BcMathCalculator.php
244 lines
| 1 | <?php |
| 2 | |
| 3 | namespace Money\Calculator; |
| 4 | |
| 5 | use Money\Calculator; |
| 6 | use Money\Money; |
| 7 | use Money\Number; |
| 8 | |
| 9 | /** |
| 10 | * @author Frederik Bosch <f.bosch@genkgo.nl> |
| 11 | */ |
| 12 | final class BcMathCalculator implements Calculator |
| 13 | { |
| 14 | /** |
| 15 | * @var string |
| 16 | */ |
| 17 | private $scale; |
| 18 | |
| 19 | /** |
| 20 | * @param int $scale |
| 21 | */ |
| 22 | public function __construct($scale = 14) |
| 23 | { |
| 24 | $this->scale = $scale; |
| 25 | } |
| 26 | |
| 27 | /** |
| 28 | * {@inheritdoc} |
| 29 | */ |
| 30 | public static function supported() |
| 31 | { |
| 32 | return extension_loaded('bcmath'); |
| 33 | } |
| 34 | |
| 35 | /** |
| 36 | * {@inheritdoc} |
| 37 | */ |
| 38 | public function compare($a, $b) |
| 39 | { |
| 40 | return bccomp($a, $b, $this->scale); |
| 41 | } |
| 42 | |
| 43 | /** |
| 44 | * {@inheritdoc} |
| 45 | */ |
| 46 | public function add($amount, $addend) |
| 47 | { |
| 48 | return (string) Number::fromString(bcadd($amount, $addend, $this->scale)); |
| 49 | } |
| 50 | |
| 51 | /** |
| 52 | * {@inheritdoc} |
| 53 | * |
| 54 | * @param $amount |
| 55 | * @param $subtrahend |
| 56 | * |
| 57 | * @return string |
| 58 | */ |
| 59 | public function subtract($amount, $subtrahend) |
| 60 | { |
| 61 | return (string) Number::fromString(bcsub($amount, $subtrahend, $this->scale)); |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * {@inheritdoc} |
| 66 | */ |
| 67 | public function multiply($amount, $multiplier) |
| 68 | { |
| 69 | $multiplier = Number::fromNumber($multiplier); |
| 70 | |
| 71 | return bcmul($amount, (string) $multiplier, $this->scale); |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * {@inheritdoc} |
| 76 | */ |
| 77 | public function divide($amount, $divisor) |
| 78 | { |
| 79 | $divisor = Number::fromNumber($divisor); |
| 80 | |
| 81 | return bcdiv($amount, (string) $divisor, $this->scale); |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * {@inheritdoc} |
| 86 | */ |
| 87 | public function ceil($number) |
| 88 | { |
| 89 | $number = Number::fromNumber($number); |
| 90 | |
| 91 | if ($number->isInteger()) { |
| 92 | return (string) $number; |
| 93 | } |
| 94 | |
| 95 | if ($number->isNegative()) { |
| 96 | return bcadd((string) $number, '0', 0); |
| 97 | } |
| 98 | |
| 99 | return bcadd((string) $number, '1', 0); |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * {@inheritdoc} |
| 104 | */ |
| 105 | public function floor($number) |
| 106 | { |
| 107 | $number = Number::fromNumber($number); |
| 108 | |
| 109 | if ($number->isInteger()) { |
| 110 | return (string) $number; |
| 111 | } |
| 112 | |
| 113 | if ($number->isNegative()) { |
| 114 | return bcadd((string) $number, '-1', 0); |
| 115 | } |
| 116 | |
| 117 | return bcadd($number, '0', 0); |
| 118 | } |
| 119 | |
| 120 | /** |
| 121 | * {@inheritdoc} |
| 122 | */ |
| 123 | public function absolute($number) |
| 124 | { |
| 125 | return ltrim($number, '-'); |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * {@inheritdoc} |
| 130 | */ |
| 131 | public function round($number, $roundingMode) |
| 132 | { |
| 133 | $number = Number::fromNumber($number); |
| 134 | |
| 135 | if ($number->isInteger()) { |
| 136 | return (string) $number; |
| 137 | } |
| 138 | |
| 139 | if ($number->isHalf() === false) { |
| 140 | return $this->roundDigit($number); |
| 141 | } |
| 142 | |
| 143 | if (Money::ROUND_HALF_UP === $roundingMode) { |
| 144 | return bcadd( |
| 145 | (string) $number, |
| 146 | $number->getIntegerRoundingMultiplier(), |
| 147 | 0 |
| 148 | ); |
| 149 | } |
| 150 | |
| 151 | if (Money::ROUND_HALF_DOWN === $roundingMode) { |
| 152 | return bcadd((string) $number, '0', 0); |
| 153 | } |
| 154 | |
| 155 | if (Money::ROUND_HALF_EVEN === $roundingMode) { |
| 156 | if ($number->isCurrentEven()) { |
| 157 | return bcadd((string) $number, '0', 0); |
| 158 | } |
| 159 | |
| 160 | return bcadd( |
| 161 | (string) $number, |
| 162 | $number->getIntegerRoundingMultiplier(), |
| 163 | 0 |
| 164 | ); |
| 165 | } |
| 166 | |
| 167 | if (Money::ROUND_HALF_ODD === $roundingMode) { |
| 168 | if ($number->isCurrentEven()) { |
| 169 | return bcadd( |
| 170 | (string) $number, |
| 171 | $number->getIntegerRoundingMultiplier(), |
| 172 | 0 |
| 173 | ); |
| 174 | } |
| 175 | |
| 176 | return bcadd((string) $number, '0', 0); |
| 177 | } |
| 178 | |
| 179 | if (Money::ROUND_HALF_POSITIVE_INFINITY === $roundingMode) { |
| 180 | if ($number->isNegative()) { |
| 181 | return bcadd((string) $number, '0', 0); |
| 182 | } |
| 183 | |
| 184 | return bcadd( |
| 185 | (string) $number, |
| 186 | $number->getIntegerRoundingMultiplier(), |
| 187 | 0 |
| 188 | ); |
| 189 | } |
| 190 | |
| 191 | if (Money::ROUND_HALF_NEGATIVE_INFINITY === $roundingMode) { |
| 192 | if ($number->isNegative()) { |
| 193 | return bcadd( |
| 194 | (string) $number, |
| 195 | $number->getIntegerRoundingMultiplier(), |
| 196 | 0 |
| 197 | ); |
| 198 | } |
| 199 | |
| 200 | return bcadd( |
| 201 | (string) $number, |
| 202 | '0', |
| 203 | 0 |
| 204 | ); |
| 205 | } |
| 206 | |
| 207 | throw new \InvalidArgumentException('Unknown rounding mode'); |
| 208 | } |
| 209 | |
| 210 | /** |
| 211 | * @param $number |
| 212 | * |
| 213 | * @return string |
| 214 | */ |
| 215 | private function roundDigit(Number $number) |
| 216 | { |
| 217 | if ($number->isCloserToNext()) { |
| 218 | return bcadd( |
| 219 | (string) $number, |
| 220 | $number->getIntegerRoundingMultiplier(), |
| 221 | 0 |
| 222 | ); |
| 223 | } |
| 224 | |
| 225 | return bcadd((string) $number, '0', 0); |
| 226 | } |
| 227 | |
| 228 | /** |
| 229 | * {@inheritdoc} |
| 230 | */ |
| 231 | public function share($amount, $ratio, $total) |
| 232 | { |
| 233 | return $this->floor(bcdiv(bcmul($amount, $ratio, $this->scale), $total, $this->scale)); |
| 234 | } |
| 235 | |
| 236 | /** |
| 237 | * {@inheritdoc} |
| 238 | */ |
| 239 | public function mod($amount, $divisor) |
| 240 | { |
| 241 | return bcmod($amount, $divisor); |
| 242 | } |
| 243 | } |
| 244 |