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<?php |
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declare(strict_types = 1); |
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namespace byrokrat\amount\Rounder; |
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/** |
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* Rounding helper methods |
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*/ |
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class Toolkit |
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{ |
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/** |
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* Check if value is positive |
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*/ |
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public function isPositive(string $value): bool |
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{ |
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return 1 == bccomp($value, '0', $this->parsePrecision($value)); |
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} |
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/** |
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* Check if value is even |
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*/ |
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public function isEven(string $value): bool |
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{ |
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return 0 == bcmod($value, '2'); |
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} |
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/** |
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* Extract the precision used in $value |
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*/ |
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public function parsePrecision(string $value): int |
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{ |
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if (strpos($value, '.') === false) { |
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return 0; |
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} |
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list(, $fraction) = explode('.', $value); |
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return strlen(rtrim($fraction, '0')); |
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} |
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/** |
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* Get one unit in the scale of $precision |
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*/ |
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public function getOneUnit(int $precision): string |
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{ |
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return bcdiv( |
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'1', |
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'1' . str_repeat('0', $precision), |
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$precision |
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); |
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} |
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/** |
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* Round value towards zero |
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*/ |
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public function roundTowardsZero(string $value, int $precision): string |
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{ |
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return bcadd($value, '0', $precision); |
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} |
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/** |
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* Round value away from zero |
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*/ |
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public function roundAwayFromZero(string $value, int $precision): string |
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{ |
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if ($this->parsePrecision($value) <= $precision) { |
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return $value; |
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} |
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if ($this->isPositive($value)) { |
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return $this->roundUp($value, $precision); |
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} |
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return $this->roundDown($value, $precision); |
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} |
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/** |
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* Round up value |
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*/ |
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44 |
View Code Duplication |
public function roundUp(string $value, int $precision): string |
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{ |
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if ($this->parsePrecision($value) <= $precision) { |
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return $value; |
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} |
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if ($this->isPositive($value)) { |
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return bcadd( |
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$this->roundTowardsZero($value, $precision), |
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$this->getOneUnit($precision), |
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$precision |
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); |
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} |
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return $this->roundTowardsZero($value, $precision); |
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} |
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/** |
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* Round down value |
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*/ |
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198 |
View Code Duplication |
public function roundDown(string $value, int $precision): string |
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{ |
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if ($this->parsePrecision($value) <= $precision) { |
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return $value; |
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} |
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if ($this->isPositive($value)) { |
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return $this->roundTowardsZero($value, $precision); |
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} |
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return bcsub( |
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$this->roundTowardsZero($value, $precision), |
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$this->getOneUnit($precision), |
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$precision |
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); |
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} |
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/** |
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* Get tiebreak value for round to nearest strategies |
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*/ |
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public function getTiebreak(string $value, int $precision): string |
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{ |
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return $this->roundTowardsZero($value, $precision) . ($precision > 0 ? '5' : '.5'); |
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} |
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/** |
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* Round to nearest using callback for breaking ties |
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*/ |
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public function roundToNearest(string $value, int $precision, callable $tiebreakCallback): string |
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{ |
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if ($this->parsePrecision($value) <= $precision) { |
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return $value; |
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} |
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switch (bccomp($value, $this->getTiebreak($value, $precision), $precision + 1)) { |
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case 1: |
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return $this->roundUp($value, $precision); |
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case -1: |
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return $this->roundDown($value, $precision); |
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default: |
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return $tiebreakCallback($value, $precision); |
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} |
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} |
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} |
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byrokrat /
amount
