friendship ended with social-app. php is my new best friend
veryroundbird.house
1<?php
2
3/**
4 * This file is part of the Nette Framework (https://nette.org)
5 * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
6 */
7
8declare(strict_types=1);
9
10namespace Nette\Utils;
11
12use Nette;
13use function abs, is_finite, is_nan, max, round;
14
15
16/**
17 * Floating-point numbers comparison.
18 */
19class Floats
20{
21 use Nette\StaticClass;
22
23 private const Epsilon = 1e-10;
24
25
26 public static function isZero(float $value): bool
27 {
28 return abs($value) < self::Epsilon;
29 }
30
31
32 public static function isInteger(float $value): bool
33 {
34 return abs(round($value) - $value) < self::Epsilon;
35 }
36
37
38 /**
39 * Compare two floats. If $a < $b it returns -1, if they are equal it returns 0 and if $a > $b it returns 1
40 * @throws \LogicException if one of parameters is NAN
41 */
42 public static function compare(float $a, float $b): int
43 {
44 if (is_nan($a) || is_nan($b)) {
45 throw new \LogicException('Trying to compare NAN');
46
47 } elseif (!is_finite($a) && !is_finite($b) && $a === $b) {
48 return 0;
49 }
50
51 $diff = abs($a - $b);
52 if (($diff < self::Epsilon || ($diff / max(abs($a), abs($b)) < self::Epsilon))) {
53 return 0;
54 }
55
56 return $a < $b ? -1 : 1;
57 }
58
59
60 /**
61 * Returns true if $a = $b
62 * @throws \LogicException if one of parameters is NAN
63 */
64 public static function areEqual(float $a, float $b): bool
65 {
66 return self::compare($a, $b) === 0;
67 }
68
69
70 /**
71 * Returns true if $a < $b
72 * @throws \LogicException if one of parameters is NAN
73 */
74 public static function isLessThan(float $a, float $b): bool
75 {
76 return self::compare($a, $b) < 0;
77 }
78
79
80 /**
81 * Returns true if $a <= $b
82 * @throws \LogicException if one of parameters is NAN
83 */
84 public static function isLessThanOrEqualTo(float $a, float $b): bool
85 {
86 return self::compare($a, $b) <= 0;
87 }
88
89
90 /**
91 * Returns true if $a > $b
92 * @throws \LogicException if one of parameters is NAN
93 */
94 public static function isGreaterThan(float $a, float $b): bool
95 {
96 return self::compare($a, $b) > 0;
97 }
98
99
100 /**
101 * Returns true if $a >= $b
102 * @throws \LogicException if one of parameters is NAN
103 */
104 public static function isGreaterThanOrEqualTo(float $a, float $b): bool
105 {
106 return self::compare($a, $b) >= 0;
107 }
108}