public void ConvertRounding()
{
ConvertExpression e = new("[in->ft]");
Assert.IsNotNull(e);
PreciseNumber feet = e.Evaluate(new PreciseNumber[] { new PreciseNumber(120m) });
Assert.IsTrue(feet.HasValue);
Assert.AreEqual(10, feet.Value);
}
/// <summary>Convert the numbers to the new unit.</summary>
/// <param name="numbers">The numbers used in the conversion.</param>
/// <returns>The result of the conversion execution.</returns>
/// <exception cref="ArgumentNullException">When numbers is null.</exception>
/// <exception cref="ArgumentException">When the length of numbers do not equal <see cref="ArgumentCount"/>.</exception>
public PreciseNumber Evaluate(PreciseNumber[] operands)
{
((IExpression)this).Validate(operands);
PreciseNumber fromValue = operands[0];
if (!fromValue.HasValue)
{
return(fromValue);
}
return(_current.UnitType switch
{
UnitType.Length => new PreciseNumber(LengthConverter.Convert((LengthUnit)_current.FromUnit, (LengthUnit)_current.ToUnit, fromValue.Value)),
UnitType.Mass => new PreciseNumber(MassConverter.Convert((MassUnit)_current.FromUnit, (MassUnit)_current.ToUnit, fromValue.Value)),
UnitType.Speed => new PreciseNumber(SpeedConverter.Convert((SpeedUnit)_current.FromUnit, (SpeedUnit)_current.ToUnit, fromValue.Value)),
UnitType.Temperature => new PreciseNumber(TemperatureConverter.Convert((TemperatureUnit)_current.FromUnit, (TemperatureUnit)_current.ToUnit, fromValue.Value)),
UnitType.Time => new PreciseNumber(TimeConverter.Convert((TimeUnit)_current.FromUnit, (TimeUnit)_current.ToUnit, fromValue.Value)),
UnitType.Volume => new PreciseNumber(VolumeConverter.Convert((VolumeUnit)_current.FromUnit, (VolumeUnit)_current.ToUnit, fromValue.Value)),
_ => throw new ArgumentOutOfRangeException(nameof(operands)),
});
