/// <summary>
/// Infer from the input string what type it is, and return the field as that type
/// (int, long, decimal, double, bool or string)
/// </summary>
/// <param name="input">the input sting</param>
/// <returns>the value cast to the type it could be parsed into</returns>
public static object CastToInferredType(this string input)
{
var target = input;
// we infer hex numbers to be signed; size in bytes determines which return value to be used
// (byte, short, int, long)
if (NumericFunctions.TryParseHex(input, true, out var hexValue))
{
target = hexValue.ToString();
}
if (int.TryParse(target, out var intValue))
{
return(intValue);
}
if (long.TryParse(target, out var longValue))
{
return(longValue);
}
if (decimal.TryParse(target, out var decimalValue))
{
return(decimalValue);
}
if (double.TryParse(target, out var doubleValue))
{
return(doubleValue);
}
if (bool.TryParse(target, out var boolValue))
{
return(boolValue);
}
return(input);
}
private static object ChangeType(object value, Type targetType)
{
var source = value;
// if we want a numeric result and we have a hex value, convert the hex to long first.
if (targetType.IsNumeric() &&
NumericFunctions.TryParseHex(value?.ToString(), targetType.IsSigned(), out var hexValue))
{
source = hexValue;
}
try
{
return(Convert.ChangeType(source, targetType, InvariantCulture));
}
catch (Exception e) when(e is FormatException || e is InvalidCastException)
{
try
{
return(Convert.ChangeType(source, targetType, CurrentUICulture));
}
catch (Exception fe) when(fe is FormatException || fe is InvalidCastException)
{
throw new FormatException(Invariant($"Could not convert '{value}' to {targetType.Name}"), fe);
}
}
}
/// <summary>
/// Get the type that the input value can be parsed into (int, long, double, bool, string)
/// </summary>
/// <param name="value">the value to be examined</param>
/// <returns>The type it was successfully parsed into</returns>
public static Type InferType(this object value)
{
var stringValue = value?.ToString();
// we infer hex numbers to be signed, see CastToInferredType
if (NumericFunctions.TryParseHex(stringValue, true, out var hexValue))
{
stringValue = hexValue.ToString();
}
if (int.TryParse(stringValue, NumberStyles.Integer, InvariantCulture, out _))
{
return(typeof(int));
}
if (long.TryParse(stringValue, NumberStyles.Integer, InvariantCulture, out _))
{
return(typeof(long));
}
if (double.TryParse(stringValue, NumberStyles.Any, InvariantCulture, out _))
{
return(typeof(double));
}
if (double.TryParse(stringValue, NumberStyles.Any, CurrentUICulture, out _))
{
return(typeof(double));
}
return(bool.TryParse(stringValue, out _) ? typeof(bool) : typeof(string));
}
