diff options
Diffstat (limited to 'src/3rdparty/webkit/WebCore/xml/XPathStep.cpp')
| -rw-r--r-- | src/3rdparty/webkit/WebCore/xml/XPathStep.cpp | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/src/3rdparty/webkit/WebCore/xml/XPathStep.cpp b/src/3rdparty/webkit/WebCore/xml/XPathStep.cpp new file mode 100644 index 0000000..abdcba5 --- /dev/null +++ b/src/3rdparty/webkit/WebCore/xml/XPathStep.cpp @@ -0,0 +1,306 @@ +/* + * 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) |