Symbol

Symbol is base variable container. For minimize amount of errors and better use of IDE features such as syntax suggesting. Plc Data type is defined by generic argument.

public abstract class Symbol<TDataType> : Symbol, ISymbol<TDataType>
        where TDataType : IPlcDataType
{
    protected Symbol(string name, object parent) : base(name, parent)
    {
    }

    protected Symbol(object parent) : base(parent)
    {
    }

    protected Symbol()
    {
    }
}

To see symbol usage, take a look at Tag, DB, Basic Logic and Call Logic.

Data types is divide on 2 general sub types and because of it exist two symbol class.

SimpleSymbol#

Simple symbol is for don't has sub elements and type field is static.

public class SimpleSymbol<TDataType> : Symbol<TDataType>, ISimpleVariable<TDataType>
        where TDataType : ISimpleDataType, new()
{
    #region Constructor

    protected SimpleSymbol(string name, object parent) : base(name, parent)
    {
    }

    #endregion

    #region Properties

    public static TDataType Type { get; } = new();

    public override IPlcDataType BaseDataType => Type;

    #endregion
}

StructSymbol#

Struct symbol has referenced type and for all instance it is different.

public class StructSymbol<TDataType> : Symbol<TDataType>, IStructVariable<TDataType>
        where TDataType : IStructDataType
{
    public StructSymbol(string name, object parent = null) : base(name, parent)
    {
        Type = (TDataType) Activator.CreateInstance(typeof(TDataType), this);
    }

    public StructSymbol(string name, Func<object, TDataType> type, object parent = null) : base(name, parent)
    {
        Type = type.Invoke(this);
    }


    #region Properties

    public TDataType Type { get; }

    public override IPlcDataType BaseDataType => Type;

    #endregion
}