/**
* Create Quantity from a string, e.g.
*
* * 1 LB
* * 0.5 KG
* * 1/2 OZ
*
* @author Tom Haskins-Vaughan <*****@*****.**>
* @since 0.12.0
*
* @param string $string
*
* @return mixed
*/
public static function fromString($string)
{
// trim white space
$string = trim($string);
// look for the first Uom at the end of the string
foreach (Uom::getUoms() as $uomGroup) {
foreach ($uomGroup as $uomName => $description) {
$expectedPostion = strlen($string) - strlen($uomName);
$actualPosition = strpos($string, $uomName);
if ($expectedPostion === $actualPosition) {
// ok, we've found a Uom, remove it, leaving the amount
$amountAsString = trim(str_replace($uomName, '', $string));
// now see if the rest is a fraction
try {
return new static(Fraction::fromString($amountAsString), new Uom($uomName));
} catch (InvalidArgumentException $e) {
}
// no, so see if it is float
return new static(Fraction::fromFloat($amountAsString), new Uom($uomName));
}
}
}
throw new InvalidArgumentException(sprintf('Cannot parse "%s" as a %s', $string, get_called_class()));
}
