function NativeCalculator::divQR

Overrides Calculator::divQR

File

vendor/brick/math/src/Internal/Calculator/NativeCalculator.php, line 129

Class

NativeCalculator

Calculator implementation using only native PHP code.

Namespace

Brick\Math\Internal\Calculator

Code

public function divQR(string $a, string $b) : array {
    if ($a === '0') {
        return [
            '0',
            '0',
        ];
    }
    if ($a === $b) {
        return [
            '1',
            '0',
        ];
    }
    if ($b === '1') {
        return [
            $a,
            '0',
        ];
    }
    if ($b === '-1') {
        return [
            $this->neg($a),
            '0',
        ];
    }
    
    /** @psalm-var numeric-string $a */
    $na = $a * 1;
    // cast to number
    if (is_int($na)) {
        
        /** @psalm-var numeric-string $b */
        $nb = $b * 1;
        if (is_int($nb)) {
            // the only division that may overflow is PHP_INT_MIN / -1,
            // which cannot happen here as we've already handled a divisor of -1 above.
            $q = intdiv($na, $nb);
            $r = $na % $nb;
            return [
                (string) $q,
                (string) $r,
            ];
        }
    }
    [
        $aNeg,
        $bNeg,
        $aDig,
        $bDig,
    ] = $this->init($a, $b);
    [
        $q,
        $r,
    ] = $this->doDiv($aDig, $bDig);
    if ($aNeg !== $bNeg) {
        $q = $this->neg($q);
    }
    if ($aNeg) {
        $r = $this->neg($r);
    }
    return [
        $q,
        $r,
    ];
}