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<?php
namespace Money\Calculator;
use Money\Calculator;
use Money\Money;
use Money\Number;
/**
* @author Frederik Bosch <f.bosch@genkgo.nl>
*/
final class PhpCalculator implements Calculator
{
/**
* {@inheritdoc}
*/
public static function supported()
{
return true;
}
/**
* {@inheritdoc}
*/
public function compare($a, $b)
{
return ($a < $b) ? -1 : (($a > $b) ? 1 : 0);
}
/**
* {@inheritdoc}
*/
public function add($amount, $addend)
{
$result = $amount + $addend;
$this->assertInteger($result);
return (string) $result;
}
/**
* {@inheritdoc}
*/
public function subtract($amount, $subtrahend)
{
$result = $amount - $subtrahend;
$this->assertInteger($result);
return (string) $result;
}
/**
* {@inheritdoc}
*/
public function multiply($amount, $multiplier)
{
$result = $amount * $multiplier;
$this->assertIntegerBounds($result);
return (string) Number::fromNumber($result);
}
/**
* {@inheritdoc}
*/
public function divide($amount, $divisor)
{
$result = $amount / $divisor;
$this->assertIntegerBounds($result);
return (string) Number::fromNumber($result);
}
/**
* {@inheritdoc}
*/
public function ceil($number)
{
return $this->castInteger(ceil($number));
}
/**
* {@inheritdoc}
*/
public function floor($number)
{
return $this->castInteger(floor($number));
}
/**
* {@inheritdoc}
*/
public function absolute($number)
{
$result = ltrim($number, '-');
$this->assertIntegerBounds($result);
return (string) $result;
}
/**
* {@inheritdoc}
*/
public function round($number, $roundingMode)
{
if (Money::ROUND_HALF_POSITIVE_INFINITY === $roundingMode) {
$number = Number::fromNumber($number);
if ($number->isHalf()) {
return $this->castInteger(ceil((string) $number));
}
return $this->castInteger(round((string) $number, 0, Money::ROUND_HALF_UP));
}
if (Money::ROUND_HALF_NEGATIVE_INFINITY === $roundingMode) {
$number = Number::fromNumber($number);
if ($number->isHalf()) {
return $this->castInteger(floor((string) $number));
}
return $this->castInteger(round((string) $number, 0, Money::ROUND_HALF_DOWN));
}
return $this->castInteger(round($number, 0, $roundingMode));
}
/**
* {@inheritdoc}
*/
public function share($amount, $ratio, $total)
{
return $this->castInteger(floor($amount * $ratio / $total));
}
/**
* {@inheritdoc}
*/
public function mod($amount, $divisor)
{
$result = $amount % $divisor;
$this->assertIntegerBounds($result);
return (string) $result;
}
/**
* Asserts that an integer value didn't become something else
* (after some arithmetic operation).
*
* @param int $amount
*
* @throws \OverflowException If integer overflow occured
* @throws \UnderflowException If integer underflow occured
*/
private function assertIntegerBounds($amount)
{
if ($amount > PHP_INT_MAX) {
throw new \OverflowException('You overflowed the maximum allowed integer (PHP_INT_MAX)');
} elseif ($amount < ~PHP_INT_MAX) {
throw new \UnderflowException('You underflowed the minimum allowed integer (PHP_INT_MAX)');
}
}
/**
* Casts an amount to integer ensuring that an overflow/underflow did not occur.
*
* @param int $amount
*
* @return string
*/
private function castInteger($amount)
{
$this->assertIntegerBounds($amount);
return (string) intval($amount);
}
/**
* Asserts that integer remains integer after arithmetic operations.
*
* @param int $amount
*/
private function assertInteger($amount)
{
if (filter_var($amount, FILTER_VALIDATE_INT) === false) {
throw new \UnexpectedValueException('The result of arithmetic operation is not an integer');
}
}
}