique_ptr<CSSParserSelector> CSSSelectorParser::consumeAttribute(
CSSParserTokenRange& range) {
ASSERT(range.peek().type() == LeftBracketToken);
CSSParserTokenRange block = range.consumeBlock();
block.consumeWhitespace();
AtomicString namespacePrefix;
AtomicString attributeName;
if (!consumeName(block, attributeName, namespacePrefix))
return nullptr;
block.consumeWhitespace();
if (m_context.isHTMLDocument())
attributeName = attributeName.lower();
AtomicString namespaceURI = determineNamespace(namespacePrefix);
if (namespaceURI.isNull())
return nullptr;
QualifiedName qualifiedName =
namespacePrefix.isNull()
? QualifiedName(nullAtom, attributeName, nullAtom)
: QualifiedName(namespacePrefix, attributeName, namespaceURI);
std::unique_ptr<CSSParserSelector> selector = CSSParserSelector::create();
if (block.atEnd()) {
selector->setAttribute(qualifiedName, CSSSelector::CaseSensitive);
selector->setMatch(CSSSelector::AttributeSet);
return selector;
}
selector->setMatch(consumeAttributeMatch(block));
const CSSParserToken& attributeValue = block.consumeIncludingWhitespace();
if (attributeValue.type() != IdentToken &&
attributeValue.type() != StringToken)
return nullptr;
selector->setValue(attributeValue.value().toAtomicString());
selector->setAttribute(qualifiedName, consumeAttributeFlags(block));
if (!block.atEnd())
return nullptr;
return selector;
}
PassRefPtrWillBeRawPtr<CSSCalcExpressionNode> parseCalc(CSSParserTokenRange tokens)
{
Value result;
tokens.consumeWhitespace();
bool ok = parseValueExpression(tokens, 0, &result);
if (!ok || !tokens.atEnd())
return nullptr;
return result.value;
}
static ParseState checkDepthAndIndex(int* depth, CSSParserTokenRange tokens)
{
(*depth)++;
if (tokens.atEnd())
return NoMoreTokens;
if (*depth > maxExpressionDepth)
return TooDeep;
return OK;
}
CSSSupportsParser::SupportsResult CSSSupportsParser::consumeCondition(
CSSParserTokenRange range) {
if (range.peek().type() == IdentToken)
return consumeNegation(range);
bool result;
ClauseType clauseType = Unresolved;
while (true) {
SupportsResult nextResult = consumeConditionInParenthesis(range);
if (nextResult == Invalid)
return Invalid;
bool nextSupported = nextResult;
if (clauseType == Unresolved)
result = nextSupported;
else if (clauseType == Conjunction)
result &= nextSupported;
else
result |= nextSupported;
if (range.atEnd())
break;
if (range.consumeIncludingWhitespace().type() != WhitespaceToken)
return Invalid;
if (range.atEnd())
break;
const CSSParserToken& token = range.consume();
if (token.type() != IdentToken)
return Invalid;
if (clauseType == Unresolved)
clauseType = token.value().length() == 3 ? Conjunction : Disjunction;
if ((clauseType == Conjunction &&
!equalIgnoringASCIICase(token.value(), "and")) ||
(clauseType == Disjunction &&
!equalIgnoringASCIICase(token.value(), "or")))
return Invalid;
if (range.consumeIncludingWhitespace().type() != WhitespaceToken)
return Invalid;
}
return result ? Supported : Unsupported;
}
static void observeSelectors(CSSParserObserverWrapper& wrapper, CSSParserTokenRange selectors)
{
// This is easier than hooking into the CSSSelectorParser
selectors.consumeWhitespace();
CSSParserTokenRange originalRange = selectors;
wrapper.observer().startRuleHeader(StyleRule::Style, wrapper.startOffset(originalRange));
while (!selectors.atEnd()) {
const CSSParserToken* selectorStart = &selectors.peek();
while (!selectors.atEnd() && selectors.peek().type() != CommaToken)
selectors.consumeComponentValue();
CSSParserTokenRange selector = selectors.makeSubRange(selectorStart, &selectors.peek());
selectors.consumeIncludingWhitespace();
wrapper.observer().observeSelector(wrapper.startOffset(selector), wrapper.endOffset(selector));
}
wrapper.observer().endRuleHeader(wrapper.endOffset(originalRange));
}
bool CSSVariableData::resolveTokenRange(const CustomPropertyValueMap& customProperties, CSSParserTokenRange range, Vector<CSSParserToken>& result) const
{
bool success = true;
while (!range.atEnd()) {
if (range.peek().functionId() == CSSValueVar)
success &= resolveVariableReference(customProperties, range.consumeBlock(), result);
else
result.append(range.consume());
}
return success;
}
PassRefPtrWillBeRawPtr<StyleRuleBase> CSSParserImpl::consumeQualifiedRule(CSSParserTokenRange& range, AllowedRulesType allowedRules)
{
const CSSParserToken* preludeStart = &range.peek();
while (!range.atEnd() && range.peek().type() != LeftBraceToken)
range.consumeComponentValue();
if (range.atEnd())
return nullptr; // Parse error, EOF instead of qualified rule block
CSSParserTokenRange prelude = range.makeSubRange(preludeStart, &range.peek());
CSSParserTokenRange block = range.consumeBlock();
if (allowedRules <= RegularRules)
return consumeStyleRule(prelude, block);
if (allowedRules == KeyframeRules)
return consumeKeyframeStyleRule(prelude, block);
ASSERT_NOT_REACHED();
return nullptr;
}
PassRefPtrWillBeRawPtr<StyleRulePage> CSSParserImpl::consumePageRule(CSSParserTokenRange prelude, CSSParserTokenRange block)
{
// We only support a small subset of the css-page spec.
prelude.consumeWhitespace();
AtomicString typeSelector;
if (prelude.peek().type() == IdentToken)
typeSelector = prelude.consume().value();
AtomicString pseudo;
if (prelude.peek().type() == ColonToken) {
prelude.consume();
if (prelude.peek().type() != IdentToken)
return nullptr; // Parse error; expected ident token following colon in @page header
pseudo = prelude.consume().value();
}
prelude.consumeWhitespace();
if (!prelude.atEnd())
return nullptr; // Parse error; extra tokens in @page header
OwnPtr<CSSParserSelector> selector;
if (!typeSelector.isNull() && pseudo.isNull()) {
selector = CSSParserSelector::create(QualifiedName(nullAtom, typeSelector, m_defaultNamespace));
} else {
selector = CSSParserSelector::create();
if (!pseudo.isNull()) {
selector->setMatch(CSSSelector::PagePseudoClass);
selector->setValue(pseudo.lower());
if (selector->pseudoType() == CSSSelector::PseudoUnknown)
return nullptr; // Parse error; unknown page pseudo-class
}
if (!typeSelector.isNull())
selector->prependTagSelector(QualifiedName(nullAtom, typeSelector, m_defaultNamespace));
}
if (m_observerWrapper) {
unsigned endOffset = m_observerWrapper->endOffset(prelude);
m_observerWrapper->observer().startRuleHeader(StyleRule::Page, m_observerWrapper->startOffset(prelude));
m_observerWrapper->observer().endRuleHeader(endOffset);
}
selector->setForPage();
RefPtrWillBeRawPtr<StyleRulePage> pageRule = StyleRulePage::create();
Vector<OwnPtr<CSSParserSelector>> selectorVector;
selectorVector.append(selector.release());
pageRule->parserAdoptSelectorVector(selectorVector);
consumeDeclarationList(block, StyleRule::Style);
pageRule->setProperties(createStylePropertySet(m_parsedProperties, m_context.mode()));
m_parsedProperties.clear();
return pageRule.release();
}
PassRefPtrWillBeRawPtr<StyleRuleBase> CSSParserImpl::parseRule(const String& string, const CSSParserContext& context, StyleSheetContents* styleSheet, AllowedRulesType allowedRules)
{
CSSParserImpl parser(context, styleSheet);
CSSTokenizer::Scope scope(string);
CSSParserTokenRange range = scope.tokenRange();
range.consumeWhitespace();
if (range.atEnd())
return nullptr; // Parse error, empty rule
RefPtrWillBeRawPtr<StyleRuleBase> rule;
if (range.peek().type() == AtKeywordToken)
rule = parser.consumeAtRule(range, allowedRules);
else
rule = parser.consumeQualifiedRule(range, allowedRules);
if (!rule)
return nullptr; // Parse error, failed to consume rule
range.consumeWhitespace();
if (!rule || !range.atEnd())
return nullptr; // Parse error, trailing garbage
return rule;
}
void CSSSelectorParser::parseSelector(CSSParserTokenRange range, const CSSParserContext& context, const AtomicString& defaultNamespace, StyleSheetContents* styleSheet, CSSSelectorList& output)
{
CSSSelectorParser parser(context, defaultNamespace, styleSheet);
range.consumeWhitespace();
CSSSelectorList result;
parser.consumeComplexSelectorList(range, result);
if (range.atEnd()) {
output.adopt(result);
recordSelectorStats(context, output);
}
ASSERT(!(output.isValid() && parser.m_failedParsing));
}
CSSSupportsParser::SupportsResult CSSSupportsParser::consumeNegation(
CSSParserTokenRange range) {
ASSERT(range.peek().type() == IdentToken);
if (!equalIgnoringASCIICase(range.consume().value(), "not"))
return Invalid;
if (range.consumeIncludingWhitespace().type() != WhitespaceToken)
return Invalid;
SupportsResult result = consumeConditionInParenthesis(range);
range.consumeWhitespace();
if (!range.atEnd() || result == Invalid)
return Invalid;
return result ? Unsupported : Supported;
}
CSSSelectorList CSSSelectorParser::parseSelector(
CSSParserTokenRange range,
const CSSParserContext& context,
StyleSheetContents* styleSheet) {
CSSSelectorParser parser(context, styleSheet);
range.consumeWhitespace();
CSSSelectorList result = parser.consumeComplexSelectorList(range);
if (!range.atEnd())
return CSSSelectorList();
recordSelectorStats(context, result);
return result;
}
bool CSSParserImpl::consumeRuleList(CSSParserTokenRange range, RuleListType ruleListType, const T callback)
{
AllowedRulesType allowedRules = RegularRules;
switch (ruleListType) {
case TopLevelRuleList:
allowedRules = AllowCharsetRules;
break;
case RegularRuleList:
allowedRules = RegularRules;
break;
case KeyframesRuleList:
allowedRules = KeyframeRules;
break;
default:
ASSERT_NOT_REACHED();
}
bool seenRule = false;
bool firstRuleValid = false;
while (!range.atEnd()) {
RefPtrWillBeRawPtr<StyleRuleBase> rule;
switch (range.peek().type()) {
case WhitespaceToken:
range.consumeWhitespace();
continue;
case AtKeywordToken:
rule = consumeAtRule(range, allowedRules);
break;
case CDOToken:
case CDCToken:
if (ruleListType == TopLevelRuleList) {
range.consume();
continue;
}
// fallthrough
default:
rule = consumeQualifiedRule(range, allowedRules);
break;
}
if (!seenRule) {
seenRule = true;
firstRuleValid = rule;
}
if (rule) {
allowedRules = computeNewAllowedRules(allowedRules, rule.get());
callback(rule.release());
}
}
return firstRuleValid;
}
PassRefPtrWillBeRawPtr<CSSCustomPropertyDeclaration> CSSVariableParser::parseDeclarationValue(const AtomicString& variableName, CSSParserTokenRange range)
{
if (range.atEnd())
return nullptr;
bool hasReferences;
CSSValueID type = classifyVariableRange(range, hasReferences);
if (type == CSSValueInvalid)
return nullptr;
if (type == CSSValueInternalVariableValue)
return CSSCustomPropertyDeclaration::create(variableName, CSSVariableData::create(range, hasReferences));
return CSSCustomPropertyDeclaration::create(variableName, type);
}
PassRefPtrWillBeRawPtr<StyleRuleNamespace> CSSParserImpl::consumeNamespaceRule(CSSParserTokenRange prelude)
{
prelude.consumeWhitespace();
AtomicString namespacePrefix;
if (prelude.peek().type() == IdentToken)
namespacePrefix = prelude.consumeIncludingWhitespace().value();
AtomicString uri(consumeStringOrURI(prelude));
prelude.consumeWhitespace();
if (uri.isNull() || !prelude.atEnd())
return nullptr; // Parse error, expected string or URI
return StyleRuleNamespace::create(namespacePrefix, uri);
}