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#ifndef JSON_SPIRIT_VALUE
#define JSON_SPIRIT_VALUE

//          Copyright John W. Wilkinson 2007 - 2011
// Distributed under the MIT License, see accompanying file LICENSE.txt

// json spirit version 4.04

#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif

#include <vector>
#include <map>
#include <string>
#include <cassert>
#include <sstream>
#include <stdexcept>
#include <boost/config.hpp> 
#include <boost/cstdint.hpp> 
#include <boost/shared_ptr.hpp> 
#include <boost/variant.hpp> 

namespace json_spirit
{
    enum Value_type{ obj_type, array_type, str_type, bool_type, int_type, real_type, null_type };

    struct Null{};

    template< class Config >    // Config determines whether the value uses std::string or std::wstring and
                                // whether JSON Objects are represented as vectors or maps
    class Value_impl
    {
    public:

        typedef Config Config_type;
        typedef typename Config::String_type String_type;
        typedef typename Config::Object_type Object;
        typedef typename Config::Array_type Array;
        typedef typename String_type::const_pointer Const_str_ptr;  // eg const char*

        Value_impl();  // creates null value
        Value_impl( Const_str_ptr      value ); 
        Value_impl( const String_type& value );
        Value_impl( const Object&      value );
        Value_impl( const Array&       value );
        Value_impl( bool               value );
        Value_impl( int                value );
        Value_impl( boost::int64_t     value );
        Value_impl( boost::uint64_t    value );
        Value_impl( double             value );

        Value_impl( const Value_impl& other );

        bool operator==( const Value_impl& lhs ) const;

        Value_impl& operator=( const Value_impl& lhs );

        Value_type type() const;

        bool is_uint64() const;
        bool is_null() const;

        const String_type& get_str()    const;
        const Object&      get_obj()    const;
        const Array&       get_array()  const;
        bool               get_bool()   const;
        int                get_int()    const;
        boost::int64_t     get_int64()  const;
        boost::uint64_t    get_uint64() const;
        double             get_real()   const;

        Object& get_obj();
        Array&  get_array();

        template< typename T > T get_value() const;  // example usage: int    i = value.get_value< int >();
                                                     // or             double d = value.get_value< double >();

        static const Value_impl null;

    private:

        void check_type( const Value_type vtype ) const;

        typedef boost::variant< boost::recursive_wrapper< Object >, boost::recursive_wrapper< Array >, 
                                String_type, bool, boost::int64_t, double, Null, boost::uint64_t > Variant;

        Variant v_;
    };

    // vector objects

    template< class Config >
    struct Pair_impl
    {
        typedef typename Config::String_type String_type;
        typedef typename Config::Value_type Value_type;

        Pair_impl()
        {
        }

        Pair_impl( const String_type& name, const Value_type& value );

        bool operator==( const Pair_impl& lhs ) const;

        String_type name_;
        Value_type value_;
    };

    template< class String >
    struct Config_vector
    {
        typedef String String_type;
        typedef Value_impl< Config_vector > Value_type;
        typedef Pair_impl < Config_vector > Pair_type;
        typedef std::vector< Value_type > Array_type;
        typedef std::vector< Pair_type > Object_type;

        static Value_type& add( Object_type& obj, const String_type& name, const Value_type& value )
        {
            obj.push_back( Pair_type( name , value ) );

            return obj.back().value_;
        }
                
        static String_type get_name( const Pair_type& pair )
        {
            return pair.name_;
        }
                
        static Value_type get_value( const Pair_type& pair )
        {
            return pair.value_;
        }
    };

    // typedefs for ASCII

    typedef Config_vector< std::string > Config;

    typedef Config::Value_type  Value;
    typedef Config::Pair_type   Pair;
    typedef Config::Object_type Object;
    typedef Config::Array_type  Array;

    // typedefs for Unicode

#ifndef BOOST_NO_STD_WSTRING

    typedef Config_vector< std::wstring > wConfig;

    typedef wConfig::Value_type  wValue;
    typedef wConfig::Pair_type   wPair;
    typedef wConfig::Object_type wObject;
    typedef wConfig::Array_type  wArray;
#endif

    // map objects

    template< class String >
    struct Config_map
    {
        typedef String String_type;
        typedef Value_impl< Config_map > Value_type;
        typedef std::vector< Value_type > Array_type;
        typedef std::map< String_type, Value_type > Object_type;
        typedef std::pair< String_type, Value_type > Pair_type;

        static Value_type& add( Object_type& obj, const String_type& name, const Value_type& value )
        {
            return obj[ name ] = value;
        }
                
        static String_type get_name( const Pair_type& pair )
        {
            return pair.first;
        }
                
        static Value_type get_value( const Pair_type& pair )
        {
            return pair.second;
        }
    };

    // typedefs for ASCII

    typedef Config_map< std::string > mConfig;

    typedef mConfig::Value_type  mValue;
    typedef mConfig::Object_type mObject;
    typedef mConfig::Array_type  mArray;

    // typedefs for Unicode

#ifndef BOOST_NO_STD_WSTRING

    typedef Config_map< std::wstring > wmConfig;

    typedef wmConfig::Value_type  wmValue;
    typedef wmConfig::Object_type wmObject;
    typedef wmConfig::Array_type  wmArray;

#endif

    ///////////////////////////////////////////////////////////////////////////////////////////////
    //
    // implementation

    inline bool operator==( const Null&, const Null& )
    {
        return true;
    }

    template< class Config >
    const Value_impl< Config > Value_impl< Config >::null;

    template< class Config >
    Value_impl< Config >::Value_impl()
    :   v_( Null() )
    {
    }

    template< class Config >
    Value_impl< Config >::Value_impl( const Const_str_ptr value )
    :  v_( String_type( value ) )
    {
    }

    template< class Config >
    Value_impl< Config >::Value_impl( const String_type& value )
    :   v_( value )
    {
    }

    template< class Config >
    Value_impl< Config >::Value_impl( const Object& value )
    :   v_( value )
    {
    }

    template< class Config >
    Value_impl< Config >::Value_impl( const Array& value )
    :   v_( value )
    {
    }

    template< class Config >
    Value_impl< Config >::Value_impl( bool value )
    :   v_( value )
    {
    }

    template< class Config >
    Value_impl< Config >::Value_impl( int value )
    :   v_( static_cast< boost::int64_t >( value ) )
    {
    }

    template< class Config >
    Value_impl< Config >::Value_impl( boost::int64_t value )
    :   v_( value )
    {
    }

    template< class Config >
    Value_impl< Config >::Value_impl( boost::uint64_t value )
    :   v_( value )
    {
    }

    template< class Config >
    Value_impl< Config >::Value_impl( double value )
    :   v_( value )
    {
    }

    template< class Config >
    Value_impl< Config >::Value_impl( const Value_impl< Config >& other )
    :   v_( other.v_ )
    {
    }

    template< class Config >
    Value_impl< Config >& Value_impl< Config >::operator=( const Value_impl& lhs )
    {
        Value_impl tmp( lhs );

        std::swap( v_, tmp.v_ );

        return *this;
    }

    template< class Config >
    bool Value_impl< Config >::operator==( const Value_impl& lhs ) const
    {
        if( this == &lhs ) return true;

        if( type() != lhs.type() ) return false;

        return v_ == lhs.v_; 
    }

    template< class Config >
    Value_type Value_impl< Config >::type() const
    {
        if( is_uint64() )
        {
            return int_type;
        }

        return static_cast< Value_type >( v_.which() );
    }

    template< class Config >
    bool Value_impl< Config >::is_uint64() const
    {
        return v_.which() == null_type + 1;
    }

    template< class Config >
    bool Value_impl< Config >::is_null() const
    {
        return type() == null_type;
    }

    template< class Config >
    void Value_impl< Config >::check_type( const Value_type vtype ) const
    {
        if( type() != vtype ) 
        {
            std::ostringstream os;

            os << "value type is " << type() << " not " << vtype;

            throw std::runtime_error( os.str() );
        }
    }

    template< class Config >
    const typename Config::String_type& Value_impl< Config >::get_str() const
    {
        check_type( str_type );

        return *boost::get< String_type >( &v_ );
    }

    template< class Config >
    const typename Value_impl< Config >::Object& Value_impl< Config >::get_obj() const
    {
        check_type( obj_type );

        return *boost::get< Object >( &v_ );
    }
     
    template< class Config >
    const typename Value_impl< Config >::Array& Value_impl< Config >::get_array() const
    {
        check_type( array_type );

        return *boost::get< Array >( &v_ );
    }
     
    template< class Config >
    bool Value_impl< Config >::get_bool() const
    {
        check_type( bool_type );

        return boost::get< bool >( v_ );
    }
     
    template< class Config >
    int Value_impl< Config >::get_int() const
    {
        check_type( int_type );

        return static_cast< int >( get_int64() );
    }
    
    template< class Config >
    boost::int64_t Value_impl< Config >::get_int64() const
    {
        check_type( int_type );

        if( is_uint64() )
        {
            return static_cast< boost::int64_t >( get_uint64() );
        }

        return boost::get< boost::int64_t >( v_ );
    }
    
    template< class Config >
    boost::uint64_t Value_impl< Config >::get_uint64() const
    {
        check_type( int_type );

        if( !is_uint64() )
        {
            return static_cast< boost::uint64_t >( get_int64() );
        }

        return boost::get< boost::uint64_t >( v_ );
    }

    template< class Config >
    double Value_impl< Config >::get_real() const
    {
        if( type() == int_type )
        {
            return is_uint64() ? static_cast< double >( get_uint64() )
                               : static_cast< double >( get_int64() );
        }

        check_type( real_type );

        return boost::get< double >( v_ );
    }

    template< class Config >
    typename Value_impl< Config >::Object& Value_impl< Config >::get_obj()
    {
        check_type( obj_type );

        return *boost::get< Object >( &v_ );
    }

    template< class Config >
    typename Value_impl< Config >::Array& Value_impl< Config >::get_array()
    {
        check_type( array_type );

        return *boost::get< Array >( &v_ );
    }

    template< class Config >
    Pair_impl< Config >::Pair_impl( const String_type& name, const Value_type& value )
    :   name_( name )
    ,   value_( value )
    {
    }

    template< class Config >
    bool Pair_impl< Config >::operator==( const Pair_impl< Config >& lhs ) const
    {
        if( this == &lhs ) return true;

        return ( name_ == lhs.name_ ) && ( value_ == lhs.value_ );
    }

    // converts a C string, ie. 8 bit char array, to a string object
    //
    template < class String_type >
    String_type to_str( const char* c_str )
    {
        String_type result;

        for( const char* p = c_str; *p != 0; ++p )
        {
            result += *p;
        }

        return result;
    }

    //

    namespace internal_
    {
        template< typename T >
        struct Type_to_type
        {
        };

        template< class Value > 
        int get_value( const Value& value, Type_to_type< int > )
        {
            return value.get_int();
        }
       
        template< class Value > 
        boost::int64_t get_value( const Value& value, Type_to_type< boost::int64_t > )
        {
            return value.get_int64();
        }
       
        template< class Value > 
        boost::uint64_t get_value( const Value& value, Type_to_type< boost::uint64_t > )
        {
            return value.get_uint64();
        }
       
        template< class Value > 
        double get_value( const Value& value, Type_to_type< double > )
        {
            return value.get_real();
        }
       
        template< class Value > 
        typename Value::String_type get_value( const Value& value, Type_to_type< typename Value::String_type > )
        {
            return value.get_str();
        }
       
        template< class Value > 
        typename Value::Array get_value( const Value& value, Type_to_type< typename Value::Array > )
        {
            return value.get_array();
        }
       
        template< class Value > 
        typename Value::Object get_value( const Value& value, Type_to_type< typename Value::Object > )
        {
            return value.get_obj();
        }
       
        template< class Value > 
        bool get_value( const Value& value, Type_to_type< bool > )
        {
            return value.get_bool();
        }
    }

    template< class Config >
    template< typename T > 
    T Value_impl< Config >::get_value() const
    {
        return internal_::get_value( *this, internal_::Type_to_type< T >() );
    }
}

#endif