/*
* Copyright 2005 Frerich Raabe <raabe@kde.org>
* Copyright (C) 2006 Apple Computer, Inc.
* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
*
* 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 "XPathStep.h"
#if ENABLE(XPATH)
#include "Document.h"
#include "Element.h"
#include "NamedAttrMap.h"
#include "XPathNSResolver.h"
#include "XPathParser.h"
#include "XPathUtil.h"
namespace WebCore {
namespace XPath {
Step::Step(Axis axis, const NodeTest& nodeTest, const Vector<Predicate*>& predicates)
: m_axis(axis)
, m_nodeTest(nodeTest)
, m_predicates(predicates)
{
}
Step::~Step()
{
deleteAllValues(m_predicates);
}
void Step::evaluate(Node* context, NodeSet& nodes) const
{
nodesInAxis(context, nodes);
EvaluationContext& evaluationContext = Expression::evaluationContext();
for (unsigned i = 0; i < m_predicates.size(); i++) {
Predicate* predicate = m_predicates[i];
NodeSet newNodes;
if (!nodes.isSorted())
newNodes.markSorted(false);
for (unsigned j = 0; j < nodes.size(); j++) {
Node* node = nodes[j];
Expression::evaluationContext().node = node;
evaluationContext.size = nodes.size();
evaluationContext.position = j + 1;
if (predicate->evaluate())
newNodes.append(node);
}
nodes.swap(newNodes);
}
}
void Step::nodesInAxis(Node* context, NodeSet& nodes) const
{
ASSERT(nodes.isEmpty());
switch (m_axis) {
case ChildAxis:
if (context->isAttributeNode()) // In XPath model, attribute nodes do not have children.
return;
for (Node* n = context->firstChild(); n; n = n->nextSibling())
if (nodeMatches(n))
nodes.append(n);
return;
case DescendantAxis:
if (context->isAttributeNode()) // In XPath model, attribute nodes do not have children.
return;
for (Node* n = context->firstChild(); n; n = n->traverseNextNode(context))
if (nodeMatches(n))
nodes.append(n);
return;
case ParentAxis:
if (context->isAttributeNode()) {
Node* n = static_cast<Attr*>(context)->ownerElement();
if (nodeMatches(n))
nodes.append(n);
} else {
Node* n = context->parentNode();
if (n && nodeMatches(n))
nodes.append(n);
}
return;
case AncestorAxis: {
Node* n = context;
if (context->isAttributeNode()) {
n = static_cast<Attr*>(context)->ownerElement();
if (nodeMatches(n))
nodes.append(n);
}
for (n = n->parentNode(); n; n = n->parentNode())
if (nodeMatches(n))
nodes.append(n);
nodes.markSorted(false);
return;
}
case FollowingSiblingAxis:
if (context->nodeType() == Node::ATTRIBUTE_NODE ||
context->nodeType() == Node::XPATH_NAMESPACE_NODE)
return;
for (Node* n = context->nextSibling(); n; n = n->nextSibling())
if (nodeMatches(n))
nodes.append(n);
return;
case PrecedingSiblingAxis:
if (context->nodeType() == Node::ATTRIBUTE_NODE ||
context->nodeType() == Node::XPATH_NAMESPACE_NODE)
return;
for (Node* n = context->previousSibling(); n; n = n->previousSibling())
if (nodeMatches(n))
nodes.append(n);
nodes.markSorted(false);
return;
case FollowingAxis:
if (context->isAttributeNode()) {
Node* p = static_cast<Attr*>(context)->ownerElement();
while ((p = p->traverseNextNode()))
if (nodeMatches(p))
nodes.append(p);
} else {
for (Node* p = context; !isRootDomNode(p); p = p->parentNode()) {
for (Node* n = p->nextSibling(); n; n = n->nextSibling()) {
if (nodeMatches(n))
nodes.append(n);
for (Node* c = n->firstChild(); c; c = c->traverseNextNode(n))
if (nodeMatches(c))
nodes.append(c);
}
}
}
return;
case PrecedingAxis: {
if (context->isAttributeNode())
context = static_cast<Attr*>(context)->ownerElement();
Node* n = context;
while (Node* parent = n->parent()) {
for (n = n->traversePreviousNode(); n != parent; n = n->traversePreviousNode())
if (nodeMatches(n))
nodes.append(n);
n = parent;
}
nodes.markSorted(false);
return;
}
case AttributeAxis: {
if (context->nodeType() != Node::ELEMENT_NODE)
return;
// Avoid lazily creating attribute nodes for attributes that we do not need anyway.
if (m_nodeTest.kind() == NodeTest::NameTest && m_nodeTest.data() != "*") {
RefPtr<Node> n = static_cast<Element*>(context)->getAttributeNodeNS(m_nodeTest.namespaceURI(), m_nodeTest.data());
if (n && n->namespaceURI() != "http://www.w3.org/2000/xmlns/") // In XPath land, namespace nodes are not accessible on the attribute axis.
nodes.append(n.release());
return;
}
NamedAttrMap* attrs = context->attributes();
if (!attrs)
return;
for (unsigned long i = 0; i < attrs->length(); ++i) {
RefPtr<Node> n = attrs->item(i);
if (nodeMatches(n.get()))
nodes.append(n.release());
}
return;
}
case NamespaceAxis:
// XPath namespace nodes are not implemented yet.
return;
case SelfAxis:
if (nodeMatches(context))
nodes.append(context);
return;
case DescendantOrSelfAxis:
if (nodeMatches(context))
nodes.append(context);
if (context->isAttributeNode()) // In XPath model, attribute nodes do not have children.
return;
for (Node* n = context->firstChild(); n; n = n->traverseNextNode(context))
if (nodeMatches(n))
nodes.append(n);
return;
case AncestorOrSelfAxis: {
if (nodeMatches(context))
nodes.append(context);
Node* n = context;
if (context->isAttributeNode()) {
n = static_cast<Attr*>(context)->ownerElement();
if (nodeMatches(n))
nodes.append(n);
}
for (n = n->parentNode(); n; n = n->parentNode())
if (nodeMatches(n))
nodes.append(n);
nodes.markSorted(false);
return;
}
}
ASSERT_NOT_REACHED();
}
bool Step::nodeMatches(Node* node) const
{
switch (m_nodeTest.kind()) {
case NodeTest::TextNodeTest:
return node->nodeType() == Node::TEXT_NODE || node->nodeType() == Node::CDATA_SECTION_NODE;
case NodeTest::CommentNodeTest:
return node->nodeType() == Node::COMMENT_NODE;
case NodeTest::ProcessingInstructionNodeTest: {
const String& name = m_nodeTest.data();
return node->nodeType() == Node::PROCESSING_INSTRUCTION_NODE && (name.isEmpty() || node->nodeName() == name);
}
case NodeTest::ElementNodeTest:
return node->isElementNode();
case NodeTest::AnyNodeTest:
return true;
case NodeTest::NameTest: {
const String& name = m_nodeTest.data();
const String& namespaceURI = m_nodeTest.namespaceURI();
if (m_axis == AttributeAxis) {
ASSERT(node->isAttributeNode());
// In XPath land, namespace nodes are not accessible on the attribute axis.
if (node->namespaceURI() == "http://www.w3.org/2000/xmlns/")
return false;
if (name == "*")
return namespaceURI.isEmpty() || node->namespaceURI() == namespaceURI;
return node->localName() == name && node->namespaceURI() == namespaceURI;
}
if (m_axis == NamespaceAxis) {
// Node test on the namespace axis is not implemented yet
return false;
}
if (name == "*")
return node->nodeType() == primaryNodeType(m_axis) && (namespaceURI.isEmpty() || namespaceURI == node->namespaceURI());
// We use tagQName here because we don't want the element name in uppercase
// like we get with HTML elements.
// Paths without namespaces should match HTML elements in HTML documents despite those having an XHTML namespace.
return node->nodeType() == Node::ELEMENT_NODE
&& static_cast<Element*>(node)->tagQName().localName() == name
&& ((node->isHTMLElement() && node->document()->isHTMLDocument() && namespaceURI.isNull()) || namespaceURI == node->namespaceURI());
}
}
ASSERT_NOT_REACHED();
return false;
}
Node::NodeType Step::primaryNodeType(Axis axis) const
{
switch (axis) {
case AttributeAxis:
return Node::ATTRIBUTE_NODE;
case NamespaceAxis:
return Node::XPATH_NAMESPACE_NODE;
default:
return Node::ELEMENT_NODE;
}
}
}
}
#endif // ENABLE(XPATH)