<?php

> 


/**
 * SCSSPHP
 *

<  * @copyright 2012-2019 Leaf Corcoran



>  * @copyright 2012-2020 Leaf Corcoran


 *
 * @license http://opensource.org/licenses/MIT MIT
 *
 * @link http://scssphp.github.io/scssphp
 */

namespace ScssPhp\ScssPhp\Node;


> use ScssPhp\ScssPhp\Base\Range;


use ScssPhp\ScssPhp\Compiler;

> use ScssPhp\ScssPhp\Exception\RangeException;
use ScssPhp\ScssPhp\Node;
> use ScssPhp\ScssPhp\Exception\SassScriptException;


use ScssPhp\ScssPhp\Type;

> use ScssPhp\ScssPhp\Util;



/**
 * Dimension + optional units
 *
 * {@internal
 *     This is a work-in-progress.
 *
 *     The \ArrayAccess interface is temporary until the migration is complete.
 * }}
 *
 * @author Anthon Pang <anthon.pang@gmail.com>

>  *
 */
>  * @template-implements \ArrayAccess<int, mixed>


class Number extends Node implements \ArrayAccess
{

>     const PRECISION = 10;
    /**
> 



<      * @var integer



>      * @var int
>      * @deprecated use {Number::PRECISION} instead to read the precision. Configuring it is not supported anymore.


     */

<     static public $precision = 10;



>     public static $precision = self::PRECISION;



    /**
     * @see http://www.w3.org/TR/2012/WD-css3-values-20120308/
     *
     * @var array

>      * @phpstan-var array<string, array<string, float|int>>


     */

<     static protected $unitTable = [



>     protected static $unitTable = [


        'in' => [
            'in' => 1,
            'pc' => 6,
            'pt' => 72,
            'px' => 96,
            'cm' => 2.54,
            'mm' => 25.4,
            'q'  => 101.6,
        ],
        'turn' => [
            'deg'  => 360,
            'grad' => 400,
            'rad'  => 6.28318530717958647692528676, // 2 * M_PI
            'turn' => 1,
        ],
        's' => [
            's'  => 1,
            'ms' => 1000,
        ],
        'Hz' => [
            'Hz'  => 1,
            'kHz' => 0.001,
        ],
        'dpi' => [
            'dpi'  => 1,

<             'dpcm' => 2.54,
<             'dppx' => 96,



>             'dpcm' => 1 / 2.54,
>             'dppx' => 1 / 96,


        ],
    ];

    /**

<      * @var integer|float



>      * @var int|float


     */

<     public $dimension;



>     private $dimension;



    /**

<      * @var array



>      * @var string[]
>      * @phpstan-var list<string>
>      */
>     private $numeratorUnits;
> 
>     /**
>      * @var string[]
>      * @phpstan-var list<string>


     */

<     public $units;



>     private $denominatorUnits;



    /**
     * Initialize number
     *

<      * @param mixed $dimension
<      * @param mixed $initialUnit
<      */
<     public function __construct($dimension, $initialUnit)
<     {
<         $this->type      = Type::T_NUMBER;



>      * @param int|float       $dimension
>      * @param string[]|string $numeratorUnits
>      * @param string[]        $denominatorUnits
>      *
>      * @phpstan-param list<string>|string $numeratorUnits
>      * @phpstan-param list<string>        $denominatorUnits
>      */
>     public function __construct($dimension, $numeratorUnits, array $denominatorUnits = [])
>     {
>         if (is_string($numeratorUnits)) {
>             $numeratorUnits = $numeratorUnits ? [$numeratorUnits] : [];
>         } elseif (isset($numeratorUnits['numerator_units'], $numeratorUnits['denominator_units'])) {
>             // TODO get rid of this once `$number[2]` is not used anymore
>             $denominatorUnits = $numeratorUnits['denominator_units'];
>             $numeratorUnits = $numeratorUnits['numerator_units'];
>         }
> 


        $this->dimension = $dimension;

<         $this->units     = is_array($initialUnit)
<             ? $initialUnit
<             : ($initialUnit ? [$initialUnit => 1]
<                             : []);



>         $this->numeratorUnits = $numeratorUnits;
>         $this->denominatorUnits = $denominatorUnits;


    }

    /**

<      * Coerce number to target units
<      *
<      * @param array $units
<      *
<      * @return \ScssPhp\ScssPhp\Node\Number



>      * @return float|int


     */

<     public function coerce($units)



>     public function getDimension()


    {

<         if ($this->unitless()) {
<             return new Number($this->dimension, $units);
<         }
< 
<         $dimension = $this->dimension;
< 
<         foreach (static::$unitTable['in'] as $unit => $conv) {
<             $from       = isset($this->units[$unit]) ? $this->units[$unit] : 0;
<             $to         = isset($units[$unit]) ? $units[$unit] : 0;
<             $factor     = pow($conv, $from - $to);
<             $dimension /= $factor;



>         return $this->dimension;


        }


<         return new Number($dimension, $units);



>     /**
>      * @return string[]
>      */
>     public function getNumeratorUnits()
>     {
>         return $this->numeratorUnits;


    }

    /**

<      * Normalize number
<      *
<      * @return \ScssPhp\ScssPhp\Node\Number



>      * @return string[]


     */

<     public function normalize()



>     public function getDenominatorUnits()


    {

<         $dimension = $this->dimension;
<         $units     = [];
< 
<         $this->normalizeUnits($dimension, $units, 'in');
< 
<         return new Number($dimension, $units);



>         return $this->denominatorUnits;


    }

    /**

<      * {@inheritdoc}



>      * @return bool


     */

>     #[\ReturnTypeWillChange]


    public function offsetExists($offset)
    {
        if ($offset === -3) {

<             return ! is_null($this->sourceColumn);



>             return ! \is_null($this->sourceColumn);


        }

        if ($offset === -2) {

<             return ! is_null($this->sourceLine);



>             return ! \is_null($this->sourceLine);


        }


<         if ($offset === -1 ||



>         if (
>             $offset === -1 ||


            $offset === 0 ||
            $offset === 1 ||
            $offset === 2
        ) {
            return true;
        }

        return false;
    }

    /**

<      * {@inheritdoc}



>      * @return mixed


     */

>     #[\ReturnTypeWillChange]


    public function offsetGet($offset)
    {
        switch ($offset) {
            case -3:
                return $this->sourceColumn;

            case -2:
                return $this->sourceLine;

            case -1:
                return $this->sourceIndex;

            case 0:

<                 return $this->type;



>                 return Type::T_NUMBER;



            case 1:
                return $this->dimension;

            case 2:

<                 return $this->units;



>                 return array('numerator_units' => $this->numeratorUnits, 'denominator_units' => $this->denominatorUnits);


        }
    }

    /**

<      * {@inheritdoc}



>      * @return void


     */

>     #[\ReturnTypeWillChange]


    public function offsetSet($offset, $value)
    {

<         if ($offset === 1) {
<             $this->dimension = $value;
<         } elseif ($offset === 2) {
<             $this->units = $value;
<         } elseif ($offset == -1) {
<             $this->sourceIndex = $value;
<         } elseif ($offset == -2) {
<             $this->sourceLine = $value;
<         } elseif ($offset == -3) {
<             $this->sourceColumn = $value;
<         }



>         throw new \BadMethodCallException('Number is immutable');


    }

    /**

<      * {@inheritdoc}



>      * @return void


     */

>     #[\ReturnTypeWillChange]


    public function offsetUnset($offset)
    {

<         if ($offset === 1) {
<             $this->dimension = null;
<         } elseif ($offset === 2) {
<             $this->units = null;
<         } elseif ($offset === -1) {
<             $this->sourceIndex = null;
<         } elseif ($offset === -2) {
<             $this->sourceLine = null;
<         } elseif ($offset === -3) {
<             $this->sourceColumn = null;
<         }



>         throw new \BadMethodCallException('Number is immutable');


    }

    /**
     * Returns true if the number is unitless
     *

<      * @return boolean



>      * @return bool


     */
    public function unitless()
    {

<         return ! array_sum($this->units);



>         return \count($this->numeratorUnits) === 0 && \count($this->denominatorUnits) === 0;
>     }
> 
>     /**
>      * Returns true if the number has any units
>      *
>      * @return bool
>      */
>     public function hasUnits()
>     {
>         return !$this->unitless();
>     }
> 
>     /**
>      * Checks whether the number has exactly this unit
>      *
>      * @param string $unit
>      *
>      * @return bool
>      */
>     public function hasUnit($unit)
>     {
>         return \count($this->numeratorUnits) === 1 && \count($this->denominatorUnits) === 0 && $this->numeratorUnits[0] === $unit;


    }

    /**
     * Returns unit(s) as the product of numerator units divided by the product of denominator units
     *
     * @return string
     */
    public function unitStr()
    {

<         $numerators   = [];
<         $denominators = [];



>         if ($this->unitless()) {
>             return '';
>         }




<         foreach ($this->units as $unit => $unitSize) {
<             if ($unitSize > 0) {
<                 $numerators = array_pad($numerators, count($numerators) + $unitSize, $unit);
<                 continue;



>         return self::getUnitString($this->numeratorUnits, $this->denominatorUnits);


            }


<             if ($unitSize < 0) {
<                 $denominators = array_pad($denominators, count($denominators) + $unitSize, $unit);
<                 continue;



>     /**
>      * @param float|int $min
>      * @param float|int $max
>      * @param string|null $name
>      *
>      * @return float|int
>      * @throws SassScriptException
>      */
>     public function valueInRange($min, $max, $name = null)
>     {
>         try {
>             return Util::checkRange('', new Range($min, $max), $this);
>         } catch (RangeException $e) {
>             throw SassScriptException::forArgument(sprintf('Expected %s to be within %s%s and %s%3$s.', $this, $min, $this->unitStr(), $max), $name);
>         }
>     }
> 
>     /**
>      * @param float|int $min
>      * @param float|int $max
>      * @param string    $name
>      * @param string    $unit
>      *
>      * @return float|int
>      * @throws SassScriptException
>      *
>      * @internal
>      */
>     public function valueInRangeWithUnit($min, $max, $name, $unit)
>     {
>         try {
>             return Util::checkRange('', new Range($min, $max), $this);
>         } catch (RangeException $e) {
>             throw SassScriptException::forArgument(sprintf('Expected %s to be within %s%s and %s%3$s.', $this, $min, $unit, $max), $name);
>         }
>     }
> 
>     /**
>      * @param string|null $varName
>      *
>      * @return void
>      */
>     public function assertNoUnits($varName = null)
>     {
>         if ($this->unitless()) {
>             return;
>         }
> 
>         throw SassScriptException::forArgument(sprintf('Expected %s to have no units.', $this), $varName);
>     }
> 
>     /**
>      * @param string      $unit
>      * @param string|null $varName
>      *
>      * @return void
>      */
>     public function assertUnit($unit, $varName = null)
>     {
>         if ($this->hasUnit($unit)) {
>             return;
>         }
> 
>         throw SassScriptException::forArgument(sprintf('Expected %s to have unit "%s".', $this, $unit), $varName);
>     }
> 
>     /**
>      * @param Number $other
>      *
>      * @return void
>      */
>     public function assertSameUnitOrUnitless(Number $other)
>     {
>         if ($other->unitless()) {
>             return;
>         }
> 
>         if ($this->numeratorUnits === $other->numeratorUnits && $this->denominatorUnits === $other->denominatorUnits) {
>             return;
>         }
> 
>         throw new SassScriptException(sprintf(
>             'Incompatible units %s and %s.',
>             self::getUnitString($this->numeratorUnits, $this->denominatorUnits),
>             self::getUnitString($other->numeratorUnits, $other->denominatorUnits)
>         ));
>     }
> 
>     /**
>      * Returns a copy of this number, converted to the units represented by $newNumeratorUnits and $newDenominatorUnits.
>      *
>      * This does not throw an error if this number is unitless and
>      * $newNumeratorUnits/$newDenominatorUnits are not empty, or vice versa. Instead,
>      * it treats all unitless numbers as convertible to and from all units without
>      * changing the value.
>      *
>      * @param string[] $newNumeratorUnits
>      * @param string[] $newDenominatorUnits
>      *
>      * @return Number
>      *
>      * @phpstan-param list<string> $newNumeratorUnits
>      * @phpstan-param list<string> $newDenominatorUnits
>      *
>      * @throws SassScriptException if this number's units are not compatible with $newNumeratorUnits and $newDenominatorUnits
>      */
>     public function coerce(array $newNumeratorUnits, array $newDenominatorUnits)
>     {
>         return new Number($this->valueInUnits($newNumeratorUnits, $newDenominatorUnits), $newNumeratorUnits, $newDenominatorUnits);
>     }
> 
>     /**
>      * @param Number $other
>      *
>      * @return bool
>      */
>     public function isComparableTo(Number $other)
>     {
>         if ($this->unitless() || $other->unitless()) {
>             return true;
>         }
> 
>         try {
>             $this->greaterThan($other);
>             return true;
>         } catch (SassScriptException $e) {
>             return false;
>         }
>     }
> 
>     /**
>      * @param Number $other
>      *
>      * @return bool
>      */
>     public function lessThan(Number $other)
>     {
>         return $this->coerceUnits($other, function ($num1, $num2) {
>             return $num1 < $num2;
>         });
>     }
> 
>     /**
>      * @param Number $other
>      *
>      * @return bool
>      */
>     public function lessThanOrEqual(Number $other)
>     {
>         return $this->coerceUnits($other, function ($num1, $num2) {
>             return $num1 <= $num2;
>         });
>     }
> 
>     /**
>      * @param Number $other
>      *
>      * @return bool
>      */
>     public function greaterThan(Number $other)
>     {
>         return $this->coerceUnits($other, function ($num1, $num2) {
>             return $num1 > $num2;
>         });
>     }
> 
>     /**
>      * @param Number $other
>      *
>      * @return bool
>      */
>     public function greaterThanOrEqual(Number $other)
>     {
>         return $this->coerceUnits($other, function ($num1, $num2) {
>             return $num1 >= $num2;
>         });
>     }
> 
>     /**
>      * @param Number $other
>      *
>      * @return Number
>      */
>     public function plus(Number $other)
>     {
>         return $this->coerceNumber($other, function ($num1, $num2) {
>             return $num1 + $num2;
>         });
>     }
> 
>     /**
>      * @param Number $other
>      *
>      * @return Number
>      */
>     public function minus(Number $other)
>     {
>         return $this->coerceNumber($other, function ($num1, $num2) {
>             return $num1 - $num2;
>         });
>     }
> 
>     /**
>      * @return Number
>      */
>     public function unaryMinus()
>     {
>         return new Number(-$this->dimension, $this->numeratorUnits, $this->denominatorUnits);
>     }
> 
>     /**
>      * @param Number $other
>      *
>      * @return Number
>      */
>     public function modulo(Number $other)
>     {
>         return $this->coerceNumber($other, function ($num1, $num2) {
>             if ($num2 == 0) {
>                 return NAN;
>             }
> 
>             $result = fmod($num1, $num2);
> 
>             if ($result == 0) {
>                 return 0;
>             }
> 
>             if ($num2 < 0 xor $num1 < 0) {
>                 $result += $num2;
>             }
> 
>             return $result;
>         });


            }

> 
        }
>     /**

>      * @param Number $other
        return implode('*', $numerators) . (count($denominators) ? '/' . implode('*', $denominators) : '');
>      *
    }
>      * @return Number

>      */
    /**
>     public function times(Number $other)
     * Output number
>     {
     *
>         return $this->multiplyUnits($this->dimension * $other->dimension, $this->numeratorUnits, $this->denominatorUnits, $other->numeratorUnits, $other->denominatorUnits);



<         return implode('*', $numerators) . (count($denominators) ? '/' . implode('*', $denominators) : '');



>     /**
>      * @param Number $other
>      *
>      * @return Number
>      */
>     public function dividedBy(Number $other)
>     {
>         if ($other->dimension == 0) {
>             if ($this->dimension == 0) {
>                 $value = NAN;
>             } elseif ($this->dimension > 0) {
>                 $value = INF;
>             } else {
>                 $value = -INF;
>             }
>         } else {
>             $value = $this->dimension / $other->dimension;
>         }
> 
>         return $this->multiplyUnits($value, $this->numeratorUnits, $this->denominatorUnits, $other->denominatorUnits, $other->numeratorUnits);
>     }
> 
>     /**
>      * @param Number $other
>      *
>      * @return bool
>      */
>     public function equals(Number $other)
>     {
>         // Unitless numbers are convertable to unit numbers, but not equal, so we special-case unitless here.
>         if ($this->unitless() !== $other->unitless()) {
>             return false;
>         }
> 
>         // In Sass, neither NaN nor Infinity are equal to themselves, while PHP defines INF==INF
>         if (is_nan($this->dimension) || is_nan($other->dimension) || !is_finite($this->dimension) || !is_finite($other->dimension)) {
>             return false;
>         }
> 
>         if ($this->unitless()) {
>             return round($this->dimension, self::PRECISION) == round($other->dimension, self::PRECISION);
>         }
> 
>         try {
>             return $this->coerceUnits($other, function ($num1, $num2) {
>                 return round($num1,self::PRECISION) == round($num2, self::PRECISION);
>             });
>         } catch (SassScriptException $e) {
>             return false;
>         }


     *
     * @return string
     */
    public function output(Compiler $compiler = null)
    {

<         $dimension = round($this->dimension, static::$precision);



>         $dimension = round($this->dimension, self::PRECISION);




<         $units = array_filter($this->units, function ($unitSize) {
<             return $unitSize;
<         });



>         if (is_nan($dimension)) {
>             return 'NaN';
>         }




<         if (count($units) > 1 && array_sum($units) === 0) {
<             $dimension = $this->dimension;
<             $units     = [];
< 
<             $this->normalizeUnits($dimension, $units, 'in');
< 
<             $dimension = round($dimension, static::$precision);
<             $units     = array_filter($units, function ($unitSize) {
<                 return $unitSize;
<             });



>         if ($dimension === INF) {
>             return 'Infinity';


        }


<         $unitSize = array_sum($units);



>         if ($dimension === -INF) {
>             return '-Infinity';
>         }




<         if ($compiler && ($unitSize > 1 || $unitSize < 0 || count($units) > 1)) {
<             $compiler->throwError((string) $dimension . $this->unitStr() . " isn't a valid CSS value.");



>         if ($compiler) {
>             $unit = $this->unitStr();
>         } elseif (isset($this->numeratorUnits[0])) {
>             $unit = $this->numeratorUnits[0];
>         } else {
>             $unit = '';


        }


<         reset($units);
<         $unit = key($units);
<         $dimension = number_format($dimension, static::$precision, '.', '');



>         $dimension = number_format($dimension, self::PRECISION, '.', '');




<         return (static::$precision ? rtrim(rtrim($dimension, '0'), '.') : $dimension) . $unit;



>         return rtrim(rtrim($dimension, '0'), '.') . $unit;


    }

    /**
     * {@inheritdoc}
     */
    public function __toString()
    {
        return $this->output();
    }

    /**

<      * Normalize units



>      * @param Number   $other
>      * @param callable $operation


     *

<      * @param integer|float $dimension
<      * @param array         $units
<      * @param string        $baseUnit



>      * @return Number
>      *
>      * @phpstan-param callable(int|float, int|float): (int|float) $operation


     */

<     private function normalizeUnits(&$dimension, &$units, $baseUnit = 'in')



>     private function coerceNumber(Number $other, $operation)


    {

<         $dimension = $this->dimension;
<         $units     = [];



>         $result = $this->coerceUnits($other, $operation);




<         foreach ($this->units as $unit => $exp) {
<             if (isset(static::$unitTable[$baseUnit][$unit])) {
<                 $factor = pow(static::$unitTable[$baseUnit][$unit], $exp);



>         if (!$this->unitless()) {
>             return new Number($result, $this->numeratorUnits, $this->denominatorUnits);
>         }




<                 $unit = $baseUnit;
<                 $dimension /= $factor;



>         return new Number($result, $other->numeratorUnits, $other->denominatorUnits);


            }


<             $units[$unit] = $exp + (isset($units[$unit]) ? $units[$unit] : 0);



>     /**
>      * @param Number $other
>      * @param callable $operation
>      *
>      * @return mixed
>      *
>      * @phpstan-template T
>      * @phpstan-param callable(int|float, int|float): T $operation
>      * @phpstan-return T
>      */
>     private function coerceUnits(Number $other, $operation)
>     {
>         if (!$this->unitless()) {
>             $num1 = $this->dimension;
>             $num2 = $other->valueInUnits($this->numeratorUnits, $this->denominatorUnits);
>         } else {
>             $num1 = $this->valueInUnits($other->numeratorUnits, $other->denominatorUnits);
>             $num2 = $other->dimension;
>         }
> 
>         return \call_user_func($operation, $num1, $num2);
>     }
> 
>     /**
>      * @param string[] $numeratorUnits
>      * @param string[] $denominatorUnits
>      *
>      * @return int|float
>      *
>      * @phpstan-param list<string> $numeratorUnits
>      * @phpstan-param list<string> $denominatorUnits
>      *
>      * @throws SassScriptException if this number's units are not compatible with $numeratorUnits and $denominatorUnits
>      */
>     private function valueInUnits(array $numeratorUnits, array $denominatorUnits)
>     {
>         if (
>             $this->unitless()
>             || (\count($numeratorUnits) === 0 && \count($denominatorUnits) === 0)
>             || ($this->numeratorUnits === $numeratorUnits && $this->denominatorUnits === $denominatorUnits)
>         ) {
>             return $this->dimension;


        }

> 
    }
>         $value = $this->dimension;
}
>         $oldNumerators = $this->numeratorUnits;
> 
>         foreach ($numeratorUnits as $newNumerator) {
>             foreach ($oldNumerators as $key => $oldNumerator) {
>                 $conversionFactor = self::getConversionFactor($newNumerator, $oldNumerator);
> 
>                 if (\is_null($conversionFactor)) {
>                     continue;
>                 }
> 
>                 $value *= $conversionFactor;
>                 unset($oldNumerators[$key]);
>                 continue 2;
>             }
> 
>             throw new SassScriptException(sprintf(
>                 'Incompatible units %s and %s.',
>                 self::getUnitString($this->numeratorUnits, $this->denominatorUnits),
>                 self::getUnitString($numeratorUnits, $denominatorUnits)
>             ));
>         }
> 
>         $oldDenominators = $this->denominatorUnits;
> 
>         foreach ($denominatorUnits as $newDenominator) {
>             foreach ($oldDenominators as $key => $oldDenominator) {
>                 $conversionFactor = self::getConversionFactor($newDenominator, $oldDenominator);
> 
>                 if (\is_null($conversionFactor)) {
>                     continue;
>                 }
> 
>                 $value /= $conversionFactor;
>                 unset($oldDenominators[$key]);
>                 continue 2;
>             }
> 
>             throw new SassScriptException(sprintf(
>                 'Incompatible units %s and %s.',
>                 self::getUnitString($this->numeratorUnits, $this->denominatorUnits),
>                 self::getUnitString($numeratorUnits, $denominatorUnits)
>             ));
>         }
> 
>         if (\count($oldNumerators) || \count($oldDenominators)) {
>             throw new SassScriptException(sprintf(
>                 'Incompatible units %s and %s.',
>                 self::getUnitString($this->numeratorUnits, $this->denominatorUnits),
>                 self::getUnitString($numeratorUnits, $denominatorUnits)
>             ));
>         }
> 
>         return $value;
>     }
> 
>     /**
>      * @param int|float $value
>      * @param string[] $numerators1
>      * @param string[] $denominators1
>      * @param string[] $numerators2
>      * @param string[] $denominators2
>      *
>      * @return Number
>      *
>      * @phpstan-param list<string> $numerators1
>      * @phpstan-param list<string> $denominators1
>      * @phpstan-param list<string> $numerators2
>      * @phpstan-param list<string> $denominators2
>      */
>     private function multiplyUnits($value, array $numerators1, array $denominators1, array $numerators2, array $denominators2)
>     {
>         $newNumerators = array();
> 
>         foreach ($numerators1 as $numerator) {
>             foreach ($denominators2 as $key => $denominator) {
>                 $conversionFactor = self::getConversionFactor($numerator, $denominator);
> 
>                 if (\is_null($conversionFactor)) {
>                     continue;
>                 }
> 
>                 $value /= $conversionFactor;
>                 unset($denominators2[$key]);
>                 continue 2;
>             }
> 
>             $newNumerators[] = $numerator;
>         }
> 
>         foreach ($numerators2 as $numerator) {
>             foreach ($denominators1 as $key => $denominator) {
>                 $conversionFactor = self::getConversionFactor($numerator, $denominator);
> 
>                 if (\is_null($conversionFactor)) {
>                     continue;
>                 }
> 
>                 $value /= $conversionFactor;
>                 unset($denominators1[$key]);
>                 continue 2;
>             }
> 
>             $newNumerators[] = $numerator;
>         }
> 
>         $newDenominators = array_values(array_merge($denominators1, $denominators2));
> 
>         return new Number($value, $newNumerators, $newDenominators);
>     }
> 
>     /**
>      * Returns the number of [unit1]s per [unit2].
>      *
>      * Equivalently, `1unit1 * conversionFactor(unit1, unit2) = 1unit2`.
>      *
>      * @param string $unit1
>      * @param string $unit2
>      *
>      * @return float|int|null
>      */
>     private static function getConversionFactor($unit1, $unit2)
>     {
>         if ($unit1 === $unit2) {
>             return 1;
>         }
> 
>         foreach (static::$unitTable as $unitVariants) {
>             if (isset($unitVariants[$unit1]) && isset($unitVariants[$unit2])) {
>                 return $unitVariants[$unit1] / $unitVariants[$unit2];
>             }
>         }
> 
>         return null;
>     }
> 
>     /**
>      * Returns unit(s) as the product of numerator units divided by the product of denominator units
>      *
>      * @param string[] $numerators
>      * @param string[] $denominators
>      *
>      * @phpstan-param list<string> $numerators
>      * @phpstan-param list<string> $denominators
>      *
>      * @return string
>      */
>     private static function getUnitString(array $numerators, array $denominators)
>     {
>         if (!\count($numerators)) {
>             if (\count($denominators) === 0) {
>                 return 'no units';
>             }
> 
>             if (\count($denominators) === 1) {
>                 return $denominators[0] . '^-1';
>             }
> 
>             return '(' . implode('*', $denominators) . ')^-1';
>         }
> 
>         return implode('*', $numerators) . (\count($denominators) ? '/' . implode('*', $denominators) : '');