<?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;
use function abs, is_finite, is_nan, max, round;
/**
* 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;
}
}
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