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      1 /*
      2  * Copyright 2005 Frerich Raabe <raabe (at) 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 
     33 namespace WebCore {
     34 
     35     namespace XPath {
     36 
     37         class ValueData : public RefCounted<ValueData> {
     38         public:
     39             static PassRefPtr<ValueData> create() { return adoptRef(new ValueData); }
     40             static PassRefPtr<ValueData> create(const NodeSet& nodeSet) { return adoptRef(new ValueData(nodeSet)); }
     41             static PassRefPtr<ValueData> create(const String& string) { return adoptRef(new ValueData(string)); }
     42 
     43             NodeSet m_nodeSet;
     44             String m_string;
     45 
     46         private:
     47             ValueData() { }
     48             explicit ValueData(const NodeSet& nodeSet) : m_nodeSet(nodeSet) { }
     49             explicit ValueData(const String& string) : m_string(string) { }
     50         };
     51 
     52         // Copying Value objects makes their data partially shared, so care has to be taken when dealing with copies.
     53         class Value {
     54         public:
     55             enum Type { NodeSetValue, BooleanValue, NumberValue, StringValue };
     56 
     57             Value(unsigned value) : m_type(NumberValue), m_bool(false), m_number(value) {}
     58             Value(unsigned long value) : m_type(NumberValue), m_bool(false), m_number(value) {}
     59             Value(double value) : m_type(NumberValue), m_bool(false), m_number(value) {}
     60 
     61             Value(const char* value) : m_type(StringValue), m_bool(false), m_number(0), m_data(ValueData::create(value)) {}
     62             Value(const String& value) : m_type(StringValue), m_bool(false), m_number(0), m_data(ValueData::create(value)) {}
     63             Value(const NodeSet& value) : m_type(NodeSetValue), m_bool(false), m_number(0), m_data(ValueData::create(value)) {}
     64             Value(Node* value) : m_type(NodeSetValue), m_bool(false), m_number(0), m_data(ValueData::create()) { m_data->m_nodeSet.append(value); }
     65 
     66             // This is needed to safely implement constructing from bool - with normal function overloading, any pointer type would match.
     67             template<typename T> Value(T);
     68 
     69             static const struct AdoptTag {} adopt;
     70             Value(NodeSet& value, const AdoptTag&) : m_type(NodeSetValue), m_bool(false), m_number(0),  m_data(ValueData::create()) { value.swap(m_data->m_nodeSet); }
     71 
     72             Type type() const { return m_type; }
     73 
     74             bool isNodeSet() const { return m_type == NodeSetValue; }
     75             bool isBoolean() const { return m_type == BooleanValue; }
     76             bool isNumber() const { return m_type == NumberValue; }
     77             bool isString() const { return m_type == StringValue; }
     78 
     79             const NodeSet& toNodeSet() const;
     80             NodeSet& modifiableNodeSet();
     81             bool toBoolean() const;
     82             double toNumber() const;
     83             String toString() const;
     84 
     85         private:
     86             Type m_type;
     87             bool m_bool;
     88             double m_number;
     89             RefPtr<ValueData> m_data;
     90         };
     91 
     92         template<>
     93         inline Value::Value(bool value)
     94             : m_type(BooleanValue)
     95             , m_bool(value)
     96             , m_number(0)
     97         {
     98         }
     99     }
    100 }
    101 
    102 #endif // XPath_Value_H
    103