88 lines
3.2 KiB
C++
88 lines
3.2 KiB
C++
/*
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* Copyright (C) 2005 Frerich Raabe <raabe@kde.org>
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* Copyright (C) 2006, 2009, 2013 Apple Inc. All rights reserved.
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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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#pragma once
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#include "XPathValue.h"
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namespace WebCore {
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namespace XPath {
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struct EvaluationContext {
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RefPtr<Node> node;
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unsigned size;
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unsigned position;
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HashMap<String, String> variableBindings;
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bool hadTypeConversionError;
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};
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class Expression {
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WTF_MAKE_NONCOPYABLE(Expression); WTF_MAKE_FAST_ALLOCATED;
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public:
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static EvaluationContext& evaluationContext();
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virtual ~Expression() = default;
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virtual Value evaluate() const = 0;
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virtual Value::Type resultType() const = 0;
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bool isContextNodeSensitive() const { return m_isContextNodeSensitive; }
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bool isContextPositionSensitive() const { return m_isContextPositionSensitive; }
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bool isContextSizeSensitive() const { return m_isContextSizeSensitive; }
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protected:
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Expression();
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unsigned subexpressionCount() const { return m_subexpressions.size(); }
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const Expression& subexpression(unsigned i) const { return *m_subexpressions[i]; }
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void addSubexpression(std::unique_ptr<Expression> expression)
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{
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m_isContextNodeSensitive |= expression->m_isContextNodeSensitive;
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m_isContextPositionSensitive |= expression->m_isContextPositionSensitive;
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m_isContextSizeSensitive |= expression->m_isContextSizeSensitive;
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m_subexpressions.append(WTFMove(expression));
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}
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void setSubexpressions(Vector<std::unique_ptr<Expression>>);
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void setIsContextNodeSensitive(bool value) { m_isContextNodeSensitive = value; }
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void setIsContextPositionSensitive(bool value) { m_isContextPositionSensitive = value; }
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void setIsContextSizeSensitive(bool value) { m_isContextSizeSensitive = value; }
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private:
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Vector<std::unique_ptr<Expression>> m_subexpressions;
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// Evaluation details that can be used for optimization.
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bool m_isContextNodeSensitive;
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bool m_isContextPositionSensitive;
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bool m_isContextSizeSensitive;
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};
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} // namespace XPath
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} // namespace WebCore
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