blob: 5acf70bbbd82836174bd5c49b02522056bbf9e3f [file] [log] [blame]
/*
* Copyright 2005 Frerich Raabe <raabe@kde.org>
* Copyright (C) 2006 Apple Computer, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "XPathResult.h"
#if ENABLE(XPATH)
#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::NodeSetValue:
m_resultType = UNORDERED_NODE_ITERATOR_TYPE;
m_nodeSetPosition = 0;
m_nodeSet = m_value.toNodeSet();
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 UNORDERED_NODE_SNAPSHOT_TYPE:
case ANY_UNORDERED_NODE_TYPE:
case FIRST_ORDERED_NODE_TYPE: // This is correct - singleNodeValue() will take care of ordering.
if (!m_value.isNodeSet()) {
ec = TYPE_ERR;
return;
}
m_resultType = type;
break;
case ORDERED_NODE_ITERATOR_TYPE:
if (!m_value.isNodeSet()) {
ec = TYPE_ERR;
return;
}
m_nodeSet.sort();
m_resultType = type;
break;
case ORDERED_NODE_SNAPSHOT_TYPE:
if (!m_value.isNodeSet()) {
ec = TYPE_ERR;
return;
}
m_value.toNodeSet().sort();
m_resultType = type;
break;
}
}
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;
}
const NodeSet& nodes = m_value.toNodeSet();
if (resultType() == FIRST_ORDERED_NODE_TYPE)
return nodes.firstNode();
else
return nodes.anyNode();
}
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.toNodeSet().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];
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;
}
const NodeSet& nodes = m_value.toNodeSet();
if (index >= nodes.size())
return 0;
return nodes[index];
}
}
#endif // ENABLE(XPATH)