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<?php |
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namespace Aeq\LargestRemainder\Math; |
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use Aeq\LargestRemainder\Exception\AlreadyNormalizedException; |
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use Aeq\LargestRemainder\Exception\NotANumberException; |
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use Aeq\LargestRemainder\Exception\NotYetNormalizedException; |
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use Aeq\LargestRemainder\Math\Number as LargestRemainderNumber; |
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class LargestRemainder |
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{ |
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/** |
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* @var array |
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*/ |
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private $numbers = []; |
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/** |
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* @var int |
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*/ |
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private $precision = 0; |
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/** |
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* @param array $numbers |
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*/ |
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public function __construct(array $numbers) |
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{ |
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$this->numbers = $numbers; |
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} |
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/** |
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* @param int $precision |
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*/ |
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public function setPrecision(int $precision): void |
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{ |
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$this->precision = $precision; |
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} |
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/** |
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* @return array |
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* @throws AlreadyNormalizedException |
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* @throws NotANumberException |
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* @throws NotYetNormalizedException |
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*/ |
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public function round(): array |
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{ |
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return $this->uround( |
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function ($item) { |
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return $item; |
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}, |
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function (&$item, $value) { |
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$item = $value; |
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} |
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); |
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} |
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/** |
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* @param callable $get |
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* @param callable $set |
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* @return array |
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* @throws NotANumberException |
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* @throws AlreadyNormalizedException |
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* @throws NotYetNormalizedException |
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*/ |
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public function uround(callable $get, callable $set): array |
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{ |
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$originalOrder = array_keys($this->numbers); |
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$sum = array_sum(array_map(function ($item) use ($get) { |
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return $this->getNumber($get, $item)->floor()->value(); |
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}, $this->numbers)); |
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$diff = 100 - $sum; |
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uasort($this->numbers, function ($a, $b) use ($get) { |
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$aNumber = $this->getNumber($get, $a); |
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$bNumber = $this->getNumber($get, $b); |
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return $aNumber->value() - $aNumber->floor()->value() < $bNumber->value() - $bNumber->floor()->value(); |
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}); |
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$index = 0; |
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foreach ($this->numbers as &$item) { |
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$number = $this->getNumber($get, $item); |
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if ($index < $diff) { |
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$this->setNumber($set, $item, $number->add(1)->floor()); |
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$index++; |
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continue; |
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} |
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if ($diff < 0 && $index < $diff * (-1)) { |
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$this->setNumber($set, $item, $number->sub(1)->floor()); |
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$index++; |
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continue; |
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} |
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$this->setNumber($set, $item, $number->floor()); |
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$index++; |
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continue; |
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} |
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return array_replace(array_flip($originalOrder), $this->numbers); |
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} |
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/** |
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* @param callable $get |
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* @param $val |
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* @return LargestRemainderNumber |
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* @throws NotANumberException |
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* @throws AlreadyNormalizedException |
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*/ |
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private function getNumber(callable $get, $val): LargestRemainderNumber |
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{ |
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$resolved = call_user_func_array($get, [$val]); |
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if (false === is_numeric($resolved)) { |
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throw new NotANumberException($val, 1538927918); |
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} |
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return (new Number($resolved, $this->precision))->normalize(); |
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} |
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/** |
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* @param callable $set |
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* @param $item |
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* @param LargestRemainderNumber $number |
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* @throws NotYetNormalizedException |
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*/ |
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private function setNumber(callable $set, &$item, LargestRemainderNumber $number): void |
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{ |
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call_user_func_array($set, [&$item, $number->denormalize()->value()]); |
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} |
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} |
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kschu91 /
largest-remainder-method
