/// <summary>
/// Attempts to set the value by either TypeDescriptor.GetConverter or by a custom implementation was passed using UseSetter. returns bool of indicating success of setting the value.
/// </summary>
/// <param name="value"></param>
/// <param name="err"></param>
/// <returns></returns>
public bool TrySetValue(string value, out ParsingError err)
{
try
{
if (_setter != null)
{
_value = _setter(_value, value);
_hasValue = true;
}
else
{
var converter = TypeDescriptor.GetConverter(typeof(T));
_value = (T)converter.ConvertFrom(value);
_hasValue = true;
}
err = null;
return(true);
}
catch (Exception e)
{
if (e?.InnerException is OverflowException)
{
err = new ParsingError("value out of range", e);
}
else
{
err = new ParsingError("parse error", e);
}
return(false);
}
}
internal ParsingError FailF(string format, params object[] args)
{
var error = new ParsingError(string.Format(format, args));
Output().Write($"{error}\n");
Usage();
return(error);
}