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