public object?Parse(ParserState args, Type toType)
{
if (toType.IsArray)
{
return(ParseArray(args, toType));
}
var temp = args.Clone();
string Consume()
{
if (!temp.HasCurrent)
{
throw new CommandLineException(args, "Value is missing.");
}
return(temp.Consume());
}
try
{
if (toType == typeof(bool))
{
return(bool.Parse(Consume()));
}
else if (toType == typeof(int))
{
return(int.Parse(Consume()));
}
else if (toType == typeof(double))
{
return(double.Parse(Consume()));
}
else if (toType == typeof(string))
{
return(Consume());
}
else if (toType.IsEnum)
{
var enumName = Enum.GetNames(toType).FindByName(_ => Parser.LongNameForCsharpIdentifier(_), Consume(), "values");
return(Enum.Parse(toType, enumName));
}
throw new ArgumentException($"Cannot parse {args.Current.Quote()} as {toType.Name}.");
}
catch (Exception e)
{
temp.SetPos(args);
if (e is CommandLineException)
{
throw;
}
throw new CommandLineException(args, $"{args.Current.Quote()} is not a value of type {toType.Name}.", e);
}
finally
{
args.SetPos(temp);
}
}
public object?ParseArray(ParserState args, Type toType)
{
var temp = args.Clone();
var elementType = toType.GetElementType();
var items = new List <object?>();
while (temp.HasCurrent)
{
var item = Parse(temp, elementType);
items.Add(item);
}
args.SetPos(temp);
var a = Array.CreateInstance(elementType, items.Count);
for (int i = 0; i < a.Length; ++i)
{
a.SetValue(items[i], i);
}
return(a);
}
