/**
* This method compares the specified object with the current object for order.
*
* @access public
* @static
* @param IOption\Type $xs the left operand
* @param IOption\Type $ys the object to be compared
* @return ITrit\Type whether the current object is less than,
* equal to, or greater than the specified
* object
*/
public static function compare(IOption\Type $xs, IOption\Type $ys) : ITrit\Type
{
$x = $xs->__isDefined();
$y = $ys->__isDefined();
if (!$x && $y) {
return ITrit\Type::negative();
}
if (!$x && !$y) {
return ITrit\Type::zero();
}
if ($x && !$y) {
return ITrit\Type::positive();
}
$x = $xs->item();
$y = $ys->item();
if ($x === null && $y !== null) {
return ITrit\Type::negative();
}
if ($x === null && $y === null) {
return ITrit\Type::zero();
}
if ($x !== null && $y === null) {
return ITrit\Type::positive();
}
if ($x instanceof Core\Comparable\Type) {
return call_user_func_array(array($x, 'compare'), array($y));
}
return IString\Module::compare(Core\Module::hashCode($x), Core\Module::hashCode($y));
}
/**
* This method returns the numerically lowest value.
*
* @access public
* @static
* @param IString\Type $xs the left operand
* @param IString\Type $ys the right operand
* @return IString\Type the minimum value
*/
public static function min(IString\Type $xs, IString\Type $ys) : IString\Type
{
return IString\Module::compare($xs, $ys)->unbox() <= 0 ? $xs : $ys;
}
