1/* 2 * Copyright 2005 Frerich Raabe <raabe@kde.org> 3 * Copyright (C) 2006 Apple Computer, Inc. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#ifndef XPathValue_h 28#define XPathValue_h 29 30#include "core/xml/XPathNodeSet.h" 31#include "wtf/text/WTFString.h" 32 33namespace blink { 34 35namespace XPath { 36 37struct EvaluationContext; 38 39class ValueData : public RefCountedWillBeGarbageCollectedFinalized<ValueData> { 40public: 41 static PassRefPtrWillBeRawPtr<ValueData> create() { return adoptRefWillBeNoop(new ValueData); } 42 static PassRefPtrWillBeRawPtr<ValueData> create(const NodeSet& nodeSet) { return adoptRefWillBeNoop(new ValueData(nodeSet)); } 43 static PassRefPtrWillBeRawPtr<ValueData> create(PassOwnPtrWillBeRawPtr<NodeSet> nodeSet) { return adoptRefWillBeNoop(new ValueData(nodeSet)); } 44 static PassRefPtrWillBeRawPtr<ValueData> create(const String& string) { return adoptRefWillBeNoop(new ValueData(string)); } 45 void trace(Visitor*); 46 NodeSet& nodeSet() { return *m_nodeSet; } 47 48 String m_string; 49 50private: 51 ValueData() : m_nodeSet(NodeSet::create()) { } 52 explicit ValueData(const NodeSet& nodeSet) : m_nodeSet(NodeSet::create(nodeSet)) { } 53 explicit ValueData(PassOwnPtrWillBeRawPtr<NodeSet> nodeSet) : m_nodeSet(nodeSet) { } 54 explicit ValueData(const String& string) : m_string(string), m_nodeSet(NodeSet::create()) { } 55 56 OwnPtrWillBeMember<NodeSet> m_nodeSet; 57}; 58 59// Copying Value objects makes their data partially shared, so care has to be taken when dealing with copies. 60class Value { 61 DISALLOW_ALLOCATION(); 62public: 63 enum Type { NodeSetValue, BooleanValue, NumberValue, StringValue }; 64 65 Value(unsigned value) : m_type(NumberValue), m_bool(false), m_number(value) { } 66 Value(unsigned long value) : m_type(NumberValue), m_bool(false), m_number(value) { } 67 Value(double value) : m_type(NumberValue), m_bool(false), m_number(value) { } 68 69 Value(const char* value) : m_type(StringValue), m_bool(false), m_number(0), m_data(ValueData::create(value)) { } 70 Value(const String& value) : m_type(StringValue), m_bool(false), m_number(0), m_data(ValueData::create(value)) { } 71 Value(const NodeSet& value) : m_type(NodeSetValue), m_bool(false), m_number(0), m_data(ValueData::create(value)) { } 72 Value(Node* value) : m_type(NodeSetValue), m_bool(false), m_number(0), m_data(ValueData::create()) { m_data->nodeSet().append(value); } 73 void trace(Visitor*); 74 75 // This is needed to safely implement constructing from bool - with normal 76 // function overloading, any pointer type would match. 77 template<typename T> Value(T); 78 79 static const struct AdoptTag { } adopt; 80 Value(PassOwnPtrWillBeRawPtr<NodeSet> value, const AdoptTag&) : m_type(NodeSetValue), m_bool(false), m_number(0), m_data(ValueData::create(value)) { } 81 82 Type type() const { return m_type; } 83 84 bool isNodeSet() const { return m_type == NodeSetValue; } 85 bool isBoolean() const { return m_type == BooleanValue; } 86 bool isNumber() const { return m_type == NumberValue; } 87 bool isString() const { return m_type == StringValue; } 88 89 // If this is called during XPathExpression::evaluate(), EvaluationContext 90 // should be passed. 91 const NodeSet& toNodeSet(EvaluationContext*) const; 92 NodeSet& modifiableNodeSet(EvaluationContext&); 93 bool toBoolean() const; 94 double toNumber() const; 95 String toString() const; 96 97private: 98 Type m_type; 99 bool m_bool; 100 double m_number; 101 RefPtrWillBeMember<ValueData> m_data; 102}; 103 104template<> 105inline Value::Value(bool value) 106 : m_type(BooleanValue) 107 , m_bool(value) 108 , m_number(0) 109{ 110} 111 112} 113 114} 115#endif // XPathValue_h 116