types.h

/* Copyright (c) 2024 Julian Benda
 *
 * This file is part of inkCPP which is released under MIT license.
 * See file LICENSE.txt or go to
 * https://github.com/JBenda/inkcpp for full license details.
 */
#pragma once
 
#include "list.h"
#include "story_ptr.h"
#include "system.h"
 
namespace ink::runtime
{
class globals_interface;
class runner_interface;
class snapshot;

using globals = story_ptr<globals_interface>;
using runner  = story_ptr<runner_interface>;
using list    = list_interface*;

struct value {
private:
    union {
        bool        v_bool;
        uint32_t    v_uint32;
        int32_t     v_int32;
        const char* v_string;
        float       v_float;
        list        v_list;
    };
 
public:
    enum class Type {
        Bool,   
        Uint32, 
        Int32,  
        String, 
        Float,  
        List    
    } type;   
 
    value()
        : v_int32{0}
        , type{Type::Int32}
    {
    }


    value(bool v)
        : v_bool{v}
        , type{Type::Bool}
    {
    }
 
    value(uint32_t v)
        : v_uint32{v}
        , type{Type::Uint32}
    {
    }
 
    value(int32_t v)
        : v_int32{v}
        , type{Type::Int32}
    {
    }
 
    value(const char* v)
        : v_string{v}
        , type{Type::String}
    {
    }
 
    value(float v)
        : v_float{v}
        , type{Type::Float}
    {
    }
 
    value(list_interface* list)
        : v_list{list}
        , type{Type::List}
    {
    }
 
    value(const value& v)
        : v_string{nullptr}
        , type{v.type}
    {
        switch (type) {
            case Type::Bool: v_bool = v.v_bool; break;
            case Type::Uint32: v_uint32 = v.v_uint32; break;
            case Type::Int32: v_int32 = v.v_int32; break;
            case Type::String: v_string = v.v_string; break;
            case Type::Float: v_float = v.v_float; break;
            case Type::List: v_list = v.v_list; break;
        }
    }
 
    constexpr value& operator=(const value& v)
    {
        type = v.type;
        switch (type) {
            case Type::Bool: v_bool = v.v_bool; break;
            case Type::Uint32: v_uint32 = v.v_uint32; break;
            case Type::Int32: v_int32 = v.v_int32; break;
            case Type::String: v_string = v.v_string; break;
            case Type::Float: v_float = v.v_float; break;
            case Type::List: v_list = v.v_list; break;
        }
        return *this;
    }


    template<Type Ty>
    const auto& get() const
    {
        static_assert(Ty != Ty, "No value getter for the selected type");
    }
};

template<>
inline const auto& value::get<value::Type::Bool>() const
{
    inkAssert(type == value::Type::Bool, "Expected type bool, if a boolean should be readed");
    return v_bool;
}

template<>
inline const auto& value::get<value::Type::Uint32>() const
{
    inkAssert(type == value::Type::Uint32, "Expected type uint32, if a boolean should be readed");
    return v_uint32;
}

template<>
inline const auto& value::get<value::Type::Int32>() const
{
    inkAssert(type == value::Type::Int32, "Expected type int32, if a boolean should be readed");
    return v_int32;
}

template<>
inline const auto& value::get<value::Type::String>() const
{
    inkAssert(type == value::Type::String, "Expected type string, if a boolean should be readed");
    return v_string;
}

template<>
inline const auto& value::get<value::Type::Float>() const
{
    inkAssert(type == value::Type::Float, "Expected type float, if a boolean should be readed");
    return v_float;
}

template<>
inline const auto& value::get<value::Type::List>() const
{
    inkAssert(type == value::Type::List, "Expected type list, if a boolean should be readed");
    return v_list;
}
} // namespace ink::runtime