PassRefPtrWillBeRawPtr<XPathResult> XPathExpression::evaluate(Node* contextNode, unsigned short type, XPathResult*, ExceptionState& exceptionState)
{
if (!contextNode) {
exceptionState.throwDOMException(NotSupportedError, "The context node provided is null.");
return nullptr;
}
if (!isValidContextNode(contextNode)) {
exceptionState.throwDOMException(NotSupportedError, "The node provided is '" + contextNode->nodeName() + "', which is not a valid context node type.");
return nullptr;
}
EvaluationContext evaluationContext(*contextNode);
RefPtrWillBeRawPtr<XPathResult> result = XPathResult::create(evaluationContext, m_topExpression->evaluate(evaluationContext));
if (evaluationContext.hadTypeConversionError) {
// It is not specified what to do if type conversion fails while evaluating an expression.
exceptionState.throwDOMException(SyntaxError, "Type conversion failed while evaluating the expression.");
return nullptr;
}
if (type != XPathResult::ANY_TYPE) {
result->convertTo(type, exceptionState);
if (exceptionState.hadException())
return nullptr;
}
return result;
}
PassRefPtrWillBeRawPtr<XPathResult> XPathExpression::evaluate(Node* contextNode, unsigned short type, XPathResult*, ExceptionState& exceptionState)
{
if (!contextNode) {
exceptionState.throwDOMException(NotSupportedError, "The context node provided is null.");
return nullptr;
}
if (!isValidContextNode(contextNode)) {
exceptionState.throwDOMException(NotSupportedError, "The node provided is '" + contextNode->nodeName() + "', which is not a valid context node type.");
return nullptr;
}
EvaluationContext& evaluationContext = Expression::evaluationContext();
evaluationContext.node = contextNode;
evaluationContext.size = 1;
evaluationContext.position = 1;
evaluationContext.hadTypeConversionError = false;
RefPtrWillBeRawPtr<XPathResult> result = XPathResult::create(&contextNode->document(), m_topExpression->evaluate());
evaluationContext.node = nullptr; // Do not hold a reference to the context node, as this may prevent the whole document from being destroyed in time.
if (evaluationContext.hadTypeConversionError) {
// It is not specified what to do if type conversion fails while evaluating an expression.
exceptionState.throwDOMException(SyntaxError, "Type conversion failed while evaluating the expression.");
return nullptr;
}
if (type != XPathResult::ANY_TYPE) {
result->convertTo(type, exceptionState);
if (exceptionState.hadException())
return nullptr;
}
return result;
}
