|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace Riimu\Kit\PHPEncoder\Encoder; |
|
4
|
|
|
|
|
5
|
|
|
/** |
|
6
|
|
|
* Encoder for float values. |
|
7
|
|
|
* @author Riikka Kalliomäki <[email protected]> |
|
8
|
|
|
* @copyright Copyright (c) 2014-2020 Riikka Kalliomäki |
|
9
|
|
|
* @license http://opensource.org/licenses/mit-license.php MIT License |
|
10
|
|
|
*/ |
|
11
|
|
|
class FloatEncoder implements Encoder |
|
12
|
|
|
{ |
|
13
|
|
|
/** The maximum value that can be accurately represented by a float */ |
|
14
|
|
|
const FLOAT_MAX = 9007199254740992.0; |
|
15
|
|
|
|
|
16
|
|
|
/** @var array Default values for options in the encoder */ |
|
17
|
|
|
private static $defaultOptions = [ |
|
18
|
|
|
'float.integers' => false, |
|
19
|
|
|
'float.precision' => 17, |
|
20
|
|
|
'float.export' => false, |
|
21
|
|
|
]; |
|
22
|
|
|
|
|
23
|
|
|
public function getDefaultOptions() |
|
24
|
|
|
{ |
|
25
|
|
|
return self::$defaultOptions; |
|
26
|
|
|
} |
|
27
|
|
|
|
|
28
|
|
|
public function supports($value) |
|
29
|
|
|
{ |
|
30
|
|
|
return \is_float($value); |
|
31
|
|
|
} |
|
32
|
|
|
|
|
33
|
|
|
public function encode($value, $depth, array $options, callable $encode) |
|
34
|
|
|
{ |
|
35
|
|
|
if (is_nan($value)) { |
|
36
|
|
|
return 'NAN'; |
|
37
|
|
|
} elseif (is_infinite($value)) { |
|
38
|
|
|
return $value < 0 ? '-INF' : 'INF'; |
|
39
|
|
|
} |
|
40
|
|
|
|
|
41
|
|
|
return $this->encodeNumber($value, $options, $encode); |
|
42
|
|
|
} |
|
43
|
|
|
|
|
44
|
|
|
/** |
|
45
|
|
|
* Encodes the number as a PHP number representation. |
|
46
|
|
|
* @param float $float The number to encode |
|
47
|
|
|
* @param array $options The float encoding options |
|
48
|
|
|
* @param callable $encode Callback used to encode values |
|
49
|
|
|
* @return string The PHP code representation for the number |
|
50
|
|
|
*/ |
|
51
|
|
|
private function encodeNumber($float, array $options, callable $encode) |
|
52
|
|
|
{ |
|
53
|
|
|
if ($this->isInteger($float, $options['float.integers'])) { |
|
54
|
|
|
return $this->encodeInteger($float, $encode); |
|
55
|
|
|
} elseif ($float === 0.0) { |
|
|
|
|
|
|
56
|
|
|
return '0.0'; |
|
57
|
|
|
} elseif ($options['float.export']) { |
|
58
|
|
|
return var_export((float) $float, true); |
|
59
|
|
|
} |
|
60
|
|
|
|
|
61
|
|
|
return $this->encodeFloat($float, $this->determinePrecision($options)); |
|
62
|
|
|
} |
|
63
|
|
|
|
|
64
|
|
|
/** |
|
65
|
|
|
* Tells if the number can be encoded as an integer. |
|
66
|
|
|
* @param float $float The number to test |
|
67
|
|
|
* @param bool|string $allowIntegers Whether integers should be allowed |
|
68
|
|
|
* @return bool True if the number can be encoded as an integer, false if not |
|
69
|
|
|
*/ |
|
70
|
|
|
private function isInteger($float, $allowIntegers) |
|
71
|
|
|
{ |
|
72
|
|
|
if (!$allowIntegers || round($float) !== $float) { |
|
73
|
|
|
return false; |
|
74
|
|
|
} elseif (abs($float) < self::FLOAT_MAX) { |
|
75
|
|
|
return true; |
|
76
|
|
|
} |
|
77
|
|
|
|
|
78
|
|
|
return $allowIntegers === 'all'; |
|
79
|
|
|
} |
|
80
|
|
|
|
|
81
|
|
|
/** |
|
82
|
|
|
* Encodes the given float as an integer. |
|
83
|
|
|
* @param float $float The number to encode |
|
84
|
|
|
* @param callable $encode Callback used to encode values |
|
85
|
|
|
* @return string The PHP code representation for the number |
|
86
|
|
|
*/ |
|
87
|
|
|
private function encodeInteger($float, callable $encode) |
|
88
|
|
|
{ |
|
89
|
|
|
$minimum = \defined('PHP_INT_MIN') ? \PHP_INT_MIN : ~\PHP_INT_MAX; |
|
90
|
|
|
|
|
91
|
|
|
if ($float >= $minimum && $float <= \PHP_INT_MAX) { |
|
92
|
|
|
return $encode((int) $float); |
|
93
|
|
|
} |
|
94
|
|
|
|
|
95
|
|
|
return number_format($float, 0, '.', ''); |
|
96
|
|
|
} |
|
97
|
|
|
|
|
98
|
|
|
/** |
|
99
|
|
|
* Determines the float precision based on the options. |
|
100
|
|
|
* @param array $options The float encoding options |
|
101
|
|
|
* @return int The precision used to encode floats |
|
102
|
|
|
*/ |
|
103
|
|
|
private function determinePrecision($options) |
|
104
|
|
|
{ |
|
105
|
|
|
$precision = $options['float.precision']; |
|
106
|
|
|
|
|
107
|
|
|
if ($precision === false) { |
|
108
|
|
|
$precision = ini_get('serialize_precision'); |
|
109
|
|
|
} |
|
110
|
|
|
|
|
111
|
|
|
return max(1, (int) $precision); |
|
112
|
|
|
} |
|
113
|
|
|
|
|
114
|
|
|
/** |
|
115
|
|
|
* Encodes the number using a floating point representation. |
|
116
|
|
|
* @param float $float The number to encode |
|
117
|
|
|
* @param int $precision The maximum precision of encoded floats |
|
118
|
|
|
* @return string The PHP code representation for the number |
|
119
|
|
|
*/ |
|
120
|
|
|
private function encodeFloat($float, $precision) |
|
121
|
|
|
{ |
|
122
|
|
|
$log = (int) floor(log(abs($float), 10)); |
|
123
|
|
|
|
|
124
|
|
|
if ($log > -5 && abs($float) < self::FLOAT_MAX && abs($log) < $precision) { |
|
125
|
|
|
return $this->formatFloat($float, $precision - $log - 1); |
|
126
|
|
|
} |
|
127
|
|
|
|
|
128
|
|
|
// Deal with overflow that results from rounding |
|
129
|
|
|
$log += (int) (round(abs($float) / 10 ** $log, $precision - 1) / 10); |
|
130
|
|
|
$string = $this->formatFloat($float / 10 ** $log, $precision - 1); |
|
131
|
|
|
|
|
132
|
|
|
return sprintf('%sE%+d', $string, $log); |
|
133
|
|
|
} |
|
134
|
|
|
|
|
135
|
|
|
/** |
|
136
|
|
|
* Formats the number as a decimal number. |
|
137
|
|
|
* @param float $float The number to format |
|
138
|
|
|
* @param int $digits The maximum number of decimal digits |
|
139
|
|
|
* @return string The number formatted as a decimal number |
|
140
|
|
|
*/ |
|
141
|
|
|
private function formatFloat($float, $digits) |
|
142
|
|
|
{ |
|
143
|
|
|
$digits = max((int) $digits, 1); |
|
144
|
|
|
$string = rtrim(number_format($float, $digits, '.', ''), '0'); |
|
145
|
|
|
|
|
146
|
|
|
return substr($string, -1) === '.' ? $string . '0' : $string; |
|
147
|
|
|
} |
|
148
|
|
|
} |
|
149
|
|
|
|
Riimu /
Kit-PHPEncoder
Loading history...