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/*
* Copyright 2005 Frerich Raabe <raabe@kde.org>
* Copyright (C) 2006 Apple Computer, Inc.
*
* 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 XPathValue_h
#define XPathValue_h
#include "core/xml/XPathNodeSet.h"
#include "wtf/text/WTFString.h"
namespace blink {
namespace XPath {
struct EvaluationContext;
class ValueData : public GarbageCollectedFinalized<ValueData> {
public:
static ValueData* create() { return new ValueData; }
static ValueData* create(const NodeSet& nodeSet) { return new ValueData(nodeSet); }
static ValueData* create(NodeSet* nodeSet) { return new ValueData(nodeSet); }
static ValueData* create(const String& string) { return new ValueData(string); }
DECLARE_TRACE();
NodeSet& nodeSet() { return *m_nodeSet; }
String m_string;
private:
ValueData() : m_nodeSet(NodeSet::create()) { }
explicit ValueData(const NodeSet& nodeSet) : m_nodeSet(NodeSet::create(nodeSet)) { }
explicit ValueData(NodeSet* nodeSet) : m_nodeSet(nodeSet) { }
explicit ValueData(const String& string) : m_string(string), m_nodeSet(NodeSet::create()) { }
Member<NodeSet> m_nodeSet;
};
// Copying Value objects makes their data partially shared, so care has to be taken when dealing with copies.
class Value {
DISALLOW_ALLOCATION();
public:
enum Type { NodeSetValue, BooleanValue, NumberValue, StringValue };
Value(unsigned value) : m_type(NumberValue), m_bool(false), m_number(value) { }
Value(unsigned long value) : m_type(NumberValue), m_bool(false), m_number(value) { }
Value(double value) : m_type(NumberValue), m_bool(false), m_number(value) { }
Value(const char* value) : m_type(StringValue), m_bool(false), m_number(0), m_data(ValueData::create(value)) { }
Value(const String& value) : m_type(StringValue), m_bool(false), m_number(0), m_data(ValueData::create(value)) { }
Value(const NodeSet& value) : m_type(NodeSetValue), m_bool(false), m_number(0), m_data(ValueData::create(value)) { }
Value(Node* value) : m_type(NodeSetValue), m_bool(false), m_number(0), m_data(ValueData::create()) { m_data->nodeSet().append(value); }
DECLARE_TRACE();
// This is needed to safely implement constructing from bool - with normal
// function overloading, any pointer type would match.
template<typename T> Value(T);
static const struct AdoptTag { } adopt;
Value(NodeSet* value, const AdoptTag&) : m_type(NodeSetValue), m_bool(false), m_number(0), m_data(ValueData::create(value)) { }
Type type() const { return m_type; }
bool isNodeSet() const { return m_type == NodeSetValue; }
bool isBoolean() const { return m_type == BooleanValue; }
bool isNumber() const { return m_type == NumberValue; }
bool isString() const { return m_type == StringValue; }
// If this is called during XPathExpression::evaluate(), EvaluationContext
// should be passed.
const NodeSet& toNodeSet(EvaluationContext*) const;
NodeSet& modifiableNodeSet(EvaluationContext&);
bool toBoolean() const;
double toNumber() const;
String toString() const;
private:
Type m_type;
bool m_bool;
double m_number;
Member<ValueData> m_data;
};
template<>
inline Value::Value(bool value)
: m_type(BooleanValue)
, m_bool(value)
, m_number(0)
{
}
} // namespace XPath
} // namespace blink
#endif // XPathValue_h