/// <summary>
/// Creates function wrapper
/// </summary>
/// <param name="kw">Keyword, which is checked for validity</param>
/// <param name="f">Function</param>
public Function(string kw, Func <IArgument[], Engine, object> f)
{
if (string.IsNullOrWhiteSpace(kw))
{
throw new ArgumentException("Keyword cannot be empty");
}
if (!CharSource.IsNameStart(kw[0]))
{
throw new ArgumentException("Keyword must start with letter or underscore");
}
keyword = kw;
function = f ?? ((a, e) => null);
}
