// In an operation between two Dimensions,
// we default to the first Number's unit,
// so `1px + 2em` will yield `3px`.
// In the future, we could implement some unit
// conversions such that `100cm + 10mm` would yield
// `101cm`.
public Node Operate(Operation op, Node other)
{
Guard.ExpectNode<Number>(other, "right hand side of " + op.Operator, op.Index);
var dim = (Number) other;
var unit = Unit;
var otherUnit = dim.Unit;
if (unit == otherUnit && op.Operator == "/")
unit = "";
else if (string.IsNullOrEmpty(unit))
unit = otherUnit;
else if (!string.IsNullOrEmpty(otherUnit))
{
// convert units
}
return new Number(Operation.Operate(op.Operator, Value, dim.Value), unit);
}
