/**
* Performs unit analysis of a given infix operation. The first unit (non-scalar token)
* encountered is returned, except with division. In that case, scalar is returned if both units
* are the same and points is returned when dividing inches and points.
*
* @param u1 left-hand unit
* @param u2 right-hand unit
* @param op operator
* @return Token containing resultant unit.
*/
public static ValueType evaluateUnits(ValueType u1, ValueType u2, Token op) {
String unit = "SCALAR"; // default ValueType
final String left = u1.toString();
final String right = u2.toString();
switch (op.text) {
case "/":
// In the case of division, we need only to be concerned in situations where
// the final unit is not scalar
if (!u1.toString().equals(right)) {
if (left.equals("SCALAR")) {
unit = right;
break;
}
if (right.equals("SCALAR")) {
unit = left;
break;
}
}
break;
default:
if (left.equals("SCALAR")) {
unit = right;
break;
}
if (right.equals("SCALAR")) {
unit = left;
break;
}
unit = left;
break;
}
return ValueType.valueOf(unit);
}
@Override
public String getText() {
return value.toString();
}
/**
* Initialises the value tuple.
*
* @param type
* @param value
*/
public ValueTuple(ValueType type, Object value) {
this(type.toString(), value);
}