| /* |
| * 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) |
