|
1
|
|
|
<?php declare(strict_types=1); |
|
2
|
|
|
namespace Kepawni\Twilted\Basic; |
|
3
|
|
|
|
|
4
|
|
|
use InvalidArgumentException; |
|
5
|
|
|
use Kepawni\Twilted\Equatable; |
|
6
|
|
|
use RuntimeException; |
|
7
|
|
|
|
|
8
|
|
|
/** |
|
9
|
|
|
* Subclasses (which should be final) are immutable and their properties are externally available through magic getters |
|
10
|
|
|
* and internally through a protected init method. For each of the properties there is a public method “with...($value)” |
|
11
|
|
|
* that returns a deep copy of the instance which differs in that property being set to the new value. It is recommended |
|
12
|
|
|
* to use the documentation tags @property-read and @method to help IDEs providing intellisense capabilities anyway. |
|
13
|
|
|
* |
|
14
|
|
|
* CAUTION: The following example contains Zero-Width Space characters before / and after @ to prevent interpretation of |
|
15
|
|
|
* doctags and premature comment ending. For a more comfortable copy-and-paste experience this source code can be found |
|
16
|
|
|
* at the bottom of the file without those extra ZWS characters. |
|
17
|
|
|
* |
|
18
|
|
|
* Example: |
|
19
|
|
|
* |
|
20
|
|
|
* /** |
|
21
|
|
|
* * @property-read int $red |
|
22
|
|
|
* * @property-read int $green |
|
23
|
|
|
* * @property-read int $blue |
|
24
|
|
|
* * @method self withRed(int $v) |
|
25
|
|
|
* * @method self withGreen(int $v) |
|
26
|
|
|
* * @method self withBlue(int $v) |
|
27
|
|
|
* */ |
|
28
|
|
|
* final class Color extends ImmutableValue |
|
29
|
|
|
* { |
|
30
|
|
|
* public function __construct(int $red, int $green, int $blue) |
|
31
|
|
|
* { |
|
32
|
|
|
* $this->init('red', $red); |
|
33
|
|
|
* $this->init('green', $green); |
|
34
|
|
|
* $this->init('blue', $blue); |
|
35
|
|
|
* } |
|
36
|
|
|
* } |
|
37
|
|
|
*/ |
|
38
|
|
|
abstract class ImmutableValue implements Equatable |
|
39
|
|
|
{ |
|
40
|
|
|
private $data = []; |
|
41
|
|
|
|
|
42
|
|
|
private static function areArraysAndEqual($a, $b): bool |
|
43
|
|
|
{ |
|
44
|
|
|
return self::areArraysAndSameSized($a, $b) && count($a) === self::countEqualValuesInArrays($a, $b); |
|
45
|
|
|
} |
|
46
|
|
|
|
|
47
|
|
|
private static function areArraysAndSameSized($a, $b): bool |
|
48
|
|
|
{ |
|
49
|
|
|
return is_array($a) && is_array($b) && count($a) === count($b); |
|
50
|
|
|
} |
|
51
|
|
|
|
|
52
|
|
|
private static function areInstancesAndEqual($a, $b): bool |
|
53
|
|
|
{ |
|
54
|
|
|
return $a instanceof self && $a->equals($b); |
|
55
|
|
|
} |
|
56
|
|
|
|
|
57
|
|
|
private static function cloneArray($value): array |
|
58
|
|
|
{ |
|
59
|
|
|
return array_map([self::class, 'cloneValue'], $value); |
|
60
|
|
|
} |
|
61
|
|
|
|
|
62
|
|
|
private static function cloneIfObject($value) |
|
63
|
|
|
{ |
|
64
|
|
|
return is_object($value) ? clone $value : $value; |
|
65
|
|
|
} |
|
66
|
|
|
|
|
67
|
|
|
private static function cloneValue($value) |
|
68
|
|
|
{ |
|
69
|
|
|
return is_array($value) ? self::cloneArray($value) : self::cloneIfObject($value); |
|
70
|
|
|
} |
|
71
|
|
|
|
|
72
|
|
|
private static function countEqualValuesInArrays($a, $b): int |
|
73
|
|
|
{ |
|
74
|
|
|
return count(array_filter(array_map([self::class, 'isEqual'], $a, $b))); |
|
75
|
|
|
} |
|
76
|
|
|
|
|
77
|
|
|
private static function isEqual($a, $b): bool |
|
78
|
|
|
{ |
|
79
|
|
|
return $a === $b || self::areArraysAndEqual($a, $b) || self::areInstancesAndEqual($a, $b); |
|
80
|
|
|
} |
|
81
|
|
|
|
|
82
|
|
|
/** |
|
83
|
|
|
* @param string $name |
|
84
|
|
|
* @param array $arguments |
|
85
|
|
|
* |
|
86
|
|
|
* @return ImmutableValue |
|
87
|
|
|
* @throws RuntimeException |
|
88
|
|
|
*/ |
|
89
|
|
|
public function __call(string $name, array $arguments) |
|
90
|
|
|
{ |
|
91
|
|
|
if (strlen($name) > 4 && substr($name, 0, 4) === 'with' && count($arguments) === 1) { |
|
92
|
|
|
$memberName = array_key_exists(strtolower($name[4]) . substr($name, 5), $this->data) |
|
93
|
|
|
? strtolower($name[4]) . substr($name, 5) |
|
94
|
|
|
: substr($name, 4); |
|
95
|
|
|
if (array_key_exists($memberName, $this->data)) { |
|
96
|
|
|
$value = self::cloneValue($arguments[0]); |
|
97
|
|
|
$result = clone $this; |
|
98
|
|
|
$result->data[$memberName] = $value; |
|
99
|
|
|
return $result; |
|
100
|
|
|
} |
|
101
|
|
|
} |
|
102
|
|
|
$json = json_encode($arguments); |
|
103
|
|
|
throw new RuntimeException( |
|
104
|
|
|
'Cannot evaluate (' . get_class($this) . ')->' . $name . '(' . substr($json, 1, -1) . ')' |
|
105
|
|
|
); |
|
106
|
|
|
} |
|
107
|
|
|
|
|
108
|
|
|
public function __clone() |
|
109
|
|
|
{ |
|
110
|
|
|
$this->data = self::cloneValue($this->data); |
|
111
|
|
|
} |
|
112
|
|
|
|
|
113
|
|
|
/** |
|
114
|
|
|
* @param string $name |
|
115
|
|
|
* |
|
116
|
|
|
* @return mixed |
|
117
|
|
|
* @throws RuntimeException |
|
118
|
|
|
*/ |
|
119
|
|
|
public function __get(string $name) |
|
120
|
|
|
{ |
|
121
|
|
|
if (array_key_exists($name, $this->data)) { |
|
122
|
|
|
return $this->data[$name]; |
|
123
|
|
|
} |
|
124
|
|
|
throw new RuntimeException('Cannot access (' . get_class($this) . ')->$' . $name); |
|
125
|
|
|
} |
|
126
|
|
|
|
|
127
|
|
|
/** |
|
128
|
|
|
* Checks whether this instance is equal to the given value. |
|
129
|
|
|
* |
|
130
|
|
|
* @param $other |
|
131
|
|
|
* |
|
132
|
|
|
* @return bool |
|
133
|
|
|
*/ |
|
134
|
|
|
public function equals($other): bool |
|
135
|
|
|
{ |
|
136
|
|
|
return $other instanceof static && self::isEqual(get_object_vars($this), get_object_vars($other)); |
|
137
|
|
|
} |
|
138
|
|
|
|
|
139
|
|
|
/** |
|
140
|
|
|
* @param string $name |
|
141
|
|
|
* @param mixed $value |
|
142
|
|
|
* |
|
143
|
|
|
* @throws InvalidArgumentException |
|
144
|
|
|
*/ |
|
145
|
|
|
protected function init(string $name, $value): void |
|
146
|
|
|
{ |
|
147
|
|
|
if (array_key_exists($name, $this->data)) { |
|
148
|
|
|
throw new InvalidArgumentException( |
|
149
|
|
|
sprintf('Property %s of %s cannot be re-initialized', $name, get_class($this)) |
|
150
|
|
|
); |
|
151
|
|
|
} |
|
152
|
|
|
$this->data[$name] = self::cloneValue($value); |
|
153
|
|
|
} |
|
154
|
|
|
} |
|
155
|
|
|
|
|
156
|
|
|
__halt_compiler(); |
|
157
|
|
|
/** |
|
158
|
|
|
* @property-read int $red |
|
159
|
|
|
* @property-read int $green |
|
160
|
|
|
* @property-read int $blue |
|
161
|
|
|
* @method self withRed(int $v) |
|
162
|
|
|
* @method self withGreen(int $v) |
|
163
|
|
|
* @method self withBlue(int $v) |
|
164
|
|
|
*/ |
|
165
|
|
|
final class Color extends ImmutableValue |
|
166
|
|
|
{ |
|
167
|
|
|
public function __construct(int $red, int $green, int $blue) |
|
168
|
|
|
{ |
|
169
|
|
|
$this->init('red', $red); |
|
170
|
|
|
$this->init('green', $green); |
|
171
|
|
|
$this->init('blue', $blue); |
|
172
|
|
|
} |
|
173
|
|
|
} |
|
174
|
|
|
|