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