T4 file for generate common operator on C# object

ObjectProxyOperator.tt

<#@ output extension=".cs" #>
class ObjectProxyOperator
{
<#
	{
	var types = new[]{ "sbyte","byte","short","ushort","int","uint","long","ulong","float","double","decimal" };
	foreach(var pair in new System.Collections.Generic.Dictionary<string,string>() { ["Add"] = "+",["Subtract"] = "-",["Multiply"] = "*",["Divide"] = "/",["Mod"] = "%" })
	{
		var func = pair.Key;
		var op = pair.Value;
#>
	public static object <#=func#>(object left,object right)
	{
		switch(left)
		{
<#
		foreach(var ltype in types)
		{
#>			case <#=ltype#> l:
				switch(right)
				{
<#
			foreach(var rtype in types)
			{
				if(ltype == "decimal" && (rtype == "float" || rtype == "double"))
					continue;
				if(rtype == "decimal" && (ltype == "float" || ltype == "double"))
					continue;
					
				if(ltype == "ulong" && (rtype == "sbyte" || rtype == "short" || rtype == "int" || rtype == "long"))
					continue;
				if(rtype == "ulong" && (ltype == "sbyte" || ltype == "short" || ltype == "int" || ltype == "long"))
					continue;

#>					case <#=rtype#> r:
						return l <#=op#> r;
<#
			}
#>					default:
						return <#if(op == "+")#>(right is string rs) ? l + rs : null;<#else#>null;<# #>
				}
<#
		}
#>			default:
				return null;
		}
	}
<#
	}
	}
#>

<#
	{
	var ltypes = new[]{ "sbyte","byte","short","ushort","int","uint","long" };
	var rtypes = new[]{ "sbyte","byte","short","ushort","int" };
	foreach(var pair in new System.Collections.Generic.Dictionary<string,string>() { ["Shift"] = "<<",["Unshift"] = ">>" })
	{
		var func = pair.Key;
		var op = pair.Value;
#>
	public static object <#=func#>(object left,object right)
	{
		switch(left)
		{
<#
		foreach(var ltype in ltypes)
		{
#>			case <#=ltype#> l:
				switch(right)
				{
<#
			foreach(var rtype in rtypes)
			{
#>					case <#=rtype#> r:
						return l <#=op#> r;
<#
			}
#>					default:
					case string s:
						return null;
					case System.IConvertible ico when int.TryParse(ico.ToString(),out int r):
						return l <#=op#> r;
				}
<#
		}
#>			default:
				return null;
		}
	}
<#
	}
	}
#>
}