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 #if ENABLE(XPATH) 31 32 #include "PlatformString.h" 33 #include "XPathNodeSet.h" 34 35 namespace WebCore { 36 37 namespace XPath { 38 39 class ValueData : public RefCounted<ValueData> { 40 public: create()41 static PassRefPtr<ValueData> create() { return adoptRef(new ValueData); } create(const NodeSet & nodeSet)42 static PassRefPtr<ValueData> create(const NodeSet& nodeSet) { return adoptRef(new ValueData(nodeSet)); } create(const String & string)43 static PassRefPtr<ValueData> create(const String& string) { return adoptRef(new ValueData(string)); } 44 45 NodeSet m_nodeSet; 46 String m_string; 47 48 private: ValueData()49 ValueData() { } ValueData(const NodeSet & nodeSet)50 ValueData(const NodeSet& nodeSet) : m_nodeSet(nodeSet) { } ValueData(const String & string)51 ValueData(const String& string) : m_string(string) { } 52 }; 53 54 // Copying Value objects makes their data partially shared, so care has to be taken when dealing with copies. 55 class Value { 56 public: 57 enum Type { NodeSetValue, BooleanValue, NumberValue, StringValue }; 58 Value(unsigned value)59 Value(unsigned value) : m_type(NumberValue), m_bool(false), m_number(value) {} Value(unsigned long value)60 Value(unsigned long value) : m_type(NumberValue), m_bool(false), m_number(value) {} Value(double value)61 Value(double value) : m_type(NumberValue), m_bool(false), m_number(value) {} 62 Value(const char * value)63 Value(const char* value) : m_type(StringValue), m_bool(false), m_number(0), m_data(ValueData::create(value)) {} Value(const String & value)64 Value(const String& value) : m_type(StringValue), m_bool(false), m_number(0), m_data(ValueData::create(value)) {} Value(const NodeSet & value)65 Value(const NodeSet& value) : m_type(NodeSetValue), m_bool(false), m_number(0), m_data(ValueData::create(value)) {} Value(Node * value)66 Value(Node* value) : m_type(NodeSetValue), m_bool(false), m_number(0), m_data(ValueData::create()) { m_data->m_nodeSet.append(value); } 67 68 // This is needed to safely implement constructing from bool - with normal function overloading, any pointer type would match. 69 template<typename T> Value(T); 70 71 static const struct AdoptTag {} adopt; Value(NodeSet & value,const AdoptTag &)72 Value(NodeSet& value, const AdoptTag&) : m_type(NodeSetValue), m_bool(false), m_number(0), m_data(ValueData::create()) { value.swap(m_data->m_nodeSet); } 73 type()74 Type type() const { return m_type; } 75 isNodeSet()76 bool isNodeSet() const { return m_type == NodeSetValue; } isBoolean()77 bool isBoolean() const { return m_type == BooleanValue; } isNumber()78 bool isNumber() const { return m_type == NumberValue; } isString()79 bool isString() const { return m_type == StringValue; } 80 81 const NodeSet& toNodeSet() const; 82 NodeSet& modifiableNodeSet(); 83 bool toBoolean() const; 84 double toNumber() const; 85 String toString() const; 86 87 private: 88 Type m_type; 89 bool m_bool; 90 double m_number; 91 RefPtr<ValueData> m_data; 92 }; 93 94 template<> Value(bool value)95 inline Value::Value(bool value) 96 : m_type(BooleanValue) 97 , m_bool(value) 98 , m_number(0) 99 { 100 } 101 } 102 } 103 104 #endif // ENABLE(XPATH) 105 106 #endif // XPath_Value_H 107