customDataType.hpp

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#ifndef _Wolframe_TYPES_CUSTOM_DATA_TYPE_HPP_INCLUDED
#define _Wolframe_TYPES_CUSTOM_DATA_TYPE_HPP_INCLUDED
#include "types/keymap.hpp"
#include <string>
#include <vector>
#include <cstring>
#include <boost/shared_ptr.hpp>

namespace _Wolframe {
namespace proc
{
        class ProcessorProvider;
}
namespace types {

class Variant;
class CustomDataType;
class CustomDataInitializer;
class DateTime;
class BigNumber;


class CustomDataValue
{
public:
        CustomDataValue()
                :m_type(0),m_initializer(0){}
        CustomDataValue( const CustomDataValue& o)
                :m_type(o.m_type),m_initializer(o.m_initializer){}
        virtual ~CustomDataValue(){};

        const CustomDataType* type() const                              {return m_type;}
        const CustomDataInitializer* initializer() const                {return m_initializer;}

        virtual int compare( const CustomDataValue& o) const=0;
        virtual std::string tostring() const=0;
        virtual void assign( const Variant& o)=0;
        virtual CustomDataValue* copy() const=0;
        virtual bool getBaseTypeValue( Variant&) const                  {return false;}

private:
        friend class CustomDataType;
        const CustomDataType* m_type;
        const CustomDataInitializer* m_initializer;
};

typedef boost::shared_ptr<CustomDataValue> CustomDataValueR;


class CustomDataInitializer
{
public:
        CustomDataInitializer(){}
        virtual ~CustomDataInitializer(){};
};

typedef boost::shared_ptr<CustomDataInitializer> CustomDataInitializerR;

class CustomDataType
{
public:
        typedef unsigned int ID;
        enum {NofUnaryOperators=3};
        enum UnaryOperatorType {Increment,Decrement,Negation};
        static const char* unaryOperatorTypeName( UnaryOperatorType i)
        {
                static const char* ar[] = {"increment","decrement","negation"};
                return ar[(int)i];
        }
        enum {NofBinaryOperators=6};
        enum BinaryOperatorType {Add,Subtract,Multiply,Divide,Power,Concat};
        static const char* binaryOperatorTypeName( BinaryOperatorType i)
        {
                static const char* ar[] = {"add","subtract","multiply","divide","power","concat"};
                return ar[(int)i];
        }
        enum {NofConversionOperators=5};
        enum ConversionOperatorType {ToString,ToInt,ToUInt,ToDouble,ToTimestamp};
        static const char* conversionOperatorTypeName( ConversionOperatorType i)
        {
                static const char* ar[] = {"tostring","toint","touint","todouble","totimestamp"};
                return ar[(int)i];
        }
        enum {NofDimensionOperators=1};
        enum DimensionOperatorType {Length};
        static const char* dimensionOperatorTypeName( DimensionOperatorType i)
        {
                static const char* ar[] = {"length"};
                return ar[(int)i];
        }

        typedef types::Variant (*ConversionOperator)( const CustomDataValue& operand);
        typedef types::Variant (*UnaryOperator)( const CustomDataValue& operand);
        typedef types::Variant (*BinaryOperator)( const CustomDataValue& operand, const Variant& arg);
        typedef std::size_t (*DimensionOperator)( const CustomDataValue& arg);
        typedef CustomDataInitializer* (*CreateCustomDataInitializer)( const std::vector<types::Variant>& arg);
        typedef CustomDataValue* (*CustomDataValueConstructor)( const CustomDataInitializer* initializer);
        typedef types::Variant (*CustomDataValueMethod)( const CustomDataValue& val, const std::vector<types::Variant>& arg);

public:
        CustomDataType()
                :m_id(0)
        {
                std::memset( &m_vmt, 0, sizeof( m_vmt));
        }

        CustomDataType( const std::string& name_,
                        CustomDataValueConstructor constructor_,
                        CreateCustomDataInitializer initializerconstructor_=0);

        CustomDataType( const CustomDataType& o);

        void define( UnaryOperatorType type, UnaryOperator op);
        void define( BinaryOperatorType type, BinaryOperator op);
        void define( ConversionOperatorType type, ConversionOperator op);
        void define( DimensionOperatorType type, DimensionOperator op);
        void define( const char* methodname, CustomDataValueMethod method);

        ConversionOperator getOperator( ConversionOperatorType type) const;
        UnaryOperator getOperator( UnaryOperatorType type) const;
        BinaryOperator getOperator( BinaryOperatorType type) const;
        DimensionOperator getOperator( DimensionOperatorType type) const;
        CustomDataValueMethod getMethod( const std::string& methodname) const;

        CustomDataInitializer* createInitializer( const std::vector<types::Variant>& arg) const;
        CustomDataValue* createValue( const CustomDataInitializer* i=0) const;

        bool hasInitializer() const             {return !!m_vmt.opInitializerConstructor;}
        const ID& id() const                    {return m_id;}
        const std::string& name() const         {return m_name;}

private:
        std::string m_name;
        friend class proc::ProcessorProvider;
        ID m_id;

        struct
        {
                UnaryOperator opUnary[ NofUnaryOperators];
                BinaryOperator opBinary[ NofBinaryOperators];
                DimensionOperator opDimension[ NofDimensionOperators];
                ConversionOperator opConversion[ NofConversionOperators];
                CreateCustomDataInitializer opInitializerConstructor;
                CustomDataValueConstructor opConstructor;
        }
        m_vmt;
        types::keymap<CustomDataValueMethod> m_methodmap;
};

typedef boost::shared_ptr<CustomDataType> CustomDataTypeR;


typedef CustomDataType* (*CreateCustomDataType)( const std::string& name);


}}//namespace
#endif