/// <summary>
/// Loads a module containing custom functions to the formula parser. By using
/// this method you can add your own implementations of Excel functions, by
/// implementing a <see cref="IFunctionModule"/>.
/// </summary>
/// <param name="module">A <see cref="IFunctionModule"/> containing <see cref="ExcelFunction"/>s.</param>
public void LoadFunctionModule(IFunctionModule module)
{
_parser.Configure(x => x.FunctionRepository.LoadModule(module));
}
/// <summary>
/// If the supplied <paramref name="functionName"/> does not exist, the supplied
/// <paramref name="functionImpl"/> implementation will be added to the formula parser.
/// If it exists, the existing function will be replaced by the supplied <paramref name="functionImpl">function implementation</paramref>
/// </summary>
/// <param name="functionName"></param>
/// <param name="functionImpl"></param>
public void AddOrReplaceFunction(string functionName, ExcelFunction functionImpl)
{
_parser.Configure(x => x.FunctionRepository.AddOrReplaceFunction(functionName, functionImpl));
}