#include "config.h"
#include "XPathResult.h"
#if XPATH_SUPPORT
#include "EventListener.h"
#include "EventNames.h"
#include "EventTargetNode.h"
#include "ExceptionCode.h"
#include "XPathEvaluator.h"
namespace WebCore {
using namespace XPath;
class InvalidatingEventListener : public EventListener {
public:
InvalidatingEventListener(XPathResult* result) : m_result(result) { }
virtual void handleEvent(Event*, bool) { m_result->invalidateIteratorState(); }
private:
XPathResult* m_result;
};
XPathResult::XPathResult(EventTargetNode* eventTarget, const Value& value)
: m_value(value)
, m_eventTarget(eventTarget)
{
m_eventListener = new InvalidatingEventListener(this);
m_eventTarget->addEventListener(EventNames::DOMSubtreeModifiedEvent, m_eventListener, false);
switch (m_value.type()) {
case Value::BooleanValue:
m_resultType = BOOLEAN_TYPE;
return;
case Value::NumberValue:
m_resultType = NUMBER_TYPE;
return;
case Value::StringValue:
m_resultType = STRING_TYPE;
return;
case Value::NodeVectorValue:
m_resultType = UNORDERED_NODE_ITERATOR_TYPE;
m_nodeSetPosition = 0;
m_nodeSet = m_value.toNodeVector();
m_invalidIteratorState = false;
return;
}
ASSERT_NOT_REACHED();
}
XPathResult::~XPathResult()
{
if (m_eventTarget)
m_eventTarget->removeEventListener(EventNames::DOMSubtreeModifiedEvent, m_eventListener.get(), false);
}
void XPathResult::convertTo(unsigned short type, ExceptionCode& ec)
{
switch (type) {
case ANY_TYPE:
break;
case NUMBER_TYPE:
m_resultType = type;
m_value = m_value.toNumber();
break;
case STRING_TYPE:
m_resultType = type;
m_value = m_value.toString();
break;
case BOOLEAN_TYPE:
m_resultType = type;
m_value = m_value.toBoolean();
break;
case UNORDERED_NODE_ITERATOR_TYPE:
case ORDERED_NODE_ITERATOR_TYPE:
case UNORDERED_NODE_SNAPSHOT_TYPE:
case ORDERED_NODE_SNAPSHOT_TYPE:
case ANY_UNORDERED_NODE_TYPE:
case FIRST_ORDERED_NODE_TYPE:
if (!m_value.isNodeVector()) {
ec = TYPE_ERR;
return;
}
m_resultType = type;
}
}
unsigned short XPathResult::resultType() const
{
return m_resultType;
}
double XPathResult::numberValue(ExceptionCode& ec) const
{
if (resultType() != NUMBER_TYPE) {
ec = TYPE_ERR;
return 0.0;
}
return m_value.toNumber();
}
String XPathResult::stringValue(ExceptionCode& ec) const
{
if (resultType() != STRING_TYPE) {
ec = TYPE_ERR;
return String();
}
return m_value.toString();
}
bool XPathResult::booleanValue(ExceptionCode& ec) const
{
if (resultType() != BOOLEAN_TYPE) {
ec = TYPE_ERR;
return false;
}
return m_value.toBoolean();
}
Node* XPathResult::singleNodeValue(ExceptionCode& ec) const
{
if (resultType() != ANY_UNORDERED_NODE_TYPE && resultType() != FIRST_ORDERED_NODE_TYPE) {
ec = TYPE_ERR;
return 0;
}
NodeVector nodes = m_value.toNodeVector();
if (nodes.size () == 0)
return 0;
return nodes[0].get();
}
void XPathResult::invalidateIteratorState()
{
m_invalidIteratorState = true;
ASSERT(m_eventTarget);
ASSERT(m_eventListener);
m_eventTarget->removeEventListener(EventNames::DOMSubtreeModifiedEvent, m_eventListener.get(), false);
m_eventTarget = 0;
}
bool XPathResult::invalidIteratorState() const
{
if (resultType() != UNORDERED_NODE_ITERATOR_TYPE && resultType() != ORDERED_NODE_ITERATOR_TYPE)
return false;
return m_invalidIteratorState;
}
unsigned long XPathResult::snapshotLength(ExceptionCode& ec) const
{
if (resultType() != UNORDERED_NODE_SNAPSHOT_TYPE && resultType() != ORDERED_NODE_SNAPSHOT_TYPE) {
ec = TYPE_ERR;
return 0;
}
return m_value.toNodeVector().size();
}
Node* XPathResult::iterateNext(ExceptionCode& ec)
{
if (resultType() != UNORDERED_NODE_ITERATOR_TYPE && resultType() != ORDERED_NODE_ITERATOR_TYPE) {
ec = TYPE_ERR;
return 0;
}
if (m_invalidIteratorState) {
ec = INVALID_STATE_ERR;
return 0;
}
if (m_nodeSetPosition + 1 > m_nodeSet.size())
return 0;
Node* node = m_nodeSet[m_nodeSetPosition].get();
m_nodeSetPosition++;
return node;
}
Node* XPathResult::snapshotItem(unsigned long index, ExceptionCode& ec)
{
if (resultType() != UNORDERED_NODE_SNAPSHOT_TYPE && resultType() != ORDERED_NODE_SNAPSHOT_TYPE) {
ec = TYPE_ERR;
return 0;
}
NodeVector nodes = m_value.toNodeVector();
if (index >= nodes.size())
return 0;
return nodes[index].get();
}
}
#endif // XPATH_SUPPORT