h

vendor/nette/utils/src/Utils/Floats.php

@@ -0,0 +1,107 @@
+<?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;
+	}
+}