/**
* isSameValueAs
*
* ValueObject comparison
*
* @author Christopher Tatro <*****@*****.**>
* @since 1.1.0
*
* @param Fraction $fraction
*
* @return bool
*/
public function isSameValueAs(Fraction $fraction)
{
if ($this->getNumerator() != $fraction->getNumerator()) {
return false;
}
if ($this->getDenominator() != $fraction->getDenominator()) {
return false;
}
return true;
}
/**
* Subtract a given fraction from this fraction
*
* @author Tom Haskins-Vaughan <*****@*****.**>
* @since 0.1.0
*
* @param Fraction $fraction
*
* @return Fraction
*/
public function subtract(Fraction $fraction)
{
$numerator = $this->getNumerator() * $fraction->getDenominator() - $fraction->getNumerator() * $this->getDenominator();
$denominator = $this->getDenominator() * $fraction->getDenominator();
return new static($numerator, $denominator);
}
/**
* Test isSameValueAs
*
* @author Christopher Tatro <*****@*****.**>
* @since 1.1.0
*
* @dataProvider isSameValueAsProvider
*/
public function testIsSameValueAs($numerator1, $denominator1, $numerator2, $denominator2, $result)
{
$fraction = new Fraction($numerator1, $denominator1);
$this->assertSame($result, $fraction->isSameValueAs(new Fraction($numerator2, $denominator2)));
}
/**
* Test fromString exception
*
* @author Tom Haskins-Vaughan <*****@*****.**>
* @since 0.4.0
*
* @expectedException \InvalidArgumentException
* @dataProvider fromStringExceptionProvider
*/
public function testFromStringException($string)
{
Fraction::fromString($string);
}
/**
* 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()));
}
