marc-mabe /
php-enum
| Total Complexity | 49 |
| Total Lines | 418 |
| Duplicated Lines | 0 % |
| Coverage | 100% |
| Changes | 9 | ||
| Bugs | 1 | Features | 0 |
Complex classes like Enum often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Enum, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 18 | abstract class Enum |
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| 19 | { |
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| 20 | /** |
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| 21 | * The selected enumerator value |
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| 22 | * |
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| 23 | * @var null|bool|int|float|string|array<int|string, mixed> |
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| 24 | */ |
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| 25 | private $value; |
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Coding Style
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| 26 | |||
| 27 | /** |
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| 28 | * The ordinal number of the enumerator |
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| 29 | * |
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| 30 | * @var null|int |
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| 31 | */ |
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| 32 | private $ordinal; |
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| 33 | |||
| 34 | /** |
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| 35 | * A map of enumerator names and values by enumeration class |
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| 36 | * |
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| 37 | * @var array<class-string<Enum>, array<string, null|bool|int|float|string|array<int|string, mixed>>> |
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| 38 | */ |
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| 39 | private static $constants = []; |
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| 40 | |||
| 41 | /** |
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| 42 | * A List of available enumerator names by enumeration class |
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| 43 | * |
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| 44 | * @var array<class-string<Enum>, string[]> |
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| 45 | */ |
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| 46 | private static $names = []; |
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| 47 | |||
| 48 | /** |
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| 49 | * A map of enumerator names and instances by enumeration class |
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| 50 | * |
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| 51 | * @var array<class-string<Enum>, array<string, Enum>> |
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| 52 | */ |
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| 53 | private static $instances = []; |
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| 54 | |||
| 55 | /** |
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| 56 | * Constructor |
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| 57 | * |
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| 58 | * @param null|bool|int|float|string|array<int|string, mixed> $value The value of the enumerator |
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| 59 | * @param int|null $ordinal The ordinal number of the enumerator |
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| 60 | */ |
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| 61 | 45 | final private function __construct($value, $ordinal = null) |
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| 62 | { |
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| 63 | 45 | $this->value = $value; |
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| 64 | 45 | $this->ordinal = $ordinal; |
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| 65 | 45 | } |
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| 66 | |||
| 67 | /** |
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| 68 | * Get the name of the enumerator |
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| 69 | * |
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| 70 | * @return string |
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| 71 | * @see getName() |
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| 72 | */ |
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| 73 | 1 | public function __toString(): string |
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| 76 | } |
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| 77 | |||
| 78 | /** |
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| 79 | * @throws LogicException Enums are not cloneable |
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| 80 | * because instances are implemented as singletons |
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| 81 | */ |
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| 82 | 1 | final private function __clone() |
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| 83 | { |
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| 84 | 1 | throw new LogicException('Enums are not cloneable'); |
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| 85 | } |
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| 86 | |||
| 87 | /** |
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| 88 | * @throws LogicException Enums are not serializable |
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| 89 | * because instances are implemented as singletons |
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| 90 | */ |
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| 91 | 1 | final public function __sleep() |
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| 94 | } |
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| 95 | |||
| 96 | /** |
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| 97 | * @throws LogicException Enums are not serializable |
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| 98 | * because instances are implemented as singletons |
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| 99 | */ |
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| 100 | 1 | final public function __wakeup() |
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| 101 | { |
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| 102 | 1 | throw new LogicException('Enums are not serializable'); |
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| 103 | } |
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| 104 | |||
| 105 | /** |
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| 106 | * Get the value of the enumerator |
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| 107 | * |
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| 108 | * @return null|bool|int|float|string|array<int|string, mixed> |
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| 109 | */ |
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| 110 | 32 | final public function getValue() |
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| 113 | } |
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| 114 | |||
| 115 | /** |
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| 116 | * Get the name of the enumerator |
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| 117 | * |
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| 118 | * @return string |
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| 119 | */ |
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| 120 | 8 | final public function getName() |
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| 123 | } |
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| 124 | |||
| 125 | /** |
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| 126 | * Get the ordinal number of the enumerator |
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| 127 | * |
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| 128 | * @return int |
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| 129 | */ |
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| 130 | 109 | final public function getOrdinal() |
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| 131 | { |
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| 132 | 109 | if ($this->ordinal === null) { |
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| 133 | 22 | $ordinal = 0; |
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| 134 | 22 | $value = $this->value; |
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| 135 | 22 | $constants = self::$constants[static::class] ?? static::getConstants(); |
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| 136 | 22 | foreach ($constants as $constValue) { |
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| 137 | 22 | if ($value === $constValue) { |
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| 138 | 22 | break; |
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| 139 | } |
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| 140 | 17 | ++$ordinal; |
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| 141 | } |
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| 142 | |||
| 143 | 22 | $this->ordinal = $ordinal; |
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| 144 | } |
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| 145 | |||
| 146 | 109 | return $this->ordinal; |
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| 147 | } |
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| 148 | |||
| 149 | /** |
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| 150 | * Compare this enumerator against another and check if it's the same. |
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| 151 | * |
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| 152 | * @param static|null|bool|int|float|string|array<int|string, mixed> $enumerator An enumerator object or value |
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| 153 | * @return bool |
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| 154 | */ |
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| 155 | 2 | final public function is($enumerator) |
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| 163 | ); |
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| 164 | } |
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| 165 | |||
| 166 | /** |
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| 167 | * Get an enumerator instance of the given enumerator value or instance |
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| 168 | * |
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| 169 | * @param static|null|bool|int|float|string|array<int|string, mixed> $enumerator An enumerator object or value |
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| 170 | * @return static |
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| 171 | * @throws InvalidArgumentException On an unknown or invalid value |
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| 172 | * @throws LogicException On ambiguous constant values |
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| 173 | */ |
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| 174 | 120 | final public static function get($enumerator) |
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| 175 | { |
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| 176 | 120 | if ($enumerator instanceof static) { |
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| 177 | 39 | if (\get_class($enumerator) !== static::class) { |
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| 178 | 4 | throw new InvalidArgumentException(sprintf( |
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| 179 | 4 | 'Invalid value of type %s for enumeration %s', |
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| 180 | 4 | \get_class($enumerator), |
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| 181 | 4 | static::class |
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| 182 | )); |
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| 183 | } |
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| 184 | |||
| 185 | 35 | return $enumerator; |
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| 186 | } |
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| 187 | |||
| 188 | 93 | return static::byValue($enumerator); |
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| 189 | } |
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| 190 | |||
| 191 | /** |
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| 192 | * Get an enumerator instance by the given value |
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| 193 | * |
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| 194 | * @param null|bool|int|float|string|array<int|string, mixed> $value Enumerator value |
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| 195 | * @return static |
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| 196 | * @throws InvalidArgumentException On an unknown or invalid value |
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| 197 | * @throws LogicException On ambiguous constant values |
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| 198 | */ |
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| 199 | 93 | final public static function byValue($value) |
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| 221 | } |
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| 222 | |||
| 223 | /** |
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| 224 | * Get an enumerator instance by the given name |
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| 225 | * |
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| 226 | * @param string $name The name of the enumerator |
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| 227 | * @return static |
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| 228 | * @throws InvalidArgumentException On an invalid or unknown name |
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| 229 | * @throws LogicException On ambiguous values |
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| 230 | */ |
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| 231 | 59 | final public static function byName(string $name) |
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| 232 | { |
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| 233 | 59 | if (isset(self::$instances[static::class][$name])) { |
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| 234 | /** @var static $instance */ |
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| 235 | 44 | $instance = self::$instances[static::class][$name]; |
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| 236 | 44 | return $instance; |
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| 237 | } |
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| 238 | |||
| 239 | 19 | $const = static::class . "::{$name}"; |
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| 240 | 19 | if (!\defined($const)) { |
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| 241 | 1 | throw new InvalidArgumentException("{$const} not defined"); |
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| 242 | } |
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| 243 | |||
| 244 | 18 | assert( |
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| 245 | 18 | self::noAmbiguousValues(static::getConstants()), |
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| 246 | 17 | 'Ambiguous enumerator values detected for ' . static::class |
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| 247 | ); |
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| 248 | |||
| 249 | 17 | return self::$instances[static::class][$name] = new static(\constant($const)); |
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| 250 | } |
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| 251 | |||
| 252 | /** |
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| 253 | * Get an enumeration instance by the given ordinal number |
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| 254 | * |
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| 255 | * @param int $ordinal The ordinal number of the enumerator |
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| 256 | * @return static |
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| 257 | * @throws InvalidArgumentException On an invalid ordinal number |
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| 258 | * @throws LogicException On ambiguous values |
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| 259 | */ |
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| 260 | 39 | final public static function byOrdinal(int $ordinal) |
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| 279 | } |
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| 280 | |||
| 281 | /** |
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| 282 | * Get a list of enumerator instances ordered by ordinal number |
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| 283 | * |
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| 284 | * @return static[] |
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| 285 | */ |
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| 286 | 17 | final public static function getEnumerators() |
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| 287 | { |
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| 288 | 17 | if (!isset(self::$names[static::class])) { |
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| 289 | 1 | static::getConstants(); |
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| 290 | } |
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| 291 | |||
| 292 | /** @var callable $byNameFn */ |
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| 293 | 17 | $byNameFn = [static::class, 'byName']; |
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| 294 | 17 | return \array_map($byNameFn, self::$names[static::class]); |
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| 295 | } |
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| 296 | |||
| 297 | /** |
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| 298 | * Get a list of enumerator values ordered by ordinal number |
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| 299 | * |
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| 300 | * @return (null|bool|int|float|string|array<int|string, mixed>)[] |
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| 301 | */ |
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| 302 | 7 | final public static function getValues() |
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| 303 | { |
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| 304 | 7 | return \array_values(self::$constants[static::class] ?? static::getConstants()); |
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| 305 | } |
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| 306 | |||
| 307 | /** |
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| 308 | * Get a list of enumerator names ordered by ordinal number |
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| 309 | * |
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| 310 | * @return string[] |
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| 311 | */ |
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| 312 | 3 | final public static function getNames() |
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| 313 | { |
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| 314 | 3 | if (!isset(self::$names[static::class])) { |
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| 315 | 1 | static::getConstants(); |
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| 316 | } |
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| 317 | 3 | return self::$names[static::class]; |
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| 318 | } |
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| 319 | |||
| 320 | /** |
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| 321 | * Get a list of enumerator ordinal numbers |
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| 322 | * |
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| 323 | * @return int[] |
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| 324 | */ |
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| 325 | 1 | final public static function getOrdinals() |
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| 326 | { |
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| 327 | 1 | $count = \count(self::$constants[static::class] ?? static::getConstants()); |
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| 328 | 1 | return $count ? \range(0, $count - 1) : []; |
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| 329 | } |
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| 330 | |||
| 331 | /** |
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| 332 | * Get all available constants of the called class |
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| 333 | * |
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| 334 | * @return array<string, null|bool|int|float|string|array<int|string, mixed>> |
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| 335 | * @throws LogicException On ambiguous constant values |
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| 336 | */ |
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| 337 | 152 | final public static function getConstants() |
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| 338 | { |
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| 339 | 152 | if (isset(self::$constants[static::class])) { |
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| 340 | 116 | return self::$constants[static::class]; |
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| 341 | } |
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| 342 | |||
| 343 | 51 | $reflection = new ReflectionClass(static::class); |
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| 344 | 51 | $constants = []; |
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| 345 | |||
| 346 | do { |
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| 347 | 51 | $scopeConstants = []; |
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| 348 | // Enumerators must be defined as public class constants |
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| 349 | 51 | foreach ($reflection->getReflectionConstants() as $reflConstant) { |
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| 350 | 50 | if ($reflConstant->isPublic()) { |
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| 351 | 50 | $scopeConstants[ $reflConstant->getName() ] = $reflConstant->getValue(); |
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| 352 | } |
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| 353 | } |
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| 354 | |||
| 355 | 51 | $constants = $scopeConstants + $constants; |
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| 356 | 51 | } while (($reflection = $reflection->getParentClass()) && $reflection->name !== __CLASS__); |
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| 357 | |||
| 358 | 51 | assert( |
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| 359 | 51 | self::noAmbiguousValues($constants), |
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| 360 | 51 | 'Ambiguous enumerator values detected for ' . static::class |
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| 361 | ); |
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| 362 | |||
| 363 | 48 | self::$names[static::class] = \array_keys($constants); |
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| 364 | 48 | return self::$constants[static::class] = $constants; |
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| 365 | } |
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| 366 | |||
| 367 | /** |
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| 368 | * Test that the given constants does not contain ambiguous values |
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| 369 | * @param array<string, null|bool|int|float|string|array<int|string, mixed>> $constants |
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| 370 | * @return bool |
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| 371 | */ |
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| 372 | 53 | private static function noAmbiguousValues($constants) |
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| 373 | { |
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| 374 | 53 | foreach ($constants as $value) { |
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| 375 | 52 | $names = \array_keys($constants, $value, true); |
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| 376 | 52 | if (\count($names) > 1) { |
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| 377 | 52 | return false; |
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| 378 | } |
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| 379 | } |
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| 380 | |||
| 381 | 48 | return true; |
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| 382 | } |
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| 383 | |||
| 384 | /** |
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| 385 | * Test if the given enumerator is part of this enumeration |
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| 386 | * |
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| 387 | * @param static|null|bool|int|float|string|array<int|string, mixed> $enumerator |
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| 388 | * @return bool |
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| 389 | */ |
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| 390 | 1 | final public static function has($enumerator) |
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| 391 | { |
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| 392 | 1 | if ($enumerator instanceof static) { |
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| 393 | 1 | return \get_class($enumerator) === static::class; |
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| 394 | } |
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| 395 | |||
| 396 | 1 | return static::hasValue($enumerator); |
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| 397 | } |
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| 398 | |||
| 399 | /** |
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| 400 | * Test if the given enumerator value is part of this enumeration |
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| 401 | * |
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| 402 | * @param null|bool|int|float|string|array<int|string, mixed> $value |
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| 403 | * @return bool |
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| 404 | */ |
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| 405 | 2 | final public static function hasValue($value) |
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| 406 | { |
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| 407 | 2 | return \in_array($value, self::$constants[static::class] ?? static::getConstants(), true); |
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| 408 | } |
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| 409 | |||
| 410 | /** |
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| 411 | * Test if the given enumerator name is part of this enumeration |
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| 412 | * |
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| 413 | * @param string $name |
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| 414 | * @return bool |
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| 415 | */ |
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| 416 | 1 | final public static function hasName(string $name) |
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| 419 | } |
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| 420 | |||
| 421 | /** |
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| 422 | * Get an enumerator instance by the given name. |
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| 423 | * |
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| 424 | * This will be called automatically on calling a method |
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| 425 | * with the same name of a defined enumerator. |
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| 426 | * |
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| 427 | * @param string $method The name of the enumerator (called as method) |
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| 428 | * @param array<mixed> $args There should be no arguments |
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| 429 | * @return static |
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| 430 | * @throws InvalidArgumentException On an invalid or unknown name |
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| 431 | * @throws LogicException On ambiguous constant values |
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| 432 | */ |
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| 433 | 39 | final public static function __callStatic(string $method, array $args) |
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| 436 | } |
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| 437 | } |
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| 438 |
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