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 CSSVariableResolver::resolveVariableReference(CSSParserTokenRange range, Vector<CSSParserToken>& result)
{
range.consumeWhitespace();
ASSERT(range.peek().type() == IdentToken);
AtomicString variableName = range.consumeIncludingWhitespace().value();
ASSERT(range.atEnd() || (range.peek().type() == CommaToken));
CSSVariableData* variableData = valueForCustomProperty(variableName);
if (!variableData)
return resolveFallback(range, result);
result.appendVector(variableData->tokens());
Vector<CSSParserToken> trash;
resolveFallback(range, trash);
return true;
}
CSSVariableData* CSSVariableResolver::valueForCustomProperty(AtomicString name)
{
if (m_variablesSeen.contains(name)) {
m_cycleStartPoints.add(name);
return nullptr;
}
if (!m_styleVariableData)
return nullptr;
CSSVariableData* variableData = m_styleVariableData->getVariable(name);
if (!variableData)
return nullptr;
if (!variableData->needsVariableResolution())
return variableData;
RefPtr<CSSVariableData> newVariableData = resolveCustomProperty(name, *variableData);
m_styleVariableData->setVariable(name, newVariableData);
return newVariableData.get();
}
PassRefPtr<CSSVariableData> CSSVariableResolver::resolveCustomProperty(AtomicString name, const CSSVariableData& variableData)
{
ASSERT(variableData.needsVariableResolution());
Vector<CSSParserToken> tokens;
m_variablesSeen.add(name);
bool success = resolveTokenRange(variableData.tokens(), tokens);
m_variablesSeen.remove(name);
// The old variable data holds onto the backing string the new resolved CSSVariableData
// relies on. Ensure it will live beyond us overwriting the RefPtr in StyleVariableData.
ASSERT(variableData.refCount() > 1);
if (!success || !m_cycleStartPoints.isEmpty()) {
m_cycleStartPoints.remove(name);
return nullptr;
}
return CSSVariableData::createResolved(tokens, variableData);
}
bool CSSVariableData::operator==(const CSSVariableData& other) const
{
return tokens() == other.tokens();
}
