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<?php |
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|
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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 Packetery\Nette\Utils; |
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|
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use Packetery\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 \Packetery\Nette\StaticClass; |
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private const Epsilon = 1.0E-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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} |
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|
