author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 17 Dec 2009 09:20:16 +0200 | |
changeset 36 | 0ed94ceaa377 |
parent 0 | dd21522fd290 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright 2005 Frerich Raabe <raabe@kde.org> |
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* Copyright (C) 2006 Apple Computer, Inc. |
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* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include "config.h" |
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#include "XPathPath.h" |
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#if ENABLE(XPATH) |
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#include "Document.h" |
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#include "XPathPredicate.h" |
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#include "XPathStep.h" |
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#include "XPathValue.h" |
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namespace WebCore { |
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namespace XPath { |
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Filter::Filter(Expression* expr, const Vector<Predicate*>& predicates) |
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: m_expr(expr), m_predicates(predicates) |
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{ |
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} |
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Filter::~Filter() |
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{ |
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delete m_expr; |
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deleteAllValues(m_predicates); |
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} |
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Value Filter::evaluate() const |
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{ |
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Value v = m_expr->evaluate(); |
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if (!v.isNodeSet()) |
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return v; |
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NodeSet& nodes = v.modifiableNodeSet(); |
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nodes.sort(); |
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EvaluationContext& evaluationContext = Expression::evaluationContext(); |
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for (unsigned i = 0; i < m_predicates.size(); i++) { |
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NodeSet newNodes; |
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evaluationContext.size = nodes.size(); |
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evaluationContext.position = 0; |
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for (unsigned j = 0; j < nodes.size(); j++) { |
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Node* node = nodes[j]; |
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evaluationContext.node = node; |
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++evaluationContext.position; |
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if (m_predicates[i]->evaluate()) |
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newNodes.append(node); |
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} |
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nodes.swap(newNodes); |
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} |
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return v; |
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} |
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LocationPath::LocationPath() |
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: m_absolute(false) |
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{ |
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} |
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LocationPath::~LocationPath() |
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{ |
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deleteAllValues(m_steps); |
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} |
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Value LocationPath::evaluate() const |
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{ |
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/* For absolute location paths, the context node is ignored - the |
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* document's root node is used instead. |
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*/ |
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Node* context = Expression::evaluationContext().node.get(); |
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if (m_absolute && context->nodeType() != Node::DOCUMENT_NODE) |
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context = context->ownerDocument(); |
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NodeSet nodes; |
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nodes.append(context); |
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evaluate(nodes); |
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return Value(nodes, Value::adopt); |
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} |
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void LocationPath::evaluate(NodeSet& nodes) const |
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{ |
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for (unsigned i = 0; i < m_steps.size(); i++) { |
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Step* step = m_steps[i]; |
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NodeSet newNodes; |
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HashSet<Node*> newNodesSet; |
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for (unsigned j = 0; j < nodes.size(); j++) { |
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NodeSet matches; |
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step->evaluate(nodes[j], matches); |
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for (size_t nodeIndex = 0; nodeIndex < matches.size(); ++nodeIndex) { |
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Node* node = matches[nodeIndex]; |
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if (newNodesSet.add(node).second) |
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newNodes.append(node); |
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} |
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} |
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126 |
|
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nodes.swap(newNodes); |
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} |
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129 |
|
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nodes.markSorted(false); |
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} |
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132 |
|
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void LocationPath::optimizeStepPair(unsigned index) |
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{ |
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Step* first = m_steps[index]; |
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136 |
|
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if (first->axis() == Step::DescendantOrSelfAxis |
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&& first->nodeTest().kind() == Step::NodeTest::AnyNodeTest |
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&& first->predicates().size() == 0) { |
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140 |
|
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Step* second = m_steps[index + 1]; |
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if (second->axis() == Step::ChildAxis |
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&& second->nodeTest().namespaceURI().isEmpty() |
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&& second->nodeTest().kind() == Step::NodeTest::NameTest |
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&& second->nodeTest().data() == "*") { |
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146 |
|
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// Optimize the common case of "//*" AKA descendant-or-self::node()/child::*. |
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first->setAxis(Step::DescendantAxis); |
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second->setAxis(Step::SelfAxis); |
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second->setNodeTest(Step::NodeTest::ElementNodeTest); |
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ASSERT(second->nodeTest().data().isEmpty()); |
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} |
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} |
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} |
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|
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void LocationPath::appendStep(Step* step) |
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157 |
{ |
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m_steps.append(step); |
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|
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unsigned stepCount = m_steps.size(); |
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if (stepCount > 1) |
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optimizeStepPair(stepCount - 2); |
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} |
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|
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void LocationPath::insertFirstStep(Step* step) |
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166 |
{ |
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m_steps.insert(0, step); |
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168 |
|
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if (m_steps.size() > 1) |
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optimizeStepPair(0); |
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171 |
} |
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|
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Path::Path(Filter* filter, LocationPath* path) |
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: m_filter(filter), |
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m_path(path) |
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176 |
{ |
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} |
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178 |
|
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Path::~Path() |
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{ |
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delete m_filter; |
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182 |
delete m_path; |
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183 |
} |
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184 |
|
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185 |
Value Path::evaluate() const |
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{ |
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Value v = m_filter->evaluate(); |
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188 |
|
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NodeSet& nodes = v.modifiableNodeSet(); |
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m_path->evaluate(nodes); |
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191 |
|
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192 |
return v; |
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193 |
} |
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194 |
|
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195 |
} |
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196 |
} |
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197 |
|
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198 |
#endif // ENABLE(XPATH) |