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<?php
/**
* This script stress tests calculators with random large numbers and ensures that all implementations return the same
* results. It is designed to run in an infinite loop unless a bug is found.
*/
declare(strict_types=1);
require __DIR__ . '/vendor/autoload.php';
use Brick\Math\Internal\Calculator;
(new class(30) { // max digits
private readonly Calculator\GmpCalculator $gmp;
private readonly Calculator\BcMathCalculator $bcmath;
private readonly Calculator\NativeCalculator $native;
private int $testCounter = 0;
private float $lastOutputTime = 0.0;
private int $currentSecond = 0;
private int $currentSecondTestCounter = 0;
private int $testsPerSecond = 0;
public function __construct(
private readonly int $maxDigits,
) {
$this->gmp = new Calculator\GmpCalculator();
$this->bcmath = new Calculator\BcMathCalculator();
$this->native = new Calculator\NativeCalculator();
}
public function __invoke() : void
{
for (;;) {
$a = $this->generateRandomNumber();
$b = $this->generateRandomNumber();
$c = $this->generateRandomNumber();
$this->runTests($a, $b);
$this->runTests($b, $a);
if ($a !== '0') {
$this->runTests("-$a", $b);
$this->runTests($b, "-$a");
}
if ($b !== '0') {
$this->runTests($a, "-$b");
$this->runTests("-$b", $a);
}
if ($a !== '0' && $b !== '0') {
$this->runTests("-$a", "-$b");
$this->runTests("-$b", "-$a");
}
if ($c !== '0') {
$this->test("$a POW $b MOD $c", fn (Calculator $calc) => $calc->modPow($a, $b, $c));
}
}
}
/**
* @param string $a The left operand.
* @param string $b The right operand.
*/
private function runTests(string $a, string $b) : void
{
$this->test("$a + $b", fn (Calculator $c) => $c->add($a, $b));
$this->test("$a - $b", fn (Calculator $c) => $c->sub($a, $b));
$this->test("$a * $b", fn (Calculator $c) => $c->mul($a, $b));
if ($b !== '0') {
$this->test("$a / $b", fn (Calculator $c) => $c->divQR($a, $b));
$this->test("$a MOD $b", fn (Calculator $c) => $c->mod($a, $b));
}
if ($b !== '0' && $b[0] !== '-') {
$this->test("INV $a MOD $b", fn (Calculator $c) => $c->modInverse($a, $b));
}
$this->test("GCD $a, $b", fn (Calculator $c) => $c->gcd($a, $b));
if ($a[0] !== '-') {
$this->test("SQRT $a", fn (Calculator $c) => $c->sqrt($a));
}
$this->test("$a AND $b", fn (Calculator $c) => $c->and($a, $b));
$this->test("$a OR $b", fn (Calculator $c) => $c->or($a, $b));
$this->test("$a XOR $b", fn (Calculator $c) => $c->xor($a, $b));
}
/**
* @param string $test A string representing the test being executed.
* @param Closure(Calculator): mixed $callback A callback function accepting a Calculator instance and returning a calculation result.
*/
private function test(string $test, Closure $callback) : void
{
$gmpResult = $callback($this->gmp);
$bcmathResult = $callback($this->bcmath);
$nativeResult = $callback($this->native);
if ($gmpResult !== $bcmathResult) {
$this->failure('GMP', 'BCMath', $test);
}
if ($gmpResult !== $nativeResult) {
$this->failure('GMP', 'Native', $test);
}
$this->testCounter++;
$this->currentSecondTestCounter++;
$time = microtime(true);
$second = (int) $time;
if ($second !== $this->currentSecond) {
$this->currentSecond = $second;
$this->testsPerSecond = $this->currentSecondTestCounter;
$this->currentSecondTestCounter = 0;
}
if ($time - $this->lastOutputTime >= 0.1) {
echo "\r", number_format($this->testCounter), ' (', number_format($this->testsPerSecond) . ' / s)';
$this->lastOutputTime = $time;
}
}
/**
* @param string $c1 The name of the first calculator.
* @param string $c2 The name of the second calculator.
* @param string $test A string representing the test being executed.
*/
private function failure(string $c1, string $c2, string $test) : never
{
echo PHP_EOL;
echo 'FAILURE!', PHP_EOL;
echo $c1, ' vs ', $c2, PHP_EOL;
echo $test, PHP_EOL;
die;
}
private function generateRandomNumber() : string
{
$length = random_int(1, $this->maxDigits);
$number = '';
for ($i = 0; $i < $length; $i++) {
$number .= random_int(0, 9);
}
$number = ltrim($number, '0');
if ($number === '') {
return '0';
}
return $number;
}
})();
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