private static void CheckMissingArgument(int i, int argsLength, bool isShortName, ArgumentAttribute argAttr)
{
if (i < argsLength)
{
return;
}
Console.WriteLine($"Missing value for argument {(isShortName ? ("-" + argAttr.ShortName) : ("--" + argAttr.Name))}");
throw new ArgumentException("Unable to parse arguments");
}
public static T Parse <T>(string[] arguments) where T : new()
{
var obj = new T();
var type = typeof(T);
for (int i = 0; i < arguments.Length; i++)
{
var parsed = false;
if (arguments[i] == "--help" || arguments[i] == "-h")
{
WriteHelp <T>();
throw new HelpShownException();
}
if (arguments[i].StartsWith("-"))
{
foreach (var property in type.GetProperties())
{
var attrs = property.GetCustomAttributes(false);
ArgumentAttribute argAttr = null;
var isShortName = false;
foreach (var attr in attrs)
{
var tmpArgAttr = attr as ArgumentAttribute;
if (tmpArgAttr != null &&
((tmpArgAttr.Name != null && "--" + tmpArgAttr.Name == arguments[i]) ||
(tmpArgAttr.ShortName != null && "-" + tmpArgAttr.ShortName == arguments[i])))
{
isShortName = !arguments[i].StartsWith("--");
argAttr = tmpArgAttr;
break;
}
}
if (argAttr != null)
{
var typeCode = Type.GetTypeCode(property.PropertyType);
switch (typeCode)
{
case TypeCode.String:
i++;
CheckMissingArgument(i, arguments.Length, isShortName, argAttr);
property.SetValue(obj, arguments[i]);
break;
case TypeCode.Int16:
i++;
CheckMissingArgument(i, arguments.Length, isShortName, argAttr);
try
{
property.SetValue(obj, Convert.ToInt16(arguments[i], CultureInfo.InvariantCulture.NumberFormat));
}
catch (FormatException)
{
Console.WriteLine($"\t Error: {(isShortName ? ("-" + argAttr.ShortName) : ("--" + argAttr.Name))} value must be a 2 bytes number");
throw;
}
break;
case TypeCode.Int32:
i++;
CheckMissingArgument(i, arguments.Length, isShortName, argAttr);
try
{
property.SetValue(obj, Convert.ToInt32(arguments[i], CultureInfo.InvariantCulture.NumberFormat));
}
catch (FormatException)
{
Console.WriteLine($"\t Error: {(isShortName ? ("-" + argAttr.ShortName) : ("--" + argAttr.Name))} value must be a 4 bytes number");
throw;
}
break;
case TypeCode.Int64:
i++;
CheckMissingArgument(i, arguments.Length, isShortName, argAttr);
try
{
property.SetValue(obj, Convert.ToInt64(arguments[i], CultureInfo.InvariantCulture.NumberFormat));
}
catch (FormatException)
{
Console.WriteLine($"\t Error: {(isShortName ? ("-" + argAttr.ShortName) : ("--" + argAttr.Name))} value must be a 8 bytes number");
throw;
}
break;
case TypeCode.Single:
i++;
CheckMissingArgument(i, arguments.Length, isShortName, argAttr);
try
{
property.SetValue(obj, Convert.ToSingle(arguments[i], CultureInfo.InvariantCulture.NumberFormat));
}
catch (FormatException)
{
Console.WriteLine($"\t Error: {(isShortName ? ("-" + argAttr.ShortName) : ("--" + argAttr.Name))} value must be a decimal number");
throw;
}
break;
case TypeCode.Double:
i++;
CheckMissingArgument(i, arguments.Length, isShortName, argAttr);
try
{
property.SetValue(obj, Convert.ToDouble(arguments[i], CultureInfo.InvariantCulture.NumberFormat));
}
catch (FormatException)
{
Console.WriteLine($"\t Error: {(isShortName ? ("-" + argAttr.ShortName) : ("--" + argAttr.Name))} value must be a decimal number");
throw;
}
break;
case TypeCode.Boolean:
property.SetValue(obj, true);
break;
default:
throw new UnsupportedTypeException("This type is not supported");
}
parsed = true;
break;
}
}
}
if (parsed == false)
{
Console.WriteLine($"Unknown argument {arguments[i]}");
throw new ArgumentException($"Unknown argument {arguments[i]}");
}
}
return(obj);
}
