/// <summary>
/// Converts the given object, when it is of type <see cref="string"/> to the type of this converter, using the specified context and culture information.
/// </summary>
/// <param name="context">An System.ComponentModel.ITypeDescriptorContext that provides a format context.</param>
/// <param name="culture">The System.Globalization.CultureInfo to use as the current culture.</param>
/// <param name="value">The System.Object to convert.</param>
/// <returns>An <see cref="IQuantity"/> object.</returns>
/// <exception cref="System.NotSupportedException">The conversion cannot be performed.</exception>
/// <exception cref="ArgumentException">Unit value is not a know unit enum type.</exception>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
string stringValue = value as string;
object result = null;
if (!string.IsNullOrEmpty(stringValue))
{
if (double.TryParse(stringValue, NumberStyles.Any, culture, out double dvalue))
{
DefaultUnitAttribute defaultUnit = GetAttribute <DefaultUnitAttribute>(context) ?? new DefaultUnitAttribute(default(TQuantity).Unit);
result = Quantity.From(dvalue, defaultUnit.UnitType);
}
else
{
result = Quantity.Parse(culture, typeof(TQuantity), stringValue);
}
ConvertToUnitAttribute convertToUnit = GetAttribute <ConvertToUnitAttribute>(context);
if (convertToUnit != null)
{
result = ((IQuantity)result).ToUnit(convertToUnit.UnitType);
}
}
return(result ?? base.ConvertFrom(context, culture, value));
}
/// <summary>
/// Converts the given object, when it is of type <see cref="string"/> to the type of this converter, using the specified context and culture information.
/// </summary>
/// <param name="context">An System.ComponentModel.ITypeDescriptorContext that provides a format context.</param>
/// <param name="culture">The System.Globalization.CultureInfo to use as the current culture.</param>
/// <param name="value">The System.Object to convert.</param>
/// <returns>An <see cref="IQuantity"/> object.</returns>
/// <exception cref="System.NotSupportedException">The conversion cannot be performed.</exception>
/// <exception cref="ArgumentException">Unit value is not a know unit enum type.</exception>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
string stringValue = value as string;
object result = null;
if (!string.IsNullOrEmpty(stringValue))
{
if (double.TryParse(stringValue, NumberStyles.Any, culture, out double dvalue))
{
DefaultUnitAttribute defaultUnit = GetAttribute <DefaultUnitAttribute>(context) ?? new DefaultUnitAttribute(default(TQuantity).Unit);
result = Quantity.From(dvalue, defaultUnit.UnitType);
}
else
{
// TODO this should not be part of QuantityTypeConverter. it should rather be part of the parse function
stringValue = stringValue.Replace("^-9", "⁻⁹");
stringValue = stringValue.Replace("^-8", "⁻⁸");
stringValue = stringValue.Replace("^-7", "⁻⁷");
stringValue = stringValue.Replace("^-6", "⁻⁶");
stringValue = stringValue.Replace("^-5", "⁻⁵");
stringValue = stringValue.Replace("^-4", "⁻⁴");
stringValue = stringValue.Replace("^-3", "⁻³");
stringValue = stringValue.Replace("^-2", "⁻²");
stringValue = stringValue.Replace("^-1", "⁻¹");
stringValue = stringValue.Replace("^1", "");
stringValue = stringValue.Replace("^2", "²");
stringValue = stringValue.Replace("^3", "³");
stringValue = stringValue.Replace("^4", "⁴");
stringValue = stringValue.Replace("^5", "⁵");
stringValue = stringValue.Replace("^6", "⁶");
stringValue = stringValue.Replace("^7", "⁷");
stringValue = stringValue.Replace("^8", "⁸");
stringValue = stringValue.Replace("^9", "⁹");
stringValue = stringValue.Replace("*", "·");
result = Quantity.Parse(culture, typeof(TQuantity), stringValue);
}
ConvertToUnitAttribute convertToUnit = GetAttribute <ConvertToUnitAttribute>(context);
if (convertToUnit != null)
{
result = ((IQuantity)result).ToUnit(convertToUnit.UnitType);
}
}
return(result ?? base.ConvertFrom(context, culture, value));
}
