관리-도구
편집 파일: Floats.php
<?php /** * This file is part of the Nette Framework (https://nette.org) * Copyright (c) 2004 David Grudl (https://davidgrudl.com) */ declare(strict_types=1); namespace Nette\Utils; use Nette; /** * Floating-point numbers comparison. */ class Floats { use Nette\StaticClass; private const Epsilon = 1e-10; public static function isZero(float $value): bool { return abs($value) < self::Epsilon; } public static function isInteger(float $value): bool { return abs(round($value) - $value) < self::Epsilon; } /** * Compare two floats. If $a < $b it returns -1, if they are equal it returns 0 and if $a > $b it returns 1 * @throws \LogicException if one of parameters is NAN */ public static function compare(float $a, float $b): int { if (is_nan($a) || is_nan($b)) { throw new \LogicException('Trying to compare NAN'); } elseif (!is_finite($a) && !is_finite($b) && $a === $b) { return 0; } $diff = abs($a - $b); if (($diff < self::Epsilon || ($diff / max(abs($a), abs($b)) < self::Epsilon))) { return 0; } return $a < $b ? -1 : 1; } /** * Returns true if $a = $b * @throws \LogicException if one of parameters is NAN */ public static function areEqual(float $a, float $b): bool { return self::compare($a, $b) === 0; } /** * Returns true if $a < $b * @throws \LogicException if one of parameters is NAN */ public static function isLessThan(float $a, float $b): bool { return self::compare($a, $b) < 0; } /** * Returns true if $a <= $b * @throws \LogicException if one of parameters is NAN */ public static function isLessThanOrEqualTo(float $a, float $b): bool { return self::compare($a, $b) <= 0; } /** * Returns true if $a > $b * @throws \LogicException if one of parameters is NAN */ public static function isGreaterThan(float $a, float $b): bool { return self::compare($a, $b) > 0; } /** * Returns true if $a >= $b * @throws \LogicException if one of parameters is NAN */ public static function isGreaterThanOrEqualTo(float $a, float $b): bool { return self::compare($a, $b) >= 0; } }