/**
* Compares with another dimension
*
* @param Node $other
* @return integer
*/
public function compare(Node $other)
{
if (!$other instanceof DimensionNode) {
return null;
}
if ($this->unit->isEmpty() || $other->unit->isEmpty()) {
$a = $this;
$b = $other;
} else {
$a = $this->unify();
$b = $other->unify();
if ($a->unit->compare($b->unit) !== 0) {
return null;
}
}
return Util::numericCompare($a->value, $b->value);
}
