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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 GmpCalculator implements Calculator
{
/**
* @var string
*/
private $scale;
/**
* @param int $scale
*/
public function __construct($scale = 14)
{
$this->scale = $scale;
}
/**
* {@inheritdoc}
*/
public static function supported()
{
return extension_loaded('gmp');
}
/**
* {@inheritdoc}
*/
public function compare($a, $b)
{
$aNum = Number::fromNumber($a);
$bNum = Number::fromNumber($b);
if ($aNum->isDecimal() || $bNum->isDecimal()) {
$integersCompared = gmp_cmp($aNum->getIntegerPart(), $bNum->getIntegerPart());
if ($integersCompared !== 0) {
return $integersCompared;
}
$aNumFractional = $aNum->getFractionalPart() === '' ? '0' : $aNum->getFractionalPart();
$bNumFractional = $bNum->getFractionalPart() === '' ? '0' : $bNum->getFractionalPart();
return gmp_cmp($aNumFractional, $bNumFractional);
}
return gmp_cmp($a, $b);
}
/**
* {@inheritdoc}
*/
public function add($amount, $addend)
{
return gmp_strval(gmp_add($amount, $addend));
}
/**
* {@inheritdoc}
*/
public function subtract($amount, $subtrahend)
{
return gmp_strval(gmp_sub($amount, $subtrahend));
}
/**
* {@inheritdoc}
*/
public function multiply($amount, $multiplier)
{
$multiplier = Number::fromNumber($multiplier);
if ($multiplier->isDecimal()) {
$decimalPlaces = strlen($multiplier->getFractionalPart());
$multiplierBase = $multiplier->getIntegerPart();
if ($multiplierBase) {
$multiplierBase .= $multiplier->getFractionalPart();
} else {
$multiplierBase = ltrim($multiplier->getFractionalPart(), '0');
}
$resultBase = gmp_strval(gmp_mul(gmp_init($amount), gmp_init($multiplierBase)));
if ('0' === $resultBase) {
return '0';
}
$result = substr($resultBase, $decimalPlaces * -1);
$resultLength = strlen($result);
if ($decimalPlaces > $resultLength) {
return '0.'.str_pad('', $decimalPlaces - $resultLength, '0').$result;
}
return substr($resultBase, 0, $decimalPlaces * -1).'.'.$result;
}
return gmp_strval(gmp_mul(gmp_init($amount), gmp_init((string) $multiplier)));
}
/**
* {@inheritdoc}
*/
public function divide($amount, $divisor)
{
$divisor = Number::fromNumber($divisor);
if ($divisor->isDecimal()) {
$decimalPlaces = strlen($divisor->getFractionalPart());
if ($divisor->getIntegerPart()) {
$divisor = new Number($divisor->getIntegerPart().$divisor->getFractionalPart());
} else {
$divisor = new Number(ltrim($divisor->getFractionalPart(), '0'));
}
$amount = gmp_strval(gmp_mul(gmp_init($amount), gmp_init('1'.str_pad('', $decimalPlaces, '0'))));
}
list($integer, $remainder) = gmp_div_qr(gmp_init($amount), gmp_init((string) $divisor));
if (gmp_cmp($remainder, '0') === 0) {
return gmp_strval($integer);
}
$divisionOfRemainder = gmp_strval(
gmp_div_q(
gmp_mul($remainder, gmp_init('1'.str_pad('', $this->scale, '0'))),
gmp_init((string) $divisor),
GMP_ROUND_MINUSINF
)
);
if ($divisionOfRemainder[0] === '-') {
$divisionOfRemainder = substr($divisionOfRemainder, 1);
}
return gmp_strval($integer).'.'.str_pad($divisionOfRemainder, $this->scale, '0', STR_PAD_LEFT);
}
/**
* {@inheritdoc}
*/
public function ceil($number)
{
$number = Number::fromNumber($number);
if ($number->isInteger()) {
return (string) $number;
}
if ($number->isNegative()) {
return $this->add($number->getIntegerPart(), '0');
}
return $this->add($number->getIntegerPart(), '1');
}
/**
* {@inheritdoc}
*/
public function floor($number)
{
$number = Number::fromNumber($number);
if ($number->isInteger()) {
return (string) $number;
}
if ($number->isNegative()) {
return $this->add($number->getIntegerPart(), '-1');
}
return $this->add($number->getIntegerPart(), '0');
}
/**
* {@inheritdoc}
*/
public function absolute($number)
{
return ltrim($number, '-');
}
/**
* {@inheritdoc}
*/
public function round($number, $roundingMode)
{
$number = Number::fromNumber($number);
if ($number->isInteger()) {
return (string) $number;
}
if ($number->isHalf() === false) {
return $this->roundDigit($number);
}
if (Money::ROUND_HALF_UP === $roundingMode) {
return $this->add(
$number->getIntegerPart(),
$number->getIntegerRoundingMultiplier()
);
}
if (Money::ROUND_HALF_DOWN === $roundingMode) {
return $this->add($number->getIntegerPart(), '0');
}
if (Money::ROUND_HALF_EVEN === $roundingMode) {
if ($number->isCurrentEven()) {
return $this->add($number->getIntegerPart(), '0');
}
return $this->add(
$number->getIntegerPart(),
$number->getIntegerRoundingMultiplier()
);
}
if (Money::ROUND_HALF_ODD === $roundingMode) {
if ($number->isCurrentEven()) {
return $this->add(
$number->getIntegerPart(),
$number->getIntegerRoundingMultiplier()
);
}
return $this->add($number->getIntegerPart(), '0');
}
if (Money::ROUND_HALF_POSITIVE_INFINITY === $roundingMode) {
if ($number->isNegative()) {
return $this->add(
$number->getIntegerPart(),
'0'
);
}
return $this->add(
$number->getIntegerPart(),
$number->getIntegerRoundingMultiplier()
);
}
if (Money::ROUND_HALF_NEGATIVE_INFINITY === $roundingMode) {
if ($number->isNegative()) {
return $this->add(
$number->getIntegerPart(),
$number->getIntegerRoundingMultiplier()
);
}
return $this->add(
$number->getIntegerPart(),
'0'
);
}
throw new \InvalidArgumentException('Unknown rounding mode');
}
/**
* @param $number
*
* @return string
*/
private function roundDigit(Number $number)
{
if ($number->isCloserToNext()) {
return $this->add(
$number->getIntegerPart(),
$number->getIntegerRoundingMultiplier()
);
}
return $this->add($number->getIntegerPart(), '0');
}
/**
* {@inheritdoc}
*/
public function share($amount, $ratio, $total)
{
return $this->floor($this->divide($this->multiply($amount, $ratio), $total));
}
/**
* {@inheritdoc}
*/
public function mod($amount, $divisor)
{
// gmp_mod() only calculates non-negative integers, so we use absolutes
$remainder = gmp_mod($this->absolute($amount), $this->absolute($divisor));
// If the amount was negative, we negate the result of the modulus operation
$amount = Number::fromNumber($amount);
if ($amount->isNegative()) {
$remainder = gmp_neg($remainder);
}
return gmp_strval($remainder);
}
/**
* @test
*/
public function it_divides_bug538()
{
$this->assertSame('-4.54545454545455', $this->getCalculator()->divide('-500', 110));
}
}