RoundingProvider::_roundLoopStart() - Code Metrics - Inspection of "Refactoring complexity" - JordanRL/Fermat - Measure and Improve Code Quality continuously with Scrutinizer

Passed
Pull Request — master (#134)

by Jordan
created 2022-10-12 13:17 UTC
RoundingProvider::_roundLoopStart() A

↳ Parent: RoundingProvider
Complexity

Conditions	5
Paths	6
Size

Total Lines	28
Code Lines	13
Duplication

Lines	0
Ratio	0 %
Code Coverage

Tests	11
CRAP Score	5
Importance

Changes	2
Bugs	0	Features	0
Metric	Value
cc	5
eloc	13
c	2
b	0
f	0
nc	6
nop	6
dl	0
loc	28
ccs	11
cts	11
cp	1
crap	5
rs	9.5222
<?php

namespace Samsara\Fermat\Provider;

use JetBrains\PhpStorm\ExpectedValues;
use JetBrains\PhpStorm\Pure;
use Samsara\Fermat\Enums\RandomMode;
use Samsara\Fermat\Enums\RoundingMode;
use Samsara\Fermat\Types\Base\Interfaces\Numbers\DecimalInterface;

/**
 *
 */
class RoundingProvider
{

    private static RoundingMode $mode = RoundingMode::HalfEven;
    private static bool $isNegative = false;
    private static int $alt = 1;
    private static ?string $remainder;

    /**
     * @param RoundingMode $mode
     * @return void
     */
    public static function setRoundingMode(
        RoundingMode $mode
    ): void
    {
        static::$mode = $mode;

    }

    /**
     * @return RoundingMode
     */
    public static function getRoundingMode(): RoundingMode
    {
        return self::$mode;
    }

    /**
     * @param string $decimal
     * @param int $places
     * @return string
     */
    public static function round(string $decimal, int $places = 0): string
    {
        $carry = 0;

        [
            $rawString,
            $roundedPart,
            $roundedPartString,
            $otherPart,
            $pos,
            $wholePart,
            $decimalPart,
            $currentPart
        ] = self::_roundPreFormat($decimal, $places);

        $sign = static::$isNegative ? '-' : '';

        $imaginary = str_ends_with($decimal, 'i') ? 'i' : '';

        if (empty($decimalPart) && $places >= 0) {
            return $sign.$rawString.$imaginary;
        }

        do {
            if (!array_key_exists($pos, $roundedPart)) {
            if (!array_key_exists($pos, /** @scrutinizer ignore-type */ $roundedPart)) {
                break;
            }

            [$digit, $nextDigit] = self::_roundLoopStart(
                $roundedPart,
                /** @scrutinizer ignore-type */ $roundedPart,
                $otherPart,
                /** @scrutinizer ignore-type */ $otherPart,
                $roundedPartString,
                $pos,
                $carry,
                $currentPart
            );

            if ($carry == 0) {
                $carry = match (self::getRoundingMode()) {
                    RoundingMode::HalfUp => self::roundHalfUp($digit),
                    RoundingMode::HalfDown => self::roundHalfDown($digit),
                    RoundingMode::HalfOdd => self::roundHalfOdd($digit, $nextDigit),
                    RoundingMode::HalfZero => self::roundHalfZero($digit),
                    RoundingMode::HalfInf => self::roundHalfInf($digit),
                    RoundingMode::Ceil => self::roundCeil($digit),
                    RoundingMode::Floor => self::roundFloor(),
                    RoundingMode::HalfRandom => self::roundRandom($digit),
                    RoundingMode::HalfAlternating => self::roundAlternating($digit),
                    RoundingMode::Stochastic => self::roundStochastic($digit),
                    default => self::roundHalfEven($digit, $nextDigit)
                };
            } else {
                if ($digit > 9) {
                    $carry = 1;
                    $roundedPart[$pos] = '0';
                } else {
                    $carry = 0;
                    $roundedPart[$pos] = $digit;
                }
            }

            [$roundedPart, $otherPart, $pos, $carry, $currentPart] = self::_roundLoopEnd(
                $roundedPart,
                /** @scrutinizer ignore-type */ $roundedPart,
                $otherPart,
                /** @scrutinizer ignore-type */ $otherPart,
                $pos,
                $carry,
                $currentPart
            );
        } while ($carry == 1);

        [$newWholePart, $newDecimalPart] = self::_roundPostFormat($currentPart, $wholePart, $roundedPart, $otherPart, $places);
        [$newWholePart, $newDecimalPart] = self::_roundPostFormat(/** @scrutinizer ignore-type */ $currentPart, $wholePart, $roundedPart, $otherPart, $places);

        static::$remainder = null;


        return $sign.$newWholePart.'.'.$newDecimalPart.$imaginary;
    }

    #[Pure]
    private static function nonHalfEarlyReturn(int $digit): int
    {
        return $digit <=> 5;
    }

    private static function negativeReverser(): int
    {
        if (static::$isNegative) {

            return 1;
        } else {
            return 0;
        }
    }

    private static function remainderCheck(): bool
    {
        $remainder = static::$remainder;


        if (is_null($remainder)) {
            return false;
        }

        $remainder = str_replace('0', '', $remainder);

        return !empty($remainder);
    }

    private static function roundHalfUp(int $digit): int
    {
        $negative = self::negativeReverser();
        $remainder = self::remainderCheck();

        if ($negative) {
            return $digit > 5 || ($digit == 5 && $remainder) ? 1 : 0;
        } else {
            return $digit > 4 ? 1 : 0;
        }
    }

    private static function roundHalfDown(int $digit): int
    {
        $negative = self::negativeReverser();
        $remainder = self::remainderCheck();

        if ($negative) {
            return $digit > 4 ? 1 : 0;
        } else {
            return $digit > 5 || ($digit == 5 && $remainder) ? 1 : 0;
        }
    }

    private static function roundHalfEven(int $digit, int $nextDigit): int
    {
        $early = static::nonHalfEarlyReturn($digit);
        $remainder = self::remainderCheck();

        if ($early == 0) {
            return ($nextDigit % 2 == 0 && !$remainder) ? 0 : 1;
        } else {
            return $early == 1 ? 1 : 0;
        }
    }

    private static function roundHalfOdd(int $digit, int $nextDigit): int
    {
        $early = static::nonHalfEarlyReturn($digit);
        $remainder = self::remainderCheck();

        if ($early == 0) {
            return ($nextDigit % 2 == 1 && !$remainder) ? 0 : 1;
        } else {
            return $early == 1 ? 1 : 0;
        }
    }

    private static function roundHalfZero(int $digit): int
    {
        $remainder = self::remainderCheck();

        return $digit > 5 || ($digit == 5 && $remainder) ? 1 : 0;
    }

    #[Pure]
    private static function roundHalfInf(int $digit): int
    {
        return $digit > 4 ? 1 : 0;
    }

    #[Pure]
    private static function roundCeil(int $digit): int
    {
        return $digit == 0 ? 0 : 1;
    }

    #[Pure]
    private static function roundFloor(): int
    {
        return 0;
    }

    private static function roundRandom(int $digit): int
    {
        $early = static::nonHalfEarlyReturn($digit);
        $remainder = self::remainderCheck();

        if ($early == 0 && !$remainder) {
            return RandomProvider::randomInt(0, 1, RandomMode::Speed)->asInt();
        } else {
            return (($early == 1 || $remainder) ? 1 : 0);
        }
    }

    private static function roundAlternating(int $digit): int
    {
        $early = static::nonHalfEarlyReturn($digit);
        $remainder = self::remainderCheck();

        if ($early == 0 && !$remainder) {
            $val = self::$alt;
            self::$alt = (int)!$val;

            return $val;
        } else {
            return (($early == 1 || $remainder) ? 1 : 0);
        }
    }

    private static function roundStochastic(int $digit): int
    {
        $remainder = static::$remainder;


        if (is_null($remainder)) {
            $target = $digit;
            $rangeMin = 0;
            $rangeMax = 9;
        } else {
            $remainder = substr($remainder, 0, 3);
            $target = (int)($digit.$remainder);
            $rangeMin = 0;
            $rangeMax = (int)str_repeat('9', strlen($remainder) + 1);
        }

        $random = RandomProvider::randomInt($rangeMin, $rangeMax, RandomMode::Speed)->asInt();

        if ($random < $target) {
            return 1;
        } else {
            return 0;
        }
    }

    private static function _roundPreFormat(string $decimal, int $places): array
    {
        $decimal = trim(rtrim($decimal));

        static::$isNegative = str_starts_with($decimal, '-');


        $rawString = str_replace('-', '', $decimal);

        if (str_contains($rawString, '.')) {
            [$wholePart, $decimalPart] = explode('.', $rawString);
        } else {
            $wholePart = $rawString;
            $decimalPart = '';
        }

        $absPlaces = abs($places);

        $currentPart = $places >= 0;
        $roundedPart = $currentPart ? str_split($decimalPart) : str_split($wholePart);
        $roundedPartString = $currentPart ? $decimalPart : $wholePart;
        $otherPart = $currentPart ? str_split($wholePart) : str_split($decimalPart);
        $baseLength = $currentPart ? strlen($decimalPart)-1 : strlen($wholePart);
        $pos = $currentPart ? $places : $baseLength + $places;

        if ($currentPart) {
            $pos = ($absPlaces > $baseLength && $places < 0) ? $baseLength : $pos;
        } else {
            $pos = ($absPlaces >= $baseLength) ? 0 : $pos;
        }

        return [
            $rawString,
            $roundedPart,
            $roundedPartString,
            $otherPart,
            $pos,
            $wholePart,
            $decimalPart,
            $currentPart
        ];
    }

    private static function _roundPostFormat(
        string $currentPart,
        string $wholePart,
        array $roundedPart,
        array $otherPart,
        int $places
    ): array
    {
        if ($currentPart) {
            $newDecimalPart = implode('', $roundedPart);
            $newWholePart = implode('', $otherPart);
        } else {
            $newDecimalPart = implode('', $otherPart);
            $newWholePart = implode('', $roundedPart);
        }

        if ($places > 0) {
            $newDecimalPart = substr($newDecimalPart, 0, $places);
        } elseif ($places == 0) {
            $newDecimalPart = '0';
        } else {
            $newWholePart = substr($newWholePart, 0, strlen($wholePart)+$places).str_repeat('0', $places*-1);
            $newDecimalPart = '0';
        }

        if (!strlen(str_replace('0', '', $newDecimalPart))) {
            $newDecimalPart = '0';
        }

        return [$newWholePart, $newDecimalPart];
    }

    private static function _roundLoopStart(
        array $roundedPart,
        array $otherPart,
        string $roundedPartString,
        int $pos,
        int $carry,
        bool $currentPart
    ): array
    {
        $digit = (int)$roundedPart[$pos] + $carry;

        if ($carry == 0 && $digit == 5) {
            static::$remainder = substr($roundedPartString, $pos+1);

        } else {
            static::$remainder = null;
        }

        if ($pos == 0) {
            if ($currentPart) {
                $nextDigit = (int)$otherPart[count($otherPart)-1];
            } else {
                $nextDigit = 0;
            }
        } else {
            $nextDigit = (int)$roundedPart[$pos-1];
        }

        return [$digit, $nextDigit];
    }

    private static function _roundLoopEnd(
        array $roundedPart,
        array $otherPart,
        int $pos,
        int $carry,
        bool $currentPart
    ): array
    {
        if ($pos == 0 && $carry == 1) {
            if ($currentPart) {
                $currentPart = false;

                // Do the variable swap dance
                $temp = $otherPart;
                $otherPart = $roundedPart;
                $roundedPart = $temp;

                $pos = count($roundedPart)-1;
            } else {
                array_unshift($roundedPart, $carry);
                $carry = 0;
            }
        } else {
            $pos -= 1;
        }

        return [$roundedPart, $otherPart, $pos, $carry, $currentPart];
    }

}
JordanRL / Fermat

Pull Request — master (#134)

RoundingProvider::_roundLoopStart() A

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